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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[linux.git] / drivers / scsi / st.c
CommitLineData
09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
bf65c846 4 file Documentation/scsi/st.rst for more information.
1da177e4
LT		 5
6 History:
7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
8 Contribution and ideas from several people including (in alphabetical
9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
11 Michael Schaefer, J"org Weule, and Eric Youngdale.
12
8038e645 13 Copyright 1992 - 2016 Kai Makisara
1da177e4
LT		 14 email [email protected]
15
16 Some small formal changes - aeb, 950809
17
18 Last modified: 18-JAN-1998 Richard Gooch <[email protected]> Devfs support
19 */
20
8038e645 21static const char *verstr = "20160209";
1da177e4
LT		 22
23#include <linux/module.h>
24
1207045d 25#include <linux/compat.h>
1da177e4
LT		 26#include <linux/fs.h>
27#include <linux/kernel.h>
174cd4b1 28#include <linux/sched/signal.h>
1da177e4
LT		 29#include <linux/mm.h>
30#include <linux/init.h>
31#include <linux/string.h>
5a0e3ad6 32#include <linux/slab.h>
1da177e4
LT		 33#include <linux/errno.h>
34#include <linux/mtio.h>
b81e0c23 35#include <linux/major.h>
16c4b3e2 36#include <linux/cdrom.h>
1da177e4
LT		 37#include <linux/ioctl.h>
38#include <linux/fcntl.h>
39#include <linux/spinlock.h>
40#include <linux/blkdev.h>
41#include <linux/moduleparam.h>
1da177e4 42#include <linux/cdev.h>
6c648d95 43#include <linux/idr.h>
1da177e4 44#include <linux/delay.h>
0b950672 45#include <linux/mutex.h>
1da177e4 46
7c0f6ba6 47#include <linux/uaccess.h>
1da177e4 48#include <asm/dma.h>
35b703db 49#include <asm/unaligned.h>
1da177e4
LT		 50
51#include <scsi/scsi.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_driver.h>
55#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h>
16c4b3e2 58#include <scsi/sg.h>
1da177e4
LT		 59
60
61/* The driver prints some debugging information on the console if DEBUG
62 is defined and non-zero. */
2bec708a
LO		 63#define DEBUG 1
64#define NO_DEBUG 0
1da177e4 65
b30d8bca 66#define ST_DEB_MSG KERN_NOTICE
1da177e4
LT		 67#if DEBUG
68/* The message level for the debug messages is currently set to KERN_NOTICE
69 so that people can easily see the messages. Later when the debugging messages
70 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
1da177e4
LT		 71#define DEB(a) a
72#define DEBC(a) if (debugging) { a ; }
73#else
74#define DEB(a)
75#define DEBC(a)
76#endif
77
78#define ST_KILOBYTE 1024
79
80#include "st_options.h"
81#include "st.h"
82
83static int buffer_kbs;
84static int max_sg_segs;
85static int try_direct_io = TRY_DIRECT_IO;
86static int try_rdio = 1;
87static int try_wdio = 1;
2bec708a 88static int debug_flag;
1da177e4 89
af23782b 90static struct class st_sysfs_class;
c69c6be5 91static const struct attribute_group *st_dev_groups[];
442d7562 92static const struct attribute_group *st_drv_groups[];
1da177e4
LT		 93
94MODULE_AUTHOR("Kai Makisara");
f018fa55 95MODULE_DESCRIPTION("SCSI tape (st) driver");
1da177e4 96MODULE_LICENSE("GPL");
f018fa55 97MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
d7b8bcb0 98MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
1da177e4
LT		 99
100/* Set 'perm' (4th argument) to 0 to disable module_param's definition
101 * of sysfs parameters (which module_param doesn't yet support).
102 * Sysfs parameters defined explicitly later.
103 */
104module_param_named(buffer_kbs, buffer_kbs, int, 0);
105MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
106module_param_named(max_sg_segs, max_sg_segs, int, 0);
107MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
108module_param_named(try_direct_io, try_direct_io, int, 0);
109MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
2bec708a
LO		 110module_param_named(debug_flag, debug_flag, int, 0);
111MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
112
1da177e4
LT		 113
114/* Extra parameters for testing */
115module_param_named(try_rdio, try_rdio, int, 0);
116MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
117module_param_named(try_wdio, try_wdio, int, 0);
118MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
119
120#ifndef MODULE
121static int write_threshold_kbs; /* retained for compatibility */
122static struct st_dev_parm {
123 char *name;
124 int *val;
125} parms[] __initdata = {
126 {
127 "buffer_kbs", &buffer_kbs
128 },
129 { /* Retained for compatibility with 2.4 */
130 "write_threshold_kbs", &write_threshold_kbs
131 },
132 {
133 "max_sg_segs", NULL
134 },
135 {
136 "try_direct_io", &try_direct_io
2bec708a
LO		 137 },
138 {
139 "debug_flag", &debug_flag
1da177e4
LT		 140 }
141};
142#endif
143
144/* Restrict the number of modes so that names for all are assigned */
145#if ST_NBR_MODES > 16
146#error "Maximum number of modes is 16"
147#endif
148/* Bit reversed order to get same names for same minors with all
149 mode counts */
0ad78200 150static const char *st_formats[] = {
1da177e4
LT		 151 "", "r", "k", "s", "l", "t", "o", "u",
152 "m", "v", "p", "x", "a", "y", "q", "z"};
153
154/* The default definitions have been moved to st_options.h */
155
156#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
157
158/* The buffer size should fit into the 24 bits for length in the
159 6-byte SCSI read and write commands. */
160#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
161#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
162#endif
163
164static int debugging = DEBUG;
165
166#define MAX_RETRIES 0
167#define MAX_WRITE_RETRIES 0
168#define MAX_READY_RETRIES 0
169#define NO_TAPE NOT_READY
170
171#define ST_TIMEOUT (900 * HZ)
172#define ST_LONG_TIMEOUT (14000 * HZ)
173
174/* Remove mode bits and auto-rewind bit (7) */
175#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
6f46f718 176 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
1da177e4
LT		 177#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
178
179/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
180#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
181 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
182
183/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
184 24 bits) */
185#define SET_DENS_AND_BLK 0x10001
186
1da177e4
LT		 187static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
188static int st_max_sg_segs = ST_MAX_SG;
189
1da177e4
LT		 190static int modes_defined;
191
aaff5eba 192static int enlarge_buffer(struct st_buffer *, int);
40f6b36c 193static void clear_buffer(struct st_buffer *);
1da177e4
LT		 194static void normalize_buffer(struct st_buffer *);
195static int append_to_buffer(const char __user *, struct st_buffer *, int);
196static int from_buffer(struct st_buffer *, char __user *, int);
197static void move_buffer_data(struct st_buffer *, int);
1da177e4 198
6620742f 199static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
1da177e4 200 unsigned long, size_t, int);
6620742f 201static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
1da177e4
LT		 202
203static int st_probe(struct device *);
204static int st_remove(struct device *);
1da177e4 205
1da177e4 206static struct scsi_driver st_template = {
1da177e4
LT		 207 .gendrv = {
208 .name = "st",
3af6b352 209 .owner = THIS_MODULE,
1da177e4
LT		 210 .probe = st_probe,
211 .remove = st_remove,
442d7562 212 .groups = st_drv_groups,
1da177e4 213 },
1da177e4
LT		 214};
215
216static int st_compression(struct scsi_tape *, int);
217
218static int find_partition(struct scsi_tape *);
219static int switch_partition(struct scsi_tape *);
220
221static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
222
f03a5670
KM		 223static void scsi_tape_release(struct kref *);
224
225#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
226
0b950672 227static DEFINE_MUTEX(st_ref_mutex);
6c648d95
JM		 228static DEFINE_SPINLOCK(st_index_lock);
229static DEFINE_SPINLOCK(st_use_lock);
230static DEFINE_IDR(st_index_idr);
231
f03a5670 232
1da177e4 233\f
1da177e4
LT		 234#ifndef SIGS_FROM_OSST
235#define SIGS_FROM_OSST \
236 {"OnStream", "SC-", "", "osst"}, \
237 {"OnStream", "DI-", "", "osst"}, \
238 {"OnStream", "DP-", "", "osst"}, \
239 {"OnStream", "USB", "", "osst"}, \
240 {"OnStream", "FW-", "", "osst"}
241#endif
242
f03a5670
KM		 243static struct scsi_tape *scsi_tape_get(int dev)
244{
245 struct scsi_tape *STp = NULL;
246
0b950672 247 mutex_lock(&st_ref_mutex);
6c648d95 248 spin_lock(&st_index_lock);
f03a5670 249
6c648d95 250 STp = idr_find(&st_index_idr, dev);
f03a5670
KM		 251 if (!STp) goto out;
252
253 kref_get(&STp->kref);
254
255 if (!STp->device)
256 goto out_put;
257
258 if (scsi_device_get(STp->device))
259 goto out_put;
260
261 goto out;
262
263out_put:
264 kref_put(&STp->kref, scsi_tape_release);
265 STp = NULL;
266out:
6c648d95 267 spin_unlock(&st_index_lock);
0b950672 268 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 269 return STp;
270}
271
272static void scsi_tape_put(struct scsi_tape *STp)
273{
274 struct scsi_device *sdev = STp->device;
275
0b950672 276 mutex_lock(&st_ref_mutex);
f03a5670
KM		 277 kref_put(&STp->kref, scsi_tape_release);
278 scsi_device_put(sdev);
0b950672 279 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 280}
281
1da177e4
LT		 282struct st_reject_data {
283 char *vendor;
284 char *model;
285 char *rev;
286 char *driver_hint; /* Name of the correct driver, NULL if unknown */
287};
288
289static struct st_reject_data reject_list[] = {
290 /* {"XXX", "Yy-", "", NULL}, example */
291 SIGS_FROM_OSST,
292 {NULL, }};
293
294/* If the device signature is on the list of incompatible drives, the
295 function returns a pointer to the name of the correct driver (if known) */
296static char * st_incompatible(struct scsi_device* SDp)
297{
298 struct st_reject_data *rp;
299
300 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
301 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
302 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
303 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
304 if (rp->driver_hint)
305 return rp->driver_hint;
306 else
307 return "unknown";
308 }
309 return NULL;
310}
311\f
312
b30d8bca 313#define st_printk(prefix, t, fmt, a...) \
45938335 314 sdev_prefix_printk(prefix, (t)->device, (t)->name, fmt, ##a)
b30d8bca
HR		 315#ifdef DEBUG
316#define DEBC_printk(t, fmt, a...) \
317 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
318#else
319#define DEBC_printk(t, fmt, a...)
320#endif
1da177e4 321
8b05b773 322static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
1da177e4
LT		 323{
324 const u8 *ucp;
8b05b773 325 const u8 *sense = SRpnt->sense;
1da177e4 326
8b05b773
MC		 327 s->have_sense = scsi_normalize_sense(SRpnt->sense,
328 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
1da177e4
LT		 329 s->flags = 0;
330
331 if (s->have_sense) {
332 s->deferred = 0;
333 s->remainder_valid =
334 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
335 switch (sense[0] & 0x7f) {
336 case 0x71:
337 s->deferred = 1;
df561f66 338 fallthrough;
1da177e4
LT		 339 case 0x70:
340 s->fixed_format = 1;
341 s->flags = sense[2] & 0xe0;
342 break;
343 case 0x73:
344 s->deferred = 1;
df561f66 345 fallthrough;
1da177e4
LT		 346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353}
354
355
356/* Convert the result to success code */
8b05b773 357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
1da177e4 358{
8b05b773 359 int result = SRpnt->result;
1da177e4
LT		 360 u8 scode;
361 DEB(const char *stp;)
45938335 362 char *name = STp->name;
1da177e4
LT		 363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
f03a5670 369 st_analyze_sense(SRpnt, cmdstatp);
1da177e4
LT		 370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
b30d8bca
HR		 376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
1da177e4 382 if (cmdstatp->have_sense)
d811b848
HR		 383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
b30d8bca 388 st_printk(KERN_WARNING, STp,
54c29086
HR		 389 "Error %x (driver bt 0, host bt 0x%x).\n",
390 result, host_byte(result));
1da177e4
LT		 391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
8b05b773
MC		 397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
4e73ea7b 399
d811b848
HR		 400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
8b05b773 408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
8b05b773 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422#if ST_RECOVERED_WRITE_FATAL
8b05b773
MC		 423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
1da177e4
LT		 425#endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
b30d8bca 430 DEB(
1da177e4 431 if (debugging) {
8b05b773 432 if (SRpnt->cmd[0] == READ_6)
1da177e4 433 stp = "read";
8b05b773 434 else if (SRpnt->cmd[0] == WRITE_6)
1da177e4
LT		 435 stp = "write";
436 else
437 stp = "ioctl";
b30d8bca
HR		 438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
1da177e4
LT		 441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447}
448
4deba245 449static struct st_request *st_allocate_request(struct scsi_tape *stp)
8b05b773 450{
4deba245
FT		 451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
b30d8bca
HR		 457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
4deba245
FT		 459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
8b05b773
MC		 466}
467
468static void st_release_request(struct st_request *streq)
469{
470 kfree(streq);
1da177e4
LT		 471}
472
05545c92
SS		 473static void st_do_stats(struct scsi_tape *STp, struct request *req)
474{
475 ktime_t now;
476
477 now = ktime_get();
82ed4db4 478 if (scsi_req(req)->cmd[0] == WRITE_6) {
05545c92
SS		 479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
17d5363b 483 if (scsi_req(req)->result) {
05545c92
SS		 484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
82ed4db4 492 } else if (scsi_req(req)->cmd[0] == READ_6) {
05545c92
SS		 493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
17d5363b 497 if (scsi_req(req)->result) {
05545c92
SS		 498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512}
513
2a842aca 514static void st_scsi_execute_end(struct request *req, blk_status_t status)
13b53b44
FT		 515{
516 struct st_request *SRpnt = req->end_io_data;
82ed4db4 517 struct scsi_request *rq = scsi_req(req);
13b53b44 518 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 519 struct bio *tmp;
13b53b44 520
17d5363b 521 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
82ed4db4 522 STp->buffer->cmdstat.residual = rq->resid_len;
13b53b44 523
05545c92
SS		 524 st_do_stats(STp, req);
525
c68bf8ee 526 tmp = SRpnt->bio;
82ed4db4
CH		 527 if (rq->sense_len)
528 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
13b53b44
FT		 529 if (SRpnt->waiting)
530 complete(SRpnt->waiting);
531
c68bf8ee 532 blk_rq_unmap_user(tmp);
0bf6d96c 533 blk_mq_free_request(req);
13b53b44
FT		 534}
535
536static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
537 int data_direction, void *buffer, unsigned bufflen,
538 int timeout, int retries)
539{
540 struct request *req;
82ed4db4 541 struct scsi_request *rq;
13b53b44
FT		 542 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
543 int err = 0;
05545c92 544 struct scsi_tape *STp = SRpnt->stp;
13b53b44 545
68ec3b81 546 req = scsi_alloc_request(SRpnt->stp->device->request_queue,
aebf526b 547 data_direction == DMA_TO_DEVICE ?
da6269da 548 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
a492f075 549 if (IS_ERR(req))
00da6a70 550 return PTR_ERR(req);
82ed4db4 551 rq = scsi_req(req);
e8064021 552 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 553
554 mdata->null_mapped = 1;
555
02ae2c0e
KM		 556 if (bufflen) {
557 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
558 GFP_KERNEL);
559 if (err) {
0bf6d96c 560 blk_mq_free_request(req);
00da6a70 561 return err;
02ae2c0e 562 }
13b53b44
FT		 563 }
564
05545c92
SS		 565 atomic64_inc(&STp->stats->in_flight);
566 if (cmd[0] == WRITE_6) {
567 atomic_set(&STp->stats->last_write_size, bufflen);
568 STp->stats->write_time = ktime_get();
569 } else if (cmd[0] == READ_6) {
570 atomic_set(&STp->stats->last_read_size, bufflen);
571 STp->stats->read_time = ktime_get();
572 } else {
573 STp->stats->other_time = ktime_get();
574 }
575
13b53b44 576 SRpnt->bio = req->bio;
82ed4db4
CH		 577 rq->cmd_len = COMMAND_SIZE(cmd[0]);
578 memset(rq->cmd, 0, BLK_MAX_CDB);
579 memcpy(rq->cmd, cmd, rq->cmd_len);
13b53b44 580 req->timeout = timeout;
64c7f1d1 581 rq->retries = retries;
13b53b44
FT		 582 req->end_io_data = SRpnt;
583
b84ba30b 584 blk_execute_rq_nowait(req, true, st_scsi_execute_end);
13b53b44
FT		 585 return 0;
586}
587
1da177e4
LT		 588/* Do the scsi command. Waits until command performed if do_wait is true.
