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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 - 2010 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 = "20101219";
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 0
60
61#if DEBUG
62/* The message level for the debug messages is currently set to KERN_NOTICE
63 so that people can easily see the messages. Later when the debugging messages
64 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
65#define ST_DEB_MSG KERN_NOTICE
66#define DEB(a) a
67#define DEBC(a) if (debugging) { a ; }
68#else
69#define DEB(a)
70#define DEBC(a)
71#endif
72
73#define ST_KILOBYTE 1024
74
75#include "st_options.h"
76#include "st.h"
77
78static int buffer_kbs;
79static int max_sg_segs;
80static int try_direct_io = TRY_DIRECT_IO;
81static int try_rdio = 1;
82static int try_wdio = 1;
83
84static struct class st_sysfs_class;
85static const struct attribute_group *st_dev_groups[];
86
87MODULE_AUTHOR("Kai Makisara");
88MODULE_DESCRIPTION("SCSI tape (st) driver");
89MODULE_LICENSE("GPL");
90MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
91MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
92
93/* Set 'perm' (4th argument) to 0 to disable module_param's definition
94 * of sysfs parameters (which module_param doesn't yet support).
95 * Sysfs parameters defined explicitly later.
96 */
97module_param_named(buffer_kbs, buffer_kbs, int, 0);
98MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
99module_param_named(max_sg_segs, max_sg_segs, int, 0);
100MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
101module_param_named(try_direct_io, try_direct_io, int, 0);
102MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
103
104/* Extra parameters for testing */
105module_param_named(try_rdio, try_rdio, int, 0);
106MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
107module_param_named(try_wdio, try_wdio, int, 0);
108MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
109
110#ifndef MODULE
111static int write_threshold_kbs; /* retained for compatibility */
112static struct st_dev_parm {
113 char *name;
114 int *val;
115} parms[] __initdata = {
116 {
117 "buffer_kbs", &buffer_kbs
118 },
119 { /* Retained for compatibility with 2.4 */
120 "write_threshold_kbs", &write_threshold_kbs
121 },
122 {
123 "max_sg_segs", NULL
124 },
125 {
126 "try_direct_io", &try_direct_io
127 }
128};
129#endif
130
131/* Restrict the number of modes so that names for all are assigned */
132#if ST_NBR_MODES > 16
133#error "Maximum number of modes is 16"
134#endif
135/* Bit reversed order to get same names for same minors with all
136 mode counts */
137static const char *st_formats[] = {
138 "", "r", "k", "s", "l", "t", "o", "u",
139 "m", "v", "p", "x", "a", "y", "q", "z"};
140
141/* The default definitions have been moved to st_options.h */
142
143#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
144
145/* The buffer size should fit into the 24 bits for length in the
146 6-byte SCSI read and write commands. */
147#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
148#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
149#endif
150
151static int debugging = DEBUG;
152
153#define MAX_RETRIES 0
154#define MAX_WRITE_RETRIES 0
155#define MAX_READY_RETRIES 0
156#define NO_TAPE NOT_READY
157
158#define ST_TIMEOUT (900 * HZ)
159#define ST_LONG_TIMEOUT (14000 * HZ)
160
161/* Remove mode bits and auto-rewind bit (7) */
162#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
163 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
164#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
165
166/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
167#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
168 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
169
170/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
171 24 bits) */
172#define SET_DENS_AND_BLK 0x10001
173
174static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
175static int st_max_sg_segs = ST_MAX_SG;
176
177static int modes_defined;
178
179static int enlarge_buffer(struct st_buffer *, int, int);
180static void clear_buffer(struct st_buffer *);
181static void normalize_buffer(struct st_buffer *);
182static int append_to_buffer(const char __user *, struct st_buffer *, int);
183static int from_buffer(struct st_buffer *, char __user *, int);
184static void move_buffer_data(struct st_buffer *, int);
185
186static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
187 unsigned long, size_t, int);
188static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
189
190static int st_probe(struct device *);
191static int st_remove(struct device *);
192
193static int do_create_sysfs_files(void);
194static void do_remove_sysfs_files(void);
195
196static struct scsi_driver st_template = {
197 .owner = THIS_MODULE,
198 .gendrv = {
199 .name = "st",
200 .probe = st_probe,
201 .remove = st_remove,
202 },
203};
204
205static int st_compression(struct scsi_tape *, int);
206
207static int find_partition(struct scsi_tape *);
208static int switch_partition(struct scsi_tape *);
209
210static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
211
212static void scsi_tape_release(struct kref *);
213
214#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
215
216static DEFINE_MUTEX(st_ref_mutex);
217static DEFINE_SPINLOCK(st_index_lock);
218static DEFINE_SPINLOCK(st_use_lock);
219static DEFINE_IDR(st_index_idr);
220
221
222
223#include "osst_detect.h"
224#ifndef SIGS_FROM_OSST
225#define SIGS_FROM_OSST \
226 {"OnStream", "SC-", "", "osst"}, \
227 {"OnStream", "DI-", "", "osst"}, \
228 {"OnStream", "DP-", "", "osst"}, \
229 {"OnStream", "USB", "", "osst"}, \
230 {"OnStream", "FW-", "", "osst"}
231#endif
232
233static struct scsi_tape *scsi_tape_get(int dev)
234{
235 struct scsi_tape *STp = NULL;
236
237 mutex_lock(&st_ref_mutex);
238 spin_lock(&st_index_lock);
239
240 STp = idr_find(&st_index_idr, dev);
241 if (!STp) goto out;
242
243 kref_get(&STp->kref);
244
245 if (!STp->device)
246 goto out_put;
247
248 if (scsi_device_get(STp->device))
249 goto out_put;
250
251 goto out;
252
253out_put:
254 kref_put(&STp->kref, scsi_tape_release);
255 STp = NULL;
256out:
257 spin_unlock(&st_index_lock);
258 mutex_unlock(&st_ref_mutex);
259 return STp;
260}
261
262static void scsi_tape_put(struct scsi_tape *STp)
263{
264 struct scsi_device *sdev = STp->device;
265
266 mutex_lock(&st_ref_mutex);
267 kref_put(&STp->kref, scsi_tape_release);
268 scsi_device_put(sdev);
269 mutex_unlock(&st_ref_mutex);
270}
271
272struct st_reject_data {
273 char *vendor;
274 char *model;
275 char *rev;
276 char *driver_hint; /* Name of the correct driver, NULL if unknown */
277};
278
279static struct st_reject_data reject_list[] = {
280 /* {"XXX", "Yy-", "", NULL}, example */
281 SIGS_FROM_OSST,
282 {NULL, }};
283
284/* If the device signature is on the list of incompatible drives, the
285 function returns a pointer to the name of the correct driver (if known) */
286static char * st_incompatible(struct scsi_device* SDp)
287{
288 struct st_reject_data *rp;
289
290 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
291 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
292 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
293 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
294 if (rp->driver_hint)
295 return rp->driver_hint;
296 else
297 return "unknown";
298 }
299 return NULL;
300}
301
302
303static inline char *tape_name(struct scsi_tape *tape)
304{
305 return tape->disk->disk_name;
306}
307
308
309static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
310{
311 const u8 *ucp;
312 const u8 *sense = SRpnt->sense;
313
314 s->have_sense = scsi_normalize_sense(SRpnt->sense,
315 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
316 s->flags = 0;
317
318 if (s->have_sense) {
319 s->deferred = 0;
320 s->remainder_valid =
321 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
322 switch (sense[0] & 0x7f) {
323 case 0x71:
324 s->deferred = 1;
325 case 0x70:
326 s->fixed_format = 1;
327 s->flags = sense[2] & 0xe0;
328 break;
329 case 0x73:
330 s->deferred = 1;
331 case 0x72:
332 s->fixed_format = 0;
333 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
334 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
335 break;
336 }
337 }
338}
339
340
341/* Convert the result to success code */
342static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
343{
344 int result = SRpnt->result;
345 u8 scode;
346 DEB(const char *stp;)
347 char *name = tape_name(STp);
348 struct st_cmdstatus *cmdstatp;
349
350 if (!result)
351 return 0;
352
353 cmdstatp = &STp->buffer->cmdstat;
354 st_analyze_sense(SRpnt, cmdstatp);
355
356 if (cmdstatp->have_sense)
357 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
358 else
359 scode = 0;
360
361 DEB(
362 if (debugging) {
363 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
364 name, result,
365 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
366 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
367 if (cmdstatp->have_sense)
368 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
369 } ) /* end DEB */
370 if (!debugging) { /* Abnormal conditions for tape */
371 if (!cmdstatp->have_sense)
372 printk(KERN_WARNING
373 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
374 name, result, driver_byte(result),
375 host_byte(result));
376 else if (cmdstatp->have_sense &&
377 scode != NO_SENSE &&
378 scode != RECOVERED_ERROR &&
379 /* scode != UNIT_ATTENTION && */
380 scode != BLANK_CHECK &&
381 scode != VOLUME_OVERFLOW &&
382 SRpnt->cmd[0] != MODE_SENSE &&
383 SRpnt->cmd[0] != TEST_UNIT_READY) {
384
385 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
386 }
387 }
388
389 if (cmdstatp->fixed_format &&
390 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
391 if (STp->cln_sense_value)
392 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
393 STp->cln_sense_mask) == STp->cln_sense_value);
394 else
395 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
396 STp->cln_sense_mask) != 0);
397 }
398 if (cmdstatp->have_sense &&
399 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
400 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
401
402 STp->pos_unknown |= STp->device->was_reset;
403
404 if (cmdstatp->have_sense &&
405 scode == RECOVERED_ERROR
406#if ST_RECOVERED_WRITE_FATAL
407 && SRpnt->cmd[0] != WRITE_6
408 && SRpnt->cmd[0] != WRITE_FILEMARKS
409#endif
410 ) {
411 STp->recover_count++;
412 STp->recover_reg++;
413
414 DEB(
415 if (debugging) {
416 if (SRpnt->cmd[0] == READ_6)
417 stp = "read";
418 else if (SRpnt->cmd[0] == WRITE_6)
419 stp = "write";
420 else
421 stp = "ioctl";
422 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
423 STp->recover_count);
424 } ) /* end DEB */
425
426 if (cmdstatp->flags == 0)
427 return 0;
428 }
429 return (-EIO);
430}
431
432static struct st_request *st_allocate_request(struct scsi_tape *stp)
433{
434 struct st_request *streq;
435
436 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
437 if (streq)
438 streq->stp = stp;
439 else {
440 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
441 tape_name(stp)););
442 if (signal_pending(current))
443 stp->buffer->syscall_result = -EINTR;
444 else
445 stp->buffer->syscall_result = -EBUSY;
446 }
447
448 return streq;
449}
450
451static void st_release_request(struct st_request *streq)
452{
453 kfree(streq);
454}
455
456static void st_scsi_execute_end(struct request *req, int uptodate)
457{
458 struct st_request *SRpnt = req->end_io_data;
459 struct scsi_tape *STp = SRpnt->stp;
460 struct bio *tmp;
461
462 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
463 STp->buffer->cmdstat.residual = req->resid_len;
464
465 tmp = SRpnt->bio;
466 if (SRpnt->waiting)
467 complete(SRpnt->waiting);
468
469 blk_rq_unmap_user(tmp);
470 __blk_put_request(req->q, req);
471}
472
473static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
474 int data_direction, void *buffer, unsigned bufflen,
475 int timeout, int retries)
476{
477 struct request *req;
478 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
479 int err = 0;
480 int write = (data_direction == DMA_TO_DEVICE);
481
482 req = blk_get_request(SRpnt->stp->device->request_queue, write,
483 GFP_KERNEL);
484 if (!req)
485 return DRIVER_ERROR << 24;
486
487 req->cmd_type = REQ_TYPE_BLOCK_PC;
488 req->cmd_flags |= REQ_QUIET;
489
490 mdata->null_mapped = 1;
491
492 if (bufflen) {
493 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
494 GFP_KERNEL);
495 if (err) {
496 blk_put_request(req);
497 return DRIVER_ERROR << 24;
498 }
499 }
500
501 SRpnt->bio = req->bio;
502 req->cmd_len = COMMAND_SIZE(cmd[0]);
503 memset(req->cmd, 0, BLK_MAX_CDB);
504 memcpy(req->cmd, cmd, req->cmd_len);
505 req->sense = SRpnt->sense;
506 req->sense_len = 0;
507 req->timeout = timeout;
508 req->retries = retries;
509 req->end_io_data = SRpnt;
510
511 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
512 return 0;
513}
514
515/* Do the scsi command. Waits until command performed if do_wait is true.
516 Otherwise write_behind_check() is used to check that the command
517 has finished. */
518static struct st_request *
519st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
520 int bytes, int direction, int timeout, int retries, int do_wait)
521{
522 struct completion *waiting;
523 struct rq_map_data *mdata = &STp->buffer->map_data;
524 int ret;
525
526 /* if async, make sure there's no command outstanding */
527 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
528 printk(KERN_ERR "%s: Async command already active.\n",
529 tape_name(STp));
530 if (signal_pending(current))
531 (STp->buffer)->syscall_result = (-EINTR);
532 else
533 (STp->buffer)->syscall_result = (-EBUSY);
534 return NULL;
535 }
536
537 if (!SRpnt) {
538 SRpnt = st_allocate_request(STp);
539 if (!SRpnt)
540 return NULL;
541 }
542
543 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
544 which IO is outstanding. It's nulled out when the IO completes. */
545 if (!do_wait)
546 (STp->buffer)->last_SRpnt = SRpnt;
547
548 waiting = &STp->wait;
549 init_completion(waiting);
550 SRpnt->waiting = waiting;
551
552 if (STp->buffer->do_dio) {
553 mdata->page_order = 0;
554 mdata->nr_entries = STp->buffer->sg_segs;
555 mdata->pages = STp->buffer->mapped_pages;
556 } else {
557 mdata->page_order = STp->buffer->reserved_page_order;
558 mdata->nr_entries =
559 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
560 mdata->pages = STp->buffer->reserved_pages;
561 mdata->offset = 0;
562 }
563
564 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
565 STp->buffer->cmdstat.have_sense = 0;
566 STp->buffer->syscall_result = 0;
567
568 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
569 retries);
570 if (ret) {
571 /* could not allocate the buffer or request was too large */
572 (STp->buffer)->syscall_result = (-EBUSY);
573 (STp->buffer)->last_SRpnt = NULL;
574 } else if (do_wait) {
575 wait_for_completion(waiting);
576 SRpnt->waiting = NULL;
577 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
578 }
579
580 return SRpnt;
581}
582
583
584/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
585 write has been correct but EOM early warning reached, -EIO if write ended in
586 error or zero if write successful. Asynchronous writes are used only in
587 variable block mode. */
588static int write_behind_check(struct scsi_tape * STp)
589{
590 int retval = 0;
591 struct st_buffer *STbuffer;
592 struct st_partstat *STps;
593 struct st_cmdstatus *cmdstatp;
594 struct st_request *SRpnt;
595
596 STbuffer = STp->buffer;
597 if (!STbuffer->writing)
598 return 0;
599
600 DEB(
601 if (STp->write_pending)
602 STp->nbr_waits++;
603 else
604 STp->nbr_finished++;
605 ) /* end DEB */
606
607 wait_for_completion(&(STp->wait));
608 SRpnt = STbuffer->last_SRpnt;
609 STbuffer->last_SRpnt = NULL;
610 SRpnt->waiting = NULL;
611
612 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
613 st_release_request(SRpnt);
614
615 STbuffer->buffer_bytes -= STbuffer->writing;
616 STps = &(STp->ps[STp->partition]);
617 if (STps->drv_block >= 0) {
618 if (STp->block_size == 0)
619 STps->drv_block++;
620 else
621 STps->drv_block += STbuffer->writing / STp->block_size;
622 }
623
624 cmdstatp = &STbuffer->cmdstat;
625 if (STbuffer->syscall_result) {
626 retval = -EIO;
627 if (cmdstatp->have_sense && !cmdstatp->deferred &&
628 (cmdstatp->flags & SENSE_EOM) &&
629 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
630 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
631 /* EOM at write-behind, has all data been written? */
632 if (!cmdstatp->remainder_valid ||
633 cmdstatp->uremainder64 == 0)
634 retval = -ENOSPC;
635 }
636 if (retval == -EIO)
637 STps->drv_block = -1;
638 }
639 STbuffer->writing = 0;
640
641 DEB(if (debugging && retval)
642 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
643 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
644
645 return retval;
646}
647
648
649/* Step over EOF if it has been inadvertently crossed (ioctl not used because
650 it messes up the block number). */
651static int cross_eof(struct scsi_tape * STp, int forward)
652{
653 struct st_request *SRpnt;
654 unsigned char cmd[MAX_COMMAND_SIZE];
655
656 cmd[0] = SPACE;
657 cmd[1] = 0x01; /* Space FileMarks */
658 if (forward) {
659 cmd[2] = cmd[3] = 0;
660 cmd[4] = 1;
661 } else
662 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
663 cmd[5] = 0;
664
665 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
666 tape_name(STp), forward ? "forward" : "backward"));
667
668 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
669 STp->device->request_queue->rq_timeout,
670 MAX_RETRIES, 1);
671 if (!SRpnt)
672 return (STp->buffer)->syscall_result;
673
674 st_release_request(SRpnt);
675 SRpnt = NULL;
676
677 if ((STp->buffer)->cmdstat.midlevel_result != 0)
678 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
679 tape_name(STp), forward ? "forward" : "backward");
680
681 return (STp->buffer)->syscall_result;
682}
683
684
685/* Flush the write buffer (never need to write if variable blocksize). */
686static int st_flush_write_buffer(struct scsi_tape * STp)
687{
688 int transfer, blks;
689 int result;
690 unsigned char cmd[MAX_COMMAND_SIZE];
691 struct st_request *SRpnt;
692 struct st_partstat *STps;
693
694 result = write_behind_check(STp);
695 if (result)
696 return result;
697
698 result = 0;
699 if (STp->dirty == 1) {
700
701 transfer = STp->buffer->buffer_bytes;
702 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
703 tape_name(STp), transfer));
704
705 memset(cmd, 0, MAX_COMMAND_SIZE);
706 cmd[0] = WRITE_6;
707 cmd[1] = 1;
708 blks = transfer / STp->block_size;
709 cmd[2] = blks >> 16;
710 cmd[3] = blks >> 8;
711 cmd[4] = blks;
712
713 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
714 STp->device->request_queue->rq_timeout,
715 MAX_WRITE_RETRIES, 1);
716 if (!SRpnt)
717 return (STp->buffer)->syscall_result;
718
719 STps = &(STp->ps[STp->partition]);
720 if ((STp->buffer)->syscall_result != 0) {
721 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
722
723 if (cmdstatp->have_sense && !cmdstatp->deferred &&
724 (cmdstatp->flags & SENSE_EOM) &&
725 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
726 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
727 (!cmdstatp->remainder_valid ||
728 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
729 STp->dirty = 0;
730 (STp->buffer)->buffer_bytes = 0;
731 if (STps->drv_block >= 0)
732 STps->drv_block += blks;
733 result = (-ENOSPC);
734 } else {
735 printk(KERN_ERR "%s: Error on flush.\n",
736 tape_name(STp));
737 STps->drv_block = (-1);
738 result = (-EIO);
739 }
740 } else {
741 if (STps->drv_block >= 0)
742 STps->drv_block += blks;
743 STp->dirty = 0;
744 (STp->buffer)->buffer_bytes = 0;
745 }
746 st_release_request(SRpnt);
747 SRpnt = NULL;
748 }
749 return result;
750}
751
752
753/* Flush the tape buffer. The tape will be positioned correctly unless
754 seek_next is true. */
755static int flush_buffer(struct scsi_tape *STp, int seek_next)
756{
757 int backspace, result;
758 struct st_buffer *STbuffer;
759 struct st_partstat *STps;
760
761 STbuffer = STp->buffer;
762
763 /*
764 * If there was a bus reset, block further access
765 * to this device.
