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[SCSI] st: convert check_tape to use st_scsi_kern_execute
[mirror_ubuntu-jammy-kernel.git] / drivers / scsi / st.c
CommitLineData
1da177e4
LT		 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
fd66c1b4 12 Copyright 1992 - 2008 Kai Makisara
1da177e4
LT		 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
626dcb1e 20static const char *verstr = "20080504";
1da177e4
LT		 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/errno.h>
31#include <linux/mtio.h>
16c4b3e2 32#include <linux/cdrom.h>
1da177e4
LT		 33#include <linux/ioctl.h>
34#include <linux/fcntl.h>
35#include <linux/spinlock.h>
36#include <linux/blkdev.h>
37#include <linux/moduleparam.h>
1da177e4
LT		 38#include <linux/cdev.h>
39#include <linux/delay.h>
0b950672 40#include <linux/mutex.h>
b3369c68 41#include <linux/smp_lock.h>
1da177e4
LT		 42
43#include <asm/uaccess.h>
44#include <asm/dma.h>
45#include <asm/system.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>
16c4b3e2 54#include <scsi/sg.h>
1da177e4
LT		 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 int st_dev_max;
85static int st_nr_dev;
86
d253878b 87static struct class *st_sysfs_class;
1da177e4
LT		 88
89MODULE_AUTHOR("Kai Makisara");
f018fa55 90MODULE_DESCRIPTION("SCSI tape (st) driver");
1da177e4 91MODULE_LICENSE("GPL");
f018fa55 92MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
d7b8bcb0 93MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
1da177e4
LT		 94
95/* Set 'perm' (4th argument) to 0 to disable module_param's definition
96 * of sysfs parameters (which module_param doesn't yet support).
97 * Sysfs parameters defined explicitly later.
98 */
99module_param_named(buffer_kbs, buffer_kbs, int, 0);
100MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
101module_param_named(max_sg_segs, max_sg_segs, int, 0);
102MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
103module_param_named(try_direct_io, try_direct_io, int, 0);
104MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
105
106/* Extra parameters for testing */
107module_param_named(try_rdio, try_rdio, int, 0);
108MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
109module_param_named(try_wdio, try_wdio, int, 0);
110MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
111
112#ifndef MODULE
113static int write_threshold_kbs; /* retained for compatibility */
114static struct st_dev_parm {
115 char *name;
116 int *val;
117} parms[] __initdata = {
118 {
119 "buffer_kbs", &buffer_kbs
120 },
121 { /* Retained for compatibility with 2.4 */
122 "write_threshold_kbs", &write_threshold_kbs
123 },
124 {
125 "max_sg_segs", NULL
126 },
127 {
128 "try_direct_io", &try_direct_io
129 }
130};
131#endif
132
133/* Restrict the number of modes so that names for all are assigned */
134#if ST_NBR_MODES > 16
135#error "Maximum number of modes is 16"
136#endif
137/* Bit reversed order to get same names for same minors with all
138 mode counts */
0ad78200 139static const char *st_formats[] = {
1da177e4
LT		 140 "", "r", "k", "s", "l", "t", "o", "u",
141 "m", "v", "p", "x", "a", "y", "q", "z"};
142
143/* The default definitions have been moved to st_options.h */
144
145#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
146
147/* The buffer size should fit into the 24 bits for length in the
148 6-byte SCSI read and write commands. */
149#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
150#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
151#endif
152
153static int debugging = DEBUG;
154
155#define MAX_RETRIES 0
156#define MAX_WRITE_RETRIES 0
157#define MAX_READY_RETRIES 0
158#define NO_TAPE NOT_READY
159
160#define ST_TIMEOUT (900 * HZ)
161#define ST_LONG_TIMEOUT (14000 * HZ)
162
163/* Remove mode bits and auto-rewind bit (7) */
164#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
165 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
166#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
167
168/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
169#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
170 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
171
172/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
173 24 bits) */
174#define SET_DENS_AND_BLK 0x10001
175
176static DEFINE_RWLOCK(st_dev_arr_lock);
177
178static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
179static int st_max_sg_segs = ST_MAX_SG;
180
181static struct scsi_tape **scsi_tapes = NULL;
182
183static int modes_defined;
184
185static struct st_buffer *new_tape_buffer(int, int, int);
186static int enlarge_buffer(struct st_buffer *, int, int);
40f6b36c 187static void clear_buffer(struct st_buffer *);
1da177e4
LT		 188static void normalize_buffer(struct st_buffer *);
189static int append_to_buffer(const char __user *, struct st_buffer *, int);
190static int from_buffer(struct st_buffer *, char __user *, int);
191static void move_buffer_data(struct st_buffer *, int);
192static void buf_to_sg(struct st_buffer *, unsigned int);
193
1da177e4
LT		 194static int sgl_map_user_pages(struct scatterlist *, const unsigned int,
195 unsigned long, size_t, int);
196static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
197
198static int st_probe(struct device *);
199static int st_remove(struct device *);
1da177e4 200
405ae7d3
RD		 201static int do_create_sysfs_files(void);
202static void do_remove_sysfs_files(void);
13026a6b 203static int do_create_class_files(struct scsi_tape *, int, int);
1da177e4
LT		 204
205static struct scsi_driver st_template = {
206 .owner = THIS_MODULE,
207 .gendrv = {
208 .name = "st",
209 .probe = st_probe,
210 .remove = st_remove,
211 },
1da177e4
LT		 212};
213
214static int st_compression(struct scsi_tape *, int);
215
216static int find_partition(struct scsi_tape *);
217static int switch_partition(struct scsi_tape *);
218
219static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
220
f03a5670
KM		 221static void scsi_tape_release(struct kref *);
222
223#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
224
0b950672 225static DEFINE_MUTEX(st_ref_mutex);
f03a5670 226
1da177e4
LT		 227\f
228#include "osst_detect.h"
229#ifndef SIGS_FROM_OSST
230#define SIGS_FROM_OSST \
231 {"OnStream", "SC-", "", "osst"}, \
232 {"OnStream", "DI-", "", "osst"}, \
233 {"OnStream", "DP-", "", "osst"}, \
234 {"OnStream", "USB", "", "osst"}, \
235 {"OnStream", "FW-", "", "osst"}
236#endif
237
f03a5670
KM		 238static struct scsi_tape *scsi_tape_get(int dev)
239{
240 struct scsi_tape *STp = NULL;
241
0b950672 242 mutex_lock(&st_ref_mutex);
f03a5670
KM		 243 write_lock(&st_dev_arr_lock);
244
245 if (dev < st_dev_max && scsi_tapes != NULL)
246 STp = scsi_tapes[dev];
247 if (!STp) goto out;
248
249 kref_get(&STp->kref);
250
251 if (!STp->device)
252 goto out_put;
253
254 if (scsi_device_get(STp->device))
255 goto out_put;
256
257 goto out;
258
259out_put:
260 kref_put(&STp->kref, scsi_tape_release);
261 STp = NULL;
262out:
263 write_unlock(&st_dev_arr_lock);
0b950672 264 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 265 return STp;
266}
267
268static void scsi_tape_put(struct scsi_tape *STp)
269{
270 struct scsi_device *sdev = STp->device;
271
0b950672 272 mutex_lock(&st_ref_mutex);
f03a5670
KM		 273 kref_put(&STp->kref, scsi_tape_release);
274 scsi_device_put(sdev);
0b950672 275 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 276}
277
1da177e4
LT		 278struct st_reject_data {
279 char *vendor;
280 char *model;
281 char *rev;
282 char *driver_hint; /* Name of the correct driver, NULL if unknown */
283};
284
285static struct st_reject_data reject_list[] = {
286 /* {"XXX", "Yy-", "", NULL}, example */
287 SIGS_FROM_OSST,
288 {NULL, }};
289
290/* If the device signature is on the list of incompatible drives, the
291 function returns a pointer to the name of the correct driver (if known) */
292static char * st_incompatible(struct scsi_device* SDp)
293{
294 struct st_reject_data *rp;
295
296 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
297 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
298 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
299 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
300 if (rp->driver_hint)
301 return rp->driver_hint;
302 else
303 return "unknown";
304 }
305 return NULL;
306}
307\f
308
309static inline char *tape_name(struct scsi_tape *tape)
310{
311 return tape->disk->disk_name;
312}
313
314
8b05b773 315static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
1da177e4
LT		 316{
317 const u8 *ucp;
8b05b773 318 const u8 *sense = SRpnt->sense;
1da177e4 319
8b05b773
MC		 320 s->have_sense = scsi_normalize_sense(SRpnt->sense,
321 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
1da177e4
LT		 322 s->flags = 0;
323
324 if (s->have_sense) {
325 s->deferred = 0;
326 s->remainder_valid =
327 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
328 switch (sense[0] & 0x7f) {
329 case 0x71:
330 s->deferred = 1;
331 case 0x70:
332 s->fixed_format = 1;
333 s->flags = sense[2] & 0xe0;
334 break;
335 case 0x73:
336 s->deferred = 1;
337 case 0x72:
338 s->fixed_format = 0;
339 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
340 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
341 break;
342 }
343 }
344}
345
346
347/* Convert the result to success code */
8b05b773 348static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
1da177e4 349{
8b05b773 350 int result = SRpnt->result;
1da177e4
LT		 351 u8 scode;
352 DEB(const char *stp;)
353 char *name = tape_name(STp);
354 struct st_cmdstatus *cmdstatp;
355
356 if (!result)
357 return 0;
358
359 cmdstatp = &STp->buffer->cmdstat;
f03a5670 360 st_analyze_sense(SRpnt, cmdstatp);
1da177e4
LT		 361
362 if (cmdstatp->have_sense)
363 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
364 else
365 scode = 0;
366
367 DEB(
368 if (debugging) {
8b05b773 369 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
1da177e4 370 name, result,
8b05b773
MC		 371 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
372 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
1da177e4 373 if (cmdstatp->have_sense)
4e73ea7b 374 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 375 } ) /* end DEB */
376 if (!debugging) { /* Abnormal conditions for tape */
377 if (!cmdstatp->have_sense)
378 printk(KERN_WARNING
379 "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
380 name, result, suggestion(result),
381 driver_byte(result) & DRIVER_MASK, host_byte(result));
382 else if (cmdstatp->have_sense &&
383 scode != NO_SENSE &&
384 scode != RECOVERED_ERROR &&
385 /* scode != UNIT_ATTENTION && */
386 scode != BLANK_CHECK &&
387 scode != VOLUME_OVERFLOW &&
8b05b773
MC		 388 SRpnt->cmd[0] != MODE_SENSE &&
389 SRpnt->cmd[0] != TEST_UNIT_READY) {
4e73ea7b
LT		 390
391 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 392 }
393 }
394
395 if (cmdstatp->fixed_format &&
396 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
397 if (STp->cln_sense_value)
8b05b773 398 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 399 STp->cln_sense_mask) == STp->cln_sense_value);
400 else
8b05b773 401 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 402 STp->cln_sense_mask) != 0);
403 }
404 if (cmdstatp->have_sense &&
405 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
406 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
407
408 STp->pos_unknown |= STp->device->was_reset;
409
410 if (cmdstatp->have_sense &&
411 scode == RECOVERED_ERROR
412#if ST_RECOVERED_WRITE_FATAL
8b05b773
MC		 413 && SRpnt->cmd[0] != WRITE_6
414 && SRpnt->cmd[0] != WRITE_FILEMARKS
1da177e4
LT		 415#endif
416 ) {
417 STp->recover_count++;
418 STp->recover_reg++;
419
420 DEB(
421 if (debugging) {
8b05b773 422 if (SRpnt->cmd[0] == READ_6)
1da177e4 423 stp = "read";
8b05b773 424 else if (SRpnt->cmd[0] == WRITE_6)
1da177e4
LT		 425 stp = "write";
426 else
427 stp = "ioctl";
428 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
429 STp->recover_count);
430 } ) /* end DEB */
431
432 if (cmdstatp->flags == 0)
433 return 0;
434 }
435 return (-EIO);
436}
437
438
439/* Wakeup from interrupt */
8b05b773 440static void st_sleep_done(void *data, char *sense, int result, int resid)
1da177e4 441{
8b05b773
MC		 442 struct st_request *SRpnt = data;
443 struct scsi_tape *STp = SRpnt->stp;
1da177e4 444
8b05b773
MC		 445 memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
446 (STp->buffer)->cmdstat.midlevel_result = SRpnt->result = result;
40f6b36c 447 (STp->buffer)->cmdstat.residual = resid;
1da177e4
LT		 448 DEB( STp->write_pending = 0; )
449
8b05b773
MC		 450 if (SRpnt->waiting)
451 complete(SRpnt->waiting);
452}
453
4deba245 454static struct st_request *st_allocate_request(struct scsi_tape *stp)
8b05b773 455{
4deba245
FT		 456 struct st_request *streq;
457
458 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
459 if (streq)
460 streq->stp = stp;
461 else {
462 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
463 tape_name(stp)););
464 if (signal_pending(current))
465 stp->buffer->syscall_result = -EINTR;
466 else
467 stp->buffer->syscall_result = -EBUSY;
468 }
469
470 return streq;
8b05b773
MC		 471}
472
473static void st_release_request(struct st_request *streq)
474{
475 kfree(streq);
1da177e4
LT		 476}
477
478/* Do the scsi command. Waits until command performed if do_wait is true.
479 Otherwise write_behind_check() is used to check that the command
480 has finished. */
8b05b773
MC		 481static struct st_request *
482st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 483 int bytes, int direction, int timeout, int retries, int do_wait)
484{
f03a5670 485 struct completion *waiting;
1da177e4 486
f03a5670
KM		 487 /* if async, make sure there's no command outstanding */
488 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
489 printk(KERN_ERR "%s: Async command already active.\n",
490 tape_name(STp));
491 if (signal_pending(current))
492 (STp->buffer)->syscall_result = (-EINTR);
493 else
494 (STp->buffer)->syscall_result = (-EBUSY);
495 return NULL;
496 }
497
4deba245
FT		 498 if (!SRpnt) {
499 SRpnt = st_allocate_request(STp);
500 if (!SRpnt)
1da177e4 501 return NULL;
1da177e4
LT		 502 }
503
f03a5670
KM		 504 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
505 which IO is outstanding. It's nulled out when the IO completes. */
506 if (!do_wait)
507 (STp->buffer)->last_SRpnt = SRpnt;
508
509 waiting = &STp->wait;
510 init_completion(waiting);
8b05b773 511 SRpnt->waiting = waiting;
1da177e4 512
8b05b773
MC		 513 if (!STp->buffer->do_dio)
514 buf_to_sg(STp->buffer, bytes);
1da177e4 515
8b05b773
MC		 516 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
517 STp->buffer->cmdstat.have_sense = 0;
518 STp->buffer->syscall_result = 0;
519
bb1d1073 520 if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction,
8b05b773 521 &((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
787926b1 522 timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL)) {
8b05b773
MC		 523 /* could not allocate the buffer or request was too large */
524 (STp->buffer)->syscall_result = (-EBUSY);
787926b1
KM		 525 (STp->buffer)->last_SRpnt = NULL;
526 }
8b05b773 527 else if (do_wait) {
f03a5670 528 wait_for_completion(waiting);
8b05b773 529 SRpnt->waiting = NULL;
1da177e4
LT		 530 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
531 }
8b05b773 532
1da177e4
LT		 533 return SRpnt;
534}
535
ffb43494
FT		 536static int st_scsi_kern_execute(struct st_request *streq,
537 const unsigned char *cmd, int data_direction,
538 void *buffer, unsigned bufflen, int timeout,
539 int retries)
540{
541 struct scsi_tape *stp = streq->stp;
542 int ret, resid;
543
544 stp->buffer->cmdstat.have_sense = 0;
545 memcpy(streq->cmd, cmd, sizeof(streq->cmd));
546
547 ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen,
548 streq->sense, timeout, retries, 0, &resid);
549 if (driver_byte(ret) & DRIVER_ERROR)
550 return -EBUSY;
551
552 stp->buffer->cmdstat.midlevel_result = streq->result = ret;
553 stp->buffer->cmdstat.residual = resid;
554 stp->buffer->syscall_result = st_chk_result(stp, streq);
555
556 return 0;
557}
1da177e4
LT		 558
559/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
560 write has been correct but EOM early warning reached, -EIO if write ended in
561 error or zero if write successful. Asynchronous writes are used only in
562 variable block mode. */
563static int write_behind_check(struct scsi_tape * STp)
564{
565 int retval = 0;
566 struct st_buffer *STbuffer;
567 struct st_partstat *STps;
568 struct st_cmdstatus *cmdstatp;
8b05b773 569 struct st_request *SRpnt;
1da177e4
LT		 570
571 STbuffer = STp->buffer;
572 if (!STbuffer->writing)
573 return 0;
574
575 DEB(
576 if (STp->write_pending)
577 STp->nbr_waits++;
578 else
579 STp->nbr_finished++;
580 ) /* end DEB */
581
582 wait_for_completion(&(STp->wait));
f03a5670
KM		 583 SRpnt = STbuffer->last_SRpnt;
584 STbuffer->last_SRpnt = NULL;
8b05b773 585 SRpnt->waiting = NULL;
1da177e4 586
f03a5670 587 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 588 st_release_request(SRpnt);
1da177e4
LT		 589
590 STbuffer->buffer_bytes -= STbuffer->writing;
591 STps = &(STp->ps[STp->partition]);
592 if (STps->drv_block >= 0) {
593 if (STp->block_size == 0)
594 STps->drv_block++;
595 else
596 STps->drv_block += STbuffer->writing / STp->block_size;
597 }
598
599 cmdstatp = &STbuffer->cmdstat;
600 if (STbuffer->syscall_result) {
601 retval = -EIO;
602 if (cmdstatp->have_sense && !cmdstatp->deferred &&
603 (cmdstatp->flags & SENSE_EOM) &&
604 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
605 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
606 /* EOM at write-behind, has all data been written? */
607 if (!cmdstatp->remainder_valid ||
608 cmdstatp->uremainder64 == 0)
609 retval = -ENOSPC;
610 }
611 if (retval == -EIO)
612 STps->drv_block = -1;
613 }
614 STbuffer->writing = 0;
615
616 DEB(if (debugging && retval)
617 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
618 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
619
620 return retval;
621}
622
623
624/* Step over EOF if it has been inadvertently crossed (ioctl not used because
625 it messes up the block number). */
626static int cross_eof(struct scsi_tape * STp, int forward)
627{
8b05b773 628 struct st_request *SRpnt;
1da177e4 629 unsigned char cmd[MAX_COMMAND_SIZE];
39ade4b1 630 int ret;
1da177e4
LT		 631
632 cmd[0] = SPACE;
633 cmd[1] = 0x01; /* Space FileMarks */
634 if (forward) {
635 cmd[2] = cmd[3] = 0;
636 cmd[4] = 1;
637 } else
638 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
639 cmd[5] = 0;
640
641 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
642 tape_name(STp), forward ? "forward" : "backward"));
643
39ade4b1 644 SRpnt = st_allocate_request(STp);
1da177e4 645 if (!SRpnt)
39ade4b1 646 return STp->buffer->syscall_result;
1da177e4 647
39ade4b1
FT		 648 ret = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
649 STp->device->request_queue->rq_timeout,
650 MAX_RETRIES);
651 if (ret)
652 goto out;
653
654 ret = STp->buffer->syscall_result;
1da177e4
LT		 655
656 if ((STp->buffer)->cmdstat.midlevel_result != 0)
657 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
658 tape_name(STp), forward ? "forward" : "backward");
659
39ade4b1
FT		 660out:
661 st_release_request(SRpnt);
662
663 return ret;
1da177e4
LT		 664}
665
666
667/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 668static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 669{
786231af 670 int transfer, blks;
1da177e4
LT		 671 int result;
672 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 673 struct st_request *SRpnt;
1da177e4
LT		 674 struct st_partstat *STps;
675
676 result = write_behind_check(STp);
677 if (result)
678 return result;
679
680 result = 0;
681 if (STp->dirty == 1) {
682
786231af 683 transfer = STp->buffer->buffer_bytes;
1da177e4
LT		 684 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
685 tape_name(STp), transfer));
686
1da177e4
LT		 687 memset(cmd, 0, MAX_COMMAND_SIZE);
688 cmd[0] = WRITE_6;
689 cmd[1] = 1;
690 blks = transfer / STp->block_size;
691 cmd[2] = blks >> 16;
692 cmd[3] = blks >> 8;
693 cmd[4] = blks;
694
695 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 696 STp->device->request_queue->rq_timeout,
697 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 698 if (!SRpnt)
699 return (STp->buffer)->syscall_result;
700
701 STps = &(STp->ps[STp->partition]);
702 if ((STp->buffer)->syscall_result != 0) {
703 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
704
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 (!cmdstatp->remainder_valid ||
710 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
711 STp->dirty = 0;
712 (STp->buffer)->buffer_bytes = 0;
713 if (STps->drv_block >= 0)
714 STps->drv_block += blks;
715 result = (-ENOSPC);
716 } else {
717 printk(KERN_ERR "%s: Error on flush.\n",
718 tape_name(STp));
719 STps->drv_block = (-1);
720 result = (-EIO);
721 }
722 } else {
723 if (STps->drv_block >= 0)
724 STps->drv_block += blks;
725 STp->dirty = 0;
726 (STp->buffer)->buffer_bytes = 0;
727 }
8b05b773 728 st_release_request(SRpnt);
1da177e4
LT		 729 SRpnt = NULL;
730 }
731 return result;
732}
733
734
735/* Flush the tape buffer. The tape will be positioned correctly unless
736 seek_next is true. */
737static int flush_buffer(struct scsi_tape *STp, int seek_next)
738{
739 int backspace, result;
740 struct st_buffer *STbuffer;
741 struct st_partstat *STps;
742
743 STbuffer = STp->buffer;
744
745 /*
746 * If there was a bus reset, block further access
747 * to this device.
