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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
4 file Documentation/scsi/st.txt for more information.
5
6 History:
7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
8 Contribution and ideas from several people including (in alphabetical
9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
11 Michael Schaefer, J"org Weule, and Eric Youngdale.
12
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
25#include <linux/fs.h>
26#include <linux/kernel.h>
174cd4b1 27#include <linux/sched/signal.h>
1da177e4
LT		 28#include <linux/mm.h>
29#include <linux/init.h>
30#include <linux/string.h>
5a0e3ad6 31#include <linux/slab.h>
1da177e4
LT		 32#include <linux/errno.h>
33#include <linux/mtio.h>
16c4b3e2 34#include <linux/cdrom.h>
1da177e4
LT		 35#include <linux/ioctl.h>
36#include <linux/fcntl.h>
37#include <linux/spinlock.h>
38#include <linux/blkdev.h>
39#include <linux/moduleparam.h>
1da177e4 40#include <linux/cdev.h>
6c648d95 41#include <linux/idr.h>
1da177e4 42#include <linux/delay.h>
0b950672 43#include <linux/mutex.h>
1da177e4 44
7c0f6ba6 45#include <linux/uaccess.h>
1da177e4 46#include <asm/dma.h>
1da177e4
LT		 47
48#include <scsi/scsi.h>
49#include <scsi/scsi_dbg.h>
50#include <scsi/scsi_device.h>
51#include <scsi/scsi_driver.h>
52#include <scsi/scsi_eh.h>
53#include <scsi/scsi_host.h>
54#include <scsi/scsi_ioctl.h>
16c4b3e2 55#include <scsi/sg.h>
1da177e4
LT		 56
57
58/* The driver prints some debugging information on the console if DEBUG
59 is defined and non-zero. */
2bec708a
LO		 60#define DEBUG 1
61#define NO_DEBUG 0
1da177e4 62
b30d8bca 63#define ST_DEB_MSG KERN_NOTICE
1da177e4
LT		 64#if DEBUG
65/* The message level for the debug messages is currently set to KERN_NOTICE
66 so that people can easily see the messages. Later when the debugging messages
67 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
1da177e4
LT		 68#define DEB(a) a
69#define DEBC(a) if (debugging) { a ; }
70#else
71#define DEB(a)
72#define DEBC(a)
73#endif
74
75#define ST_KILOBYTE 1024
76
77#include "st_options.h"
78#include "st.h"
79
80static int buffer_kbs;
81static int max_sg_segs;
82static int try_direct_io = TRY_DIRECT_IO;
83static int try_rdio = 1;
84static int try_wdio = 1;
2bec708a 85static int debug_flag;
1da177e4 86
af23782b 87static struct class st_sysfs_class;
c69c6be5 88static const struct attribute_group *st_dev_groups[];
442d7562 89static const struct attribute_group *st_drv_groups[];
1da177e4
LT		 90
91MODULE_AUTHOR("Kai Makisara");
f018fa55 92MODULE_DESCRIPTION("SCSI tape (st) driver");
1da177e4 93MODULE_LICENSE("GPL");
f018fa55 94MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
d7b8bcb0 95MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
1da177e4
LT		 96
97/* Set 'perm' (4th argument) to 0 to disable module_param's definition
98 * of sysfs parameters (which module_param doesn't yet support).
99 * Sysfs parameters defined explicitly later.
100 */
101module_param_named(buffer_kbs, buffer_kbs, int, 0);
102MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
103module_param_named(max_sg_segs, max_sg_segs, int, 0);
104MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
105module_param_named(try_direct_io, try_direct_io, int, 0);
106MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
2bec708a
LO		 107module_param_named(debug_flag, debug_flag, int, 0);
108MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
109
1da177e4
LT		 110
111/* Extra parameters for testing */
112module_param_named(try_rdio, try_rdio, int, 0);
113MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
114module_param_named(try_wdio, try_wdio, int, 0);
115MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
116
117#ifndef MODULE
118static int write_threshold_kbs; /* retained for compatibility */
119static struct st_dev_parm {
120 char *name;
121 int *val;
122} parms[] __initdata = {
123 {
124 "buffer_kbs", &buffer_kbs
125 },
126 { /* Retained for compatibility with 2.4 */
127 "write_threshold_kbs", &write_threshold_kbs
128 },
129 {
130 "max_sg_segs", NULL
131 },
132 {
133 "try_direct_io", &try_direct_io
2bec708a
LO		 134 },
135 {
136 "debug_flag", &debug_flag
1da177e4
LT		 137 }
138};
139#endif
140
141/* Restrict the number of modes so that names for all are assigned */
142#if ST_NBR_MODES > 16
143#error "Maximum number of modes is 16"
144#endif
145/* Bit reversed order to get same names for same minors with all
146 mode counts */
0ad78200 147static const char *st_formats[] = {
1da177e4
LT		 148 "", "r", "k", "s", "l", "t", "o", "u",
149 "m", "v", "p", "x", "a", "y", "q", "z"};
150
151/* The default definitions have been moved to st_options.h */
152
153#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
154
155/* The buffer size should fit into the 24 bits for length in the
156 6-byte SCSI read and write commands. */
157#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
158#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
159#endif
160
161static int debugging = DEBUG;
162
163#define MAX_RETRIES 0
164#define MAX_WRITE_RETRIES 0
165#define MAX_READY_RETRIES 0
166#define NO_TAPE NOT_READY
167
168#define ST_TIMEOUT (900 * HZ)
169#define ST_LONG_TIMEOUT (14000 * HZ)
170
171/* Remove mode bits and auto-rewind bit (7) */
172#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
6f46f718 173 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
1da177e4
LT		 174#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
175
176/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
177#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
178 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
179
180/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
181 24 bits) */
182#define SET_DENS_AND_BLK 0x10001
183
1da177e4
LT		 184static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
185static int st_max_sg_segs = ST_MAX_SG;
186
1da177e4
LT		 187static int modes_defined;
188
1da177e4 189static int enlarge_buffer(struct st_buffer *, int, int);
40f6b36c 190static void clear_buffer(struct st_buffer *);
1da177e4
LT		 191static void normalize_buffer(struct st_buffer *);
192static int append_to_buffer(const char __user *, struct st_buffer *, int);
193static int from_buffer(struct st_buffer *, char __user *, int);
194static void move_buffer_data(struct st_buffer *, int);
1da177e4 195
6620742f 196static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
1da177e4 197 unsigned long, size_t, int);
6620742f 198static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
1da177e4
LT		 199
200static int st_probe(struct device *);
201static int st_remove(struct device *);
1da177e4 202
1da177e4 203static struct scsi_driver st_template = {
1da177e4
LT		 204 .gendrv = {
205 .name = "st",
3af6b352 206 .owner = THIS_MODULE,
1da177e4
LT		 207 .probe = st_probe,
208 .remove = st_remove,
442d7562 209 .groups = st_drv_groups,
1da177e4 210 },
1da177e4
LT		 211};
212
213static int st_compression(struct scsi_tape *, int);
214
215static int find_partition(struct scsi_tape *);
216static int switch_partition(struct scsi_tape *);
217
218static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
219
f03a5670
KM		 220static void scsi_tape_release(struct kref *);
221
222#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
223
0b950672 224static DEFINE_MUTEX(st_ref_mutex);
6c648d95
JM		 225static DEFINE_SPINLOCK(st_index_lock);
226static DEFINE_SPINLOCK(st_use_lock);
227static DEFINE_IDR(st_index_idr);
228
f03a5670 229
1da177e4
LT		 230\f
231#include "osst_detect.h"
232#ifndef SIGS_FROM_OSST
233#define SIGS_FROM_OSST \
234 {"OnStream", "SC-", "", "osst"}, \
235 {"OnStream", "DI-", "", "osst"}, \
236 {"OnStream", "DP-", "", "osst"}, \
237 {"OnStream", "USB", "", "osst"}, \
238 {"OnStream", "FW-", "", "osst"}
239#endif
240
f03a5670
KM		 241static struct scsi_tape *scsi_tape_get(int dev)
242{
243 struct scsi_tape *STp = NULL;
244
0b950672 245 mutex_lock(&st_ref_mutex);
6c648d95 246 spin_lock(&st_index_lock);
f03a5670 247
6c648d95 248 STp = idr_find(&st_index_idr, dev);
f03a5670
KM		 249 if (!STp) goto out;
250
251 kref_get(&STp->kref);
252
253 if (!STp->device)
254 goto out_put;
255
256 if (scsi_device_get(STp->device))
257 goto out_put;
258
259 goto out;
260
261out_put:
262 kref_put(&STp->kref, scsi_tape_release);
263 STp = NULL;
264out:
6c648d95 265 spin_unlock(&st_index_lock);
0b950672 266 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 267 return STp;
268}
269
270static void scsi_tape_put(struct scsi_tape *STp)
271{
272 struct scsi_device *sdev = STp->device;
273
0b950672 274 mutex_lock(&st_ref_mutex);
f03a5670
KM		 275 kref_put(&STp->kref, scsi_tape_release);
276 scsi_device_put(sdev);
0b950672 277 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 278}
279
1da177e4
LT		 280struct st_reject_data {
281 char *vendor;
282 char *model;
283 char *rev;
284 char *driver_hint; /* Name of the correct driver, NULL if unknown */
285};
286
287static struct st_reject_data reject_list[] = {
288 /* {"XXX", "Yy-", "", NULL}, example */
289 SIGS_FROM_OSST,
290 {NULL, }};
291
292/* If the device signature is on the list of incompatible drives, the
293 function returns a pointer to the name of the correct driver (if known) */
294static char * st_incompatible(struct scsi_device* SDp)
295{
296 struct st_reject_data *rp;
297
298 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
299 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
300 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
301 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
302 if (rp->driver_hint)
303 return rp->driver_hint;
304 else
305 return "unknown";
306 }
307 return NULL;
308}
309\f
310
311static inline char *tape_name(struct scsi_tape *tape)
312{
313 return tape->disk->disk_name;
314}
315
b30d8bca 316#define st_printk(prefix, t, fmt, a...) \
22e0d994 317 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
b30d8bca
HR		 318#ifdef DEBUG
319#define DEBC_printk(t, fmt, a...) \
320 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
321#else
322#define DEBC_printk(t, fmt, a...)
323#endif
1da177e4 324
8b05b773 325static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
1da177e4
LT		 326{
327 const u8 *ucp;
8b05b773 328 const u8 *sense = SRpnt->sense;
1da177e4 329
8b05b773
MC		 330 s->have_sense = scsi_normalize_sense(SRpnt->sense,
331 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
1da177e4
LT		 332 s->flags = 0;
333
334 if (s->have_sense) {
335 s->deferred = 0;
336 s->remainder_valid =
337 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
338 switch (sense[0] & 0x7f) {
339 case 0x71:
340 s->deferred = 1;
211d62a8 341 /* fall through */
1da177e4
LT		 342 case 0x70:
343 s->fixed_format = 1;
344 s->flags = sense[2] & 0xe0;
345 break;
346 case 0x73:
347 s->deferred = 1;
211d62a8 348 /* fall through */
1da177e4
LT		 349 case 0x72:
350 s->fixed_format = 0;
351 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
352 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
353 break;
354 }
355 }
356}
357
358
359/* Convert the result to success code */
8b05b773 360static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
1da177e4 361{
8b05b773 362 int result = SRpnt->result;
1da177e4
LT		 363 u8 scode;
364 DEB(const char *stp;)
365 char *name = tape_name(STp);
366 struct st_cmdstatus *cmdstatp;
367
368 if (!result)
369 return 0;
370
371 cmdstatp = &STp->buffer->cmdstat;
f03a5670 372 st_analyze_sense(SRpnt, cmdstatp);
1da177e4
LT		 373
374 if (cmdstatp->have_sense)
375 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
376 else
377 scode = 0;
378
b30d8bca
HR		 379 DEB(
380 if (debugging) {
381 st_printk(ST_DEB_MSG, STp,
382 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
383 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
384 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
1da177e4 385 if (cmdstatp->have_sense)
d811b848
HR		 386 __scsi_print_sense(STp->device, name,
387 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 388 } ) /* end DEB */
389 if (!debugging) { /* Abnormal conditions for tape */
390 if (!cmdstatp->have_sense)
b30d8bca
HR		 391 st_printk(KERN_WARNING, STp,
392 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
393 result, driver_byte(result), host_byte(result));
1da177e4
LT		 394 else if (cmdstatp->have_sense &&
395 scode != NO_SENSE &&
396 scode != RECOVERED_ERROR &&
397 /* scode != UNIT_ATTENTION && */
398 scode != BLANK_CHECK &&
399 scode != VOLUME_OVERFLOW &&
8b05b773
MC		 400 SRpnt->cmd[0] != MODE_SENSE &&
401 SRpnt->cmd[0] != TEST_UNIT_READY) {
4e73ea7b 402
d811b848
HR		 403 __scsi_print_sense(STp->device, name,
404 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 405 }
406 }
407
408 if (cmdstatp->fixed_format &&
409 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
410 if (STp->cln_sense_value)
8b05b773 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 412 STp->cln_sense_mask) == STp->cln_sense_value);
413 else
8b05b773 414 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 415 STp->cln_sense_mask) != 0);
416 }
417 if (cmdstatp->have_sense &&
418 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
419 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
420
421 STp->pos_unknown |= STp->device->was_reset;
422
423 if (cmdstatp->have_sense &&
424 scode == RECOVERED_ERROR
425#if ST_RECOVERED_WRITE_FATAL
8b05b773
MC		 426 && SRpnt->cmd[0] != WRITE_6
427 && SRpnt->cmd[0] != WRITE_FILEMARKS
1da177e4
LT		 428#endif
429 ) {
430 STp->recover_count++;
431 STp->recover_reg++;
432
b30d8bca 433 DEB(
1da177e4 434 if (debugging) {
8b05b773 435 if (SRpnt->cmd[0] == READ_6)
1da177e4 436 stp = "read";
8b05b773 437 else if (SRpnt->cmd[0] == WRITE_6)
1da177e4
LT		 438 stp = "write";
439 else
440 stp = "ioctl";
b30d8bca
HR		 441 st_printk(ST_DEB_MSG, STp,
442 "Recovered %s error (%d).\n",
443 stp, STp->recover_count);
1da177e4
LT		 444 } ) /* end DEB */
445
446 if (cmdstatp->flags == 0)
447 return 0;
448 }
449 return (-EIO);
450}
451
4deba245 452static struct st_request *st_allocate_request(struct scsi_tape *stp)
8b05b773 453{
4deba245
FT		 454 struct st_request *streq;
455
456 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
457 if (streq)
458 streq->stp = stp;
459 else {
b30d8bca
HR		 460 st_printk(KERN_ERR, stp,
461 "Can't get SCSI request.\n");
4deba245
FT		 462 if (signal_pending(current))
463 stp->buffer->syscall_result = -EINTR;
464 else
465 stp->buffer->syscall_result = -EBUSY;
466 }
467
468 return streq;
8b05b773
MC		 469}
470
471static void st_release_request(struct st_request *streq)
472{
473 kfree(streq);
1da177e4
LT		 474}
475
05545c92
SS		 476static void st_do_stats(struct scsi_tape *STp, struct request *req)
477{
478 ktime_t now;
479
480 now = ktime_get();
82ed4db4 481 if (scsi_req(req)->cmd[0] == WRITE_6) {
05545c92
SS		 482 now = ktime_sub(now, STp->stats->write_time);
483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
485 atomic64_inc(&STp->stats->write_cnt);
17d5363b 486 if (scsi_req(req)->result) {
05545c92
SS		 487 atomic64_add(atomic_read(&STp->stats->last_write_size)
488 - STp->buffer->cmdstat.residual,
489 &STp->stats->write_byte_cnt);
490 if (STp->buffer->cmdstat.residual > 0)
491 atomic64_inc(&STp->stats->resid_cnt);
492 } else
493 atomic64_add(atomic_read(&STp->stats->last_write_size),
494 &STp->stats->write_byte_cnt);
82ed4db4 495 } else if (scsi_req(req)->cmd[0] == READ_6) {
05545c92
SS		 496 now = ktime_sub(now, STp->stats->read_time);
497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
499 atomic64_inc(&STp->stats->read_cnt);
17d5363b 500 if (scsi_req(req)->result) {
05545c92
SS		 501 atomic64_add(atomic_read(&STp->stats->last_read_size)
502 - STp->buffer->cmdstat.residual,
503 &STp->stats->read_byte_cnt);
504 if (STp->buffer->cmdstat.residual > 0)
505 atomic64_inc(&STp->stats->resid_cnt);
506 } else
507 atomic64_add(atomic_read(&STp->stats->last_read_size),
508 &STp->stats->read_byte_cnt);
509 } else {
510 now = ktime_sub(now, STp->stats->other_time);
511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
512 atomic64_inc(&STp->stats->other_cnt);
513 }
514 atomic64_dec(&STp->stats->in_flight);
515}
516
2a842aca 517static void st_scsi_execute_end(struct request *req, blk_status_t status)
13b53b44
FT		 518{
519 struct st_request *SRpnt = req->end_io_data;
82ed4db4 520 struct scsi_request *rq = scsi_req(req);
13b53b44 521 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 522 struct bio *tmp;
13b53b44 523
17d5363b 524 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
82ed4db4 525 STp->buffer->cmdstat.residual = rq->resid_len;
13b53b44 526
05545c92
SS		 527 st_do_stats(STp, req);
528
c68bf8ee 529 tmp = SRpnt->bio;
82ed4db4
CH		 530 if (rq->sense_len)
531 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
13b53b44
FT		 532 if (SRpnt->waiting)
533 complete(SRpnt->waiting);
534
c68bf8ee 535 blk_rq_unmap_user(tmp);
92bc5a24 536 blk_put_request(req);
13b53b44
FT		 537}
538
539static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
540 int data_direction, void *buffer, unsigned bufflen,
541 int timeout, int retries)
542{
543 struct request *req;
82ed4db4 544 struct scsi_request *rq;
13b53b44
FT		 545 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
546 int err = 0;
05545c92 547 struct scsi_tape *STp = SRpnt->stp;
13b53b44 548
aebf526b
CH		 549 req = blk_get_request(SRpnt->stp->device->request_queue,
550 data_direction == DMA_TO_DEVICE ?
