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Merge tag 'cxl-fixes-6.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[linux-block.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 Kai.Makisara@kolumbus.fi
15
16 Some small formal changes - aeb, 950809
17
18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
19 */
20
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{
ce70fd9a 475 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
05545c92
SS		 476 ktime_t now;
477
478 now = ktime_get();
ce70fd9a 479 if (scmd->cmnd[0] == WRITE_6) {
05545c92
SS		 480 now = ktime_sub(now, STp->stats->write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
482 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
483 atomic64_inc(&STp->stats->write_cnt);
dbb4c84d 484 if (scmd->result) {
05545c92
SS		 485 atomic64_add(atomic_read(&STp->stats->last_write_size)
486 - STp->buffer->cmdstat.residual,
487 &STp->stats->write_byte_cnt);
488 if (STp->buffer->cmdstat.residual > 0)
489 atomic64_inc(&STp->stats->resid_cnt);
490 } else
491 atomic64_add(atomic_read(&STp->stats->last_write_size),
492 &STp->stats->write_byte_cnt);
ce70fd9a 493 } else if (scmd->cmnd[0] == READ_6) {
05545c92
SS		 494 now = ktime_sub(now, STp->stats->read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
496 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
497 atomic64_inc(&STp->stats->read_cnt);
dbb4c84d 498 if (scmd->result) {
05545c92
SS		 499 atomic64_add(atomic_read(&STp->stats->last_read_size)
500 - STp->buffer->cmdstat.residual,
501 &STp->stats->read_byte_cnt);
502 if (STp->buffer->cmdstat.residual > 0)
503 atomic64_inc(&STp->stats->resid_cnt);
504 } else
505 atomic64_add(atomic_read(&STp->stats->last_read_size),
506 &STp->stats->read_byte_cnt);
507 } else {
508 now = ktime_sub(now, STp->stats->other_time);
509 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
510 atomic64_inc(&STp->stats->other_cnt);
511 }
512 atomic64_dec(&STp->stats->in_flight);
513}
514
de671d61
JA		 515static enum rq_end_io_ret st_scsi_execute_end(struct request *req,
516 blk_status_t status)
13b53b44 517{
5b794f98 518 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
13b53b44
FT		 519 struct st_request *SRpnt = req->end_io_data;
520 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 521 struct bio *tmp;
13b53b44 522
dbb4c84d 523 STp->buffer->cmdstat.midlevel_result = SRpnt->result = scmd->result;
a9a4ea11 524 STp->buffer->cmdstat.residual = scmd->resid_len;
13b53b44 525
05545c92
SS		 526 st_do_stats(STp, req);
527
c68bf8ee 528 tmp = SRpnt->bio;
5b794f98
CH		 529 if (scmd->sense_len)
530 memcpy(SRpnt->sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
13b53b44
FT		 531 if (SRpnt->waiting)
532 complete(SRpnt->waiting);
533
c68bf8ee 534 blk_rq_unmap_user(tmp);
0bf6d96c 535 blk_mq_free_request(req);
de671d61 536 return RQ_END_IO_NONE;
13b53b44
FT		 537}
538
539static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
540 int data_direction, void *buffer, unsigned bufflen,
541 int timeout, int retries)
542{
543 struct request *req;
544 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
545 int err = 0;
05545c92 546 struct scsi_tape *STp = SRpnt->stp;
ce70fd9a 547 struct scsi_cmnd *scmd;
13b53b44 548
68ec3b81 549 req = scsi_alloc_request(SRpnt->stp->device->request_queue,
aebf526b 550 data_direction == DMA_TO_DEVICE ?
da6269da 551 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
a492f075 552 if (IS_ERR(req))
00da6a70 553 return PTR_ERR(req);
ce70fd9a 554 scmd = blk_mq_rq_to_pdu(req);
e8064021 555 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 556
557 mdata->null_mapped = 1;
558
02ae2c0e
KM		 559 if (bufflen) {
560 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
561 GFP_KERNEL);
562 if (err) {
0bf6d96c 563 blk_mq_free_request(req);
00da6a70 564 return err;
02ae2c0e 565 }
13b53b44
FT		 566 }
567
05545c92
SS		 568 atomic64_inc(&STp->stats->in_flight);
569 if (cmd[0] == WRITE_6) {
570 atomic_set(&STp->stats->last_write_size, bufflen);
571 STp->stats->write_time = ktime_get();
572 } else if (cmd[0] == READ_6) {
573 atomic_set(&STp->stats->last_read_size, bufflen);
574 STp->stats->read_time = ktime_get();
575 } else {
576 STp->stats->other_time = ktime_get();
577 }
578
13b53b44 579 SRpnt->bio = req->bio;
ce70fd9a
CH		 580 scmd->cmd_len = COMMAND_SIZE(cmd[0]);
581 memcpy(scmd->cmnd, cmd, scmd->cmd_len);
13b53b44 582 req->timeout = timeout;
6aded12b 583 scmd->allowed = retries;
e2e53086 584 req->end_io = st_scsi_execute_end;
13b53b44
FT		 585 req->end_io_data = SRpnt;
586
e2e53086 587 blk_execute_rq_nowait(req, true);
13b53b44
FT		 588 return 0;
589}
590
1da177e4
LT		 591/* Do the scsi command. Waits until command performed if do_wait is true.
592 Otherwise write_behind_check() is used to check that the command
593 has finished. */
8b05b773
MC		 594static struct st_request *
595st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 596 int bytes, int direction, int timeout, int retries, int do_wait)
597{
f03a5670 598 struct completion *waiting;
6d476267
FT		 599 struct rq_map_data *mdata = &STp->buffer->map_data;
600 int ret;
1da177e4 601
f03a5670
KM		 602 /* if async, make sure there's no command outstanding */
603 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 604 st_printk(KERN_ERR, STp,
605 "Async command already active.\n");
f03a5670
KM		 606 if (signal_pending(current))
607 (STp->buffer)->syscall_result = (-EINTR);
608 else
609 (STp->buffer)->syscall_result = (-EBUSY);
610 return NULL;
611 }
612
4deba245
FT		 613 if (!SRpnt) {
614 SRpnt = st_allocate_request(STp);
615 if (!SRpnt)
1da177e4 616 return NULL;
1da177e4
LT		 617 }
618
f03a5670
KM		 619 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
620 which IO is outstanding. It's nulled out when the IO completes. */
621 if (!do_wait)
622 (STp->buffer)->last_SRpnt = SRpnt;
623
624 waiting = &STp->wait;
625 init_completion(waiting);
8b05b773 626 SRpnt->waiting = waiting;
1da177e4 627
6620742f 628 if (STp->buffer->do_dio) {
c982c368 629 mdata->page_order = 0;
6620742f
FT		 630 mdata->nr_entries = STp->buffer->sg_segs;
631 mdata->pages = STp->buffer->mapped_pages;
632 } else {
c982c368 633 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 634 mdata->nr_entries =
635 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 636 mdata->pages = STp->buffer->reserved_pages;
637 mdata->offset = 0;
6d476267
FT		 638 }
639
8b05b773
MC		 640 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
641 STp->buffer->cmdstat.have_sense = 0;
642 STp->buffer->syscall_result = 0;
643
6620742f
FT		 644 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
645 retries);
6d476267 646 if (ret) {
8b05b773
MC		 647 /* could not allocate the buffer or request was too large */
648 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 649 (STp->buffer)->last_SRpnt = NULL;
6d476267 650 } else if (do_wait) {
f03a5670 651 wait_for_completion(waiting);
8b05b773 652 SRpnt->waiting = NULL;
1da177e4
LT		 653 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
654 }
8b05b773 655
1da177e4
LT		 656 return SRpnt;
657}
658
659
660/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
661 write has been correct but EOM early warning reached, -EIO if write ended in
662 error or zero if write successful. Asynchronous writes are used only in
663 variable block mode. */
664static int write_behind_check(struct scsi_tape * STp)
665{
666 int retval = 0;
667 struct st_buffer *STbuffer;
668 struct st_partstat *STps;
669 struct st_cmdstatus *cmdstatp;
8b05b773 670 struct st_request *SRpnt;
1da177e4
LT		 671
672 STbuffer = STp->buffer;
673 if (!STbuffer->writing)
674 return 0;
675
b30d8bca 676 DEB(
1da177e4
LT		 677 if (STp->write_pending)
678 STp->nbr_waits++;
679 else
680 STp->nbr_finished++;
b30d8bca 681 ) /* end DEB */
1da177e4
LT		 682
683 wait_for_completion(&(STp->wait));
f03a5670
KM		 684 SRpnt = STbuffer->last_SRpnt;
685 STbuffer->last_SRpnt = NULL;
8b05b773 686 SRpnt->waiting = NULL;
1da177e4 687
f03a5670 688 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 689 st_release_request(SRpnt);
1da177e4
LT		 690
691 STbuffer->buffer_bytes -= STbuffer->writing;
692 STps = &(STp->ps[STp->partition]);
693 if (STps->drv_block >= 0) {
694 if (STp->block_size == 0)
695 STps->drv_block++;
696 else
697 STps->drv_block += STbuffer->writing / STp->block_size;
698 }
699
700 cmdstatp = &STbuffer->cmdstat;
701 if (STbuffer->syscall_result) {
702 retval = -EIO;
703 if (cmdstatp->have_sense && !cmdstatp->deferred &&
704 (cmdstatp->flags & SENSE_EOM) &&
705 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
706 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
707 /* EOM at write-behind, has all data been written? */
708 if (!cmdstatp->remainder_valid ||
709 cmdstatp->uremainder64 == 0)
710 retval = -ENOSPC;
711 }
712 if (retval == -EIO)
713 STps->drv_block = -1;
714 }
715 STbuffer->writing = 0;
716
717 DEB(if (debugging && retval)
b30d8bca
HR		 718 st_printk(ST_DEB_MSG, STp,
719 "Async write error %x, return value %d.\n",
720 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 721
722 return retval;
723}
724
725
726/* Step over EOF if it has been inadvertently crossed (ioctl not used because
727 it messes up the block number). */
728static int cross_eof(struct scsi_tape * STp, int forward)
729{
8b05b773 730 struct st_request *SRpnt;
1da177e4
LT		 731 unsigned char cmd[MAX_COMMAND_SIZE];
732
733 cmd[0] = SPACE;
734 cmd[1] = 0x01; /* Space FileMarks */
735 if (forward) {
736 cmd[2] = cmd[3] = 0;
737 cmd[4] = 1;
738 } else
739 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
740 cmd[5] = 0;
741
b30d8bca
HR		 742 DEBC_printk(STp, "Stepping over filemark %s.\n",
743 forward ? "forward" : "backward");
1da177e4 744
02ae2c0e
KM		 745 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
746 STp->device->request_queue->rq_timeout,
747 MAX_RETRIES, 1);
1da177e4 748 if (!SRpnt)
02ae2c0e 749 return (STp->buffer)->syscall_result;
39ade4b1 750
02ae2c0e
KM		 751 st_release_request(SRpnt);
752 SRpnt = NULL;
1da177e4
LT		 753
754 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 755 st_printk(KERN_ERR, STp,
756 "Stepping over filemark %s failed.\n",
757 forward ? "forward" : "backward");
1da177e4 758
02ae2c0e 759 return (STp->buffer)->syscall_result;
1da177e4
LT		 760}
761
762
763/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 764static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 765{
786231af 766 int transfer, blks;
1da177e4
LT		 767 int result;
768 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 769 struct st_request *SRpnt;
1da177e4
LT		 770 struct st_partstat *STps;
771
772 result = write_behind_check(STp);
773 if (result)
774 return result;
775
776 result = 0;
777 if (STp->dirty == 1) {
778
786231af 779 transfer = STp->buffer->buffer_bytes;
b30d8bca 780 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 781
1da177e4
LT		 782 memset(cmd, 0, MAX_COMMAND_SIZE);
783 cmd[0] = WRITE_6;
784 cmd[1] = 1;
785 blks = transfer / STp->block_size;
786 cmd[2] = blks >> 16;
787 cmd[3] = blks >> 8;
788 cmd[4] = blks;
789
790 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 791 STp->device->request_queue->rq_timeout,
792 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 793 if (!SRpnt)
794 return (STp->buffer)->syscall_result;
795
796 STps = &(STp->ps[STp->partition]);
797 if ((STp->buffer)->syscall_result != 0) {
798 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
799
800 if (cmdstatp->have_sense && !cmdstatp->deferred &&
801 (cmdstatp->flags & SENSE_EOM) &&
802 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
803 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
804 (!cmdstatp->remainder_valid ||
805 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
806 STp->dirty = 0;
807 (STp->buffer)->buffer_bytes = 0;
808 if (STps->drv_block >= 0)
809 STps->drv_block += blks;
810 result = (-ENOSPC);
811 } else {
b30d8bca 812 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 813 STps->drv_block = (-1);
814 result = (-EIO);
815 }
816 } else {
817 if (STps->drv_block >= 0)
818 STps->drv_block += blks;
819 STp->dirty = 0;
820 (STp->buffer)->buffer_bytes = 0;
821 }
8b05b773 822 st_release_request(SRpnt);
1da177e4
LT		 823 SRpnt = NULL;
824 }
825 return result;
826}
827
828
829/* Flush the tape buffer. The tape will be positioned correctly unless
830 seek_next is true. */
831static int flush_buffer(struct scsi_tape *STp, int seek_next)
832{
833 int backspace, result;
1da177e4
LT		 834 struct st_partstat *STps;
835
1da177e4
LT		 836 /*
837 * If there was a bus reset, block further access
838 * to this device.