748 */
749 if (STp->pos_unknown)
750 return (-EIO);
751
752 if (STp->ready != ST_READY)
753 return 0;
754 STps = &(STp->ps[STp->partition]);
755 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 756 return st_flush_write_buffer(STp);
1da177e4
LT		 757
758 if (STp->block_size == 0)
759 return 0;
760
761 backspace = ((STp->buffer)->buffer_bytes +
762 (STp->buffer)->read_pointer) / STp->block_size -
763 ((STp->buffer)->read_pointer + STp->block_size - 1) /
764 STp->block_size;
765 (STp->buffer)->buffer_bytes = 0;
766 (STp->buffer)->read_pointer = 0;
767 result = 0;
768 if (!seek_next) {
769 if (STps->eof == ST_FM_HIT) {
770 result = cross_eof(STp, 0); /* Back over the EOF hit */
771 if (!result)
772 STps->eof = ST_NOEOF;
773 else {
774 if (STps->drv_file >= 0)
775 STps->drv_file++;
776 STps->drv_block = 0;
777 }
778 }
779 if (!result && backspace > 0)
780 result = st_int_ioctl(STp, MTBSR, backspace);
781 } else if (STps->eof == ST_FM_HIT) {
782 if (STps->drv_file >= 0)
783 STps->drv_file++;
784 STps->drv_block = 0;
785 STps->eof = ST_NOEOF;
786 }
787 return result;
788
789}
790\f
791/* Set the mode parameters */
792static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
793{
794 int set_it = 0;
795 unsigned long arg;
796 char *name = tape_name(STp);
797
798 if (!STp->density_changed &&
799 STm->default_density >= 0 &&
800 STm->default_density != STp->density) {
801 arg = STm->default_density;
802 set_it = 1;
803 } else
804 arg = STp->density;
805 arg <<= MT_ST_DENSITY_SHIFT;
806 if (!STp->blksize_changed &&
807 STm->default_blksize >= 0 &&
808 STm->default_blksize != STp->block_size) {
809 arg |= STm->default_blksize;
810 set_it = 1;
811 } else
812 arg |= STp->block_size;
813 if (set_it &&
814 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
815 printk(KERN_WARNING
816 "%s: Can't set default block size to %d bytes and density %x.\n",
817 name, STm->default_blksize, STm->default_density);
818 if (modes_defined)
819 return (-EINVAL);
820 }
821 return 0;
822}
823
824
8b05b773 825/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 826static int do_door_lock(struct scsi_tape * STp, int do_lock)
827{
828 int retval, cmd;
829 DEB(char *name = tape_name(STp);)
830
831
832 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
833 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
834 do_lock ? "L" : "Unl"));
835 retval = scsi_ioctl(STp->device, cmd, NULL);
836 if (!retval) {
837 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
838 }
839 else {
840 STp->door_locked = ST_LOCK_FAILS;
841 }
842 return retval;
843}
844
845
846/* Set the internal state after reset */
847static void reset_state(struct scsi_tape *STp)
848{
849 int i;
850 struct st_partstat *STps;
851
852 STp->pos_unknown = 0;
853 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
854 STps = &(STp->ps[i]);
855 STps->rw = ST_IDLE;
856 STps->eof = ST_NOEOF;
857 STps->at_sm = 0;
858 STps->last_block_valid = 0;
859 STps->drv_block = -1;
860 STps->drv_file = -1;
861 }
862 if (STp->can_partitions) {
863 STp->partition = find_partition(STp);
864 if (STp->partition < 0)
865 STp->partition = 0;
866 STp->new_partition = STp->partition;
867 }
868}
869\f
870/* Test if the drive is ready. Returns either one of the codes below or a negative system
871 error code. */
872#define CHKRES_READY 0
873#define CHKRES_NEW_SESSION 1
874#define CHKRES_NOT_READY 2
875#define CHKRES_NO_TAPE 3
876
877#define MAX_ATTENTIONS 10
878
879static int test_ready(struct scsi_tape *STp, int do_wait)
880{
881 int attentions, waits, max_wait, scode;
882 int retval = CHKRES_READY, new_session = 0;
883 unsigned char cmd[MAX_COMMAND_SIZE];
0944a721 884 struct st_request *SRpnt;
1da177e4
LT		 885 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
886
0944a721
FT		 887 SRpnt = st_allocate_request(STp);
888 if (!SRpnt)
889 return STp->buffer->syscall_result;
890
1da177e4
LT		 891 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
892
893 for (attentions=waits=0; ; ) {
894 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
895 cmd[0] = TEST_UNIT_READY;
1da177e4 896
0944a721
FT		 897 retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
898 STp->long_timeout,
899 MAX_READY_RETRIES);
900 if (retval)
1da177e4 901 break;
1da177e4
LT		 902
903 if (cmdstatp->have_sense) {
904
905 scode = cmdstatp->sense_hdr.sense_key;
906
907 if (scode == UNIT_ATTENTION) { /* New media? */
908 new_session = 1;
909 if (attentions < MAX_ATTENTIONS) {
910 attentions++;
911 continue;
912 }
913 else {
914 retval = (-EIO);
915 break;
916 }
917 }
918
919 if (scode == NOT_READY) {
920 if (waits < max_wait) {
921 if (msleep_interruptible(1000)) {
922 retval = (-EINTR);
923 break;
924 }
925 waits++;
926 continue;
927 }
928 else {
929 if ((STp->device)->scsi_level >= SCSI_2 &&
930 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
931 retval = CHKRES_NO_TAPE;
932 else
933 retval = CHKRES_NOT_READY;
934 break;
935 }
936 }
937 }
938
939 retval = (STp->buffer)->syscall_result;
940 if (!retval)
941 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
942 break;
943 }
944
0944a721
FT		 945 st_release_request(SRpnt);
946
1da177e4
LT		 947 return retval;
948}
949
950
951/* See if the drive is ready and gather information about the tape. Return values:
952 < 0 negative error code from errno.h
953 0 drive ready
954 1 drive not ready (possibly no tape)
955*/
956static int check_tape(struct scsi_tape *STp, struct file *filp)
957{
958 int i, retval, new_session = 0, do_wait;
959 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
960 unsigned short st_flags = filp->f_flags;
8b05b773 961 struct st_request *SRpnt = NULL;
1da177e4
LT		 962 struct st_modedef *STm;
963 struct st_partstat *STps;
964 char *name = tape_name(STp);
7ac6207b 965 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 966 int mode = TAPE_MODE(inode);
967
968 STp->ready = ST_READY;
969
970 if (mode != STp->current_mode) {
971 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
972 name, STp->current_mode, mode));
973 new_session = 1;
974 STp->current_mode = mode;
975 }
976 STm = &(STp->modes[STp->current_mode]);
977
978 saved_cleaning = STp->cleaning_req;
979 STp->cleaning_req = 0;
980
981 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
982 retval = test_ready(STp, do_wait);
983
984 if (retval < 0)
985 goto err_out;
986
987 if (retval == CHKRES_NEW_SESSION) {
988 STp->pos_unknown = 0;
989 STp->partition = STp->new_partition = 0;
990 if (STp->can_partitions)
991 STp->nbr_partitions = 1; /* This guess will be updated later
992 if necessary */
993 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
994 STps = &(STp->ps[i]);
995 STps->rw = ST_IDLE;
996 STps->eof = ST_NOEOF;
997 STps->at_sm = 0;
998 STps->last_block_valid = 0;
999 STps->drv_block = 0;
1000 STps->drv_file = 0;
1001 }
1002 new_session = 1;
1003 }
1004 else {
1005 STp->cleaning_req |= saved_cleaning;
1006
1007 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1008 if (retval == CHKRES_NO_TAPE)
1009 STp->ready = ST_NO_TAPE;
1010 else
1011 STp->ready = ST_NOT_READY;
1012
1013 STp->density = 0; /* Clear the erroneous "residue" */
1014 STp->write_prot = 0;
1015 STp->block_size = 0;
1016 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1017 STp->partition = STp->new_partition = 0;
1018 STp->door_locked = ST_UNLOCKED;
1019 return CHKRES_NOT_READY;
1020 }
1021 }
1022
52107b2c
FT		 1023 SRpnt = st_allocate_request(STp);
1024 if (!SRpnt) {
1025 retval = STp->buffer->syscall_result;
1026 goto err_out;
1027 }
1028
1da177e4
LT		 1029 if (STp->omit_blklims)
1030 STp->min_block = STp->max_block = (-1);
1031 else {
1032 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1033 cmd[0] = READ_BLOCK_LIMITS;
1034
52107b2c
FT		 1035 retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
1036 STp->buffer->b_data, 6,
1037 STp->device->request_queue->rq_timeout,
1038 MAX_READY_RETRIES);
1039 if (retval) {
1040 st_release_request(SRpnt);
1da177e4
LT		 1041 goto err_out;
1042 }
1043
8b05b773 1044 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1045 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1046 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1047 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1048 (STp->buffer)->b_data[5];
1049 if ( DEB( debugging || ) !STp->inited)
42252854 1050 printk(KERN_INFO
1da177e4
LT		 1051 "%s: Block limits %d - %d bytes.\n", name,
1052 STp->min_block, STp->max_block);
1053 } else {
1054 STp->min_block = STp->max_block = (-1);
1055 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1056 name));
1057 }
1058 }
1059
1060 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1061 cmd[0] = MODE_SENSE;
1062 cmd[4] = 12;
1063
52107b2c
FT		 1064 retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
1065 STp->buffer->b_data, 12,
1066 STp->device->request_queue->rq_timeout,
1067 MAX_READY_RETRIES);
1068 if (retval) {
1069 st_release_request(SRpnt);
1da177e4
LT		 1070 goto err_out;
1071 }
1072
1073 if ((STp->buffer)->syscall_result != 0) {
1074 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1075 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1076 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1077 STp->drv_write_prot = 0;
1078 } else {
1079 DEBC(printk(ST_DEB_MSG
1080 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1081 name,
1082 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1083 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1084
1085 if ((STp->buffer)->b_data[3] >= 8) {
1086 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1087 STp->density = (STp->buffer)->b_data[4];
1088 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1089 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1090 DEBC(printk(ST_DEB_MSG
1091 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1092 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1093 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1094 STp->drv_buffer));
1095 }
1096 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1097 }
8b05b773 1098 st_release_request(SRpnt);
1da177e4
LT		 1099 SRpnt = NULL;
1100 STp->inited = 1;
1101
1102 if (STp->block_size > 0)
1103 (STp->buffer)->buffer_blocks =
1104 (STp->buffer)->buffer_size / STp->block_size;
1105 else
1106 (STp->buffer)->buffer_blocks = 1;
1107 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1108
1109 DEBC(printk(ST_DEB_MSG
1110 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1111 STp->block_size, (STp->buffer)->buffer_size,
1112 (STp->buffer)->buffer_blocks));
1113
1114 if (STp->drv_write_prot) {
1115 STp->write_prot = 1;
1116
1117 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1118
1119 if (do_wait &&
1120 ((st_flags & O_ACCMODE) == O_WRONLY ||
1121 (st_flags & O_ACCMODE) == O_RDWR)) {
1122 retval = (-EROFS);
1123 goto err_out;
1124 }
1125 }
1126
1127 if (STp->can_partitions && STp->nbr_partitions < 1) {
1128 /* This code is reached when the device is opened for the first time
1129 after the driver has been initialized with tape in the drive and the
1130 partition support has been enabled. */
1131 DEBC(printk(ST_DEB_MSG
1132 "%s: Updating partition number in status.\n", name));
1133 if ((STp->partition = find_partition(STp)) < 0) {
1134 retval = STp->partition;
1135 goto err_out;
1136 }
1137 STp->new_partition = STp->partition;
1138 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1139 }
1140
1141 if (new_session) { /* Change the drive parameters for the new mode */
1142 STp->density_changed = STp->blksize_changed = 0;
1143 STp->compression_changed = 0;
1144 if (!(STm->defaults_for_writes) &&
1145 (retval = set_mode_densblk(STp, STm)) < 0)
1146 goto err_out;
1147
1148 if (STp->default_drvbuffer != 0xff) {
1149 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1150 printk(KERN_WARNING
1151 "%s: Can't set default drive buffering to %d.\n",
1152 name, STp->default_drvbuffer);
1153 }
1154 }
1155
1156 return CHKRES_READY;
1157
1158 err_out:
1159 return retval;
1160}
1161
1162
b3369c68 1163\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1164 module count. */
1165static int st_open(struct inode *inode, struct file *filp)
1166{
1167 int i, retval = (-EIO);
1168 struct scsi_tape *STp;
1169 struct st_partstat *STps;
1170 int dev = TAPE_NR(inode);
1171 char *name;
1172
b3369c68 1173 lock_kernel();
1da177e4
LT		 1174 /*
1175 * We really want to do nonseekable_open(inode, filp); here, but some
1176 * versions of tar incorrectly call lseek on tapes and bail out if that
1177 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1178 */
1179 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1180
b3369c68
JC		 1181 if (!(STp = scsi_tape_get(dev))) {
1182 unlock_kernel();
f03a5670 1183 return -ENXIO;
b3369c68 1184 }
f03a5670 1185
1da177e4 1186 write_lock(&st_dev_arr_lock);
1da177e4
LT		 1187 filp->private_data = STp;
1188 name = tape_name(STp);
1189
1190 if (STp->in_use) {
1191 write_unlock(&st_dev_arr_lock);
f03a5670 1192 scsi_tape_put(STp);
b3369c68 1193 unlock_kernel();
1da177e4
LT		 1194 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1195 return (-EBUSY);
1196 }
1197
1da177e4
LT		 1198 STp->in_use = 1;
1199 write_unlock(&st_dev_arr_lock);
1200 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1201
1202 if (!scsi_block_when_processing_errors(STp->device)) {
1203 retval = (-ENXIO);
1204 goto err_out;
1205 }
1206
1207 /* See that we have at least a one page buffer available */
1208 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1209 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1210 name);
1211 retval = (-EOVERFLOW);
1212 goto err_out;
1213 }
1214
40f6b36c 1215 (STp->buffer)->cleared = 0;
1da177e4
LT		 1216 (STp->buffer)->writing = 0;
1217 (STp->buffer)->syscall_result = 0;
1218
1219 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1220
1221 STp->dirty = 0;
1222 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1223 STps = &(STp->ps[i]);
1224 STps->rw = ST_IDLE;
1225 }
9abe16c6 1226 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1227 STp->recover_count = 0;
1228 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1229 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1230
1231 retval = check_tape(STp, filp);
1232 if (retval < 0)
1233 goto err_out;
1234 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1235 retval != CHKRES_READY) {
413f7327
KM		 1236 if (STp->ready == NO_TAPE)
1237 retval = (-ENOMEDIUM);
1238 else
1239 retval = (-EIO);
1da177e4
LT		 1240 goto err_out;
1241 }
b3369c68 1242 unlock_kernel();
1da177e4
LT		 1243 return 0;
1244
1245 err_out:
1246 normalize_buffer(STp->buffer);
1247 STp->in_use = 0;
f03a5670 1248 scsi_tape_put(STp);
b3369c68 1249 unlock_kernel();
1da177e4
LT		 1250 return retval;
1251
1252}
1253\f
1254
1255/* Flush the tape buffer before close */
75e1fcc0 1256static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1257{
1258 int result = 0, result2;
1259 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1260 struct st_request *SRpnt;
1da177e4
LT		 1261 struct scsi_tape *STp = filp->private_data;
1262 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1263 struct st_partstat *STps = &(STp->ps[STp->partition]);
1264 char *name = tape_name(STp);
1265
1266 if (file_count(filp) > 1)
1267 return 0;
1268
