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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/major.h>
36#include <linux/cdrom.h>
37#include <linux/ioctl.h>
38#include <linux/fcntl.h>
39#include <linux/spinlock.h>
40#include <linux/blkdev.h>
41#include <linux/moduleparam.h>
42#include <linux/cdev.h>
43#include <linux/idr.h>
44#include <linux/delay.h>
45#include <linux/mutex.h>
46
47#include <linux/uaccess.h>
48#include <asm/dma.h>
49#include <asm/unaligned.h>
50
51#include <scsi/scsi.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_driver.h>
55#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h>
58#include <scsi/sg.h>
59
60
61/* The driver prints some debugging information on the console if DEBUG
62 is defined and non-zero. */
63#define DEBUG 1
64#define NO_DEBUG 0
65
66#define ST_DEB_MSG KERN_NOTICE
67#if DEBUG
68/* The message level for the debug messages is currently set to KERN_NOTICE
69 so that people can easily see the messages. Later when the debugging messages
70 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
71#define DEB(a) a
72#define DEBC(a) if (debugging) { a ; }
73#else
74#define DEB(a)
75#define DEBC(a)
76#endif
77
78#define ST_KILOBYTE 1024
79
80#include "st_options.h"
81#include "st.h"
82
83static int buffer_kbs;
84static int max_sg_segs;
85static int try_direct_io = TRY_DIRECT_IO;
86static int try_rdio = 1;
87static int try_wdio = 1;
88static int debug_flag;
89
90static struct class st_sysfs_class;
91static const struct attribute_group *st_dev_groups[];
92static const struct attribute_group *st_drv_groups[];
93
94MODULE_AUTHOR("Kai Makisara");
95MODULE_DESCRIPTION("SCSI tape (st) driver");
96MODULE_LICENSE("GPL");
97MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
98MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
99
100/* Set 'perm' (4th argument) to 0 to disable module_param's definition
101 * of sysfs parameters (which module_param doesn't yet support).
102 * Sysfs parameters defined explicitly later.
103 */
104module_param_named(buffer_kbs, buffer_kbs, int, 0);
105MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
106module_param_named(max_sg_segs, max_sg_segs, int, 0);
107MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
108module_param_named(try_direct_io, try_direct_io, int, 0);
109MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
110module_param_named(debug_flag, debug_flag, int, 0);
111MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
112
113
114/* Extra parameters for testing */
115module_param_named(try_rdio, try_rdio, int, 0);
116MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
117module_param_named(try_wdio, try_wdio, int, 0);
118MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
119
120#ifndef MODULE
121static int write_threshold_kbs; /* retained for compatibility */
122static struct st_dev_parm {
123 char *name;
124 int *val;
125} parms[] __initdata = {
126 {
127 "buffer_kbs", &buffer_kbs
128 },
129 { /* Retained for compatibility with 2.4 */
130 "write_threshold_kbs", &write_threshold_kbs
131 },
132 {
133 "max_sg_segs", NULL
134 },
135 {
136 "try_direct_io", &try_direct_io
137 },
138 {
139 "debug_flag", &debug_flag
140 }
141};
142#endif
143
144/* Restrict the number of modes so that names for all are assigned */
145#if ST_NBR_MODES > 16
146#error "Maximum number of modes is 16"
147#endif
148/* Bit reversed order to get same names for same minors with all
149 mode counts */
150static const char *st_formats[] = {
151 "", "r", "k", "s", "l", "t", "o", "u",
152 "m", "v", "p", "x", "a", "y", "q", "z"};
153
154/* The default definitions have been moved to st_options.h */
155
156#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
157
158/* The buffer size should fit into the 24 bits for length in the
159 6-byte SCSI read and write commands. */
160#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
161#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
162#endif
163
164static int debugging = DEBUG;
165
166#define MAX_RETRIES 0
167#define MAX_WRITE_RETRIES 0
168#define MAX_READY_RETRIES 0
169#define NO_TAPE NOT_READY
170
171#define ST_TIMEOUT (900 * HZ)
172#define ST_LONG_TIMEOUT (14000 * HZ)
173
174/* Remove mode bits and auto-rewind bit (7) */
175#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
176 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
177#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
178
179/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
180#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
181 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
182
183/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
184 24 bits) */
185#define SET_DENS_AND_BLK 0x10001
186
187static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
188static int st_max_sg_segs = ST_MAX_SG;
189
190static int modes_defined;
191
192static int enlarge_buffer(struct st_buffer *, int);
193static void clear_buffer(struct st_buffer *);
194static void normalize_buffer(struct st_buffer *);
195static int append_to_buffer(const char __user *, struct st_buffer *, int);
196static int from_buffer(struct st_buffer *, char __user *, int);
197static void move_buffer_data(struct st_buffer *, int);
198
199static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
200 unsigned long, size_t, int);
201static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
202
203static int st_probe(struct device *);
204static int st_remove(struct device *);
205
206static struct scsi_driver st_template = {
207 .gendrv = {
208 .name = "st",
209 .owner = THIS_MODULE,
210 .probe = st_probe,
211 .remove = st_remove,
212 .groups = st_drv_groups,
213 },
214};
215
216static int st_compression(struct scsi_tape *, int);
217
218static int find_partition(struct scsi_tape *);
219static int switch_partition(struct scsi_tape *);
220
221static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
222
223static void scsi_tape_release(struct kref *);
224
225#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
226
227static DEFINE_MUTEX(st_ref_mutex);
228static DEFINE_SPINLOCK(st_index_lock);
229static DEFINE_SPINLOCK(st_use_lock);
230static DEFINE_IDR(st_index_idr);
231
232
233
234#ifndef SIGS_FROM_OSST
235#define SIGS_FROM_OSST \
236 {"OnStream", "SC-", "", "osst"}, \
237 {"OnStream", "DI-", "", "osst"}, \
238 {"OnStream", "DP-", "", "osst"}, \
239 {"OnStream", "USB", "", "osst"}, \
240 {"OnStream", "FW-", "", "osst"}
241#endif
242
243static struct scsi_tape *scsi_tape_get(int dev)
244{
245 struct scsi_tape *STp = NULL;
246
247 mutex_lock(&st_ref_mutex);
248 spin_lock(&st_index_lock);
249
250 STp = idr_find(&st_index_idr, dev);
251 if (!STp) goto out;
252
253 kref_get(&STp->kref);
254
255 if (!STp->device)
256 goto out_put;
257
258 if (scsi_device_get(STp->device))
259 goto out_put;
260
261 goto out;
262
263out_put:
264 kref_put(&STp->kref, scsi_tape_release);
265 STp = NULL;
266out:
267 spin_unlock(&st_index_lock);
268 mutex_unlock(&st_ref_mutex);
269 return STp;
270}
271
272static void scsi_tape_put(struct scsi_tape *STp)
273{
274 struct scsi_device *sdev = STp->device;
275
276 mutex_lock(&st_ref_mutex);
277 kref_put(&STp->kref, scsi_tape_release);
278 scsi_device_put(sdev);
279 mutex_unlock(&st_ref_mutex);
280}
281
282struct st_reject_data {
283 char *vendor;
284 char *model;
285 char *rev;
286 char *driver_hint; /* Name of the correct driver, NULL if unknown */
287};
288
289static struct st_reject_data reject_list[] = {
290 /* {"XXX", "Yy-", "", NULL}, example */
291 SIGS_FROM_OSST,
292 {NULL, }};
293
294/* If the device signature is on the list of incompatible drives, the
295 function returns a pointer to the name of the correct driver (if known) */
296static char * st_incompatible(struct scsi_device* SDp)
297{
298 struct st_reject_data *rp;
299
300 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
301 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
302 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
303 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
304 if (rp->driver_hint)
305 return rp->driver_hint;
306 else
307 return "unknown";
308 }
309 return NULL;
310}
311
312
313#define st_printk(prefix, t, fmt, a...) \
314 sdev_prefix_printk(prefix, (t)->device, (t)->name, fmt, ##a)
315#ifdef DEBUG
316#define DEBC_printk(t, fmt, a...) \
317 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
318#else
319#define DEBC_printk(t, fmt, a...)
320#endif
321
322static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
323{
324 const u8 *ucp;
325 const u8 *sense = SRpnt->sense;
326
327 s->have_sense = scsi_normalize_sense(SRpnt->sense,
328 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
329 s->flags = 0;
330
331 if (s->have_sense) {
332 s->deferred = 0;
333 s->remainder_valid =
334 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
335 switch (sense[0] & 0x7f) {
336 case 0x71:
337 s->deferred = 1;
338 fallthrough;
339 case 0x70:
340 s->fixed_format = 1;
341 s->flags = sense[2] & 0xe0;
342 break;
343 case 0x73:
344 s->deferred = 1;
345 fallthrough;
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 = STp->name;
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 0, host bt 0x%x).\n",
390 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 if (cmdstatp->have_sense && scode == UNIT_ATTENTION && cmdstatp->sense_hdr.asc == 0x29)
418 STp->pos_unknown = 1; /* ASC => power on / reset */
419
420 STp->pos_unknown |= STp->device->was_reset;
421
422 if (cmdstatp->have_sense &&
423 scode == RECOVERED_ERROR
424#if ST_RECOVERED_WRITE_FATAL
425 && SRpnt->cmd[0] != WRITE_6
426 && SRpnt->cmd[0] != WRITE_FILEMARKS
427#endif
428 ) {
429 STp->recover_count++;
430 STp->recover_reg++;
431
432 DEB(
433 if (debugging) {
434 if (SRpnt->cmd[0] == READ_6)
435 stp = "read";
436 else if (SRpnt->cmd[0] == WRITE_6)
437 stp = "write";
438 else
439 stp = "ioctl";
440 st_printk(ST_DEB_MSG, STp,
441 "Recovered %s error (%d).\n",
442 stp, STp->recover_count);
443 } ) /* end DEB */
444
445 if (cmdstatp->flags == 0)
446 return 0;
447 }
448 return (-EIO);
449}
450
451static struct st_request *st_allocate_request(struct scsi_tape *stp)
452{
453 struct st_request *streq;
454
455 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
456 if (streq)
457 streq->stp = stp;
458 else {
459 st_printk(KERN_ERR, stp,
460 "Can't get SCSI request.\n");
461 if (signal_pending(current))
462 stp->buffer->syscall_result = -EINTR;
463 else
464 stp->buffer->syscall_result = -EBUSY;
465 }
466
467 return streq;
468}
469
470static void st_release_request(struct st_request *streq)
471{
472 kfree(streq);
473}
474
475static void st_do_stats(struct scsi_tape *STp, struct request *req)
476{
477 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
478 ktime_t now;
479
480 now = ktime_get();
481 if (scmd->cmnd[0] == WRITE_6) {
482 now = ktime_sub(now, STp->stats->write_time);
483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
485 atomic64_inc(&STp->stats->write_cnt);
486 if (scmd->result) {
487 atomic64_add(atomic_read(&STp->stats->last_write_size)
488 - STp->buffer->cmdstat.residual,
489 &STp->stats->write_byte_cnt);
490 if (STp->buffer->cmdstat.residual > 0)
491 atomic64_inc(&STp->stats->resid_cnt);
492 } else
493 atomic64_add(atomic_read(&STp->stats->last_write_size),
494 &STp->stats->write_byte_cnt);
495 } else if (scmd->cmnd[0] == READ_6) {
496 now = ktime_sub(now, STp->stats->read_time);
497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
499 atomic64_inc(&STp->stats->read_cnt);
500 if (scmd->result) {
501 atomic64_add(atomic_read(&STp->stats->last_read_size)
502 - STp->buffer->cmdstat.residual,
503 &STp->stats->read_byte_cnt);
504 if (STp->buffer->cmdstat.residual > 0)
505 atomic64_inc(&STp->stats->resid_cnt);
506 } else
507 atomic64_add(atomic_read(&STp->stats->last_read_size),
508 &STp->stats->read_byte_cnt);
509 } else {
510 now = ktime_sub(now, STp->stats->other_time);
511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
512 atomic64_inc(&STp->stats->other_cnt);
513 }
514 atomic64_dec(&STp->stats->in_flight);
515}
516
517static enum rq_end_io_ret st_scsi_execute_end(struct request *req,
518 blk_status_t status)
519{
520 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
521 struct st_request *SRpnt = req->end_io_data;
522 struct scsi_tape *STp = SRpnt->stp;
523 struct bio *tmp;
524
525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = scmd->result;
526 STp->buffer->cmdstat.residual = scmd->resid_len;
527
528 st_do_stats(STp, req);
529
530 tmp = SRpnt->bio;
531 if (scmd->sense_len)
532 memcpy(SRpnt->sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
533 if (SRpnt->waiting)
534 complete(SRpnt->waiting);
535
536 blk_rq_unmap_user(tmp);
537 blk_mq_free_request(req);
538 return RQ_END_IO_NONE;
539}
540
541static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
542 int data_direction, void *buffer, unsigned bufflen,
543 int timeout, int retries)
544{
545 struct request *req;
546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
547 int err = 0;
548 struct scsi_tape *STp = SRpnt->stp;
549 struct scsi_cmnd *scmd;
550
551 req = scsi_alloc_request(SRpnt->stp->device->request_queue,
552 data_direction == DMA_TO_DEVICE ?
553 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
554 if (IS_ERR(req))
555 return PTR_ERR(req);
556 scmd = blk_mq_rq_to_pdu(req);
557 req->rq_flags |= RQF_QUIET;
558
559 mdata->null_mapped = 1;
560
561 if (bufflen) {
562 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
563 GFP_KERNEL);
564 if (err) {
565 blk_mq_free_request(req);
566 return err;
567 }
568 }
569
570 atomic64_inc(&STp->stats->in_flight);
571 if (cmd[0] == WRITE_6) {
572 atomic_set(&STp->stats->last_write_size, bufflen);
573 STp->stats->write_time = ktime_get();
574 } else if (cmd[0] == READ_6) {
575 atomic_set(&STp->stats->last_read_size, bufflen);
576 STp->stats->read_time = ktime_get();
577 } else {
578 STp->stats->other_time = ktime_get();
579 }
580
581 SRpnt->bio = req->bio;
582 scmd->cmd_len = COMMAND_SIZE(cmd[0]);
583 memcpy(scmd->cmnd, cmd, scmd->cmd_len);
584 req->timeout = timeout;
585 scmd->allowed = retries;
586 req->end_io = st_scsi_execute_end;
587 req->end_io_data = SRpnt;
588
589 blk_execute_rq_nowait(req, true);
590 return 0;
591}
592
593/* Do the scsi command. Waits until command performed if do_wait is true.