766 */
767 if (STp->pos_unknown)
768 return (-EIO);
769
770 if (STp->ready != ST_READY)
771 return 0;
772 STps = &(STp->ps[STp->partition]);
773 if (STps->rw == ST_WRITING) /* Writing */
774 return st_flush_write_buffer(STp);
775
776 if (STp->block_size == 0)
777 return 0;
778
779 backspace = ((STp->buffer)->buffer_bytes +
780 (STp->buffer)->read_pointer) / STp->block_size -
781 ((STp->buffer)->read_pointer + STp->block_size - 1) /
782 STp->block_size;
783 (STp->buffer)->buffer_bytes = 0;
784 (STp->buffer)->read_pointer = 0;
785 result = 0;
786 if (!seek_next) {
787 if (STps->eof == ST_FM_HIT) {
788 result = cross_eof(STp, 0); /* Back over the EOF hit */
789 if (!result)
790 STps->eof = ST_NOEOF;
791 else {
792 if (STps->drv_file >= 0)
793 STps->drv_file++;
794 STps->drv_block = 0;
795 }
796 }
797 if (!result && backspace > 0)
798 result = st_int_ioctl(STp, MTBSR, backspace);
799 } else if (STps->eof == ST_FM_HIT) {
800 if (STps->drv_file >= 0)
801 STps->drv_file++;
802 STps->drv_block = 0;
803 STps->eof = ST_NOEOF;
804 }
805 return result;
806
807}
808
809/* Set the mode parameters */
810static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
811{
812 int set_it = 0;
813 unsigned long arg;
814 char *name = tape_name(STp);
815
816 if (!STp->density_changed &&
817 STm->default_density >= 0 &&
818 STm->default_density != STp->density) {
819 arg = STm->default_density;
820 set_it = 1;
821 } else
822 arg = STp->density;
823 arg <<= MT_ST_DENSITY_SHIFT;
824 if (!STp->blksize_changed &&
825 STm->default_blksize >= 0 &&
826 STm->default_blksize != STp->block_size) {
827 arg |= STm->default_blksize;
828 set_it = 1;
829 } else
830 arg |= STp->block_size;
831 if (set_it &&
832 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
833 printk(KERN_WARNING
834 "%s: Can't set default block size to %d bytes and density %x.\n",
835 name, STm->default_blksize, STm->default_density);
836 if (modes_defined)
837 return (-EINVAL);
838 }
839 return 0;
840}
841
842
843/* Lock or unlock the drive door. Don't use when st_request allocated. */
844static int do_door_lock(struct scsi_tape * STp, int do_lock)
845{
846 int retval, cmd;
847 DEB(char *name = tape_name(STp);)
848
849
850 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
851 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
852 do_lock ? "L" : "Unl"));
853 retval = scsi_ioctl(STp->device, cmd, NULL);
854 if (!retval) {
855 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
856 }
857 else {
858 STp->door_locked = ST_LOCK_FAILS;
859 }
860 return retval;
861}
862
863
864/* Set the internal state after reset */
865static void reset_state(struct scsi_tape *STp)
866{
867 int i;
868 struct st_partstat *STps;
869
870 STp->pos_unknown = 0;
871 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
872 STps = &(STp->ps[i]);
873 STps->rw = ST_IDLE;
874 STps->eof = ST_NOEOF;
875 STps->at_sm = 0;
876 STps->last_block_valid = 0;
877 STps->drv_block = -1;
878 STps->drv_file = -1;
879 }
880 if (STp->can_partitions) {
881 STp->partition = find_partition(STp);
882 if (STp->partition < 0)
883 STp->partition = 0;
884 STp->new_partition = STp->partition;
885 }
886}
887
888/* Test if the drive is ready. Returns either one of the codes below or a negative system
889 error code. */
890#define CHKRES_READY 0
891#define CHKRES_NEW_SESSION 1
892#define CHKRES_NOT_READY 2
893#define CHKRES_NO_TAPE 3
894
895#define MAX_ATTENTIONS 10
896
897static int test_ready(struct scsi_tape *STp, int do_wait)
898{
899 int attentions, waits, max_wait, scode;
900 int retval = CHKRES_READY, new_session = 0;
901 unsigned char cmd[MAX_COMMAND_SIZE];
902 struct st_request *SRpnt = NULL;
903 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
904
905 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
906
907 for (attentions=waits=0; ; ) {
908 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
909 cmd[0] = TEST_UNIT_READY;
910 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
911 STp->long_timeout, MAX_READY_RETRIES, 1);
912
913 if (!SRpnt) {
914 retval = (STp->buffer)->syscall_result;
915 break;
916 }
917
918 if (cmdstatp->have_sense) {
919
920 scode = cmdstatp->sense_hdr.sense_key;
921
922 if (scode == UNIT_ATTENTION) { /* New media? */
923 new_session = 1;
924 if (attentions < MAX_ATTENTIONS) {
925 attentions++;
926 continue;
927 }
928 else {
929 retval = (-EIO);
930 break;
931 }
932 }
933
934 if (scode == NOT_READY) {
935 if (waits < max_wait) {
936 if (msleep_interruptible(1000)) {
937 retval = (-EINTR);
938 break;
939 }
940 waits++;
941 continue;
942 }
943 else {
944 if ((STp->device)->scsi_level >= SCSI_2 &&
945 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
946 retval = CHKRES_NO_TAPE;
947 else
948 retval = CHKRES_NOT_READY;
949 break;
950 }
951 }
952 }
953
954 retval = (STp->buffer)->syscall_result;
955 if (!retval)
956 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
957 break;
958 }
959
960 if (SRpnt != NULL)
961 st_release_request(SRpnt);
962 return retval;
963}
964
965
966/* See if the drive is ready and gather information about the tape. Return values:
967 < 0 negative error code from errno.h
968 0 drive ready
969 1 drive not ready (possibly no tape)
970*/
971static int check_tape(struct scsi_tape *STp, struct file *filp)
972{
973 int i, retval, new_session = 0, do_wait;
974 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
975 unsigned short st_flags = filp->f_flags;
976 struct st_request *SRpnt = NULL;
977 struct st_modedef *STm;
978 struct st_partstat *STps;
979 char *name = tape_name(STp);
980 struct inode *inode = file_inode(filp);
981 int mode = TAPE_MODE(inode);
982
983 STp->ready = ST_READY;
984
985 if (mode != STp->current_mode) {
986 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
987 name, STp->current_mode, mode));
988 new_session = 1;
989 STp->current_mode = mode;
990 }
991 STm = &(STp->modes[STp->current_mode]);
992
993 saved_cleaning = STp->cleaning_req;
994 STp->cleaning_req = 0;
995
996 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
997 retval = test_ready(STp, do_wait);
998
999 if (retval < 0)
1000 goto err_out;
1001
1002 if (retval == CHKRES_NEW_SESSION) {
1003 STp->pos_unknown = 0;
1004 STp->partition = STp->new_partition = 0;
1005 if (STp->can_partitions)
1006 STp->nbr_partitions = 1; /* This guess will be updated later
1007 if necessary */
1008 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1009 STps = &(STp->ps[i]);
1010 STps->rw = ST_IDLE;
1011 STps->eof = ST_NOEOF;
1012 STps->at_sm = 0;
1013 STps->last_block_valid = 0;
1014 STps->drv_block = 0;
1015 STps->drv_file = 0;
1016 }
1017 new_session = 1;
1018 }
1019 else {
1020 STp->cleaning_req |= saved_cleaning;
1021
1022 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1023 if (retval == CHKRES_NO_TAPE)
1024 STp->ready = ST_NO_TAPE;
1025 else
1026 STp->ready = ST_NOT_READY;
1027
1028 STp->density = 0; /* Clear the erroneous "residue" */
1029 STp->write_prot = 0;
1030 STp->block_size = 0;
1031 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1032 STp->partition = STp->new_partition = 0;
1033 STp->door_locked = ST_UNLOCKED;
1034 return CHKRES_NOT_READY;
1035 }
1036 }
1037
1038 if (STp->omit_blklims)
1039 STp->min_block = STp->max_block = (-1);
1040 else {
1041 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1042 cmd[0] = READ_BLOCK_LIMITS;
1043
1044 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1045 STp->device->request_queue->rq_timeout,
1046 MAX_READY_RETRIES, 1);
1047 if (!SRpnt) {
1048 retval = (STp->buffer)->syscall_result;
1049 goto err_out;
1050 }
1051
1052 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1053 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1054 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1055 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1056 (STp->buffer)->b_data[5];
1057 if ( DEB( debugging || ) !STp->inited)
1058 printk(KERN_INFO
1059 "%s: Block limits %d - %d bytes.\n", name,
1060 STp->min_block, STp->max_block);
1061 } else {
1062 STp->min_block = STp->max_block = (-1);
1063 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1064 name));
1065 }
1066 }
1067
1068 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1069 cmd[0] = MODE_SENSE;
1070 cmd[4] = 12;
1071
1072 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1073 STp->device->request_queue->rq_timeout,
1074 MAX_READY_RETRIES, 1);
1075 if (!SRpnt) {
1076 retval = (STp->buffer)->syscall_result;
1077 goto err_out;
1078 }
1079
1080 if ((STp->buffer)->syscall_result != 0) {
1081 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1082 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1083 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1084 STp->drv_write_prot = 0;
1085 } else {
1086 DEBC(printk(ST_DEB_MSG
1087 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1088 name,
1089 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1090 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1091
1092 if ((STp->buffer)->b_data[3] >= 8) {
1093 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1094 STp->density = (STp->buffer)->b_data[4];
1095 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1096 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1097 DEBC(printk(ST_DEB_MSG
1098 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1099 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1100 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1101 STp->drv_buffer));
1102 }
1103 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1104 if (!STp->drv_buffer && STp->immediate_filemark) {
1105 printk(KERN_WARNING
1106 "%s: non-buffered tape: disabling writing immediate filemarks\n",
1107 name);
1108 STp->immediate_filemark = 0;
1109 }
1110 }
1111 st_release_request(SRpnt);
1112 SRpnt = NULL;
1113 STp->inited = 1;
1114
1115 if (STp->block_size > 0)
1116 (STp->buffer)->buffer_blocks =
1117 (STp->buffer)->buffer_size / STp->block_size;
1118 else
1119 (STp->buffer)->buffer_blocks = 1;
1120 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1121
1122 DEBC(printk(ST_DEB_MSG
1123 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1124 STp->block_size, (STp->buffer)->buffer_size,
1125 (STp->buffer)->buffer_blocks));
1126
1127 if (STp->drv_write_prot) {
1128 STp->write_prot = 1;
1129
1130 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1131
1132 if (do_wait &&
1133 ((st_flags & O_ACCMODE) == O_WRONLY ||
1134 (st_flags & O_ACCMODE) == O_RDWR)) {
1135 retval = (-EROFS);
1136 goto err_out;
1137 }
1138 }
1139
1140 if (STp->can_partitions && STp->nbr_partitions < 1) {
1141 /* This code is reached when the device is opened for the first time
1142 after the driver has been initialized with tape in the drive and the
1143 partition support has been enabled. */
1144 DEBC(printk(ST_DEB_MSG
1145 "%s: Updating partition number in status.\n", name));
1146 if ((STp->partition = find_partition(STp)) < 0) {
1147 retval = STp->partition;
1148 goto err_out;
1149 }
1150 STp->new_partition = STp->partition;
1151 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1152 }
1153
1154 if (new_session) { /* Change the drive parameters for the new mode */
1155 STp->density_changed = STp->blksize_changed = 0;
1156 STp->compression_changed = 0;
1157 if (!(STm->defaults_for_writes) &&
1158 (retval = set_mode_densblk(STp, STm)) < 0)
1159 goto err_out;
1160
1161 if (STp->default_drvbuffer != 0xff) {
1162 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1163 printk(KERN_WARNING
1164 "%s: Can't set default drive buffering to %d.\n",
1165 name, STp->default_drvbuffer);
1166 }
1167 }
1168
1169 return CHKRES_READY;
1170
1171 err_out:
1172 return retval;
1173}
1174
1175
1176 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1177 module count. */
1178static int st_open(struct inode *inode, struct file *filp)
1179{
1180 int i, retval = (-EIO);
1181 int resumed = 0;
1182 struct scsi_tape *STp;
1183 struct st_partstat *STps;
1184 int dev = TAPE_NR(inode);
1185 char *name;
1186
1187 /*
1188 * We really want to do nonseekable_open(inode, filp); here, but some
1189 * versions of tar incorrectly call lseek on tapes and bail out if that
1190 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1191 */
1192 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1193
1194 if (!(STp = scsi_tape_get(dev))) {
1195 return -ENXIO;
1196 }
1197
1198 filp->private_data = STp;
1199 name = tape_name(STp);
1200
1201 spin_lock(&st_use_lock);
1202 if (STp->in_use) {
1203 spin_unlock(&st_use_lock);
1204 scsi_tape_put(STp);
1205 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1206 return (-EBUSY);
1207 }
1208
1209 STp->in_use = 1;
1210 spin_unlock(&st_use_lock);
1211 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1212
1213 if (scsi_autopm_get_device(STp->device) < 0) {
1214 retval = -EIO;
1215 goto err_out;
1216 }
1217 resumed = 1;
1218 if (!scsi_block_when_processing_errors(STp->device)) {
1219 retval = (-ENXIO);
1220 goto err_out;
1221 }
1222
1223 /* See that we have at least a one page buffer available */
1224 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1225 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1226 name);
1227 retval = (-EOVERFLOW);
1228 goto err_out;
1229 }
1230
1231 (STp->buffer)->cleared = 0;
1232 (STp->buffer)->writing = 0;
1233 (STp->buffer)->syscall_result = 0;
1234
1235 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1236
1237 STp->dirty = 0;
1238 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1239 STps = &(STp->ps[i]);
1240 STps->rw = ST_IDLE;
1241 }
1242 STp->try_dio_now = STp->try_dio;
1243 STp->recover_count = 0;
1244 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1245 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1246
1247 retval = check_tape(STp, filp);
1248 if (retval < 0)
1249 goto err_out;
1250 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1251 retval != CHKRES_READY) {
1252 if (STp->ready == NO_TAPE)
1253 retval = (-ENOMEDIUM);
1254 else
1255 retval = (-EIO);
1256 goto err_out;
1257 }
1258 return 0;
1259
1260 err_out:
1261 normalize_buffer(STp->buffer);
1262 spin_lock(&st_use_lock);
1263 STp->in_use = 0;
1264 spin_unlock(&st_use_lock);
1265 scsi_tape_put(STp);
1266 if (resumed)
1267 scsi_autopm_put_device(STp->device);
1268 return retval;
1269
1270}
1271
1272
1273/* Flush the tape buffer before close */
1274static int st_flush(struct file *filp, fl_owner_t id)
1275{
1276 int result = 0, result2;
1277 unsigned char cmd[MAX_COMMAND_SIZE];
1278 struct st_request *SRpnt;
1279 struct scsi_tape *STp = filp->private_data;
1280 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1281 struct st_partstat *STps = &(STp->ps[STp->partition]);