ff005a06 551 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
a492f075 552 if (IS_ERR(req))
13b53b44 553 return DRIVER_ERROR << 24;
82ed4db4 554 rq = scsi_req(req);
e8064021 555 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 556
557 mdata->null_mapped = 1;
558
02ae2c0e
KM		 559 if (bufflen) {
560 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
561 GFP_KERNEL);
562 if (err) {
563 blk_put_request(req);
564 return DRIVER_ERROR << 24;
565 }
13b53b44
FT		 566 }
567
05545c92
SS		 568 atomic64_inc(&STp->stats->in_flight);
569 if (cmd[0] == WRITE_6) {
570 atomic_set(&STp->stats->last_write_size, bufflen);
571 STp->stats->write_time = ktime_get();
572 } else if (cmd[0] == READ_6) {
573 atomic_set(&STp->stats->last_read_size, bufflen);
574 STp->stats->read_time = ktime_get();
575 } else {
576 STp->stats->other_time = ktime_get();
577 }
578
13b53b44 579 SRpnt->bio = req->bio;
82ed4db4
CH		 580 rq->cmd_len = COMMAND_SIZE(cmd[0]);
581 memset(rq->cmd, 0, BLK_MAX_CDB);
582 memcpy(rq->cmd, cmd, rq->cmd_len);
13b53b44 583 req->timeout = timeout;
64c7f1d1 584 rq->retries = retries;
13b53b44
FT		 585 req->end_io_data = SRpnt;
586
587 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
588 return 0;
589}
590
1da177e4
LT		 591/* Do the scsi command. Waits until command performed if do_wait is true.
592 Otherwise write_behind_check() is used to check that the command
593 has finished. */
8b05b773
MC		 594static struct st_request *
595st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 596 int bytes, int direction, int timeout, int retries, int do_wait)
597{
f03a5670 598 struct completion *waiting;
6d476267
FT		 599 struct rq_map_data *mdata = &STp->buffer->map_data;
600 int ret;
1da177e4 601
f03a5670
KM		 602 /* if async, make sure there's no command outstanding */
603 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 604 st_printk(KERN_ERR, STp,
605 "Async command already active.\n");
f03a5670
KM		 606 if (signal_pending(current))
607 (STp->buffer)->syscall_result = (-EINTR);
608 else
609 (STp->buffer)->syscall_result = (-EBUSY);
610 return NULL;
611 }
612
4deba245
FT		 613 if (!SRpnt) {
614 SRpnt = st_allocate_request(STp);
615 if (!SRpnt)
1da177e4 616 return NULL;
1da177e4
LT		 617 }
618
f03a5670
KM		 619 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
620 which IO is outstanding. It's nulled out when the IO completes. */
621 if (!do_wait)
622 (STp->buffer)->last_SRpnt = SRpnt;
623
624 waiting = &STp->wait;
625 init_completion(waiting);
8b05b773 626 SRpnt->waiting = waiting;
1da177e4 627
6620742f 628 if (STp->buffer->do_dio) {
c982c368 629 mdata->page_order = 0;
6620742f
FT		 630 mdata->nr_entries = STp->buffer->sg_segs;
631 mdata->pages = STp->buffer->mapped_pages;
632 } else {
c982c368 633 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 634 mdata->nr_entries =
635 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 636 mdata->pages = STp->buffer->reserved_pages;
637 mdata->offset = 0;
6d476267
FT		 638 }
639
8b05b773
MC		 640 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
641 STp->buffer->cmdstat.have_sense = 0;
642 STp->buffer->syscall_result = 0;
643
6620742f
FT		 644 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
645 retries);
6d476267 646 if (ret) {
8b05b773
MC		 647 /* could not allocate the buffer or request was too large */
648 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 649 (STp->buffer)->last_SRpnt = NULL;
6d476267 650 } else if (do_wait) {
f03a5670 651 wait_for_completion(waiting);
8b05b773 652 SRpnt->waiting = NULL;
1da177e4
LT		 653 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
654 }
8b05b773 655
1da177e4
LT		 656 return SRpnt;
657}
658
659
660/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
661 write has been correct but EOM early warning reached, -EIO if write ended in
662 error or zero if write successful. Asynchronous writes are used only in
663 variable block mode. */
664static int write_behind_check(struct scsi_tape * STp)
665{
666 int retval = 0;
667 struct st_buffer *STbuffer;
668 struct st_partstat *STps;
669 struct st_cmdstatus *cmdstatp;
8b05b773 670 struct st_request *SRpnt;
1da177e4
LT		 671
672 STbuffer = STp->buffer;
673 if (!STbuffer->writing)
674 return 0;
675
b30d8bca 676 DEB(
1da177e4
LT		 677 if (STp->write_pending)
678 STp->nbr_waits++;
679 else
680 STp->nbr_finished++;
b30d8bca 681 ) /* end DEB */
1da177e4
LT		 682
683 wait_for_completion(&(STp->wait));
f03a5670
KM		 684 SRpnt = STbuffer->last_SRpnt;
685 STbuffer->last_SRpnt = NULL;
8b05b773 686 SRpnt->waiting = NULL;
1da177e4 687
f03a5670 688 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 689 st_release_request(SRpnt);
1da177e4
LT		 690
691 STbuffer->buffer_bytes -= STbuffer->writing;
692 STps = &(STp->ps[STp->partition]);
693 if (STps->drv_block >= 0) {
694 if (STp->block_size == 0)
695 STps->drv_block++;
696 else
697 STps->drv_block += STbuffer->writing / STp->block_size;
698 }
699
700 cmdstatp = &STbuffer->cmdstat;
701 if (STbuffer->syscall_result) {
702 retval = -EIO;
703 if (cmdstatp->have_sense && !cmdstatp->deferred &&
704 (cmdstatp->flags & SENSE_EOM) &&
705 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
706 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
707 /* EOM at write-behind, has all data been written? */
708 if (!cmdstatp->remainder_valid ||
709 cmdstatp->uremainder64 == 0)
710 retval = -ENOSPC;
711 }
712 if (retval == -EIO)
713 STps->drv_block = -1;
714 }
715 STbuffer->writing = 0;
716
717 DEB(if (debugging && retval)
b30d8bca
HR		 718 st_printk(ST_DEB_MSG, STp,
719 "Async write error %x, return value %d.\n",
720 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 721
722 return retval;
723}
724
725
726/* Step over EOF if it has been inadvertently crossed (ioctl not used because
727 it messes up the block number). */
728static int cross_eof(struct scsi_tape * STp, int forward)
729{
8b05b773 730 struct st_request *SRpnt;
1da177e4
LT		 731 unsigned char cmd[MAX_COMMAND_SIZE];
732
733 cmd[0] = SPACE;
734 cmd[1] = 0x01; /* Space FileMarks */
735 if (forward) {
736 cmd[2] = cmd[3] = 0;
737 cmd[4] = 1;
738 } else
739 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
740 cmd[5] = 0;
741
b30d8bca
HR		 742 DEBC_printk(STp, "Stepping over filemark %s.\n",
743 forward ? "forward" : "backward");
1da177e4 744
02ae2c0e
KM		 745 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
746 STp->device->request_queue->rq_timeout,
747 MAX_RETRIES, 1);
1da177e4 748 if (!SRpnt)
02ae2c0e 749 return (STp->buffer)->syscall_result;
39ade4b1 750
02ae2c0e
KM		 751 st_release_request(SRpnt);
752 SRpnt = NULL;
1da177e4
LT		 753
754 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 755 st_printk(KERN_ERR, STp,
756 "Stepping over filemark %s failed.\n",
757 forward ? "forward" : "backward");
1da177e4 758
02ae2c0e 759 return (STp->buffer)->syscall_result;
1da177e4
LT		 760}
761
762
763/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 764static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 765{
786231af 766 int transfer, blks;
1da177e4
LT		 767 int result;
768 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 769 struct st_request *SRpnt;
1da177e4
LT		 770 struct st_partstat *STps;
771
772 result = write_behind_check(STp);
773 if (result)
774 return result;
775
776 result = 0;
777 if (STp->dirty == 1) {
778
786231af 779 transfer = STp->buffer->buffer_bytes;
b30d8bca 780 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 781
1da177e4
LT		 782 memset(cmd, 0, MAX_COMMAND_SIZE);
783 cmd[0] = WRITE_6;
784 cmd[1] = 1;
785 blks = transfer / STp->block_size;
786 cmd[2] = blks >> 16;
787 cmd[3] = blks >> 8;
788 cmd[4] = blks;
789
790 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 791 STp->device->request_queue->rq_timeout,
792 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 793 if (!SRpnt)
794 return (STp->buffer)->syscall_result;
795
796 STps = &(STp->ps[STp->partition]);
797 if ((STp->buffer)->syscall_result != 0) {
798 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
799
800 if (cmdstatp->have_sense && !cmdstatp->deferred &&
801 (cmdstatp->flags & SENSE_EOM) &&
802 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
803 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
804 (!cmdstatp->remainder_valid ||
805 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
806 STp->dirty = 0;
807 (STp->buffer)->buffer_bytes = 0;
808 if (STps->drv_block >= 0)
809 STps->drv_block += blks;
810 result = (-ENOSPC);
811 } else {
b30d8bca 812 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 813 STps->drv_block = (-1);
814 result = (-EIO);
815 }
816 } else {
817 if (STps->drv_block >= 0)
818 STps->drv_block += blks;
819 STp->dirty = 0;
820 (STp->buffer)->buffer_bytes = 0;
821 }
8b05b773 822 st_release_request(SRpnt);
1da177e4
LT		 823 SRpnt = NULL;
824 }
825 return result;
826}
827
828
829/* Flush the tape buffer. The tape will be positioned correctly unless
830 seek_next is true. */
831static int flush_buffer(struct scsi_tape *STp, int seek_next)
832{
833 int backspace, result;
1da177e4
LT		 834 struct st_partstat *STps;
835
1da177e4
LT		 836 /*
837 * If there was a bus reset, block further access
838 * to this device.