589 Otherwise write_behind_check() is used to check that the command
590 has finished. */
8b05b773
MC		 591static struct st_request *
592st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 593 int bytes, int direction, int timeout, int retries, int do_wait)
594{
f03a5670 595 struct completion *waiting;
6d476267
FT		 596 struct rq_map_data *mdata = &STp->buffer->map_data;
597 int ret;
1da177e4 598
f03a5670
KM		 599 /* if async, make sure there's no command outstanding */
600 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 601 st_printk(KERN_ERR, STp,
602 "Async command already active.\n");
f03a5670
KM		 603 if (signal_pending(current))
604 (STp->buffer)->syscall_result = (-EINTR);
605 else
606 (STp->buffer)->syscall_result = (-EBUSY);
607 return NULL;
608 }
609
4deba245
FT		 610 if (!SRpnt) {
611 SRpnt = st_allocate_request(STp);
612 if (!SRpnt)
1da177e4 613 return NULL;
1da177e4
LT		 614 }
615
f03a5670
KM		 616 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
617 which IO is outstanding. It's nulled out when the IO completes. */
618 if (!do_wait)
619 (STp->buffer)->last_SRpnt = SRpnt;
620
621 waiting = &STp->wait;
622 init_completion(waiting);
8b05b773 623 SRpnt->waiting = waiting;
1da177e4 624
6620742f 625 if (STp->buffer->do_dio) {
c982c368 626 mdata->page_order = 0;
6620742f
FT		 627 mdata->nr_entries = STp->buffer->sg_segs;
628 mdata->pages = STp->buffer->mapped_pages;
629 } else {
c982c368 630 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 631 mdata->nr_entries =
632 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 633 mdata->pages = STp->buffer->reserved_pages;
634 mdata->offset = 0;
6d476267
FT		 635 }
636
8b05b773
MC		 637 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
638 STp->buffer->cmdstat.have_sense = 0;
639 STp->buffer->syscall_result = 0;
640
6620742f
FT		 641 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
642 retries);
6d476267 643 if (ret) {
8b05b773
MC		 644 /* could not allocate the buffer or request was too large */
645 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 646 (STp->buffer)->last_SRpnt = NULL;
6d476267 647 } else if (do_wait) {
f03a5670 648 wait_for_completion(waiting);
8b05b773 649 SRpnt->waiting = NULL;
1da177e4
LT		 650 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
651 }
8b05b773 652
1da177e4
LT		 653 return SRpnt;
654}
655
656
657/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
658 write has been correct but EOM early warning reached, -EIO if write ended in
659 error or zero if write successful. Asynchronous writes are used only in
660 variable block mode. */
661static int write_behind_check(struct scsi_tape * STp)
662{
663 int retval = 0;
664 struct st_buffer *STbuffer;
665 struct st_partstat *STps;
666 struct st_cmdstatus *cmdstatp;
8b05b773 667 struct st_request *SRpnt;
1da177e4
LT		 668
669 STbuffer = STp->buffer;
670 if (!STbuffer->writing)
671 return 0;
672
b30d8bca 673 DEB(
1da177e4
LT		 674 if (STp->write_pending)
675 STp->nbr_waits++;
676 else
677 STp->nbr_finished++;
b30d8bca 678 ) /* end DEB */
1da177e4
LT		 679
680 wait_for_completion(&(STp->wait));
f03a5670
KM		 681 SRpnt = STbuffer->last_SRpnt;
682 STbuffer->last_SRpnt = NULL;
8b05b773 683 SRpnt->waiting = NULL;
1da177e4 684
f03a5670 685 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 686 st_release_request(SRpnt);
1da177e4
LT		 687
688 STbuffer->buffer_bytes -= STbuffer->writing;
689 STps = &(STp->ps[STp->partition]);
690 if (STps->drv_block >= 0) {
691 if (STp->block_size == 0)
692 STps->drv_block++;
693 else
694 STps->drv_block += STbuffer->writing / STp->block_size;
695 }
696
697 cmdstatp = &STbuffer->cmdstat;
698 if (STbuffer->syscall_result) {
699 retval = -EIO;
700 if (cmdstatp->have_sense && !cmdstatp->deferred &&
701 (cmdstatp->flags & SENSE_EOM) &&
702 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
703 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
704 /* EOM at write-behind, has all data been written? */
705 if (!cmdstatp->remainder_valid ||
706 cmdstatp->uremainder64 == 0)
707 retval = -ENOSPC;
708 }
709 if (retval == -EIO)
710 STps->drv_block = -1;
711 }
712 STbuffer->writing = 0;
713
714 DEB(if (debugging && retval)
b30d8bca
HR		 715 st_printk(ST_DEB_MSG, STp,
716 "Async write error %x, return value %d.\n",
717 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 718
719 return retval;
720}
721
722
723/* Step over EOF if it has been inadvertently crossed (ioctl not used because
724 it messes up the block number). */
725static int cross_eof(struct scsi_tape * STp, int forward)
726{
8b05b773 727 struct st_request *SRpnt;
1da177e4
LT		 728 unsigned char cmd[MAX_COMMAND_SIZE];
729
730 cmd[0] = SPACE;
731 cmd[1] = 0x01; /* Space FileMarks */
732 if (forward) {
733 cmd[2] = cmd[3] = 0;
734 cmd[4] = 1;
735 } else
736 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
737 cmd[5] = 0;
738
b30d8bca
HR		 739 DEBC_printk(STp, "Stepping over filemark %s.\n",
740 forward ? "forward" : "backward");
1da177e4 741
02ae2c0e
KM		 742 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
743 STp->device->request_queue->rq_timeout,
744 MAX_RETRIES, 1);
1da177e4 745 if (!SRpnt)
02ae2c0e 746 return (STp->buffer)->syscall_result;
39ade4b1 747
02ae2c0e
KM		 748 st_release_request(SRpnt);
749 SRpnt = NULL;
1da177e4
LT		 750
751 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 752 st_printk(KERN_ERR, STp,
753 "Stepping over filemark %s failed.\n",
754 forward ? "forward" : "backward");
1da177e4 755
02ae2c0e 756 return (STp->buffer)->syscall_result;
1da177e4
LT		 757}
758
759
760/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 761static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 762{
786231af 763 int transfer, blks;
1da177e4
LT		 764 int result;
765 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 766 struct st_request *SRpnt;
1da177e4
LT		 767 struct st_partstat *STps;
768
769 result = write_behind_check(STp);
770 if (result)
771 return result;
772
773 result = 0;
774 if (STp->dirty == 1) {
775
786231af 776 transfer = STp->buffer->buffer_bytes;
b30d8bca 777 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 778
1da177e4
LT		 779 memset(cmd, 0, MAX_COMMAND_SIZE);
780 cmd[0] = WRITE_6;
781 cmd[1] = 1;
782 blks = transfer / STp->block_size;
783 cmd[2] = blks >> 16;
784 cmd[3] = blks >> 8;
785 cmd[4] = blks;
786
787 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 788 STp->device->request_queue->rq_timeout,
789 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 790 if (!SRpnt)
791 return (STp->buffer)->syscall_result;
792
793 STps = &(STp->ps[STp->partition]);
794 if ((STp->buffer)->syscall_result != 0) {
795 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
796
797 if (cmdstatp->have_sense && !cmdstatp->deferred &&
798 (cmdstatp->flags & SENSE_EOM) &&
799 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
800 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
801 (!cmdstatp->remainder_valid ||
802 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
803 STp->dirty = 0;
804 (STp->buffer)->buffer_bytes = 0;
805 if (STps->drv_block >= 0)
806 STps->drv_block += blks;
807 result = (-ENOSPC);
808 } else {
b30d8bca 809 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 810 STps->drv_block = (-1);
811 result = (-EIO);
812 }
813 } else {
814 if (STps->drv_block >= 0)
815 STps->drv_block += blks;
816 STp->dirty = 0;
817 (STp->buffer)->buffer_bytes = 0;
818 }
8b05b773 819 st_release_request(SRpnt);
1da177e4
LT		 820 SRpnt = NULL;
821 }
822 return result;
823}
824
825
826/* Flush the tape buffer. The tape will be positioned correctly unless
827 seek_next is true. */
828static int flush_buffer(struct scsi_tape *STp, int seek_next)
829{
830 int backspace, result;
1da177e4
LT		 831 struct st_partstat *STps;
832
1da177e4
LT		 833 /*
834 * If there was a bus reset, block further access
835 * to this device.
836 */
837 if (STp->pos_unknown)
838 return (-EIO);
839
840 if (STp->ready != ST_READY)
841 return 0;
842 STps = &(STp->ps[STp->partition]);
843 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 844 return st_flush_write_buffer(STp);
1da177e4
LT		 845
846 if (STp->block_size == 0)
847 return 0;
848
849 backspace = ((STp->buffer)->buffer_bytes +
850 (STp->buffer)->read_pointer) / STp->block_size -
851 ((STp->buffer)->read_pointer + STp->block_size - 1) /
852 STp->block_size;
853 (STp->buffer)->buffer_bytes = 0;
854 (STp->buffer)->read_pointer = 0;
855 result = 0;
856 if (!seek_next) {
857 if (STps->eof == ST_FM_HIT) {
858 result = cross_eof(STp, 0); /* Back over the EOF hit */
859 if (!result)
860 STps->eof = ST_NOEOF;
861 else {
862 if (STps->drv_file >= 0)
863 STps->drv_file++;
864 STps->drv_block = 0;
865 }
866 }
867 if (!result && backspace > 0)
868 result = st_int_ioctl(STp, MTBSR, backspace);
869 } else if (STps->eof == ST_FM_HIT) {
870 if (STps->drv_file >= 0)
871 STps->drv_file++;
872 STps->drv_block = 0;
873 STps->eof = ST_NOEOF;
874 }
875 return result;
876
877}
878\f
879/* Set the mode parameters */
880static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
881{
882 int set_it = 0;
883 unsigned long arg;
1da177e4
LT		 884
885 if (!STp->density_changed &&
886 STm->default_density >= 0 &&
887 STm->default_density != STp->density) {
888 arg = STm->default_density;
889 set_it = 1;
890 } else
891 arg = STp->density;
892 arg <<= MT_ST_DENSITY_SHIFT;
893 if (!STp->blksize_changed &&
894 STm->default_blksize >= 0 &&
895 STm->default_blksize != STp->block_size) {
896 arg |= STm->default_blksize;
897 set_it = 1;
898 } else
899 arg |= STp->block_size;
900 if (set_it &&
901 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
b30d8bca
HR		 902 st_printk(KERN_WARNING, STp,
903 "Can't set default block size to %d bytes "
904 "and density %x.\n",
905 STm->default_blksize, STm->default_density);
1da177e4
LT		 906 if (modes_defined)
907 return (-EINVAL);
908 }
909 return 0;
910}
911
912
8b05b773 913/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 914static int do_door_lock(struct scsi_tape * STp, int do_lock)
915{
dccfa688 916 int retval;
1da177e4 917
b30d8bca 918 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
dccfa688
CH		 919
920 retval = scsi_set_medium_removal(STp->device,
921 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
922 if (!retval)
1da177e4 923 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
dccfa688 924 else
1da177e4 925 STp->door_locked = ST_LOCK_FAILS;
1da177e4
LT		 926 return retval;
927}
928
929
930/* Set the internal state after reset */
931static void reset_state(struct scsi_tape *STp)
932{
933 int i;
934 struct st_partstat *STps;
935
936 STp->pos_unknown = 0;
937 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
938 STps = &(STp->ps[i]);
939 STps->rw = ST_IDLE;
940 STps->eof = ST_NOEOF;
941 STps->at_sm = 0;
942 STps->last_block_valid = 0;
943 STps->drv_block = -1;
944 STps->drv_file = -1;
945 }
946 if (STp->can_partitions) {
947 STp->partition = find_partition(STp);
948 if (STp->partition < 0)
949 STp->partition = 0;
950 STp->new_partition = STp->partition;
951 }
952}
953\f
954/* Test if the drive is ready. Returns either one of the codes below or a negative system
955 error code. */
956#define CHKRES_READY 0
957#define CHKRES_NEW_SESSION 1
958#define CHKRES_NOT_READY 2
959#define CHKRES_NO_TAPE 3
960
961#define MAX_ATTENTIONS 10
962
963static int test_ready(struct scsi_tape *STp, int do_wait)
964{
965 int attentions, waits, max_wait, scode;
966 int retval = CHKRES_READY, new_session = 0;
967 unsigned char cmd[MAX_COMMAND_SIZE];
02ae2c0e 968 struct st_request *SRpnt = NULL;
1da177e4
LT		 969 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
970
971 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
972
973 for (attentions=waits=0; ; ) {
974 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
975 cmd[0] = TEST_UNIT_READY;
02ae2c0e
KM		 976 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
977 STp->long_timeout, MAX_READY_RETRIES, 1);
1da177e4 978
02ae2c0e
KM		 979 if (!SRpnt) {
980 retval = (STp->buffer)->syscall_result;
1da177e4 981 break;
02ae2c0e 982 }
1da177e4
LT		 983
984 if (cmdstatp->have_sense) {
985
986 scode = cmdstatp->sense_hdr.sense_key;
987
988 if (scode == UNIT_ATTENTION) { /* New media? */
989 new_session = 1;
990 if (attentions < MAX_ATTENTIONS) {
991 attentions++;
992 continue;
993 }
994 else {
995 retval = (-EIO);
996 break;
997 }
998 }
999
1000 if (scode == NOT_READY) {
1001 if (waits < max_wait) {
1002 if (msleep_interruptible(1000)) {
1003 retval = (-EINTR);
1004 break;
1005 }
1006 waits++;
1007 continue;
1008 }
1009 else {
1010 if ((STp->device)->scsi_level >= SCSI_2 &&
1011 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1012 retval = CHKRES_NO_TAPE;
1013 else
1014 retval = CHKRES_NOT_READY;
1015 break;
1016 }
1017 }
1018 }
1019
1020 retval = (STp->buffer)->syscall_result;
1021 if (!retval)
1022 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1023 break;
1024 }
1025
02ae2c0e
KM		 1026 if (SRpnt != NULL)
1027 st_release_request(SRpnt);
1da177e4
LT		 1028 return retval;
1029}
1030
1031
1032/* See if the drive is ready and gather information about the tape. Return values:
1033 < 0 negative error code from errno.h
1034 0 drive ready
1035 1 drive not ready (possibly no tape)
1036*/
1037static int check_tape(struct scsi_tape *STp, struct file *filp)
1038{
1039 int i, retval, new_session = 0, do_wait;
1040 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1041 unsigned short st_flags = filp->f_flags;
8b05b773 1042 struct st_request *SRpnt = NULL;
1da177e4
LT		 1043 struct st_modedef *STm;
1044 struct st_partstat *STps;
496ad9aa 1045 struct inode *inode = file_inode(filp);
1da177e4
LT		 1046 int mode = TAPE_MODE(inode);
1047
1048 STp->ready = ST_READY;
1049
1050 if (mode != STp->current_mode) {
b30d8bca
HR		 1051 DEBC_printk(STp, "Mode change from %d to %d.\n",
1052 STp->current_mode, mode);
1da177e4
LT		 1053 new_session = 1;
1054 STp->current_mode = mode;
1055 }
1056 STm = &(STp->modes[STp->current_mode]);
1057
1058 saved_cleaning = STp->cleaning_req;
1059 STp->cleaning_req = 0;
1060
1061 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1062 retval = test_ready(STp, do_wait);
1063
1064 if (retval < 0)
1065 goto err_out;
1066
1067 if (retval == CHKRES_NEW_SESSION) {
1068 STp->pos_unknown = 0;
1069 STp->partition = STp->new_partition = 0;
1070 if (STp->can_partitions)
1071 STp->nbr_partitions = 1; /* This guess will be updated later
1072 if necessary */
1073 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1074 STps = &(STp->ps[i]);
1075 STps->rw = ST_IDLE;
1076 STps->eof = ST_NOEOF;
1077 STps->at_sm = 0;
1078 STps->last_block_valid = 0;
1079 STps->drv_block = 0;
1080 STps->drv_file = 0;
1081 }
1082 new_session = 1;
1083 }
1084 else {
1085 STp->cleaning_req |= saved_cleaning;
1086
1087 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1088 if (retval == CHKRES_NO_TAPE)
1089 STp->ready = ST_NO_TAPE;
1090 else
1091 STp->ready = ST_NOT_READY;
1092
1093 STp->density = 0; /* Clear the erroneous "residue" */