594 Otherwise write_behind_check() is used to check that the command
595 has finished. */
596static struct st_request *
597st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
598 int bytes, int direction, int timeout, int retries, int do_wait)
599{
600 struct completion *waiting;
601 struct rq_map_data *mdata = &STp->buffer->map_data;
602 int ret;
603
604 /* if async, make sure there's no command outstanding */
605 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
606 st_printk(KERN_ERR, STp,
607 "Async command already active.\n");
608 if (signal_pending(current))
609 (STp->buffer)->syscall_result = (-EINTR);
610 else
611 (STp->buffer)->syscall_result = (-EBUSY);
612 return NULL;
613 }
614
615 if (!SRpnt) {
616 SRpnt = st_allocate_request(STp);
617 if (!SRpnt)
618 return NULL;
619 }
620
621 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
622 which IO is outstanding. It's nulled out when the IO completes. */
623 if (!do_wait)
624 (STp->buffer)->last_SRpnt = SRpnt;
625
626 waiting = &STp->wait;
627 init_completion(waiting);
628 SRpnt->waiting = waiting;
629
630 if (STp->buffer->do_dio) {
631 mdata->page_order = 0;
632 mdata->nr_entries = STp->buffer->sg_segs;
633 mdata->pages = STp->buffer->mapped_pages;
634 } else {
635 mdata->page_order = STp->buffer->reserved_page_order;
636 mdata->nr_entries =
637 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
638 mdata->pages = STp->buffer->reserved_pages;
639 mdata->offset = 0;
640 }
641
642 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
643 STp->buffer->cmdstat.have_sense = 0;
644 STp->buffer->syscall_result = 0;
645
646 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
647 retries);
648 if (ret) {
649 /* could not allocate the buffer or request was too large */
650 (STp->buffer)->syscall_result = (-EBUSY);
651 (STp->buffer)->last_SRpnt = NULL;
652 } else if (do_wait) {
653 wait_for_completion(waiting);
654 SRpnt->waiting = NULL;
655 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
656 }
657
658 return SRpnt;
659}
660
661
662/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
663 write has been correct but EOM early warning reached, -EIO if write ended in
664 error or zero if write successful. Asynchronous writes are used only in
665 variable block mode. */
666static int write_behind_check(struct scsi_tape * STp)
667{
668 int retval = 0;
669 struct st_buffer *STbuffer;
670 struct st_partstat *STps;
671 struct st_cmdstatus *cmdstatp;
672 struct st_request *SRpnt;
673
674 STbuffer = STp->buffer;
675 if (!STbuffer->writing)
676 return 0;
677
678 DEB(
679 if (STp->write_pending)
680 STp->nbr_waits++;
681 else
682 STp->nbr_finished++;
683 ) /* end DEB */
684
685 wait_for_completion(&(STp->wait));
686 SRpnt = STbuffer->last_SRpnt;
687 STbuffer->last_SRpnt = NULL;
688 SRpnt->waiting = NULL;
689
690 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
691 st_release_request(SRpnt);
692
693 STbuffer->buffer_bytes -= STbuffer->writing;
694 STps = &(STp->ps[STp->partition]);
695 if (STps->drv_block >= 0) {
696 if (STp->block_size == 0)
697 STps->drv_block++;
698 else
699 STps->drv_block += STbuffer->writing / STp->block_size;
700 }
701
702 cmdstatp = &STbuffer->cmdstat;
703 if (STbuffer->syscall_result) {
704 retval = -EIO;
705 if (cmdstatp->have_sense && !cmdstatp->deferred &&
706 (cmdstatp->flags & SENSE_EOM) &&
707 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
708 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
709 /* EOM at write-behind, has all data been written? */
710 if (!cmdstatp->remainder_valid ||
711 cmdstatp->uremainder64 == 0)
712 retval = -ENOSPC;
713 }
714 if (retval == -EIO)
715 STps->drv_block = -1;
716 }
717 STbuffer->writing = 0;
718
719 DEB(if (debugging && retval)
720 st_printk(ST_DEB_MSG, STp,
721 "Async write error %x, return value %d.\n",
722 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
723
724 return retval;
725}
726
727
728/* Step over EOF if it has been inadvertently crossed (ioctl not used because
729 it messes up the block number). */
730static int cross_eof(struct scsi_tape * STp, int forward)
731{
732 struct st_request *SRpnt;
733 unsigned char cmd[MAX_COMMAND_SIZE];
734
735 cmd[0] = SPACE;
736 cmd[1] = 0x01; /* Space FileMarks */
737 if (forward) {
738 cmd[2] = cmd[3] = 0;
739 cmd[4] = 1;
740 } else
741 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
742 cmd[5] = 0;
743
744 DEBC_printk(STp, "Stepping over filemark %s.\n",
745 forward ? "forward" : "backward");
746
747 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
748 STp->device->request_queue->rq_timeout,
749 MAX_RETRIES, 1);
750 if (!SRpnt)
751 return (STp->buffer)->syscall_result;
752
753 st_release_request(SRpnt);
754 SRpnt = NULL;
755
756 if ((STp->buffer)->cmdstat.midlevel_result != 0)
757 st_printk(KERN_ERR, STp,
758 "Stepping over filemark %s failed.\n",
759 forward ? "forward" : "backward");
760
761 return (STp->buffer)->syscall_result;
762}
763
764
765/* Flush the write buffer (never need to write if variable blocksize). */
766static int st_flush_write_buffer(struct scsi_tape * STp)
767{
768 int transfer, blks;
769 int result;
770 unsigned char cmd[MAX_COMMAND_SIZE];
771 struct st_request *SRpnt;
772 struct st_partstat *STps;
773
774 result = write_behind_check(STp);
775 if (result)
776 return result;
777
778 result = 0;
779 if (STp->dirty == 1) {
780
781 transfer = STp->buffer->buffer_bytes;
782 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
783
784 memset(cmd, 0, MAX_COMMAND_SIZE);
785 cmd[0] = WRITE_6;
786 cmd[1] = 1;
787 blks = transfer / STp->block_size;
788 cmd[2] = blks >> 16;
789 cmd[3] = blks >> 8;
790 cmd[4] = blks;
791
792 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
793 STp->device->request_queue->rq_timeout,
794 MAX_WRITE_RETRIES, 1);
795 if (!SRpnt)
796 return (STp->buffer)->syscall_result;
797
798 STps = &(STp->ps[STp->partition]);
799 if ((STp->buffer)->syscall_result != 0) {
800 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
801
802 if (cmdstatp->have_sense && !cmdstatp->deferred &&
803 (cmdstatp->flags & SENSE_EOM) &&
804 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
805 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
806 (!cmdstatp->remainder_valid ||
807 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
808 STp->dirty = 0;
809 (STp->buffer)->buffer_bytes = 0;
810 if (STps->drv_block >= 0)
811 STps->drv_block += blks;
812 result = (-ENOSPC);
813 } else {
814 st_printk(KERN_ERR, STp, "Error on flush.\n");
815 STps->drv_block = (-1);
816 result = (-EIO);
817 }
818 } else {
819 if (STps->drv_block >= 0)
820 STps->drv_block += blks;
821 STp->dirty = 0;
822 (STp->buffer)->buffer_bytes = 0;
823 }
824 st_release_request(SRpnt);
825 SRpnt = NULL;
826 }
827 return result;
828}
829
830
831/* Flush the tape buffer. The tape will be positioned correctly unless
832 seek_next is true. */
833static int flush_buffer(struct scsi_tape *STp, int seek_next)
834{
835 int backspace, result;
836 struct st_partstat *STps;
837
838 /*
839 * If there was a bus reset, block further access
840 * to this device.
841 */
842 if (STp->pos_unknown)
843 return (-EIO);
844
845 if (STp->ready != ST_READY)
846 return 0;
847 STps = &(STp->ps[STp->partition]);
848 if (STps->rw == ST_WRITING) /* Writing */
849 return st_flush_write_buffer(STp);
850
851 if (STp->block_size == 0)
852 return 0;
853
854 backspace = ((STp->buffer)->buffer_bytes +
855 (STp->buffer)->read_pointer) / STp->block_size -
856 ((STp->buffer)->read_pointer + STp->block_size - 1) /
857 STp->block_size;
858 (STp->buffer)->buffer_bytes = 0;
859 (STp->buffer)->read_pointer = 0;
860 result = 0;
861 if (!seek_next) {
862 if (STps->eof == ST_FM_HIT) {
863 result = cross_eof(STp, 0); /* Back over the EOF hit */
864 if (!result)
865 STps->eof = ST_NOEOF;
866 else {
867 if (STps->drv_file >= 0)
868 STps->drv_file++;
869 STps->drv_block = 0;
870 }
871 }
872 if (!result && backspace > 0)
873 result = st_int_ioctl(STp, MTBSR, backspace);
874 } else if (STps->eof == ST_FM_HIT) {
875 if (STps->drv_file >= 0)
876 STps->drv_file++;
877 STps->drv_block = 0;
878 STps->eof = ST_NOEOF;
879 }
880 return result;
881
882}
883
884/* Set the mode parameters */
885static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
886{
887 int set_it = 0;
888 unsigned long arg;
889
890 if (!STp->density_changed &&
891 STm->default_density >= 0 &&
892 STm->default_density != STp->density) {
893 arg = STm->default_density;
894 set_it = 1;
895 } else
896 arg = STp->density;
897 arg <<= MT_ST_DENSITY_SHIFT;
898 if (!STp->blksize_changed &&
899 STm->default_blksize >= 0 &&
900 STm->default_blksize != STp->block_size) {
901 arg |= STm->default_blksize;
902 set_it = 1;
903 } else
904 arg |= STp->block_size;
905 if (set_it &&
906 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
907 st_printk(KERN_WARNING, STp,
908 "Can't set default block size to %d bytes "
909 "and density %x.\n",
910 STm->default_blksize, STm->default_density);
911 if (modes_defined)
912 return (-EINVAL);
913 }
914 return 0;
915}
916
917
918/* Lock or unlock the drive door. Don't use when st_request allocated. */
919static int do_door_lock(struct scsi_tape * STp, int do_lock)
920{
921 int retval;
922
923 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
924
925 retval = scsi_set_medium_removal(STp->device,
926 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
927 if (!retval)
928 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
929 else
930 STp->door_locked = ST_LOCK_FAILS;
931 return retval;
932}
933
934
935/* Set the internal state after reset */
936static void reset_state(struct scsi_tape *STp)
937{
938 int i;
939 struct st_partstat *STps;
940
941 STp->pos_unknown = 0;
942 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
943 STps = &(STp->ps[i]);
944 STps->rw = ST_IDLE;
945 STps->eof = ST_NOEOF;
946 STps->at_sm = 0;
947 STps->last_block_valid = 0;
948 STps->drv_block = -1;
949 STps->drv_file = -1;
950 }
951 if (STp->can_partitions) {
952 STp->partition = find_partition(STp);
953 if (STp->partition < 0)
954 STp->partition = 0;
955 STp->new_partition = STp->partition;
956 }
957}
958
959/* Test if the drive is ready. Returns either one of the codes below or a negative system
960 error code. */
961#define CHKRES_READY 0
962#define CHKRES_NEW_SESSION 1
963#define CHKRES_NOT_READY 2
964#define CHKRES_NO_TAPE 3
965
966#define MAX_ATTENTIONS 10
967
968static int test_ready(struct scsi_tape *STp, int do_wait)
969{
970 int attentions, waits, max_wait, scode;
971 int retval = CHKRES_READY, new_session = 0;
972 unsigned char cmd[MAX_COMMAND_SIZE];
973 struct st_request *SRpnt = NULL;
974 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
975
976 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
977
978 for (attentions=waits=0; ; ) {
979 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
980 cmd[0] = TEST_UNIT_READY;
981 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
982 STp->long_timeout, MAX_READY_RETRIES, 1);
983
984 if (!SRpnt) {
985 retval = (STp->buffer)->syscall_result;
986 break;
987 }
988
989 if (cmdstatp->have_sense) {
990
991 scode = cmdstatp->sense_hdr.sense_key;
992
993 if (scode == UNIT_ATTENTION) { /* New media? */
994 new_session = 1;
995 if (attentions < MAX_ATTENTIONS) {
996 attentions++;
997 continue;
998 }
999 else {
1000 retval = (-EIO);
1001 break;
1002 }
1003 }
1004
1005 if (scode == NOT_READY) {
1006 if (waits < max_wait) {
1007 if (msleep_interruptible(1000)) {
1008 retval = (-EINTR);
1009 break;
1010 }
1011 waits++;
1012 continue;
1013 }
1014 else {
1015 if ((STp->device)->scsi_level >= SCSI_2 &&
1016 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1017 retval = CHKRES_NO_TAPE;
1018 else
1019 retval = CHKRES_NOT_READY;
1020 break;
1021 }
1022 }
1023 }
1024
1025 retval = (STp->buffer)->syscall_result;
1026 if (!retval)
1027 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1028 break;
1029 }
1030
1031 if (SRpnt != NULL)
1032 st_release_request(SRpnt);
1033 return retval;
1034}
1035
1036
1037/* See if the drive is ready and gather information about the tape. Return values:
1038 < 0 negative error code from errno.h
1039 0 drive ready
1040 1 drive not ready (possibly no tape)
1041*/
1042static int check_tape(struct scsi_tape *STp, struct file *filp)
1043{
1044 int i, retval, new_session = 0, do_wait;
1045 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1046 unsigned short st_flags = filp->f_flags;
1047 struct st_request *SRpnt = NULL;
1048 struct st_modedef *STm;
1049 struct st_partstat *STps;
1050 struct inode *inode = file_inode(filp);
1051 int mode = TAPE_MODE(inode);
1052
1053 STp->ready = ST_READY;
1054
1055 if (mode != STp->current_mode) {
1056 DEBC_printk(STp, "Mode change from %d to %d.\n",
1057 STp->current_mode, mode);
1058 new_session = 1;
1059 STp->current_mode = mode;
1060 }
1061 STm = &(STp->modes[STp->current_mode]);
1062
1063 saved_cleaning = STp->cleaning_req;
1064 STp->cleaning_req = 0;
1065
1066 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1067 retval = test_ready(STp, do_wait);
1068
1069 if (retval < 0)
1070 goto err_out;
1071
1072 if (retval == CHKRES_NEW_SESSION) {
1073 STp->pos_unknown = 0;
1074 STp->partition = STp->new_partition = 0;
1075 if (STp->can_partitions)
1076 STp->nbr_partitions = 1; /* This guess will be updated later
1077 if necessary */
1078 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1079 STps = &(STp->ps[i]);
1080 STps->rw = ST_IDLE;
1081 STps->eof = ST_NOEOF;
1082 STps->at_sm = 0;
1083 STps->last_block_valid = 0;
1084 STps->drv_block = 0;
1085 STps->drv_file = 0;
1086 }
1087 new_session = 1;
1088 }
1089 else {
1090 STp->cleaning_req |= saved_cleaning;
1091
1092 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1093 if (retval == CHKRES_NO_TAPE)