839 */
840 if (STp->pos_unknown)
841 return (-EIO);
842
843 if (STp->ready != ST_READY)
844 return 0;
845 STps = &(STp->ps[STp->partition]);
846 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 847 return st_flush_write_buffer(STp);
1da177e4
LT		 848
849 if (STp->block_size == 0)
850 return 0;
851
852 backspace = ((STp->buffer)->buffer_bytes +
853 (STp->buffer)->read_pointer) / STp->block_size -
854 ((STp->buffer)->read_pointer + STp->block_size - 1) /
855 STp->block_size;
856 (STp->buffer)->buffer_bytes = 0;
857 (STp->buffer)->read_pointer = 0;
858 result = 0;
859 if (!seek_next) {
860 if (STps->eof == ST_FM_HIT) {
861 result = cross_eof(STp, 0); /* Back over the EOF hit */
862 if (!result)
863 STps->eof = ST_NOEOF;
864 else {
865 if (STps->drv_file >= 0)
866 STps->drv_file++;
867 STps->drv_block = 0;
868 }
869 }
870 if (!result && backspace > 0)
871 result = st_int_ioctl(STp, MTBSR, backspace);
872 } else if (STps->eof == ST_FM_HIT) {
873 if (STps->drv_file >= 0)
874 STps->drv_file++;
875 STps->drv_block = 0;
876 STps->eof = ST_NOEOF;
877 }
878 return result;
879
880}
881\f
882/* Set the mode parameters */
883static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
884{
885 int set_it = 0;
886 unsigned long arg;
1da177e4
LT		 887
888 if (!STp->density_changed &&
889 STm->default_density >= 0 &&
890 STm->default_density != STp->density) {
891 arg = STm->default_density;
892 set_it = 1;
893 } else
894 arg = STp->density;
895 arg <<= MT_ST_DENSITY_SHIFT;
896 if (!STp->blksize_changed &&
897 STm->default_blksize >= 0 &&
898 STm->default_blksize != STp->block_size) {
899 arg |= STm->default_blksize;
900 set_it = 1;
901 } else
902 arg |= STp->block_size;
903 if (set_it &&
904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
b30d8bca
HR		 905 st_printk(KERN_WARNING, STp,
906 "Can't set default block size to %d bytes "
907 "and density %x.\n",
908 STm->default_blksize, STm->default_density);
1da177e4
LT		 909 if (modes_defined)
910 return (-EINVAL);
911 }
912 return 0;
913}
914
915
8b05b773 916/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 917static int do_door_lock(struct scsi_tape * STp, int do_lock)
918{
dccfa688 919 int retval;
1da177e4 920
b30d8bca 921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
dccfa688
CH		 922
923 retval = scsi_set_medium_removal(STp->device,
924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
925 if (!retval)
1da177e4 926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
dccfa688 927 else
1da177e4 928 STp->door_locked = ST_LOCK_FAILS;
1da177e4
LT		 929 return retval;
930}
931
932
933/* Set the internal state after reset */
934static void reset_state(struct scsi_tape *STp)
935{
936 int i;
937 struct st_partstat *STps;
938
939 STp->pos_unknown = 0;
940 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
941 STps = &(STp->ps[i]);
942 STps->rw = ST_IDLE;
943 STps->eof = ST_NOEOF;
944 STps->at_sm = 0;
945 STps->last_block_valid = 0;
946 STps->drv_block = -1;
947 STps->drv_file = -1;
948 }
949 if (STp->can_partitions) {
950 STp->partition = find_partition(STp);
951 if (STp->partition < 0)
952 STp->partition = 0;
953 STp->new_partition = STp->partition;
954 }
955}
956\f
957/* Test if the drive is ready. Returns either one of the codes below or a negative system
958 error code. */
959#define CHKRES_READY 0
960#define CHKRES_NEW_SESSION 1
961#define CHKRES_NOT_READY 2
962#define CHKRES_NO_TAPE 3
963
964#define MAX_ATTENTIONS 10
965
966static int test_ready(struct scsi_tape *STp, int do_wait)
967{
968 int attentions, waits, max_wait, scode;
969 int retval = CHKRES_READY, new_session = 0;
970 unsigned char cmd[MAX_COMMAND_SIZE];
02ae2c0e 971 struct st_request *SRpnt = NULL;
1da177e4
LT		 972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
973
974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
975
976 for (attentions=waits=0; ; ) {
977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
978 cmd[0] = TEST_UNIT_READY;
02ae2c0e
KM		 979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
980 STp->long_timeout, MAX_READY_RETRIES, 1);
1da177e4 981
02ae2c0e
KM		 982 if (!SRpnt) {
983 retval = (STp->buffer)->syscall_result;
1da177e4 984 break;
02ae2c0e 985 }
1da177e4
LT		 986
987 if (cmdstatp->have_sense) {
988
989 scode = cmdstatp->sense_hdr.sense_key;
990
991 if (scode == UNIT_ATTENTION) { /* New media? */
992 new_session = 1;
993 if (attentions < MAX_ATTENTIONS) {
994 attentions++;
995 continue;
996 }
997 else {
998 retval = (-EIO);
999 break;
1000 }
1001 }
1002
1003 if (scode == NOT_READY) {
1004 if (waits < max_wait) {
1005 if (msleep_interruptible(1000)) {
1006 retval = (-EINTR);
1007 break;
1008 }
1009 waits++;
1010 continue;
1011 }
1012 else {
1013 if ((STp->device)->scsi_level >= SCSI_2 &&
1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1015 retval = CHKRES_NO_TAPE;
1016 else
1017 retval = CHKRES_NOT_READY;
1018 break;
1019 }
1020 }
1021 }
1022
1023 retval = (STp->buffer)->syscall_result;
1024 if (!retval)
1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1026 break;
1027 }
1028
02ae2c0e
KM		 1029 if (SRpnt != NULL)
1030 st_release_request(SRpnt);
1da177e4
LT		 1031 return retval;
1032}
1033
1034
1035/* See if the drive is ready and gather information about the tape. Return values:
1036 < 0 negative error code from errno.h
1037 0 drive ready
1038 1 drive not ready (possibly no tape)
1039*/
1040static int check_tape(struct scsi_tape *STp, struct file *filp)
1041{
1042 int i, retval, new_session = 0, do_wait;
1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1044 unsigned short st_flags = filp->f_flags;
8b05b773 1045 struct st_request *SRpnt = NULL;
1da177e4
LT		 1046 struct st_modedef *STm;
1047 struct st_partstat *STps;
496ad9aa 1048 struct inode *inode = file_inode(filp);
1da177e4
LT		 1049 int mode = TAPE_MODE(inode);
1050
1051 STp->ready = ST_READY;
1052
1053 if (mode != STp->current_mode) {
b30d8bca
HR		 1054 DEBC_printk(STp, "Mode change from %d to %d.\n",
1055 STp->current_mode, mode);
1da177e4
LT		 1056 new_session = 1;
1057 STp->current_mode = mode;
1058 }
1059 STm = &(STp->modes[STp->current_mode]);
1060
1061 saved_cleaning = STp->cleaning_req;
1062 STp->cleaning_req = 0;
1063
1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1065 retval = test_ready(STp, do_wait);
1066
1067 if (retval < 0)
1068 goto err_out;
1069
1070 if (retval == CHKRES_NEW_SESSION) {
1071 STp->pos_unknown = 0;
1072 STp->partition = STp->new_partition = 0;
1073 if (STp->can_partitions)
1074 STp->nbr_partitions = 1; /* This guess will be updated later
1075 if necessary */
1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1077 STps = &(STp->ps[i]);
1078 STps->rw = ST_IDLE;
1079 STps->eof = ST_NOEOF;
1080 STps->at_sm = 0;
1081 STps->last_block_valid = 0;
1082 STps->drv_block = 0;
1083 STps->drv_file = 0;
1084 }
1085 new_session = 1;
1086 }
1087 else {
1088 STp->cleaning_req |= saved_cleaning;
1089
1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1091 if (retval == CHKRES_NO_TAPE)
1092 STp->ready = ST_NO_TAPE;
1093 else
1094 STp->ready = ST_NOT_READY;
1095
1096 STp->density = 0; /* Clear the erroneous "residue" */
1097 STp->write_prot = 0;
1098 STp->block_size = 0;
1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1100 STp->partition = STp->new_partition = 0;
1101 STp->door_locked = ST_UNLOCKED;
1102 return CHKRES_NOT_READY;
1103 }
1104 }
1105
1106 if (STp->omit_blklims)
1107 STp->min_block = STp->max_block = (-1);
1108 else {
1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1110 cmd[0] = READ_BLOCK_LIMITS;
1111
02ae2c0e
KM		 1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1113 STp->device->request_queue->rq_timeout,
1114 MAX_READY_RETRIES, 1);
1115 if (!SRpnt) {
1116 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1117 goto err_out;
1118 }
1119
8b05b773 1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1124 (STp->buffer)->b_data[5];
1125 if ( DEB( debugging || ) !STp->inited)
b30d8bca
HR		 1126 st_printk(KERN_INFO, STp,
1127 "Block limits %d - %d bytes.\n",
1128 STp->min_block, STp->max_block);
1da177e4
LT		 1129 } else {
1130 STp->min_block = STp->max_block = (-1);
b30d8bca 1131 DEBC_printk(STp, "Can't read block limits.\n");
1da177e4
LT		 1132 }
1133 }
1134
1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1136 cmd[0] = MODE_SENSE;
1137 cmd[4] = 12;
1138
02ae2c0e
KM		 1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1140 STp->device->request_queue->rq_timeout,
1141 MAX_READY_RETRIES, 1);
1142 if (!SRpnt) {
1143 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1144 goto err_out;
1145 }
1146
1147 if ((STp->buffer)->syscall_result != 0) {
b30d8bca 1148 DEBC_printk(STp, "No Mode Sense.\n");
1da177e4
LT		 1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1151 STp->drv_write_prot = 0;
1152 } else {
b30d8bca
HR		 1153 DEBC_printk(STp,"Mode sense. Length %d, "
1154 "medium %x, WBS %x, BLL %d\n",
1155 (STp->buffer)->b_data[0],
1156 (STp->buffer)->b_data[1],
1157 (STp->buffer)->b_data[2],
1158 (STp->buffer)->b_data[3]);
1da177e4
LT		 1159
1160 if ((STp->buffer)->b_data[3] >= 8) {
1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1162 STp->density = (STp->buffer)->b_data[4];
1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
b30d8bca
HR		 1165 DEBC_printk(STp, "Density %x, tape length: %x, "
1166 "drv buffer: %d\n",
1167 STp->density,
1168 (STp->buffer)->b_data[5] * 65536 +
1169 (STp->buffer)->b_data[6] * 256 +
1170 (STp->buffer)->b_data[7],
1171 STp->drv_buffer);
1da177e4
LT		 1172 }
1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
c743e44f 1174 if (!STp->drv_buffer && STp->immediate_filemark) {
b30d8bca
HR		 1175 st_printk(KERN_WARNING, STp,
1176 "non-buffered tape: disabling "
1177 "writing immediate filemarks\n");
c743e44f
LD		 1178 STp->immediate_filemark = 0;
1179 }
1da177e4 1180 }
8b05b773 1181 st_release_request(SRpnt);
1da177e4 1182 SRpnt = NULL;
b30d8bca 1183 STp->inited = 1;
1da177e4
LT		 1184
1185 if (STp->block_size > 0)
1186 (STp->buffer)->buffer_blocks =
b30d8bca 1187 (STp->buffer)->buffer_size / STp->block_size;
1da177e4
LT		 1188 else
1189 (STp->buffer)->buffer_blocks = 1;
1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1191
b30d8bca
HR		 1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1193 STp->block_size, (STp->buffer)->buffer_size,
1194 (STp->buffer)->buffer_blocks);
1da177e4
LT		 1195
1196 if (STp->drv_write_prot) {
1197 STp->write_prot = 1;
1198
b30d8bca 1199 DEBC_printk(STp, "Write protected\n");
1da177e4
LT		 1200
1201 if (do_wait &&
1202 ((st_flags & O_ACCMODE) == O_WRONLY ||
1203 (st_flags & O_ACCMODE) == O_RDWR)) {
1204 retval = (-EROFS);
1205 goto err_out;
1206 }
1207 }
1208
1209 if (STp->can_partitions && STp->nbr_partitions < 1) {
1210 /* This code is reached when the device is opened for the first time
1211 after the driver has been initialized with tape in the drive and the
1212 partition support has been enabled. */
b30d8bca 1213 DEBC_printk(STp, "Updating partition number in status.\n");
1da177e4
LT		 1214 if ((STp->partition = find_partition(STp)) < 0) {
1215 retval = STp->partition;
1216 goto err_out;
1217 }
1218 STp->new_partition = STp->partition;
1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1220 }
1221
1222 if (new_session) { /* Change the drive parameters for the new mode */
1223 STp->density_changed = STp->blksize_changed = 0;
1224 STp->compression_changed = 0;
1225 if (!(STm->defaults_for_writes) &&
1226 (retval = set_mode_densblk(STp, STm)) < 0)
1227 goto err_out;
1228
1229 if (STp->default_drvbuffer != 0xff) {
1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
b30d8bca
HR		 1231 st_printk(KERN_WARNING, STp,
1232 "Can't set default drive "
1233 "buffering to %d.\n",
1234 STp->default_drvbuffer);
1da177e4
LT		 1235 }
1236 }
1237
1238 return CHKRES_READY;
1239
1240 err_out:
1241 return retval;
1242}
1243
1244
b3369c68 1245\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1246 module count. */
1247static int st_open(struct inode *inode, struct file *filp)
1248{
1249 int i, retval = (-EIO);
46a243f7 1250 int resumed = 0;
1da177e4
LT		 1251 struct scsi_tape *STp;
1252 struct st_partstat *STps;
1253 int dev = TAPE_NR(inode);
1da177e4
LT		 1254
1255 /*
1256 * We really want to do nonseekable_open(inode, filp); here, but some
1257 * versions of tar incorrectly call lseek on tapes and bail out if that
1258 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1259 */
1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1261
b3369c68 1262 if (!(STp = scsi_tape_get(dev))) {
f03a5670 1263 return -ENXIO;
b3369c68 1264 }
f03a5670 1265
1da177e4 1266 filp->private_data = STp;
1da177e4 1267
6c648d95 1268 spin_lock(&st_use_lock);
1da177e4 1269 if (STp->in_use) {
6c648d95 1270 spin_unlock(&st_use_lock);
f03a5670 1271 scsi_tape_put(STp);
b30d8bca 1272 DEBC_printk(STp, "Device already in use.\n");
1da177e4
LT		 1273 return (-EBUSY);
1274 }
1275
1da177e4 1276 STp->in_use = 1;
6c648d95 1277 spin_unlock(&st_use_lock);
1da177e4
LT		 1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1279
46a243f7
ON		 1280 if (scsi_autopm_get_device(STp->device) < 0) {
1281 retval = -EIO;
1282 goto err_out;
1283 }
1284 resumed = 1;
1da177e4
LT		 1285 if (!scsi_block_when_processing_errors(STp->device)) {
1286 retval = (-ENXIO);
1287 goto err_out;
1288 }
1289
1290 /* See that we have at least a one page buffer available */
1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
b30d8bca
HR		 1292 st_printk(KERN_WARNING, STp,
1293 "Can't allocate one page tape buffer.\n");
1da177e4
LT		 1294 retval = (-EOVERFLOW);
1295 goto err_out;
1296 }
1297
40f6b36c 1298 (STp->buffer)->cleared = 0;
1da177e4
LT		 1299 (STp->buffer)->writing = 0;
1300 (STp->buffer)->syscall_result = 0;
1301
1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1303
1304 STp->dirty = 0;
1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1306 STps = &(STp->ps[i]);
1307 STps->rw = ST_IDLE;
1308 }
9abe16c6 1309 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1310 STp->recover_count = 0;
1311 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1313
1314 retval = check_tape(STp, filp);
1315 if (retval < 0)
1316 goto err_out;
1317 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1318 retval != CHKRES_READY) {
413f7327
KM		 1319 if (STp->ready == NO_TAPE)
1320 retval = (-ENOMEDIUM);
1321 else
1322 retval = (-EIO);
1da177e4
LT		 1323 goto err_out;
1324 }
1325 return 0;
1326
1327 err_out:
1328 normalize_buffer(STp->buffer);
0644f539 1329 spin_lock(&st_use_lock);
1da177e4 1330 STp->in_use = 0;
0644f539 1331 spin_unlock(&st_use_lock);
46a243f7
ON		 1332 if (resumed)
1333 scsi_autopm_put_device(STp->device);
e7ac6c66 1334 scsi_tape_put(STp);
1da177e4
LT		 1335 return retval;
1336
1337}
1338\f
1339
1340/* Flush the tape buffer before close */
75e1fcc0 1341static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1342{
1343 int result = 0, result2;
1344 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1345 struct st_request *SRpnt;
1da177e4
LT		 1346 struct scsi_tape *STp = filp->private_data;
1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1348 struct st_partstat *STps = &(STp->ps[STp->partition]);
1da177e4
LT		 1349
1350 if (file_count(filp) > 1)
1351 return 0;
1352
1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1354 result = st_flush_write_buffer(STp);
1da177e4
