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scsi: target: Rename target_setup_cmd_from_cdb() to target_cmd_parse_cdb()
[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>
16c4b3e2 35#include <linux/cdrom.h>
1da177e4
LT		 36#include <linux/ioctl.h>
37#include <linux/fcntl.h>
38#include <linux/spinlock.h>
39#include <linux/blkdev.h>
40#include <linux/moduleparam.h>
1da177e4 41#include <linux/cdev.h>
6c648d95 42#include <linux/idr.h>
1da177e4 43#include <linux/delay.h>
0b950672 44#include <linux/mutex.h>
1da177e4 45
7c0f6ba6 46#include <linux/uaccess.h>
1da177e4 47#include <asm/dma.h>
35b703db 48#include <asm/unaligned.h>
1da177e4
LT		 49
50#include <scsi/scsi.h>
51#include <scsi/scsi_dbg.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_driver.h>
54#include <scsi/scsi_eh.h>
55#include <scsi/scsi_host.h>
56#include <scsi/scsi_ioctl.h>
16c4b3e2 57#include <scsi/sg.h>
1da177e4
LT		 58
59
60/* The driver prints some debugging information on the console if DEBUG
61 is defined and non-zero. */
2bec708a
LO		 62#define DEBUG 1
63#define NO_DEBUG 0
1da177e4 64
b30d8bca 65#define ST_DEB_MSG KERN_NOTICE
1da177e4
LT		 66#if DEBUG
67/* The message level for the debug messages is currently set to KERN_NOTICE
68 so that people can easily see the messages. Later when the debugging messages
69 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
1da177e4
LT		 70#define DEB(a) a
71#define DEBC(a) if (debugging) { a ; }
72#else
73#define DEB(a)
74#define DEBC(a)
75#endif
76
77#define ST_KILOBYTE 1024
78
79#include "st_options.h"
80#include "st.h"
81
82static int buffer_kbs;
83static int max_sg_segs;
84static int try_direct_io = TRY_DIRECT_IO;
85static int try_rdio = 1;
86static int try_wdio = 1;
2bec708a 87static int debug_flag;
1da177e4 88
af23782b 89static struct class st_sysfs_class;
c69c6be5 90static const struct attribute_group *st_dev_groups[];
442d7562 91static const struct attribute_group *st_drv_groups[];
1da177e4
LT		 92
93MODULE_AUTHOR("Kai Makisara");
f018fa55 94MODULE_DESCRIPTION("SCSI tape (st) driver");
1da177e4 95MODULE_LICENSE("GPL");
f018fa55 96MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
d7b8bcb0 97MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
1da177e4
LT		 98
99/* Set 'perm' (4th argument) to 0 to disable module_param's definition
100 * of sysfs parameters (which module_param doesn't yet support).
101 * Sysfs parameters defined explicitly later.
102 */
103module_param_named(buffer_kbs, buffer_kbs, int, 0);
104MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
105module_param_named(max_sg_segs, max_sg_segs, int, 0);
106MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
107module_param_named(try_direct_io, try_direct_io, int, 0);
108MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
2bec708a
LO		 109module_param_named(debug_flag, debug_flag, int, 0);
110MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
111
1da177e4
LT		 112
113/* Extra parameters for testing */
114module_param_named(try_rdio, try_rdio, int, 0);
115MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
116module_param_named(try_wdio, try_wdio, int, 0);
117MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
118
119#ifndef MODULE
120static int write_threshold_kbs; /* retained for compatibility */
121static struct st_dev_parm {
122 char *name;
123 int *val;
124} parms[] __initdata = {
125 {
126 "buffer_kbs", &buffer_kbs
127 },
128 { /* Retained for compatibility with 2.4 */
129 "write_threshold_kbs", &write_threshold_kbs
130 },
131 {
132 "max_sg_segs", NULL
133 },
134 {
135 "try_direct_io", &try_direct_io
2bec708a
LO		 136 },
137 {
138 "debug_flag", &debug_flag
1da177e4
LT		 139 }
140};
141#endif
142
143/* Restrict the number of modes so that names for all are assigned */
144#if ST_NBR_MODES > 16
145#error "Maximum number of modes is 16"
146#endif
147/* Bit reversed order to get same names for same minors with all
148 mode counts */
0ad78200 149static const char *st_formats[] = {
1da177e4
LT		 150 "", "r", "k", "s", "l", "t", "o", "u",
151 "m", "v", "p", "x", "a", "y", "q", "z"};
152
153/* The default definitions have been moved to st_options.h */
154
155#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
156
157/* The buffer size should fit into the 24 bits for length in the
158 6-byte SCSI read and write commands. */
159#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
160#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
161#endif
162
163static int debugging = DEBUG;
164
165#define MAX_RETRIES 0
166#define MAX_WRITE_RETRIES 0
167#define MAX_READY_RETRIES 0
168#define NO_TAPE NOT_READY
169
170#define ST_TIMEOUT (900 * HZ)
171#define ST_LONG_TIMEOUT (14000 * HZ)
172
173/* Remove mode bits and auto-rewind bit (7) */
174#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
6f46f718 175 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
1da177e4
LT		 176#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
177
178/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
179#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
180 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
181
182/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
183 24 bits) */
184#define SET_DENS_AND_BLK 0x10001
185
1da177e4
LT		 186static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
187static int st_max_sg_segs = ST_MAX_SG;
188
1da177e4
LT		 189static int modes_defined;
190
1da177e4 191static int enlarge_buffer(struct st_buffer *, int, int);
40f6b36c 192static void clear_buffer(struct st_buffer *);
1da177e4
LT		 193static void normalize_buffer(struct st_buffer *);
194static int append_to_buffer(const char __user *, struct st_buffer *, int);
195static int from_buffer(struct st_buffer *, char __user *, int);
196static void move_buffer_data(struct st_buffer *, int);
1da177e4 197
6620742f 198static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
1da177e4 199 unsigned long, size_t, int);
6620742f 200static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
1da177e4
LT		 201
202static int st_probe(struct device *);
203static int st_remove(struct device *);
1da177e4 204
1da177e4 205static struct scsi_driver st_template = {
1da177e4
LT		 206 .gendrv = {
207 .name = "st",
3af6b352 208 .owner = THIS_MODULE,
1da177e4
LT		 209 .probe = st_probe,
210 .remove = st_remove,
442d7562 211 .groups = st_drv_groups,
1da177e4 212 },
1da177e4
LT		 213};
214
215static int st_compression(struct scsi_tape *, int);
216
217static int find_partition(struct scsi_tape *);
218static int switch_partition(struct scsi_tape *);
219
220static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
221
f03a5670
KM		 222static void scsi_tape_release(struct kref *);
223
224#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
225
0b950672 226static DEFINE_MUTEX(st_ref_mutex);
6c648d95
JM		 227static DEFINE_SPINLOCK(st_index_lock);
228static DEFINE_SPINLOCK(st_use_lock);
229static DEFINE_IDR(st_index_idr);
230
f03a5670 231
1da177e4 232\f
1da177e4
LT		 233#ifndef SIGS_FROM_OSST
234#define SIGS_FROM_OSST \
235 {"OnStream", "SC-", "", "osst"}, \
236 {"OnStream", "DI-", "", "osst"}, \
237 {"OnStream", "DP-", "", "osst"}, \
238 {"OnStream", "USB", "", "osst"}, \
239 {"OnStream", "FW-", "", "osst"}
240#endif
241
f03a5670
KM		 242static struct scsi_tape *scsi_tape_get(int dev)
243{
244 struct scsi_tape *STp = NULL;
245
0b950672 246 mutex_lock(&st_ref_mutex);
6c648d95 247 spin_lock(&st_index_lock);
f03a5670 248
6c648d95 249 STp = idr_find(&st_index_idr, dev);
f03a5670
KM		 250 if (!STp) goto out;
251
252 kref_get(&STp->kref);
253
254 if (!STp->device)
255 goto out_put;
256
257 if (scsi_device_get(STp->device))
258 goto out_put;
259
260 goto out;
261
262out_put:
263 kref_put(&STp->kref, scsi_tape_release);
264 STp = NULL;
265out:
6c648d95 266 spin_unlock(&st_index_lock);
0b950672 267 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 268 return STp;
269}
270
271static void scsi_tape_put(struct scsi_tape *STp)
272{
273 struct scsi_device *sdev = STp->device;
274
0b950672 275 mutex_lock(&st_ref_mutex);
f03a5670
KM		 276 kref_put(&STp->kref, scsi_tape_release);
277 scsi_device_put(sdev);
0b950672 278 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 279}
280
1da177e4
LT		 281struct st_reject_data {
282 char *vendor;
283 char *model;
284 char *rev;
285 char *driver_hint; /* Name of the correct driver, NULL if unknown */
286};
287
288static struct st_reject_data reject_list[] = {
289 /* {"XXX", "Yy-", "", NULL}, example */
290 SIGS_FROM_OSST,
291 {NULL, }};
292
293/* If the device signature is on the list of incompatible drives, the
294 function returns a pointer to the name of the correct driver (if known) */
295static char * st_incompatible(struct scsi_device* SDp)
296{
297 struct st_reject_data *rp;
298
299 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
300 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
301 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
302 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
303 if (rp->driver_hint)
304 return rp->driver_hint;
305 else
306 return "unknown";
307 }
308 return NULL;
309}
310\f
311
312static inline char *tape_name(struct scsi_tape *tape)
313{
314 return tape->disk->disk_name;
315}
316
b30d8bca 317#define st_printk(prefix, t, fmt, a...) \
22e0d994 318 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
b30d8bca
HR		 319#ifdef DEBUG
320#define DEBC_printk(t, fmt, a...) \
321 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
322#else
323#define DEBC_printk(t, fmt, a...)
324#endif
1da177e4 325
8b05b773 326static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
1da177e4
LT		 327{
328 const u8 *ucp;
8b05b773 329 const u8 *sense = SRpnt->sense;
1da177e4 330
8b05b773
MC		 331 s->have_sense = scsi_normalize_sense(SRpnt->sense,
332 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
1da177e4
LT		 333 s->flags = 0;
334
335 if (s->have_sense) {
336 s->deferred = 0;
337 s->remainder_valid =
338 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
339 switch (sense[0] & 0x7f) {
340 case 0x71:
341 s->deferred = 1;
211d62a8 342 /* fall through */
1da177e4
LT		 343 case 0x70:
344 s->fixed_format = 1;
345 s->flags = sense[2] & 0xe0;
346 break;
347 case 0x73:
348 s->deferred = 1;
211d62a8 349 /* fall through */
1da177e4
LT		 350 case 0x72:
351 s->fixed_format = 0;
352 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
353 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
354 break;
355 }
356 }
357}
358
359
360/* Convert the result to success code */
8b05b773 361static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
1da177e4 362{
8b05b773 363 int result = SRpnt->result;
1da177e4
LT		 364 u8 scode;
365 DEB(const char *stp;)
366 char *name = tape_name(STp);
367 struct st_cmdstatus *cmdstatp;
368
369 if (!result)
370 return 0;
371
372 cmdstatp = &STp->buffer->cmdstat;
f03a5670 373 st_analyze_sense(SRpnt, cmdstatp);
1da177e4
LT		 374
375 if (cmdstatp->have_sense)
376 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
377 else
378 scode = 0;
379
b30d8bca
HR		 380 DEB(
381 if (debugging) {
382 st_printk(ST_DEB_MSG, STp,
383 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
384 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
385 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
1da177e4 386 if (cmdstatp->have_sense)
d811b848
HR		 387 __scsi_print_sense(STp->device, name,
388 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 389 } ) /* end DEB */
390 if (!debugging) { /* Abnormal conditions for tape */
391 if (!cmdstatp->have_sense)
b30d8bca
HR		 392 st_printk(KERN_WARNING, STp,
393 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
394 result, driver_byte(result), host_byte(result));
1da177e4
LT		 395 else if (cmdstatp->have_sense &&
396 scode != NO_SENSE &&
397 scode != RECOVERED_ERROR &&
398 /* scode != UNIT_ATTENTION && */
399 scode != BLANK_CHECK &&
400 scode != VOLUME_OVERFLOW &&
8b05b773
MC		 401 SRpnt->cmd[0] != MODE_SENSE &&
402 SRpnt->cmd[0] != TEST_UNIT_READY) {
4e73ea7b 403
d811b848
HR		 404 __scsi_print_sense(STp->device, name,
405 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 406 }
407 }
408
409 if (cmdstatp->fixed_format &&
410 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
411 if (STp->cln_sense_value)
8b05b773 412 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 413 STp->cln_sense_mask) == STp->cln_sense_value);
414 else
8b05b773 415 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 416 STp->cln_sense_mask) != 0);
417 }
418 if (cmdstatp->have_sense &&
419 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
420 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
421
422 STp->pos_unknown |= STp->device->was_reset;
423
424 if (cmdstatp->have_sense &&
425 scode == RECOVERED_ERROR
426#if ST_RECOVERED_WRITE_FATAL
8b05b773
MC		 427 && SRpnt->cmd[0] != WRITE_6
428 && SRpnt->cmd[0] != WRITE_FILEMARKS
1da177e4
LT		 429#endif
430 ) {
431 STp->recover_count++;
432 STp->recover_reg++;
433
b30d8bca 434 DEB(
1da177e4 435 if (debugging) {
8b05b773 436 if (SRpnt->cmd[0] == READ_6)
1da177e4 437 stp = "read";
8b05b773 438 else if (SRpnt->cmd[0] == WRITE_6)
1da177e4
LT		 439 stp = "write";
440 else
441 stp = "ioctl";
b30d8bca
HR		 442 st_printk(ST_DEB_MSG, STp,
443 "Recovered %s error (%d).\n",
444 stp, STp->recover_count);
1da177e4
LT		 445 } ) /* end DEB */
446
447 if (cmdstatp->flags == 0)
448 return 0;
449 }
450 return (-EIO);
451}
452
4deba245 453static struct st_request *st_allocate_request(struct scsi_tape *stp)
8b05b773 454{
4deba245
FT		 455 struct st_request *streq;
456
457 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
458 if (streq)
459 streq->stp = stp;
460 else {
b30d8bca
HR		 461 st_printk(KERN_ERR, stp,
462 "Can't get SCSI request.\n");
4deba245
FT		 463 if (signal_pending(current))
464 stp->buffer->syscall_result = -EINTR;
465 else
466 stp->buffer->syscall_result = -EBUSY;
467 }
468
469 return streq;
8b05b773
MC		 470}
471
472static void st_release_request(struct st_request *streq)
473{
474 kfree(streq);
1da177e4
LT		 475}
476
05545c92
SS		 477static void st_do_stats(struct scsi_tape *STp, struct request *req)
478{
479 ktime_t now;
480
481 now = ktime_get();
82ed4db4 482 if (scsi_req(req)->cmd[0] == WRITE_6) {
05545c92
SS		 483 now = ktime_sub(now, STp->stats->write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
485 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
486 atomic64_inc(&STp->stats->write_cnt);
17d5363b 487 if (scsi_req(req)->result) {
05545c92
SS		 488 atomic64_add(atomic_read(&STp->stats->last_write_size)
489 - STp->buffer->cmdstat.residual,
490 &STp->stats->write_byte_cnt);
491 if (STp->buffer->cmdstat.residual > 0)
492 atomic64_inc(&STp->stats->resid_cnt);
493 } else
494 atomic64_add(atomic_read(&STp->stats->last_write_size),
495 &STp->stats->write_byte_cnt);
82ed4db4 496 } else if (scsi_req(req)->cmd[0] == READ_6) {
05545c92
SS		 497 now = ktime_sub(now, STp->stats->read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
499 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
500 atomic64_inc(&STp->stats->read_cnt);
17d5363b 501 if (scsi_req(req)->result) {
05545c92
SS		 502 atomic64_add(atomic_read(&STp->stats->last_read_size)
503 - STp->buffer->cmdstat.residual,
504 &STp->stats->read_byte_cnt);
505 if (STp->buffer->cmdstat.residual > 0)
506 atomic64_inc(&STp->stats->resid_cnt);
507 } else
508 atomic64_add(atomic_read(&STp->stats->last_read_size),
509 &STp->stats->read_byte_cnt);
510 } else {
511 now = ktime_sub(now, STp->stats->other_time);
512 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
513 atomic64_inc(&STp->stats->other_cnt);
514 }
515 atomic64_dec(&STp->stats->in_flight);
516}
517
2a842aca 518static void st_scsi_execute_end(struct request *req, blk_status_t status)
13b53b44
FT		 519{
520 struct st_request *SRpnt = req->end_io_data;
82ed4db4 521 struct scsi_request *rq = scsi_req(req);
13b53b44 522 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 523 struct bio *tmp;
13b53b44 524
17d5363b 525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
82ed4db4 526 STp->buffer->cmdstat.residual = rq->resid_len;
13b53b44 527
05545c92
SS		 528 st_do_stats(STp, req);
529
c68bf8ee 530 tmp = SRpnt->bio;
82ed4db4
CH		 531 if (rq->sense_len)
532 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
13b53b44
FT		 533 if (SRpnt->waiting)
534 complete(SRpnt->waiting);
535
c68bf8ee 536 blk_rq_unmap_user(tmp);
92bc5a24 537 blk_put_request(req);
13b53b44
FT		 538}
539
540static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
541 int data_direction, void *buffer, unsigned bufflen,
542 int timeout, int retries)
543{
544 struct request *req;
82ed4db4 545 struct scsi_request *rq;
13b53b44
FT		 546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
547 int err = 0;
05545c92 548 struct scsi_tape *STp = SRpnt->stp;
13b53b44 549
aebf526b
CH		 550 req = blk_get_request(SRpnt->stp->device->request_queue,
551 data_direction == DMA_TO_DEVICE ?
ff005a06 552 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
a492f075 553 if (IS_ERR(req))
13b53b44 554 return DRIVER_ERROR << 24;
82ed4db4 555 rq = scsi_req(req);
e8064021 556 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 557
558 mdata->null_mapped = 1;
559
02ae2c0e
KM		 560 if (bufflen) {
561 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
562 GFP_KERNEL);
563 if (err) {
564 blk_put_request(req);
565 return DRIVER_ERROR << 24;
566 }
13b53b44
FT		 567 }
568
05545c92
SS		 569 atomic64_inc(&STp->stats->in_flight);
570 if (cmd[0] == WRITE_6) {
571 atomic_set(&STp->stats->last_write_size, bufflen);
572 STp->stats->write_time = ktime_get();
573 } else if (cmd[0] == READ_6) {
574 atomic_set(&STp->stats->last_read_size, bufflen);
575 STp->stats->read_time = ktime_get();
576 } else {
577 STp->stats->other_time = ktime_get();
578 }
579
13b53b44 580 SRpnt->bio = req->bio;
82ed4db4
CH		 581 rq->cmd_len = COMMAND_SIZE(cmd[0]);
582 memset(rq->cmd, 0, BLK_MAX_CDB);
583 memcpy(rq->cmd, cmd, rq->cmd_len);
13b53b44 584 req->timeout = timeout;
64c7f1d1 585 rq->retries = retries;
13b53b44
FT		 586 req->end_io_data = SRpnt;
587
588 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
589 return 0;
590}
591
1da177e4
LT		 592/* Do the scsi command. Waits until command performed if do_wait is true.
