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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
4 file Documentation/scsi/st.rst for more information.
5
6 History:
7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
8 Contribution and ideas from several people including (in alphabetical
9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
11 Michael Schaefer, J"org Weule, and Eric Youngdale.
12
13 Copyright 1992 - 2016 Kai Makisara
14 email Kai.Makisara@kolumbus.fi
15
16 Some small formal changes - aeb, 950809
17
18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
19 */
20
21static const char *verstr = "20160209";
22
23#include <linux/module.h>
24
25#include <linux/compat.h>
26#include <linux/fs.h>
27#include <linux/kernel.h>
28#include <linux/sched/signal.h>
29#include <linux/mm.h>
30#include <linux/init.h>
31#include <linux/string.h>
32#include <linux/slab.h>
33#include <linux/errno.h>
34#include <linux/mtio.h>
35#include <linux/cdrom.h>
36#include <linux/ioctl.h>
37#include <linux/fcntl.h>
38#include <linux/spinlock.h>
39#include <linux/blkdev.h>
40#include <linux/moduleparam.h>
41#include <linux/cdev.h>
42#include <linux/idr.h>
43#include <linux/delay.h>
44#include <linux/mutex.h>
45
46#include <linux/uaccess.h>
47#include <asm/dma.h>
48#include <asm/unaligned.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_dbg.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_driver.h>
54#include <scsi/scsi_eh.h>
55#include <scsi/scsi_host.h>
56#include <scsi/scsi_ioctl.h>
57#include <scsi/sg.h>
58
59
60/* The driver prints some debugging information on the console if DEBUG
61 is defined and non-zero. */
62#define DEBUG 1
63#define NO_DEBUG 0
64
65#define ST_DEB_MSG KERN_NOTICE
66#if DEBUG
67/* The message level for the debug messages is currently set to KERN_NOTICE
68 so that people can easily see the messages. Later when the debugging messages
69 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
70#define DEB(a) a
71#define DEBC(a) if (debugging) { a ; }
72#else
73#define DEB(a)
74#define DEBC(a)
75#endif
76
77#define ST_KILOBYTE 1024
78
79#include "st_options.h"
80#include "st.h"
81
82static int buffer_kbs;
83static int max_sg_segs;
84static int try_direct_io = TRY_DIRECT_IO;
85static int try_rdio = 1;
86static int try_wdio = 1;
87static int debug_flag;
88
89static struct class st_sysfs_class;
90static const struct attribute_group *st_dev_groups[];
91static const struct attribute_group *st_drv_groups[];
92
93MODULE_AUTHOR("Kai Makisara");
94MODULE_DESCRIPTION("SCSI tape (st) driver");
95MODULE_LICENSE("GPL");
96MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
97MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
98
99/* Set 'perm' (4th argument) to 0 to disable module_param's definition
100 * of sysfs parameters (which module_param doesn't yet support).
101 * Sysfs parameters defined explicitly later.
102 */
103module_param_named(buffer_kbs, buffer_kbs, int, 0);
104MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
105module_param_named(max_sg_segs, max_sg_segs, int, 0);
106MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
107module_param_named(try_direct_io, try_direct_io, int, 0);
108MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
109module_param_named(debug_flag, debug_flag, int, 0);
110MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
111
112
113/* Extra parameters for testing */
114module_param_named(try_rdio, try_rdio, int, 0);
115MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
116module_param_named(try_wdio, try_wdio, int, 0);
117MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
118
119#ifndef MODULE
120static int write_threshold_kbs; /* retained for compatibility */
121static struct st_dev_parm {
122 char *name;
123 int *val;
124} parms[] __initdata = {
125 {
126 "buffer_kbs", &buffer_kbs
127 },
128 { /* Retained for compatibility with 2.4 */
129 "write_threshold_kbs", &write_threshold_kbs
130 },
131 {
132 "max_sg_segs", NULL
133 },
134 {
135 "try_direct_io", &try_direct_io
136 },
137 {
138 "debug_flag", &debug_flag
139 }
140};
141#endif
142
143/* Restrict the number of modes so that names for all are assigned */
144#if ST_NBR_MODES > 16
145#error "Maximum number of modes is 16"
146#endif
147/* Bit reversed order to get same names for same minors with all
148 mode counts */
149static const char *st_formats[] = {
150 "", "r", "k", "s", "l", "t", "o", "u",
151 "m", "v", "p", "x", "a", "y", "q", "z"};
152
153/* The default definitions have been moved to st_options.h */
154
155#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
156
157/* The buffer size should fit into the 24 bits for length in the
158 6-byte SCSI read and write commands. */
159#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
160#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
161#endif
162
163static int debugging = DEBUG;
164
165#define MAX_RETRIES 0
166#define MAX_WRITE_RETRIES 0
167#define MAX_READY_RETRIES 0
168#define NO_TAPE NOT_READY
169
170#define ST_TIMEOUT (900 * HZ)
171#define ST_LONG_TIMEOUT (14000 * HZ)
172
173/* Remove mode bits and auto-rewind bit (7) */
174#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
175 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
176#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
177
178/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
179#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
180 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
181
182/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
183 24 bits) */
184#define SET_DENS_AND_BLK 0x10001
185
186static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
187static int st_max_sg_segs = ST_MAX_SG;
188
189static int modes_defined;
190
191static int enlarge_buffer(struct st_buffer *, int, int);
192static void clear_buffer(struct st_buffer *);
193static void normalize_buffer(struct st_buffer *);
194static int append_to_buffer(const char __user *, struct st_buffer *, int);
195static int from_buffer(struct st_buffer *, char __user *, int);
196static void move_buffer_data(struct st_buffer *, int);
197
198static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
199 unsigned long, size_t, int);
200static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
201
202static int st_probe(struct device *);
203static int st_remove(struct device *);
204
205static struct scsi_driver st_template = {
206 .gendrv = {
207 .name = "st",
208 .owner = THIS_MODULE,
209 .probe = st_probe,
210 .remove = st_remove,
211 .groups = st_drv_groups,
212 },
213};
214
215static int st_compression(struct scsi_tape *, int);
216
217static int find_partition(struct scsi_tape *);
218static int switch_partition(struct scsi_tape *);
219
220static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
221
222static void scsi_tape_release(struct kref *);
223
224#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
225
226static DEFINE_MUTEX(st_ref_mutex);
227static DEFINE_SPINLOCK(st_index_lock);
228static DEFINE_SPINLOCK(st_use_lock);
229static DEFINE_IDR(st_index_idr);
230
231
232
233#ifndef SIGS_FROM_OSST
234#define SIGS_FROM_OSST \
235 {"OnStream", "SC-", "", "osst"}, \
236 {"OnStream", "DI-", "", "osst"}, \
237 {"OnStream", "DP-", "", "osst"}, \
238 {"OnStream", "USB", "", "osst"}, \
239 {"OnStream", "FW-", "", "osst"}
240#endif
241
242static struct scsi_tape *scsi_tape_get(int dev)
243{
244 struct scsi_tape *STp = NULL;
245
246 mutex_lock(&st_ref_mutex);
247 spin_lock(&st_index_lock);
248
249 STp = idr_find(&st_index_idr, dev);
250 if (!STp) goto out;
251
252 kref_get(&STp->kref);
253
254 if (!STp->device)
255 goto out_put;
256
257 if (scsi_device_get(STp->device))
258 goto out_put;
259
260 goto out;
261
262out_put:
263 kref_put(&STp->kref, scsi_tape_release);
264 STp = NULL;
265out:
266 spin_unlock(&st_index_lock);
267 mutex_unlock(&st_ref_mutex);
268 return STp;
269}
270
271static void scsi_tape_put(struct scsi_tape *STp)
272{
273 struct scsi_device *sdev = STp->device;
274
275 mutex_lock(&st_ref_mutex);
276 kref_put(&STp->kref, scsi_tape_release);
277 scsi_device_put(sdev);
278 mutex_unlock(&st_ref_mutex);
279}
280
281struct st_reject_data {
282 char *vendor;
283 char *model;
284 char *rev;
285 char *driver_hint; /* Name of the correct driver, NULL if unknown */
286};
287
288static struct st_reject_data reject_list[] = {
289 /* {"XXX", "Yy-", "", NULL}, example */
290 SIGS_FROM_OSST,
291 {NULL, }};
292
293/* If the device signature is on the list of incompatible drives, the
294 function returns a pointer to the name of the correct driver (if known) */
295static char * st_incompatible(struct scsi_device* SDp)
296{
297 struct st_reject_data *rp;
298
299 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
300 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
301 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
302 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
303 if (rp->driver_hint)
304 return rp->driver_hint;
305 else
306 return "unknown";
307 }
308 return NULL;
309}
310
311
312static inline char *tape_name(struct scsi_tape *tape)
313{
314 return tape->disk->disk_name;
315}
316
317#define st_printk(prefix, t, fmt, a...) \
318 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
319#ifdef DEBUG
320#define DEBC_printk(t, fmt, a...) \
321 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
322#else
323#define DEBC_printk(t, fmt, a...)
324#endif
325
326static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
327{
328 const u8 *ucp;
329 const u8 *sense = SRpnt->sense;
330
331 s->have_sense = scsi_normalize_sense(SRpnt->sense,
332 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
333 s->flags = 0;
334
335 if (s->have_sense) {
336 s->deferred = 0;
337 s->remainder_valid =
338 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
339 switch (sense[0] & 0x7f) {
340 case 0x71:
341 s->deferred = 1;
342 fallthrough;
343 case 0x70:
344 s->fixed_format = 1;
345 s->flags = sense[2] & 0xe0;
346 break;
347 case 0x73:
348 s->deferred = 1;
349 fallthrough;
350 case 0x72:
351 s->fixed_format = 0;
352 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
353 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
354 break;
355 }
356 }
357}
358
359
360/* Convert the result to success code */
361static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
362{
363 int result = SRpnt->result;
364 u8 scode;
365 DEB(const char *stp;)
366 char *name = tape_name(STp);
367 struct st_cmdstatus *cmdstatp;
368
369 if (!result)
370 return 0;
371
372 cmdstatp = &STp->buffer->cmdstat;
373 st_analyze_sense(SRpnt, cmdstatp);
374
375 if (cmdstatp->have_sense)
376 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
377 else
378 scode = 0;
379
380 DEB(
381 if (debugging) {
382 st_printk(ST_DEB_MSG, STp,
383 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
384 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
385 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
386 if (cmdstatp->have_sense)
387 __scsi_print_sense(STp->device, name,
388 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
389 } ) /* end DEB */
390 if (!debugging) { /* Abnormal conditions for tape */
391 if (!cmdstatp->have_sense)
392 st_printk(KERN_WARNING, STp,
393 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
394 result, driver_byte(result), host_byte(result));
395 else if (cmdstatp->have_sense &&
396 scode != NO_SENSE &&
397 scode != RECOVERED_ERROR &&
398 /* scode != UNIT_ATTENTION && */
399 scode != BLANK_CHECK &&
400 scode != VOLUME_OVERFLOW &&
401 SRpnt->cmd[0] != MODE_SENSE &&
402 SRpnt->cmd[0] != TEST_UNIT_READY) {
403
404 __scsi_print_sense(STp->device, name,
405 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
406 }
407 }
408
409 if (cmdstatp->fixed_format &&
410 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
411 if (STp->cln_sense_value)
412 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
413 STp->cln_sense_mask) == STp->cln_sense_value);
414 else
415 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
416 STp->cln_sense_mask) != 0);
417 }
418 if (cmdstatp->have_sense &&
419 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
420 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
421
422 STp->pos_unknown |= STp->device->was_reset;
423
424 if (cmdstatp->have_sense &&
425 scode == RECOVERED_ERROR
426#if ST_RECOVERED_WRITE_FATAL
427 && SRpnt->cmd[0] != WRITE_6
428 && SRpnt->cmd[0] != WRITE_FILEMARKS
429#endif
430 ) {
431 STp->recover_count++;
432 STp->recover_reg++;
433
434 DEB(
435 if (debugging) {
436 if (SRpnt->cmd[0] == READ_6)
437 stp = "read";
438 else if (SRpnt->cmd[0] == WRITE_6)
439 stp = "write";
440 else
441 stp = "ioctl";
442 st_printk(ST_DEB_MSG, STp,
443 "Recovered %s error (%d).\n",
444 stp, STp->recover_count);
445 } ) /* end DEB */
446
447 if (cmdstatp->flags == 0)
448 return 0;
449 }
450 return (-EIO);
451}
452
453static struct st_request *st_allocate_request(struct scsi_tape *stp)
454{
455 struct st_request *streq;
456
457 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
458 if (streq)
459 streq->stp = stp;
460 else {
461 st_printk(KERN_ERR, stp,
462 "Can't get SCSI request.\n");
463 if (signal_pending(current))
464 stp->buffer->syscall_result = -EINTR;
465 else
466 stp->buffer->syscall_result = -EBUSY;
467 }
468
469 return streq;
470}
471
472static void st_release_request(struct st_request *streq)
473{
474 kfree(streq);
475}
476
477static void st_do_stats(struct scsi_tape *STp, struct request *req)
478{
479 ktime_t now;
480
481 now = ktime_get();
482 if (scsi_req(req)->cmd[0] == WRITE_6) {
483 now = ktime_sub(now, STp->stats->write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
485 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
486 atomic64_inc(&STp->stats->write_cnt);
487 if (scsi_req(req)->result) {
488 atomic64_add(atomic_read(&STp->stats->last_write_size)
489 - STp->buffer->cmdstat.residual,
490 &STp->stats->write_byte_cnt);
491 if (STp->buffer->cmdstat.residual > 0)
492 atomic64_inc(&STp->stats->resid_cnt);
493 } else
494 atomic64_add(atomic_read(&STp->stats->last_write_size),
495 &STp->stats->write_byte_cnt);
496 } else if (scsi_req(req)->cmd[0] == READ_6) {
497 now = ktime_sub(now, STp->stats->read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
499 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
500 atomic64_inc(&STp->stats->read_cnt);
501 if (scsi_req(req)->result) {
502 atomic64_add(atomic_read(&STp->stats->last_read_size)
503 - STp->buffer->cmdstat.residual,
504 &STp->stats->read_byte_cnt);
505 if (STp->buffer->cmdstat.residual > 0)
506 atomic64_inc(&STp->stats->resid_cnt);
507 } else
508 atomic64_add(atomic_read(&STp->stats->last_read_size),
509 &STp->stats->read_byte_cnt);
510 } else {
511 now = ktime_sub(now, STp->stats->other_time);
512 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
513 atomic64_inc(&STp->stats->other_cnt);
514 }
515 atomic64_dec(&STp->stats->in_flight);
516}
517
518static void st_scsi_execute_end(struct request *req, blk_status_t status)
519{
520 struct st_request *SRpnt = req->end_io_data;
521 struct scsi_request *rq = scsi_req(req);
522 struct scsi_tape *STp = SRpnt->stp;
523 struct bio *tmp;
524
525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
526 STp->buffer->cmdstat.residual = rq->resid_len;
527
528 st_do_stats(STp, req);
529
530 tmp = SRpnt->bio;
531 if (rq->sense_len)
532 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
533 if (SRpnt->waiting)
534 complete(SRpnt->waiting);
535
536 blk_rq_unmap_user(tmp);
537 blk_put_request(req);
538}
539
540static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
541 int data_direction, void *buffer, unsigned bufflen,
542 int timeout, int retries)
543{
544 struct request *req;
545 struct scsi_request *rq;
546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
547 int err = 0;
548 struct scsi_tape *STp = SRpnt->stp;
549
550 req = blk_get_request(SRpnt->stp->device->request_queue,
551 data_direction == DMA_TO_DEVICE ?
552 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
553 if (IS_ERR(req))
554 return DRIVER_ERROR << 24;
555 rq = scsi_req(req);
556 req->rq_flags |= RQF_QUIET;
557
558 mdata->null_mapped = 1;
559
560 if (bufflen) {
561 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
562 GFP_KERNEL);
563 if (err) {
564 blk_put_request(req);
565 return DRIVER_ERROR << 24;
566 }
567 }
568
569 atomic64_inc(&STp->stats->in_flight);
570 if (cmd[0] == WRITE_6) {
571 atomic_set(&STp->stats->last_write_size, bufflen);
572 STp->stats->write_time = ktime_get();
573 } else if (cmd[0] == READ_6) {
574 atomic_set(&STp->stats->last_read_size, bufflen);
575 STp->stats->read_time = ktime_get();
576 } else {
577 STp->stats->other_time = ktime_get();
578 }
579
580 SRpnt->bio = req->bio;
581 rq->cmd_len = COMMAND_SIZE(cmd[0]);
582 memset(rq->cmd, 0, BLK_MAX_CDB);
583 memcpy(rq->cmd, cmd, rq->cmd_len);
584 req->timeout = timeout;
585 rq->retries = retries;
586 req->end_io_data = SRpnt;
587
588 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
589 return 0;
590}
591
592/* Do the scsi command. Waits until command performed if do_wait is true.
593 Otherwise write_behind_check() is used to check that the command
594 has finished. */
595static struct st_request *
596st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
597 int bytes, int direction, int timeout, int retries, int do_wait)
598{
599 struct completion *waiting;
600 struct rq_map_data *mdata = &STp->buffer->map_data;
601 int ret;
602
603 /* if async, make sure there's no command outstanding */
604 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
605 st_printk(KERN_ERR, STp,
606 "Async command already active.\n");
607 if (signal_pending(current))
608 (STp->buffer)->syscall_result = (-EINTR);
609 else
610 (STp->buffer)->syscall_result = (-EBUSY);
611 return NULL;
612 }
613
614 if (!SRpnt) {
615 SRpnt = st_allocate_request(STp);
616 if (!SRpnt)
617 return NULL;
618 }
619
620 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
621 which IO is outstanding. It's nulled out when the IO completes. */
622 if (!do_wait)
623 (STp->buffer)->last_SRpnt = SRpnt;
624
625 waiting = &STp->wait;
626 init_completion(waiting);
627 SRpnt->waiting = waiting;
628
629 if (STp->buffer->do_dio) {
630 mdata->page_order = 0;
631 mdata->nr_entries = STp->buffer->sg_segs;
632 mdata->pages = STp->buffer->mapped_pages;
633 } else {
634 mdata->page_order = STp->buffer->reserved_page_order;
635 mdata->nr_entries =
636 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
637 mdata->pages = STp->buffer->reserved_pages;
638 mdata->offset = 0;
639 }
640
641 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
642 STp->buffer->cmdstat.have_sense = 0;
643 STp->buffer->syscall_result = 0;
644
645 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
646 retries);
647 if (ret) {
648 /* could not allocate the buffer or request was too large */
649 (STp->buffer)->syscall_result = (-EBUSY);
650 (STp->buffer)->last_SRpnt = NULL;
651 } else if (do_wait) {
652 wait_for_completion(waiting);
653 SRpnt->waiting = NULL;
654 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
655 }
656
657 return SRpnt;
658}
659
660
661/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
662 write has been correct but EOM early warning reached, -EIO if write ended in
663 error or zero if write successful. Asynchronous writes are used only in
664 variable block mode. */
665static int write_behind_check(struct scsi_tape * STp)
666{
667 int retval = 0;
668 struct st_buffer *STbuffer;
669 struct st_partstat *STps;
670 struct st_cmdstatus *cmdstatp;
671 struct st_request *SRpnt;
672
673 STbuffer = STp->buffer;
674 if (!STbuffer->writing)
675 return 0;
676
677 DEB(
678 if (STp->write_pending)
679 STp->nbr_waits++;
680 else
681 STp->nbr_finished++;
682 ) /* end DEB */
683
684 wait_for_completion(&(STp->wait));
685 SRpnt = STbuffer->last_SRpnt;
686 STbuffer->last_SRpnt = NULL;
687 SRpnt->waiting = NULL;
688
689 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
690 st_release_request(SRpnt);
691
692 STbuffer->buffer_bytes -= STbuffer->writing;
693 STps = &(STp->ps[STp->partition]);
694 if (STps->drv_block >= 0) {
695 if (STp->block_size == 0)
696 STps->drv_block++;
697 else
698 STps->drv_block += STbuffer->writing / STp->block_size;
699 }
700
701 cmdstatp = &STbuffer->cmdstat;
702 if (STbuffer->syscall_result) {
703 retval = -EIO;
704 if (cmdstatp->have_sense && !cmdstatp->deferred &&
705 (cmdstatp->flags & SENSE_EOM) &&
706 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
707 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
708 /* EOM at write-behind, has all data been written? */
709 if (!cmdstatp->remainder_valid ||
710 cmdstatp->uremainder64 == 0)
711 retval = -ENOSPC;
712 }
713 if (retval == -EIO)
714 STps->drv_block = -1;
715 }
716 STbuffer->writing = 0;
717
718 DEB(if (debugging && retval)
719 st_printk(ST_DEB_MSG, STp,
720 "Async write error %x, return value %d.\n",
721 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
722
723 return retval;
724}
725
726
727/* Step over EOF if it has been inadvertently crossed (ioctl not used because
728 it messes up the block number). */
729static int cross_eof(struct scsi_tape * STp, int forward)
730{
731 struct st_request *SRpnt;
732 unsigned char cmd[MAX_COMMAND_SIZE];
733
734 cmd[0] = SPACE;
735 cmd[1] = 0x01; /* Space FileMarks */
736 if (forward) {
737 cmd[2] = cmd[3] = 0;
738 cmd[4] = 1;
739 } else
740 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
741 cmd[5] = 0;
742
743 DEBC_printk(STp, "Stepping over filemark %s.\n",
744 forward ? "forward" : "backward");
745
746 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
747 STp->device->request_queue->rq_timeout,
748 MAX_RETRIES, 1);
749 if (!SRpnt)
750 return (STp->buffer)->syscall_result;
751
752 st_release_request(SRpnt);
753 SRpnt = NULL;
754
755 if ((STp->buffer)->cmdstat.midlevel_result != 0)
756 st_printk(KERN_ERR, STp,
757 "Stepping over filemark %s failed.\n",
758 forward ? "forward" : "backward");
759
760 return (STp->buffer)->syscall_result;
761}
762
763
764/* Flush the write buffer (never need to write if variable blocksize). */
765static int st_flush_write_buffer(struct scsi_tape * STp)
766{
767 int transfer, blks;
768 int result;
769 unsigned char cmd[MAX_COMMAND_SIZE];
770 struct st_request *SRpnt;
771 struct st_partstat *STps;
772
773 result = write_behind_check(STp);
774 if (result)
775 return result;
776
777 result = 0;
778 if (STp->dirty == 1) {
779
780 transfer = STp->buffer->buffer_bytes;
781 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
782
783 memset(cmd, 0, MAX_COMMAND_SIZE);
784 cmd[0] = WRITE_6;
785 cmd[1] = 1;
786 blks = transfer / STp->block_size;
787 cmd[2] = blks >> 16;
788 cmd[3] = blks >> 8;
789 cmd[4] = blks;
790
791 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
792 STp->device->request_queue->rq_timeout,
793 MAX_WRITE_RETRIES, 1);
794 if (!SRpnt)
795 return (STp->buffer)->syscall_result;
796
797 STps = &(STp->ps[STp->partition]);
798 if ((STp->buffer)->syscall_result != 0) {
799 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
800
801 if (cmdstatp->have_sense && !cmdstatp->deferred &&
802 (cmdstatp->flags & SENSE_EOM) &&
803 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
804 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
805 (!cmdstatp->remainder_valid ||
806 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
807 STp->dirty = 0;
808 (STp->buffer)->buffer_bytes = 0;
809 if (STps->drv_block >= 0)
810 STps->drv_block += blks;
811 result = (-ENOSPC);
812 } else {
813 st_printk(KERN_ERR, STp, "Error on flush.\n");
814 STps->drv_block = (-1);
815 result = (-EIO);
816 }
817 } else {
818 if (STps->drv_block >= 0)
819 STps->drv_block += blks;
820 STp->dirty = 0;
821 (STp->buffer)->buffer_bytes = 0;
822 }
823 st_release_request(SRpnt);
824 SRpnt = NULL;
825 }
826 return result;
827}
828
829
830/* Flush the tape buffer. The tape will be positioned correctly unless
831 seek_next is true. */
832static int flush_buffer(struct scsi_tape *STp, int seek_next)
833{
834 int backspace, result;
835 struct st_partstat *STps;
836
837 /*
838 * If there was a bus reset, block further access
839 * to this device.