1094 STp->ready = ST_NO_TAPE;
1095 else
1096 STp->ready = ST_NOT_READY;
1097
1098 STp->density = 0; /* Clear the erroneous "residue" */
1099 STp->write_prot = 0;
1100 STp->block_size = 0;
1101 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1102 STp->partition = STp->new_partition = 0;
1103 STp->door_locked = ST_UNLOCKED;
1104 return CHKRES_NOT_READY;
1105 }
1106 }
1107
1108 if (STp->omit_blklims)
1109 STp->min_block = STp->max_block = (-1);
1110 else {
1111 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1112 cmd[0] = READ_BLOCK_LIMITS;
1113
1114 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1115 STp->device->request_queue->rq_timeout,
1116 MAX_READY_RETRIES, 1);
1117 if (!SRpnt) {
1118 retval = (STp->buffer)->syscall_result;
1119 goto err_out;
1120 }
1121
1122 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1123 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1124 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1125 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1126 (STp->buffer)->b_data[5];
1127 if ( DEB( debugging || ) !STp->inited)
1128 st_printk(KERN_INFO, STp,
1129 "Block limits %d - %d bytes.\n",
1130 STp->min_block, STp->max_block);
1131 } else {
1132 STp->min_block = STp->max_block = (-1);
1133 DEBC_printk(STp, "Can't read block limits.\n");
1134 }
1135 }
1136
1137 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1138 cmd[0] = MODE_SENSE;
1139 cmd[4] = 12;
1140
1141 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1142 STp->device->request_queue->rq_timeout,
1143 MAX_READY_RETRIES, 1);
1144 if (!SRpnt) {
1145 retval = (STp->buffer)->syscall_result;
1146 goto err_out;
1147 }
1148
1149 if ((STp->buffer)->syscall_result != 0) {
1150 DEBC_printk(STp, "No Mode Sense.\n");
1151 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1152 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1153 STp->drv_write_prot = 0;
1154 } else {
1155 DEBC_printk(STp,"Mode sense. Length %d, "
1156 "medium %x, WBS %x, BLL %d\n",
1157 (STp->buffer)->b_data[0],
1158 (STp->buffer)->b_data[1],
1159 (STp->buffer)->b_data[2],
1160 (STp->buffer)->b_data[3]);
1161
1162 if ((STp->buffer)->b_data[3] >= 8) {
1163 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1164 STp->density = (STp->buffer)->b_data[4];
1165 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1166 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1167 DEBC_printk(STp, "Density %x, tape length: %x, "
1168 "drv buffer: %d\n",
1169 STp->density,
1170 (STp->buffer)->b_data[5] * 65536 +
1171 (STp->buffer)->b_data[6] * 256 +
1172 (STp->buffer)->b_data[7],
1173 STp->drv_buffer);
1174 }
1175 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1176 if (!STp->drv_buffer && STp->immediate_filemark) {
1177 st_printk(KERN_WARNING, STp,
1178 "non-buffered tape: disabling "
1179 "writing immediate filemarks\n");
1180 STp->immediate_filemark = 0;
1181 }
1182 }
1183 st_release_request(SRpnt);
1184 SRpnt = NULL;
1185 STp->inited = 1;
1186
1187 if (STp->block_size > 0)
1188 (STp->buffer)->buffer_blocks =
1189 (STp->buffer)->buffer_size / STp->block_size;
1190 else
1191 (STp->buffer)->buffer_blocks = 1;
1192 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1193
1194 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1195 STp->block_size, (STp->buffer)->buffer_size,
1196 (STp->buffer)->buffer_blocks);
1197
1198 if (STp->drv_write_prot) {
1199 STp->write_prot = 1;
1200
1201 DEBC_printk(STp, "Write protected\n");
1202
1203 if (do_wait &&
1204 ((st_flags & O_ACCMODE) == O_WRONLY ||
1205 (st_flags & O_ACCMODE) == O_RDWR)) {
1206 retval = (-EROFS);
1207 goto err_out;
1208 }
1209 }
1210
1211 if (STp->can_partitions && STp->nbr_partitions < 1) {
1212 /* This code is reached when the device is opened for the first time
1213 after the driver has been initialized with tape in the drive and the
1214 partition support has been enabled. */
1215 DEBC_printk(STp, "Updating partition number in status.\n");
1216 if ((STp->partition = find_partition(STp)) < 0) {
1217 retval = STp->partition;
1218 goto err_out;
1219 }
1220 STp->new_partition = STp->partition;
1221 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1222 }
1223
1224 if (new_session) { /* Change the drive parameters for the new mode */
1225 STp->density_changed = STp->blksize_changed = 0;
1226 STp->compression_changed = 0;
1227 if (!(STm->defaults_for_writes) &&
1228 (retval = set_mode_densblk(STp, STm)) < 0)
1229 goto err_out;
1230
1231 if (STp->default_drvbuffer != 0xff) {
1232 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1233 st_printk(KERN_WARNING, STp,
1234 "Can't set default drive "
1235 "buffering to %d.\n",
1236 STp->default_drvbuffer);
1237 }
1238 }
1239
1240 return CHKRES_READY;
1241
1242 err_out:
1243 return retval;
1244}
1245
1246
1247 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1248 module count. */
1249static int st_open(struct inode *inode, struct file *filp)
1250{
1251 int i, retval = (-EIO);
1252 int resumed = 0;
1253 struct scsi_tape *STp;
1254 struct st_partstat *STps;
1255 int dev = TAPE_NR(inode);
1256
1257 /*
1258 * We really want to do nonseekable_open(inode, filp); here, but some
1259 * versions of tar incorrectly call lseek on tapes and bail out if that
1260 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1261 */
1262 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1263
1264 if (!(STp = scsi_tape_get(dev))) {
1265 return -ENXIO;
1266 }
1267
1268 filp->private_data = STp;
1269
1270 spin_lock(&st_use_lock);
1271 if (STp->in_use) {
1272 spin_unlock(&st_use_lock);
1273 DEBC_printk(STp, "Device already in use.\n");
1274 scsi_tape_put(STp);
1275 return (-EBUSY);
1276 }
1277
1278 STp->in_use = 1;
1279 spin_unlock(&st_use_lock);
1280 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1281
1282 if (scsi_autopm_get_device(STp->device) < 0) {
1283 retval = -EIO;
1284 goto err_out;
1285 }
1286 resumed = 1;
1287 if (!scsi_block_when_processing_errors(STp->device)) {
1288 retval = (-ENXIO);
1289 goto err_out;
1290 }
1291
1292 /* See that we have at least a one page buffer available */
1293 if (!enlarge_buffer(STp->buffer, PAGE_SIZE)) {
1294 st_printk(KERN_WARNING, STp,
1295 "Can't allocate one page tape buffer.\n");
1296 retval = (-EOVERFLOW);
1297 goto err_out;
1298 }
1299
1300 (STp->buffer)->cleared = 0;
1301 (STp->buffer)->writing = 0;
1302 (STp->buffer)->syscall_result = 0;
1303
1304 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1305
1306 STp->dirty = 0;
1307 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1308 STps = &(STp->ps[i]);
1309 STps->rw = ST_IDLE;
1310 }
1311 STp->try_dio_now = STp->try_dio;
1312 STp->recover_count = 0;
1313 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1314 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1315
1316 retval = check_tape(STp, filp);
1317 if (retval < 0)
1318 goto err_out;
1319 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1320 retval != CHKRES_READY) {
1321 if (STp->ready == NO_TAPE)
1322 retval = (-ENOMEDIUM);
1323 else
1324 retval = (-EIO);
1325 goto err_out;
1326 }
1327 return 0;
1328
1329 err_out:
1330 normalize_buffer(STp->buffer);
1331 spin_lock(&st_use_lock);
1332 STp->in_use = 0;
1333 spin_unlock(&st_use_lock);
1334 if (resumed)
1335 scsi_autopm_put_device(STp->device);
1336 scsi_tape_put(STp);
1337 return retval;
1338
1339}
1340
1341
1342/* Flush the tape buffer before close */
1343static int st_flush(struct file *filp, fl_owner_t id)
1344{
1345 int result = 0, result2;
1346 unsigned char cmd[MAX_COMMAND_SIZE];
1347 struct st_request *SRpnt;
1348 struct scsi_tape *STp = filp->private_data;
1349 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1350 struct st_partstat *STps = &(STp->ps[STp->partition]);
1351
1352 if (file_count(filp) > 1)
1353 return 0;
1354
1355 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1356 result = st_flush_write_buffer(STp);
1357 if (result != 0 && result != (-ENOSPC))
1358 goto out;
1359 }
1360
1361 if (STp->can_partitions &&
1362 (result2 = switch_partition(STp)) < 0) {
1363 DEBC_printk(STp, "switch_partition at close failed.\n");
1364 if (result == 0)
1365 result = result2;
1366 goto out;
1367 }
1368
1369 DEBC( if (STp->nbr_requests)
1370 st_printk(KERN_DEBUG, STp,
1371 "Number of r/w requests %d, dio used in %d, "
1372 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1373 STp->nbr_pages));
1374
1375 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1376 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1377
1378#if DEBUG
1379 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1380 STp->nbr_waits, STp->nbr_finished);
1381#endif
1382 memset(cmd, 0, MAX_COMMAND_SIZE);
1383 cmd[0] = WRITE_FILEMARKS;
1384 if (STp->immediate_filemark)
1385 cmd[1] = 1;
1386 cmd[4] = 1 + STp->two_fm;
1387
1388 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1389 STp->device->request_queue->rq_timeout,
1390 MAX_WRITE_RETRIES, 1);
1391 if (!SRpnt) {
1392 result = (STp->buffer)->syscall_result;
1393 goto out;
1394 }
1395
1396 if (STp->buffer->syscall_result == 0 ||
1397 (cmdstatp->have_sense && !cmdstatp->deferred &&
1398 (cmdstatp->flags & SENSE_EOM) &&
1399 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1400 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1401 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1402 /* Write successful at EOM */
1403 st_release_request(SRpnt);
1404 SRpnt = NULL;
1405 if (STps->drv_file >= 0)
1406 STps->drv_file++;
1407 STps->drv_block = 0;
1408 if (STp->two_fm)
1409 cross_eof(STp, 0);
1410 STps->eof = ST_FM;
1411 }
1412 else { /* Write error */
1413 st_release_request(SRpnt);
1414 SRpnt = NULL;
1415 st_printk(KERN_ERR, STp,
1416 "Error on write filemark.\n");
1417 if (result == 0)
1418 result = (-EIO);
1419 }
1420
1421 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1422 } else if (!STp->rew_at_close) {
1423 STps = &(STp->ps[STp->partition]);
1424 if (!STm->sysv || STps->rw != ST_READING) {
1425 if (STp->can_bsr)
1426 result = flush_buffer(STp, 0);
1427 else if (STps->eof == ST_FM_HIT) {
1428 result = cross_eof(STp, 0);
1429 if (result) {
1430 if (STps->drv_file >= 0)
1431 STps->drv_file++;
1432 STps->drv_block = 0;
1433 STps->eof = ST_FM;
1434 } else
1435 STps->eof = ST_NOEOF;
1436 }
1437 } else if ((STps->eof == ST_NOEOF &&
1438 !(result = cross_eof(STp, 1))) ||
1439 STps->eof == ST_FM_HIT) {
1440 if (STps->drv_file >= 0)
1441 STps->drv_file++;
1442 STps->drv_block = 0;
1443 STps->eof = ST_FM;
1444 }
1445 }
1446
1447 out:
1448 if (STp->rew_at_close) {
1449 result2 = st_int_ioctl(STp, MTREW, 1);
1450 if (result == 0)
1451 result = result2;
1452 }
1453 return result;
1454}
1455
1456
1457/* Close the device and release it. BKL is not needed: this is the only thread
1458 accessing this tape. */
1459static int st_release(struct inode *inode, struct file *filp)
1460{
1461 struct scsi_tape *STp = filp->private_data;
1462
1463 if (STp->door_locked == ST_LOCKED_AUTO)
1464 do_door_lock(STp, 0);
1465
1466 normalize_buffer(STp->buffer);
1467 spin_lock(&st_use_lock);
1468 STp->in_use = 0;
1469 spin_unlock(&st_use_lock);
1470 scsi_autopm_put_device(STp->device);
1471 scsi_tape_put(STp);
1472
1473 return 0;
1474}
1475
1476/* The checks common to both reading and writing */
1477static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1478{
1479 ssize_t retval = 0;
1480
1481 /*
1482 * If we are in the middle of error recovery, don't let anyone
1483 * else try and use this device. Also, if error recovery fails, it
1484 * may try and take the device offline, in which case all further
1485 * access to the device is prohibited.
1486 */
1487 if (!scsi_block_when_processing_errors(STp->device)) {
1488 retval = (-ENXIO);
1489 goto out;
1490 }
1491
1492 if (STp->ready != ST_READY) {
1493 if (STp->ready == ST_NO_TAPE)
1494 retval = (-ENOMEDIUM);
1495 else
1496 retval = (-EIO);
1497 goto out;
1498 }
1499
1500 if (! STp->modes[STp->current_mode].defined) {
1501 retval = (-ENXIO);
1502 goto out;
1503 }
1504
1505
1506 /*
1507 * If there was a bus reset, block further access
1508 * to this device.
1509 */
1510 if (STp->pos_unknown) {
1511 retval = (-EIO);
1512 goto out;
1513 }
1514
1515 if (count == 0)
1516 goto out;
1517
1518 DEB(
1519 if (!STp->in_use) {
1520 st_printk(ST_DEB_MSG, STp,
1521 "Incorrect device.\n");
1522 retval = (-EIO);
1523 goto out;
1524 } ) /* end DEB */
1525
1526 if (STp->can_partitions &&
1527 (retval = switch_partition(STp)) < 0)
1528 goto out;
1529
1530 if (STp->block_size == 0 && STp->max_block > 0 &&
1531 (count < STp->min_block || count > STp->max_block)) {
1532 retval = (-EINVAL);
1533 goto out;
1534 }
1535
1536 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1537 !do_door_lock(STp, 1))
1538 STp->door_locked = ST_LOCKED_AUTO;
1539
1540 out:
1541 return retval;
1542}
1543
1544
1545static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1546 size_t count, int is_read)
1547{
1548 int i, bufsize, retval = 0;
1549 struct st_buffer *STbp = STp->buffer;
1550
1551 if (is_read)
1552 i = STp->try_dio_now && try_rdio;
1553 else
1554 i = STp->try_dio_now && try_wdio;
1555
1556 if (i && ((unsigned long)buf & queue_dma_alignment(
1557 STp->device->request_queue)) == 0) {
1558 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1559 count, (is_read ? READ : WRITE));
1560 if (i > 0) {
1561 STbp->do_dio = i;
1562 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1563 }
1564 else
1565 STbp->do_dio = 0; /* fall back to buffering with any error */
1566 STbp->sg_segs = STbp->do_dio;
1567 DEB(
1568 if (STbp->do_dio) {
1569 STp->nbr_dio++;
1570 STp->nbr_pages += STbp->do_dio;
1571 }
1572 )
1573 } else
1574 STbp->do_dio = 0;
1575 DEB( STp->nbr_requests++; )
1576
1577 if (!STbp->do_dio) {
1578 if (STp->block_size)
1579 bufsize = STp->block_size > st_fixed_buffer_size ?