593 Otherwise write_behind_check() is used to check that the command
594 has finished. */
8b05b773
MC		 595static struct st_request *
596st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 597 int bytes, int direction, int timeout, int retries, int do_wait)
598{
f03a5670 599 struct completion *waiting;
6d476267
FT		 600 struct rq_map_data *mdata = &STp->buffer->map_data;
601 int ret;
1da177e4 602
f03a5670
KM		 603 /* if async, make sure there's no command outstanding */
604 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 605 st_printk(KERN_ERR, STp,
606 "Async command already active.\n");
f03a5670
KM		 607 if (signal_pending(current))
608 (STp->buffer)->syscall_result = (-EINTR);
609 else
610 (STp->buffer)->syscall_result = (-EBUSY);
611 return NULL;
612 }
613
4deba245
FT		 614 if (!SRpnt) {
615 SRpnt = st_allocate_request(STp);
616 if (!SRpnt)
1da177e4 617 return NULL;
1da177e4
LT		 618 }
619
f03a5670
KM		 620 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
621 which IO is outstanding. It's nulled out when the IO completes. */
622 if (!do_wait)
623 (STp->buffer)->last_SRpnt = SRpnt;
624
625 waiting = &STp->wait;
626 init_completion(waiting);
8b05b773 627 SRpnt->waiting = waiting;
1da177e4 628
6620742f 629 if (STp->buffer->do_dio) {
c982c368 630 mdata->page_order = 0;
6620742f
FT		 631 mdata->nr_entries = STp->buffer->sg_segs;
632 mdata->pages = STp->buffer->mapped_pages;
633 } else {
c982c368 634 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 635 mdata->nr_entries =
636 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 637 mdata->pages = STp->buffer->reserved_pages;
638 mdata->offset = 0;
6d476267
FT		 639 }
640
8b05b773
MC		 641 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
642 STp->buffer->cmdstat.have_sense = 0;
643 STp->buffer->syscall_result = 0;
644
6620742f
FT		 645 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
646 retries);
6d476267 647 if (ret) {
8b05b773
MC		 648 /* could not allocate the buffer or request was too large */
649 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 650 (STp->buffer)->last_SRpnt = NULL;
6d476267 651 } else if (do_wait) {
f03a5670 652 wait_for_completion(waiting);
8b05b773 653 SRpnt->waiting = NULL;
1da177e4
LT		 654 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
655 }
8b05b773 656
1da177e4
LT		 657 return SRpnt;
658}
659
660
661/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
662 write has been correct but EOM early warning reached, -EIO if write ended in
663 error or zero if write successful. Asynchronous writes are used only in
664 variable block mode. */
665static int write_behind_check(struct scsi_tape * STp)
666{
667 int retval = 0;
668 struct st_buffer *STbuffer;
669 struct st_partstat *STps;
670 struct st_cmdstatus *cmdstatp;
8b05b773 671 struct st_request *SRpnt;
1da177e4
LT		 672
673 STbuffer = STp->buffer;
674 if (!STbuffer->writing)
675 return 0;
676
b30d8bca 677 DEB(
1da177e4
LT		 678 if (STp->write_pending)
679 STp->nbr_waits++;
680 else
681 STp->nbr_finished++;
b30d8bca 682 ) /* end DEB */
1da177e4
LT		 683
684 wait_for_completion(&(STp->wait));
f03a5670
KM		 685 SRpnt = STbuffer->last_SRpnt;
686 STbuffer->last_SRpnt = NULL;
8b05b773 687 SRpnt->waiting = NULL;
1da177e4 688
f03a5670 689 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 690 st_release_request(SRpnt);
1da177e4
LT		 691
692 STbuffer->buffer_bytes -= STbuffer->writing;
693 STps = &(STp->ps[STp->partition]);
694 if (STps->drv_block >= 0) {
695 if (STp->block_size == 0)
696 STps->drv_block++;
697 else
698 STps->drv_block += STbuffer->writing / STp->block_size;
699 }
700
701 cmdstatp = &STbuffer->cmdstat;
702 if (STbuffer->syscall_result) {
703 retval = -EIO;
704 if (cmdstatp->have_sense && !cmdstatp->deferred &&
705 (cmdstatp->flags & SENSE_EOM) &&
706 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
707 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
708 /* EOM at write-behind, has all data been written? */
709 if (!cmdstatp->remainder_valid ||
710 cmdstatp->uremainder64 == 0)
711 retval = -ENOSPC;
712 }
713 if (retval == -EIO)
714 STps->drv_block = -1;
715 }
716 STbuffer->writing = 0;
717
718 DEB(if (debugging && retval)
b30d8bca
HR		 719 st_printk(ST_DEB_MSG, STp,
720 "Async write error %x, return value %d.\n",
721 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 722
723 return retval;
724}
725
726
727/* Step over EOF if it has been inadvertently crossed (ioctl not used because
728 it messes up the block number). */
729static int cross_eof(struct scsi_tape * STp, int forward)
730{
8b05b773 731 struct st_request *SRpnt;
1da177e4
LT		 732 unsigned char cmd[MAX_COMMAND_SIZE];
733
734 cmd[0] = SPACE;
735 cmd[1] = 0x01; /* Space FileMarks */
736 if (forward) {
737 cmd[2] = cmd[3] = 0;
738 cmd[4] = 1;
739 } else
740 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
741 cmd[5] = 0;
742
b30d8bca
HR		 743 DEBC_printk(STp, "Stepping over filemark %s.\n",
744 forward ? "forward" : "backward");
1da177e4 745
02ae2c0e
KM		 746 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
747 STp->device->request_queue->rq_timeout,
748 MAX_RETRIES, 1);
1da177e4 749 if (!SRpnt)
02ae2c0e 750 return (STp->buffer)->syscall_result;
39ade4b1 751
02ae2c0e
KM		 752 st_release_request(SRpnt);
753 SRpnt = NULL;
1da177e4
LT		 754
755 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 756 st_printk(KERN_ERR, STp,
757 "Stepping over filemark %s failed.\n",
758 forward ? "forward" : "backward");
1da177e4 759
02ae2c0e 760 return (STp->buffer)->syscall_result;
1da177e4
LT		 761}
762
763
764/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 765static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 766{
786231af 767 int transfer, blks;
1da177e4
LT		 768 int result;
769 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 770 struct st_request *SRpnt;
1da177e4
LT		 771 struct st_partstat *STps;
772
773 result = write_behind_check(STp);
774 if (result)
775 return result;
776
777 result = 0;
778 if (STp->dirty == 1) {
779
786231af 780 transfer = STp->buffer->buffer_bytes;
b30d8bca 781 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 782
1da177e4
LT		 783 memset(cmd, 0, MAX_COMMAND_SIZE);
784 cmd[0] = WRITE_6;
785 cmd[1] = 1;
786 blks = transfer / STp->block_size;
787 cmd[2] = blks >> 16;
788 cmd[3] = blks >> 8;
789 cmd[4] = blks;
790
791 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 792 STp->device->request_queue->rq_timeout,
793 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 794 if (!SRpnt)
795 return (STp->buffer)->syscall_result;
796
797 STps = &(STp->ps[STp->partition]);
798 if ((STp->buffer)->syscall_result != 0) {
799 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
800
801 if (cmdstatp->have_sense && !cmdstatp->deferred &&
802 (cmdstatp->flags & SENSE_EOM) &&
803 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
804 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
805 (!cmdstatp->remainder_valid ||
806 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
807 STp->dirty = 0;
808 (STp->buffer)->buffer_bytes = 0;
809 if (STps->drv_block >= 0)
810 STps->drv_block += blks;
811 result = (-ENOSPC);
812 } else {
b30d8bca 813 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 814 STps->drv_block = (-1);
815 result = (-EIO);
816 }
817 } else {
818 if (STps->drv_block >= 0)
819 STps->drv_block += blks;
820 STp->dirty = 0;
821 (STp->buffer)->buffer_bytes = 0;
822 }
8b05b773 823 st_release_request(SRpnt);
1da177e4
LT		 824 SRpnt = NULL;
825 }
826 return result;
827}
828
829
830/* Flush the tape buffer. The tape will be positioned correctly unless
831 seek_next is true. */
832static int flush_buffer(struct scsi_tape *STp, int seek_next)
833{
834 int backspace, result;
1da177e4
LT		 835 struct st_partstat *STps;
836
1da177e4
LT		 837 /*
838 * If there was a bus reset, block further access
839 * to this device.
840 */
841 if (STp->pos_unknown)
842 return (-EIO);
843
844 if (STp->ready != ST_READY)
845 return 0;
846 STps = &(STp->ps[STp->partition]);
847 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 848 return st_flush_write_buffer(STp);
1da177e4
LT		 849
850 if (STp->block_size == 0)
851 return 0;
852
853 backspace = ((STp->buffer)->buffer_bytes +
854 (STp->buffer)->read_pointer) / STp->block_size -
855 ((STp->buffer)->read_pointer + STp->block_size - 1) /
856 STp->block_size;
857 (STp->buffer)->buffer_bytes = 0;
858 (STp->buffer)->read_pointer = 0;
859 result = 0;
860 if (!seek_next) {
861 if (STps->eof == ST_FM_HIT) {
862 result = cross_eof(STp, 0); /* Back over the EOF hit */
863 if (!result)
864 STps->eof = ST_NOEOF;
865 else {
866 if (STps->drv_file >= 0)
867 STps->drv_file++;
868 STps->drv_block = 0;
869 }
870 }
871 if (!result && backspace > 0)
872 result = st_int_ioctl(STp, MTBSR, backspace);
873 } else if (STps->eof == ST_FM_HIT) {
874 if (STps->drv_file >= 0)
875 STps->drv_file++;
876 STps->drv_block = 0;
877 STps->eof = ST_NOEOF;
878 }
879 return result;
880
881}
882\f
883/* Set the mode parameters */
884static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
885{
886 int set_it = 0;
887 unsigned long arg;
1da177e4
LT		 888
889 if (!STp->density_changed &&
890 STm->default_density >= 0 &&
891 STm->default_density != STp->density) {
892 arg = STm->default_density;
893 set_it = 1;
894 } else
895 arg = STp->density;
896 arg <<= MT_ST_DENSITY_SHIFT;
897 if (!STp->blksize_changed &&
898 STm->default_blksize >= 0 &&
899 STm->default_blksize != STp->block_size) {
900 arg |= STm->default_blksize;
901 set_it = 1;
902 } else
903 arg |= STp->block_size;
904 if (set_it &&
905 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
b30d8bca
HR		 906 st_printk(KERN_WARNING, STp,
907 "Can't set default block size to %d bytes "
908 "and density %x.\n",
909 STm->default_blksize, STm->default_density);
1da177e4
LT		 910 if (modes_defined)
911 return (-EINVAL);
912 }
913 return 0;
914}
915
916
8b05b773 917/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 918static int do_door_lock(struct scsi_tape * STp, int do_lock)
919{
dccfa688 920 int retval;
1da177e4 921
b30d8bca 922 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
dccfa688
CH		 923
924 retval = scsi_set_medium_removal(STp->device,
925 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
926 if (!retval)
1da177e4 927 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
dccfa688 928 else
1da177e4 929 STp->door_locked = ST_LOCK_FAILS;
1da177e4
LT		 930 return retval;
931}
932
933
934/* Set the internal state after reset */
935static void reset_state(struct scsi_tape *STp)
936{
937 int i;
938 struct st_partstat *STps;
939
940 STp->pos_unknown = 0;
941 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
942 STps = &(STp->ps[i]);
943 STps->rw = ST_IDLE;
944 STps->eof = ST_NOEOF;
945 STps->at_sm = 0;
946 STps->last_block_valid = 0;
947 STps->drv_block = -1;
948 STps->drv_file = -1;
949 }
950 if (STp->can_partitions) {
951 STp->partition = find_partition(STp);
952 if (STp->partition < 0)
953 STp->partition = 0;
954 STp->new_partition = STp->partition;
955 }
956}
957\f
958/* Test if the drive is ready. Returns either one of the codes below or a negative system
959 error code. */
960#define CHKRES_READY 0
961#define CHKRES_NEW_SESSION 1
962#define CHKRES_NOT_READY 2
963#define CHKRES_NO_TAPE 3
964
965#define MAX_ATTENTIONS 10
966
967static int test_ready(struct scsi_tape *STp, int do_wait)
968{
969 int attentions, waits, max_wait, scode;
970 int retval = CHKRES_READY, new_session = 0;
971 unsigned char cmd[MAX_COMMAND_SIZE];
02ae2c0e 972 struct st_request *SRpnt = NULL;
1da177e4
LT		 973 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
974
975 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
976
977 for (attentions=waits=0; ; ) {
978 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
979 cmd[0] = TEST_UNIT_READY;
02ae2c0e
KM		 980 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
981 STp->long_timeout, MAX_READY_RETRIES, 1);
1da177e4 982
02ae2c0e
KM		 983 if (!SRpnt) {
984 retval = (STp->buffer)->syscall_result;
1da177e4 985 break;
02ae2c0e 986 }
1da177e4
LT		 987
988 if (cmdstatp->have_sense) {
989
990 scode = cmdstatp->sense_hdr.sense_key;
991
992 if (scode == UNIT_ATTENTION) { /* New media? */
993 new_session = 1;
994 if (attentions < MAX_ATTENTIONS) {
995 attentions++;
996 continue;
997 }
998 else {
999 retval = (-EIO);
1000 break;
1001 }
1002 }
1003
1004 if (scode == NOT_READY) {
1005 if (waits < max_wait) {
1006 if (msleep_interruptible(1000)) {
1007 retval = (-EINTR);
1008 break;
1009 }
1010 waits++;
1011 continue;
1012 }
1013 else {
1014 if ((STp->device)->scsi_level >= SCSI_2 &&
1015 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1016 retval = CHKRES_NO_TAPE;
1017 else
1018 retval = CHKRES_NOT_READY;
1019 break;
1020 }
1021 }
1022 }
1023
1024 retval = (STp->buffer)->syscall_result;
1025 if (!retval)
1026 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1027 break;
1028 }
1029
02ae2c0e
KM		 1030 if (SRpnt != NULL)
1031 st_release_request(SRpnt);
1da177e4
LT		 1032 return retval;
1033}
1034
1035
1036/* See if the drive is ready and gather information about the tape. Return values:
1037 < 0 negative error code from errno.h
1038 0 drive ready
1039 1 drive not ready (possibly no tape)
1040*/
1041static int check_tape(struct scsi_tape *STp, struct file *filp)
1042{
1043 int i, retval, new_session = 0, do_wait;
1044 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1045 unsigned short st_flags = filp->f_flags;
8b05b773 1046 struct st_request *SRpnt = NULL;
1da177e4
LT		 1047 struct st_modedef *STm;
1048 struct st_partstat *STps;
496ad9aa 1049 struct inode *inode = file_inode(filp);
1da177e4
LT		 1050 int mode = TAPE_MODE(inode);
1051
1052 STp->ready = ST_READY;
1053
1054 if (mode != STp->current_mode) {
b30d8bca
HR		 1055 DEBC_printk(STp, "Mode change from %d to %d.\n",
1056 STp->current_mode, mode);
1da177e4
LT		 1057 new_session = 1;
1058 STp->current_mode = mode;
1059 }
1060 STm = &(STp->modes[STp->current_mode]);
1061
1062 saved_cleaning = STp->cleaning_req;
1063 STp->cleaning_req = 0;
1064
1065 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1066 retval = test_ready(STp, do_wait);
1067
1068 if (retval < 0)
1069 goto err_out;
1070
1071 if (retval == CHKRES_NEW_SESSION) {
1072 STp->pos_unknown = 0;
1073 STp->partition = STp->new_partition = 0;
1074 if (STp->can_partitions)
1075 STp->nbr_partitions = 1; /* This guess will be updated later
1076 if necessary */
1077 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1078 STps = &(STp->ps[i]);
1079 STps->rw = ST_IDLE;
1080 STps->eof = ST_NOEOF;
1081 STps->at_sm = 0;
1082 STps->last_block_valid = 0;
1083 STps->drv_block = 0;
1084 STps->drv_file = 0;
1085 }
1086 new_session = 1;
1087 }
1088 else {
1089 STp->cleaning_req |= saved_cleaning;
1090
1091 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1092 if (retval == CHKRES_NO_TAPE)
1093 STp->ready = ST_NO_TAPE;
1094 else
1095 STp->ready = ST_NOT_READY;
1096
1097 STp->density = 0; /* Clear the erroneous "residue" */
1098 STp->write_prot = 0;
1099 STp->block_size = 0;
1100 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1101 STp->partition = STp->new_partition = 0;
1102 STp->door_locked = ST_UNLOCKED;
1103 return CHKRES_NOT_READY;
1104 }
1105 }
1106
1107 if (STp->omit_blklims)
1108 STp->min_block = STp->max_block = (-1);
1109 else {
1110 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1111 cmd[0] = READ_BLOCK_LIMITS;
1112
02ae2c0e
KM		 1113 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1114 STp->device->request_queue->rq_timeout,
1115 MAX_READY_RETRIES, 1);
1116 if (!SRpnt) {
1117 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1118 goto err_out;
1119 }
1120
8b05b773 1121 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1122 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1123 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1124 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1125 (STp->buffer)->b_data[5];
1126 if ( DEB( debugging || ) !STp->inited)
b30d8bca
HR		 1127 st_printk(KERN_INFO, STp,
1128 "Block limits %d - %d bytes.\n",
1129 STp->min_block, STp->max_block);
1da177e4
LT		 1130 } else {
1131 STp->min_block = STp->max_block = (-1);
b30d8bca 1132 DEBC_printk(STp, "Can't read block limits.\n");
1da177e4
LT		 1133 }
1134 }
1135
1136 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1137 cmd[0] = MODE_SENSE;
1138 cmd[4] = 12;
1139
02ae2c0e
KM		 1140 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1141 STp->device->request_queue->rq_timeout,
1142 MAX_READY_RETRIES, 1);
1143 if (!SRpnt) {
1144 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1145 goto err_out;
1146 }
1147
1148 if ((STp->buffer)->syscall_result != 0) {
b30d8bca 1149 DEBC_printk(STp, "No Mode Sense.\n");
1da177e4
LT		 1150 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1151 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1152 STp->drv_write_prot = 0;
1153 } else {
b30d8bca
HR		 1154 DEBC_printk(STp,"Mode sense. Length %d, "
1155 "medium %x, WBS %x, BLL %d\n",
1156 (STp->buffer)->b_data[0],
1157 (STp->buffer)->b_data[1],
1158 (STp->buffer)->b_data[2],
1159 (STp->buffer)->b_data[3]);
1da177e4
LT		 1160
1161 if ((STp->buffer)->b_data[3] >= 8) {
1162 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1163 STp->density = (STp->buffer)->b_data[4];
1164 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1165 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
b30d8bca
HR		 1166 DEBC_printk(STp, "Density %x, tape length: %x, "
1167 "drv buffer: %d\n",
1168 STp->density,
1169 (STp->buffer)->b_data[5] * 65536 +
1170 (STp->buffer)->b_data[6] * 256 +
1171 (STp->buffer)->b_data[7],
1172 STp->drv_buffer);
1da177e4
LT		 1173 }
1174 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
c743e44f 1175 if (!STp->drv_buffer && STp->immediate_filemark) {
b30d8bca
HR		 1176 st_printk(KERN_WARNING, STp,
1177 "non-buffered tape: disabling "
1178 "writing immediate filemarks\n");
c743e44f
LD		 1179 STp->immediate_filemark = 0;
1180 }
1da177e4 1181 }
8b05b773 1182 st_release_request(SRpnt);
1da177e4 1183 SRpnt = NULL;
b30d8bca 1184 STp->inited = 1;
1da177e4
LT		 1185
1186 if (STp->block_size > 0)
1187 (STp->buffer)->buffer_blocks =
b30d8bca 1188 (STp->buffer)->buffer_size / STp->block_size;
1da177e4
LT		 1189 else
1190 (STp->buffer)->buffer_blocks = 1;
1191 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1192
b30d8bca
HR		 1193 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1194 STp->block_size, (STp->buffer)->buffer_size,
1195 (STp->buffer)->buffer_blocks);
1da177e4
LT		 1196
1197 if (STp->drv_write_prot) {
1198 STp->write_prot = 1;
1199
b30d8bca 1200 DEBC_printk(STp, "Write protected\n");
1da177e4
LT		 1201
1202 if (do_wait &&
1203 ((st_flags & O_ACCMODE) == O_WRONLY ||
1204 (st_flags & O_ACCMODE) == O_RDWR)) {
1205 retval = (-EROFS);
1206 goto err_out;
1207 }
1208 }
1209
1210 if (STp->can_partitions && STp->nbr_partitions < 1) {
1211 /* This code is reached when the device is opened for the first time
1212 after the driver has been initialized with tape in the drive and the
1213 partition support has been enabled. */
b30d8bca 1214 DEBC_printk(STp, "Updating partition number in status.\n");
1da177e4
LT		 1215 if ((STp->partition = find_partition(STp)) < 0) {
1216 retval = STp->partition;
1217 goto err_out;
1218 }
1219 STp->new_partition = STp->partition;
1220 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1221 }
1222
1223 if (new_session) { /* Change the drive parameters for the new mode */