840 */
841 if (STp->pos_unknown)
842 return (-EIO);
843
844 if (STp->ready != ST_READY)
845 return 0;
846 STps = &(STp->ps[STp->partition]);
847 if (STps->rw == ST_WRITING) /* Writing */
848 return st_flush_write_buffer(STp);
849
850 if (STp->block_size == 0)
851 return 0;
852
853 backspace = ((STp->buffer)->buffer_bytes +
854 (STp->buffer)->read_pointer) / STp->block_size -
855 ((STp->buffer)->read_pointer + STp->block_size - 1) /
856 STp->block_size;
857 (STp->buffer)->buffer_bytes = 0;
858 (STp->buffer)->read_pointer = 0;
859 result = 0;
860 if (!seek_next) {
861 if (STps->eof == ST_FM_HIT) {
862 result = cross_eof(STp, 0); /* Back over the EOF hit */
863 if (!result)
864 STps->eof = ST_NOEOF;
865 else {
866 if (STps->drv_file >= 0)
867 STps->drv_file++;
868 STps->drv_block = 0;
869 }
870 }
871 if (!result && backspace > 0)
872 result = st_int_ioctl(STp, MTBSR, backspace);
873 } else if (STps->eof == ST_FM_HIT) {
874 if (STps->drv_file >= 0)
875 STps->drv_file++;
876 STps->drv_block = 0;
877 STps->eof = ST_NOEOF;
878 }
879 return result;
880
881}
882
883/* Set the mode parameters */
884static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
885{
886 int set_it = 0;
887 unsigned long arg;
888
889 if (!STp->density_changed &&
890 STm->default_density >= 0 &&
891 STm->default_density != STp->density) {
892 arg = STm->default_density;
893 set_it = 1;
894 } else
895 arg = STp->density;
896 arg <<= MT_ST_DENSITY_SHIFT;
897 if (!STp->blksize_changed &&
898 STm->default_blksize >= 0 &&
899 STm->default_blksize != STp->block_size) {
900 arg |= STm->default_blksize;
901 set_it = 1;
902 } else
903 arg |= STp->block_size;
904 if (set_it &&
905 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
906 st_printk(KERN_WARNING, STp,
907 "Can't set default block size to %d bytes "
908 "and density %x.\n",
909 STm->default_blksize, STm->default_density);
910 if (modes_defined)
911 return (-EINVAL);
912 }
913 return 0;
914}
915
916
917/* Lock or unlock the drive door. Don't use when st_request allocated. */
918static int do_door_lock(struct scsi_tape * STp, int do_lock)
919{
920 int retval;
921
922 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
923
924 retval = scsi_set_medium_removal(STp->device,
925 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
926 if (!retval)
927 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
928 else
929 STp->door_locked = ST_LOCK_FAILS;
930 return retval;
931}
932
933
934/* Set the internal state after reset */
935static void reset_state(struct scsi_tape *STp)
936{
937 int i;
938 struct st_partstat *STps;
939
940 STp->pos_unknown = 0;
941 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
942 STps = &(STp->ps[i]);
943 STps->rw = ST_IDLE;
944 STps->eof = ST_NOEOF;
945 STps->at_sm = 0;
946 STps->last_block_valid = 0;
947 STps->drv_block = -1;
948 STps->drv_file = -1;
949 }
950 if (STp->can_partitions) {
951 STp->partition = find_partition(STp);
952 if (STp->partition < 0)
953 STp->partition = 0;
954 STp->new_partition = STp->partition;
955 }
956}
957
958/* Test if the drive is ready. Returns either one of the codes below or a negative system
959 error code. */
960#define CHKRES_READY 0
961#define CHKRES_NEW_SESSION 1
962#define CHKRES_NOT_READY 2
963#define CHKRES_NO_TAPE 3
964
965#define MAX_ATTENTIONS 10
966
967static int test_ready(struct scsi_tape *STp, int do_wait)
968{
969 int attentions, waits, max_wait, scode;
970 int retval = CHKRES_READY, new_session = 0;
971 unsigned char cmd[MAX_COMMAND_SIZE];
972 struct st_request *SRpnt = NULL;
973 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
974
975 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
976
977 for (attentions=waits=0; ; ) {
978 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
979 cmd[0] = TEST_UNIT_READY;
980 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
981 STp->long_timeout, MAX_READY_RETRIES, 1);
982
983 if (!SRpnt) {
984 retval = (STp->buffer)->syscall_result;
985 break;
986 }
987
988 if (cmdstatp->have_sense) {
989
990 scode = cmdstatp->sense_hdr.sense_key;
991
992 if (scode == UNIT_ATTENTION) { /* New media? */
993 new_session = 1;
994 if (attentions < MAX_ATTENTIONS) {
995 attentions++;
996 continue;
997 }
998 else {
999 retval = (-EIO);
1000 break;
1001 }
1002 }
1003
1004 if (scode == NOT_READY) {
1005 if (waits < max_wait) {
1006 if (msleep_interruptible(1000)) {
1007 retval = (-EINTR);
1008 break;
1009 }
1010 waits++;
1011 continue;
1012 }
1013 else {
1014 if ((STp->device)->scsi_level >= SCSI_2 &&
1015 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1016 retval = CHKRES_NO_TAPE;
1017 else
1018 retval = CHKRES_NOT_READY;
1019 break;
1020 }
1021 }
1022 }
1023
1024 retval = (STp->buffer)->syscall_result;
1025 if (!retval)
1026 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1027 break;
1028 }
1029
1030 if (SRpnt != NULL)
1031 st_release_request(SRpnt);
1032 return retval;
1033}
1034
1035
1036/* See if the drive is ready and gather information about the tape. Return values:
1037 < 0 negative error code from errno.h
1038 0 drive ready
1039 1 drive not ready (possibly no tape)
1040*/
1041static int check_tape(struct scsi_tape *STp, struct file *filp)
1042{
1043 int i, retval, new_session = 0, do_wait;
1044 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1045 unsigned short st_flags = filp->f_flags;
1046 struct st_request *SRpnt = NULL;
1047 struct st_modedef *STm;
1048 struct st_partstat *STps;
1049 struct inode *inode = file_inode(filp);
1050 int mode = TAPE_MODE(inode);
1051
1052 STp->ready = ST_READY;
1053
1054 if (mode != STp->current_mode) {
1055 DEBC_printk(STp, "Mode change from %d to %d.\n",
1056 STp->current_mode, mode);
1057 new_session = 1;
1058 STp->current_mode = mode;
1059 }
1060 STm = &(STp->modes[STp->current_mode]);
1061
1062 saved_cleaning = STp->cleaning_req;
1063 STp->cleaning_req = 0;
1064
1065 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1066 retval = test_ready(STp, do_wait);
1067
1068 if (retval < 0)
1069 goto err_out;
1070
1071 if (retval == CHKRES_NEW_SESSION) {
1072 STp->pos_unknown = 0;
1073 STp->partition = STp->new_partition = 0;
1074 if (STp->can_partitions)
1075 STp->nbr_partitions = 1; /* This guess will be updated later
1076 if necessary */
1077 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1078 STps = &(STp->ps[i]);
1079 STps->rw = ST_IDLE;
1080 STps->eof = ST_NOEOF;
1081 STps->at_sm = 0;
1082 STps->last_block_valid = 0;
1083 STps->drv_block = 0;
1084 STps->drv_file = 0;
1085 }
1086 new_session = 1;
1087 }
1088 else {
1089 STp->cleaning_req |= saved_cleaning;
1090
1091 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1092 if (retval == CHKRES_NO_TAPE)
1093 STp->ready = ST_NO_TAPE;
1094 else
1095 STp->ready = ST_NOT_READY;
1096
1097 STp->density = 0; /* Clear the erroneous "residue" */
1098 STp->write_prot = 0;
1099 STp->block_size = 0;
1100 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1101 STp->partition = STp->new_partition = 0;
1102 STp->door_locked = ST_UNLOCKED;
1103 return CHKRES_NOT_READY;
1104 }
1105 }
1106
1107 if (STp->omit_blklims)
1108 STp->min_block = STp->max_block = (-1);
1109 else {
1110 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1111 cmd[0] = READ_BLOCK_LIMITS;
1112
1113 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1114 STp->device->request_queue->rq_timeout,
1115 MAX_READY_RETRIES, 1);
1116 if (!SRpnt) {
1117 retval = (STp->buffer)->syscall_result;
1118 goto err_out;
1119 }
1120
1121 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1122 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1123 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1124 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1125 (STp->buffer)->b_data[5];
1126 if ( DEB( debugging || ) !STp->inited)
1127 st_printk(KERN_INFO, STp,
1128 "Block limits %d - %d bytes.\n",
1129 STp->min_block, STp->max_block);
1130 } else {
1131 STp->min_block = STp->max_block = (-1);
1132 DEBC_printk(STp, "Can't read block limits.\n");
1133 }
1134 }
1135
1136 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1137 cmd[0] = MODE_SENSE;
1138 cmd[4] = 12;
1139
1140 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1141 STp->device->request_queue->rq_timeout,
1142 MAX_READY_RETRIES, 1);
1143 if (!SRpnt) {
1144 retval = (STp->buffer)->syscall_result;
1145 goto err_out;
1146 }
1147
1148 if ((STp->buffer)->syscall_result != 0) {
1149 DEBC_printk(STp, "No Mode Sense.\n");
1150 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1151 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1152 STp->drv_write_prot = 0;
1153 } else {
1154 DEBC_printk(STp,"Mode sense. Length %d, "
1155 "medium %x, WBS %x, BLL %d\n",
1156 (STp->buffer)->b_data[0],
1157 (STp->buffer)->b_data[1],
1158 (STp->buffer)->b_data[2],
1159 (STp->buffer)->b_data[3]);
1160
1161 if ((STp->buffer)->b_data[3] >= 8) {
1162 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1163 STp->density = (STp->buffer)->b_data[4];
1164 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1165 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1166 DEBC_printk(STp, "Density %x, tape length: %x, "
1167 "drv buffer: %d\n",
1168 STp->density,
1169 (STp->buffer)->b_data[5] * 65536 +
1170 (STp->buffer)->b_data[6] * 256 +
1171 (STp->buffer)->b_data[7],
1172 STp->drv_buffer);
1173 }
1174 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1175 if (!STp->drv_buffer && STp->immediate_filemark) {
1176 st_printk(KERN_WARNING, STp,
1177 "non-buffered tape: disabling "
1178 "writing immediate filemarks\n");
1179 STp->immediate_filemark = 0;
1180 }
1181 }
1182 st_release_request(SRpnt);
1183 SRpnt = NULL;
1184 STp->inited = 1;
1185
1186 if (STp->block_size > 0)
1187 (STp->buffer)->buffer_blocks =
1188 (STp->buffer)->buffer_size / STp->block_size;
1189 else
1190 (STp->buffer)->buffer_blocks = 1;
1191 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1192
1193 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1194 STp->block_size, (STp->buffer)->buffer_size,
1195 (STp->buffer)->buffer_blocks);
1196
1197 if (STp->drv_write_prot) {
1198 STp->write_prot = 1;
1199
1200 DEBC_printk(STp, "Write protected\n");
1201
1202 if (do_wait &&
1203 ((st_flags & O_ACCMODE) == O_WRONLY ||
1204 (st_flags & O_ACCMODE) == O_RDWR)) {
1205 retval = (-EROFS);
1206 goto err_out;
1207 }
1208 }
1209
1210 if (STp->can_partitions && STp->nbr_partitions < 1) {
1211 /* This code is reached when the device is opened for the first time
1212 after the driver has been initialized with tape in the drive and the
1213 partition support has been enabled. */
1214 DEBC_printk(STp, "Updating partition number in status.\n");
1215 if ((STp->partition = find_partition(STp)) < 0) {
1216 retval = STp->partition;
1217 goto err_out;
1218 }
1219 STp->new_partition = STp->partition;
1220 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1221 }
1222
1223 if (new_session) { /* Change the drive parameters for the new mode */
1224 STp->density_changed = STp->blksize_changed = 0;
1225 STp->compression_changed = 0;
1226 if (!(STm->defaults_for_writes) &&
1227 (retval = set_mode_densblk(STp, STm)) < 0)
1228 goto err_out;
1229
1230 if (STp->default_drvbuffer != 0xff) {
1231 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1232 st_printk(KERN_WARNING, STp,
1233 "Can't set default drive "
1234 "buffering to %d.\n",
1235 STp->default_drvbuffer);
1236 }
1237 }
1238
1239 return CHKRES_READY;
1240
1241 err_out:
1242 return retval;
1243}
1244
1245
1246 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1247 module count. */
1248static int st_open(struct inode *inode, struct file *filp)
1249{
1250 int i, retval = (-EIO);
1251 int resumed = 0;
1252 struct scsi_tape *STp;
1253 struct st_partstat *STps;
1254 int dev = TAPE_NR(inode);
1255
1256 /*
1257 * We really want to do nonseekable_open(inode, filp); here, but some
1258 * versions of tar incorrectly call lseek on tapes and bail out if that
1259 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1260 */
1261 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1262
1263 if (!(STp = scsi_tape_get(dev))) {
1264 return -ENXIO;
1265 }
1266
1267 filp->private_data = STp;
1268
1269 spin_lock(&st_use_lock);
1270 if (STp->in_use) {
1271 spin_unlock(&st_use_lock);
1272 scsi_tape_put(STp);
1273 DEBC_printk(STp, "Device already in use.\n");
1274 return (-EBUSY);
1275 }
1276
1277 STp->in_use = 1;
1278 spin_unlock(&st_use_lock);
1279 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1280
1281 if (scsi_autopm_get_device(STp->device) < 0) {
1282 retval = -EIO;
1283 goto err_out;
1284 }
1285 resumed = 1;
1286 if (!scsi_block_when_processing_errors(STp->device)) {
1287 retval = (-ENXIO);
1288 goto err_out;
1289 }
1290
1291 /* See that we have at least a one page buffer available */
1292 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1293 st_printk(KERN_WARNING, STp,
1294 "Can't allocate one page tape buffer.\n");
1295 retval = (-EOVERFLOW);
1296 goto err_out;
1297 }
1298
1299 (STp->buffer)->cleared = 0;
1300 (STp->buffer)->writing = 0;
1301 (STp->buffer)->syscall_result = 0;
1302
1303 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1304
1305 STp->dirty = 0;
1306 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1307 STps = &(STp->ps[i]);
1308 STps->rw = ST_IDLE;
1309 }
1310 STp->try_dio_now = STp->try_dio;
1311 STp->recover_count = 0;
1312 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1313 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1314
1315 retval = check_tape(STp, filp);
1316 if (retval < 0)
1317 goto err_out;
1318 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1319 retval != CHKRES_READY) {
1320 if (STp->ready == NO_TAPE)
1321 retval = (-ENOMEDIUM);
1322 else
1323 retval = (-EIO);
1324 goto err_out;
1325 }
1326 return 0;
1327
1328 err_out:
1329 normalize_buffer(STp->buffer);
1330 spin_lock(&st_use_lock);
1331 STp->in_use = 0;
1332 spin_unlock(&st_use_lock);
1333 if (resumed)
1334 scsi_autopm_put_device(STp->device);
1335 scsi_tape_put(STp);
1336 return retval;
1337
1338}
1339
1340
1341/* Flush the tape buffer before close */
1342static int st_flush(struct file *filp, fl_owner_t id)
1343{
1344 int result = 0, result2;
1345 unsigned char cmd[MAX_COMMAND_SIZE];
1346 struct st_request *SRpnt;
1347 struct scsi_tape *STp = filp->private_data;
1348 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1349 struct st_partstat *STps = &(STp->ps[STp->partition]);
1350
1351 if (file_count(filp) > 1)
1352 return 0;
1353
1354 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1355 result = st_flush_write_buffer(STp);
1356 if (result != 0 && result != (-ENOSPC))
1357 goto out;
1358 }
1359
1360 if (STp->can_partitions &&
1361 (result2 = switch_partition(STp)) < 0) {
1362 DEBC_printk(STp, "switch_partition at close failed.\n");
1363 if (result == 0)
1364 result = result2;
1365 goto out;
1366 }
1367
1368 DEBC( if (STp->nbr_requests)
1369 st_printk(KERN_DEBUG, STp,
1370 "Number of r/w requests %d, dio used in %d, "
1371 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1372 STp->nbr_pages));
1373
1374 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1375 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1376
1377#if DEBUG
1378 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1379 STp->nbr_waits, STp->nbr_finished);
1380#endif
1381 memset(cmd, 0, MAX_COMMAND_SIZE);
1382 cmd[0] = WRITE_FILEMARKS;
1383 if (STp->immediate_filemark)
1384 cmd[1] = 1;
1385 cmd[4] = 1 + STp->two_fm;
1386
1387 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1388 STp->device->request_queue->rq_timeout,
1389 MAX_WRITE_RETRIES, 1);
1390 if (!SRpnt) {
1391 result = (STp->buffer)->syscall_result;
1392 goto out;
1393 }
1394
1395 if (STp->buffer->syscall_result == 0 ||
1396 (cmdstatp->have_sense && !cmdstatp->deferred &&
1397 (cmdstatp->flags & SENSE_EOM) &&
1398 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1399 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1400 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1401 /* Write successful at EOM */
1402 st_release_request(SRpnt);
1403 SRpnt = NULL;
1404 if (STps->drv_file >= 0)
1405 STps->drv_file++;
1406 STps->drv_block = 0;
1407 if (STp->two_fm)
1408 cross_eof(STp, 0);
1409 STps->eof = ST_FM;
1410 }
1411 else { /* Write error */
1412 st_release_request(SRpnt);
1413 SRpnt = NULL;
1414 st_printk(KERN_ERR, STp,
1415 "Error on write filemark.\n");
1416 if (result == 0)
1417 result = (-EIO);
1418 }
1419
1420 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1421 } else if (!STp->rew_at_close) {
1422 STps = &(STp->ps[STp->partition]);
1423 if (!STm->sysv || STps->rw != ST_READING) {
1424 if (STp->can_bsr)
1425 result = flush_buffer(STp, 0);
1426 else if (STps->eof == ST_FM_HIT) {
1427 result = cross_eof(STp, 0);
1428 if (result) {
1429 if (STps->drv_file >= 0)
1430 STps->drv_file++;
1431 STps->drv_block = 0;
1432 STps->eof = ST_FM;
1433 } else
1434 STps->eof = ST_NOEOF;
1435 }
1436 } else if ((STps->eof == ST_NOEOF &&
1437 !(result = cross_eof(STp, 1))) ||
1438 STps->eof == ST_FM_HIT) {
1439 if (STps->drv_file >= 0)
1440 STps->drv_file++;
1441 STps->drv_block = 0;
1442 STps->eof = ST_FM;
1443 }
1444 }
1445
1446 out:
1447 if (STp->rew_at_close) {
1448 result2 = st_int_ioctl(STp, MTREW, 1);
1449 if (result == 0)
1450 result = result2;
1451 }
1452 return result;
1453}
1454
1455
1456/* Close the device and release it. BKL is not needed: this is the only thread
1457 accessing this tape. */
1458static int st_release(struct inode *inode, struct file *filp)
1459{
1460 struct scsi_tape *STp = filp->private_data;
1461
1462 if (STp->door_locked == ST_LOCKED_AUTO)
1463 do_door_lock(STp, 0);
1464
1465 normalize_buffer(STp->buffer);
1466 spin_lock(&st_use_lock);
1467 STp->in_use = 0;
1468 spin_unlock(&st_use_lock);
1469 scsi_autopm_put_device(STp->device);
1470 scsi_tape_put(STp);
1471
1472 return 0;
1473}
1474
1475/* The checks common to both reading and writing */
1476static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1477{
1478 ssize_t retval = 0;
1479
1480 /*
1481 * If we are in the middle of error recovery, don't let anyone
1482 * else try and use this device. Also, if error recovery fails, it
1483 * may try and take the device offline, in which case all further
1484 * access to the device is prohibited.
1485 */
1486 if (!scsi_block_when_processing_errors(STp->device)) {
1487 retval = (-ENXIO);
1488 goto out;
1489 }
1490
1491 if (STp->ready != ST_READY) {
1492 if (STp->ready == ST_NO_TAPE)
1493 retval = (-ENOMEDIUM);
1494 else
1495 retval = (-EIO);
1496 goto out;
1497 }
1498
1499 if (! STp->modes[STp->current_mode].defined) {
1500 retval = (-ENXIO);
1501 goto out;
1502 }
1503
1504
1505 /*
1506 * If there was a bus reset, block further access
1507 * to this device.
1508 */
1509 if (STp->pos_unknown) {
1510 retval = (-EIO);
1511 goto out;
1512 }
1513
1514 if (count == 0)
1515 goto out;
1516
1517 DEB(
1518 if (!STp->in_use) {
1519 st_printk(ST_DEB_MSG, STp,
1520 "Incorrect device.\n");
1521 retval = (-EIO);
1522 goto out;
1523 } ) /* end DEB */
1524
1525 if (STp->can_partitions &&
1526 (retval = switch_partition(STp)) < 0)
1527 goto out;
1528
1529 if (STp->block_size == 0 && STp->max_block > 0 &&
1530 (count < STp->min_block || count > STp->max_block)) {
1531 retval = (-EINVAL);
1532 goto out;
1533 }
1534
1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1536 !do_door_lock(STp, 1))
1537 STp->door_locked = ST_LOCKED_AUTO;
1538
1539 out:
1540 return retval;
1541}
1542
1543
1544static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1545 size_t count, int is_read)
1546{
1547 int i, bufsize, retval = 0;
1548 struct st_buffer *STbp = STp->buffer;
1549
1550 if (is_read)
1551 i = STp->try_dio_now && try_rdio;
1552 else
1553 i = STp->try_dio_now && try_wdio;
1554
1555 if (i && ((unsigned long)buf & queue_dma_alignment(
1556 STp->device->request_queue)) == 0) {
1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1558 count, (is_read ? READ : WRITE));
1559 if (i > 0) {
1560 STbp->do_dio = i;
1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1562 }
1563 else
1564 STbp->do_dio = 0; /* fall back to buffering with any error */
1565 STbp->sg_segs = STbp->do_dio;
1566 DEB(
1567 if (STbp->do_dio) {
1568 STp->nbr_dio++;
1569 STp->nbr_pages += STbp->do_dio;
1570 }
1571 )
1572 } else
1573 STbp->do_dio = 0;
1574 DEB( STp->nbr_requests++; )
1575
1576 if (!STbp->do_dio) {
1577 if (STp->block_size)
1578 bufsize = STp->block_size > st_fixed_buffer_size ?
1579 STp->block_size : st_fixed_buffer_size;
1580 else {
1581 bufsize = count;
1582 /* Make sure that data from previous user is not leaked even if
1583 HBA does not return correct residual */
1584 if (is_read && STp->sili && !STbp->cleared)
1585 clear_buffer(STbp);
1586 }
1587
1588 if (bufsize > STbp->buffer_size &&
1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1590 st_printk(KERN_WARNING, STp,
1591 "Can't allocate %d byte tape buffer.\n",
1592 bufsize);
1593 retval = (-EOVERFLOW);
1594 goto out;
1595 }
1596 if (STp->block_size)
1597 STbp->buffer_blocks = bufsize / STp->block_size;
1598 }
1599
1600 out:
1601 return retval;
1602}
1603
1604
1605/* Can be called more than once after each setup_buffer() */
1606static void release_buffering(struct scsi_tape *STp, int is_read)
1607{
1608 struct st_buffer *STbp;
1609
1610 STbp = STp->buffer;
1611 if (STbp->do_dio) {
1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1613 STbp->do_dio = 0;
1614 STbp->sg_segs = 0;
1615 }
1616}
1617
1618
1619/* Write command */
1620static ssize_t
1621st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1622{
1623 ssize_t total;
1624 ssize_t i, do_count, blks, transfer;
1625 ssize_t retval;
1626 int undone, retry_eot = 0, scode;
1627 int async_write;
1628 unsigned char cmd[MAX_COMMAND_SIZE];
1629 const char __user *b_point;
1630 struct st_request *SRpnt = NULL;
1631 struct scsi_tape *STp = filp->private_data;
1632 struct st_modedef *STm;
1633 struct st_partstat *STps;
1634 struct st_buffer *STbp;
1635
1636 if (mutex_lock_interruptible(&STp->lock))
1637 return -ERESTARTSYS;
1638
1639 retval = rw_checks(STp, filp, count);
1640 if (retval || count == 0)
1641 goto out;
1642
1643 /* Write must be integral number of blocks */
1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1645 st_printk(KERN_WARNING, STp,
1646 "Write not multiple of tape block size.\n");
1647 retval = (-EINVAL);
1648 goto out;
1649 }
1650
1651 STm = &(STp->modes[STp->current_mode]);
1652 STps = &(STp->ps[STp->partition]);
1653
1654 if (STp->write_prot) {
1655 retval = (-EACCES);
1656 goto out;
1657 }
1658
1659
1660 if (STps->rw == ST_READING) {
1661 retval = flush_buffer(STp, 0);
1662 if (retval)
1663 goto out;
1664 STps->rw = ST_WRITING;
1665 } else if (STps->rw != ST_WRITING &&
1666 STps->drv_file == 0 && STps->drv_block == 0) {
1667 if ((retval = set_mode_densblk(STp, STm)) < 0)
1668 goto out;
1669 if (STm->default_compression != ST_DONT_TOUCH &&
1670 !(STp->compression_changed)) {
1671 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1672 st_printk(KERN_WARNING, STp,
1673 "Can't set default compression.\n");
1674 if (modes_defined) {
1675 retval = (-EINVAL);
1676 goto out;
1677 }
1678 }
1679 }
1680 }
1681
1682 STbp = STp->buffer;
1683 i = write_behind_check(STp);
1684 if (i) {
1685 if (i == -ENOSPC)
1686 STps->eof = ST_EOM_OK;
1687 else
1688 STps->eof = ST_EOM_ERROR;
1689 }
1690
1691 if (STps->eof == ST_EOM_OK) {
1692 STps->eof = ST_EOD_1; /* allow next write */
1693 retval = (-ENOSPC);
1694 goto out;
1695 }
1696 else if (STps->eof == ST_EOM_ERROR) {
1697 retval = (-EIO);
1698 goto out;
1699 }
1700
1701 /* Check the buffer readability in cases where copy_user might catch
1702 the problems after some tape movement. */
1703 if (STp->block_size != 0 &&
1704 !STbp->do_dio &&
1705 (copy_from_user(&i, buf, 1) != 0 ||
1706 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1707 retval = (-EFAULT);
1708 goto out;
1709 }
1710
1711 retval = setup_buffering(STp, buf, count, 0);
1712 if (retval)
1713 goto out;
1714
1715 total = count;
1716
1717 memset(cmd, 0, MAX_COMMAND_SIZE);
1718 cmd[0] = WRITE_6;
1719 cmd[1] = (STp->block_size != 0);
1720
1721 STps->rw = ST_WRITING;
1722
1723 b_point = buf;
1724 while (count > 0 && !retry_eot) {
1725
1726 if (STbp->do_dio) {
1727 do_count = count;
1728 }
1729 else {
1730 if (STp->block_size == 0)
1731 do_count = count;
1732 else {
1733 do_count = STbp->buffer_blocks * STp->block_size -
1734 STbp->buffer_bytes;
1735 if (do_count > count)
1736 do_count = count;
1737 }
1738
1739 i = append_to_buffer(b_point, STbp, do_count);
1740 if (i) {
1741 retval = i;
1742 goto out;
1743 }
1744 }
1745 count -= do_count;
1746 b_point += do_count;
1747
1748 async_write = STp->block_size == 0 && !STbp->do_dio &&
1749 STm->do_async_writes && STps->eof < ST_EOM_OK;
1750
1751 if (STp->block_size != 0 && STm->do_buffer_writes &&
1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1753 STbp->buffer_bytes < STbp->buffer_size) {
1754 STp->dirty = 1;
1755 /* Don't write a buffer that is not full enough. */
1756 if (!async_write && count == 0)
1757 break;
1758 }
1759
1760 retry_write:
1761 if (STp->block_size == 0)
1762 blks = transfer = do_count;
1763 else {
1764 if (!STbp->do_dio)
1765 blks = STbp->buffer_bytes;
1766 else
1767 blks = do_count;
1768 blks /= STp->block_size;
1769 transfer = blks * STp->block_size;
1770 }
1771 cmd[2] = blks >> 16;
1772 cmd[3] = blks >> 8;
1773 cmd[4] = blks;
1774
1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1776 STp->device->request_queue->rq_timeout,
1777 MAX_WRITE_RETRIES, !async_write);
1778 if (!SRpnt) {
1779 retval = STbp->syscall_result;
1780 goto out;
1781 }
1782 if (async_write && !STbp->syscall_result) {
1783 STbp->writing = transfer;
1784 STp->dirty = !(STbp->writing ==
1785 STbp->buffer_bytes);
1786 SRpnt = NULL; /* Prevent releasing this request! */
1787 DEB( STp->write_pending = 1; )
1788 break;
1789 }
1790
1791 if (STbp->syscall_result != 0) {
1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1793
1794 DEBC_printk(STp, "Error on write:\n");
1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1796 scode = cmdstatp->sense_hdr.sense_key;
1797 if (cmdstatp->remainder_valid)
1798 undone = (int)cmdstatp->uremainder64;
1799 else if (STp->block_size == 0 &&
1800 scode == VOLUME_OVERFLOW)
1801 undone = transfer;
1802 else
1803 undone = 0;
1804 if (STp->block_size != 0)
1805 undone *= STp->block_size;
1806 if (undone <= do_count) {
1807 /* Only data from this write is not written */
1808 count += undone;
1809 b_point -= undone;
1810 do_count -= undone;
1811 if (STp->block_size)
1812 blks = (transfer - undone) / STp->block_size;
1813 STps->eof = ST_EOM_OK;
1814 /* Continue in fixed block mode if all written
1815 in this request but still something left to write
1816 (retval left to zero)
1817 */
1818 if (STp->block_size == 0 ||
1819 undone > 0 || count == 0)
1820 retval = (-ENOSPC); /* EOM within current request */
1821 DEBC_printk(STp, "EOM with %d "
1822 "bytes unwritten.\n",
1823 (int)count);
1824 } else {
1825 /* EOT within data buffered earlier (possible only
1826 in fixed block mode without direct i/o) */
1827 if (!retry_eot && !cmdstatp->deferred &&
1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1829 move_buffer_data(STp->buffer, transfer - undone);
1830 retry_eot = 1;
1831 if (STps->drv_block >= 0) {
1832 STps->drv_block += (transfer - undone) /
1833 STp->block_size;
1834 }
1835 STps->eof = ST_EOM_OK;
1836 DEBC_printk(STp, "Retry "
1837 "write of %d "
1838 "bytes at EOM.\n",
1839 STp->buffer->buffer_bytes);
1840 goto retry_write;
1841 }
1842 else {
1843 /* Either error within data buffered by driver or
1844 failed retry */
1845 count -= do_count;
1846 blks = do_count = 0;
1847 STps->eof = ST_EOM_ERROR;
1848 STps->drv_block = (-1); /* Too cautious? */
1849 retval = (-EIO); /* EOM for old data */
1850 DEBC_printk(STp, "EOM with "
1851 "lost data.\n");
1852 }
1853 }
1854 } else {
1855 count += do_count;
1856 STps->drv_block = (-1); /* Too cautious? */
1857 retval = STbp->syscall_result;
1858 }
1859
1860 }
1861
1862 if (STps->drv_block >= 0) {
1863 if (STp->block_size == 0)
1864 STps->drv_block += (do_count > 0);
1865 else
1866 STps->drv_block += blks;
1867 }
1868
1869 STbp->buffer_bytes = 0;
1870 STp->dirty = 0;
1871
1872 if (retval || retry_eot) {
1873 if (count < total)
1874 retval = total - count;
1875 goto out;
1876 }
1877 }
1878
1879 if (STps->eof == ST_EOD_1)
1880 STps->eof = ST_EOM_OK;
1881 else if (STps->eof != ST_EOM_OK)
1882 STps->eof = ST_NOEOF;
1883 retval = total - count;
1884
1885 out:
1886 if (SRpnt != NULL)
1887 st_release_request(SRpnt);
1888 release_buffering(STp, 0);
1889 mutex_unlock(&STp->lock);
1890
1891 return retval;
1892}
1893
1894/* Read data from the tape. Returns zero in the normal case, one if the
1895 eof status has changed, and the negative error code in case of a
1896 fatal error. Otherwise updates the buffer and the eof state.
1897
1898 Does release user buffer mapping if it is set.
1899*/
1900static long read_tape(struct scsi_tape *STp, long count,
1901 struct st_request ** aSRpnt)
1902{
1903 int transfer, blks, bytes;
1904 unsigned char cmd[MAX_COMMAND_SIZE];
1905 struct st_request *SRpnt;
1906 struct st_modedef *STm;
1907 struct st_partstat *STps;
1908 struct st_buffer *STbp;
1909 int retval = 0;
1910
1911 if (count == 0)
1912 return 0;
1913
1914 STm = &(STp->modes[STp->current_mode]);
1915 STps = &(STp->ps[STp->partition]);
1916 if (STps->eof == ST_FM_HIT)
1917 return 1;
1918 STbp = STp->buffer;
1919
1920 if (STp->block_size == 0)
1921 blks = bytes = count;
1922 else {
1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1924 blks = (STp->buffer)->buffer_blocks;
1925 bytes = blks * STp->block_size;
1926 } else {
1927 bytes = count;
1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1929 bytes = (STp->buffer)->buffer_size;
1930 blks = bytes / STp->block_size;
1931 bytes = blks * STp->block_size;
1932 }
1933 }
1934
1935 memset(cmd, 0, MAX_COMMAND_SIZE);
1936 cmd[0] = READ_6;
1937 cmd[1] = (STp->block_size != 0);
1938 if (!cmd[1] && STp->sili)
1939 cmd[1] |= 2;
1940 cmd[2] = blks >> 16;
1941 cmd[3] = blks >> 8;
1942 cmd[4] = blks;
1943
1944 SRpnt = *aSRpnt;
1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1946 STp->device->request_queue->rq_timeout,
1947 MAX_RETRIES, 1);
1948 release_buffering(STp, 1);
1949 *aSRpnt = SRpnt;
1950 if (!SRpnt)
1951 return STbp->syscall_result;
1952
1953 STbp->read_pointer = 0;
1954 STps->at_sm = 0;
1955
1956 /* Something to check */
1957 if (STbp->syscall_result) {
1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1959
1960 retval = 1;
1961 DEBC_printk(STp,
1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1963 SRpnt->sense[0], SRpnt->sense[1],
1964 SRpnt->sense[2], SRpnt->sense[3],
1965 SRpnt->sense[4], SRpnt->sense[5],
1966 SRpnt->sense[6], SRpnt->sense[7]);
1967 if (cmdstatp->have_sense) {
1968
1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1971
1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1973 /* Compute the residual count */
1974 if (cmdstatp->remainder_valid)
1975 transfer = (int)cmdstatp->uremainder64;
1976 else
1977 transfer = 0;
1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1979 if (STp->block_size == 0)
1980 transfer = bytes;
1981 /* Some drives set ILI with MEDIUM ERROR */
1982 cmdstatp->flags &= ~SENSE_ILI;
1983 }
1984
1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1986 if (STp->block_size == 0 &&
1987 transfer < 0) {
1988 st_printk(KERN_NOTICE, STp,
1989 "Failed to read %d "
1990 "byte block with %d "
1991 "byte transfer.\n",
1992 bytes - transfer,
1993 bytes);
1994 if (STps->drv_block >= 0)
1995 STps->drv_block += 1;
1996 STbp->buffer_bytes = 0;
1997 return (-ENOMEM);
1998 } else if (STp->block_size == 0) {
1999 STbp->buffer_bytes = bytes - transfer;
2000 } else {
2001 st_release_request(SRpnt);
2002 SRpnt = *aSRpnt = NULL;
2003 if (transfer == blks) { /* We did not get anything, error */
2004 st_printk(KERN_NOTICE, STp,
2005 "Incorrect "
2006 "block size.\n");
2007 if (STps->drv_block >= 0)
2008 STps->drv_block += blks - transfer + 1;
2009 st_int_ioctl(STp, MTBSR, 1);
2010 return (-EIO);
2011 }
2012 /* We have some data, deliver it */
2013 STbp->buffer_bytes = (blks - transfer) *
2014 STp->block_size;
2015 DEBC_printk(STp, "ILI but "
2016 "enough data "
2017 "received %ld "
2018 "%d.\n", count,
2019 STbp->buffer_bytes);
2020 if (STps->drv_block >= 0)
2021 STps->drv_block += 1;
2022 if (st_int_ioctl(STp, MTBSR, 1))
2023 return (-EIO);
2024 }
2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2026 if (STps->eof != ST_FM_HIT)
2027 STps->eof = ST_FM_HIT;
2028 else
2029 STps->eof = ST_EOD_2;
2030 if (STp->block_size == 0)
2031 STbp->buffer_bytes = 0;
2032 else
2033 STbp->buffer_bytes =
2034 bytes - transfer * STp->block_size;
2035 DEBC_printk(STp, "EOF detected (%d "
2036 "bytes read).\n",
2037 STbp->buffer_bytes);
2038 } else if (cmdstatp->flags & SENSE_EOM) {
2039 if (STps->eof == ST_FM)
2040 STps->eof = ST_EOD_1;
2041 else
2042 STps->eof = ST_EOM_OK;
2043 if (STp->block_size == 0)
2044 STbp->buffer_bytes = bytes - transfer;
2045 else
2046 STbp->buffer_bytes =
2047 bytes - transfer * STp->block_size;
2048
2049 DEBC_printk(STp, "EOM detected (%d "
2050 "bytes read).\n",
2051 STbp->buffer_bytes);
2052 }
2053 }
2054 /* end of EOF, EOM, ILI test */
2055 else { /* nonzero sense key */
2056 DEBC_printk(STp, "Tape error while reading.\n");
2057 STps->drv_block = (-1);
2058 if (STps->eof == ST_FM &&
2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2060 DEBC_printk(STp, "Zero returned for "
2061 "first BLANK CHECK "
2062 "after EOF.\n");
2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2064 } else /* Some other extended sense code */
2065 retval = (-EIO);
2066 }
2067
2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2069 STbp->buffer_bytes = 0;
2070 }
2071 /* End of extended sense test */
2072 else { /* Non-extended sense */
2073 retval = STbp->syscall_result;
2074 }
2075
2076 }
2077 /* End of error handling */
2078 else { /* Read successful */
2079 STbp->buffer_bytes = bytes;
2080 if (STp->sili) /* In fixed block mode residual is always zero here */
2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2082 }
2083
2084 if (STps->drv_block >= 0) {
2085 if (STp->block_size == 0)
2086 STps->drv_block++;
2087 else
2088 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2089 }
2090 return retval;
2091}
2092
2093
2094/* Read command */
2095static ssize_t
2096st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2097{
2098 ssize_t total;
2099 ssize_t retval = 0;
2100 ssize_t i, transfer;
2101 int special, do_dio = 0;
2102 struct st_request *SRpnt = NULL;
2103 struct scsi_tape *STp = filp->private_data;
2104 struct st_modedef *STm;
2105 struct st_partstat *STps;
2106 struct st_buffer *STbp = STp->buffer;
2107
2108 if (mutex_lock_interruptible(&STp->lock))
2109 return -ERESTARTSYS;
2110
2111 retval = rw_checks(STp, filp, count);
2112 if (retval || count == 0)
2113 goto out;
2114
2115 STm = &(STp->modes[STp->current_mode]);
2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2117 if (!STm->do_read_ahead) {
2118 retval = (-EINVAL); /* Read must be integral number of blocks */
2119 goto out;
2120 }
2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2122 }
2123
2124 STps = &(STp->ps[STp->partition]);
2125 if (STps->rw == ST_WRITING) {
2126 retval = flush_buffer(STp, 0);
2127 if (retval)
2128 goto out;
2129 STps->rw = ST_READING;
2130 }
2131 DEB(
2132 if (debugging && STps->eof != ST_NOEOF)
2133 st_printk(ST_DEB_MSG, STp,
2134 "EOF/EOM flag up (%d). Bytes %d\n",
2135 STps->eof, STbp->buffer_bytes);
2136 ) /* end DEB */
2137
2138 retval = setup_buffering(STp, buf, count, 1);
2139 if (retval)
2140 goto out;
2141 do_dio = STbp->do_dio;
2142
2143 if (STbp->buffer_bytes == 0 &&
2144 STps->eof >= ST_EOD_1) {
2145 if (STps->eof < ST_EOD) {
2146 STps->eof += 1;
2147 retval = 0;
2148 goto out;
2149 }
2150 retval = (-EIO); /* EOM or Blank Check */
2151 goto out;
2152 }
2153
2154 if (do_dio) {
2155 /* Check the buffer writability before any tape movement. Don't alter
2156 buffer data. */
2157 if (copy_from_user(&i, buf, 1) != 0 ||
2158 copy_to_user(buf, &i, 1) != 0 ||
2159 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2160 copy_to_user(buf + count - 1, &i, 1) != 0) {
2161 retval = (-EFAULT);
2162 goto out;
2163 }
2164 }
2165
2166 STps->rw = ST_READING;
2167
2168
2169 /* Loop until enough data in buffer or a special condition found */
2170 for (total = 0, special = 0; total < count && !special;) {
2171
2172 /* Get new data if the buffer is empty */
2173 if (STbp->buffer_bytes == 0) {
2174 special = read_tape(STp, count - total, &SRpnt);
2175 if (special < 0) { /* No need to continue read */
2176 retval = special;
2177 goto out;
2178 }
2179 }
2180
2181 /* Move the data from driver buffer to user buffer */
2182 if (STbp->buffer_bytes > 0) {
2183 DEB(
2184 if (debugging && STps->eof != ST_NOEOF)
2185 st_printk(ST_DEB_MSG, STp,
2186 "EOF up (%d). Left %d, needed %d.\n",
2187 STps->eof, STbp->buffer_bytes,
2188 (int)(count - total));
2189 ) /* end DEB */
2190 transfer = STbp->buffer_bytes < count - total ?