LT		 1355 if (result != 0 && result != (-ENOSPC))
1356 goto out;
1357 }
1358
1359 if (STp->can_partitions &&
1360 (result2 = switch_partition(STp)) < 0) {
b30d8bca 1361 DEBC_printk(STp, "switch_partition at close failed.\n");
1da177e4
LT		 1362 if (result == 0)
1363 result = result2;
1364 goto out;
1365 }
1366
1367 DEBC( if (STp->nbr_requests)
b30d8bca
HR		 1368 st_printk(KERN_DEBUG, STp,
1369 "Number of r/w requests %d, dio used in %d, "
1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1371 STp->nbr_pages));
1da177e4
LT		 1372
1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1375
b30d8bca
HR		 1376#if DEBUG
1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1378 STp->nbr_waits, STp->nbr_finished);
1379#endif
1da177e4
LT		 1380 memset(cmd, 0, MAX_COMMAND_SIZE);
1381 cmd[0] = WRITE_FILEMARKS;
c743e44f
LD		 1382 if (STp->immediate_filemark)
1383 cmd[1] = 1;
1da177e4
LT		 1384 cmd[4] = 1 + STp->two_fm;
1385
02ae2c0e
KM		 1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1387 STp->device->request_queue->rq_timeout,
1388 MAX_WRITE_RETRIES, 1);
1da177e4 1389 if (!SRpnt) {
02ae2c0e 1390 result = (STp->buffer)->syscall_result;
1da177e4
LT		 1391 goto out;
1392 }
1393
1394 if (STp->buffer->syscall_result == 0 ||
1395 (cmdstatp->have_sense && !cmdstatp->deferred &&
1396 (cmdstatp->flags & SENSE_EOM) &&
1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1400 /* Write successful at EOM */
8b05b773 1401 st_release_request(SRpnt);
1da177e4
LT		 1402 SRpnt = NULL;
1403 if (STps->drv_file >= 0)
1404 STps->drv_file++;
1405 STps->drv_block = 0;
1406 if (STp->two_fm)
1407 cross_eof(STp, 0);
1408 STps->eof = ST_FM;
1409 }
1410 else { /* Write error */
8b05b773 1411 st_release_request(SRpnt);
1da177e4 1412 SRpnt = NULL;
b30d8bca
HR		 1413 st_printk(KERN_ERR, STp,
1414 "Error on write filemark.\n");
1da177e4
LT		 1415 if (result == 0)
1416 result = (-EIO);
1417 }
1418
b30d8bca 1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1da177e4
LT		 1420 } else if (!STp->rew_at_close) {
1421 STps = &(STp->ps[STp->partition]);
1422 if (!STm->sysv || STps->rw != ST_READING) {
1423 if (STp->can_bsr)
1424 result = flush_buffer(STp, 0);
1425 else if (STps->eof == ST_FM_HIT) {
1426 result = cross_eof(STp, 0);
1427 if (result) {
1428 if (STps->drv_file >= 0)
1429 STps->drv_file++;
1430 STps->drv_block = 0;
1431 STps->eof = ST_FM;
1432 } else
1433 STps->eof = ST_NOEOF;
1434 }
1435 } else if ((STps->eof == ST_NOEOF &&
1436 !(result = cross_eof(STp, 1))) ||
1437 STps->eof == ST_FM_HIT) {
1438 if (STps->drv_file >= 0)
1439 STps->drv_file++;
1440 STps->drv_block = 0;
1441 STps->eof = ST_FM;
1442 }
1443 }
1444
1445 out:
1446 if (STp->rew_at_close) {
1447 result2 = st_int_ioctl(STp, MTREW, 1);
1448 if (result == 0)
1449 result = result2;
1450 }
1451 return result;
1452}
1453
1454
1455/* Close the device and release it. BKL is not needed: this is the only thread
1456 accessing this tape. */
1457static int st_release(struct inode *inode, struct file *filp)
1458{
1459 int result = 0;
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
LT		 1471
1472 return result;
1473}
1474\f
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
1da177e4
LT		 2683 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2684 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2685 if (direction)
2686 sc = -sc;
b30d8bca
HR		 2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2688 direction ? "backward" : "forward", sc, units);
1da177e4 2689}
b30d8bca
HR		 2690#else
2691#define ST_DEB_FORWARD 0
2692#define ST_DEB_BACKWARD 1
2693static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2694#endif
2695
2696
2697/* Internal ioctl function */
2698static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2699{
2700 int timeout;
2701 long ltmp;
2702 int ioctl_result;
2703 int chg_eof = 1;
2704 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2705 struct st_request *SRpnt;
1da177e4
LT		 2706 struct st_partstat *STps;
2707 int fileno, blkno, at_sm, undone;
2708 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2709
2710 WARN_ON(STp->buffer->do_dio != 0);
2711 if (STp->ready != ST_READY) {
2712 if (STp->ready == ST_NO_TAPE)
2713 return (-ENOMEDIUM);
2714 else
2715 return (-EIO);
2716 }
2717 timeout = STp->long_timeout;
2718 STps = &(STp->ps[STp->partition]);
2719 fileno = STps->drv_file;
2720 blkno = STps->drv_block;
2721 at_sm = STps->at_sm;
2722
2723 memset(cmd, 0, MAX_COMMAND_SIZE);
2724 switch (cmd_in) {
2725 case MTFSFM:
2726 chg_eof = 0; /* Changed from the FSF after this */
211d62a8 2727 /* fall through */
1da177e4
LT		 2728 case MTFSF:
2729 cmd[0] = SPACE;
2730 cmd[1] = 0x01; /* Space FileMarks */
2731 cmd[2] = (arg >> 16);
2732 cmd[3] = (arg >> 8);
2733 cmd[4] = arg;
b30d8bca 2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2735 if (fileno >= 0)
2736 fileno += arg;
2737 blkno = 0;
2738 at_sm &= (arg == 0);
2739 break;
2740 case MTBSFM:
2741 chg_eof = 0; /* Changed from the FSF after this */
211d62a8 2742 /* fall through */
1da177e4
LT		 2743 case MTBSF:
2744 cmd[0] = SPACE;
2745 cmd[1] = 0x01; /* Space FileMarks */
2746 ltmp = (-arg);
2747 cmd[2] = (ltmp >> 16);
2748 cmd[3] = (ltmp >> 8);
2749 cmd[4] = ltmp;
b30d8bca 2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2751 if (fileno >= 0)
2752 fileno -= arg;
2753 blkno = (-1); /* We can't know the block number */
2754 at_sm &= (arg == 0);
2755 break;
2756 case MTFSR:
2757 cmd[0] = SPACE;
2758 cmd[1] = 0x00; /* Space Blocks */
2759 cmd[2] = (arg >> 16);
2760 cmd[3] = (arg >> 8);
2761 cmd[4] = arg;
b30d8bca 2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2763 if (blkno >= 0)
2764 blkno += arg;
2765 at_sm &= (arg == 0);
2766 break;
2767 case MTBSR:
2768 cmd[0] = SPACE;
2769 cmd[1] = 0x00; /* Space Blocks */
2770 ltmp = (-arg);
2771 cmd[2] = (ltmp >> 16);
2772 cmd[3] = (ltmp >> 8);
2773 cmd[4] = ltmp;
b30d8bca 2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2775 if (blkno >= 0)
2776 blkno -= arg;
2777 at_sm &= (arg == 0);
2778 break;
2779 case MTFSS:
2780 cmd[0] = SPACE;
2781 cmd[1] = 0x04; /* Space Setmarks */
2782 cmd[2] = (arg >> 16);
2783 cmd[3] = (arg >> 8);
2784 cmd[4] = arg;
b30d8bca 2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2786 if (arg != 0) {
2787 blkno = fileno = (-1);
2788 at_sm = 1;
2789 }
2790 break;
2791 case MTBSS:
2792 cmd[0] = SPACE;
2793 cmd[1] = 0x04; /* Space Setmarks */
2794 ltmp = (-arg);
2795 cmd[2] = (ltmp >> 16);
2796 cmd[3] = (ltmp >> 8);
2797 cmd[4] = ltmp;
b30d8bca 2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2799 if (arg != 0) {
2800 blkno = fileno = (-1);
2801 at_sm = 1;
2802 }
2803 break;
2804 case MTWEOF:
3e51d3c9 2805 case MTWEOFI:
1da177e4
LT		 2806 case MTWSM:
2807 if (STp->write_prot)
2808 return (-EACCES);
2809 cmd[0] = WRITE_FILEMARKS;
2810 if (cmd_in == MTWSM)
2811 cmd[1] = 2;
c743e44f
LD		 2812 if (cmd_in == MTWEOFI ||
2813 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2814 cmd[1] |= 1;
1da177e4
LT		 2815 cmd[2] = (arg >> 16);
2816 cmd[3] = (arg >> 8);
2817 cmd[4] = arg;
a02488ed 2818 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2819 DEBC(
2820 if (cmd_in != MTWSM)
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d filemarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 else
2827 st_printk(ST_DEB_MSG, STp,
2828 "Writing %d setmarks.\n",
2829 cmd[2] * 65536 +
2830 cmd[3] * 256 +
2831 cmd[4]);
1da177e4
LT		 2832 )
2833 if (fileno >= 0)
2834 fileno += arg;
2835 blkno = 0;
2836 at_sm = (cmd_in == MTWSM);
2837 break;
2838 case MTREW:
2839 cmd[0] = REZERO_UNIT;
2840 if (STp->immediate) {
2841 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2842 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2843 }
b30d8bca 2844 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2845 fileno = blkno = at_sm = 0;
2846 break;
2847 case MTNOP:
b30d8bca 2848 DEBC_printk(STp, "No op on tape.\n");
1da177e4
LT		 2849 return 0; /* Should do something ? */
2850 break;
2851 case MTRETEN:
2852 cmd[0] = START_STOP;
2853 if (STp->immediate) {
2854 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2855 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2856 }
2857 cmd[4] = 3;
b30d8bca 2858 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2859 fileno = blkno = at_sm = 0;
2860 break;
2861 case MTEOM:
2862 if (!STp->fast_mteom) {
2863 /* space to the end of tape */
2864 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2865 fileno = STps->drv_file;
2866 if (STps->eof >= ST_EOD_1)
2867 return 0;
2868 /* The next lines would hide the number of spaced FileMarks
2869 That's why I inserted the previous lines. I had no luck
2870 with detecting EOM with FSF, so we go now to EOM.
2871 Joerg Weule */
2872 } else
2873 fileno = (-1);
2874 cmd[0] = SPACE;
2875 cmd[1] = 3;
b30d8bca 2876 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2877 blkno = -1;
2878 at_sm = 0;
2879 break;
2880 case MTERASE:
2881 if (STp->write_prot)
2882 return (-EACCES);
2883 cmd[0] = ERASE;
2884 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2885 if (STp->immediate) {
2886 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2887 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2888 }
2889 else
2890 timeout = STp->long_timeout * 8;
2891
b30d8bca 2892 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2893 fileno = blkno = at_sm = 0;
2894 break;
2895 case MTSETBLK: /* Set block length */
2896 case MTSETDENSITY: /* Set tape density */
2897 case MTSETDRVBUFFER: /* Set drive buffering */
2898 case SET_DENS_AND_BLK: /* Set density and block size */
2899 chg_eof = 0;
2900 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2901 return (-EIO); /* Not allowed if data in buffer */
2902 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2903 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2904 STp->max_block > 0 &&
2905 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2906 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2907 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2908 return (-EINVAL);
2909 }
2910 cmd[0] = MODE_SELECT;
2911 if ((STp->use_pf & USE_PF))
2912 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2913 cmd[4] = datalen = 12;
2914 direction = DMA_TO_DEVICE;
2915
2916 memset((STp->buffer)->b_data, 0, 12);
2917 if (cmd_in == MTSETDRVBUFFER)
2918 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2919 else
2920 (STp->buffer)->b_data[2] =
2921 STp->drv_buffer << 4;
2922 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2923 if (cmd_in == MTSETDENSITY) {
2924 (STp->buffer)->b_data[4] = arg;
2925 STp->density_changed = 1; /* At least we tried ;-) */
2926 } else if (cmd_in == SET_DENS_AND_BLK)
2927 (STp->buffer)->b_data[4] = arg >> 24;
2928 else
2929 (STp->buffer)->b_data[4] = STp->density;
2930 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2931 ltmp = arg & MT_ST_BLKSIZE_MASK;
2932 if (cmd_in == MTSETBLK)
2933 STp->blksize_changed = 1; /* At least we tried ;-) */
2934 } else
2935 ltmp = STp->block_size;
2936 (STp->buffer)->b_data[9] = (ltmp >> 16);
2937 (STp->buffer)->b_data[10] = (ltmp >> 8);
2938 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2939 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2940 DEBC(
1da177e4 2941 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting block size to %d bytes.\n",
2944 (STp->buffer)->b_data[9] * 65536 +
2945 (STp->buffer)->b_data[10] * 256 +
2946 (STp->buffer)->b_data[11]);
1da177e4 2947 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2948 st_printk(ST_DEB_MSG, STp,
2949 "Setting density code to %x.\n",
2950 (STp->buffer)->b_data[4]);
1da177e4 2951 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2952 st_printk(ST_DEB_MSG, STp,
2953 "Setting drive buffer code to %d.\n",
2954 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2955 )
2956 break;
2957 default:
2958 return (-ENOSYS);
2959 }
2960
02ae2c0e
KM		 2961 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2962 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2963 if (!SRpnt)
2964 return (STp->buffer)->syscall_result;
2965
02ae2c0e 2966 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2967
2968 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2969 st_release_request(SRpnt);
1da177e4
LT		 2970 SRpnt = NULL;
2971 STps->drv_block = blkno;
2972 STps->drv_file = fileno;
2973 STps->at_sm = at_sm;
2974
2975 if (cmd_in == MTBSFM)
2976 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2977 else if (cmd_in == MTFSFM)
2978 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2979
2980 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2981 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2982 if (STp->block_size != 0) {
1da177e4
LT		 2983 (STp->buffer)->buffer_blocks =
2984 (STp->buffer)->buffer_size / STp->block_size;
2985 }
2986 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2987 if (cmd_in == SET_DENS_AND_BLK)
2988 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2989 } else if (cmd_in == MTSETDRVBUFFER)
2990 STp->drv_buffer = (arg & 7);
2991 else if (cmd_in == MTSETDENSITY)
2992 STp->density = arg;
2993
2994 if (cmd_in == MTEOM)
2995 STps->eof = ST_EOD;
2996 else if (cmd_in == MTFSF)
2997 STps->eof = ST_FM;
2998 else if (chg_eof)
2999 STps->eof = ST_NOEOF;
3000
3e51d3c9
KM		 3001 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3002 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 3003 } else { /* SCSI command was not completely successful. Don't return
3004 from this block without releasing the SCSI command block! */
3005 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3006
3007 if (cmdstatp->flags & SENSE_EOM) {
3008 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3009 cmd_in != MTBSR && cmd_in != MTBSS)
3010 STps->eof = ST_EOM_OK;
3011 STps->drv_block = 0;
3012 }
3013
3014 if (cmdstatp->remainder_valid)
3015 undone = (int)cmdstatp->uremainder64;
3016 else
3017 undone = 0;
3018
3e51d3c9 3019 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3020 cmdstatp->have_sense &&
91614c05
KM		 3021 (cmdstatp->flags & SENSE_EOM)) {
3022 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3023 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3024 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3025 STps->eof = ST_NOEOF;
3026 } else { /* Writing EOF(s) failed */
3027 if (fileno >= 0)
3028 fileno -= undone;
3029 if (undone < arg)
3030 STps->eof = ST_NOEOF;
3031 }
1da177e4 3032 STps->drv_file = fileno;
1da177e4
LT		 3033 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3034 if (fileno >= 0)
3035 STps->drv_file = fileno - undone;
3036 else
3037 STps->drv_file = fileno;
3038 STps->drv_block = -1;
3039 STps->eof = ST_NOEOF;
3040 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3041 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3042 undone = (-undone);
3043 if (STps->drv_file >= 0)
3044 STps->drv_file = fileno + undone;
3045 STps->drv_block = 0;
3046 STps->eof = ST_NOEOF;
3047 } else if (cmd_in == MTFSR) {
3048 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3049 if (STps->drv_file >= 0)
3050 STps->drv_file++;
3051 STps->drv_block = 0;
3052 STps->eof = ST_FM;
3053 } else {
3054 if (blkno >= undone)
3055 STps->drv_block = blkno - undone;
3056 else
3057 STps->drv_block = (-1);
3058 STps->eof = ST_NOEOF;
3059 }
3060 } else if (cmd_in == MTBSR) {
3061 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3062 STps->drv_file--;
