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UBUNTU: Ubuntu-4.13.0-45.50
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / st.c
CommitLineData
1da177e4
LT		 1/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
8038e645 12 Copyright 1992 - 2016 Kai Makisara
1da177e4
LT		 13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
8038e645 20static const char *verstr = "20160209";
1da177e4
LT		 21
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
174cd4b1 26#include <linux/sched/signal.h>
1da177e4
LT		 27#include <linux/mm.h>
28#include <linux/init.h>
29#include <linux/string.h>
5a0e3ad6 30#include <linux/slab.h>
1da177e4
LT		 31#include <linux/errno.h>
32#include <linux/mtio.h>
16c4b3e2 33#include <linux/cdrom.h>
1da177e4
LT		 34#include <linux/ioctl.h>
35#include <linux/fcntl.h>
36#include <linux/spinlock.h>
37#include <linux/blkdev.h>
38#include <linux/moduleparam.h>
1da177e4 39#include <linux/cdev.h>
6c648d95 40#include <linux/idr.h>
1da177e4 41#include <linux/delay.h>
0b950672 42#include <linux/mutex.h>
1da177e4 43
7c0f6ba6 44#include <linux/uaccess.h>
1da177e4 45#include <asm/dma.h>
1da177e4
LT		 46
47#include <scsi/scsi.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/scsi_device.h>
50#include <scsi/scsi_driver.h>
51#include <scsi/scsi_eh.h>
52#include <scsi/scsi_host.h>
53#include <scsi/scsi_ioctl.h>
16c4b3e2 54#include <scsi/sg.h>
1da177e4
LT		 55
56
57/* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
2bec708a
LO		 59#define DEBUG 1
60#define NO_DEBUG 0
1da177e4 61
b30d8bca 62#define ST_DEB_MSG KERN_NOTICE
1da177e4
LT		 63#if DEBUG
64/* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
1da177e4
LT		 67#define DEB(a) a
68#define DEBC(a) if (debugging) { a ; }
69#else
70#define DEB(a)
71#define DEBC(a)
72#endif
73
74#define ST_KILOBYTE 1024
75
76#include "st_options.h"
77#include "st.h"
78
79static int buffer_kbs;
80static int max_sg_segs;
81static int try_direct_io = TRY_DIRECT_IO;
82static int try_rdio = 1;
83static int try_wdio = 1;
2bec708a 84static int debug_flag;
1da177e4 85
af23782b 86static struct class st_sysfs_class;
c69c6be5 87static const struct attribute_group *st_dev_groups[];
442d7562 88static const struct attribute_group *st_drv_groups[];
1da177e4
LT		 89
90MODULE_AUTHOR("Kai Makisara");
f018fa55 91MODULE_DESCRIPTION("SCSI tape (st) driver");
1da177e4 92MODULE_LICENSE("GPL");
f018fa55 93MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
d7b8bcb0 94MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
1da177e4
LT		 95
96/* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100module_param_named(buffer_kbs, buffer_kbs, int, 0);
101MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102module_param_named(max_sg_segs, max_sg_segs, int, 0);
103MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104module_param_named(try_direct_io, try_direct_io, int, 0);
105MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
2bec708a
LO		 106module_param_named(debug_flag, debug_flag, int, 0);
107MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
1da177e4
LT		 109
110/* Extra parameters for testing */
111module_param_named(try_rdio, try_rdio, int, 0);
112MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113module_param_named(try_wdio, try_wdio, int, 0);
114MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116#ifndef MODULE
117static int write_threshold_kbs; /* retained for compatibility */
118static struct st_dev_parm {
119 char *name;
120 int *val;
121} parms[] __initdata = {
122 {
123 "buffer_kbs", &buffer_kbs
124 },
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
127 },
128 {
129 "max_sg_segs", NULL
130 },
131 {
132 "try_direct_io", &try_direct_io
2bec708a
LO		 133 },
134 {
135 "debug_flag", &debug_flag
1da177e4
LT		 136 }
137};
138#endif
139
140/* Restrict the number of modes so that names for all are assigned */
141#if ST_NBR_MODES > 16
142#error "Maximum number of modes is 16"
143#endif
144/* Bit reversed order to get same names for same minors with all
145 mode counts */
0ad78200 146static const char *st_formats[] = {
1da177e4
LT		 147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
149
150/* The default definitions have been moved to st_options.h */
151
152#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
153
154/* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
158#endif
159
160static int debugging = DEBUG;
161
162#define MAX_RETRIES 0
163#define MAX_WRITE_RETRIES 0
164#define MAX_READY_RETRIES 0
165#define NO_TAPE NOT_READY
166
167#define ST_TIMEOUT (900 * HZ)
168#define ST_LONG_TIMEOUT (14000 * HZ)
169
170/* Remove mode bits and auto-rewind bit (7) */
171#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
174
175/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
178
179/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
180 24 bits) */
181#define SET_DENS_AND_BLK 0x10001
182
1da177e4
LT		 183static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184static int st_max_sg_segs = ST_MAX_SG;
185
1da177e4
LT		 186static int modes_defined;
187
1da177e4 188static int enlarge_buffer(struct st_buffer *, int, int);
40f6b36c 189static void clear_buffer(struct st_buffer *);
1da177e4
LT		 190static void normalize_buffer(struct st_buffer *);
191static int append_to_buffer(const char __user *, struct st_buffer *, int);
192static int from_buffer(struct st_buffer *, char __user *, int);
193static void move_buffer_data(struct st_buffer *, int);
1da177e4 194
6620742f 195static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
1da177e4 196 unsigned long, size_t, int);
6620742f 197static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
1da177e4
LT		 198
199static int st_probe(struct device *);
200static int st_remove(struct device *);
1da177e4 201
1da177e4 202static struct scsi_driver st_template = {
1da177e4
LT		 203 .gendrv = {
204 .name = "st",
3af6b352 205 .owner = THIS_MODULE,
1da177e4
LT		 206 .probe = st_probe,
207 .remove = st_remove,
442d7562 208 .groups = st_drv_groups,
1da177e4 209 },
1da177e4
LT		 210};
211
212static int st_compression(struct scsi_tape *, int);
213
214static int find_partition(struct scsi_tape *);
215static int switch_partition(struct scsi_tape *);
216
217static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
f03a5670
KM		 219static void scsi_tape_release(struct kref *);
220
221#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
0b950672 223static DEFINE_MUTEX(st_ref_mutex);
6c648d95
JM		 224static DEFINE_SPINLOCK(st_index_lock);
225static DEFINE_SPINLOCK(st_use_lock);
226static DEFINE_IDR(st_index_idr);
227
f03a5670 228
1da177e4
LT		 229\f