2191 STbp->buffer_bytes : count - total;
2192 if (!do_dio) {
2193 i = from_buffer(STbp, buf, transfer);
2194 if (i) {
2195 retval = i;
2196 goto out;
2197 }
2198 }
2199 buf += transfer;
2200 total += transfer;
2201 }
2202
2203 if (STp->block_size == 0)
2204 break; /* Read only one variable length block */
2205
2206 } /* for (total = 0, special = 0;
2207 total < count && !special; ) */
2208
2209 /* Change the eof state if no data from tape or buffer */
2210 if (total == 0) {
2211 if (STps->eof == ST_FM_HIT) {
2212 STps->eof = ST_FM;
2213 STps->drv_block = 0;
2214 if (STps->drv_file >= 0)
2215 STps->drv_file++;
2216 } else if (STps->eof == ST_EOD_1) {
2217 STps->eof = ST_EOD_2;
2218 STps->drv_block = 0;
2219 if (STps->drv_file >= 0)
2220 STps->drv_file++;
2221 } else if (STps->eof == ST_EOD_2)
2222 STps->eof = ST_EOD;
2223 } else if (STps->eof == ST_FM)
2224 STps->eof = ST_NOEOF;
2225 retval = total;
2226
2227 out:
2228 if (SRpnt != NULL) {
2229 st_release_request(SRpnt);
2230 SRpnt = NULL;
2231 }
2232 if (do_dio) {
2233 release_buffering(STp, 1);
2234 STbp->buffer_bytes = 0;
2235 }
2236 mutex_unlock(&STp->lock);
2237
2238 return retval;
2239}
2240
2241
2242
2243DEB(
2244/* Set the driver options */
2245static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2246{
2247 if (debugging) {
2248 st_printk(KERN_INFO, STp,
2249 "Mode %d options: buffer writes: %d, "
2250 "async writes: %d, read ahead: %d\n",
2251 STp->current_mode, STm->do_buffer_writes,
2252 STm->do_async_writes, STm->do_read_ahead);
2253 st_printk(KERN_INFO, STp,
2254 " can bsr: %d, two FMs: %d, "
2255 "fast mteom: %d, auto lock: %d,\n",
2256 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2257 STp->do_auto_lock);
2258 st_printk(KERN_INFO, STp,
2259 " defs for wr: %d, no block limits: %d, "
2260 "partitions: %d, s2 log: %d\n",
2261 STm->defaults_for_writes, STp->omit_blklims,
2262 STp->can_partitions, STp->scsi2_logical);
2263 st_printk(KERN_INFO, STp,
2264 " sysv: %d nowait: %d sili: %d "
2265 "nowait_filemark: %d\n",
2266 STm->sysv, STp->immediate, STp->sili,
2267 STp->immediate_filemark);
2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2269 }
2270}
2271 )
2272
2273
2274static int st_set_options(struct scsi_tape *STp, long options)
2275{
2276 int value;
2277 long code;
2278 struct st_modedef *STm;
2279 struct cdev *cd0, *cd1;
2280 struct device *d0, *d1;
2281
2282 STm = &(STp->modes[STp->current_mode]);
2283 if (!STm->defined) {
2284 cd0 = STm->cdevs[0];
2285 cd1 = STm->cdevs[1];
2286 d0 = STm->devs[0];
2287 d1 = STm->devs[1];
2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2289 STm->cdevs[0] = cd0;
2290 STm->cdevs[1] = cd1;
2291 STm->devs[0] = d0;
2292 STm->devs[1] = d1;
2293 modes_defined = 1;
2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2295 STp->current_mode);
2296 }
2297
2298 code = options & MT_ST_OPTIONS;
2299 if (code == MT_ST_BOOLEANS) {
2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2309 if ((STp->device)->scsi_level >= SCSI_2)
2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2312 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2314 STm->sysv = (options & MT_ST_SYSV) != 0;
2315 STp->sili = (options & MT_ST_SILI) != 0;
2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2317 st_log_options(STp, STm); )
2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2319 value = (code == MT_ST_SETBOOLEANS);
2320 if ((options & MT_ST_BUFFER_WRITES) != 0)
2321 STm->do_buffer_writes = value;
2322 if ((options & MT_ST_ASYNC_WRITES) != 0)
2323 STm->do_async_writes = value;
2324 if ((options & MT_ST_DEF_WRITES) != 0)
2325 STm->defaults_for_writes = value;
2326 if ((options & MT_ST_READ_AHEAD) != 0)
2327 STm->do_read_ahead = value;
2328 if ((options & MT_ST_TWO_FM) != 0)
2329 STp->two_fm = value;
2330 if ((options & MT_ST_FAST_MTEOM) != 0)
2331 STp->fast_mteom = value;
2332 if ((options & MT_ST_AUTO_LOCK) != 0)
2333 STp->do_auto_lock = value;
2334 if ((options & MT_ST_CAN_BSR) != 0)
2335 STp->can_bsr = value;
2336 if ((options & MT_ST_NO_BLKLIMS) != 0)
2337 STp->omit_blklims = value;
2338 if ((STp->device)->scsi_level >= SCSI_2 &&
2339 (options & MT_ST_CAN_PARTITIONS) != 0)
2340 STp->can_partitions = value;
2341 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2342 STp->scsi2_logical = value;
2343 if ((options & MT_ST_NOWAIT) != 0)
2344 STp->immediate = value;
2345 if ((options & MT_ST_NOWAIT_EOF) != 0)
2346 STp->immediate_filemark = value;
2347 if ((options & MT_ST_SYSV) != 0)
2348 STm->sysv = value;
2349 if ((options & MT_ST_SILI) != 0)
2350 STp->sili = value;
2351 DEB(
2352 if ((options & MT_ST_DEBUGGING) != 0)
2353 debugging = value;
2354 st_log_options(STp, STm); )
2355 } else if (code == MT_ST_WRITE_THRESHOLD) {
2356 /* Retained for compatibility */
2357 } else if (code == MT_ST_DEF_BLKSIZE) {
2358 value = (options & ~MT_ST_OPTIONS);
2359 if (value == ~MT_ST_OPTIONS) {
2360 STm->default_blksize = (-1);
2361 DEBC_printk(STp, "Default block size disabled.\n");
2362 } else {
2363 STm->default_blksize = value;
2364 DEBC_printk(STp,"Default block size set to "
2365 "%d bytes.\n", STm->default_blksize);
2366 if (STp->ready == ST_READY) {
2367 STp->blksize_changed = 0;
2368 set_mode_densblk(STp, STm);
2369 }
2370 }
2371 } else if (code == MT_ST_TIMEOUTS) {
2372 value = (options & ~MT_ST_OPTIONS);
2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2376 (value & ~MT_ST_SET_LONG_TIMEOUT));
2377 } else {
2378 blk_queue_rq_timeout(STp->device->request_queue,
2379 value * HZ);
2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2381 value);
2382 }
2383 } else if (code == MT_ST_SET_CLN) {
2384 value = (options & ~MT_ST_OPTIONS) & 0xff;
2385 if (value != 0 &&
2386 (value < EXTENDED_SENSE_START ||
2387 value >= SCSI_SENSE_BUFFERSIZE))
2388 return (-EINVAL);
2389 STp->cln_mode = value;
2390 STp->cln_sense_mask = (options >> 8) & 0xff;
2391 STp->cln_sense_value = (options >> 16) & 0xff;
2392 st_printk(KERN_INFO, STp,
2393 "Cleaning request mode %d, mask %02x, value %02x\n",
2394 value, STp->cln_sense_mask, STp->cln_sense_value);
2395 } else if (code == MT_ST_DEF_OPTIONS) {
2396 code = (options & ~MT_ST_CLEAR_DEFAULT);
2397 value = (options & MT_ST_CLEAR_DEFAULT);
2398 if (code == MT_ST_DEF_DENSITY) {
2399 if (value == MT_ST_CLEAR_DEFAULT) {
2400 STm->default_density = (-1);
2401 DEBC_printk(STp,
2402 "Density default disabled.\n");
2403 } else {
2404 STm->default_density = value & 0xff;
2405 DEBC_printk(STp, "Density default set to %x\n",
2406 STm->default_density);
2407 if (STp->ready == ST_READY) {
2408 STp->density_changed = 0;
2409 set_mode_densblk(STp, STm);
2410 }
2411 }
2412 } else if (code == MT_ST_DEF_DRVBUFFER) {
2413 if (value == MT_ST_CLEAR_DEFAULT) {
2414 STp->default_drvbuffer = 0xff;
2415 DEBC_printk(STp,
2416 "Drive buffer default disabled.\n");
2417 } else {
2418 STp->default_drvbuffer = value & 7;
2419 DEBC_printk(STp,
2420 "Drive buffer default set to %x\n",
2421 STp->default_drvbuffer);
2422 if (STp->ready == ST_READY)
2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2424 }
2425 } else if (code == MT_ST_DEF_COMPRESSION) {
2426 if (value == MT_ST_CLEAR_DEFAULT) {
2427 STm->default_compression = ST_DONT_TOUCH;
2428 DEBC_printk(STp,
2429 "Compression default disabled.\n");
2430 } else {
2431 if ((value & 0xff00) != 0) {
2432 STp->c_algo = (value & 0xff00) >> 8;
2433 DEBC_printk(STp, "Compression "
2434 "algorithm set to 0x%x.\n",
2435 STp->c_algo);
2436 }
2437 if ((value & 0xff) != 0xff) {
2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2439 DEBC_printk(STp, "Compression default "
2440 "set to %x\n",
2441 (value & 1));
2442 if (STp->ready == ST_READY) {
2443 STp->compression_changed = 0;
2444 st_compression(STp, (STm->default_compression == ST_YES));
2445 }
2446 }
2447 }
2448 }
2449 } else
2450 return (-EIO);
2451
2452 return 0;
2453}
2454
2455#define MODE_HEADER_LENGTH 4
2456
2457/* Mode header and page byte offsets */
2458#define MH_OFF_DATA_LENGTH 0
2459#define MH_OFF_MEDIUM_TYPE 1
2460#define MH_OFF_DEV_SPECIFIC 2
2461#define MH_OFF_BDESCS_LENGTH 3
2462#define MP_OFF_PAGE_NBR 0
2463#define MP_OFF_PAGE_LENGTH 1
2464
2465/* Mode header and page bit masks */
2466#define MH_BIT_WP 0x80
2467#define MP_MSK_PAGE_NBR 0x3f
2468
2469/* Don't return block descriptors */
2470#define MODE_SENSE_OMIT_BDESCS 0x08
2471
2472#define MODE_SELECT_PAGE_FORMAT 0x10
2473
2474/* Read a mode page into the tape buffer. The block descriptors are included
2475 if incl_block_descs is true. The page control is ored to the page number
2476 parameter, if necessary. */
2477static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2478{
2479 unsigned char cmd[MAX_COMMAND_SIZE];
2480 struct st_request *SRpnt;
2481
2482 memset(cmd, 0, MAX_COMMAND_SIZE);
2483 cmd[0] = MODE_SENSE;
2484 if (omit_block_descs)
2485 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2486 cmd[2] = page;
2487 cmd[4] = 255;
2488
2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2490 STp->device->request_queue->rq_timeout, 0, 1);
2491 if (SRpnt == NULL)
2492 return (STp->buffer)->syscall_result;
2493
2494 st_release_request(SRpnt);
2495
2496 return STp->buffer->syscall_result;
2497}
2498
2499
2500/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2502static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2503{
2504 int pgo;
2505 unsigned char cmd[MAX_COMMAND_SIZE];
2506 struct st_request *SRpnt;
2507 int timeout;
2508
2509 memset(cmd, 0, MAX_COMMAND_SIZE);
2510 cmd[0] = MODE_SELECT;
2511 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2514
2515 /* Clear reserved fields */
2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2520
2521 timeout = slow ?
2522 STp->long_timeout : STp->device->request_queue->rq_timeout;
2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2524 timeout, 0, 1);
2525 if (SRpnt == NULL)
2526 return (STp->buffer)->syscall_result;
2527
2528 st_release_request(SRpnt);
2529
2530 return STp->buffer->syscall_result;
2531}
2532
2533
2534#define COMPRESSION_PAGE 0x0f
2535#define COMPRESSION_PAGE_LENGTH 16
2536
2537#define CP_OFF_DCE_DCC 2
2538#define CP_OFF_C_ALGO 7
2539
2540#define DCE_MASK 0x80
2541#define DCC_MASK 0x40
2542#define RED_MASK 0x60
2543
2544
2545/* Control the compression with mode page 15. Algorithm not changed if zero.
2546
2547 The block descriptors are read and written because Sony SDT-7000 does not
2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2549 Including block descriptors should not cause any harm to other drives. */
2550
2551static int st_compression(struct scsi_tape * STp, int state)
2552{
2553 int retval;
2554 int mpoffs; /* Offset to mode page start */
2555 unsigned char *b_data = (STp->buffer)->b_data;
2556
2557 if (STp->ready != ST_READY)
2558 return (-EIO);
2559
2560 /* Read the current page contents */
2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2562 if (retval) {
2563 DEBC_printk(STp, "Compression mode page not supported.\n");
2564 return (-EIO);
2565 }
2566
2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2568 DEBC_printk(STp, "Compression state is %d.\n",
2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2570
2571 /* Check if compression can be changed */
2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2573 DEBC_printk(STp, "Compression not supported.\n");
2574 return (-EIO);
2575 }
2576
2577 /* Do the change */
2578 if (state) {
2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2580 if (STp->c_algo != 0)
2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2582 }
2583 else {
2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2585 if (STp->c_algo != 0)
2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2587 }
2588
2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2590 if (retval) {
2591 DEBC_printk(STp, "Compression change failed.\n");
2592 return (-EIO);
2593 }
2594 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2595
2596 STp->compression_changed = 1;
2597 return 0;
2598}
2599
2600
2601/* Process the load and unload commands (does unload if the load code is zero) */
2602static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2603{
2604 int retval = (-EIO), timeout;
2605 unsigned char cmd[MAX_COMMAND_SIZE];
2606 struct st_partstat *STps;
2607 struct st_request *SRpnt;
2608
2609 if (STp->ready != ST_READY && !load_code) {
2610 if (STp->ready == ST_NO_TAPE)
2611 return (-ENOMEDIUM);
2612 else
2613 return (-EIO);
2614 }
2615
2616 memset(cmd, 0, MAX_COMMAND_SIZE);
2617 cmd[0] = START_STOP;
2618 if (load_code)
2619 cmd[4] |= 1;
2620 /*
2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2622 */
2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2626 (cmd[4]) ? "" : "un",
2627 load_code - MT_ST_HPLOADER_OFFSET);
2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2629 }
2630 if (STp->immediate) {
2631 cmd[1] = 1; /* Don't wait for completion */
2632 timeout = STp->device->request_queue->rq_timeout;
2633 }
2634 else
2635 timeout = STp->long_timeout;
2636
2637 DEBC(
2638 if (!load_code)
2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2640 else
2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2642 );
2643
2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2645 timeout, MAX_RETRIES, 1);
2646 if (!SRpnt)
2647 return (STp->buffer)->syscall_result;
2648
2649 retval = (STp->buffer)->syscall_result;
2650 st_release_request(SRpnt);
2651
2652 if (!retval) { /* SCSI command successful */
2653
2654 if (!load_code) {
2655 STp->rew_at_close = 0;
2656 STp->ready = ST_NO_TAPE;
2657 }
2658 else {
2659 STp->rew_at_close = STp->autorew_dev;
2660 retval = check_tape(STp, filp);
2661 if (retval > 0)
2662 retval = 0;
2663 }
2664 }
2665 else {
2666 STps = &(STp->ps[STp->partition]);
2667 STps->drv_file = STps->drv_block = (-1);
2668 }
2669
2670 return retval;
2671}
2672
2673#if DEBUG
2674#define ST_DEB_FORWARD 0
2675#define ST_DEB_BACKWARD 1
2676static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2677{
2678 s32 sc;
2679
2680 if (!debugging)
2681 return;
2682
2683 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
2684 if (direction)
2685 sc = -sc;
2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2687 direction ? "backward" : "forward", sc, units);
2688}
2689#else
2690#define ST_DEB_FORWARD 0
2691#define ST_DEB_BACKWARD 1
2692static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2693#endif
2694
2695
2696/* Internal ioctl function */
2697static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2698{
2699 int timeout;
2700 long ltmp;
2701 int ioctl_result;
2702 int chg_eof = 1;
2703 unsigned char cmd[MAX_COMMAND_SIZE];
2704 struct st_request *SRpnt;
2705 struct st_partstat *STps;
2706 int fileno, blkno, at_sm, undone;
2707 int datalen = 0, direction = DMA_NONE;
2708
2709 WARN_ON(STp->buffer->do_dio != 0);
2710 if (STp->ready != ST_READY) {
2711 if (STp->ready == ST_NO_TAPE)
2712 return (-ENOMEDIUM);
2713 else
2714 return (-EIO);
2715 }
2716 timeout = STp->long_timeout;
2717 STps = &(STp->ps[STp->partition]);
2718 fileno = STps->drv_file;
2719 blkno = STps->drv_block;
2720 at_sm = STps->at_sm;
2721
2722 memset(cmd, 0, MAX_COMMAND_SIZE);
2723 switch (cmd_in) {
2724 case MTFSFM:
2725 chg_eof = 0; /* Changed from the FSF after this */
2726 fallthrough;
2727 case MTFSF:
2728 cmd[0] = SPACE;
2729 cmd[1] = 0x01; /* Space FileMarks */
2730 cmd[2] = (arg >> 16);
2731 cmd[3] = (arg >> 8);
2732 cmd[4] = arg;
2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2734 if (fileno >= 0)
2735 fileno += arg;
2736 blkno = 0;
2737 at_sm &= (arg == 0);
2738 break;
2739 case MTBSFM:
2740 chg_eof = 0; /* Changed from the FSF after this */
2741 fallthrough;
2742 case MTBSF:
2743 cmd[0] = SPACE;
2744 cmd[1] = 0x01; /* Space FileMarks */
2745 ltmp = (-arg);
2746 cmd[2] = (ltmp >> 16);
2747 cmd[3] = (ltmp >> 8);
2748 cmd[4] = ltmp;
2749 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2750 if (fileno >= 0)
2751 fileno -= arg;
2752 blkno = (-1); /* We can't know the block number */
2753 at_sm &= (arg == 0);
2754 break;
2755 case MTFSR:
2756 cmd[0] = SPACE;
2757 cmd[1] = 0x00; /* Space Blocks */
2758 cmd[2] = (arg >> 16);
2759 cmd[3] = (arg >> 8);
2760 cmd[4] = arg;
2761 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2762 if (blkno >= 0)
2763 blkno += arg;
2764 at_sm &= (arg == 0);
2765 break;
2766 case MTBSR:
2767 cmd[0] = SPACE;
2768 cmd[1] = 0x00; /* Space Blocks */
2769 ltmp = (-arg);
2770 cmd[2] = (ltmp >> 16);
2771 cmd[3] = (ltmp >> 8);
2772 cmd[4] = ltmp;
2773 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2774 if (blkno >= 0)
2775 blkno -= arg;
2776 at_sm &= (arg == 0);
2777 break;
2778 case MTFSS:
2779 cmd[0] = SPACE;
2780 cmd[1] = 0x04; /* Space Setmarks */
2781 cmd[2] = (arg >> 16);
2782 cmd[3] = (arg >> 8);
2783 cmd[4] = arg;
2784 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2785 if (arg != 0) {
2786 blkno = fileno = (-1);
2787 at_sm = 1;
2788 }
2789 break;
2790 case MTBSS:
2791 cmd[0] = SPACE;
2792 cmd[1] = 0x04; /* Space Setmarks */
2793 ltmp = (-arg);
2794 cmd[2] = (ltmp >> 16);
2795 cmd[3] = (ltmp >> 8);
2796 cmd[4] = ltmp;
2797 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2798 if (arg != 0) {
2799 blkno = fileno = (-1);
2800 at_sm = 1;
2801 }
2802 break;
2803 case MTWEOF:
2804 case MTWEOFI:
2805 case MTWSM:
2806 if (STp->write_prot)
2807 return (-EACCES);
2808 cmd[0] = WRITE_FILEMARKS;
2809 if (cmd_in == MTWSM)
2810 cmd[1] = 2;
2811 if (cmd_in == MTWEOFI ||
2812 (cmd_in == MTWEOF && STp->immediate_filemark))
2813 cmd[1] |= 1;
2814 cmd[2] = (arg >> 16);
2815 cmd[3] = (arg >> 8);
2816 cmd[4] = arg;
2817 timeout = STp->device->request_queue->rq_timeout;
2818 DEBC(
2819 if (cmd_in != MTWSM)
2820 st_printk(ST_DEB_MSG, STp,
2821 "Writing %d filemarks.\n",
2822 cmd[2] * 65536 +
2823 cmd[3] * 256 +
2824 cmd[4]);
2825 else
2826 st_printk(ST_DEB_MSG, STp,
2827 "Writing %d setmarks.\n",
2828 cmd[2] * 65536 +
2829 cmd[3] * 256 +
2830 cmd[4]);
2831 )
2832 if (fileno >= 0)
2833 fileno += arg;
2834 blkno = 0;
2835 at_sm = (cmd_in == MTWSM);
2836 break;
2837 case MTREW:
2838 cmd[0] = REZERO_UNIT;
2839 if (STp->immediate) {
2840 cmd[1] = 1; /* Don't wait for completion */
2841 timeout = STp->device->request_queue->rq_timeout;
2842 }
2843 DEBC_printk(STp, "Rewinding tape.\n");
2844 fileno = blkno = at_sm = 0;
2845 break;
2846 case MTNOP:
2847 DEBC_printk(STp, "No op on tape.\n");
2848 return 0; /* Should do something ? */
2849 break;
2850 case MTRETEN:
2851 cmd[0] = START_STOP;
2852 if (STp->immediate) {
2853 cmd[1] = 1; /* Don't wait for completion */
2854 timeout = STp->device->request_queue->rq_timeout;
2855 }
2856 cmd[4] = 3;
2857 DEBC_printk(STp, "Retensioning tape.\n");
2858 fileno = blkno = at_sm = 0;
2859 break;
2860 case MTEOM:
2861 if (!STp->fast_mteom) {
2862 /* space to the end of tape */
2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2864 fileno = STps->drv_file;
2865 if (STps->eof >= ST_EOD_1)
2866 return 0;
2867 /* The next lines would hide the number of spaced FileMarks
2868 That's why I inserted the previous lines. I had no luck
2869 with detecting EOM with FSF, so we go now to EOM.