3063 STps->drv_block = (-1);
3064 } else {
3065 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3066 undone = (-undone);
3067 if (STps->drv_block >= 0)
3068 STps->drv_block = blkno + undone;
3069 }
3070 STps->eof = ST_NOEOF;
3071 } else if (cmd_in == MTEOM) {
3072 STps->drv_file = (-1);
3073 STps->drv_block = (-1);
3074 STps->eof = ST_EOD;
3075 } else if (cmd_in == MTSETBLK ||
3076 cmd_in == MTSETDENSITY ||
3077 cmd_in == MTSETDRVBUFFER ||
3078 cmd_in == SET_DENS_AND_BLK) {
3079 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3080 !(STp->use_pf & PF_TESTED)) {
3081 /* Try the other possible state of Page Format if not
3082 already tried */
1da2019f 3083 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3084 st_release_request(SRpnt);
1da177e4
LT		 3085 SRpnt = NULL;
3086 return st_int_ioctl(STp, cmd_in, arg);
3087 }
3088 } else if (chg_eof)
3089 STps->eof = ST_NOEOF;
3090
3091 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3092 STps->eof = ST_EOD;
3093
8b05b773 3094 st_release_request(SRpnt);
1da177e4
LT		 3095 SRpnt = NULL;
3096 }
3097
3098 return ioctl_result;
3099}
3100\f
3101
3102/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3103 structure. */
3104
3105static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3106 int logical)
3107{
3108 int result;
3109 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3110 struct st_request *SRpnt;
1da177e4
LT		 3111
3112 if (STp->ready != ST_READY)
3113 return (-EIO);
3114
3115 memset(scmd, 0, MAX_COMMAND_SIZE);
3116 if ((STp->device)->scsi_level < SCSI_2) {
3117 scmd[0] = QFA_REQUEST_BLOCK;
3118 scmd[4] = 3;
3119 } else {
3120 scmd[0] = READ_POSITION;
3121 if (!logical && !STp->scsi2_logical)
3122 scmd[1] = 1;
3123 }
02ae2c0e
KM		 3124 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3125 STp->device->request_queue->rq_timeout,
3126 MAX_READY_RETRIES, 1);
1da177e4 3127 if (!SRpnt)
02ae2c0e 3128 return (STp->buffer)->syscall_result;
1da177e4
LT		 3129
3130 if ((STp->buffer)->syscall_result != 0 ||
3131 (STp->device->scsi_level >= SCSI_2 &&
3132 ((STp->buffer)->b_data[0] & 4) != 0)) {
3133 *block = *partition = 0;
b30d8bca 3134 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3135 result = (-EIO);
3136 } else {
3137 result = 0;
3138 if ((STp->device)->scsi_level < SCSI_2) {
3139 *block = ((STp->buffer)->b_data[0] << 16)
3140 + ((STp->buffer)->b_data[1] << 8)
3141 + (STp->buffer)->b_data[2];
3142 *partition = 0;
3143 } else {
3144 *block = ((STp->buffer)->b_data[4] << 24)
3145 + ((STp->buffer)->b_data[5] << 16)
3146 + ((STp->buffer)->b_data[6] << 8)
3147 + (STp->buffer)->b_data[7];
3148 *partition = (STp->buffer)->b_data[1];
3149 if (((STp->buffer)->b_data[0] & 0x80) &&
3150 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3151 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3152 }
b30d8bca
HR		 3153 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3154 *block, *partition);
1da177e4 3155 }
8b05b773 3156 st_release_request(SRpnt);
1da177e4
LT		 3157 SRpnt = NULL;
3158
3159 return result;
3160}
3161
3162
3163/* Set the tape block and partition. Negative partition means that only the
3164 block should be set in vendor specific way. */
3165static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3166 int logical)
3167{
3168 struct st_partstat *STps;
3169 int result, p;
3170 unsigned int blk;
3171 int timeout;
3172 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3173 struct st_request *SRpnt;
1da177e4
LT		 3174
3175 if (STp->ready != ST_READY)
3176 return (-EIO);
3177 timeout = STp->long_timeout;
3178 STps = &(STp->ps[STp->partition]);
3179
b30d8bca
HR		 3180 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3181 block, partition);
1da177e4
LT		 3182 DEB(if (partition < 0)
3183 return (-EIO); )
3184
3185 /* Update the location at the partition we are leaving */
3186 if ((!STp->can_partitions && partition != 0) ||
3187 partition >= ST_NBR_PARTITIONS)
3188 return (-EINVAL);
3189 if (partition != STp->partition) {
3190 if (get_location(STp, &blk, &p, 1))
3191 STps->last_block_valid = 0;
3192 else {
3193 STps->last_block_valid = 1;
3194 STps->last_block_visited = blk;
b30d8bca
HR		 3195 DEBC_printk(STp, "Visited block %d for "
3196 "partition %d saved.\n",
3197 blk, STp->partition);
1da177e4
LT		 3198 }
3199 }
3200
3201 memset(scmd, 0, MAX_COMMAND_SIZE);
3202 if ((STp->device)->scsi_level < SCSI_2) {
3203 scmd[0] = QFA_SEEK_BLOCK;
3204 scmd[2] = (block >> 16);
3205 scmd[3] = (block >> 8);
3206 scmd[4] = block;
3207 scmd[5] = 0;
3208 } else {
3209 scmd[0] = SEEK_10;
3210 scmd[3] = (block >> 24);
3211 scmd[4] = (block >> 16);
3212 scmd[5] = (block >> 8);
3213 scmd[6] = block;
3214 if (!logical && !STp->scsi2_logical)
3215 scmd[1] = 4;
3216 if (STp->partition != partition) {
3217 scmd[1] |= 2;
3218 scmd[8] = partition;
b30d8bca
HR		 3219 DEBC_printk(STp, "Trying to change partition "
3220 "from %d to %d\n", STp->partition,
3221 partition);
1da177e4
LT		 3222 }
3223 }
3224 if (STp->immediate) {
3225 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3226 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3227 }
3228
02ae2c0e
KM		 3229 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3230 timeout, MAX_READY_RETRIES, 1);
1da177e4 3231 if (!SRpnt)
02ae2c0e 3232 return (STp->buffer)->syscall_result;
1da177e4
LT		 3233
3234 STps->drv_block = STps->drv_file = (-1);
3235 STps->eof = ST_NOEOF;
3236 if ((STp->buffer)->syscall_result != 0) {
3237 result = (-EIO);
3238 if (STp->can_partitions &&
3239 (STp->device)->scsi_level >= SCSI_2 &&
3240 (p = find_partition(STp)) >= 0)
3241 STp->partition = p;
3242 } else {
3243 if (STp->can_partitions) {
3244 STp->partition = partition;
3245 STps = &(STp->ps[partition]);
3246 if (!STps->last_block_valid ||
3247 STps->last_block_visited != block) {
3248 STps->at_sm = 0;
3249 STps->rw = ST_IDLE;
3250 }
3251 } else
3252 STps->at_sm = 0;
3253 if (block == 0)
3254 STps->drv_block = STps->drv_file = 0;
3255 result = 0;
3256 }
02ae2c0e 3257
8b05b773 3258 st_release_request(SRpnt);
1da177e4
LT		 3259 SRpnt = NULL;
3260
3261 return result;
3262}
3263
3264
3265/* Find the current partition number for the drive status. Called from open and
3266 returns either partition number of negative error code. */
3267static int find_partition(struct scsi_tape *STp)
3268{
3269 int i, partition;
3270 unsigned int block;
3271
3272 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3273 return i;
3274 if (partition >= ST_NBR_PARTITIONS)
3275 return (-EIO);
3276 return partition;
3277}
3278
3279
3280/* Change the partition if necessary */
3281static int switch_partition(struct scsi_tape *STp)
3282{
3283 struct st_partstat *STps;
3284
3285 if (STp->partition == STp->new_partition)
3286 return 0;
3287 STps = &(STp->ps[STp->new_partition]);
3288 if (!STps->last_block_valid)
3289 STps->last_block_visited = 0;
3290 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3291}
3292\f
3293/* Functions for reading and writing the medium partition mode page. */
3294
3295#define PART_PAGE 0x11
3296#define PART_PAGE_FIXED_LENGTH 8
3297
3298#define PP_OFF_MAX_ADD_PARTS 2
3299#define PP_OFF_NBR_ADD_PARTS 3
3300#define PP_OFF_FLAGS 4
3301#define PP_OFF_PART_UNITS 6
3302#define PP_OFF_RESERVED 7
3303
3304#define PP_BIT_IDP 0x20
8038e645 3305#define PP_BIT_FDP 0x80
1da177e4 3306#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3307#define PP_MSK_PSUM_UNITS 0x18
3308#define PP_MSK_POFM 0x04
1da177e4
LT		 3309
3310/* Get the number of partitions on the tape. As a side effect reads the
3311 mode page into the tape buffer. */
3312static int nbr_partitions(struct scsi_tape *STp)
3313{
3314 int result;
1da177e4
LT		 3315
3316 if (STp->ready != ST_READY)
3317 return (-EIO);
3318
3319 result = read_mode_page(STp, PART_PAGE, 1);
3320
3321 if (result) {
b30d8bca 3322 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3323 result = (-EIO);
3324 } else {
3325 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3326 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3327 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3328 }
3329
3330 return result;
3331}
3332
3333
8038e645
KM		 3334static int format_medium(struct scsi_tape *STp, int format)
3335{
3336 int result = 0;
3337 int timeout = STp->long_timeout;
3338 unsigned char scmd[MAX_COMMAND_SIZE];
3339 struct st_request *SRpnt;
3340
3341 memset(scmd, 0, MAX_COMMAND_SIZE);
3342 scmd[0] = FORMAT_UNIT;
3343 scmd[2] = format;
3344 if (STp->immediate) {
3345 scmd[1] |= 1; /* Don't wait for completion */
3346 timeout = STp->device->request_queue->rq_timeout;
3347 }
3348 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3349 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3350 timeout, MAX_RETRIES, 1);
3351 if (!SRpnt)
3352 result = STp->buffer->syscall_result;
3353 return result;
3354}
3355
3356
1da177e4
LT		 3357/* Partition the tape into two partitions if size > 0 or one partition if
3358 size == 0.
3359
3360 The block descriptors are read and written because Sony SDT-7000 does not
3361 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3362
3363 My HP C1533A drive returns only one partition size field. This is used to
3364 set the size of partition 1. There is no size field for the default partition.
3365 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3366 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3367 The following algorithm is used to accommodate both drives: if the number of
3368 partition size fields is greater than the maximum number of additional partitions
3369 in the mode page, the second field is used. Otherwise the first field is used.
3370
3371 For Seagate DDS drives the page length must be 8 when no partitions is defined
3372 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3373 is acceptable also to some other old drives and enforced if the first partition
3374 size field is used for the first additional partition size.
8038e645
KM		 3375
3376 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3377 */
3378static int partition_tape(struct scsi_tape *STp, int size)
3379{
1da177e4 3380 int result;
8038e645
KM		 3381 int target_partition;
3382 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3383 int pgo, psd_cnt, psdo;
8038e645 3384 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3385 unsigned char *bp;
3386
3387 result = read_mode_page(STp, PART_PAGE, 0);
3388 if (result) {
b30d8bca 3389 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3390 return result;
3391 }
8038e645
KM		 3392 target_partition = 1;
3393 if (size < 0) {
3394 target_partition = 0;
3395 size = -size;
3396 }
3397
1da177e4
LT		 3398 /* The mode page is in the buffer. Let's modify it and write it. */
3399 bp = (STp->buffer)->b_data;
3400 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3401 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3402 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3403
3404 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3405
3406 if (scsi3) {
3407 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3408 if (needs_format && size == 0) {
3409 /* No need to write the mode page when clearing
3410 * partitioning
3411 */
3412 DEBC_printk(STp, "Formatting tape with one partition.\n");
3413 result = format_medium(STp, 0);
3414 goto out;
3415 }
3416 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3417 psd_cnt = 2;
3418 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3419 /* Use units scaling for large partitions if the device
3420 * suggests it and no precision lost. Required for IBM
3421 * TS1140/50 drives that don't support MB units.
3422 */
3423 if (size >= 1000 && (size % 1000) == 0) {
3424 size /= 1000;
3425 psum = PP_MSK_PSUM_UNITS;
3426 units = 9; /* GB */
3427 }
3428 }
3429 /* Try it anyway if too large to specify in MB */
3430 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3431 size /= 1000;
3432 psum = PP_MSK_PSUM_UNITS;
3433 units = 9; /* GB */
3434 }
3435 }
3436
3437 if (size >= 65535 || /* Does not fit into two bytes */
3438 (target_partition == 0 && psd_cnt < 2)) {
3439 result = -EINVAL;
3440 goto out;
3441 }
3442
1da177e4 3443 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3444 /* The second condition is for HP DDS which use only one partition size
3445 * descriptor
3446 */
3447 if (target_partition > 0 &&
3448 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3449 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3450 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3451 psdo += 2;
3452 }
3453 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3454
b30d8bca 3455 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3456 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3458
8038e645 3459 if (size == 0) {
1da177e4
LT		 3460 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3461 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3462 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3463 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3464 } else {
3465 bp[psdo] = (size >> 8) & 0xff;
3466 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3467 if (target_partition == 0)
3468 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3469 bp[pgo + 3] = 1;
3470 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3471 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3472 DEBC_printk(STp,
3473 "Formatting tape with two partitions (%i = %d MB).\n",
3474 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3475 }
3476 bp[pgo + PP_OFF_PART_UNITS] = 0;
3477 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3478 if (size != 1 || units != 0) {
3479 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3480 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3481 bp[pgo + PP_OFF_PART_UNITS] = units;
3482 } else
3483 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3484 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3485 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3486
3487 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3488
3489 if (!result && needs_format)
3490 result = format_medium(STp, 1);
3491
1da177e4 3492 if (result) {
b30d8bca 3493 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3494 result = (-EIO);
3495 }
3496
8038e645 3497out:
1da177e4
LT		 3498 return result;
3499}
3500\f
3501
3502
3503/* The ioctl command */
fd66c1b4 3504static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 3505{
3506 int i, cmd_nr, cmd_type, bt;
3507 int retval = 0;
3508 unsigned int blk;
3509 struct scsi_tape *STp = file->private_data;
3510 struct st_modedef *STm;
3511 struct st_partstat *STps;
1da177e4
LT		 3512 void __user *p = (void __user *)arg;
3513
28f85009 3514 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3515 return -ERESTARTSYS;
3516
b30d8bca 3517 DEB(
1da177e4 3518 if (debugging && !STp->in_use) {
b30d8bca 3519 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3520 retval = (-EIO);
3521 goto out;
3522 } ) /* end DEB */
3523
3524 STm = &(STp->modes[STp->current_mode]);
3525 STps = &(STp->ps[STp->partition]);
3526
3527 /*
3528 * If we are in the middle of error recovery, don't let anyone
3529 * else try and use this device. Also, if error recovery fails, it
3530 * may try and take the device offline, in which case all further
3531 * access to the device is prohibited.