1580 STp->block_size : st_fixed_buffer_size;
1581 else {
1582 bufsize = count;
1583 /* Make sure that data from previous user is not leaked even if
1584 HBA does not return correct residual */
1585 if (is_read && STp->sili && !STbp->cleared)
1586 clear_buffer(STbp);
1587 }
1588
1589 if (bufsize > STbp->buffer_size &&
1590 !enlarge_buffer(STbp, bufsize)) {
1591 st_printk(KERN_WARNING, STp,
1592 "Can't allocate %d byte tape buffer.\n",
1593 bufsize);
1594 retval = (-EOVERFLOW);
1595 goto out;
1596 }
1597 if (STp->block_size)
1598 STbp->buffer_blocks = bufsize / STp->block_size;
1599 }
1600
1601 out:
1602 return retval;
1603}
1604
1605
1606/* Can be called more than once after each setup_buffer() */
1607static void release_buffering(struct scsi_tape *STp, int is_read)
1608{
1609 struct st_buffer *STbp;
1610
1611 STbp = STp->buffer;
1612 if (STbp->do_dio) {
1613 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1614 STbp->do_dio = 0;
1615 STbp->sg_segs = 0;
1616 }
1617}
1618
1619
1620/* Write command */
1621static ssize_t
1622st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1623{
1624 ssize_t total;
1625 ssize_t i, do_count, blks, transfer;
1626 ssize_t retval;
1627 int undone, retry_eot = 0, scode;
1628 int async_write;
1629 unsigned char cmd[MAX_COMMAND_SIZE];
1630 const char __user *b_point;
1631 struct st_request *SRpnt = NULL;
1632 struct scsi_tape *STp = filp->private_data;
1633 struct st_modedef *STm;
1634 struct st_partstat *STps;
1635 struct st_buffer *STbp;
1636
1637 if (mutex_lock_interruptible(&STp->lock))
1638 return -ERESTARTSYS;
1639
1640 retval = rw_checks(STp, filp, count);
1641 if (retval || count == 0)
1642 goto out;
1643
1644 /* Write must be integral number of blocks */
1645 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1646 st_printk(KERN_WARNING, STp,
1647 "Write not multiple of tape block size.\n");
1648 retval = (-EINVAL);
1649 goto out;
1650 }
1651
1652 STm = &(STp->modes[STp->current_mode]);
1653 STps = &(STp->ps[STp->partition]);
1654
1655 if (STp->write_prot) {
1656 retval = (-EACCES);
1657 goto out;
1658 }
1659
1660
1661 if (STps->rw == ST_READING) {
1662 retval = flush_buffer(STp, 0);
1663 if (retval)
1664 goto out;
1665 STps->rw = ST_WRITING;
1666 } else if (STps->rw != ST_WRITING &&
1667 STps->drv_file == 0 && STps->drv_block == 0) {
1668 if ((retval = set_mode_densblk(STp, STm)) < 0)
1669 goto out;
1670 if (STm->default_compression != ST_DONT_TOUCH &&
1671 !(STp->compression_changed)) {
1672 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1673 st_printk(KERN_WARNING, STp,
1674 "Can't set default compression.\n");
1675 if (modes_defined) {
1676 retval = (-EINVAL);
1677 goto out;
1678 }
1679 }
1680 }
1681 }
1682
1683 STbp = STp->buffer;
1684 i = write_behind_check(STp);
1685 if (i) {
1686 if (i == -ENOSPC)
1687 STps->eof = ST_EOM_OK;
1688 else
1689 STps->eof = ST_EOM_ERROR;
1690 }
1691
1692 if (STps->eof == ST_EOM_OK) {
1693 STps->eof = ST_EOD_1; /* allow next write */
1694 retval = (-ENOSPC);
1695 goto out;
1696 }
1697 else if (STps->eof == ST_EOM_ERROR) {
1698 retval = (-EIO);
1699 goto out;
1700 }
1701
1702 /* Check the buffer readability in cases where copy_user might catch
1703 the problems after some tape movement. */
1704 if (STp->block_size != 0 &&
1705 !STbp->do_dio &&
1706 (copy_from_user(&i, buf, 1) != 0 ||
1707 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1708 retval = (-EFAULT);
1709 goto out;
1710 }
1711
1712 retval = setup_buffering(STp, buf, count, 0);
1713 if (retval)
1714 goto out;
1715
1716 total = count;
1717
1718 memset(cmd, 0, MAX_COMMAND_SIZE);
1719 cmd[0] = WRITE_6;
1720 cmd[1] = (STp->block_size != 0);
1721
1722 STps->rw = ST_WRITING;
1723
1724 b_point = buf;
1725 while (count > 0 && !retry_eot) {
1726
1727 if (STbp->do_dio) {
1728 do_count = count;
1729 }
1730 else {
1731 if (STp->block_size == 0)
1732 do_count = count;
1733 else {
1734 do_count = STbp->buffer_blocks * STp->block_size -
1735 STbp->buffer_bytes;
1736 if (do_count > count)
1737 do_count = count;
1738 }
1739
1740 i = append_to_buffer(b_point, STbp, do_count);
1741 if (i) {
1742 retval = i;
1743 goto out;
1744 }
1745 }
1746 count -= do_count;
1747 b_point += do_count;
1748
1749 async_write = STp->block_size == 0 && !STbp->do_dio &&
1750 STm->do_async_writes && STps->eof < ST_EOM_OK;
1751
1752 if (STp->block_size != 0 && STm->do_buffer_writes &&
1753 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1754 STbp->buffer_bytes < STbp->buffer_size) {
1755 STp->dirty = 1;
1756 /* Don't write a buffer that is not full enough. */
1757 if (!async_write && count == 0)
1758 break;
1759 }
1760
1761 retry_write:
1762 if (STp->block_size == 0)
1763 blks = transfer = do_count;
1764 else {
1765 if (!STbp->do_dio)
1766 blks = STbp->buffer_bytes;
1767 else
1768 blks = do_count;
1769 blks /= STp->block_size;
1770 transfer = blks * STp->block_size;
1771 }
1772 cmd[2] = blks >> 16;
1773 cmd[3] = blks >> 8;
1774 cmd[4] = blks;
1775
1776 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1777 STp->device->request_queue->rq_timeout,
1778 MAX_WRITE_RETRIES, !async_write);
1779 if (!SRpnt) {
1780 retval = STbp->syscall_result;
1781 goto out;
1782 }
1783 if (async_write && !STbp->syscall_result) {
1784 STbp->writing = transfer;
1785 STp->dirty = !(STbp->writing ==
1786 STbp->buffer_bytes);
1787 SRpnt = NULL; /* Prevent releasing this request! */
1788 DEB( STp->write_pending = 1; )
1789 break;
1790 }
1791
1792 if (STbp->syscall_result != 0) {
1793 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1794
1795 DEBC_printk(STp, "Error on write:\n");
1796 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1797 scode = cmdstatp->sense_hdr.sense_key;
1798 if (cmdstatp->remainder_valid)
1799 undone = (int)cmdstatp->uremainder64;
1800 else if (STp->block_size == 0 &&
1801 scode == VOLUME_OVERFLOW)
1802 undone = transfer;
1803 else
1804 undone = 0;
1805 if (STp->block_size != 0)
1806 undone *= STp->block_size;
1807 if (undone <= do_count) {
1808 /* Only data from this write is not written */
1809 count += undone;
1810 b_point -= undone;
1811 do_count -= undone;
1812 if (STp->block_size)
1813 blks = (transfer - undone) / STp->block_size;
1814 STps->eof = ST_EOM_OK;
1815 /* Continue in fixed block mode if all written
1816 in this request but still something left to write
1817 (retval left to zero)
1818 */
1819 if (STp->block_size == 0 ||
1820 undone > 0 || count == 0)
1821 retval = (-ENOSPC); /* EOM within current request */
1822 DEBC_printk(STp, "EOM with %d "
1823 "bytes unwritten.\n",
1824 (int)count);
1825 } else {
1826 /* EOT within data buffered earlier (possible only
1827 in fixed block mode without direct i/o) */
1828 if (!retry_eot && !cmdstatp->deferred &&
1829 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1830 move_buffer_data(STp->buffer, transfer - undone);
1831 retry_eot = 1;
1832 if (STps->drv_block >= 0) {
1833 STps->drv_block += (transfer - undone) /
1834 STp->block_size;
1835 }
1836 STps->eof = ST_EOM_OK;
1837 DEBC_printk(STp, "Retry "
1838 "write of %d "
1839 "bytes at EOM.\n",
1840 STp->buffer->buffer_bytes);
1841 goto retry_write;
1842 }
1843 else {
1844 /* Either error within data buffered by driver or
1845 failed retry */
1846 count -= do_count;
1847 blks = do_count = 0;
1848 STps->eof = ST_EOM_ERROR;
1849 STps->drv_block = (-1); /* Too cautious? */
1850 retval = (-EIO); /* EOM for old data */
1851 DEBC_printk(STp, "EOM with "
1852 "lost data.\n");
1853 }
1854 }
1855 } else {
1856 count += do_count;
1857 STps->drv_block = (-1); /* Too cautious? */
1858 retval = STbp->syscall_result;
1859 }
1860
1861 }
1862
1863 if (STps->drv_block >= 0) {
1864 if (STp->block_size == 0)
1865 STps->drv_block += (do_count > 0);
1866 else
1867 STps->drv_block += blks;
1868 }
1869
1870 STbp->buffer_bytes = 0;
1871 STp->dirty = 0;
1872
1873 if (retval || retry_eot) {
1874 if (count < total)
1875 retval = total - count;
1876 goto out;
1877 }
1878 }
1879
1880 if (STps->eof == ST_EOD_1)
1881 STps->eof = ST_EOM_OK;
1882 else if (STps->eof != ST_EOM_OK)
1883 STps->eof = ST_NOEOF;
1884 retval = total - count;
1885
1886 out:
1887 if (SRpnt != NULL)
1888 st_release_request(SRpnt);
1889 release_buffering(STp, 0);
1890 mutex_unlock(&STp->lock);
1891
1892 return retval;
1893}
1894
1895/* Read data from the tape. Returns zero in the normal case, one if the
1896 eof status has changed, and the negative error code in case of a
1897 fatal error. Otherwise updates the buffer and the eof state.
1898
1899 Does release user buffer mapping if it is set.
1900*/
1901static long read_tape(struct scsi_tape *STp, long count,
1902 struct st_request ** aSRpnt)
1903{
1904 int transfer, blks, bytes;
1905 unsigned char cmd[MAX_COMMAND_SIZE];
1906 struct st_request *SRpnt;
1907 struct st_modedef *STm;
1908 struct st_partstat *STps;
1909 struct st_buffer *STbp;
1910 int retval = 0;
1911
1912 if (count == 0)
1913 return 0;
1914
1915 STm = &(STp->modes[STp->current_mode]);
1916 STps = &(STp->ps[STp->partition]);
1917 if (STps->eof == ST_FM_HIT)
1918 return 1;
1919 STbp = STp->buffer;
1920
1921 if (STp->block_size == 0)
1922 blks = bytes = count;
1923 else {
1924 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1925 blks = (STp->buffer)->buffer_blocks;
1926 bytes = blks * STp->block_size;
1927 } else {
1928 bytes = count;
1929 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1930 bytes = (STp->buffer)->buffer_size;
1931 blks = bytes / STp->block_size;
1932 bytes = blks * STp->block_size;
1933 }
1934 }
1935
1936 memset(cmd, 0, MAX_COMMAND_SIZE);
1937 cmd[0] = READ_6;
1938 cmd[1] = (STp->block_size != 0);
1939 if (!cmd[1] && STp->sili)
1940 cmd[1] |= 2;
1941 cmd[2] = blks >> 16;
1942 cmd[3] = blks >> 8;
1943 cmd[4] = blks;
1944
1945 SRpnt = *aSRpnt;
1946 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1947 STp->device->request_queue->rq_timeout,
1948 MAX_RETRIES, 1);
1949 release_buffering(STp, 1);
1950 *aSRpnt = SRpnt;
1951 if (!SRpnt)
1952 return STbp->syscall_result;
1953
1954 STbp->read_pointer = 0;
1955 STps->at_sm = 0;
1956
1957 /* Something to check */
1958 if (STbp->syscall_result) {
1959 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1960
1961 retval = 1;
1962 DEBC_printk(STp,
1963 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1964 SRpnt->sense[0], SRpnt->sense[1],
1965 SRpnt->sense[2], SRpnt->sense[3],
1966 SRpnt->sense[4], SRpnt->sense[5],
1967 SRpnt->sense[6], SRpnt->sense[7]);
1968 if (cmdstatp->have_sense) {
1969
1970 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1971 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1972
1973 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1974 /* Compute the residual count */
1975 if (cmdstatp->remainder_valid)
1976 transfer = (int)cmdstatp->uremainder64;
1977 else
1978 transfer = 0;
1979 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1980 if (STp->block_size == 0)
1981 transfer = bytes;
1982 /* Some drives set ILI with MEDIUM ERROR */
1983 cmdstatp->flags &= ~SENSE_ILI;
1984 }
1985
1986 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1987 if (STp->block_size == 0 &&
1988 transfer < 0) {
1989 st_printk(KERN_NOTICE, STp,
1990 "Failed to read %d "
1991 "byte block with %d "
1992 "byte transfer.\n",
1993 bytes - transfer,
1994 bytes);
1995 if (STps->drv_block >= 0)
1996 STps->drv_block += 1;
1997 STbp->buffer_bytes = 0;
1998 return (-ENOMEM);
1999 } else if (STp->block_size == 0) {
2000 STbp->buffer_bytes = bytes - transfer;
2001 } else {
2002 st_release_request(SRpnt);
2003 SRpnt = *aSRpnt = NULL;
2004 if (transfer == blks) { /* We did not get anything, error */
2005 st_printk(KERN_NOTICE, STp,
2006 "Incorrect "
2007 "block size.\n");
2008 if (STps->drv_block >= 0)
2009 STps->drv_block += blks - transfer + 1;
2010 st_int_ioctl(STp, MTBSR, 1);
2011 return (-EIO);
2012 }
2013 /* We have some data, deliver it */
2014 STbp->buffer_bytes = (blks - transfer) *
2015 STp->block_size;
2016 DEBC_printk(STp, "ILI but "
2017 "enough data "
2018 "received %ld "
2019 "%d.\n", count,
2020 STbp->buffer_bytes);
2021 if (STps->drv_block >= 0)
2022 STps->drv_block += 1;
2023 if (st_int_ioctl(STp, MTBSR, 1))
2024 return (-EIO);
2025 }
2026 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2027 if (STps->eof != ST_FM_HIT)
2028 STps->eof = ST_FM_HIT;
2029 else
2030 STps->eof = ST_EOD_2;
2031 if (STp->block_size == 0)
2032 STbp->buffer_bytes = 0;
2033 else
2034 STbp->buffer_bytes =
2035 bytes - transfer * STp->block_size;
2036 DEBC_printk(STp, "EOF detected (%d "
2037 "bytes read).\n",
2038 STbp->buffer_bytes);
2039 } else if (cmdstatp->flags & SENSE_EOM) {
2040 if (STps->eof == ST_FM)
2041 STps->eof = ST_EOD_1;
2042 else
2043 STps->eof = ST_EOM_OK;
2044 if (STp->block_size == 0)
2045 STbp->buffer_bytes = bytes - transfer;
2046 else
2047 STbp->buffer_bytes =
2048 bytes - transfer * STp->block_size;
2049
2050 DEBC_printk(STp, "EOM detected (%d "
2051 "bytes read).\n",
2052 STbp->buffer_bytes);
2053 }
2054 }
2055 /* end of EOF, EOM, ILI test */
2056 else { /* nonzero sense key */
2057 DEBC_printk(STp, "Tape error while reading.\n");
2058 STps->drv_block = (-1);
2059 if (STps->eof == ST_FM &&
2060 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2061 DEBC_printk(STp, "Zero returned for "
2062 "first BLANK CHECK "
2063 "after EOF.\n");
2064 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2065 } else /* Some other extended sense code */
2066 retval = (-EIO);
2067 }
2068
2069 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2070 STbp->buffer_bytes = 0;
2071 }
2072 /* End of extended sense test */
2073 else { /* Non-extended sense */
2074 retval = STbp->syscall_result;
2075 }
2076
2077 }
2078 /* End of error handling */
2079 else { /* Read successful */
2080 STbp->buffer_bytes = bytes;
2081 if (STp->sili) /* In fixed block mode residual is always zero here */
2082 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2083 }
2084
2085 if (STps->drv_block >= 0) {
2086 if (STp->block_size == 0)
2087 STps->drv_block++;
2088 else
2089 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2090 }
2091 return retval;
2092}
2093
2094
2095/* Read command */
2096static ssize_t
2097st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2098{
2099 ssize_t total;
2100 ssize_t retval = 0;
2101 ssize_t i, transfer;
2102 int special, do_dio = 0;
2103 struct st_request *SRpnt = NULL;
2104 struct scsi_tape *STp = filp->private_data;
2105 struct st_modedef *STm;
2106 struct st_partstat *STps;
2107 struct st_buffer *STbp = STp->buffer;
2108
2109 if (mutex_lock_interruptible(&STp->lock))
2110 return -ERESTARTSYS;
2111
2112 retval = rw_checks(STp, filp, count);
2113 if (retval || count == 0)
2114 goto out;
2115
2116 STm = &(STp->modes[STp->current_mode]);
2117 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2118 if (!STm->do_read_ahead) {
2119 retval = (-EINVAL); /* Read must be integral number of blocks */
2120 goto out;
2121 }
2122 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2123 }
2124
2125 STps = &(STp->ps[STp->partition]);
2126 if (STps->rw == ST_WRITING) {
2127 retval = flush_buffer(STp, 0);
2128 if (retval)
2129 goto out;
2130 STps->rw = ST_READING;
2131 }
2132 DEB(
2133 if (debugging && STps->eof != ST_NOEOF)
2134 st_printk(ST_DEB_MSG, STp,
2135 "EOF/EOM flag up (%d). Bytes %d\n",
2136 STps->eof, STbp->buffer_bytes);
2137 ) /* end DEB */
2138
2139 retval = setup_buffering(STp, buf, count, 1);
2140 if (retval)
2141 goto out;
2142 do_dio = STbp->do_dio;
2143
2144 if (STbp->buffer_bytes == 0 &&
2145 STps->eof >= ST_EOD_1) {
2146 if (STps->eof < ST_EOD) {
2147 STps->eof += 1;
2148 retval = 0;
2149 goto out;
2150 }
2151 retval = (-EIO); /* EOM or Blank Check */
2152 goto out;
2153 }
2154
2155 if (do_dio) {
2156 /* Check the buffer writability before any tape movement. Don't alter
2157 buffer data. */
2158 if (copy_from_user(&i, buf, 1) != 0 ||
2159 copy_to_user(buf, &i, 1) != 0 ||
2160 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2161 copy_to_user(buf + count - 1, &i, 1) != 0) {
2162 retval = (-EFAULT);
2163 goto out;
2164 }
2165 }
2166
2167 STps->rw = ST_READING;
2168
2169
2170 /* Loop until enough data in buffer or a special condition found */
2171 for (total = 0, special = 0; total < count && !special;) {
2172
2173 /* Get new data if the buffer is empty */
2174 if (STbp->buffer_bytes == 0) {
2175 special = read_tape(STp, count - total, &SRpnt);
2176 if (special < 0) { /* No need to continue read */
2177 retval = special;
2178 goto out;
2179 }
2180 }
2181
2182 /* Move the data from driver buffer to user buffer */
2183 if (STbp->buffer_bytes > 0) {
2184 DEB(
2185 if (debugging && STps->eof != ST_NOEOF)
2186 st_printk(ST_DEB_MSG, STp,
2187 "EOF up (%d). Left %d, needed %d.\n",
2188 STps->eof, STbp->buffer_bytes,
2189 (int)(count - total));
2190 ) /* end DEB */
2191 transfer = STbp->buffer_bytes < count - total ?