230#include "osst_detect.h"
231#ifndef SIGS_FROM_OSST
232#define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
238#endif
239
f03a5670
KM		 240static struct scsi_tape *scsi_tape_get(int dev)
241{
242 struct scsi_tape *STp = NULL;
243
0b950672 244 mutex_lock(&st_ref_mutex);
6c648d95 245 spin_lock(&st_index_lock);
f03a5670 246
6c648d95 247 STp = idr_find(&st_index_idr, dev);
f03a5670
KM		 248 if (!STp) goto out;
249
250 kref_get(&STp->kref);
251
252 if (!STp->device)
253 goto out_put;
254
255 if (scsi_device_get(STp->device))
256 goto out_put;
257
258 goto out;
259
260out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263out:
6c648d95 264 spin_unlock(&st_index_lock);
0b950672 265 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 266 return STp;
267}
268
269static void scsi_tape_put(struct scsi_tape *STp)
270{
271 struct scsi_device *sdev = STp->device;
272
0b950672 273 mutex_lock(&st_ref_mutex);
f03a5670
KM		 274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
0b950672 276 mutex_unlock(&st_ref_mutex);
f03a5670
KM		 277}
278
1da177e4
LT		 279struct st_reject_data {
280 char *vendor;
281 char *model;
282 char *rev;
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
284};
285
286static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
288 SIGS_FROM_OSST,
289 {NULL, }};
290
291/* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293static char * st_incompatible(struct scsi_device* SDp)
294{
295 struct st_reject_data *rp;
296
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
301 if (rp->driver_hint)
302 return rp->driver_hint;
303 else
304 return "unknown";
305 }
306 return NULL;
307}
308\f
309
310static inline char *tape_name(struct scsi_tape *tape)
311{
312 return tape->disk->disk_name;
313}
314
b30d8bca 315#define st_printk(prefix, t, fmt, a...) \
22e0d994 316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
b30d8bca
HR		 317#ifdef DEBUG
318#define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
320#else
321#define DEBC_printk(t, fmt, a...)
322#endif
1da177e4 323
8b05b773 324static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
1da177e4
LT		 325{
326 const u8 *ucp;
8b05b773 327 const u8 *sense = SRpnt->sense;
1da177e4 328
8b05b773
MC		 329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
1da177e4
LT		 331 s->flags = 0;
332
333 if (s->have_sense) {
334 s->deferred = 0;
335 s->remainder_valid =
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
338 case 0x71:
339 s->deferred = 1;
340 case 0x70:
341 s->fixed_format = 1;
342 s->flags = sense[2] & 0xe0;
343 break;
344 case 0x73:
345 s->deferred = 1;
346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353}
354
355
356/* Convert the result to success code */
8b05b773 357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
1da177e4 358{
8b05b773 359 int result = SRpnt->result;
1da177e4
LT		 360 u8 scode;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
f03a5670 369 st_analyze_sense(SRpnt, cmdstatp);
1da177e4
LT		 370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
b30d8bca
HR		 376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
1da177e4 382 if (cmdstatp->have_sense)
d811b848
HR		 383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
b30d8bca
HR		 388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
1da177e4
LT		 391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
8b05b773
MC		 397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
4e73ea7b 399
d811b848
HR		 400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
8b05b773 408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
8b05b773 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
1da177e4
LT		 412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422#if ST_RECOVERED_WRITE_FATAL
8b05b773
MC		 423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
1da177e4
LT		 425#endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
b30d8bca 430 DEB(
1da177e4 431 if (debugging) {
8b05b773 432 if (SRpnt->cmd[0] == READ_6)
1da177e4 433 stp = "read";
8b05b773 434 else if (SRpnt->cmd[0] == WRITE_6)
1da177e4
LT		 435 stp = "write";
436 else
437 stp = "ioctl";
b30d8bca
HR		 438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
1da177e4
LT		 441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447}
448
4deba245 449static struct st_request *st_allocate_request(struct scsi_tape *stp)
8b05b773 450{
4deba245
FT		 451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
b30d8bca
HR		 457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
4deba245
FT		 459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
8b05b773
MC		 466}
467
468static void st_release_request(struct st_request *streq)
469{
470 kfree(streq);
1da177e4
LT		 471}
472
05545c92
SS		 473static void st_do_stats(struct scsi_tape *STp, struct request *req)
474{
475 ktime_t now;
476
477 now = ktime_get();
82ed4db4 478 if (scsi_req(req)->cmd[0] == WRITE_6) {
05545c92
SS		 479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
17d5363b 483 if (scsi_req(req)->result) {
05545c92
SS		 484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
82ed4db4 492 } else if (scsi_req(req)->cmd[0] == READ_6) {
05545c92
SS		 493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
17d5363b 497 if (scsi_req(req)->result) {
05545c92
SS		 498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512}
513
2a842aca 514static void st_scsi_execute_end(struct request *req, blk_status_t status)
13b53b44
FT		 515{
516 struct st_request *SRpnt = req->end_io_data;
82ed4db4 517 struct scsi_request *rq = scsi_req(req);
13b53b44 518 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 519 struct bio *tmp;
13b53b44 520
17d5363b 521 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
82ed4db4 522 STp->buffer->cmdstat.residual = rq->resid_len;
13b53b44 523
05545c92
SS		 524 st_do_stats(STp, req);
525
c68bf8ee 526 tmp = SRpnt->bio;
82ed4db4
CH		 527 if (rq->sense_len)
528 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
13b53b44
FT		 529 if (SRpnt->waiting)
530 complete(SRpnt->waiting);
531
c68bf8ee 532 blk_rq_unmap_user(tmp);
13b53b44
FT		 533 __blk_put_request(req->q, req);
534}
535
536static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
537 int data_direction, void *buffer, unsigned bufflen,
538 int timeout, int retries)
539{
540 struct request *req;
82ed4db4 541 struct scsi_request *rq;
13b53b44
FT		 542 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
543 int err = 0;
05545c92 544 struct scsi_tape *STp = SRpnt->stp;
13b53b44 545
aebf526b
CH		 546 req = blk_get_request(SRpnt->stp->device->request_queue,
547 data_direction == DMA_TO_DEVICE ?