1269 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1270 result = st_flush_write_buffer(STp);
1da177e4
LT		 1271 if (result != 0 && result != (-ENOSPC))
1272 goto out;
1273 }
1274
1275 if (STp->can_partitions &&
1276 (result2 = switch_partition(STp)) < 0) {
1277 DEBC(printk(ST_DEB_MSG
1278 "%s: switch_partition at close failed.\n", name));
1279 if (result == 0)
1280 result = result2;
1281 goto out;
1282 }
1283
1284 DEBC( if (STp->nbr_requests)
deee13df
KM		 1285 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1286 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1da177e4
LT		 1287
1288 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1289 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1290
1291 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1292 name, STp->nbr_waits, STp->nbr_finished);
1293 )
1294
1295 memset(cmd, 0, MAX_COMMAND_SIZE);
1296 cmd[0] = WRITE_FILEMARKS;
1297 cmd[4] = 1 + STp->two_fm;
1298
212cd8bf 1299 SRpnt = st_allocate_request(STp);
1da177e4 1300 if (!SRpnt) {
212cd8bf
FT		 1301 result = STp->buffer->syscall_result;
1302 goto out;
1303 }
1304
1305 result = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
1306 STp->device->request_queue->rq_timeout,
1307 MAX_WRITE_RETRIES);
1308 if (result) {
1309 st_release_request(SRpnt);
1da177e4
LT		 1310 goto out;
1311 }
1312
1313 if (STp->buffer->syscall_result == 0 ||
1314 (cmdstatp->have_sense && !cmdstatp->deferred &&
1315 (cmdstatp->flags & SENSE_EOM) &&
1316 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1317 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1318 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1319 /* Write successful at EOM */
8b05b773 1320 st_release_request(SRpnt);
1da177e4
LT		 1321 SRpnt = NULL;
1322 if (STps->drv_file >= 0)
1323 STps->drv_file++;
1324 STps->drv_block = 0;
1325 if (STp->two_fm)
1326 cross_eof(STp, 0);
1327 STps->eof = ST_FM;
1328 }
1329 else { /* Write error */
8b05b773 1330 st_release_request(SRpnt);
1da177e4
LT		 1331 SRpnt = NULL;
1332 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1333 if (result == 0)
1334 result = (-EIO);
1335 }
1336
1337 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1338 name, cmd[4]));
1339 } else if (!STp->rew_at_close) {
1340 STps = &(STp->ps[STp->partition]);
1341 if (!STm->sysv || STps->rw != ST_READING) {
1342 if (STp->can_bsr)
1343 result = flush_buffer(STp, 0);
1344 else if (STps->eof == ST_FM_HIT) {
1345 result = cross_eof(STp, 0);
1346 if (result) {
1347 if (STps->drv_file >= 0)
1348 STps->drv_file++;
1349 STps->drv_block = 0;
1350 STps->eof = ST_FM;
1351 } else
1352 STps->eof = ST_NOEOF;
1353 }
1354 } else if ((STps->eof == ST_NOEOF &&
1355 !(result = cross_eof(STp, 1))) ||
1356 STps->eof == ST_FM_HIT) {
1357 if (STps->drv_file >= 0)
1358 STps->drv_file++;
1359 STps->drv_block = 0;
1360 STps->eof = ST_FM;
1361 }
1362 }
1363
1364 out:
1365 if (STp->rew_at_close) {
1366 result2 = st_int_ioctl(STp, MTREW, 1);
1367 if (result == 0)
1368 result = result2;
1369 }
1370 return result;
1371}
1372
1373
1374/* Close the device and release it. BKL is not needed: this is the only thread
1375 accessing this tape. */
1376static int st_release(struct inode *inode, struct file *filp)
1377{
1378 int result = 0;
1379 struct scsi_tape *STp = filp->private_data;
1380
1381 if (STp->door_locked == ST_LOCKED_AUTO)
1382 do_door_lock(STp, 0);
1383
1384 normalize_buffer(STp->buffer);
1385 write_lock(&st_dev_arr_lock);
1386 STp->in_use = 0;
1387 write_unlock(&st_dev_arr_lock);
f03a5670 1388 scsi_tape_put(STp);
1da177e4
LT		 1389
1390 return result;
1391}
1392\f
1393/* The checks common to both reading and writing */
1394static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1395{
1396 ssize_t retval = 0;
1397
1398 /*
1399 * If we are in the middle of error recovery, don't let anyone
1400 * else try and use this device. Also, if error recovery fails, it
1401 * may try and take the device offline, in which case all further
1402 * access to the device is prohibited.
1403 */
1404 if (!scsi_block_when_processing_errors(STp->device)) {
1405 retval = (-ENXIO);
1406 goto out;
1407 }
1408
1409 if (STp->ready != ST_READY) {
1410 if (STp->ready == ST_NO_TAPE)
1411 retval = (-ENOMEDIUM);
1412 else
1413 retval = (-EIO);
1414 goto out;
1415 }
1416
1417 if (! STp->modes[STp->current_mode].defined) {
1418 retval = (-ENXIO);
1419 goto out;
1420 }
1421
1422
1423 /*
1424 * If there was a bus reset, block further access
1425 * to this device.
1426 */
1427 if (STp->pos_unknown) {
1428 retval = (-EIO);
1429 goto out;
1430 }
1431
1432 if (count == 0)
1433 goto out;
1434
1435 DEB(
1436 if (!STp->in_use) {
1437 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1438 retval = (-EIO);
1439 goto out;
1440 } ) /* end DEB */
1441
1442 if (STp->can_partitions &&
1443 (retval = switch_partition(STp)) < 0)
1444 goto out;
1445
1446 if (STp->block_size == 0 && STp->max_block > 0 &&
1447 (count < STp->min_block || count > STp->max_block)) {
1448 retval = (-EINVAL);
1449 goto out;
1450 }
1451
1452 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1453 !do_door_lock(STp, 1))
1454 STp->door_locked = ST_LOCKED_AUTO;
1455
1456 out:
1457 return retval;
1458}
1459
1460
1461static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1462 size_t count, int is_read)
1463{
1464 int i, bufsize, retval = 0;
1465 struct st_buffer *STbp = STp->buffer;
1466
1467 if (is_read)
9abe16c6 1468 i = STp->try_dio_now && try_rdio;
1da177e4 1469 else
9abe16c6 1470 i = STp->try_dio_now && try_wdio;
8b05b773 1471
1da177e4
LT		 1472 if (i && ((unsigned long)buf & queue_dma_alignment(
1473 STp->device->request_queue)) == 0) {
8b05b773
MC		 1474 i = sgl_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
1475 (unsigned long)buf, count, (is_read ? READ : WRITE));
1da177e4
LT		 1476 if (i > 0) {
1477 STbp->do_dio = i;
1478 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1479 }
1480 else
1481 STbp->do_dio = 0; /* fall back to buffering with any error */
1482 STbp->sg_segs = STbp->do_dio;
1483 STbp->frp_sg_current = 0;
1484 DEB(
1485 if (STbp->do_dio) {
1486 STp->nbr_dio++;
1487 STp->nbr_pages += STbp->do_dio;
1da177e4
LT		 1488 }
1489 )
1490 } else
1491 STbp->do_dio = 0;
1492 DEB( STp->nbr_requests++; )
1493
1494 if (!STbp->do_dio) {
1495 if (STp->block_size)
1496 bufsize = STp->block_size > st_fixed_buffer_size ?
1497 STp->block_size : st_fixed_buffer_size;
40f6b36c 1498 else {
1da177e4 1499 bufsize = count;
40f6b36c
KM		 1500 /* Make sure that data from previous user is not leaked even if
1501 HBA does not return correct residual */
1502 if (is_read && STp->sili && !STbp->cleared)
1503 clear_buffer(STbp);
1504 }
1505
1da177e4
LT		 1506 if (bufsize > STbp->buffer_size &&
1507 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1508 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1509 tape_name(STp), bufsize);
1510 retval = (-EOVERFLOW);
1511 goto out;
1512 }
1513 if (STp->block_size)
1514 STbp->buffer_blocks = bufsize / STp->block_size;
1515 }
1516
1517 out:
1518 return retval;
1519}
1520
1521
1522/* Can be called more than once after each setup_buffer() */
787926b1 1523static void release_buffering(struct scsi_tape *STp, int is_read)
1da177e4
LT		 1524{
1525 struct st_buffer *STbp;
1526
1527 STbp = STp->buffer;
1528 if (STbp->do_dio) {
787926b1 1529 sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, is_read);
1da177e4 1530 STbp->do_dio = 0;
787926b1 1531 STbp->sg_segs = 0;
1da177e4
LT		 1532 }
1533}
1534
1535
1536/* Write command */
1537static ssize_t
1538st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1539{
1540 ssize_t total;
1541 ssize_t i, do_count, blks, transfer;
1542 ssize_t retval;
1543 int undone, retry_eot = 0, scode;
1544 int async_write;
1545 unsigned char cmd[MAX_COMMAND_SIZE];
1546 const char __user *b_point;
8b05b773 1547 struct st_request *SRpnt = NULL;
1da177e4
LT		 1548 struct scsi_tape *STp = filp->private_data;
1549 struct st_modedef *STm;
1550 struct st_partstat *STps;
1551 struct st_buffer *STbp;
1552 char *name = tape_name(STp);
1553
28f85009 1554 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 1555 return -ERESTARTSYS;
1556
1557 retval = rw_checks(STp, filp, count);
1558 if (retval || count == 0)
1559 goto out;
1560
1561 /* Write must be integral number of blocks */
1562 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1563 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1564 name);
1565 retval = (-EINVAL);
1566 goto out;
1567 }
1568
1569 STm = &(STp->modes[STp->current_mode]);
1570 STps = &(STp->ps[STp->partition]);
1571
1572 if (STp->write_prot) {
1573 retval = (-EACCES);
1574 goto out;
1575 }
1576
1577
1578 if (STps->rw == ST_READING) {
1579 retval = flush_buffer(STp, 0);
1580 if (retval)
1581 goto out;
1582 STps->rw = ST_WRITING;
1583 } else if (STps->rw != ST_WRITING &&
1584 STps->drv_file == 0 && STps->drv_block == 0) {
1585 if ((retval = set_mode_densblk(STp, STm)) < 0)
1586 goto out;
1587 if (STm->default_compression != ST_DONT_TOUCH &&
1588 !(STp->compression_changed)) {
1589 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1590 printk(KERN_WARNING "%s: Can't set default compression.\n",
1591 name);
1592 if (modes_defined) {
1593 retval = (-EINVAL);
1594 goto out;
1595 }
1596 }
1597 }
1598 }
1599
1600 STbp = STp->buffer;
1601 i = write_behind_check(STp);
1602 if (i) {
1603 if (i == -ENOSPC)
1604 STps->eof = ST_EOM_OK;
1605 else
1606 STps->eof = ST_EOM_ERROR;
1607 }
1608
1609 if (STps->eof == ST_EOM_OK) {
1610 STps->eof = ST_EOD_1; /* allow next write */
1611 retval = (-ENOSPC);
1612 goto out;
1613 }
1614 else if (STps->eof == ST_EOM_ERROR) {
1615 retval = (-EIO);
1616 goto out;
1617 }
1618
1619 /* Check the buffer readability in cases where copy_user might catch
1620 the problems after some tape movement. */
1621 if (STp->block_size != 0 &&
1622 !STbp->do_dio &&
1623 (copy_from_user(&i, buf, 1) != 0 ||
1624 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1625 retval = (-EFAULT);
1626 goto out;
1627 }
1628
1629 retval = setup_buffering(STp, buf, count, 0);
1630 if (retval)
1631 goto out;
1632
1633 total = count;
1634
1635 memset(cmd, 0, MAX_COMMAND_SIZE);
1636 cmd[0] = WRITE_6;
1637 cmd[1] = (STp->block_size != 0);
1638
1639 STps->rw = ST_WRITING;
1640
1641 b_point = buf;
1642 while (count > 0 && !retry_eot) {
1643
1644 if (STbp->do_dio) {
1645 do_count = count;
1646 }
1647 else {
1648 if (STp->block_size == 0)
1649 do_count = count;
1650 else {
1651 do_count = STbp->buffer_blocks * STp->block_size -
1652 STbp->buffer_bytes;
1653 if (do_count > count)
1654 do_count = count;
1655 }
1656
1657 i = append_to_buffer(b_point, STbp, do_count);
1658 if (i) {
1659 retval = i;
1660 goto out;
1661 }
1662 }
1663 count -= do_count;
1664 b_point += do_count;
1665
1666 async_write = STp->block_size == 0 && !STbp->do_dio &&
1667 STm->do_async_writes && STps->eof < ST_EOM_OK;
1668
1669 if (STp->block_size != 0 && STm->do_buffer_writes &&
9abe16c6 1670 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1da177e4
LT		 1671 STbp->buffer_bytes < STbp->buffer_size) {
1672 STp->dirty = 1;
1673 /* Don't write a buffer that is not full enough. */
1674 if (!async_write && count == 0)
1675 break;
1676 }
1677
1678 retry_write:
1679 if (STp->block_size == 0)
1680 blks = transfer = do_count;
1681 else {
1682 if (!STbp->do_dio)
1683 blks = STbp->buffer_bytes;
1684 else
1685 blks = do_count;
1686 blks /= STp->block_size;
1687 transfer = blks * STp->block_size;
1688 }
1689 cmd[2] = blks >> 16;
1690 cmd[3] = blks >> 8;
1691 cmd[4] = blks;
1692
1693 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 1694 STp->device->request_queue->rq_timeout,
1695 MAX_WRITE_RETRIES, !async_write);
1da177e4
LT		 1696 if (!SRpnt) {
1697 retval = STbp->syscall_result;
1698 goto out;
1699 }
8b05b773 1700 if (async_write && !STbp->syscall_result) {
1da177e4
LT		 1701 STbp->writing = transfer;
1702 STp->dirty = !(STbp->writing ==
1703 STbp->buffer_bytes);
1704 SRpnt = NULL; /* Prevent releasing this request! */
1705 DEB( STp->write_pending = 1; )
1706 break;
1707 }
1708
1709 if (STbp->syscall_result != 0) {
1710 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1711
1712 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1713 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1714 scode = cmdstatp->sense_hdr.sense_key;
1715 if (cmdstatp->remainder_valid)
1716 undone = (int)cmdstatp->uremainder64;
1717 else if (STp->block_size == 0 &&
1718 scode == VOLUME_OVERFLOW)
1719 undone = transfer;
1720 else
1721 undone = 0;
1722 if (STp->block_size != 0)
1723 undone *= STp->block_size;
1724 if (undone <= do_count) {
1725 /* Only data from this write is not written */
1726 count += undone;
626dcb1e 1727 b_point -= undone;
1da177e4
LT		 1728 do_count -= undone;
1729 if (STp->block_size)
1730 blks = (transfer - undone) / STp->block_size;
1731 STps->eof = ST_EOM_OK;
1732 /* Continue in fixed block mode if all written
1733 in this request but still something left to write
1734 (retval left to zero)
1735 */
1736 if (STp->block_size == 0 ||
1737 undone > 0 || count == 0)
1738 retval = (-ENOSPC); /* EOM within current request */
1739 DEBC(printk(ST_DEB_MSG
1740 "%s: EOM with %d bytes unwritten.\n",
1741 name, (int)count));
1742 } else {
1743 /* EOT within data buffered earlier (possible only
1744 in fixed block mode without direct i/o) */
1745 if (!retry_eot && !cmdstatp->deferred &&
1746 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1747 move_buffer_data(STp->buffer, transfer - undone);
1748 retry_eot = 1;
1749 if (STps->drv_block >= 0) {
1750 STps->drv_block += (transfer - undone) /
1751 STp->block_size;
1752 }
1753 STps->eof = ST_EOM_OK;
1754 DEBC(printk(ST_DEB_MSG
1755 "%s: Retry write of %d bytes at EOM.\n",
1756 name, STp->buffer->buffer_bytes));
1757 goto retry_write;
1758 }
1759 else {
1760 /* Either error within data buffered by driver or
1761 failed retry */
1762 count -= do_count;
1763 blks = do_count = 0;
1764 STps->eof = ST_EOM_ERROR;
1765 STps->drv_block = (-1); /* Too cautious? */
1766 retval = (-EIO); /* EOM for old data */
1767 DEBC(printk(ST_DEB_MSG
1768 "%s: EOM with lost data.\n",
1769 name));
1770 }
1771 }
1772 } else {
1773 count += do_count;
1774 STps->drv_block = (-1); /* Too cautious? */
8b05b773 1775 retval = STbp->syscall_result;
1da177e4
LT		 1776 }
1777
1778 }
1779
1780 if (STps->drv_block >= 0) {
1781 if (STp->block_size == 0)
1782 STps->drv_block += (do_count > 0);
1783 else
1784 STps->drv_block += blks;
1785 }
1786
1787 STbp->buffer_bytes = 0;
1788 STp->dirty = 0;
1789
1790 if (retval || retry_eot) {
1791 if (count < total)
1792 retval = total - count;
1793 goto out;
1794 }
1795 }
1796
1797 if (STps->eof == ST_EOD_1)
1798 STps->eof = ST_EOM_OK;
1799 else if (STps->eof != ST_EOM_OK)
1800 STps->eof = ST_NOEOF;
1801 retval = total - count;
1802
1803 out:
1804 if (SRpnt != NULL)
8b05b773 1805 st_release_request(SRpnt);
787926b1 1806 release_buffering(STp, 0);
28f85009 1807 mutex_unlock(&STp->lock);
1da177e4
LT		 1808
1809 return retval;
1810}
1811\f
1812/* Read data from the tape. Returns zero in the normal case, one if the
1813 eof status has changed, and the negative error code in case of a
1814 fatal error. Otherwise updates the buffer and the eof state.