2870 Joerg Weule */
2871 } else
2872 fileno = (-1);
2873 cmd[0] = SPACE;
2874 cmd[1] = 3;
2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2876 blkno = -1;
2877 at_sm = 0;
2878 break;
2879 case MTERASE:
2880 if (STp->write_prot)
2881 return (-EACCES);
2882 cmd[0] = ERASE;
2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2884 if (STp->immediate) {
2885 cmd[1] |= 2; /* Don't wait for completion */
2886 timeout = STp->device->request_queue->rq_timeout;
2887 }
2888 else
2889 timeout = STp->long_timeout * 8;
2890
2891 DEBC_printk(STp, "Erasing tape.\n");
2892 fileno = blkno = at_sm = 0;
2893 break;
2894 case MTSETBLK: /* Set block length */
2895 case MTSETDENSITY: /* Set tape density */
2896 case MTSETDRVBUFFER: /* Set drive buffering */
2897 case SET_DENS_AND_BLK: /* Set density and block size */
2898 chg_eof = 0;
2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2900 return (-EIO); /* Not allowed if data in buffer */
2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2902 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2903 STp->max_block > 0 &&
2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2907 return (-EINVAL);
2908 }
2909 cmd[0] = MODE_SELECT;
2910 if ((STp->use_pf & USE_PF))
2911 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2912 cmd[4] = datalen = 12;
2913 direction = DMA_TO_DEVICE;
2914
2915 memset((STp->buffer)->b_data, 0, 12);
2916 if (cmd_in == MTSETDRVBUFFER)
2917 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2918 else
2919 (STp->buffer)->b_data[2] =
2920 STp->drv_buffer << 4;
2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2922 if (cmd_in == MTSETDENSITY) {
2923 (STp->buffer)->b_data[4] = arg;
2924 STp->density_changed = 1; /* At least we tried ;-) */
2925 } else if (cmd_in == SET_DENS_AND_BLK)
2926 (STp->buffer)->b_data[4] = arg >> 24;
2927 else
2928 (STp->buffer)->b_data[4] = STp->density;
2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2930 ltmp = arg & MT_ST_BLKSIZE_MASK;
2931 if (cmd_in == MTSETBLK)
2932 STp->blksize_changed = 1; /* At least we tried ;-) */
2933 } else
2934 ltmp = STp->block_size;
2935 (STp->buffer)->b_data[9] = (ltmp >> 16);
2936 (STp->buffer)->b_data[10] = (ltmp >> 8);
2937 (STp->buffer)->b_data[11] = ltmp;
2938 timeout = STp->device->request_queue->rq_timeout;
2939 DEBC(
2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2941 st_printk(ST_DEB_MSG, STp,
2942 "Setting block size to %d bytes.\n",
2943 (STp->buffer)->b_data[9] * 65536 +
2944 (STp->buffer)->b_data[10] * 256 +
2945 (STp->buffer)->b_data[11]);
2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2947 st_printk(ST_DEB_MSG, STp,
2948 "Setting density code to %x.\n",
2949 (STp->buffer)->b_data[4]);
2950 if (cmd_in == MTSETDRVBUFFER)
2951 st_printk(ST_DEB_MSG, STp,
2952 "Setting drive buffer code to %d.\n",
2953 ((STp->buffer)->b_data[2] >> 4) & 7);
2954 )
2955 break;
2956 default:
2957 return (-ENOSYS);
2958 }
2959
2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2961 timeout, MAX_RETRIES, 1);
2962 if (!SRpnt)
2963 return (STp->buffer)->syscall_result;
2964
2965 ioctl_result = (STp->buffer)->syscall_result;
2966
2967 if (!ioctl_result) { /* SCSI command successful */
2968 st_release_request(SRpnt);
2969 SRpnt = NULL;
2970 STps->drv_block = blkno;
2971 STps->drv_file = fileno;
2972 STps->at_sm = at_sm;
2973
2974 if (cmd_in == MTBSFM)
2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2976 else if (cmd_in == MTFSFM)
2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2978
2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2981 if (STp->block_size != 0) {
2982 (STp->buffer)->buffer_blocks =
2983 (STp->buffer)->buffer_size / STp->block_size;
2984 }
2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2986 if (cmd_in == SET_DENS_AND_BLK)
2987 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2988 } else if (cmd_in == MTSETDRVBUFFER)
2989 STp->drv_buffer = (arg & 7);
2990 else if (cmd_in == MTSETDENSITY)
2991 STp->density = arg;
2992
2993 if (cmd_in == MTEOM)
2994 STps->eof = ST_EOD;
2995 else if (cmd_in == MTFSF)
2996 STps->eof = ST_FM;
2997 else if (chg_eof)
2998 STps->eof = ST_NOEOF;
2999
3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3002 } else { /* SCSI command was not completely successful. Don't return
3003 from this block without releasing the SCSI command block! */
3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3005
3006 if (cmdstatp->flags & SENSE_EOM) {
3007 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3008 cmd_in != MTBSR && cmd_in != MTBSS)
3009 STps->eof = ST_EOM_OK;
3010 STps->drv_block = 0;
3011 }
3012
3013 if (cmdstatp->remainder_valid)
3014 undone = (int)cmdstatp->uremainder64;
3015 else
3016 undone = 0;
3017
3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3019 cmdstatp->have_sense &&
3020 (cmdstatp->flags & SENSE_EOM)) {
3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3024 STps->eof = ST_NOEOF;
3025 } else { /* Writing EOF(s) failed */
3026 if (fileno >= 0)
3027 fileno -= undone;
3028 if (undone < arg)
3029 STps->eof = ST_NOEOF;
3030 }
3031 STps->drv_file = fileno;
3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3033 if (fileno >= 0)
3034 STps->drv_file = fileno - undone;
3035 else
3036 STps->drv_file = fileno;
3037 STps->drv_block = -1;
3038 STps->eof = ST_NOEOF;
3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3041 undone = (-undone);
3042 if (STps->drv_file >= 0)
3043 STps->drv_file = fileno + undone;
3044 STps->drv_block = 0;
3045 STps->eof = ST_NOEOF;
3046 } else if (cmd_in == MTFSR) {
3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3048 if (STps->drv_file >= 0)
3049 STps->drv_file++;
3050 STps->drv_block = 0;
3051 STps->eof = ST_FM;
3052 } else {
3053 if (blkno >= undone)
3054 STps->drv_block = blkno - undone;
3055 else
3056 STps->drv_block = (-1);
3057 STps->eof = ST_NOEOF;
3058 }
3059 } else if (cmd_in == MTBSR) {
3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3061 STps->drv_file--;
3062 STps->drv_block = (-1);
3063 } else {
3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3065 undone = (-undone);
3066 if (STps->drv_block >= 0)
3067 STps->drv_block = blkno + undone;
3068 }
3069 STps->eof = ST_NOEOF;
3070 } else if (cmd_in == MTEOM) {
3071 STps->drv_file = (-1);
3072 STps->drv_block = (-1);
3073 STps->eof = ST_EOD;
3074 } else if (cmd_in == MTSETBLK ||
3075 cmd_in == MTSETDENSITY ||
3076 cmd_in == MTSETDRVBUFFER ||
3077 cmd_in == SET_DENS_AND_BLK) {
3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3079 !(STp->use_pf & PF_TESTED)) {
3080 /* Try the other possible state of Page Format if not
3081 already tried */
3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3083 st_release_request(SRpnt);
3084 SRpnt = NULL;
3085 return st_int_ioctl(STp, cmd_in, arg);
3086 }
3087 } else if (chg_eof)
3088 STps->eof = ST_NOEOF;
3089
3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3091 STps->eof = ST_EOD;
3092
3093 st_release_request(SRpnt);
3094 SRpnt = NULL;
3095 }
3096
3097 return ioctl_result;
3098}
3099
3100
3101/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3102 structure. */
3103
3104static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3105 int logical)
3106{
3107 int result;
3108 unsigned char scmd[MAX_COMMAND_SIZE];
3109 struct st_request *SRpnt;
3110
3111 if (STp->ready != ST_READY)
3112 return (-EIO);
3113
3114 memset(scmd, 0, MAX_COMMAND_SIZE);
3115 if ((STp->device)->scsi_level < SCSI_2) {
3116 scmd[0] = QFA_REQUEST_BLOCK;
3117 scmd[4] = 3;
3118 } else {
3119 scmd[0] = READ_POSITION;
3120 if (!logical && !STp->scsi2_logical)
3121 scmd[1] = 1;
3122 }
3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3124 STp->device->request_queue->rq_timeout,
3125 MAX_READY_RETRIES, 1);
3126 if (!SRpnt)
3127 return (STp->buffer)->syscall_result;
3128
3129 if ((STp->buffer)->syscall_result != 0 ||
3130 (STp->device->scsi_level >= SCSI_2 &&
3131 ((STp->buffer)->b_data[0] & 4) != 0)) {
3132 *block = *partition = 0;
3133 DEBC_printk(STp, " Can't read tape position.\n");
3134 result = (-EIO);
3135 } else {
3136 result = 0;
3137 if ((STp->device)->scsi_level < SCSI_2) {
3138 *block = ((STp->buffer)->b_data[0] << 16)
3139 + ((STp->buffer)->b_data[1] << 8)
3140 + (STp->buffer)->b_data[2];
3141 *partition = 0;
3142 } else {
3143 *block = ((STp->buffer)->b_data[4] << 24)
3144 + ((STp->buffer)->b_data[5] << 16)
3145 + ((STp->buffer)->b_data[6] << 8)
3146 + (STp->buffer)->b_data[7];
3147 *partition = (STp->buffer)->b_data[1];
3148 if (((STp->buffer)->b_data[0] & 0x80) &&
3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3151 }
3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3153 *block, *partition);
3154 }
3155 st_release_request(SRpnt);
3156 SRpnt = NULL;
3157
3158 return result;
3159}
3160
3161
3162/* Set the tape block and partition. Negative partition means that only the
3163 block should be set in vendor specific way. */
3164static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3165 int logical)
3166{
3167 struct st_partstat *STps;
3168 int result, p;
3169 unsigned int blk;
3170 int timeout;
3171 unsigned char scmd[MAX_COMMAND_SIZE];
3172 struct st_request *SRpnt;
3173
3174 if (STp->ready != ST_READY)
3175 return (-EIO);
3176 timeout = STp->long_timeout;
3177 STps = &(STp->ps[STp->partition]);
3178
3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3180 block, partition);
3181 DEB(if (partition < 0)
3182 return (-EIO); )
3183
3184 /* Update the location at the partition we are leaving */
3185 if ((!STp->can_partitions && partition != 0) ||
3186 partition >= ST_NBR_PARTITIONS)
3187 return (-EINVAL);
3188 if (partition != STp->partition) {
3189 if (get_location(STp, &blk, &p, 1))
3190 STps->last_block_valid = 0;
3191 else {
3192 STps->last_block_valid = 1;
3193 STps->last_block_visited = blk;
3194 DEBC_printk(STp, "Visited block %d for "
3195 "partition %d saved.\n",
3196 blk, STp->partition);
3197 }
3198 }
3199
3200 memset(scmd, 0, MAX_COMMAND_SIZE);
3201 if ((STp->device)->scsi_level < SCSI_2) {
3202 scmd[0] = QFA_SEEK_BLOCK;
3203 scmd[2] = (block >> 16);
3204 scmd[3] = (block >> 8);
3205 scmd[4] = block;
3206 scmd[5] = 0;
3207 } else {
3208 scmd[0] = SEEK_10;
3209 scmd[3] = (block >> 24);
3210 scmd[4] = (block >> 16);
3211 scmd[5] = (block >> 8);
3212 scmd[6] = block;
3213 if (!logical && !STp->scsi2_logical)
3214 scmd[1] = 4;
3215 if (STp->partition != partition) {
3216 scmd[1] |= 2;
3217 scmd[8] = partition;
3218 DEBC_printk(STp, "Trying to change partition "
3219 "from %d to %d\n", STp->partition,
3220 partition);
3221 }
3222 }
3223 if (STp->immediate) {
3224 scmd[1] |= 1; /* Don't wait for completion */
3225 timeout = STp->device->request_queue->rq_timeout;
3226 }
3227
3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3229 timeout, MAX_READY_RETRIES, 1);
3230 if (!SRpnt)
3231 return (STp->buffer)->syscall_result;
3232
3233 STps->drv_block = STps->drv_file = (-1);
3234 STps->eof = ST_NOEOF;
3235 if ((STp->buffer)->syscall_result != 0) {
3236 result = (-EIO);
3237 if (STp->can_partitions &&
3238 (STp->device)->scsi_level >= SCSI_2 &&
3239 (p = find_partition(STp)) >= 0)
3240 STp->partition = p;
3241 } else {
3242 if (STp->can_partitions) {
3243 STp->partition = partition;
3244 STps = &(STp->ps[partition]);
3245 if (!STps->last_block_valid ||
3246 STps->last_block_visited != block) {
3247 STps->at_sm = 0;
3248 STps->rw = ST_IDLE;
3249 }
3250 } else
3251 STps->at_sm = 0;
3252 if (block == 0)
3253 STps->drv_block = STps->drv_file = 0;
3254 result = 0;
3255 }
3256
3257 st_release_request(SRpnt);
3258 SRpnt = NULL;
3259
3260 return result;
3261}
3262
3263
3264/* Find the current partition number for the drive status. Called from open and
3265 returns either partition number of negative error code. */
3266static int find_partition(struct scsi_tape *STp)
3267{
3268 int i, partition;
3269 unsigned int block;
3270
3271 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3272 return i;
3273 if (partition >= ST_NBR_PARTITIONS)
3274 return (-EIO);
3275 return partition;
3276}
3277
3278
3279/* Change the partition if necessary */
3280static int switch_partition(struct scsi_tape *STp)
3281{
3282 struct st_partstat *STps;
3283
3284 if (STp->partition == STp->new_partition)
3285 return 0;
3286 STps = &(STp->ps[STp->new_partition]);
3287 if (!STps->last_block_valid)
3288 STps->last_block_visited = 0;
3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3290}
3291
3292/* Functions for reading and writing the medium partition mode page. */
3293
3294#define PART_PAGE 0x11
3295#define PART_PAGE_FIXED_LENGTH 8
3296
3297#define PP_OFF_MAX_ADD_PARTS 2
3298#define PP_OFF_NBR_ADD_PARTS 3
3299#define PP_OFF_FLAGS 4
3300#define PP_OFF_PART_UNITS 6
3301#define PP_OFF_RESERVED 7
3302
3303#define PP_BIT_IDP 0x20
3304#define PP_BIT_FDP 0x80
3305#define PP_MSK_PSUM_MB 0x10
3306#define PP_MSK_PSUM_UNITS 0x18
3307#define PP_MSK_POFM 0x04
3308
3309/* Get the number of partitions on the tape. As a side effect reads the
3310 mode page into the tape buffer. */
3311static int nbr_partitions(struct scsi_tape *STp)
3312{
3313 int result;
3314
3315 if (STp->ready != ST_READY)
3316 return (-EIO);
3317
3318 result = read_mode_page(STp, PART_PAGE, 1);
3319
3320 if (result) {
3321 DEBC_printk(STp, "Can't read medium partition page.\n");
3322 result = (-EIO);
3323 } else {
3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3325 PP_OFF_NBR_ADD_PARTS] + 1;
3326 DEBC_printk(STp, "Number of partitions %d.\n", result);
3327 }
3328
3329 return result;
3330}
3331
3332
3333static int format_medium(struct scsi_tape *STp, int format)
3334{
3335 int result = 0;
3336 int timeout = STp->long_timeout;
3337 unsigned char scmd[MAX_COMMAND_SIZE];
3338 struct st_request *SRpnt;
3339
3340 memset(scmd, 0, MAX_COMMAND_SIZE);
3341 scmd[0] = FORMAT_UNIT;
3342 scmd[2] = format;
3343 if (STp->immediate) {
3344 scmd[1] |= 1; /* Don't wait for completion */
3345 timeout = STp->device->request_queue->rq_timeout;
3346 }
3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3349 timeout, MAX_RETRIES, 1);
3350 if (!SRpnt)
3351 result = STp->buffer->syscall_result;
3352 return result;
3353}
3354
3355
3356/* Partition the tape into two partitions if size > 0 or one partition if
3357 size == 0.
3358
3359 The block descriptors are read and written because Sony SDT-7000 does not
3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3361
3362 My HP C1533A drive returns only one partition size field. This is used to
3363 set the size of partition 1. There is no size field for the default partition.
3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3366 The following algorithm is used to accommodate both drives: if the number of
3367 partition size fields is greater than the maximum number of additional partitions
3368 in the mode page, the second field is used. Otherwise the first field is used.
3369
3370 For Seagate DDS drives the page length must be 8 when no partitions is defined
3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3372 is acceptable also to some other old drives and enforced if the first partition
3373 size field is used for the first additional partition size.
3374
3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3376 */
3377static int partition_tape(struct scsi_tape *STp, int size)
3378{
3379 int result;
3380 int target_partition;
3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3382 int pgo, psd_cnt, psdo;
3383 int psum = PP_MSK_PSUM_MB, units = 0;
3384 unsigned char *bp;
3385
3386 result = read_mode_page(STp, PART_PAGE, 0);
3387 if (result) {
3388 DEBC_printk(STp, "Can't read partition mode page.\n");
3389 return result;
3390 }
3391 target_partition = 1;
3392 if (size < 0) {
3393 target_partition = 0;
3394 size = -size;
3395 }
3396
3397 /* The mode page is in the buffer. Let's modify it and write it. */
3398 bp = (STp->buffer)->b_data;
3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3400 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3402
3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3404
3405 if (scsi3) {
3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3407 if (needs_format && size == 0) {
3408 /* No need to write the mode page when clearing
3409 * partitioning
3410 */
3411 DEBC_printk(STp, "Formatting tape with one partition.\n");
3412 result = format_medium(STp, 0);
3413 goto out;
3414 }
3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3416 psd_cnt = 2;
3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3418 /* Use units scaling for large partitions if the device
3419 * suggests it and no precision lost. Required for IBM
3420 * TS1140/50 drives that don't support MB units.
3421 */
3422 if (size >= 1000 && (size % 1000) == 0) {
3423 size /= 1000;
3424 psum = PP_MSK_PSUM_UNITS;
3425 units = 9; /* GB */
3426 }
3427 }
3428 /* Try it anyway if too large to specify in MB */
3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3430 size /= 1000;
3431 psum = PP_MSK_PSUM_UNITS;
3432 units = 9; /* GB */
3433 }
3434 }
3435
3436 if (size >= 65535 || /* Does not fit into two bytes */
3437 (target_partition == 0 && psd_cnt < 2)) {
3438 result = -EINVAL;
3439 goto out;
3440 }
3441
3442 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3443 /* The second condition is for HP DDS which use only one partition size
3444 * descriptor
3445 */
3446 if (target_partition > 0 &&
3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3450 psdo += 2;
3451 }
3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3453
3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3457
3458 if (size == 0) {
3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3462 DEBC_printk(STp, "Formatting tape with one partition.\n");
3463 } else {
3464 bp[psdo] = (size >> 8) & 0xff;
3465 bp[psdo + 1] = size & 0xff;
3466 if (target_partition == 0)
3467 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3468 bp[pgo + 3] = 1;
3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3471 DEBC_printk(STp,
3472 "Formatting tape with two partitions (%i = %d MB).\n",
3473 target_partition, units > 0 ? size * 1000 : size);
3474 }
3475 bp[pgo + PP_OFF_PART_UNITS] = 0;
3476 bp[pgo + PP_OFF_RESERVED] = 0;
3477 if (size != 1 || units != 0) {
3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3479 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3480 bp[pgo + PP_OFF_PART_UNITS] = units;
3481 } else
3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3485
3486 result = write_mode_page(STp, PART_PAGE, 1);
3487
3488 if (!result && needs_format)
3489 result = format_medium(STp, 1);
3490
3491 if (result) {
3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3493 result = (-EIO);
3494 }
3495
3496out:
3497 return result;
3498}
3499
3500
3501
3502/* The ioctl command */
3503static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
3504{
3505 int i, cmd_nr, cmd_type, bt;
3506 int retval = 0;
3507 unsigned int blk;
3508 struct scsi_tape *STp = file->private_data;
3509 struct st_modedef *STm;
3510 struct st_partstat *STps;
3511
3512 if (mutex_lock_interruptible(&STp->lock))
3513 return -ERESTARTSYS;
3514
3515 DEB(
3516 if (debugging && !STp->in_use) {
3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3518 retval = (-EIO);
3519 goto out;
3520 } ) /* end DEB */
3521
3522 STm = &(STp->modes[STp->current_mode]);
3523 STps = &(STp->ps[STp->partition]);
3524
3525 /*
3526 * If we are in the middle of error recovery, don't let anyone
3527 * else try and use this device. Also, if error recovery fails, it
3528 * may try and take the device offline, in which case all further
3529 * access to the device is prohibited.
3530 */
3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3532 file->f_flags & O_NDELAY);
3533 if (retval)
3534 goto out;
3535
3536 cmd_type = _IOC_TYPE(cmd_in);
3537 cmd_nr = _IOC_NR(cmd_in);
3538
3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3540 struct mtop mtc;
3541
3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3543 retval = (-EINVAL);
3544 goto out;
3545 }
3546
3547 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3548 if (i) {
3549 retval = (-EFAULT);
3550 goto out;
3551 }
3552
3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3554 st_printk(KERN_WARNING, STp,
3555 "MTSETDRVBUFFER only allowed for root.\n");
3556 retval = (-EPERM);
3557 goto out;
3558 }
3559 if (!STm->defined &&
3560 (mtc.mt_op != MTSETDRVBUFFER &&
3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3562 retval = (-ENXIO);
3563 goto out;
3564 }
3565
3566 if (!STp->pos_unknown) {
3567
3568 if (STps->eof == ST_FM_HIT) {
3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3570 mtc.mt_op == MTEOM) {
3571 mtc.mt_count -= 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3575 mtc.mt_count += 1;
3576 if (STps->drv_file >= 0)
3577 STps->drv_file += 1;
3578 }
3579 }
3580
3581 if (mtc.mt_op == MTSEEK) {
3582 /* Old position must be restored if partition will be
3583 changed */
3584 i = !STp->can_partitions ||
3585 (STp->new_partition != STp->partition);
3586 } else {
3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3592 mtc.mt_op == MTCOMPRESSION;
3593 }
3594 i = flush_buffer(STp, i);
3595 if (i < 0) {
3596 retval = i;
3597 goto out;
3598 }
3599 if (STps->rw == ST_WRITING &&
3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3601 mtc.mt_op == MTSEEK ||
3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3603 i = st_int_ioctl(STp, MTWEOF, 1);
3604 if (i < 0) {
3605 retval = i;
3606 goto out;
3607 }
3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3609 mtc.mt_count++;
3610 STps->rw = ST_IDLE;
3611 }
3612
3613 } else {
3614 /*
3615 * If there was a bus reset, block further access
3616 * to this device. If the user wants to rewind the tape,
3617 * then reset the flag and allow access again.
3618 */
3619 if (mtc.mt_op != MTREW &&
3620 mtc.mt_op != MTOFFL &&
3621 mtc.mt_op != MTRETEN &&
3622 mtc.mt_op != MTERASE &&
3623 mtc.mt_op != MTSEEK &&
3624 mtc.mt_op != MTEOM) {
3625 retval = (-EIO);
3626 goto out;
3627 }
3628 reset_state(STp);
3629 /* remove this when the midlevel properly clears was_reset */
3630 STp->device->was_reset = 0;
3631 }
3632
3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3637
3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3639 do_door_lock(STp, 0); /* Ignore result! */
3640
3641 if (mtc.mt_op == MTSETDRVBUFFER &&
3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3643 retval = st_set_options(STp, mtc.mt_count);
3644 goto out;
3645 }
3646
3647 if (mtc.mt_op == MTSETPART) {
3648 if (!STp->can_partitions ||
3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3650 retval = (-EINVAL);
3651 goto out;
3652 }
3653 if (mtc.mt_count >= STp->nbr_partitions &&
3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3655 retval = (-EIO);
3656 goto out;
3657 }
3658 if (mtc.mt_count >= STp->nbr_partitions) {
3659 retval = (-EINVAL);
3660 goto out;
3661 }
3662 STp->new_partition = mtc.mt_count;
3663 retval = 0;
3664 goto out;
3665 }
3666
3667 if (mtc.mt_op == MTMKPART) {
3668 if (!STp->can_partitions) {
3669 retval = (-EINVAL);
3670 goto out;
3671 }
3672 i = do_load_unload(STp, file, 1);
3673 if (i < 0) {
3674 retval = i;
3675 goto out;
3676 }
3677 i = partition_tape(STp, mtc.mt_count);
3678 if (i < 0) {
3679 retval = i;
3680 goto out;
3681 }
3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3683 STp->ps[i].rw = ST_IDLE;
3684 STp->ps[i].at_sm = 0;
3685 STp->ps[i].last_block_valid = 0;
3686 }
3687 STp->partition = STp->new_partition = 0;
3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3689 STps->drv_block = STps->drv_file = 0;
3690 retval = 0;
3691 goto out;
3692 }
3693
3694 if (mtc.mt_op == MTSEEK) {
3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3696 if (!STp->can_partitions)
3697 STp->ps[0].rw = ST_IDLE;
3698 retval = i;
3699 goto out;
3700 }
3701
3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3703 retval = do_load_unload(STp, file, 0);
3704 goto out;
3705 }
3706
3707 if (mtc.mt_op == MTLOAD) {
3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3709 goto out;
3710 }
3711
3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3714 goto out;
3715 }
3716
3717 if (STp->can_partitions && STp->ready == ST_READY &&
3718 (i = switch_partition(STp)) < 0) {
3719 retval = i;
3720 goto out;
3721 }
3722
3723 if (mtc.mt_op == MTCOMPRESSION)
3724 retval = st_compression(STp, (mtc.mt_count & 1));
3725 else
3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3727 goto out;
3728 }
3729 if (!STm->defined) {
3730 retval = (-ENXIO);
3731 goto out;
3732 }
3733
3734 if ((i = flush_buffer(STp, 0)) < 0) {
3735 retval = i;
3736 goto out;
3737 }
3738 if (STp->can_partitions &&
3739 (i = switch_partition(STp)) < 0) {
3740 retval = i;
3741 goto out;
3742 }
3743
3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3745 struct mtget mt_status;
3746
3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3748 retval = (-EINVAL);
3749 goto out;
3750 }
3751
3752 mt_status.mt_type = STp->tape_type;
3753 mt_status.mt_dsreg =
3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3756 mt_status.mt_blkno = STps->drv_block;
3757 mt_status.mt_fileno = STps->drv_file;
3758 if (STp->block_size != 0) {
3759 if (STps->rw == ST_WRITING)
3760 mt_status.mt_blkno +=
3761 (STp->buffer)->buffer_bytes / STp->block_size;
3762 else if (STps->rw == ST_READING)
3763 mt_status.mt_blkno -=
3764 ((STp->buffer)->buffer_bytes +
3765 STp->block_size - 1) / STp->block_size;
3766 }
3767
3768 mt_status.mt_gstat = 0;
3769 if (STp->drv_write_prot)
3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3771 if (mt_status.mt_blkno == 0) {
3772 if (mt_status.mt_fileno == 0)
3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3774 else
3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3776 }
3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3778 mt_status.mt_resid = STp->partition;
3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3781 else if (STps->eof >= ST_EOM_OK)
3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3783 if (STp->density == 1)
3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3785 else if (STp->density == 2)
3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3787 else if (STp->density == 3)
3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3789 if (STp->ready == ST_READY)
3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3791 if (STp->ready == ST_NO_TAPE)
3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3793 if (STps->at_sm)
3794 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3795 if (STm->do_async_writes ||
3796 (STm->do_buffer_writes && STp->block_size != 0) ||
3797 STp->drv_buffer != 0)
3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3799 if (STp->cleaning_req)
3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3801
3802 retval = put_user_mtget(p, &mt_status);
3803 if (retval)
3804 goto out;
3805
3806 STp->recover_reg = 0; /* Clear after read */
3807 goto out;
3808 } /* End of MTIOCGET */
3809 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3810 struct mtpos mt_pos;
3811 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3812 retval = (-EINVAL);
3813 goto out;
3814 }
3815 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3816 retval = i;
3817 goto out;
3818 }
3819 mt_pos.mt_blkno = blk;
3820 retval = put_user_mtpos(p, &mt_pos);
3821 goto out;
3822 }
3823 mutex_unlock(&STp->lock);
3824 switch (cmd_in) {
3825 case SCSI_IOCTL_STOP_UNIT:
3826 /* unload */
3827 retval = scsi_ioctl(STp->device, cmd_in, p);
3828 if (!retval) {
3829 STp->rew_at_close = 0;
3830 STp->ready = ST_NO_TAPE;
3831 }
3832 return retval;
3833
3834 case SCSI_IOCTL_GET_IDLUN:
3835 case SCSI_IOCTL_GET_BUS_NUMBER:
3836 break;
3837
3838 default:
3839 if ((cmd_in == SG_IO ||
3840 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3841 cmd_in == CDROM_SEND_PACKET) &&
3842 !capable(CAP_SYS_RAWIO))
3843 i = -EPERM;
3844 else
3845 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3846 file->f_mode, cmd_in, p);
3847 if (i != -ENOTTY)
3848 return i;
3849 break;
3850 }
3851 return -ENOTTY;
3852
3853 out:
3854 mutex_unlock(&STp->lock);
3855 return retval;
3856}
3857
3858static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3859{
3860 void __user *p = (void __user *)arg;
3861 struct scsi_tape *STp = file->private_data;
3862 int ret;
3863
3864 ret = st_ioctl_common(file, cmd_in, p);
3865 if (ret != -ENOTTY)
3866 return ret;
3867
3868 return scsi_ioctl(STp->device, cmd_in, p);
3869}
3870
3871#ifdef CONFIG_COMPAT
3872static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3873{
3874 void __user *p = compat_ptr(arg);
3875 struct scsi_tape *STp = file->private_data;
3876 int ret;
3877
3878 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3879 switch (cmd_in) {
3880 case MTIOCPOS32:
3881 return st_ioctl_common(file, MTIOCPOS, p);
3882 case MTIOCGET32:
3883 return st_ioctl_common(file, MTIOCGET, p);
3884 }
3885
3886 ret = st_ioctl_common(file, cmd_in, p);
3887 if (ret != -ENOTTY)
3888 return ret;
3889
3890 return scsi_compat_ioctl(STp->device, cmd_in, p);
3891}
3892#endif
3893
3894
3895
3896/* Try to allocate a new tape buffer. Calling function must not hold
3897 dev_arr_lock. */
3898static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3899{
3900 struct st_buffer *tb;
3901
3902 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3903 if (!tb) {
3904 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3905 return NULL;
3906 }
3907 tb->frp_segs = 0;
3908 tb->use_sg = max_sg;
3909 tb->dma = need_dma;
3910 tb->buffer_size = 0;
3911
3912 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3913 GFP_KERNEL);
3914 if (!tb->reserved_pages) {
3915 kfree(tb);
3916 return NULL;
3917 }
3918
3919 return tb;
3920}
3921
3922
3923/* Try to allocate enough space in the tape buffer */
3924#define ST_MAX_ORDER 6
3925
3926static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3927{
3928 int segs, max_segs, b_size, order, got;
3929 gfp_t priority;
3930
3931 if (new_size <= STbuffer->buffer_size)
3932 return 1;
3933
3934 if (STbuffer->buffer_size <= PAGE_SIZE)
3935 normalize_buffer(STbuffer); /* Avoid extra segment */
3936
3937 max_segs = STbuffer->use_sg;
3938
3939 priority = GFP_KERNEL | __GFP_NOWARN;
3940 if (need_dma)
3941 priority |= GFP_DMA;
3942
3943 if (STbuffer->cleared)
3944 priority |= __GFP_ZERO;
3945
3946 if (STbuffer->frp_segs) {
3947 order = STbuffer->reserved_page_order;
3948 b_size = PAGE_SIZE << order;
3949 } else {
3950 for (b_size = PAGE_SIZE, order = 0;
3951 order < ST_MAX_ORDER &&
3952 max_segs * (PAGE_SIZE << order) < new_size;
3953 order++, b_size *= 2)
3954 ; /* empty */
3955 STbuffer->reserved_page_order = order;
3956 }
3957 if (max_segs * (PAGE_SIZE << order) < new_size) {
3958 if (order == ST_MAX_ORDER)
3959 return 0;
3960 normalize_buffer(STbuffer);
3961 return enlarge_buffer(STbuffer, new_size, need_dma);
3962 }
3963
3964 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3965 segs < max_segs && got < new_size;) {
3966 struct page *page;
3967
3968 page = alloc_pages(priority, order);
3969 if (!page) {
3970 DEB(STbuffer->buffer_size = got);
3971 normalize_buffer(STbuffer);
3972 return 0;
3973 }
3974
3975 STbuffer->frp_segs += 1;
3976 got += b_size;
3977 STbuffer->buffer_size = got;
3978 STbuffer->reserved_pages[segs] = page;
3979 segs++;
3980 }
3981 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3982
3983 return 1;
3984}
3985
3986
3987/* Make sure that no data from previous user is in the internal buffer */
3988static void clear_buffer(struct st_buffer * st_bp)
3989{
3990 int i;
3991
3992 for (i=0; i < st_bp->frp_segs; i++)
3993 memset(page_address(st_bp->reserved_pages[i]), 0,
3994 PAGE_SIZE << st_bp->reserved_page_order);
3995 st_bp->cleared = 1;
3996}
3997
3998
3999/* Release the extra buffer */
4000static void normalize_buffer(struct st_buffer * STbuffer)
4001{
4002 int i, order = STbuffer->reserved_page_order;
4003
4004 for (i = 0; i < STbuffer->frp_segs; i++) {
4005 __free_pages(STbuffer->reserved_pages[i], order);
4006 STbuffer->buffer_size -= (PAGE_SIZE << order);
4007 }
4008 STbuffer->frp_segs = 0;
4009 STbuffer->sg_segs = 0;
4010 STbuffer->reserved_page_order = 0;
4011 STbuffer->map_data.offset = 0;
4012}
4013
4014
4015/* Move data from the user buffer to the tape buffer. Returns zero (success) or
4016 negative error code. */
4017static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
4018{
4019 int i, cnt, res, offset;
4020 int length = PAGE_SIZE << st_bp->reserved_page_order;
4021
4022 for (i = 0, offset = st_bp->buffer_bytes;
4023 i < st_bp->frp_segs && offset >= length; i++)
4024 offset -= length;
4025 if (i == st_bp->frp_segs) { /* Should never happen */
4026 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4027 return (-EIO);
4028 }
4029 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4030 struct page *page = st_bp->reserved_pages[i];
4031 cnt = length - offset < do_count ? length - offset : do_count;
4032 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4033 if (res)
4034 return (-EFAULT);
4035 do_count -= cnt;
4036 st_bp->buffer_bytes += cnt;
4037 ubp += cnt;
4038 offset = 0;
4039 }
4040 if (do_count) /* Should never happen */
4041 return (-EIO);
4042
4043 return 0;
4044}
4045
4046
4047/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4048 negative error code. */
4049static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4050{
4051 int i, cnt, res, offset;
4052 int length = PAGE_SIZE << st_bp->reserved_page_order;
4053
4054 for (i = 0, offset = st_bp->read_pointer;
4055 i < st_bp->frp_segs && offset >= length; i++)
4056 offset -= length;
4057 if (i == st_bp->frp_segs) { /* Should never happen */
4058 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4059 return (-EIO);
4060 }
4061 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4062 struct page *page = st_bp->reserved_pages[i];
4063 cnt = length - offset < do_count ? length - offset : do_count;
4064 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4065 if (res)
4066 return (-EFAULT);
4067 do_count -= cnt;