548 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
a492f075 549 if (IS_ERR(req))
13b53b44 550 return DRIVER_ERROR << 24;
82ed4db4 551 rq = scsi_req(req);
e8064021 552 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 553
554 mdata->null_mapped = 1;
555
02ae2c0e
KM		 556 if (bufflen) {
557 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
558 GFP_KERNEL);
559 if (err) {
560 blk_put_request(req);
561 return DRIVER_ERROR << 24;
562 }
13b53b44
FT		 563 }
564
05545c92
SS		 565 atomic64_inc(&STp->stats->in_flight);
566 if (cmd[0] == WRITE_6) {
567 atomic_set(&STp->stats->last_write_size, bufflen);
568 STp->stats->write_time = ktime_get();
569 } else if (cmd[0] == READ_6) {
570 atomic_set(&STp->stats->last_read_size, bufflen);
571 STp->stats->read_time = ktime_get();
572 } else {
573 STp->stats->other_time = ktime_get();
574 }
575
13b53b44 576 SRpnt->bio = req->bio;
82ed4db4
CH		 577 rq->cmd_len = COMMAND_SIZE(cmd[0]);
578 memset(rq->cmd, 0, BLK_MAX_CDB);
579 memcpy(rq->cmd, cmd, rq->cmd_len);
13b53b44 580 req->timeout = timeout;
64c7f1d1 581 rq->retries = retries;
13b53b44
FT		 582 req->end_io_data = SRpnt;
583
584 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
585 return 0;
586}
587
1da177e4
LT		 588/* Do the scsi command. Waits until command performed if do_wait is true.
589 Otherwise write_behind_check() is used to check that the command
590 has finished. */
8b05b773
MC		 591static struct st_request *
592st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 593 int bytes, int direction, int timeout, int retries, int do_wait)
594{
f03a5670 595 struct completion *waiting;
6d476267
FT		 596 struct rq_map_data *mdata = &STp->buffer->map_data;
597 int ret;
1da177e4 598
f03a5670
KM		 599 /* if async, make sure there's no command outstanding */
600 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 601 st_printk(KERN_ERR, STp,
602 "Async command already active.\n");
f03a5670
KM		 603 if (signal_pending(current))
604 (STp->buffer)->syscall_result = (-EINTR);
605 else
606 (STp->buffer)->syscall_result = (-EBUSY);
607 return NULL;
608 }
609
4deba245
FT		 610 if (!SRpnt) {
611 SRpnt = st_allocate_request(STp);
612 if (!SRpnt)
1da177e4 613 return NULL;
1da177e4
LT		 614 }
615
f03a5670
KM		 616 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
617 which IO is outstanding. It's nulled out when the IO completes. */
618 if (!do_wait)
619 (STp->buffer)->last_SRpnt = SRpnt;
620
621 waiting = &STp->wait;
622 init_completion(waiting);
8b05b773 623 SRpnt->waiting = waiting;
1da177e4 624
6620742f 625 if (STp->buffer->do_dio) {
c982c368 626 mdata->page_order = 0;
6620742f
FT		 627 mdata->nr_entries = STp->buffer->sg_segs;
628 mdata->pages = STp->buffer->mapped_pages;
629 } else {
c982c368 630 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 631 mdata->nr_entries =
632 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 633 mdata->pages = STp->buffer->reserved_pages;
634 mdata->offset = 0;
6d476267
FT		 635 }
636
8b05b773
MC		 637 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
638 STp->buffer->cmdstat.have_sense = 0;
639 STp->buffer->syscall_result = 0;
640
6620742f
FT		 641 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
642 retries);
6d476267 643 if (ret) {
8b05b773
MC		 644 /* could not allocate the buffer or request was too large */
645 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 646 (STp->buffer)->last_SRpnt = NULL;
6d476267 647 } else if (do_wait) {
f03a5670 648 wait_for_completion(waiting);
8b05b773 649 SRpnt->waiting = NULL;
1da177e4
LT		 650 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
651 }
8b05b773 652
1da177e4
LT		 653 return SRpnt;
654}
655
656
657/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
658 write has been correct but EOM early warning reached, -EIO if write ended in
659 error or zero if write successful. Asynchronous writes are used only in
660 variable block mode. */
661static int write_behind_check(struct scsi_tape * STp)
662{
663 int retval = 0;
664 struct st_buffer *STbuffer;
665 struct st_partstat *STps;
666 struct st_cmdstatus *cmdstatp;
8b05b773 667 struct st_request *SRpnt;
1da177e4
LT		 668
669 STbuffer = STp->buffer;
670 if (!STbuffer->writing)
671 return 0;
672
b30d8bca 673 DEB(
1da177e4
LT		 674 if (STp->write_pending)
675 STp->nbr_waits++;
676 else
677 STp->nbr_finished++;
b30d8bca 678 ) /* end DEB */
1da177e4
LT		 679
680 wait_for_completion(&(STp->wait));
f03a5670
KM		 681 SRpnt = STbuffer->last_SRpnt;
682 STbuffer->last_SRpnt = NULL;
8b05b773 683 SRpnt->waiting = NULL;
1da177e4 684
f03a5670 685 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 686 st_release_request(SRpnt);
1da177e4
LT		 687
688 STbuffer->buffer_bytes -= STbuffer->writing;
689 STps = &(STp->ps[STp->partition]);
690 if (STps->drv_block >= 0) {
691 if (STp->block_size == 0)
692 STps->drv_block++;
693 else
694 STps->drv_block += STbuffer->writing / STp->block_size;
695 }
696
697 cmdstatp = &STbuffer->cmdstat;
698 if (STbuffer->syscall_result) {
699 retval = -EIO;
700 if (cmdstatp->have_sense && !cmdstatp->deferred &&
701 (cmdstatp->flags & SENSE_EOM) &&
702 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
703 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
704 /* EOM at write-behind, has all data been written? */
705 if (!cmdstatp->remainder_valid ||
706 cmdstatp->uremainder64 == 0)
707 retval = -ENOSPC;
708 }
709 if (retval == -EIO)
710 STps->drv_block = -1;
711 }
712 STbuffer->writing = 0;
713
714 DEB(if (debugging && retval)
b30d8bca
HR		 715 st_printk(ST_DEB_MSG, STp,
716 "Async write error %x, return value %d.\n",
717 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 718
719 return retval;
720}
721
722
723/* Step over EOF if it has been inadvertently crossed (ioctl not used because