3532 */
906d15fb
CH		 3533 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3534 file->f_flags & O_NDELAY);
3535 if (retval)
1da177e4 3536 goto out;
1da177e4
LT		 3537
3538 cmd_type = _IOC_TYPE(cmd_in);
3539 cmd_nr = _IOC_NR(cmd_in);
3540
3541 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3542 struct mtop mtc;
3543
3544 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3545 retval = (-EINVAL);
3546 goto out;
3547 }
3548
3549 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3550 if (i) {
3551 retval = (-EFAULT);
3552 goto out;
3553 }
3554
3555 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3556 st_printk(KERN_WARNING, STp,
3557 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3558 retval = (-EPERM);
3559 goto out;
3560 }
3561 if (!STm->defined &&
3562 (mtc.mt_op != MTSETDRVBUFFER &&
3563 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3564 retval = (-ENXIO);
3565 goto out;
3566 }
3567
3568 if (!STp->pos_unknown) {
3569
3570 if (STps->eof == ST_FM_HIT) {
3571 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3572 mtc.mt_op == MTEOM) {
3573 mtc.mt_count -= 1;
3574 if (STps->drv_file >= 0)
3575 STps->drv_file += 1;
3576 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3577 mtc.mt_count += 1;
3578 if (STps->drv_file >= 0)
3579 STps->drv_file += 1;
3580 }
3581 }
3582
3583 if (mtc.mt_op == MTSEEK) {
3584 /* Old position must be restored if partition will be
3585 changed */
3586 i = !STp->can_partitions ||
3587 (STp->new_partition != STp->partition);
3588 } else {
3589 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3590 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3591 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3592 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3593 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3594 mtc.mt_op == MTCOMPRESSION;
3595 }
3596 i = flush_buffer(STp, i);
3597 if (i < 0) {
3598 retval = i;
3599 goto out;
3600 }
3601 if (STps->rw == ST_WRITING &&
3602 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3603 mtc.mt_op == MTSEEK ||
3604 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3605 i = st_int_ioctl(STp, MTWEOF, 1);
3606 if (i < 0) {
3607 retval = i;
3608 goto out;
3609 }
3610 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3611 mtc.mt_count++;
3612 STps->rw = ST_IDLE;
3613 }
3614
3615 } else {
3616 /*
3617 * If there was a bus reset, block further access
3618 * to this device. If the user wants to rewind the tape,
3619 * then reset the flag and allow access again.
3620 */
3621 if (mtc.mt_op != MTREW &&
3622 mtc.mt_op != MTOFFL &&
3623 mtc.mt_op != MTRETEN &&
3624 mtc.mt_op != MTERASE &&
3625 mtc.mt_op != MTSEEK &&
3626 mtc.mt_op != MTEOM) {
3627 retval = (-EIO);
3628 goto out;
3629 }
3630 reset_state(STp);
3631 /* remove this when the midlevel properly clears was_reset */
3632 STp->device->was_reset = 0;
3633 }
3634
3635 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3636 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3637 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3638 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3639
3640 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3641 do_door_lock(STp, 0); /* Ignore result! */
3642
3643 if (mtc.mt_op == MTSETDRVBUFFER &&
3644 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3645 retval = st_set_options(STp, mtc.mt_count);
3646 goto out;
3647 }
3648
3649 if (mtc.mt_op == MTSETPART) {
3650 if (!STp->can_partitions ||
3651 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3652 retval = (-EINVAL);
3653 goto out;
3654 }
3655 if (mtc.mt_count >= STp->nbr_partitions &&
3656 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3657 retval = (-EIO);
3658 goto out;
3659 }
3660 if (mtc.mt_count >= STp->nbr_partitions) {
3661 retval = (-EINVAL);
3662 goto out;
3663 }
3664 STp->new_partition = mtc.mt_count;
3665 retval = 0;
3666 goto out;
3667 }
3668
3669 if (mtc.mt_op == MTMKPART) {
3670 if (!STp->can_partitions) {
3671 retval = (-EINVAL);
3672 goto out;
3673 }
8038e645
KM		 3674 i = do_load_unload(STp, file, 1);
3675 if (i < 0) {
3676 retval = i;
3677 goto out;
3678 }
3679 i = partition_tape(STp, mtc.mt_count);
3680 if (i < 0) {
1da177e4
LT		 3681 retval = i;
3682 goto out;
3683 }
3684 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3685 STp->ps[i].rw = ST_IDLE;
3686 STp->ps[i].at_sm = 0;
3687 STp->ps[i].last_block_valid = 0;
3688 }
3689 STp->partition = STp->new_partition = 0;
8038e645 3690 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3691 STps->drv_block = STps->drv_file = 0;
3692 retval = 0;
3693 goto out;
3694 }
3695
3696 if (mtc.mt_op == MTSEEK) {
3697 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3698 if (!STp->can_partitions)
3699 STp->ps[0].rw = ST_IDLE;
3700 retval = i;
3701 goto out;
3702 }
3703
3704 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3705 retval = do_load_unload(STp, file, 0);
3706 goto out;
3707 }
3708
3709 if (mtc.mt_op == MTLOAD) {
3710 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3711 goto out;
3712 }
3713
3714 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3715 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3716 goto out;
3717 }
3718
3719 if (STp->can_partitions && STp->ready == ST_READY &&
3720 (i = switch_partition(STp)) < 0) {
3721 retval = i;
3722 goto out;
3723 }
3724
3725 if (mtc.mt_op == MTCOMPRESSION)
3726 retval = st_compression(STp, (mtc.mt_count & 1));
3727 else
3728 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3729 goto out;
3730 }
3731 if (!STm->defined) {
3732 retval = (-ENXIO);
3733 goto out;
3734 }
3735
3736 if ((i = flush_buffer(STp, 0)) < 0) {
3737 retval = i;
3738 goto out;
3739 }
3740 if (STp->can_partitions &&
3741 (i = switch_partition(STp)) < 0) {
3742 retval = i;
3743 goto out;
3744 }
3745
3746 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3747 struct mtget mt_status;
3748
3749 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3750 retval = (-EINVAL);
3751 goto out;
3752 }
3753
3754 mt_status.mt_type = STp->tape_type;
3755 mt_status.mt_dsreg =
3756 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3757 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3758 mt_status.mt_blkno = STps->drv_block;
3759 mt_status.mt_fileno = STps->drv_file;
3760 if (STp->block_size != 0) {
3761 if (STps->rw == ST_WRITING)
3762 mt_status.mt_blkno +=
3763 (STp->buffer)->buffer_bytes / STp->block_size;
3764 else if (STps->rw == ST_READING)
3765 mt_status.mt_blkno -=
3766 ((STp->buffer)->buffer_bytes +
3767 STp->block_size - 1) / STp->block_size;
3768 }
3769
3770 mt_status.mt_gstat = 0;
3771 if (STp->drv_write_prot)
3772 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3773 if (mt_status.mt_blkno == 0) {
3774 if (mt_status.mt_fileno == 0)
3775 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3776 else
3777 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3778 }
3779 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3780 mt_status.mt_resid = STp->partition;
3781 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3782 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3783 else if (STps->eof >= ST_EOM_OK)
3784 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3785 if (STp->density == 1)
3786 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3787 else if (STp->density == 2)
3788 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3789 else if (STp->density == 3)
3790 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3791 if (STp->ready == ST_READY)
3792 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3793 if (STp->ready == ST_NO_TAPE)
3794 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3795 if (STps->at_sm)
3796 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3797 if (STm->do_async_writes ||
3798 (STm->do_buffer_writes && STp->block_size != 0) ||
3799 STp->drv_buffer != 0)
3800 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3801 if (STp->cleaning_req)
3802 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3803
3804 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3805 if (i) {
3806 retval = (-EFAULT);
3807 goto out;
3808 }
3809
3810 STp->recover_reg = 0; /* Clear after read */
3811 retval = 0;
3812 goto out;
3813 } /* End of MTIOCGET */
3814 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3815 struct mtpos mt_pos;
3816 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3817 retval = (-EINVAL);
3818 goto out;
3819 }
3820 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3821 retval = i;
3822 goto out;
3823 }
3824 mt_pos.mt_blkno = blk;
3825 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3826 if (i)
3827 retval = (-EFAULT);
3828 goto out;
3829 }
28f85009 3830 mutex_unlock(&STp->lock);
1da177e4
LT		 3831 switch (cmd_in) {
3832 case SCSI_IOCTL_GET_IDLUN:
3833 case SCSI_IOCTL_GET_BUS_NUMBER:
3834 break;
3835 default:
16c4b3e2
KM		 3836 if ((cmd_in == SG_IO ||
3837 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3838 cmd_in == CDROM_SEND_PACKET) &&
3839 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3840 i = -EPERM;
3841 else
74f3c8af
AV		 3842 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3843 file->f_mode, cmd_in, p);
1da177e4
LT		 3844 if (i != -ENOTTY)
3845 return i;
3846 break;
3847 }
16c4b3e2
KM		 3848 retval = scsi_ioctl(STp->device, cmd_in, p);
3849 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3850 STp->rew_at_close = 0;
3851 STp->ready = ST_NO_TAPE;
3852 }
3853 return retval;
1da177e4
LT		 3854
3855 out:
28f85009 3856 mutex_unlock(&STp->lock);
1da177e4
LT		 3857 return retval;
3858}
3859
3860#ifdef CONFIG_COMPAT
3861static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3862{
3863 struct scsi_tape *STp = file->private_data;
3864 struct scsi_device *sdev = STp->device;
3865 int ret = -ENOIOCTLCMD;
3866 if (sdev->host->hostt->compat_ioctl) {
3867
3868 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3869
3870 }
3871 return ret;
3872}
3873#endif
3874
3875\f
3876
3877/* Try to allocate a new tape buffer. Calling function must not hold
3878 dev_arr_lock. */
f409d6cc 3879static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
1da177e4 3880{
1da177e4
LT		 3881 struct st_buffer *tb;
3882
4011f076 3883 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
1da177e4
LT		 3884 if (!tb) {
3885 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3886 return NULL;
3887 }
1ac63cf5 3888 tb->frp_segs = 0;
1da177e4 3889 tb->use_sg = max_sg;
1da177e4 3890 tb->dma = need_dma;
f409d6cc 3891 tb->buffer_size = 0;
1da177e4 3892
6396bb22 3893 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
4011f076 3894 GFP_KERNEL);
d0e1ae31
FT		 3895 if (!tb->reserved_pages) {
3896 kfree(tb);
3897 return NULL;
3898 }
3899
1da177e4
LT		 3900 return tb;
3901}
3902
3903
3904/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3905#define ST_MAX_ORDER 6
3906
1da177e4
LT		 3907static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3908{
769989a4 3909 int segs, max_segs, b_size, order, got;
c53033f6 3910 gfp_t priority;
1da177e4
LT		 3911
3912 if (new_size <= STbuffer->buffer_size)
3913 return 1;
3914
3915 if (STbuffer->buffer_size <= PAGE_SIZE)
3916 normalize_buffer(STbuffer); /* Avoid extra segment */
3917
3918 max_segs = STbuffer->use_sg;
1da177e4
LT		 3919
3920 priority = GFP_KERNEL | __GFP_NOWARN;
3921 if (need_dma)
3922 priority |= GFP_DMA;
9c905966 3923
08c95832
FT		 3924 if (STbuffer->cleared)
3925 priority |= __GFP_ZERO;
3926
9c905966 3927 if (STbuffer->frp_segs) {
c982c368 3928 order = STbuffer->reserved_page_order;
08c95832 3929 b_size = PAGE_SIZE << order;
9c905966
FT		 3930 } else {
3931 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3932 order < ST_MAX_ORDER &&
3933 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3934 order++, b_size *= 2)
9c905966 3935 ; /* empty */
373daacf 3936 STbuffer->reserved_page_order = order;
9c905966 3937 }
8f78fc5e
KM		 3938 if (max_segs * (PAGE_SIZE << order) < new_size) {
3939 if (order == ST_MAX_ORDER)
3940 return 0;
3941 normalize_buffer(STbuffer);
3942 return enlarge_buffer(STbuffer, new_size, need_dma);
3943 }
1da177e4
LT		 3944
3945 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3946 segs < max_segs && got < new_size;) {
08c95832
FT		 3947 struct page *page;
3948
3949 page = alloc_pages(priority, order);
3950 if (!page) {
1da177e4
LT		 3951 DEB(STbuffer->buffer_size = got);
3952 normalize_buffer(STbuffer);
3953 return 0;
3954 }
08c95832 3955
1da177e4
LT		 3956 STbuffer->frp_segs += 1;
3957 got += b_size;
3958 STbuffer->buffer_size = got;
08c95832 3959 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3960 segs++;
3961 }
08c95832 3962 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3963
3964 return 1;
3965}
3966
3967
40f6b36c
KM		 3968/* Make sure that no data from previous user is in the internal buffer */
3969static void clear_buffer(struct st_buffer * st_bp)
3970{
3971 int i;
3972
3973 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3974 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3975 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3976 st_bp->cleared = 1;
3977}
3978
3979
1da177e4
LT		 3980/* Release the extra buffer */
3981static void normalize_buffer(struct st_buffer * STbuffer)
3982{
c982c368 3983 int i, order = STbuffer->reserved_page_order;
1da177e4 3984
1ac63cf5 3985 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3986 __free_pages(STbuffer->reserved_pages[i], order);
3987 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3988 }
1ac63cf5 3989 STbuffer->frp_segs = 0;
8b05b773 3990 STbuffer->sg_segs = 0;
c982c368 3991 STbuffer->reserved_page_order = 0;
d0e1ae31 3992 STbuffer->map_data.offset = 0;
1da177e4
LT		 3993}
3994
3995
3996/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3997 negative error code. */
3998static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3999{
4000 int i, cnt, res, offset;
c982c368 4001 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4002
4003 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 4004 i < st_bp->frp_segs && offset >= length; i++)