1094 STp->write_prot = 0;
1095 STp->block_size = 0;
1096 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1097 STp->partition = STp->new_partition = 0;
1098 STp->door_locked = ST_UNLOCKED;
1099 return CHKRES_NOT_READY;
1100 }
1101 }
1102
1103 if (STp->omit_blklims)
1104 STp->min_block = STp->max_block = (-1);
1105 else {
1106 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1107 cmd[0] = READ_BLOCK_LIMITS;
1108
02ae2c0e
KM		 1109 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1110 STp->device->request_queue->rq_timeout,
1111 MAX_READY_RETRIES, 1);
1112 if (!SRpnt) {
1113 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1114 goto err_out;
1115 }
1116
8b05b773 1117 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1118 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1119 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1120 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1121 (STp->buffer)->b_data[5];
1122 if ( DEB( debugging || ) !STp->inited)
b30d8bca
HR		 1123 st_printk(KERN_INFO, STp,
1124 "Block limits %d - %d bytes.\n",
1125 STp->min_block, STp->max_block);
1da177e4
LT		 1126 } else {
1127 STp->min_block = STp->max_block = (-1);
b30d8bca 1128 DEBC_printk(STp, "Can't read block limits.\n");
1da177e4
LT		 1129 }
1130 }
1131
1132 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1133 cmd[0] = MODE_SENSE;
1134 cmd[4] = 12;
1135
02ae2c0e
KM		 1136 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1137 STp->device->request_queue->rq_timeout,
1138 MAX_READY_RETRIES, 1);
1139 if (!SRpnt) {
1140 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1141 goto err_out;
1142 }
1143
1144 if ((STp->buffer)->syscall_result != 0) {
b30d8bca 1145 DEBC_printk(STp, "No Mode Sense.\n");
1da177e4
LT		 1146 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1147 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1148 STp->drv_write_prot = 0;
1149 } else {
b30d8bca
HR		 1150 DEBC_printk(STp,"Mode sense. Length %d, "
1151 "medium %x, WBS %x, BLL %d\n",
1152 (STp->buffer)->b_data[0],
1153 (STp->buffer)->b_data[1],
1154 (STp->buffer)->b_data[2],
1155 (STp->buffer)->b_data[3]);
1da177e4
LT		 1156
1157 if ((STp->buffer)->b_data[3] >= 8) {
1158 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1159 STp->density = (STp->buffer)->b_data[4];
1160 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1161 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
b30d8bca
HR		 1162 DEBC_printk(STp, "Density %x, tape length: %x, "
1163 "drv buffer: %d\n",
1164 STp->density,
1165 (STp->buffer)->b_data[5] * 65536 +
1166 (STp->buffer)->b_data[6] * 256 +
1167 (STp->buffer)->b_data[7],
1168 STp->drv_buffer);
1da177e4
LT		 1169 }
1170 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
c743e44f 1171 if (!STp->drv_buffer && STp->immediate_filemark) {
b30d8bca
HR		 1172 st_printk(KERN_WARNING, STp,
1173 "non-buffered tape: disabling "
1174 "writing immediate filemarks\n");
c743e44f
LD		 1175 STp->immediate_filemark = 0;
1176 }
1da177e4 1177 }
8b05b773 1178 st_release_request(SRpnt);
1da177e4 1179 SRpnt = NULL;
b30d8bca 1180 STp->inited = 1;
1da177e4
LT		 1181
1182 if (STp->block_size > 0)
1183 (STp->buffer)->buffer_blocks =
b30d8bca 1184 (STp->buffer)->buffer_size / STp->block_size;
1da177e4
LT		 1185 else
1186 (STp->buffer)->buffer_blocks = 1;
1187 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1188
b30d8bca
HR		 1189 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1190 STp->block_size, (STp->buffer)->buffer_size,
1191 (STp->buffer)->buffer_blocks);
1da177e4
LT		 1192
1193 if (STp->drv_write_prot) {
1194 STp->write_prot = 1;
1195
b30d8bca 1196 DEBC_printk(STp, "Write protected\n");
1da177e4
LT		 1197
1198 if (do_wait &&
1199 ((st_flags & O_ACCMODE) == O_WRONLY ||
1200 (st_flags & O_ACCMODE) == O_RDWR)) {
1201 retval = (-EROFS);
1202 goto err_out;
1203 }
1204 }
1205
1206 if (STp->can_partitions && STp->nbr_partitions < 1) {
1207 /* This code is reached when the device is opened for the first time
1208 after the driver has been initialized with tape in the drive and the
1209 partition support has been enabled. */
b30d8bca 1210 DEBC_printk(STp, "Updating partition number in status.\n");
1da177e4
LT		 1211 if ((STp->partition = find_partition(STp)) < 0) {
1212 retval = STp->partition;
1213 goto err_out;
1214 }
1215 STp->new_partition = STp->partition;
1216 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1217 }
1218
1219 if (new_session) { /* Change the drive parameters for the new mode */
1220 STp->density_changed = STp->blksize_changed = 0;
1221 STp->compression_changed = 0;
1222 if (!(STm->defaults_for_writes) &&
1223 (retval = set_mode_densblk(STp, STm)) < 0)
1224 goto err_out;
1225
1226 if (STp->default_drvbuffer != 0xff) {
1227 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
b30d8bca
HR		 1228 st_printk(KERN_WARNING, STp,
1229 "Can't set default drive "
1230 "buffering to %d.\n",
1231 STp->default_drvbuffer);
1da177e4
LT		 1232 }
1233 }
1234
1235 return CHKRES_READY;
1236
1237 err_out:
1238 return retval;
1239}
1240
1241
b3369c68 1242\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1243 module count. */
1244static int st_open(struct inode *inode, struct file *filp)
1245{
1246 int i, retval = (-EIO);
46a243f7 1247 int resumed = 0;
1da177e4
LT		 1248 struct scsi_tape *STp;
1249 struct st_partstat *STps;
1250 int dev = TAPE_NR(inode);
1da177e4
LT		 1251
1252 /*
1253 * We really want to do nonseekable_open(inode, filp); here, but some
1254 * versions of tar incorrectly call lseek on tapes and bail out if that
1255 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1256 */
1257 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1258
b3369c68 1259 if (!(STp = scsi_tape_get(dev))) {
f03a5670 1260 return -ENXIO;
b3369c68 1261 }
f03a5670 1262
1da177e4 1263 filp->private_data = STp;
1da177e4 1264
6c648d95 1265 spin_lock(&st_use_lock);
1da177e4 1266 if (STp->in_use) {
6c648d95 1267 spin_unlock(&st_use_lock);
b30d8bca 1268 DEBC_printk(STp, "Device already in use.\n");
c8c165de 1269 scsi_tape_put(STp);
1da177e4
LT		 1270 return (-EBUSY);
1271 }
1272
1da177e4 1273 STp->in_use = 1;
6c648d95 1274 spin_unlock(&st_use_lock);
1da177e4
LT		 1275 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1276
46a243f7
ON		 1277 if (scsi_autopm_get_device(STp->device) < 0) {
1278 retval = -EIO;
1279 goto err_out;
1280 }
1281 resumed = 1;
1da177e4
LT		 1282 if (!scsi_block_when_processing_errors(STp->device)) {
1283 retval = (-ENXIO);
1284 goto err_out;
1285 }
1286
1287 /* See that we have at least a one page buffer available */
aaff5eba 1288 if (!enlarge_buffer(STp->buffer, PAGE_SIZE)) {
b30d8bca
HR		 1289 st_printk(KERN_WARNING, STp,
1290 "Can't allocate one page tape buffer.\n");
1da177e4
LT		 1291 retval = (-EOVERFLOW);
1292 goto err_out;
1293 }
1294
40f6b36c 1295 (STp->buffer)->cleared = 0;
1da177e4
LT		 1296 (STp->buffer)->writing = 0;
1297 (STp->buffer)->syscall_result = 0;
1298
1299 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1300
1301 STp->dirty = 0;
1302 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1303 STps = &(STp->ps[i]);
1304 STps->rw = ST_IDLE;
1305 }
9abe16c6 1306 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1307 STp->recover_count = 0;
1308 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1309 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1310
1311 retval = check_tape(STp, filp);
1312 if (retval < 0)
1313 goto err_out;
1314 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1315 retval != CHKRES_READY) {
413f7327
KM		 1316 if (STp->ready == NO_TAPE)
1317 retval = (-ENOMEDIUM);
1318 else
1319 retval = (-EIO);
1da177e4
LT		 1320 goto err_out;
1321 }
1322 return 0;
1323
1324 err_out:
1325 normalize_buffer(STp->buffer);
0644f539 1326 spin_lock(&st_use_lock);
1da177e4 1327 STp->in_use = 0;
0644f539 1328 spin_unlock(&st_use_lock);
46a243f7
ON		 1329 if (resumed)
1330 scsi_autopm_put_device(STp->device);
e7ac6c66 1331 scsi_tape_put(STp);
1da177e4
LT		 1332 return retval;
1333
1334}
1335\f
1336
1337/* Flush the tape buffer before close */
75e1fcc0 1338static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1339{
1340 int result = 0, result2;
1341 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1342 struct st_request *SRpnt;
1da177e4
LT		 1343 struct scsi_tape *STp = filp->private_data;
1344 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1345 struct st_partstat *STps = &(STp->ps[STp->partition]);
1da177e4
LT		 1346
1347 if (file_count(filp) > 1)
1348 return 0;
1349
1350 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1351 result = st_flush_write_buffer(STp);
1da177e4
LT		 1352 if (result != 0 && result != (-ENOSPC))
1353 goto out;
1354 }
1355
1356 if (STp->can_partitions &&
1357 (result2 = switch_partition(STp)) < 0) {
b30d8bca 1358 DEBC_printk(STp, "switch_partition at close failed.\n");
1da177e4
LT		 1359 if (result == 0)
1360 result = result2;
1361 goto out;
1362 }
1363
1364 DEBC( if (STp->nbr_requests)
b30d8bca
HR		 1365 st_printk(KERN_DEBUG, STp,
1366 "Number of r/w requests %d, dio used in %d, "
1367 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1368 STp->nbr_pages));
1da177e4
LT		 1369
1370 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1371 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1372
b30d8bca
HR		 1373#if DEBUG
1374 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1375 STp->nbr_waits, STp->nbr_finished);
1376#endif
1da177e4
LT		 1377 memset(cmd, 0, MAX_COMMAND_SIZE);
1378 cmd[0] = WRITE_FILEMARKS;
c743e44f
LD		 1379 if (STp->immediate_filemark)
1380 cmd[1] = 1;
1da177e4
LT		 1381 cmd[4] = 1 + STp->two_fm;
1382
02ae2c0e
KM		 1383 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1384 STp->device->request_queue->rq_timeout,
1385 MAX_WRITE_RETRIES, 1);
1da177e4 1386 if (!SRpnt) {
02ae2c0e 1387 result = (STp->buffer)->syscall_result;
1da177e4
LT		 1388 goto out;
1389 }
1390
1391 if (STp->buffer->syscall_result == 0 ||
1392 (cmdstatp->have_sense && !cmdstatp->deferred &&
1393 (cmdstatp->flags & SENSE_EOM) &&
1394 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1395 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1396 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1397 /* Write successful at EOM */
8b05b773 1398 st_release_request(SRpnt);
1da177e4
LT		 1399 SRpnt = NULL;
1400 if (STps->drv_file >= 0)
1401 STps->drv_file++;
1402 STps->drv_block = 0;
1403 if (STp->two_fm)
1404 cross_eof(STp, 0);
1405 STps->eof = ST_FM;
1406 }
1407 else { /* Write error */
8b05b773 1408 st_release_request(SRpnt);
1da177e4 1409 SRpnt = NULL;
b30d8bca
HR		 1410 st_printk(KERN_ERR, STp,
1411 "Error on write filemark.\n");
1da177e4
LT		 1412 if (result == 0)
1413 result = (-EIO);
1414 }
1415
b30d8bca 1416 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1da177e4
LT		 1417 } else if (!STp->rew_at_close) {
1418 STps = &(STp->ps[STp->partition]);
1419 if (!STm->sysv || STps->rw != ST_READING) {
1420 if (STp->can_bsr)
1421 result = flush_buffer(STp, 0);
1422 else if (STps->eof == ST_FM_HIT) {
1423 result = cross_eof(STp, 0);
1424 if (result) {
1425 if (STps->drv_file >= 0)
1426 STps->drv_file++;
1427 STps->drv_block = 0;
1428 STps->eof = ST_FM;
1429 } else
1430 STps->eof = ST_NOEOF;
1431 }
1432 } else if ((STps->eof == ST_NOEOF &&
1433 !(result = cross_eof(STp, 1))) ||
1434 STps->eof == ST_FM_HIT) {
1435 if (STps->drv_file >= 0)
1436 STps->drv_file++;
1437 STps->drv_block = 0;
1438 STps->eof = ST_FM;
1439 }
1440 }
1441
1442 out:
1443 if (STp->rew_at_close) {
1444 result2 = st_int_ioctl(STp, MTREW, 1);
1445 if (result == 0)
1446 result = result2;
1447 }
1448 return result;
1449}
1450
1451
1452/* Close the device and release it. BKL is not needed: this is the only thread
1453 accessing this tape. */
1454static int st_release(struct inode *inode, struct file *filp)
1455{
1da177e4
LT		 1456 struct scsi_tape *STp = filp->private_data;
1457
1458 if (STp->door_locked == ST_LOCKED_AUTO)
1459 do_door_lock(STp, 0);
1460
1461 normalize_buffer(STp->buffer);
6c648d95 1462 spin_lock(&st_use_lock);
1da177e4 1463 STp->in_use = 0;
6c648d95 1464 spin_unlock(&st_use_lock);
46a243f7 1465 scsi_autopm_put_device(STp->device);
f03a5670 1466 scsi_tape_put(STp);
1da177e4 1467
ec341439 1468 return 0;
1da177e4 1469}
ec341439 1470
1da177e4
LT		 1471/* The checks common to both reading and writing */
1472static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1473{
1474 ssize_t retval = 0;
1475
1476 /*
1477 * If we are in the middle of error recovery, don't let anyone
1478 * else try and use this device. Also, if error recovery fails, it
1479 * may try and take the device offline, in which case all further
1480 * access to the device is prohibited.
1481 */
1482 if (!scsi_block_when_processing_errors(STp->device)) {
1483 retval = (-ENXIO);
1484 goto out;
1485 }
1486
1487 if (STp->ready != ST_READY) {
1488 if (STp->ready == ST_NO_TAPE)
1489 retval = (-ENOMEDIUM);
1490 else
1491 retval = (-EIO);
1492 goto out;
1493 }
1494
1495 if (! STp->modes[STp->current_mode].defined) {
1496 retval = (-ENXIO);
1497 goto out;
1498 }
1499
1500
1501 /*
1502 * If there was a bus reset, block further access
1503 * to this device.
1504 */
1505 if (STp->pos_unknown) {
1506 retval = (-EIO);
1507 goto out;
1508 }
1509
1510 if (count == 0)
1511 goto out;
1512
b30d8bca 1513 DEB(
1da177e4 1514 if (!STp->in_use) {
b30d8bca
HR		 1515 st_printk(ST_DEB_MSG, STp,
1516 "Incorrect device.\n");
1da177e4
LT		 1517 retval = (-EIO);
1518 goto out;
1519 } ) /* end DEB */
1520
1521 if (STp->can_partitions &&
1522 (retval = switch_partition(STp)) < 0)
1523 goto out;
1524
1525 if (STp->block_size == 0 && STp->max_block > 0 &&
1526 (count < STp->min_block || count > STp->max_block)) {
1527 retval = (-EINVAL);
1528 goto out;
1529 }
1530
1531 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1532 !do_door_lock(STp, 1))
1533 STp->door_locked = ST_LOCKED_AUTO;
1534
1535 out:
1536 return retval;
1537}
1538
1539
1540static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1541 size_t count, int is_read)
1542{
1543 int i, bufsize, retval = 0;
1544 struct st_buffer *STbp = STp->buffer;
1545
1546 if (is_read)
9abe16c6 1547 i = STp->try_dio_now && try_rdio;
1da177e4 1548 else
9abe16c6 1549 i = STp->try_dio_now && try_wdio;
8b05b773 1550
1da177e4
LT		 1551 if (i && ((unsigned long)buf & queue_dma_alignment(
1552 STp->device->request_queue)) == 0) {
6620742f
FT		 1553 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1554 count, (is_read ? READ : WRITE));
1da177e4
LT		 1555 if (i > 0) {
1556 STbp->do_dio = i;
1557 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1558 }
1559 else
1560 STbp->do_dio = 0; /* fall back to buffering with any error */
1561 STbp->sg_segs = STbp->do_dio;
1da177e4
LT		 1562 DEB(
1563 if (STbp->do_dio) {
1564 STp->nbr_dio++;
1565 STp->nbr_pages += STbp->do_dio;
1da177e4
LT		 1566 }
1567 )
1568 } else
1569 STbp->do_dio = 0;
1570 DEB( STp->nbr_requests++; )
1571
1572 if (!STbp->do_dio) {
1573 if (STp->block_size)
1574 bufsize = STp->block_size > st_fixed_buffer_size ?