724 it messes up the block number). */
725static int cross_eof(struct scsi_tape * STp, int forward)
726{
8b05b773 727 struct st_request *SRpnt;
1da177e4
LT		 728 unsigned char cmd[MAX_COMMAND_SIZE];
729
730 cmd[0] = SPACE;
731 cmd[1] = 0x01; /* Space FileMarks */
732 if (forward) {
733 cmd[2] = cmd[3] = 0;
734 cmd[4] = 1;
735 } else
736 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
737 cmd[5] = 0;
738
b30d8bca
HR		 739 DEBC_printk(STp, "Stepping over filemark %s.\n",
740 forward ? "forward" : "backward");
1da177e4 741
02ae2c0e
KM		 742 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
743 STp->device->request_queue->rq_timeout,
744 MAX_RETRIES, 1);
1da177e4 745 if (!SRpnt)
02ae2c0e 746 return (STp->buffer)->syscall_result;
39ade4b1 747
02ae2c0e
KM		 748 st_release_request(SRpnt);
749 SRpnt = NULL;
1da177e4
LT		 750
751 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 752 st_printk(KERN_ERR, STp,
753 "Stepping over filemark %s failed.\n",
754 forward ? "forward" : "backward");
1da177e4 755
02ae2c0e 756 return (STp->buffer)->syscall_result;
1da177e4
LT		 757}
758
759
760/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 761static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 762{
786231af 763 int transfer, blks;
1da177e4
LT		 764 int result;
765 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 766 struct st_request *SRpnt;
1da177e4
LT		 767 struct st_partstat *STps;
768
769 result = write_behind_check(STp);
770 if (result)
771 return result;
772
773 result = 0;
774 if (STp->dirty == 1) {
775
786231af 776 transfer = STp->buffer->buffer_bytes;
b30d8bca 777 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 778
1da177e4
LT		 779 memset(cmd, 0, MAX_COMMAND_SIZE);
780 cmd[0] = WRITE_6;
781 cmd[1] = 1;
782 blks = transfer / STp->block_size;
783 cmd[2] = blks >> 16;
784 cmd[3] = blks >> 8;
785 cmd[4] = blks;
786
787 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 788 STp->device->request_queue->rq_timeout,
789 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 790 if (!SRpnt)
791 return (STp->buffer)->syscall_result;
792
793 STps = &(STp->ps[STp->partition]);
794 if ((STp->buffer)->syscall_result != 0) {
795 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
796
797 if (cmdstatp->have_sense && !cmdstatp->deferred &&
798 (cmdstatp->flags & SENSE_EOM) &&
799 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
800 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
801 (!cmdstatp->remainder_valid ||
802 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
803 STp->dirty = 0;
804 (STp->buffer)->buffer_bytes = 0;
805 if (STps->drv_block >= 0)
806 STps->drv_block += blks;
807 result = (-ENOSPC);
808 } else {
b30d8bca 809 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 810 STps->drv_block = (-1);
811 result = (-EIO);
812 }
813 } else {
814 if (STps->drv_block >= 0)
815 STps->drv_block += blks;
816 STp->dirty = 0;
817 (STp->buffer)->buffer_bytes = 0;
818 }
8b05b773 819 st_release_request(SRpnt);
1da177e4
LT		 820 SRpnt = NULL;
821 }
822 return result;
823}
824
825
826/* Flush the tape buffer. The tape will be positioned correctly unless
827 seek_next is true. */
828static int flush_buffer(struct scsi_tape *STp, int seek_next)
829{
830 int backspace, result;
831 struct st_buffer *STbuffer;
832 struct st_partstat *STps;
833
834 STbuffer = STp->buffer;
835
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 */
2727 case MTFSF:
2728 cmd[0] = SPACE;
2729 cmd[1] = 0x01; /* Space FileMarks */
2730 cmd[2] = (arg >> 16);
2731 cmd[3] = (arg >> 8);
2732 cmd[4] = arg;
b30d8bca 2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2734 if (fileno >= 0)
2735 fileno += arg;
2736 blkno = 0;
2737 at_sm &= (arg == 0);
2738 break;
2739 case MTBSFM:
2740 chg_eof = 0; /* Changed from the FSF after this */
2741 case MTBSF:
2742 cmd[0] = SPACE;
2743 cmd[1] = 0x01; /* Space FileMarks */
2744 ltmp = (-arg);
2745 cmd[2] = (ltmp >> 16);
2746 cmd[3] = (ltmp >> 8);
2747 cmd[4] = ltmp;
b30d8bca 2748 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2749 if (fileno >= 0)
2750 fileno -= arg;
2751 blkno = (-1); /* We can't know the block number */
2752 at_sm &= (arg == 0);
2753 break;
2754 case MTFSR:
2755 cmd[0] = SPACE;
2756 cmd[1] = 0x00; /* Space Blocks */
2757 cmd[2] = (arg >> 16);
2758 cmd[3] = (arg >> 8);
2759 cmd[4] = arg;
b30d8bca 2760 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2761 if (blkno >= 0)
2762 blkno += arg;
2763 at_sm &= (arg == 0);
2764 break;
2765 case MTBSR:
2766 cmd[0] = SPACE;
2767 cmd[1] = 0x00; /* Space Blocks */
2768 ltmp = (-arg);
2769 cmd[2] = (ltmp >> 16);
2770 cmd[3] = (ltmp >> 8);
2771 cmd[4] = ltmp;
b30d8bca 2772 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2773 if (blkno >= 0)
2774 blkno -= arg;
2775 at_sm &= (arg == 0);
2776 break;
2777 case MTFSS:
2778 cmd[0] = SPACE;
2779 cmd[1] = 0x04; /* Space Setmarks */
2780 cmd[2] = (arg >> 16);
2781 cmd[3] = (arg >> 8);
2782 cmd[4] = arg;
b30d8bca 2783 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2784 if (arg != 0) {
2785 blkno = fileno = (-1);
2786 at_sm = 1;
2787 }
2788 break;
2789 case MTBSS:
2790 cmd[0] = SPACE;
2791 cmd[1] = 0x04; /* Space Setmarks */
2792 ltmp = (-arg);
2793 cmd[2] = (ltmp >> 16);
2794 cmd[3] = (ltmp >> 8);
2795 cmd[4] = ltmp;
b30d8bca 2796 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2797 if (arg != 0) {
2798 blkno = fileno = (-1);
2799 at_sm = 1;
2800 }
2801 break;
2802 case MTWEOF:
3e51d3c9 2803 case MTWEOFI:
1da177e4
LT		 2804 case MTWSM:
2805 if (STp->write_prot)
2806 return (-EACCES);
2807 cmd[0] = WRITE_FILEMARKS;
2808 if (cmd_in == MTWSM)
2809 cmd[1] = 2;
c743e44f
LD		 2810 if (cmd_in == MTWEOFI ||
2811 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2812 cmd[1] |= 1;
1da177e4