4068 st_bp->buffer_bytes -= cnt;
4069 st_bp->read_pointer += cnt;
4070 ubp += cnt;
4071 offset = 0;
4072 }
4073 if (do_count) /* Should never happen */
4074 return (-EIO);
4075
4076 return 0;
4077}
4078
4079
4080/* Move data towards start of buffer */
4081static void move_buffer_data(struct st_buffer * st_bp, int offset)
4082{
4083 int src_seg, dst_seg, src_offset = 0, dst_offset;
4084 int count, total;
4085 int length = PAGE_SIZE << st_bp->reserved_page_order;
4086
4087 if (offset == 0)
4088 return;
4089
4090 total=st_bp->buffer_bytes - offset;
4091 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4092 src_offset = offset;
4093 if (src_offset < length)
4094 break;
4095 offset -= length;
4096 }
4097
4098 st_bp->buffer_bytes = st_bp->read_pointer = total;
4099 for (dst_seg=dst_offset=0; total > 0; ) {
4100 struct page *dpage = st_bp->reserved_pages[dst_seg];
4101 struct page *spage = st_bp->reserved_pages[src_seg];
4102
4103 count = min(length - dst_offset, length - src_offset);
4104 memmove(page_address(dpage) + dst_offset,
4105 page_address(spage) + src_offset, count);
4106 src_offset += count;
4107 if (src_offset >= length) {
4108 src_seg++;
4109 src_offset = 0;
4110 }
4111 dst_offset += count;
4112 if (dst_offset >= length) {
4113 dst_seg++;
4114 dst_offset = 0;
4115 }
4116 total -= count;
4117 }
4118}
4119
4120/* Validate the options from command line or module parameters */
4121static void validate_options(void)
4122{
4123 if (buffer_kbs > 0)
4124 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4125 if (max_sg_segs >= ST_FIRST_SG)
4126 st_max_sg_segs = max_sg_segs;
4127}
4128
4129#ifndef MODULE
4130/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4131 */
4132static int __init st_setup(char *str)
4133{
4134 int i, len, ints[5];
4135 char *stp;
4136
4137 stp = get_options(str, ARRAY_SIZE(ints), ints);
4138
4139 if (ints[0] > 0) {
4140 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4141 if (parms[i].val)
4142 *parms[i].val = ints[i + 1];
4143 } else {
4144 while (stp != NULL) {
4145 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4146 len = strlen(parms[i].name);
4147 if (!strncmp(stp, parms[i].name, len) &&
4148 (*(stp + len) == ':' || *(stp + len) == '=')) {
4149 if (parms[i].val)
4150 *parms[i].val =
4151 simple_strtoul(stp + len + 1, NULL, 0);
4152 else
4153 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4154 parms[i].name);
4155 break;
4156 }
4157 }
4158 if (i >= ARRAY_SIZE(parms))
4159 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4160 stp);
4161 stp = strchr(stp, ',');
4162 if (stp)
4163 stp++;
4164 }
4165 }
4166
4167 validate_options();
4168
4169 return 1;
4170}
4171
4172__setup("st=", st_setup);
4173
4174#endif
4175
4176static const struct file_operations st_fops =
4177{
4178 .owner = THIS_MODULE,
4179 .read = st_read,
4180 .write = st_write,
4181 .unlocked_ioctl = st_ioctl,
4182#ifdef CONFIG_COMPAT
4183 .compat_ioctl = st_compat_ioctl,
4184#endif
4185 .open = st_open,
4186 .flush = st_flush,
4187 .release = st_release,
4188 .llseek = noop_llseek,
4189};
4190
4191static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4192{
4193 int i, error;
4194 dev_t cdev_devno;
4195 struct cdev *cdev;
4196 struct device *dev;
4197 struct st_modedef *STm = &(tape->modes[mode]);
4198 char name[10];
4199 int dev_num = tape->index;
4200
4201 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4202
4203 cdev = cdev_alloc();
4204 if (!cdev) {
4205 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4206 error = -ENOMEM;
4207 goto out;
4208 }
4209 cdev->owner = THIS_MODULE;
4210 cdev->ops = &st_fops;
4211 STm->cdevs[rew] = cdev;
4212
4213 error = cdev_add(cdev, cdev_devno, 1);
4214 if (error) {
4215 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4216 rew ? "non" : "auto", mode);
4217 pr_err("st%d: Device not attached.\n", dev_num);
4218 goto out_free;
4219 }
4220
4221 i = mode << (4 - ST_NBR_MODE_BITS);
4222 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4223 tape->disk->disk_name, st_formats[i]);
4224
4225 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4226 cdev_devno, &tape->modes[mode], "%s", name);
4227 if (IS_ERR(dev)) {
4228 pr_err("st%d: device_create failed\n", dev_num);
4229 error = PTR_ERR(dev);
4230 goto out_free;
4231 }
4232
4233 STm->devs[rew] = dev;
4234
4235 return 0;
4236out_free:
4237 cdev_del(STm->cdevs[rew]);
4238out:
4239 STm->cdevs[rew] = NULL;
4240 STm->devs[rew] = NULL;
4241 return error;
4242}
4243
4244static int create_cdevs(struct scsi_tape *tape)
4245{
4246 int mode, error;
4247 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4248 error = create_one_cdev(tape, mode, 0);
4249 if (error)
4250 return error;
4251 error = create_one_cdev(tape, mode, 1);
4252 if (error)
4253 return error;
4254 }
4255
4256 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4257 &tape->modes[0].devs[0]->kobj, "tape");
4258}
4259
4260static void remove_cdevs(struct scsi_tape *tape)
4261{
4262 int mode, rew;
4263 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4264 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4265 struct st_modedef *STm = &(tape->modes[mode]);
4266 for (rew = 0; rew < 2; rew++) {
4267 if (STm->cdevs[rew])
4268 cdev_del(STm->cdevs[rew]);
4269 if (STm->devs[rew])
4270 device_unregister(STm->devs[rew]);
4271 }
4272 }
4273}
4274
4275static int st_probe(struct device *dev)
4276{
4277 struct scsi_device *SDp = to_scsi_device(dev);
4278 struct gendisk *disk = NULL;
4279 struct scsi_tape *tpnt = NULL;
4280 struct st_modedef *STm;
4281 struct st_partstat *STps;
4282 struct st_buffer *buffer;
4283 int i, error;
4284 char *stp;
4285
4286 if (SDp->type != TYPE_TAPE)
4287 return -ENODEV;
4288 if ((stp = st_incompatible(SDp))) {
4289 sdev_printk(KERN_INFO, SDp,
4290 "OnStream tapes are no longer supported;\n");
4291 sdev_printk(KERN_INFO, SDp,
4292 "please mail to linux-scsi@vger.kernel.org.\n");
4293 return -ENODEV;
4294 }
4295
4296 scsi_autopm_get_device(SDp);
4297 i = queue_max_segments(SDp->request_queue);
4298 if (st_max_sg_segs < i)
4299 i = st_max_sg_segs;
4300 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4301 if (buffer == NULL) {
4302 sdev_printk(KERN_ERR, SDp,
4303 "st: Can't allocate new tape buffer. "
4304 "Device not attached.\n");
4305 goto out;
4306 }
4307
4308 disk = alloc_disk(1);
4309 if (!disk) {
4310 sdev_printk(KERN_ERR, SDp,
4311 "st: out of memory. Device not attached.\n");
4312 goto out_buffer_free;
4313 }
4314
4315 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4316 if (tpnt == NULL) {
4317 sdev_printk(KERN_ERR, SDp,
4318 "st: Can't allocate device descriptor.\n");
4319 goto out_put_disk;
4320 }
4321 kref_init(&tpnt->kref);
4322 tpnt->disk = disk;
4323 disk->private_data = &tpnt->driver;
4324 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4325 * take queue reference that release_disk() expects. */
4326 if (!blk_get_queue(SDp->request_queue))
4327 goto out_put_disk;
4328 disk->queue = SDp->request_queue;
4329 tpnt->driver = &st_template;
4330
4331 tpnt->device = SDp;
4332 if (SDp->scsi_level <= 2)
4333 tpnt->tape_type = MT_ISSCSI1;
4334 else
4335 tpnt->tape_type = MT_ISSCSI2;
4336
4337 tpnt->buffer = buffer;
4338 tpnt->buffer->last_SRpnt = NULL;
4339
4340 tpnt->inited = 0;
4341 tpnt->dirty = 0;
4342 tpnt->in_use = 0;
4343 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4344 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4345 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4346 tpnt->density = 0;
4347 tpnt->do_auto_lock = ST_AUTO_LOCK;
4348 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4349 tpnt->can_partitions = 0;
4350 tpnt->two_fm = ST_TWO_FM;
4351 tpnt->fast_mteom = ST_FAST_MTEOM;
4352 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4353 tpnt->sili = ST_SILI;
4354 tpnt->immediate = ST_NOWAIT;
4355 tpnt->immediate_filemark = 0;
4356 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4357 tpnt->partition = 0;
4358 tpnt->new_partition = 0;
4359 tpnt->nbr_partitions = 0;
4360 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4361 tpnt->long_timeout = ST_LONG_TIMEOUT;
4362 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4363
4364 for (i = 0; i < ST_NBR_MODES; i++) {
4365 STm = &(tpnt->modes[i]);
4366 STm->defined = 0;
4367 STm->sysv = ST_SYSV;
4368 STm->defaults_for_writes = 0;
4369 STm->do_async_writes = ST_ASYNC_WRITES;
4370 STm->do_buffer_writes = ST_BUFFER_WRITES;
4371 STm->do_read_ahead = ST_READ_AHEAD;
4372 STm->default_compression = ST_DONT_TOUCH;
4373 STm->default_blksize = (-1); /* No forced size */
4374 STm->default_density = (-1); /* No forced density */
4375 STm->tape = tpnt;
4376 }
4377
4378 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4379 STps = &(tpnt->ps[i]);
4380 STps->rw = ST_IDLE;
4381 STps->eof = ST_NOEOF;
4382 STps->at_sm = 0;
4383 STps->last_block_valid = 0;
4384 STps->drv_block = (-1);
4385 STps->drv_file = (-1);
4386 }
4387
4388 tpnt->current_mode = 0;
4389 tpnt->modes[0].defined = 1;
4390
4391 tpnt->density_changed = tpnt->compression_changed =
4392 tpnt->blksize_changed = 0;
4393 mutex_init(&tpnt->lock);
4394
4395 idr_preload(GFP_KERNEL);
4396 spin_lock(&st_index_lock);
4397 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4398 spin_unlock(&st_index_lock);
4399 idr_preload_end();
4400 if (error < 0) {
4401 pr_warn("st: idr allocation failed: %d\n", error);
4402 goto out_put_queue;
4403 }
4404 tpnt->index = error;
4405 sprintf(disk->disk_name, "st%d", tpnt->index);
4406 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4407 if (tpnt->stats == NULL) {
4408 sdev_printk(KERN_ERR, SDp,
4409 "st: Can't allocate statistics.\n");
4410 goto out_idr_remove;
4411 }
4412
4413 dev_set_drvdata(dev, tpnt);
4414
4415
4416 error = create_cdevs(tpnt);
4417 if (error)
4418 goto out_remove_devs;
4419 scsi_autopm_put_device(SDp);
4420
4421 sdev_printk(KERN_NOTICE, SDp,
4422 "Attached scsi tape %s\n", tape_name(tpnt));
4423 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4424 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4425 queue_dma_alignment(SDp->request_queue) + 1);
4426
4427 return 0;
4428
4429out_remove_devs:
4430 remove_cdevs(tpnt);
4431 kfree(tpnt->stats);
4432out_idr_remove:
4433 spin_lock(&st_index_lock);
4434 idr_remove(&st_index_idr, tpnt->index);
4435 spin_unlock(&st_index_lock);
4436out_put_queue:
4437 blk_put_queue(disk->queue);
4438out_put_disk:
4439 put_disk(disk);
4440 kfree(tpnt);
4441out_buffer_free:
4442 kfree(buffer);
4443out:
4444 scsi_autopm_put_device(SDp);
4445 return -ENODEV;
4446};
4447
4448
4449static int st_remove(struct device *dev)
4450{
4451 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4452 int index = tpnt->index;
4453
4454 scsi_autopm_get_device(to_scsi_device(dev));
4455 remove_cdevs(tpnt);
4456
4457 mutex_lock(&st_ref_mutex);
4458 kref_put(&tpnt->kref, scsi_tape_release);
4459 mutex_unlock(&st_ref_mutex);
4460 spin_lock(&st_index_lock);
4461 idr_remove(&st_index_idr, index);
4462 spin_unlock(&st_index_lock);
4463 return 0;
4464}
4465
4466/**
4467 * scsi_tape_release - Called to free the Scsi_Tape structure
4468 * @kref: pointer to embedded kref
4469 *
4470 * st_ref_mutex must be held entering this routine. Because it is
4471 * called on last put, you should always use the scsi_tape_get()
4472 * scsi_tape_put() helpers which manipulate the semaphore directly
4473 * and never do a direct kref_put().
4474 **/
4475static void scsi_tape_release(struct kref *kref)
4476{
4477 struct scsi_tape *tpnt = to_scsi_tape(kref);
4478 struct gendisk *disk = tpnt->disk;
4479
4480 tpnt->device = NULL;
4481
4482 if (tpnt->buffer) {
4483 normalize_buffer(tpnt->buffer);
4484 kfree(tpnt->buffer->reserved_pages);
4485 kfree(tpnt->buffer);
4486 }
4487
4488 disk->private_data = NULL;
4489 put_disk(disk);
4490 kfree(tpnt->stats);
4491 kfree(tpnt);
4492 return;
4493}
4494
4495static struct class st_sysfs_class = {
4496 .name = "scsi_tape",
4497 .dev_groups = st_dev_groups,
4498};
4499
4500static int __init init_st(void)
4501{
4502 int err;
4503
4504 validate_options();
4505
4506 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4507 verstr, st_fixed_buffer_size, st_max_sg_segs);
4508
4509 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4510 if (debugging) {
4511 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4512 debugging);
4513 }
4514
4515 err = class_register(&st_sysfs_class);
4516 if (err) {
4517 pr_err("Unable register sysfs class for SCSI tapes\n");
4518 return err;
4519 }
4520
4521 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4522 ST_MAX_TAPE_ENTRIES, "st");
4523 if (err) {
4524 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4525 SCSI_TAPE_MAJOR);
4526 goto err_class;
4527 }
4528
4529 err = scsi_register_driver(&st_template.gendrv);
4530 if (err)
4531 goto err_chrdev;
4532
4533 return 0;
4534
4535err_chrdev:
4536 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4537 ST_MAX_TAPE_ENTRIES);
4538err_class:
4539 class_unregister(&st_sysfs_class);
4540 return err;
4541}
4542
4543static void __exit exit_st(void)
4544{
4545 scsi_unregister_driver(&st_template.gendrv);
4546 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4547 ST_MAX_TAPE_ENTRIES);
4548 class_unregister(&st_sysfs_class);
4549 idr_destroy(&st_index_idr);
4550 printk(KERN_INFO "st: Unloaded.\n");
4551}
4552
4553module_init(init_st);
4554module_exit(exit_st);
4555
4556
4557/* The sysfs driver interface. Read-only at the moment */
4558static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4559{
4560 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4561}
4562static DRIVER_ATTR_RO(try_direct_io);
4563
4564static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4565{
4566 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4567}
4568static DRIVER_ATTR_RO(fixed_buffer_size);
4569
4570static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4571{
4572 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4573}
4574static DRIVER_ATTR_RO(max_sg_segs);
4575
4576static ssize_t version_show(struct device_driver *ddd, char *buf)
4577{
4578 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4579}
4580static DRIVER_ATTR_RO(version);
4581
4582#if DEBUG
4583static ssize_t debug_flag_store(struct device_driver *ddp,
4584 const char *buf, size_t count)
4585{
4586/* We only care what the first byte of the data is the rest is unused.
4587 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4588 * other values have -EINVAL returned if they are passed in.
4589 */
4590 if (count > 0) {
4591 if (buf[0] == '0') {
4592 debugging = NO_DEBUG;
4593 return count;
4594 } else if (buf[0] == '1') {
4595 debugging = 1;
4596 return count;
4597 }
4598 }
4599 return -EINVAL;
4600}
4601
4602static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4603{
4604 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4605}
4606static DRIVER_ATTR_RW(debug_flag);
4607#endif
4608
4609static struct attribute *st_drv_attrs[] = {
4610 &driver_attr_try_direct_io.attr,
4611 &driver_attr_fixed_buffer_size.attr,
4612 &driver_attr_max_sg_segs.attr,
4613 &driver_attr_version.attr,
4614#if DEBUG
4615 &driver_attr_debug_flag.attr,
4616#endif
4617 NULL,
4618};
4619ATTRIBUTE_GROUPS(st_drv);
4620
4621/* The sysfs simple class interface */
4622static ssize_t
4623defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4624{
4625 struct st_modedef *STm = dev_get_drvdata(dev);
4626 ssize_t l = 0;
4627
4628 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4629 return l;
4630}
4631static DEVICE_ATTR_RO(defined);
4632
4633static ssize_t
4634default_blksize_show(struct device *dev, struct device_attribute *attr,
4635 char *buf)
4636{
4637 struct st_modedef *STm = dev_get_drvdata(dev);
4638 ssize_t l = 0;
4639
4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4641 return l;
4642}
4643static DEVICE_ATTR_RO(default_blksize);
4644
4645static ssize_t
4646default_density_show(struct device *dev, struct device_attribute *attr,
4647 char *buf)
4648{
4649 struct st_modedef *STm = dev_get_drvdata(dev);
4650 ssize_t l = 0;
4651 char *fmt;
4652
4653 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4654 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4655 return l;
4656}
4657static DEVICE_ATTR_RO(default_density);
4658
4659static ssize_t
4660default_compression_show(struct device *dev, struct device_attribute *attr,
4661 char *buf)
4662{
4663 struct st_modedef *STm = dev_get_drvdata(dev);
4664 ssize_t l = 0;
4665
4666 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4667 return l;
4668}
4669static DEVICE_ATTR_RO(default_compression);
4670
4671static ssize_t
4672options_show(struct device *dev, struct device_attribute *attr, char *buf)
4673{
4674 struct st_modedef *STm = dev_get_drvdata(dev);
4675 struct scsi_tape *STp = STm->tape;
4676 int options;
4677 ssize_t l = 0;
4678
4679 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4680 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4681 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4682 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4683 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4684 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4685 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4686 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4687 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4688 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4689 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4690 options |= STm->sysv ? MT_ST_SYSV : 0;
4691 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4692 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4693 options |= STp->sili ? MT_ST_SILI : 0;
4694
4695 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4696 return l;
4697}
4698static DEVICE_ATTR_RO(options);
4699
4700/* Support for tape stats */
4701
4702/**
4703 * read_cnt_show - return read count - count of reads made from tape drive
4704 * @dev: struct device
4705 * @attr: attribute structure
4706 * @buf: buffer to return formatted data in
4707 */
4708static ssize_t read_cnt_show(struct device *dev,
4709 struct device_attribute *attr, char *buf)
4710{
4711 struct st_modedef *STm = dev_get_drvdata(dev);
4712
4713 return sprintf(buf, "%lld",
4714 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4715}
4716static DEVICE_ATTR_RO(read_cnt);
4717
4718/**
4719 * read_byte_cnt_show - return read byte count - tape drives
4720 * may use blocks less than 512 bytes this gives the raw byte count of
4721 * of data read from the tape drive.
4722 * @dev: struct device
4723 * @attr: attribute structure
4724 * @buf: buffer to return formatted data in
4725 */
4726static ssize_t read_byte_cnt_show(struct device *dev,
4727 struct device_attribute *attr, char *buf)
4728{
4729 struct st_modedef *STm = dev_get_drvdata(dev);
4730
4731 return sprintf(buf, "%lld",
4732 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4733}
4734static DEVICE_ATTR_RO(read_byte_cnt);
4735
4736/**
4737 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4738 * @dev: struct device
4739 * @attr: attribute structure
4740 * @buf: buffer to return formatted data in
4741 */
4742static ssize_t read_ns_show(struct device *dev,
4743 struct device_attribute *attr, char *buf)
4744{
4745 struct st_modedef *STm = dev_get_drvdata(dev);
4746
4747 return sprintf(buf, "%lld",
4748 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4749}
4750static DEVICE_ATTR_RO(read_ns);
4751
4752/**
4753 * write_cnt_show - write count - number of user calls
4754 * to write(2) that have written data to tape.
4755 * @dev: struct device
4756 * @attr: attribute structure
4757 * @buf: buffer to return formatted data in
4758 */
4759static ssize_t write_cnt_show(struct device *dev,
4760 struct device_attribute *attr, char *buf)
4761{
4762 struct st_modedef *STm = dev_get_drvdata(dev);
4763
4764 return sprintf(buf, "%lld",
4765 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4766}
4767static DEVICE_ATTR_RO(write_cnt);
4768
4769/**
4770 * write_byte_cnt_show - write byte count - raw count of
4771 * bytes written to tape.
4772 * @dev: struct device
4773 * @attr: attribute structure
4774 * @buf: buffer to return formatted data in
4775 */
4776static ssize_t write_byte_cnt_show(struct device *dev,
4777 struct device_attribute *attr, char *buf)
4778{
4779 struct st_modedef *STm = dev_get_drvdata(dev);
4780
4781 return sprintf(buf, "%lld",
4782 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4783}
4784static DEVICE_ATTR_RO(write_byte_cnt);
4785
4786/**
4787 * write_ns_show - write ns - number of nanoseconds waiting on write
4788 * requests to complete.
4789 * @dev: struct device
4790 * @attr: attribute structure
4791 * @buf: buffer to return formatted data in
4792 */
4793static ssize_t write_ns_show(struct device *dev,
4794 struct device_attribute *attr, char *buf)
4795{
4796 struct st_modedef *STm = dev_get_drvdata(dev);
4797
4798 return sprintf(buf, "%lld",
4799 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4800}
4801static DEVICE_ATTR_RO(write_ns);
4802
4803/**
4804 * in_flight_show - number of I/Os currently in flight -
4805 * in most cases this will be either 0 or 1. It may be higher if someone
4806 * has also issued other SCSI commands such as via an ioctl.
4807 * @dev: struct device
4808 * @attr: attribute structure
4809 * @buf: buffer to return formatted data in
4810 */
4811static ssize_t in_flight_show(struct device *dev,
4812 struct device_attribute *attr, char *buf)
4813{
4814 struct st_modedef *STm = dev_get_drvdata(dev);
4815
4816 return sprintf(buf, "%lld",
4817 (long long)atomic64_read(&STm->tape->stats->in_flight));
4818}
4819static DEVICE_ATTR_RO(in_flight);
4820
4821/**
4822 * io_ns_show - io wait ns - this is the number of ns spent
4823 * waiting on all I/O to complete. This includes tape movement commands
4824 * such as rewinding, seeking to end of file or tape, it also includes
4825 * read and write. To determine the time spent on tape movement
4826 * subtract the read and write ns from this value.
4827 * @dev: struct device
4828 * @attr: attribute structure
4829 * @buf: buffer to return formatted data in
4830 */
4831static ssize_t io_ns_show(struct device *dev,
4832 struct device_attribute *attr, char *buf)
4833{
4834 struct st_modedef *STm = dev_get_drvdata(dev);
4835
4836 return sprintf(buf, "%lld",
4837 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4838}
4839static DEVICE_ATTR_RO(io_ns);
4840
4841/**
4842 * other_cnt_show - other io count - this is the number of
4843 * I/O requests other than read and write requests.
4844 * Typically these are tape movement requests but will include driver
4845 * tape movement. This includes only requests issued by the st driver.
4846 * @dev: struct device
4847 * @attr: attribute structure
4848 * @buf: buffer to return formatted data in
4849 */
4850static ssize_t other_cnt_show(struct device *dev,
4851 struct device_attribute *attr, char *buf)
4852{
4853 struct st_modedef *STm = dev_get_drvdata(dev);
4854
4855 return sprintf(buf, "%lld",
4856 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4857}
4858static DEVICE_ATTR_RO(other_cnt);
4859
4860/**
4861 * resid_cnt_show - A count of the number of times we get a residual
4862 * count - this should indicate someone issuing reads larger than the
4863 * block size on tape.
4864 * @dev: struct device
4865 * @attr: attribute structure
4866 * @buf: buffer to return formatted data in
4867 */
4868static ssize_t resid_cnt_show(struct device *dev,
4869 struct device_attribute *attr, char *buf)
4870{
4871 struct st_modedef *STm = dev_get_drvdata(dev);
4872
4873 return sprintf(buf, "%lld",
4874 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4875}
4876static DEVICE_ATTR_RO(resid_cnt);
4877
4878static struct attribute *st_dev_attrs[] = {
4879 &dev_attr_defined.attr,
4880 &dev_attr_default_blksize.attr,
4881 &dev_attr_default_density.attr,
4882 &dev_attr_default_compression.attr,
4883 &dev_attr_options.attr,
4884 NULL,
4885};
4886
4887static struct attribute *st_stats_attrs[] = {
4888 &dev_attr_read_cnt.attr,
4889 &dev_attr_read_byte_cnt.attr,
4890 &dev_attr_read_ns.attr,
4891 &dev_attr_write_cnt.attr,
4892 &dev_attr_write_byte_cnt.attr,
4893 &dev_attr_write_ns.attr,
4894 &dev_attr_in_flight.attr,
4895 &dev_attr_io_ns.attr,
4896 &dev_attr_other_cnt.attr,
4897 &dev_attr_resid_cnt.attr,
4898 NULL,
4899};
4900
4901static struct attribute_group stats_group = {
4902 .name = "stats",
4903 .attrs = st_stats_attrs,
4904};
4905
4906static struct attribute_group st_group = {
4907 .attrs = st_dev_attrs,
4908};
4909
4910static const struct attribute_group *st_dev_groups[] = {
4911 &st_group,
4912 &stats_group,
4913 NULL,
4914};
4915
4916/* The following functions may be useful for a larger audience. */
4917static int sgl_map_user_pages(struct st_buffer *STbp,
4918 const unsigned int max_pages, unsigned long uaddr,
4919 size_t count, int rw)
4920{
4921 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4922 unsigned long start = uaddr >> PAGE_SHIFT;
4923 const int nr_pages = end - start;
4924 int res, i;
4925 struct page **pages;
4926 struct rq_map_data *mdata = &STbp->map_data;
4927
4928 /* User attempted Overflow! */
4929 if ((uaddr + count) < uaddr)
4930 return -EINVAL;
4931
4932 /* Too big */
4933 if (nr_pages > max_pages)
4934 return -ENOMEM;
4935
4936 /* Hmm? */
4937 if (count == 0)
4938 return 0;
4939
4940 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4941 if (pages == NULL)
4942 return -ENOMEM;
4943
4944 /* Try to fault in all of the necessary pages */
4945 /* rw==READ means read from drive, write into memory area */
4946 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4947 pages);
4948
4949 /* Errors and no page mapped should return here */
4950 if (res < nr_pages)
4951 goto out_unmap;
4952
4953 for (i=0; i < nr_pages; i++) {
4954 /* FIXME: flush superflous for rw==READ,
4955 * probably wrong function for rw==WRITE
4956 */
4957 flush_dcache_page(pages[i]);
4958 }
4959
4960 mdata->offset = uaddr & ~PAGE_MASK;
4961 STbp->mapped_pages = pages;
4962
4963 return nr_pages;
4964 out_unmap:
4965 if (res > 0) {
4966 unpin_user_pages(pages, res);
4967 res = 0;
4968 }
4969 kfree(pages);
4970 return res;
4971}
4972
4973
4974/* And unmap them... */
4975static int sgl_unmap_user_pages(struct st_buffer *STbp,
4976 const unsigned int nr_pages, int dirtied)
4977{
4978 /* FIXME: cache flush missing for rw==READ */
4979 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);
4980
4981 kfree(STbp->mapped_pages);
4982 STbp->mapped_pages = NULL;
4983
4984 return 0;
4985}
1/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
12 Copyright 1992 - 2016 Kai Makisara
13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
20static const char *verstr = "20160209";
21
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/mm.h>
28#include <linux/init.h>
29#include <linux/string.h>
30#include <linux/slab.h>
31#include <linux/errno.h>
32#include <linux/mtio.h>
33#include <linux/cdrom.h>
34#include <linux/ioctl.h>
35#include <linux/fcntl.h>
36#include <linux/spinlock.h>
37#include <linux/blkdev.h>
38#include <linux/moduleparam.h>
39#include <linux/cdev.h>
40#include <linux/idr.h>
41#include <linux/delay.h>
42#include <linux/mutex.h>
43
44#include <asm/uaccess.h>
45#include <asm/dma.h>
46
47#include <scsi/scsi.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/scsi_device.h>
50#include <scsi/scsi_driver.h>
51#include <scsi/scsi_eh.h>
52#include <scsi/scsi_host.h>
53#include <scsi/scsi_ioctl.h>
54#include <scsi/sg.h>
55
56
57/* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59#define DEBUG 1
60#define NO_DEBUG 0
61
62#define ST_DEB_MSG KERN_NOTICE
63#if DEBUG
64/* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
67#define DEB(a) a
68#define DEBC(a) if (debugging) { a ; }
69#else
70#define DEB(a)
71#define DEBC(a)
72#endif
73
74#define ST_KILOBYTE 1024
75
76#include "st_options.h"
77#include "st.h"
78
79static int buffer_kbs;
80static int max_sg_segs;
81static int try_direct_io = TRY_DIRECT_IO;
82static int try_rdio = 1;
83static int try_wdio = 1;
84static int debug_flag;
85
86static struct class st_sysfs_class;
87static const struct attribute_group *st_dev_groups[];
88static const struct attribute_group *st_drv_groups[];
89
90MODULE_AUTHOR("Kai Makisara");
91MODULE_DESCRIPTION("SCSI tape (st) driver");
92MODULE_LICENSE("GPL");
93MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
95
96/* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100module_param_named(buffer_kbs, buffer_kbs, int, 0);
101MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102module_param_named(max_sg_segs, max_sg_segs, int, 0);
103MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104module_param_named(try_direct_io, try_direct_io, int, 0);
105MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106module_param_named(debug_flag, debug_flag, int, 0);
107MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
109
110/* Extra parameters for testing */
111module_param_named(try_rdio, try_rdio, int, 0);
112MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113module_param_named(try_wdio, try_wdio, int, 0);
114MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116#ifndef MODULE
117static int write_threshold_kbs; /* retained for compatibility */
118static struct st_dev_parm {
119 char *name;
120 int *val;
121} parms[] __initdata = {
122 {
123 "buffer_kbs", &buffer_kbs
124 },
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
127 },
128 {
129 "max_sg_segs", NULL
130 },
131 {
132 "try_direct_io", &try_direct_io
133 },
134 {
135 "debug_flag", &debug_flag
136 }
137};
138#endif
139
140/* Restrict the number of modes so that names for all are assigned */
141#if ST_NBR_MODES > 16
142#error "Maximum number of modes is 16"
143#endif
144/* Bit reversed order to get same names for same minors with all
145 mode counts */
146static const char *st_formats[] = {
147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
149
150/* The default definitions have been moved to st_options.h */
151
152#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
153
154/* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
158#endif
159
160static int debugging = DEBUG;
161
162#define MAX_RETRIES 0
163#define MAX_WRITE_RETRIES 0
164#define MAX_READY_RETRIES 0
165#define NO_TAPE NOT_READY
166
167#define ST_TIMEOUT (900 * HZ)
168#define ST_LONG_TIMEOUT (14000 * HZ)
169
170/* Remove mode bits and auto-rewind bit (7) */
171#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
174
175/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
178
179/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
180 24 bits) */
181#define SET_DENS_AND_BLK 0x10001
182
183static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184static int st_max_sg_segs = ST_MAX_SG;
185
186static int modes_defined;
187
188static int enlarge_buffer(struct st_buffer *, int, int);
189static void clear_buffer(struct st_buffer *);
190static void normalize_buffer(struct st_buffer *);
191static int append_to_buffer(const char __user *, struct st_buffer *, int);
192static int from_buffer(struct st_buffer *, char __user *, int);
193static void move_buffer_data(struct st_buffer *, int);
194
195static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
196 unsigned long, size_t, int);
197static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
198
199static int st_probe(struct device *);
200static int st_remove(struct device *);
201
202static struct scsi_driver st_template = {
203 .gendrv = {
204 .name = "st",
205 .owner = THIS_MODULE,
206 .probe = st_probe,
207 .remove = st_remove,
208 .groups = st_drv_groups,
209 },
210};
211
212static int st_compression(struct scsi_tape *, int);
213
214static int find_partition(struct scsi_tape *);
215static int switch_partition(struct scsi_tape *);
216
217static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
219static void scsi_tape_release(struct kref *);
220
221#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
223static DEFINE_MUTEX(st_ref_mutex);
224static DEFINE_SPINLOCK(st_index_lock);
225static DEFINE_SPINLOCK(st_use_lock);
226static DEFINE_IDR(st_index_idr);
227
228
229
230#include "osst_detect.h"
231#ifndef SIGS_FROM_OSST
232#define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
238#endif
239
240static struct scsi_tape *scsi_tape_get(int dev)
241{
242 struct scsi_tape *STp = NULL;
243
244 mutex_lock(&st_ref_mutex);
245 spin_lock(&st_index_lock);
246
247 STp = idr_find(&st_index_idr, dev);
248 if (!STp) goto out;
249
250 kref_get(&STp->kref);
251
252 if (!STp->device)
253 goto out_put;
254
255 if (scsi_device_get(STp->device))
256 goto out_put;
257
258 goto out;
259
260out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263out:
264 spin_unlock(&st_index_lock);
265 mutex_unlock(&st_ref_mutex);
266 return STp;
267}
268
269static void scsi_tape_put(struct scsi_tape *STp)
270{
271 struct scsi_device *sdev = STp->device;
272
273 mutex_lock(&st_ref_mutex);
274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
276 mutex_unlock(&st_ref_mutex);
277}
278
279struct st_reject_data {
280 char *vendor;
281 char *model;
282 char *rev;
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
284};
285
286static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
288 SIGS_FROM_OSST,
289 {NULL, }};
290
291/* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293static char * st_incompatible(struct scsi_device* SDp)
294{
295 struct st_reject_data *rp;
296
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
301 if (rp->driver_hint)
302 return rp->driver_hint;
303 else
304 return "unknown";
305 }
306 return NULL;
307}
308
309
310static inline char *tape_name(struct scsi_tape *tape)
311{
312 return tape->disk->disk_name;
313}
314
315#define st_printk(prefix, t, fmt, a...) \
316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
317#ifdef DEBUG
318#define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
320#else
321#define DEBC_printk(t, fmt, a...)