4005 offset -= length;
1da177e4
LT		 4006 if (i == st_bp->frp_segs) { /* Should never happen */
4007 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4008 return (-EIO);
4009 }
4010 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4011 struct page *page = st_bp->reserved_pages[i];
4012 cnt = length - offset < do_count ? length - offset : do_count;
4013 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4014 if (res)
4015 return (-EFAULT);
4016 do_count -= cnt;
4017 st_bp->buffer_bytes += cnt;
4018 ubp += cnt;
4019 offset = 0;
4020 }
4021 if (do_count) /* Should never happen */
4022 return (-EIO);
4023
4024 return 0;
4025}
4026
4027
4028/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4029 negative error code. */
4030static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4031{
4032 int i, cnt, res, offset;
c982c368 4033 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4034
4035 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4036 i < st_bp->frp_segs && offset >= length; i++)
4037 offset -= length;
1da177e4
LT		 4038 if (i == st_bp->frp_segs) { /* Should never happen */
4039 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4040 return (-EIO);
4041 }
4042 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4043 struct page *page = st_bp->reserved_pages[i];
4044 cnt = length - offset < do_count ? length - offset : do_count;
4045 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4046 if (res)
4047 return (-EFAULT);
4048 do_count -= cnt;
4049 st_bp->buffer_bytes -= cnt;
4050 st_bp->read_pointer += cnt;
4051 ubp += cnt;
4052 offset = 0;
4053 }
4054 if (do_count) /* Should never happen */
4055 return (-EIO);
4056
4057 return 0;
4058}
4059
4060
4061/* Move data towards start of buffer */
4062static void move_buffer_data(struct st_buffer * st_bp, int offset)
4063{
4064 int src_seg, dst_seg, src_offset = 0, dst_offset;
4065 int count, total;
c982c368 4066 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4067
4068 if (offset == 0)
4069 return;
4070
4071 total=st_bp->buffer_bytes - offset;
4072 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4073 src_offset = offset;
08c95832 4074 if (src_offset < length)
1da177e4 4075 break;
08c95832 4076 offset -= length;
1da177e4
LT		 4077 }
4078
4079 st_bp->buffer_bytes = st_bp->read_pointer = total;
4080 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4081 struct page *dpage = st_bp->reserved_pages[dst_seg];
4082 struct page *spage = st_bp->reserved_pages[src_seg];
4083
4084 count = min(length - dst_offset, length - src_offset);
4085 memmove(page_address(dpage) + dst_offset,
4086 page_address(spage) + src_offset, count);
1da177e4 4087 src_offset += count;
08c95832 4088 if (src_offset >= length) {
1da177e4
LT		 4089 src_seg++;
4090 src_offset = 0;
4091 }
4092 dst_offset += count;
08c95832 4093 if (dst_offset >= length) {
1da177e4
LT		 4094 dst_seg++;
4095 dst_offset = 0;
4096 }
4097 total -= count;
4098 }
4099}
4100
1da177e4
LT		 4101/* Validate the options from command line or module parameters */
4102static void validate_options(void)
4103{
4104 if (buffer_kbs > 0)
4105 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4106 if (max_sg_segs >= ST_FIRST_SG)
4107 st_max_sg_segs = max_sg_segs;
4108}
4109
4110#ifndef MODULE
4111/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4112 */
4113static int __init st_setup(char *str)
4114{
4115 int i, len, ints[5];
4116 char *stp;
4117
4118 stp = get_options(str, ARRAY_SIZE(ints), ints);
4119
4120 if (ints[0] > 0) {
4121 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4122 if (parms[i].val)
4123 *parms[i].val = ints[i + 1];
4124 } else {
4125 while (stp != NULL) {
4126 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4127 len = strlen(parms[i].name);
4128 if (!strncmp(stp, parms[i].name, len) &&
4129 (*(stp + len) == ':' || *(stp + len) == '=')) {
4130 if (parms[i].val)
4131 *parms[i].val =
4132 simple_strtoul(stp + len + 1, NULL, 0);
4133 else
4134 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4135 parms[i].name);
4136 break;
4137 }
4138 }
6391a113 4139 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4140 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4141 stp);
4142 stp = strchr(stp, ',');
4143 if (stp)
4144 stp++;
4145 }
4146 }
4147
4148 validate_options();
4149
4150 return 1;
4151}
4152
4153__setup("st=", st_setup);
4154
4155#endif
4156
00977a59 4157static const struct file_operations st_fops =
1da177e4
LT		 4158{
4159 .owner = THIS_MODULE,
4160 .read = st_read,
4161 .write = st_write,
fd66c1b4 4162 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4163#ifdef CONFIG_COMPAT
4164 .compat_ioctl = st_compat_ioctl,
4165#endif
4166 .open = st_open,
4167 .flush = st_flush,
4168 .release = st_release,
b4d878e2 4169 .llseek = noop_llseek,
1da177e4
LT		 4170};
4171
26898afd
JM		 4172static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4173{
4174 int i, error;
4175 dev_t cdev_devno;
4176 struct cdev *cdev;
4177 struct device *dev;
4178 struct st_modedef *STm = &(tape->modes[mode]);
4179 char name[10];
4180 int dev_num = tape->index;
4181
4182 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4183
4184 cdev = cdev_alloc();
4185 if (!cdev) {
4186 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4187 error = -ENOMEM;
4188 goto out;
4189 }
4190 cdev->owner = THIS_MODULE;
4191 cdev->ops = &st_fops;
ab08ee14 4192 STm->cdevs[rew] = cdev;
26898afd
JM		 4193
4194 error = cdev_add(cdev, cdev_devno, 1);
4195 if (error) {
4196 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4197 rew ? "non" : "auto", mode);
4198 pr_err("st%d: Device not attached.\n", dev_num);
4199 goto out_free;
4200 }
26898afd
JM		 4201
4202 i = mode << (4 - ST_NBR_MODE_BITS);
4203 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4204 tape->disk->disk_name, st_formats[i]);
4205
4206 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4207 cdev_devno, &tape->modes[mode], "%s", name);
4208 if (IS_ERR(dev)) {
4209 pr_err("st%d: device_create failed\n", dev_num);
4210 error = PTR_ERR(dev);
4211 goto out_free;
4212 }
4213
4214 STm->devs[rew] = dev;
4215
4216 return 0;
4217out_free:
4218 cdev_del(STm->cdevs[rew]);
26898afd 4219out:
ab08ee14
ML		 4220 STm->cdevs[rew] = NULL;
4221 STm->devs[rew] = NULL;
26898afd
JM		 4222 return error;
4223}
4224
4225static int create_cdevs(struct scsi_tape *tape)
4226{
4227 int mode, error;
4228 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4229 error = create_one_cdev(tape, mode, 0);
4230 if (error)
4231 return error;
4232 error = create_one_cdev(tape, mode, 1);
4233 if (error)
4234 return error;
4235 }
4236
4237 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4238 &tape->modes[0].devs[0]->kobj, "tape");
4239}
4240
4241static void remove_cdevs(struct scsi_tape *tape)
4242{
4243 int mode, rew;
4244 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4245 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4246 struct st_modedef *STm = &(tape->modes[mode]);
4247 for (rew = 0; rew < 2; rew++) {
4248 if (STm->cdevs[rew])
4249 cdev_del(STm->cdevs[rew]);
4250 if (STm->devs[rew])
4251 device_unregister(STm->devs[rew]);
4252 }
4253 }
4254}
4255
1da177e4
LT		 4256static int st_probe(struct device *dev)
4257{
4258 struct scsi_device *SDp = to_scsi_device(dev);
4259 struct gendisk *disk = NULL;
1da177e4
LT		 4260 struct scsi_tape *tpnt = NULL;
4261 struct st_modedef *STm;
4262 struct st_partstat *STps;
4263 struct st_buffer *buffer;
b98c52b5 4264 int i, error;
1da177e4 4265 char *stp;
1da177e4
LT		 4266
4267 if (SDp->type != TYPE_TAPE)
4268 return -ENODEV;
4269 if ((stp = st_incompatible(SDp))) {
3bf743e7 4270 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
b30d8bca
HR		 4271 sdev_printk(KERN_INFO, SDp,
4272 "st: The suggested driver is %s.\n", stp);
1da177e4
LT		 4273 return -ENODEV;
4274 }
4275
6fe8c1db 4276 scsi_autopm_get_device(SDp);
8a78362c 4277 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4278 if (st_max_sg_segs < i)
4279 i = st_max_sg_segs;
f409d6cc 4280 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
1da177e4 4281 if (buffer == NULL) {
b30d8bca
HR		 4282 sdev_printk(KERN_ERR, SDp,
4283 "st: Can't allocate new tape buffer. "
4284 "Device not attached.\n");
1da177e4
LT		 4285 goto out;
4286 }
4287
4288 disk = alloc_disk(1);
4289 if (!disk) {
b30d8bca
HR		 4290 sdev_printk(KERN_ERR, SDp,
4291 "st: out of memory. Device not attached.\n");
1da177e4
LT		 4292 goto out_buffer_free;
4293 }
4294
1f618aac 4295 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
1da177e4 4296 if (tpnt == NULL) {
b30d8bca
HR		 4297 sdev_printk(KERN_ERR, SDp,
4298 "st: Can't allocate device descriptor.\n");
1da177e4
LT		 4299 goto out_put_disk;
4300 }
f03a5670 4301 kref_init(&tpnt->kref);
1da177e4 4302 tpnt->disk = disk;
1da177e4 4303 disk->private_data = &tpnt->driver;
2b5bebcc
JL		 4304 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4305 * take queue reference that release_disk() expects. */
180efde0 4306 if (!blk_get_queue(SDp->request_queue))
2b5bebcc 4307 goto out_put_disk;
180efde0 4308 disk->queue = SDp->request_queue;
1da177e4 4309 tpnt->driver = &st_template;
1da177e4
LT		 4310
4311 tpnt->device = SDp;
4312 if (SDp->scsi_level <= 2)
4313 tpnt->tape_type = MT_ISSCSI1;
4314 else
4315 tpnt->tape_type = MT_ISSCSI2;
4316
4317 tpnt->buffer = buffer;
f03a5670 4318 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4319
4320 tpnt->inited = 0;
4321 tpnt->dirty = 0;
4322 tpnt->in_use = 0;
4323 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4324 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4325 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4326 tpnt->density = 0;
4327 tpnt->do_auto_lock = ST_AUTO_LOCK;
4328 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4329 tpnt->can_partitions = 0;
4330 tpnt->two_fm = ST_TWO_FM;
4331 tpnt->fast_mteom = ST_FAST_MTEOM;
4332 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4333 tpnt->sili = ST_SILI;
1da177e4 4334 tpnt->immediate = ST_NOWAIT;
c743e44f 4335 tpnt->immediate_filemark = 0;
1da177e4
LT		 4336 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4337 tpnt->partition = 0;
4338 tpnt->new_partition = 0;
4339 tpnt->nbr_partitions = 0;
a02488ed 4340 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4341 tpnt->long_timeout = ST_LONG_TIMEOUT;
4342 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4343
1da177e4
LT		 4344 for (i = 0; i < ST_NBR_MODES; i++) {
4345 STm = &(tpnt->modes[i]);
4346 STm->defined = 0;
4347 STm->sysv = ST_SYSV;
4348 STm->defaults_for_writes = 0;
4349 STm->do_async_writes = ST_ASYNC_WRITES;
4350 STm->do_buffer_writes = ST_BUFFER_WRITES;
4351 STm->do_read_ahead = ST_READ_AHEAD;
4352 STm->default_compression = ST_DONT_TOUCH;
4353 STm->default_blksize = (-1); /* No forced size */
4354 STm->default_density = (-1); /* No forced density */
6c648d95 4355 STm->tape = tpnt;
1da177e4
LT		 4356 }
4357
4358 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4359 STps = &(tpnt->ps[i]);
4360 STps->rw = ST_IDLE;
4361 STps->eof = ST_NOEOF;
4362 STps->at_sm = 0;
4363 STps->last_block_valid = 0;
4364 STps->drv_block = (-1);
4365 STps->drv_file = (-1);
4366 }
4367
4368 tpnt->current_mode = 0;
4369 tpnt->modes[0].defined = 1;
4370
4371 tpnt->density_changed = tpnt->compression_changed =
4372 tpnt->blksize_changed = 0;
28f85009 4373 mutex_init(&tpnt->lock);
1da177e4 4374
b98c52b5 4375 idr_preload(GFP_KERNEL);
6c648d95 4376 spin_lock(&st_index_lock);
b98c52b5 4377 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4378 spin_unlock(&st_index_lock);
b98c52b5
TH		 4379 idr_preload_end();
4380 if (error < 0) {
6c648d95 4381 pr_warn("st: idr allocation failed: %d\n", error);
2b5bebcc 4382 goto out_put_queue;
6c648d95 4383 }
b98c52b5
TH		 4384 tpnt->index = error;
4385 sprintf(disk->disk_name, "st%d", tpnt->index);
05545c92
SS		 4386 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4387 if (tpnt->stats == NULL) {
4388 sdev_printk(KERN_ERR, SDp,
4389 "st: Can't allocate statistics.\n");
4390 goto out_idr_remove;
4391 }
6c648d95
JM		 4392
4393 dev_set_drvdata(dev, tpnt);
1da177e4 4394
1da177e4 4395
26898afd
JM		 4396 error = create_cdevs(tpnt);
4397 if (error)
4398 goto out_remove_devs;
46a243f7 4399 scsi_autopm_put_device(SDp);
1da177e4 4400
42252854 4401 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4402 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4403 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4404 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4405 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4406
4407 return 0;
4408
26898afd
JM		 4409out_remove_devs:
4410 remove_cdevs(tpnt);
05545c92
SS		 4411 kfree(tpnt->stats);
4412out_idr_remove:
6c648d95 4413 spin_lock(&st_index_lock);
b98c52b5 4414 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4415 spin_unlock(&st_index_lock);
2b5bebcc
JL		 4416out_put_queue:
4417 blk_put_queue(disk->queue);
1da177e4
LT		 4418out_put_disk:
4419 put_disk(disk);
c9475cb0 4420 kfree(tpnt);
1da177e4
LT		 4421out_buffer_free:
4422 kfree(buffer);
4423out:
6fe8c1db 4424 scsi_autopm_put_device(SDp);
1da177e4
LT		 4425 return -ENODEV;
4426};
4427
4428
4429static int st_remove(struct device *dev)
4430{
6c648d95 4431 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4432 int index = tpnt->index;
4433
4434 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4435 remove_cdevs(tpnt);
1da177e4 4436
6c648d95
JM		 4437 mutex_lock(&st_ref_mutex);
4438 kref_put(&tpnt->kref, scsi_tape_release);
4439 mutex_unlock(&st_ref_mutex);
4440 spin_lock(&st_index_lock);
4441 idr_remove(&st_index_idr, index);
4442 spin_unlock(&st_index_lock);
1da177e4
LT		 4443 return 0;
4444}
4445
f03a5670
KM		 4446/**
4447 * scsi_tape_release - Called to free the Scsi_Tape structure
4448 * @kref: pointer to embedded kref
4449 *
0b950672 4450 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4451 * called on last put, you should always use the scsi_tape_get()
4452 * scsi_tape_put() helpers which manipulate the semaphore directly
4453 * and never do a direct kref_put().