1575 STp->block_size : st_fixed_buffer_size;
40f6b36c 1576 else {
1da177e4 1577 bufsize = count;
40f6b36c
KM		 1578 /* Make sure that data from previous user is not leaked even if
1579 HBA does not return correct residual */
1580 if (is_read && STp->sili && !STbp->cleared)
1581 clear_buffer(STbp);
1582 }
1583
1da177e4 1584 if (bufsize > STbp->buffer_size &&
aaff5eba 1585 !enlarge_buffer(STbp, bufsize)) {
b30d8bca
HR		 1586 st_printk(KERN_WARNING, STp,
1587 "Can't allocate %d byte tape buffer.\n",
1588 bufsize);
1da177e4
LT		 1589 retval = (-EOVERFLOW);
1590 goto out;
1591 }
1592 if (STp->block_size)
1593 STbp->buffer_blocks = bufsize / STp->block_size;
1594 }
1595
1596 out:
1597 return retval;
1598}
1599
1600
1601/* Can be called more than once after each setup_buffer() */
787926b1 1602static void release_buffering(struct scsi_tape *STp, int is_read)
1da177e4
LT		 1603{
1604 struct st_buffer *STbp;
1605
1606 STbp = STp->buffer;
1607 if (STbp->do_dio) {
6620742f 1608 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1da177e4 1609 STbp->do_dio = 0;
787926b1 1610 STbp->sg_segs = 0;
1da177e4
LT		 1611 }
1612}
1613
1614
1615/* Write command */
1616static ssize_t
1617st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1618{
1619 ssize_t total;
1620 ssize_t i, do_count, blks, transfer;
1621 ssize_t retval;
1622 int undone, retry_eot = 0, scode;
1623 int async_write;
1624 unsigned char cmd[MAX_COMMAND_SIZE];
1625 const char __user *b_point;
8b05b773 1626 struct st_request *SRpnt = NULL;
1da177e4
LT		 1627 struct scsi_tape *STp = filp->private_data;
1628 struct st_modedef *STm;
1629 struct st_partstat *STps;
1630 struct st_buffer *STbp;
1da177e4 1631
28f85009 1632 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 1633 return -ERESTARTSYS;
1634
1635 retval = rw_checks(STp, filp, count);
1636 if (retval || count == 0)
1637 goto out;
1638
1639 /* Write must be integral number of blocks */
1640 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
b30d8bca
HR		 1641 st_printk(KERN_WARNING, STp,
1642 "Write not multiple of tape block size.\n");
1da177e4
LT		 1643 retval = (-EINVAL);
1644 goto out;
1645 }
1646
1647 STm = &(STp->modes[STp->current_mode]);
1648 STps = &(STp->ps[STp->partition]);
1649
1650 if (STp->write_prot) {
1651 retval = (-EACCES);
1652 goto out;
1653 }
1654
1655
1656 if (STps->rw == ST_READING) {
1657 retval = flush_buffer(STp, 0);
1658 if (retval)
1659 goto out;
1660 STps->rw = ST_WRITING;
1661 } else if (STps->rw != ST_WRITING &&
1662 STps->drv_file == 0 && STps->drv_block == 0) {
1663 if ((retval = set_mode_densblk(STp, STm)) < 0)
1664 goto out;
1665 if (STm->default_compression != ST_DONT_TOUCH &&
1666 !(STp->compression_changed)) {
1667 if (st_compression(STp, (STm->default_compression == ST_YES))) {
b30d8bca
HR		 1668 st_printk(KERN_WARNING, STp,
1669 "Can't set default compression.\n");
1da177e4
LT		 1670 if (modes_defined) {
1671 retval = (-EINVAL);
1672 goto out;
1673 }
1674 }
1675 }
1676 }
1677
1678 STbp = STp->buffer;
1679 i = write_behind_check(STp);
1680 if (i) {
1681 if (i == -ENOSPC)
1682 STps->eof = ST_EOM_OK;
1683 else
1684 STps->eof = ST_EOM_ERROR;
1685 }
1686
1687 if (STps->eof == ST_EOM_OK) {
1688 STps->eof = ST_EOD_1; /* allow next write */
1689 retval = (-ENOSPC);
1690 goto out;
1691 }
1692 else if (STps->eof == ST_EOM_ERROR) {
1693 retval = (-EIO);
1694 goto out;
1695 }
1696
1697 /* Check the buffer readability in cases where copy_user might catch
1698 the problems after some tape movement. */
1699 if (STp->block_size != 0 &&
1700 !STbp->do_dio &&
1701 (copy_from_user(&i, buf, 1) != 0 ||
1702 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1703 retval = (-EFAULT);
1704 goto out;
1705 }
1706
1707 retval = setup_buffering(STp, buf, count, 0);
1708 if (retval)
1709 goto out;
1710
1711 total = count;
1712
1713 memset(cmd, 0, MAX_COMMAND_SIZE);
1714 cmd[0] = WRITE_6;
1715 cmd[1] = (STp->block_size != 0);
1716
1717 STps->rw = ST_WRITING;
1718
1719 b_point = buf;
1720 while (count > 0 && !retry_eot) {
1721
1722 if (STbp->do_dio) {
1723 do_count = count;
1724 }
1725 else {
1726 if (STp->block_size == 0)
1727 do_count = count;
1728 else {
1729 do_count = STbp->buffer_blocks * STp->block_size -
1730 STbp->buffer_bytes;
1731 if (do_count > count)
1732 do_count = count;
1733 }
1734
1735 i = append_to_buffer(b_point, STbp, do_count);
1736 if (i) {
1737 retval = i;
1738 goto out;
1739 }
1740 }
1741 count -= do_count;
1742 b_point += do_count;
1743
1744 async_write = STp->block_size == 0 && !STbp->do_dio &&
1745 STm->do_async_writes && STps->eof < ST_EOM_OK;
1746
1747 if (STp->block_size != 0 && STm->do_buffer_writes &&
9abe16c6 1748 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1da177e4
LT		 1749 STbp->buffer_bytes < STbp->buffer_size) {
1750 STp->dirty = 1;
1751 /* Don't write a buffer that is not full enough. */
1752 if (!async_write && count == 0)
1753 break;
1754 }
1755
1756 retry_write:
1757 if (STp->block_size == 0)
1758 blks = transfer = do_count;
1759 else {
1760 if (!STbp->do_dio)
1761 blks = STbp->buffer_bytes;
1762 else
1763 blks = do_count;
1764 blks /= STp->block_size;
1765 transfer = blks * STp->block_size;
1766 }
1767 cmd[2] = blks >> 16;
1768 cmd[3] = blks >> 8;
1769 cmd[4] = blks;
1770
1771 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 1772 STp->device->request_queue->rq_timeout,
1773 MAX_WRITE_RETRIES, !async_write);
1da177e4
LT		 1774 if (!SRpnt) {
1775 retval = STbp->syscall_result;
1776 goto out;
1777 }
8b05b773 1778 if (async_write && !STbp->syscall_result) {
1da177e4
LT		 1779 STbp->writing = transfer;
1780 STp->dirty = !(STbp->writing ==
1781 STbp->buffer_bytes);
1782 SRpnt = NULL; /* Prevent releasing this request! */
1783 DEB( STp->write_pending = 1; )
1784 break;
1785 }
1786
1787 if (STbp->syscall_result != 0) {
1788 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1789
b30d8bca 1790 DEBC_printk(STp, "Error on write:\n");
1da177e4
LT		 1791 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1792 scode = cmdstatp->sense_hdr.sense_key;
1793 if (cmdstatp->remainder_valid)
1794 undone = (int)cmdstatp->uremainder64;
1795 else if (STp->block_size == 0 &&
1796 scode == VOLUME_OVERFLOW)
1797 undone = transfer;
1798 else
1799 undone = 0;
1800 if (STp->block_size != 0)
1801 undone *= STp->block_size;
1802 if (undone <= do_count) {
1803 /* Only data from this write is not written */
1804 count += undone;
626dcb1e 1805 b_point -= undone;
1da177e4
LT		 1806 do_count -= undone;
1807 if (STp->block_size)
1808 blks = (transfer - undone) / STp->block_size;
1809 STps->eof = ST_EOM_OK;
1810 /* Continue in fixed block mode if all written
1811 in this request but still something left to write
1812 (retval left to zero)
1813 */
1814 if (STp->block_size == 0 ||
1815 undone > 0 || count == 0)
1816 retval = (-ENOSPC); /* EOM within current request */
b30d8bca
HR		 1817 DEBC_printk(STp, "EOM with %d "
1818 "bytes unwritten.\n",
1819 (int)count);
1da177e4
LT		 1820 } else {
1821 /* EOT within data buffered earlier (possible only
1822 in fixed block mode without direct i/o) */
1823 if (!retry_eot && !cmdstatp->deferred &&
1824 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1825 move_buffer_data(STp->buffer, transfer - undone);
1826 retry_eot = 1;
1827 if (STps->drv_block >= 0) {
1828 STps->drv_block += (transfer - undone) /
1829 STp->block_size;
1830 }
1831 STps->eof = ST_EOM_OK;
b30d8bca
HR		 1832 DEBC_printk(STp, "Retry "
1833 "write of %d "
1834 "bytes at EOM.\n",
1835 STp->buffer->buffer_bytes);
1da177e4
LT		 1836 goto retry_write;
1837 }
1838 else {
1839 /* Either error within data buffered by driver or
1840 failed retry */
1841 count -= do_count;
1842 blks = do_count = 0;
1843 STps->eof = ST_EOM_ERROR;
1844 STps->drv_block = (-1); /* Too cautious? */
1845 retval = (-EIO); /* EOM for old data */
b30d8bca
HR		 1846 DEBC_printk(STp, "EOM with "
1847 "lost data.\n");
1da177e4
LT		 1848 }
1849 }
1850 } else {
1851 count += do_count;
1852 STps->drv_block = (-1); /* Too cautious? */
8b05b773 1853 retval = STbp->syscall_result;
1da177e4
LT		 1854 }
1855
1856 }
1857
1858 if (STps->drv_block >= 0) {
1859 if (STp->block_size == 0)
1860 STps->drv_block += (do_count > 0);
1861 else
1862 STps->drv_block += blks;
1863 }
1864
1865 STbp->buffer_bytes = 0;
1866 STp->dirty = 0;
1867
1868 if (retval || retry_eot) {
1869 if (count < total)
1870 retval = total - count;
1871 goto out;
1872 }
1873 }
1874
1875 if (STps->eof == ST_EOD_1)
1876 STps->eof = ST_EOM_OK;
1877 else if (STps->eof != ST_EOM_OK)
1878 STps->eof = ST_NOEOF;
1879 retval = total - count;
1880
1881 out:
1882 if (SRpnt != NULL)
8b05b773 1883 st_release_request(SRpnt);
787926b1 1884 release_buffering(STp, 0);
28f85009 1885 mutex_unlock(&STp->lock);
1da177e4
LT		 1886
1887 return retval;
1888}
1889\f
1890/* Read data from the tape. Returns zero in the normal case, one if the
1891 eof status has changed, and the negative error code in case of a
1892 fatal error. Otherwise updates the buffer and the eof state.