2192 STbp->buffer_bytes : count - total;
2193 if (!do_dio) {
2194 i = from_buffer(STbp, buf, transfer);
2195 if (i) {
2196 retval = i;
2197 goto out;
2198 }
2199 }
2200 buf += transfer;
2201 total += transfer;
2202 }
2203
2204 if (STp->block_size == 0)
2205 break; /* Read only one variable length block */
2206
2207 } /* for (total = 0, special = 0;
2208 total < count && !special; ) */
2209
2210 /* Change the eof state if no data from tape or buffer */
2211 if (total == 0) {
2212 if (STps->eof == ST_FM_HIT) {
2213 STps->eof = ST_FM;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_1) {
2218 STps->eof = ST_EOD_2;
2219 STps->drv_block = 0;
2220 if (STps->drv_file >= 0)
2221 STps->drv_file++;
2222 } else if (STps->eof == ST_EOD_2)
2223 STps->eof = ST_EOD;
2224 } else if (STps->eof == ST_FM)
2225 STps->eof = ST_NOEOF;
2226 retval = total;
2227
2228 out:
2229 if (SRpnt != NULL) {
2230 st_release_request(SRpnt);
2231 SRpnt = NULL;
2232 }
2233 if (do_dio) {
2234 release_buffering(STp, 1);
2235 STbp->buffer_bytes = 0;
2236 }
2237 mutex_unlock(&STp->lock);
2238
2239 return retval;
2240}
2241
2242
2243
2244DEB(
2245/* Set the driver options */
2246static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2247{
2248 if (debugging) {
2249 st_printk(KERN_INFO, STp,
2250 "Mode %d options: buffer writes: %d, "
2251 "async writes: %d, read ahead: %d\n",
2252 STp->current_mode, STm->do_buffer_writes,
2253 STm->do_async_writes, STm->do_read_ahead);
2254 st_printk(KERN_INFO, STp,
2255 " can bsr: %d, two FMs: %d, "
2256 "fast mteom: %d, auto lock: %d,\n",
2257 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2258 STp->do_auto_lock);
2259 st_printk(KERN_INFO, STp,
2260 " defs for wr: %d, no block limits: %d, "
2261 "partitions: %d, s2 log: %d\n",
2262 STm->defaults_for_writes, STp->omit_blklims,
2263 STp->can_partitions, STp->scsi2_logical);
2264 st_printk(KERN_INFO, STp,
2265 " sysv: %d nowait: %d sili: %d "
2266 "nowait_filemark: %d\n",
2267 STm->sysv, STp->immediate, STp->sili,
2268 STp->immediate_filemark);
2269 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2270 }
2271}
2272 )
2273
2274
2275static int st_set_options(struct scsi_tape *STp, long options)
2276{
2277 int value;
2278 long code;
2279 struct st_modedef *STm;
2280 struct cdev *cd0, *cd1;
2281 struct device *d0, *d1;
2282
2283 STm = &(STp->modes[STp->current_mode]);
2284 if (!STm->defined) {
2285 cd0 = STm->cdevs[0];
2286 cd1 = STm->cdevs[1];
2287 d0 = STm->devs[0];
2288 d1 = STm->devs[1];
2289 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2290 STm->cdevs[0] = cd0;
2291 STm->cdevs[1] = cd1;
2292 STm->devs[0] = d0;
2293 STm->devs[1] = d1;
2294 modes_defined = 1;
2295 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2296 STp->current_mode);
2297 }
2298
2299 code = options & MT_ST_OPTIONS;
2300 if (code == MT_ST_BOOLEANS) {
2301 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2302 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2303 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2304 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2305 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2306 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2307 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2308 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2309 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2310 if ((STp->device)->scsi_level >= SCSI_2)
2311 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2312 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2313 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2314 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2315 STm->sysv = (options & MT_ST_SYSV) != 0;
2316 STp->sili = (options & MT_ST_SILI) != 0;
2317 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2318 st_log_options(STp, STm); )
2319 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2320 value = (code == MT_ST_SETBOOLEANS);
2321 if ((options & MT_ST_BUFFER_WRITES) != 0)
2322 STm->do_buffer_writes = value;
2323 if ((options & MT_ST_ASYNC_WRITES) != 0)
2324 STm->do_async_writes = value;
2325 if ((options & MT_ST_DEF_WRITES) != 0)
2326 STm->defaults_for_writes = value;
2327 if ((options & MT_ST_READ_AHEAD) != 0)
2328 STm->do_read_ahead = value;
2329 if ((options & MT_ST_TWO_FM) != 0)
2330 STp->two_fm = value;
2331 if ((options & MT_ST_FAST_MTEOM) != 0)
2332 STp->fast_mteom = value;
2333 if ((options & MT_ST_AUTO_LOCK) != 0)
2334 STp->do_auto_lock = value;
2335 if ((options & MT_ST_CAN_BSR) != 0)
2336 STp->can_bsr = value;
2337 if ((options & MT_ST_NO_BLKLIMS) != 0)
2338 STp->omit_blklims = value;
2339 if ((STp->device)->scsi_level >= SCSI_2 &&
2340 (options & MT_ST_CAN_PARTITIONS) != 0)
2341 STp->can_partitions = value;
2342 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2343 STp->scsi2_logical = value;
2344 if ((options & MT_ST_NOWAIT) != 0)
2345 STp->immediate = value;
2346 if ((options & MT_ST_NOWAIT_EOF) != 0)
2347 STp->immediate_filemark = value;
2348 if ((options & MT_ST_SYSV) != 0)
2349 STm->sysv = value;
2350 if ((options & MT_ST_SILI) != 0)
2351 STp->sili = value;
2352 DEB(
2353 if ((options & MT_ST_DEBUGGING) != 0)
2354 debugging = value;
2355 st_log_options(STp, STm); )
2356 } else if (code == MT_ST_WRITE_THRESHOLD) {
2357 /* Retained for compatibility */
2358 } else if (code == MT_ST_DEF_BLKSIZE) {
2359 value = (options & ~MT_ST_OPTIONS);
2360 if (value == ~MT_ST_OPTIONS) {
2361 STm->default_blksize = (-1);
2362 DEBC_printk(STp, "Default block size disabled.\n");
2363 } else {
2364 STm->default_blksize = value;
2365 DEBC_printk(STp,"Default block size set to "
2366 "%d bytes.\n", STm->default_blksize);
2367 if (STp->ready == ST_READY) {
2368 STp->blksize_changed = 0;
2369 set_mode_densblk(STp, STm);
2370 }
2371 }
2372 } else if (code == MT_ST_TIMEOUTS) {
2373 value = (options & ~MT_ST_OPTIONS);
2374 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2375 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2376 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2377 (value & ~MT_ST_SET_LONG_TIMEOUT));
2378 } else {
2379 blk_queue_rq_timeout(STp->device->request_queue,
2380 value * HZ);
2381 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2382 value);
2383 }
2384 } else if (code == MT_ST_SET_CLN) {
2385 value = (options & ~MT_ST_OPTIONS) & 0xff;
2386 if (value != 0 &&
2387 (value < EXTENDED_SENSE_START ||
2388 value >= SCSI_SENSE_BUFFERSIZE))
2389 return (-EINVAL);
2390 STp->cln_mode = value;
2391 STp->cln_sense_mask = (options >> 8) & 0xff;
2392 STp->cln_sense_value = (options >> 16) & 0xff;
2393 st_printk(KERN_INFO, STp,
2394 "Cleaning request mode %d, mask %02x, value %02x\n",
2395 value, STp->cln_sense_mask, STp->cln_sense_value);
2396 } else if (code == MT_ST_DEF_OPTIONS) {
2397 code = (options & ~MT_ST_CLEAR_DEFAULT);
2398 value = (options & MT_ST_CLEAR_DEFAULT);
2399 if (code == MT_ST_DEF_DENSITY) {
2400 if (value == MT_ST_CLEAR_DEFAULT) {
2401 STm->default_density = (-1);
2402 DEBC_printk(STp,
2403 "Density default disabled.\n");
2404 } else {
2405 STm->default_density = value & 0xff;
2406 DEBC_printk(STp, "Density default set to %x\n",
2407 STm->default_density);
2408 if (STp->ready == ST_READY) {
2409 STp->density_changed = 0;
2410 set_mode_densblk(STp, STm);
2411 }
2412 }
2413 } else if (code == MT_ST_DEF_DRVBUFFER) {
2414 if (value == MT_ST_CLEAR_DEFAULT) {
2415 STp->default_drvbuffer = 0xff;
2416 DEBC_printk(STp,
2417 "Drive buffer default disabled.\n");
2418 } else {
2419 STp->default_drvbuffer = value & 7;
2420 DEBC_printk(STp,
2421 "Drive buffer default set to %x\n",
2422 STp->default_drvbuffer);
2423 if (STp->ready == ST_READY)
2424 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2425 }
2426 } else if (code == MT_ST_DEF_COMPRESSION) {
2427 if (value == MT_ST_CLEAR_DEFAULT) {
2428 STm->default_compression = ST_DONT_TOUCH;
2429 DEBC_printk(STp,
2430 "Compression default disabled.\n");
2431 } else {
2432 if ((value & 0xff00) != 0) {
2433 STp->c_algo = (value & 0xff00) >> 8;
2434 DEBC_printk(STp, "Compression "
2435 "algorithm set to 0x%x.\n",
2436 STp->c_algo);
2437 }
2438 if ((value & 0xff) != 0xff) {
2439 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2440 DEBC_printk(STp, "Compression default "
2441 "set to %x\n",
2442 (value & 1));
2443 if (STp->ready == ST_READY) {
2444 STp->compression_changed = 0;
2445 st_compression(STp, (STm->default_compression == ST_YES));
2446 }
2447 }
2448 }
2449 }
2450 } else
2451 return (-EIO);
2452
2453 return 0;
2454}
2455
2456#define MODE_HEADER_LENGTH 4
2457
2458/* Mode header and page byte offsets */
2459#define MH_OFF_DATA_LENGTH 0
2460#define MH_OFF_MEDIUM_TYPE 1
2461#define MH_OFF_DEV_SPECIFIC 2
2462#define MH_OFF_BDESCS_LENGTH 3
2463#define MP_OFF_PAGE_NBR 0
2464#define MP_OFF_PAGE_LENGTH 1
2465
2466/* Mode header and page bit masks */
2467#define MH_BIT_WP 0x80
2468#define MP_MSK_PAGE_NBR 0x3f
2469
2470/* Don't return block descriptors */
2471#define MODE_SENSE_OMIT_BDESCS 0x08
2472
2473#define MODE_SELECT_PAGE_FORMAT 0x10
2474
2475/* Read a mode page into the tape buffer. The block descriptors are included
2476 if incl_block_descs is true. The page control is ored to the page number
2477 parameter, if necessary. */
2478static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2479{
2480 unsigned char cmd[MAX_COMMAND_SIZE];
2481 struct st_request *SRpnt;
2482
2483 memset(cmd, 0, MAX_COMMAND_SIZE);
2484 cmd[0] = MODE_SENSE;
2485 if (omit_block_descs)
2486 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2487 cmd[2] = page;
2488 cmd[4] = 255;
2489
2490 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2491 STp->device->request_queue->rq_timeout, 0, 1);
2492 if (SRpnt == NULL)
2493 return (STp->buffer)->syscall_result;
2494
2495 st_release_request(SRpnt);
2496
2497 return STp->buffer->syscall_result;
2498}
2499
2500
2501/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2502 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2503static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2504{
2505 int pgo;
2506 unsigned char cmd[MAX_COMMAND_SIZE];
2507 struct st_request *SRpnt;
2508 int timeout;
2509
2510 memset(cmd, 0, MAX_COMMAND_SIZE);
2511 cmd[0] = MODE_SELECT;
2512 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2513 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2514 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2515
2516 /* Clear reserved fields */
2517 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2518 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2519 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2520 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2521
2522 timeout = slow ?
2523 STp->long_timeout : STp->device->request_queue->rq_timeout;
2524 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2525 timeout, 0, 1);
2526 if (SRpnt == NULL)
2527 return (STp->buffer)->syscall_result;
2528
2529 st_release_request(SRpnt);
2530
2531 return STp->buffer->syscall_result;
2532}
2533
2534
2535#define COMPRESSION_PAGE 0x0f
2536#define COMPRESSION_PAGE_LENGTH 16
2537
2538#define CP_OFF_DCE_DCC 2
2539#define CP_OFF_C_ALGO 7
2540
2541#define DCE_MASK 0x80
2542#define DCC_MASK 0x40
2543#define RED_MASK 0x60
2544
2545
2546/* Control the compression with mode page 15. Algorithm not changed if zero.