1282 char *name = tape_name(STp);
1283
1284 if (file_count(filp) > 1)
1285 return 0;
1286
1287 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1288 result = st_flush_write_buffer(STp);
1289 if (result != 0 && result != (-ENOSPC))
1290 goto out;
1291 }
1292
1293 if (STp->can_partitions &&
1294 (result2 = switch_partition(STp)) < 0) {
1295 DEBC(printk(ST_DEB_MSG
1296 "%s: switch_partition at close failed.\n", name));
1297 if (result == 0)
1298 result = result2;
1299 goto out;
1300 }
1301
1302 DEBC( if (STp->nbr_requests)
1303 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1304 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1305
1306 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1307 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1308
1309 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1310 name, STp->nbr_waits, STp->nbr_finished);
1311 )
1312
1313 memset(cmd, 0, MAX_COMMAND_SIZE);
1314 cmd[0] = WRITE_FILEMARKS;
1315 if (STp->immediate_filemark)
1316 cmd[1] = 1;
1317 cmd[4] = 1 + STp->two_fm;
1318
1319 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1320 STp->device->request_queue->rq_timeout,
1321 MAX_WRITE_RETRIES, 1);
1322 if (!SRpnt) {
1323 result = (STp->buffer)->syscall_result;
1324 goto out;
1325 }
1326
1327 if (STp->buffer->syscall_result == 0 ||
1328 (cmdstatp->have_sense && !cmdstatp->deferred &&
1329 (cmdstatp->flags & SENSE_EOM) &&
1330 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1331 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1332 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1333 /* Write successful at EOM */
1334 st_release_request(SRpnt);
1335 SRpnt = NULL;
1336 if (STps->drv_file >= 0)
1337 STps->drv_file++;
1338 STps->drv_block = 0;
1339 if (STp->two_fm)
1340 cross_eof(STp, 0);
1341 STps->eof = ST_FM;
1342 }
1343 else { /* Write error */
1344 st_release_request(SRpnt);
1345 SRpnt = NULL;
1346 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1347 if (result == 0)
1348 result = (-EIO);
1349 }
1350
1351 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1352 name, cmd[4]));
1353 } else if (!STp->rew_at_close) {
1354 STps = &(STp->ps[STp->partition]);
1355 if (!STm->sysv || STps->rw != ST_READING) {
1356 if (STp->can_bsr)
1357 result = flush_buffer(STp, 0);
1358 else if (STps->eof == ST_FM_HIT) {
1359 result = cross_eof(STp, 0);
1360 if (result) {
1361 if (STps->drv_file >= 0)
1362 STps->drv_file++;
1363 STps->drv_block = 0;
1364 STps->eof = ST_FM;
1365 } else
1366 STps->eof = ST_NOEOF;
1367 }
1368 } else if ((STps->eof == ST_NOEOF &&
1369 !(result = cross_eof(STp, 1))) ||
1370 STps->eof == ST_FM_HIT) {
1371 if (STps->drv_file >= 0)
1372 STps->drv_file++;
1373 STps->drv_block = 0;
1374 STps->eof = ST_FM;
1375 }
1376 }
1377
1378 out:
1379 if (STp->rew_at_close) {
1380 result2 = st_int_ioctl(STp, MTREW, 1);
1381 if (result == 0)
1382 result = result2;
1383 }
1384 return result;
1385}
1386
1387
1388/* Close the device and release it. BKL is not needed: this is the only thread
1389 accessing this tape. */
1390static int st_release(struct inode *inode, struct file *filp)
1391{
1392 int result = 0;
1393 struct scsi_tape *STp = filp->private_data;
1394
1395 if (STp->door_locked == ST_LOCKED_AUTO)
1396 do_door_lock(STp, 0);
1397
1398 normalize_buffer(STp->buffer);
1399 spin_lock(&st_use_lock);
1400 STp->in_use = 0;
1401 spin_unlock(&st_use_lock);
1402 scsi_autopm_put_device(STp->device);
1403 scsi_tape_put(STp);
1404
1405 return result;
1406}
1407
1408/* The checks common to both reading and writing */
1409static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1410{
1411 ssize_t retval = 0;
1412
1413 /*
1414 * If we are in the middle of error recovery, don't let anyone
1415 * else try and use this device. Also, if error recovery fails, it
1416 * may try and take the device offline, in which case all further
1417 * access to the device is prohibited.
1418 */
1419 if (!scsi_block_when_processing_errors(STp->device)) {
1420 retval = (-ENXIO);
1421 goto out;
1422 }
1423
1424 if (STp->ready != ST_READY) {
1425 if (STp->ready == ST_NO_TAPE)
1426 retval = (-ENOMEDIUM);
1427 else
1428 retval = (-EIO);
1429 goto out;
1430 }
1431
1432 if (! STp->modes[STp->current_mode].defined) {
1433 retval = (-ENXIO);
1434 goto out;
1435 }
1436
1437
1438 /*
1439 * If there was a bus reset, block further access
1440 * to this device.
1441 */
1442 if (STp->pos_unknown) {
1443 retval = (-EIO);
1444 goto out;
1445 }
1446
1447 if (count == 0)
1448 goto out;
1449
1450 DEB(
1451 if (!STp->in_use) {
1452 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1453 retval = (-EIO);
1454 goto out;
1455 } ) /* end DEB */
1456
1457 if (STp->can_partitions &&
1458 (retval = switch_partition(STp)) < 0)
1459 goto out;
1460
1461 if (STp->block_size == 0 && STp->max_block > 0 &&
1462 (count < STp->min_block || count > STp->max_block)) {
1463 retval = (-EINVAL);
1464 goto out;
1465 }
1466
1467 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1468 !do_door_lock(STp, 1))
1469 STp->door_locked = ST_LOCKED_AUTO;
1470
1471 out:
1472 return retval;
1473}
1474
1475
1476static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1477 size_t count, int is_read)
1478{
1479 int i, bufsize, retval = 0;
1480 struct st_buffer *STbp = STp->buffer;
1481
1482 if (is_read)
1483 i = STp->try_dio_now && try_rdio;
1484 else
1485 i = STp->try_dio_now && try_wdio;
1486
1487 if (i && ((unsigned long)buf & queue_dma_alignment(
1488 STp->device->request_queue)) == 0) {
1489 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1490 count, (is_read ? READ : WRITE));
1491 if (i > 0) {
1492 STbp->do_dio = i;
1493 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1494 }
1495 else
1496 STbp->do_dio = 0; /* fall back to buffering with any error */
1497 STbp->sg_segs = STbp->do_dio;
1498 DEB(
1499 if (STbp->do_dio) {
1500 STp->nbr_dio++;
1501 STp->nbr_pages += STbp->do_dio;
1502 }
1503 )
1504 } else
1505 STbp->do_dio = 0;
1506 DEB( STp->nbr_requests++; )
1507
1508 if (!STbp->do_dio) {
1509 if (STp->block_size)
1510 bufsize = STp->block_size > st_fixed_buffer_size ?
1511 STp->block_size : st_fixed_buffer_size;
1512 else {
1513 bufsize = count;
1514 /* Make sure that data from previous user is not leaked even if
1515 HBA does not return correct residual */
1516 if (is_read && STp->sili && !STbp->cleared)
1517 clear_buffer(STbp);
1518 }
1519
1520 if (bufsize > STbp->buffer_size &&
1521 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1522 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1523 tape_name(STp), bufsize);
1524 retval = (-EOVERFLOW);
1525 goto out;
1526 }
1527 if (STp->block_size)
1528 STbp->buffer_blocks = bufsize / STp->block_size;
1529 }
1530
1531 out:
1532 return retval;
1533}
1534
1535
1536/* Can be called more than once after each setup_buffer() */
1537static void release_buffering(struct scsi_tape *STp, int is_read)
1538{
1539 struct st_buffer *STbp;
1540
1541 STbp = STp->buffer;
1542 if (STbp->do_dio) {
1543 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1544 STbp->do_dio = 0;
1545 STbp->sg_segs = 0;
1546 }
1547}
1548
1549
1550/* Write command */
1551static ssize_t
1552st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1553{
1554 ssize_t total;
1555 ssize_t i, do_count, blks, transfer;
1556 ssize_t retval;
1557 int undone, retry_eot = 0, scode;
1558 int async_write;
1559 unsigned char cmd[MAX_COMMAND_SIZE];
1560 const char __user *b_point;
1561 struct st_request *SRpnt = NULL;
1562 struct scsi_tape *STp = filp->private_data;
1563 struct st_modedef *STm;
1564 struct st_partstat *STps;
1565 struct st_buffer *STbp;
1566 char *name = tape_name(STp);
1567
1568 if (mutex_lock_interruptible(&STp->lock))
1569 return -ERESTARTSYS;
1570
1571 retval = rw_checks(STp, filp, count);
1572 if (retval || count == 0)
1573 goto out;
1574
1575 /* Write must be integral number of blocks */
1576 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1577 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1578 name);
1579 retval = (-EINVAL);
1580 goto out;
1581 }
1582
1583 STm = &(STp->modes[STp->current_mode]);
1584 STps = &(STp->ps[STp->partition]);
1585
1586 if (STp->write_prot) {
1587 retval = (-EACCES);
1588 goto out;
1589 }
1590
1591
1592 if (STps->rw == ST_READING) {
1593 retval = flush_buffer(STp, 0);
1594 if (retval)
1595 goto out;
1596 STps->rw = ST_WRITING;
1597 } else if (STps->rw != ST_WRITING &&
1598 STps->drv_file == 0 && STps->drv_block == 0) {
1599 if ((retval = set_mode_densblk(STp, STm)) < 0)
1600 goto out;
1601 if (STm->default_compression != ST_DONT_TOUCH &&
1602 !(STp->compression_changed)) {
1603 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1604 printk(KERN_WARNING "%s: Can't set default compression.\n",
1605 name);
1606 if (modes_defined) {
1607 retval = (-EINVAL);
1608 goto out;
1609 }
1610 }
1611 }
1612 }
1613
1614 STbp = STp->buffer;
1615 i = write_behind_check(STp);
1616 if (i) {
1617 if (i == -ENOSPC)
1618 STps->eof = ST_EOM_OK;
1619 else
1620 STps->eof = ST_EOM_ERROR;
1621 }
1622
1623 if (STps->eof == ST_EOM_OK) {
1624 STps->eof = ST_EOD_1; /* allow next write */
1625 retval = (-ENOSPC);
1626 goto out;
1627 }
1628 else if (STps->eof == ST_EOM_ERROR) {
1629 retval = (-EIO);
1630 goto out;
1631 }
1632
1633 /* Check the buffer readability in cases where copy_user might catch
1634 the problems after some tape movement. */
1635 if (STp->block_size != 0 &&
1636 !STbp->do_dio &&
1637 (copy_from_user(&i, buf, 1) != 0 ||
1638 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1639 retval = (-EFAULT);
1640 goto out;
1641 }
1642
1643 retval = setup_buffering(STp, buf, count, 0);
1644 if (retval)
1645 goto out;
1646
1647 total = count;
1648
1649 memset(cmd, 0, MAX_COMMAND_SIZE);
1650 cmd[0] = WRITE_6;
1651 cmd[1] = (STp->block_size != 0);
1652
1653 STps->rw = ST_WRITING;
1654
1655 b_point = buf;
1656 while (count > 0 && !retry_eot) {
1657
1658 if (STbp->do_dio) {
1659 do_count = count;
1660 }
1661 else {
1662 if (STp->block_size == 0)
1663 do_count = count;
1664 else {
1665 do_count = STbp->buffer_blocks * STp->block_size -
1666 STbp->buffer_bytes;
1667 if (do_count > count)
1668 do_count = count;
1669 }
1670
1671 i = append_to_buffer(b_point, STbp, do_count);
1672 if (i) {
1673 retval = i;
1674 goto out;
1675 }
1676 }
1677 count -= do_count;
1678 b_point += do_count;
1679
1680 async_write = STp->block_size == 0 && !STbp->do_dio &&
1681 STm->do_async_writes && STps->eof < ST_EOM_OK;
1682
1683 if (STp->block_size != 0 && STm->do_buffer_writes &&
1684 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1685 STbp->buffer_bytes < STbp->buffer_size) {
1686 STp->dirty = 1;
1687 /* Don't write a buffer that is not full enough. */
1688 if (!async_write && count == 0)
1689 break;
1690 }
1691
1692 retry_write:
1693 if (STp->block_size == 0)
1694 blks = transfer = do_count;
1695 else {
1696 if (!STbp->do_dio)
1697 blks = STbp->buffer_bytes;
1698 else
1699 blks = do_count;
1700 blks /= STp->block_size;
1701 transfer = blks * STp->block_size;
1702 }
1703 cmd[2] = blks >> 16;
1704 cmd[3] = blks >> 8;
1705 cmd[4] = blks;
1706
1707 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1708 STp->device->request_queue->rq_timeout,
1709 MAX_WRITE_RETRIES, !async_write);
1710 if (!SRpnt) {
1711 retval = STbp->syscall_result;
1712 goto out;
1713 }
1714 if (async_write && !STbp->syscall_result) {
1715 STbp->writing = transfer;
1716 STp->dirty = !(STbp->writing ==
1717 STbp->buffer_bytes);
1718 SRpnt = NULL; /* Prevent releasing this request! */
1719 DEB( STp->write_pending = 1; )
1720 break;
1721 }
1722
1723 if (STbp->syscall_result != 0) {
1724 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1725
1726 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1727 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1728 scode = cmdstatp->sense_hdr.sense_key;
1729 if (cmdstatp->remainder_valid)
1730 undone = (int)cmdstatp->uremainder64;
1731 else if (STp->block_size == 0 &&
1732 scode == VOLUME_OVERFLOW)
1733 undone = transfer;
1734 else
1735 undone = 0;
1736 if (STp->block_size != 0)
1737 undone *= STp->block_size;
1738 if (undone <= do_count) {
1739 /* Only data from this write is not written */
1740 count += undone;
1741 b_point -= undone;
1742 do_count -= undone;
1743 if (STp->block_size)
1744 blks = (transfer - undone) / STp->block_size;
1745 STps->eof = ST_EOM_OK;
1746 /* Continue in fixed block mode if all written
1747 in this request but still something left to write
1748 (retval left to zero)
1749 */
1750 if (STp->block_size == 0 ||
1751 undone > 0 || count == 0)
1752 retval = (-ENOSPC); /* EOM within current request */
1753 DEBC(printk(ST_DEB_MSG
1754 "%s: EOM with %d bytes unwritten.\n",
1755 name, (int)count));
1756 } else {
1757 /* EOT within data buffered earlier (possible only
1758 in fixed block mode without direct i/o) */
1759 if (!retry_eot && !cmdstatp->deferred &&
1760 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1761 move_buffer_data(STp->buffer, transfer - undone);
1762 retry_eot = 1;
1763 if (STps->drv_block >= 0) {
1764 STps->drv_block += (transfer - undone) /
1765 STp->block_size;
1766 }
1767 STps->eof = ST_EOM_OK;
1768 DEBC(printk(ST_DEB_MSG
1769 "%s: Retry write of %d bytes at EOM.\n",
1770 name, STp->buffer->buffer_bytes));
1771 goto retry_write;
1772 }
1773 else {
1774 /* Either error within data buffered by driver or
1775 failed retry */
1776 count -= do_count;
1777 blks = do_count = 0;
1778 STps->eof = ST_EOM_ERROR;
1779 STps->drv_block = (-1); /* Too cautious? */
1780 retval = (-EIO); /* EOM for old data */
1781 DEBC(printk(ST_DEB_MSG
1782 "%s: EOM with lost data.\n",
1783 name));
1784 }
1785 }
1786 } else {
1787 count += do_count;
1788 STps->drv_block = (-1); /* Too cautious? */
1789 retval = STbp->syscall_result;
1790 }
1791
1792 }
1793
1794 if (STps->drv_block >= 0) {
1795 if (STp->block_size == 0)
1796 STps->drv_block += (do_count > 0);
1797 else
1798 STps->drv_block += blks;
1799 }
1800
1801 STbp->buffer_bytes = 0;
1802 STp->dirty = 0;
1803
1804 if (retval || retry_eot) {
1805 if (count < total)
1806 retval = total - count;
1807 goto out;
1808 }
1809 }
1810
1811 if (STps->eof == ST_EOD_1)
1812 STps->eof = ST_EOM_OK;
1813 else if (STps->eof != ST_EOM_OK)
1814 STps->eof = ST_NOEOF;
1815 retval = total - count;
1816
1817 out:
1818 if (SRpnt != NULL)
1819 st_release_request(SRpnt);
1820 release_buffering(STp, 0);
1821 mutex_unlock(&STp->lock);
1822
1823 return retval;
1824}
1825
1826/* Read data from the tape. Returns zero in the normal case, one if the
1827 eof status has changed, and the negative error code in case of a
1828 fatal error. Otherwise updates the buffer and the eof state.