1224 STp->density_changed = STp->blksize_changed = 0;
1225 STp->compression_changed = 0;
1226 if (!(STm->defaults_for_writes) &&
1227 (retval = set_mode_densblk(STp, STm)) < 0)
1228 goto err_out;
1229
1230 if (STp->default_drvbuffer != 0xff) {
1231 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
b30d8bca
HR		 1232 st_printk(KERN_WARNING, STp,
1233 "Can't set default drive "
1234 "buffering to %d.\n",
1235 STp->default_drvbuffer);
1da177e4
LT		 1236 }
1237 }
1238
1239 return CHKRES_READY;
1240
1241 err_out:
1242 return retval;
1243}
1244
1245
b3369c68 1246\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1247 module count. */
1248static int st_open(struct inode *inode, struct file *filp)
1249{
1250 int i, retval = (-EIO);
46a243f7 1251 int resumed = 0;
1da177e4
LT		 1252 struct scsi_tape *STp;
1253 struct st_partstat *STps;
1254 int dev = TAPE_NR(inode);
1da177e4
LT		 1255
1256 /*
1257 * We really want to do nonseekable_open(inode, filp); here, but some
1258 * versions of tar incorrectly call lseek on tapes and bail out if that
1259 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1260 */
1261 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1262
b3369c68 1263 if (!(STp = scsi_tape_get(dev))) {
f03a5670 1264 return -ENXIO;
b3369c68 1265 }
f03a5670 1266
1da177e4 1267 filp->private_data = STp;
1da177e4 1268
6c648d95 1269 spin_lock(&st_use_lock);
1da177e4 1270 if (STp->in_use) {
6c648d95 1271 spin_unlock(&st_use_lock);
f03a5670 1272 scsi_tape_put(STp);
b30d8bca 1273 DEBC_printk(STp, "Device already in use.\n");
1da177e4
LT		 1274 return (-EBUSY);
1275 }
1276
1da177e4 1277 STp->in_use = 1;
6c648d95 1278 spin_unlock(&st_use_lock);
1da177e4
LT		 1279 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1280
46a243f7
ON		 1281 if (scsi_autopm_get_device(STp->device) < 0) {
1282 retval = -EIO;
1283 goto err_out;
1284 }
1285 resumed = 1;
1da177e4
LT		 1286 if (!scsi_block_when_processing_errors(STp->device)) {
1287 retval = (-ENXIO);
1288 goto err_out;
1289 }
1290
1291 /* See that we have at least a one page buffer available */
1292 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
b30d8bca
HR		 1293 st_printk(KERN_WARNING, STp,
1294 "Can't allocate one page tape buffer.\n");
1da177e4
LT		 1295 retval = (-EOVERFLOW);
1296 goto err_out;
1297 }
1298
40f6b36c 1299 (STp->buffer)->cleared = 0;
1da177e4
LT		 1300 (STp->buffer)->writing = 0;
1301 (STp->buffer)->syscall_result = 0;
1302
1303 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1304
1305 STp->dirty = 0;
1306 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1307 STps = &(STp->ps[i]);
1308 STps->rw = ST_IDLE;
1309 }
9abe16c6 1310 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1311 STp->recover_count = 0;
1312 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1313 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1314
1315 retval = check_tape(STp, filp);
1316 if (retval < 0)
1317 goto err_out;
1318 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1319 retval != CHKRES_READY) {
413f7327
KM		 1320 if (STp->ready == NO_TAPE)
1321 retval = (-ENOMEDIUM);
1322 else
1323 retval = (-EIO);
1da177e4
LT		 1324 goto err_out;
1325 }
1326 return 0;
1327
1328 err_out:
1329 normalize_buffer(STp->buffer);
0644f539 1330 spin_lock(&st_use_lock);
1da177e4 1331 STp->in_use = 0;
0644f539 1332 spin_unlock(&st_use_lock);
46a243f7
ON		 1333 if (resumed)
1334 scsi_autopm_put_device(STp->device);
e7ac6c66 1335 scsi_tape_put(STp);
1da177e4
LT		 1336 return retval;
1337
1338}
1339\f
1340
1341/* Flush the tape buffer before close */
75e1fcc0 1342static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1343{
1344 int result = 0, result2;
1345 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1346 struct st_request *SRpnt;
1da177e4
LT		 1347 struct scsi_tape *STp = filp->private_data;
1348 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1349 struct st_partstat *STps = &(STp->ps[STp->partition]);
1da177e4
LT		 1350
1351 if (file_count(filp) > 1)
1352 return 0;
1353
1354 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1355 result = st_flush_write_buffer(STp);
1da177e4
LT		 1356 if (result != 0 && result != (-ENOSPC))
1357 goto out;
1358 }
1359
1360 if (STp->can_partitions &&
1361 (result2 = switch_partition(STp)) < 0) {
b30d8bca 1362 DEBC_printk(STp, "switch_partition at close failed.\n");
1da177e4
LT		 1363 if (result == 0)
1364 result = result2;
1365 goto out;
1366 }
1367
1368 DEBC( if (STp->nbr_requests)
b30d8bca
HR		 1369 st_printk(KERN_DEBUG, STp,
1370 "Number of r/w requests %d, dio used in %d, "
1371 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1372 STp->nbr_pages));
1da177e4
LT		 1373
1374 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1375 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1376
b30d8bca
HR		 1377#if DEBUG
1378 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1379 STp->nbr_waits, STp->nbr_finished);
1380#endif
1da177e4
LT		 1381 memset(cmd, 0, MAX_COMMAND_SIZE);
1382 cmd[0] = WRITE_FILEMARKS;
c743e44f
LD		 1383 if (STp->immediate_filemark)
1384 cmd[1] = 1;
1da177e4
LT		 1385 cmd[4] = 1 + STp->two_fm;
1386
02ae2c0e
KM		 1387 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1388 STp->device->request_queue->rq_timeout,
1389 MAX_WRITE_RETRIES, 1);
1da177e4 1390 if (!SRpnt) {
02ae2c0e 1391 result = (STp->buffer)->syscall_result;
1da177e4
LT		 1392 goto out;
1393 }
1394
1395 if (STp->buffer->syscall_result == 0 ||
1396 (cmdstatp->have_sense && !cmdstatp->deferred &&
1397 (cmdstatp->flags & SENSE_EOM) &&
1398 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1399 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1400 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1401 /* Write successful at EOM */
8b05b773 1402 st_release_request(SRpnt);
1da177e4
LT		 1403 SRpnt = NULL;
1404 if (STps->drv_file >= 0)
1405 STps->drv_file++;
1406 STps->drv_block = 0;
1407 if (STp->two_fm)
1408 cross_eof(STp, 0);
1409 STps->eof = ST_FM;
1410 }
1411 else { /* Write error */
8b05b773 1412 st_release_request(SRpnt);
1da177e4 1413 SRpnt = NULL;
b30d8bca
HR		 1414 st_printk(KERN_ERR, STp,
1415 "Error on write filemark.\n");
1da177e4
LT		 1416 if (result == 0)
1417 result = (-EIO);
1418 }
1419
b30d8bca 1420 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1da177e4
LT		 1421 } else if (!STp->rew_at_close) {
1422 STps = &(STp->ps[STp->partition]);
1423 if (!STm->sysv || STps->rw != ST_READING) {
1424 if (STp->can_bsr)
1425 result = flush_buffer(STp, 0);
1426 else if (STps->eof == ST_FM_HIT) {
1427 result = cross_eof(STp, 0);
1428 if (result) {
1429 if (STps->drv_file >= 0)
1430 STps->drv_file++;
1431 STps->drv_block = 0;
1432 STps->eof = ST_FM;
1433 } else
1434 STps->eof = ST_NOEOF;
1435 }
1436 } else if ((STps->eof == ST_NOEOF &&
1437 !(result = cross_eof(STp, 1))) ||
1438 STps->eof == ST_FM_HIT) {
1439 if (STps->drv_file >= 0)
1440 STps->drv_file++;
1441 STps->drv_block = 0;
1442 STps->eof = ST_FM;
1443 }
1444 }
1445
1446 out:
1447 if (STp->rew_at_close) {
1448 result2 = st_int_ioctl(STp, MTREW, 1);
1449 if (result == 0)
1450 result = result2;
1451 }
1452 return result;
1453}
1454
1455
1456/* Close the device and release it. BKL is not needed: this is the only thread
1457 accessing this tape. */
1458static int st_release(struct inode *inode, struct file *filp)
1459{
1da177e4
LT		 1460 struct scsi_tape *STp = filp->private_data;
1461
1462 if (STp->door_locked == ST_LOCKED_AUTO)
1463 do_door_lock(STp, 0);
1464
1465 normalize_buffer(STp->buffer);
6c648d95 1466 spin_lock(&st_use_lock);
1da177e4 1467 STp->in_use = 0;
6c648d95 1468 spin_unlock(&st_use_lock);
46a243f7 1469 scsi_autopm_put_device(STp->device);
f03a5670 1470 scsi_tape_put(STp);
1da177e4 1471
ec341439 1472 return 0;
1da177e4 1473}
ec341439 1474
1da177e4
LT		 1475/* The checks common to both reading and writing */
1476static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1477{
1478 ssize_t retval = 0;
1479
1480 /*
1481 * If we are in the middle of error recovery, don't let anyone
1482 * else try and use this device. Also, if error recovery fails, it
1483 * may try and take the device offline, in which case all further
1484 * access to the device is prohibited.
1485 */
1486 if (!scsi_block_when_processing_errors(STp->device)) {
1487 retval = (-ENXIO);
1488 goto out;
1489 }
1490
1491 if (STp->ready != ST_READY) {
1492 if (STp->ready == ST_NO_TAPE)
1493 retval = (-ENOMEDIUM);
1494 else
1495 retval = (-EIO);
1496 goto out;
1497 }
1498
1499 if (! STp->modes[STp->current_mode].defined) {
1500 retval = (-ENXIO);
1501 goto out;
1502 }
1503
1504
1505 /*
1506 * If there was a bus reset, block further access
1507 * to this device.
1508 */
1509 if (STp->pos_unknown) {
1510 retval = (-EIO);
1511 goto out;
1512 }
1513
1514 if (count == 0)
1515 goto out;
1516
b30d8bca 1517 DEB(
1da177e4 1518 if (!STp->in_use) {
b30d8bca
HR		 1519 st_printk(ST_DEB_MSG, STp,
1520 "Incorrect device.\n");
1da177e4
LT		 1521 retval = (-EIO);
1522 goto out;
1523 } ) /* end DEB */
1524
1525 if (STp->can_partitions &&
1526 (retval = switch_partition(STp)) < 0)
1527 goto out;
1528
1529 if (STp->block_size == 0 && STp->max_block > 0 &&
1530 (count < STp->min_block || count > STp->max_block)) {
1531 retval = (-EINVAL);
1532 goto out;
1533 }
1534
1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1536 !do_door_lock(STp, 1))
1537 STp->door_locked = ST_LOCKED_AUTO;
1538
1539 out:
1540 return retval;
1541}
1542
1543
1544static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1545 size_t count, int is_read)
1546{
1547 int i, bufsize, retval = 0;
1548 struct st_buffer *STbp = STp->buffer;
1549
1550 if (is_read)
9abe16c6 1551 i = STp->try_dio_now && try_rdio;
1da177e4 1552 else
9abe16c6 1553 i = STp->try_dio_now && try_wdio;
8b05b773 1554
1da177e4
LT		 1555 if (i && ((unsigned long)buf & queue_dma_alignment(
1556 STp->device->request_queue)) == 0) {
6620742f
FT		 1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1558 count, (is_read ? READ : WRITE));
1da177e4
LT		 1559 if (i > 0) {
1560 STbp->do_dio = i;
1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1562 }
1563 else
1564 STbp->do_dio = 0; /* fall back to buffering with any error */
1565 STbp->sg_segs = STbp->do_dio;
1da177e4
LT		 1566 DEB(
1567 if (STbp->do_dio) {
1568 STp->nbr_dio++;
1569 STp->nbr_pages += STbp->do_dio;
1da177e4
LT		 1570 }
1571 )
1572 } else
1573 STbp->do_dio = 0;
1574 DEB( STp->nbr_requests++; )
1575
1576 if (!STbp->do_dio) {
1577 if (STp->block_size)
1578 bufsize = STp->block_size > st_fixed_buffer_size ?
1579 STp->block_size : st_fixed_buffer_size;
40f6b36c 1580 else {
1da177e4 1581 bufsize = count;
40f6b36c
KM		 1582 /* Make sure that data from previous user is not leaked even if
1583 HBA does not return correct residual */
1584 if (is_read && STp->sili && !STbp->cleared)
1585 clear_buffer(STbp);
1586 }
1587
1da177e4
LT		 1588 if (bufsize > STbp->buffer_size &&
1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
b30d8bca
HR		 1590 st_printk(KERN_WARNING, STp,
1591 "Can't allocate %d byte tape buffer.\n",
1592 bufsize);
1da177e4
LT		 1593 retval = (-EOVERFLOW);
1594 goto out;
1595 }
1596 if (STp->block_size)
1597 STbp->buffer_blocks = bufsize / STp->block_size;
1598 }
1599
1600 out:
1601 return retval;
1602}
1603
1604
1605/* Can be called more than once after each setup_buffer() */
787926b1 1606static void release_buffering(struct scsi_tape *STp, int is_read)
1da177e4
LT		 1607{
1608 struct st_buffer *STbp;
1609
1610 STbp = STp->buffer;
1611 if (STbp->do_dio) {
6620742f 1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1da177e4 1613 STbp->do_dio = 0;
787926b1 1614 STbp->sg_segs = 0;
1da177e4
LT		 1615 }
1616}
1617
1618
1619/* Write command */
1620static ssize_t
1621st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1622{
1623 ssize_t total;
1624 ssize_t i, do_count, blks, transfer;
1625 ssize_t retval;
1626 int undone, retry_eot = 0, scode;
1627 int async_write;
1628 unsigned char cmd[MAX_COMMAND_SIZE];
1629 const char __user *b_point;
8b05b773 1630 struct st_request *SRpnt = NULL;
1da177e4
LT		 1631 struct scsi_tape *STp = filp->private_data;
1632 struct st_modedef *STm;
1633 struct st_partstat *STps;
1634 struct st_buffer *STbp;
1da177e4 1635
28f85009 1636 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 1637 return -ERESTARTSYS;
1638
1639 retval = rw_checks(STp, filp, count);
1640 if (retval || count == 0)
1641 goto out;
1642
1643 /* Write must be integral number of blocks */
1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
b30d8bca
HR		 1645 st_printk(KERN_WARNING, STp,
1646 "Write not multiple of tape block size.\n");
1da177e4
LT		 1647 retval = (-EINVAL);
1648 goto out;
1649 }
1650
1651 STm = &(STp->modes[STp->current_mode]);
1652 STps = &(STp->ps[STp->partition]);
1653
1654 if (STp->write_prot) {
1655 retval = (-EACCES);
1656 goto out;
1657 }
1658
1659
1660 if (STps->rw == ST_READING) {
1661 retval = flush_buffer(STp, 0);
1662 if (retval)
1663 goto out;
1664 STps->rw = ST_WRITING;
1665 } else if (STps->rw != ST_WRITING &&
1666 STps->drv_file == 0 && STps->drv_block == 0) {
1667 if ((retval = set_mode_densblk(STp, STm)) < 0)
1668 goto out;
1669 if (STm->default_compression != ST_DONT_TOUCH &&
1670 !(STp->compression_changed)) {
1671 if (st_compression(STp, (STm->default_compression == ST_YES))) {
b30d8bca
HR		 1672 st_printk(KERN_WARNING, STp,
1673 "Can't set default compression.\n");
1da177e4
LT		 1674 if (modes_defined) {
1675 retval = (-EINVAL);
1676 goto out;
1677 }
1678 }
1679 }
1680 }
1681
1682 STbp = STp->buffer;
1683 i = write_behind_check(STp);
1684 if (i) {
1685 if (i == -ENOSPC)
1686 STps->eof = ST_EOM_OK;
1687 else
1688 STps->eof = ST_EOM_ERROR;
1689 }
1690
1691 if (STps->eof == ST_EOM_OK) {
1692 STps->eof = ST_EOD_1; /* allow next write */
1693 retval = (-ENOSPC);
1694 goto out;
1695 }
1696 else if (STps->eof == ST_EOM_ERROR) {
1697 retval = (-EIO);
1698 goto out;
1699 }
1700
1701 /* Check the buffer readability in cases where copy_user might catch
1702 the problems after some tape movement. */
1703 if (STp->block_size != 0 &&
1704 !STbp->do_dio &&
1705 (copy_from_user(&i, buf, 1) != 0 ||
1706 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1707 retval = (-EFAULT);
1708 goto out;
1709 }
1710
1711 retval = setup_buffering(STp, buf, count, 0);
1712 if (retval)
1713 goto out;
1714
1715 total = count;
1716
1717 memset(cmd, 0, MAX_COMMAND_SIZE);
1718 cmd[0] = WRITE_6;
1719 cmd[1] = (STp->block_size != 0);
1720
1721 STps->rw = ST_WRITING;
1722
1723 b_point = buf;
1724 while (count > 0 && !retry_eot) {
1725
1726 if (STbp->do_dio) {
1727 do_count = count;
1728 }
1729 else {
1730 if (STp->block_size == 0)
1731 do_count = count;
1732 else {
1733 do_count = STbp->buffer_blocks * STp->block_size -
1734 STbp->buffer_bytes;
1735 if (do_count > count)
1736 do_count = count;
1737 }
1738
1739 i = append_to_buffer(b_point, STbp, do_count);
1740 if (i) {
1741 retval = i;
1742 goto out;
1743 }
1744 }
1745 count -= do_count;
1746 b_point += do_count;
1747
1748 async_write = STp->block_size == 0 && !STbp->do_dio &&
1749 STm->do_async_writes && STps->eof < ST_EOM_OK;
1750
1751 if (STp->block_size != 0 && STm->do_buffer_writes &&
9abe16c6 1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1da177e4
LT		 1753 STbp->buffer_bytes < STbp->buffer_size) {
1754 STp->dirty = 1;
1755 /* Don't write a buffer that is not full enough. */
1756 if (!async_write && count == 0)
1757 break;
1758 }
1759
1760 retry_write:
1761 if (STp->block_size == 0)
1762 blks = transfer = do_count;
1763 else {
1764 if (!STbp->do_dio)
1765 blks = STbp->buffer_bytes;
1766 else
1767 blks = do_count;
1768 blks /= STp->block_size;
1769 transfer = blks * STp->block_size;
1770 }
1771 cmd[2] = blks >> 16;
1772 cmd[3] = blks >> 8;
1773 cmd[4] = blks;
1774
1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 1776 STp->device->request_queue->rq_timeout,
1777 MAX_WRITE_RETRIES, !async_write);
1da177e4
LT		 1778 if (!SRpnt) {
1779 retval = STbp->syscall_result;
1780 goto out;
1781 }
8b05b773 1782 if (async_write && !STbp->syscall_result) {
1da177e4
LT		 1783 STbp->writing = transfer;
1784 STp->dirty = !(STbp->writing ==
1785 STbp->buffer_bytes);
1786 SRpnt = NULL; /* Prevent releasing this request! */
1787 DEB( STp->write_pending = 1; )
1788 break;
1789 }
1790
1791 if (STbp->syscall_result != 0) {
1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1793
b30d8bca 1794 DEBC_printk(STp, "Error on write:\n");
1da177e4
LT		 1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1796 scode = cmdstatp->sense_hdr.sense_key;
1797 if (cmdstatp->remainder_valid)
1798 undone = (int)cmdstatp->uremainder64;
1799 else if (STp->block_size == 0 &&
1800 scode == VOLUME_OVERFLOW)
1801 undone = transfer;
1802 else
1803 undone = 0;
1804 if (STp->block_size != 0)
1805 undone *= STp->block_size;
1806 if (undone <= do_count) {
1807 /* Only data from this write is not written */
1808 count += undone;
626dcb1e 1809 b_point -= undone;
1da177e4
LT		 1810 do_count -= undone;
1811 if (STp->block_size)
1812 blks = (transfer - undone) / STp->block_size;
1813 STps->eof = ST_EOM_OK;
1814 /* Continue in fixed block mode if all written
1815 in this request but still something left to write
1816 (retval left to zero)
1817 */
1818 if (STp->block_size == 0 ||
1819 undone > 0 || count == 0)
1820 retval = (-ENOSPC); /* EOM within current request */
b30d8bca
HR		 1821 DEBC_printk(STp, "EOM with %d "
1822 "bytes unwritten.\n",
1823 (int)count);
1da177e4
LT		 1824 } else {
1825 /* EOT within data buffered earlier (possible only
1826 in fixed block mode without direct i/o) */
1827 if (!retry_eot && !cmdstatp->deferred &&
1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1829 move_buffer_data(STp->buffer, transfer - undone);
1830 retry_eot = 1;
1831 if (STps->drv_block >= 0) {
1832 STps->drv_block += (transfer - undone) /
1833 STp->block_size;
1834 }
1835 STps->eof = ST_EOM_OK;
b30d8bca
HR		 1836 DEBC_printk(STp, "Retry "
1837 "write of %d "
1838 "bytes at EOM.\n",
1839 STp->buffer->buffer_bytes);
1da177e4
LT		 1840 goto retry_write;
1841 }
1842 else {
1843 /* Either error within data buffered by driver or
1844 failed retry */
1845 count -= do_count;
1846 blks = do_count = 0;
1847 STps->eof = ST_EOM_ERROR;
1848 STps->drv_block = (-1); /* Too cautious? */
1849 retval = (-EIO); /* EOM for old data */
b30d8bca
HR		 1850 DEBC_printk(STp, "EOM with "
1851 "lost data.\n");
1da177e4
LT		 1852 }
1853 }
1854 } else {
1855 count += do_count;
1856 STps->drv_block = (-1); /* Too cautious? */
8b05b773 1857 retval = STbp->syscall_result;
1da177e4
LT		 1858 }
1859
1860 }
1861
1862 if (STps->drv_block >= 0) {
1863 if (STp->block_size == 0)
1864 STps->drv_block += (do_count > 0);
1865 else
1866 STps->drv_block += blks;
1867 }
1868
1869 STbp->buffer_bytes = 0;
1870 STp->dirty = 0;
1871
1872 if (retval || retry_eot) {
1873 if (count < total)
1874 retval = total - count;
1875 goto out;
1876 }
1877 }
1878
1879 if (STps->eof == ST_EOD_1)
1880 STps->eof = ST_EOM_OK;
1881 else if (STps->eof != ST_EOM_OK)
1882 STps->eof = ST_NOEOF;
1883 retval = total - count;
1884
1885 out:
1886 if (SRpnt != NULL)
8b05b773 1887 st_release_request(SRpnt);
787926b1 1888 release_buffering(STp, 0);
28f85009 1889 mutex_unlock(&STp->lock);
1da177e4
LT		 1890
1891 return retval;
1892}
1893\f
1894/* Read data from the tape. Returns zero in the normal case, one if the
1895 eof status has changed, and the negative error code in case of a
1896 fatal error. Otherwise updates the buffer and the eof state.