1815
1816 Does release user buffer mapping if it is set.
1817*/
1818static long read_tape(struct scsi_tape *STp, long count,
8b05b773 1819 struct st_request ** aSRpnt)
1da177e4
LT		 1820{
1821 int transfer, blks, bytes;
1822 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1823 struct st_request *SRpnt;
1da177e4
LT		 1824 struct st_modedef *STm;
1825 struct st_partstat *STps;
1826 struct st_buffer *STbp;
1827 int retval = 0;
1828 char *name = tape_name(STp);
1829
1830 if (count == 0)
1831 return 0;
1832
1833 STm = &(STp->modes[STp->current_mode]);
1834 STps = &(STp->ps[STp->partition]);
1835 if (STps->eof == ST_FM_HIT)
1836 return 1;
1837 STbp = STp->buffer;
1838
1839 if (STp->block_size == 0)
1840 blks = bytes = count;
1841 else {
9abe16c6 1842 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1da177e4
LT		 1843 blks = (STp->buffer)->buffer_blocks;
1844 bytes = blks * STp->block_size;
1845 } else {
1846 bytes = count;
1847 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1848 bytes = (STp->buffer)->buffer_size;
1849 blks = bytes / STp->block_size;
1850 bytes = blks * STp->block_size;
1851 }
1852 }
1853
1854 memset(cmd, 0, MAX_COMMAND_SIZE);
1855 cmd[0] = READ_6;
1856 cmd[1] = (STp->block_size != 0);
40f6b36c
KM		 1857 if (!cmd[1] && STp->sili)
1858 cmd[1] |= 2;
1da177e4
LT		 1859 cmd[2] = blks >> 16;
1860 cmd[3] = blks >> 8;
1861 cmd[4] = blks;
1862
1863 SRpnt = *aSRpnt;
1864 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
a02488ed
JB		 1865 STp->device->request_queue->rq_timeout,
1866 MAX_RETRIES, 1);
787926b1 1867 release_buffering(STp, 1);
1da177e4
LT		 1868 *aSRpnt = SRpnt;
1869 if (!SRpnt)
1870 return STbp->syscall_result;
1871
1872 STbp->read_pointer = 0;
1873 STps->at_sm = 0;
1874
1875 /* Something to check */
1876 if (STbp->syscall_result) {
1877 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1878
1879 retval = 1;
1880 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1881 name,
8b05b773
MC		 1882 SRpnt->sense[0], SRpnt->sense[1],
1883 SRpnt->sense[2], SRpnt->sense[3],
1884 SRpnt->sense[4], SRpnt->sense[5],
1885 SRpnt->sense[6], SRpnt->sense[7]));
1da177e4
LT		 1886 if (cmdstatp->have_sense) {
1887
1888 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1889 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1890
1891 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1892 /* Compute the residual count */
1893 if (cmdstatp->remainder_valid)
1894 transfer = (int)cmdstatp->uremainder64;
1895 else
1896 transfer = 0;
1897 if (STp->block_size == 0 &&
1898 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1899 transfer = bytes;
1900
1901 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1902 if (STp->block_size == 0) {
1903 if (transfer <= 0) {
1904 if (transfer < 0)
1905 printk(KERN_NOTICE
1906 "%s: Failed to read %d byte block with %d byte transfer.\n",
1907 name, bytes - transfer, bytes);
1908 if (STps->drv_block >= 0)
1909 STps->drv_block += 1;
1910 STbp->buffer_bytes = 0;
1911 return (-ENOMEM);
1912 }
1913 STbp->buffer_bytes = bytes - transfer;
1914 } else {
8b05b773 1915 st_release_request(SRpnt);
1da177e4
LT		 1916 SRpnt = *aSRpnt = NULL;
1917 if (transfer == blks) { /* We did not get anything, error */
1918 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1919 if (STps->drv_block >= 0)
1920 STps->drv_block += blks - transfer + 1;
1921 st_int_ioctl(STp, MTBSR, 1);
1922 return (-EIO);
1923 }
1924 /* We have some data, deliver it */
1925 STbp->buffer_bytes = (blks - transfer) *
1926 STp->block_size;
1927 DEBC(printk(ST_DEB_MSG
1928 "%s: ILI but enough data received %ld %d.\n",
1929 name, count, STbp->buffer_bytes));
1930 if (STps->drv_block >= 0)
1931 STps->drv_block += 1;
1932 if (st_int_ioctl(STp, MTBSR, 1))
1933 return (-EIO);
1934 }
1935 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1936 if (STps->eof != ST_FM_HIT)
1937 STps->eof = ST_FM_HIT;
1938 else
1939 STps->eof = ST_EOD_2;
1940 if (STp->block_size == 0)
1941 STbp->buffer_bytes = 0;
1942 else
1943 STbp->buffer_bytes =
1944 bytes - transfer * STp->block_size;
1945 DEBC(printk(ST_DEB_MSG
1946 "%s: EOF detected (%d bytes read).\n",
1947 name, STbp->buffer_bytes));
1948 } else if (cmdstatp->flags & SENSE_EOM) {
1949 if (STps->eof == ST_FM)
1950 STps->eof = ST_EOD_1;
1951 else
1952 STps->eof = ST_EOM_OK;
1953 if (STp->block_size == 0)
1954 STbp->buffer_bytes = bytes - transfer;
1955 else
1956 STbp->buffer_bytes =
1957 bytes - transfer * STp->block_size;
1958
1959 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1960 name, STbp->buffer_bytes));
1961 }
1962 }
1963 /* end of EOF, EOM, ILI test */
1964 else { /* nonzero sense key */
1965 DEBC(printk(ST_DEB_MSG
1966 "%s: Tape error while reading.\n", name));
1967 STps->drv_block = (-1);
1968 if (STps->eof == ST_FM &&
1969 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1970 DEBC(printk(ST_DEB_MSG
1971 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1972 name));
1973 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1974 } else /* Some other extended sense code */
1975 retval = (-EIO);
1976 }
1977
1978 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1979 STbp->buffer_bytes = 0;
1980 }
1981 /* End of extended sense test */
1982 else { /* Non-extended sense */
1983 retval = STbp->syscall_result;
1984 }
1985
1986 }
1987 /* End of error handling */
40f6b36c 1988 else { /* Read successful */
1da177e4 1989 STbp->buffer_bytes = bytes;
40f6b36c
KM		 1990 if (STp->sili) /* In fixed block mode residual is always zero here */
1991 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
1992 }
1da177e4
LT		 1993
1994 if (STps->drv_block >= 0) {
1995 if (STp->block_size == 0)
1996 STps->drv_block++;
1997 else
1998 STps->drv_block += STbp->buffer_bytes / STp->block_size;
1999 }
2000 return retval;
2001}
2002\f
2003
2004/* Read command */
2005static ssize_t
2006st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2007{
2008 ssize_t total;
2009 ssize_t retval = 0;
2010 ssize_t i, transfer;
2011 int special, do_dio = 0;
8b05b773 2012 struct st_request *SRpnt = NULL;
1da177e4
LT		 2013 struct scsi_tape *STp = filp->private_data;
2014 struct st_modedef *STm;
2015 struct st_partstat *STps;
2016 struct st_buffer *STbp = STp->buffer;
2017 DEB( char *name = tape_name(STp); )
2018
28f85009 2019 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2020 return -ERESTARTSYS;
2021
2022 retval = rw_checks(STp, filp, count);
2023 if (retval || count == 0)
2024 goto out;
2025
2026 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2027 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2028 if (!STm->do_read_ahead) {
2029 retval = (-EINVAL); /* Read must be integral number of blocks */
2030 goto out;
2031 }
2032 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2033 }
2034
2035 STps = &(STp->ps[STp->partition]);
2036 if (STps->rw == ST_WRITING) {
2037 retval = flush_buffer(STp, 0);
2038 if (retval)
2039 goto out;
2040 STps->rw = ST_READING;
2041 }
2042 DEB(
2043 if (debugging && STps->eof != ST_NOEOF)
2044 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2045 STps->eof, STbp->buffer_bytes);
2046 ) /* end DEB */
2047
2048 retval = setup_buffering(STp, buf, count, 1);
2049 if (retval)
2050 goto out;
2051 do_dio = STbp->do_dio;
2052
2053 if (STbp->buffer_bytes == 0 &&
2054 STps->eof >= ST_EOD_1) {
2055 if (STps->eof < ST_EOD) {
2056 STps->eof += 1;
2057 retval = 0;
2058 goto out;
2059 }
2060 retval = (-EIO); /* EOM or Blank Check */
2061 goto out;
2062 }
2063
2064 if (do_dio) {
2065 /* Check the buffer writability before any tape movement. Don't alter
2066 buffer data. */
2067 if (copy_from_user(&i, buf, 1) != 0 ||
2068 copy_to_user(buf, &i, 1) != 0 ||
2069 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2070 copy_to_user(buf + count - 1, &i, 1) != 0) {
2071 retval = (-EFAULT);
2072 goto out;
2073 }
2074 }
2075
2076 STps->rw = ST_READING;
2077
2078
2079 /* Loop until enough data in buffer or a special condition found */
2080 for (total = 0, special = 0; total < count && !special;) {
2081
2082 /* Get new data if the buffer is empty */
2083 if (STbp->buffer_bytes == 0) {
2084 special = read_tape(STp, count - total, &SRpnt);
2085 if (special < 0) { /* No need to continue read */
2086 retval = special;
2087 goto out;
2088 }
2089 }
2090
2091 /* Move the data from driver buffer to user buffer */
2092 if (STbp->buffer_bytes > 0) {
2093 DEB(
2094 if (debugging && STps->eof != ST_NOEOF)
2095 printk(ST_DEB_MSG
2096 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2097 STps->eof, STbp->buffer_bytes,
2098 (int)(count - total));
2099 ) /* end DEB */
2100 transfer = STbp->buffer_bytes < count - total ?
2101 STbp->buffer_bytes : count - total;
2102 if (!do_dio) {
2103 i = from_buffer(STbp, buf, transfer);
2104 if (i) {
2105 retval = i;
2106 goto out;
2107 }
2108 }
2109 buf += transfer;
2110 total += transfer;
2111 }
2112
2113 if (STp->block_size == 0)
2114 break; /* Read only one variable length block */
2115
2116 } /* for (total = 0, special = 0;
2117 total < count && !special; ) */
2118
2119 /* Change the eof state if no data from tape or buffer */
2120 if (total == 0) {
2121 if (STps->eof == ST_FM_HIT) {
2122 STps->eof = ST_FM;
2123 STps->drv_block = 0;
2124 if (STps->drv_file >= 0)
2125 STps->drv_file++;
2126 } else if (STps->eof == ST_EOD_1) {
2127 STps->eof = ST_EOD_2;
2128 STps->drv_block = 0;
2129 if (STps->drv_file >= 0)
2130 STps->drv_file++;
2131 } else if (STps->eof == ST_EOD_2)
2132 STps->eof = ST_EOD;
2133 } else if (STps->eof == ST_FM)
2134 STps->eof = ST_NOEOF;
2135 retval = total;
2136
2137 out:
2138 if (SRpnt != NULL) {
8b05b773 2139 st_release_request(SRpnt);
1da177e4
LT		 2140 SRpnt = NULL;
2141 }
2142 if (do_dio) {
787926b1 2143 release_buffering(STp, 1);
1da177e4
LT		 2144 STbp->buffer_bytes = 0;
2145 }
28f85009 2146 mutex_unlock(&STp->lock);
1da177e4
LT		 2147
2148 return retval;
2149}
2150\f
2151
2152
2153DEB(
2154/* Set the driver options */
2155static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2156{
2157 if (debugging) {
2158 printk(KERN_INFO
2159 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2160 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2161 STm->do_read_ahead);
2162 printk(KERN_INFO
2163 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2164 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2165 printk(KERN_INFO
2166 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2167 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2168 STp->scsi2_logical);
2169 printk(KERN_INFO
40f6b36c
KM		 2170 "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate,
2171 STp->sili);
1da177e4
LT		 2172 printk(KERN_INFO "%s: debugging: %d\n",
2173 name, debugging);
2174 }
2175}
2176 )
2177
2178
2179static int st_set_options(struct scsi_tape *STp, long options)
2180{
2181 int value;
2182 long code;
2183 struct st_modedef *STm;
2184 char *name = tape_name(STp);
2185 struct cdev *cd0, *cd1;
2186
2187 STm = &(STp->modes[STp->current_mode]);
2188 if (!STm->defined) {
2189 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2190 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2191 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
2192 modes_defined = 1;
2193 DEBC(printk(ST_DEB_MSG
2194 "%s: Initialized mode %d definition from mode 0\n",
2195 name, STp->current_mode));
2196 }
2197
2198 code = options & MT_ST_OPTIONS;
2199 if (code == MT_ST_BOOLEANS) {
2200 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2201 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2202 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2203 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2204 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2205 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2206 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2207 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2208 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2209 if ((STp->device)->scsi_level >= SCSI_2)
2210 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2211 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2212 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2213 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2214 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4
LT		 2215 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2216 st_log_options(STp, STm, name); )
2217 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2218 value = (code == MT_ST_SETBOOLEANS);
2219 if ((options & MT_ST_BUFFER_WRITES) != 0)
2220 STm->do_buffer_writes = value;
2221 if ((options & MT_ST_ASYNC_WRITES) != 0)
2222 STm->do_async_writes = value;
2223 if ((options & MT_ST_DEF_WRITES) != 0)
2224 STm->defaults_for_writes = value;
2225 if ((options & MT_ST_READ_AHEAD) != 0)
2226 STm->do_read_ahead = value;
2227 if ((options & MT_ST_TWO_FM) != 0)
2228 STp->two_fm = value;
2229 if ((options & MT_ST_FAST_MTEOM) != 0)
2230 STp->fast_mteom = value;
2231 if ((options & MT_ST_AUTO_LOCK) != 0)
2232 STp->do_auto_lock = value;
2233 if ((options & MT_ST_CAN_BSR) != 0)
2234 STp->can_bsr = value;
2235 if ((options & MT_ST_NO_BLKLIMS) != 0)
2236 STp->omit_blklims = value;
2237 if ((STp->device)->scsi_level >= SCSI_2 &&
2238 (options & MT_ST_CAN_PARTITIONS) != 0)
2239 STp->can_partitions = value;
2240 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2241 STp->scsi2_logical = value;
2242 if ((options & MT_ST_NOWAIT) != 0)
2243 STp->immediate = value;
2244 if ((options & MT_ST_SYSV) != 0)
2245 STm->sysv = value;
40f6b36c
KM		 2246 if ((options & MT_ST_SILI) != 0)
2247 STp->sili = value;
1da177e4
LT		 2248 DEB(
2249 if ((options & MT_ST_DEBUGGING) != 0)
2250 debugging = value;
2251 st_log_options(STp, STm, name); )
2252 } else if (code == MT_ST_WRITE_THRESHOLD) {
2253 /* Retained for compatibility */
2254 } else if (code == MT_ST_DEF_BLKSIZE) {
2255 value = (options & ~MT_ST_OPTIONS);
2256 if (value == ~MT_ST_OPTIONS) {
2257 STm->default_blksize = (-1);
2258 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2259 } else {
2260 STm->default_blksize = value;
2261 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2262 name, STm->default_blksize));
2263 if (STp->ready == ST_READY) {
2264 STp->blksize_changed = 0;
2265 set_mode_densblk(STp, STm);
2266 }
2267 }
2268 } else if (code == MT_ST_TIMEOUTS) {
2269 value = (options & ~MT_ST_OPTIONS);
2270 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2271 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2272 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2273 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2274 } else {
a02488ed
JB		 2275 blk_queue_rq_timeout(STp->device->request_queue,
2276 value * HZ);
1da177e4
LT		 2277 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2278 name, value) );
2279 }
2280 } else if (code == MT_ST_SET_CLN) {
2281 value = (options & ~MT_ST_OPTIONS) & 0xff;
2282 if (value != 0 &&
2283 value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
2284 return (-EINVAL);
2285 STp->cln_mode = value;
2286 STp->cln_sense_mask = (options >> 8) & 0xff;
2287 STp->cln_sense_value = (options >> 16) & 0xff;
2288 printk(KERN_INFO
2289 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2290 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2291 } else if (code == MT_ST_DEF_OPTIONS) {
2292 code = (options & ~MT_ST_CLEAR_DEFAULT);
2293 value = (options & MT_ST_CLEAR_DEFAULT);
2294 if (code == MT_ST_DEF_DENSITY) {
2295 if (value == MT_ST_CLEAR_DEFAULT) {
2296 STm->default_density = (-1);
2297 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2298 name));
2299 } else {
2300 STm->default_density = value & 0xff;
2301 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2302 name, STm->default_density));
2303 if (STp->ready == ST_READY) {
2304 STp->density_changed = 0;
2305 set_mode_densblk(STp, STm);
2306 }
2307 }
2308 } else if (code == MT_ST_DEF_DRVBUFFER) {
2309 if (value == MT_ST_CLEAR_DEFAULT) {
2310 STp->default_drvbuffer = 0xff;
2311 DEBC( printk(KERN_INFO
2312 "%s: Drive buffer default disabled.\n", name));
2313 } else {
2314 STp->default_drvbuffer = value & 7;
2315 DEBC( printk(KERN_INFO
2316 "%s: Drive buffer default set to %x\n",
2317 name, STp->default_drvbuffer));
2318 if (STp->ready == ST_READY)
2319 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2320 }
2321 } else if (code == MT_ST_DEF_COMPRESSION) {
2322 if (value == MT_ST_CLEAR_DEFAULT) {
2323 STm->default_compression = ST_DONT_TOUCH;
2324 DEBC( printk(KERN_INFO
2325 "%s: Compression default disabled.\n", name));
2326 } else {
2327 if ((value & 0xff00) != 0) {
2328 STp->c_algo = (value & 0xff00) >> 8;
2329 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2330 name, STp->c_algo));
2331 }
2332 if ((value & 0xff) != 0xff) {
2333 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2334 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2335 name, (value & 1)));
2336 if (STp->ready == ST_READY) {
2337 STp->compression_changed = 0;
2338 st_compression(STp, (STm->default_compression == ST_YES));
2339 }
2340 }
2341 }
2342 }
2343 } else
2344 return (-EIO);
2345
2346 return 0;
2347}
2348\f
2349#define MODE_HEADER_LENGTH 4
2350
2351/* Mode header and page byte offsets */
2352#define MH_OFF_DATA_LENGTH 0
2353#define MH_OFF_MEDIUM_TYPE 1
2354#define MH_OFF_DEV_SPECIFIC 2
2355#define MH_OFF_BDESCS_LENGTH 3
2356#define MP_OFF_PAGE_NBR 0
2357#define MP_OFF_PAGE_LENGTH 1
2358
2359/* Mode header and page bit masks */
2360#define MH_BIT_WP 0x80
2361#define MP_MSK_PAGE_NBR 0x3f
2362
2363/* Don't return block descriptors */
2364#define MODE_SENSE_OMIT_BDESCS 0x08
2365
2366#define MODE_SELECT_PAGE_FORMAT 0x10
2367
2368/* Read a mode page into the tape buffer. The block descriptors are included
2369 if incl_block_descs is true. The page control is ored to the page number
2370 parameter, if necessary. */
2371static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2372{
2373 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2374 struct st_request *SRpnt = NULL;
1da177e4
LT		 2375
2376 memset(cmd, 0, MAX_COMMAND_SIZE);
2377 cmd[0] = MODE_SENSE;
2378 if (omit_block_descs)
2379 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2380 cmd[2] = page;
2381 cmd[4] = 255;
2382
2383 SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE,
a02488ed 2384 STp->device->request_queue->rq_timeout, 0, 1);
1da177e4
LT		 2385 if (SRpnt == NULL)
2386 return (STp->buffer)->syscall_result;
2387
8b05b773 2388 st_release_request(SRpnt);
1da177e4
LT		 2389
2390 return (STp->buffer)->syscall_result;
2391}
2392
2393
2394/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2395 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2396static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2397{
2398 int pgo;
2399 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2400 struct st_request *SRpnt = NULL;
1da177e4
LT		 2401
2402 memset(cmd, 0, MAX_COMMAND_SIZE);
2403 cmd[0] = MODE_SELECT;
2404 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2405 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2406 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2407
2408 /* Clear reserved fields */
2409 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2410 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2411 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2412 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2413
2414 SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE,
a02488ed 2415 (slow ? STp->long_timeout : STp->device->request_queue->rq_timeout), 0, 1);
1da177e4
LT		 2416 if (SRpnt == NULL)
2417 return (STp->buffer)->syscall_result;
2418
8b05b773 2419 st_release_request(SRpnt);
1da177e4
LT		 2420
2421 return (STp->buffer)->syscall_result;
2422}
2423
2424
2425#define COMPRESSION_PAGE 0x0f
2426#define COMPRESSION_PAGE_LENGTH 16
2427
2428#define CP_OFF_DCE_DCC 2
2429#define CP_OFF_C_ALGO 7
2430
2431#define DCE_MASK 0x80
2432#define DCC_MASK 0x40
2433#define RED_MASK 0x60
2434
2435
2436/* Control the compression with mode page 15. Algorithm not changed if zero.