1893
1894 Does release user buffer mapping if it is set.
1895*/
1896static long read_tape(struct scsi_tape *STp, long count,
8b05b773 1897 struct st_request ** aSRpnt)
1da177e4
LT		 1898{
1899 int transfer, blks, bytes;
1900 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1901 struct st_request *SRpnt;
1da177e4
LT		 1902 struct st_modedef *STm;
1903 struct st_partstat *STps;
1904 struct st_buffer *STbp;
1905 int retval = 0;
1da177e4
LT		 1906
1907 if (count == 0)
1908 return 0;
1909
1910 STm = &(STp->modes[STp->current_mode]);
1911 STps = &(STp->ps[STp->partition]);
1912 if (STps->eof == ST_FM_HIT)
1913 return 1;
1914 STbp = STp->buffer;
1915
1916 if (STp->block_size == 0)
1917 blks = bytes = count;
1918 else {
9abe16c6 1919 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1da177e4
LT		 1920 blks = (STp->buffer)->buffer_blocks;
1921 bytes = blks * STp->block_size;
1922 } else {
1923 bytes = count;
1924 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1925 bytes = (STp->buffer)->buffer_size;
1926 blks = bytes / STp->block_size;
1927 bytes = blks * STp->block_size;
1928 }
1929 }
1930
1931 memset(cmd, 0, MAX_COMMAND_SIZE);
1932 cmd[0] = READ_6;
1933 cmd[1] = (STp->block_size != 0);
40f6b36c
KM		 1934 if (!cmd[1] && STp->sili)
1935 cmd[1] |= 2;
1da177e4
LT		 1936 cmd[2] = blks >> 16;
1937 cmd[3] = blks >> 8;
1938 cmd[4] = blks;
1939
1940 SRpnt = *aSRpnt;
1941 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
a02488ed
JB		 1942 STp->device->request_queue->rq_timeout,
1943 MAX_RETRIES, 1);
787926b1 1944 release_buffering(STp, 1);
1da177e4
LT		 1945 *aSRpnt = SRpnt;
1946 if (!SRpnt)
1947 return STbp->syscall_result;
1948
1949 STbp->read_pointer = 0;
1950 STps->at_sm = 0;
1951
1952 /* Something to check */
1953 if (STbp->syscall_result) {
1954 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1955
1956 retval = 1;
b30d8bca
HR		 1957 DEBC_printk(STp,
1958 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1959 SRpnt->sense[0], SRpnt->sense[1],
1960 SRpnt->sense[2], SRpnt->sense[3],
1961 SRpnt->sense[4], SRpnt->sense[5],
1962 SRpnt->sense[6], SRpnt->sense[7]);
1da177e4
LT		 1963 if (cmdstatp->have_sense) {
1964
1965 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1966 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1967
1968 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1969 /* Compute the residual count */
1970 if (cmdstatp->remainder_valid)
1971 transfer = (int)cmdstatp->uremainder64;
1972 else
1973 transfer = 0;
5e4fabb6
KM		 1974 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1975 if (STp->block_size == 0)
1976 transfer = bytes;
1977 /* Some drives set ILI with MEDIUM ERROR */
1978 cmdstatp->flags &= ~SENSE_ILI;
1979 }
1da177e4
LT		 1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
b30d8bca
HR		 1982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
1da177e4
LT		 1995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
8b05b773 1997 st_release_request(SRpnt);
1da177e4
LT		 1998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
b30d8bca
HR		 2000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
1da177e4
LT		 2003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
b30d8bca
HR		 2011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
1da177e4
LT		 2016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
b30d8bca
HR		 2031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
1da177e4
LT		 2034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
b30d8bca
HR		 2045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
1da177e4
LT		 2048 }
2049 }
b30d8bca 2050 /* end of EOF, EOM, ILI test */
1da177e4 2051 else { /* nonzero sense key */
b30d8bca 2052 DEBC_printk(STp, "Tape error while reading.\n");
1da177e4
LT		 2053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
b30d8bca
HR		 2056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
1da177e4
LT		 2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
b30d8bca 2067 /* End of extended sense test */
1da177e4
LT		 2068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
b30d8bca 2073 /* End of error handling */
40f6b36c 2074 else { /* Read successful */
1da177e4 2075 STbp->buffer_bytes = bytes;
40f6b36c
KM		 2076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
1da177e4
LT		 2079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087}
2088\f
2089
2090/* Read command */
2091static ssize_t
2092st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093{
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
8b05b773 2098 struct st_request *SRpnt = NULL;
1da177e4
LT		 2099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
1da177e4 2103
28f85009 2104 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
b30d8bca 2127 DEB(
1da177e4 2128 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
1da177e4
LT		 2133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
b30d8bca 2179 DEB(
1da177e4 2180 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
1da177e4
LT		 2186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
8b05b773 2225 st_release_request(SRpnt);
1da177e4
LT		 2226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
787926b1 2229 release_buffering(STp, 1);
1da177e4
LT		 2230 STbp->buffer_bytes = 0;
2231 }
28f85009 2232 mutex_unlock(&STp->lock);
1da177e4
LT		 2233
2234 return retval;
2235}
2236\f
2237
2238
2239DEB(
2240/* Set the driver options */
b30d8bca 2241static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
1da177e4
LT		 2242{
2243 if (debugging) {
b30d8bca
HR		 2244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
1da177e4
LT		 2265 }
2266}
2267 )
2268
2269
2270static int st_set_options(struct scsi_tape *STp, long options)
2271{
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
1da177e4 2275 struct cdev *cd0, *cd1;
d6216c47 2276 struct device *d0, *d1;
1da177e4
LT		 2277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
d6216c47
ML		 2280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
1da177e4 2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
d6216c47
ML		 2285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
1da177e4 2289 modes_defined = 1;
b30d8bca
HR		 2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
1da177e4
LT		 2292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
c743e44f 2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
1da177e4 2310 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2311 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4 2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
b30d8bca 2313 st_log_options(STp, STm); )
1da177e4
LT		 2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
c743e44f
LD		 2341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
1da177e4
LT		 2343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
40f6b36c
KM		 2345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
b30d8bca 2347 DEB(
1da177e4
LT		 2348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
b30d8bca 2350 st_log_options(STp, STm); )
1da177e4
LT		 2351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
b30d8bca 2357 DEBC_printk(STp, "Default block size disabled.\n");
1da177e4
LT		 2358 } else {
2359 STm->default_blksize = value;
b30d8bca
HR		 2360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
1da177e4
LT		 2362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
b30d8bca
HR		 2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
1da177e4 2373 } else {
a02488ed
JB		 2374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
b30d8bca
HR		 2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
1da177e4
LT		 2378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
832151f4
RK		 2382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
1da177e4
LT		 2384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
b30d8bca
HR		 2388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
1da177e4
LT		 2391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
b30d8bca
HR		 2397 DEBC_printk(STp,
2398 "Density default disabled.\n");
1da177e4
LT		 2399 } else {
2400 STm->default_density = value & 0xff;
b30d8bca
HR		 2401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
1da177e4
LT		 2403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
b30d8bca
HR		 2411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
1da177e4
LT		 2413 } else {
2414 STp->default_drvbuffer = value & 7;
b30d8bca
HR		 2415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
1da177e4
LT		 2418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
b30d8bca
HR		 2424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
1da177e4
LT		 2426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
b30d8bca
HR		 2429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
1da177e4
LT		 2432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
b30d8bca
HR		 2435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
1da177e4
LT		 2438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449}
2450\f
2451#define MODE_HEADER_LENGTH 4
2452
2453/* Mode header and page byte offsets */
2454#define MH_OFF_DATA_LENGTH 0
2455#define MH_OFF_MEDIUM_TYPE 1
2456#define MH_OFF_DEV_SPECIFIC 2
2457#define MH_OFF_BDESCS_LENGTH 3
2458#define MP_OFF_PAGE_NBR 0
2459#define MP_OFF_PAGE_LENGTH 1
2460
2461/* Mode header and page bit masks */
2462#define MH_BIT_WP 0x80
2463#define MP_MSK_PAGE_NBR 0x3f
2464
2465/* Don't return block descriptors */
2466#define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468#define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470/* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474{
2475 unsigned char cmd[MAX_COMMAND_SIZE];
8ecf0d99 2476 struct st_request *SRpnt;
1da177e4
LT		 2477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
02ae2c0e
KM		 2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
1da177e4 2489
8b05b773 2490 st_release_request(SRpnt);
1da177e4 2491
02ae2c0e 2492 return STp->buffer->syscall_result;
1da177e4
LT		 2493}
2494
2495
2496/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499{
02ae2c0e 2500 int pgo;
1da177e4 2501 unsigned char cmd[MAX_COMMAND_SIZE];
18c87015 2502 struct st_request *SRpnt;
02ae2c0e 2503 int timeout;
1da177e4
LT		 2504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
02ae2c0e
KM		 2517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
1da177e4 2523
8b05b773 2524 st_release_request(SRpnt);
1da177e4 2525
02ae2c0e 2526 return STp->buffer->syscall_result;
1da177e4
LT		 2527}
2528
2529
2530#define COMPRESSION_PAGE 0x0f
2531#define COMPRESSION_PAGE_LENGTH 16
2532
2533#define CP_OFF_DCE_DCC 2
2534#define CP_OFF_C_ALGO 7
2535
2536#define DCE_MASK 0x80
2537#define DCC_MASK 0x40
2538#define RED_MASK 0x60
2539
2540
2541/* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <[email protected]>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547static int st_compression(struct scsi_tape * STp, int state)
2548{
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
1da177e4
LT		 2552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
b30d8bca 2559 DEBC_printk(STp, "Compression mode page not supported.\n");
1da177e4
LT		 2560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 2564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
1da177e4
LT		 2566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
b30d8bca 2569 DEBC_printk(STp, "Compression not supported.\n");
1da177e4
LT		 2570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
b30d8bca 2587 DEBC_printk(STp, "Compression change failed.\n");
1da177e4
LT		 2588 return (-EIO);
2589 }
b30d8bca 2590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
1da177e4
LT		 2591
2592 STp->compression_changed = 1;
2593 return 0;
2594}
2595
2596
2597/* Process the load and unload commands (does unload if the load code is zero) */
2598static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599{
2600 int retval = (-EIO), timeout;
1da177e4
LT		 2601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
8b05b773 2603 struct st_request *SRpnt;
1da177e4
LT		 2604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
b30d8bca
HR		 2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
1da177e4
LT		 2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2628 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
b30d8bca 2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
1da177e4 2636 else
b30d8bca 2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
1da177e4
LT		 2638 );
2639
02ae2c0e
KM		 2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
1da177e4 2642 if (!SRpnt)
02ae2c0e 2643 return (STp->buffer)->syscall_result;
1da177e4
LT		 2644
2645 retval = (STp->buffer)->syscall_result;
02ae2c0e 2646 st_release_request(SRpnt);
1da177e4
LT		 2647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667}
2668\f
2669#if DEBUG
2670#define ST_DEB_FORWARD 0
2671#define ST_DEB_BACKWARD 1
b30d8bca 2672static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
1da177e4
LT		 2673{
2674 s32 sc;
2675
b30d8bca
HR		 2676 if (!debugging)
2677 return;
2678
35b703db 2679 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
1da177e4
LT		 2680 if (direction)
2681 sc = -sc;
b30d8bca
HR		 2682 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2683 direction ? "backward" : "forward", sc, units);
1da177e4 2684}
b30d8bca
HR		 2685#else
2686#define ST_DEB_FORWARD 0
2687#define ST_DEB_BACKWARD 1
2688static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2689#endif
2690
2691
2692/* Internal ioctl function */
2693static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2694{
2695 int timeout;
2696 long ltmp;
2697 int ioctl_result;
2698 int chg_eof = 1;
2699 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2700 struct st_request *SRpnt;
1da177e4
LT		 2701 struct st_partstat *STps;
2702 int fileno, blkno, at_sm, undone;
2703 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2704
2705 WARN_ON(STp->buffer->do_dio != 0);
2706 if (STp->ready != ST_READY) {
2707 if (STp->ready == ST_NO_TAPE)
2708 return (-ENOMEDIUM);
2709 else
2710 return (-EIO);
2711 }
2712 timeout = STp->long_timeout;
2713 STps = &(STp->ps[STp->partition]);
2714 fileno = STps->drv_file;
2715 blkno = STps->drv_block;
2716 at_sm = STps->at_sm;
2717
2718 memset(cmd, 0, MAX_COMMAND_SIZE);
2719 switch (cmd_in) {
2720 case MTFSFM:
2721 chg_eof = 0; /* Changed from the FSF after this */
df561f66 2722 fallthrough;
1da177e4
LT		 2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
b30d8bca 2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
df561f66 2737 fallthrough;
1da177e4
LT		 2738 case MTBSF:
2739 cmd[0] = SPACE;
2740 cmd[1] = 0x01; /* Space FileMarks */
2741 ltmp = (-arg);
2742 cmd[2] = (ltmp >> 16);
2743 cmd[3] = (ltmp >> 8);
2744 cmd[4] = ltmp;
b30d8bca 2745 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2746 if (fileno >= 0)
2747 fileno -= arg;
2748 blkno = (-1); /* We can't know the block number */
2749 at_sm &= (arg == 0);
2750 break;
2751 case MTFSR:
2752 cmd[0] = SPACE;
2753 cmd[1] = 0x00; /* Space Blocks */
2754 cmd[2] = (arg >> 16);
2755 cmd[3] = (arg >> 8);
2756 cmd[4] = arg;
b30d8bca 2757 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2758 if (blkno >= 0)
2759 blkno += arg;
2760 at_sm &= (arg == 0);
2761 break;
2762 case MTBSR:
2763 cmd[0] = SPACE;
2764 cmd[1] = 0x00; /* Space Blocks */
2765 ltmp = (-arg);
2766 cmd[2] = (ltmp >> 16);
2767 cmd[3] = (ltmp >> 8);
2768 cmd[4] = ltmp;
b30d8bca 2769 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2770 if (blkno >= 0)
2771 blkno -= arg;
2772 at_sm &= (arg == 0);
2773 break;
2774 case MTFSS:
2775 cmd[0] = SPACE;
2776 cmd[1] = 0x04; /* Space Setmarks */
2777 cmd[2] = (arg >> 16);
2778 cmd[3] = (arg >> 8);
2779 cmd[4] = arg;
b30d8bca 2780 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2781 if (arg != 0) {
2782 blkno = fileno = (-1);
2783 at_sm = 1;
2784 }
2785 break;
2786 case MTBSS:
2787 cmd[0] = SPACE;
2788 cmd[1] = 0x04; /* Space Setmarks */
2789 ltmp = (-arg);
2790 cmd[2] = (ltmp >> 16);
2791 cmd[3] = (ltmp >> 8);
2792 cmd[4] = ltmp;
b30d8bca 2793 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2794 if (arg != 0) {
2795 blkno = fileno = (-1);
2796 at_sm = 1;
2797 }
2798 break;
2799 case MTWEOF:
3e51d3c9 2800 case MTWEOFI:
1da177e4
LT		 2801 case MTWSM:
2802 if (STp->write_prot)
2803 return (-EACCES);
2804 cmd[0] = WRITE_FILEMARKS;
2805 if (cmd_in == MTWSM)
2806 cmd[1] = 2;
c743e44f
LD		 2807 if (cmd_in == MTWEOFI ||
2808 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2809 cmd[1] |= 1;
1da177e4
LT		 2810 cmd[2] = (arg >> 16);
2811 cmd[3] = (arg >> 8);
2812 cmd[4] = arg;
a02488ed 2813 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2814 DEBC(
2815 if (cmd_in != MTWSM)
2816 st_printk(ST_DEB_MSG, STp,
2817 "Writing %d filemarks.\n",
2818 cmd[2] * 65536 +
2819 cmd[3] * 256 +
2820 cmd[4]);
2821 else
2822 st_printk(ST_DEB_MSG, STp,
2823 "Writing %d setmarks.\n",
2824 cmd[2] * 65536 +
2825 cmd[3] * 256 +
2826 cmd[4]);
1da177e4
LT		 2827 )
2828 if (fileno >= 0)
2829 fileno += arg;
2830 blkno = 0;
2831 at_sm = (cmd_in == MTWSM);
2832 break;
2833 case MTREW:
2834 cmd[0] = REZERO_UNIT;
2835 if (STp->immediate) {
2836 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2837 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2838 }
b30d8bca 2839 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2840 fileno = blkno = at_sm = 0;
2841 break;
2842 case MTNOP:
b30d8bca 2843 DEBC_printk(STp, "No op on tape.\n");
1da177e4 2844 return 0; /* Should do something ? */
1da177e4
LT		 2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2849 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2850 }
2851 cmd[4] = 3;
b30d8bca 2852 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
b30d8bca 2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2881 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
b30d8bca 2886 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2933 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2934 DEBC(
1da177e4 2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
1da177e4 2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
1da177e4 2945 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
02ae2c0e
KM		 2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
02ae2c0e 2960 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2961
2962 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2963 st_release_request(SRpnt);
1da177e4
LT		 2964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
1da177e4
LT		 2977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
3e51d3c9
KM		 2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 2997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
3e51d3c9 3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3014 cmdstatp->have_sense &&
91614c05
KM		 3015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
1da177e4 3026 STps->drv_file = fileno;
1da177e4
LT		 3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
1da2019f 3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3078 st_release_request(SRpnt);
1da177e4
LT		 3079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
8b05b773 3088 st_release_request(SRpnt);
1da177e4
LT		 3089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093}
3094\f
3095
3096/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101{
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3104 struct st_request *SRpnt;
1da177e4
LT		 3105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
02ae2c0e
KM		 3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
1da177e4 3121 if (!SRpnt)
02ae2c0e 3122 return (STp->buffer)->syscall_result;
1da177e4
LT		 3123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
b30d8bca 3128 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
b30d8bca
HR		 3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
1da177e4 3149 }
8b05b773 3150 st_release_request(SRpnt);
1da177e4
LT		 3151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161{
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3167 struct st_request *SRpnt;
1da177e4
LT		 3168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
b30d8bca
HR		 3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
1da177e4
LT		 3176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
b30d8bca
HR		 3189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
1da177e4
LT		 3192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
b30d8bca
HR		 3213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
1da177e4
LT		 3216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3220 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3221 }
3222
02ae2c0e
KM		 3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
1da177e4 3225 if (!SRpnt)
02ae2c0e 3226 return (STp->buffer)->syscall_result;
1da177e4
LT		 3227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
02ae2c0e 3251
8b05b773 3252 st_release_request(SRpnt);
1da177e4
LT		 3253 SRpnt = NULL;
3254
3255 return result;
3256}
3257
3258
3259/* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261static int find_partition(struct scsi_tape *STp)
3262{
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271}
3272
3273
3274/* Change the partition if necessary */
3275static int switch_partition(struct scsi_tape *STp)
3276{
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285}
3286\f
3287/* Functions for reading and writing the medium partition mode page. */
3288
3289#define PART_PAGE 0x11
3290#define PART_PAGE_FIXED_LENGTH 8
3291
3292#define PP_OFF_MAX_ADD_PARTS 2
3293#define PP_OFF_NBR_ADD_PARTS 3
3294#define PP_OFF_FLAGS 4
3295#define PP_OFF_PART_UNITS 6
3296#define PP_OFF_RESERVED 7
3297
3298#define PP_BIT_IDP 0x20
8038e645 3299#define PP_BIT_FDP 0x80
1da177e4 3300#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3301#define PP_MSK_PSUM_UNITS 0x18
3302#define PP_MSK_POFM 0x04
1da177e4
LT		 3303
3304/* Get the number of partitions on the tape. As a side effect reads the
3305 mode page into the tape buffer. */
3306static int nbr_partitions(struct scsi_tape *STp)
3307{
3308 int result;
1da177e4
LT		 3309
3310 if (STp->ready != ST_READY)
3311 return (-EIO);
3312
3313 result = read_mode_page(STp, PART_PAGE, 1);
3314
3315 if (result) {
b30d8bca 3316 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3317 result = (-EIO);
3318 } else {
3319 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3320 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3321 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3322 }
3323
3324 return result;
3325}
3326
3327
8038e645
KM		 3328static int format_medium(struct scsi_tape *STp, int format)
3329{
3330 int result = 0;
3331 int timeout = STp->long_timeout;
3332 unsigned char scmd[MAX_COMMAND_SIZE];
3333 struct st_request *SRpnt;
3334
3335 memset(scmd, 0, MAX_COMMAND_SIZE);
3336 scmd[0] = FORMAT_UNIT;
3337 scmd[2] = format;
3338 if (STp->immediate) {
3339 scmd[1] |= 1; /* Don't wait for completion */
3340 timeout = STp->device->request_queue->rq_timeout;
3341 }
3342 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3343 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3344 timeout, MAX_RETRIES, 1);
3345 if (!SRpnt)
3346 result = STp->buffer->syscall_result;
3347 return result;
3348}
3349
3350
1da177e4
LT		 3351/* Partition the tape into two partitions if size > 0 or one partition if
3352 size == 0.
3353
3354 The block descriptors are read and written because Sony SDT-7000 does not
3355 work without this (suggestion from Michael Schaefer <[email protected]>).