1829
1830 Does release user buffer mapping if it is set.
1831*/
1832static long read_tape(struct scsi_tape *STp, long count,
1833 struct st_request ** aSRpnt)
1834{
1835 int transfer, blks, bytes;
1836 unsigned char cmd[MAX_COMMAND_SIZE];
1837 struct st_request *SRpnt;
1838 struct st_modedef *STm;
1839 struct st_partstat *STps;
1840 struct st_buffer *STbp;
1841 int retval = 0;
1842 char *name = tape_name(STp);
1843
1844 if (count == 0)
1845 return 0;
1846
1847 STm = &(STp->modes[STp->current_mode]);
1848 STps = &(STp->ps[STp->partition]);
1849 if (STps->eof == ST_FM_HIT)
1850 return 1;
1851 STbp = STp->buffer;
1852
1853 if (STp->block_size == 0)
1854 blks = bytes = count;
1855 else {
1856 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1857 blks = (STp->buffer)->buffer_blocks;
1858 bytes = blks * STp->block_size;
1859 } else {
1860 bytes = count;
1861 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1862 bytes = (STp->buffer)->buffer_size;
1863 blks = bytes / STp->block_size;
1864 bytes = blks * STp->block_size;
1865 }
1866 }
1867
1868 memset(cmd, 0, MAX_COMMAND_SIZE);
1869 cmd[0] = READ_6;
1870 cmd[1] = (STp->block_size != 0);
1871 if (!cmd[1] && STp->sili)
1872 cmd[1] |= 2;
1873 cmd[2] = blks >> 16;
1874 cmd[3] = blks >> 8;
1875 cmd[4] = blks;
1876
1877 SRpnt = *aSRpnt;
1878 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1879 STp->device->request_queue->rq_timeout,
1880 MAX_RETRIES, 1);
1881 release_buffering(STp, 1);
1882 *aSRpnt = SRpnt;
1883 if (!SRpnt)
1884 return STbp->syscall_result;
1885
1886 STbp->read_pointer = 0;
1887 STps->at_sm = 0;
1888
1889 /* Something to check */
1890 if (STbp->syscall_result) {
1891 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1892
1893 retval = 1;
1894 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1895 name,
1896 SRpnt->sense[0], SRpnt->sense[1],
1897 SRpnt->sense[2], SRpnt->sense[3],
1898 SRpnt->sense[4], SRpnt->sense[5],
1899 SRpnt->sense[6], SRpnt->sense[7]));
1900 if (cmdstatp->have_sense) {
1901
1902 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1903 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1904
1905 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1906 /* Compute the residual count */
1907 if (cmdstatp->remainder_valid)
1908 transfer = (int)cmdstatp->uremainder64;
1909 else
1910 transfer = 0;
1911 if (STp->block_size == 0 &&
1912 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1913 transfer = bytes;
1914
1915 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1916 if (STp->block_size == 0) {
1917 if (transfer <= 0) {
1918 if (transfer < 0)
1919 printk(KERN_NOTICE
1920 "%s: Failed to read %d byte block with %d byte transfer.\n",
1921 name, bytes - transfer, bytes);
1922 if (STps->drv_block >= 0)
1923 STps->drv_block += 1;
1924 STbp->buffer_bytes = 0;
1925 return (-ENOMEM);
1926 }
1927 STbp->buffer_bytes = bytes - transfer;
1928 } else {
1929 st_release_request(SRpnt);
1930 SRpnt = *aSRpnt = NULL;
1931 if (transfer == blks) { /* We did not get anything, error */
1932 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1933 if (STps->drv_block >= 0)
1934 STps->drv_block += blks - transfer + 1;
1935 st_int_ioctl(STp, MTBSR, 1);
1936 return (-EIO);
1937 }
1938 /* We have some data, deliver it */
1939 STbp->buffer_bytes = (blks - transfer) *
1940 STp->block_size;
1941 DEBC(printk(ST_DEB_MSG
1942 "%s: ILI but enough data received %ld %d.\n",
1943 name, count, STbp->buffer_bytes));
1944 if (STps->drv_block >= 0)
1945 STps->drv_block += 1;
1946 if (st_int_ioctl(STp, MTBSR, 1))
1947 return (-EIO);
1948 }
1949 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1950 if (STps->eof != ST_FM_HIT)
1951 STps->eof = ST_FM_HIT;
1952 else
1953 STps->eof = ST_EOD_2;
1954 if (STp->block_size == 0)
1955 STbp->buffer_bytes = 0;
1956 else
1957 STbp->buffer_bytes =
1958 bytes - transfer * STp->block_size;
1959 DEBC(printk(ST_DEB_MSG
1960 "%s: EOF detected (%d bytes read).\n",
1961 name, STbp->buffer_bytes));
1962 } else if (cmdstatp->flags & SENSE_EOM) {
1963 if (STps->eof == ST_FM)
1964 STps->eof = ST_EOD_1;
1965 else
1966 STps->eof = ST_EOM_OK;
1967 if (STp->block_size == 0)
1968 STbp->buffer_bytes = bytes - transfer;
1969 else
1970 STbp->buffer_bytes =
1971 bytes - transfer * STp->block_size;
1972
1973 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1974 name, STbp->buffer_bytes));
1975 }
1976 }
1977 /* end of EOF, EOM, ILI test */
1978 else { /* nonzero sense key */
1979 DEBC(printk(ST_DEB_MSG
1980 "%s: Tape error while reading.\n", name));
1981 STps->drv_block = (-1);
1982 if (STps->eof == ST_FM &&
1983 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1984 DEBC(printk(ST_DEB_MSG
1985 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1986 name));
1987 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1988 } else /* Some other extended sense code */
1989 retval = (-EIO);
1990 }
1991
1992 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1993 STbp->buffer_bytes = 0;
1994 }
1995 /* End of extended sense test */
1996 else { /* Non-extended sense */
1997 retval = STbp->syscall_result;
1998 }
1999
2000 }
2001 /* End of error handling */
2002 else { /* Read successful */
2003 STbp->buffer_bytes = bytes;
2004 if (STp->sili) /* In fixed block mode residual is always zero here */
2005 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2006 }
2007
2008 if (STps->drv_block >= 0) {
2009 if (STp->block_size == 0)
2010 STps->drv_block++;
2011 else
2012 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2013 }
2014 return retval;
2015}
2016
2017
2018/* Read command */
2019static ssize_t
2020st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2021{
2022 ssize_t total;
2023 ssize_t retval = 0;
2024 ssize_t i, transfer;
2025 int special, do_dio = 0;
2026 struct st_request *SRpnt = NULL;
2027 struct scsi_tape *STp = filp->private_data;
2028 struct st_modedef *STm;
2029 struct st_partstat *STps;
2030 struct st_buffer *STbp = STp->buffer;
2031 DEB( char *name = tape_name(STp); )
2032
2033 if (mutex_lock_interruptible(&STp->lock))
2034 return -ERESTARTSYS;
2035
2036 retval = rw_checks(STp, filp, count);
2037 if (retval || count == 0)
2038 goto out;
2039
2040 STm = &(STp->modes[STp->current_mode]);
2041 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2042 if (!STm->do_read_ahead) {
2043 retval = (-EINVAL); /* Read must be integral number of blocks */
2044 goto out;
2045 }
2046 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2047 }
2048
2049 STps = &(STp->ps[STp->partition]);
2050 if (STps->rw == ST_WRITING) {
2051 retval = flush_buffer(STp, 0);
2052 if (retval)
2053 goto out;
2054 STps->rw = ST_READING;
2055 }
2056 DEB(
2057 if (debugging && STps->eof != ST_NOEOF)
2058 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2059 STps->eof, STbp->buffer_bytes);
2060 ) /* end DEB */
2061
2062 retval = setup_buffering(STp, buf, count, 1);
2063 if (retval)
2064 goto out;
2065 do_dio = STbp->do_dio;
2066
2067 if (STbp->buffer_bytes == 0 &&
2068 STps->eof >= ST_EOD_1) {
2069 if (STps->eof < ST_EOD) {
2070 STps->eof += 1;
2071 retval = 0;
2072 goto out;
2073 }
2074 retval = (-EIO); /* EOM or Blank Check */
2075 goto out;
2076 }
2077
2078 if (do_dio) {
2079 /* Check the buffer writability before any tape movement. Don't alter
2080 buffer data. */
2081 if (copy_from_user(&i, buf, 1) != 0 ||
2082 copy_to_user(buf, &i, 1) != 0 ||
2083 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2084 copy_to_user(buf + count - 1, &i, 1) != 0) {
2085 retval = (-EFAULT);
2086 goto out;
2087 }
2088 }
2089
2090 STps->rw = ST_READING;
2091
2092
2093 /* Loop until enough data in buffer or a special condition found */
2094 for (total = 0, special = 0; total < count && !special;) {
2095
2096 /* Get new data if the buffer is empty */
2097 if (STbp->buffer_bytes == 0) {
2098 special = read_tape(STp, count - total, &SRpnt);
2099 if (special < 0) { /* No need to continue read */
2100 retval = special;
2101 goto out;
2102 }
2103 }
2104
2105 /* Move the data from driver buffer to user buffer */
2106 if (STbp->buffer_bytes > 0) {
2107 DEB(
2108 if (debugging && STps->eof != ST_NOEOF)
2109 printk(ST_DEB_MSG
2110 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2111 STps->eof, STbp->buffer_bytes,
2112 (int)(count - total));
2113 ) /* end DEB */
2114 transfer = STbp->buffer_bytes < count - total ?
2115 STbp->buffer_bytes : count - total;
2116 if (!do_dio) {
2117 i = from_buffer(STbp, buf, transfer);
2118 if (i) {
2119 retval = i;
2120 goto out;
2121 }
2122 }
2123 buf += transfer;
2124 total += transfer;
2125 }
2126
2127 if (STp->block_size == 0)
2128 break; /* Read only one variable length block */
2129
2130 } /* for (total = 0, special = 0;
2131 total < count && !special; ) */
2132
2133 /* Change the eof state if no data from tape or buffer */
2134 if (total == 0) {
2135 if (STps->eof == ST_FM_HIT) {
2136 STps->eof = ST_FM;
2137 STps->drv_block = 0;
2138 if (STps->drv_file >= 0)
2139 STps->drv_file++;
2140 } else if (STps->eof == ST_EOD_1) {
2141 STps->eof = ST_EOD_2;
2142 STps->drv_block = 0;
2143 if (STps->drv_file >= 0)
2144 STps->drv_file++;
2145 } else if (STps->eof == ST_EOD_2)
2146 STps->eof = ST_EOD;
2147 } else if (STps->eof == ST_FM)
2148 STps->eof = ST_NOEOF;
2149 retval = total;
2150
2151 out:
2152 if (SRpnt != NULL) {
2153 st_release_request(SRpnt);
2154 SRpnt = NULL;
2155 }
2156 if (do_dio) {
2157 release_buffering(STp, 1);
2158 STbp->buffer_bytes = 0;
2159 }
2160 mutex_unlock(&STp->lock);
2161
2162 return retval;
2163}
2164
2165
2166
2167DEB(
2168/* Set the driver options */
2169static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2170{
2171 if (debugging) {
2172 printk(KERN_INFO
2173 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2174 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2175 STm->do_read_ahead);
2176 printk(KERN_INFO
2177 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2178 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2179 printk(KERN_INFO
2180 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2181 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2182 STp->scsi2_logical);
2183 printk(KERN_INFO
2184 "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n",
2185 name, STm->sysv, STp->immediate, STp->sili,
2186 STp->immediate_filemark);
2187 printk(KERN_INFO "%s: debugging: %d\n",
2188 name, debugging);
2189 }
2190}
2191 )
2192
2193
2194static int st_set_options(struct scsi_tape *STp, long options)
2195{
2196 int value;
2197 long code;
2198 struct st_modedef *STm;
2199 char *name = tape_name(STp);
2200 struct cdev *cd0, *cd1;
2201 struct device *d0, *d1;
2202
2203 STm = &(STp->modes[STp->current_mode]);
2204 if (!STm->defined) {
2205 cd0 = STm->cdevs[0];
2206 cd1 = STm->cdevs[1];
2207 d0 = STm->devs[0];
2208 d1 = STm->devs[1];
2209 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2210 STm->cdevs[0] = cd0;
2211 STm->cdevs[1] = cd1;
2212 STm->devs[0] = d0;
2213 STm->devs[1] = d1;
2214 modes_defined = 1;
2215 DEBC(printk(ST_DEB_MSG
2216 "%s: Initialized mode %d definition from mode 0\n",
2217 name, STp->current_mode));
2218 }
2219
2220 code = options & MT_ST_OPTIONS;
2221 if (code == MT_ST_BOOLEANS) {
2222 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2223 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2224 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2225 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2226 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2227 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2228 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2229 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2230 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2231 if ((STp->device)->scsi_level >= SCSI_2)
2232 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2233 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2234 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2235 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2236 STm->sysv = (options & MT_ST_SYSV) != 0;
2237 STp->sili = (options & MT_ST_SILI) != 0;
2238 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2239 st_log_options(STp, STm, name); )
2240 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2241 value = (code == MT_ST_SETBOOLEANS);
2242 if ((options & MT_ST_BUFFER_WRITES) != 0)
2243 STm->do_buffer_writes = value;
2244 if ((options & MT_ST_ASYNC_WRITES) != 0)
2245 STm->do_async_writes = value;
2246 if ((options & MT_ST_DEF_WRITES) != 0)
2247 STm->defaults_for_writes = value;
2248 if ((options & MT_ST_READ_AHEAD) != 0)
2249 STm->do_read_ahead = value;
2250 if ((options & MT_ST_TWO_FM) != 0)
2251 STp->two_fm = value;
2252 if ((options & MT_ST_FAST_MTEOM) != 0)
2253 STp->fast_mteom = value;
2254 if ((options & MT_ST_AUTO_LOCK) != 0)
2255 STp->do_auto_lock = value;
2256 if ((options & MT_ST_CAN_BSR) != 0)
2257 STp->can_bsr = value;
2258 if ((options & MT_ST_NO_BLKLIMS) != 0)
2259 STp->omit_blklims = value;
2260 if ((STp->device)->scsi_level >= SCSI_2 &&
2261 (options & MT_ST_CAN_PARTITIONS) != 0)
2262 STp->can_partitions = value;
2263 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2264 STp->scsi2_logical = value;
2265 if ((options & MT_ST_NOWAIT) != 0)
2266 STp->immediate = value;
2267 if ((options & MT_ST_NOWAIT_EOF) != 0)
2268 STp->immediate_filemark = value;
2269 if ((options & MT_ST_SYSV) != 0)
2270 STm->sysv = value;
2271 if ((options & MT_ST_SILI) != 0)
2272 STp->sili = value;
2273 DEB(
2274 if ((options & MT_ST_DEBUGGING) != 0)
2275 debugging = value;
2276 st_log_options(STp, STm, name); )
2277 } else if (code == MT_ST_WRITE_THRESHOLD) {
2278 /* Retained for compatibility */
2279 } else if (code == MT_ST_DEF_BLKSIZE) {
2280 value = (options & ~MT_ST_OPTIONS);
2281 if (value == ~MT_ST_OPTIONS) {
2282 STm->default_blksize = (-1);
2283 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2284 } else {
2285 STm->default_blksize = value;
2286 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2287 name, STm->default_blksize));
2288 if (STp->ready == ST_READY) {
2289 STp->blksize_changed = 0;
2290 set_mode_densblk(STp, STm);
2291 }
2292 }
2293 } else if (code == MT_ST_TIMEOUTS) {
2294 value = (options & ~MT_ST_OPTIONS);
2295 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2296 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2297 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2298 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2299 } else {
2300 blk_queue_rq_timeout(STp->device->request_queue,
2301 value * HZ);
2302 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2303 name, value) );
2304 }
2305 } else if (code == MT_ST_SET_CLN) {
2306 value = (options & ~MT_ST_OPTIONS) & 0xff;
2307 if (value != 0 &&
2308 (value < EXTENDED_SENSE_START ||
2309 value >= SCSI_SENSE_BUFFERSIZE))
2310 return (-EINVAL);
2311 STp->cln_mode = value;
2312 STp->cln_sense_mask = (options >> 8) & 0xff;
2313 STp->cln_sense_value = (options >> 16) & 0xff;
2314 printk(KERN_INFO
2315 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2316 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2317 } else if (code == MT_ST_DEF_OPTIONS) {
2318 code = (options & ~MT_ST_CLEAR_DEFAULT);
2319 value = (options & MT_ST_CLEAR_DEFAULT);
2320 if (code == MT_ST_DEF_DENSITY) {
2321 if (value == MT_ST_CLEAR_DEFAULT) {
2322 STm->default_density = (-1);
2323 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2324 name));
2325 } else {
2326 STm->default_density = value & 0xff;
2327 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2328 name, STm->default_density));
2329 if (STp->ready == ST_READY) {
2330 STp->density_changed = 0;
2331 set_mode_densblk(STp, STm);
2332 }
2333 }
2334 } else if (code == MT_ST_DEF_DRVBUFFER) {
2335 if (value == MT_ST_CLEAR_DEFAULT) {
2336 STp->default_drvbuffer = 0xff;
2337 DEBC( printk(KERN_INFO
2338 "%s: Drive buffer default disabled.\n", name));
2339 } else {
2340 STp->default_drvbuffer = value & 7;
2341 DEBC( printk(KERN_INFO
2342 "%s: Drive buffer default set to %x\n",
2343 name, STp->default_drvbuffer));
2344 if (STp->ready == ST_READY)
2345 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2346 }
2347 } else if (code == MT_ST_DEF_COMPRESSION) {
2348 if (value == MT_ST_CLEAR_DEFAULT) {
2349 STm->default_compression = ST_DONT_TOUCH;
2350 DEBC( printk(KERN_INFO
2351 "%s: Compression default disabled.\n", name));
2352 } else {
2353 if ((value & 0xff00) != 0) {
2354 STp->c_algo = (value & 0xff00) >> 8;
2355 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2356 name, STp->c_algo));
2357 }
2358 if ((value & 0xff) != 0xff) {
2359 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2360 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2361 name, (value & 1)));
2362 if (STp->ready == ST_READY) {
2363 STp->compression_changed = 0;
2364 st_compression(STp, (STm->default_compression == ST_YES));
2365 }
2366 }
2367 }
2368 }
2369 } else
2370 return (-EIO);
2371
2372 return 0;
2373}
2374
2375#define MODE_HEADER_LENGTH 4
2376
2377/* Mode header and page byte offsets */
2378#define MH_OFF_DATA_LENGTH 0
2379#define MH_OFF_MEDIUM_TYPE 1
2380#define MH_OFF_DEV_SPECIFIC 2
2381#define MH_OFF_BDESCS_LENGTH 3
2382#define MP_OFF_PAGE_NBR 0
2383#define MP_OFF_PAGE_LENGTH 1
2384
2385/* Mode header and page bit masks */
2386#define MH_BIT_WP 0x80
2387#define MP_MSK_PAGE_NBR 0x3f
2388
2389/* Don't return block descriptors */
2390#define MODE_SENSE_OMIT_BDESCS 0x08
2391
2392#define MODE_SELECT_PAGE_FORMAT 0x10
2393
2394/* Read a mode page into the tape buffer. The block descriptors are included
2395 if incl_block_descs is true. The page control is ored to the page number
2396 parameter, if necessary. */
2397static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2398{
2399 unsigned char cmd[MAX_COMMAND_SIZE];
2400 struct st_request *SRpnt;
2401
2402 memset(cmd, 0, MAX_COMMAND_SIZE);
2403 cmd[0] = MODE_SENSE;
2404 if (omit_block_descs)
2405 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2406 cmd[2] = page;
2407 cmd[4] = 255;
2408
2409 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2410 STp->device->request_queue->rq_timeout, 0, 1);
2411 if (SRpnt == NULL)
2412 return (STp->buffer)->syscall_result;
2413
2414 st_release_request(SRpnt);
2415
2416 return STp->buffer->syscall_result;
2417}
2418
2419
2420/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2421 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2422static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2423{
2424 int pgo;
2425 unsigned char cmd[MAX_COMMAND_SIZE];
2426 struct st_request *SRpnt;
2427 int timeout;
2428
2429 memset(cmd, 0, MAX_COMMAND_SIZE);
2430 cmd[0] = MODE_SELECT;
2431 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2432 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2433 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2434
2435 /* Clear reserved fields */
2436 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2437 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2438 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2439 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2440
2441 timeout = slow ?