2437
2438 The block descriptors are read and written because Sony SDT-7000 does not
2439 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2440 Including block descriptors should not cause any harm to other drives. */
2441
2442static int st_compression(struct scsi_tape * STp, int state)
2443{
2444 int retval;
2445 int mpoffs; /* Offset to mode page start */
2446 unsigned char *b_data = (STp->buffer)->b_data;
2447 DEB( char *name = tape_name(STp); )
2448
2449 if (STp->ready != ST_READY)
2450 return (-EIO);
2451
2452 /* Read the current page contents */
2453 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2454 if (retval) {
2455 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2456 name));
2457 return (-EIO);
2458 }
2459
2460 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2461 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2462 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2463
2464 /* Check if compression can be changed */
2465 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2466 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2467 return (-EIO);
2468 }
2469
2470 /* Do the change */
2471 if (state) {
2472 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2473 if (STp->c_algo != 0)
2474 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2475 }
2476 else {
2477 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2478 if (STp->c_algo != 0)
2479 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2480 }
2481
2482 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2483 if (retval) {
2484 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2485 return (-EIO);
2486 }
2487 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2488 name, state));
2489
2490 STp->compression_changed = 1;
2491 return 0;
2492}
2493
2494
2495/* Process the load and unload commands (does unload if the load code is zero) */
2496static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2497{
2498 int retval = (-EIO), timeout;
2499 DEB( char *name = tape_name(STp); )
2500 unsigned char cmd[MAX_COMMAND_SIZE];
2501 struct st_partstat *STps;
8b05b773 2502 struct st_request *SRpnt;
1da177e4
LT		 2503
2504 if (STp->ready != ST_READY && !load_code) {
2505 if (STp->ready == ST_NO_TAPE)
2506 return (-ENOMEDIUM);
2507 else
2508 return (-EIO);
2509 }
2510
2511 memset(cmd, 0, MAX_COMMAND_SIZE);
2512 cmd[0] = START_STOP;
2513 if (load_code)
2514 cmd[4] |= 1;
2515 /*
2516 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2517 */
2518 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2519 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2520 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2521 name, (cmd[4]) ? "" : "un",
2522 load_code - MT_ST_HPLOADER_OFFSET));
2523 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2524 }
2525 if (STp->immediate) {
2526 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2527 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2528 }
2529 else
2530 timeout = STp->long_timeout;
2531
2532 DEBC(
2533 if (!load_code)
2534 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2535 else
2536 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2537 );
2538
15c920a6 2539 SRpnt = st_allocate_request(STp);
1da177e4 2540 if (!SRpnt)
15c920a6
FT		 2541 return STp->buffer->syscall_result;
2542
2543 retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, timeout,
2544 MAX_RETRIES);
2545 if (retval)
2546 goto out;
1da177e4
LT		 2547
2548 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 2549
2550 if (!retval) { /* SCSI command successful */
2551
2552 if (!load_code) {
2553 STp->rew_at_close = 0;
2554 STp->ready = ST_NO_TAPE;
2555 }
2556 else {
2557 STp->rew_at_close = STp->autorew_dev;
2558 retval = check_tape(STp, filp);
2559 if (retval > 0)
2560 retval = 0;
2561 }
2562 }
2563 else {
2564 STps = &(STp->ps[STp->partition]);
2565 STps->drv_file = STps->drv_block = (-1);
2566 }
15c920a6
FT		 2567out:
2568 st_release_request(SRpnt);
1da177e4
LT		 2569
2570 return retval;
2571}
2572\f
2573#if DEBUG
2574#define ST_DEB_FORWARD 0
2575#define ST_DEB_BACKWARD 1
2576static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2577{
2578 s32 sc;
2579
2580 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2581 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2582 if (direction)
2583 sc = -sc;
2584 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2585 direction ? "backward" : "forward", sc, units);
2586}
2587#endif
2588
2589
2590/* Internal ioctl function */
2591static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2592{
2593 int timeout;
2594 long ltmp;
2595 int ioctl_result;
2596 int chg_eof = 1;
2597 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2598 struct st_request *SRpnt;
1da177e4
LT		 2599 struct st_partstat *STps;
2600 int fileno, blkno, at_sm, undone;
2601 int datalen = 0, direction = DMA_NONE;
2602 char *name = tape_name(STp);
2603
2604 WARN_ON(STp->buffer->do_dio != 0);
2605 if (STp->ready != ST_READY) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611 timeout = STp->long_timeout;
2612 STps = &(STp->ps[STp->partition]);
2613 fileno = STps->drv_file;
2614 blkno = STps->drv_block;
2615 at_sm = STps->at_sm;
2616
2617 memset(cmd, 0, MAX_COMMAND_SIZE);
2618 switch (cmd_in) {
2619 case MTFSFM:
2620 chg_eof = 0; /* Changed from the FSF after this */
2621 case MTFSF:
2622 cmd[0] = SPACE;
2623 cmd[1] = 0x01; /* Space FileMarks */
2624 cmd[2] = (arg >> 16);
2625 cmd[3] = (arg >> 8);
2626 cmd[4] = arg;
2627 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2628 if (fileno >= 0)
2629 fileno += arg;
2630 blkno = 0;
2631 at_sm &= (arg == 0);
2632 break;
2633 case MTBSFM:
2634 chg_eof = 0; /* Changed from the FSF after this */
2635 case MTBSF:
2636 cmd[0] = SPACE;
2637 cmd[1] = 0x01; /* Space FileMarks */
2638 ltmp = (-arg);
2639 cmd[2] = (ltmp >> 16);
2640 cmd[3] = (ltmp >> 8);
2641 cmd[4] = ltmp;
2642 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2643 if (fileno >= 0)
2644 fileno -= arg;
2645 blkno = (-1); /* We can't know the block number */
2646 at_sm &= (arg == 0);
2647 break;
2648 case MTFSR:
2649 cmd[0] = SPACE;
2650 cmd[1] = 0x00; /* Space Blocks */
2651 cmd[2] = (arg >> 16);
2652 cmd[3] = (arg >> 8);
2653 cmd[4] = arg;
2654 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2655 if (blkno >= 0)
2656 blkno += arg;
2657 at_sm &= (arg == 0);
2658 break;
2659 case MTBSR:
2660 cmd[0] = SPACE;
2661 cmd[1] = 0x00; /* Space Blocks */
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, "blocks", cmd);)
2667 if (blkno >= 0)
2668 blkno -= arg;
2669 at_sm &= (arg == 0);
2670 break;
2671 case MTFSS:
2672 cmd[0] = SPACE;
2673 cmd[1] = 0x04; /* Space Setmarks */
2674 cmd[2] = (arg >> 16);
2675 cmd[3] = (arg >> 8);
2676 cmd[4] = arg;
2677 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2678 if (arg != 0) {
2679 blkno = fileno = (-1);
2680 at_sm = 1;
2681 }
2682 break;
2683 case MTBSS:
2684 cmd[0] = SPACE;
2685 cmd[1] = 0x04; /* Space Setmarks */
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, "setmarks", cmd);)
2691 if (arg != 0) {
2692 blkno = fileno = (-1);
2693 at_sm = 1;
2694 }
2695 break;
2696 case MTWEOF:
2697 case MTWSM:
2698 if (STp->write_prot)
2699 return (-EACCES);
2700 cmd[0] = WRITE_FILEMARKS;
2701 if (cmd_in == MTWSM)
2702 cmd[1] = 2;
2703 cmd[2] = (arg >> 16);
2704 cmd[3] = (arg >> 8);
2705 cmd[4] = arg;
a02488ed 2706 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2707 DEBC(
2708 if (cmd_in == MTWEOF)
2709 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2710 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2711 else
2712 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2713 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2714 )
2715 if (fileno >= 0)
2716 fileno += arg;
2717 blkno = 0;
2718 at_sm = (cmd_in == MTWSM);
2719 break;
2720 case MTREW:
2721 cmd[0] = REZERO_UNIT;
2722 if (STp->immediate) {
2723 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2724 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2725 }
2726 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2727 fileno = blkno = at_sm = 0;
2728 break;
2729 case MTNOP:
2730 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2731 return 0; /* Should do something ? */
2732 break;
2733 case MTRETEN:
2734 cmd[0] = START_STOP;
2735 if (STp->immediate) {
2736 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2737 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2738 }
2739 cmd[4] = 3;
2740 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2741 fileno = blkno = at_sm = 0;
2742 break;
2743 case MTEOM:
2744 if (!STp->fast_mteom) {
2745 /* space to the end of tape */
2746 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2747 fileno = STps->drv_file;
2748 if (STps->eof >= ST_EOD_1)
2749 return 0;
2750 /* The next lines would hide the number of spaced FileMarks
2751 That's why I inserted the previous lines. I had no luck
2752 with detecting EOM with FSF, so we go now to EOM.
2753 Joerg Weule */
2754 } else
2755 fileno = (-1);
2756 cmd[0] = SPACE;
2757 cmd[1] = 3;
2758 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2759 name));
2760 blkno = -1;
2761 at_sm = 0;
2762 break;
2763 case MTERASE:
2764 if (STp->write_prot)
2765 return (-EACCES);
2766 cmd[0] = ERASE;
2767 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2768 if (STp->immediate) {
2769 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2770 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2771 }
2772 else
2773 timeout = STp->long_timeout * 8;
2774
2775 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2776 fileno = blkno = at_sm = 0;
2777 break;
2778 case MTSETBLK: /* Set block length */
2779 case MTSETDENSITY: /* Set tape density */
2780 case MTSETDRVBUFFER: /* Set drive buffering */
2781 case SET_DENS_AND_BLK: /* Set density and block size */
2782 chg_eof = 0;
2783 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2784 return (-EIO); /* Not allowed if data in buffer */
2785 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2786 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2787 STp->max_block > 0 &&
2788 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2789 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2790 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2791 return (-EINVAL);
2792 }
2793 cmd[0] = MODE_SELECT;
2794 if ((STp->use_pf & USE_PF))
2795 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2796 cmd[4] = datalen = 12;
2797 direction = DMA_TO_DEVICE;
2798
2799 memset((STp->buffer)->b_data, 0, 12);
2800 if (cmd_in == MTSETDRVBUFFER)
2801 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2802 else
2803 (STp->buffer)->b_data[2] =
2804 STp->drv_buffer << 4;
2805 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2806 if (cmd_in == MTSETDENSITY) {
2807 (STp->buffer)->b_data[4] = arg;
2808 STp->density_changed = 1; /* At least we tried ;-) */
2809 } else if (cmd_in == SET_DENS_AND_BLK)
2810 (STp->buffer)->b_data[4] = arg >> 24;
2811 else
2812 (STp->buffer)->b_data[4] = STp->density;
2813 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2814 ltmp = arg & MT_ST_BLKSIZE_MASK;
2815 if (cmd_in == MTSETBLK)
2816 STp->blksize_changed = 1; /* At least we tried ;-) */
2817 } else
2818 ltmp = STp->block_size;
2819 (STp->buffer)->b_data[9] = (ltmp >> 16);
2820 (STp->buffer)->b_data[10] = (ltmp >> 8);
2821 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2822 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2823 DEBC(
2824 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2825 printk(ST_DEB_MSG
2826 "%s: Setting block size to %d bytes.\n", name,
2827 (STp->buffer)->b_data[9] * 65536 +
2828 (STp->buffer)->b_data[10] * 256 +
2829 (STp->buffer)->b_data[11]);
2830 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2831 printk(ST_DEB_MSG
2832 "%s: Setting density code to %x.\n", name,
2833 (STp->buffer)->b_data[4]);
2834 if (cmd_in == MTSETDRVBUFFER)
2835 printk(ST_DEB_MSG
2836 "%s: Setting drive buffer code to %d.\n", name,
2837 ((STp->buffer)->b_data[2] >> 4) & 7);
2838 )
2839 break;
2840 default:
2841 return (-ENOSYS);
2842 }
2843
2844 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2845 timeout, MAX_RETRIES, 1);
2846 if (!SRpnt)
2847 return (STp->buffer)->syscall_result;
2848
2849 ioctl_result = (STp->buffer)->syscall_result;
2850
2851 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2852 st_release_request(SRpnt);
1da177e4
LT		 2853 SRpnt = NULL;
2854 STps->drv_block = blkno;
2855 STps->drv_file = fileno;
2856 STps->at_sm = at_sm;
2857
2858 if (cmd_in == MTBSFM)
2859 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2860 else if (cmd_in == MTFSFM)
2861 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2862
2863 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2864 int old_block_size = STp->block_size;
2865 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2866 if (STp->block_size != 0) {
2867 if (old_block_size == 0)
2868 normalize_buffer(STp->buffer);
2869 (STp->buffer)->buffer_blocks =
2870 (STp->buffer)->buffer_size / STp->block_size;
2871 }
2872 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2873 if (cmd_in == SET_DENS_AND_BLK)
2874 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2875 } else if (cmd_in == MTSETDRVBUFFER)
2876 STp->drv_buffer = (arg & 7);
2877 else if (cmd_in == MTSETDENSITY)
2878 STp->density = arg;
2879
2880 if (cmd_in == MTEOM)
2881 STps->eof = ST_EOD;
2882 else if (cmd_in == MTFSF)
2883 STps->eof = ST_FM;
2884 else if (chg_eof)
2885 STps->eof = ST_NOEOF;
2886
2887 if (cmd_in == MTWEOF)
2888 STps->rw = ST_IDLE;
2889 } else { /* SCSI command was not completely successful. Don't return
2890 from this block without releasing the SCSI command block! */
2891 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2892
2893 if (cmdstatp->flags & SENSE_EOM) {
2894 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2895 cmd_in != MTBSR && cmd_in != MTBSS)
2896 STps->eof = ST_EOM_OK;
2897 STps->drv_block = 0;
2898 }
2899
2900 if (cmdstatp->remainder_valid)
2901 undone = (int)cmdstatp->uremainder64;
2902 else
2903 undone = 0;
2904
2905 if (cmd_in == MTWEOF &&
2906 cmdstatp->have_sense &&
91614c05
KM		 2907 (cmdstatp->flags & SENSE_EOM)) {
2908 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2909 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2910 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2911 STps->eof = ST_NOEOF;
2912 } else { /* Writing EOF(s) failed */
2913 if (fileno >= 0)
2914 fileno -= undone;
2915 if (undone < arg)
2916 STps->eof = ST_NOEOF;
2917 }
1da177e4 2918 STps->drv_file = fileno;
1da177e4
LT		 2919 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2920 if (fileno >= 0)
2921 STps->drv_file = fileno - undone;
2922 else
2923 STps->drv_file = fileno;
2924 STps->drv_block = -1;
2925 STps->eof = ST_NOEOF;
2926 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2927 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2928 undone = (-undone);
2929 if (STps->drv_file >= 0)
2930 STps->drv_file = fileno + undone;
2931 STps->drv_block = 0;
2932 STps->eof = ST_NOEOF;
2933 } else if (cmd_in == MTFSR) {