3356
3357 My HP C1533A drive returns only one partition size field. This is used to
3358 set the size of partition 1. There is no size field for the default partition.
3359 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3360 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3361 The following algorithm is used to accommodate both drives: if the number of
3362 partition size fields is greater than the maximum number of additional partitions
3363 in the mode page, the second field is used. Otherwise the first field is used.
3364
3365 For Seagate DDS drives the page length must be 8 when no partitions is defined
3366 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3367 is acceptable also to some other old drives and enforced if the first partition
3368 size field is used for the first additional partition size.
8038e645
KM		 3369
3370 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3371 */
3372static int partition_tape(struct scsi_tape *STp, int size)
3373{
1da177e4 3374 int result;
8038e645
KM		 3375 int target_partition;
3376 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3377 int pgo, psd_cnt, psdo;
8038e645 3378 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3379 unsigned char *bp;
3380
3381 result = read_mode_page(STp, PART_PAGE, 0);
3382 if (result) {
b30d8bca 3383 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3384 return result;
3385 }
8038e645
KM		 3386 target_partition = 1;
3387 if (size < 0) {
3388 target_partition = 0;
3389 size = -size;
3390 }
3391
1da177e4
LT		 3392 /* The mode page is in the buffer. Let's modify it and write it. */
3393 bp = (STp->buffer)->b_data;
3394 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3395 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3396 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3397
3398 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3399
3400 if (scsi3) {
3401 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3402 if (needs_format && size == 0) {
3403 /* No need to write the mode page when clearing
3404 * partitioning
3405 */
3406 DEBC_printk(STp, "Formatting tape with one partition.\n");
3407 result = format_medium(STp, 0);
3408 goto out;
3409 }
3410 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3411 psd_cnt = 2;
3412 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3413 /* Use units scaling for large partitions if the device
3414 * suggests it and no precision lost. Required for IBM
3415 * TS1140/50 drives that don't support MB units.
3416 */
3417 if (size >= 1000 && (size % 1000) == 0) {
3418 size /= 1000;
3419 psum = PP_MSK_PSUM_UNITS;
3420 units = 9; /* GB */
3421 }
3422 }
3423 /* Try it anyway if too large to specify in MB */
3424 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3425 size /= 1000;
3426 psum = PP_MSK_PSUM_UNITS;
3427 units = 9; /* GB */
3428 }
3429 }
3430
3431 if (size >= 65535 || /* Does not fit into two bytes */
3432 (target_partition == 0 && psd_cnt < 2)) {
3433 result = -EINVAL;
3434 goto out;
3435 }
3436
1da177e4 3437 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3438 /* The second condition is for HP DDS which use only one partition size
3439 * descriptor
3440 */
3441 if (target_partition > 0 &&
3442 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3443 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3444 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3445 psdo += 2;
3446 }
3447 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3448
b30d8bca 3449 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3450 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3451 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3452
8038e645 3453 if (size == 0) {
1da177e4
LT		 3454 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3455 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3456 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3457 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3458 } else {
3459 bp[psdo] = (size >> 8) & 0xff;
3460 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3461 if (target_partition == 0)
3462 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3463 bp[pgo + 3] = 1;
3464 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3465 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3466 DEBC_printk(STp,
3467 "Formatting tape with two partitions (%i = %d MB).\n",
3468 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3469 }
3470 bp[pgo + PP_OFF_PART_UNITS] = 0;
3471 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3472 if (size != 1 || units != 0) {
3473 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3474 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3475 bp[pgo + PP_OFF_PART_UNITS] = units;
3476 } else
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3479 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3480
3481 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3482
3483 if (!result && needs_format)
3484 result = format_medium(STp, 1);
3485
1da177e4 3486 if (result) {
b30d8bca 3487 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3488 result = (-EIO);
3489 }
3490
8038e645 3491out:
1da177e4
LT		 3492 return result;
3493}
3494\f
3495
3496
3497/* The ioctl command */
dba7688f 3498static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4 3499{
dba7688f 3500 void __user *p = (void __user *)arg;
1da177e4
LT		 3501 int i, cmd_nr, cmd_type, bt;
3502 int retval = 0;
3503 unsigned int blk;
3504 struct scsi_tape *STp = file->private_data;
3505 struct st_modedef *STm;
3506 struct st_partstat *STps;
1da177e4 3507
28f85009 3508 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3509 return -ERESTARTSYS;
3510
b30d8bca 3511 DEB(
1da177e4 3512 if (debugging && !STp->in_use) {
b30d8bca 3513 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3514 retval = (-EIO);
3515 goto out;
3516 } ) /* end DEB */
3517
3518 STm = &(STp->modes[STp->current_mode]);
3519 STps = &(STp->ps[STp->partition]);
3520
3521 /*
3522 * If we are in the middle of error recovery, don't let anyone
3523 * else try and use this device. Also, if error recovery fails, it
3524 * may try and take the device offline, in which case all further
3525 * access to the device is prohibited.
3526 */
906d15fb
CH		 3527 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3528 file->f_flags & O_NDELAY);
3529 if (retval)
1da177e4 3530 goto out;
1da177e4
LT		 3531
3532 cmd_type = _IOC_TYPE(cmd_in);
3533 cmd_nr = _IOC_NR(cmd_in);
3534
3535 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3536 struct mtop mtc;
3537
3538 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3539 retval = (-EINVAL);
3540 goto out;
3541 }
3542
3543 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3544 if (i) {
3545 retval = (-EFAULT);
3546 goto out;
3547 }
3548
3549 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3550 st_printk(KERN_WARNING, STp,
3551 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3552 retval = (-EPERM);
3553 goto out;
3554 }
3555 if (!STm->defined &&
3556 (mtc.mt_op != MTSETDRVBUFFER &&
3557 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3558 retval = (-ENXIO);
3559 goto out;
3560 }
3561
3562 if (!STp->pos_unknown) {
3563
3564 if (STps->eof == ST_FM_HIT) {
3565 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3566 mtc.mt_op == MTEOM) {
3567 mtc.mt_count -= 1;
3568 if (STps->drv_file >= 0)
3569 STps->drv_file += 1;
3570 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3571 mtc.mt_count += 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 }
3575 }
3576
3577 if (mtc.mt_op == MTSEEK) {
3578 /* Old position must be restored if partition will be
3579 changed */
3580 i = !STp->can_partitions ||
3581 (STp->new_partition != STp->partition);
3582 } else {
3583 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3584 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3585 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3586 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3587 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3588 mtc.mt_op == MTCOMPRESSION;
3589 }
3590 i = flush_buffer(STp, i);
3591 if (i < 0) {
3592 retval = i;
3593 goto out;
3594 }
3595 if (STps->rw == ST_WRITING &&
3596 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3597 mtc.mt_op == MTSEEK ||
3598 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3599 i = st_int_ioctl(STp, MTWEOF, 1);
3600 if (i < 0) {
3601 retval = i;
3602 goto out;
3603 }
3604 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3605 mtc.mt_count++;
3606 STps->rw = ST_IDLE;
3607 }
3608
3609 } else {
3610 /*
3611 * If there was a bus reset, block further access
3612 * to this device. If the user wants to rewind the tape,
3613 * then reset the flag and allow access again.
3614 */
3615 if (mtc.mt_op != MTREW &&
3616 mtc.mt_op != MTOFFL &&
3617 mtc.mt_op != MTRETEN &&
3618 mtc.mt_op != MTERASE &&
3619 mtc.mt_op != MTSEEK &&
3620 mtc.mt_op != MTEOM) {
3621 retval = (-EIO);
3622 goto out;
3623 }
3624 reset_state(STp);
3625 /* remove this when the midlevel properly clears was_reset */
3626 STp->device->was_reset = 0;
3627 }
3628
3629 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3630 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3631 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3632 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3633
3634 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3635 do_door_lock(STp, 0); /* Ignore result! */
3636
3637 if (mtc.mt_op == MTSETDRVBUFFER &&
3638 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3639 retval = st_set_options(STp, mtc.mt_count);
3640 goto out;
3641 }
3642
3643 if (mtc.mt_op == MTSETPART) {
3644 if (!STp->can_partitions ||
3645 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3646 retval = (-EINVAL);
3647 goto out;
3648 }
3649 if (mtc.mt_count >= STp->nbr_partitions &&
3650 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3651 retval = (-EIO);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions) {
3655 retval = (-EINVAL);
3656 goto out;
3657 }
3658 STp->new_partition = mtc.mt_count;
3659 retval = 0;
3660 goto out;
3661 }
3662
3663 if (mtc.mt_op == MTMKPART) {
3664 if (!STp->can_partitions) {
3665 retval = (-EINVAL);
3666 goto out;
3667 }
8038e645
KM		 3668 i = do_load_unload(STp, file, 1);
3669 if (i < 0) {
3670 retval = i;
3671 goto out;
3672 }
3673 i = partition_tape(STp, mtc.mt_count);
3674 if (i < 0) {
1da177e4
LT		 3675 retval = i;
3676 goto out;
3677 }
3678 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3679 STp->ps[i].rw = ST_IDLE;
3680 STp->ps[i].at_sm = 0;
3681 STp->ps[i].last_block_valid = 0;
3682 }
3683 STp->partition = STp->new_partition = 0;
8038e645 3684 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3685 STps->drv_block = STps->drv_file = 0;
3686 retval = 0;
3687 goto out;
3688 }
3689
3690 if (mtc.mt_op == MTSEEK) {
3691 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3692 if (!STp->can_partitions)
3693 STp->ps[0].rw = ST_IDLE;
3694 retval = i;
3695 goto out;
3696 }
3697
3698 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3699 retval = do_load_unload(STp, file, 0);
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTLOAD) {
3704 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3709 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3710 goto out;
3711 }
3712
3713 if (STp->can_partitions && STp->ready == ST_READY &&
3714 (i = switch_partition(STp)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718
3719 if (mtc.mt_op == MTCOMPRESSION)
3720 retval = st_compression(STp, (mtc.mt_count & 1));
3721 else
3722 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3723 goto out;
3724 }
3725 if (!STm->defined) {
3726 retval = (-ENXIO);
3727 goto out;
3728 }
3729
3730 if ((i = flush_buffer(STp, 0)) < 0) {
3731 retval = i;
3732 goto out;
3733 }
3734 if (STp->can_partitions &&
3735 (i = switch_partition(STp)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739
3740 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3741 struct mtget mt_status;
3742
3743 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3744 retval = (-EINVAL);
3745 goto out;
3746 }
3747
3748 mt_status.mt_type = STp->tape_type;
3749 mt_status.mt_dsreg =
3750 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3751 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3752 mt_status.mt_blkno = STps->drv_block;
3753 mt_status.mt_fileno = STps->drv_file;
3754 if (STp->block_size != 0) {
3755 if (STps->rw == ST_WRITING)
3756 mt_status.mt_blkno +=
3757 (STp->buffer)->buffer_bytes / STp->block_size;
3758 else if (STps->rw == ST_READING)
3759 mt_status.mt_blkno -=
3760 ((STp->buffer)->buffer_bytes +
3761 STp->block_size - 1) / STp->block_size;
3762 }
3763
3764 mt_status.mt_gstat = 0;
3765 if (STp->drv_write_prot)
3766 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3767 if (mt_status.mt_blkno == 0) {
3768 if (mt_status.mt_fileno == 0)
3769 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3770 else
3771 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3772 }
3773 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3774 mt_status.mt_resid = STp->partition;
3775 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3776 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3777 else if (STps->eof >= ST_EOM_OK)
3778 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3779 if (STp->density == 1)
3780 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3781 else if (STp->density == 2)
3782 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3783 else if (STp->density == 3)
3784 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3785 if (STp->ready == ST_READY)
3786 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3787 if (STp->ready == ST_NO_TAPE)
3788 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3789 if (STps->at_sm)
3790 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3791 if (STm->do_async_writes ||
3792 (STm->do_buffer_writes && STp->block_size != 0) ||
3793 STp->drv_buffer != 0)
3794 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3795 if (STp->cleaning_req)
3796 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3797
1207045d
AB		 3798 retval = put_user_mtget(p, &mt_status);
3799 if (retval)
1da177e4 3800 goto out;
1da177e4
LT		 3801
3802 STp->recover_reg = 0; /* Clear after read */
1da177e4
LT		 3803 goto out;
3804 } /* End of MTIOCGET */
3805 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3806 struct mtpos mt_pos;
3807 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3808 retval = (-EINVAL);
3809 goto out;
3810 }
3811 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3812 retval = i;
3813 goto out;
3814 }
3815 mt_pos.mt_blkno = blk;
1207045d 3816 retval = put_user_mtpos(p, &mt_pos);
1da177e4
LT		 3817 goto out;
3818 }
28f85009 3819 mutex_unlock(&STp->lock);
d320a955 3820
1da177e4 3821 switch (cmd_in) {
dba7688f
CH		 3822 case SG_IO:
3823 case SCSI_IOCTL_SEND_COMMAND:
3824 case CDROM_SEND_PACKET:
3825 if (!capable(CAP_SYS_RAWIO))
3826 return -EPERM;
6a2ea0d3 3827 break;
dba7688f 3828 default:
dba7688f
CH		 3829 break;
3830 }
d320a955 3831
a30e3441 3832 retval = scsi_ioctl(STp->device, file->f_mode, cmd_in, p);
dba7688f
CH		 3833 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
3834 /* unload */
3835 STp->rew_at_close = 0;
3836 STp->ready = ST_NO_TAPE;
1da177e4 3837 }
dba7688f 3838 return retval;
1da177e4
LT		 3839
3840 out:
28f85009 3841 mutex_unlock(&STp->lock);
1da177e4
LT		 3842 return retval;
3843}
3844
3845#ifdef CONFIG_COMPAT
1207045d 3846static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4 3847{
1207045d
AB		 3848 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3849 switch (cmd_in) {
1207045d 3850 case MTIOCPOS32:
dba7688f
CH		 3851 cmd_in = MTIOCPOS;
3852 break;
1207045d 3853 case MTIOCGET32:
dba7688f
CH		 3854 cmd_in = MTIOCGET;
3855 break;
1207045d
AB		 3856 }
3857
dba7688f 3858 return st_ioctl(file, cmd_in, arg);
1da177e4
LT		 3859}
3860#endif
3861
3862\f
3863
3864/* Try to allocate a new tape buffer. Calling function must not hold
3865 dev_arr_lock. */
aaff5eba 3866static struct st_buffer *new_tape_buffer(int max_sg)
1da177e4 3867{
1da177e4
LT		 3868 struct st_buffer *tb;
3869
4011f076 3870 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
1da177e4
LT		 3871 if (!tb) {
3872 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3873 return NULL;
3874 }
1ac63cf5 3875 tb->frp_segs = 0;
1da177e4 3876 tb->use_sg = max_sg;
f409d6cc 3877 tb->buffer_size = 0;
1da177e4 3878
6396bb22 3879 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
4011f076 3880 GFP_KERNEL);
d0e1ae31
FT		 3881 if (!tb->reserved_pages) {
3882 kfree(tb);
3883 return NULL;
3884 }