1897
1898 Does release user buffer mapping if it is set.
1899*/
1900static long read_tape(struct scsi_tape *STp, long count,
8b05b773 1901 struct st_request ** aSRpnt)
1da177e4
LT		 1902{
1903 int transfer, blks, bytes;
1904 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1905 struct st_request *SRpnt;
1da177e4
LT		 1906 struct st_modedef *STm;
1907 struct st_partstat *STps;
1908 struct st_buffer *STbp;
1909 int retval = 0;
1da177e4
LT		 1910
1911 if (count == 0)
1912 return 0;
1913
1914 STm = &(STp->modes[STp->current_mode]);
1915 STps = &(STp->ps[STp->partition]);
1916 if (STps->eof == ST_FM_HIT)
1917 return 1;
1918 STbp = STp->buffer;
1919
1920 if (STp->block_size == 0)
1921 blks = bytes = count;
1922 else {
9abe16c6 1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1da177e4
LT		 1924 blks = (STp->buffer)->buffer_blocks;
1925 bytes = blks * STp->block_size;
1926 } else {
1927 bytes = count;
1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1929 bytes = (STp->buffer)->buffer_size;
1930 blks = bytes / STp->block_size;
1931 bytes = blks * STp->block_size;
1932 }
1933 }
1934
1935 memset(cmd, 0, MAX_COMMAND_SIZE);
1936 cmd[0] = READ_6;
1937 cmd[1] = (STp->block_size != 0);
40f6b36c
KM		 1938 if (!cmd[1] && STp->sili)
1939 cmd[1] |= 2;
1da177e4
LT		 1940 cmd[2] = blks >> 16;
1941 cmd[3] = blks >> 8;
1942 cmd[4] = blks;
1943
1944 SRpnt = *aSRpnt;
1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
a02488ed
JB		 1946 STp->device->request_queue->rq_timeout,
1947 MAX_RETRIES, 1);
787926b1 1948 release_buffering(STp, 1);
1da177e4
LT		 1949 *aSRpnt = SRpnt;
1950 if (!SRpnt)
1951 return STbp->syscall_result;
1952
1953 STbp->read_pointer = 0;
1954 STps->at_sm = 0;
1955
1956 /* Something to check */
1957 if (STbp->syscall_result) {
1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1959
1960 retval = 1;
b30d8bca
HR		 1961 DEBC_printk(STp,
1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1963 SRpnt->sense[0], SRpnt->sense[1],
1964 SRpnt->sense[2], SRpnt->sense[3],
1965 SRpnt->sense[4], SRpnt->sense[5],
1966 SRpnt->sense[6], SRpnt->sense[7]);
1da177e4
LT		 1967 if (cmdstatp->have_sense) {
1968
1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1971
1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1973 /* Compute the residual count */
1974 if (cmdstatp->remainder_valid)
1975 transfer = (int)cmdstatp->uremainder64;
1976 else
1977 transfer = 0;
5e4fabb6
KM		 1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1979 if (STp->block_size == 0)
1980 transfer = bytes;
1981 /* Some drives set ILI with MEDIUM ERROR */
1982 cmdstatp->flags &= ~SENSE_ILI;
1983 }
1da177e4
LT		 1984
1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
b30d8bca
HR		 1986 if (STp->block_size == 0 &&
1987 transfer < 0) {
1988 st_printk(KERN_NOTICE, STp,
1989 "Failed to read %d "
1990 "byte block with %d "
1991 "byte transfer.\n",
1992 bytes - transfer,
1993 bytes);
1994 if (STps->drv_block >= 0)
1995 STps->drv_block += 1;
1996 STbp->buffer_bytes = 0;
1997 return (-ENOMEM);
1998 } else if (STp->block_size == 0) {
1da177e4
LT		 1999 STbp->buffer_bytes = bytes - transfer;
2000 } else {
8b05b773 2001 st_release_request(SRpnt);
1da177e4
LT		 2002 SRpnt = *aSRpnt = NULL;
2003 if (transfer == blks) { /* We did not get anything, error */
b30d8bca
HR		 2004 st_printk(KERN_NOTICE, STp,
2005 "Incorrect "
2006 "block size.\n");
1da177e4
LT		 2007 if (STps->drv_block >= 0)
2008 STps->drv_block += blks - transfer + 1;
2009 st_int_ioctl(STp, MTBSR, 1);
2010 return (-EIO);
2011 }
2012 /* We have some data, deliver it */
2013 STbp->buffer_bytes = (blks - transfer) *
2014 STp->block_size;
b30d8bca
HR		 2015 DEBC_printk(STp, "ILI but "
2016 "enough data "
2017 "received %ld "
2018 "%d.\n", count,
2019 STbp->buffer_bytes);
1da177e4
LT		 2020 if (STps->drv_block >= 0)
2021 STps->drv_block += 1;
2022 if (st_int_ioctl(STp, MTBSR, 1))
2023 return (-EIO);
2024 }
2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2026 if (STps->eof != ST_FM_HIT)
2027 STps->eof = ST_FM_HIT;
2028 else
2029 STps->eof = ST_EOD_2;
2030 if (STp->block_size == 0)
2031 STbp->buffer_bytes = 0;
2032 else
2033 STbp->buffer_bytes =
2034 bytes - transfer * STp->block_size;
b30d8bca
HR		 2035 DEBC_printk(STp, "EOF detected (%d "
2036 "bytes read).\n",
2037 STbp->buffer_bytes);
1da177e4
LT		 2038 } else if (cmdstatp->flags & SENSE_EOM) {
2039 if (STps->eof == ST_FM)
2040 STps->eof = ST_EOD_1;
2041 else
2042 STps->eof = ST_EOM_OK;
2043 if (STp->block_size == 0)
2044 STbp->buffer_bytes = bytes - transfer;
2045 else
2046 STbp->buffer_bytes =
2047 bytes - transfer * STp->block_size;
2048
b30d8bca
HR		 2049 DEBC_printk(STp, "EOM detected (%d "
2050 "bytes read).\n",
2051 STbp->buffer_bytes);
1da177e4
LT		 2052 }
2053 }
b30d8bca 2054 /* end of EOF, EOM, ILI test */
1da177e4 2055 else { /* nonzero sense key */
b30d8bca 2056 DEBC_printk(STp, "Tape error while reading.\n");
1da177e4
LT		 2057 STps->drv_block = (-1);
2058 if (STps->eof == ST_FM &&
2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
b30d8bca
HR		 2060 DEBC_printk(STp, "Zero returned for "
2061 "first BLANK CHECK "
2062 "after EOF.\n");
1da177e4
LT		 2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2064 } else /* Some other extended sense code */
2065 retval = (-EIO);
2066 }
2067
2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2069 STbp->buffer_bytes = 0;
2070 }
b30d8bca 2071 /* End of extended sense test */
1da177e4
LT		 2072 else { /* Non-extended sense */
2073 retval = STbp->syscall_result;
2074 }
2075
2076 }
b30d8bca 2077 /* End of error handling */
40f6b36c 2078 else { /* Read successful */
1da177e4 2079 STbp->buffer_bytes = bytes;
40f6b36c
KM		 2080 if (STp->sili) /* In fixed block mode residual is always zero here */
2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2082 }
1da177e4
LT		 2083
2084 if (STps->drv_block >= 0) {
2085 if (STp->block_size == 0)
2086 STps->drv_block++;
2087 else
2088 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2089 }
2090 return retval;
2091}
2092\f
2093
2094/* Read command */
2095static ssize_t
2096st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2097{
2098 ssize_t total;
2099 ssize_t retval = 0;
2100 ssize_t i, transfer;
2101 int special, do_dio = 0;
8b05b773 2102 struct st_request *SRpnt = NULL;
1da177e4
LT		 2103 struct scsi_tape *STp = filp->private_data;
2104 struct st_modedef *STm;
2105 struct st_partstat *STps;
2106 struct st_buffer *STbp = STp->buffer;
1da177e4 2107
28f85009 2108 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2109 return -ERESTARTSYS;
2110
2111 retval = rw_checks(STp, filp, count);
2112 if (retval || count == 0)
2113 goto out;
2114
2115 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2117 if (!STm->do_read_ahead) {
2118 retval = (-EINVAL); /* Read must be integral number of blocks */
2119 goto out;
2120 }
2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2122 }
2123
2124 STps = &(STp->ps[STp->partition]);
2125 if (STps->rw == ST_WRITING) {
2126 retval = flush_buffer(STp, 0);
2127 if (retval)
2128 goto out;
2129 STps->rw = ST_READING;
2130 }
b30d8bca 2131 DEB(
1da177e4 2132 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2133 st_printk(ST_DEB_MSG, STp,
2134 "EOF/EOM flag up (%d). Bytes %d\n",
2135 STps->eof, STbp->buffer_bytes);
2136 ) /* end DEB */
1da177e4
LT		 2137
2138 retval = setup_buffering(STp, buf, count, 1);
2139 if (retval)
2140 goto out;
2141 do_dio = STbp->do_dio;
2142
2143 if (STbp->buffer_bytes == 0 &&
2144 STps->eof >= ST_EOD_1) {
2145 if (STps->eof < ST_EOD) {
2146 STps->eof += 1;
2147 retval = 0;
2148 goto out;
2149 }
2150 retval = (-EIO); /* EOM or Blank Check */
2151 goto out;
2152 }
2153
2154 if (do_dio) {
2155 /* Check the buffer writability before any tape movement. Don't alter
2156 buffer data. */
2157 if (copy_from_user(&i, buf, 1) != 0 ||
2158 copy_to_user(buf, &i, 1) != 0 ||
2159 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2160 copy_to_user(buf + count - 1, &i, 1) != 0) {
2161 retval = (-EFAULT);
2162 goto out;
2163 }
2164 }
2165
2166 STps->rw = ST_READING;
2167
2168
2169 /* Loop until enough data in buffer or a special condition found */
2170 for (total = 0, special = 0; total < count && !special;) {
2171
2172 /* Get new data if the buffer is empty */
2173 if (STbp->buffer_bytes == 0) {
2174 special = read_tape(STp, count - total, &SRpnt);
2175 if (special < 0) { /* No need to continue read */
2176 retval = special;
2177 goto out;
2178 }
2179 }
2180
2181 /* Move the data from driver buffer to user buffer */
2182 if (STbp->buffer_bytes > 0) {
b30d8bca 2183 DEB(
1da177e4 2184 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2185 st_printk(ST_DEB_MSG, STp,
2186 "EOF up (%d). Left %d, needed %d.\n",
2187 STps->eof, STbp->buffer_bytes,
2188 (int)(count - total));
2189 ) /* end DEB */
1da177e4
LT		 2190 transfer = STbp->buffer_bytes < count - total ?
2191 STbp->buffer_bytes : count - total;
2192 if (!do_dio) {
2193 i = from_buffer(STbp, buf, transfer);
2194 if (i) {
2195 retval = i;
2196 goto out;
2197 }
2198 }
2199 buf += transfer;
2200 total += transfer;
2201 }
2202
2203 if (STp->block_size == 0)
2204 break; /* Read only one variable length block */
2205
2206 } /* for (total = 0, special = 0;
2207 total < count && !special; ) */
2208
2209 /* Change the eof state if no data from tape or buffer */
2210 if (total == 0) {
2211 if (STps->eof == ST_FM_HIT) {
2212 STps->eof = ST_FM;
2213 STps->drv_block = 0;
2214 if (STps->drv_file >= 0)
2215 STps->drv_file++;
2216 } else if (STps->eof == ST_EOD_1) {
2217 STps->eof = ST_EOD_2;
2218 STps->drv_block = 0;
2219 if (STps->drv_file >= 0)
2220 STps->drv_file++;
2221 } else if (STps->eof == ST_EOD_2)
2222 STps->eof = ST_EOD;
2223 } else if (STps->eof == ST_FM)
2224 STps->eof = ST_NOEOF;
2225 retval = total;
2226
2227 out:
2228 if (SRpnt != NULL) {
8b05b773 2229 st_release_request(SRpnt);
1da177e4
LT		 2230 SRpnt = NULL;
2231 }
2232 if (do_dio) {
787926b1 2233 release_buffering(STp, 1);
1da177e4
LT		 2234 STbp->buffer_bytes = 0;
2235 }
28f85009 2236 mutex_unlock(&STp->lock);
1da177e4
LT		 2237
2238 return retval;
2239}
2240\f
2241
2242
2243DEB(
2244/* Set the driver options */
b30d8bca 2245static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
1da177e4
LT		 2246{
2247 if (debugging) {
b30d8bca
HR		 2248 st_printk(KERN_INFO, STp,
2249 "Mode %d options: buffer writes: %d, "
2250 "async writes: %d, read ahead: %d\n",
2251 STp->current_mode, STm->do_buffer_writes,
2252 STm->do_async_writes, STm->do_read_ahead);
2253 st_printk(KERN_INFO, STp,
2254 " can bsr: %d, two FMs: %d, "
2255 "fast mteom: %d, auto lock: %d,\n",
2256 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2257 STp->do_auto_lock);
2258 st_printk(KERN_INFO, STp,
2259 " defs for wr: %d, no block limits: %d, "
2260 "partitions: %d, s2 log: %d\n",
2261 STm->defaults_for_writes, STp->omit_blklims,
2262 STp->can_partitions, STp->scsi2_logical);
2263 st_printk(KERN_INFO, STp,
2264 " sysv: %d nowait: %d sili: %d "
2265 "nowait_filemark: %d\n",
2266 STm->sysv, STp->immediate, STp->sili,
2267 STp->immediate_filemark);
2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
1da177e4
LT		 2269 }
2270}
2271 )
2272
2273
2274static int st_set_options(struct scsi_tape *STp, long options)
2275{
2276 int value;
2277 long code;
2278 struct st_modedef *STm;
1da177e4 2279 struct cdev *cd0, *cd1;
d6216c47 2280 struct device *d0, *d1;
1da177e4
LT		 2281
2282 STm = &(STp->modes[STp->current_mode]);
2283 if (!STm->defined) {
d6216c47
ML		 2284 cd0 = STm->cdevs[0];
2285 cd1 = STm->cdevs[1];
2286 d0 = STm->devs[0];
2287 d1 = STm->devs[1];
1da177e4 2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
d6216c47
ML		 2289 STm->cdevs[0] = cd0;
2290 STm->cdevs[1] = cd1;
2291 STm->devs[0] = d0;
2292 STm->devs[1] = d1;
1da177e4 2293 modes_defined = 1;
b30d8bca
HR		 2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2295 STp->current_mode);
1da177e4
LT		 2296 }
2297
2298 code = options & MT_ST_OPTIONS;
2299 if (code == MT_ST_BOOLEANS) {
2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2309 if ((STp->device)->scsi_level >= SCSI_2)
2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2312 STp->immediate = (options & MT_ST_NOWAIT) != 0;
c743e44f 2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
1da177e4 2314 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2315 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4 2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
b30d8bca 2317 st_log_options(STp, STm); )
1da177e4
LT		 2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2319 value = (code == MT_ST_SETBOOLEANS);
2320 if ((options & MT_ST_BUFFER_WRITES) != 0)
2321 STm->do_buffer_writes = value;
2322 if ((options & MT_ST_ASYNC_WRITES) != 0)
2323 STm->do_async_writes = value;
2324 if ((options & MT_ST_DEF_WRITES) != 0)
2325 STm->defaults_for_writes = value;
2326 if ((options & MT_ST_READ_AHEAD) != 0)
2327 STm->do_read_ahead = value;
2328 if ((options & MT_ST_TWO_FM) != 0)
2329 STp->two_fm = value;
2330 if ((options & MT_ST_FAST_MTEOM) != 0)
2331 STp->fast_mteom = value;
2332 if ((options & MT_ST_AUTO_LOCK) != 0)
2333 STp->do_auto_lock = value;
2334 if ((options & MT_ST_CAN_BSR) != 0)
2335 STp->can_bsr = value;
2336 if ((options & MT_ST_NO_BLKLIMS) != 0)
2337 STp->omit_blklims = value;
2338 if ((STp->device)->scsi_level >= SCSI_2 &&
2339 (options & MT_ST_CAN_PARTITIONS) != 0)
2340 STp->can_partitions = value;
2341 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2342 STp->scsi2_logical = value;
2343 if ((options & MT_ST_NOWAIT) != 0)
2344 STp->immediate = value;
c743e44f
LD		 2345 if ((options & MT_ST_NOWAIT_EOF) != 0)
2346 STp->immediate_filemark = value;
1da177e4
LT		 2347 if ((options & MT_ST_SYSV) != 0)
2348 STm->sysv = value;
40f6b36c
KM		 2349 if ((options & MT_ST_SILI) != 0)
2350 STp->sili = value;
b30d8bca 2351 DEB(
1da177e4
LT		 2352 if ((options & MT_ST_DEBUGGING) != 0)
2353 debugging = value;
b30d8bca 2354 st_log_options(STp, STm); )
1da177e4
LT		 2355 } else if (code == MT_ST_WRITE_THRESHOLD) {
2356 /* Retained for compatibility */
2357 } else if (code == MT_ST_DEF_BLKSIZE) {
2358 value = (options & ~MT_ST_OPTIONS);
2359 if (value == ~MT_ST_OPTIONS) {
2360 STm->default_blksize = (-1);
b30d8bca 2361 DEBC_printk(STp, "Default block size disabled.\n");
1da177e4
LT		 2362 } else {
2363 STm->default_blksize = value;
b30d8bca
HR		 2364 DEBC_printk(STp,"Default block size set to "
2365 "%d bytes.\n", STm->default_blksize);
1da177e4
LT		 2366 if (STp->ready == ST_READY) {
2367 STp->blksize_changed = 0;
2368 set_mode_densblk(STp, STm);
2369 }
2370 }
2371 } else if (code == MT_ST_TIMEOUTS) {
2372 value = (options & ~MT_ST_OPTIONS);
2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
b30d8bca
HR		 2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2376 (value & ~MT_ST_SET_LONG_TIMEOUT));
1da177e4 2377 } else {
a02488ed
JB		 2378 blk_queue_rq_timeout(STp->device->request_queue,
2379 value * HZ);
b30d8bca
HR		 2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2381 value);
1da177e4
LT		 2382 }
2383 } else if (code == MT_ST_SET_CLN) {
2384 value = (options & ~MT_ST_OPTIONS) & 0xff;
2385 if (value != 0 &&
832151f4
RK		 2386 (value < EXTENDED_SENSE_START ||
2387 value >= SCSI_SENSE_BUFFERSIZE))
1da177e4
LT		 2388 return (-EINVAL);
2389 STp->cln_mode = value;
2390 STp->cln_sense_mask = (options >> 8) & 0xff;
2391 STp->cln_sense_value = (options >> 16) & 0xff;
b30d8bca
HR		 2392 st_printk(KERN_INFO, STp,
2393 "Cleaning request mode %d, mask %02x, value %02x\n",
2394 value, STp->cln_sense_mask, STp->cln_sense_value);
1da177e4
LT		 2395 } else if (code == MT_ST_DEF_OPTIONS) {
2396 code = (options & ~MT_ST_CLEAR_DEFAULT);
2397 value = (options & MT_ST_CLEAR_DEFAULT);
2398 if (code == MT_ST_DEF_DENSITY) {
2399 if (value == MT_ST_CLEAR_DEFAULT) {
2400 STm->default_density = (-1);
b30d8bca
HR		 2401 DEBC_printk(STp,
2402 "Density default disabled.\n");
1da177e4
LT		 2403 } else {
2404 STm->default_density = value & 0xff;
b30d8bca
HR		 2405 DEBC_printk(STp, "Density default set to %x\n",
2406 STm->default_density);
1da177e4
LT		 2407 if (STp->ready == ST_READY) {
2408 STp->density_changed = 0;
2409 set_mode_densblk(STp, STm);
2410 }
2411 }
2412 } else if (code == MT_ST_DEF_DRVBUFFER) {
2413 if (value == MT_ST_CLEAR_DEFAULT) {
2414 STp->default_drvbuffer = 0xff;
b30d8bca
HR		 2415 DEBC_printk(STp,
2416 "Drive buffer default disabled.\n");
1da177e4
LT		 2417 } else {
2418 STp->default_drvbuffer = value & 7;
b30d8bca
HR		 2419 DEBC_printk(STp,
2420 "Drive buffer default set to %x\n",
2421 STp->default_drvbuffer);
1da177e4
LT		 2422 if (STp->ready == ST_READY)
2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2424 }
2425 } else if (code == MT_ST_DEF_COMPRESSION) {
2426 if (value == MT_ST_CLEAR_DEFAULT) {
2427 STm->default_compression = ST_DONT_TOUCH;
b30d8bca
HR		 2428 DEBC_printk(STp,
2429 "Compression default disabled.\n");
1da177e4
LT		 2430 } else {
2431 if ((value & 0xff00) != 0) {
2432 STp->c_algo = (value & 0xff00) >> 8;
b30d8bca
HR		 2433 DEBC_printk(STp, "Compression "
2434 "algorithm set to 0x%x.\n",
2435 STp->c_algo);
1da177e4
LT		 2436 }
2437 if ((value & 0xff) != 0xff) {
2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
b30d8bca
HR		 2439 DEBC_printk(STp, "Compression default "
2440 "set to %x\n",
2441 (value & 1));
1da177e4
LT		 2442 if (STp->ready == ST_READY) {
2443 STp->compression_changed = 0;
2444 st_compression(STp, (STm->default_compression == ST_YES));
2445 }
2446 }
2447 }
2448 }
2449 } else
2450 return (-EIO);
2451
2452 return 0;
2453}
2454\f
2455#define MODE_HEADER_LENGTH 4
2456
2457/* Mode header and page byte offsets */
2458#define MH_OFF_DATA_LENGTH 0
2459#define MH_OFF_MEDIUM_TYPE 1
2460#define MH_OFF_DEV_SPECIFIC 2
2461#define MH_OFF_BDESCS_LENGTH 3
2462#define MP_OFF_PAGE_NBR 0
2463#define MP_OFF_PAGE_LENGTH 1
2464
2465/* Mode header and page bit masks */
2466#define MH_BIT_WP 0x80
2467#define MP_MSK_PAGE_NBR 0x3f
2468
2469/* Don't return block descriptors */
2470#define MODE_SENSE_OMIT_BDESCS 0x08
2471
2472#define MODE_SELECT_PAGE_FORMAT 0x10
2473
2474/* Read a mode page into the tape buffer. The block descriptors are included
2475 if incl_block_descs is true. The page control is ored to the page number
2476 parameter, if necessary. */
2477static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2478{
2479 unsigned char cmd[MAX_COMMAND_SIZE];
8ecf0d99 2480 struct st_request *SRpnt;
1da177e4
LT		 2481
2482 memset(cmd, 0, MAX_COMMAND_SIZE);
2483 cmd[0] = MODE_SENSE;
2484 if (omit_block_descs)
2485 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2486 cmd[2] = page;
2487 cmd[4] = 255;
2488
02ae2c0e
KM		 2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2490 STp->device->request_queue->rq_timeout, 0, 1);
2491 if (SRpnt == NULL)
2492 return (STp->buffer)->syscall_result;
1da177e4 2493
8b05b773 2494 st_release_request(SRpnt);
1da177e4 2495
02ae2c0e 2496 return STp->buffer->syscall_result;
1da177e4
LT		 2497}
2498
2499
2500/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2502static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2503{
02ae2c0e 2504 int pgo;
1da177e4 2505 unsigned char cmd[MAX_COMMAND_SIZE];
18c87015 2506 struct st_request *SRpnt;
02ae2c0e 2507 int timeout;
1da177e4
LT		 2508
2509 memset(cmd, 0, MAX_COMMAND_SIZE);
2510 cmd[0] = MODE_SELECT;
2511 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2514
2515 /* Clear reserved fields */
2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2520
02ae2c0e
KM		 2521 timeout = slow ?