839 */
840 if (STp->pos_unknown)
841 return (-EIO);
842
843 if (STp->ready != ST_READY)
844 return 0;
845 STps = &(STp->ps[STp->partition]);
846 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 847 return st_flush_write_buffer(STp);
1da177e4
LT		 848
849 if (STp->block_size == 0)
850 return 0;
851
852 backspace = ((STp->buffer)->buffer_bytes +
853 (STp->buffer)->read_pointer) / STp->block_size -
854 ((STp->buffer)->read_pointer + STp->block_size - 1) /
855 STp->block_size;
856 (STp->buffer)->buffer_bytes = 0;
857 (STp->buffer)->read_pointer = 0;
858 result = 0;
859 if (!seek_next) {
860 if (STps->eof == ST_FM_HIT) {
861 result = cross_eof(STp, 0); /* Back over the EOF hit */
862 if (!result)
863 STps->eof = ST_NOEOF;
864 else {
865 if (STps->drv_file >= 0)
866 STps->drv_file++;
867 STps->drv_block = 0;
868 }
869 }
870 if (!result && backspace > 0)
871 result = st_int_ioctl(STp, MTBSR, backspace);
872 } else if (STps->eof == ST_FM_HIT) {
873 if (STps->drv_file >= 0)
874 STps->drv_file++;
875 STps->drv_block = 0;
876 STps->eof = ST_NOEOF;
877 }
878 return result;
879
880}
881\f
882/* Set the mode parameters */
883static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
884{
885 int set_it = 0;
886 unsigned long arg;
1da177e4
LT		 887
888 if (!STp->density_changed &&
889 STm->default_density >= 0 &&
890 STm->default_density != STp->density) {
891 arg = STm->default_density;
892 set_it = 1;
893 } else
894 arg = STp->density;
895 arg <<= MT_ST_DENSITY_SHIFT;
896 if (!STp->blksize_changed &&
897 STm->default_blksize >= 0 &&
898 STm->default_blksize != STp->block_size) {
899 arg |= STm->default_blksize;
900 set_it = 1;
901 } else
902 arg |= STp->block_size;
903 if (set_it &&
904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
b30d8bca
HR		 905 st_printk(KERN_WARNING, STp,
906 "Can't set default block size to %d bytes "
907 "and density %x.\n",
908 STm->default_blksize, STm->default_density);
1da177e4
LT		 909 if (modes_defined)
910 return (-EINVAL);
911 }
912 return 0;
913}
914
915
8b05b773 916/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 917static int do_door_lock(struct scsi_tape * STp, int do_lock)
918{
dccfa688 919 int retval;
1da177e4 920
b30d8bca 921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
dccfa688
CH		 922
923 retval = scsi_set_medium_removal(STp->device,
924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
925 if (!retval)
1da177e4 926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
dccfa688 927 else
1da177e4 928 STp->door_locked = ST_LOCK_FAILS;
1da177e4
LT		 929 return retval;
930}
931
932
933/* Set the internal state after reset */
934static void reset_state(struct scsi_tape *STp)
935{
936 int i;
937 struct st_partstat *STps;
938
939 STp->pos_unknown = 0;
940 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
941 STps = &(STp->ps[i]);
942 STps->rw = ST_IDLE;
943 STps->eof = ST_NOEOF;
944 STps->at_sm = 0;
945 STps->last_block_valid = 0;
946 STps->drv_block = -1;
947 STps->drv_file = -1;
948 }
949 if (STp->can_partitions) {
950 STp->partition = find_partition(STp);
951 if (STp->partition < 0)
952 STp->partition = 0;
953 STp->new_partition = STp->partition;
954 }
955}
956\f
957/* Test if the drive is ready. Returns either one of the codes below or a negative system
958 error code. */
959#define CHKRES_READY 0
960#define CHKRES_NEW_SESSION 1
961#define CHKRES_NOT_READY 2
962#define CHKRES_NO_TAPE 3
963
964#define MAX_ATTENTIONS 10
965
966static int test_ready(struct scsi_tape *STp, int do_wait)
967{
968 int attentions, waits, max_wait, scode;
969 int retval = CHKRES_READY, new_session = 0;
970 unsigned char cmd[MAX_COMMAND_SIZE];
02ae2c0e 971 struct st_request *SRpnt = NULL;
1da177e4
LT		 972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
973
974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
975
976 for (attentions=waits=0; ; ) {
977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
978 cmd[0] = TEST_UNIT_READY;
02ae2c0e
KM		 979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
980 STp->long_timeout, MAX_READY_RETRIES, 1);
1da177e4 981
02ae2c0e
KM		 982 if (!SRpnt) {
983 retval = (STp->buffer)->syscall_result;
1da177e4 984 break;
02ae2c0e 985 }
1da177e4
LT		 986
987 if (cmdstatp->have_sense) {
988
989 scode = cmdstatp->sense_hdr.sense_key;
990
991 if (scode == UNIT_ATTENTION) { /* New media? */
992 new_session = 1;
993 if (attentions < MAX_ATTENTIONS) {
994 attentions++;
995 continue;
996 }
997 else {
998 retval = (-EIO);
999 break;
1000 }
1001 }
1002
1003 if (scode == NOT_READY) {
1004 if (waits < max_wait) {
1005 if (msleep_interruptible(1000)) {
1006 retval = (-EINTR);
1007 break;
1008 }
1009 waits++;
1010 continue;
1011 }
1012 else {
1013 if ((STp->device)->scsi_level >= SCSI_2 &&
1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1015 retval = CHKRES_NO_TAPE;
1016 else
1017 retval = CHKRES_NOT_READY;
1018 break;
1019 }
1020 }
1021 }
1022
1023 retval = (STp->buffer)->syscall_result;
1024 if (!retval)
1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1026 break;
1027 }
1028
02ae2c0e
KM		 1029 if (SRpnt != NULL)
1030 st_release_request(SRpnt);
1da177e4
LT		 1031 return retval;
1032}
1033
1034
1035/* See if the drive is ready and gather information about the tape. Return values:
1036 < 0 negative error code from errno.h
1037 0 drive ready
1038 1 drive not ready (possibly no tape)
1039*/
1040static int check_tape(struct scsi_tape *STp, struct file *filp)
1041{
1042 int i, retval, new_session = 0, do_wait;
1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1044 unsigned short st_flags = filp->f_flags;
8b05b773 1045 struct st_request *SRpnt = NULL;
1da177e4
LT		 1046 struct st_modedef *STm;
1047 struct st_partstat *STps;
496ad9aa 1048 struct inode *inode = file_inode(filp);
1da177e4
LT		 1049 int mode = TAPE_MODE(inode);
1050
1051 STp->ready = ST_READY;
1052
1053 if (mode != STp->current_mode) {
b30d8bca
HR		 1054 DEBC_printk(STp, "Mode change from %d to %d.\n",
1055 STp->current_mode, mode);
1da177e4
LT		 1056 new_session = 1;
1057 STp->current_mode = mode;
1058 }
1059 STm = &(STp->modes[STp->current_mode]);
1060
1061 saved_cleaning = STp->cleaning_req;
1062 STp->cleaning_req = 0;
1063
1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1065 retval = test_ready(STp, do_wait);
1066
1067 if (retval < 0)
1068 goto err_out;
1069
1070 if (retval == CHKRES_NEW_SESSION) {
1071 STp->pos_unknown = 0;
1072 STp->partition = STp->new_partition = 0;
1073 if (STp->can_partitions)
1074 STp->nbr_partitions = 1; /* This guess will be updated later
1075 if necessary */
1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1077 STps = &(STp->ps[i]);
1078 STps->rw = ST_IDLE;
1079 STps->eof = ST_NOEOF;
1080 STps->at_sm = 0;
1081 STps->last_block_valid = 0;
1082 STps->drv_block = 0;
1083 STps->drv_file = 0;
1084 }
1085 new_session = 1;
1086 }
1087 else {
1088 STp->cleaning_req |= saved_cleaning;
1089
1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1091 if (retval == CHKRES_NO_TAPE)
1092 STp->ready = ST_NO_TAPE;
1093 else
1094 STp->ready = ST_NOT_READY;
1095
1096 STp->density = 0; /* Clear the erroneous "residue" */
1097 STp->write_prot = 0;
1098 STp->block_size = 0;
1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1100 STp->partition = STp->new_partition = 0;
1101 STp->door_locked = ST_UNLOCKED;
1102 return CHKRES_NOT_READY;
1103 }
1104 }
1105
1106 if (STp->omit_blklims)
1107 STp->min_block = STp->max_block = (-1);
1108 else {
1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1110 cmd[0] = READ_BLOCK_LIMITS;
1111
02ae2c0e
KM		 1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1113 STp->device->request_queue->rq_timeout,
1114 MAX_READY_RETRIES, 1);
1115 if (!SRpnt) {
1116 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1117 goto err_out;
1118 }
1119
8b05b773 1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1124 (STp->buffer)->b_data[5];
1125 if ( DEB( debugging || ) !STp->inited)
b30d8bca
HR		 1126 st_printk(KERN_INFO, STp,
1127 "Block limits %d - %d bytes.\n",
1128 STp->min_block, STp->max_block);
1da177e4
LT		 1129 } else {
1130 STp->min_block = STp->max_block = (-1);
b30d8bca 1131 DEBC_printk(STp, "Can't read block limits.\n");
1da177e4
LT		 1132 }
1133 }
1134
1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1136 cmd[0] = MODE_SENSE;
1137 cmd[4] = 12;
1138
02ae2c0e
KM		 1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1140 STp->device->request_queue->rq_timeout,
1141 MAX_READY_RETRIES, 1);
1142 if (!SRpnt) {
1143 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1144 goto err_out;
1145 }
1146
1147 if ((STp->buffer)->syscall_result != 0) {
b30d8bca 1148 DEBC_printk(STp, "No Mode Sense.\n");
1da177e4
LT		 1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1151 STp->drv_write_prot = 0;
1152 } else {
b30d8bca
HR		 1153 DEBC_printk(STp,"Mode sense. Length %d, "
1154 "medium %x, WBS %x, BLL %d\n",
1155 (STp->buffer)->b_data[0],
1156 (STp->buffer)->b_data[1],
1157 (STp->buffer)->b_data[2],
1158 (STp->buffer)->b_data[3]);
1da177e4
LT		 1159
1160 if ((STp->buffer)->b_data[3] >= 8) {
1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1162 STp->density = (STp->buffer)->b_data[4];
1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
b30d8bca
HR		 1165 DEBC_printk(STp, "Density %x, tape length: %x, "
1166 "drv buffer: %d\n",
1167 STp->density,
1168 (STp->buffer)->b_data[5] * 65536 +
1169 (STp->buffer)->b_data[6] * 256 +
1170 (STp->buffer)->b_data[7],
1171 STp->drv_buffer);
1da177e4
LT		 1172 }
1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
c743e44f 1174 if (!STp->drv_buffer && STp->immediate_filemark) {
b30d8bca
HR		 1175 st_printk(KERN_WARNING, STp,
1176 "non-buffered tape: disabling "
1177 "writing immediate filemarks\n");
c743e44f
LD		 1178 STp->immediate_filemark = 0;
1179 }
1da177e4 1180 }
8b05b773 1181 st_release_request(SRpnt);
1da177e4 1182 SRpnt = NULL;
b30d8bca 1183 STp->inited = 1;
1da177e4
LT		 1184
1185 if (STp->block_size > 0)
1186 (STp->buffer)->buffer_blocks =
b30d8bca 1187 (STp->buffer)->buffer_size / STp->block_size;
1da177e4
LT		 1188 else
1189 (STp->buffer)->buffer_blocks = 1;
1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1191
b30d8bca
HR		 1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1193 STp->block_size, (STp->buffer)->buffer_size,
1194 (STp->buffer)->buffer_blocks);
1da177e4
LT		 1195
1196 if (STp->drv_write_prot) {
1197 STp->write_prot = 1;
1198
b30d8bca 1199 DEBC_printk(STp, "Write protected\n");
1da177e4
LT		 1200
1201 if (do_wait &&
1202 ((st_flags & O_ACCMODE) == O_WRONLY ||
1203 (st_flags & O_ACCMODE) == O_RDWR)) {
1204 retval = (-EROFS);
1205 goto err_out;
1206 }
1207 }
1208
1209 if (STp->can_partitions && STp->nbr_partitions < 1) {
1210 /* This code is reached when the device is opened for the first time
1211 after the driver has been initialized with tape in the drive and the
1212 partition support has been enabled. */
b30d8bca 1213 DEBC_printk(STp, "Updating partition number in status.\n");
1da177e4
LT		 1214 if ((STp->partition = find_partition(STp)) < 0) {
1215 retval = STp->partition;
1216 goto err_out;
1217 }
1218 STp->new_partition = STp->partition;
1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1220 }
1221
1222 if (new_session) { /* Change the drive parameters for the new mode */
1223 STp->density_changed = STp->blksize_changed = 0;
1224 STp->compression_changed = 0;
1225 if (!(STm->defaults_for_writes) &&
1226 (retval = set_mode_densblk(STp, STm)) < 0)
1227 goto err_out;
1228
1229 if (STp->default_drvbuffer != 0xff) {
1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
b30d8bca
HR		 1231 st_printk(KERN_WARNING, STp,
1232 "Can't set default drive "
1233 "buffering to %d.\n",
1234 STp->default_drvbuffer);
1da177e4
LT		 1235 }
1236 }
1237
1238 return CHKRES_READY;
1239
1240 err_out:
1241 return retval;
1242}
1243
1244
b3369c68 1245\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1246 module count. */
1247static int st_open(struct inode *inode, struct file *filp)
1248{
1249 int i, retval = (-EIO);
46a243f7 1250 int resumed = 0;
1da177e4
LT		 1251 struct scsi_tape *STp;
1252 struct st_partstat *STps;
1253 int dev = TAPE_NR(inode);
1da177e4
LT		 1254
1255 /*
1256 * We really want to do nonseekable_open(inode, filp); here, but some
1257 * versions of tar incorrectly call lseek on tapes and bail out if that
1258 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1259 */
1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1261
b3369c68 1262 if (!(STp = scsi_tape_get(dev))) {
f03a5670 1263 return -ENXIO;
b3369c68 1264 }
f03a5670 1265
1da177e4 1266 filp->private_data = STp;
1da177e4 1267
6c648d95 1268 spin_lock(&st_use_lock);
1da177e4 1269 if (STp->in_use) {
6c648d95 1270 spin_unlock(&st_use_lock);
b30d8bca 1271 DEBC_printk(STp, "Device already in use.\n");
c8c165de 1272 scsi_tape_put(STp);
1da177e4
LT		 1273 return (-EBUSY);
1274 }
1275
1da177e4 1276 STp->in_use = 1;
6c648d95 1277 spin_unlock(&st_use_lock);
1da177e4
LT		 1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1279
46a243f7
ON		 1280 if (scsi_autopm_get_device(STp->device) < 0) {
1281 retval = -EIO;
1282 goto err_out;
1283 }
1284 resumed = 1;
1da177e4
LT		 1285 if (!scsi_block_when_processing_errors(STp->device)) {
1286 retval = (-ENXIO);
1287 goto err_out;
1288 }
1289
1290 /* See that we have at least a one page buffer available */
aaff5eba 1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE)) {
b30d8bca
HR		 1292 st_printk(KERN_WARNING, STp,
1293 "Can't allocate one page tape buffer.\n");
1da177e4
LT		 1294 retval = (-EOVERFLOW);
1295 goto err_out;
1296 }
1297
40f6b36c 1298 (STp->buffer)->cleared = 0;
1da177e4
LT		 1299 (STp->buffer)->writing = 0;
1300 (STp->buffer)->syscall_result = 0;
1301
1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1303
1304 STp->dirty = 0;
1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1306 STps = &(STp->ps[i]);
1307 STps->rw = ST_IDLE;
1308 }
9abe16c6 1309 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1310 STp->recover_count = 0;
1311 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1313
1314 retval = check_tape(STp, filp);
1315 if (retval < 0)
1316 goto err_out;
1317 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1318 retval != CHKRES_READY) {
413f7327
KM		 1319 if (STp->ready == NO_TAPE)
1320 retval = (-ENOMEDIUM);
1321 else
1322 retval = (-EIO);
1da177e4
LT		 1323 goto err_out;
1324 }
1325 return 0;
1326
1327 err_out:
1328 normalize_buffer(STp->buffer);
0644f539 1329 spin_lock(&st_use_lock);
1da177e4 1330 STp->in_use = 0;
0644f539 1331 spin_unlock(&st_use_lock);
46a243f7
ON		 1332 if (resumed)
1333 scsi_autopm_put_device(STp->device);
e7ac6c66 1334 scsi_tape_put(STp);
1da177e4
LT		 1335 return retval;
1336
1337}
1338\f
1339
1340/* Flush the tape buffer before close */
75e1fcc0 1341static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1342{
1343 int result = 0, result2;
1344 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1345 struct st_request *SRpnt;
1da177e4
LT		 1346 struct scsi_tape *STp = filp->private_data;
1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1348 struct st_partstat *STps = &(STp->ps[STp->partition]);
1da177e4
LT		 1349
1350 if (file_count(filp) > 1)
1351 return 0;
1352
1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1354 result = st_flush_write_buffer(STp);
1da177e4
LT		 1355 if (result != 0 && result != (-ENOSPC))
1356 goto out;
1357 }
1358
1359 if (STp->can_partitions &&
1360 (result2 = switch_partition(STp)) < 0) {
b30d8bca 1361 DEBC_printk(STp, "switch_partition at close failed.\n");
1da177e4
LT		 1362 if (result == 0)
1363 result = result2;
1364 goto out;
1365 }
1366
1367 DEBC( if (STp->nbr_requests)
b30d8bca
HR		 1368 st_printk(KERN_DEBUG, STp,
1369 "Number of r/w requests %d, dio used in %d, "
1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1371 STp->nbr_pages));
1da177e4
LT		 1372
1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1375
b30d8bca
HR		 1376#if DEBUG
1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1378 STp->nbr_waits, STp->nbr_finished);
1379#endif
1da177e4
LT		 1380 memset(cmd, 0, MAX_COMMAND_SIZE);
1381 cmd[0] = WRITE_FILEMARKS;
c743e44f
LD		 1382 if (STp->immediate_filemark)
1383 cmd[1] = 1;
1da177e4
LT		 1384 cmd[4] = 1 + STp->two_fm;
1385
02ae2c0e
KM		 1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1387 STp->device->request_queue->rq_timeout,
1388 MAX_WRITE_RETRIES, 1);
1da177e4 1389 if (!SRpnt) {
02ae2c0e 1390 result = (STp->buffer)->syscall_result;
1da177e4
LT		 1391 goto out;
1392 }
1393
1394 if (STp->buffer->syscall_result == 0 ||
1395 (cmdstatp->have_sense && !cmdstatp->deferred &&
1396 (cmdstatp->flags & SENSE_EOM) &&
1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1400 /* Write successful at EOM */
8b05b773 1401 st_release_request(SRpnt);
1da177e4
LT		 1402 SRpnt = NULL;
1403 if (STps->drv_file >= 0)
1404 STps->drv_file++;
1405 STps->drv_block = 0;
1406 if (STp->two_fm)
1407 cross_eof(STp, 0);
1408 STps->eof = ST_FM;
1409 }
1410 else { /* Write error */
8b05b773 1411 st_release_request(SRpnt);
1da177e4 1412 SRpnt = NULL;
b30d8bca
HR		 1413 st_printk(KERN_ERR, STp,
1414 "Error on write filemark.\n");
1da177e4
LT		 1415 if (result == 0)
1416 result = (-EIO);
1417 }
1418
b30d8bca 1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1da177e4
LT		 1420 } else if (!STp->rew_at_close) {