2934 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2935 if (STps->drv_file >= 0)
2936 STps->drv_file++;
2937 STps->drv_block = 0;
2938 STps->eof = ST_FM;
2939 } else {
2940 if (blkno >= undone)
2941 STps->drv_block = blkno - undone;
2942 else
2943 STps->drv_block = (-1);
2944 STps->eof = ST_NOEOF;
2945 }
2946 } else if (cmd_in == MTBSR) {
2947 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2948 STps->drv_file--;
2949 STps->drv_block = (-1);
2950 } else {
2951 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2952 undone = (-undone);
2953 if (STps->drv_block >= 0)
2954 STps->drv_block = blkno + undone;
2955 }
2956 STps->eof = ST_NOEOF;
2957 } else if (cmd_in == MTEOM) {
2958 STps->drv_file = (-1);
2959 STps->drv_block = (-1);
2960 STps->eof = ST_EOD;
2961 } else if (cmd_in == MTSETBLK ||
2962 cmd_in == MTSETDENSITY ||
2963 cmd_in == MTSETDRVBUFFER ||
2964 cmd_in == SET_DENS_AND_BLK) {
2965 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2966 !(STp->use_pf & PF_TESTED)) {
2967 /* Try the other possible state of Page Format if not
2968 already tried */
2969 STp->use_pf = !STp->use_pf | PF_TESTED;
8b05b773 2970 st_release_request(SRpnt);
1da177e4
LT		 2971 SRpnt = NULL;
2972 return st_int_ioctl(STp, cmd_in, arg);
2973 }
2974 } else if (chg_eof)
2975 STps->eof = ST_NOEOF;
2976
2977 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
2978 STps->eof = ST_EOD;
2979
8b05b773 2980 st_release_request(SRpnt);
1da177e4
LT		 2981 SRpnt = NULL;
2982 }
2983
2984 return ioctl_result;
2985}
2986\f
2987
2988/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
2989 structure. */
2990
2991static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
2992 int logical)
2993{
2994 int result;
2995 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 2996 struct st_request *SRpnt;
1da177e4
LT		 2997 DEB( char *name = tape_name(STp); )
2998
2999 if (STp->ready != ST_READY)
3000 return (-EIO);
3001
3002 memset(scmd, 0, MAX_COMMAND_SIZE);
3003 if ((STp->device)->scsi_level < SCSI_2) {
3004 scmd[0] = QFA_REQUEST_BLOCK;
3005 scmd[4] = 3;
3006 } else {
3007 scmd[0] = READ_POSITION;
3008 if (!logical && !STp->scsi2_logical)
3009 scmd[1] = 1;
3010 }
3011 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
a02488ed
JB		 3012 STp->device->request_queue->rq_timeout,
3013 MAX_READY_RETRIES, 1);
1da177e4
LT		 3014 if (!SRpnt)
3015 return (STp->buffer)->syscall_result;
3016
3017 if ((STp->buffer)->syscall_result != 0 ||
3018 (STp->device->scsi_level >= SCSI_2 &&
3019 ((STp->buffer)->b_data[0] & 4) != 0)) {
3020 *block = *partition = 0;
3021 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3022 result = (-EIO);
3023 } else {
3024 result = 0;
3025 if ((STp->device)->scsi_level < SCSI_2) {
3026 *block = ((STp->buffer)->b_data[0] << 16)
3027 + ((STp->buffer)->b_data[1] << 8)
3028 + (STp->buffer)->b_data[2];
3029 *partition = 0;
3030 } else {
3031 *block = ((STp->buffer)->b_data[4] << 24)
3032 + ((STp->buffer)->b_data[5] << 16)
3033 + ((STp->buffer)->b_data[6] << 8)
3034 + (STp->buffer)->b_data[7];
3035 *partition = (STp->buffer)->b_data[1];
3036 if (((STp->buffer)->b_data[0] & 0x80) &&
3037 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3038 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3039 }
3040 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3041 *block, *partition));
3042 }
8b05b773 3043 st_release_request(SRpnt);
1da177e4
LT		 3044 SRpnt = NULL;
3045
3046 return result;
3047}
3048
3049
3050/* Set the tape block and partition. Negative partition means that only the
3051 block should be set in vendor specific way. */
3052static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3053 int logical)
3054{
3055 struct st_partstat *STps;
3056 int result, p;
3057 unsigned int blk;
3058 int timeout;
3059 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3060 struct st_request *SRpnt;
1da177e4
LT		 3061 DEB( char *name = tape_name(STp); )
3062
3063 if (STp->ready != ST_READY)
3064 return (-EIO);
3065 timeout = STp->long_timeout;
3066 STps = &(STp->ps[STp->partition]);
3067
3068 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3069 name, block, partition));
3070 DEB(if (partition < 0)
3071 return (-EIO); )
3072
3073 /* Update the location at the partition we are leaving */
3074 if ((!STp->can_partitions && partition != 0) ||
3075 partition >= ST_NBR_PARTITIONS)
3076 return (-EINVAL);
3077 if (partition != STp->partition) {
3078 if (get_location(STp, &blk, &p, 1))
3079 STps->last_block_valid = 0;
3080 else {
3081 STps->last_block_valid = 1;
3082 STps->last_block_visited = blk;
3083 DEBC(printk(ST_DEB_MSG
3084 "%s: Visited block %d for partition %d saved.\n",
3085 name, blk, STp->partition));
3086 }
3087 }
3088
3089 memset(scmd, 0, MAX_COMMAND_SIZE);
3090 if ((STp->device)->scsi_level < SCSI_2) {
3091 scmd[0] = QFA_SEEK_BLOCK;
3092 scmd[2] = (block >> 16);
3093 scmd[3] = (block >> 8);
3094 scmd[4] = block;
3095 scmd[5] = 0;
3096 } else {
3097 scmd[0] = SEEK_10;
3098 scmd[3] = (block >> 24);
3099 scmd[4] = (block >> 16);
3100 scmd[5] = (block >> 8);
3101 scmd[6] = block;
3102 if (!logical && !STp->scsi2_logical)
3103 scmd[1] = 4;
3104 if (STp->partition != partition) {
3105 scmd[1] |= 2;
3106 scmd[8] = partition;
3107 DEBC(printk(ST_DEB_MSG
3108 "%s: Trying to change partition from %d to %d\n",
3109 name, STp->partition, partition));
3110 }
3111 }
3112 if (STp->immediate) {
3113 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3114 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3115 }
3116
3c0bf16c 3117 SRpnt = st_allocate_request(STp);
1da177e4 3118 if (!SRpnt)
3c0bf16c
FT		 3119 return STp->buffer->syscall_result;
3120
3121 result = st_scsi_kern_execute(SRpnt, scmd, DMA_NONE, NULL, 0,
3122 timeout, MAX_READY_RETRIES);
3123 if (result)
3124 goto out;
1da177e4
LT		 3125
3126 STps->drv_block = STps->drv_file = (-1);
3127 STps->eof = ST_NOEOF;
3128 if ((STp->buffer)->syscall_result != 0) {
3129 result = (-EIO);
3130 if (STp->can_partitions &&
3131 (STp->device)->scsi_level >= SCSI_2 &&
3132 (p = find_partition(STp)) >= 0)
3133 STp->partition = p;
3134 } else {
3135 if (STp->can_partitions) {
3136 STp->partition = partition;
3137 STps = &(STp->ps[partition]);
3138 if (!STps->last_block_valid ||
3139 STps->last_block_visited != block) {
3140 STps->at_sm = 0;
3141 STps->rw = ST_IDLE;
3142 }
3143 } else
3144 STps->at_sm = 0;
3145 if (block == 0)
3146 STps->drv_block = STps->drv_file = 0;
3147 result = 0;
3148 }
3c0bf16c 3149out:
8b05b773 3150 st_release_request(SRpnt);
1da177e4
LT		 3151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Find the current partition number for the drive status. Called from open and
3158 returns either partition number of negative error code. */
3159static int find_partition(struct scsi_tape *STp)
3160{
3161 int i, partition;
3162 unsigned int block;
3163
3164 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3165 return i;
3166 if (partition >= ST_NBR_PARTITIONS)
3167 return (-EIO);
3168 return partition;
3169}
3170
3171
3172/* Change the partition if necessary */
3173static int switch_partition(struct scsi_tape *STp)
3174{
3175 struct st_partstat *STps;
3176
3177 if (STp->partition == STp->new_partition)
3178 return 0;
3179 STps = &(STp->ps[STp->new_partition]);
3180 if (!STps->last_block_valid)
3181 STps->last_block_visited = 0;
3182 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3183}
3184\f
3185/* Functions for reading and writing the medium partition mode page. */
3186
3187#define PART_PAGE 0x11
3188#define PART_PAGE_FIXED_LENGTH 8
3189
3190#define PP_OFF_MAX_ADD_PARTS 2
3191#define PP_OFF_NBR_ADD_PARTS 3
3192#define PP_OFF_FLAGS 4
3193#define PP_OFF_PART_UNITS 6
3194#define PP_OFF_RESERVED 7
3195
3196#define PP_BIT_IDP 0x20
3197#define PP_MSK_PSUM_MB 0x10
3198
3199/* Get the number of partitions on the tape. As a side effect reads the
3200 mode page into the tape buffer. */
3201static int nbr_partitions(struct scsi_tape *STp)
3202{
3203 int result;
3204 DEB( char *name = tape_name(STp); )
3205
3206 if (STp->ready != ST_READY)
3207 return (-EIO);
3208
3209 result = read_mode_page(STp, PART_PAGE, 1);
3210
3211 if (result) {
3212 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3213 name));
3214 result = (-EIO);
3215 } else {
3216 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3217 PP_OFF_NBR_ADD_PARTS] + 1;
3218 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3219 }
3220
3221 return result;
3222}
3223
3224
3225/* Partition the tape into two partitions if size > 0 or one partition if
3226 size == 0.
3227
3228 The block descriptors are read and written because Sony SDT-7000 does not
3229 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3230
3231 My HP C1533A drive returns only one partition size field. This is used to
3232 set the size of partition 1. There is no size field for the default partition.
3233 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3234 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3235 The following algorithm is used to accommodate both drives: if the number of
3236 partition size fields is greater than the maximum number of additional partitions
3237 in the mode page, the second field is used. Otherwise the first field is used.
3238
3239 For Seagate DDS drives the page length must be 8 when no partitions is defined
3240 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3241 is acceptable also to some other old drives and enforced if the first partition
3242 size field is used for the first additional partition size.
3243 */
3244static int partition_tape(struct scsi_tape *STp, int size)
3245{
3246 char *name = tape_name(STp);
3247 int result;
3248 int pgo, psd_cnt, psdo;
3249 unsigned char *bp;
3250
3251 result = read_mode_page(STp, PART_PAGE, 0);
3252 if (result) {
3253 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3254 return result;
3255 }
3256 /* The mode page is in the buffer. Let's modify it and write it. */
3257 bp = (STp->buffer)->b_data;
3258 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3259 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3260 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3261
3262 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3263 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3264 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3265 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3266 psdo += 2;
3267 }
3268 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3269
3270 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3271 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3272 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3273
3274 if (size <= 0) {
3275 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3276 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3277 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3278 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3279 name));
3280 } else {
3281 bp[psdo] = (size >> 8) & 0xff;
3282 bp[psdo + 1] = size & 0xff;
3283 bp[pgo + 3] = 1;
3284 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3285 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3286 DEBC(printk(ST_DEB_MSG
3287 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3288 name, size));
3289 }
3290 bp[pgo + PP_OFF_PART_UNITS] = 0;
3291 bp[pgo + PP_OFF_RESERVED] = 0;
3292 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3293
3294 result = write_mode_page(STp, PART_PAGE, 1);
3295 if (result) {
3296 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3297 result = (-EIO);
3298 }
3299
3300 return result;
3301}
3302\f
3303
3304
3305/* The ioctl command */
fd66c1b4 3306static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 3307{
3308 int i, cmd_nr, cmd_type, bt;
3309 int retval = 0;
3310 unsigned int blk;
3311 struct scsi_tape *STp = file->private_data;
3312 struct st_modedef *STm;
3313 struct st_partstat *STps;
3314 char *name = tape_name(STp);
3315 void __user *p = (void __user *)arg;
3316
28f85009 3317 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3318 return -ERESTARTSYS;
3319
3320 DEB(
3321 if (debugging && !STp->in_use) {
3322 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3323 retval = (-EIO);
3324 goto out;
3325 } ) /* end DEB */
3326
3327 STm = &(STp->modes[STp->current_mode]);
3328 STps = &(STp->ps[STp->partition]);
3329
3330 /*
3331 * If we are in the middle of error recovery, don't let anyone
3332 * else try and use this device. Also, if error recovery fails, it
3333 * may try and take the device offline, in which case all further
3334 * access to the device is prohibited.
3335 */
83ff6fe8
AV		 3336 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3337 file->f_flags & O_NDELAY);
1da177e4
LT		 3338 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3339 goto out;
3340 retval = 0;
3341
3342 cmd_type = _IOC_TYPE(cmd_in);
3343 cmd_nr = _IOC_NR(cmd_in);
3344
3345 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3346 struct mtop mtc;
3347
3348 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3349 retval = (-EINVAL);
3350 goto out;
3351 }
3352
3353 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3354 if (i) {
3355 retval = (-EFAULT);
3356 goto out;
3357 }
3358
3359 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3360 printk(KERN_WARNING
3361 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3362 retval = (-EPERM);
3363 goto out;
3364 }
3365 if (!STm->defined &&
3366 (mtc.mt_op != MTSETDRVBUFFER &&
3367 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3368 retval = (-ENXIO);
3369 goto out;
3370 }
3371
3372 if (!STp->pos_unknown) {
3373
3374 if (STps->eof == ST_FM_HIT) {
3375 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3376 mtc.mt_op == MTEOM) {
3377 mtc.mt_count -= 1;
3378 if (STps->drv_file >= 0)
3379 STps->drv_file += 1;
3380 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3381 mtc.mt_count += 1;
3382 if (STps->drv_file >= 0)
3383 STps->drv_file += 1;
3384 }
3385 }
3386
3387 if (mtc.mt_op == MTSEEK) {
3388 /* Old position must be restored if partition will be
3389 changed */
3390 i = !STp->can_partitions ||
3391 (STp->new_partition != STp->partition);
3392 } else {
3393 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3394 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3395 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3396 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3397 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3398 mtc.mt_op == MTCOMPRESSION;
3399 }
3400 i = flush_buffer(STp, i);
3401 if (i < 0) {
3402 retval = i;
3403 goto out;
3404 }
3405 if (STps->rw == ST_WRITING &&
3406 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3407 mtc.mt_op == MTSEEK ||
3408 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3409 i = st_int_ioctl(STp, MTWEOF, 1);
3410 if (i < 0) {
3411 retval = i;
3412 goto out;
3413 }
3414 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3415 mtc.mt_count++;
3416 STps->rw = ST_IDLE;
3417 }
3418
3419 } else {
3420 /*
3421 * If there was a bus reset, block further access
3422 * to this device. If the user wants to rewind the tape,
3423 * then reset the flag and allow access again.