2547
2548 The block descriptors are read and written because Sony SDT-7000 does not
2549 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2550 Including block descriptors should not cause any harm to other drives. */
2551
2552static int st_compression(struct scsi_tape * STp, int state)
2553{
2554 int retval;
2555 int mpoffs; /* Offset to mode page start */
2556 unsigned char *b_data = (STp->buffer)->b_data;
2557
2558 if (STp->ready != ST_READY)
2559 return (-EIO);
2560
2561 /* Read the current page contents */
2562 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2563 if (retval) {
2564 DEBC_printk(STp, "Compression mode page not supported.\n");
2565 return (-EIO);
2566 }
2567
2568 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2569 DEBC_printk(STp, "Compression state is %d.\n",
2570 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2571
2572 /* Check if compression can be changed */
2573 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2574 DEBC_printk(STp, "Compression not supported.\n");
2575 return (-EIO);
2576 }
2577
2578 /* Do the change */
2579 if (state) {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2583 }
2584 else {
2585 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2586 if (STp->c_algo != 0)
2587 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2588 }
2589
2590 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2591 if (retval) {
2592 DEBC_printk(STp, "Compression change failed.\n");
2593 return (-EIO);
2594 }
2595 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2596
2597 STp->compression_changed = 1;
2598 return 0;
2599}
2600
2601
2602/* Process the load and unload commands (does unload if the load code is zero) */
2603static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2604{
2605 int retval = (-EIO), timeout;
2606 unsigned char cmd[MAX_COMMAND_SIZE];
2607 struct st_partstat *STps;
2608 struct st_request *SRpnt;
2609
2610 if (STp->ready != ST_READY && !load_code) {
2611 if (STp->ready == ST_NO_TAPE)
2612 return (-ENOMEDIUM);
2613 else
2614 return (-EIO);
2615 }
2616
2617 memset(cmd, 0, MAX_COMMAND_SIZE);
2618 cmd[0] = START_STOP;
2619 if (load_code)
2620 cmd[4] |= 1;
2621 /*
2622 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2623 */
2624 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2625 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2626 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2627 (cmd[4]) ? "" : "un",
2628 load_code - MT_ST_HPLOADER_OFFSET);
2629 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2630 }
2631 if (STp->immediate) {
2632 cmd[1] = 1; /* Don't wait for completion */
2633 timeout = STp->device->request_queue->rq_timeout;
2634 }
2635 else
2636 timeout = STp->long_timeout;
2637
2638 DEBC(
2639 if (!load_code)
2640 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2641 else
2642 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2643 );
2644
2645 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2646 timeout, MAX_RETRIES, 1);
2647 if (!SRpnt)
2648 return (STp->buffer)->syscall_result;
2649
2650 retval = (STp->buffer)->syscall_result;
2651 st_release_request(SRpnt);
2652
2653 if (!retval) { /* SCSI command successful */
2654
2655 if (!load_code) {
2656 STp->rew_at_close = 0;
2657 STp->ready = ST_NO_TAPE;
2658 }
2659 else {
2660 STp->rew_at_close = STp->autorew_dev;
2661 retval = check_tape(STp, filp);
2662 if (retval > 0)
2663 retval = 0;
2664 }
2665 }
2666 else {
2667 STps = &(STp->ps[STp->partition]);
2668 STps->drv_file = STps->drv_block = (-1);
2669 }
2670
2671 return retval;
2672}
2673
2674#if DEBUG
2675#define ST_DEB_FORWARD 0
2676#define ST_DEB_BACKWARD 1
2677static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2678{
2679 s32 sc;
2680
2681 if (!debugging)
2682 return;
2683
2684 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
2685 if (direction)
2686 sc = -sc;
2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2688 direction ? "backward" : "forward", sc, units);
2689}
2690#else
2691#define ST_DEB_FORWARD 0
2692#define ST_DEB_BACKWARD 1
2693static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2694#endif
2695
2696
2697/* Internal ioctl function */
2698static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2699{
2700 int timeout;
2701 long ltmp;
2702 int ioctl_result;
2703 int chg_eof = 1;
2704 unsigned char cmd[MAX_COMMAND_SIZE];
2705 struct st_request *SRpnt;
2706 struct st_partstat *STps;
2707 int fileno, blkno, at_sm, undone;
2708 int datalen = 0, direction = DMA_NONE;
2709
2710 WARN_ON(STp->buffer->do_dio != 0);
2711 if (STp->ready != ST_READY) {
2712 if (STp->ready == ST_NO_TAPE)
2713 return (-ENOMEDIUM);
2714 else
2715 return (-EIO);
2716 }
2717 timeout = STp->long_timeout;
2718 STps = &(STp->ps[STp->partition]);
2719 fileno = STps->drv_file;
2720 blkno = STps->drv_block;
2721 at_sm = STps->at_sm;
2722
2723 memset(cmd, 0, MAX_COMMAND_SIZE);
2724 switch (cmd_in) {
2725 case MTFSFM:
2726 chg_eof = 0; /* Changed from the FSF after this */
2727 fallthrough;
2728 case MTFSF:
2729 cmd[0] = SPACE;
2730 cmd[1] = 0x01; /* Space FileMarks */
2731 cmd[2] = (arg >> 16);
2732 cmd[3] = (arg >> 8);
2733 cmd[4] = arg;
2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2735 if (fileno >= 0)
2736 fileno += arg;
2737 blkno = 0;
2738 at_sm &= (arg == 0);
2739 break;
2740 case MTBSFM:
2741 chg_eof = 0; /* Changed from the FSF after this */
2742 fallthrough;
2743 case MTBSF:
2744 cmd[0] = SPACE;
2745 cmd[1] = 0x01; /* Space FileMarks */
2746 ltmp = (-arg);
2747 cmd[2] = (ltmp >> 16);
2748 cmd[3] = (ltmp >> 8);
2749 cmd[4] = ltmp;
2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2751 if (fileno >= 0)
2752 fileno -= arg;
2753 blkno = (-1); /* We can't know the block number */
2754 at_sm &= (arg == 0);
2755 break;
2756 case MTFSR:
2757 cmd[0] = SPACE;
2758 cmd[1] = 0x00; /* Space Blocks */
2759 cmd[2] = (arg >> 16);
2760 cmd[3] = (arg >> 8);
2761 cmd[4] = arg;
2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2763 if (blkno >= 0)
2764 blkno += arg;
2765 at_sm &= (arg == 0);
2766 break;
2767 case MTBSR:
2768 cmd[0] = SPACE;
2769 cmd[1] = 0x00; /* Space Blocks */
2770 ltmp = (-arg);
2771 cmd[2] = (ltmp >> 16);
2772 cmd[3] = (ltmp >> 8);
2773 cmd[4] = ltmp;
2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2775 if (blkno >= 0)
2776 blkno -= arg;
2777 at_sm &= (arg == 0);
2778 break;
2779 case MTFSS:
2780 cmd[0] = SPACE;
2781 cmd[1] = 0x04; /* Space Setmarks */
2782 cmd[2] = (arg >> 16);
2783 cmd[3] = (arg >> 8);
2784 cmd[4] = arg;
2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2786 if (arg != 0) {
2787 blkno = fileno = (-1);
2788 at_sm = 1;
2789 }
2790 break;
2791 case MTBSS:
2792 cmd[0] = SPACE;
2793 cmd[1] = 0x04; /* Space Setmarks */
2794 ltmp = (-arg);
2795 cmd[2] = (ltmp >> 16);
2796 cmd[3] = (ltmp >> 8);
2797 cmd[4] = ltmp;
2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2799 if (arg != 0) {
2800 blkno = fileno = (-1);
2801 at_sm = 1;
2802 }
2803 break;
2804 case MTWEOF:
2805 case MTWEOFI:
2806 case MTWSM:
2807 if (STp->write_prot)
2808 return (-EACCES);
2809 cmd[0] = WRITE_FILEMARKS;
2810 if (cmd_in == MTWSM)
2811 cmd[1] = 2;
2812 if (cmd_in == MTWEOFI ||
2813 (cmd_in == MTWEOF && STp->immediate_filemark))
2814 cmd[1] |= 1;
2815 cmd[2] = (arg >> 16);
2816 cmd[3] = (arg >> 8);
2817 cmd[4] = arg;
2818 timeout = STp->device->request_queue->rq_timeout;
2819 DEBC(
2820 if (cmd_in != MTWSM)
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d filemarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 else
2827 st_printk(ST_DEB_MSG, STp,
2828 "Writing %d setmarks.\n",
2829 cmd[2] * 65536 +
2830 cmd[3] * 256 +
2831 cmd[4]);
2832 )
2833 if (fileno >= 0)
2834 fileno += arg;
2835 blkno = 0;
2836 at_sm = (cmd_in == MTWSM);
2837 break;
2838 case MTREW:
2839 cmd[0] = REZERO_UNIT;
2840 if (STp->immediate) {
2841 cmd[1] = 1; /* Don't wait for completion */
2842 timeout = STp->device->request_queue->rq_timeout;
2843 }
2844 DEBC_printk(STp, "Rewinding tape.\n");
2845 fileno = blkno = at_sm = 0;
2846 break;
2847 case MTNOP:
2848 DEBC_printk(STp, "No op on tape.\n");
2849 return 0; /* Should do something ? */
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(struct file *file, unsigned int cmd_in, unsigned long arg)
3504{
3505 void __user *p = (void __user *)arg;
3506 int i, cmd_nr, cmd_type, bt;
3507 int retval = 0;
3508 unsigned int blk;
3509 struct scsi_tape *STp = file->private_data;
3510 struct st_modedef *STm;
3511 struct st_partstat *STps;
3512
3513 if (mutex_lock_interruptible(&STp->lock))
3514 return -ERESTARTSYS;
3515
3516 DEB(
3517 if (debugging && !STp->in_use) {
3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3519 retval = (-EIO);
3520 goto out;
3521 } ) /* end DEB */
3522
3523 STm = &(STp->modes[STp->current_mode]);
3524 STps = &(STp->ps[STp->partition]);
3525
3526 /*
3527 * If we are in the middle of error recovery, don't let anyone
3528 * else try and use this device. Also, if error recovery fails, it
3529 * may try and take the device offline, in which case all further
3530 * access to the device is prohibited.
3531 */
3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3533 file->f_flags & O_NDELAY);
3534 if (retval)
3535 goto out;
3536
3537 cmd_type = _IOC_TYPE(cmd_in);
3538 cmd_nr = _IOC_NR(cmd_in);
3539
3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3541 struct mtop mtc;
3542
3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3544 retval = (-EINVAL);
3545 goto out;
3546 }
3547
3548 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3549 if (i) {
3550 retval = (-EFAULT);
3551 goto out;
3552 }
3553
3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3555 st_printk(KERN_WARNING, STp,
3556 "MTSETDRVBUFFER only allowed for root.\n");
3557 retval = (-EPERM);
3558 goto out;
3559 }
3560 if (!STm->defined &&
3561 (mtc.mt_op != MTSETDRVBUFFER &&
3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3563 retval = (-ENXIO);
3564 goto out;
3565 }
3566
3567 if (!STp->pos_unknown) {
3568
3569 if (STps->eof == ST_FM_HIT) {
3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3571 mtc.mt_op == MTEOM) {
3572 mtc.mt_count -= 1;
3573 if (STps->drv_file >= 0)
3574 STps->drv_file += 1;
3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3576 mtc.mt_count += 1;
3577 if (STps->drv_file >= 0)
3578 STps->drv_file += 1;
3579 }
3580 }
3581
3582 if (mtc.mt_op == MTSEEK) {
3583 /* Old position must be restored if partition will be
3584 changed */
3585 i = !STp->can_partitions ||
3586 (STp->new_partition != STp->partition);
3587 } else {
3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3593 mtc.mt_op == MTCOMPRESSION;
3594 }
3595 i = flush_buffer(STp, i);
3596 if (i < 0) {
3597 retval = i;
3598 goto out;
3599 }
3600 if (STps->rw == ST_WRITING &&
3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3602 mtc.mt_op == MTSEEK ||
3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3604 i = st_int_ioctl(STp, MTWEOF, 1);
3605 if (i < 0) {
3606 retval = i;
3607 goto out;
3608 }
3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3610 mtc.mt_count++;
3611 STps->rw = ST_IDLE;
3612 }
3613
3614 } else {
3615 /*
3616 * If there was a bus reset, block further access
3617 * to this device. If the user wants to rewind the tape,
3618 * then reset the flag and allow access again.
3619 */
3620 if (mtc.mt_op != MTREW &&
3621 mtc.mt_op != MTOFFL &&
3622 mtc.mt_op != MTRETEN &&
3623 mtc.mt_op != MTERASE &&
3624 mtc.mt_op != MTSEEK &&
3625 mtc.mt_op != MTEOM) {
3626 retval = (-EIO);
3627 goto out;
3628 }
3629 reset_state(STp);
3630 /* remove this when the midlevel properly clears was_reset */
3631 STp->device->was_reset = 0;
3632 }
3633
3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3638
3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3640 do_door_lock(STp, 0); /* Ignore result! */
3641
3642 if (mtc.mt_op == MTSETDRVBUFFER &&
3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3644 retval = st_set_options(STp, mtc.mt_count);
3645 goto out;
3646 }
3647
3648 if (mtc.mt_op == MTSETPART) {
3649 if (!STp->can_partitions ||
3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3651 retval = (-EINVAL);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions &&
3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3656 retval = (-EIO);
3657 goto out;
3658 }
3659 if (mtc.mt_count >= STp->nbr_partitions) {
3660 retval = (-EINVAL);
3661 goto out;
3662 }
3663 STp->new_partition = mtc.mt_count;
3664 retval = 0;
3665 goto out;
3666 }
3667
3668 if (mtc.mt_op == MTMKPART) {
3669 if (!STp->can_partitions) {
3670 retval = (-EINVAL);
3671 goto out;
3672 }
3673 i = do_load_unload(STp, file, 1);
3674 if (i < 0) {
3675 retval = i;
3676 goto out;
3677 }
3678 i = partition_tape(STp, mtc.mt_count);
3679 if (i < 0) {
3680 retval = i;
3681 goto out;
3682 }
3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3684 STp->ps[i].rw = ST_IDLE;
3685 STp->ps[i].at_sm = 0;
3686 STp->ps[i].last_block_valid = 0;
3687 }
3688 STp->partition = STp->new_partition = 0;
3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3690 STps->drv_block = STps->drv_file = 0;
3691 retval = 0;
3692 goto out;
3693 }
3694
3695 if (mtc.mt_op == MTSEEK) {
3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3697 if (!STp->can_partitions)
3698 STp->ps[0].rw = ST_IDLE;
3699 retval = i;
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3704 retval = do_load_unload(STp, file, 0);
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOAD) {
3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3710 goto out;
3711 }
3712
3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3715 goto out;
3716 }
3717
3718 if (STp->can_partitions && STp->ready == ST_READY &&
3719 (i = switch_partition(STp)) < 0) {
3720 retval = i;
3721 goto out;
3722 }
3723
3724 if (mtc.mt_op == MTCOMPRESSION)
3725 retval = st_compression(STp, (mtc.mt_count & 1));
3726 else
3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3728 goto out;
3729 }
3730 if (!STm->defined) {
3731 retval = (-ENXIO);
3732 goto out;
3733 }
3734
3735 if ((i = flush_buffer(STp, 0)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739 if (STp->can_partitions &&
3740 (i = switch_partition(STp)) < 0) {
3741 retval = i;
3742 goto out;
3743 }
3744
3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3746 struct mtget mt_status;
3747
3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3749 retval = (-EINVAL);
3750 goto out;
3751 }
3752
3753 mt_status.mt_type = STp->tape_type;
3754 mt_status.mt_dsreg =
3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3757 mt_status.mt_blkno = STps->drv_block;
3758 mt_status.mt_fileno = STps->drv_file;
3759 if (STp->block_size != 0) {
3760 if (STps->rw == ST_WRITING)
3761 mt_status.mt_blkno +=
3762 (STp->buffer)->buffer_bytes / STp->block_size;
3763 else if (STps->rw == ST_READING)
3764 mt_status.mt_blkno -=
3765 ((STp->buffer)->buffer_bytes +
3766 STp->block_size - 1) / STp->block_size;
3767 }
3768
3769 mt_status.mt_gstat = 0;
3770 if (STp->drv_write_prot)
3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3772 if (mt_status.mt_blkno == 0) {
3773 if (mt_status.mt_fileno == 0)
3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3775 else
3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3777 }
3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3779 mt_status.mt_resid = STp->partition;
3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3782 else if (STps->eof >= ST_EOM_OK)
3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3784 if (STp->density == 1)
3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3786 else if (STp->density == 2)
3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3788 else if (STp->density == 3)
3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3790 if (STp->ready == ST_READY)
3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3792 if (STp->ready == ST_NO_TAPE)
3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3794 if (STps->at_sm)
3795 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3796 if (STm->do_async_writes ||
3797 (STm->do_buffer_writes && STp->block_size != 0) ||
3798 STp->drv_buffer != 0)
3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3800 if (STp->cleaning_req)
3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3802
3803 retval = put_user_mtget(p, &mt_status);
3804 if (retval)
3805 goto out;
3806
3807 STp->recover_reg = 0; /* Clear after read */
3808 goto out;
3809 } /* End of MTIOCGET */
3810 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3811 struct mtpos mt_pos;
3812 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3813 retval = (-EINVAL);
3814 goto out;
3815 }