2442 STp->long_timeout : STp->device->request_queue->rq_timeout;
2443 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2444 timeout, 0, 1);
2445 if (SRpnt == NULL)
2446 return (STp->buffer)->syscall_result;
2447
2448 st_release_request(SRpnt);
2449
2450 return STp->buffer->syscall_result;
2451}
2452
2453
2454#define COMPRESSION_PAGE 0x0f
2455#define COMPRESSION_PAGE_LENGTH 16
2456
2457#define CP_OFF_DCE_DCC 2
2458#define CP_OFF_C_ALGO 7
2459
2460#define DCE_MASK 0x80
2461#define DCC_MASK 0x40
2462#define RED_MASK 0x60
2463
2464
2465/* Control the compression with mode page 15. Algorithm not changed if zero.
2466
2467 The block descriptors are read and written because Sony SDT-7000 does not
2468 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2469 Including block descriptors should not cause any harm to other drives. */
2470
2471static int st_compression(struct scsi_tape * STp, int state)
2472{
2473 int retval;
2474 int mpoffs; /* Offset to mode page start */
2475 unsigned char *b_data = (STp->buffer)->b_data;
2476 DEB( char *name = tape_name(STp); )
2477
2478 if (STp->ready != ST_READY)
2479 return (-EIO);
2480
2481 /* Read the current page contents */
2482 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2483 if (retval) {
2484 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2485 name));
2486 return (-EIO);
2487 }
2488
2489 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2490 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2491 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2492
2493 /* Check if compression can be changed */
2494 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2495 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2496 return (-EIO);
2497 }
2498
2499 /* Do the change */
2500 if (state) {
2501 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2502 if (STp->c_algo != 0)
2503 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2504 }
2505 else {
2506 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2507 if (STp->c_algo != 0)
2508 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2509 }
2510
2511 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2512 if (retval) {
2513 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2514 return (-EIO);
2515 }
2516 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2517 name, state));
2518
2519 STp->compression_changed = 1;
2520 return 0;
2521}
2522
2523
2524/* Process the load and unload commands (does unload if the load code is zero) */
2525static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2526{
2527 int retval = (-EIO), timeout;
2528 DEB( char *name = tape_name(STp); )
2529 unsigned char cmd[MAX_COMMAND_SIZE];
2530 struct st_partstat *STps;
2531 struct st_request *SRpnt;
2532
2533 if (STp->ready != ST_READY && !load_code) {
2534 if (STp->ready == ST_NO_TAPE)
2535 return (-ENOMEDIUM);
2536 else
2537 return (-EIO);
2538 }
2539
2540 memset(cmd, 0, MAX_COMMAND_SIZE);
2541 cmd[0] = START_STOP;
2542 if (load_code)
2543 cmd[4] |= 1;
2544 /*
2545 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2546 */
2547 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2548 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2549 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2550 name, (cmd[4]) ? "" : "un",
2551 load_code - MT_ST_HPLOADER_OFFSET));
2552 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2553 }
2554 if (STp->immediate) {
2555 cmd[1] = 1; /* Don't wait for completion */
2556 timeout = STp->device->request_queue->rq_timeout;
2557 }
2558 else
2559 timeout = STp->long_timeout;
2560
2561 DEBC(
2562 if (!load_code)
2563 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2564 else
2565 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2566 );
2567
2568 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2569 timeout, MAX_RETRIES, 1);
2570 if (!SRpnt)
2571 return (STp->buffer)->syscall_result;
2572
2573 retval = (STp->buffer)->syscall_result;
2574 st_release_request(SRpnt);
2575
2576 if (!retval) { /* SCSI command successful */
2577
2578 if (!load_code) {
2579 STp->rew_at_close = 0;
2580 STp->ready = ST_NO_TAPE;
2581 }
2582 else {
2583 STp->rew_at_close = STp->autorew_dev;
2584 retval = check_tape(STp, filp);
2585 if (retval > 0)
2586 retval = 0;
2587 }
2588 }
2589 else {
2590 STps = &(STp->ps[STp->partition]);
2591 STps->drv_file = STps->drv_block = (-1);
2592 }
2593
2594 return retval;
2595}
2596
2597#if DEBUG
2598#define ST_DEB_FORWARD 0
2599#define ST_DEB_BACKWARD 1
2600static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2601{
2602 s32 sc;
2603
2604 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2605 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2606 if (direction)
2607 sc = -sc;
2608 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2609 direction ? "backward" : "forward", sc, units);
2610}
2611#endif
2612
2613
2614/* Internal ioctl function */
2615static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2616{
2617 int timeout;
2618 long ltmp;
2619 int ioctl_result;
2620 int chg_eof = 1;
2621 unsigned char cmd[MAX_COMMAND_SIZE];
2622 struct st_request *SRpnt;
2623 struct st_partstat *STps;
2624 int fileno, blkno, at_sm, undone;
2625 int datalen = 0, direction = DMA_NONE;
2626 char *name = tape_name(STp);
2627
2628 WARN_ON(STp->buffer->do_dio != 0);
2629 if (STp->ready != ST_READY) {
2630 if (STp->ready == ST_NO_TAPE)
2631 return (-ENOMEDIUM);
2632 else
2633 return (-EIO);
2634 }
2635 timeout = STp->long_timeout;
2636 STps = &(STp->ps[STp->partition]);
2637 fileno = STps->drv_file;
2638 blkno = STps->drv_block;
2639 at_sm = STps->at_sm;
2640
2641 memset(cmd, 0, MAX_COMMAND_SIZE);
2642 switch (cmd_in) {
2643 case MTFSFM:
2644 chg_eof = 0; /* Changed from the FSF after this */
2645 case MTFSF:
2646 cmd[0] = SPACE;
2647 cmd[1] = 0x01; /* Space FileMarks */
2648 cmd[2] = (arg >> 16);
2649 cmd[3] = (arg >> 8);
2650 cmd[4] = arg;
2651 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2652 if (fileno >= 0)
2653 fileno += arg;
2654 blkno = 0;
2655 at_sm &= (arg == 0);
2656 break;
2657 case MTBSFM:
2658 chg_eof = 0; /* Changed from the FSF after this */
2659 case MTBSF:
2660 cmd[0] = SPACE;
2661 cmd[1] = 0x01; /* Space FileMarks */
2662 ltmp = (-arg);
2663 cmd[2] = (ltmp >> 16);
2664 cmd[3] = (ltmp >> 8);
2665 cmd[4] = ltmp;
2666 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2667 if (fileno >= 0)
2668 fileno -= arg;
2669 blkno = (-1); /* We can't know the block number */
2670 at_sm &= (arg == 0);
2671 break;
2672 case MTFSR:
2673 cmd[0] = SPACE;
2674 cmd[1] = 0x00; /* Space Blocks */
2675 cmd[2] = (arg >> 16);
2676 cmd[3] = (arg >> 8);
2677 cmd[4] = arg;
2678 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2679 if (blkno >= 0)
2680 blkno += arg;
2681 at_sm &= (arg == 0);
2682 break;
2683 case MTBSR:
2684 cmd[0] = SPACE;
2685 cmd[1] = 0x00; /* Space Blocks */
2686 ltmp = (-arg);
2687 cmd[2] = (ltmp >> 16);
2688 cmd[3] = (ltmp >> 8);
2689 cmd[4] = ltmp;
2690 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
2691 if (blkno >= 0)
2692 blkno -= arg;
2693 at_sm &= (arg == 0);
2694 break;
2695 case MTFSS:
2696 cmd[0] = SPACE;
2697 cmd[1] = 0x04; /* Space Setmarks */
2698 cmd[2] = (arg >> 16);
2699 cmd[3] = (arg >> 8);
2700 cmd[4] = arg;
2701 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2702 if (arg != 0) {
2703 blkno = fileno = (-1);
2704 at_sm = 1;
2705 }
2706 break;
2707 case MTBSS:
2708 cmd[0] = SPACE;
2709 cmd[1] = 0x04; /* Space Setmarks */
2710 ltmp = (-arg);
2711 cmd[2] = (ltmp >> 16);
2712 cmd[3] = (ltmp >> 8);
2713 cmd[4] = ltmp;
2714 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
2715 if (arg != 0) {
2716 blkno = fileno = (-1);
2717 at_sm = 1;
2718 }
2719 break;
2720 case MTWEOF:
2721 case MTWEOFI:
2722 case MTWSM:
2723 if (STp->write_prot)
2724 return (-EACCES);
2725 cmd[0] = WRITE_FILEMARKS;
2726 if (cmd_in == MTWSM)
2727 cmd[1] = 2;
2728 if (cmd_in == MTWEOFI ||
2729 (cmd_in == MTWEOF && STp->immediate_filemark))
2730 cmd[1] |= 1;
2731 cmd[2] = (arg >> 16);
2732 cmd[3] = (arg >> 8);
2733 cmd[4] = arg;
2734 timeout = STp->device->request_queue->rq_timeout;
2735 DEBC(
2736 if (cmd_in != MTWSM)
2737 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2738 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2739 else
2740 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2741 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2742 )
2743 if (fileno >= 0)
2744 fileno += arg;
2745 blkno = 0;
2746 at_sm = (cmd_in == MTWSM);
2747 break;
2748 case MTREW:
2749 cmd[0] = REZERO_UNIT;
2750 if (STp->immediate) {
2751 cmd[1] = 1; /* Don't wait for completion */
2752 timeout = STp->device->request_queue->rq_timeout;
2753 }
2754 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2755 fileno = blkno = at_sm = 0;
2756 break;
2757 case MTNOP:
2758 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2759 return 0; /* Should do something ? */
2760 break;
2761 case MTRETEN:
2762 cmd[0] = START_STOP;
2763 if (STp->immediate) {
2764 cmd[1] = 1; /* Don't wait for completion */
2765 timeout = STp->device->request_queue->rq_timeout;
2766 }
2767 cmd[4] = 3;
2768 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2769 fileno = blkno = at_sm = 0;
2770 break;
2771 case MTEOM:
2772 if (!STp->fast_mteom) {
2773 /* space to the end of tape */
2774 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2775 fileno = STps->drv_file;
2776 if (STps->eof >= ST_EOD_1)
2777 return 0;
2778 /* The next lines would hide the number of spaced FileMarks
2779 That's why I inserted the previous lines. I had no luck
2780 with detecting EOM with FSF, so we go now to EOM.