LT		 2813 cmd[2] = (arg >> 16);
2814 cmd[3] = (arg >> 8);
2815 cmd[4] = arg;
a02488ed 2816 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2817 DEBC(
2818 if (cmd_in != MTWSM)
2819 st_printk(ST_DEB_MSG, STp,
2820 "Writing %d filemarks.\n",
2821 cmd[2] * 65536 +
2822 cmd[3] * 256 +
2823 cmd[4]);
2824 else
2825 st_printk(ST_DEB_MSG, STp,
2826 "Writing %d setmarks.\n",
2827 cmd[2] * 65536 +
2828 cmd[3] * 256 +
2829 cmd[4]);
1da177e4
LT		 2830 )
2831 if (fileno >= 0)
2832 fileno += arg;
2833 blkno = 0;
2834 at_sm = (cmd_in == MTWSM);
2835 break;
2836 case MTREW:
2837 cmd[0] = REZERO_UNIT;
2838 if (STp->immediate) {
2839 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2840 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2841 }
b30d8bca 2842 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2843 fileno = blkno = at_sm = 0;
2844 break;
2845 case MTNOP:
b30d8bca 2846 DEBC_printk(STp, "No op on tape.\n");
1da177e4
LT		 2847 return 0; /* Should do something ? */
2848 break;
2849 case MTRETEN:
2850 cmd[0] = START_STOP;
2851 if (STp->immediate) {
2852 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2853 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2854 }
2855 cmd[4] = 3;
b30d8bca 2856 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2857 fileno = blkno = at_sm = 0;
2858 break;
2859 case MTEOM:
2860 if (!STp->fast_mteom) {
2861 /* space to the end of tape */
2862 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2863 fileno = STps->drv_file;
2864 if (STps->eof >= ST_EOD_1)
2865 return 0;
2866 /* The next lines would hide the number of spaced FileMarks
2867 That's why I inserted the previous lines. I had no luck
2868 with detecting EOM with FSF, so we go now to EOM.
2869 Joerg Weule */
2870 } else
2871 fileno = (-1);
2872 cmd[0] = SPACE;
2873 cmd[1] = 3;
b30d8bca 2874 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2875 blkno = -1;
2876 at_sm = 0;
2877 break;
2878 case MTERASE:
2879 if (STp->write_prot)
2880 return (-EACCES);
2881 cmd[0] = ERASE;
2882 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2883 if (STp->immediate) {
2884 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2885 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2886 }
2887 else
2888 timeout = STp->long_timeout * 8;
2889
b30d8bca 2890 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2891 fileno = blkno = at_sm = 0;
2892 break;
2893 case MTSETBLK: /* Set block length */
2894 case MTSETDENSITY: /* Set tape density */
2895 case MTSETDRVBUFFER: /* Set drive buffering */
2896 case SET_DENS_AND_BLK: /* Set density and block size */
2897 chg_eof = 0;
2898 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2899 return (-EIO); /* Not allowed if data in buffer */
2900 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2901 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2902 STp->max_block > 0 &&
2903 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2904 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2905 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2906 return (-EINVAL);
2907 }
2908 cmd[0] = MODE_SELECT;
2909 if ((STp->use_pf & USE_PF))
2910 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2911 cmd[4] = datalen = 12;
2912 direction = DMA_TO_DEVICE;
2913
2914 memset((STp->buffer)->b_data, 0, 12);
2915 if (cmd_in == MTSETDRVBUFFER)
2916 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2917 else
2918 (STp->buffer)->b_data[2] =
2919 STp->drv_buffer << 4;
2920 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2921 if (cmd_in == MTSETDENSITY) {
2922 (STp->buffer)->b_data[4] = arg;
2923 STp->density_changed = 1; /* At least we tried ;-) */
2924 } else if (cmd_in == SET_DENS_AND_BLK)
2925 (STp->buffer)->b_data[4] = arg >> 24;
2926 else
2927 (STp->buffer)->b_data[4] = STp->density;
2928 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2929 ltmp = arg & MT_ST_BLKSIZE_MASK;
2930 if (cmd_in == MTSETBLK)
2931 STp->blksize_changed = 1; /* At least we tried ;-) */
2932 } else
2933 ltmp = STp->block_size;
2934 (STp->buffer)->b_data[9] = (ltmp >> 16);
2935 (STp->buffer)->b_data[10] = (ltmp >> 8);
2936 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2937 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2938 DEBC(
1da177e4 2939 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2940 st_printk(ST_DEB_MSG, STp,
2941 "Setting block size to %d bytes.\n",
2942 (STp->buffer)->b_data[9] * 65536 +
2943 (STp->buffer)->b_data[10] * 256 +
2944 (STp->buffer)->b_data[11]);
1da177e4 2945 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting density code to %x.\n",
2948 (STp->buffer)->b_data[4]);
1da177e4 2949 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2950 st_printk(ST_DEB_MSG, STp,
2951 "Setting drive buffer code to %d.\n",
2952 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2953 )
2954 break;
2955 default:
2956 return (-ENOSYS);
2957 }
2958
02ae2c0e
KM		 2959 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2960 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2961 if (!SRpnt)
2962 return (STp->buffer)->syscall_result;
2963
02ae2c0e 2964 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2965
2966 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2967 st_release_request(SRpnt);
1da177e4
LT		 2968 SRpnt = NULL;
2969 STps->drv_block = blkno;
2970 STps->drv_file = fileno;
2971 STps->at_sm = at_sm;
2972
2973 if (cmd_in == MTBSFM)
2974 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2975 else if (cmd_in == MTFSFM)
2976 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2977
2978 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2979 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2980 if (STp->block_size != 0) {
1da177e4
LT		 2981 (STp->buffer)->buffer_blocks =
2982 (STp->buffer)->buffer_size / STp->block_size;