3424 */
3425 if (mtc.mt_op != MTREW &&
3426 mtc.mt_op != MTOFFL &&
3427 mtc.mt_op != MTRETEN &&
3428 mtc.mt_op != MTERASE &&
3429 mtc.mt_op != MTSEEK &&
3430 mtc.mt_op != MTEOM) {
3431 retval = (-EIO);
3432 goto out;
3433 }
3434 reset_state(STp);
3435 /* remove this when the midlevel properly clears was_reset */
3436 STp->device->was_reset = 0;
3437 }
3438
3439 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3440 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3441 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3442 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3443
3444 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3445 do_door_lock(STp, 0); /* Ignore result! */
3446
3447 if (mtc.mt_op == MTSETDRVBUFFER &&
3448 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3449 retval = st_set_options(STp, mtc.mt_count);
3450 goto out;
3451 }
3452
3453 if (mtc.mt_op == MTSETPART) {
3454 if (!STp->can_partitions ||
3455 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3456 retval = (-EINVAL);
3457 goto out;
3458 }
3459 if (mtc.mt_count >= STp->nbr_partitions &&
3460 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3461 retval = (-EIO);
3462 goto out;
3463 }
3464 if (mtc.mt_count >= STp->nbr_partitions) {
3465 retval = (-EINVAL);
3466 goto out;
3467 }
3468 STp->new_partition = mtc.mt_count;
3469 retval = 0;
3470 goto out;
3471 }
3472
3473 if (mtc.mt_op == MTMKPART) {
3474 if (!STp->can_partitions) {
3475 retval = (-EINVAL);
3476 goto out;
3477 }
3478 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3479 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3480 retval = i;
3481 goto out;
3482 }
3483 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3484 STp->ps[i].rw = ST_IDLE;
3485 STp->ps[i].at_sm = 0;
3486 STp->ps[i].last_block_valid = 0;
3487 }
3488 STp->partition = STp->new_partition = 0;
3489 STp->nbr_partitions = 1; /* Bad guess ?-) */
3490 STps->drv_block = STps->drv_file = 0;
3491 retval = 0;
3492 goto out;
3493 }
3494
3495 if (mtc.mt_op == MTSEEK) {
3496 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3497 if (!STp->can_partitions)
3498 STp->ps[0].rw = ST_IDLE;
3499 retval = i;
3500 goto out;
3501 }
3502
3503 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3504 retval = do_load_unload(STp, file, 0);
3505 goto out;
3506 }
3507
3508 if (mtc.mt_op == MTLOAD) {
3509 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3510 goto out;
3511 }
3512
3513 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3514 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3515 goto out;
3516 }
3517
3518 if (STp->can_partitions && STp->ready == ST_READY &&
3519 (i = switch_partition(STp)) < 0) {
3520 retval = i;
3521 goto out;
3522 }
3523
3524 if (mtc.mt_op == MTCOMPRESSION)
3525 retval = st_compression(STp, (mtc.mt_count & 1));
3526 else
3527 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3528 goto out;
3529 }
3530 if (!STm->defined) {
3531 retval = (-ENXIO);
3532 goto out;
3533 }
3534
3535 if ((i = flush_buffer(STp, 0)) < 0) {
3536 retval = i;
3537 goto out;
3538 }
3539 if (STp->can_partitions &&
3540 (i = switch_partition(STp)) < 0) {
3541 retval = i;
3542 goto out;
3543 }
3544
3545 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3546 struct mtget mt_status;
3547
3548 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3549 retval = (-EINVAL);
3550 goto out;
3551 }
3552
3553 mt_status.mt_type = STp->tape_type;
3554 mt_status.mt_dsreg =
3555 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3556 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3557 mt_status.mt_blkno = STps->drv_block;
3558 mt_status.mt_fileno = STps->drv_file;
3559 if (STp->block_size != 0) {
3560 if (STps->rw == ST_WRITING)
3561 mt_status.mt_blkno +=
3562 (STp->buffer)->buffer_bytes / STp->block_size;
3563 else if (STps->rw == ST_READING)
3564 mt_status.mt_blkno -=
3565 ((STp->buffer)->buffer_bytes +
3566 STp->block_size - 1) / STp->block_size;
3567 }
3568
3569 mt_status.mt_gstat = 0;
3570 if (STp->drv_write_prot)
3571 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3572 if (mt_status.mt_blkno == 0) {
3573 if (mt_status.mt_fileno == 0)
3574 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3575 else
3576 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3577 }
3578 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3579 mt_status.mt_resid = STp->partition;
3580 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3581 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3582 else if (STps->eof >= ST_EOM_OK)
3583 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3584 if (STp->density == 1)
3585 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3586 else if (STp->density == 2)
3587 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3588 else if (STp->density == 3)
3589 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3590 if (STp->ready == ST_READY)
3591 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3592 if (STp->ready == ST_NO_TAPE)
3593 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3594 if (STps->at_sm)
3595 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3596 if (STm->do_async_writes ||
3597 (STm->do_buffer_writes && STp->block_size != 0) ||
3598 STp->drv_buffer != 0)
3599 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3600 if (STp->cleaning_req)
3601 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3602
3603 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3604 if (i) {
3605 retval = (-EFAULT);
3606 goto out;
3607 }
3608
3609 STp->recover_reg = 0; /* Clear after read */
3610 retval = 0;
3611 goto out;
3612 } /* End of MTIOCGET */
3613 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3614 struct mtpos mt_pos;
3615 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3616 retval = (-EINVAL);
3617 goto out;
3618 }
3619 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3620 retval = i;
3621 goto out;
3622 }
3623 mt_pos.mt_blkno = blk;
3624 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3625 if (i)
3626 retval = (-EFAULT);
3627 goto out;
3628 }
28f85009 3629 mutex_unlock(&STp->lock);
1da177e4
LT		 3630 switch (cmd_in) {
3631 case SCSI_IOCTL_GET_IDLUN:
3632 case SCSI_IOCTL_GET_BUS_NUMBER:
3633 break;
3634 default:
16c4b3e2
KM		 3635 if ((cmd_in == SG_IO ||
3636 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3637 cmd_in == CDROM_SEND_PACKET) &&
3638 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3639 i = -EPERM;
3640 else
74f3c8af
AV		 3641 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3642 file->f_mode, cmd_in, p);
1da177e4
LT		 3643 if (i != -ENOTTY)
3644 return i;
3645 break;
3646 }
16c4b3e2
KM		 3647 retval = scsi_ioctl(STp->device, cmd_in, p);
3648 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3649 STp->rew_at_close = 0;
3650 STp->ready = ST_NO_TAPE;
3651 }
3652 return retval;
1da177e4
LT		 3653
3654 out:
28f85009 3655 mutex_unlock(&STp->lock);
1da177e4
LT		 3656 return retval;
3657}
3658
3659#ifdef CONFIG_COMPAT
3660static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3661{
3662 struct scsi_tape *STp = file->private_data;
3663 struct scsi_device *sdev = STp->device;
3664 int ret = -ENOIOCTLCMD;
3665 if (sdev->host->hostt->compat_ioctl) {
3666
3667 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3668
3669 }
3670 return ret;
3671}
3672#endif
3673
3674\f
3675
3676/* Try to allocate a new tape buffer. Calling function must not hold
3677 dev_arr_lock. */
3678static struct st_buffer *
3679 new_tape_buffer(int from_initialization, int need_dma, int max_sg)
3680{
8b05b773 3681 int i, got = 0;
c53033f6 3682 gfp_t priority;
1da177e4
LT		 3683 struct st_buffer *tb;
3684
3685 if (from_initialization)
3686 priority = GFP_ATOMIC;
3687 else
3688 priority = GFP_KERNEL;
3689
3690 i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) +
3691 max_sg * sizeof(struct st_buf_fragment);
24669f75 3692 tb = kzalloc(i, priority);
1da177e4
LT		 3693 if (!tb) {
3694 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3695 return NULL;
3696 }
8b05b773 3697 tb->frp_segs = tb->orig_frp_segs = 0;
1da177e4 3698 tb->use_sg = max_sg;
1da177e4
LT		 3699 tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg);
3700
1da177e4
LT		 3701 tb->dma = need_dma;
3702 tb->buffer_size = got;
cd81621c 3703 sg_init_table(tb->sg, max_sg);
1da177e4
LT		 3704
3705 return tb;
3706}
3707
3708
3709/* Try to allocate enough space in the tape buffer */
3710static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3711{
c53033f6
AV		 3712 int segs, nbr, max_segs, b_size, order, got;
3713 gfp_t priority;
1da177e4
LT		 3714
3715 if (new_size <= STbuffer->buffer_size)
3716 return 1;
3717
3718 if (STbuffer->buffer_size <= PAGE_SIZE)
3719 normalize_buffer(STbuffer); /* Avoid extra segment */
3720
3721 max_segs = STbuffer->use_sg;
3722 nbr = max_segs - STbuffer->frp_segs;
3723 if (nbr <= 0)
3724 return 0;
3725
3726 priority = GFP_KERNEL | __GFP_NOWARN;
3727 if (need_dma)
3728 priority |= GFP_DMA;
8b05b773 3729 for (b_size = PAGE_SIZE, order=0; order <= 6 &&
1da177e4
LT		 3730 b_size < new_size - STbuffer->buffer_size;
3731 order++, b_size *= 2)
3732 ; /* empty */
3733
3734 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3735 segs < max_segs && got < new_size;) {
3736 STbuffer->frp[segs].page = alloc_pages(priority, order);
3737 if (STbuffer->frp[segs].page == NULL) {
3738 if (new_size - got <= (max_segs - segs) * b_size / 2) {
3739 b_size /= 2; /* Large enough for the rest of the buffers */
3740 order--;
3741 continue;
3742 }
3743 DEB(STbuffer->buffer_size = got);
3744 normalize_buffer(STbuffer);
3745 return 0;
3746 }
3747 STbuffer->frp[segs].length = b_size;
3748 STbuffer->frp_segs += 1;
3749 got += b_size;
3750 STbuffer->buffer_size = got;
40f6b36c
KM		 3751 if (STbuffer->cleared)
3752 memset(page_address(STbuffer->frp[segs].page), 0, b_size);
1da177e4
LT		 3753 segs++;
3754 }
3755 STbuffer->b_data = page_address(STbuffer->frp[0].page);
3756
3757 return 1;
3758}
3759
3760
40f6b36c
KM		 3761/* Make sure that no data from previous user is in the internal buffer */
3762static void clear_buffer(struct st_buffer * st_bp)
3763{
3764 int i;
3765
3766 for (i=0; i < st_bp->frp_segs; i++)
3767 memset(page_address(st_bp->frp[i].page), 0, st_bp->frp[i].length);
3768 st_bp->cleared = 1;
3769}
3770
3771
1da177e4
LT		 3772/* Release the extra buffer */
3773static void normalize_buffer(struct st_buffer * STbuffer)
3774{
3775 int i, order;
3776
3777 for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) {
3778 order = get_order(STbuffer->frp[i].length);
3779 __free_pages(STbuffer->frp[i].page, order);
3780 STbuffer->buffer_size -= STbuffer->frp[i].length;
3781 }
3782 STbuffer->frp_segs = STbuffer->orig_frp_segs;
3783 STbuffer->frp_sg_current = 0;
8b05b773 3784 STbuffer->sg_segs = 0;
1da177e4
LT		 3785}
3786
3787
3788/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3789 negative error code. */
3790static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3791{
3792 int i, cnt, res, offset;
3793
3794 for (i = 0, offset = st_bp->buffer_bytes;
3795 i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++)
3796 offset -= st_bp->frp[i].length;
3797 if (i == st_bp->frp_segs) { /* Should never happen */
3798 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3799 return (-EIO);
3800 }
3801 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3802 cnt = st_bp->frp[i].length - offset < do_count ?
3803 st_bp->frp[i].length - offset : do_count;
3804 res = copy_from_user(page_address(st_bp->frp[i].page) + offset, ubp, cnt);
3805 if (res)
3806 return (-EFAULT);
3807 do_count -= cnt;
3808 st_bp->buffer_bytes += cnt;
3809 ubp += cnt;
3810 offset = 0;
3811 }
3812 if (do_count) /* Should never happen */
3813 return (-EIO);
3814
3815 return 0;
3816}
3817
3818
3819/* Move data from the tape buffer to the user buffer. Returns zero (success) or
3820 negative error code. */
3821static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3822{
3823 int i, cnt, res, offset;
3824
3825 for (i = 0, offset = st_bp->read_pointer;
3826 i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++)
3827 offset -= st_bp->frp[i].length;
3828 if (i == st_bp->frp_segs) { /* Should never happen */
3829 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3830 return (-EIO);
3831 }
3832 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3833 cnt = st_bp->frp[i].length - offset < do_count ?
3834 st_bp->frp[i].length - offset : do_count;
3835 res = copy_to_user(ubp, page_address(st_bp->frp[i].page) + offset, cnt);
3836 if (res)
3837 return (-EFAULT);
3838 do_count -= cnt;
3839 st_bp->buffer_bytes -= cnt;
3840 st_bp->read_pointer += cnt;
3841 ubp += cnt;
3842 offset = 0;
3843 }
3844 if (do_count) /* Should never happen */
3845 return (-EIO);
3846
3847 return 0;
3848}
3849
3850
3851/* Move data towards start of buffer */
3852static void move_buffer_data(struct st_buffer * st_bp, int offset)
3853{
3854 int src_seg, dst_seg, src_offset = 0, dst_offset;
3855 int count, total;
3856
3857 if (offset == 0)
3858 return;
3859
3860 total=st_bp->buffer_bytes - offset;
3861 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3862 src_offset = offset;
3863 if (src_offset < st_bp->frp[src_seg].length)
3864 break;
3865 offset -= st_bp->frp[src_seg].length;
3866 }
3867
3868 st_bp->buffer_bytes = st_bp->read_pointer = total;
3869 for (dst_seg=dst_offset=0; total > 0; ) {
3870 count = min(st_bp->frp[dst_seg].length - dst_offset,
3871 st_bp->frp[src_seg].length - src_offset);
3872 memmove(page_address(st_bp->frp[dst_seg].page) + dst_offset,
3873 page_address(st_bp->frp[src_seg].page) + src_offset, count);
3874 src_offset += count;
3875 if (src_offset >= st_bp->frp[src_seg].length) {
3876 src_seg++;
3877 src_offset = 0;
3878 }
3879 dst_offset += count;
3880 if (dst_offset >= st_bp->frp[dst_seg].length) {
3881 dst_seg++;
3882 dst_offset = 0;
3883 }
3884 total -= count;
3885 }
3886}
3887
3888
3889/* Fill the s/g list up to the length required for this transfer */
3890static void buf_to_sg(struct st_buffer *STbp, unsigned int length)
3891{
3892 int i;
3893 unsigned int count;
3894 struct scatterlist *sg;
3895 struct st_buf_fragment *frp;
3896
3897 if (length == STbp->frp_sg_current)
3898 return; /* work already done */
3899
3900 sg = &(STbp->sg[0]);
3901 frp = STbp->frp;
3902 for (i=count=0; count < length; i++) {
1da177e4 3903 if (length - count > frp[i].length)
642f1490 3904 sg_set_page(&sg[i], frp[i].page, frp[i].length, 0);
1da177e4 3905 else
642f1490 3906 sg_set_page(&sg[i], frp[i].page, length - count, 0);
1da177e4 3907 count += sg[i].length;
1da177e4
LT		 3908 }
3909 STbp->sg_segs = i;
3910 STbp->frp_sg_current = length;
3911}
3912
3913
3914/* Validate the options from command line or module parameters */
3915static void validate_options(void)
3916{
3917 if (buffer_kbs > 0)
3918 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3919 if (max_sg_segs >= ST_FIRST_SG)
3920 st_max_sg_segs = max_sg_segs;
3921}
3922
3923#ifndef MODULE
3924/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3925 */
3926static int __init st_setup(char *str)
3927{
3928 int i, len, ints[5];
3929 char *stp;
3930
3931 stp = get_options(str, ARRAY_SIZE(ints), ints);
3932
3933 if (ints[0] > 0) {
3934 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3935 if (parms[i].val)
3936 *parms[i].val = ints[i + 1];
3937 } else {
3938 while (stp != NULL) {
3939 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3940 len = strlen(parms[i].name);
3941 if (!strncmp(stp, parms[i].name, len) &&
3942 (*(stp + len) == ':' || *(stp + len) == '=')) {
3943 if (parms[i].val)
3944 *parms[i].val =
3945 simple_strtoul(stp + len + 1, NULL, 0);
3946 else
3947 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3948 parms[i].name);
3949 break;
3950 }
3951 }
6391a113 3952 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 3953 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3954 stp);
3955 stp = strchr(stp, ',');
3956 if (stp)
3957 stp++;
3958 }
3959 }
3960
3961 validate_options();
3962
3963 return 1;
3964}
3965
3966__setup("st=", st_setup);
3967
3968#endif
3969
00977a59 3970static const struct file_operations st_fops =
1da177e4
LT		 3971{
3972 .owner = THIS_MODULE,
3973 .read = st_read,
3974 .write = st_write,
fd66c1b4 3975 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 3976#ifdef CONFIG_COMPAT
3977 .compat_ioctl = st_compat_ioctl,
3978#endif
3979 .open = st_open,
3980 .flush = st_flush,
3981 .release = st_release,
3982};
3983
3984static int st_probe(struct device *dev)
3985{
3986 struct scsi_device *SDp = to_scsi_device(dev);
3987 struct gendisk *disk = NULL;
3988 struct cdev *cdev = NULL;
3989 struct scsi_tape *tpnt = NULL;
3990 struct st_modedef *STm;
3991 struct st_partstat *STps;
3992 struct st_buffer *buffer;
3993 int i, j, mode, dev_num, error;
3994 char *stp;
1da177e4
LT		 3995
3996 if (SDp->type != TYPE_TAPE)
3997 return -ENODEV;
3998 if ((stp = st_incompatible(SDp))) {
3bf743e7 3999 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
1da177e4
LT		 4000 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
4001 return -ENODEV;
4002 }
4003
8b05b773
MC		 4004 i = min(SDp->request_queue->max_hw_segments,
4005 SDp->request_queue->max_phys_segments);
1da177e4
LT		 4006 if (st_max_sg_segs < i)
4007 i = st_max_sg_segs;
4008 buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i);
4009 if (buffer == NULL) {
4010 printk(KERN_ERR
4011 "st: Can't allocate new tape buffer. Device not attached.\n");
4012 goto out;
4013 }
4014
4015 disk = alloc_disk(1);
4016 if (!disk) {
4017 printk(KERN_ERR "st: out of memory. Device not attached.\n");
4018 goto out_buffer_free;
4019 }
4020
4021 write_lock(&st_dev_arr_lock);
4022 if (st_nr_dev >= st_dev_max) {
4023 struct scsi_tape **tmp_da;
4024 int tmp_dev_max;
4025
4026 tmp_dev_max = max(st_nr_dev * 2, 8);
4027 if (tmp_dev_max > ST_MAX_TAPES)
4028 tmp_dev_max = ST_MAX_TAPES;
4029 if (tmp_dev_max <= st_nr_dev) {
4030 write_unlock(&st_dev_arr_lock);
4031 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4032 ST_MAX_TAPES);
4033 goto out_put_disk;
4034 }
4035
24669f75 4036 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
1da177e4
LT		 4037 if (tmp_da == NULL) {
4038 write_unlock(&st_dev_arr_lock);
4039 printk(KERN_ERR "st: Can't extend device array.\n");
4040 goto out_put_disk;
4041 }
4042
1da177e4
LT		 4043 if (scsi_tapes != NULL) {
4044 memcpy(tmp_da, scsi_tapes,
4045 st_dev_max * sizeof(struct scsi_tape *));
4046 kfree(scsi_tapes);
4047 }
4048 scsi_tapes = tmp_da;