2522 STp->long_timeout : STp->device->request_queue->rq_timeout;
2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2524 timeout, 0, 1);
2525 if (SRpnt == NULL)
2526 return (STp->buffer)->syscall_result;
1da177e4 2527
8b05b773 2528 st_release_request(SRpnt);
1da177e4 2529
02ae2c0e 2530 return STp->buffer->syscall_result;
1da177e4
LT		 2531}
2532
2533
2534#define COMPRESSION_PAGE 0x0f
2535#define COMPRESSION_PAGE_LENGTH 16
2536
2537#define CP_OFF_DCE_DCC 2
2538#define CP_OFF_C_ALGO 7
2539
2540#define DCE_MASK 0x80
2541#define DCC_MASK 0x40
2542#define RED_MASK 0x60
2543
2544
2545/* Control the compression with mode page 15. Algorithm not changed if zero.
2546
2547 The block descriptors are read and written because Sony SDT-7000 does not
2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2549 Including block descriptors should not cause any harm to other drives. */
2550
2551static int st_compression(struct scsi_tape * STp, int state)
2552{
2553 int retval;
2554 int mpoffs; /* Offset to mode page start */
2555 unsigned char *b_data = (STp->buffer)->b_data;
1da177e4
LT		 2556
2557 if (STp->ready != ST_READY)
2558 return (-EIO);
2559
2560 /* Read the current page contents */
2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2562 if (retval) {
b30d8bca 2563 DEBC_printk(STp, "Compression mode page not supported.\n");
1da177e4
LT		 2564 return (-EIO);
2565 }
2566
2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 2568 DEBC_printk(STp, "Compression state is %d.\n",
2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
1da177e4
LT		 2570
2571 /* Check if compression can be changed */
2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
b30d8bca 2573 DEBC_printk(STp, "Compression not supported.\n");
1da177e4
LT		 2574 return (-EIO);
2575 }
2576
2577 /* Do the change */
2578 if (state) {
2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2580 if (STp->c_algo != 0)
2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2582 }
2583 else {
2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2585 if (STp->c_algo != 0)
2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2587 }
2588
2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2590 if (retval) {
b30d8bca 2591 DEBC_printk(STp, "Compression change failed.\n");
1da177e4
LT		 2592 return (-EIO);
2593 }
b30d8bca 2594 DEBC_printk(STp, "Compression state changed to %d.\n", state);
1da177e4
LT		 2595
2596 STp->compression_changed = 1;
2597 return 0;
2598}
2599
2600
2601/* Process the load and unload commands (does unload if the load code is zero) */
2602static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2603{
2604 int retval = (-EIO), timeout;
1da177e4
LT		 2605 unsigned char cmd[MAX_COMMAND_SIZE];
2606 struct st_partstat *STps;
8b05b773 2607 struct st_request *SRpnt;
1da177e4
LT		 2608
2609 if (STp->ready != ST_READY && !load_code) {
2610 if (STp->ready == ST_NO_TAPE)
2611 return (-ENOMEDIUM);
2612 else
2613 return (-EIO);
2614 }
2615
2616 memset(cmd, 0, MAX_COMMAND_SIZE);
2617 cmd[0] = START_STOP;
2618 if (load_code)
2619 cmd[4] |= 1;
2620 /*
2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2622 */
2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
b30d8bca
HR		 2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2626 (cmd[4]) ? "" : "un",
2627 load_code - MT_ST_HPLOADER_OFFSET);
1da177e4
LT		 2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2629 }
2630 if (STp->immediate) {
2631 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2632 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2633 }
2634 else
2635 timeout = STp->long_timeout;
2636
2637 DEBC(
2638 if (!load_code)
b30d8bca 2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
1da177e4 2640 else
b30d8bca 2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
1da177e4
LT		 2642 );
2643
02ae2c0e
KM		 2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2645 timeout, MAX_RETRIES, 1);
1da177e4 2646 if (!SRpnt)
02ae2c0e 2647 return (STp->buffer)->syscall_result;
1da177e4
LT		 2648
2649 retval = (STp->buffer)->syscall_result;
02ae2c0e 2650 st_release_request(SRpnt);
1da177e4
LT		 2651
2652 if (!retval) { /* SCSI command successful */
2653
2654 if (!load_code) {
2655 STp->rew_at_close = 0;
2656 STp->ready = ST_NO_TAPE;
2657 }
2658 else {
2659 STp->rew_at_close = STp->autorew_dev;
2660 retval = check_tape(STp, filp);
2661 if (retval > 0)
2662 retval = 0;
2663 }
2664 }
2665 else {
2666 STps = &(STp->ps[STp->partition]);
2667 STps->drv_file = STps->drv_block = (-1);
2668 }
2669
2670 return retval;
2671}
2672\f
2673#if DEBUG
2674#define ST_DEB_FORWARD 0
2675#define ST_DEB_BACKWARD 1
b30d8bca 2676static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
1da177e4
LT		 2677{
2678 s32 sc;
2679
b30d8bca
HR		 2680 if (!debugging)
2681 return;
2682
35b703db 2683 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
1da177e4
LT		 2684 if (direction)
2685 sc = -sc;
b30d8bca
HR		 2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2687 direction ? "backward" : "forward", sc, units);
1da177e4 2688}
b30d8bca
HR		 2689#else
2690#define ST_DEB_FORWARD 0
2691#define ST_DEB_BACKWARD 1
2692static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2693#endif
2694
2695
2696/* Internal ioctl function */
2697static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2698{
2699 int timeout;
2700 long ltmp;
2701 int ioctl_result;
2702 int chg_eof = 1;
2703 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2704 struct st_request *SRpnt;
1da177e4
LT		 2705 struct st_partstat *STps;
2706 int fileno, blkno, at_sm, undone;
2707 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2708
2709 WARN_ON(STp->buffer->do_dio != 0);
2710 if (STp->ready != ST_READY) {
2711 if (STp->ready == ST_NO_TAPE)
2712 return (-ENOMEDIUM);
2713 else
2714 return (-EIO);
2715 }
2716 timeout = STp->long_timeout;
2717 STps = &(STp->ps[STp->partition]);
2718 fileno = STps->drv_file;
2719 blkno = STps->drv_block;
2720 at_sm = STps->at_sm;
2721
2722 memset(cmd, 0, MAX_COMMAND_SIZE);
2723 switch (cmd_in) {
2724 case MTFSFM:
2725 chg_eof = 0; /* Changed from the FSF after this */
211d62a8 2726 /* fall through */
1da177e4
LT		 2727 case MTFSF:
2728 cmd[0] = SPACE;
2729 cmd[1] = 0x01; /* Space FileMarks */
2730 cmd[2] = (arg >> 16);
2731 cmd[3] = (arg >> 8);
2732 cmd[4] = arg;
b30d8bca 2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2734 if (fileno >= 0)
2735 fileno += arg;
2736 blkno = 0;
2737 at_sm &= (arg == 0);
2738 break;
2739 case MTBSFM:
2740 chg_eof = 0; /* Changed from the FSF after this */
211d62a8 2741 /* fall through */
1da177e4
LT		 2742 case MTBSF:
2743 cmd[0] = SPACE;
2744 cmd[1] = 0x01; /* Space FileMarks */
2745 ltmp = (-arg);
2746 cmd[2] = (ltmp >> 16);
2747 cmd[3] = (ltmp >> 8);
2748 cmd[4] = ltmp;
b30d8bca 2749 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2750 if (fileno >= 0)
2751 fileno -= arg;
2752 blkno = (-1); /* We can't know the block number */
2753 at_sm &= (arg == 0);
2754 break;
2755 case MTFSR:
2756 cmd[0] = SPACE;
2757 cmd[1] = 0x00; /* Space Blocks */
2758 cmd[2] = (arg >> 16);
2759 cmd[3] = (arg >> 8);
2760 cmd[4] = arg;
b30d8bca 2761 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2762 if (blkno >= 0)
2763 blkno += arg;
2764 at_sm &= (arg == 0);
2765 break;
2766 case MTBSR:
2767 cmd[0] = SPACE;
2768 cmd[1] = 0x00; /* Space Blocks */
2769 ltmp = (-arg);
2770 cmd[2] = (ltmp >> 16);
2771 cmd[3] = (ltmp >> 8);
2772 cmd[4] = ltmp;
b30d8bca 2773 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2774 if (blkno >= 0)
2775 blkno -= arg;
2776 at_sm &= (arg == 0);
2777 break;
2778 case MTFSS:
2779 cmd[0] = SPACE;
2780 cmd[1] = 0x04; /* Space Setmarks */
2781 cmd[2] = (arg >> 16);
2782 cmd[3] = (arg >> 8);
2783 cmd[4] = arg;
b30d8bca 2784 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2785 if (arg != 0) {
2786 blkno = fileno = (-1);
2787 at_sm = 1;
2788 }
2789 break;
2790 case MTBSS:
2791 cmd[0] = SPACE;
2792 cmd[1] = 0x04; /* Space Setmarks */
2793 ltmp = (-arg);
2794 cmd[2] = (ltmp >> 16);
2795 cmd[3] = (ltmp >> 8);
2796 cmd[4] = ltmp;
b30d8bca 2797 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2798 if (arg != 0) {
2799 blkno = fileno = (-1);
2800 at_sm = 1;
2801 }
2802 break;
2803 case MTWEOF:
3e51d3c9 2804 case MTWEOFI:
1da177e4
LT		 2805 case MTWSM:
2806 if (STp->write_prot)
2807 return (-EACCES);
2808 cmd[0] = WRITE_FILEMARKS;
2809 if (cmd_in == MTWSM)
2810 cmd[1] = 2;
c743e44f
LD		 2811 if (cmd_in == MTWEOFI ||
2812 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2813 cmd[1] |= 1;
1da177e4
LT		 2814 cmd[2] = (arg >> 16);
2815 cmd[3] = (arg >> 8);
2816 cmd[4] = arg;
a02488ed 2817 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2818 DEBC(
2819 if (cmd_in != MTWSM)
2820 st_printk(ST_DEB_MSG, STp,
2821 "Writing %d filemarks.\n",
2822 cmd[2] * 65536 +
2823 cmd[3] * 256 +
2824 cmd[4]);
2825 else
2826 st_printk(ST_DEB_MSG, STp,
2827 "Writing %d setmarks.\n",
2828 cmd[2] * 65536 +
2829 cmd[3] * 256 +
2830 cmd[4]);
1da177e4
LT		 2831 )
2832 if (fileno >= 0)
2833 fileno += arg;
2834 blkno = 0;
2835 at_sm = (cmd_in == MTWSM);
2836 break;
2837 case MTREW:
2838 cmd[0] = REZERO_UNIT;
2839 if (STp->immediate) {
2840 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2841 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2842 }
b30d8bca 2843 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2844 fileno = blkno = at_sm = 0;
2845 break;
2846 case MTNOP:
b30d8bca 2847 DEBC_printk(STp, "No op on tape.\n");
1da177e4
LT		 2848 return 0; /* Should do something ? */
2849 break;
2850 case MTRETEN:
2851 cmd[0] = START_STOP;
2852 if (STp->immediate) {
2853 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2854 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2855 }
2856 cmd[4] = 3;
b30d8bca 2857 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2858 fileno = blkno = at_sm = 0;
2859 break;
2860 case MTEOM:
2861 if (!STp->fast_mteom) {
2862 /* space to the end of tape */
2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2864 fileno = STps->drv_file;
2865 if (STps->eof >= ST_EOD_1)
2866 return 0;
2867 /* The next lines would hide the number of spaced FileMarks
2868 That's why I inserted the previous lines. I had no luck
2869 with detecting EOM with FSF, so we go now to EOM.