322#endif
323
324static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
325{
326 const u8 *ucp;
327 const u8 *sense = SRpnt->sense;
328
329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
331 s->flags = 0;
332
333 if (s->have_sense) {
334 s->deferred = 0;
335 s->remainder_valid =
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
338 case 0x71:
339 s->deferred = 1;
340 case 0x70:
341 s->fixed_format = 1;
342 s->flags = sense[2] & 0xe0;
343 break;
344 case 0x73:
345 s->deferred = 1;
346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353}
354
355
356/* Convert the result to success code */
357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
358{
359 int result = SRpnt->result;
360 u8 scode;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
369 st_analyze_sense(SRpnt, cmdstatp);
370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
382 if (cmdstatp->have_sense)
383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
399
400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422#if ST_RECOVERED_WRITE_FATAL
423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
425#endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
430 DEB(
431 if (debugging) {
432 if (SRpnt->cmd[0] == READ_6)
433 stp = "read";
434 else if (SRpnt->cmd[0] == WRITE_6)
435 stp = "write";
436 else
437 stp = "ioctl";
438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447}
448
449static struct st_request *st_allocate_request(struct scsi_tape *stp)
450{
451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
466}
467
468static void st_release_request(struct st_request *streq)
469{
470 kfree(streq);
471}
472
473static void st_do_stats(struct scsi_tape *STp, struct request *req)
474{
475 ktime_t now;
476
477 now = ktime_get();
478 if (req->cmd[0] == WRITE_6) {
479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
483 if (req->errors) {
484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
492 } else if (req->cmd[0] == READ_6) {
493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
497 if (req->errors) {
498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512}
513
514static void st_scsi_execute_end(struct request *req, int uptodate)
515{
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_tape *STp = SRpnt->stp;
518 struct bio *tmp;
519
520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
521 STp->buffer->cmdstat.residual = req->resid_len;
522
523 st_do_stats(STp, req);
524
525 tmp = SRpnt->bio;
526 if (SRpnt->waiting)
527 complete(SRpnt->waiting);
528
529 blk_rq_unmap_user(tmp);
530 __blk_put_request(req->q, req);
531}
532
533static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
534 int data_direction, void *buffer, unsigned bufflen,
535 int timeout, int retries)
536{
537 struct request *req;
538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
539 int err = 0;
540 int write = (data_direction == DMA_TO_DEVICE);
541 struct scsi_tape *STp = SRpnt->stp;
542
543 req = blk_get_request(SRpnt->stp->device->request_queue, write,
544 GFP_KERNEL);
545 if (IS_ERR(req))
546 return DRIVER_ERROR << 24;
547
548 blk_rq_set_block_pc(req);
549 req->cmd_flags |= REQ_QUIET;
550
551 mdata->null_mapped = 1;
552
553 if (bufflen) {
554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
555 GFP_KERNEL);
556 if (err) {
557 blk_put_request(req);
558 return DRIVER_ERROR << 24;
559 }
560 }
561
562 atomic64_inc(&STp->stats->in_flight);
563 if (cmd[0] == WRITE_6) {
564 atomic_set(&STp->stats->last_write_size, bufflen);
565 STp->stats->write_time = ktime_get();
566 } else if (cmd[0] == READ_6) {
567 atomic_set(&STp->stats->last_read_size, bufflen);
568 STp->stats->read_time = ktime_get();
569 } else {
570 STp->stats->other_time = ktime_get();
571 }
572
573 SRpnt->bio = req->bio;
574 req->cmd_len = COMMAND_SIZE(cmd[0]);
575 memset(req->cmd, 0, BLK_MAX_CDB);
576 memcpy(req->cmd, cmd, req->cmd_len);
577 req->sense = SRpnt->sense;
578 req->sense_len = 0;
579 req->timeout = timeout;
580 req->retries = retries;
581 req->end_io_data = SRpnt;
582
583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
584 return 0;
585}
586
587/* Do the scsi command. Waits until command performed if do_wait is true.
588 Otherwise write_behind_check() is used to check that the command
589 has finished. */
590static struct st_request *
591st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
592 int bytes, int direction, int timeout, int retries, int do_wait)
593{
594 struct completion *waiting;
595 struct rq_map_data *mdata = &STp->buffer->map_data;
596 int ret;
597
598 /* if async, make sure there's no command outstanding */
599 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
600 st_printk(KERN_ERR, STp,
601 "Async command already active.\n");
602 if (signal_pending(current))
603 (STp->buffer)->syscall_result = (-EINTR);
604 else
605 (STp->buffer)->syscall_result = (-EBUSY);
606 return NULL;
607 }
608
609 if (!SRpnt) {
610 SRpnt = st_allocate_request(STp);
611 if (!SRpnt)
612 return NULL;
613 }
614
615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
616 which IO is outstanding. It's nulled out when the IO completes. */
617 if (!do_wait)
618 (STp->buffer)->last_SRpnt = SRpnt;
619
620 waiting = &STp->wait;
621 init_completion(waiting);
622 SRpnt->waiting = waiting;
623
624 if (STp->buffer->do_dio) {
625 mdata->page_order = 0;
626 mdata->nr_entries = STp->buffer->sg_segs;
627 mdata->pages = STp->buffer->mapped_pages;
628 } else {
629 mdata->page_order = STp->buffer->reserved_page_order;
630 mdata->nr_entries =
631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
632 mdata->pages = STp->buffer->reserved_pages;
633 mdata->offset = 0;
634 }
635
636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
637 STp->buffer->cmdstat.have_sense = 0;
638 STp->buffer->syscall_result = 0;
639
640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
641 retries);
642 if (ret) {
643 /* could not allocate the buffer or request was too large */
644 (STp->buffer)->syscall_result = (-EBUSY);
645 (STp->buffer)->last_SRpnt = NULL;
646 } else if (do_wait) {
647 wait_for_completion(waiting);
648 SRpnt->waiting = NULL;
649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
650 }
651
652 return SRpnt;
653}
654
655
656/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
657 write has been correct but EOM early warning reached, -EIO if write ended in
658 error or zero if write successful. Asynchronous writes are used only in
659 variable block mode. */
660static int write_behind_check(struct scsi_tape * STp)
661{
662 int retval = 0;
663 struct st_buffer *STbuffer;
664 struct st_partstat *STps;
665 struct st_cmdstatus *cmdstatp;
666 struct st_request *SRpnt;
667
668 STbuffer = STp->buffer;
669 if (!STbuffer->writing)
670 return 0;
671
672 DEB(
673 if (STp->write_pending)
674 STp->nbr_waits++;
675 else
676 STp->nbr_finished++;
677 ) /* end DEB */
678
679 wait_for_completion(&(STp->wait));
680 SRpnt = STbuffer->last_SRpnt;
681 STbuffer->last_SRpnt = NULL;
682 SRpnt->waiting = NULL;
683
684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
685 st_release_request(SRpnt);
686
687 STbuffer->buffer_bytes -= STbuffer->writing;
688 STps = &(STp->ps[STp->partition]);
689 if (STps->drv_block >= 0) {
690 if (STp->block_size == 0)
691 STps->drv_block++;
692 else
693 STps->drv_block += STbuffer->writing / STp->block_size;
694 }
695
696 cmdstatp = &STbuffer->cmdstat;
697 if (STbuffer->syscall_result) {
698 retval = -EIO;
699 if (cmdstatp->have_sense && !cmdstatp->deferred &&
700 (cmdstatp->flags & SENSE_EOM) &&
701 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
703 /* EOM at write-behind, has all data been written? */
704 if (!cmdstatp->remainder_valid ||
705 cmdstatp->uremainder64 == 0)
706 retval = -ENOSPC;
707 }
708 if (retval == -EIO)
709 STps->drv_block = -1;
710 }
711 STbuffer->writing = 0;
712
713 DEB(if (debugging && retval)
714 st_printk(ST_DEB_MSG, STp,
715 "Async write error %x, return value %d.\n",
716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
717
718 return retval;
719}
720
721
722/* Step over EOF if it has been inadvertently crossed (ioctl not used because
723 it messes up the block number). */
724static int cross_eof(struct scsi_tape * STp, int forward)
725{
726 struct st_request *SRpnt;
727 unsigned char cmd[MAX_COMMAND_SIZE];
728
729 cmd[0] = SPACE;
730 cmd[1] = 0x01; /* Space FileMarks */
731 if (forward) {
732 cmd[2] = cmd[3] = 0;
733 cmd[4] = 1;
734 } else
735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
736 cmd[5] = 0;
737
738 DEBC_printk(STp, "Stepping over filemark %s.\n",
739 forward ? "forward" : "backward");
740
741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
742 STp->device->request_queue->rq_timeout,
743 MAX_RETRIES, 1);
744 if (!SRpnt)
745 return (STp->buffer)->syscall_result;
746
747 st_release_request(SRpnt);
748 SRpnt = NULL;
749
750 if ((STp->buffer)->cmdstat.midlevel_result != 0)
751 st_printk(KERN_ERR, STp,
752 "Stepping over filemark %s failed.\n",
753 forward ? "forward" : "backward");
754
755 return (STp->buffer)->syscall_result;
756}
757
758
759/* Flush the write buffer (never need to write if variable blocksize). */
760static int st_flush_write_buffer(struct scsi_tape * STp)
761{
762 int transfer, blks;
763 int result;
764 unsigned char cmd[MAX_COMMAND_SIZE];
765 struct st_request *SRpnt;
766 struct st_partstat *STps;
767
768 result = write_behind_check(STp);
769 if (result)
770 return result;
771
772 result = 0;
773 if (STp->dirty == 1) {
774
775 transfer = STp->buffer->buffer_bytes;
776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
777
778 memset(cmd, 0, MAX_COMMAND_SIZE);
779 cmd[0] = WRITE_6;
780 cmd[1] = 1;
781 blks = transfer / STp->block_size;
782 cmd[2] = blks >> 16;
783 cmd[3] = blks >> 8;
784 cmd[4] = blks;
785
786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
787 STp->device->request_queue->rq_timeout,
788 MAX_WRITE_RETRIES, 1);
789 if (!SRpnt)
790 return (STp->buffer)->syscall_result;
791
792 STps = &(STp->ps[STp->partition]);
793 if ((STp->buffer)->syscall_result != 0) {
794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
795
796 if (cmdstatp->have_sense && !cmdstatp->deferred &&
797 (cmdstatp->flags & SENSE_EOM) &&
798 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
800 (!cmdstatp->remainder_valid ||
801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
802 STp->dirty = 0;
803 (STp->buffer)->buffer_bytes = 0;
804 if (STps->drv_block >= 0)
805 STps->drv_block += blks;
806 result = (-ENOSPC);
807 } else {
808 st_printk(KERN_ERR, STp, "Error on flush.\n");
809 STps->drv_block = (-1);
810 result = (-EIO);
811 }
812 } else {
813 if (STps->drv_block >= 0)
814 STps->drv_block += blks;
815 STp->dirty = 0;
816 (STp->buffer)->buffer_bytes = 0;
817 }
818 st_release_request(SRpnt);
819 SRpnt = NULL;
820 }
821 return result;
822}
823
824
825/* Flush the tape buffer. The tape will be positioned correctly unless
826 seek_next is true. */
827static int flush_buffer(struct scsi_tape *STp, int seek_next)
828{
829 int backspace, result;
830 struct st_buffer *STbuffer;
831 struct st_partstat *STps;
832
833 STbuffer = STp->buffer;
834
835 /*
836 * If there was a bus reset, block further access
837 * to this device.
838 */
839 if (STp->pos_unknown)
840 return (-EIO);
841
842 if (STp->ready != ST_READY)
843 return 0;
844 STps = &(STp->ps[STp->partition]);
845 if (STps->rw == ST_WRITING) /* Writing */
846 return st_flush_write_buffer(STp);
847
848 if (STp->block_size == 0)
849 return 0;
850
851 backspace = ((STp->buffer)->buffer_bytes +
852 (STp->buffer)->read_pointer) / STp->block_size -
853 ((STp->buffer)->read_pointer + STp->block_size - 1) /
854 STp->block_size;
855 (STp->buffer)->buffer_bytes = 0;
856 (STp->buffer)->read_pointer = 0;
857 result = 0;
858 if (!seek_next) {
859 if (STps->eof == ST_FM_HIT) {
860 result = cross_eof(STp, 0); /* Back over the EOF hit */
861 if (!result)
862 STps->eof = ST_NOEOF;
863 else {
864 if (STps->drv_file >= 0)
865 STps->drv_file++;
866 STps->drv_block = 0;
867 }
868 }
869 if (!result && backspace > 0)
870 result = st_int_ioctl(STp, MTBSR, backspace);
871 } else if (STps->eof == ST_FM_HIT) {
872 if (STps->drv_file >= 0)
873 STps->drv_file++;
874 STps->drv_block = 0;
875 STps->eof = ST_NOEOF;
876 }
877 return result;
878
879}
880
881/* Set the mode parameters */
882static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
883{
884 int set_it = 0;
885 unsigned long arg;
886
887 if (!STp->density_changed &&
888 STm->default_density >= 0 &&
889 STm->default_density != STp->density) {
890 arg = STm->default_density;
891 set_it = 1;
892 } else
893 arg = STp->density;
894 arg <<= MT_ST_DENSITY_SHIFT;
895 if (!STp->blksize_changed &&
896 STm->default_blksize >= 0 &&
897 STm->default_blksize != STp->block_size) {
898 arg |= STm->default_blksize;
899 set_it = 1;
900 } else
901 arg |= STp->block_size;
902 if (set_it &&
903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
904 st_printk(KERN_WARNING, STp,
905 "Can't set default block size to %d bytes "
906 "and density %x.\n",
907 STm->default_blksize, STm->default_density);
908 if (modes_defined)
909 return (-EINVAL);
910 }
911 return 0;
912}
913
914
915/* Lock or unlock the drive door. Don't use when st_request allocated. */
916static int do_door_lock(struct scsi_tape * STp, int do_lock)
917{
918 int retval;
919
920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
921
922 retval = scsi_set_medium_removal(STp->device,
923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
924 if (!retval)
925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
926 else
927 STp->door_locked = ST_LOCK_FAILS;
928 return retval;
929}
930
931
932/* Set the internal state after reset */
933static void reset_state(struct scsi_tape *STp)
934{
935 int i;
936 struct st_partstat *STps;
937
938 STp->pos_unknown = 0;
939 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
940 STps = &(STp->ps[i]);
941 STps->rw = ST_IDLE;
942 STps->eof = ST_NOEOF;
943 STps->at_sm = 0;
944 STps->last_block_valid = 0;
945 STps->drv_block = -1;
946 STps->drv_file = -1;
947 }
948 if (STp->can_partitions) {
949 STp->partition = find_partition(STp);
950 if (STp->partition < 0)
951 STp->partition = 0;
952 STp->new_partition = STp->partition;
953 }
954}
955
956/* Test if the drive is ready. Returns either one of the codes below or a negative system
957 error code. */
958#define CHKRES_READY 0
959#define CHKRES_NEW_SESSION 1
960#define CHKRES_NOT_READY 2
961#define CHKRES_NO_TAPE 3
962
963#define MAX_ATTENTIONS 10
964
965static int test_ready(struct scsi_tape *STp, int do_wait)
966{
967 int attentions, waits, max_wait, scode;
968 int retval = CHKRES_READY, new_session = 0;
969 unsigned char cmd[MAX_COMMAND_SIZE];
970 struct st_request *SRpnt = NULL;
971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
972
973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
974
975 for (attentions=waits=0; ; ) {
976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
977 cmd[0] = TEST_UNIT_READY;
978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
979 STp->long_timeout, MAX_READY_RETRIES, 1);
980
981 if (!SRpnt) {
982 retval = (STp->buffer)->syscall_result;
983 break;
984 }
985
986 if (cmdstatp->have_sense) {
987
988 scode = cmdstatp->sense_hdr.sense_key;
989
990 if (scode == UNIT_ATTENTION) { /* New media? */
991 new_session = 1;
992 if (attentions < MAX_ATTENTIONS) {
993 attentions++;
994 continue;
995 }
996 else {
997 retval = (-EIO);
998 break;
999 }
1000 }
1001
1002 if (scode == NOT_READY) {
1003 if (waits < max_wait) {
1004 if (msleep_interruptible(1000)) {
1005 retval = (-EINTR);
1006 break;
1007 }
1008 waits++;
1009 continue;
1010 }
1011 else {
1012 if ((STp->device)->scsi_level >= SCSI_2 &&
1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1014 retval = CHKRES_NO_TAPE;
1015 else
1016 retval = CHKRES_NOT_READY;
1017 break;
1018 }
1019 }
1020 }
1021
1022 retval = (STp->buffer)->syscall_result;
1023 if (!retval)
1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1025 break;
1026 }
1027
1028 if (SRpnt != NULL)
1029 st_release_request(SRpnt);
1030 return retval;
1031}
1032
1033
1034/* See if the drive is ready and gather information about the tape. Return values:
1035 < 0 negative error code from errno.h
1036 0 drive ready
1037 1 drive not ready (possibly no tape)
1038*/
1039static int check_tape(struct scsi_tape *STp, struct file *filp)
1040{
1041 int i, retval, new_session = 0, do_wait;
1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1043 unsigned short st_flags = filp->f_flags;
1044 struct st_request *SRpnt = NULL;
1045 struct st_modedef *STm;
1046 struct st_partstat *STps;
1047 struct inode *inode = file_inode(filp);
1048 int mode = TAPE_MODE(inode);
1049
1050 STp->ready = ST_READY;
1051
1052 if (mode != STp->current_mode) {
1053 DEBC_printk(STp, "Mode change from %d to %d.\n",
1054 STp->current_mode, mode);
1055 new_session = 1;
1056 STp->current_mode = mode;
1057 }
1058 STm = &(STp->modes[STp->current_mode]);
1059
1060 saved_cleaning = STp->cleaning_req;
1061 STp->cleaning_req = 0;
1062
1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1064 retval = test_ready(STp, do_wait);
1065
1066 if (retval < 0)
1067 goto err_out;
1068
1069 if (retval == CHKRES_NEW_SESSION) {
1070 STp->pos_unknown = 0;
1071 STp->partition = STp->new_partition = 0;
1072 if (STp->can_partitions)
1073 STp->nbr_partitions = 1; /* This guess will be updated later
1074 if necessary */
1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1076 STps = &(STp->ps[i]);
1077 STps->rw = ST_IDLE;
1078 STps->eof = ST_NOEOF;
1079 STps->at_sm = 0;
1080 STps->last_block_valid = 0;
1081 STps->drv_block = 0;
1082 STps->drv_file = 0;
1083 }
1084 new_session = 1;
1085 }
1086 else {
1087 STp->cleaning_req |= saved_cleaning;
1088
1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1090 if (retval == CHKRES_NO_TAPE)
1091 STp->ready = ST_NO_TAPE;
1092 else
1093 STp->ready = ST_NOT_READY;
1094
1095 STp->density = 0; /* Clear the erroneous "residue" */
1096 STp->write_prot = 0;
1097 STp->block_size = 0;
1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1099 STp->partition = STp->new_partition = 0;
1100 STp->door_locked = ST_UNLOCKED;
1101 return CHKRES_NOT_READY;
1102 }
1103 }
1104
1105 if (STp->omit_blklims)
1106 STp->min_block = STp->max_block = (-1);
1107 else {
1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1109 cmd[0] = READ_BLOCK_LIMITS;
1110
1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1112 STp->device->request_queue->rq_timeout,
1113 MAX_READY_RETRIES, 1);
1114 if (!SRpnt) {
1115 retval = (STp->buffer)->syscall_result;
1116 goto err_out;
1117 }
1118
1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1123 (STp->buffer)->b_data[5];
1124 if ( DEB( debugging || ) !STp->inited)
1125 st_printk(KERN_INFO, STp,
1126 "Block limits %d - %d bytes.\n",
1127 STp->min_block, STp->max_block);
1128 } else {
1129 STp->min_block = STp->max_block = (-1);
1130 DEBC_printk(STp, "Can't read block limits.\n");
1131 }
1132 }
1133
1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1135 cmd[0] = MODE_SENSE;
1136 cmd[4] = 12;
1137
1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1139 STp->device->request_queue->rq_timeout,
1140 MAX_READY_RETRIES, 1);
1141 if (!SRpnt) {
1142 retval = (STp->buffer)->syscall_result;
1143 goto err_out;
1144 }
1145
1146 if ((STp->buffer)->syscall_result != 0) {
1147 DEBC_printk(STp, "No Mode Sense.\n");
1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1150 STp->drv_write_prot = 0;
1151 } else {
1152 DEBC_printk(STp,"Mode sense. Length %d, "
1153 "medium %x, WBS %x, BLL %d\n",
1154 (STp->buffer)->b_data[0],
1155 (STp->buffer)->b_data[1],
1156 (STp->buffer)->b_data[2],
1157 (STp->buffer)->b_data[3]);
1158
1159 if ((STp->buffer)->b_data[3] >= 8) {
1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1161 STp->density = (STp->buffer)->b_data[4];
1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1164 DEBC_printk(STp, "Density %x, tape length: %x, "
1165 "drv buffer: %d\n",
1166 STp->density,
1167 (STp->buffer)->b_data[5] * 65536 +
1168 (STp->buffer)->b_data[6] * 256 +
1169 (STp->buffer)->b_data[7],
1170 STp->drv_buffer);
1171 }
1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1173 if (!STp->drv_buffer && STp->immediate_filemark) {
1174 st_printk(KERN_WARNING, STp,
1175 "non-buffered tape: disabling "
1176 "writing immediate filemarks\n");
1177 STp->immediate_filemark = 0;
1178 }
1179 }
1180 st_release_request(SRpnt);
1181 SRpnt = NULL;
1182 STp->inited = 1;
1183
1184 if (STp->block_size > 0)
1185 (STp->buffer)->buffer_blocks =
1186 (STp->buffer)->buffer_size / STp->block_size;
1187 else
1188 (STp->buffer)->buffer_blocks = 1;
1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1190
1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1192 STp->block_size, (STp->buffer)->buffer_size,
1193 (STp->buffer)->buffer_blocks);
1194
1195 if (STp->drv_write_prot) {
1196 STp->write_prot = 1;
1197
1198 DEBC_printk(STp, "Write protected\n");
1199
1200 if (do_wait &&
1201 ((st_flags & O_ACCMODE) == O_WRONLY ||
1202 (st_flags & O_ACCMODE) == O_RDWR)) {
1203 retval = (-EROFS);
1204 goto err_out;
1205 }
1206 }
1207
1208 if (STp->can_partitions && STp->nbr_partitions < 1) {
1209 /* This code is reached when the device is opened for the first time
1210 after the driver has been initialized with tape in the drive and the
1211 partition support has been enabled. */
1212 DEBC_printk(STp, "Updating partition number in status.\n");
1213 if ((STp->partition = find_partition(STp)) < 0) {
1214 retval = STp->partition;
1215 goto err_out;
1216 }
1217 STp->new_partition = STp->partition;
1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1219 }
1220
1221 if (new_session) { /* Change the drive parameters for the new mode */
1222 STp->density_changed = STp->blksize_changed = 0;
1223 STp->compression_changed = 0;
1224 if (!(STm->defaults_for_writes) &&
1225 (retval = set_mode_densblk(STp, STm)) < 0)
1226 goto err_out;
1227
1228 if (STp->default_drvbuffer != 0xff) {
1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1230 st_printk(KERN_WARNING, STp,
1231 "Can't set default drive "
1232 "buffering to %d.\n",
1233 STp->default_drvbuffer);
1234 }
1235 }
1236
1237 return CHKRES_READY;
1238
1239 err_out:
1240 return retval;
1241}
1242
1243
1244 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1245 module count. */
1246static int st_open(struct inode *inode, struct file *filp)
1247{
1248 int i, retval = (-EIO);
1249 int resumed = 0;
1250 struct scsi_tape *STp;
1251 struct st_partstat *STps;
1252 int dev = TAPE_NR(inode);
1253
1254 /*
1255 * We really want to do nonseekable_open(inode, filp); here, but some
1256 * versions of tar incorrectly call lseek on tapes and bail out if that
1257 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1258 */
1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1260
1261 if (!(STp = scsi_tape_get(dev))) {
1262 return -ENXIO;
1263 }
1264
1265 filp->private_data = STp;
1266
1267 spin_lock(&st_use_lock);
1268 if (STp->in_use) {
1269 spin_unlock(&st_use_lock);
1270 scsi_tape_put(STp);
1271 DEBC_printk(STp, "Device already in use.\n");
1272 return (-EBUSY);
1273 }
1274
1275 STp->in_use = 1;
1276 spin_unlock(&st_use_lock);
1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1278
1279 if (scsi_autopm_get_device(STp->device) < 0) {
1280 retval = -EIO;
1281 goto err_out;
1282 }
1283 resumed = 1;
1284 if (!scsi_block_when_processing_errors(STp->device)) {
1285 retval = (-ENXIO);
1286 goto err_out;
1287 }
1288
1289 /* See that we have at least a one page buffer available */
1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1291 st_printk(KERN_WARNING, STp,
1292 "Can't allocate one page tape buffer.\n");
1293 retval = (-EOVERFLOW);
1294 goto err_out;
1295 }
1296
1297 (STp->buffer)->cleared = 0;
1298 (STp->buffer)->writing = 0;
1299 (STp->buffer)->syscall_result = 0;
1300
1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1302
1303 STp->dirty = 0;
1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1305 STps = &(STp->ps[i]);
1306 STps->rw = ST_IDLE;
1307 }
1308 STp->try_dio_now = STp->try_dio;
1309 STp->recover_count = 0;
1310 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1312
1313 retval = check_tape(STp, filp);
1314 if (retval < 0)
1315 goto err_out;
1316 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1317 retval != CHKRES_READY) {
1318 if (STp->ready == NO_TAPE)
1319 retval = (-ENOMEDIUM);
1320 else
1321 retval = (-EIO);
1322 goto err_out;
1323 }
1324 return 0;
1325
1326 err_out:
1327 normalize_buffer(STp->buffer);
1328 spin_lock(&st_use_lock);
1329 STp->in_use = 0;
1330 spin_unlock(&st_use_lock);
1331 if (resumed)
1332 scsi_autopm_put_device(STp->device);
1333 scsi_tape_put(STp);
1334 return retval;
1335
1336}
1337
1338
1339/* Flush the tape buffer before close */
1340static int st_flush(struct file *filp, fl_owner_t id)
1341{
1342 int result = 0, result2;
1343 unsigned char cmd[MAX_COMMAND_SIZE];
1344 struct st_request *SRpnt;
1345 struct scsi_tape *STp = filp->private_data;
1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1347 struct st_partstat *STps = &(STp->ps[STp->partition]);
1348
1349 if (file_count(filp) > 1)
1350 return 0;
1351
1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1353 result = st_flush_write_buffer(STp);
1354 if (result != 0 && result != (-ENOSPC))
1355 goto out;
1356 }
1357
1358 if (STp->can_partitions &&
1359 (result2 = switch_partition(STp)) < 0) {
1360 DEBC_printk(STp, "switch_partition at close failed.\n");
1361 if (result == 0)
1362 result = result2;
1363 goto out;
1364 }
1365
1366 DEBC( if (STp->nbr_requests)
1367 st_printk(KERN_DEBUG, STp,
1368 "Number of r/w requests %d, dio used in %d, "
1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1370 STp->nbr_pages));
1371
1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1374
1375#if DEBUG
1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1377 STp->nbr_waits, STp->nbr_finished);
1378#endif
1379 memset(cmd, 0, MAX_COMMAND_SIZE);
1380 cmd[0] = WRITE_FILEMARKS;
1381 if (STp->immediate_filemark)
1382 cmd[1] = 1;
1383 cmd[4] = 1 + STp->two_fm;
1384
1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1386 STp->device->request_queue->rq_timeout,
1387 MAX_WRITE_RETRIES, 1);
1388 if (!SRpnt) {
1389 result = (STp->buffer)->syscall_result;
1390 goto out;
1391 }
1392
1393 if (STp->buffer->syscall_result == 0 ||
1394 (cmdstatp->have_sense && !cmdstatp->deferred &&
1395 (cmdstatp->flags & SENSE_EOM) &&
1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1399 /* Write successful at EOM */
1400 st_release_request(SRpnt);
1401 SRpnt = NULL;
1402 if (STps->drv_file >= 0)
1403 STps->drv_file++;
1404 STps->drv_block = 0;
1405 if (STp->two_fm)
1406 cross_eof(STp, 0);
1407 STps->eof = ST_FM;
1408 }
1409 else { /* Write error */
1410 st_release_request(SRpnt);
1411 SRpnt = NULL;
1412 st_printk(KERN_ERR, STp,
1413 "Error on write filemark.\n");
1414 if (result == 0)
1415 result = (-EIO);
1416 }
1417
1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1419 } else if (!STp->rew_at_close) {
1420 STps = &(STp->ps[STp->partition]);
1421 if (!STm->sysv || STps->rw != ST_READING) {
1422 if (STp->can_bsr)
1423 result = flush_buffer(STp, 0);
1424 else if (STps->eof == ST_FM_HIT) {
1425 result = cross_eof(STp, 0);
1426 if (result) {
1427 if (STps->drv_file >= 0)
1428 STps->drv_file++;
1429 STps->drv_block = 0;
1430 STps->eof = ST_FM;
1431 } else
1432 STps->eof = ST_NOEOF;
1433 }
1434 } else if ((STps->eof == ST_NOEOF &&
1435 !(result = cross_eof(STp, 1))) ||
1436 STps->eof == ST_FM_HIT) {
1437 if (STps->drv_file >= 0)
1438 STps->drv_file++;
1439 STps->drv_block = 0;
1440 STps->eof = ST_FM;
1441 }
1442 }
1443
1444 out:
1445 if (STp->rew_at_close) {
1446 result2 = st_int_ioctl(STp, MTREW, 1);
1447 if (result == 0)
1448 result = result2;
1449 }
1450 return result;
1451}
1452
1453
1454/* Close the device and release it. BKL is not needed: this is the only thread
1455 accessing this tape. */
1456static int st_release(struct inode *inode, struct file *filp)
1457{
1458 int result = 0;
1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
1465 spin_lock(&st_use_lock);
1466 STp->in_use = 0;
1467 spin_unlock(&st_use_lock);
1468 scsi_autopm_put_device(STp->device);
1469 scsi_tape_put(STp);
1470
1471 return result;
1472}
1473
1474/* The checks common to both reading and writing */
1475static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476{
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
1516 DEB(