2983 }
2984 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2985 if (cmd_in == SET_DENS_AND_BLK)
2986 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2987 } else if (cmd_in == MTSETDRVBUFFER)
2988 STp->drv_buffer = (arg & 7);
2989 else if (cmd_in == MTSETDENSITY)
2990 STp->density = arg;
2991
2992 if (cmd_in == MTEOM)
2993 STps->eof = ST_EOD;
2994 else if (cmd_in == MTFSF)
2995 STps->eof = ST_FM;
2996 else if (chg_eof)
2997 STps->eof = ST_NOEOF;
2998
3e51d3c9
KM		 2999 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3000 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 3001 } else { /* SCSI command was not completely successful. Don't return
3002 from this block without releasing the SCSI command block! */
3003 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3004
3005 if (cmdstatp->flags & SENSE_EOM) {
3006 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3007 cmd_in != MTBSR && cmd_in != MTBSS)
3008 STps->eof = ST_EOM_OK;
3009 STps->drv_block = 0;
3010 }
3011
3012 if (cmdstatp->remainder_valid)
3013 undone = (int)cmdstatp->uremainder64;
3014 else
3015 undone = 0;
3016
3e51d3c9 3017 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3018 cmdstatp->have_sense &&
91614c05
KM		 3019 (cmdstatp->flags & SENSE_EOM)) {
3020 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3021 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3022 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3023 STps->eof = ST_NOEOF;
3024 } else { /* Writing EOF(s) failed */
3025 if (fileno >= 0)
3026 fileno -= undone;
3027 if (undone < arg)
3028 STps->eof = ST_NOEOF;
3029 }
1da177e4 3030 STps->drv_file = fileno;
1da177e4
LT		 3031 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3032 if (fileno >= 0)
3033 STps->drv_file = fileno - undone;
3034 else
3035 STps->drv_file = fileno;
3036 STps->drv_block = -1;
3037 STps->eof = ST_NOEOF;
3038 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3039 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3040 undone = (-undone);
3041 if (STps->drv_file >= 0)
3042 STps->drv_file = fileno + undone;
3043 STps->drv_block = 0;
3044 STps->eof = ST_NOEOF;
3045 } else if (cmd_in == MTFSR) {
3046 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3047 if (STps->drv_file >= 0)
3048 STps->drv_file++;
3049 STps->drv_block = 0;
3050 STps->eof = ST_FM;
3051 } else {
3052 if (blkno >= undone)
3053 STps->drv_block = blkno - undone;
3054 else
3055 STps->drv_block = (-1);
3056 STps->eof = ST_NOEOF;
3057 }
3058 } else if (cmd_in == MTBSR) {
3059 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3060 STps->drv_file--;
3061 STps->drv_block = (-1);
3062 } else {
3063 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3064 undone = (-undone);
3065 if (STps->drv_block >= 0)
3066 STps->drv_block = blkno + undone;
3067 }
3068 STps->eof = ST_NOEOF;
3069 } else if (cmd_in == MTEOM) {
3070 STps->drv_file = (-1);
3071 STps->drv_block = (-1);
3072 STps->eof = ST_EOD;
3073 } else if (cmd_in == MTSETBLK ||
3074 cmd_in == MTSETDENSITY ||
3075 cmd_in == MTSETDRVBUFFER ||
3076 cmd_in == SET_DENS_AND_BLK) {
3077 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3078 !(STp->use_pf & PF_TESTED)) {
3079 /* Try the other possible state of Page Format if not
3080 already tried */
1da2019f 3081 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3082 st_release_request(SRpnt);
1da177e4
LT		 3083 SRpnt = NULL;
3084 return st_int_ioctl(STp, cmd_in, arg);
3085 }
3086 } else if (chg_eof)
3087 STps->eof = ST_NOEOF;
3088
3089 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3090 STps->eof = ST_EOD;
3091
8b05b773 3092 st_release_request(SRpnt);
1da177e4
LT		 3093 SRpnt = NULL;
3094 }
3095
3096 return ioctl_result;
3097}
3098\f
3099
3100/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3101 structure. */
3102
3103static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3104 int logical)
3105{
3106 int result;
3107 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3108 struct st_request *SRpnt;
1da177e4
LT		 3109
3110 if (STp->ready != ST_READY)
3111 return (-EIO);
3112
3113 memset(scmd, 0, MAX_COMMAND_SIZE);
3114 if ((STp->device)->scsi_level < SCSI_2) {
3115 scmd[0] = QFA_REQUEST_BLOCK;
3116 scmd[4] = 3;
3117 } else {
3118 scmd[0] = READ_POSITION;
3119 if (!logical && !STp->scsi2_logical)
3120 scmd[1] = 1;
3121 }
02ae2c0e
KM		 3122 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3123 STp->device->request_queue->rq_timeout,
3124 MAX_READY_RETRIES, 1);
1da177e4 3125 if (!SRpnt)
02ae2c0e 3126 return (STp->buffer)->syscall_result;
1da177e4
LT		 3127
3128 if ((STp->buffer)->syscall_result != 0 ||
3129 (STp->device->scsi_level >= SCSI_2 &&
3130 ((STp->buffer)->b_data[0] & 4) != 0)) {
3131 *block = *partition = 0;
b30d8bca 3132 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3133 result = (-EIO);
3134 } else {
3135 result = 0;
3136 if ((STp->device)->scsi_level < SCSI_2) {
3137 *block = ((STp->buffer)->b_data[0] << 16)
3138 + ((STp->buffer)->b_data[1] << 8)
3139 + (STp->buffer)->b_data[2];
3140 *partition = 0;
3141 } else {
3142 *block = ((STp->buffer)->b_data[4] << 24)
3143 + ((STp->buffer)->b_data[5] << 16)
3144 + ((STp->buffer)->b_data[6] << 8)
3145 + (STp->buffer)->b_data[7];
3146 *partition = (STp->buffer)->b_data[1];
3147 if (((STp->buffer)->b_data[0] & 0x80) &&
3148 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3149 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3150 }
b30d8bca
HR		 3151 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3152 *block, *partition);
1da177e4 3153 }
8b05b773 3154 st_release_request(SRpnt);
1da177e4
LT		 3155 SRpnt = NULL;
3156
3157 return result;
3158}
3159
3160
3161/* Set the tape block and partition. Negative partition means that only the