3816 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3817 retval = i;
3818 goto out;
3819 }
3820 mt_pos.mt_blkno = blk;
3821 retval = put_user_mtpos(p, &mt_pos);
3822 goto out;
3823 }
3824 mutex_unlock(&STp->lock);
3825
3826 switch (cmd_in) {
3827 case SG_IO:
3828 case SCSI_IOCTL_SEND_COMMAND:
3829 case CDROM_SEND_PACKET:
3830 if (!capable(CAP_SYS_RAWIO))
3831 return -EPERM;
3832 break;
3833 default:
3834 break;
3835 }
3836
3837 retval = scsi_ioctl(STp->device, file->f_mode & FMODE_WRITE, cmd_in, p);
3838 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
3839 /* unload */
3840 STp->rew_at_close = 0;
3841 STp->ready = ST_NO_TAPE;
3842 }
3843 return retval;
3844
3845 out:
3846 mutex_unlock(&STp->lock);
3847 return retval;
3848}
3849
3850#ifdef CONFIG_COMPAT
3851static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3852{
3853 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3854 switch (cmd_in) {
3855 case MTIOCPOS32:
3856 cmd_in = MTIOCPOS;
3857 break;
3858 case MTIOCGET32:
3859 cmd_in = MTIOCGET;
3860 break;
3861 }
3862
3863 return st_ioctl(file, cmd_in, arg);
3864}
3865#endif
3866
3867
3868
3869/* Try to allocate a new tape buffer. Calling function must not hold
3870 dev_arr_lock. */
3871static struct st_buffer *new_tape_buffer(int max_sg)
3872{
3873 struct st_buffer *tb;
3874
3875 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3876 if (!tb) {
3877 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3878 return NULL;
3879 }
3880 tb->frp_segs = 0;
3881 tb->use_sg = max_sg;
3882 tb->buffer_size = 0;
3883
3884 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3885 GFP_KERNEL);
3886 if (!tb->reserved_pages) {
3887 kfree(tb);
3888 return NULL;
3889 }
3890
3891 return tb;
3892}
3893
3894
3895/* Try to allocate enough space in the tape buffer */
3896#define ST_MAX_ORDER 6
3897
3898static int enlarge_buffer(struct st_buffer * STbuffer, int new_size)
3899{
3900 int segs, max_segs, b_size, order, got;
3901 gfp_t priority;
3902
3903 if (new_size <= STbuffer->buffer_size)
3904 return 1;
3905
3906 if (STbuffer->buffer_size <= PAGE_SIZE)
3907 normalize_buffer(STbuffer); /* Avoid extra segment */
3908
3909 max_segs = STbuffer->use_sg;
3910
3911 priority = GFP_KERNEL | __GFP_NOWARN;
3912
3913 if (STbuffer->cleared)
3914 priority |= __GFP_ZERO;
3915
3916 if (STbuffer->frp_segs) {
3917 order = STbuffer->reserved_page_order;
3918 b_size = PAGE_SIZE << order;
3919 } else {
3920 for (b_size = PAGE_SIZE, order = 0;
3921 order < ST_MAX_ORDER &&
3922 max_segs * (PAGE_SIZE << order) < new_size;
3923 order++, b_size *= 2)
3924 ; /* empty */
3925 STbuffer->reserved_page_order = order;
3926 }
3927 if (max_segs * (PAGE_SIZE << order) < new_size) {
3928 if (order == ST_MAX_ORDER)
3929 return 0;
3930 normalize_buffer(STbuffer);
3931 return enlarge_buffer(STbuffer, new_size);
3932 }
3933
3934 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3935 segs < max_segs && got < new_size;) {
3936 struct page *page;
3937
3938 page = alloc_pages(priority, order);
3939 if (!page) {
3940 DEB(STbuffer->buffer_size = got);
3941 normalize_buffer(STbuffer);
3942 return 0;
3943 }
3944
3945 STbuffer->frp_segs += 1;
3946 got += b_size;
3947 STbuffer->buffer_size = got;
3948 STbuffer->reserved_pages[segs] = page;
3949 segs++;
3950 }
3951 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3952
3953 return 1;
3954}
3955
3956
3957/* Make sure that no data from previous user is in the internal buffer */
3958static void clear_buffer(struct st_buffer * st_bp)
3959{
3960 int i;
3961
3962 for (i=0; i < st_bp->frp_segs; i++)
3963 memset(page_address(st_bp->reserved_pages[i]), 0,
3964 PAGE_SIZE << st_bp->reserved_page_order);
3965 st_bp->cleared = 1;
3966}
3967
3968
3969/* Release the extra buffer */
3970static void normalize_buffer(struct st_buffer * STbuffer)
3971{
3972 int i, order = STbuffer->reserved_page_order;
3973
3974 for (i = 0; i < STbuffer->frp_segs; i++) {
3975 __free_pages(STbuffer->reserved_pages[i], order);
3976 STbuffer->buffer_size -= (PAGE_SIZE << order);
3977 }
3978 STbuffer->frp_segs = 0;
3979 STbuffer->sg_segs = 0;
3980 STbuffer->reserved_page_order = 0;
3981 STbuffer->map_data.offset = 0;
3982}
3983
3984
3985/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3986 negative error code. */
3987static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3988{
3989 int i, cnt, res, offset;
3990 int length = PAGE_SIZE << st_bp->reserved_page_order;
3991
3992 for (i = 0, offset = st_bp->buffer_bytes;
3993 i < st_bp->frp_segs && offset >= length; i++)
3994 offset -= length;
3995 if (i == st_bp->frp_segs) { /* Should never happen */
3996 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3997 return (-EIO);
3998 }
3999 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4000 struct page *page = st_bp->reserved_pages[i];
4001 cnt = length - offset < do_count ? length - offset : do_count;
4002 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4003 if (res)
4004 return (-EFAULT);
4005 do_count -= cnt;
4006 st_bp->buffer_bytes += cnt;
4007 ubp += cnt;
4008 offset = 0;
4009 }
4010 if (do_count) /* Should never happen */
4011 return (-EIO);
4012
4013 return 0;
4014}
4015
4016
4017/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4018 negative error code. */
4019static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4020{
4021 int i, cnt, res, offset;
4022 int length = PAGE_SIZE << st_bp->reserved_page_order;
4023
4024 for (i = 0, offset = st_bp->read_pointer;
4025 i < st_bp->frp_segs && offset >= length; i++)
4026 offset -= length;
4027 if (i == st_bp->frp_segs) { /* Should never happen */
4028 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4029 return (-EIO);
4030 }
4031 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4032 struct page *page = st_bp->reserved_pages[i];
4033 cnt = length - offset < do_count ? length - offset : do_count;
4034 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4035 if (res)
4036 return (-EFAULT);
4037 do_count -= cnt;
4038 st_bp->buffer_bytes -= cnt;
4039 st_bp->read_pointer += cnt;
4040 ubp += cnt;
4041 offset = 0;
4042 }
4043 if (do_count) /* Should never happen */
4044 return (-EIO);
4045
4046 return 0;
4047}
4048
4049
4050/* Move data towards start of buffer */
4051static void move_buffer_data(struct st_buffer * st_bp, int offset)
4052{
4053 int src_seg, dst_seg, src_offset = 0, dst_offset;
4054 int count, total;
4055 int length = PAGE_SIZE << st_bp->reserved_page_order;
4056
4057 if (offset == 0)
4058 return;
4059
4060 total=st_bp->buffer_bytes - offset;
4061 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4062 src_offset = offset;
4063 if (src_offset < length)
4064 break;
4065 offset -= length;
4066 }
4067
4068 st_bp->buffer_bytes = st_bp->read_pointer = total;
4069 for (dst_seg=dst_offset=0; total > 0; ) {
4070 struct page *dpage = st_bp->reserved_pages[dst_seg];
4071 struct page *spage = st_bp->reserved_pages[src_seg];
4072
4073 count = min(length - dst_offset, length - src_offset);
4074 memmove(page_address(dpage) + dst_offset,
4075 page_address(spage) + src_offset, count);
4076 src_offset += count;
4077 if (src_offset >= length) {
4078 src_seg++;
4079 src_offset = 0;
4080 }
4081 dst_offset += count;
4082 if (dst_offset >= length) {
4083 dst_seg++;
4084 dst_offset = 0;
4085 }
4086 total -= count;
4087 }
4088}
4089
4090/* Validate the options from command line or module parameters */
4091static void validate_options(void)
4092{
4093 if (buffer_kbs > 0)
4094 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4095 if (max_sg_segs >= ST_FIRST_SG)
4096 st_max_sg_segs = max_sg_segs;
4097}
4098
4099#ifndef MODULE
4100/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4101 */
4102static int __init st_setup(char *str)
4103{
4104 int i, len, ints[5];
4105 char *stp;
4106
4107 stp = get_options(str, ARRAY_SIZE(ints), ints);
4108
4109 if (ints[0] > 0) {
4110 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4111 if (parms[i].val)
4112 *parms[i].val = ints[i + 1];
4113 } else {
4114 while (stp != NULL) {
4115 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4116 len = strlen(parms[i].name);
4117 if (!strncmp(stp, parms[i].name, len) &&
4118 (*(stp + len) == ':' || *(stp + len) == '=')) {
4119 if (parms[i].val)
4120 *parms[i].val =
4121 simple_strtoul(stp + len + 1, NULL, 0);
4122 else
4123 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4124 parms[i].name);
4125 break;
4126 }
4127 }
4128 if (i >= ARRAY_SIZE(parms))
4129 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4130 stp);
4131 stp = strchr(stp, ',');
4132 if (stp)
4133 stp++;
4134 }
4135 }
4136
4137 validate_options();
4138
4139 return 1;
4140}
4141
4142__setup("st=", st_setup);
4143
4144#endif
4145
4146static const struct file_operations st_fops =
4147{
4148 .owner = THIS_MODULE,
4149 .read = st_read,
4150 .write = st_write,
4151 .unlocked_ioctl = st_ioctl,
4152#ifdef CONFIG_COMPAT
4153 .compat_ioctl = st_compat_ioctl,
4154#endif
4155 .open = st_open,
4156 .flush = st_flush,
4157 .release = st_release,
4158 .llseek = noop_llseek,
4159};
4160
4161static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4162{
4163 int i, error;
4164 dev_t cdev_devno;
4165 struct cdev *cdev;
4166 struct device *dev;
4167 struct st_modedef *STm = &(tape->modes[mode]);
4168 char name[10];
4169 int dev_num = tape->index;
4170
4171 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4172
4173 cdev = cdev_alloc();
4174 if (!cdev) {
4175 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4176 error = -ENOMEM;
4177 goto out;
4178 }
4179 cdev->owner = THIS_MODULE;
4180 cdev->ops = &st_fops;
4181 STm->cdevs[rew] = cdev;
4182
4183 error = cdev_add(cdev, cdev_devno, 1);
4184 if (error) {
4185 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4186 rew ? "non" : "auto", mode);
4187 pr_err("st%d: Device not attached.\n", dev_num);
4188 goto out_free;
4189 }
4190
4191 i = mode << (4 - ST_NBR_MODE_BITS);
4192 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4193 tape->name, st_formats[i]);
4194
4195 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4196 cdev_devno, &tape->modes[mode], "%s", name);
4197 if (IS_ERR(dev)) {
4198 pr_err("st%d: device_create failed\n", dev_num);
4199 error = PTR_ERR(dev);
4200 goto out_free;
4201 }
4202
4203 STm->devs[rew] = dev;
4204
4205 return 0;
4206out_free:
4207 cdev_del(STm->cdevs[rew]);
4208out:
4209 STm->cdevs[rew] = NULL;
4210 STm->devs[rew] = NULL;
4211 return error;
4212}
4213
4214static int create_cdevs(struct scsi_tape *tape)
4215{
4216 int mode, error;
4217 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4218 error = create_one_cdev(tape, mode, 0);
4219 if (error)
4220 return error;
4221 error = create_one_cdev(tape, mode, 1);
4222 if (error)
4223 return error;
4224 }
4225
4226 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4227 &tape->modes[0].devs[0]->kobj, "tape");
4228}
4229
4230static void remove_cdevs(struct scsi_tape *tape)
4231{
4232 int mode, rew;
4233 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4234 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4235 struct st_modedef *STm = &(tape->modes[mode]);
4236 for (rew = 0; rew < 2; rew++) {
4237 if (STm->cdevs[rew])
4238 cdev_del(STm->cdevs[rew]);
4239 if (STm->devs[rew])
4240 device_unregister(STm->devs[rew]);
4241 }
4242 }
4243}
4244
4245static int st_probe(struct device *dev)
4246{
4247 struct scsi_device *SDp = to_scsi_device(dev);
4248 struct scsi_tape *tpnt = NULL;
4249 struct st_modedef *STm;
4250 struct st_partstat *STps;
4251 struct st_buffer *buffer;
4252 int i, error;
4253
4254 if (SDp->type != TYPE_TAPE)
4255 return -ENODEV;
4256 if (st_incompatible(SDp)) {
4257 sdev_printk(KERN_INFO, SDp,
4258 "OnStream tapes are no longer supported;\n");
4259 sdev_printk(KERN_INFO, SDp,
4260 "please mail to linux-scsi@vger.kernel.org.\n");
4261 return -ENODEV;
4262 }
4263
4264 scsi_autopm_get_device(SDp);
4265 i = queue_max_segments(SDp->request_queue);
4266 if (st_max_sg_segs < i)
4267 i = st_max_sg_segs;
4268 buffer = new_tape_buffer(i);
4269 if (buffer == NULL) {
4270 sdev_printk(KERN_ERR, SDp,
4271 "st: Can't allocate new tape buffer. "
4272 "Device not attached.\n");
4273 goto out;
4274 }
4275
4276 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4277 if (tpnt == NULL) {
4278 sdev_printk(KERN_ERR, SDp,
4279 "st: Can't allocate device descriptor.\n");
4280 goto out_buffer_free;
4281 }
4282 kref_init(&tpnt->kref);
4283
4284 tpnt->device = SDp;
4285 if (SDp->scsi_level <= 2)
4286 tpnt->tape_type = MT_ISSCSI1;
4287 else
4288 tpnt->tape_type = MT_ISSCSI2;
4289
4290 tpnt->buffer = buffer;
4291 tpnt->buffer->last_SRpnt = NULL;
4292
4293 tpnt->inited = 0;
4294 tpnt->dirty = 0;
4295 tpnt->in_use = 0;
4296 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4297 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4298 tpnt->density = 0;
4299 tpnt->do_auto_lock = ST_AUTO_LOCK;
4300 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4301 tpnt->can_partitions = 0;
4302 tpnt->two_fm = ST_TWO_FM;
4303 tpnt->fast_mteom = ST_FAST_MTEOM;
4304 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4305 tpnt->sili = ST_SILI;
4306 tpnt->immediate = ST_NOWAIT;
4307 tpnt->immediate_filemark = 0;
4308 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4309 tpnt->partition = 0;
4310 tpnt->new_partition = 0;
4311 tpnt->nbr_partitions = 0;
4312 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4313 tpnt->long_timeout = ST_LONG_TIMEOUT;
4314 tpnt->try_dio = try_direct_io;
4315
4316 for (i = 0; i < ST_NBR_MODES; i++) {
4317 STm = &(tpnt->modes[i]);
4318 STm->defined = 0;
4319 STm->sysv = ST_SYSV;
4320 STm->defaults_for_writes = 0;
4321 STm->do_async_writes = ST_ASYNC_WRITES;
4322 STm->do_buffer_writes = ST_BUFFER_WRITES;
4323 STm->do_read_ahead = ST_READ_AHEAD;
4324 STm->default_compression = ST_DONT_TOUCH;
4325 STm->default_blksize = (-1); /* No forced size */
4326 STm->default_density = (-1); /* No forced density */
4327 STm->tape = tpnt;
4328 }
4329
4330 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4331 STps = &(tpnt->ps[i]);
4332 STps->rw = ST_IDLE;
4333 STps->eof = ST_NOEOF;
4334 STps->at_sm = 0;
4335 STps->last_block_valid = 0;
4336 STps->drv_block = (-1);
4337 STps->drv_file = (-1);
4338 }
4339
4340 tpnt->current_mode = 0;
4341 tpnt->modes[0].defined = 1;
4342
4343 tpnt->density_changed = tpnt->compression_changed =
4344 tpnt->blksize_changed = 0;
4345 mutex_init(&tpnt->lock);
4346
4347 idr_preload(GFP_KERNEL);
4348 spin_lock(&st_index_lock);
4349 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4350 spin_unlock(&st_index_lock);
4351 idr_preload_end();
4352 if (error < 0) {
4353 pr_warn("st: idr allocation failed: %d\n", error);
4354 goto out_free_tape;
4355 }
4356 tpnt->index = error;
4357 sprintf(tpnt->name, "st%d", tpnt->index);
4358 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4359 if (tpnt->stats == NULL) {
4360 sdev_printk(KERN_ERR, SDp,
4361 "st: Can't allocate statistics.\n");
4362 goto out_idr_remove;
4363 }
4364
4365 dev_set_drvdata(dev, tpnt);
4366
4367
4368 error = create_cdevs(tpnt);
4369 if (error)
4370 goto out_remove_devs;
4371 scsi_autopm_put_device(SDp);
4372
4373 sdev_printk(KERN_NOTICE, SDp,
4374 "Attached scsi tape %s\n", tpnt->name);
4375 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4376 tpnt->name, tpnt->try_dio ? "yes" : "no",
4377 queue_dma_alignment(SDp->request_queue) + 1);
4378
4379 return 0;
4380
4381out_remove_devs:
4382 remove_cdevs(tpnt);
4383 kfree(tpnt->stats);
4384out_idr_remove:
4385 spin_lock(&st_index_lock);
4386 idr_remove(&st_index_idr, tpnt->index);
4387 spin_unlock(&st_index_lock);
4388out_free_tape:
4389 kfree(tpnt);
4390out_buffer_free:
4391 kfree(buffer);
4392out:
4393 scsi_autopm_put_device(SDp);
4394 return -ENODEV;
4395};
4396
4397
4398static int st_remove(struct device *dev)
4399{
4400 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4401 int index = tpnt->index;
4402
4403 scsi_autopm_get_device(to_scsi_device(dev));
4404 remove_cdevs(tpnt);
4405
4406 mutex_lock(&st_ref_mutex);
4407 kref_put(&tpnt->kref, scsi_tape_release);
4408 mutex_unlock(&st_ref_mutex);
4409 spin_lock(&st_index_lock);
4410 idr_remove(&st_index_idr, index);
4411 spin_unlock(&st_index_lock);
4412 return 0;
4413}
4414
4415/**
4416 * scsi_tape_release - Called to free the Scsi_Tape structure
4417 * @kref: pointer to embedded kref
4418 *
4419 * st_ref_mutex must be held entering this routine. Because it is
4420 * called on last put, you should always use the scsi_tape_get()
4421 * scsi_tape_put() helpers which manipulate the semaphore directly
4422 * and never do a direct kref_put().