1421 STps = &(STp->ps[STp->partition]);
1422 if (!STm->sysv || STps->rw != ST_READING) {
1423 if (STp->can_bsr)
1424 result = flush_buffer(STp, 0);
1425 else if (STps->eof == ST_FM_HIT) {
1426 result = cross_eof(STp, 0);
1427 if (result) {
1428 if (STps->drv_file >= 0)
1429 STps->drv_file++;
1430 STps->drv_block = 0;
1431 STps->eof = ST_FM;
1432 } else
1433 STps->eof = ST_NOEOF;
1434 }
1435 } else if ((STps->eof == ST_NOEOF &&
1436 !(result = cross_eof(STp, 1))) ||
1437 STps->eof == ST_FM_HIT) {
1438 if (STps->drv_file >= 0)
1439 STps->drv_file++;
1440 STps->drv_block = 0;
1441 STps->eof = ST_FM;
1442 }
1443 }
1444
1445 out:
1446 if (STp->rew_at_close) {
1447 result2 = st_int_ioctl(STp, MTREW, 1);
1448 if (result == 0)
1449 result = result2;
1450 }
1451 return result;
1452}
1453
1454
1455/* Close the device and release it. BKL is not needed: this is the only thread
1456 accessing this tape. */
1457static int st_release(struct inode *inode, struct file *filp)
1458{
1da177e4
LT		 1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
6c648d95 1465 spin_lock(&st_use_lock);
1da177e4 1466 STp->in_use = 0;
6c648d95 1467 spin_unlock(&st_use_lock);
46a243f7 1468 scsi_autopm_put_device(STp->device);
f03a5670 1469 scsi_tape_put(STp);
1da177e4 1470
ec341439 1471 return 0;
1da177e4 1472}
ec341439 1473
1da177e4
LT		 1474/* The checks common to both reading and writing */
1475static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476{
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
b30d8bca 1516 DEB(
1da177e4 1517 if (!STp->in_use) {
b30d8bca
HR		 1518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
1da177e4
LT		 1520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545{
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
9abe16c6 1550 i = STp->try_dio_now && try_rdio;
1da177e4 1551 else
9abe16c6 1552 i = STp->try_dio_now && try_wdio;
8b05b773 1553
1da177e4
LT		 1554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
6620742f
FT		 1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
1da177e4
LT		 1558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
1da177e4
LT		 1565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
1da177e4
LT		 1569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
40f6b36c 1579 else {
1da177e4 1580 bufsize = count;
40f6b36c
KM		 1581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
1da177e4 1587 if (bufsize > STbp->buffer_size &&
aaff5eba 1588 !enlarge_buffer(STbp, bufsize)) {
b30d8bca
HR		 1589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
1da177e4
LT		 1592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601}
1602
1603
1604/* Can be called more than once after each setup_buffer() */
787926b1 1605static void release_buffering(struct scsi_tape *STp, int is_read)
1da177e4
LT		 1606{
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
6620742f 1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1da177e4 1612 STbp->do_dio = 0;
787926b1 1613 STbp->sg_segs = 0;
1da177e4
LT		 1614 }
1615}
1616
1617
1618/* Write command */
1619static ssize_t
1620st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621{
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
8b05b773 1629 struct st_request *SRpnt = NULL;
1da177e4
LT		 1630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
1da177e4 1634
28f85009 1635 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 1636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
b30d8bca
HR		 1644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
1da177e4
LT		 1646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
b30d8bca
HR		 1671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
1da177e4
LT		 1673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
9abe16c6 1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1da177e4
LT		 1752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 1775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
1da177e4
LT		 1777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
8b05b773 1781 if (async_write && !STbp->syscall_result) {
1da177e4
LT		 1782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
b30d8bca 1793 DEBC_printk(STp, "Error on write:\n");
1da177e4
LT		 1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
626dcb1e 1808 b_point -= undone;
1da177e4
LT		 1809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
b30d8bca
HR		 1820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
1da177e4
LT		 1823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
b30d8bca
HR		 1835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
1da177e4
LT		 1839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
b30d8bca
HR		 1849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
1da177e4
LT		 1851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
8b05b773 1856 retval = STbp->syscall_result;
1da177e4
LT		 1857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
8b05b773 1886 st_release_request(SRpnt);
787926b1 1887 release_buffering(STp, 0);
28f85009 1888 mutex_unlock(&STp->lock);
1da177e4
LT		 1889
1890 return retval;
1891}
1892\f
1893/* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898*/
1899static long read_tape(struct scsi_tape *STp, long count,
8b05b773 1900 struct st_request ** aSRpnt)
1da177e4
LT		 1901{
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1904 struct st_request *SRpnt;
1da177e4
LT		 1905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
1da177e4
LT		 1909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
9abe16c6 1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1da177e4
LT		 1923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
40f6b36c
KM		 1937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
1da177e4
LT		 1939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
a02488ed
JB		 1945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
787926b1 1947 release_buffering(STp, 1);
1da177e4
LT		 1948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
b30d8bca
HR		 1960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
1da177e4
LT		 1966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
5e4fabb6
KM		 1977 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1978 if (STp->block_size == 0)
1979 transfer = bytes;
1980 /* Some drives set ILI with MEDIUM ERROR */
1981 cmdstatp->flags &= ~SENSE_ILI;
1982 }
1da177e4
LT		 1983
1984 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
b30d8bca
HR		 1985 if (STp->block_size == 0 &&
1986 transfer < 0) {
1987 st_printk(KERN_NOTICE, STp,
1988 "Failed to read %d "
1989 "byte block with %d "
1990 "byte transfer.\n",
1991 bytes - transfer,
1992 bytes);
1993 if (STps->drv_block >= 0)
1994 STps->drv_block += 1;
1995 STbp->buffer_bytes = 0;
1996 return (-ENOMEM);
1997 } else if (STp->block_size == 0) {
1da177e4
LT		 1998 STbp->buffer_bytes = bytes - transfer;
1999 } else {
8b05b773 2000 st_release_request(SRpnt);
1da177e4
LT		 2001 SRpnt = *aSRpnt = NULL;
2002 if (transfer == blks) { /* We did not get anything, error */
b30d8bca
HR		 2003 st_printk(KERN_NOTICE, STp,
2004 "Incorrect "
2005 "block size.\n");
1da177e4
LT		 2006 if (STps->drv_block >= 0)
2007 STps->drv_block += blks - transfer + 1;
2008 st_int_ioctl(STp, MTBSR, 1);
2009 return (-EIO);
2010 }
2011 /* We have some data, deliver it */
2012 STbp->buffer_bytes = (blks - transfer) *
2013 STp->block_size;
b30d8bca
HR		 2014 DEBC_printk(STp, "ILI but "
2015 "enough data "
2016 "received %ld "
2017 "%d.\n", count,
2018 STbp->buffer_bytes);
1da177e4
LT		 2019 if (STps->drv_block >= 0)
2020 STps->drv_block += 1;
2021 if (st_int_ioctl(STp, MTBSR, 1))
2022 return (-EIO);
2023 }
2024 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2025 if (STps->eof != ST_FM_HIT)
2026 STps->eof = ST_FM_HIT;
2027 else
2028 STps->eof = ST_EOD_2;
2029 if (STp->block_size == 0)
2030 STbp->buffer_bytes = 0;
2031 else
2032 STbp->buffer_bytes =
2033 bytes - transfer * STp->block_size;
b30d8bca
HR		 2034 DEBC_printk(STp, "EOF detected (%d "
2035 "bytes read).\n",
2036 STbp->buffer_bytes);
1da177e4
LT		 2037 } else if (cmdstatp->flags & SENSE_EOM) {
2038 if (STps->eof == ST_FM)
2039 STps->eof = ST_EOD_1;
2040 else
2041 STps->eof = ST_EOM_OK;
2042 if (STp->block_size == 0)
2043 STbp->buffer_bytes = bytes - transfer;
2044 else
2045 STbp->buffer_bytes =
2046 bytes - transfer * STp->block_size;
2047
b30d8bca
HR		 2048 DEBC_printk(STp, "EOM detected (%d "
2049 "bytes read).\n",
2050 STbp->buffer_bytes);
1da177e4
LT		 2051 }
2052 }
b30d8bca 2053 /* end of EOF, EOM, ILI test */
1da177e4 2054 else { /* nonzero sense key */
b30d8bca 2055 DEBC_printk(STp, "Tape error while reading.\n");
1da177e4
LT		 2056 STps->drv_block = (-1);
2057 if (STps->eof == ST_FM &&
2058 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
b30d8bca
HR		 2059 DEBC_printk(STp, "Zero returned for "
2060 "first BLANK CHECK "
2061 "after EOF.\n");
1da177e4
LT		 2062 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2063 } else /* Some other extended sense code */
2064 retval = (-EIO);
2065 }
2066
2067 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2068 STbp->buffer_bytes = 0;
2069 }
b30d8bca 2070 /* End of extended sense test */
1da177e4
LT		 2071 else { /* Non-extended sense */
2072 retval = STbp->syscall_result;
2073 }
2074
2075 }
b30d8bca 2076 /* End of error handling */
40f6b36c 2077 else { /* Read successful */
1da177e4 2078 STbp->buffer_bytes = bytes;
40f6b36c
KM		 2079 if (STp->sili) /* In fixed block mode residual is always zero here */
2080 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2081 }
1da177e4
LT		 2082
2083 if (STps->drv_block >= 0) {
2084 if (STp->block_size == 0)
2085 STps->drv_block++;
2086 else
2087 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2088 }
2089 return retval;
2090}
2091\f
2092
2093/* Read command */
2094static ssize_t
2095st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2096{
2097 ssize_t total;
2098 ssize_t retval = 0;
2099 ssize_t i, transfer;
2100 int special, do_dio = 0;
8b05b773 2101 struct st_request *SRpnt = NULL;
1da177e4
LT		 2102 struct scsi_tape *STp = filp->private_data;
2103 struct st_modedef *STm;
2104 struct st_partstat *STps;
2105 struct st_buffer *STbp = STp->buffer;
1da177e4 2106
28f85009 2107 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2108 return -ERESTARTSYS;
2109
2110 retval = rw_checks(STp, filp, count);
2111 if (retval || count == 0)
2112 goto out;
2113
2114 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2115 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2116 if (!STm->do_read_ahead) {
2117 retval = (-EINVAL); /* Read must be integral number of blocks */
2118 goto out;
2119 }
2120 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2121 }
2122
2123 STps = &(STp->ps[STp->partition]);
2124 if (STps->rw == ST_WRITING) {
2125 retval = flush_buffer(STp, 0);
2126 if (retval)
2127 goto out;
2128 STps->rw = ST_READING;
2129 }
b30d8bca 2130 DEB(
1da177e4 2131 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2132 st_printk(ST_DEB_MSG, STp,
2133 "EOF/EOM flag up (%d). Bytes %d\n",
2134 STps->eof, STbp->buffer_bytes);
2135 ) /* end DEB */
1da177e4
LT		 2136
2137 retval = setup_buffering(STp, buf, count, 1);
2138 if (retval)
2139 goto out;
2140 do_dio = STbp->do_dio;
2141
2142 if (STbp->buffer_bytes == 0 &&
2143 STps->eof >= ST_EOD_1) {
2144 if (STps->eof < ST_EOD) {
2145 STps->eof += 1;
2146 retval = 0;
2147 goto out;
2148 }
2149 retval = (-EIO); /* EOM or Blank Check */
2150 goto out;
2151 }
2152
2153 if (do_dio) {
2154 /* Check the buffer writability before any tape movement. Don't alter
2155 buffer data. */
2156 if (copy_from_user(&i, buf, 1) != 0 ||
2157 copy_to_user(buf, &i, 1) != 0 ||
2158 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2159 copy_to_user(buf + count - 1, &i, 1) != 0) {
2160 retval = (-EFAULT);
2161 goto out;
2162 }
2163 }
2164
2165 STps->rw = ST_READING;
2166
2167
2168 /* Loop until enough data in buffer or a special condition found */
2169 for (total = 0, special = 0; total < count && !special;) {
2170
2171 /* Get new data if the buffer is empty */
2172 if (STbp->buffer_bytes == 0) {
2173 special = read_tape(STp, count - total, &SRpnt);
2174 if (special < 0) { /* No need to continue read */
2175 retval = special;
2176 goto out;
2177 }
2178 }
2179
2180 /* Move the data from driver buffer to user buffer */
2181 if (STbp->buffer_bytes > 0) {
b30d8bca 2182 DEB(
1da177e4 2183 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2184 st_printk(ST_DEB_MSG, STp,
2185 "EOF up (%d). Left %d, needed %d.\n",
2186 STps->eof, STbp->buffer_bytes,
2187 (int)(count - total));
2188 ) /* end DEB */
1da177e4
LT		 2189 transfer = STbp->buffer_bytes < count - total ?
2190 STbp->buffer_bytes : count - total;
2191 if (!do_dio) {
2192 i = from_buffer(STbp, buf, transfer);
2193 if (i) {
2194 retval = i;
2195 goto out;
2196 }
2197 }
2198 buf += transfer;
2199 total += transfer;
2200 }
2201
2202 if (STp->block_size == 0)
2203 break; /* Read only one variable length block */
2204
2205 } /* for (total = 0, special = 0;
2206 total < count && !special; ) */
2207
2208 /* Change the eof state if no data from tape or buffer */
2209 if (total == 0) {
2210 if (STps->eof == ST_FM_HIT) {
2211 STps->eof = ST_FM;
2212 STps->drv_block = 0;
2213 if (STps->drv_file >= 0)
2214 STps->drv_file++;
2215 } else if (STps->eof == ST_EOD_1) {
2216 STps->eof = ST_EOD_2;
2217 STps->drv_block = 0;
2218 if (STps->drv_file >= 0)
2219 STps->drv_file++;
2220 } else if (STps->eof == ST_EOD_2)
2221 STps->eof = ST_EOD;
2222 } else if (STps->eof == ST_FM)
2223 STps->eof = ST_NOEOF;
2224 retval = total;
2225
2226 out:
2227 if (SRpnt != NULL) {
8b05b773 2228 st_release_request(SRpnt);
1da177e4
LT		 2229 SRpnt = NULL;
2230 }
2231 if (do_dio) {
787926b1 2232 release_buffering(STp, 1);
1da177e4
LT		 2233 STbp->buffer_bytes = 0;
2234 }
28f85009 2235 mutex_unlock(&STp->lock);
1da177e4
LT		 2236
2237 return retval;
2238}
2239\f
2240
2241
2242DEB(
2243/* Set the driver options */
b30d8bca 2244static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
1da177e4
LT		 2245{
2246 if (debugging) {
b30d8bca
HR		 2247 st_printk(KERN_INFO, STp,
2248 "Mode %d options: buffer writes: %d, "
2249 "async writes: %d, read ahead: %d\n",
2250 STp->current_mode, STm->do_buffer_writes,
2251 STm->do_async_writes, STm->do_read_ahead);
2252 st_printk(KERN_INFO, STp,
2253 " can bsr: %d, two FMs: %d, "
2254 "fast mteom: %d, auto lock: %d,\n",
2255 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2256 STp->do_auto_lock);
2257 st_printk(KERN_INFO, STp,
2258 " defs for wr: %d, no block limits: %d, "
2259 "partitions: %d, s2 log: %d\n",
2260 STm->defaults_for_writes, STp->omit_blklims,
2261 STp->can_partitions, STp->scsi2_logical);
2262 st_printk(KERN_INFO, STp,
2263 " sysv: %d nowait: %d sili: %d "
2264 "nowait_filemark: %d\n",
2265 STm->sysv, STp->immediate, STp->sili,
2266 STp->immediate_filemark);
2267 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
1da177e4
LT		 2268 }
2269}
2270 )
2271
2272
2273static int st_set_options(struct scsi_tape *STp, long options)
2274{
2275 int value;
2276 long code;
2277 struct st_modedef *STm;
1da177e4 2278 struct cdev *cd0, *cd1;
d6216c47 2279 struct device *d0, *d1;
1da177e4
LT		 2280
2281 STm = &(STp->modes[STp->current_mode]);
2282 if (!STm->defined) {
d6216c47
ML		 2283 cd0 = STm->cdevs[0];
2284 cd1 = STm->cdevs[1];
2285 d0 = STm->devs[0];
2286 d1 = STm->devs[1];
1da177e4 2287 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
d6216c47
ML		 2288 STm->cdevs[0] = cd0;
2289 STm->cdevs[1] = cd1;
2290 STm->devs[0] = d0;
2291 STm->devs[1] = d1;
1da177e4 2292 modes_defined = 1;
b30d8bca
HR		 2293 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2294 STp->current_mode);
1da177e4
LT		 2295 }
2296
2297 code = options & MT_ST_OPTIONS;
2298 if (code == MT_ST_BOOLEANS) {
2299 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2300 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2301 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2302 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2303 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2304 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2305 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2306 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2307 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2308 if ((STp->device)->scsi_level >= SCSI_2)
2309 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2310 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2311 STp->immediate = (options & MT_ST_NOWAIT) != 0;
c743e44f 2312 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
1da177e4 2313 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2314 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4 2315 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
b30d8bca 2316 st_log_options(STp, STm); )
1da177e4
LT		 2317 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2318 value = (code == MT_ST_SETBOOLEANS);
2319 if ((options & MT_ST_BUFFER_WRITES) != 0)
2320 STm->do_buffer_writes = value;
2321 if ((options & MT_ST_ASYNC_WRITES) != 0)
2322 STm->do_async_writes = value;
2323 if ((options & MT_ST_DEF_WRITES) != 0)
2324 STm->defaults_for_writes = value;
2325 if ((options & MT_ST_READ_AHEAD) != 0)
2326 STm->do_read_ahead = value;
2327 if ((options & MT_ST_TWO_FM) != 0)
2328 STp->two_fm = value;