3162 block should be set in vendor specific way. */
3163static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3164 int logical)
3165{
3166 struct st_partstat *STps;
3167 int result, p;
3168 unsigned int blk;
3169 int timeout;
3170 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3171 struct st_request *SRpnt;
1da177e4
LT		 3172
3173 if (STp->ready != ST_READY)
3174 return (-EIO);
3175 timeout = STp->long_timeout;
3176 STps = &(STp->ps[STp->partition]);
3177
b30d8bca
HR		 3178 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3179 block, partition);
1da177e4
LT		 3180 DEB(if (partition < 0)
3181 return (-EIO); )
3182
3183 /* Update the location at the partition we are leaving */
3184 if ((!STp->can_partitions && partition != 0) ||
3185 partition >= ST_NBR_PARTITIONS)
3186 return (-EINVAL);
3187 if (partition != STp->partition) {
3188 if (get_location(STp, &blk, &p, 1))
3189 STps->last_block_valid = 0;
3190 else {
3191 STps->last_block_valid = 1;
3192 STps->last_block_visited = blk;
b30d8bca
HR		 3193 DEBC_printk(STp, "Visited block %d for "
3194 "partition %d saved.\n",
3195 blk, STp->partition);
1da177e4
LT		 3196 }
3197 }
3198
3199 memset(scmd, 0, MAX_COMMAND_SIZE);
3200 if ((STp->device)->scsi_level < SCSI_2) {
3201 scmd[0] = QFA_SEEK_BLOCK;
3202 scmd[2] = (block >> 16);
3203 scmd[3] = (block >> 8);
3204 scmd[4] = block;
3205 scmd[5] = 0;
3206 } else {
3207 scmd[0] = SEEK_10;
3208 scmd[3] = (block >> 24);
3209 scmd[4] = (block >> 16);
3210 scmd[5] = (block >> 8);
3211 scmd[6] = block;
3212 if (!logical && !STp->scsi2_logical)
3213 scmd[1] = 4;
3214 if (STp->partition != partition) {
3215 scmd[1] |= 2;
3216 scmd[8] = partition;
b30d8bca
HR		 3217 DEBC_printk(STp, "Trying to change partition "
3218 "from %d to %d\n", STp->partition,
3219 partition);
1da177e4
LT		 3220 }
3221 }
3222 if (STp->immediate) {
3223 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3224 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3225 }
3226
02ae2c0e
KM		 3227 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3228 timeout, MAX_READY_RETRIES, 1);
1da177e4 3229 if (!SRpnt)
02ae2c0e 3230 return (STp->buffer)->syscall_result;
1da177e4
LT		 3231
3232 STps->drv_block = STps->drv_file = (-1);
3233 STps->eof = ST_NOEOF;
3234 if ((STp->buffer)->syscall_result != 0) {
3235 result = (-EIO);
3236 if (STp->can_partitions &&
3237 (STp->device)->scsi_level >= SCSI_2 &&
3238 (p = find_partition(STp)) >= 0)
3239 STp->partition = p;
3240 } else {
3241 if (STp->can_partitions) {
3242 STp->partition = partition;
3243 STps = &(STp->ps[partition]);
3244 if (!STps->last_block_valid ||
3245 STps->last_block_visited != block) {
3246 STps->at_sm = 0;
3247 STps->rw = ST_IDLE;
3248 }
3249 } else
3250 STps->at_sm = 0;
3251 if (block == 0)
3252 STps->drv_block = STps->drv_file = 0;
3253 result = 0;
3254 }
02ae2c0e 3255
8b05b773 3256 st_release_request(SRpnt);
1da177e4
LT		 3257 SRpnt = NULL;
3258
3259 return result;
3260}
3261
3262
3263/* Find the current partition number for the drive status. Called from open and
3264 returns either partition number of negative error code. */
3265static int find_partition(struct scsi_tape *STp)
3266{
3267 int i, partition;
3268 unsigned int block;
3269
3270 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3271 return i;
3272 if (partition >= ST_NBR_PARTITIONS)
3273 return (-EIO);
3274 return partition;
3275}
3276
3277
3278/* Change the partition if necessary */
3279static int switch_partition(struct scsi_tape *STp)
3280{
3281 struct st_partstat *STps;
3282
3283 if (STp->partition == STp->new_partition)
3284 return 0;
3285 STps = &(STp->ps[STp->new_partition]);
3286 if (!STps->last_block_valid)
3287 STps->last_block_visited = 0;
3288 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3289}
3290\f
3291/* Functions for reading and writing the medium partition mode page. */
3292
3293#define PART_PAGE 0x11
3294#define PART_PAGE_FIXED_LENGTH 8
3295
3296#define PP_OFF_MAX_ADD_PARTS 2
3297#define PP_OFF_NBR_ADD_PARTS 3
3298#define PP_OFF_FLAGS 4
3299#define PP_OFF_PART_UNITS 6
3300#define PP_OFF_RESERVED 7
3301
3302#define PP_BIT_IDP 0x20
8038e645 3303#define PP_BIT_FDP 0x80
1da177e4 3304#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3305#define PP_MSK_PSUM_UNITS 0x18
3306#define PP_MSK_POFM 0x04
1da177e4
LT		 3307
3308/* Get the number of partitions on the tape. As a side effect reads the
3309 mode page into the tape buffer. */
3310static int nbr_partitions(struct scsi_tape *STp)
3311{
3312 int result;
1da177e4
LT		 3313
3314 if (STp->ready != ST_READY)
3315 return (-EIO);
3316
3317 result = read_mode_page(STp, PART_PAGE, 1);
3318
3319 if (result) {
b30d8bca 3320 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3321 result = (-EIO);
3322 } else {
3323 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3324 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3325 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3326 }
3327
3328 return result;
3329}
3330
3331
8038e645
KM		 3332static int format_medium(struct scsi_tape *STp, int format)
3333{
3334 int result = 0;
3335 int timeout = STp->long_timeout;
3336 unsigned char scmd[MAX_COMMAND_SIZE];
3337 struct st_request *SRpnt;
3338
3339 memset(scmd, 0, MAX_COMMAND_SIZE);
3340 scmd[0] = FORMAT_UNIT;
3341 scmd[2] = format;
3342 if (STp->immediate) {
3343 scmd[1] |= 1; /* Don't wait for completion */
3344 timeout = STp->device->request_queue->rq_timeout;
3345 }
3346 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3347 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3348 timeout, MAX_RETRIES, 1);
3349 if (!SRpnt)
3350 result = STp->buffer->syscall_result;
3351 return result;
3352}
3353
3354
1da177e4
LT		 3355/* Partition the tape into two partitions if size > 0 or one partition if
3356 size == 0.