3885
1da177e4
LT		 3886 return tb;
3887}
3888
3889
3890/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3891#define ST_MAX_ORDER 6
3892
aaff5eba 3893static int enlarge_buffer(struct st_buffer * STbuffer, int new_size)
1da177e4 3894{
769989a4 3895 int segs, max_segs, b_size, order, got;
c53033f6 3896 gfp_t priority;
1da177e4
LT		 3897
3898 if (new_size <= STbuffer->buffer_size)
3899 return 1;
3900
3901 if (STbuffer->buffer_size <= PAGE_SIZE)
3902 normalize_buffer(STbuffer); /* Avoid extra segment */
3903
3904 max_segs = STbuffer->use_sg;
1da177e4
LT		 3905
3906 priority = GFP_KERNEL | __GFP_NOWARN;
9c905966 3907
08c95832
FT		 3908 if (STbuffer->cleared)
3909 priority |= __GFP_ZERO;
3910
9c905966 3911 if (STbuffer->frp_segs) {
c982c368 3912 order = STbuffer->reserved_page_order;
08c95832 3913 b_size = PAGE_SIZE << order;
9c905966
FT		 3914 } else {
3915 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3916 order < ST_MAX_ORDER &&
3917 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3918 order++, b_size *= 2)
9c905966 3919 ; /* empty */
373daacf 3920 STbuffer->reserved_page_order = order;
9c905966 3921 }
8f78fc5e
KM		 3922 if (max_segs * (PAGE_SIZE << order) < new_size) {
3923 if (order == ST_MAX_ORDER)
3924 return 0;
3925 normalize_buffer(STbuffer);
aaff5eba 3926 return enlarge_buffer(STbuffer, new_size);
8f78fc5e 3927 }
1da177e4
LT		 3928
3929 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3930 segs < max_segs && got < new_size;) {
08c95832
FT		 3931 struct page *page;
3932
3933 page = alloc_pages(priority, order);
3934 if (!page) {
1da177e4
LT		 3935 DEB(STbuffer->buffer_size = got);
3936 normalize_buffer(STbuffer);
3937 return 0;
3938 }
08c95832 3939
1da177e4
LT		 3940 STbuffer->frp_segs += 1;
3941 got += b_size;
3942 STbuffer->buffer_size = got;
08c95832 3943 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3944 segs++;
3945 }
08c95832 3946 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3947
3948 return 1;
3949}
3950
3951
40f6b36c
KM		 3952/* Make sure that no data from previous user is in the internal buffer */
3953static void clear_buffer(struct st_buffer * st_bp)
3954{
3955 int i;
3956
3957 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3958 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3959 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3960 st_bp->cleared = 1;
3961}
3962
3963
1da177e4
LT		 3964/* Release the extra buffer */
3965static void normalize_buffer(struct st_buffer * STbuffer)
3966{
c982c368 3967 int i, order = STbuffer->reserved_page_order;
1da177e4 3968
1ac63cf5 3969 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3970 __free_pages(STbuffer->reserved_pages[i], order);
3971 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3972 }
1ac63cf5 3973 STbuffer->frp_segs = 0;
8b05b773 3974 STbuffer->sg_segs = 0;
c982c368 3975 STbuffer->reserved_page_order = 0;
d0e1ae31 3976 STbuffer->map_data.offset = 0;
1da177e4
LT		 3977}
3978
3979
3980/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3981 negative error code. */
3982static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3983{
3984 int i, cnt, res, offset;
c982c368 3985 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 3986
3987 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 3988 i < st_bp->frp_segs && offset >= length; i++)
3989 offset -= length;
1da177e4
LT		 3990 if (i == st_bp->frp_segs) { /* Should never happen */
3991 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3992 return (-EIO);
3993 }
3994 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 3995 struct page *page = st_bp->reserved_pages[i];
3996 cnt = length - offset < do_count ? length - offset : do_count;
3997 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 3998 if (res)
3999 return (-EFAULT);
4000 do_count -= cnt;
4001 st_bp->buffer_bytes += cnt;
4002 ubp += cnt;
4003 offset = 0;
4004 }
4005 if (do_count) /* Should never happen */
4006 return (-EIO);
4007
4008 return 0;
4009}
4010
4011
4012/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4013 negative error code. */
4014static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4015{
4016 int i, cnt, res, offset;
c982c368 4017 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4018
4019 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4020 i < st_bp->frp_segs && offset >= length; i++)
4021 offset -= length;
1da177e4
LT		 4022 if (i == st_bp->frp_segs) { /* Should never happen */
4023 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4024 return (-EIO);
4025 }
4026 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4027 struct page *page = st_bp->reserved_pages[i];
4028 cnt = length - offset < do_count ? length - offset : do_count;
4029 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4030 if (res)
4031 return (-EFAULT);
4032 do_count -= cnt;
4033 st_bp->buffer_bytes -= cnt;
4034 st_bp->read_pointer += cnt;
4035 ubp += cnt;
4036 offset = 0;
4037 }
4038 if (do_count) /* Should never happen */
4039 return (-EIO);
4040
4041 return 0;
4042}
4043
4044
4045/* Move data towards start of buffer */
4046static void move_buffer_data(struct st_buffer * st_bp, int offset)
4047{
4048 int src_seg, dst_seg, src_offset = 0, dst_offset;
4049 int count, total;
c982c368 4050 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4051
4052 if (offset == 0)
4053 return;
4054
4055 total=st_bp->buffer_bytes - offset;
4056 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4057 src_offset = offset;
08c95832 4058 if (src_offset < length)
1da177e4 4059 break;
08c95832 4060 offset -= length;
1da177e4
LT		 4061 }
4062
4063 st_bp->buffer_bytes = st_bp->read_pointer = total;
4064 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4065 struct page *dpage = st_bp->reserved_pages[dst_seg];
4066 struct page *spage = st_bp->reserved_pages[src_seg];
4067
4068 count = min(length - dst_offset, length - src_offset);
4069 memmove(page_address(dpage) + dst_offset,
4070 page_address(spage) + src_offset, count);
1da177e4 4071 src_offset += count;
08c95832 4072 if (src_offset >= length) {
1da177e4
LT		 4073 src_seg++;
4074 src_offset = 0;
4075 }
4076 dst_offset += count;
08c95832 4077 if (dst_offset >= length) {
1da177e4
LT		 4078 dst_seg++;
4079 dst_offset = 0;
4080 }
4081 total -= count;
4082 }
4083}
4084
1da177e4
LT		 4085/* Validate the options from command line or module parameters */
4086static void validate_options(void)
4087{
4088 if (buffer_kbs > 0)
4089 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4090 if (max_sg_segs >= ST_FIRST_SG)
4091 st_max_sg_segs = max_sg_segs;
4092}
4093
4094#ifndef MODULE
4095/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4096 */
4097static int __init st_setup(char *str)
4098{
4099 int i, len, ints[5];
4100 char *stp;
4101
4102 stp = get_options(str, ARRAY_SIZE(ints), ints);
4103
4104 if (ints[0] > 0) {
4105 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4106 if (parms[i].val)
4107 *parms[i].val = ints[i + 1];
4108 } else {
4109 while (stp != NULL) {
4110 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4111 len = strlen(parms[i].name);
4112 if (!strncmp(stp, parms[i].name, len) &&
4113 (*(stp + len) == ':' || *(stp + len) == '=')) {
4114 if (parms[i].val)
4115 *parms[i].val =
4116 simple_strtoul(stp + len + 1, NULL, 0);
4117 else
4118 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4119 parms[i].name);
4120 break;
4121 }
4122 }
6391a113 4123 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4124 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4125 stp);
4126 stp = strchr(stp, ',');
4127 if (stp)
4128 stp++;
4129 }
4130 }
4131
4132 validate_options();
4133
4134 return 1;
4135}
4136
4137__setup("st=", st_setup);
4138
4139#endif
4140
00977a59 4141static const struct file_operations st_fops =
1da177e4
LT		 4142{
4143 .owner = THIS_MODULE,
4144 .read = st_read,
4145 .write = st_write,
fd66c1b4 4146 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4147#ifdef CONFIG_COMPAT
4148 .compat_ioctl = st_compat_ioctl,
4149#endif
4150 .open = st_open,
4151 .flush = st_flush,
4152 .release = st_release,
b4d878e2 4153 .llseek = noop_llseek,
1da177e4
LT		 4154};
4155
26898afd
JM		 4156static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4157{
4158 int i, error;
4159 dev_t cdev_devno;
4160 struct cdev *cdev;
4161 struct device *dev;
4162 struct st_modedef *STm = &(tape->modes[mode]);
4163 char name[10];
4164 int dev_num = tape->index;
4165
4166 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4167
4168 cdev = cdev_alloc();
4169 if (!cdev) {
4170 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4171 error = -ENOMEM;
4172 goto out;
4173 }
4174 cdev->owner = THIS_MODULE;
4175 cdev->ops = &st_fops;
ab08ee14 4176 STm->cdevs[rew] = cdev;
26898afd
JM		 4177
4178 error = cdev_add(cdev, cdev_devno, 1);
4179 if (error) {
4180 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4181 rew ? "non" : "auto", mode);
4182 pr_err("st%d: Device not attached.\n", dev_num);
4183 goto out_free;
4184 }
26898afd
JM		 4185
4186 i = mode << (4 - ST_NBR_MODE_BITS);
4187 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
45938335 4188 tape->name, st_formats[i]);
26898afd
JM		 4189
4190 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4191 cdev_devno, &tape->modes[mode], "%s", name);
4192 if (IS_ERR(dev)) {
4193 pr_err("st%d: device_create failed\n", dev_num);
4194 error = PTR_ERR(dev);
4195 goto out_free;
4196 }
4197
4198 STm->devs[rew] = dev;
4199
4200 return 0;
4201out_free:
4202 cdev_del(STm->cdevs[rew]);
26898afd 4203out:
ab08ee14
ML		 4204 STm->cdevs[rew] = NULL;
4205 STm->devs[rew] = NULL;
26898afd
JM		 4206 return error;
4207}
4208
4209static int create_cdevs(struct scsi_tape *tape)
4210{
4211 int mode, error;
4212 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4213 error = create_one_cdev(tape, mode, 0);
4214 if (error)
4215 return error;
4216 error = create_one_cdev(tape, mode, 1);
4217 if (error)
4218 return error;
4219 }
4220
4221 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4222 &tape->modes[0].devs[0]->kobj, "tape");
4223}
4224
4225static void remove_cdevs(struct scsi_tape *tape)
4226{
4227 int mode, rew;
4228 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4229 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4230 struct st_modedef *STm = &(tape->modes[mode]);
4231 for (rew = 0; rew < 2; rew++) {
4232 if (STm->cdevs[rew])
4233 cdev_del(STm->cdevs[rew]);
4234 if (STm->devs[rew])
4235 device_unregister(STm->devs[rew]);
4236 }
4237 }
4238}
4239
1da177e4
LT		 4240static int st_probe(struct device *dev)
4241{
4242 struct scsi_device *SDp = to_scsi_device(dev);
1da177e4
LT		 4243 struct scsi_tape *tpnt = NULL;
4244 struct st_modedef *STm;
4245 struct st_partstat *STps;
4246 struct st_buffer *buffer;
b98c52b5 4247 int i, error;
1da177e4 4248 char *stp;
1da177e4
LT		 4249
4250 if (SDp->type != TYPE_TAPE)
4251 return -ENODEV;
4252 if ((stp = st_incompatible(SDp))) {
b30d8bca 4253 sdev_printk(KERN_INFO, SDp,
4e3ea141
HR		 4254 "OnStream tapes are no longer supported;\n");
4255 sdev_printk(KERN_INFO, SDp,
4256 "please mail to [email protected].\n");
1da177e4
LT		 4257 return -ENODEV;
4258 }
4259
6fe8c1db 4260 scsi_autopm_get_device(SDp);
8a78362c 4261 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4262 if (st_max_sg_segs < i)
4263 i = st_max_sg_segs;
aaff5eba 4264 buffer = new_tape_buffer(i);
1da177e4 4265 if (buffer == NULL) {
b30d8bca
HR		 4266 sdev_printk(KERN_ERR, SDp,
4267 "st: Can't allocate new tape buffer. "
4268 "Device not attached.\n");
1da177e4
LT		 4269 goto out;
4270 }
4271
1f618aac 4272 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
1da177e4 4273 if (tpnt == NULL) {
b30d8bca
HR		 4274 sdev_printk(KERN_ERR, SDp,
4275 "st: Can't allocate device descriptor.\n");
45938335 4276 goto out_buffer_free;
1da177e4 4277 }
f03a5670 4278 kref_init(&tpnt->kref);
1da177e4 4279 tpnt->driver = &st_template;
1da177e4
LT		 4280
4281 tpnt->device = SDp;
4282 if (SDp->scsi_level <= 2)
4283 tpnt->tape_type = MT_ISSCSI1;
4284 else
4285 tpnt->tape_type = MT_ISSCSI2;
4286
4287 tpnt->buffer = buffer;
f03a5670 4288 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4289
4290 tpnt->inited = 0;
4291 tpnt->dirty = 0;
4292 tpnt->in_use = 0;
4293 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
1da177e4
LT		 4294 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4295 tpnt->density = 0;
4296 tpnt->do_auto_lock = ST_AUTO_LOCK;
4297 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4298 tpnt->can_partitions = 0;
4299 tpnt->two_fm = ST_TWO_FM;
4300 tpnt->fast_mteom = ST_FAST_MTEOM;
4301 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4302 tpnt->sili = ST_SILI;
1da177e4 4303 tpnt->immediate = ST_NOWAIT;
c743e44f 4304 tpnt->immediate_filemark = 0;
1da177e4
LT		 4305 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4306 tpnt->partition = 0;
4307 tpnt->new_partition = 0;
4308 tpnt->nbr_partitions = 0;
a02488ed 4309 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4 4310 tpnt->long_timeout = ST_LONG_TIMEOUT;
aaff5eba 4311 tpnt->try_dio = try_direct_io;
1da177e4 4312
1da177e4
LT		 4313 for (i = 0; i < ST_NBR_MODES; i++) {
4314 STm = &(tpnt->modes[i]);
4315 STm->defined = 0;
4316 STm->sysv = ST_SYSV;
4317 STm->defaults_for_writes = 0;
4318 STm->do_async_writes = ST_ASYNC_WRITES;
4319 STm->do_buffer_writes = ST_BUFFER_WRITES;
4320 STm->do_read_ahead = ST_READ_AHEAD;
4321 STm->default_compression = ST_DONT_TOUCH;
4322 STm->default_blksize = (-1); /* No forced size */
4323 STm->default_density = (-1); /* No forced density */
6c648d95 4324 STm->tape = tpnt;
1da177e4
LT		 4325 }
4326
4327 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4328 STps = &(tpnt->ps[i]);
4329 STps->rw = ST_IDLE;
4330 STps->eof = ST_NOEOF;
4331 STps->at_sm = 0;
4332 STps->last_block_valid = 0;
4333 STps->drv_block = (-1);
4334 STps->drv_file = (-1);
4335 }
4336
4337 tpnt->current_mode = 0;
4338 tpnt->modes[0].defined = 1;
4339
4340 tpnt->density_changed = tpnt->compression_changed =
4341 tpnt->blksize_changed = 0;
28f85009 4342 mutex_init(&tpnt->lock);
1da177e4 4343
b98c52b5 4344 idr_preload(GFP_KERNEL);
6c648d95 4345 spin_lock(&st_index_lock);
b98c52b5 4346 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4347 spin_unlock(&st_index_lock);
b98c52b5
TH		 4348 idr_preload_end();
4349 if (error < 0) {
6c648d95 4350 pr_warn("st: idr allocation failed: %d\n", error);
45938335 4351 goto out_free_tape;
6c648d95 4352 }
b98c52b5 4353 tpnt->index = error;
45938335 4354 sprintf(tpnt->name, "st%d", tpnt->index);
05545c92
SS		 4355 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4356 if (tpnt->stats == NULL) {
4357 sdev_printk(KERN_ERR, SDp,
4358 "st: Can't allocate statistics.\n");
4359 goto out_idr_remove;
4360 }
6c648d95
JM		 4361
4362 dev_set_drvdata(dev, tpnt);
1da177e4 4363
1da177e4 4364
26898afd
JM		 4365 error = create_cdevs(tpnt);
4366 if (error)
4367 goto out_remove_devs;
46a243f7 4368 scsi_autopm_put_device(SDp);
1da177e4 4369
42252854 4370 sdev_printk(KERN_NOTICE, SDp,
45938335 4371 "Attached scsi tape %s\n", tpnt->name);
42252854 4372 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
45938335 4373 tpnt->name, tpnt->try_dio ? "yes" : "no",
42252854 4374 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4375
4376 return 0;
4377
26898afd
JM		 4378out_remove_devs:
4379 remove_cdevs(tpnt);
05545c92
SS		 4380 kfree(tpnt->stats);
4381out_idr_remove:
6c648d95 4382 spin_lock(&st_index_lock);
b98c52b5 4383 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4384 spin_unlock(&st_index_lock);
45938335 4385out_free_tape:
c9475cb0 4386 kfree(tpnt);
1da177e4
LT		 4387out_buffer_free:
4388 kfree(buffer);
4389out:
6fe8c1db 4390 scsi_autopm_put_device(SDp);
1da177e4
LT		 4391 return -ENODEV;
4392};
4393
4394
4395static int st_remove(struct device *dev)
4396{
6c648d95 4397 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4398 int index = tpnt->index;
4399
4400 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4401 remove_cdevs(tpnt);
1da177e4 4402
6c648d95
JM		 4403 mutex_lock(&st_ref_mutex);
4404 kref_put(&tpnt->kref, scsi_tape_release);
4405 mutex_unlock(&st_ref_mutex);
4406 spin_lock(&st_index_lock);
4407 idr_remove(&st_index_idr, index);
4408 spin_unlock(&st_index_lock);
1da177e4
LT		 4409 return 0;
4410}
4411
f03a5670
KM		 4412/**
4413 * scsi_tape_release - Called to free the Scsi_Tape structure
4414 * @kref: pointer to embedded kref
4415 *
0b950672 4416 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4417 * called on last put, you should always use the scsi_tape_get()
4418 * scsi_tape_put() helpers which manipulate the semaphore directly
4419 * and never do a direct kref_put().