2329 if ((options & MT_ST_FAST_MTEOM) != 0)
2330 STp->fast_mteom = value;
2331 if ((options & MT_ST_AUTO_LOCK) != 0)
2332 STp->do_auto_lock = value;
2333 if ((options & MT_ST_CAN_BSR) != 0)
2334 STp->can_bsr = value;
2335 if ((options & MT_ST_NO_BLKLIMS) != 0)
2336 STp->omit_blklims = value;
2337 if ((STp->device)->scsi_level >= SCSI_2 &&
2338 (options & MT_ST_CAN_PARTITIONS) != 0)
2339 STp->can_partitions = value;
2340 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2341 STp->scsi2_logical = value;
2342 if ((options & MT_ST_NOWAIT) != 0)
2343 STp->immediate = value;
c743e44f
LD		 2344 if ((options & MT_ST_NOWAIT_EOF) != 0)
2345 STp->immediate_filemark = value;
1da177e4
LT		 2346 if ((options & MT_ST_SYSV) != 0)
2347 STm->sysv = value;
40f6b36c
KM		 2348 if ((options & MT_ST_SILI) != 0)
2349 STp->sili = value;
b30d8bca 2350 DEB(
1da177e4
LT		 2351 if ((options & MT_ST_DEBUGGING) != 0)
2352 debugging = value;
b30d8bca 2353 st_log_options(STp, STm); )
1da177e4
LT		 2354 } else if (code == MT_ST_WRITE_THRESHOLD) {
2355 /* Retained for compatibility */
2356 } else if (code == MT_ST_DEF_BLKSIZE) {
2357 value = (options & ~MT_ST_OPTIONS);
2358 if (value == ~MT_ST_OPTIONS) {
2359 STm->default_blksize = (-1);
b30d8bca 2360 DEBC_printk(STp, "Default block size disabled.\n");
1da177e4
LT		 2361 } else {
2362 STm->default_blksize = value;
b30d8bca
HR		 2363 DEBC_printk(STp,"Default block size set to "
2364 "%d bytes.\n", STm->default_blksize);
1da177e4
LT		 2365 if (STp->ready == ST_READY) {
2366 STp->blksize_changed = 0;
2367 set_mode_densblk(STp, STm);
2368 }
2369 }
2370 } else if (code == MT_ST_TIMEOUTS) {
2371 value = (options & ~MT_ST_OPTIONS);
2372 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2373 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
b30d8bca
HR		 2374 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2375 (value & ~MT_ST_SET_LONG_TIMEOUT));
1da177e4 2376 } else {
a02488ed
JB		 2377 blk_queue_rq_timeout(STp->device->request_queue,
2378 value * HZ);
b30d8bca
HR		 2379 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2380 value);
1da177e4
LT		 2381 }
2382 } else if (code == MT_ST_SET_CLN) {
2383 value = (options & ~MT_ST_OPTIONS) & 0xff;
2384 if (value != 0 &&
832151f4
RK		 2385 (value < EXTENDED_SENSE_START ||
2386 value >= SCSI_SENSE_BUFFERSIZE))
1da177e4
LT		 2387 return (-EINVAL);
2388 STp->cln_mode = value;
2389 STp->cln_sense_mask = (options >> 8) & 0xff;
2390 STp->cln_sense_value = (options >> 16) & 0xff;
b30d8bca
HR		 2391 st_printk(KERN_INFO, STp,
2392 "Cleaning request mode %d, mask %02x, value %02x\n",
2393 value, STp->cln_sense_mask, STp->cln_sense_value);
1da177e4
LT		 2394 } else if (code == MT_ST_DEF_OPTIONS) {
2395 code = (options & ~MT_ST_CLEAR_DEFAULT);
2396 value = (options & MT_ST_CLEAR_DEFAULT);
2397 if (code == MT_ST_DEF_DENSITY) {
2398 if (value == MT_ST_CLEAR_DEFAULT) {
2399 STm->default_density = (-1);
b30d8bca
HR		 2400 DEBC_printk(STp,
2401 "Density default disabled.\n");
1da177e4
LT		 2402 } else {
2403 STm->default_density = value & 0xff;
b30d8bca
HR		 2404 DEBC_printk(STp, "Density default set to %x\n",
2405 STm->default_density);
1da177e4
LT		 2406 if (STp->ready == ST_READY) {
2407 STp->density_changed = 0;
2408 set_mode_densblk(STp, STm);
2409 }
2410 }
2411 } else if (code == MT_ST_DEF_DRVBUFFER) {
2412 if (value == MT_ST_CLEAR_DEFAULT) {
2413 STp->default_drvbuffer = 0xff;
b30d8bca
HR		 2414 DEBC_printk(STp,
2415 "Drive buffer default disabled.\n");
1da177e4
LT		 2416 } else {
2417 STp->default_drvbuffer = value & 7;
b30d8bca
HR		 2418 DEBC_printk(STp,
2419 "Drive buffer default set to %x\n",
2420 STp->default_drvbuffer);
1da177e4
LT		 2421 if (STp->ready == ST_READY)
2422 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2423 }
2424 } else if (code == MT_ST_DEF_COMPRESSION) {
2425 if (value == MT_ST_CLEAR_DEFAULT) {
2426 STm->default_compression = ST_DONT_TOUCH;
b30d8bca
HR		 2427 DEBC_printk(STp,
2428 "Compression default disabled.\n");
1da177e4
LT		 2429 } else {
2430 if ((value & 0xff00) != 0) {
2431 STp->c_algo = (value & 0xff00) >> 8;
b30d8bca
HR		 2432 DEBC_printk(STp, "Compression "
2433 "algorithm set to 0x%x.\n",
2434 STp->c_algo);
1da177e4
LT		 2435 }
2436 if ((value & 0xff) != 0xff) {
2437 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
b30d8bca
HR		 2438 DEBC_printk(STp, "Compression default "
2439 "set to %x\n",
2440 (value & 1));
1da177e4
LT		 2441 if (STp->ready == ST_READY) {
2442 STp->compression_changed = 0;
2443 st_compression(STp, (STm->default_compression == ST_YES));
2444 }
2445 }
2446 }
2447 }
2448 } else
2449 return (-EIO);
2450
2451 return 0;
2452}
2453\f
2454#define MODE_HEADER_LENGTH 4
2455
2456/* Mode header and page byte offsets */
2457#define MH_OFF_DATA_LENGTH 0
2458#define MH_OFF_MEDIUM_TYPE 1
2459#define MH_OFF_DEV_SPECIFIC 2
2460#define MH_OFF_BDESCS_LENGTH 3
2461#define MP_OFF_PAGE_NBR 0
2462#define MP_OFF_PAGE_LENGTH 1
2463
2464/* Mode header and page bit masks */
2465#define MH_BIT_WP 0x80
2466#define MP_MSK_PAGE_NBR 0x3f
2467
2468/* Don't return block descriptors */
2469#define MODE_SENSE_OMIT_BDESCS 0x08
2470
2471#define MODE_SELECT_PAGE_FORMAT 0x10
2472
2473/* Read a mode page into the tape buffer. The block descriptors are included
2474 if incl_block_descs is true. The page control is ored to the page number
2475 parameter, if necessary. */
2476static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2477{
2478 unsigned char cmd[MAX_COMMAND_SIZE];
8ecf0d99 2479 struct st_request *SRpnt;
1da177e4
LT		 2480
2481 memset(cmd, 0, MAX_COMMAND_SIZE);
2482 cmd[0] = MODE_SENSE;
2483 if (omit_block_descs)
2484 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2485 cmd[2] = page;
2486 cmd[4] = 255;
2487
02ae2c0e
KM		 2488 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2489 STp->device->request_queue->rq_timeout, 0, 1);
2490 if (SRpnt == NULL)
2491 return (STp->buffer)->syscall_result;
1da177e4 2492
8b05b773 2493 st_release_request(SRpnt);
1da177e4 2494
02ae2c0e 2495 return STp->buffer->syscall_result;
1da177e4
LT		 2496}
2497
2498
2499/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2500 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2501static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2502{
02ae2c0e 2503 int pgo;
1da177e4 2504 unsigned char cmd[MAX_COMMAND_SIZE];
18c87015 2505 struct st_request *SRpnt;
02ae2c0e 2506 int timeout;
1da177e4
LT		 2507
2508 memset(cmd, 0, MAX_COMMAND_SIZE);
2509 cmd[0] = MODE_SELECT;
2510 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2511 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2512 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2513
2514 /* Clear reserved fields */
2515 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2516 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2517 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2518 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2519
02ae2c0e
KM		 2520 timeout = slow ?
2521 STp->long_timeout : STp->device->request_queue->rq_timeout;
2522 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2523 timeout, 0, 1);
2524 if (SRpnt == NULL)
2525 return (STp->buffer)->syscall_result;
1da177e4 2526
8b05b773 2527 st_release_request(SRpnt);
1da177e4 2528
02ae2c0e 2529 return STp->buffer->syscall_result;
1da177e4
LT		 2530}
2531
2532
2533#define COMPRESSION_PAGE 0x0f
2534#define COMPRESSION_PAGE_LENGTH 16
2535
2536#define CP_OFF_DCE_DCC 2
2537#define CP_OFF_C_ALGO 7
2538
2539#define DCE_MASK 0x80
2540#define DCC_MASK 0x40
2541#define RED_MASK 0x60
2542
2543
2544/* Control the compression with mode page 15. Algorithm not changed if zero.
2545
2546 The block descriptors are read and written because Sony SDT-7000 does not
2547 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2548 Including block descriptors should not cause any harm to other drives. */
2549
2550static int st_compression(struct scsi_tape * STp, int state)
2551{
2552 int retval;
2553 int mpoffs; /* Offset to mode page start */
2554 unsigned char *b_data = (STp->buffer)->b_data;
1da177e4
LT		 2555
2556 if (STp->ready != ST_READY)
2557 return (-EIO);
2558
2559 /* Read the current page contents */
2560 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2561 if (retval) {
b30d8bca 2562 DEBC_printk(STp, "Compression mode page not supported.\n");
1da177e4
LT		 2563 return (-EIO);
2564 }
2565
2566 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 2567 DEBC_printk(STp, "Compression state is %d.\n",
2568 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
1da177e4
LT		 2569
2570 /* Check if compression can be changed */
2571 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
b30d8bca 2572 DEBC_printk(STp, "Compression not supported.\n");
1da177e4
LT		 2573 return (-EIO);
2574 }
2575
2576 /* Do the change */
2577 if (state) {
2578 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2579 if (STp->c_algo != 0)
2580 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2581 }
2582 else {
2583 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2584 if (STp->c_algo != 0)
2585 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2586 }
2587
2588 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2589 if (retval) {
b30d8bca 2590 DEBC_printk(STp, "Compression change failed.\n");
1da177e4
LT		 2591 return (-EIO);
2592 }
b30d8bca 2593 DEBC_printk(STp, "Compression state changed to %d.\n", state);
1da177e4
LT		 2594
2595 STp->compression_changed = 1;
2596 return 0;
2597}
2598
2599
2600/* Process the load and unload commands (does unload if the load code is zero) */
2601static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2602{
2603 int retval = (-EIO), timeout;
1da177e4
LT		 2604 unsigned char cmd[MAX_COMMAND_SIZE];
2605 struct st_partstat *STps;
8b05b773 2606 struct st_request *SRpnt;
1da177e4
LT		 2607
2608 if (STp->ready != ST_READY && !load_code) {
2609 if (STp->ready == ST_NO_TAPE)
2610 return (-ENOMEDIUM);
2611 else
2612 return (-EIO);
2613 }
2614
2615 memset(cmd, 0, MAX_COMMAND_SIZE);
2616 cmd[0] = START_STOP;
2617 if (load_code)
2618 cmd[4] |= 1;
2619 /*
2620 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2621 */
2622 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2623 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
b30d8bca
HR		 2624 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2625 (cmd[4]) ? "" : "un",
2626 load_code - MT_ST_HPLOADER_OFFSET);
1da177e4
LT		 2627 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2628 }
2629 if (STp->immediate) {
2630 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2631 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2632 }
2633 else
2634 timeout = STp->long_timeout;
2635
2636 DEBC(
2637 if (!load_code)
b30d8bca 2638 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
1da177e4 2639 else
b30d8bca 2640 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
1da177e4
LT		 2641 );
2642
02ae2c0e
KM		 2643 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2644 timeout, MAX_RETRIES, 1);
1da177e4 2645 if (!SRpnt)
02ae2c0e 2646 return (STp->buffer)->syscall_result;
1da177e4
LT		 2647
2648 retval = (STp->buffer)->syscall_result;
02ae2c0e 2649 st_release_request(SRpnt);
1da177e4
LT		 2650
2651 if (!retval) { /* SCSI command successful */
2652
2653 if (!load_code) {
2654 STp->rew_at_close = 0;
2655 STp->ready = ST_NO_TAPE;
2656 }
2657 else {
2658 STp->rew_at_close = STp->autorew_dev;
2659 retval = check_tape(STp, filp);
2660 if (retval > 0)
2661 retval = 0;
2662 }
2663 }
2664 else {
2665 STps = &(STp->ps[STp->partition]);
2666 STps->drv_file = STps->drv_block = (-1);
2667 }
2668
2669 return retval;
2670}
2671\f
2672#if DEBUG
2673#define ST_DEB_FORWARD 0
2674#define ST_DEB_BACKWARD 1
b30d8bca 2675static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
1da177e4
LT		 2676{
2677 s32 sc;
2678
b30d8bca
HR		 2679 if (!debugging)
2680 return;
2681
35b703db 2682 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
1da177e4
LT		 2683 if (direction)
2684 sc = -sc;
b30d8bca
HR		 2685 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2686 direction ? "backward" : "forward", sc, units);
1da177e4 2687}
b30d8bca
HR		 2688#else
2689#define ST_DEB_FORWARD 0
2690#define ST_DEB_BACKWARD 1
2691static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2692#endif
2693
2694
2695/* Internal ioctl function */
2696static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2697{
2698 int timeout;
2699 long ltmp;
2700 int ioctl_result;
2701 int chg_eof = 1;
2702 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2703 struct st_request *SRpnt;
1da177e4
LT		 2704 struct st_partstat *STps;
2705 int fileno, blkno, at_sm, undone;
2706 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2707
2708 WARN_ON(STp->buffer->do_dio != 0);
2709 if (STp->ready != ST_READY) {
2710 if (STp->ready == ST_NO_TAPE)
2711 return (-ENOMEDIUM);
2712 else
2713 return (-EIO);
2714 }
2715 timeout = STp->long_timeout;
2716 STps = &(STp->ps[STp->partition]);
2717 fileno = STps->drv_file;
2718 blkno = STps->drv_block;
2719 at_sm = STps->at_sm;
2720
2721 memset(cmd, 0, MAX_COMMAND_SIZE);
2722 switch (cmd_in) {
2723 case MTFSFM:
2724 chg_eof = 0; /* Changed from the FSF after this */
df561f66 2725 fallthrough;
1da177e4
LT		 2726 case MTFSF:
2727 cmd[0] = SPACE;
2728 cmd[1] = 0x01; /* Space FileMarks */
2729 cmd[2] = (arg >> 16);
2730 cmd[3] = (arg >> 8);
2731 cmd[4] = arg;
b30d8bca 2732 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2733 if (fileno >= 0)
2734 fileno += arg;
2735 blkno = 0;
2736 at_sm &= (arg == 0);
2737 break;
2738 case MTBSFM:
2739 chg_eof = 0; /* Changed from the FSF after this */
df561f66 2740 fallthrough;
1da177e4
LT		 2741 case MTBSF:
2742 cmd[0] = SPACE;
2743 cmd[1] = 0x01; /* Space FileMarks */
2744 ltmp = (-arg);
2745 cmd[2] = (ltmp >> 16);
2746 cmd[3] = (ltmp >> 8);
2747 cmd[4] = ltmp;
b30d8bca 2748 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2749 if (fileno >= 0)
2750 fileno -= arg;
2751 blkno = (-1); /* We can't know the block number */
2752 at_sm &= (arg == 0);
2753 break;
2754 case MTFSR:
2755 cmd[0] = SPACE;
2756 cmd[1] = 0x00; /* Space Blocks */
2757 cmd[2] = (arg >> 16);
2758 cmd[3] = (arg >> 8);
2759 cmd[4] = arg;
b30d8bca 2760 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2761 if (blkno >= 0)
2762 blkno += arg;
2763 at_sm &= (arg == 0);
2764 break;
2765 case MTBSR:
2766 cmd[0] = SPACE;
2767 cmd[1] = 0x00; /* Space Blocks */
2768 ltmp = (-arg);
2769 cmd[2] = (ltmp >> 16);
2770 cmd[3] = (ltmp >> 8);
2771 cmd[4] = ltmp;
b30d8bca 2772 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2773 if (blkno >= 0)
2774 blkno -= arg;
2775 at_sm &= (arg == 0);
2776 break;
2777 case MTFSS:
2778 cmd[0] = SPACE;
2779 cmd[1] = 0x04; /* Space Setmarks */
2780 cmd[2] = (arg >> 16);
2781 cmd[3] = (arg >> 8);
2782 cmd[4] = arg;
b30d8bca 2783 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2784 if (arg != 0) {
2785 blkno = fileno = (-1);
2786 at_sm = 1;
2787 }
2788 break;
2789 case MTBSS:
2790 cmd[0] = SPACE;
2791 cmd[1] = 0x04; /* Space Setmarks */
2792 ltmp = (-arg);
2793 cmd[2] = (ltmp >> 16);
2794 cmd[3] = (ltmp >> 8);
2795 cmd[4] = ltmp;
b30d8bca 2796 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2797 if (arg != 0) {
2798 blkno = fileno = (-1);
2799 at_sm = 1;
2800 }
2801 break;
2802 case MTWEOF:
3e51d3c9 2803 case MTWEOFI:
1da177e4
LT		 2804 case MTWSM:
2805 if (STp->write_prot)
2806 return (-EACCES);
2807 cmd[0] = WRITE_FILEMARKS;
2808 if (cmd_in == MTWSM)
2809 cmd[1] = 2;
c743e44f
LD		 2810 if (cmd_in == MTWEOFI ||
2811 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2812 cmd[1] |= 1;
1da177e4
LT		 2813 cmd[2] = (arg >> 16);
2814 cmd[3] = (arg >> 8);
2815 cmd[4] = arg;
a02488ed 2816 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2817 DEBC(
2818 if (cmd_in != MTWSM)
2819 st_printk(ST_DEB_MSG, STp,
2820 "Writing %d filemarks.\n",
2821 cmd[2] * 65536 +
2822 cmd[3] * 256 +
2823 cmd[4]);
2824 else
2825 st_printk(ST_DEB_MSG, STp,
2826 "Writing %d setmarks.\n",
2827 cmd[2] * 65536 +
2828 cmd[3] * 256 +
2829 cmd[4]);
1da177e4
LT		 2830 )
2831 if (fileno >= 0)
2832 fileno += arg;
2833 blkno = 0;
2834 at_sm = (cmd_in == MTWSM);
2835 break;
2836 case MTREW:
2837 cmd[0] = REZERO_UNIT;
2838 if (STp->immediate) {
2839 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2840 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2841 }
b30d8bca 2842 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2843 fileno = blkno = at_sm = 0;
2844 break;
2845 case MTNOP:
b30d8bca 2846 DEBC_printk(STp, "No op on tape.\n");
1da177e4 2847 return 0; /* Should do something ? */
1da177e4
LT		 2848 case MTRETEN:
2849 cmd[0] = START_STOP;
2850 if (STp->immediate) {
2851 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2852 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2853 }
2854 cmd[4] = 3;
b30d8bca 2855 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2856 fileno = blkno = at_sm = 0;
2857 break;
2858 case MTEOM:
2859 if (!STp->fast_mteom) {
2860 /* space to the end of tape */
2861 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2862 fileno = STps->drv_file;
2863 if (STps->eof >= ST_EOD_1)
2864 return 0;
2865 /* The next lines would hide the number of spaced FileMarks
2866 That's why I inserted the previous lines. I had no luck
2867 with detecting EOM with FSF, so we go now to EOM.