1517 if (!STp->in_use) {
1518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
1520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545{
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
1550 i = STp->try_dio_now && try_rdio;
1551 else
1552 i = STp->try_dio_now && try_wdio;
1553
1554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
1558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
1565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
1569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
1579 else {
1580 bufsize = count;
1581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
1587 if (bufsize > STbp->buffer_size &&
1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
1592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601}
1602
1603
1604/* Can be called more than once after each setup_buffer() */
1605static void release_buffering(struct scsi_tape *STp, int is_read)
1606{
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1612 STbp->do_dio = 0;
1613 STbp->sg_segs = 0;
1614 }
1615}
1616
1617
1618/* Write command */
1619static ssize_t
1620st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621{
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
1629 struct st_request *SRpnt = NULL;
1630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
1634
1635 if (mutex_lock_interruptible(&STp->lock))
1636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
1646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
1673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
1777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
1781 if (async_write && !STbp->syscall_result) {
1782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
1793 DEBC_printk(STp, "Error on write:\n");
1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
1808 b_point -= undone;
1809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
1820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
1823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
1835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
1839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
1849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
1851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
1856 retval = STbp->syscall_result;
1857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
1886 st_release_request(SRpnt);
1887 release_buffering(STp, 0);
1888 mutex_unlock(&STp->lock);
1889
1890 return retval;
1891}
1892
1893/* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898*/
1899static long read_tape(struct scsi_tape *STp, long count,
1900 struct st_request ** aSRpnt)
1901{
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
1904 struct st_request *SRpnt;
1905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
1909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
1937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
1939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
1947 release_buffering(STp, 1);
1948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
1960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
1966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
1977 if (STp->block_size == 0 &&
1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1979 transfer = bytes;
1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
1995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
1997 st_release_request(SRpnt);
1998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
2000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
2003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
2011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
2016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
2031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
2034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
2045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
2048 }
2049 }
2050 /* end of EOF, EOM, ILI test */
2051 else { /* nonzero sense key */
2052 DEBC_printk(STp, "Tape error while reading.\n");
2053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
2067 /* End of extended sense test */
2068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
2073 /* End of error handling */
2074 else { /* Read successful */
2075 STbp->buffer_bytes = bytes;
2076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
2079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087}
2088
2089
2090/* Read command */
2091static ssize_t
2092st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093{
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
2098 struct st_request *SRpnt = NULL;
2099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
2103
2104 if (mutex_lock_interruptible(&STp->lock))
2105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
2127 DEB(
2128 if (debugging && STps->eof != ST_NOEOF)
2129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
2133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
2179 DEB(
2180 if (debugging && STps->eof != ST_NOEOF)
2181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
2186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
2225 st_release_request(SRpnt);
2226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
2229 release_buffering(STp, 1);
2230 STbp->buffer_bytes = 0;
2231 }
2232 mutex_unlock(&STp->lock);
2233
2234 return retval;
2235}
2236
2237
2238
2239DEB(
2240/* Set the driver options */
2241static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2242{
2243 if (debugging) {
2244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2265 }
2266}
2267 )
2268
2269
2270static int st_set_options(struct scsi_tape *STp, long options)
2271{
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
2275 struct cdev *cd0, *cd1;
2276 struct device *d0, *d1;
2277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
2280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
2289 modes_defined = 1;
2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
2292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2310 STm->sysv = (options & MT_ST_SYSV) != 0;
2311 STp->sili = (options & MT_ST_SILI) != 0;
2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2313 st_log_options(STp, STm); )
2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
2341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
2343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
2345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
2347 DEB(
2348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
2350 st_log_options(STp, STm); )
2351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
2357 DEBC_printk(STp, "Default block size disabled.\n");
2358 } else {
2359 STm->default_blksize = value;
2360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
2362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
2373 } else {
2374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
2378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
2382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
2384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
2388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
2391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
2397 DEBC_printk(STp,
2398 "Density default disabled.\n");
2399 } else {
2400 STm->default_density = value & 0xff;
2401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
2403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
2411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
2413 } else {
2414 STp->default_drvbuffer = value & 7;
2415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
2418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
2424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
2426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
2429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
2432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
2438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449}
2450
2451#define MODE_HEADER_LENGTH 4
2452
2453/* Mode header and page byte offsets */
2454#define MH_OFF_DATA_LENGTH 0
2455#define MH_OFF_MEDIUM_TYPE 1
2456#define MH_OFF_DEV_SPECIFIC 2
2457#define MH_OFF_BDESCS_LENGTH 3
2458#define MP_OFF_PAGE_NBR 0
2459#define MP_OFF_PAGE_LENGTH 1
2460
2461/* Mode header and page bit masks */
2462#define MH_BIT_WP 0x80
2463#define MP_MSK_PAGE_NBR 0x3f
2464
2465/* Don't return block descriptors */
2466#define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468#define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470/* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474{
2475 unsigned char cmd[MAX_COMMAND_SIZE];
2476 struct st_request *SRpnt;
2477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
2489
2490 st_release_request(SRpnt);
2491
2492 return STp->buffer->syscall_result;
2493}
2494
2495
2496/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499{
2500 int pgo;
2501 unsigned char cmd[MAX_COMMAND_SIZE];
2502 struct st_request *SRpnt;
2503 int timeout;
2504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
2517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
2523
2524 st_release_request(SRpnt);
2525
2526 return STp->buffer->syscall_result;
2527}
2528
2529
2530#define COMPRESSION_PAGE 0x0f
2531#define COMPRESSION_PAGE_LENGTH 16
2532
2533#define CP_OFF_DCE_DCC 2
2534#define CP_OFF_C_ALGO 7
2535
2536#define DCE_MASK 0x80
2537#define DCC_MASK 0x40
2538#define RED_MASK 0x60
2539
2540
2541/* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547static int st_compression(struct scsi_tape * STp, int state)
2548{
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
2552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
2559 DEBC_printk(STp, "Compression mode page not supported.\n");
2560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2569 DEBC_printk(STp, "Compression not supported.\n");
2570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
2587 DEBC_printk(STp, "Compression change failed.\n");
2588 return (-EIO);
2589 }
2590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2591
2592 STp->compression_changed = 1;
2593 return 0;
2594}
2595
2596
2597/* Process the load and unload commands (does unload if the load code is zero) */
2598static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599{
2600 int retval = (-EIO), timeout;
2601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
2603 struct st_request *SRpnt;
2604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
2628 timeout = STp->device->request_queue->rq_timeout;
2629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2636 else
2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2638 );
2639
2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
2642 if (!SRpnt)
2643 return (STp->buffer)->syscall_result;
2644
2645 retval = (STp->buffer)->syscall_result;
2646 st_release_request(SRpnt);
2647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667}
2668
2669#if DEBUG
2670#define ST_DEB_FORWARD 0
2671#define ST_DEB_BACKWARD 1
2672static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2673{
2674 s32 sc;
2675
2676 if (!debugging)
2677 return;
2678
2679 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2681 if (direction)
2682 sc = -sc;
2683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2684 direction ? "backward" : "forward", sc, units);
2685}
2686#else
2687#define ST_DEB_FORWARD 0
2688#define ST_DEB_BACKWARD 1
2689static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2690#endif
2691
2692
2693/* Internal ioctl function */
2694static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2695{
2696 int timeout;
2697 long ltmp;
2698 int ioctl_result;
2699 int chg_eof = 1;
2700 unsigned char cmd[MAX_COMMAND_SIZE];
2701 struct st_request *SRpnt;
2702 struct st_partstat *STps;
2703 int fileno, blkno, at_sm, undone;
2704 int datalen = 0, direction = DMA_NONE;
2705
2706 WARN_ON(STp->buffer->do_dio != 0);
2707 if (STp->ready != ST_READY) {
2708 if (STp->ready == ST_NO_TAPE)
2709 return (-ENOMEDIUM);
2710 else
2711 return (-EIO);
2712 }
2713 timeout = STp->long_timeout;
2714 STps = &(STp->ps[STp->partition]);
2715 fileno = STps->drv_file;
2716 blkno = STps->drv_block;
2717 at_sm = STps->at_sm;
2718
2719 memset(cmd, 0, MAX_COMMAND_SIZE);
2720 switch (cmd_in) {
2721 case MTFSFM:
2722 chg_eof = 0; /* Changed from the FSF after this */
2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
2737 case MTBSF:
2738 cmd[0] = SPACE;
2739 cmd[1] = 0x01; /* Space FileMarks */
2740 ltmp = (-arg);
2741 cmd[2] = (ltmp >> 16);
2742 cmd[3] = (ltmp >> 8);
2743 cmd[4] = ltmp;
2744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2745 if (fileno >= 0)
2746 fileno -= arg;
2747 blkno = (-1); /* We can't know the block number */
2748 at_sm &= (arg == 0);
2749 break;
2750 case MTFSR:
2751 cmd[0] = SPACE;
2752 cmd[1] = 0x00; /* Space Blocks */
2753 cmd[2] = (arg >> 16);
2754 cmd[3] = (arg >> 8);
2755 cmd[4] = arg;
2756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2757 if (blkno >= 0)
2758 blkno += arg;
2759 at_sm &= (arg == 0);
2760 break;
2761 case MTBSR:
2762 cmd[0] = SPACE;
2763 cmd[1] = 0x00; /* Space Blocks */
2764 ltmp = (-arg);
2765 cmd[2] = (ltmp >> 16);
2766 cmd[3] = (ltmp >> 8);
2767 cmd[4] = ltmp;
2768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2769 if (blkno >= 0)
2770 blkno -= arg;
2771 at_sm &= (arg == 0);
2772 break;
2773 case MTFSS:
2774 cmd[0] = SPACE;
2775 cmd[1] = 0x04; /* Space Setmarks */
2776 cmd[2] = (arg >> 16);
2777 cmd[3] = (arg >> 8);
2778 cmd[4] = arg;
2779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2780 if (arg != 0) {
2781 blkno = fileno = (-1);
2782 at_sm = 1;
2783 }
2784 break;
2785 case MTBSS:
2786 cmd[0] = SPACE;
2787 cmd[1] = 0x04; /* Space Setmarks */
2788 ltmp = (-arg);
2789 cmd[2] = (ltmp >> 16);
2790 cmd[3] = (ltmp >> 8);
2791 cmd[4] = ltmp;
2792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2793 if (arg != 0) {
2794 blkno = fileno = (-1);
2795 at_sm = 1;
2796 }
2797 break;
2798 case MTWEOF:
2799 case MTWEOFI:
2800 case MTWSM:
2801 if (STp->write_prot)
2802 return (-EACCES);
2803 cmd[0] = WRITE_FILEMARKS;
2804 if (cmd_in == MTWSM)
2805 cmd[1] = 2;
2806 if (cmd_in == MTWEOFI ||
2807 (cmd_in == MTWEOF && STp->immediate_filemark))
2808 cmd[1] |= 1;
2809 cmd[2] = (arg >> 16);
2810 cmd[3] = (arg >> 8);
2811 cmd[4] = arg;
2812 timeout = STp->device->request_queue->rq_timeout;
2813 DEBC(
2814 if (cmd_in != MTWSM)
2815 st_printk(ST_DEB_MSG, STp,
2816 "Writing %d filemarks.\n",
2817 cmd[2] * 65536 +
2818 cmd[3] * 256 +
2819 cmd[4]);
2820 else
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d setmarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 )
2827 if (fileno >= 0)
2828 fileno += arg;
2829 blkno = 0;
2830 at_sm = (cmd_in == MTWSM);
2831 break;
2832 case MTREW:
2833 cmd[0] = REZERO_UNIT;
2834 if (STp->immediate) {
2835 cmd[1] = 1; /* Don't wait for completion */
2836 timeout = STp->device->request_queue->rq_timeout;
2837 }
2838 DEBC_printk(STp, "Rewinding tape.\n");
2839 fileno = blkno = at_sm = 0;
2840 break;
2841 case MTNOP:
2842 DEBC_printk(STp, "No op on tape.\n");
2843 return 0; /* Should do something ? */
2844 break;
2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
2849 timeout = STp->device->request_queue->rq_timeout;
2850 }
2851 cmd[4] = 3;
2852 DEBC_printk(STp, "Retensioning tape.\n");
2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
2881 timeout = STp->device->request_queue->rq_timeout;
2882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
2886 DEBC_printk(STp, "Erasing tape.\n");
2887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
2933 timeout = STp->device->request_queue->rq_timeout;
2934 DEBC(
2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
2945 if (cmd_in == MTSETDRVBUFFER)
2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
2949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
2957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
2960 ioctl_result = (STp->buffer)->syscall_result;
2961
2962 if (!ioctl_result) { /* SCSI command successful */
2963 st_release_request(SRpnt);
2964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
2977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3014 cmdstatp->have_sense &&
3015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
3026 STps->drv_file = fileno;
3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3078 st_release_request(SRpnt);
3079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
3088 st_release_request(SRpnt);
3089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093}
3094
3095
3096/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101{
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
3104 struct st_request *SRpnt;
3105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
3121 if (!SRpnt)
3122 return (STp->buffer)->syscall_result;
3123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
3128 DEBC_printk(STp, " Can't read tape position.\n");
3129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
3149 }
3150 st_release_request(SRpnt);
3151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161{
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
3167 struct st_request *SRpnt;
3168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
3176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
3189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
3192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
3213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
3216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
3220 timeout = STp->device->request_queue->rq_timeout;
3221 }
3222
3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
3225 if (!SRpnt)
3226 return (STp->buffer)->syscall_result;
3227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
3251
3252 st_release_request(SRpnt);
3253 SRpnt = NULL;
3254
3255 return result;
3256}
3257
3258
3259/* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261static int find_partition(struct scsi_tape *STp)
3262{
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271}
3272
3273
3274/* Change the partition if necessary */
3275static int switch_partition(struct scsi_tape *STp)
3276{
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285}
3286
3287/* Functions for reading and writing the medium partition mode page. */
3288
3289#define PART_PAGE 0x11
3290#define PART_PAGE_FIXED_LENGTH 8
3291
3292#define PP_OFF_MAX_ADD_PARTS 2
3293#define PP_OFF_NBR_ADD_PARTS 3
3294#define PP_OFF_FLAGS 4
3295#define PP_OFF_PART_UNITS 6
3296#define PP_OFF_RESERVED 7
3297
3298#define PP_BIT_IDP 0x20
3299#define PP_BIT_FDP 0x80
3300#define PP_MSK_PSUM_MB 0x10
3301#define PP_MSK_PSUM_UNITS 0x18
3302#define PP_MSK_POFM 0x04
3303
3304/* Get the number of partitions on the tape. As a side effect reads the
3305 mode page into the tape buffer. */
3306static int nbr_partitions(struct scsi_tape *STp)
3307{
3308 int result;
3309
3310 if (STp->ready != ST_READY)
3311 return (-EIO);
3312
3313 result = read_mode_page(STp, PART_PAGE, 1);
3314
3315 if (result) {
3316 DEBC_printk(STp, "Can't read medium partition page.\n");
3317 result = (-EIO);
3318 } else {
3319 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3320 PP_OFF_NBR_ADD_PARTS] + 1;
3321 DEBC_printk(STp, "Number of partitions %d.\n", result);
3322 }
3323
3324 return result;
3325}
3326
3327
3328static int format_medium(struct scsi_tape *STp, int format)
3329{
3330 int result = 0;
3331 int timeout = STp->long_timeout;
3332 unsigned char scmd[MAX_COMMAND_SIZE];
3333 struct st_request *SRpnt;
3334
3335 memset(scmd, 0, MAX_COMMAND_SIZE);
3336 scmd[0] = FORMAT_UNIT;
3337 scmd[2] = format;
3338 if (STp->immediate) {
3339 scmd[1] |= 1; /* Don't wait for completion */
3340 timeout = STp->device->request_queue->rq_timeout;
3341 }
3342 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3343 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3344 timeout, MAX_RETRIES, 1);
3345 if (!SRpnt)
3346 result = STp->buffer->syscall_result;
3347 return result;
3348}
3349
3350
3351/* Partition the tape into two partitions if size > 0 or one partition if
3352 size == 0.
3353
3354 The block descriptors are read and written because Sony SDT-7000 does not
3355 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3356
3357 My HP C1533A drive returns only one partition size field. This is used to
3358 set the size of partition 1. There is no size field for the default partition.
3359 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3360 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3361 The following algorithm is used to accommodate both drives: if the number of
3362 partition size fields is greater than the maximum number of additional partitions
3363 in the mode page, the second field is used. Otherwise the first field is used.
3364
3365 For Seagate DDS drives the page length must be 8 when no partitions is defined
3366 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3367 is acceptable also to some other old drives and enforced if the first partition
3368 size field is used for the first additional partition size.
3369
3370 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3371 */
3372static int partition_tape(struct scsi_tape *STp, int size)
3373{
3374 int result;
3375 int target_partition;
3376 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3377 int pgo, psd_cnt, psdo;
3378 int psum = PP_MSK_PSUM_MB, units = 0;
3379 unsigned char *bp;
3380
3381 result = read_mode_page(STp, PART_PAGE, 0);
3382 if (result) {
3383 DEBC_printk(STp, "Can't read partition mode page.\n");
3384 return result;
3385 }
3386 target_partition = 1;
3387 if (size < 0) {
3388 target_partition = 0;
3389 size = -size;
3390 }
3391
3392 /* The mode page is in the buffer. Let's modify it and write it. */
3393 bp = (STp->buffer)->b_data;
3394 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3395 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3396 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3397
3398 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3399
3400 if (scsi3) {
3401 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3402 if (needs_format && size == 0) {
3403 /* No need to write the mode page when clearing
3404 * partitioning
3405 */
3406 DEBC_printk(STp, "Formatting tape with one partition.\n");
3407 result = format_medium(STp, 0);
3408 goto out;
3409 }
3410 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3411 psd_cnt = 2;
3412 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3413 /* Use units scaling for large partitions if the device
3414 * suggests it and no precision lost. Required for IBM
3415 * TS1140/50 drives that don't support MB units.
3416 */
3417 if (size >= 1000 && (size % 1000) == 0) {
3418 size /= 1000;
3419 psum = PP_MSK_PSUM_UNITS;
3420 units = 9; /* GB */
3421 }
3422 }
3423 /* Try it anyway if too large to specify in MB */
3424 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3425 size /= 1000;
3426 psum = PP_MSK_PSUM_UNITS;
3427 units = 9; /* GB */
3428 }
3429 }
3430
3431 if (size >= 65535 || /* Does not fit into two bytes */
3432 (target_partition == 0 && psd_cnt < 2)) {
3433 result = -EINVAL;
3434 goto out;
3435 }
3436
3437 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3438 /* The second condition is for HP DDS which use only one partition size
3439 * descriptor
3440 */
3441 if (target_partition > 0 &&
3442 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3443 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3444 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3445 psdo += 2;
3446 }
3447 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3448
3449 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3450 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3451 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3452
3453 if (size == 0) {
3454 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3455 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3456 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3457 DEBC_printk(STp, "Formatting tape with one partition.\n");
3458 } else {
3459 bp[psdo] = (size >> 8) & 0xff;
3460 bp[psdo + 1] = size & 0xff;
3461 if (target_partition == 0)
3462 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3463 bp[pgo + 3] = 1;
3464 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3465 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3466 DEBC_printk(STp,
3467 "Formatting tape with two partitions (%i = %d MB).\n",
3468 target_partition, units > 0 ? size * 1000 : size);
3469 }
3470 bp[pgo + PP_OFF_PART_UNITS] = 0;
3471 bp[pgo + PP_OFF_RESERVED] = 0;
3472 if (size != 1 || units != 0) {
3473 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3474 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3475 bp[pgo + PP_OFF_PART_UNITS] = units;
3476 } else
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3479 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3480
3481 result = write_mode_page(STp, PART_PAGE, 1);
3482
3483 if (!result && needs_format)
3484 result = format_medium(STp, 1);
3485
3486 if (result) {
3487 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3488 result = (-EIO);
3489 }
3490
3491out:
3492 return result;
3493}
3494
3495
3496
3497/* The ioctl command */
3498static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3499{
3500 int i, cmd_nr, cmd_type, bt;
3501 int retval = 0;
3502 unsigned int blk;
3503 struct scsi_tape *STp = file->private_data;
3504 struct st_modedef *STm;
3505 struct st_partstat *STps;
3506 void __user *p = (void __user *)arg;
3507
3508 if (mutex_lock_interruptible(&STp->lock))
3509 return -ERESTARTSYS;
3510
3511 DEB(
3512 if (debugging && !STp->in_use) {
3513 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3514 retval = (-EIO);
3515 goto out;
3516 } ) /* end DEB */
3517
3518 STm = &(STp->modes[STp->current_mode]);
3519 STps = &(STp->ps[STp->partition]);
3520
3521 /*
3522 * If we are in the middle of error recovery, don't let anyone
3523 * else try and use this device. Also, if error recovery fails, it
3524 * may try and take the device offline, in which case all further
3525 * access to the device is prohibited.
3526 */
3527 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3528 file->f_flags & O_NDELAY);
3529 if (retval)
3530 goto out;
3531
3532 cmd_type = _IOC_TYPE(cmd_in);
3533 cmd_nr = _IOC_NR(cmd_in);
3534
3535 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3536 struct mtop mtc;
3537
3538 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3539 retval = (-EINVAL);
3540 goto out;
3541 }
3542
3543 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3544 if (i) {
3545 retval = (-EFAULT);
3546 goto out;
3547 }
3548
3549 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3550 st_printk(KERN_WARNING, STp,
3551 "MTSETDRVBUFFER only allowed for root.\n");
3552 retval = (-EPERM);
3553 goto out;
3554 }
3555 if (!STm->defined &&
3556 (mtc.mt_op != MTSETDRVBUFFER &&
3557 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3558 retval = (-ENXIO);
3559 goto out;
3560 }
3561
3562 if (!STp->pos_unknown) {
3563
3564 if (STps->eof == ST_FM_HIT) {
3565 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3566 mtc.mt_op == MTEOM) {
3567 mtc.mt_count -= 1;
3568 if (STps->drv_file >= 0)
3569 STps->drv_file += 1;
3570 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3571 mtc.mt_count += 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 }
3575 }
3576
3577 if (mtc.mt_op == MTSEEK) {
3578 /* Old position must be restored if partition will be
3579 changed */
3580 i = !STp->can_partitions ||
3581 (STp->new_partition != STp->partition);
3582 } else {
3583 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3584 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3585 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3586 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3587 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3588 mtc.mt_op == MTCOMPRESSION;
3589 }
3590 i = flush_buffer(STp, i);
3591 if (i < 0) {
3592 retval = i;
3593 goto out;
3594 }
3595 if (STps->rw == ST_WRITING &&
3596 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3597 mtc.mt_op == MTSEEK ||
3598 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3599 i = st_int_ioctl(STp, MTWEOF, 1);
3600 if (i < 0) {
3601 retval = i;
3602 goto out;
3603 }
3604 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3605 mtc.mt_count++;
3606 STps->rw = ST_IDLE;
3607 }
3608
3609 } else {
3610 /*
3611 * If there was a bus reset, block further access
3612 * to this device. If the user wants to rewind the tape,
3613 * then reset the flag and allow access again.