2781 Joerg Weule */
2782 } else
2783 fileno = (-1);
2784 cmd[0] = SPACE;
2785 cmd[1] = 3;
2786 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2787 name));
2788 blkno = -1;
2789 at_sm = 0;
2790 break;
2791 case MTERASE:
2792 if (STp->write_prot)
2793 return (-EACCES);
2794 cmd[0] = ERASE;
2795 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2796 if (STp->immediate) {
2797 cmd[1] |= 2; /* Don't wait for completion */
2798 timeout = STp->device->request_queue->rq_timeout;
2799 }
2800 else
2801 timeout = STp->long_timeout * 8;
2802
2803 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2804 fileno = blkno = at_sm = 0;
2805 break;
2806 case MTSETBLK: /* Set block length */
2807 case MTSETDENSITY: /* Set tape density */
2808 case MTSETDRVBUFFER: /* Set drive buffering */
2809 case SET_DENS_AND_BLK: /* Set density and block size */
2810 chg_eof = 0;
2811 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2812 return (-EIO); /* Not allowed if data in buffer */
2813 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2814 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2815 STp->max_block > 0 &&
2816 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2817 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2818 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2819 return (-EINVAL);
2820 }
2821 cmd[0] = MODE_SELECT;
2822 if ((STp->use_pf & USE_PF))
2823 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2824 cmd[4] = datalen = 12;
2825 direction = DMA_TO_DEVICE;
2826
2827 memset((STp->buffer)->b_data, 0, 12);
2828 if (cmd_in == MTSETDRVBUFFER)
2829 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2830 else
2831 (STp->buffer)->b_data[2] =
2832 STp->drv_buffer << 4;
2833 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2834 if (cmd_in == MTSETDENSITY) {
2835 (STp->buffer)->b_data[4] = arg;
2836 STp->density_changed = 1; /* At least we tried ;-) */
2837 } else if (cmd_in == SET_DENS_AND_BLK)
2838 (STp->buffer)->b_data[4] = arg >> 24;
2839 else
2840 (STp->buffer)->b_data[4] = STp->density;
2841 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2842 ltmp = arg & MT_ST_BLKSIZE_MASK;
2843 if (cmd_in == MTSETBLK)
2844 STp->blksize_changed = 1; /* At least we tried ;-) */
2845 } else
2846 ltmp = STp->block_size;
2847 (STp->buffer)->b_data[9] = (ltmp >> 16);
2848 (STp->buffer)->b_data[10] = (ltmp >> 8);
2849 (STp->buffer)->b_data[11] = ltmp;
2850 timeout = STp->device->request_queue->rq_timeout;
2851 DEBC(
2852 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2853 printk(ST_DEB_MSG
2854 "%s: Setting block size to %d bytes.\n", name,
2855 (STp->buffer)->b_data[9] * 65536 +
2856 (STp->buffer)->b_data[10] * 256 +
2857 (STp->buffer)->b_data[11]);
2858 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2859 printk(ST_DEB_MSG
2860 "%s: Setting density code to %x.\n", name,
2861 (STp->buffer)->b_data[4]);
2862 if (cmd_in == MTSETDRVBUFFER)
2863 printk(ST_DEB_MSG
2864 "%s: Setting drive buffer code to %d.\n", name,
2865 ((STp->buffer)->b_data[2] >> 4) & 7);
2866 )
2867 break;
2868 default:
2869 return (-ENOSYS);
2870 }
2871
2872 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2873 timeout, MAX_RETRIES, 1);
2874 if (!SRpnt)
2875 return (STp->buffer)->syscall_result;
2876
2877 ioctl_result = (STp->buffer)->syscall_result;
2878
2879 if (!ioctl_result) { /* SCSI command successful */
2880 st_release_request(SRpnt);
2881 SRpnt = NULL;
2882 STps->drv_block = blkno;
2883 STps->drv_file = fileno;
2884 STps->at_sm = at_sm;
2885
2886 if (cmd_in == MTBSFM)
2887 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2888 else if (cmd_in == MTFSFM)
2889 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2890
2891 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2892 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2893 if (STp->block_size != 0) {
2894 (STp->buffer)->buffer_blocks =
2895 (STp->buffer)->buffer_size / STp->block_size;
2896 }
2897 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2898 if (cmd_in == SET_DENS_AND_BLK)
2899 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2900 } else if (cmd_in == MTSETDRVBUFFER)
2901 STp->drv_buffer = (arg & 7);
2902 else if (cmd_in == MTSETDENSITY)
2903 STp->density = arg;
2904
2905 if (cmd_in == MTEOM)
2906 STps->eof = ST_EOD;
2907 else if (cmd_in == MTFSF)
2908 STps->eof = ST_FM;
2909 else if (chg_eof)
2910 STps->eof = ST_NOEOF;
2911
2912 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2913 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2914 } else { /* SCSI command was not completely successful. Don't return
2915 from this block without releasing the SCSI command block! */
2916 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2917
2918 if (cmdstatp->flags & SENSE_EOM) {
2919 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2920 cmd_in != MTBSR && cmd_in != MTBSS)
2921 STps->eof = ST_EOM_OK;
2922 STps->drv_block = 0;
2923 }
2924
2925 if (cmdstatp->remainder_valid)
2926 undone = (int)cmdstatp->uremainder64;
2927 else
2928 undone = 0;
2929
2930 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
2931 cmdstatp->have_sense &&
2932 (cmdstatp->flags & SENSE_EOM)) {
2933 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2934 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2935 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2936 STps->eof = ST_NOEOF;
2937 } else { /* Writing EOF(s) failed */
2938 if (fileno >= 0)
2939 fileno -= undone;
2940 if (undone < arg)
2941 STps->eof = ST_NOEOF;
2942 }
2943 STps->drv_file = fileno;
2944 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2945 if (fileno >= 0)
2946 STps->drv_file = fileno - undone;
2947 else
2948 STps->drv_file = fileno;
2949 STps->drv_block = -1;
2950 STps->eof = ST_NOEOF;
2951 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2952 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2953 undone = (-undone);
2954 if (STps->drv_file >= 0)
2955 STps->drv_file = fileno + undone;
2956 STps->drv_block = 0;
2957 STps->eof = ST_NOEOF;
2958 } else if (cmd_in == MTFSR) {
2959 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2960 if (STps->drv_file >= 0)
2961 STps->drv_file++;
2962 STps->drv_block = 0;
2963 STps->eof = ST_FM;
2964 } else {
2965 if (blkno >= undone)
2966 STps->drv_block = blkno - undone;
2967 else
2968 STps->drv_block = (-1);
2969 STps->eof = ST_NOEOF;
2970 }
2971 } else if (cmd_in == MTBSR) {
2972 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2973 STps->drv_file--;
2974 STps->drv_block = (-1);
2975 } else {
2976 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2977 undone = (-undone);
2978 if (STps->drv_block >= 0)
2979 STps->drv_block = blkno + undone;
2980 }
2981 STps->eof = ST_NOEOF;
2982 } else if (cmd_in == MTEOM) {
2983 STps->drv_file = (-1);
2984 STps->drv_block = (-1);
2985 STps->eof = ST_EOD;
2986 } else if (cmd_in == MTSETBLK ||
2987 cmd_in == MTSETDENSITY ||
2988 cmd_in == MTSETDRVBUFFER ||
2989 cmd_in == SET_DENS_AND_BLK) {
2990 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2991 !(STp->use_pf & PF_TESTED)) {
2992 /* Try the other possible state of Page Format if not
2993 already tried */
2994 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
2995 st_release_request(SRpnt);
2996 SRpnt = NULL;
2997 return st_int_ioctl(STp, cmd_in, arg);
2998 }
2999 } else if (chg_eof)
3000 STps->eof = ST_NOEOF;
3001
3002 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3003 STps->eof = ST_EOD;
3004
3005 st_release_request(SRpnt);
3006 SRpnt = NULL;
3007 }
3008
3009 return ioctl_result;
3010}
3011
3012
3013/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3014 structure. */
3015
3016static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3017 int logical)
3018{
3019 int result;
3020 unsigned char scmd[MAX_COMMAND_SIZE];
3021 struct st_request *SRpnt;
3022 DEB( char *name = tape_name(STp); )
3023
3024 if (STp->ready != ST_READY)
3025 return (-EIO);
3026
3027 memset(scmd, 0, MAX_COMMAND_SIZE);
3028 if ((STp->device)->scsi_level < SCSI_2) {
3029 scmd[0] = QFA_REQUEST_BLOCK;
3030 scmd[4] = 3;
3031 } else {
3032 scmd[0] = READ_POSITION;
3033 if (!logical && !STp->scsi2_logical)
3034 scmd[1] = 1;
3035 }
3036 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3037 STp->device->request_queue->rq_timeout,
3038 MAX_READY_RETRIES, 1);
3039 if (!SRpnt)
3040 return (STp->buffer)->syscall_result;
3041
3042 if ((STp->buffer)->syscall_result != 0 ||
3043 (STp->device->scsi_level >= SCSI_2 &&
3044 ((STp->buffer)->b_data[0] & 4) != 0)) {
3045 *block = *partition = 0;
3046 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3047 result = (-EIO);
3048 } else {
3049 result = 0;
3050 if ((STp->device)->scsi_level < SCSI_2) {
3051 *block = ((STp->buffer)->b_data[0] << 16)
3052 + ((STp->buffer)->b_data[1] << 8)
3053 + (STp->buffer)->b_data[2];
3054 *partition = 0;
3055 } else {
3056 *block = ((STp->buffer)->b_data[4] << 24)
3057 + ((STp->buffer)->b_data[5] << 16)
3058 + ((STp->buffer)->b_data[6] << 8)
3059 + (STp->buffer)->b_data[7];
3060 *partition = (STp->buffer)->b_data[1];
3061 if (((STp->buffer)->b_data[0] & 0x80) &&
3062 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3063 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3064 }
3065 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3066 *block, *partition));
3067 }
3068 st_release_request(SRpnt);
3069 SRpnt = NULL;
3070
3071 return result;
3072}
3073
3074
3075/* Set the tape block and partition. Negative partition means that only the
3076 block should be set in vendor specific way. */
3077static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3078 int logical)
3079{
3080 struct st_partstat *STps;
3081 int result, p;
3082 unsigned int blk;
3083 int timeout;
3084 unsigned char scmd[MAX_COMMAND_SIZE];
3085 struct st_request *SRpnt;
3086 DEB( char *name = tape_name(STp); )
3087
3088 if (STp->ready != ST_READY)
3089 return (-EIO);
3090 timeout = STp->long_timeout;
3091 STps = &(STp->ps[STp->partition]);
3092
3093 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3094 name, block, partition));
3095 DEB(if (partition < 0)
3096 return (-EIO); )
3097
3098 /* Update the location at the partition we are leaving */
3099 if ((!STp->can_partitions && partition != 0) ||
3100 partition >= ST_NBR_PARTITIONS)
3101 return (-EINVAL);
3102 if (partition != STp->partition) {
3103 if (get_location(STp, &blk, &p, 1))
3104 STps->last_block_valid = 0;
3105 else {
3106 STps->last_block_valid = 1;
3107 STps->last_block_visited = blk;
3108 DEBC(printk(ST_DEB_MSG
3109 "%s: Visited block %d for partition %d saved.\n",
3110 name, blk, STp->partition));
3111 }
3112 }
3113
3114 memset(scmd, 0, MAX_COMMAND_SIZE);
3115 if ((STp->device)->scsi_level < SCSI_2) {
3116 scmd[0] = QFA_SEEK_BLOCK;
3117 scmd[2] = (block >> 16);
3118 scmd[3] = (block >> 8);
3119 scmd[4] = block;
3120 scmd[5] = 0;
3121 } else {
3122 scmd[0] = SEEK_10;
3123 scmd[3] = (block >> 24);
3124 scmd[4] = (block >> 16);
3125 scmd[5] = (block >> 8);
3126 scmd[6] = block;
3127 if (!logical && !STp->scsi2_logical)
3128 scmd[1] = 4;
3129 if (STp->partition != partition) {
3130 scmd[1] |= 2;
3131 scmd[8] = partition;
3132 DEBC(printk(ST_DEB_MSG
3133 "%s: Trying to change partition from %d to %d\n",
3134 name, STp->partition, partition));
3135 }
3136 }
3137 if (STp->immediate) {
3138 scmd[1] |= 1; /* Don't wait for completion */
3139 timeout = STp->device->request_queue->rq_timeout;
3140 }
3141
3142 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3143 timeout, MAX_READY_RETRIES, 1);
3144 if (!SRpnt)
3145 return (STp->buffer)->syscall_result;
3146
3147 STps->drv_block = STps->drv_file = (-1);
3148 STps->eof = ST_NOEOF;
3149 if ((STp->buffer)->syscall_result != 0) {
3150 result = (-EIO);
3151 if (STp->can_partitions &&
3152 (STp->device)->scsi_level >= SCSI_2 &&
3153 (p = find_partition(STp)) >= 0)
3154 STp->partition = p;
3155 } else {
3156 if (STp->can_partitions) {
3157 STp->partition = partition;
3158 STps = &(STp->ps[partition]);
3159 if (!STps->last_block_valid ||
3160 STps->last_block_visited != block) {
3161 STps->at_sm = 0;
3162 STps->rw = ST_IDLE;
3163 }
3164 } else
3165 STps->at_sm = 0;
3166 if (block == 0)
3167 STps->drv_block = STps->drv_file = 0;
3168 result = 0;
3169 }
3170
3171 st_release_request(SRpnt);
3172 SRpnt = NULL;
3173
3174 return result;
3175}
3176
3177
3178/* Find the current partition number for the drive status. Called from open and
3179 returns either partition number of negative error code. */
3180static int find_partition(struct scsi_tape *STp)
3181{
3182 int i, partition;
3183 unsigned int block;
3184
3185 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3186 return i;
3187 if (partition >= ST_NBR_PARTITIONS)
3188 return (-EIO);
3189 return partition;
3190}
3191
3192
3193/* Change the partition if necessary */
3194static int switch_partition(struct scsi_tape *STp)
3195{
3196 struct st_partstat *STps;
3197
3198 if (STp->partition == STp->new_partition)
3199 return 0;
3200 STps = &(STp->ps[STp->new_partition]);
3201 if (!STps->last_block_valid)
3202 STps->last_block_visited = 0;
3203 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3204}
3205
3206/* Functions for reading and writing the medium partition mode page. */
3207
3208#define PART_PAGE 0x11
3209#define PART_PAGE_FIXED_LENGTH 8
3210
3211#define PP_OFF_MAX_ADD_PARTS 2
3212#define PP_OFF_NBR_ADD_PARTS 3
3213#define PP_OFF_FLAGS 4
3214#define PP_OFF_PART_UNITS 6
3215#define PP_OFF_RESERVED 7
3216
3217#define PP_BIT_IDP 0x20
3218#define PP_MSK_PSUM_MB 0x10
3219
3220/* Get the number of partitions on the tape. As a side effect reads the
3221 mode page into the tape buffer. */
3222static int nbr_partitions(struct scsi_tape *STp)
3223{
3224 int result;
3225 DEB( char *name = tape_name(STp); )
3226
3227 if (STp->ready != ST_READY)
3228 return (-EIO);
3229
3230 result = read_mode_page(STp, PART_PAGE, 1);
3231
3232 if (result) {
3233 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3234 name));
3235 result = (-EIO);
3236 } else {
3237 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3238 PP_OFF_NBR_ADD_PARTS] + 1;
3239 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3240 }
3241
3242 return result;
3243}
3244
3245
3246/* Partition the tape into two partitions if size > 0 or one partition if
3247 size == 0.
3248
3249 The block descriptors are read and written because Sony SDT-7000 does not
3250 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3251
3252 My HP C1533A drive returns only one partition size field. This is used to
3253 set the size of partition 1. There is no size field for the default partition.
3254 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3255 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3256 The following algorithm is used to accommodate both drives: if the number of
3257 partition size fields is greater than the maximum number of additional partitions
3258 in the mode page, the second field is used. Otherwise the first field is used.
3259
3260 For Seagate DDS drives the page length must be 8 when no partitions is defined
3261 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3262 is acceptable also to some other old drives and enforced if the first partition
3263 size field is used for the first additional partition size.
3264 */
3265static int partition_tape(struct scsi_tape *STp, int size)
3266{
3267 char *name = tape_name(STp);
3268 int result;
3269 int pgo, psd_cnt, psdo;
3270 unsigned char *bp;
3271
3272 result = read_mode_page(STp, PART_PAGE, 0);
3273 if (result) {
3274 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3275 return result;
3276 }
3277 /* The mode page is in the buffer. Let's modify it and write it. */
3278 bp = (STp->buffer)->b_data;
3279 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3280 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3281 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3282
3283 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3284 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3285 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3286 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3287 psdo += 2;
3288 }
3289 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3290
3291 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3292 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3293 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3294
3295 if (size <= 0) {
3296 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3297 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3298 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3299 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3300 name));
3301 } else {
3302 bp[psdo] = (size >> 8) & 0xff;
3303 bp[psdo + 1] = size & 0xff;
3304 bp[pgo + 3] = 1;
3305 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3306 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3307 DEBC(printk(ST_DEB_MSG
3308 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3309 name, size));
3310 }
3311 bp[pgo + PP_OFF_PART_UNITS] = 0;
3312 bp[pgo + PP_OFF_RESERVED] = 0;
3313 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3314
3315 result = write_mode_page(STp, PART_PAGE, 1);
3316 if (result) {
3317 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3318 result = (-EIO);
3319 }
3320
3321 return result;
3322}
3323
3324
3325
3326/* The ioctl command */
3327static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3328{
3329 int i, cmd_nr, cmd_type, bt;
3330 int retval = 0;
3331 unsigned int blk;
3332 struct scsi_tape *STp = file->private_data;
3333 struct st_modedef *STm;
3334 struct st_partstat *STps;
3335 char *name = tape_name(STp);
3336 void __user *p = (void __user *)arg;
3337
3338 if (mutex_lock_interruptible(&STp->lock))
3339 return -ERESTARTSYS;
3340
3341 DEB(
3342 if (debugging && !STp->in_use) {
3343 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3344 retval = (-EIO);
3345 goto out;
3346 } ) /* end DEB */
3347
3348 STm = &(STp->modes[STp->current_mode]);
3349 STps = &(STp->ps[STp->partition]);
3350
3351 /*
3352 * If we are in the middle of error recovery, don't let anyone
3353 * else try and use this device. Also, if error recovery fails, it
3354 * may try and take the device offline, in which case all further
3355 * access to the device is prohibited.