2868 Joerg Weule */
2869 } else
2870 fileno = (-1);
2871 cmd[0] = SPACE;
2872 cmd[1] = 3;
b30d8bca 2873 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2874 blkno = -1;
2875 at_sm = 0;
2876 break;
2877 case MTERASE:
2878 if (STp->write_prot)
2879 return (-EACCES);
2880 cmd[0] = ERASE;
2881 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2882 if (STp->immediate) {
2883 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2884 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2885 }
2886 else
2887 timeout = STp->long_timeout * 8;
2888
b30d8bca 2889 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2890 fileno = blkno = at_sm = 0;
2891 break;
2892 case MTSETBLK: /* Set block length */
2893 case MTSETDENSITY: /* Set tape density */
2894 case MTSETDRVBUFFER: /* Set drive buffering */
2895 case SET_DENS_AND_BLK: /* Set density and block size */
2896 chg_eof = 0;
2897 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2898 return (-EIO); /* Not allowed if data in buffer */
2899 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2900 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2901 STp->max_block > 0 &&
2902 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2903 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2904 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2905 return (-EINVAL);
2906 }
2907 cmd[0] = MODE_SELECT;
2908 if ((STp->use_pf & USE_PF))
2909 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2910 cmd[4] = datalen = 12;
2911 direction = DMA_TO_DEVICE;
2912
2913 memset((STp->buffer)->b_data, 0, 12);
2914 if (cmd_in == MTSETDRVBUFFER)
2915 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2916 else
2917 (STp->buffer)->b_data[2] =
2918 STp->drv_buffer << 4;
2919 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2920 if (cmd_in == MTSETDENSITY) {
2921 (STp->buffer)->b_data[4] = arg;
2922 STp->density_changed = 1; /* At least we tried ;-) */
2923 } else if (cmd_in == SET_DENS_AND_BLK)
2924 (STp->buffer)->b_data[4] = arg >> 24;
2925 else
2926 (STp->buffer)->b_data[4] = STp->density;
2927 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2928 ltmp = arg & MT_ST_BLKSIZE_MASK;
2929 if (cmd_in == MTSETBLK)
2930 STp->blksize_changed = 1; /* At least we tried ;-) */
2931 } else
2932 ltmp = STp->block_size;
2933 (STp->buffer)->b_data[9] = (ltmp >> 16);
2934 (STp->buffer)->b_data[10] = (ltmp >> 8);
2935 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2936 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2937 DEBC(
1da177e4 2938 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2939 st_printk(ST_DEB_MSG, STp,
2940 "Setting block size to %d bytes.\n",
2941 (STp->buffer)->b_data[9] * 65536 +
2942 (STp->buffer)->b_data[10] * 256 +
2943 (STp->buffer)->b_data[11]);
1da177e4 2944 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2945 st_printk(ST_DEB_MSG, STp,
2946 "Setting density code to %x.\n",
2947 (STp->buffer)->b_data[4]);
1da177e4 2948 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2949 st_printk(ST_DEB_MSG, STp,
2950 "Setting drive buffer code to %d.\n",
2951 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2952 )
2953 break;
2954 default:
2955 return (-ENOSYS);
2956 }
2957
02ae2c0e
KM		 2958 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2959 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2960 if (!SRpnt)
2961 return (STp->buffer)->syscall_result;
2962
02ae2c0e 2963 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2964
2965 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2966 st_release_request(SRpnt);
1da177e4
LT		 2967 SRpnt = NULL;
2968 STps->drv_block = blkno;
2969 STps->drv_file = fileno;
2970 STps->at_sm = at_sm;
2971
2972 if (cmd_in == MTBSFM)
2973 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2974 else if (cmd_in == MTFSFM)
2975 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2976
2977 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2978 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2979 if (STp->block_size != 0) {
1da177e4
LT		 2980 (STp->buffer)->buffer_blocks =
2981 (STp->buffer)->buffer_size / STp->block_size;
2982 }
2983 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2984 if (cmd_in == SET_DENS_AND_BLK)
2985 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2986 } else if (cmd_in == MTSETDRVBUFFER)
2987 STp->drv_buffer = (arg & 7);
2988 else if (cmd_in == MTSETDENSITY)
2989 STp->density = arg;
2990
2991 if (cmd_in == MTEOM)
2992 STps->eof = ST_EOD;
2993 else if (cmd_in == MTFSF)
2994 STps->eof = ST_FM;
2995 else if (chg_eof)
2996 STps->eof = ST_NOEOF;
2997
3e51d3c9
KM		 2998 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2999 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 3000 } else { /* SCSI command was not completely successful. Don't return
3001 from this block without releasing the SCSI command block! */
3002 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3003
3004 if (cmdstatp->flags & SENSE_EOM) {
3005 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3006 cmd_in != MTBSR && cmd_in != MTBSS)
3007 STps->eof = ST_EOM_OK;
3008 STps->drv_block = 0;
3009 }
3010
3011 if (cmdstatp->remainder_valid)
3012 undone = (int)cmdstatp->uremainder64;
3013 else
3014 undone = 0;
3015
3e51d3c9 3016 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3017 cmdstatp->have_sense &&
91614c05
KM		 3018 (cmdstatp->flags & SENSE_EOM)) {
3019 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3020 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3021 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3022 STps->eof = ST_NOEOF;
3023 } else { /* Writing EOF(s) failed */
3024 if (fileno >= 0)
3025 fileno -= undone;
3026 if (undone < arg)
3027 STps->eof = ST_NOEOF;
3028 }
1da177e4 3029 STps->drv_file = fileno;
1da177e4
LT		 3030 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3031 if (fileno >= 0)
3032 STps->drv_file = fileno - undone;
3033 else
3034 STps->drv_file = fileno;
3035 STps->drv_block = -1;
3036 STps->eof = ST_NOEOF;
3037 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3038 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3039 undone = (-undone);
3040 if (STps->drv_file >= 0)
3041 STps->drv_file = fileno + undone;
3042 STps->drv_block = 0;
3043 STps->eof = ST_NOEOF;
3044 } else if (cmd_in == MTFSR) {
3045 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3046 if (STps->drv_file >= 0)
3047 STps->drv_file++;
3048 STps->drv_block = 0;
3049 STps->eof = ST_FM;
3050 } else {
3051 if (blkno >= undone)
3052 STps->drv_block = blkno - undone;
3053 else
3054 STps->drv_block = (-1);
3055 STps->eof = ST_NOEOF;
3056 }
3057 } else if (cmd_in == MTBSR) {
3058 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3059 STps->drv_file--;
3060 STps->drv_block = (-1);
3061 } else {
3062 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3063 undone = (-undone);
3064 if (STps->drv_block >= 0)
3065 STps->drv_block = blkno + undone;
3066 }
3067 STps->eof = ST_NOEOF;
3068 } else if (cmd_in == MTEOM) {
3069 STps->drv_file = (-1);
3070 STps->drv_block = (-1);
3071 STps->eof = ST_EOD;
3072 } else if (cmd_in == MTSETBLK ||
3073 cmd_in == MTSETDENSITY ||
3074 cmd_in == MTSETDRVBUFFER ||
3075 cmd_in == SET_DENS_AND_BLK) {
3076 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3077 !(STp->use_pf & PF_TESTED)) {
3078 /* Try the other possible state of Page Format if not
3079 already tried */
1da2019f 3080 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3081 st_release_request(SRpnt);
1da177e4
LT		 3082 SRpnt = NULL;
3083 return st_int_ioctl(STp, cmd_in, arg);
3084 }
3085 } else if (chg_eof)
3086 STps->eof = ST_NOEOF;
3087
3088 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3089 STps->eof = ST_EOD;
3090
8b05b773 3091 st_release_request(SRpnt);
1da177e4
LT		 3092 SRpnt = NULL;
3093 }
3094
3095 return ioctl_result;
3096}
3097\f
3098
3099/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3100 structure. */
3101
3102static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3103 int logical)
3104{
3105 int result;
3106 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3107 struct st_request *SRpnt;
1da177e4
LT		 3108
3109 if (STp->ready != ST_READY)
3110 return (-EIO);
3111
3112 memset(scmd, 0, MAX_COMMAND_SIZE);
3113 if ((STp->device)->scsi_level < SCSI_2) {
3114 scmd[0] = QFA_REQUEST_BLOCK;
3115 scmd[4] = 3;
3116 } else {
3117 scmd[0] = READ_POSITION;
3118 if (!logical && !STp->scsi2_logical)
3119 scmd[1] = 1;
3120 }
02ae2c0e
KM		 3121 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3122 STp->device->request_queue->rq_timeout,
3123 MAX_READY_RETRIES, 1);
1da177e4 3124 if (!SRpnt)
02ae2c0e 3125 return (STp->buffer)->syscall_result;
1da177e4
LT		 3126
3127 if ((STp->buffer)->syscall_result != 0 ||
3128 (STp->device->scsi_level >= SCSI_2 &&
3129 ((STp->buffer)->b_data[0] & 4) != 0)) {
3130 *block = *partition = 0;
b30d8bca 3131 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3132 result = (-EIO);
3133 } else {
3134 result = 0;
3135 if ((STp->device)->scsi_level < SCSI_2) {
3136 *block = ((STp->buffer)->b_data[0] << 16)
3137 + ((STp->buffer)->b_data[1] << 8)
3138 + (STp->buffer)->b_data[2];
3139 *partition = 0;
3140 } else {
3141 *block = ((STp->buffer)->b_data[4] << 24)
3142 + ((STp->buffer)->b_data[5] << 16)
3143 + ((STp->buffer)->b_data[6] << 8)
3144 + (STp->buffer)->b_data[7];
3145 *partition = (STp->buffer)->b_data[1];
3146 if (((STp->buffer)->b_data[0] & 0x80) &&
3147 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3148 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3149 }
b30d8bca
HR		 3150 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3151 *block, *partition);
1da177e4 3152 }
8b05b773 3153 st_release_request(SRpnt);
1da177e4
LT		 3154 SRpnt = NULL;
3155
3156 return result;
3157}
3158
3159
3160/* Set the tape block and partition. Negative partition means that only the
3161 block should be set in vendor specific way. */
3162static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3163 int logical)
3164{
3165 struct st_partstat *STps;
3166 int result, p;
3167 unsigned int blk;
3168 int timeout;
3169 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3170 struct st_request *SRpnt;
1da177e4
LT		 3171
3172 if (STp->ready != ST_READY)
3173 return (-EIO);
3174 timeout = STp->long_timeout;
3175 STps = &(STp->ps[STp->partition]);
3176
b30d8bca
HR		 3177 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3178 block, partition);
1da177e4
LT		 3179 DEB(if (partition < 0)
3180 return (-EIO); )
3181
3182 /* Update the location at the partition we are leaving */
3183 if ((!STp->can_partitions && partition != 0) ||
3184 partition >= ST_NBR_PARTITIONS)
3185 return (-EINVAL);
3186 if (partition != STp->partition) {
3187 if (get_location(STp, &blk, &p, 1))
3188 STps->last_block_valid = 0;
3189 else {
3190 STps->last_block_valid = 1;
3191 STps->last_block_visited = blk;
b30d8bca
HR		 3192 DEBC_printk(STp, "Visited block %d for "
3193 "partition %d saved.\n",
3194 blk, STp->partition);
1da177e4
LT		 3195 }
3196 }
3197
3198 memset(scmd, 0, MAX_COMMAND_SIZE);
3199 if ((STp->device)->scsi_level < SCSI_2) {
3200 scmd[0] = QFA_SEEK_BLOCK;
3201 scmd[2] = (block >> 16);
3202 scmd[3] = (block >> 8);
3203 scmd[4] = block;
3204 scmd[5] = 0;
3205 } else {
3206 scmd[0] = SEEK_10;
3207 scmd[3] = (block >> 24);
3208 scmd[4] = (block >> 16);
3209 scmd[5] = (block >> 8);
3210 scmd[6] = block;
3211 if (!logical && !STp->scsi2_logical)
3212 scmd[1] = 4;
3213 if (STp->partition != partition) {
3214 scmd[1] |= 2;
3215 scmd[8] = partition;
b30d8bca
HR		 3216 DEBC_printk(STp, "Trying to change partition "
3217 "from %d to %d\n", STp->partition,
3218 partition);
1da177e4
LT		 3219 }
3220 }
3221 if (STp->immediate) {
3222 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3223 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3224 }
3225
02ae2c0e
KM		 3226 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3227 timeout, MAX_READY_RETRIES, 1);
1da177e4 3228 if (!SRpnt)
02ae2c0e 3229 return (STp->buffer)->syscall_result;
1da177e4
LT		 3230
3231 STps->drv_block = STps->drv_file = (-1);
3232 STps->eof = ST_NOEOF;
3233 if ((STp->buffer)->syscall_result != 0) {
3234 result = (-EIO);
3235 if (STp->can_partitions &&
3236 (STp->device)->scsi_level >= SCSI_2 &&
3237 (p = find_partition(STp)) >= 0)
3238 STp->partition = p;
3239 } else {
3240 if (STp->can_partitions) {
3241 STp->partition = partition;
3242 STps = &(STp->ps[partition]);
3243 if (!STps->last_block_valid ||
3244 STps->last_block_visited != block) {
3245 STps->at_sm = 0;
3246 STps->rw = ST_IDLE;
3247 }
3248 } else
3249 STps->at_sm = 0;
3250 if (block == 0)
3251 STps->drv_block = STps->drv_file = 0;
3252 result = 0;
3253 }
02ae2c0e 3254
8b05b773 3255 st_release_request(SRpnt);
1da177e4
LT		 3256 SRpnt = NULL;
3257
3258 return result;
3259}
3260
3261
3262/* Find the current partition number for the drive status. Called from open and
3263 returns either partition number of negative error code. */
3264static int find_partition(struct scsi_tape *STp)
3265{
3266 int i, partition;
3267 unsigned int block;
3268
3269 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3270 return i;
3271 if (partition >= ST_NBR_PARTITIONS)
3272 return (-EIO);
3273 return partition;
3274}
3275
3276
3277/* Change the partition if necessary */
3278static int switch_partition(struct scsi_tape *STp)
3279{
3280 struct st_partstat *STps;
3281
3282 if (STp->partition == STp->new_partition)
3283 return 0;
3284 STps = &(STp->ps[STp->new_partition]);
3285 if (!STps->last_block_valid)
3286 STps->last_block_visited = 0;
3287 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3288}
3289\f
3290/* Functions for reading and writing the medium partition mode page. */
3291
3292#define PART_PAGE 0x11
3293#define PART_PAGE_FIXED_LENGTH 8
3294
3295#define PP_OFF_MAX_ADD_PARTS 2
3296#define PP_OFF_NBR_ADD_PARTS 3
3297#define PP_OFF_FLAGS 4
3298#define PP_OFF_PART_UNITS 6
3299#define PP_OFF_RESERVED 7
3300
3301#define PP_BIT_IDP 0x20
8038e645 3302#define PP_BIT_FDP 0x80
1da177e4 3303#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3304#define PP_MSK_PSUM_UNITS 0x18
3305#define PP_MSK_POFM 0x04
1da177e4
LT		 3306
3307/* Get the number of partitions on the tape. As a side effect reads the
3308 mode page into the tape buffer. */
3309static int nbr_partitions(struct scsi_tape *STp)
3310{
3311 int result;
1da177e4
LT		 3312
3313 if (STp->ready != ST_READY)
3314 return (-EIO);
3315
3316 result = read_mode_page(STp, PART_PAGE, 1);
3317
3318 if (result) {
b30d8bca 3319 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3320 result = (-EIO);
3321 } else {
3322 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3323 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3324 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3325 }
3326
3327 return result;
3328}
3329
3330
8038e645
KM		 3331static int format_medium(struct scsi_tape *STp, int format)
3332{
3333 int result = 0;
3334 int timeout = STp->long_timeout;
3335 unsigned char scmd[MAX_COMMAND_SIZE];
3336 struct st_request *SRpnt;
3337
3338 memset(scmd, 0, MAX_COMMAND_SIZE);
3339 scmd[0] = FORMAT_UNIT;
3340 scmd[2] = format;
3341 if (STp->immediate) {
3342 scmd[1] |= 1; /* Don't wait for completion */
3343 timeout = STp->device->request_queue->rq_timeout;
3344 }
3345 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3346 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3347 timeout, MAX_RETRIES, 1);
3348 if (!SRpnt)
3349 result = STp->buffer->syscall_result;
3350 return result;
3351}
3352
3353
1da177e4
LT		 3354/* Partition the tape into two partitions if size > 0 or one partition if
3355 size == 0.