4423 **/
4424static void scsi_tape_release(struct kref *kref)
4425{
4426 struct scsi_tape *tpnt = to_scsi_tape(kref);
4427
4428 tpnt->device = NULL;
4429
4430 if (tpnt->buffer) {
4431 normalize_buffer(tpnt->buffer);
4432 kfree(tpnt->buffer->reserved_pages);
4433 kfree(tpnt->buffer);
4434 }
4435
4436 kfree(tpnt->stats);
4437 kfree(tpnt);
4438 return;
4439}
4440
4441static struct class st_sysfs_class = {
4442 .name = "scsi_tape",
4443 .dev_groups = st_dev_groups,
4444};
4445
4446static int __init init_st(void)
4447{
4448 int err;
4449
4450 validate_options();
4451
4452 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4453 verstr, st_fixed_buffer_size, st_max_sg_segs);
4454
4455 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4456 if (debugging) {
4457 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4458 debugging);
4459 }
4460
4461 err = class_register(&st_sysfs_class);
4462 if (err) {
4463 pr_err("Unable register sysfs class for SCSI tapes\n");
4464 return err;
4465 }
4466
4467 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4468 ST_MAX_TAPE_ENTRIES, "st");
4469 if (err) {
4470 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4471 SCSI_TAPE_MAJOR);
4472 goto err_class;
4473 }
4474
4475 err = scsi_register_driver(&st_template.gendrv);
4476 if (err)
4477 goto err_chrdev;
4478
4479 return 0;
4480
4481err_chrdev:
4482 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4483 ST_MAX_TAPE_ENTRIES);
4484err_class:
4485 class_unregister(&st_sysfs_class);
4486 return err;
4487}
4488
4489static void __exit exit_st(void)
4490{
4491 scsi_unregister_driver(&st_template.gendrv);
4492 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4493 ST_MAX_TAPE_ENTRIES);
4494 class_unregister(&st_sysfs_class);
4495 idr_destroy(&st_index_idr);
4496 printk(KERN_INFO "st: Unloaded.\n");
4497}
4498
4499module_init(init_st);
4500module_exit(exit_st);
4501
4502
4503/* The sysfs driver interface. Read-only at the moment */
4504static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4505{
4506 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4507}
4508static DRIVER_ATTR_RO(try_direct_io);
4509
4510static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4511{
4512 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4513}
4514static DRIVER_ATTR_RO(fixed_buffer_size);
4515
4516static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4517{
4518 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4519}
4520static DRIVER_ATTR_RO(max_sg_segs);
4521
4522static ssize_t version_show(struct device_driver *ddd, char *buf)
4523{
4524 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4525}
4526static DRIVER_ATTR_RO(version);
4527
4528#if DEBUG
4529static ssize_t debug_flag_store(struct device_driver *ddp,
4530 const char *buf, size_t count)
4531{
4532/* We only care what the first byte of the data is the rest is unused.
4533 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4534 * other values have -EINVAL returned if they are passed in.
4535 */
4536 if (count > 0) {
4537 if (buf[0] == '0') {
4538 debugging = NO_DEBUG;
4539 return count;
4540 } else if (buf[0] == '1') {
4541 debugging = 1;
4542 return count;
4543 }
4544 }
4545 return -EINVAL;
4546}
4547
4548static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4549{
4550 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4551}
4552static DRIVER_ATTR_RW(debug_flag);
4553#endif
4554
4555static struct attribute *st_drv_attrs[] = {
4556 &driver_attr_try_direct_io.attr,
4557 &driver_attr_fixed_buffer_size.attr,
4558 &driver_attr_max_sg_segs.attr,
4559 &driver_attr_version.attr,
4560#if DEBUG
4561 &driver_attr_debug_flag.attr,
4562#endif
4563 NULL,
4564};
4565ATTRIBUTE_GROUPS(st_drv);
4566
4567/* The sysfs simple class interface */
4568static ssize_t
4569defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4570{
4571 struct st_modedef *STm = dev_get_drvdata(dev);
4572 ssize_t l = 0;
4573
4574 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4575 return l;
4576}
4577static DEVICE_ATTR_RO(defined);
4578
4579static ssize_t
4580default_blksize_show(struct device *dev, struct device_attribute *attr,
4581 char *buf)
4582{
4583 struct st_modedef *STm = dev_get_drvdata(dev);
4584 ssize_t l = 0;
4585
4586 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4587 return l;
4588}
4589static DEVICE_ATTR_RO(default_blksize);
4590
4591static ssize_t
4592default_density_show(struct device *dev, struct device_attribute *attr,
4593 char *buf)
4594{
4595 struct st_modedef *STm = dev_get_drvdata(dev);
4596 ssize_t l = 0;
4597 char *fmt;
4598
4599 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4600 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4601 return l;
4602}
4603static DEVICE_ATTR_RO(default_density);
4604
4605static ssize_t
4606default_compression_show(struct device *dev, struct device_attribute *attr,
4607 char *buf)
4608{
4609 struct st_modedef *STm = dev_get_drvdata(dev);
4610 ssize_t l = 0;
4611
4612 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4613 return l;
4614}
4615static DEVICE_ATTR_RO(default_compression);
4616
4617static ssize_t
4618options_show(struct device *dev, struct device_attribute *attr, char *buf)
4619{
4620 struct st_modedef *STm = dev_get_drvdata(dev);
4621 struct scsi_tape *STp = STm->tape;
4622 int options;
4623 ssize_t l = 0;
4624
4625 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4626 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4627 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4628 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4629 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4630 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4631 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4632 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4633 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4634 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4635 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4636 options |= STm->sysv ? MT_ST_SYSV : 0;
4637 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4638 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4639 options |= STp->sili ? MT_ST_SILI : 0;
4640
4641 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4642 return l;
4643}
4644static DEVICE_ATTR_RO(options);
4645
4646/* Support for tape stats */
4647
4648/**
4649 * read_cnt_show - return read count - count of reads made from tape drive
4650 * @dev: struct device
4651 * @attr: attribute structure
4652 * @buf: buffer to return formatted data in
4653 */
4654static ssize_t read_cnt_show(struct device *dev,
4655 struct device_attribute *attr, char *buf)
4656{
4657 struct st_modedef *STm = dev_get_drvdata(dev);
4658
4659 return sprintf(buf, "%lld",
4660 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4661}
4662static DEVICE_ATTR_RO(read_cnt);
4663
4664/**
4665 * read_byte_cnt_show - return read byte count - tape drives
4666 * may use blocks less than 512 bytes this gives the raw byte count of
4667 * of data read from the tape drive.
4668 * @dev: struct device
4669 * @attr: attribute structure
4670 * @buf: buffer to return formatted data in
4671 */
4672static ssize_t read_byte_cnt_show(struct device *dev,
4673 struct device_attribute *attr, char *buf)
4674{
4675 struct st_modedef *STm = dev_get_drvdata(dev);
4676
4677 return sprintf(buf, "%lld",
4678 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4679}
4680static DEVICE_ATTR_RO(read_byte_cnt);
4681
4682/**
4683 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4684 * @dev: struct device
4685 * @attr: attribute structure
4686 * @buf: buffer to return formatted data in
4687 */
4688static ssize_t read_ns_show(struct device *dev,
4689 struct device_attribute *attr, char *buf)
4690{
4691 struct st_modedef *STm = dev_get_drvdata(dev);
4692
4693 return sprintf(buf, "%lld",
4694 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4695}
4696static DEVICE_ATTR_RO(read_ns);
4697
4698/**
4699 * write_cnt_show - write count - number of user calls
4700 * to write(2) that have written data to tape.
4701 * @dev: struct device
4702 * @attr: attribute structure
4703 * @buf: buffer to return formatted data in
4704 */
4705static ssize_t write_cnt_show(struct device *dev,
4706 struct device_attribute *attr, char *buf)
4707{
4708 struct st_modedef *STm = dev_get_drvdata(dev);
4709
4710 return sprintf(buf, "%lld",
4711 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4712}
4713static DEVICE_ATTR_RO(write_cnt);
4714
4715/**
4716 * write_byte_cnt_show - write byte count - raw count of
4717 * bytes written to tape.
4718 * @dev: struct device
4719 * @attr: attribute structure
4720 * @buf: buffer to return formatted data in
4721 */
4722static ssize_t write_byte_cnt_show(struct device *dev,
4723 struct device_attribute *attr, char *buf)
4724{
4725 struct st_modedef *STm = dev_get_drvdata(dev);
4726
4727 return sprintf(buf, "%lld",
4728 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4729}
4730static DEVICE_ATTR_RO(write_byte_cnt);
4731
4732/**
4733 * write_ns_show - write ns - number of nanoseconds waiting on write
4734 * requests to complete.
4735 * @dev: struct device
4736 * @attr: attribute structure
4737 * @buf: buffer to return formatted data in
4738 */
4739static ssize_t write_ns_show(struct device *dev,
4740 struct device_attribute *attr, char *buf)
4741{
4742 struct st_modedef *STm = dev_get_drvdata(dev);
4743
4744 return sprintf(buf, "%lld",
4745 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4746}
4747static DEVICE_ATTR_RO(write_ns);
4748
4749/**
4750 * in_flight_show - number of I/Os currently in flight -
4751 * in most cases this will be either 0 or 1. It may be higher if someone
4752 * has also issued other SCSI commands such as via an ioctl.
4753 * @dev: struct device
4754 * @attr: attribute structure
4755 * @buf: buffer to return formatted data in
4756 */
4757static ssize_t in_flight_show(struct device *dev,
4758 struct device_attribute *attr, char *buf)
4759{
4760 struct st_modedef *STm = dev_get_drvdata(dev);
4761
4762 return sprintf(buf, "%lld",
4763 (long long)atomic64_read(&STm->tape->stats->in_flight));
4764}
4765static DEVICE_ATTR_RO(in_flight);
4766
4767/**
4768 * io_ns_show - io wait ns - this is the number of ns spent
4769 * waiting on all I/O to complete. This includes tape movement commands
4770 * such as rewinding, seeking to end of file or tape, it also includes
4771 * read and write. To determine the time spent on tape movement
4772 * subtract the read and write ns from this value.
4773 * @dev: struct device
4774 * @attr: attribute structure
4775 * @buf: buffer to return formatted data in
4776 */
4777static ssize_t io_ns_show(struct device *dev,
4778 struct device_attribute *attr, char *buf)
4779{
4780 struct st_modedef *STm = dev_get_drvdata(dev);
4781
4782 return sprintf(buf, "%lld",
4783 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4784}
4785static DEVICE_ATTR_RO(io_ns);
4786
4787/**
4788 * other_cnt_show - other io count - this is the number of
4789 * I/O requests other than read and write requests.
4790 * Typically these are tape movement requests but will include driver
4791 * tape movement. This includes only requests issued by the st driver.
4792 * @dev: struct device
4793 * @attr: attribute structure
4794 * @buf: buffer to return formatted data in
4795 */
4796static ssize_t other_cnt_show(struct device *dev,
4797 struct device_attribute *attr, char *buf)
4798{
4799 struct st_modedef *STm = dev_get_drvdata(dev);
4800
4801 return sprintf(buf, "%lld",
4802 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4803}
4804static DEVICE_ATTR_RO(other_cnt);
4805
4806/**
4807 * resid_cnt_show - A count of the number of times we get a residual
4808 * count - this should indicate someone issuing reads larger than the
4809 * block size on tape.
4810 * @dev: struct device
4811 * @attr: attribute structure
4812 * @buf: buffer to return formatted data in
4813 */
4814static ssize_t resid_cnt_show(struct device *dev,
4815 struct device_attribute *attr, char *buf)
4816{
4817 struct st_modedef *STm = dev_get_drvdata(dev);
4818
4819 return sprintf(buf, "%lld",
4820 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4821}
4822static DEVICE_ATTR_RO(resid_cnt);
4823
4824static struct attribute *st_dev_attrs[] = {
4825 &dev_attr_defined.attr,
4826 &dev_attr_default_blksize.attr,
4827 &dev_attr_default_density.attr,
4828 &dev_attr_default_compression.attr,
4829 &dev_attr_options.attr,
4830 NULL,
4831};
4832
4833static struct attribute *st_stats_attrs[] = {
4834 &dev_attr_read_cnt.attr,
4835 &dev_attr_read_byte_cnt.attr,
4836 &dev_attr_read_ns.attr,
4837 &dev_attr_write_cnt.attr,
4838 &dev_attr_write_byte_cnt.attr,
4839 &dev_attr_write_ns.attr,
4840 &dev_attr_in_flight.attr,
4841 &dev_attr_io_ns.attr,
4842 &dev_attr_other_cnt.attr,
4843 &dev_attr_resid_cnt.attr,
4844 NULL,
4845};
4846
4847static struct attribute_group stats_group = {
4848 .name = "stats",
4849 .attrs = st_stats_attrs,
4850};
4851
4852static struct attribute_group st_group = {
4853 .attrs = st_dev_attrs,
4854};
4855
4856static const struct attribute_group *st_dev_groups[] = {
4857 &st_group,
4858 &stats_group,
4859 NULL,
4860};
4861
4862/* The following functions may be useful for a larger audience. */
4863static int sgl_map_user_pages(struct st_buffer *STbp,
4864 const unsigned int max_pages, unsigned long uaddr,
4865 size_t count, int rw)
4866{
4867 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4868 unsigned long start = uaddr >> PAGE_SHIFT;
4869 const int nr_pages = end - start;
4870 int res, i;
4871 struct page **pages;
4872 struct rq_map_data *mdata = &STbp->map_data;
4873
4874 /* User attempted Overflow! */
4875 if ((uaddr + count) < uaddr)
4876 return -EINVAL;
4877
4878 /* Too big */
4879 if (nr_pages > max_pages)
4880 return -ENOMEM;
4881
4882 /* Hmm? */
4883 if (count == 0)
4884 return 0;
4885
4886 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4887 if (pages == NULL)
4888 return -ENOMEM;
4889
4890 /* Try to fault in all of the necessary pages */
4891 /* rw==READ means read from drive, write into memory area */
4892 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4893 pages);
4894
4895 /* Errors and no page mapped should return here */
4896 if (res < nr_pages)
4897 goto out_unmap;
4898
4899 for (i=0; i < nr_pages; i++) {
4900 /* FIXME: flush superflous for rw==READ,
4901 * probably wrong function for rw==WRITE
4902 */
4903 flush_dcache_page(pages[i]);
4904 }
4905
4906 mdata->offset = uaddr & ~PAGE_MASK;
4907 STbp->mapped_pages = pages;
4908
4909 return nr_pages;
4910 out_unmap:
4911 if (res > 0) {
4912 unpin_user_pages(pages, res);
4913 res = 0;
4914 }
4915 kfree(pages);
4916 return res;
4917}
4918
4919
4920/* And unmap them... */
4921static int sgl_unmap_user_pages(struct st_buffer *STbp,
4922 const unsigned int nr_pages, int dirtied)
4923{
4924 /* FIXME: cache flush missing for rw==READ */
4925 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);
4926
4927 kfree(STbp->mapped_pages);
4928 STbp->mapped_pages = NULL;
4929
4930 return 0;
4931}
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}