3356 */
3357 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3358 file->f_flags & O_NDELAY);
3359 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3360 goto out;
3361 retval = 0;
3362
3363 cmd_type = _IOC_TYPE(cmd_in);
3364 cmd_nr = _IOC_NR(cmd_in);
3365
3366 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3367 struct mtop mtc;
3368
3369 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3370 retval = (-EINVAL);
3371 goto out;
3372 }
3373
3374 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3375 if (i) {
3376 retval = (-EFAULT);
3377 goto out;
3378 }
3379
3380 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3381 printk(KERN_WARNING
3382 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3383 retval = (-EPERM);
3384 goto out;
3385 }
3386 if (!STm->defined &&
3387 (mtc.mt_op != MTSETDRVBUFFER &&
3388 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3389 retval = (-ENXIO);
3390 goto out;
3391 }
3392
3393 if (!STp->pos_unknown) {
3394
3395 if (STps->eof == ST_FM_HIT) {
3396 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3397 mtc.mt_op == MTEOM) {
3398 mtc.mt_count -= 1;
3399 if (STps->drv_file >= 0)
3400 STps->drv_file += 1;
3401 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3402 mtc.mt_count += 1;
3403 if (STps->drv_file >= 0)
3404 STps->drv_file += 1;
3405 }
3406 }
3407
3408 if (mtc.mt_op == MTSEEK) {
3409 /* Old position must be restored if partition will be
3410 changed */
3411 i = !STp->can_partitions ||
3412 (STp->new_partition != STp->partition);
3413 } else {
3414 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3415 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3416 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3417 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3418 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3419 mtc.mt_op == MTCOMPRESSION;
3420 }
3421 i = flush_buffer(STp, i);
3422 if (i < 0) {
3423 retval = i;
3424 goto out;
3425 }
3426 if (STps->rw == ST_WRITING &&
3427 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3428 mtc.mt_op == MTSEEK ||
3429 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3430 i = st_int_ioctl(STp, MTWEOF, 1);
3431 if (i < 0) {
3432 retval = i;
3433 goto out;
3434 }
3435 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3436 mtc.mt_count++;
3437 STps->rw = ST_IDLE;
3438 }
3439
3440 } else {
3441 /*
3442 * If there was a bus reset, block further access
3443 * to this device. If the user wants to rewind the tape,
3444 * then reset the flag and allow access again.
3445 */
3446 if (mtc.mt_op != MTREW &&
3447 mtc.mt_op != MTOFFL &&
3448 mtc.mt_op != MTRETEN &&
3449 mtc.mt_op != MTERASE &&
3450 mtc.mt_op != MTSEEK &&
3451 mtc.mt_op != MTEOM) {
3452 retval = (-EIO);
3453 goto out;
3454 }
3455 reset_state(STp);
3456 /* remove this when the midlevel properly clears was_reset */
3457 STp->device->was_reset = 0;
3458 }
3459
3460 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3461 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3462 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3463 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3464
3465 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3466 do_door_lock(STp, 0); /* Ignore result! */
3467
3468 if (mtc.mt_op == MTSETDRVBUFFER &&
3469 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3470 retval = st_set_options(STp, mtc.mt_count);
3471 goto out;
3472 }
3473
3474 if (mtc.mt_op == MTSETPART) {
3475 if (!STp->can_partitions ||
3476 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3477 retval = (-EINVAL);
3478 goto out;
3479 }
3480 if (mtc.mt_count >= STp->nbr_partitions &&
3481 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3482 retval = (-EIO);
3483 goto out;
3484 }
3485 if (mtc.mt_count >= STp->nbr_partitions) {
3486 retval = (-EINVAL);
3487 goto out;
3488 }
3489 STp->new_partition = mtc.mt_count;
3490 retval = 0;
3491 goto out;
3492 }
3493
3494 if (mtc.mt_op == MTMKPART) {
3495 if (!STp->can_partitions) {
3496 retval = (-EINVAL);
3497 goto out;
3498 }
3499 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3500 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3501 retval = i;
3502 goto out;
3503 }
3504 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3505 STp->ps[i].rw = ST_IDLE;
3506 STp->ps[i].at_sm = 0;
3507 STp->ps[i].last_block_valid = 0;
3508 }
3509 STp->partition = STp->new_partition = 0;
3510 STp->nbr_partitions = 1; /* Bad guess ?-) */
3511 STps->drv_block = STps->drv_file = 0;
3512 retval = 0;
3513 goto out;
3514 }
3515
3516 if (mtc.mt_op == MTSEEK) {
3517 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3518 if (!STp->can_partitions)
3519 STp->ps[0].rw = ST_IDLE;
3520 retval = i;
3521 goto out;
3522 }
3523
3524 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3525 retval = do_load_unload(STp, file, 0);
3526 goto out;
3527 }
3528
3529 if (mtc.mt_op == MTLOAD) {
3530 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3531 goto out;
3532 }
3533
3534 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3535 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3536 goto out;
3537 }
3538
3539 if (STp->can_partitions && STp->ready == ST_READY &&
3540 (i = switch_partition(STp)) < 0) {
3541 retval = i;
3542 goto out;
3543 }
3544
3545 if (mtc.mt_op == MTCOMPRESSION)
3546 retval = st_compression(STp, (mtc.mt_count & 1));
3547 else
3548 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3549 goto out;
3550 }
3551 if (!STm->defined) {
3552 retval = (-ENXIO);
3553 goto out;
3554 }
3555
3556 if ((i = flush_buffer(STp, 0)) < 0) {
3557 retval = i;
3558 goto out;
3559 }
3560 if (STp->can_partitions &&
3561 (i = switch_partition(STp)) < 0) {
3562 retval = i;
3563 goto out;
3564 }
3565
3566 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3567 struct mtget mt_status;
3568
3569 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3570 retval = (-EINVAL);
3571 goto out;
3572 }
3573
3574 mt_status.mt_type = STp->tape_type;
3575 mt_status.mt_dsreg =
3576 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3577 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3578 mt_status.mt_blkno = STps->drv_block;
3579 mt_status.mt_fileno = STps->drv_file;
3580 if (STp->block_size != 0) {
3581 if (STps->rw == ST_WRITING)
3582 mt_status.mt_blkno +=
3583 (STp->buffer)->buffer_bytes / STp->block_size;
3584 else if (STps->rw == ST_READING)
3585 mt_status.mt_blkno -=
3586 ((STp->buffer)->buffer_bytes +
3587 STp->block_size - 1) / STp->block_size;
3588 }
3589
3590 mt_status.mt_gstat = 0;
3591 if (STp->drv_write_prot)
3592 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3593 if (mt_status.mt_blkno == 0) {
3594 if (mt_status.mt_fileno == 0)
3595 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3596 else
3597 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3598 }
3599 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3600 mt_status.mt_resid = STp->partition;
3601 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3602 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3603 else if (STps->eof >= ST_EOM_OK)
3604 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3605 if (STp->density == 1)
3606 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3607 else if (STp->density == 2)
3608 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3609 else if (STp->density == 3)
3610 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3611 if (STp->ready == ST_READY)
3612 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3613 if (STp->ready == ST_NO_TAPE)
3614 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3615 if (STps->at_sm)
3616 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3617 if (STm->do_async_writes ||
3618 (STm->do_buffer_writes && STp->block_size != 0) ||
3619 STp->drv_buffer != 0)
3620 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3621 if (STp->cleaning_req)
3622 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3623
3624 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3625 if (i) {
3626 retval = (-EFAULT);
3627 goto out;
3628 }
3629
3630 STp->recover_reg = 0; /* Clear after read */
3631 retval = 0;
3632 goto out;
3633 } /* End of MTIOCGET */
3634 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3635 struct mtpos mt_pos;
3636 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3637 retval = (-EINVAL);
3638 goto out;
3639 }
3640 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3641 retval = i;
3642 goto out;
3643 }
3644 mt_pos.mt_blkno = blk;
3645 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3646 if (i)
3647 retval = (-EFAULT);
3648 goto out;
3649 }
3650 mutex_unlock(&STp->lock);
3651 switch (cmd_in) {
3652 case SCSI_IOCTL_GET_IDLUN:
3653 case SCSI_IOCTL_GET_BUS_NUMBER:
3654 break;
3655 default:
3656 if ((cmd_in == SG_IO ||
3657 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3658 cmd_in == CDROM_SEND_PACKET) &&
3659 !capable(CAP_SYS_RAWIO))
3660 i = -EPERM;
3661 else
3662 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3663 file->f_mode, cmd_in, p);
3664 if (i != -ENOTTY)
3665 return i;
3666 break;
3667 }
3668 retval = scsi_ioctl(STp->device, cmd_in, p);
3669 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3670 STp->rew_at_close = 0;
3671 STp->ready = ST_NO_TAPE;
3672 }
3673 return retval;
3674
3675 out:
3676 mutex_unlock(&STp->lock);
3677 return retval;
3678}
3679
3680#ifdef CONFIG_COMPAT
3681static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3682{
3683 struct scsi_tape *STp = file->private_data;
3684 struct scsi_device *sdev = STp->device;
3685 int ret = -ENOIOCTLCMD;
3686 if (sdev->host->hostt->compat_ioctl) {
3687
3688 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3689
3690 }
3691 return ret;
3692}
3693#endif
3694
3695
3696
3697/* Try to allocate a new tape buffer. Calling function must not hold
3698 dev_arr_lock. */
3699static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3700{
3701 struct st_buffer *tb;
3702
3703 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3704 if (!tb) {
3705 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3706 return NULL;
3707 }
3708 tb->frp_segs = 0;
3709 tb->use_sg = max_sg;
3710 tb->dma = need_dma;
3711 tb->buffer_size = 0;
3712
3713 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3714 GFP_ATOMIC);
3715 if (!tb->reserved_pages) {
3716 kfree(tb);
3717 return NULL;
3718 }
3719
3720 return tb;
3721}
3722
3723
3724/* Try to allocate enough space in the tape buffer */
3725#define ST_MAX_ORDER 6
3726
3727static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3728{
3729 int segs, max_segs, b_size, order, got;
3730 gfp_t priority;
3731
3732 if (new_size <= STbuffer->buffer_size)
3733 return 1;
3734
3735 if (STbuffer->buffer_size <= PAGE_SIZE)
3736 normalize_buffer(STbuffer); /* Avoid extra segment */
3737
3738 max_segs = STbuffer->use_sg;
3739
3740 priority = GFP_KERNEL | __GFP_NOWARN;
3741 if (need_dma)
3742 priority |= GFP_DMA;
3743
3744 if (STbuffer->cleared)
3745 priority |= __GFP_ZERO;
3746
3747 if (STbuffer->frp_segs) {
3748 order = STbuffer->reserved_page_order;
3749 b_size = PAGE_SIZE << order;
3750 } else {
3751 for (b_size = PAGE_SIZE, order = 0;
3752 order < ST_MAX_ORDER &&
3753 max_segs * (PAGE_SIZE << order) < new_size;
3754 order++, b_size *= 2)
3755 ; /* empty */
3756 STbuffer->reserved_page_order = order;
3757 }
3758 if (max_segs * (PAGE_SIZE << order) < new_size) {
3759 if (order == ST_MAX_ORDER)
3760 return 0;
3761 normalize_buffer(STbuffer);
3762 return enlarge_buffer(STbuffer, new_size, need_dma);
3763 }
3764
3765 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3766 segs < max_segs && got < new_size;) {
3767 struct page *page;
3768
3769 page = alloc_pages(priority, order);
3770 if (!page) {
3771 DEB(STbuffer->buffer_size = got);
3772 normalize_buffer(STbuffer);
3773 return 0;
3774 }
3775
3776 STbuffer->frp_segs += 1;
3777 got += b_size;
3778 STbuffer->buffer_size = got;
3779 STbuffer->reserved_pages[segs] = page;
3780 segs++;
3781 }
3782 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3783
3784 return 1;
3785}
3786
3787
3788/* Make sure that no data from previous user is in the internal buffer */
3789static void clear_buffer(struct st_buffer * st_bp)
3790{
3791 int i;
3792
3793 for (i=0; i < st_bp->frp_segs; i++)
3794 memset(page_address(st_bp->reserved_pages[i]), 0,
3795 PAGE_SIZE << st_bp->reserved_page_order);
3796 st_bp->cleared = 1;
3797}
3798
3799
3800/* Release the extra buffer */
3801static void normalize_buffer(struct st_buffer * STbuffer)
3802{
3803 int i, order = STbuffer->reserved_page_order;
3804
3805 for (i = 0; i < STbuffer->frp_segs; i++) {
3806 __free_pages(STbuffer->reserved_pages[i], order);
3807 STbuffer->buffer_size -= (PAGE_SIZE << order);
3808 }
3809 STbuffer->frp_segs = 0;
3810 STbuffer->sg_segs = 0;
3811 STbuffer->reserved_page_order = 0;
3812 STbuffer->map_data.offset = 0;
3813}
3814
3815
3816/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3817 negative error code. */
3818static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3819{
3820 int i, cnt, res, offset;
3821 int length = PAGE_SIZE << st_bp->reserved_page_order;
3822
3823 for (i = 0, offset = st_bp->buffer_bytes;
3824 i < st_bp->frp_segs && offset >= length; i++)
3825 offset -= length;
3826 if (i == st_bp->frp_segs) { /* Should never happen */
3827 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3828 return (-EIO);
3829 }
3830 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3831 struct page *page = st_bp->reserved_pages[i];
3832 cnt = length - offset < do_count ? length - offset : do_count;
3833 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3834 if (res)
3835 return (-EFAULT);
3836 do_count -= cnt;
3837 st_bp->buffer_bytes += cnt;
3838 ubp += cnt;
3839 offset = 0;
3840 }
3841 if (do_count) /* Should never happen */
3842 return (-EIO);
3843
3844 return 0;
3845}
3846
3847
3848/* Move data from the tape buffer to the user buffer. Returns zero (success) or
3849 negative error code. */
3850static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3851{
3852 int i, cnt, res, offset;
3853 int length = PAGE_SIZE << st_bp->reserved_page_order;
3854
3855 for (i = 0, offset = st_bp->read_pointer;
3856 i < st_bp->frp_segs && offset >= length; i++)
3857 offset -= length;
3858 if (i == st_bp->frp_segs) { /* Should never happen */
3859 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3860 return (-EIO);
3861 }
3862 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3863 struct page *page = st_bp->reserved_pages[i];
3864 cnt = length - offset < do_count ? length - offset : do_count;
3865 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3866 if (res)
3867 return (-EFAULT);
3868 do_count -= cnt;
3869 st_bp->buffer_bytes -= cnt;
3870 st_bp->read_pointer += cnt;
3871 ubp += cnt;
3872 offset = 0;
3873 }
3874 if (do_count) /* Should never happen */
3875 return (-EIO);
3876
3877 return 0;
3878}
3879
3880
3881/* Move data towards start of buffer */
3882static void move_buffer_data(struct st_buffer * st_bp, int offset)
3883{
3884 int src_seg, dst_seg, src_offset = 0, dst_offset;
3885 int count, total;
3886 int length = PAGE_SIZE << st_bp->reserved_page_order;
3887
3888 if (offset == 0)
3889 return;
3890
3891 total=st_bp->buffer_bytes - offset;
3892 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3893 src_offset = offset;
3894 if (src_offset < length)
3895 break;
3896 offset -= length;
3897 }
3898
3899 st_bp->buffer_bytes = st_bp->read_pointer = total;
3900 for (dst_seg=dst_offset=0; total > 0; ) {
3901 struct page *dpage = st_bp->reserved_pages[dst_seg];
3902 struct page *spage = st_bp->reserved_pages[src_seg];
3903
3904 count = min(length - dst_offset, length - src_offset);
3905 memmove(page_address(dpage) + dst_offset,
3906 page_address(spage) + src_offset, count);
3907 src_offset += count;
3908 if (src_offset >= length) {
3909 src_seg++;
3910 src_offset = 0;
3911 }
3912 dst_offset += count;
3913 if (dst_offset >= length) {
3914 dst_seg++;
3915 dst_offset = 0;
3916 }
3917 total -= count;
3918 }
3919}
3920
3921/* Validate the options from command line or module parameters */
3922static void validate_options(void)
3923{
3924 if (buffer_kbs > 0)
3925 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3926 if (max_sg_segs >= ST_FIRST_SG)
3927 st_max_sg_segs = max_sg_segs;
3928}
3929
3930#ifndef MODULE
3931/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3932 */
3933static int __init st_setup(char *str)
3934{
3935 int i, len, ints[5];
3936 char *stp;
3937
3938 stp = get_options(str, ARRAY_SIZE(ints), ints);
3939
3940 if (ints[0] > 0) {
3941 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3942 if (parms[i].val)
3943 *parms[i].val = ints[i + 1];
3944 } else {
3945 while (stp != NULL) {
3946 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3947 len = strlen(parms[i].name);
3948 if (!strncmp(stp, parms[i].name, len) &&
3949 (*(stp + len) == ':' || *(stp + len) == '=')) {
3950 if (parms[i].val)
3951 *parms[i].val =
3952 simple_strtoul(stp + len + 1, NULL, 0);
3953 else
3954 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3955 parms[i].name);
3956 break;
3957 }
3958 }
3959 if (i >= ARRAY_SIZE(parms))
3960 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3961 stp);
3962 stp = strchr(stp, ',');
3963 if (stp)
3964 stp++;
3965 }
3966 }
3967
3968 validate_options();