3356
3357 The block descriptors are read and written because Sony SDT-7000 does not
3358 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3359
3360 My HP C1533A drive returns only one partition size field. This is used to
3361 set the size of partition 1. There is no size field for the default partition.
3362 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3363 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3364 The following algorithm is used to accommodate both drives: if the number of
3365 partition size fields is greater than the maximum number of additional partitions
3366 in the mode page, the second field is used. Otherwise the first field is used.
3367
3368 For Seagate DDS drives the page length must be 8 when no partitions is defined
3369 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3370 is acceptable also to some other old drives and enforced if the first partition
3371 size field is used for the first additional partition size.
8038e645
KM		 3372
3373 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3374 */
3375static int partition_tape(struct scsi_tape *STp, int size)
3376{
1da177e4 3377 int result;
8038e645
KM		 3378 int target_partition;
3379 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3380 int pgo, psd_cnt, psdo;
8038e645 3381 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3382 unsigned char *bp;
3383
3384 result = read_mode_page(STp, PART_PAGE, 0);
3385 if (result) {
b30d8bca 3386 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3387 return result;
3388 }
8038e645
KM		 3389 target_partition = 1;
3390 if (size < 0) {
3391 target_partition = 0;
3392 size = -size;
3393 }
3394
1da177e4
LT		 3395 /* The mode page is in the buffer. Let's modify it and write it. */
3396 bp = (STp->buffer)->b_data;
3397 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3398 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3399 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3400
3401 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3402
3403 if (scsi3) {
3404 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3405 if (needs_format && size == 0) {
3406 /* No need to write the mode page when clearing
3407 * partitioning
3408 */
3409 DEBC_printk(STp, "Formatting tape with one partition.\n");
3410 result = format_medium(STp, 0);
3411 goto out;
3412 }
3413 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3414 psd_cnt = 2;
3415 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3416 /* Use units scaling for large partitions if the device
3417 * suggests it and no precision lost. Required for IBM
3418 * TS1140/50 drives that don't support MB units.
3419 */
3420 if (size >= 1000 && (size % 1000) == 0) {
3421 size /= 1000;
3422 psum = PP_MSK_PSUM_UNITS;
3423 units = 9; /* GB */
3424 }
3425 }
3426 /* Try it anyway if too large to specify in MB */
3427 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3428 size /= 1000;
3429 psum = PP_MSK_PSUM_UNITS;
3430 units = 9; /* GB */
3431 }
3432 }
3433
3434 if (size >= 65535 || /* Does not fit into two bytes */
3435 (target_partition == 0 && psd_cnt < 2)) {
3436 result = -EINVAL;
3437 goto out;
3438 }
3439
1da177e4 3440 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3441 /* The second condition is for HP DDS which use only one partition size
3442 * descriptor
3443 */
3444 if (target_partition > 0 &&
3445 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3446 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3447 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3448 psdo += 2;
3449 }
3450 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3451
b30d8bca 3452 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3453 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3454 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3455
8038e645 3456 if (size == 0) {
1da177e4
LT		 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3458 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3459 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3460 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3461 } else {
3462 bp[psdo] = (size >> 8) & 0xff;
3463 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3464 if (target_partition == 0)
3465 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3466 bp[pgo + 3] = 1;
3467 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3468 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3469 DEBC_printk(STp,
3470 "Formatting tape with two partitions (%i = %d MB).\n",
3471 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3472 }
3473 bp[pgo + PP_OFF_PART_UNITS] = 0;
3474 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3475 if (size != 1 || units != 0) {
3476 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3477 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3478 bp[pgo + PP_OFF_PART_UNITS] = units;
3479 } else
3480 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3481 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3482 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3483
3484 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3485
3486 if (!result && needs_format)
3487 result = format_medium(STp, 1);
3488
1da177e4 3489 if (result) {
b30d8bca 3490 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3491 result = (-EIO);
3492 }
3493
8038e645 3494out:
1da177e4
LT		 3495 return result;
3496}
3497\f
3498
3499
3500/* The ioctl command */
dba7688f 3501static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4 3502{
dba7688f 3503 void __user *p = (void __user *)arg;
1da177e4
LT		 3504 int i, cmd_nr, cmd_type, bt;
3505 int retval = 0;
3506 unsigned int blk;
3507 struct scsi_tape *STp = file->private_data;
3508 struct st_modedef *STm;
3509 struct st_partstat *STps;
1da177e4 3510
28f85009 3511 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3512 return -ERESTARTSYS;
3513
b30d8bca 3514 DEB(
1da177e4 3515 if (debugging && !STp->in_use) {
b30d8bca 3516 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3517 retval = (-EIO);
3518 goto out;
3519 } ) /* end DEB */
3520
3521 STm = &(STp->modes[STp->current_mode]);
3522 STps = &(STp->ps[STp->partition]);
3523
3524 /*
3525 * If we are in the middle of error recovery, don't let anyone
3526 * else try and use this device. Also, if error recovery fails, it
3527 * may try and take the device offline, in which case all further
3528 * access to the device is prohibited.
3529 */
906d15fb
CH		 3530 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3531 file->f_flags & O_NDELAY);
3532 if (retval)
1da177e4 3533 goto out;
1da177e4
LT		 3534
3535 cmd_type = _IOC_TYPE(cmd_in);
3536 cmd_nr = _IOC_NR(cmd_in);
3537
3538 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3539 struct mtop mtc;
3540
3541 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3542 retval = (-EINVAL);
3543 goto out;
3544 }
3545
3546 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3547 if (i) {
3548 retval = (-EFAULT);
3549 goto out;
3550 }
3551
3552 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3553 st_printk(KERN_WARNING, STp,
3554 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3555 retval = (-EPERM);
3556 goto out;
3557 }
3558 if (!STm->defined &&
3559 (mtc.mt_op != MTSETDRVBUFFER &&
3560 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3561 retval = (-ENXIO);
3562 goto out;
3563 }
3564
3565 if (!STp->pos_unknown) {
3566
3567 if (STps->eof == ST_FM_HIT) {
3568 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3569 mtc.mt_op == MTEOM) {
3570 mtc.mt_count -= 1;
3571 if (STps->drv_file >= 0)
3572 STps->drv_file += 1;
3573 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3574 mtc.mt_count += 1;
3575 if (STps->drv_file >= 0)
3576 STps->drv_file += 1;
3577 }
3578 }
3579
3580 if (mtc.mt_op == MTSEEK) {
3581 /* Old position must be restored if partition will be
3582 changed */
3583 i = !STp->can_partitions ||
3584 (STp->new_partition != STp->partition);
3585 } else {
3586 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3587 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3588 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3589 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3590 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3591 mtc.mt_op == MTCOMPRESSION;
3592 }
3593 i = flush_buffer(STp, i);
3594 if (i < 0) {
3595 retval = i;
3596 goto out;
3597 }
3598 if (STps->rw == ST_WRITING &&
3599 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3600 mtc.mt_op == MTSEEK ||
3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3602 i = st_int_ioctl(STp, MTWEOF, 1);
3603 if (i < 0) {
3604 retval = i;
3605 goto out;
3606 }
3607 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3608 mtc.mt_count++;
3609 STps->rw = ST_IDLE;
3610 }
3611
3612 } else {
3613 /*
3614 * If there was a bus reset, block further access
3615 * to this device. If the user wants to rewind the tape,
3616 * then reset the flag and allow access again.
3617 */
3618 if (mtc.mt_op != MTREW &&
3619 mtc.mt_op != MTOFFL &&
3620 mtc.mt_op != MTRETEN &&
3621 mtc.mt_op != MTERASE &&
3622 mtc.mt_op != MTSEEK &&
3623 mtc.mt_op != MTEOM) {
3624 retval = (-EIO);
3625 goto out;
3626 }
3627 reset_state(STp);
3628 /* remove this when the midlevel properly clears was_reset */
3629 STp->device->was_reset = 0;
3630 }
3631
3632 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3633 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3634 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3635 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3636
3637 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3638 do_door_lock(STp, 0); /* Ignore result! */
3639
3640 if (mtc.mt_op == MTSETDRVBUFFER &&
3641 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3642 retval = st_set_options(STp, mtc.mt_count);
3643 goto out;
3644 }
3645
3646 if (mtc.mt_op == MTSETPART) {
3647 if (!STp->can_partitions ||
3648 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3649 retval = (-EINVAL);
3650 goto out;
3651 }
3652 if (mtc.mt_count >= STp->nbr_partitions &&
3653 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3654 retval = (-EIO);
3655 goto out;
3656 }
3657 if (mtc.mt_count >= STp->nbr_partitions) {
3658 retval = (-EINVAL);
3659 goto out;
3660 }
3661 STp->new_partition = mtc.mt_count;
3662 retval = 0;
3663 goto out;
3664 }
3665
3666 if (mtc.mt_op == MTMKPART) {
3667 if (!STp->can_partitions) {
3668 retval = (-EINVAL);
3669 goto out;
3670 }
8038e645
KM		 3671 i = do_load_unload(STp, file, 1);
3672 if (i < 0) {
3673 retval = i;
3674 goto out;
3675 }
3676 i = partition_tape(STp, mtc.mt_count);
3677 if (i < 0) {
1da177e4
LT		 3678 retval = i;
3679 goto out;
3680 }
3681 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3682 STp->ps[i].rw = ST_IDLE;
3683 STp->ps[i].at_sm = 0;
3684 STp->ps[i].last_block_valid = 0;
3685 }
3686 STp->partition = STp->new_partition = 0;
8038e645 3687 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3688 STps->drv_block = STps->drv_file = 0;
3689 retval = 0;
3690 goto out;
3691 }
3692
3693 if (mtc.mt_op == MTSEEK) {
3694 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3695 if (!STp->can_partitions)
3696 STp->ps[0].rw = ST_IDLE;
3697 retval = i;
3698 goto out;
3699 }
3700
3701 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3702 retval = do_load_unload(STp, file, 0);
3703 goto out;
3704 }
3705
3706 if (mtc.mt_op == MTLOAD) {
3707 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3708 goto out;
3709 }
3710
3711 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3712 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3713 goto out;
3714 }
3715
3716 if (STp->can_partitions && STp->ready == ST_READY &&
3717 (i = switch_partition(STp)) < 0) {
3718 retval = i;
3719 goto out;
3720 }
3721
3722 if (mtc.mt_op == MTCOMPRESSION)
3723 retval = st_compression(STp, (mtc.mt_count & 1));
3724 else
3725 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3726 goto out;
3727 }
3728 if (!STm->defined) {
3729 retval = (-ENXIO);
3730 goto out;
3731 }
3732
3733 if ((i = flush_buffer(STp, 0)) < 0) {
3734 retval = i;
3735 goto out;
3736 }
3737 if (STp->can_partitions &&
3738 (i = switch_partition(STp)) < 0) {
3739 retval = i;
3740 goto out;
3741 }
3742
3743 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3744 struct mtget mt_status;
3745
3746 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3747 retval = (-EINVAL);
3748 goto out;
3749 }
3750
3751 mt_status.mt_type = STp->tape_type;
3752 mt_status.mt_dsreg =
3753 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3754 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3755 mt_status.mt_blkno = STps->drv_block;
3756 mt_status.mt_fileno = STps->drv_file;
3757 if (STp->block_size != 0) {
3758 if (STps->rw == ST_WRITING)
3759 mt_status.mt_blkno +=
3760 (STp->buffer)->buffer_bytes / STp->block_size;
3761 else if (STps->rw == ST_READING)
3762 mt_status.mt_blkno -=
3763 ((STp->buffer)->buffer_bytes +
3764 STp->block_size - 1) / STp->block_size;
3765 }
3766
3767 mt_status.mt_gstat = 0;
3768 if (STp->drv_write_prot)
3769 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3770 if (mt_status.mt_blkno == 0) {
3771 if (mt_status.mt_fileno == 0)
3772 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3773 else
3774 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3775 }
3776 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3777 mt_status.mt_resid = STp->partition;
3778 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3779 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3780 else if (STps->eof >= ST_EOM_OK)
3781 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3782 if (STp->density == 1)
3783 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3784 else if (STp->density == 2)
3785 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3786 else if (STp->density == 3)
3787 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3788 if (STp->ready == ST_READY)
3789 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3790 if (STp->ready == ST_NO_TAPE)
3791 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3792 if (STps->at_sm)
3793 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3794 if (STm->do_async_writes ||
3795 (STm->do_buffer_writes && STp->block_size != 0) ||
3796 STp->drv_buffer != 0)
3797 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3798 if (STp->cleaning_req)
3799 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3800
1207045d
AB		 3801 retval = put_user_mtget(p, &mt_status);
3802 if (retval)
1da177e4 3803 goto out;
1da177e4
LT		 3804
3805 STp->recover_reg = 0; /* Clear after read */
1da177e4
LT		 3806 goto out;
3807 } /* End of MTIOCGET */
3808 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3809 struct mtpos mt_pos;
3810 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3811 retval = (-EINVAL);
3812 goto out;
3813 }
3814 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3815 retval = i;
3816 goto out;
3817 }
3818 mt_pos.mt_blkno = blk;
1207045d 3819 retval = put_user_mtpos(p, &mt_pos);
1da177e4
LT		 3820 goto out;
3821 }
28f85009 3822 mutex_unlock(&STp->lock);
d320a955 3823
1da177e4 3824 switch (cmd_in) {
dba7688f
CH		 3825 case SG_IO:
3826 case SCSI_IOCTL_SEND_COMMAND:
3827 case CDROM_SEND_PACKET:
3828 if (!capable(CAP_SYS_RAWIO))
3829 return -EPERM;
6a2ea0d3 3830 break;
dba7688f 3831 default:
dba7688f
CH		 3832 break;
3833 }
d320a955 3834
2e80089c 3835 retval = scsi_ioctl(STp->device, file->f_mode & FMODE_WRITE, cmd_in, p);
dba7688f
CH		 3836 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
3837 /* unload */
3838 STp->rew_at_close = 0;
3839 STp->ready = ST_NO_TAPE;
1da177e4 3840 }
dba7688f 3841 return retval;
1da177e4
LT		 3842
3843 out:
28f85009 3844 mutex_unlock(&STp->lock);
1da177e4
LT		 3845 return retval;
3846}
3847
3848#ifdef CONFIG_COMPAT
1207045d 3849static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4 3850{
1207045d
AB		 3851 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3852 switch (cmd_in) {
1207045d 3853 case MTIOCPOS32:
dba7688f
CH		 3854 cmd_in = MTIOCPOS;
3855 break;
1207045d 3856 case MTIOCGET32:
dba7688f
CH		 3857 cmd_in = MTIOCGET;
3858 break;
1207045d
AB		 3859 }
3860
dba7688f 3861 return st_ioctl(file, cmd_in, arg);
1da177e4
LT		 3862}
3863#endif
3864
3865\f
3866
3867/* Try to allocate a new tape buffer. Calling function must not hold
3868 dev_arr_lock. */
aaff5eba 3869static struct st_buffer *new_tape_buffer(int max_sg)
1da177e4 3870{
1da177e4
LT		 3871 struct st_buffer *tb;
3872
4011f076 3873 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
1da177e4
LT		 3874 if (!tb) {
3875 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3876 return NULL;
3877 }
1ac63cf5 3878 tb->frp_segs = 0;
1da177e4 3879 tb->use_sg = max_sg;
f409d6cc 3880 tb->buffer_size = 0;
1da177e4 3881