3614 */
3615 if (mtc.mt_op != MTREW &&
3616 mtc.mt_op != MTOFFL &&
3617 mtc.mt_op != MTRETEN &&
3618 mtc.mt_op != MTERASE &&
3619 mtc.mt_op != MTSEEK &&
3620 mtc.mt_op != MTEOM) {
3621 retval = (-EIO);
3622 goto out;
3623 }
3624 reset_state(STp);
3625 /* remove this when the midlevel properly clears was_reset */
3626 STp->device->was_reset = 0;
3627 }
3628
3629 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3630 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3631 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3632 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3633
3634 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3635 do_door_lock(STp, 0); /* Ignore result! */
3636
3637 if (mtc.mt_op == MTSETDRVBUFFER &&
3638 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3639 retval = st_set_options(STp, mtc.mt_count);
3640 goto out;
3641 }
3642
3643 if (mtc.mt_op == MTSETPART) {
3644 if (!STp->can_partitions ||
3645 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3646 retval = (-EINVAL);
3647 goto out;
3648 }
3649 if (mtc.mt_count >= STp->nbr_partitions &&
3650 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3651 retval = (-EIO);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions) {
3655 retval = (-EINVAL);
3656 goto out;
3657 }
3658 STp->new_partition = mtc.mt_count;
3659 retval = 0;
3660 goto out;
3661 }
3662
3663 if (mtc.mt_op == MTMKPART) {
3664 if (!STp->can_partitions) {
3665 retval = (-EINVAL);
3666 goto out;
3667 }
3668 i = do_load_unload(STp, file, 1);
3669 if (i < 0) {
3670 retval = i;
3671 goto out;
3672 }
3673 i = partition_tape(STp, mtc.mt_count);
3674 if (i < 0) {
3675 retval = i;
3676 goto out;
3677 }
3678 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3679 STp->ps[i].rw = ST_IDLE;
3680 STp->ps[i].at_sm = 0;
3681 STp->ps[i].last_block_valid = 0;
3682 }
3683 STp->partition = STp->new_partition = 0;
3684 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3685 STps->drv_block = STps->drv_file = 0;
3686 retval = 0;
3687 goto out;
3688 }
3689
3690 if (mtc.mt_op == MTSEEK) {
3691 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3692 if (!STp->can_partitions)
3693 STp->ps[0].rw = ST_IDLE;
3694 retval = i;
3695 goto out;
3696 }
3697
3698 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3699 retval = do_load_unload(STp, file, 0);
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTLOAD) {
3704 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3709 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3710 goto out;
3711 }
3712
3713 if (STp->can_partitions && STp->ready == ST_READY &&
3714 (i = switch_partition(STp)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718
3719 if (mtc.mt_op == MTCOMPRESSION)
3720 retval = st_compression(STp, (mtc.mt_count & 1));
3721 else
3722 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3723 goto out;
3724 }
3725 if (!STm->defined) {
3726 retval = (-ENXIO);
3727 goto out;
3728 }
3729
3730 if ((i = flush_buffer(STp, 0)) < 0) {
3731 retval = i;
3732 goto out;
3733 }
3734 if (STp->can_partitions &&
3735 (i = switch_partition(STp)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739
3740 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3741 struct mtget mt_status;
3742
3743 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3744 retval = (-EINVAL);
3745 goto out;
3746 }
3747
3748 mt_status.mt_type = STp->tape_type;
3749 mt_status.mt_dsreg =
3750 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3751 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3752 mt_status.mt_blkno = STps->drv_block;
3753 mt_status.mt_fileno = STps->drv_file;
3754 if (STp->block_size != 0) {
3755 if (STps->rw == ST_WRITING)
3756 mt_status.mt_blkno +=
3757 (STp->buffer)->buffer_bytes / STp->block_size;
3758 else if (STps->rw == ST_READING)
3759 mt_status.mt_blkno -=
3760 ((STp->buffer)->buffer_bytes +
3761 STp->block_size - 1) / STp->block_size;
3762 }
3763
3764 mt_status.mt_gstat = 0;
3765 if (STp->drv_write_prot)
3766 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3767 if (mt_status.mt_blkno == 0) {
3768 if (mt_status.mt_fileno == 0)
3769 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3770 else
3771 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3772 }
3773 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3774 mt_status.mt_resid = STp->partition;
3775 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3776 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3777 else if (STps->eof >= ST_EOM_OK)
3778 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3779 if (STp->density == 1)
3780 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3781 else if (STp->density == 2)
3782 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3783 else if (STp->density == 3)
3784 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3785 if (STp->ready == ST_READY)
3786 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3787 if (STp->ready == ST_NO_TAPE)
3788 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3789 if (STps->at_sm)
3790 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3791 if (STm->do_async_writes ||
3792 (STm->do_buffer_writes && STp->block_size != 0) ||
3793 STp->drv_buffer != 0)
3794 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3795 if (STp->cleaning_req)
3796 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3797
3798 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3799 if (i) {
3800 retval = (-EFAULT);
3801 goto out;
3802 }
3803
3804 STp->recover_reg = 0; /* Clear after read */
3805 retval = 0;
3806 goto out;
3807 } /* End of MTIOCGET */
3808 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3809 struct mtpos mt_pos;
3810 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3811 retval = (-EINVAL);
3812 goto out;
3813 }
3814 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3815 retval = i;
3816 goto out;
3817 }
3818 mt_pos.mt_blkno = blk;
3819 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3820 if (i)
3821 retval = (-EFAULT);
3822 goto out;
3823 }
3824 mutex_unlock(&STp->lock);
3825 switch (cmd_in) {
3826 case SCSI_IOCTL_GET_IDLUN:
3827 case SCSI_IOCTL_GET_BUS_NUMBER:
3828 break;
3829 default:
3830 if ((cmd_in == SG_IO ||
3831 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3832 cmd_in == CDROM_SEND_PACKET) &&
3833 !capable(CAP_SYS_RAWIO))
3834 i = -EPERM;
3835 else
3836 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3837 file->f_mode, cmd_in, p);
3838 if (i != -ENOTTY)
3839 return i;
3840 break;
3841 }
3842 retval = scsi_ioctl(STp->device, cmd_in, p);
3843 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3844 STp->rew_at_close = 0;
3845 STp->ready = ST_NO_TAPE;
3846 }
3847 return retval;
3848
3849 out:
3850 mutex_unlock(&STp->lock);
3851 return retval;
3852}
3853
3854#ifdef CONFIG_COMPAT
3855static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3856{
3857 struct scsi_tape *STp = file->private_data;
3858 struct scsi_device *sdev = STp->device;
3859 int ret = -ENOIOCTLCMD;
3860 if (sdev->host->hostt->compat_ioctl) {
3861
3862 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3863
3864 }
3865 return ret;
3866}
3867#endif
3868
3869
3870
3871/* Try to allocate a new tape buffer. Calling function must not hold
3872 dev_arr_lock. */
3873static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3874{
3875 struct st_buffer *tb;
3876
3877 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3878 if (!tb) {
3879 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3880 return NULL;
3881 }
3882 tb->frp_segs = 0;
3883 tb->use_sg = max_sg;
3884 tb->dma = need_dma;
3885 tb->buffer_size = 0;
3886
3887 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3888 GFP_ATOMIC);
3889 if (!tb->reserved_pages) {
3890 kfree(tb);
3891 return NULL;
3892 }
3893
3894 return tb;
3895}
3896
3897
3898/* Try to allocate enough space in the tape buffer */
3899#define ST_MAX_ORDER 6
3900
3901static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3902{
3903 int segs, max_segs, b_size, order, got;
3904 gfp_t priority;
3905
3906 if (new_size <= STbuffer->buffer_size)
3907 return 1;
3908
3909 if (STbuffer->buffer_size <= PAGE_SIZE)
3910 normalize_buffer(STbuffer); /* Avoid extra segment */
3911
3912 max_segs = STbuffer->use_sg;
3913
3914 priority = GFP_KERNEL | __GFP_NOWARN;
3915 if (need_dma)
3916 priority |= GFP_DMA;
3917
3918 if (STbuffer->cleared)
3919 priority |= __GFP_ZERO;
3920
3921 if (STbuffer->frp_segs) {
3922 order = STbuffer->reserved_page_order;
3923 b_size = PAGE_SIZE << order;
3924 } else {
3925 for (b_size = PAGE_SIZE, order = 0;
3926 order < ST_MAX_ORDER &&
3927 max_segs * (PAGE_SIZE << order) < new_size;
3928 order++, b_size *= 2)
3929 ; /* empty */
3930 STbuffer->reserved_page_order = order;
3931 }
3932 if (max_segs * (PAGE_SIZE << order) < new_size) {
3933 if (order == ST_MAX_ORDER)
3934 return 0;
3935 normalize_buffer(STbuffer);
3936 return enlarge_buffer(STbuffer, new_size, need_dma);
3937 }
3938
3939 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3940 segs < max_segs && got < new_size;) {
3941 struct page *page;
3942
3943 page = alloc_pages(priority, order);
3944 if (!page) {
3945 DEB(STbuffer->buffer_size = got);
3946 normalize_buffer(STbuffer);
3947 return 0;
3948 }
3949
3950 STbuffer->frp_segs += 1;
3951 got += b_size;
3952 STbuffer->buffer_size = got;
3953 STbuffer->reserved_pages[segs] = page;
3954 segs++;
3955 }
3956 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3957
3958 return 1;
3959}
3960
3961
3962/* Make sure that no data from previous user is in the internal buffer */
3963static void clear_buffer(struct st_buffer * st_bp)
3964{
3965 int i;
3966
3967 for (i=0; i < st_bp->frp_segs; i++)
3968 memset(page_address(st_bp->reserved_pages[i]), 0,
3969 PAGE_SIZE << st_bp->reserved_page_order);
3970 st_bp->cleared = 1;
3971}
3972
3973
3974/* Release the extra buffer */
3975static void normalize_buffer(struct st_buffer * STbuffer)
3976{
3977 int i, order = STbuffer->reserved_page_order;
3978
3979 for (i = 0; i < STbuffer->frp_segs; i++) {
3980 __free_pages(STbuffer->reserved_pages[i], order);
3981 STbuffer->buffer_size -= (PAGE_SIZE << order);
3982 }
3983 STbuffer->frp_segs = 0;
3984 STbuffer->sg_segs = 0;
3985 STbuffer->reserved_page_order = 0;
3986 STbuffer->map_data.offset = 0;
3987}
3988
3989
3990/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3991 negative error code. */
3992static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3993{
3994 int i, cnt, res, offset;
3995 int length = PAGE_SIZE << st_bp->reserved_page_order;
3996
3997 for (i = 0, offset = st_bp->buffer_bytes;
3998 i < st_bp->frp_segs && offset >= length; i++)
3999 offset -= length;
4000 if (i == st_bp->frp_segs) { /* Should never happen */
4001 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4002 return (-EIO);
4003 }
4004 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4005 struct page *page = st_bp->reserved_pages[i];
4006 cnt = length - offset < do_count ? length - offset : do_count;
4007 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4008 if (res)
4009 return (-EFAULT);
4010 do_count -= cnt;
4011 st_bp->buffer_bytes += cnt;
4012 ubp += cnt;
4013 offset = 0;
4014 }
4015 if (do_count) /* Should never happen */
4016 return (-EIO);
4017
4018 return 0;
4019}
4020
4021
4022/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4023 negative error code. */
4024static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4025{
4026 int i, cnt, res, offset;
4027 int length = PAGE_SIZE << st_bp->reserved_page_order;
4028
4029 for (i = 0, offset = st_bp->read_pointer;
4030 i < st_bp->frp_segs && offset >= length; i++)
4031 offset -= length;
4032 if (i == st_bp->frp_segs) { /* Should never happen */
4033 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4034 return (-EIO);
4035 }
4036 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4037 struct page *page = st_bp->reserved_pages[i];
4038 cnt = length - offset < do_count ? length - offset : do_count;
4039 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4040 if (res)
4041 return (-EFAULT);
4042 do_count -= cnt;
4043 st_bp->buffer_bytes -= cnt;
4044 st_bp->read_pointer += cnt;
4045 ubp += cnt;
4046 offset = 0;
4047 }
4048 if (do_count) /* Should never happen */
4049 return (-EIO);
4050
4051 return 0;
4052}
4053
4054
4055/* Move data towards start of buffer */
4056static void move_buffer_data(struct st_buffer * st_bp, int offset)
4057{
4058 int src_seg, dst_seg, src_offset = 0, dst_offset;
4059 int count, total;
4060 int length = PAGE_SIZE << st_bp->reserved_page_order;
4061
4062 if (offset == 0)
4063 return;
4064
4065 total=st_bp->buffer_bytes - offset;
4066 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4067 src_offset = offset;
4068 if (src_offset < length)
4069 break;
4070 offset -= length;
4071 }
4072
4073 st_bp->buffer_bytes = st_bp->read_pointer = total;
4074 for (dst_seg=dst_offset=0; total > 0; ) {
4075 struct page *dpage = st_bp->reserved_pages[dst_seg];
4076 struct page *spage = st_bp->reserved_pages[src_seg];
4077
4078 count = min(length - dst_offset, length - src_offset);
4079 memmove(page_address(dpage) + dst_offset,
4080 page_address(spage) + src_offset, count);
4081 src_offset += count;
4082 if (src_offset >= length) {
4083 src_seg++;
4084 src_offset = 0;
4085 }
4086 dst_offset += count;
4087 if (dst_offset >= length) {
4088 dst_seg++;
4089 dst_offset = 0;
4090 }
4091 total -= count;
4092 }
4093}
4094
4095/* Validate the options from command line or module parameters */
4096static void validate_options(void)
4097{
4098 if (buffer_kbs > 0)
4099 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4100 if (max_sg_segs >= ST_FIRST_SG)
4101 st_max_sg_segs = max_sg_segs;
4102}
4103
4104#ifndef MODULE
4105/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4106 */
4107static int __init st_setup(char *str)
4108{
4109 int i, len, ints[5];
4110 char *stp;
4111
4112 stp = get_options(str, ARRAY_SIZE(ints), ints);
4113
4114 if (ints[0] > 0) {
4115 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4116 if (parms[i].val)
4117 *parms[i].val = ints[i + 1];
4118 } else {
4119 while (stp != NULL) {
4120 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4121 len = strlen(parms[i].name);
4122 if (!strncmp(stp, parms[i].name, len) &&
4123 (*(stp + len) == ':' || *(stp + len) == '=')) {
4124 if (parms[i].val)
4125 *parms[i].val =
4126 simple_strtoul(stp + len + 1, NULL, 0);
4127 else
4128 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4129 parms[i].name);
4130 break;
4131 }
4132 }
4133 if (i >= ARRAY_SIZE(parms))
4134 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4135 stp);
4136 stp = strchr(stp, ',');
4137 if (stp)
4138 stp++;
4139 }
4140 }
4141
4142 validate_options();
4143
4144 return 1;
4145}
4146
4147__setup("st=", st_setup);
4148
4149#endif
4150
4151static const struct file_operations st_fops =
4152{
4153 .owner = THIS_MODULE,
4154 .read = st_read,
4155 .write = st_write,
4156 .unlocked_ioctl = st_ioctl,
4157#ifdef CONFIG_COMPAT
4158 .compat_ioctl = st_compat_ioctl,
4159#endif
4160 .open = st_open,
4161 .flush = st_flush,
4162 .release = st_release,
4163 .llseek = noop_llseek,
4164};
4165
4166static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4167{
4168 int i, error;
4169 dev_t cdev_devno;
4170 struct cdev *cdev;
4171 struct device *dev;
4172 struct st_modedef *STm = &(tape->modes[mode]);
4173 char name[10];
4174 int dev_num = tape->index;
4175
4176 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4177
4178 cdev = cdev_alloc();
4179 if (!cdev) {
4180 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4181 error = -ENOMEM;
4182 goto out;
4183 }
4184 cdev->owner = THIS_MODULE;
4185 cdev->ops = &st_fops;
4186 STm->cdevs[rew] = cdev;
4187
4188 error = cdev_add(cdev, cdev_devno, 1);
4189 if (error) {
4190 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4191 rew ? "non" : "auto", mode);
4192 pr_err("st%d: Device not attached.\n", dev_num);
4193 goto out_free;
4194 }
4195
4196 i = mode << (4 - ST_NBR_MODE_BITS);
4197 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4198 tape->disk->disk_name, st_formats[i]);
4199
4200 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4201 cdev_devno, &tape->modes[mode], "%s", name);
4202 if (IS_ERR(dev)) {
4203 pr_err("st%d: device_create failed\n", dev_num);
4204 error = PTR_ERR(dev);
4205 goto out_free;
4206 }
4207
4208 STm->devs[rew] = dev;
4209
4210 return 0;
4211out_free:
4212 cdev_del(STm->cdevs[rew]);
4213out:
4214 STm->cdevs[rew] = NULL;
4215 STm->devs[rew] = NULL;
4216 return error;
4217}
4218
4219static int create_cdevs(struct scsi_tape *tape)
4220{
4221 int mode, error;
4222 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4223 error = create_one_cdev(tape, mode, 0);
4224 if (error)
4225 return error;
4226 error = create_one_cdev(tape, mode, 1);
4227 if (error)
4228 return error;
4229 }
4230
4231 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4232 &tape->modes[0].devs[0]->kobj, "tape");
4233}
4234
4235static void remove_cdevs(struct scsi_tape *tape)
4236{
4237 int mode, rew;
4238 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4239 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4240 struct st_modedef *STm = &(tape->modes[mode]);
4241 for (rew = 0; rew < 2; rew++) {
4242 if (STm->cdevs[rew])
4243 cdev_del(STm->cdevs[rew]);
4244 if (STm->devs[rew])
4245 device_unregister(STm->devs[rew]);
4246 }
4247 }
4248}
4249
4250static int st_probe(struct device *dev)
4251{
4252 struct scsi_device *SDp = to_scsi_device(dev);
4253 struct gendisk *disk = NULL;
4254 struct scsi_tape *tpnt = NULL;
4255 struct st_modedef *STm;
4256 struct st_partstat *STps;
4257 struct st_buffer *buffer;
4258 int i, error;
4259 char *stp;
4260
4261 if (SDp->type != TYPE_TAPE)
4262 return -ENODEV;
4263 if ((stp = st_incompatible(SDp))) {
4264 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4265 sdev_printk(KERN_INFO, SDp,
4266 "st: The suggested driver is %s.\n", stp);
4267 return -ENODEV;
4268 }
4269
4270 scsi_autopm_get_device(SDp);
4271 i = queue_max_segments(SDp->request_queue);
4272 if (st_max_sg_segs < i)
4273 i = st_max_sg_segs;
4274 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4275 if (buffer == NULL) {
4276 sdev_printk(KERN_ERR, SDp,
4277 "st: Can't allocate new tape buffer. "
4278 "Device not attached.\n");
4279 goto out;
4280 }
4281
4282 disk = alloc_disk(1);
4283 if (!disk) {
4284 sdev_printk(KERN_ERR, SDp,
4285 "st: out of memory. Device not attached.\n");
4286 goto out_buffer_free;
4287 }
4288
4289 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4290 if (tpnt == NULL) {
4291 sdev_printk(KERN_ERR, SDp,
4292 "st: Can't allocate device descriptor.\n");
4293 goto out_put_disk;
4294 }
4295 kref_init(&tpnt->kref);
4296 tpnt->disk = disk;
4297 disk->private_data = &tpnt->driver;
4298 disk->queue = SDp->request_queue;
4299 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4300 * take queue reference that release_disk() expects. */
4301 if (!blk_get_queue(disk->queue))
4302 goto out_put_disk;
4303 tpnt->driver = &st_template;
4304
4305 tpnt->device = SDp;
4306 if (SDp->scsi_level <= 2)
4307 tpnt->tape_type = MT_ISSCSI1;
4308 else
4309 tpnt->tape_type = MT_ISSCSI2;
4310
4311 tpnt->buffer = buffer;
4312 tpnt->buffer->last_SRpnt = NULL;
4313
4314 tpnt->inited = 0;
4315 tpnt->dirty = 0;
4316 tpnt->in_use = 0;
4317 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4318 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4319 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4320 tpnt->density = 0;
4321 tpnt->do_auto_lock = ST_AUTO_LOCK;
4322 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4323 tpnt->can_partitions = 0;
4324 tpnt->two_fm = ST_TWO_FM;
4325 tpnt->fast_mteom = ST_FAST_MTEOM;
4326 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4327 tpnt->sili = ST_SILI;
4328 tpnt->immediate = ST_NOWAIT;
4329 tpnt->immediate_filemark = 0;
4330 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4331 tpnt->partition = 0;
4332 tpnt->new_partition = 0;
4333 tpnt->nbr_partitions = 0;
4334 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4335 tpnt->long_timeout = ST_LONG_TIMEOUT;
4336 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4337
4338 for (i = 0; i < ST_NBR_MODES; i++) {
4339 STm = &(tpnt->modes[i]);
4340 STm->defined = 0;
4341 STm->sysv = ST_SYSV;
4342 STm->defaults_for_writes = 0;
4343 STm->do_async_writes = ST_ASYNC_WRITES;
4344 STm->do_buffer_writes = ST_BUFFER_WRITES;
4345 STm->do_read_ahead = ST_READ_AHEAD;
4346 STm->default_compression = ST_DONT_TOUCH;
4347 STm->default_blksize = (-1); /* No forced size */
4348 STm->default_density = (-1); /* No forced density */
4349 STm->tape = tpnt;
4350 }
4351
4352 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4353 STps = &(tpnt->ps[i]);
4354 STps->rw = ST_IDLE;
4355 STps->eof = ST_NOEOF;
4356 STps->at_sm = 0;
4357 STps->last_block_valid = 0;
4358 STps->drv_block = (-1);
4359 STps->drv_file = (-1);
4360 }
4361
4362 tpnt->current_mode = 0;
4363 tpnt->modes[0].defined = 1;
4364
4365 tpnt->density_changed = tpnt->compression_changed =
4366 tpnt->blksize_changed = 0;
4367 mutex_init(&tpnt->lock);
4368
4369 idr_preload(GFP_KERNEL);
4370 spin_lock(&st_index_lock);
4371 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4372 spin_unlock(&st_index_lock);
4373 idr_preload_end();
4374 if (error < 0) {
4375 pr_warn("st: idr allocation failed: %d\n", error);
4376 goto out_put_queue;
4377 }
4378 tpnt->index = error;
4379 sprintf(disk->disk_name, "st%d", tpnt->index);
4380 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4381 if (tpnt->stats == NULL) {
4382 sdev_printk(KERN_ERR, SDp,
4383 "st: Can't allocate statistics.\n");
4384 goto out_idr_remove;
4385 }
4386
4387 dev_set_drvdata(dev, tpnt);
4388
4389
4390 error = create_cdevs(tpnt);
4391 if (error)
4392 goto out_remove_devs;
4393 scsi_autopm_put_device(SDp);
4394
4395 sdev_printk(KERN_NOTICE, SDp,
4396 "Attached scsi tape %s\n", tape_name(tpnt));
4397 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4398 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4399 queue_dma_alignment(SDp->request_queue) + 1);
4400
4401 return 0;
4402
4403out_remove_devs:
4404 remove_cdevs(tpnt);
4405 kfree(tpnt->stats);
4406out_idr_remove:
4407 spin_lock(&st_index_lock);
4408 idr_remove(&st_index_idr, tpnt->index);
4409 spin_unlock(&st_index_lock);
4410out_put_queue:
4411 blk_put_queue(disk->queue);
4412out_put_disk:
4413 put_disk(disk);
4414 kfree(tpnt);
4415out_buffer_free:
4416 kfree(buffer);
4417out:
4418 scsi_autopm_put_device(SDp);
4419 return -ENODEV;
4420};
4421
4422
4423static int st_remove(struct device *dev)
4424{
4425 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4426 int index = tpnt->index;
4427
4428 scsi_autopm_get_device(to_scsi_device(dev));
4429 remove_cdevs(tpnt);
4430
4431 mutex_lock(&st_ref_mutex);
4432 kref_put(&tpnt->kref, scsi_tape_release);
4433 mutex_unlock(&st_ref_mutex);
4434 spin_lock(&st_index_lock);
4435 idr_remove(&st_index_idr, index);
4436 spin_unlock(&st_index_lock);
4437 return 0;
4438}
4439
4440/**
4441 * scsi_tape_release - Called to free the Scsi_Tape structure
4442 * @kref: pointer to embedded kref
4443 *
4444 * st_ref_mutex must be held entering this routine. Because it is
4445 * called on last put, you should always use the scsi_tape_get()
4446 * scsi_tape_put() helpers which manipulate the semaphore directly
4447 * and never do a direct kref_put().
4448 **/
4449static void scsi_tape_release(struct kref *kref)
4450{
4451 struct scsi_tape *tpnt = to_scsi_tape(kref);
4452 struct gendisk *disk = tpnt->disk;
4453
4454 tpnt->device = NULL;
4455
4456 if (tpnt->buffer) {
4457 normalize_buffer(tpnt->buffer);
4458 kfree(tpnt->buffer->reserved_pages);
4459 kfree(tpnt->buffer);
4460 }
4461
4462 disk->private_data = NULL;
4463 put_disk(disk);
4464 kfree(tpnt->stats);
4465 kfree(tpnt);
4466 return;
4467}
4468
4469static struct class st_sysfs_class = {
4470 .name = "scsi_tape",
4471 .dev_groups = st_dev_groups,
4472};
4473
4474static int __init init_st(void)
4475{
4476 int err;
4477
4478 validate_options();
4479
4480 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4481 verstr, st_fixed_buffer_size, st_max_sg_segs);
4482
4483 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4484 if (debugging) {
4485 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4486 debugging);
4487 }
4488
4489 err = class_register(&st_sysfs_class);
4490 if (err) {
4491 pr_err("Unable register sysfs class for SCSI tapes\n");
4492 return err;
4493 }
4494
4495 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4496 ST_MAX_TAPE_ENTRIES, "st");
4497 if (err) {
4498 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4499 SCSI_TAPE_MAJOR);
4500 goto err_class;
4501 }
4502
4503 err = scsi_register_driver(&st_template.gendrv);
4504 if (err)
4505 goto err_chrdev;
4506
4507 return 0;
4508
4509err_chrdev:
4510 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4511 ST_MAX_TAPE_ENTRIES);
4512err_class:
4513 class_unregister(&st_sysfs_class);
4514 return err;
4515}
4516
4517static void __exit exit_st(void)
4518{
4519 scsi_unregister_driver(&st_template.gendrv);
4520 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4521 ST_MAX_TAPE_ENTRIES);
4522 class_unregister(&st_sysfs_class);
4523 idr_destroy(&st_index_idr);
4524 printk(KERN_INFO "st: Unloaded.\n");
4525}
4526
4527module_init(init_st);
4528module_exit(exit_st);
4529
4530
4531/* The sysfs driver interface. Read-only at the moment */
4532static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4533{
4534 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4535}
4536static DRIVER_ATTR_RO(try_direct_io);
4537
4538static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4539{
4540 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4541}
4542static DRIVER_ATTR_RO(fixed_buffer_size);
4543
4544static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4545{
4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4547}
4548static DRIVER_ATTR_RO(max_sg_segs);
4549
4550static ssize_t version_show(struct device_driver *ddd, char *buf)
4551{
4552 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4553}
4554static DRIVER_ATTR_RO(version);
4555
4556#if DEBUG
4557static ssize_t debug_flag_store(struct device_driver *ddp,
4558 const char *buf, size_t count)
4559{
4560/* We only care what the first byte of the data is the rest is unused.
4561 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4562 * other values have -EINVAL returned if they are passed in.
4563 */
4564 if (count > 0) {
4565 if (buf[0] == '0') {
4566 debugging = NO_DEBUG;
4567 return count;
4568 } else if (buf[0] == '1') {
4569 debugging = 1;
4570 return count;
4571 }
4572 }
4573 return -EINVAL;
4574}
4575
4576static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4577{
4578 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4579}
4580static DRIVER_ATTR_RW(debug_flag);
4581#endif
4582
4583static struct attribute *st_drv_attrs[] = {
4584 &driver_attr_try_direct_io.attr,
4585 &driver_attr_fixed_buffer_size.attr,
4586 &driver_attr_max_sg_segs.attr,
4587 &driver_attr_version.attr,
4588#if DEBUG
4589 &driver_attr_debug_flag.attr,
4590#endif
4591 NULL,
4592};
4593ATTRIBUTE_GROUPS(st_drv);
4594
4595/* The sysfs simple class interface */
4596static ssize_t
4597defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4598{
4599 struct st_modedef *STm = dev_get_drvdata(dev);
4600 ssize_t l = 0;
4601
4602 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4603 return l;
4604}
4605static DEVICE_ATTR_RO(defined);
4606
4607static ssize_t
4608default_blksize_show(struct device *dev, struct device_attribute *attr,
4609 char *buf)
4610{
4611 struct st_modedef *STm = dev_get_drvdata(dev);
4612 ssize_t l = 0;
4613
4614 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4615 return l;
4616}
4617static DEVICE_ATTR_RO(default_blksize);
4618
4619static ssize_t
4620default_density_show(struct device *dev, struct device_attribute *attr,
4621 char *buf)
4622{
4623 struct st_modedef *STm = dev_get_drvdata(dev);
4624 ssize_t l = 0;
4625 char *fmt;
4626
4627 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4628 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4629 return l;
4630}
4631static DEVICE_ATTR_RO(default_density);
4632
4633static ssize_t
4634default_compression_show(struct device *dev, struct device_attribute *attr,
4635 char *buf)
4636{
4637 struct st_modedef *STm = dev_get_drvdata(dev);
4638 ssize_t l = 0;
4639
4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4641 return l;
4642}
4643static DEVICE_ATTR_RO(default_compression);
4644
4645static ssize_t
4646options_show(struct device *dev, struct device_attribute *attr, char *buf)
4647{
4648 struct st_modedef *STm = dev_get_drvdata(dev);
4649 struct scsi_tape *STp = STm->tape;
4650 int options;
4651 ssize_t l = 0;
4652
4653 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4654 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4655 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4656 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4657 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4658 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4659 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4660 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4661 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4662 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4663 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4664 options |= STm->sysv ? MT_ST_SYSV : 0;
4665 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4666 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4667 options |= STp->sili ? MT_ST_SILI : 0;
4668
4669 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4670 return l;
4671}
4672static DEVICE_ATTR_RO(options);
4673
4674/* Support for tape stats */
4675
4676/**
4677 * read_cnt_show - return read count - count of reads made from tape drive
4678 * @dev: struct device
4679 * @attr: attribute structure
4680 * @buf: buffer to return formatted data in
4681 */
4682static ssize_t read_cnt_show(struct device *dev,
4683 struct device_attribute *attr, char *buf)
4684{
4685 struct st_modedef *STm = dev_get_drvdata(dev);
4686
4687 return sprintf(buf, "%lld",
4688 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4689}
4690static DEVICE_ATTR_RO(read_cnt);
4691
4692/**
4693 * read_byte_cnt_show - return read byte count - tape drives
4694 * may use blocks less than 512 bytes this gives the raw byte count of
4695 * of data read from the tape drive.
4696 * @dev: struct device
4697 * @attr: attribute structure
4698 * @buf: buffer to return formatted data in
4699 */
4700static ssize_t read_byte_cnt_show(struct device *dev,
4701 struct device_attribute *attr, char *buf)
4702{
4703 struct st_modedef *STm = dev_get_drvdata(dev);
4704
4705 return sprintf(buf, "%lld",
4706 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4707}
4708static DEVICE_ATTR_RO(read_byte_cnt);
4709
4710/**
4711 * read_us_show - return read us - overall time spent waiting on reads in ns.
4712 * @dev: struct device
4713 * @attr: attribute structure
4714 * @buf: buffer to return formatted data in
4715 */
4716static ssize_t read_ns_show(struct device *dev,
4717 struct device_attribute *attr, char *buf)
4718{
4719 struct st_modedef *STm = dev_get_drvdata(dev);
4720
4721 return sprintf(buf, "%lld",
4722 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4723}
4724static DEVICE_ATTR_RO(read_ns);
4725
4726/**
4727 * write_cnt_show - write count - number of user calls
4728 * to write(2) that have written data to tape.
4729 * @dev: struct device
4730 * @attr: attribute structure
4731 * @buf: buffer to return formatted data in
4732 */
4733static ssize_t write_cnt_show(struct device *dev,
4734 struct device_attribute *attr, char *buf)
4735{
4736 struct st_modedef *STm = dev_get_drvdata(dev);
4737
4738 return sprintf(buf, "%lld",
4739 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4740}
4741static DEVICE_ATTR_RO(write_cnt);
4742
4743/**
4744 * write_byte_cnt_show - write byte count - raw count of
4745 * bytes written to tape.
4746 * @dev: struct device
4747 * @attr: attribute structure
4748 * @buf: buffer to return formatted data in
4749 */
4750static ssize_t write_byte_cnt_show(struct device *dev,
4751 struct device_attribute *attr, char *buf)
4752{
4753 struct st_modedef *STm = dev_get_drvdata(dev);
4754
4755 return sprintf(buf, "%lld",
4756 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4757}
4758static DEVICE_ATTR_RO(write_byte_cnt);
4759
4760/**
4761 * write_ns_show - write ns - number of nanoseconds waiting on write
4762 * requests to complete.
4763 * @dev: struct device
4764 * @attr: attribute structure
4765 * @buf: buffer to return formatted data in
4766 */
4767static ssize_t write_ns_show(struct device *dev,
4768 struct device_attribute *attr, char *buf)
4769{
4770 struct st_modedef *STm = dev_get_drvdata(dev);
4771
4772 return sprintf(buf, "%lld",
4773 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4774}
4775static DEVICE_ATTR_RO(write_ns);
4776
4777/**
4778 * in_flight_show - number of I/Os currently in flight -
4779 * in most cases this will be either 0 or 1. It may be higher if someone
4780 * has also issued other SCSI commands such as via an ioctl.
4781 * @dev: struct device
4782 * @attr: attribute structure
4783 * @buf: buffer to return formatted data in
4784 */
4785static ssize_t in_flight_show(struct device *dev,
4786 struct device_attribute *attr, char *buf)
4787{
4788 struct st_modedef *STm = dev_get_drvdata(dev);
4789
4790 return sprintf(buf, "%lld",
4791 (long long)atomic64_read(&STm->tape->stats->in_flight));
4792}
4793static DEVICE_ATTR_RO(in_flight);
4794
4795/**
4796 * io_ns_show - io wait ns - this is the number of ns spent
4797 * waiting on all I/O to complete. This includes tape movement commands
4798 * such as rewinding, seeking to end of file or tape, it also includes
4799 * read and write. To determine the time spent on tape movement
4800 * subtract the read and write ns from this value.
4801 * @dev: struct device
4802 * @attr: attribute structure
4803 * @buf: buffer to return formatted data in
4804 */
4805static ssize_t io_ns_show(struct device *dev,
4806 struct device_attribute *attr, char *buf)
4807{
4808 struct st_modedef *STm = dev_get_drvdata(dev);
4809
4810 return sprintf(buf, "%lld",
4811 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4812}
4813static DEVICE_ATTR_RO(io_ns);
4814
4815/**
4816 * other_cnt_show - other io count - this is the number of
4817 * I/O requests other than read and write requests.
4818 * Typically these are tape movement requests but will include driver
4819 * tape movement. This includes only requests issued by the st driver.
4820 * @dev: struct device
4821 * @attr: attribute structure
4822 * @buf: buffer to return formatted data in
4823 */
4824static ssize_t other_cnt_show(struct device *dev,
4825 struct device_attribute *attr, char *buf)
4826{
4827 struct st_modedef *STm = dev_get_drvdata(dev);
4828
4829 return sprintf(buf, "%lld",
4830 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4831}
4832static DEVICE_ATTR_RO(other_cnt);
4833
4834/**
4835 * resid_cnt_show - A count of the number of times we get a residual
4836 * count - this should indicate someone issuing reads larger than the
4837 * block size on tape.
4838 * @dev: struct device
4839 * @attr: attribute structure
4840 * @buf: buffer to return formatted data in
4841 */
4842static ssize_t resid_cnt_show(struct device *dev,
4843 struct device_attribute *attr, char *buf)
4844{
4845 struct st_modedef *STm = dev_get_drvdata(dev);
4846
4847 return sprintf(buf, "%lld",
4848 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4849}
4850static DEVICE_ATTR_RO(resid_cnt);
4851
4852static struct attribute *st_dev_attrs[] = {
4853 &dev_attr_defined.attr,
4854 &dev_attr_default_blksize.attr,
4855 &dev_attr_default_density.attr,
4856 &dev_attr_default_compression.attr,
4857 &dev_attr_options.attr,
4858 NULL,
4859};
4860
4861static struct attribute *st_stats_attrs[] = {
4862 &dev_attr_read_cnt.attr,
4863 &dev_attr_read_byte_cnt.attr,
4864 &dev_attr_read_ns.attr,
4865 &dev_attr_write_cnt.attr,
4866 &dev_attr_write_byte_cnt.attr,
4867 &dev_attr_write_ns.attr,
4868 &dev_attr_in_flight.attr,
4869 &dev_attr_io_ns.attr,
4870 &dev_attr_other_cnt.attr,
4871 &dev_attr_resid_cnt.attr,
4872 NULL,
4873};
4874
4875static struct attribute_group stats_group = {
4876 .name = "stats",
4877 .attrs = st_stats_attrs,
4878};
4879
4880static struct attribute_group st_group = {
4881 .attrs = st_dev_attrs,
4882};
4883
4884static const struct attribute_group *st_dev_groups[] = {
4885 &st_group,
4886 &stats_group,
4887 NULL,
4888};
4889
4890/* The following functions may be useful for a larger audience. */
4891static int sgl_map_user_pages(struct st_buffer *STbp,
4892 const unsigned int max_pages, unsigned long uaddr,
4893 size_t count, int rw)
4894{
4895 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4896 unsigned long start = uaddr >> PAGE_SHIFT;
4897 const int nr_pages = end - start;
4898 int res, i, j;
4899 struct page **pages;
4900 struct rq_map_data *mdata = &STbp->map_data;
4901
4902 /* User attempted Overflow! */
4903 if ((uaddr + count) < uaddr)
4904 return -EINVAL;
4905
4906 /* Too big */
4907 if (nr_pages > max_pages)
4908 return -ENOMEM;
4909
4910 /* Hmm? */
4911 if (count == 0)
4912 return 0;
4913
4914 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4915 return -ENOMEM;
4916
4917 /* Try to fault in all of the necessary pages */
4918 /* rw==READ means read from drive, write into memory area */
4919 res = get_user_pages_unlocked(
4920 uaddr,
4921 nr_pages,
4922 rw == READ,
4923 0, /* don't force */
4924 pages);
4925
4926 /* Errors and no page mapped should return here */
4927 if (res < nr_pages)
4928 goto out_unmap;
4929
4930 for (i=0; i < nr_pages; i++) {
4931 /* FIXME: flush superflous for rw==READ,
4932 * probably wrong function for rw==WRITE
4933 */
4934 flush_dcache_page(pages[i]);
4935 }
4936
4937 mdata->offset = uaddr & ~PAGE_MASK;
4938 STbp->mapped_pages = pages;
4939
4940 return nr_pages;
4941 out_unmap:
4942 if (res > 0) {
4943 for (j=0; j < res; j++)
4944 put_page(pages[j]);
4945 res = 0;
4946 }
4947 kfree(pages);
4948 return res;
4949}
4950
4951
4952/* And unmap them... */
4953static int sgl_unmap_user_pages(struct st_buffer *STbp,
4954 const unsigned int nr_pages, int dirtied)
4955{
4956 int i;
4957
4958 for (i=0; i < nr_pages; i++) {
4959 struct page *page = STbp->mapped_pages[i];
4960
4961 if (dirtied)
4962 SetPageDirty(page);
4963 /* FIXME: cache flush missing for rw==READ
4964 * FIXME: call the correct reference counting function
4965 */
4966 put_page(page);
4967 }
4968 kfree(STbp->mapped_pages);
4969 STbp->mapped_pages = NULL;
4970
4971 return 0;
4972}