2870 Joerg Weule */
2871 } else
2872 fileno = (-1);
2873 cmd[0] = SPACE;
2874 cmd[1] = 3;
b30d8bca 2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2876 blkno = -1;
2877 at_sm = 0;
2878 break;
2879 case MTERASE:
2880 if (STp->write_prot)
2881 return (-EACCES);
2882 cmd[0] = ERASE;
2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2884 if (STp->immediate) {
2885 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2886 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2887 }
2888 else
2889 timeout = STp->long_timeout * 8;
2890
b30d8bca 2891 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2892 fileno = blkno = at_sm = 0;
2893 break;
2894 case MTSETBLK: /* Set block length */
2895 case MTSETDENSITY: /* Set tape density */
2896 case MTSETDRVBUFFER: /* Set drive buffering */
2897 case SET_DENS_AND_BLK: /* Set density and block size */
2898 chg_eof = 0;
2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2900 return (-EIO); /* Not allowed if data in buffer */
2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2902 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2903 STp->max_block > 0 &&
2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2907 return (-EINVAL);
2908 }
2909 cmd[0] = MODE_SELECT;
2910 if ((STp->use_pf & USE_PF))
2911 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2912 cmd[4] = datalen = 12;
2913 direction = DMA_TO_DEVICE;
2914
2915 memset((STp->buffer)->b_data, 0, 12);
2916 if (cmd_in == MTSETDRVBUFFER)
2917 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2918 else
2919 (STp->buffer)->b_data[2] =
2920 STp->drv_buffer << 4;
2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2922 if (cmd_in == MTSETDENSITY) {
2923 (STp->buffer)->b_data[4] = arg;
2924 STp->density_changed = 1; /* At least we tried ;-) */
2925 } else if (cmd_in == SET_DENS_AND_BLK)
2926 (STp->buffer)->b_data[4] = arg >> 24;
2927 else
2928 (STp->buffer)->b_data[4] = STp->density;
2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2930 ltmp = arg & MT_ST_BLKSIZE_MASK;
2931 if (cmd_in == MTSETBLK)
2932 STp->blksize_changed = 1; /* At least we tried ;-) */
2933 } else
2934 ltmp = STp->block_size;
2935 (STp->buffer)->b_data[9] = (ltmp >> 16);
2936 (STp->buffer)->b_data[10] = (ltmp >> 8);
2937 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2938 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2939 DEBC(
1da177e4 2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2941 st_printk(ST_DEB_MSG, STp,
2942 "Setting block size to %d bytes.\n",
2943 (STp->buffer)->b_data[9] * 65536 +
2944 (STp->buffer)->b_data[10] * 256 +
2945 (STp->buffer)->b_data[11]);
1da177e4 2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2947 st_printk(ST_DEB_MSG, STp,
2948 "Setting density code to %x.\n",
2949 (STp->buffer)->b_data[4]);
1da177e4 2950 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2951 st_printk(ST_DEB_MSG, STp,
2952 "Setting drive buffer code to %d.\n",
2953 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2954 )
2955 break;
2956 default:
2957 return (-ENOSYS);
2958 }
2959
02ae2c0e
KM		 2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2961 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2962 if (!SRpnt)
2963 return (STp->buffer)->syscall_result;
2964
02ae2c0e 2965 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2966
2967 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2968 st_release_request(SRpnt);
1da177e4
LT		 2969 SRpnt = NULL;
2970 STps->drv_block = blkno;
2971 STps->drv_file = fileno;
2972 STps->at_sm = at_sm;
2973
2974 if (cmd_in == MTBSFM)
2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2976 else if (cmd_in == MTFSFM)
2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2978
2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2981 if (STp->block_size != 0) {
1da177e4
LT		 2982 (STp->buffer)->buffer_blocks =
2983 (STp->buffer)->buffer_size / STp->block_size;
2984 }
2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2986 if (cmd_in == SET_DENS_AND_BLK)
2987 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2988 } else if (cmd_in == MTSETDRVBUFFER)
2989 STp->drv_buffer = (arg & 7);
2990 else if (cmd_in == MTSETDENSITY)
2991 STp->density = arg;
2992
2993 if (cmd_in == MTEOM)
2994 STps->eof = ST_EOD;
2995 else if (cmd_in == MTFSF)
2996 STps->eof = ST_FM;
2997 else if (chg_eof)
2998 STps->eof = ST_NOEOF;
2999
3e51d3c9
KM		 3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 3002 } else { /* SCSI command was not completely successful. Don't return
3003 from this block without releasing the SCSI command block! */
3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3005
3006 if (cmdstatp->flags & SENSE_EOM) {
3007 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3008 cmd_in != MTBSR && cmd_in != MTBSS)
3009 STps->eof = ST_EOM_OK;
3010 STps->drv_block = 0;
3011 }
3012
3013 if (cmdstatp->remainder_valid)
3014 undone = (int)cmdstatp->uremainder64;
3015 else
3016 undone = 0;
3017
3e51d3c9 3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3019 cmdstatp->have_sense &&
91614c05
KM		 3020 (cmdstatp->flags & SENSE_EOM)) {
3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3024 STps->eof = ST_NOEOF;
3025 } else { /* Writing EOF(s) failed */
3026 if (fileno >= 0)
3027 fileno -= undone;
3028 if (undone < arg)
3029 STps->eof = ST_NOEOF;
3030 }
1da177e4 3031 STps->drv_file = fileno;
1da177e4
LT		 3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3033 if (fileno >= 0)
3034 STps->drv_file = fileno - undone;
3035 else
3036 STps->drv_file = fileno;
3037 STps->drv_block = -1;
3038 STps->eof = ST_NOEOF;
3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3041 undone = (-undone);
3042 if (STps->drv_file >= 0)
3043 STps->drv_file = fileno + undone;
3044 STps->drv_block = 0;
3045 STps->eof = ST_NOEOF;
3046 } else if (cmd_in == MTFSR) {
3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3048 if (STps->drv_file >= 0)
3049 STps->drv_file++;
3050 STps->drv_block = 0;
3051 STps->eof = ST_FM;
3052 } else {
3053 if (blkno >= undone)
3054 STps->drv_block = blkno - undone;
3055 else
3056 STps->drv_block = (-1);
3057 STps->eof = ST_NOEOF;
3058 }
3059 } else if (cmd_in == MTBSR) {
3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3061 STps->drv_file--;
3062 STps->drv_block = (-1);
3063 } else {
3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3065 undone = (-undone);
3066 if (STps->drv_block >= 0)
3067 STps->drv_block = blkno + undone;
3068 }
3069 STps->eof = ST_NOEOF;
3070 } else if (cmd_in == MTEOM) {
3071 STps->drv_file = (-1);
3072 STps->drv_block = (-1);
3073 STps->eof = ST_EOD;
3074 } else if (cmd_in == MTSETBLK ||
3075 cmd_in == MTSETDENSITY ||
3076 cmd_in == MTSETDRVBUFFER ||
3077 cmd_in == SET_DENS_AND_BLK) {
3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3079 !(STp->use_pf & PF_TESTED)) {
3080 /* Try the other possible state of Page Format if not
3081 already tried */
1da2019f 3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3083 st_release_request(SRpnt);
1da177e4
LT		 3084 SRpnt = NULL;
3085 return st_int_ioctl(STp, cmd_in, arg);
3086 }
3087 } else if (chg_eof)
3088 STps->eof = ST_NOEOF;
3089
3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3091 STps->eof = ST_EOD;
3092
8b05b773 3093 st_release_request(SRpnt);
1da177e4
LT		 3094 SRpnt = NULL;
3095 }
3096
3097 return ioctl_result;
3098}
3099\f
3100
3101/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3102 structure. */
3103
3104static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3105 int logical)
3106{
3107 int result;
3108 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3109 struct st_request *SRpnt;
1da177e4
LT		 3110
3111 if (STp->ready != ST_READY)
3112 return (-EIO);
3113
3114 memset(scmd, 0, MAX_COMMAND_SIZE);
3115 if ((STp->device)->scsi_level < SCSI_2) {
3116 scmd[0] = QFA_REQUEST_BLOCK;
3117 scmd[4] = 3;
3118 } else {
3119 scmd[0] = READ_POSITION;
3120 if (!logical && !STp->scsi2_logical)
3121 scmd[1] = 1;
3122 }
02ae2c0e
KM		 3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3124 STp->device->request_queue->rq_timeout,
3125 MAX_READY_RETRIES, 1);
1da177e4 3126 if (!SRpnt)
02ae2c0e 3127 return (STp->buffer)->syscall_result;
1da177e4
LT		 3128
3129 if ((STp->buffer)->syscall_result != 0 ||
3130 (STp->device->scsi_level >= SCSI_2 &&
3131 ((STp->buffer)->b_data[0] & 4) != 0)) {
3132 *block = *partition = 0;
b30d8bca 3133 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3134 result = (-EIO);
3135 } else {
3136 result = 0;
3137 if ((STp->device)->scsi_level < SCSI_2) {
3138 *block = ((STp->buffer)->b_data[0] << 16)
3139 + ((STp->buffer)->b_data[1] << 8)
3140 + (STp->buffer)->b_data[2];
3141 *partition = 0;
3142 } else {
3143 *block = ((STp->buffer)->b_data[4] << 24)
3144 + ((STp->buffer)->b_data[5] << 16)
3145 + ((STp->buffer)->b_data[6] << 8)
3146 + (STp->buffer)->b_data[7];
3147 *partition = (STp->buffer)->b_data[1];
3148 if (((STp->buffer)->b_data[0] & 0x80) &&
3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3151 }
b30d8bca
HR		 3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3153 *block, *partition);
1da177e4 3154 }
8b05b773 3155 st_release_request(SRpnt);
1da177e4
LT		 3156 SRpnt = NULL;
3157
3158 return result;
3159}
3160
3161
3162/* Set the tape block and partition. Negative partition means that only the
3163 block should be set in vendor specific way. */
3164static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3165 int logical)
3166{
3167 struct st_partstat *STps;
3168 int result, p;
3169 unsigned int blk;
3170 int timeout;
3171 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3172 struct st_request *SRpnt;
1da177e4
LT		 3173
3174 if (STp->ready != ST_READY)
3175 return (-EIO);
3176 timeout = STp->long_timeout;
3177 STps = &(STp->ps[STp->partition]);
3178
b30d8bca
HR		 3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3180 block, partition);
1da177e4
LT		 3181 DEB(if (partition < 0)
3182 return (-EIO); )
3183
3184 /* Update the location at the partition we are leaving */
3185 if ((!STp->can_partitions && partition != 0) ||
3186 partition >= ST_NBR_PARTITIONS)
3187 return (-EINVAL);
3188 if (partition != STp->partition) {
3189 if (get_location(STp, &blk, &p, 1))
3190 STps->last_block_valid = 0;
3191 else {
3192 STps->last_block_valid = 1;
3193 STps->last_block_visited = blk;
b30d8bca
HR		 3194 DEBC_printk(STp, "Visited block %d for "
3195 "partition %d saved.\n",
3196 blk, STp->partition);
1da177e4
LT		 3197 }
3198 }
3199
3200 memset(scmd, 0, MAX_COMMAND_SIZE);
3201 if ((STp->device)->scsi_level < SCSI_2) {
3202 scmd[0] = QFA_SEEK_BLOCK;
3203 scmd[2] = (block >> 16);
3204 scmd[3] = (block >> 8);
3205 scmd[4] = block;
3206 scmd[5] = 0;
3207 } else {
3208 scmd[0] = SEEK_10;
3209 scmd[3] = (block >> 24);
3210 scmd[4] = (block >> 16);
3211 scmd[5] = (block >> 8);
3212 scmd[6] = block;
3213 if (!logical && !STp->scsi2_logical)
3214 scmd[1] = 4;
3215 if (STp->partition != partition) {
3216 scmd[1] |= 2;
3217 scmd[8] = partition;
b30d8bca
HR		 3218 DEBC_printk(STp, "Trying to change partition "
3219 "from %d to %d\n", STp->partition,
3220 partition);
1da177e4
LT		 3221 }
3222 }
3223 if (STp->immediate) {
3224 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3225 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3226 }
3227
02ae2c0e
KM		 3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3229 timeout, MAX_READY_RETRIES, 1);
1da177e4 3230 if (!SRpnt)
02ae2c0e 3231 return (STp->buffer)->syscall_result;
1da177e4
LT		 3232
3233 STps->drv_block = STps->drv_file = (-1);
3234 STps->eof = ST_NOEOF;
3235 if ((STp->buffer)->syscall_result != 0) {
3236 result = (-EIO);
3237 if (STp->can_partitions &&
3238 (STp->device)->scsi_level >= SCSI_2 &&
3239 (p = find_partition(STp)) >= 0)
3240 STp->partition = p;
3241 } else {
3242 if (STp->can_partitions) {
3243 STp->partition = partition;
3244 STps = &(STp->ps[partition]);
3245 if (!STps->last_block_valid ||
3246 STps->last_block_visited != block) {
3247 STps->at_sm = 0;
3248 STps->rw = ST_IDLE;
3249 }
3250 } else
3251 STps->at_sm = 0;
3252 if (block == 0)
3253 STps->drv_block = STps->drv_file = 0;
3254 result = 0;
3255 }
02ae2c0e 3256
8b05b773 3257 st_release_request(SRpnt);
1da177e4
LT		 3258 SRpnt = NULL;
3259
3260 return result;
3261}
3262
3263
3264/* Find the current partition number for the drive status. Called from open and
3265 returns either partition number of negative error code. */
3266static int find_partition(struct scsi_tape *STp)
3267{
3268 int i, partition;
3269 unsigned int block;
3270
3271 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3272 return i;
3273 if (partition >= ST_NBR_PARTITIONS)
3274 return (-EIO);
3275 return partition;
3276}
3277
3278
3279/* Change the partition if necessary */
3280static int switch_partition(struct scsi_tape *STp)
3281{
3282 struct st_partstat *STps;
3283
3284 if (STp->partition == STp->new_partition)
3285 return 0;
3286 STps = &(STp->ps[STp->new_partition]);
3287 if (!STps->last_block_valid)
3288 STps->last_block_visited = 0;
3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3290}
3291\f
3292/* Functions for reading and writing the medium partition mode page. */
3293
3294#define PART_PAGE 0x11
3295#define PART_PAGE_FIXED_LENGTH 8
3296
3297#define PP_OFF_MAX_ADD_PARTS 2
3298#define PP_OFF_NBR_ADD_PARTS 3
3299#define PP_OFF_FLAGS 4
3300#define PP_OFF_PART_UNITS 6
3301#define PP_OFF_RESERVED 7
3302
3303#define PP_BIT_IDP 0x20
8038e645 3304#define PP_BIT_FDP 0x80
1da177e4 3305#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3306#define PP_MSK_PSUM_UNITS 0x18
3307#define PP_MSK_POFM 0x04
1da177e4
LT		 3308
3309/* Get the number of partitions on the tape. As a side effect reads the
3310 mode page into the tape buffer. */
3311static int nbr_partitions(struct scsi_tape *STp)
3312{
3313 int result;
1da177e4
LT		 3314
3315 if (STp->ready != ST_READY)
3316 return (-EIO);
3317
3318 result = read_mode_page(STp, PART_PAGE, 1);
3319
3320 if (result) {
b30d8bca 3321 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3322 result = (-EIO);
3323 } else {
3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3325 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3326 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3327 }
3328
3329 return result;
3330}
3331
3332
8038e645
KM		 3333static int format_medium(struct scsi_tape *STp, int format)
3334{
3335 int result = 0;
3336 int timeout = STp->long_timeout;
3337 unsigned char scmd[MAX_COMMAND_SIZE];
3338 struct st_request *SRpnt;
3339
3340 memset(scmd, 0, MAX_COMMAND_SIZE);
3341 scmd[0] = FORMAT_UNIT;
3342 scmd[2] = format;
3343 if (STp->immediate) {
3344 scmd[1] |= 1; /* Don't wait for completion */
3345 timeout = STp->device->request_queue->rq_timeout;
3346 }
3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3349 timeout, MAX_RETRIES, 1);
3350 if (!SRpnt)
3351 result = STp->buffer->syscall_result;
3352 return result;
3353}
3354
3355
1da177e4
LT		 3356/* Partition the tape into two partitions if size > 0 or one partition if
3357 size == 0.
3358
3359 The block descriptors are read and written because Sony SDT-7000 does not
3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3361
3362 My HP C1533A drive returns only one partition size field. This is used to
3363 set the size of partition 1. There is no size field for the default partition.
3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3366 The following algorithm is used to accommodate both drives: if the number of
3367 partition size fields is greater than the maximum number of additional partitions
3368 in the mode page, the second field is used. Otherwise the first field is used.
3369
3370 For Seagate DDS drives the page length must be 8 when no partitions is defined
3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3372 is acceptable also to some other old drives and enforced if the first partition
3373 size field is used for the first additional partition size.
8038e645
KM		 3374
3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3376 */
3377static int partition_tape(struct scsi_tape *STp, int size)
3378{
1da177e4 3379 int result;
8038e645
KM		 3380 int target_partition;
3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3382 int pgo, psd_cnt, psdo;
8038e645 3383 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3384 unsigned char *bp;
3385
3386 result = read_mode_page(STp, PART_PAGE, 0);
3387 if (result) {
b30d8bca 3388 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3389 return result;
3390 }
8038e645
KM		 3391 target_partition = 1;
3392 if (size < 0) {
3393 target_partition = 0;
3394 size = -size;
3395 }
3396
1da177e4
LT		 3397 /* The mode page is in the buffer. Let's modify it and write it. */
3398 bp = (STp->buffer)->b_data;
3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3400 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3402
3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3404
3405 if (scsi3) {
3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3407 if (needs_format && size == 0) {
3408 /* No need to write the mode page when clearing
3409 * partitioning
3410 */
3411 DEBC_printk(STp, "Formatting tape with one partition.\n");
3412 result = format_medium(STp, 0);
3413 goto out;
3414 }
3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3416 psd_cnt = 2;
3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3418 /* Use units scaling for large partitions if the device
3419 * suggests it and no precision lost. Required for IBM
3420 * TS1140/50 drives that don't support MB units.
3421 */
3422 if (size >= 1000 && (size % 1000) == 0) {
3423 size /= 1000;
3424 psum = PP_MSK_PSUM_UNITS;
3425 units = 9; /* GB */
3426 }
3427 }
3428 /* Try it anyway if too large to specify in MB */
3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3430 size /= 1000;
3431 psum = PP_MSK_PSUM_UNITS;
3432 units = 9; /* GB */
3433 }
3434 }
3435
3436 if (size >= 65535 || /* Does not fit into two bytes */
3437 (target_partition == 0 && psd_cnt < 2)) {
3438 result = -EINVAL;
3439 goto out;
3440 }
3441
1da177e4 3442 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3443 /* The second condition is for HP DDS which use only one partition size
3444 * descriptor
3445 */
3446 if (target_partition > 0 &&
3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3450 psdo += 2;
3451 }
3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3453
b30d8bca 3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3457
8038e645 3458 if (size == 0) {
1da177e4
LT		 3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3462 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3463 } else {
3464 bp[psdo] = (size >> 8) & 0xff;
3465 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3466 if (target_partition == 0)
3467 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3468 bp[pgo + 3] = 1;
3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3471 DEBC_printk(STp,
3472 "Formatting tape with two partitions (%i = %d MB).\n",
3473 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3474 }
3475 bp[pgo + PP_OFF_PART_UNITS] = 0;
3476 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3477 if (size != 1 || units != 0) {
3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3479 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3480 bp[pgo + PP_OFF_PART_UNITS] = units;
3481 } else
3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3485
3486 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3487
3488 if (!result && needs_format)
3489 result = format_medium(STp, 1);
3490
1da177e4 3491 if (result) {
b30d8bca 3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3493 result = (-EIO);
3494 }
3495
8038e645 3496out:
1da177e4
LT		 3497 return result;
3498}
3499\f
3500
3501
3502/* The ioctl command */
d320a955 3503static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
1da177e4
LT		 3504{
3505 int i, cmd_nr, cmd_type, bt;
3506 int retval = 0;
3507 unsigned int blk;
3508 struct scsi_tape *STp = file->private_data;
3509 struct st_modedef *STm;
3510 struct st_partstat *STps;
1da177e4 3511
28f85009 3512 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3513 return -ERESTARTSYS;
3514
b30d8bca 3515 DEB(
1da177e4 3516 if (debugging && !STp->in_use) {
b30d8bca 3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3518 retval = (-EIO);
3519 goto out;
3520 } ) /* end DEB */
3521
3522 STm = &(STp->modes[STp->current_mode]);
3523 STps = &(STp->ps[STp->partition]);
3524
3525 /*
3526 * If we are in the middle of error recovery, don't let anyone
3527 * else try and use this device. Also, if error recovery fails, it
3528 * may try and take the device offline, in which case all further
3529 * access to the device is prohibited.
3530 */
906d15fb
CH		 3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3532 file->f_flags & O_NDELAY);
3533 if (retval)
1da177e4 3534 goto out;
1da177e4
LT		 3535
3536 cmd_type = _IOC_TYPE(cmd_in);
3537 cmd_nr = _IOC_NR(cmd_in);
3538
3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3540 struct mtop mtc;
3541
3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3543 retval = (-EINVAL);
3544 goto out;
3545 }
3546
3547 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3548 if (i) {
3549 retval = (-EFAULT);
3550 goto out;
3551 }
3552
3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3554 st_printk(KERN_WARNING, STp,
3555 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3556 retval = (-EPERM);
3557 goto out;
3558 }
3559 if (!STm->defined &&
3560 (mtc.mt_op != MTSETDRVBUFFER &&
3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3562 retval = (-ENXIO);
3563 goto out;
3564 }
3565
3566 if (!STp->pos_unknown) {
3567
3568 if (STps->eof == ST_FM_HIT) {
3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3570 mtc.mt_op == MTEOM) {
3571 mtc.mt_count -= 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3575 mtc.mt_count += 1;
3576 if (STps->drv_file >= 0)
3577 STps->drv_file += 1;
3578 }
3579 }
3580
3581 if (mtc.mt_op == MTSEEK) {
3582 /* Old position must be restored if partition will be
3583 changed */
3584 i = !STp->can_partitions ||
3585 (STp->new_partition != STp->partition);
3586 } else {
3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3592 mtc.mt_op == MTCOMPRESSION;
3593 }
3594 i = flush_buffer(STp, i);
3595 if (i < 0) {
3596 retval = i;
3597 goto out;
3598 }
3599 if (STps->rw == ST_WRITING &&
3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3601 mtc.mt_op == MTSEEK ||
3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3603 i = st_int_ioctl(STp, MTWEOF, 1);
3604 if (i < 0) {
3605 retval = i;
3606 goto out;
3607 }
3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3609 mtc.mt_count++;
3610 STps->rw = ST_IDLE;
3611 }
3612
3613 } else {
3614 /*
3615 * If there was a bus reset, block further access
3616 * to this device. If the user wants to rewind the tape,
3617 * then reset the flag and allow access again.