6396bb22 3882 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
4011f076 3883 GFP_KERNEL);
d0e1ae31
FT		 3884 if (!tb->reserved_pages) {
3885 kfree(tb);
3886 return NULL;
3887 }
3888
1da177e4
LT		 3889 return tb;
3890}
3891
3892
3893/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3894#define ST_MAX_ORDER 6
3895
aaff5eba 3896static int enlarge_buffer(struct st_buffer * STbuffer, int new_size)
1da177e4 3897{
769989a4 3898 int segs, max_segs, b_size, order, got;
c53033f6 3899 gfp_t priority;
1da177e4
LT		 3900
3901 if (new_size <= STbuffer->buffer_size)
3902 return 1;
3903
3904 if (STbuffer->buffer_size <= PAGE_SIZE)
3905 normalize_buffer(STbuffer); /* Avoid extra segment */
3906
3907 max_segs = STbuffer->use_sg;
1da177e4
LT		 3908
3909 priority = GFP_KERNEL | __GFP_NOWARN;
9c905966 3910
08c95832
FT		 3911 if (STbuffer->cleared)
3912 priority |= __GFP_ZERO;
3913
9c905966 3914 if (STbuffer->frp_segs) {
c982c368 3915 order = STbuffer->reserved_page_order;
08c95832 3916 b_size = PAGE_SIZE << order;
9c905966
FT		 3917 } else {
3918 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3919 order < ST_MAX_ORDER &&
3920 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3921 order++, b_size *= 2)
9c905966 3922 ; /* empty */
373daacf 3923 STbuffer->reserved_page_order = order;
9c905966 3924 }
8f78fc5e
KM		 3925 if (max_segs * (PAGE_SIZE << order) < new_size) {
3926 if (order == ST_MAX_ORDER)
3927 return 0;
3928 normalize_buffer(STbuffer);
aaff5eba 3929 return enlarge_buffer(STbuffer, new_size);
8f78fc5e 3930 }
1da177e4
LT		 3931
3932 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3933 segs < max_segs && got < new_size;) {
08c95832
FT		 3934 struct page *page;
3935
3936 page = alloc_pages(priority, order);
3937 if (!page) {
1da177e4
LT		 3938 DEB(STbuffer->buffer_size = got);
3939 normalize_buffer(STbuffer);
3940 return 0;
3941 }
08c95832 3942
1da177e4
LT		 3943 STbuffer->frp_segs += 1;
3944 got += b_size;
3945 STbuffer->buffer_size = got;
08c95832 3946 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3947 segs++;
3948 }
08c95832 3949 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3950
3951 return 1;
3952}
3953
3954
40f6b36c
KM		 3955/* Make sure that no data from previous user is in the internal buffer */
3956static void clear_buffer(struct st_buffer * st_bp)
3957{
3958 int i;
3959
3960 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3961 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3962 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3963 st_bp->cleared = 1;
3964}
3965
3966
1da177e4
LT		 3967/* Release the extra buffer */
3968static void normalize_buffer(struct st_buffer * STbuffer)
3969{
c982c368 3970 int i, order = STbuffer->reserved_page_order;
1da177e4 3971
1ac63cf5 3972 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3973 __free_pages(STbuffer->reserved_pages[i], order);
3974 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3975 }
1ac63cf5 3976 STbuffer->frp_segs = 0;
8b05b773 3977 STbuffer->sg_segs = 0;
c982c368 3978 STbuffer->reserved_page_order = 0;
d0e1ae31 3979 STbuffer->map_data.offset = 0;
1da177e4
LT		 3980}
3981
3982
3983/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3984 negative error code. */
3985static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3986{
3987 int i, cnt, res, offset;
c982c368 3988 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 3989
3990 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 3991 i < st_bp->frp_segs && offset >= length; i++)
3992 offset -= length;
1da177e4
LT		 3993 if (i == st_bp->frp_segs) { /* Should never happen */
3994 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3995 return (-EIO);
3996 }
3997 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 3998 struct page *page = st_bp->reserved_pages[i];
3999 cnt = length - offset < do_count ? length - offset : do_count;
4000 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4001 if (res)
4002 return (-EFAULT);
4003 do_count -= cnt;
4004 st_bp->buffer_bytes += cnt;
4005 ubp += cnt;
4006 offset = 0;
4007 }
4008 if (do_count) /* Should never happen */
4009 return (-EIO);
4010
4011 return 0;
4012}
4013
4014
4015/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4016 negative error code. */
4017static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4018{
4019 int i, cnt, res, offset;
c982c368 4020 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4021
4022 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4023 i < st_bp->frp_segs && offset >= length; i++)
4024 offset -= length;
1da177e4
LT		 4025 if (i == st_bp->frp_segs) { /* Should never happen */
4026 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4027 return (-EIO);
4028 }
4029 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4030 struct page *page = st_bp->reserved_pages[i];
4031 cnt = length - offset < do_count ? length - offset : do_count;
4032 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4033 if (res)
4034 return (-EFAULT);
4035 do_count -= cnt;
4036 st_bp->buffer_bytes -= cnt;
4037 st_bp->read_pointer += cnt;
4038 ubp += cnt;
4039 offset = 0;
4040 }
4041 if (do_count) /* Should never happen */
4042 return (-EIO);
4043
4044 return 0;
4045}
4046
4047
4048/* Move data towards start of buffer */
4049static void move_buffer_data(struct st_buffer * st_bp, int offset)
4050{
4051 int src_seg, dst_seg, src_offset = 0, dst_offset;
4052 int count, total;
c982c368 4053 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4054
4055 if (offset == 0)
4056 return;
4057
4058 total=st_bp->buffer_bytes - offset;
4059 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4060 src_offset = offset;
08c95832 4061 if (src_offset < length)
1da177e4 4062 break;
08c95832 4063 offset -= length;
1da177e4
LT		 4064 }
4065
4066 st_bp->buffer_bytes = st_bp->read_pointer = total;
4067 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4068 struct page *dpage = st_bp->reserved_pages[dst_seg];
4069 struct page *spage = st_bp->reserved_pages[src_seg];
4070
4071 count = min(length - dst_offset, length - src_offset);
4072 memmove(page_address(dpage) + dst_offset,
4073 page_address(spage) + src_offset, count);
1da177e4 4074 src_offset += count;
08c95832 4075 if (src_offset >= length) {
1da177e4
LT		 4076 src_seg++;
4077 src_offset = 0;
4078 }
4079 dst_offset += count;
08c95832 4080 if (dst_offset >= length) {
1da177e4
LT		 4081 dst_seg++;
4082 dst_offset = 0;
4083 }
4084 total -= count;
4085 }
4086}
4087
1da177e4
LT		 4088/* Validate the options from command line or module parameters */
4089static void validate_options(void)
4090{
4091 if (buffer_kbs > 0)
4092 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4093 if (max_sg_segs >= ST_FIRST_SG)
4094 st_max_sg_segs = max_sg_segs;
4095}
4096
4097#ifndef MODULE
4098/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4099 */
4100static int __init st_setup(char *str)
4101{
4102 int i, len, ints[5];
4103 char *stp;
4104
4105 stp = get_options(str, ARRAY_SIZE(ints), ints);
4106
4107 if (ints[0] > 0) {
4108 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4109 if (parms[i].val)
4110 *parms[i].val = ints[i + 1];
4111 } else {
4112 while (stp != NULL) {
4113 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4114 len = strlen(parms[i].name);
4115 if (!strncmp(stp, parms[i].name, len) &&
4116 (*(stp + len) == ':' || *(stp + len) == '=')) {
4117 if (parms[i].val)
4118 *parms[i].val =
4119 simple_strtoul(stp + len + 1, NULL, 0);
4120 else
4121 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4122 parms[i].name);
4123 break;
4124 }
4125 }
6391a113 4126 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4127 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4128 stp);
4129 stp = strchr(stp, ',');
4130 if (stp)
4131 stp++;
4132 }
4133 }
4134
4135 validate_options();
4136
4137 return 1;
4138}
4139
4140__setup("st=", st_setup);
4141
4142#endif
4143
00977a59 4144static const struct file_operations st_fops =
1da177e4
LT		 4145{
4146 .owner = THIS_MODULE,
4147 .read = st_read,
4148 .write = st_write,
fd66c1b4 4149 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4150#ifdef CONFIG_COMPAT
4151 .compat_ioctl = st_compat_ioctl,
4152#endif
4153 .open = st_open,
4154 .flush = st_flush,
4155 .release = st_release,
b4d878e2 4156 .llseek = noop_llseek,
1da177e4
LT		 4157};
4158
26898afd
JM		 4159static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4160{
4161 int i, error;
4162 dev_t cdev_devno;
4163 struct cdev *cdev;
4164 struct device *dev;
4165 struct st_modedef *STm = &(tape->modes[mode]);
4166 char name[10];
4167 int dev_num = tape->index;
4168
4169 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4170
4171 cdev = cdev_alloc();
4172 if (!cdev) {
4173 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4174 error = -ENOMEM;
4175 goto out;
4176 }
4177 cdev->owner = THIS_MODULE;
4178 cdev->ops = &st_fops;
ab08ee14 4179 STm->cdevs[rew] = cdev;
26898afd
JM		 4180
4181 error = cdev_add(cdev, cdev_devno, 1);
4182 if (error) {
4183 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4184 rew ? "non" : "auto", mode);
4185 pr_err("st%d: Device not attached.\n", dev_num);
4186 goto out_free;
4187 }
26898afd
JM		 4188
4189 i = mode << (4 - ST_NBR_MODE_BITS);
4190 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
45938335 4191 tape->name, st_formats[i]);
26898afd
JM		 4192
4193 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4194 cdev_devno, &tape->modes[mode], "%s", name);
4195 if (IS_ERR(dev)) {
4196 pr_err("st%d: device_create failed\n", dev_num);
4197 error = PTR_ERR(dev);
4198 goto out_free;
4199 }
4200
4201 STm->devs[rew] = dev;
4202
4203 return 0;
4204out_free:
4205 cdev_del(STm->cdevs[rew]);
26898afd 4206out:
ab08ee14
ML		 4207 STm->cdevs[rew] = NULL;
4208 STm->devs[rew] = NULL;
26898afd
JM		 4209 return error;
4210}
4211
4212static int create_cdevs(struct scsi_tape *tape)
4213{
4214 int mode, error;
4215 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4216 error = create_one_cdev(tape, mode, 0);
4217 if (error)
4218 return error;
4219 error = create_one_cdev(tape, mode, 1);
4220 if (error)
4221 return error;
4222 }
4223
4224 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4225 &tape->modes[0].devs[0]->kobj, "tape");
4226}
4227
4228static void remove_cdevs(struct scsi_tape *tape)
4229{
4230 int mode, rew;
4231 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4232 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4233 struct st_modedef *STm = &(tape->modes[mode]);
4234 for (rew = 0; rew < 2; rew++) {
4235 if (STm->cdevs[rew])
4236 cdev_del(STm->cdevs[rew]);
4237 if (STm->devs[rew])
4238 device_unregister(STm->devs[rew]);
4239 }
4240 }
4241}
4242
1da177e4
LT		 4243static int st_probe(struct device *dev)
4244{
4245 struct scsi_device *SDp = to_scsi_device(dev);
1da177e4
LT		 4246 struct scsi_tape *tpnt = NULL;
4247 struct st_modedef *STm;
4248 struct st_partstat *STps;
4249 struct st_buffer *buffer;
b98c52b5 4250 int i, error;
1da177e4
LT		 4251
4252 if (SDp->type != TYPE_TAPE)
4253 return -ENODEV;
f0ee639a 4254 if (st_incompatible(SDp)) {
b30d8bca 4255 sdev_printk(KERN_INFO, SDp,
4e3ea141
HR		 4256 "OnStream tapes are no longer supported;\n");
4257 sdev_printk(KERN_INFO, SDp,
4258 "please mail to linux-scsi@vger.kernel.org.\n");
1da177e4
LT		 4259 return -ENODEV;
4260 }
4261
6fe8c1db 4262 scsi_autopm_get_device(SDp);
8a78362c 4263 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4264 if (st_max_sg_segs < i)
4265 i = st_max_sg_segs;
aaff5eba 4266 buffer = new_tape_buffer(i);
1da177e4 4267 if (buffer == NULL) {
b30d8bca
HR		 4268 sdev_printk(KERN_ERR, SDp,
4269 "st: Can't allocate new tape buffer. "
4270 "Device not attached.\n");
1da177e4
LT		 4271 goto out;
4272 }
4273
1f618aac 4274 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
1da177e4 4275 if (tpnt == NULL) {
b30d8bca
HR		 4276 sdev_printk(KERN_ERR, SDp,
4277 "st: Can't allocate device descriptor.\n");
45938335 4278 goto out_buffer_free;
1da177e4 4279 }
f03a5670 4280 kref_init(&tpnt->kref);
1da177e4
LT		 4281
4282 tpnt->device = SDp;
4283 if (SDp->scsi_level <= 2)
4284 tpnt->tape_type = MT_ISSCSI1;
4285 else
4286 tpnt->tape_type = MT_ISSCSI2;
4287
4288 tpnt->buffer = buffer;
f03a5670 4289 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4290
4291 tpnt->inited = 0;
4292 tpnt->dirty = 0;
4293 tpnt->in_use = 0;
4294 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
1da177e4
LT		 4295 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4296 tpnt->density = 0;
4297 tpnt->do_auto_lock = ST_AUTO_LOCK;
4298 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4299 tpnt->can_partitions = 0;
4300 tpnt->two_fm = ST_TWO_FM;
4301 tpnt->fast_mteom = ST_FAST_MTEOM;
4302 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4303 tpnt->sili = ST_SILI;
1da177e4 4304 tpnt->immediate = ST_NOWAIT;
c743e44f 4305 tpnt->immediate_filemark = 0;
1da177e4
LT		 4306 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4307 tpnt->partition = 0;
4308 tpnt->new_partition = 0;
4309 tpnt->nbr_partitions = 0;
a02488ed 4310 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4 4311 tpnt->long_timeout = ST_LONG_TIMEOUT;
aaff5eba 4312 tpnt->try_dio = try_direct_io;
1da177e4 4313
1da177e4
LT		 4314 for (i = 0; i < ST_NBR_MODES; i++) {
4315 STm = &(tpnt->modes[i]);
4316 STm->defined = 0;
4317 STm->sysv = ST_SYSV;
4318 STm->defaults_for_writes = 0;
4319 STm->do_async_writes = ST_ASYNC_WRITES;
4320 STm->do_buffer_writes = ST_BUFFER_WRITES;
4321 STm->do_read_ahead = ST_READ_AHEAD;
4322 STm->default_compression = ST_DONT_TOUCH;
4323 STm->default_blksize = (-1); /* No forced size */
4324 STm->default_density = (-1); /* No forced density */
6c648d95 4325 STm->tape = tpnt;
1da177e4
LT		 4326 }
4327
4328 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4329 STps = &(tpnt->ps[i]);
4330 STps->rw = ST_IDLE;
4331 STps->eof = ST_NOEOF;
4332 STps->at_sm = 0;
4333 STps->last_block_valid = 0;
4334 STps->drv_block = (-1);
4335 STps->drv_file = (-1);
4336 }
4337
4338 tpnt->current_mode = 0;
4339 tpnt->modes[0].defined = 1;
4340
4341 tpnt->density_changed = tpnt->compression_changed =
4342 tpnt->blksize_changed = 0;
28f85009 4343 mutex_init(&tpnt->lock);
1da177e4 4344
b98c52b5 4345 idr_preload(GFP_KERNEL);
6c648d95 4346 spin_lock(&st_index_lock);
b98c52b5 4347 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4348 spin_unlock(&st_index_lock);
b98c52b5
TH		 4349 idr_preload_end();
4350 if (error < 0) {
6c648d95 4351 pr_warn("st: idr allocation failed: %d\n", error);
45938335 4352 goto out_free_tape;
6c648d95 4353 }
b98c52b5 4354 tpnt->index = error;
45938335 4355 sprintf(tpnt->name, "st%d", tpnt->index);
05545c92
SS		 4356 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4357 if (tpnt->stats == NULL) {
4358 sdev_printk(KERN_ERR, SDp,
4359 "st: Can't allocate statistics.\n");
4360 goto out_idr_remove;
4361 }
6c648d95
JM		 4362
4363 dev_set_drvdata(dev, tpnt);
1da177e4 4364
1da177e4 4365
26898afd
JM		 4366 error = create_cdevs(tpnt);
4367 if (error)
4368 goto out_remove_devs;
46a243f7 4369 scsi_autopm_put_device(SDp);
1da177e4 4370
42252854 4371 sdev_printk(KERN_NOTICE, SDp,
45938335 4372 "Attached scsi tape %s\n", tpnt->name);
42252854 4373 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
45938335 4374 tpnt->name, tpnt->try_dio ? "yes" : "no",
42252854 4375 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4376
4377 return 0;
4378
26898afd
JM		 4379out_remove_devs:
4380 remove_cdevs(tpnt);
05545c92
SS		 4381 kfree(tpnt->stats);
4382out_idr_remove:
6c648d95 4383 spin_lock(&st_index_lock);
b98c52b5 4384 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4385 spin_unlock(&st_index_lock);
45938335 4386out_free_tape:
c9475cb0 4387 kfree(tpnt);
1da177e4
LT		 4388out_buffer_free:
4389 kfree(buffer);
4390out:
6fe8c1db 4391 scsi_autopm_put_device(SDp);
1da177e4
LT		 4392 return -ENODEV;
4393};
4394
4395
4396static int st_remove(struct device *dev)
4397{
6c648d95 4398 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4399 int index = tpnt->index;
4400
4401 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4402 remove_cdevs(tpnt);
1da177e4 4403
6c648d95
JM		 4404 mutex_lock(&st_ref_mutex);
4405 kref_put(&tpnt->kref, scsi_tape_release);
4406 mutex_unlock(&st_ref_mutex);
4407 spin_lock(&st_index_lock);
4408 idr_remove(&st_index_idr, index);
4409 spin_unlock(&st_index_lock);
1da177e4
LT		 4410 return 0;
4411}
4412
f03a5670
KM		 4413/**
4414 * scsi_tape_release - Called to free the Scsi_Tape structure
4415 * @kref: pointer to embedded kref
4416 *
0b950672 4417 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4418 * called on last put, you should always use the scsi_tape_get()
4419 * scsi_tape_put() helpers which manipulate the semaphore directly
4420 * and never do a direct kref_put().