4454 **/
4455static void scsi_tape_release(struct kref *kref)
4456{
4457 struct scsi_tape *tpnt = to_scsi_tape(kref);
4458 struct gendisk *disk = tpnt->disk;
4459
4460 tpnt->device = NULL;
4461
4462 if (tpnt->buffer) {
f03a5670 4463 normalize_buffer(tpnt->buffer);
d0e1ae31 4464 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4465 kfree(tpnt->buffer);
4466 }
4467
4468 disk->private_data = NULL;
4469 put_disk(disk);
05545c92 4470 kfree(tpnt->stats);
f03a5670
KM		 4471 kfree(tpnt);
4472 return;
4473}
4474
af23782b
JM		 4475static struct class st_sysfs_class = {
4476 .name = "scsi_tape",
c69c6be5 4477 .dev_groups = st_dev_groups,
af23782b
JM		 4478};
4479
1da177e4
LT		 4480static int __init init_st(void)
4481{
13026a6b
JG		 4482 int err;
4483
1da177e4
LT		 4484 validate_options();
4485
13026a6b 4486 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4487 verstr, st_fixed_buffer_size, st_max_sg_segs);
4488
2bec708a
LO		 4489 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4490 if (debugging) {
4491 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4492 debugging);
4493 }
4494
af23782b
JM		 4495 err = class_register(&st_sysfs_class);
4496 if (err) {
4497 pr_err("Unable register sysfs class for SCSI tapes\n");
4498 return err;
1da177e4
LT		 4499 }
4500
13026a6b
JG		 4501 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4502 ST_MAX_TAPE_ENTRIES, "st");
4503 if (err) {
4504 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4505 SCSI_TAPE_MAJOR);
4506 goto err_class;
1da177e4
LT		 4507 }
4508
13026a6b
JG		 4509 err = scsi_register_driver(&st_template.gendrv);
4510 if (err)
4511 goto err_chrdev;
4512
13026a6b
JG		 4513 return 0;
4514
13026a6b
JG		 4515err_chrdev:
4516 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4517 ST_MAX_TAPE_ENTRIES);
4518err_class:
af23782b 4519 class_unregister(&st_sysfs_class);
13026a6b 4520 return err;
1da177e4
LT		 4521}
4522
4523static void __exit exit_st(void)
4524{
1da177e4
LT		 4525 scsi_unregister_driver(&st_template.gendrv);
4526 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4527 ST_MAX_TAPE_ENTRIES);
af23782b 4528 class_unregister(&st_sysfs_class);
2d3a5d21 4529 idr_destroy(&st_index_idr);
1da177e4
LT		 4530 printk(KERN_INFO "st: Unloaded.\n");
4531}
4532
4533module_init(init_st);
4534module_exit(exit_st);
4535
4536
4537/* The sysfs driver interface. Read-only at the moment */
10978e48 4538static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4539{
10978e48 4540 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4541}
10978e48 4542static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4543
10978e48 4544static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4545{
10978e48 4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4547}
10978e48 4548static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4549
10978e48 4550static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4551{
10978e48 4552 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4553}
10978e48 4554static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4555
10978e48 4556static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4557{
10978e48 4558 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4559}
10978e48 4560static DRIVER_ATTR_RO(version);
1da177e4 4561
d9b43a10
SS		 4562#if DEBUG
4563static ssize_t debug_flag_store(struct device_driver *ddp,
4564 const char *buf, size_t count)
4565{
4566/* We only care what the first byte of the data is the rest is unused.
4567 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4568 * other values have -EINVAL returned if they are passed in.
4569 */
4570 if (count > 0) {
4571 if (buf[0] == '0') {
4572 debugging = NO_DEBUG;
4573 return count;
4574 } else if (buf[0] == '1') {
4575 debugging = 1;
4576 return count;
4577 }
4578 }
4579 return -EINVAL;
4580}
4581
4582static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4583{
4584 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4585}
4586static DRIVER_ATTR_RW(debug_flag);
4587#endif
4588
442d7562
SS		 4589static struct attribute *st_drv_attrs[] = {
4590 &driver_attr_try_direct_io.attr,
4591 &driver_attr_fixed_buffer_size.attr,
4592 &driver_attr_max_sg_segs.attr,
4593 &driver_attr_version.attr,
d9b43a10
SS		 4594#if DEBUG
4595 &driver_attr_debug_flag.attr,
4596#endif
442d7562
SS		 4597 NULL,
4598};
4599ATTRIBUTE_GROUPS(st_drv);
1da177e4 4600
1da177e4 4601/* The sysfs simple class interface */
ee959b00 4602static ssize_t
af23782b 4603defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4604{
7d15d6a4 4605 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4606 ssize_t l = 0;
4607
4608 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4609 return l;
4610}
c69c6be5 4611static DEVICE_ATTR_RO(defined);
1da177e4 4612
ee959b00 4613static ssize_t
af23782b
JM		 4614default_blksize_show(struct device *dev, struct device_attribute *attr,
4615 char *buf)
1da177e4 4616{
7d15d6a4 4617 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4618 ssize_t l = 0;
4619
4620 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4621 return l;
4622}
c69c6be5 4623static DEVICE_ATTR_RO(default_blksize);
1da177e4 4624
ee959b00 4625static ssize_t
af23782b
JM		 4626default_density_show(struct device *dev, struct device_attribute *attr,
4627 char *buf)
1da177e4 4628{
7d15d6a4 4629 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4630 ssize_t l = 0;
4631 char *fmt;
4632
4633 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4634 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4635 return l;
4636}
c69c6be5 4637static DEVICE_ATTR_RO(default_density);
1da177e4 4638
ee959b00 4639static ssize_t
af23782b
JM		 4640default_compression_show(struct device *dev, struct device_attribute *attr,
4641 char *buf)
1da177e4 4642{
7d15d6a4 4643 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4644 ssize_t l = 0;
4645
4646 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4647 return l;
4648}
c69c6be5 4649static DEVICE_ATTR_RO(default_compression);
1da177e4 4650
ee959b00 4651static ssize_t
af23782b 4652options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4653{
7d15d6a4 4654 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4655 struct scsi_tape *STp = STm->tape;
4656 int options;
b174be02
KM		 4657 ssize_t l = 0;
4658
b174be02
KM		 4659 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4660 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4661 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4662 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4663 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4664 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4665 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4666 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4667 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4668 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4669 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4670 options |= STm->sysv ? MT_ST_SYSV : 0;
4671 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4672 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4673 options |= STp->sili ? MT_ST_SILI : 0;
4674
4675 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4676 return l;
4677}
c69c6be5
GKH		 4678static DEVICE_ATTR_RO(options);
4679
05545c92
SS		 4680/* Support for tape stats */
4681
4682/**
4683 * read_cnt_show - return read count - count of reads made from tape drive
4684 * @dev: struct device
4685 * @attr: attribute structure
4686 * @buf: buffer to return formatted data in
4687 */
4688static ssize_t read_cnt_show(struct device *dev,
4689 struct device_attribute *attr, char *buf)
4690{
4691 struct st_modedef *STm = dev_get_drvdata(dev);
4692
4693 return sprintf(buf, "%lld",
4694 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4695}
4696static DEVICE_ATTR_RO(read_cnt);
4697
4698/**
4699 * read_byte_cnt_show - return read byte count - tape drives
4700 * may use blocks less than 512 bytes this gives the raw byte count of
4701 * of data read from the tape drive.
4702 * @dev: struct device
4703 * @attr: attribute structure
4704 * @buf: buffer to return formatted data in
4705 */
4706static ssize_t read_byte_cnt_show(struct device *dev,
4707 struct device_attribute *attr, char *buf)
4708{
4709 struct st_modedef *STm = dev_get_drvdata(dev);
4710
4711 return sprintf(buf, "%lld",
4712 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4713}
4714static DEVICE_ATTR_RO(read_byte_cnt);
4715
4716/**
e2dca2a2 4717 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
05545c92
SS		 4718 * @dev: struct device
4719 * @attr: attribute structure
4720 * @buf: buffer to return formatted data in
4721 */
4722static ssize_t read_ns_show(struct device *dev,
4723 struct device_attribute *attr, char *buf)
4724{
4725 struct st_modedef *STm = dev_get_drvdata(dev);
4726
4727 return sprintf(buf, "%lld",
4728 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4729}
4730static DEVICE_ATTR_RO(read_ns);
4731
4732/**
4733 * write_cnt_show - write count - number of user calls
4734 * to write(2) that have written data to tape.
4735 * @dev: struct device
4736 * @attr: attribute structure
4737 * @buf: buffer to return formatted data in
4738 */
4739static ssize_t write_cnt_show(struct device *dev,
4740 struct device_attribute *attr, char *buf)
4741{
4742 struct st_modedef *STm = dev_get_drvdata(dev);
4743
4744 return sprintf(buf, "%lld",
4745 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4746}
4747static DEVICE_ATTR_RO(write_cnt);
4748
4749/**
4750 * write_byte_cnt_show - write byte count - raw count of
4751 * bytes written to tape.
4752 * @dev: struct device
4753 * @attr: attribute structure
4754 * @buf: buffer to return formatted data in
4755 */
4756static ssize_t write_byte_cnt_show(struct device *dev,
4757 struct device_attribute *attr, char *buf)
4758{
4759 struct st_modedef *STm = dev_get_drvdata(dev);
4760
4761 return sprintf(buf, "%lld",
4762 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4763}
4764static DEVICE_ATTR_RO(write_byte_cnt);
4765
4766/**
4767 * write_ns_show - write ns - number of nanoseconds waiting on write
4768 * requests to complete.
4769 * @dev: struct device
4770 * @attr: attribute structure
4771 * @buf: buffer to return formatted data in
4772 */
4773static ssize_t write_ns_show(struct device *dev,
4774 struct device_attribute *attr, char *buf)
4775{
4776 struct st_modedef *STm = dev_get_drvdata(dev);
4777
4778 return sprintf(buf, "%lld",
4779 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4780}
4781static DEVICE_ATTR_RO(write_ns);
4782
4783/**
4784 * in_flight_show - number of I/Os currently in flight -
4785 * in most cases this will be either 0 or 1. It may be higher if someone
4786 * has also issued other SCSI commands such as via an ioctl.
4787 * @dev: struct device
4788 * @attr: attribute structure
4789 * @buf: buffer to return formatted data in
4790 */
4791static ssize_t in_flight_show(struct device *dev,
4792 struct device_attribute *attr, char *buf)
4793{
4794 struct st_modedef *STm = dev_get_drvdata(dev);
4795
4796 return sprintf(buf, "%lld",
4797 (long long)atomic64_read(&STm->tape->stats->in_flight));
4798}
4799static DEVICE_ATTR_RO(in_flight);
4800
4801/**
4802 * io_ns_show - io wait ns - this is the number of ns spent
4803 * waiting on all I/O to complete. This includes tape movement commands
4804 * such as rewinding, seeking to end of file or tape, it also includes
4805 * read and write. To determine the time spent on tape movement
4806 * subtract the read and write ns from this value.
4807 * @dev: struct device
4808 * @attr: attribute structure
4809 * @buf: buffer to return formatted data in
4810 */
4811static ssize_t io_ns_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->tot_io_time));
4818}
4819static DEVICE_ATTR_RO(io_ns);
4820
4821/**
4822 * other_cnt_show - other io count - this is the number of
4823 * I/O requests other than read and write requests.
4824 * Typically these are tape movement requests but will include driver
4825 * tape movement. This includes only requests issued by the st driver.
4826 * @dev: struct device
4827 * @attr: attribute structure
4828 * @buf: buffer to return formatted data in
4829 */
4830static ssize_t other_cnt_show(struct device *dev,
4831 struct device_attribute *attr, char *buf)
4832{
4833 struct st_modedef *STm = dev_get_drvdata(dev);
4834
4835 return sprintf(buf, "%lld",
4836 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4837}
4838static DEVICE_ATTR_RO(other_cnt);
4839
4840/**
4841 * resid_cnt_show - A count of the number of times we get a residual
4842 * count - this should indicate someone issuing reads larger than the
4843 * block size on tape.
4844 * @dev: struct device
4845 * @attr: attribute structure
4846 * @buf: buffer to return formatted data in
4847 */
4848static ssize_t resid_cnt_show(struct device *dev,
4849 struct device_attribute *attr, char *buf)
4850{
4851 struct st_modedef *STm = dev_get_drvdata(dev);
4852
4853 return sprintf(buf, "%lld",
4854 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4855}
4856static DEVICE_ATTR_RO(resid_cnt);
4857
c69c6be5
GKH		 4858static struct attribute *st_dev_attrs[] = {
4859 &dev_attr_defined.attr,
4860 &dev_attr_default_blksize.attr,
4861 &dev_attr_default_density.attr,
4862 &dev_attr_default_compression.attr,
4863 &dev_attr_options.attr,
4864 NULL,
af23782b 4865};
05545c92
SS		 4866
4867static struct attribute *st_stats_attrs[] = {
4868 &dev_attr_read_cnt.attr,
4869 &dev_attr_read_byte_cnt.attr,
4870 &dev_attr_read_ns.attr,
4871 &dev_attr_write_cnt.attr,
4872 &dev_attr_write_byte_cnt.attr,
4873 &dev_attr_write_ns.attr,
4874 &dev_attr_in_flight.attr,
4875 &dev_attr_io_ns.attr,
4876 &dev_attr_other_cnt.attr,
4877 &dev_attr_resid_cnt.attr,
4878 NULL,
4879};
4880
4881static struct attribute_group stats_group = {
4882 .name = "stats",
4883 .attrs = st_stats_attrs,
4884};
4885
4886static struct attribute_group st_group = {
4887 .attrs = st_dev_attrs,
4888};
4889
4890static const struct attribute_group *st_dev_groups[] = {
4891 &st_group,
4892 &stats_group,
4893 NULL,
4894};
b174be02 4895
1da177e4 4896/* The following functions may be useful for a larger audience. */
6620742f
FT		 4897static int sgl_map_user_pages(struct st_buffer *STbp,
4898 const unsigned int max_pages, unsigned long uaddr,
4899 size_t count, int rw)
1da177e4 4900{
07542b83
JB		 4901 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4902 unsigned long start = uaddr >> PAGE_SHIFT;
4903 const int nr_pages = end - start;
1da177e4 4904 int res, i, j;
1da177e4 4905 struct page **pages;
6620742f 4906 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4907
1da177e4
LT		 4908 /* User attempted Overflow! */
4909 if ((uaddr + count) < uaddr)
4910 return -EINVAL;
4911
4912 /* Too big */
4913 if (nr_pages > max_pages)
4914 return -ENOMEM;
4915
4916 /* Hmm? */
4917 if (count == 0)
4918 return 0;
4919
6da2ec56
KC		 4920 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4921 if (pages == NULL)
1da177e4
LT		 4922 return -ENOMEM;
4923
4924 /* Try to fault in all of the necessary pages */
1da177e4 4925 /* rw==READ means read from drive, write into memory area */
73b0140b
IW		 4926 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4927 pages);
1da177e4
LT		 4928
4929 /* Errors and no page mapped should return here */
4930 if (res < nr_pages)
4931 goto out_unmap;
4932
4933 for (i=0; i < nr_pages; i++) {
4934 /* FIXME: flush superflous for rw==READ,
4935 * probably wrong function for rw==WRITE
4936 */
4937 flush_dcache_page(pages[i]);
4938 }
4939
6620742f 4940 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4941 STbp->mapped_pages = pages;
1da177e4 4942
1da177e4 4943 return nr_pages;
1da177e4
LT		 4944 out_unmap:
4945 if (res > 0) {
4946 for (j=0; j < res; j++)
09cbfeaf 4947 put_page(pages[j]);
6bc733e9 4948 res = 0;
1da177e4
LT		 4949 }
4950 kfree(pages);
4951 return res;
4952}
4953
4954
4955/* And unmap them... */
6620742f
FT		 4956static int sgl_unmap_user_pages(struct st_buffer *STbp,
4957 const unsigned int nr_pages, int dirtied)
1da177e4
LT		 4958{
4959 int i;
4960
4961 for (i=0; i < nr_pages; i++) {
6620742f 4962 struct page *page = STbp->mapped_pages[i];
b5810039 4963
b5810039
NP		 4964 if (dirtied)
4965 SetPageDirty(page);
1da177e4
LT		 4966 /* FIXME: cache flush missing for rw==READ
4967 * FIXME: call the correct reference counting function
4968 */
09cbfeaf 4969 put_page(page);
1da177e4 4970 }
6620742f
FT		 4971 kfree(STbp->mapped_pages);
4972 STbp->mapped_pages = NULL;
1da177e4
LT		 4973
4974 return 0;
4975}
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