4049
4050 st_dev_max = tmp_dev_max;
4051 }
4052
4053 for (i = 0; i < st_dev_max; i++)
4054 if (scsi_tapes[i] == NULL)
4055 break;
4056 if (i >= st_dev_max)
4057 panic("scsi_devices corrupt (st)");
4058
24669f75 4059 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
1da177e4
LT		 4060 if (tpnt == NULL) {
4061 write_unlock(&st_dev_arr_lock);
4062 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4063 goto out_put_disk;
4064 }
f03a5670 4065 kref_init(&tpnt->kref);
1da177e4
LT		 4066 tpnt->disk = disk;
4067 sprintf(disk->disk_name, "st%d", i);
4068 disk->private_data = &tpnt->driver;
4069 disk->queue = SDp->request_queue;
4070 tpnt->driver = &st_template;
4071 scsi_tapes[i] = tpnt;
4072 dev_num = i;
4073
4074 tpnt->device = SDp;
4075 if (SDp->scsi_level <= 2)
4076 tpnt->tape_type = MT_ISSCSI1;
4077 else
4078 tpnt->tape_type = MT_ISSCSI2;
4079
4080 tpnt->buffer = buffer;
f03a5670 4081 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4082
4083 tpnt->inited = 0;
4084 tpnt->dirty = 0;
4085 tpnt->in_use = 0;
4086 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4087 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4088 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4089 tpnt->density = 0;
4090 tpnt->do_auto_lock = ST_AUTO_LOCK;
4091 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4092 tpnt->can_partitions = 0;
4093 tpnt->two_fm = ST_TWO_FM;
4094 tpnt->fast_mteom = ST_FAST_MTEOM;
4095 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4096 tpnt->sili = ST_SILI;
1da177e4
LT		 4097 tpnt->immediate = ST_NOWAIT;
4098 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4099 tpnt->partition = 0;
4100 tpnt->new_partition = 0;
4101 tpnt->nbr_partitions = 0;
a02488ed 4102 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4103 tpnt->long_timeout = ST_LONG_TIMEOUT;
4104 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4105
1da177e4
LT		 4106 for (i = 0; i < ST_NBR_MODES; i++) {
4107 STm = &(tpnt->modes[i]);
4108 STm->defined = 0;
4109 STm->sysv = ST_SYSV;
4110 STm->defaults_for_writes = 0;
4111 STm->do_async_writes = ST_ASYNC_WRITES;
4112 STm->do_buffer_writes = ST_BUFFER_WRITES;
4113 STm->do_read_ahead = ST_READ_AHEAD;
4114 STm->default_compression = ST_DONT_TOUCH;
4115 STm->default_blksize = (-1); /* No forced size */
4116 STm->default_density = (-1); /* No forced density */
4117 }
4118
4119 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4120 STps = &(tpnt->ps[i]);
4121 STps->rw = ST_IDLE;
4122 STps->eof = ST_NOEOF;
4123 STps->at_sm = 0;
4124 STps->last_block_valid = 0;
4125 STps->drv_block = (-1);
4126 STps->drv_file = (-1);
4127 }
4128
4129 tpnt->current_mode = 0;
4130 tpnt->modes[0].defined = 1;
4131
4132 tpnt->density_changed = tpnt->compression_changed =
4133 tpnt->blksize_changed = 0;
28f85009 4134 mutex_init(&tpnt->lock);
1da177e4
LT		 4135
4136 st_nr_dev++;
4137 write_unlock(&st_dev_arr_lock);
4138
4139 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4140 STm = &(tpnt->modes[mode]);
4141 for (j=0; j < 2; j++) {
4142 cdev = cdev_alloc();
4143 if (!cdev) {
4144 printk(KERN_ERR
4145 "st%d: out of memory. Device not attached.\n",
4146 dev_num);
4147 goto out_free_tape;
4148 }
4149 cdev->owner = THIS_MODULE;
4150 cdev->ops = &st_fops;
4151
4152 error = cdev_add(cdev,
4153 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4154 1);
4155 if (error) {
4156 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4157 dev_num, j ? "non" : "auto", mode);
4158 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4159 goto out_free_tape;
4160 }
4161 STm->cdevs[j] = cdev;
4162
4163 }
13026a6b
JG		 4164 error = do_create_class_files(tpnt, dev_num, mode);
4165 if (error)
4166 goto out_free_tape;
1da177e4
LT		 4167 }
4168
42252854 4169 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4170 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4171 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4172 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4173 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4174
4175 return 0;
4176
4177out_free_tape:
4178 for (mode=0; mode < ST_NBR_MODES; mode++) {
4179 STm = &(tpnt->modes[mode]);
4180 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4181 "tape");
4182 for (j=0; j < 2; j++) {
4183 if (STm->cdevs[j]) {
4184 if (cdev == STm->cdevs[j])
4185 cdev = NULL;
ee959b00
TJ		 4186 device_destroy(st_sysfs_class,
4187 MKDEV(SCSI_TAPE_MAJOR,
4188 TAPE_MINOR(i, mode, j)));
1da177e4
LT		 4189 cdev_del(STm->cdevs[j]);
4190 }
4191 }
4192 }
4193 if (cdev)
4194 cdev_del(cdev);
4195 write_lock(&st_dev_arr_lock);
4196 scsi_tapes[dev_num] = NULL;
4197 st_nr_dev--;
4198 write_unlock(&st_dev_arr_lock);
4199out_put_disk:
4200 put_disk(disk);
c9475cb0 4201 kfree(tpnt);
1da177e4
LT		 4202out_buffer_free:
4203 kfree(buffer);
4204out:
4205 return -ENODEV;
4206};
4207
4208
4209static int st_remove(struct device *dev)
4210{
4211 struct scsi_device *SDp = to_scsi_device(dev);
4212 struct scsi_tape *tpnt;
4213 int i, j, mode;
4214
4215 write_lock(&st_dev_arr_lock);
4216 for (i = 0; i < st_dev_max; i++) {
4217 tpnt = scsi_tapes[i];
4218 if (tpnt != NULL && tpnt->device == SDp) {
4219 scsi_tapes[i] = NULL;
4220 st_nr_dev--;
4221 write_unlock(&st_dev_arr_lock);
1da177e4
LT		 4222 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4223 "tape");
4224 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
1da177e4 4225 for (j=0; j < 2; j++) {
ee959b00
TJ		 4226 device_destroy(st_sysfs_class,
4227 MKDEV(SCSI_TAPE_MAJOR,
4228 TAPE_MINOR(i, mode, j)));
1da177e4
LT		 4229 cdev_del(tpnt->modes[mode].cdevs[j]);
4230 tpnt->modes[mode].cdevs[j] = NULL;
4231 }
4232 }
1da177e4 4233
0b950672 4234 mutex_lock(&st_ref_mutex);
f03a5670 4235 kref_put(&tpnt->kref, scsi_tape_release);
0b950672 4236 mutex_unlock(&st_ref_mutex);
1da177e4
LT		 4237 return 0;
4238 }
4239 }
4240
4241 write_unlock(&st_dev_arr_lock);
4242 return 0;
4243}
4244
f03a5670
KM		 4245/**
4246 * scsi_tape_release - Called to free the Scsi_Tape structure
4247 * @kref: pointer to embedded kref
4248 *
0b950672 4249 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4250 * called on last put, you should always use the scsi_tape_get()
4251 * scsi_tape_put() helpers which manipulate the semaphore directly
4252 * and never do a direct kref_put().
4253 **/
4254static void scsi_tape_release(struct kref *kref)
4255{
4256 struct scsi_tape *tpnt = to_scsi_tape(kref);
4257 struct gendisk *disk = tpnt->disk;
4258
4259 tpnt->device = NULL;
4260
4261 if (tpnt->buffer) {
4262 tpnt->buffer->orig_frp_segs = 0;
4263 normalize_buffer(tpnt->buffer);
4264 kfree(tpnt->buffer);
4265 }
4266
4267 disk->private_data = NULL;
4268 put_disk(disk);
4269 kfree(tpnt);
4270 return;
4271}
4272
1da177e4
LT		 4273static int __init init_st(void)
4274{
13026a6b
JG		 4275 int err;
4276
1da177e4
LT		 4277 validate_options();
4278
13026a6b 4279 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4280 verstr, st_fixed_buffer_size, st_max_sg_segs);
4281
d253878b 4282 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
1da177e4 4283 if (IS_ERR(st_sysfs_class)) {
1da177e4 4284 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
13026a6b 4285 return PTR_ERR(st_sysfs_class);
1da177e4
LT		 4286 }
4287
13026a6b
JG		 4288 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4289 ST_MAX_TAPE_ENTRIES, "st");
4290 if (err) {
4291 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4292 SCSI_TAPE_MAJOR);
4293 goto err_class;
1da177e4
LT		 4294 }
4295
13026a6b
JG		 4296 err = scsi_register_driver(&st_template.gendrv);
4297 if (err)
4298 goto err_chrdev;
4299
405ae7d3 4300 err = do_create_sysfs_files();
13026a6b
JG		 4301 if (err)
4302 goto err_scsidrv;
4303
4304 return 0;
4305
4306err_scsidrv:
4307 scsi_unregister_driver(&st_template.gendrv);
4308err_chrdev:
4309 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4310 ST_MAX_TAPE_ENTRIES);
4311err_class:
4312 class_destroy(st_sysfs_class);
4313 return err;
1da177e4
LT		 4314}
4315
4316static void __exit exit_st(void)
4317{
405ae7d3 4318 do_remove_sysfs_files();
1da177e4
LT		 4319 scsi_unregister_driver(&st_template.gendrv);
4320 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4321 ST_MAX_TAPE_ENTRIES);
c2c96f46 4322 class_destroy(st_sysfs_class);
1da177e4
LT		 4323 kfree(scsi_tapes);
4324 printk(KERN_INFO "st: Unloaded.\n");
4325}
4326
4327module_init(init_st);
4328module_exit(exit_st);
4329
4330
4331/* The sysfs driver interface. Read-only at the moment */
4332static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4333{
4334 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4335}
4336static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4337
4338static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4339{
4340 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4341}
4342static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4343
4344static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4345{
4346 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4347}
4348static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4349
4350static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4351{
4352 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4353}
4354static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4355
405ae7d3 4356static int do_create_sysfs_files(void)
1da177e4 4357{
405ae7d3 4358 struct device_driver *sysfs = &st_template.gendrv;
13026a6b
JG		 4359 int err;
4360
405ae7d3 4361 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
13026a6b
JG		 4362 if (err)
4363 return err;
405ae7d3 4364 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
13026a6b
JG		 4365 if (err)
4366 goto err_try_direct_io;
405ae7d3 4367 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
13026a6b
JG		 4368 if (err)
4369 goto err_attr_fixed_buf;
405ae7d3 4370 err = driver_create_file(sysfs, &driver_attr_version);
13026a6b
JG		 4371 if (err)
4372 goto err_attr_max_sg;
1da177e4 4373
13026a6b
JG		 4374 return 0;
4375
4376err_attr_max_sg:
405ae7d3 4377 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
13026a6b 4378err_attr_fixed_buf:
405ae7d3 4379 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
13026a6b 4380err_try_direct_io:
405ae7d3 4381 driver_remove_file(sysfs, &driver_attr_try_direct_io);
13026a6b 4382 return err;
1da177e4
LT		 4383}
4384
405ae7d3 4385static void do_remove_sysfs_files(void)
1da177e4 4386{
405ae7d3 4387 struct device_driver *sysfs = &st_template.gendrv;
1da177e4 4388
405ae7d3
RD		 4389 driver_remove_file(sysfs, &driver_attr_version);
4390 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4391 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4392 driver_remove_file(sysfs, &driver_attr_try_direct_io);
1da177e4
LT		 4393}
4394
4395
4396/* The sysfs simple class interface */
ee959b00
TJ		 4397static ssize_t
4398st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4399{
7d15d6a4 4400 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4401 ssize_t l = 0;
4402
4403 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4404 return l;
4405}
4406
ee959b00 4407DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
1da177e4 4408
ee959b00
TJ		 4409static ssize_t
4410st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4411{
7d15d6a4 4412 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4413 ssize_t l = 0;
4414
4415 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4416 return l;
4417}
4418
ee959b00 4419DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
1da177e4 4420
ee959b00
TJ		 4421static ssize_t
4422st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4423{
7d15d6a4 4424 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4425 ssize_t l = 0;
4426 char *fmt;
4427
4428 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4429 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4430 return l;
4431}
4432
ee959b00 4433DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
1da177e4 4434
ee959b00
TJ		 4435static ssize_t
4436st_defcompression_show(struct device *dev, struct device_attribute *attr,
4437 char *buf)
1da177e4 4438{
7d15d6a4 4439 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4440 ssize_t l = 0;
4441
4442 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4443 return l;
4444}
4445
ee959b00 4446DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
1da177e4 4447
ee959b00
TJ		 4448static ssize_t
4449st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4450{
7d15d6a4 4451 struct st_modedef *STm = dev_get_drvdata(dev);
b174be02
KM		 4452 struct scsi_tape *STp;
4453 int i, j, options;
4454 ssize_t l = 0;
4455
4456 for (i=0; i < st_dev_max; i++) {
4457 for (j=0; j < ST_NBR_MODES; j++)
4458 if (&scsi_tapes[i]->modes[j] == STm)
4459 break;
4460 if (j < ST_NBR_MODES)
4461 break;
4462 }
4463 if (i == st_dev_max)
4464 return 0; /* should never happen */
4465
4466 STp = scsi_tapes[i];
4467
4468 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4469 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4470 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4471 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4472 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4473 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4474 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4475 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4476 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4477 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4478 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4479 options |= STm->sysv ? MT_ST_SYSV : 0;
4480 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4481 options |= STp->sili ? MT_ST_SILI : 0;
4482
4483 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4484 return l;
4485}
4486
ee959b00 4487DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
b174be02 4488
13026a6b 4489static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
1da177e4
LT		 4490{
4491 int i, rew, error;
4492 char name[10];
ee959b00 4493 struct device *st_class_member;
1da177e4 4494
1da177e4
LT		 4495 for (rew=0; rew < 2; rew++) {
4496 /* Make sure that the minor numbers corresponding to the four
4497 first modes always get the same names */
4498 i = mode << (4 - ST_NBR_MODE_BITS);
4499 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4500 STp->disk->disk_name, st_formats[i]);
4501 st_class_member =
d73a1a67
GKH		 4502 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4503 MKDEV(SCSI_TAPE_MAJOR,
4504 TAPE_MINOR(dev_num, mode, rew)),
4505 &STp->modes[mode], "%s", name);
1da177e4 4506 if (IS_ERR(st_class_member)) {
ee959b00 4507 printk(KERN_WARNING "st%d: device_create failed\n",
1da177e4 4508 dev_num);
13026a6b 4509 error = PTR_ERR(st_class_member);
1da177e4
LT		 4510 goto out;
4511 }
1da177e4 4512
ee959b00
TJ		 4513 error = device_create_file(st_class_member,
4514 &dev_attr_defined);
13026a6b 4515 if (error) goto out;
ee959b00
TJ		 4516 error = device_create_file(st_class_member,
4517 &dev_attr_default_blksize);
13026a6b 4518 if (error) goto out;
ee959b00
TJ		 4519 error = device_create_file(st_class_member,
4520 &dev_attr_default_density);
13026a6b 4521 if (error) goto out;
ee959b00
TJ		 4522 error = device_create_file(st_class_member,
4523 &dev_attr_default_compression);
13026a6b 4524 if (error) goto out;
ee959b00
TJ		 4525 error = device_create_file(st_class_member,
4526 &dev_attr_options);
b174be02 4527 if (error) goto out;
13026a6b 4528
1da177e4
LT		 4529 if (mode == 0 && rew == 0) {
4530 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4531 &st_class_member->kobj,
4532 "tape");
4533 if (error) {
4534 printk(KERN_ERR
4535 "st%d: Can't create sysfs link from SCSI device.\n",
4536 dev_num);
13026a6b 4537 goto out;
1da177e4
LT		 4538 }
4539 }
4540 }
13026a6b
JG		 4541
4542 return 0;
4543
4544out:
4545 return error;
1da177e4
LT		 4546}
4547
1da177e4
LT		 4548/* The following functions may be useful for a larger audience. */
4549static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
4550 unsigned long uaddr, size_t count, int rw)
4551{
07542b83
JB		 4552 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4553 unsigned long start = uaddr >> PAGE_SHIFT;
4554 const int nr_pages = end - start;
1da177e4 4555 int res, i, j;
1da177e4
LT		 4556 struct page **pages;
4557
1da177e4
LT		 4558 /* User attempted Overflow! */
4559 if ((uaddr + count) < uaddr)
4560 return -EINVAL;
4561
4562 /* Too big */
4563 if (nr_pages > max_pages)
4564 return -ENOMEM;
4565
4566 /* Hmm? */
4567 if (count == 0)
4568 return 0;
4569
4570 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4571 return -ENOMEM;
4572
4573 /* Try to fault in all of the necessary pages */
4574 down_read(&current->mm->mmap_sem);
4575 /* rw==READ means read from drive, write into memory area */
4576 res = get_user_pages(
4577 current,
4578 current->mm,
4579 uaddr,
4580 nr_pages,
4581 rw == READ,
4582 0, /* don't force */
4583 pages,
4584 NULL);
4585 up_read(&current->mm->mmap_sem);
4586
4587 /* Errors and no page mapped should return here */
4588 if (res < nr_pages)
4589 goto out_unmap;
4590
4591 for (i=0; i < nr_pages; i++) {
4592 /* FIXME: flush superflous for rw==READ,
4593 * probably wrong function for rw==WRITE
4594 */
4595 flush_dcache_page(pages[i]);
4596 }
4597
4598 /* Populate the scatter/gather list */
642f1490 4599 sg_set_page(&sgl[0], pages[0], 0, uaddr & ~PAGE_MASK);
1da177e4
LT		 4600 if (nr_pages > 1) {
4601 sgl[0].length = PAGE_SIZE - sgl[0].offset;
4602 count -= sgl[0].length;
4603 for (i=1; i < nr_pages ; i++) {
642f1490
JA		 4604 sg_set_page(&sgl[i], pages[i],
4605 count < PAGE_SIZE ? count : PAGE_SIZE, 0);;
1da177e4
LT		 4606 count -= PAGE_SIZE;
4607 }
4608 }
4609 else {
4610 sgl[0].length = count;
4611 }
4612
4613 kfree(pages);
4614 return nr_pages;
4615
4616 out_unmap:
4617 if (res > 0) {
4618 for (j=0; j < res; j++)
4619 page_cache_release(pages[j]);
6bc733e9 4620 res = 0;
1da177e4
LT		 4621 }
4622 kfree(pages);
4623 return res;
4624}
4625
4626
4627/* And unmap them... */
4628static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
4629 int dirtied)
4630{
4631 int i;
4632
4633 for (i=0; i < nr_pages; i++) {
45711f1a 4634 struct page *page = sg_page(&sgl[i]);
b5810039 4635
b5810039
NP		 4636 if (dirtied)
4637 SetPageDirty(page);
1da177e4
LT		 4638 /* FIXME: cache flush missing for rw==READ
4639 * FIXME: call the correct reference counting function
4640 */
b5810039 4641 page_cache_release(page);
1da177e4
LT		 4642 }
4643
4644 return 0;
4645}
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