3618 */
3619 if (mtc.mt_op != MTREW &&
3620 mtc.mt_op != MTOFFL &&
3621 mtc.mt_op != MTRETEN &&
3622 mtc.mt_op != MTERASE &&
3623 mtc.mt_op != MTSEEK &&
3624 mtc.mt_op != MTEOM) {
3625 retval = (-EIO);
3626 goto out;
3627 }
3628 reset_state(STp);
3629 /* remove this when the midlevel properly clears was_reset */
3630 STp->device->was_reset = 0;
3631 }
3632
3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3637
3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3639 do_door_lock(STp, 0); /* Ignore result! */
3640
3641 if (mtc.mt_op == MTSETDRVBUFFER &&
3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3643 retval = st_set_options(STp, mtc.mt_count);
3644 goto out;
3645 }
3646
3647 if (mtc.mt_op == MTSETPART) {
3648 if (!STp->can_partitions ||
3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3650 retval = (-EINVAL);
3651 goto out;
3652 }
3653 if (mtc.mt_count >= STp->nbr_partitions &&
3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3655 retval = (-EIO);
3656 goto out;
3657 }
3658 if (mtc.mt_count >= STp->nbr_partitions) {
3659 retval = (-EINVAL);
3660 goto out;
3661 }
3662 STp->new_partition = mtc.mt_count;
3663 retval = 0;
3664 goto out;
3665 }
3666
3667 if (mtc.mt_op == MTMKPART) {
3668 if (!STp->can_partitions) {
3669 retval = (-EINVAL);
3670 goto out;
3671 }
8038e645
KM		 3672 i = do_load_unload(STp, file, 1);
3673 if (i < 0) {
3674 retval = i;
3675 goto out;
3676 }
3677 i = partition_tape(STp, mtc.mt_count);
3678 if (i < 0) {
1da177e4
LT		 3679 retval = i;
3680 goto out;
3681 }
3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3683 STp->ps[i].rw = ST_IDLE;
3684 STp->ps[i].at_sm = 0;
3685 STp->ps[i].last_block_valid = 0;
3686 }
3687 STp->partition = STp->new_partition = 0;
8038e645 3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3689 STps->drv_block = STps->drv_file = 0;
3690 retval = 0;
3691 goto out;
3692 }
3693
3694 if (mtc.mt_op == MTSEEK) {
3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3696 if (!STp->can_partitions)
3697 STp->ps[0].rw = ST_IDLE;
3698 retval = i;
3699 goto out;
3700 }
3701
3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3703 retval = do_load_unload(STp, file, 0);
3704 goto out;
3705 }
3706
3707 if (mtc.mt_op == MTLOAD) {
3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3709 goto out;
3710 }
3711
3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3714 goto out;
3715 }
3716
3717 if (STp->can_partitions && STp->ready == ST_READY &&
3718 (i = switch_partition(STp)) < 0) {
3719 retval = i;
3720 goto out;
3721 }
3722
3723 if (mtc.mt_op == MTCOMPRESSION)
3724 retval = st_compression(STp, (mtc.mt_count & 1));
3725 else
3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3727 goto out;
3728 }
3729 if (!STm->defined) {
3730 retval = (-ENXIO);
3731 goto out;
3732 }
3733
3734 if ((i = flush_buffer(STp, 0)) < 0) {
3735 retval = i;
3736 goto out;
3737 }
3738 if (STp->can_partitions &&
3739 (i = switch_partition(STp)) < 0) {
3740 retval = i;
3741 goto out;
3742 }
3743
3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3745 struct mtget mt_status;
3746
3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3748 retval = (-EINVAL);
3749 goto out;
3750 }
3751
3752 mt_status.mt_type = STp->tape_type;
3753 mt_status.mt_dsreg =
3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3756 mt_status.mt_blkno = STps->drv_block;
3757 mt_status.mt_fileno = STps->drv_file;
3758 if (STp->block_size != 0) {
3759 if (STps->rw == ST_WRITING)
3760 mt_status.mt_blkno +=
3761 (STp->buffer)->buffer_bytes / STp->block_size;
3762 else if (STps->rw == ST_READING)
3763 mt_status.mt_blkno -=
3764 ((STp->buffer)->buffer_bytes +
3765 STp->block_size - 1) / STp->block_size;
3766 }
3767
3768 mt_status.mt_gstat = 0;
3769 if (STp->drv_write_prot)
3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3771 if (mt_status.mt_blkno == 0) {
3772 if (mt_status.mt_fileno == 0)
3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3774 else
3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3776 }
3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3778 mt_status.mt_resid = STp->partition;
3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3781 else if (STps->eof >= ST_EOM_OK)
3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3783 if (STp->density == 1)
3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3785 else if (STp->density == 2)
3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3787 else if (STp->density == 3)
3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3789 if (STp->ready == ST_READY)
3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3791 if (STp->ready == ST_NO_TAPE)
3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3793 if (STps->at_sm)
3794 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3795 if (STm->do_async_writes ||
3796 (STm->do_buffer_writes && STp->block_size != 0) ||
3797 STp->drv_buffer != 0)
3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3799 if (STp->cleaning_req)
3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3801
1207045d
AB		 3802 retval = put_user_mtget(p, &mt_status);
3803 if (retval)
1da177e4 3804 goto out;
1da177e4
LT		 3805
3806 STp->recover_reg = 0; /* Clear after read */
1da177e4
LT		 3807 goto out;
3808 } /* End of MTIOCGET */
3809 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3810 struct mtpos mt_pos;
3811 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3812 retval = (-EINVAL);
3813 goto out;
3814 }
3815 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3816 retval = i;
3817 goto out;
3818 }
3819 mt_pos.mt_blkno = blk;
1207045d 3820 retval = put_user_mtpos(p, &mt_pos);
1da177e4
LT		 3821 goto out;
3822 }
28f85009 3823 mutex_unlock(&STp->lock);
1da177e4 3824 switch (cmd_in) {
d320a955
AB		 3825 case SCSI_IOCTL_STOP_UNIT:
3826 /* unload */
3827 retval = scsi_ioctl(STp->device, cmd_in, p);
3828 if (!retval) {
3829 STp->rew_at_close = 0;
3830 STp->ready = ST_NO_TAPE;
3831 }
3832 return retval;
3833
1da177e4
LT		 3834 case SCSI_IOCTL_GET_IDLUN:
3835 case SCSI_IOCTL_GET_BUS_NUMBER:
3836 break;
d320a955 3837
1da177e4 3838 default:
16c4b3e2
KM		 3839 if ((cmd_in == SG_IO ||
3840 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3841 cmd_in == CDROM_SEND_PACKET) &&
3842 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3843 i = -EPERM;
3844 else
74f3c8af
AV		 3845 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3846 file->f_mode, cmd_in, p);
1da177e4
LT		 3847 if (i != -ENOTTY)
3848 return i;
3849 break;
3850 }
d320a955 3851 return -ENOTTY;
1da177e4
LT		 3852
3853 out:
28f85009 3854 mutex_unlock(&STp->lock);
1da177e4
LT		 3855 return retval;
3856}
3857
d320a955
AB		 3858static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3859{
3860 void __user *p = (void __user *)arg;
3861 struct scsi_tape *STp = file->private_data;
3862 int ret;
3863
3864 ret = st_ioctl_common(file, cmd_in, p);
3865 if (ret != -ENOTTY)
3866 return ret;
3867
3868 return scsi_ioctl(STp->device, cmd_in, p);
3869}
3870
1da177e4 3871#ifdef CONFIG_COMPAT
1207045d 3872static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4 3873{
1207045d 3874 void __user *p = compat_ptr(arg);
1da177e4 3875 struct scsi_tape *STp = file->private_data;
d320a955 3876 int ret;
1207045d
AB		 3877
3878 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3879 switch (cmd_in) {
1207045d 3880 case MTIOCPOS32:
d320a955 3881 return st_ioctl_common(file, MTIOCPOS, p);
1207045d 3882 case MTIOCGET32:
d320a955 3883 return st_ioctl_common(file, MTIOCGET, p);
1207045d
AB		 3884 }
3885
d320a955
AB		 3886 ret = st_ioctl_common(file, cmd_in, p);
3887 if (ret != -ENOTTY)
3888 return ret;
1da177e4 3889
d320a955 3890 return scsi_compat_ioctl(STp->device, cmd_in, p);
1da177e4
LT		 3891}
3892#endif
3893
3894\f
3895
3896/* Try to allocate a new tape buffer. Calling function must not hold
3897 dev_arr_lock. */
f409d6cc 3898static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
1da177e4 3899{
1da177e4
LT		 3900 struct st_buffer *tb;
3901
4011f076 3902 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
1da177e4
LT		 3903 if (!tb) {
3904 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3905 return NULL;
3906 }
1ac63cf5 3907 tb->frp_segs = 0;
1da177e4 3908 tb->use_sg = max_sg;
1da177e4 3909 tb->dma = need_dma;
f409d6cc 3910 tb->buffer_size = 0;
1da177e4 3911
6396bb22 3912 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
4011f076 3913 GFP_KERNEL);
d0e1ae31
FT		 3914 if (!tb->reserved_pages) {
3915 kfree(tb);
3916 return NULL;
3917 }
3918
1da177e4
LT		 3919 return tb;
3920}
3921
3922
3923/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3924#define ST_MAX_ORDER 6
3925
1da177e4
LT		 3926static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3927{
769989a4 3928 int segs, max_segs, b_size, order, got;
c53033f6 3929 gfp_t priority;
1da177e4
LT		 3930
3931 if (new_size <= STbuffer->buffer_size)
3932 return 1;
3933
3934 if (STbuffer->buffer_size <= PAGE_SIZE)
3935 normalize_buffer(STbuffer); /* Avoid extra segment */
3936
3937 max_segs = STbuffer->use_sg;
1da177e4
LT		 3938
3939 priority = GFP_KERNEL | __GFP_NOWARN;
3940 if (need_dma)
3941 priority |= GFP_DMA;
9c905966 3942
08c95832
FT		 3943 if (STbuffer->cleared)
3944 priority |= __GFP_ZERO;
3945
9c905966 3946 if (STbuffer->frp_segs) {
c982c368 3947 order = STbuffer->reserved_page_order;
08c95832 3948 b_size = PAGE_SIZE << order;
9c905966
FT		 3949 } else {
3950 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3951 order < ST_MAX_ORDER &&
3952 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3953 order++, b_size *= 2)
9c905966 3954 ; /* empty */
373daacf 3955 STbuffer->reserved_page_order = order;
9c905966 3956 }
8f78fc5e
KM		 3957 if (max_segs * (PAGE_SIZE << order) < new_size) {
3958 if (order == ST_MAX_ORDER)
3959 return 0;
3960 normalize_buffer(STbuffer);
3961 return enlarge_buffer(STbuffer, new_size, need_dma);
3962 }
1da177e4
LT		 3963
3964 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3965 segs < max_segs && got < new_size;) {
08c95832
FT		 3966 struct page *page;
3967
3968 page = alloc_pages(priority, order);
3969 if (!page) {
1da177e4
LT		 3970 DEB(STbuffer->buffer_size = got);
3971 normalize_buffer(STbuffer);
3972 return 0;
3973 }
08c95832 3974
1da177e4
LT		 3975 STbuffer->frp_segs += 1;
3976 got += b_size;
3977 STbuffer->buffer_size = got;
08c95832 3978 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3979 segs++;
3980 }
08c95832 3981 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3982
3983 return 1;
3984}
3985
3986
40f6b36c
KM		 3987/* Make sure that no data from previous user is in the internal buffer */
3988static void clear_buffer(struct st_buffer * st_bp)
3989{
3990 int i;
3991
3992 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3993 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3994 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3995 st_bp->cleared = 1;
3996}
3997
3998
1da177e4
LT		 3999/* Release the extra buffer */
4000static void normalize_buffer(struct st_buffer * STbuffer)
4001{
c982c368 4002 int i, order = STbuffer->reserved_page_order;
1da177e4 4003
1ac63cf5 4004 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 4005 __free_pages(STbuffer->reserved_pages[i], order);
4006 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 4007 }
1ac63cf5 4008 STbuffer->frp_segs = 0;
8b05b773 4009 STbuffer->sg_segs = 0;
c982c368 4010 STbuffer->reserved_page_order = 0;
d0e1ae31 4011 STbuffer->map_data.offset = 0;
1da177e4
LT		 4012}
4013
4014
4015/* Move data from the user buffer to the tape buffer. Returns zero (success) or
4016 negative error code. */
4017static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, 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->buffer_bytes;
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: append_to_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_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4033 if (res)
4034 return (-EFAULT);
4035 do_count -= cnt;
4036 st_bp->buffer_bytes += cnt;
4037 ubp += cnt;
4038 offset = 0;
4039 }
4040 if (do_count) /* Should never happen */
4041 return (-EIO);
4042
4043 return 0;
4044}
4045
4046
4047/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4048 negative error code. */
4049static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4050{
4051 int i, cnt, res, offset;
c982c368 4052 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4053
4054 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4055 i < st_bp->frp_segs && offset >= length; i++)
4056 offset -= length;
1da177e4
LT		 4057 if (i == st_bp->frp_segs) { /* Should never happen */
4058 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4059 return (-EIO);
4060 }
4061 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4062 struct page *page = st_bp->reserved_pages[i];
4063 cnt = length - offset < do_count ? length - offset : do_count;
4064 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4065 if (res)
4066 return (-EFAULT);
4067 do_count -= cnt;
4068 st_bp->buffer_bytes -= cnt;
4069 st_bp->read_pointer += cnt;
4070 ubp += cnt;
4071 offset = 0;
4072 }
4073 if (do_count) /* Should never happen */
4074 return (-EIO);
4075
4076 return 0;
4077}
4078
4079
4080/* Move data towards start of buffer */
4081static void move_buffer_data(struct st_buffer * st_bp, int offset)
4082{
4083 int src_seg, dst_seg, src_offset = 0, dst_offset;
4084 int count, total;
c982c368 4085 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4086
4087 if (offset == 0)
4088 return;
4089
4090 total=st_bp->buffer_bytes - offset;
4091 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4092 src_offset = offset;
08c95832 4093 if (src_offset < length)
1da177e4 4094 break;
08c95832 4095 offset -= length;
1da177e4
LT		 4096 }
4097
4098 st_bp->buffer_bytes = st_bp->read_pointer = total;
4099 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4100 struct page *dpage = st_bp->reserved_pages[dst_seg];
4101 struct page *spage = st_bp->reserved_pages[src_seg];
4102
4103 count = min(length - dst_offset, length - src_offset);
4104 memmove(page_address(dpage) + dst_offset,
4105 page_address(spage) + src_offset, count);
1da177e4 4106 src_offset += count;
08c95832 4107 if (src_offset >= length) {
1da177e4
LT		 4108 src_seg++;
4109 src_offset = 0;
4110 }
4111 dst_offset += count;
08c95832 4112 if (dst_offset >= length) {
1da177e4
LT		 4113 dst_seg++;
4114 dst_offset = 0;
4115 }
4116 total -= count;
4117 }
4118}
4119
1da177e4
LT		 4120/* Validate the options from command line or module parameters */
4121static void validate_options(void)
4122{
4123 if (buffer_kbs > 0)
4124 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4125 if (max_sg_segs >= ST_FIRST_SG)
4126 st_max_sg_segs = max_sg_segs;
4127}
4128
4129#ifndef MODULE
4130/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4131 */
4132static int __init st_setup(char *str)
4133{
4134 int i, len, ints[5];
4135 char *stp;
4136
4137 stp = get_options(str, ARRAY_SIZE(ints), ints);
4138
4139 if (ints[0] > 0) {
4140 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4141 if (parms[i].val)
4142 *parms[i].val = ints[i + 1];
4143 } else {
4144 while (stp != NULL) {
4145 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4146 len = strlen(parms[i].name);
4147 if (!strncmp(stp, parms[i].name, len) &&
4148 (*(stp + len) == ':' || *(stp + len) == '=')) {
4149 if (parms[i].val)
4150 *parms[i].val =
4151 simple_strtoul(stp + len + 1, NULL, 0);
4152 else
4153 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4154 parms[i].name);
4155 break;
4156 }
4157 }
6391a113 4158 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4159 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4160 stp);
4161 stp = strchr(stp, ',');
4162 if (stp)
4163 stp++;
4164 }
4165 }
4166
4167 validate_options();
4168
4169 return 1;
4170}
4171
4172__setup("st=", st_setup);
4173
4174#endif
4175
00977a59 4176static const struct file_operations st_fops =
1da177e4
LT		 4177{
4178 .owner = THIS_MODULE,
4179 .read = st_read,
4180 .write = st_write,
fd66c1b4 4181 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4182#ifdef CONFIG_COMPAT
4183 .compat_ioctl = st_compat_ioctl,
4184#endif
4185 .open = st_open,
4186 .flush = st_flush,
4187 .release = st_release,
b4d878e2 4188 .llseek = noop_llseek,
1da177e4
LT		 4189};
4190
26898afd
JM		 4191static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4192{
4193 int i, error;
4194 dev_t cdev_devno;
4195 struct cdev *cdev;
4196 struct device *dev;
4197 struct st_modedef *STm = &(tape->modes[mode]);
4198 char name[10];
4199 int dev_num = tape->index;
4200
4201 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4202
4203 cdev = cdev_alloc();
4204 if (!cdev) {
4205 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4206 error = -ENOMEM;
4207 goto out;
4208 }
4209 cdev->owner = THIS_MODULE;
4210 cdev->ops = &st_fops;
ab08ee14 4211 STm->cdevs[rew] = cdev;
26898afd
JM		 4212
4213 error = cdev_add(cdev, cdev_devno, 1);
4214 if (error) {
4215 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4216 rew ? "non" : "auto", mode);
4217 pr_err("st%d: Device not attached.\n", dev_num);
4218 goto out_free;
4219 }
26898afd
JM		 4220
4221 i = mode << (4 - ST_NBR_MODE_BITS);
4222 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4223 tape->disk->disk_name, st_formats[i]);
4224
4225 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4226 cdev_devno, &tape->modes[mode], "%s", name);
4227 if (IS_ERR(dev)) {
4228 pr_err("st%d: device_create failed\n", dev_num);
4229 error = PTR_ERR(dev);
4230 goto out_free;
4231 }
4232
4233 STm->devs[rew] = dev;
4234
4235 return 0;
4236out_free:
4237 cdev_del(STm->cdevs[rew]);
26898afd 4238out:
ab08ee14
ML		 4239 STm->cdevs[rew] = NULL;
4240 STm->devs[rew] = NULL;
26898afd
JM		 4241 return error;
4242}
4243
4244static int create_cdevs(struct scsi_tape *tape)
4245{
4246 int mode, error;
4247 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4248 error = create_one_cdev(tape, mode, 0);
4249 if (error)
4250 return error;
4251 error = create_one_cdev(tape, mode, 1);
4252 if (error)
4253 return error;
4254 }
4255
4256 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4257 &tape->modes[0].devs[0]->kobj, "tape");
4258}
4259
4260static void remove_cdevs(struct scsi_tape *tape)
4261{
4262 int mode, rew;
4263 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4264 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4265 struct st_modedef *STm = &(tape->modes[mode]);
4266 for (rew = 0; rew < 2; rew++) {
4267 if (STm->cdevs[rew])
4268 cdev_del(STm->cdevs[rew]);
4269 if (STm->devs[rew])
4270 device_unregister(STm->devs[rew]);
4271 }
4272 }
4273}
4274
1da177e4
LT		 4275static int st_probe(struct device *dev)
4276{
4277 struct scsi_device *SDp = to_scsi_device(dev);
4278 struct gendisk *disk = NULL;
1da177e4
LT		 4279 struct scsi_tape *tpnt = NULL;
4280 struct st_modedef *STm;
4281 struct st_partstat *STps;
4282 struct st_buffer *buffer;
b98c52b5 4283 int i, error;
1da177e4 4284 char *stp;
1da177e4
LT		 4285
4286 if (SDp->type != TYPE_TAPE)
4287 return -ENODEV;
4288 if ((stp = st_incompatible(SDp))) {
b30d8bca 4289 sdev_printk(KERN_INFO, SDp,
4e3ea141
HR		 4290 "OnStream tapes are no longer supported;\n");
4291 sdev_printk(KERN_INFO, SDp,
4292 "please mail to linux-scsi@vger.kernel.org.\n");
1da177e4
LT		 4293 return -ENODEV;
4294 }
4295
6fe8c1db 4296 scsi_autopm_get_device(SDp);
8a78362c 4297 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4298 if (st_max_sg_segs < i)
4299 i = st_max_sg_segs;
f409d6cc 4300 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
1da177e4 4301 if (buffer == NULL) {
b30d8bca
HR		 4302 sdev_printk(KERN_ERR, SDp,
4303 "st: Can't allocate new tape buffer. "
4304 "Device not attached.\n");
1da177e4
LT		 4305 goto out;
4306 }
4307
4308 disk = alloc_disk(1);
4309 if (!disk) {
b30d8bca
HR		 4310 sdev_printk(KERN_ERR, SDp,
4311 "st: out of memory. Device not attached.\n");
1da177e4
LT		 4312 goto out_buffer_free;
4313 }
4314
1f618aac 4315 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
1da177e4 4316 if (tpnt == NULL) {
b30d8bca
HR		 4317 sdev_printk(KERN_ERR, SDp,
4318 "st: Can't allocate device descriptor.\n");
1da177e4
LT		 4319 goto out_put_disk;
4320 }
f03a5670 4321 kref_init(&tpnt->kref);
1da177e4 4322 tpnt->disk = disk;
1da177e4 4323 disk->private_data = &tpnt->driver;
2b5bebcc
JL		 4324 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4325 * take queue reference that release_disk() expects. */
180efde0 4326 if (!blk_get_queue(SDp->request_queue))
2b5bebcc 4327 goto out_put_disk;
180efde0 4328 disk->queue = SDp->request_queue;
1da177e4 4329 tpnt->driver = &st_template;
1da177e4
LT		 4330
4331 tpnt->device = SDp;
4332 if (SDp->scsi_level <= 2)
4333 tpnt->tape_type = MT_ISSCSI1;
4334 else
4335 tpnt->tape_type = MT_ISSCSI2;
4336
4337 tpnt->buffer = buffer;
f03a5670 4338 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4339
4340 tpnt->inited = 0;
4341 tpnt->dirty = 0;
4342 tpnt->in_use = 0;
4343 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4344 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4345 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4346 tpnt->density = 0;
4347 tpnt->do_auto_lock = ST_AUTO_LOCK;
4348 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4349 tpnt->can_partitions = 0;
4350 tpnt->two_fm = ST_TWO_FM;
4351 tpnt->fast_mteom = ST_FAST_MTEOM;
4352 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4353 tpnt->sili = ST_SILI;
1da177e4 4354 tpnt->immediate = ST_NOWAIT;
c743e44f 4355 tpnt->immediate_filemark = 0;
1da177e4
LT		 4356 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4357 tpnt->partition = 0;
4358 tpnt->new_partition = 0;
4359 tpnt->nbr_partitions = 0;
a02488ed 4360 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4361 tpnt->long_timeout = ST_LONG_TIMEOUT;
4362 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4363
1da177e4
LT		 4364 for (i = 0; i < ST_NBR_MODES; i++) {
4365 STm = &(tpnt->modes[i]);
4366 STm->defined = 0;
4367 STm->sysv = ST_SYSV;
4368 STm->defaults_for_writes = 0;
4369 STm->do_async_writes = ST_ASYNC_WRITES;
4370 STm->do_buffer_writes = ST_BUFFER_WRITES;
4371 STm->do_read_ahead = ST_READ_AHEAD;
4372 STm->default_compression = ST_DONT_TOUCH;
4373 STm->default_blksize = (-1); /* No forced size */
4374 STm->default_density = (-1); /* No forced density */
6c648d95 4375 STm->tape = tpnt;
1da177e4
LT		 4376 }
4377
4378 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4379 STps = &(tpnt->ps[i]);
4380 STps->rw = ST_IDLE;
4381 STps->eof = ST_NOEOF;
4382 STps->at_sm = 0;
4383 STps->last_block_valid = 0;
4384 STps->drv_block = (-1);
4385 STps->drv_file = (-1);
4386 }
4387
4388 tpnt->current_mode = 0;
4389 tpnt->modes[0].defined = 1;
4390
4391 tpnt->density_changed = tpnt->compression_changed =
4392 tpnt->blksize_changed = 0;
28f85009 4393 mutex_init(&tpnt->lock);
1da177e4 4394
b98c52b5 4395 idr_preload(GFP_KERNEL);
6c648d95 4396 spin_lock(&st_index_lock);
b98c52b5 4397 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4398 spin_unlock(&st_index_lock);
b98c52b5
TH		 4399 idr_preload_end();
4400 if (error < 0) {
6c648d95 4401 pr_warn("st: idr allocation failed: %d\n", error);
2b5bebcc 4402 goto out_put_queue;
6c648d95 4403 }
b98c52b5
TH		 4404 tpnt->index = error;
4405 sprintf(disk->disk_name, "st%d", tpnt->index);
05545c92
SS		 4406 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4407 if (tpnt->stats == NULL) {
4408 sdev_printk(KERN_ERR, SDp,
4409 "st: Can't allocate statistics.\n");
4410 goto out_idr_remove;
4411 }
6c648d95
JM		 4412
4413 dev_set_drvdata(dev, tpnt);
1da177e4 4414
1da177e4 4415
26898afd
JM		 4416 error = create_cdevs(tpnt);
4417 if (error)
4418 goto out_remove_devs;
46a243f7 4419 scsi_autopm_put_device(SDp);
1da177e4 4420
42252854 4421 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4422 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4423 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4424 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4425 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4426
4427 return 0;
4428
26898afd
JM		 4429out_remove_devs:
4430 remove_cdevs(tpnt);
05545c92
SS		 4431 kfree(tpnt->stats);
4432out_idr_remove:
6c648d95 4433 spin_lock(&st_index_lock);
b98c52b5 4434 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4435 spin_unlock(&st_index_lock);
2b5bebcc
JL		 4436out_put_queue:
4437 blk_put_queue(disk->queue);
1da177e4
LT		 4438out_put_disk:
4439 put_disk(disk);
c9475cb0 4440 kfree(tpnt);
1da177e4
LT		 4441out_buffer_free:
4442 kfree(buffer);
4443out:
6fe8c1db 4444 scsi_autopm_put_device(SDp);
1da177e4
LT		 4445 return -ENODEV;
4446};
4447
4448
4449static int st_remove(struct device *dev)
4450{
6c648d95 4451 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4452 int index = tpnt->index;
4453
4454 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4455 remove_cdevs(tpnt);
1da177e4 4456
6c648d95
JM		 4457 mutex_lock(&st_ref_mutex);
4458 kref_put(&tpnt->kref, scsi_tape_release);
4459 mutex_unlock(&st_ref_mutex);
4460 spin_lock(&st_index_lock);
4461 idr_remove(&st_index_idr, index);
4462 spin_unlock(&st_index_lock);
1da177e4
LT		 4463 return 0;
4464}
4465
f03a5670
KM		 4466/**
4467 * scsi_tape_release - Called to free the Scsi_Tape structure
4468 * @kref: pointer to embedded kref
4469 *
0b950672 4470 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4471 * called on last put, you should always use the scsi_tape_get()
4472 * scsi_tape_put() helpers which manipulate the semaphore directly
4473 * and never do a direct kref_put().