3969
3970 return 1;
3971}
3972
3973__setup("st=", st_setup);
3974
3975#endif
3976
3977static const struct file_operations st_fops =
3978{
3979 .owner = THIS_MODULE,
3980 .read = st_read,
3981 .write = st_write,
3982 .unlocked_ioctl = st_ioctl,
3983#ifdef CONFIG_COMPAT
3984 .compat_ioctl = st_compat_ioctl,
3985#endif
3986 .open = st_open,
3987 .flush = st_flush,
3988 .release = st_release,
3989 .llseek = noop_llseek,
3990};
3991
3992static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
3993{
3994 int i, error;
3995 dev_t cdev_devno;
3996 struct cdev *cdev;
3997 struct device *dev;
3998 struct st_modedef *STm = &(tape->modes[mode]);
3999 char name[10];
4000 int dev_num = tape->index;
4001
4002 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4003
4004 cdev = cdev_alloc();
4005 if (!cdev) {
4006 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4007 error = -ENOMEM;
4008 goto out;
4009 }
4010 cdev->owner = THIS_MODULE;
4011 cdev->ops = &st_fops;
4012
4013 error = cdev_add(cdev, cdev_devno, 1);
4014 if (error) {
4015 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4016 rew ? "non" : "auto", mode);
4017 pr_err("st%d: Device not attached.\n", dev_num);
4018 goto out_free;
4019 }
4020 STm->cdevs[rew] = cdev;
4021
4022 i = mode << (4 - ST_NBR_MODE_BITS);
4023 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4024 tape->disk->disk_name, st_formats[i]);
4025
4026 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4027 cdev_devno, &tape->modes[mode], "%s", name);
4028 if (IS_ERR(dev)) {
4029 pr_err("st%d: device_create failed\n", dev_num);
4030 error = PTR_ERR(dev);
4031 goto out_free;
4032 }
4033
4034 STm->devs[rew] = dev;
4035
4036 return 0;
4037out_free:
4038 cdev_del(STm->cdevs[rew]);
4039 STm->cdevs[rew] = NULL;
4040out:
4041 return error;
4042}
4043
4044static int create_cdevs(struct scsi_tape *tape)
4045{
4046 int mode, error;
4047 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4048 error = create_one_cdev(tape, mode, 0);
4049 if (error)
4050 return error;
4051 error = create_one_cdev(tape, mode, 1);
4052 if (error)
4053 return error;
4054 }
4055
4056 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4057 &tape->modes[0].devs[0]->kobj, "tape");
4058}
4059
4060static void remove_cdevs(struct scsi_tape *tape)
4061{
4062 int mode, rew;
4063 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4064 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4065 struct st_modedef *STm = &(tape->modes[mode]);
4066 for (rew = 0; rew < 2; rew++) {
4067 if (STm->cdevs[rew])
4068 cdev_del(STm->cdevs[rew]);
4069 if (STm->devs[rew])
4070 device_unregister(STm->devs[rew]);
4071 }
4072 }
4073}
4074
4075static int st_probe(struct device *dev)
4076{
4077 struct scsi_device *SDp = to_scsi_device(dev);
4078 struct gendisk *disk = NULL;
4079 struct scsi_tape *tpnt = NULL;
4080 struct st_modedef *STm;
4081 struct st_partstat *STps;
4082 struct st_buffer *buffer;
4083 int i, error;
4084 char *stp;
4085
4086 if (SDp->type != TYPE_TAPE)
4087 return -ENODEV;
4088 if ((stp = st_incompatible(SDp))) {
4089 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4090 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
4091 return -ENODEV;
4092 }
4093
4094 i = queue_max_segments(SDp->request_queue);
4095 if (st_max_sg_segs < i)
4096 i = st_max_sg_segs;
4097 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4098 if (buffer == NULL) {
4099 printk(KERN_ERR
4100 "st: Can't allocate new tape buffer. Device not attached.\n");
4101 goto out;
4102 }
4103
4104 disk = alloc_disk(1);
4105 if (!disk) {
4106 printk(KERN_ERR "st: out of memory. Device not attached.\n");
4107 goto out_buffer_free;
4108 }
4109
4110 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4111 if (tpnt == NULL) {
4112 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4113 goto out_put_disk;
4114 }
4115 kref_init(&tpnt->kref);
4116 tpnt->disk = disk;
4117 disk->private_data = &tpnt->driver;
4118 disk->queue = SDp->request_queue;
4119 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4120 * take queue reference that release_disk() expects. */
4121 if (!blk_get_queue(disk->queue))
4122 goto out_put_disk;
4123 tpnt->driver = &st_template;
4124
4125 tpnt->device = SDp;
4126 if (SDp->scsi_level <= 2)
4127 tpnt->tape_type = MT_ISSCSI1;
4128 else
4129 tpnt->tape_type = MT_ISSCSI2;
4130
4131 tpnt->buffer = buffer;
4132 tpnt->buffer->last_SRpnt = NULL;
4133
4134 tpnt->inited = 0;
4135 tpnt->dirty = 0;
4136 tpnt->in_use = 0;
4137 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4138 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4139 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4140 tpnt->density = 0;
4141 tpnt->do_auto_lock = ST_AUTO_LOCK;
4142 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4143 tpnt->can_partitions = 0;
4144 tpnt->two_fm = ST_TWO_FM;
4145 tpnt->fast_mteom = ST_FAST_MTEOM;
4146 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4147 tpnt->sili = ST_SILI;
4148 tpnt->immediate = ST_NOWAIT;
4149 tpnt->immediate_filemark = 0;
4150 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4151 tpnt->partition = 0;
4152 tpnt->new_partition = 0;
4153 tpnt->nbr_partitions = 0;
4154 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4155 tpnt->long_timeout = ST_LONG_TIMEOUT;
4156 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4157
4158 for (i = 0; i < ST_NBR_MODES; i++) {
4159 STm = &(tpnt->modes[i]);
4160 STm->defined = 0;
4161 STm->sysv = ST_SYSV;
4162 STm->defaults_for_writes = 0;
4163 STm->do_async_writes = ST_ASYNC_WRITES;
4164 STm->do_buffer_writes = ST_BUFFER_WRITES;
4165 STm->do_read_ahead = ST_READ_AHEAD;
4166 STm->default_compression = ST_DONT_TOUCH;
4167 STm->default_blksize = (-1); /* No forced size */
4168 STm->default_density = (-1); /* No forced density */
4169 STm->tape = tpnt;
4170 }
4171
4172 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4173 STps = &(tpnt->ps[i]);
4174 STps->rw = ST_IDLE;
4175 STps->eof = ST_NOEOF;
4176 STps->at_sm = 0;
4177 STps->last_block_valid = 0;
4178 STps->drv_block = (-1);
4179 STps->drv_file = (-1);
4180 }
4181
4182 tpnt->current_mode = 0;
4183 tpnt->modes[0].defined = 1;
4184
4185 tpnt->density_changed = tpnt->compression_changed =
4186 tpnt->blksize_changed = 0;
4187 mutex_init(&tpnt->lock);
4188
4189 idr_preload(GFP_KERNEL);
4190 spin_lock(&st_index_lock);
4191 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4192 spin_unlock(&st_index_lock);
4193 idr_preload_end();
4194 if (error < 0) {
4195 pr_warn("st: idr allocation failed: %d\n", error);
4196 goto out_put_queue;
4197 }
4198 tpnt->index = error;
4199 sprintf(disk->disk_name, "st%d", tpnt->index);
4200
4201 dev_set_drvdata(dev, tpnt);
4202
4203
4204 error = create_cdevs(tpnt);
4205 if (error)
4206 goto out_remove_devs;
4207 scsi_autopm_put_device(SDp);
4208
4209 sdev_printk(KERN_NOTICE, SDp,
4210 "Attached scsi tape %s\n", tape_name(tpnt));
4211 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4212 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4213 queue_dma_alignment(SDp->request_queue) + 1);
4214
4215 return 0;
4216
4217out_remove_devs:
4218 remove_cdevs(tpnt);
4219 spin_lock(&st_index_lock);
4220 idr_remove(&st_index_idr, tpnt->index);
4221 spin_unlock(&st_index_lock);
4222out_put_queue:
4223 blk_put_queue(disk->queue);
4224out_put_disk:
4225 put_disk(disk);
4226 kfree(tpnt);
4227out_buffer_free:
4228 kfree(buffer);
4229out:
4230 return -ENODEV;
4231};
4232
4233
4234static int st_remove(struct device *dev)
4235{
4236 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4237 int index = tpnt->index;
4238
4239 scsi_autopm_get_device(to_scsi_device(dev));
4240 remove_cdevs(tpnt);
4241
4242 mutex_lock(&st_ref_mutex);
4243 kref_put(&tpnt->kref, scsi_tape_release);
4244 mutex_unlock(&st_ref_mutex);
4245 spin_lock(&st_index_lock);
4246 idr_remove(&st_index_idr, index);
4247 spin_unlock(&st_index_lock);
4248 return 0;
4249}
4250
4251/**
4252 * scsi_tape_release - Called to free the Scsi_Tape structure
4253 * @kref: pointer to embedded kref
4254 *
4255 * st_ref_mutex must be held entering this routine. Because it is
4256 * called on last put, you should always use the scsi_tape_get()
4257 * scsi_tape_put() helpers which manipulate the semaphore directly
4258 * and never do a direct kref_put().
4259 **/
4260static void scsi_tape_release(struct kref *kref)
4261{
4262 struct scsi_tape *tpnt = to_scsi_tape(kref);
4263 struct gendisk *disk = tpnt->disk;
4264
4265 tpnt->device = NULL;
4266
4267 if (tpnt->buffer) {
4268 normalize_buffer(tpnt->buffer);
4269 kfree(tpnt->buffer->reserved_pages);
4270 kfree(tpnt->buffer);
4271 }
4272
4273 disk->private_data = NULL;
4274 put_disk(disk);
4275 kfree(tpnt);
4276 return;
4277}
4278
4279static struct class st_sysfs_class = {
4280 .name = "scsi_tape",
4281 .dev_groups = st_dev_groups,
4282};
4283
4284static int __init init_st(void)
4285{
4286 int err;
4287
4288 validate_options();
4289
4290 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4291 verstr, st_fixed_buffer_size, st_max_sg_segs);
4292
4293 err = class_register(&st_sysfs_class);
4294 if (err) {
4295 pr_err("Unable register sysfs class for SCSI tapes\n");
4296 return err;
4297 }
4298
4299 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4300 ST_MAX_TAPE_ENTRIES, "st");
4301 if (err) {
4302 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4303 SCSI_TAPE_MAJOR);
4304 goto err_class;
4305 }
4306
4307 err = scsi_register_driver(&st_template.gendrv);
4308 if (err)
4309 goto err_chrdev;
4310
4311 err = do_create_sysfs_files();
4312 if (err)
4313 goto err_scsidrv;
4314
4315 return 0;
4316
4317err_scsidrv:
4318 scsi_unregister_driver(&st_template.gendrv);
4319err_chrdev:
4320 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4321 ST_MAX_TAPE_ENTRIES);
4322err_class:
4323 class_unregister(&st_sysfs_class);
4324 return err;
4325}
4326
4327static void __exit exit_st(void)
4328{
4329 do_remove_sysfs_files();
4330 scsi_unregister_driver(&st_template.gendrv);
4331 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4332 ST_MAX_TAPE_ENTRIES);
4333 class_unregister(&st_sysfs_class);
4334 printk(KERN_INFO "st: Unloaded.\n");
4335}
4336
4337module_init(init_st);
4338module_exit(exit_st);
4339
4340
4341/* The sysfs driver interface. Read-only at the moment */
4342static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4343{
4344 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4345}
4346static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4347
4348static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4349{
4350 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4351}
4352static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4353
4354static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4355{
4356 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4357}
4358static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4359
4360static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4361{
4362 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4363}
4364static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4365
4366static int do_create_sysfs_files(void)
4367{
4368 struct device_driver *sysfs = &st_template.gendrv;
4369 int err;
4370
4371 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4372 if (err)
4373 return err;
4374 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4375 if (err)
4376 goto err_try_direct_io;
4377 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4378 if (err)
4379 goto err_attr_fixed_buf;
4380 err = driver_create_file(sysfs, &driver_attr_version);
4381 if (err)
4382 goto err_attr_max_sg;
4383
4384 return 0;
4385
4386err_attr_max_sg:
4387 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4388err_attr_fixed_buf:
4389 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4390err_try_direct_io:
4391 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4392 return err;
4393}
4394
4395static void do_remove_sysfs_files(void)
4396{
4397 struct device_driver *sysfs = &st_template.gendrv;
4398
4399 driver_remove_file(sysfs, &driver_attr_version);
4400 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4401 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4402 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4403}
4404
4405/* The sysfs simple class interface */
4406static ssize_t
4407defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4408{
4409 struct st_modedef *STm = dev_get_drvdata(dev);
4410 ssize_t l = 0;
4411
4412 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4413 return l;
4414}
4415static DEVICE_ATTR_RO(defined);
4416
4417static ssize_t
4418default_blksize_show(struct device *dev, struct device_attribute *attr,
4419 char *buf)
4420{
4421 struct st_modedef *STm = dev_get_drvdata(dev);
4422 ssize_t l = 0;
4423
4424 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4425 return l;
4426}
4427static DEVICE_ATTR_RO(default_blksize);
4428
4429static ssize_t
4430default_density_show(struct device *dev, struct device_attribute *attr,
4431 char *buf)
4432{
4433 struct st_modedef *STm = dev_get_drvdata(dev);
4434 ssize_t l = 0;
4435 char *fmt;
4436
4437 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4438 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4439 return l;
4440}
4441static DEVICE_ATTR_RO(default_density);
4442
4443static ssize_t
4444default_compression_show(struct device *dev, struct device_attribute *attr,
4445 char *buf)
4446{
4447 struct st_modedef *STm = dev_get_drvdata(dev);
4448 ssize_t l = 0;
4449
4450 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4451 return l;
4452}
4453static DEVICE_ATTR_RO(default_compression);
4454
4455static ssize_t
4456options_show(struct device *dev, struct device_attribute *attr, char *buf)
4457{
4458 struct st_modedef *STm = dev_get_drvdata(dev);
4459 struct scsi_tape *STp = STm->tape;
4460 int options;
4461 ssize_t l = 0;
4462
4463 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4464 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4465 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4466 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4467 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4468 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4469 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4470 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4471 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4472 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4473 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4474 options |= STm->sysv ? MT_ST_SYSV : 0;
4475 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4476 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4477 options |= STp->sili ? MT_ST_SILI : 0;
4478
4479 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4480 return l;
4481}
4482static DEVICE_ATTR_RO(options);
4483
4484static struct attribute *st_dev_attrs[] = {
4485 &dev_attr_defined.attr,
4486 &dev_attr_default_blksize.attr,
4487 &dev_attr_default_density.attr,
4488 &dev_attr_default_compression.attr,
4489 &dev_attr_options.attr,
4490 NULL,
4491};
4492ATTRIBUTE_GROUPS(st_dev);
4493
4494/* The following functions may be useful for a larger audience. */
4495static int sgl_map_user_pages(struct st_buffer *STbp,
4496 const unsigned int max_pages, unsigned long uaddr,
4497 size_t count, int rw)
4498{
4499 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4500 unsigned long start = uaddr >> PAGE_SHIFT;
4501 const int nr_pages = end - start;
4502 int res, i, j;
4503 struct page **pages;
4504 struct rq_map_data *mdata = &STbp->map_data;
4505
4506 /* User attempted Overflow! */
4507 if ((uaddr + count) < uaddr)
4508 return -EINVAL;
4509
4510 /* Too big */
4511 if (nr_pages > max_pages)
4512 return -ENOMEM;
4513
4514 /* Hmm? */
4515 if (count == 0)
4516 return 0;
4517
4518 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4519 return -ENOMEM;
4520
4521 /* Try to fault in all of the necessary pages */
4522 down_read(¤t->mm->mmap_sem);
4523 /* rw==READ means read from drive, write into memory area */
4524 res = get_user_pages(
4525 current,
4526 current->mm,
4527 uaddr,
4528 nr_pages,
4529 rw == READ,
4530 0, /* don't force */
4531 pages,
4532 NULL);
4533 up_read(¤t->mm->mmap_sem);
4534
4535 /* Errors and no page mapped should return here */
4536 if (res < nr_pages)
4537 goto out_unmap;
4538
4539 for (i=0; i < nr_pages; i++) {
4540 /* FIXME: flush superflous for rw==READ,
4541 * probably wrong function for rw==WRITE
4542 */
4543 flush_dcache_page(pages[i]);
4544 }
4545
4546 mdata->offset = uaddr & ~PAGE_MASK;
4547 STbp->mapped_pages = pages;
4548
4549 return nr_pages;
4550 out_unmap:
4551 if (res > 0) {
4552 for (j=0; j < res; j++)
4553 page_cache_release(pages[j]);
4554 res = 0;
4555 }
4556 kfree(pages);
4557 return res;
4558}
4559
4560
4561/* And unmap them... */
4562static int sgl_unmap_user_pages(struct st_buffer *STbp,
4563 const unsigned int nr_pages, int dirtied)
4564{
4565 int i;
4566
4567 for (i=0; i < nr_pages; i++) {
4568 struct page *page = STbp->mapped_pages[i];
4569
4570 if (dirtied)
4571 SetPageDirty(page);
4572 /* FIXME: cache flush missing for rw==READ
4573 * FIXME: call the correct reference counting function
4574 */
4575 page_cache_release(page);
4576 }
4577 kfree(STbp->mapped_pages);
4578 STbp->mapped_pages = NULL;
4579
4580 return 0;
4581}