4420 **/
4421static void scsi_tape_release(struct kref *kref)
4422{
4423 struct scsi_tape *tpnt = to_scsi_tape(kref);
f03a5670
KM		 4424
4425 tpnt->device = NULL;
4426
4427 if (tpnt->buffer) {
f03a5670 4428 normalize_buffer(tpnt->buffer);
d0e1ae31 4429 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4430 kfree(tpnt->buffer);
4431 }
4432
05545c92 4433 kfree(tpnt->stats);
f03a5670
KM		 4434 kfree(tpnt);
4435 return;
4436}
4437
af23782b
JM		 4438static struct class st_sysfs_class = {
4439 .name = "scsi_tape",
c69c6be5 4440 .dev_groups = st_dev_groups,
af23782b
JM		 4441};
4442
1da177e4
LT		 4443static int __init init_st(void)
4444{
13026a6b
JG		 4445 int err;
4446
1da177e4
LT		 4447 validate_options();
4448
13026a6b 4449 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4450 verstr, st_fixed_buffer_size, st_max_sg_segs);
4451
2bec708a
LO		 4452 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4453 if (debugging) {
4454 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4455 debugging);
4456 }
4457
af23782b
JM		 4458 err = class_register(&st_sysfs_class);
4459 if (err) {
4460 pr_err("Unable register sysfs class for SCSI tapes\n");
4461 return err;
1da177e4
LT		 4462 }
4463
13026a6b
JG		 4464 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4465 ST_MAX_TAPE_ENTRIES, "st");
4466 if (err) {
4467 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4468 SCSI_TAPE_MAJOR);
4469 goto err_class;
1da177e4
LT		 4470 }
4471
13026a6b
JG		 4472 err = scsi_register_driver(&st_template.gendrv);
4473 if (err)
4474 goto err_chrdev;
4475
13026a6b
JG		 4476 return 0;
4477
13026a6b
JG		 4478err_chrdev:
4479 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4480 ST_MAX_TAPE_ENTRIES);
4481err_class:
af23782b 4482 class_unregister(&st_sysfs_class);
13026a6b 4483 return err;
1da177e4
LT		 4484}
4485
4486static void __exit exit_st(void)
4487{
1da177e4
LT		 4488 scsi_unregister_driver(&st_template.gendrv);
4489 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4490 ST_MAX_TAPE_ENTRIES);
af23782b 4491 class_unregister(&st_sysfs_class);
2d3a5d21 4492 idr_destroy(&st_index_idr);
1da177e4
LT		 4493 printk(KERN_INFO "st: Unloaded.\n");
4494}
4495
4496module_init(init_st);
4497module_exit(exit_st);
4498
4499
4500/* The sysfs driver interface. Read-only at the moment */
10978e48 4501static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4502{
10978e48 4503 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4504}
10978e48 4505static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4506
10978e48 4507static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4508{
10978e48 4509 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4510}
10978e48 4511static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4512
10978e48 4513static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4514{
10978e48 4515 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4516}
10978e48 4517static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4518
10978e48 4519static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4520{
10978e48 4521 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4522}
10978e48 4523static DRIVER_ATTR_RO(version);
1da177e4 4524
d9b43a10
SS		 4525#if DEBUG
4526static ssize_t debug_flag_store(struct device_driver *ddp,
4527 const char *buf, size_t count)
4528{
4529/* We only care what the first byte of the data is the rest is unused.
4530 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4531 * other values have -EINVAL returned if they are passed in.
4532 */
4533 if (count > 0) {
4534 if (buf[0] == '0') {
4535 debugging = NO_DEBUG;
4536 return count;
4537 } else if (buf[0] == '1') {
4538 debugging = 1;
4539 return count;
4540 }
4541 }
4542 return -EINVAL;
4543}
4544
4545static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4546{
4547 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4548}
4549static DRIVER_ATTR_RW(debug_flag);
4550#endif
4551
442d7562
SS		 4552static struct attribute *st_drv_attrs[] = {
4553 &driver_attr_try_direct_io.attr,
4554 &driver_attr_fixed_buffer_size.attr,
4555 &driver_attr_max_sg_segs.attr,
4556 &driver_attr_version.attr,
d9b43a10
SS		 4557#if DEBUG
4558 &driver_attr_debug_flag.attr,
4559#endif
442d7562
SS		 4560 NULL,
4561};
4562ATTRIBUTE_GROUPS(st_drv);
1da177e4 4563
1da177e4 4564/* The sysfs simple class interface */
ee959b00 4565static ssize_t
af23782b 4566defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4567{
7d15d6a4 4568 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4569 ssize_t l = 0;
4570
4571 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4572 return l;
4573}
c69c6be5 4574static DEVICE_ATTR_RO(defined);
1da177e4 4575
ee959b00 4576static ssize_t
af23782b
JM		 4577default_blksize_show(struct device *dev, struct device_attribute *attr,
4578 char *buf)
1da177e4 4579{
7d15d6a4 4580 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4581 ssize_t l = 0;
4582
4583 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4584 return l;
4585}
c69c6be5 4586static DEVICE_ATTR_RO(default_blksize);
1da177e4 4587
ee959b00 4588static ssize_t
af23782b
JM		 4589default_density_show(struct device *dev, struct device_attribute *attr,
4590 char *buf)
1da177e4 4591{
7d15d6a4 4592 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4593 ssize_t l = 0;
4594 char *fmt;
4595
4596 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4597 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4598 return l;
4599}
c69c6be5 4600static DEVICE_ATTR_RO(default_density);
1da177e4 4601
ee959b00 4602static ssize_t
af23782b
JM		 4603default_compression_show(struct device *dev, struct device_attribute *attr,
4604 char *buf)
1da177e4 4605{
7d15d6a4 4606 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4607 ssize_t l = 0;
4608
4609 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4610 return l;
4611}
c69c6be5 4612static DEVICE_ATTR_RO(default_compression);
1da177e4 4613
ee959b00 4614static ssize_t
af23782b 4615options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4616{
7d15d6a4 4617 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4618 struct scsi_tape *STp = STm->tape;
4619 int options;
b174be02
KM		 4620 ssize_t l = 0;
4621
b174be02
KM		 4622 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4623 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4624 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4625 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4626 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4627 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4628 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4629 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4630 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4631 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4632 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4633 options |= STm->sysv ? MT_ST_SYSV : 0;
4634 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4635 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4636 options |= STp->sili ? MT_ST_SILI : 0;
4637
4638 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4639 return l;
4640}
c69c6be5
GKH		 4641static DEVICE_ATTR_RO(options);
4642
05545c92
SS		 4643/* Support for tape stats */
4644
4645/**
4646 * read_cnt_show - return read count - count of reads made from tape drive
4647 * @dev: struct device
4648 * @attr: attribute structure
4649 * @buf: buffer to return formatted data in
4650 */
4651static ssize_t read_cnt_show(struct device *dev,
4652 struct device_attribute *attr, char *buf)
4653{
4654 struct st_modedef *STm = dev_get_drvdata(dev);
4655
4656 return sprintf(buf, "%lld",
4657 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4658}
4659static DEVICE_ATTR_RO(read_cnt);
4660
4661/**
4662 * read_byte_cnt_show - return read byte count - tape drives
4663 * may use blocks less than 512 bytes this gives the raw byte count of
4664 * of data read from the tape drive.
4665 * @dev: struct device
4666 * @attr: attribute structure
4667 * @buf: buffer to return formatted data in
4668 */
4669static ssize_t read_byte_cnt_show(struct device *dev,
4670 struct device_attribute *attr, char *buf)
4671{
4672 struct st_modedef *STm = dev_get_drvdata(dev);
4673
4674 return sprintf(buf, "%lld",
4675 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4676}
4677static DEVICE_ATTR_RO(read_byte_cnt);
4678
4679/**
e2dca2a2 4680 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
05545c92
SS		 4681 * @dev: struct device
4682 * @attr: attribute structure
4683 * @buf: buffer to return formatted data in
4684 */
4685static ssize_t read_ns_show(struct device *dev,
4686 struct device_attribute *attr, char *buf)
4687{
4688 struct st_modedef *STm = dev_get_drvdata(dev);
4689
4690 return sprintf(buf, "%lld",
4691 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4692}
4693static DEVICE_ATTR_RO(read_ns);
4694
4695/**
4696 * write_cnt_show - write count - number of user calls
4697 * to write(2) that have written data to tape.
4698 * @dev: struct device
4699 * @attr: attribute structure
4700 * @buf: buffer to return formatted data in
4701 */
4702static ssize_t write_cnt_show(struct device *dev,
4703 struct device_attribute *attr, char *buf)
4704{
4705 struct st_modedef *STm = dev_get_drvdata(dev);
4706
4707 return sprintf(buf, "%lld",
4708 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4709}
4710static DEVICE_ATTR_RO(write_cnt);
4711
4712/**
4713 * write_byte_cnt_show - write byte count - raw count of
4714 * bytes written to tape.
4715 * @dev: struct device
4716 * @attr: attribute structure
4717 * @buf: buffer to return formatted data in
4718 */
4719static ssize_t write_byte_cnt_show(struct device *dev,
4720 struct device_attribute *attr, char *buf)
4721{
4722 struct st_modedef *STm = dev_get_drvdata(dev);
4723
4724 return sprintf(buf, "%lld",
4725 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4726}
4727static DEVICE_ATTR_RO(write_byte_cnt);
4728
4729/**
4730 * write_ns_show - write ns - number of nanoseconds waiting on write
4731 * requests to complete.
4732 * @dev: struct device
4733 * @attr: attribute structure
4734 * @buf: buffer to return formatted data in
4735 */
4736static ssize_t write_ns_show(struct device *dev,
4737 struct device_attribute *attr, char *buf)
4738{
4739 struct st_modedef *STm = dev_get_drvdata(dev);
4740
4741 return sprintf(buf, "%lld",
4742 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4743}
4744static DEVICE_ATTR_RO(write_ns);
4745
4746/**
4747 * in_flight_show - number of I/Os currently in flight -
4748 * in most cases this will be either 0 or 1. It may be higher if someone
4749 * has also issued other SCSI commands such as via an ioctl.
4750 * @dev: struct device
4751 * @attr: attribute structure
4752 * @buf: buffer to return formatted data in
4753 */
4754static ssize_t in_flight_show(struct device *dev,
4755 struct device_attribute *attr, char *buf)
4756{
4757 struct st_modedef *STm = dev_get_drvdata(dev);
4758
4759 return sprintf(buf, "%lld",
4760 (long long)atomic64_read(&STm->tape->stats->in_flight));
4761}
4762static DEVICE_ATTR_RO(in_flight);
4763
4764/**
4765 * io_ns_show - io wait ns - this is the number of ns spent
4766 * waiting on all I/O to complete. This includes tape movement commands
4767 * such as rewinding, seeking to end of file or tape, it also includes
4768 * read and write. To determine the time spent on tape movement
4769 * subtract the read and write ns from this value.
4770 * @dev: struct device
4771 * @attr: attribute structure
4772 * @buf: buffer to return formatted data in
4773 */
4774static ssize_t io_ns_show(struct device *dev,
4775 struct device_attribute *attr, char *buf)
4776{
4777 struct st_modedef *STm = dev_get_drvdata(dev);
4778
4779 return sprintf(buf, "%lld",
4780 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4781}
4782static DEVICE_ATTR_RO(io_ns);
4783
4784/**
4785 * other_cnt_show - other io count - this is the number of
4786 * I/O requests other than read and write requests.
4787 * Typically these are tape movement requests but will include driver
4788 * tape movement. This includes only requests issued by the st driver.
4789 * @dev: struct device
4790 * @attr: attribute structure
4791 * @buf: buffer to return formatted data in
4792 */
4793static ssize_t other_cnt_show(struct device *dev,
4794 struct device_attribute *attr, char *buf)
4795{
4796 struct st_modedef *STm = dev_get_drvdata(dev);
4797
4798 return sprintf(buf, "%lld",
4799 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4800}
4801static DEVICE_ATTR_RO(other_cnt);
4802
4803/**
4804 * resid_cnt_show - A count of the number of times we get a residual
4805 * count - this should indicate someone issuing reads larger than the
4806 * block size on tape.
4807 * @dev: struct device
4808 * @attr: attribute structure
4809 * @buf: buffer to return formatted data in
4810 */
4811static ssize_t resid_cnt_show(struct device *dev,
4812 struct device_attribute *attr, char *buf)
4813{
4814 struct st_modedef *STm = dev_get_drvdata(dev);
4815
4816 return sprintf(buf, "%lld",
4817 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4818}
4819static DEVICE_ATTR_RO(resid_cnt);
4820
c69c6be5
GKH		 4821static struct attribute *st_dev_attrs[] = {
4822 &dev_attr_defined.attr,
4823 &dev_attr_default_blksize.attr,
4824 &dev_attr_default_density.attr,
4825 &dev_attr_default_compression.attr,
4826 &dev_attr_options.attr,
4827 NULL,
af23782b 4828};
05545c92
SS		 4829
4830static struct attribute *st_stats_attrs[] = {
4831 &dev_attr_read_cnt.attr,
4832 &dev_attr_read_byte_cnt.attr,
4833 &dev_attr_read_ns.attr,
4834 &dev_attr_write_cnt.attr,
4835 &dev_attr_write_byte_cnt.attr,
4836 &dev_attr_write_ns.attr,
4837 &dev_attr_in_flight.attr,
4838 &dev_attr_io_ns.attr,
4839 &dev_attr_other_cnt.attr,
4840 &dev_attr_resid_cnt.attr,
4841 NULL,
4842};
4843
4844static struct attribute_group stats_group = {
4845 .name = "stats",
4846 .attrs = st_stats_attrs,
4847};
4848
4849static struct attribute_group st_group = {
4850 .attrs = st_dev_attrs,
4851};
4852
4853static const struct attribute_group *st_dev_groups[] = {
4854 &st_group,
4855 &stats_group,
4856 NULL,
4857};
b174be02 4858
1da177e4 4859/* The following functions may be useful for a larger audience. */
6620742f
FT		 4860static int sgl_map_user_pages(struct st_buffer *STbp,
4861 const unsigned int max_pages, unsigned long uaddr,
4862 size_t count, int rw)
1da177e4 4863{
07542b83
JB		 4864 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4865 unsigned long start = uaddr >> PAGE_SHIFT;
4866 const int nr_pages = end - start;
08e9cbe7 4867 int res, i;
1da177e4 4868 struct page **pages;
6620742f 4869 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4870
1da177e4
LT		 4871 /* User attempted Overflow! */
4872 if ((uaddr + count) < uaddr)
4873 return -EINVAL;
4874
4875 /* Too big */
4876 if (nr_pages > max_pages)
4877 return -ENOMEM;
4878
4879 /* Hmm? */
4880 if (count == 0)
4881 return 0;
4882
6da2ec56
KC		 4883 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4884 if (pages == NULL)
1da177e4
LT		 4885 return -ENOMEM;
4886
4887 /* Try to fault in all of the necessary pages */
1da177e4 4888 /* rw==READ means read from drive, write into memory area */
08e9cbe7 4889 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
73b0140b 4890 pages);
1da177e4
LT		 4891
4892 /* Errors and no page mapped should return here */
4893 if (res < nr_pages)
4894 goto out_unmap;
4895
4896 for (i=0; i < nr_pages; i++) {
4897 /* FIXME: flush superflous for rw==READ,
4898 * probably wrong function for rw==WRITE
4899 */
4900 flush_dcache_page(pages[i]);
4901 }
4902
6620742f 4903 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4904 STbp->mapped_pages = pages;
1da177e4 4905
1da177e4 4906 return nr_pages;
1da177e4
LT		 4907 out_unmap:
4908 if (res > 0) {
08e9cbe7 4909 unpin_user_pages(pages, res);
6bc733e9 4910 res = 0;
1da177e4
LT		 4911 }
4912 kfree(pages);
4913 return res;
4914}
4915
4916
4917/* And unmap them... */
6620742f
FT		 4918static int sgl_unmap_user_pages(struct st_buffer *STbp,
4919 const unsigned int nr_pages, int dirtied)
1da177e4 4920{
08e9cbe7
JH		 4921 /* FIXME: cache flush missing for rw==READ */
4922 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);
b5810039 4923
6620742f
FT		 4924 kfree(STbp->mapped_pages);
4925 STbp->mapped_pages = NULL;
1da177e4
LT		 4926
4927 return 0;
4928}
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