4474 **/
4475static void scsi_tape_release(struct kref *kref)
4476{
4477 struct scsi_tape *tpnt = to_scsi_tape(kref);
4478 struct gendisk *disk = tpnt->disk;
4479
4480 tpnt->device = NULL;
4481
4482 if (tpnt->buffer) {
f03a5670 4483 normalize_buffer(tpnt->buffer);
d0e1ae31 4484 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4485 kfree(tpnt->buffer);
4486 }
4487
4488 disk->private_data = NULL;
4489 put_disk(disk);
05545c92 4490 kfree(tpnt->stats);
f03a5670
KM		 4491 kfree(tpnt);
4492 return;
4493}
4494
af23782b
JM		 4495static struct class st_sysfs_class = {
4496 .name = "scsi_tape",
c69c6be5 4497 .dev_groups = st_dev_groups,
af23782b
JM		 4498};
4499
1da177e4
LT		 4500static int __init init_st(void)
4501{
13026a6b
JG		 4502 int err;
4503
1da177e4
LT		 4504 validate_options();
4505
13026a6b 4506 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4507 verstr, st_fixed_buffer_size, st_max_sg_segs);
4508
2bec708a
LO		 4509 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4510 if (debugging) {
4511 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4512 debugging);
4513 }
4514
af23782b
JM		 4515 err = class_register(&st_sysfs_class);
4516 if (err) {
4517 pr_err("Unable register sysfs class for SCSI tapes\n");
4518 return err;
1da177e4
LT		 4519 }
4520
13026a6b
JG		 4521 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4522 ST_MAX_TAPE_ENTRIES, "st");
4523 if (err) {
4524 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4525 SCSI_TAPE_MAJOR);
4526 goto err_class;
1da177e4
LT		 4527 }
4528
13026a6b
JG		 4529 err = scsi_register_driver(&st_template.gendrv);
4530 if (err)
4531 goto err_chrdev;
4532
13026a6b
JG		 4533 return 0;
4534
13026a6b
JG		 4535err_chrdev:
4536 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4537 ST_MAX_TAPE_ENTRIES);
4538err_class:
af23782b 4539 class_unregister(&st_sysfs_class);
13026a6b 4540 return err;
1da177e4
LT		 4541}
4542
4543static void __exit exit_st(void)
4544{
1da177e4
LT		 4545 scsi_unregister_driver(&st_template.gendrv);
4546 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4547 ST_MAX_TAPE_ENTRIES);
af23782b 4548 class_unregister(&st_sysfs_class);
2d3a5d21 4549 idr_destroy(&st_index_idr);
1da177e4
LT		 4550 printk(KERN_INFO "st: Unloaded.\n");
4551}
4552
4553module_init(init_st);
4554module_exit(exit_st);
4555
4556
4557/* The sysfs driver interface. Read-only at the moment */
10978e48 4558static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4559{
10978e48 4560 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4561}
10978e48 4562static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4563
10978e48 4564static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4565{
10978e48 4566 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4567}
10978e48 4568static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4569
10978e48 4570static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4571{
10978e48 4572 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4573}
10978e48 4574static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4575
10978e48 4576static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4577{
10978e48 4578 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4579}
10978e48 4580static DRIVER_ATTR_RO(version);
1da177e4 4581
d9b43a10
SS		 4582#if DEBUG
4583static ssize_t debug_flag_store(struct device_driver *ddp,
4584 const char *buf, size_t count)
4585{
4586/* We only care what the first byte of the data is the rest is unused.
4587 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4588 * other values have -EINVAL returned if they are passed in.
4589 */
4590 if (count > 0) {
4591 if (buf[0] == '0') {
4592 debugging = NO_DEBUG;
4593 return count;
4594 } else if (buf[0] == '1') {
4595 debugging = 1;
4596 return count;
4597 }
4598 }
4599 return -EINVAL;
4600}
4601
4602static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4603{
4604 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4605}
4606static DRIVER_ATTR_RW(debug_flag);
4607#endif
4608
442d7562
SS		 4609static struct attribute *st_drv_attrs[] = {
4610 &driver_attr_try_direct_io.attr,
4611 &driver_attr_fixed_buffer_size.attr,
4612 &driver_attr_max_sg_segs.attr,
4613 &driver_attr_version.attr,
d9b43a10
SS		 4614#if DEBUG
4615 &driver_attr_debug_flag.attr,
4616#endif
442d7562
SS		 4617 NULL,
4618};
4619ATTRIBUTE_GROUPS(st_drv);
1da177e4 4620
1da177e4 4621/* The sysfs simple class interface */
ee959b00 4622static ssize_t
af23782b 4623defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4624{
7d15d6a4 4625 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4626 ssize_t l = 0;
4627
4628 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4629 return l;
4630}
c69c6be5 4631static DEVICE_ATTR_RO(defined);
1da177e4 4632
ee959b00 4633static ssize_t
af23782b
JM		 4634default_blksize_show(struct device *dev, struct device_attribute *attr,
4635 char *buf)
1da177e4 4636{
7d15d6a4 4637 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4638 ssize_t l = 0;
4639
4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4641 return l;
4642}
c69c6be5 4643static DEVICE_ATTR_RO(default_blksize);
1da177e4 4644
ee959b00 4645static ssize_t
af23782b
JM		 4646default_density_show(struct device *dev, struct device_attribute *attr,
4647 char *buf)
1da177e4 4648{
7d15d6a4 4649 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4650 ssize_t l = 0;
4651 char *fmt;
4652
4653 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4654 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4655 return l;
4656}
c69c6be5 4657static DEVICE_ATTR_RO(default_density);
1da177e4 4658
ee959b00 4659static ssize_t
af23782b
JM		 4660default_compression_show(struct device *dev, struct device_attribute *attr,
4661 char *buf)
1da177e4 4662{
7d15d6a4 4663 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4664 ssize_t l = 0;
4665
4666 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4667 return l;
4668}
c69c6be5 4669static DEVICE_ATTR_RO(default_compression);
1da177e4 4670
ee959b00 4671static ssize_t
af23782b 4672options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4673{
7d15d6a4 4674 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4675 struct scsi_tape *STp = STm->tape;
4676 int options;
b174be02
KM		 4677 ssize_t l = 0;
4678
b174be02
KM		 4679 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4680 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4681 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4682 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4683 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4684 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4685 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4686 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4687 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4688 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4689 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4690 options |= STm->sysv ? MT_ST_SYSV : 0;
4691 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4692 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4693 options |= STp->sili ? MT_ST_SILI : 0;
4694
4695 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4696 return l;
4697}
c69c6be5
GKH		 4698static DEVICE_ATTR_RO(options);
4699
05545c92
SS		 4700/* Support for tape stats */
4701
4702/**
4703 * read_cnt_show - return read count - count of reads made from tape drive
4704 * @dev: struct device
4705 * @attr: attribute structure
4706 * @buf: buffer to return formatted data in
4707 */
4708static ssize_t read_cnt_show(struct device *dev,
4709 struct device_attribute *attr, char *buf)
4710{
4711 struct st_modedef *STm = dev_get_drvdata(dev);
4712
4713 return sprintf(buf, "%lld",
4714 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4715}
4716static DEVICE_ATTR_RO(read_cnt);
4717
4718/**
4719 * read_byte_cnt_show - return read byte count - tape drives
4720 * may use blocks less than 512 bytes this gives the raw byte count of
4721 * of data read from the tape drive.
4722 * @dev: struct device
4723 * @attr: attribute structure
4724 * @buf: buffer to return formatted data in
4725 */
4726static ssize_t read_byte_cnt_show(struct device *dev,
4727 struct device_attribute *attr, char *buf)
4728{
4729 struct st_modedef *STm = dev_get_drvdata(dev);
4730
4731 return sprintf(buf, "%lld",
4732 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4733}
4734static DEVICE_ATTR_RO(read_byte_cnt);
4735
4736/**
e2dca2a2 4737 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
05545c92
SS		 4738 * @dev: struct device
4739 * @attr: attribute structure
4740 * @buf: buffer to return formatted data in
4741 */
4742static ssize_t read_ns_show(struct device *dev,
4743 struct device_attribute *attr, char *buf)
4744{
4745 struct st_modedef *STm = dev_get_drvdata(dev);
4746
4747 return sprintf(buf, "%lld",
4748 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4749}
4750static DEVICE_ATTR_RO(read_ns);
4751
4752/**
4753 * write_cnt_show - write count - number of user calls
4754 * to write(2) that have written data to tape.
4755 * @dev: struct device
4756 * @attr: attribute structure
4757 * @buf: buffer to return formatted data in
4758 */
4759static ssize_t write_cnt_show(struct device *dev,
4760 struct device_attribute *attr, char *buf)
4761{
4762 struct st_modedef *STm = dev_get_drvdata(dev);
4763
4764 return sprintf(buf, "%lld",
4765 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4766}
4767static DEVICE_ATTR_RO(write_cnt);
4768
4769/**
4770 * write_byte_cnt_show - write byte count - raw count of
4771 * bytes written to tape.
4772 * @dev: struct device
4773 * @attr: attribute structure
4774 * @buf: buffer to return formatted data in
4775 */
4776static ssize_t write_byte_cnt_show(struct device *dev,
4777 struct device_attribute *attr, char *buf)
4778{
4779 struct st_modedef *STm = dev_get_drvdata(dev);
4780
4781 return sprintf(buf, "%lld",
4782 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4783}
4784static DEVICE_ATTR_RO(write_byte_cnt);
4785
4786/**
4787 * write_ns_show - write ns - number of nanoseconds waiting on write
4788 * requests to complete.
4789 * @dev: struct device
4790 * @attr: attribute structure
4791 * @buf: buffer to return formatted data in
4792 */
4793static ssize_t write_ns_show(struct device *dev,
4794 struct device_attribute *attr, char *buf)
4795{
4796 struct st_modedef *STm = dev_get_drvdata(dev);
4797
4798 return sprintf(buf, "%lld",
4799 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4800}
4801static DEVICE_ATTR_RO(write_ns);
4802
4803/**
4804 * in_flight_show - number of I/Os currently in flight -
4805 * in most cases this will be either 0 or 1. It may be higher if someone
4806 * has also issued other SCSI commands such as via an ioctl.
4807 * @dev: struct device
4808 * @attr: attribute structure
4809 * @buf: buffer to return formatted data in
4810 */
4811static ssize_t in_flight_show(struct device *dev,
4812 struct device_attribute *attr, char *buf)
4813{
4814 struct st_modedef *STm = dev_get_drvdata(dev);
4815
4816 return sprintf(buf, "%lld",
4817 (long long)atomic64_read(&STm->tape->stats->in_flight));
4818}
4819static DEVICE_ATTR_RO(in_flight);
4820
4821/**
4822 * io_ns_show - io wait ns - this is the number of ns spent
4823 * waiting on all I/O to complete. This includes tape movement commands
4824 * such as rewinding, seeking to end of file or tape, it also includes
4825 * read and write. To determine the time spent on tape movement
4826 * subtract the read and write ns from this value.
4827 * @dev: struct device
4828 * @attr: attribute structure
4829 * @buf: buffer to return formatted data in
4830 */
4831static ssize_t io_ns_show(struct device *dev,
4832 struct device_attribute *attr, char *buf)
4833{
4834 struct st_modedef *STm = dev_get_drvdata(dev);
4835
4836 return sprintf(buf, "%lld",
4837 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4838}
4839static DEVICE_ATTR_RO(io_ns);
4840
4841/**
4842 * other_cnt_show - other io count - this is the number of
4843 * I/O requests other than read and write requests.
4844 * Typically these are tape movement requests but will include driver
4845 * tape movement. This includes only requests issued by the st driver.
4846 * @dev: struct device
4847 * @attr: attribute structure
4848 * @buf: buffer to return formatted data in
4849 */
4850static ssize_t other_cnt_show(struct device *dev,
4851 struct device_attribute *attr, char *buf)
4852{
4853 struct st_modedef *STm = dev_get_drvdata(dev);
4854
4855 return sprintf(buf, "%lld",
4856 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4857}
4858static DEVICE_ATTR_RO(other_cnt);
4859
4860/**
4861 * resid_cnt_show - A count of the number of times we get a residual
4862 * count - this should indicate someone issuing reads larger than the
4863 * block size on tape.
4864 * @dev: struct device
4865 * @attr: attribute structure
4866 * @buf: buffer to return formatted data in
4867 */
4868static ssize_t resid_cnt_show(struct device *dev,
4869 struct device_attribute *attr, char *buf)
4870{
4871 struct st_modedef *STm = dev_get_drvdata(dev);
4872
4873 return sprintf(buf, "%lld",
4874 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4875}
4876static DEVICE_ATTR_RO(resid_cnt);
4877
c69c6be5
GKH		 4878static struct attribute *st_dev_attrs[] = {
4879 &dev_attr_defined.attr,
4880 &dev_attr_default_blksize.attr,
4881 &dev_attr_default_density.attr,
4882 &dev_attr_default_compression.attr,
4883 &dev_attr_options.attr,
4884 NULL,
af23782b 4885};
05545c92
SS		 4886
4887static struct attribute *st_stats_attrs[] = {
4888 &dev_attr_read_cnt.attr,
4889 &dev_attr_read_byte_cnt.attr,
4890 &dev_attr_read_ns.attr,
4891 &dev_attr_write_cnt.attr,
4892 &dev_attr_write_byte_cnt.attr,
4893 &dev_attr_write_ns.attr,
4894 &dev_attr_in_flight.attr,
4895 &dev_attr_io_ns.attr,
4896 &dev_attr_other_cnt.attr,
4897 &dev_attr_resid_cnt.attr,
4898 NULL,
4899};
4900
4901static struct attribute_group stats_group = {
4902 .name = "stats",
4903 .attrs = st_stats_attrs,
4904};
4905
4906static struct attribute_group st_group = {
4907 .attrs = st_dev_attrs,
4908};
4909
4910static const struct attribute_group *st_dev_groups[] = {
4911 &st_group,
4912 &stats_group,
4913 NULL,
4914};
b174be02 4915
1da177e4 4916/* The following functions may be useful for a larger audience. */
6620742f
FT		 4917static int sgl_map_user_pages(struct st_buffer *STbp,
4918 const unsigned int max_pages, unsigned long uaddr,
4919 size_t count, int rw)
1da177e4 4920{
07542b83
JB		 4921 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4922 unsigned long start = uaddr >> PAGE_SHIFT;
4923 const int nr_pages = end - start;
1da177e4 4924 int res, i, j;
1da177e4 4925 struct page **pages;
6620742f 4926 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4927
1da177e4
LT		 4928 /* User attempted Overflow! */
4929 if ((uaddr + count) < uaddr)
4930 return -EINVAL;
4931
4932 /* Too big */
4933 if (nr_pages > max_pages)
4934 return -ENOMEM;
4935
4936 /* Hmm? */
4937 if (count == 0)
4938 return 0;
4939
6da2ec56
KC		 4940 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4941 if (pages == NULL)
1da177e4
LT		 4942 return -ENOMEM;
4943
4944 /* Try to fault in all of the necessary pages */
1da177e4 4945 /* rw==READ means read from drive, write into memory area */
73b0140b
IW		 4946 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4947 pages);
1da177e4
LT		 4948
4949 /* Errors and no page mapped should return here */
4950 if (res < nr_pages)
4951 goto out_unmap;
4952
4953 for (i=0; i < nr_pages; i++) {
4954 /* FIXME: flush superflous for rw==READ,
4955 * probably wrong function for rw==WRITE
4956 */
4957 flush_dcache_page(pages[i]);
4958 }
4959
6620742f 4960 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4961 STbp->mapped_pages = pages;
1da177e4 4962
1da177e4 4963 return nr_pages;
1da177e4
LT		 4964 out_unmap:
4965 if (res > 0) {
4966 for (j=0; j < res; j++)
09cbfeaf 4967 put_page(pages[j]);
6bc733e9 4968 res = 0;
1da177e4
LT		 4969 }
4970 kfree(pages);
4971 return res;
4972}
4973
4974
4975/* And unmap them... */
6620742f
FT		 4976static int sgl_unmap_user_pages(struct st_buffer *STbp,
4977 const unsigned int nr_pages, int dirtied)
1da177e4
LT		 4978{
4979 int i;
4980
4981 for (i=0; i < nr_pages; i++) {
6620742f 4982 struct page *page = STbp->mapped_pages[i];
b5810039 4983
b5810039
NP		 4984 if (dirtied)
4985 SetPageDirty(page);
1da177e4
LT		 4986 /* FIXME: cache flush missing for rw==READ
4987 * FIXME: call the correct reference counting function
4988 */
09cbfeaf 4989 put_page(page);
1da177e4 4990 }
6620742f
FT		 4991 kfree(STbp->mapped_pages);
4992 STbp->mapped_pages = NULL;
1da177e4
LT		 4993
4994 return 0;
4995}
Linux 6.x block layer and io_uring tree(s)