4421 **/
4422static void scsi_tape_release(struct kref *kref)
4423{
4424 struct scsi_tape *tpnt = to_scsi_tape(kref);
f03a5670
KM		 4425
4426 tpnt->device = NULL;
4427
4428 if (tpnt->buffer) {
f03a5670 4429 normalize_buffer(tpnt->buffer);
d0e1ae31 4430 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4431 kfree(tpnt->buffer);
4432 }
4433
05545c92 4434 kfree(tpnt->stats);
f03a5670
KM		 4435 kfree(tpnt);
4436 return;
4437}
4438
af23782b
JM		 4439static struct class st_sysfs_class = {
4440 .name = "scsi_tape",
c69c6be5 4441 .dev_groups = st_dev_groups,
af23782b
JM		 4442};
4443
1da177e4
LT		 4444static int __init init_st(void)
4445{
13026a6b
JG		 4446 int err;
4447
1da177e4
LT		 4448 validate_options();
4449
13026a6b 4450 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4451 verstr, st_fixed_buffer_size, st_max_sg_segs);
4452
2bec708a
LO		 4453 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4454 if (debugging) {
4455 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4456 debugging);
4457 }
4458
af23782b
JM		 4459 err = class_register(&st_sysfs_class);
4460 if (err) {
4461 pr_err("Unable register sysfs class for SCSI tapes\n");
4462 return err;
1da177e4
LT		 4463 }
4464
13026a6b
JG		 4465 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4466 ST_MAX_TAPE_ENTRIES, "st");
4467 if (err) {
4468 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4469 SCSI_TAPE_MAJOR);
4470 goto err_class;
1da177e4
LT		 4471 }
4472
13026a6b
JG		 4473 err = scsi_register_driver(&st_template.gendrv);
4474 if (err)
4475 goto err_chrdev;
4476
13026a6b
JG		 4477 return 0;
4478
13026a6b
JG		 4479err_chrdev:
4480 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4481 ST_MAX_TAPE_ENTRIES);
4482err_class:
af23782b 4483 class_unregister(&st_sysfs_class);
13026a6b 4484 return err;
1da177e4
LT		 4485}
4486
4487static void __exit exit_st(void)
4488{
1da177e4
LT		 4489 scsi_unregister_driver(&st_template.gendrv);
4490 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4491 ST_MAX_TAPE_ENTRIES);
af23782b 4492 class_unregister(&st_sysfs_class);
2d3a5d21 4493 idr_destroy(&st_index_idr);
1da177e4
LT		 4494 printk(KERN_INFO "st: Unloaded.\n");
4495}
4496
4497module_init(init_st);
4498module_exit(exit_st);
4499
4500
4501/* The sysfs driver interface. Read-only at the moment */
10978e48 4502static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4503{
10978e48 4504 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4505}
10978e48 4506static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4507
10978e48 4508static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4509{
10978e48 4510 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4511}
10978e48 4512static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4513
10978e48 4514static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4515{
10978e48 4516 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4517}
10978e48 4518static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4519
10978e48 4520static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4521{
10978e48 4522 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4523}
10978e48 4524static DRIVER_ATTR_RO(version);
1da177e4 4525
d9b43a10
SS		 4526#if DEBUG
4527static ssize_t debug_flag_store(struct device_driver *ddp,
4528 const char *buf, size_t count)
4529{
4530/* We only care what the first byte of the data is the rest is unused.
4531 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4532 * other values have -EINVAL returned if they are passed in.
4533 */
4534 if (count > 0) {
4535 if (buf[0] == '0') {
4536 debugging = NO_DEBUG;
4537 return count;
4538 } else if (buf[0] == '1') {
4539 debugging = 1;
4540 return count;
4541 }
4542 }
4543 return -EINVAL;
4544}
4545
4546static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4547{
4548 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4549}
4550static DRIVER_ATTR_RW(debug_flag);
4551#endif
4552
442d7562
SS		 4553static struct attribute *st_drv_attrs[] = {
4554 &driver_attr_try_direct_io.attr,
4555 &driver_attr_fixed_buffer_size.attr,
4556 &driver_attr_max_sg_segs.attr,
4557 &driver_attr_version.attr,
d9b43a10
SS		 4558#if DEBUG
4559 &driver_attr_debug_flag.attr,
4560#endif
442d7562
SS		 4561 NULL,
4562};
4563ATTRIBUTE_GROUPS(st_drv);
1da177e4 4564
1da177e4 4565/* The sysfs simple class interface */
ee959b00 4566static ssize_t
af23782b 4567defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4568{
7d15d6a4 4569 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4570 ssize_t l = 0;
4571
4572 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4573 return l;
4574}
c69c6be5 4575static DEVICE_ATTR_RO(defined);
1da177e4 4576
ee959b00 4577static ssize_t
af23782b
JM		 4578default_blksize_show(struct device *dev, struct device_attribute *attr,
4579 char *buf)
1da177e4 4580{
7d15d6a4 4581 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4582 ssize_t l = 0;
4583
4584 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4585 return l;
4586}
c69c6be5 4587static DEVICE_ATTR_RO(default_blksize);
1da177e4 4588
ee959b00 4589static ssize_t
af23782b
JM		 4590default_density_show(struct device *dev, struct device_attribute *attr,
4591 char *buf)
1da177e4 4592{
7d15d6a4 4593 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4594 ssize_t l = 0;
4595 char *fmt;
4596
4597 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4598 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4599 return l;
4600}
c69c6be5 4601static DEVICE_ATTR_RO(default_density);
1da177e4 4602
ee959b00 4603static ssize_t
af23782b
JM		 4604default_compression_show(struct device *dev, struct device_attribute *attr,
4605 char *buf)
1da177e4 4606{
7d15d6a4 4607 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4608 ssize_t l = 0;
4609
4610 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4611 return l;
4612}
c69c6be5 4613static DEVICE_ATTR_RO(default_compression);
1da177e4 4614
ee959b00 4615static ssize_t
af23782b 4616options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4617{
7d15d6a4 4618 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4619 struct scsi_tape *STp = STm->tape;
4620 int options;
b174be02
KM		 4621 ssize_t l = 0;
4622
b174be02
KM		 4623 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4624 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4625 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4626 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4627 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4628 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4629 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4630 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4631 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4632 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4633 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4634 options |= STm->sysv ? MT_ST_SYSV : 0;
4635 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4636 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4637 options |= STp->sili ? MT_ST_SILI : 0;
4638
4639 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4640 return l;
4641}
c69c6be5
GKH		 4642static DEVICE_ATTR_RO(options);
4643
05545c92
SS		 4644/* Support for tape stats */
4645
4646/**
4647 * read_cnt_show - return read count - count of reads made from tape drive
4648 * @dev: struct device
4649 * @attr: attribute structure
4650 * @buf: buffer to return formatted data in
4651 */
4652static ssize_t read_cnt_show(struct device *dev,
4653 struct device_attribute *attr, char *buf)
4654{
4655 struct st_modedef *STm = dev_get_drvdata(dev);
4656
4657 return sprintf(buf, "%lld",
4658 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4659}
4660static DEVICE_ATTR_RO(read_cnt);
4661
4662/**
4663 * read_byte_cnt_show - return read byte count - tape drives
4664 * may use blocks less than 512 bytes this gives the raw byte count of
4665 * of data read from the tape drive.
4666 * @dev: struct device
4667 * @attr: attribute structure
4668 * @buf: buffer to return formatted data in
4669 */
4670static ssize_t read_byte_cnt_show(struct device *dev,
4671 struct device_attribute *attr, char *buf)
4672{
4673 struct st_modedef *STm = dev_get_drvdata(dev);
4674
4675 return sprintf(buf, "%lld",
4676 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4677}
4678static DEVICE_ATTR_RO(read_byte_cnt);
4679
4680/**
e2dca2a2 4681 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
05545c92
SS		 4682 * @dev: struct device
4683 * @attr: attribute structure
4684 * @buf: buffer to return formatted data in
4685 */
4686static ssize_t read_ns_show(struct device *dev,
4687 struct device_attribute *attr, char *buf)
4688{
4689 struct st_modedef *STm = dev_get_drvdata(dev);
4690
4691 return sprintf(buf, "%lld",
4692 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4693}
4694static DEVICE_ATTR_RO(read_ns);
4695
4696/**
4697 * write_cnt_show - write count - number of user calls
4698 * to write(2) that have written data to tape.
4699 * @dev: struct device
4700 * @attr: attribute structure
4701 * @buf: buffer to return formatted data in
4702 */
4703static ssize_t write_cnt_show(struct device *dev,
4704 struct device_attribute *attr, char *buf)
4705{
4706 struct st_modedef *STm = dev_get_drvdata(dev);
4707
4708 return sprintf(buf, "%lld",
4709 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4710}
4711static DEVICE_ATTR_RO(write_cnt);
4712
4713/**
4714 * write_byte_cnt_show - write byte count - raw count of
4715 * bytes written to tape.
4716 * @dev: struct device
4717 * @attr: attribute structure
4718 * @buf: buffer to return formatted data in
4719 */
4720static ssize_t write_byte_cnt_show(struct device *dev,
4721 struct device_attribute *attr, char *buf)
4722{
4723 struct st_modedef *STm = dev_get_drvdata(dev);
4724
4725 return sprintf(buf, "%lld",
4726 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4727}
4728static DEVICE_ATTR_RO(write_byte_cnt);
4729
4730/**
4731 * write_ns_show - write ns - number of nanoseconds waiting on write
4732 * requests to complete.
4733 * @dev: struct device
4734 * @attr: attribute structure
4735 * @buf: buffer to return formatted data in
4736 */
4737static ssize_t write_ns_show(struct device *dev,
4738 struct device_attribute *attr, char *buf)
4739{
4740 struct st_modedef *STm = dev_get_drvdata(dev);
4741
4742 return sprintf(buf, "%lld",
4743 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4744}
4745static DEVICE_ATTR_RO(write_ns);
4746
4747/**
4748 * in_flight_show - number of I/Os currently in flight -
4749 * in most cases this will be either 0 or 1. It may be higher if someone
4750 * has also issued other SCSI commands such as via an ioctl.
4751 * @dev: struct device
4752 * @attr: attribute structure
4753 * @buf: buffer to return formatted data in
4754 */
4755static ssize_t in_flight_show(struct device *dev,
4756 struct device_attribute *attr, char *buf)
4757{
4758 struct st_modedef *STm = dev_get_drvdata(dev);
4759
4760 return sprintf(buf, "%lld",
4761 (long long)atomic64_read(&STm->tape->stats->in_flight));
4762}
4763static DEVICE_ATTR_RO(in_flight);
4764
4765/**
4766 * io_ns_show - io wait ns - this is the number of ns spent
4767 * waiting on all I/O to complete. This includes tape movement commands
4768 * such as rewinding, seeking to end of file or tape, it also includes
4769 * read and write. To determine the time spent on tape movement
4770 * subtract the read and write ns from this value.
4771 * @dev: struct device
4772 * @attr: attribute structure
4773 * @buf: buffer to return formatted data in
4774 */
4775static ssize_t io_ns_show(struct device *dev,
4776 struct device_attribute *attr, char *buf)
4777{
4778 struct st_modedef *STm = dev_get_drvdata(dev);
4779
4780 return sprintf(buf, "%lld",
4781 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4782}
4783static DEVICE_ATTR_RO(io_ns);
4784
4785/**
4786 * other_cnt_show - other io count - this is the number of
4787 * I/O requests other than read and write requests.
4788 * Typically these are tape movement requests but will include driver
4789 * tape movement. This includes only requests issued by the st driver.
4790 * @dev: struct device
4791 * @attr: attribute structure
4792 * @buf: buffer to return formatted data in
4793 */
4794static ssize_t other_cnt_show(struct device *dev,
4795 struct device_attribute *attr, char *buf)
4796{
4797 struct st_modedef *STm = dev_get_drvdata(dev);
4798
4799 return sprintf(buf, "%lld",
4800 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4801}
4802static DEVICE_ATTR_RO(other_cnt);
4803
4804/**
4805 * resid_cnt_show - A count of the number of times we get a residual
4806 * count - this should indicate someone issuing reads larger than the
4807 * block size on tape.
4808 * @dev: struct device
4809 * @attr: attribute structure
4810 * @buf: buffer to return formatted data in
4811 */
4812static ssize_t resid_cnt_show(struct device *dev,
4813 struct device_attribute *attr, char *buf)
4814{
4815 struct st_modedef *STm = dev_get_drvdata(dev);
4816
4817 return sprintf(buf, "%lld",
4818 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4819}
4820static DEVICE_ATTR_RO(resid_cnt);
4821
c69c6be5
GKH		 4822static struct attribute *st_dev_attrs[] = {
4823 &dev_attr_defined.attr,
4824 &dev_attr_default_blksize.attr,
4825 &dev_attr_default_density.attr,
4826 &dev_attr_default_compression.attr,
4827 &dev_attr_options.attr,
4828 NULL,
af23782b 4829};
05545c92
SS		 4830
4831static struct attribute *st_stats_attrs[] = {
4832 &dev_attr_read_cnt.attr,
4833 &dev_attr_read_byte_cnt.attr,
4834 &dev_attr_read_ns.attr,
4835 &dev_attr_write_cnt.attr,
4836 &dev_attr_write_byte_cnt.attr,
4837 &dev_attr_write_ns.attr,
4838 &dev_attr_in_flight.attr,
4839 &dev_attr_io_ns.attr,
4840 &dev_attr_other_cnt.attr,
4841 &dev_attr_resid_cnt.attr,
4842 NULL,
4843};
4844
4845static struct attribute_group stats_group = {
4846 .name = "stats",
4847 .attrs = st_stats_attrs,
4848};
4849
4850static struct attribute_group st_group = {
4851 .attrs = st_dev_attrs,
4852};
4853
4854static const struct attribute_group *st_dev_groups[] = {
4855 &st_group,
4856 &stats_group,
4857 NULL,
4858};
b174be02 4859
1da177e4 4860/* The following functions may be useful for a larger audience. */
6620742f
FT		 4861static int sgl_map_user_pages(struct st_buffer *STbp,
4862 const unsigned int max_pages, unsigned long uaddr,
4863 size_t count, int rw)
1da177e4 4864{
07542b83
JB		 4865 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4866 unsigned long start = uaddr >> PAGE_SHIFT;
4867 const int nr_pages = end - start;
08e9cbe7 4868 int res, i;
1da177e4 4869 struct page **pages;
6620742f 4870 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4871
1da177e4
LT		 4872 /* User attempted Overflow! */
4873 if ((uaddr + count) < uaddr)
4874 return -EINVAL;
4875
4876 /* Too big */
4877 if (nr_pages > max_pages)
4878 return -ENOMEM;
4879
4880 /* Hmm? */
4881 if (count == 0)
4882 return 0;
4883
6da2ec56
KC		 4884 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4885 if (pages == NULL)
1da177e4
LT		 4886 return -ENOMEM;
4887
4888 /* Try to fault in all of the necessary pages */
1da177e4 4889 /* rw==READ means read from drive, write into memory area */
08e9cbe7 4890 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
73b0140b 4891 pages);
1da177e4
LT		 4892
4893 /* Errors and no page mapped should return here */
4894 if (res < nr_pages)
4895 goto out_unmap;
4896
4897 for (i=0; i < nr_pages; i++) {
4898 /* FIXME: flush superflous for rw==READ,
4899 * probably wrong function for rw==WRITE
4900 */
4901 flush_dcache_page(pages[i]);
4902 }
4903
6620742f 4904 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4905 STbp->mapped_pages = pages;
1da177e4 4906
1da177e4 4907 return nr_pages;
1da177e4
LT		 4908 out_unmap:
4909 if (res > 0) {
08e9cbe7 4910 unpin_user_pages(pages, res);
6bc733e9 4911 res = 0;
1da177e4
LT		 4912 }
4913 kfree(pages);
4914 return res;
4915}
4916
4917
4918/* And unmap them... */
6620742f
FT		 4919static int sgl_unmap_user_pages(struct st_buffer *STbp,
4920 const unsigned int nr_pages, int dirtied)
1da177e4 4921{
08e9cbe7
JH		 4922 /* FIXME: cache flush missing for rw==READ */
4923 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);
b5810039 4924
6620742f
FT		 4925 kfree(STbp->mapped_pages);
4926 STbp->mapped_pages = NULL;
1da177e4
LT		 4927
4928 return 0;
4929}
Linux 6.x block layer and io_uring tree(s)