3357
3358 The block descriptors are read and written because Sony SDT-7000 does not
3359 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3360
3361 My HP C1533A drive returns only one partition size field. This is used to
3362 set the size of partition 1. There is no size field for the default partition.
3363 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3364 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3365 The following algorithm is used to accommodate both drives: if the number of
3366 partition size fields is greater than the maximum number of additional partitions
3367 in the mode page, the second field is used. Otherwise the first field is used.
3368
3369 For Seagate DDS drives the page length must be 8 when no partitions is defined
3370 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3371 is acceptable also to some other old drives and enforced if the first partition
3372 size field is used for the first additional partition size.
8038e645
KM		 3373
3374 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3375 */
3376static int partition_tape(struct scsi_tape *STp, int size)
3377{
1da177e4 3378 int result;
8038e645
KM		 3379 int target_partition;
3380 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3381 int pgo, psd_cnt, psdo;
8038e645 3382 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3383 unsigned char *bp;
3384
3385 result = read_mode_page(STp, PART_PAGE, 0);
3386 if (result) {
b30d8bca 3387 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3388 return result;
3389 }
8038e645
KM		 3390 target_partition = 1;
3391 if (size < 0) {
3392 target_partition = 0;
3393 size = -size;
3394 }
3395
1da177e4
LT		 3396 /* The mode page is in the buffer. Let's modify it and write it. */
3397 bp = (STp->buffer)->b_data;
3398 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3399 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3400 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3401
3402 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3403
3404 if (scsi3) {
3405 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3406 if (needs_format && size == 0) {
3407 /* No need to write the mode page when clearing
3408 * partitioning
3409 */
3410 DEBC_printk(STp, "Formatting tape with one partition.\n");
3411 result = format_medium(STp, 0);
3412 goto out;
3413 }
3414 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3415 psd_cnt = 2;
3416 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3417 /* Use units scaling for large partitions if the device
3418 * suggests it and no precision lost. Required for IBM
3419 * TS1140/50 drives that don't support MB units.
3420 */
3421 if (size >= 1000 && (size % 1000) == 0) {
3422 size /= 1000;
3423 psum = PP_MSK_PSUM_UNITS;
3424 units = 9; /* GB */
3425 }
3426 }
3427 /* Try it anyway if too large to specify in MB */
3428 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3429 size /= 1000;
3430 psum = PP_MSK_PSUM_UNITS;
3431 units = 9; /* GB */
3432 }
3433 }
3434
3435 if (size >= 65535 || /* Does not fit into two bytes */
3436 (target_partition == 0 && psd_cnt < 2)) {
3437 result = -EINVAL;
3438 goto out;
3439 }
3440
1da177e4 3441 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3442 /* The second condition is for HP DDS which use only one partition size
3443 * descriptor
3444 */
3445 if (target_partition > 0 &&
3446 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3447 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3448 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3449 psdo += 2;
3450 }
3451 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3452
b30d8bca 3453 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3454 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3455 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3456
8038e645 3457 if (size == 0) {
1da177e4
LT		 3458 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3459 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3460 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3461 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3462 } else {
3463 bp[psdo] = (size >> 8) & 0xff;
3464 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3465 if (target_partition == 0)
3466 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3467 bp[pgo + 3] = 1;
3468 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3469 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3470 DEBC_printk(STp,
3471 "Formatting tape with two partitions (%i = %d MB).\n",
3472 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3473 }
3474 bp[pgo + PP_OFF_PART_UNITS] = 0;
3475 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3476 if (size != 1 || units != 0) {
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3479 bp[pgo + PP_OFF_PART_UNITS] = units;
3480 } else
3481 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3482 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3483 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3484
3485 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3486
3487 if (!result && needs_format)
3488 result = format_medium(STp, 1);
3489
1da177e4 3490 if (result) {
b30d8bca 3491 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3492 result = (-EIO);
3493 }
3494
8038e645 3495out:
1da177e4
LT		 3496 return result;
3497}
3498\f
3499
3500
3501/* The ioctl command */
fd66c1b4 3502static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 3503{
3504 int i, cmd_nr, cmd_type, bt;
3505 int retval = 0;
3506 unsigned int blk;
3507 struct scsi_tape *STp = file->private_data;
3508 struct st_modedef *STm;
3509 struct st_partstat *STps;
1da177e4
LT		 3510 void __user *p = (void __user *)arg;
3511
28f85009 3512 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3513 return -ERESTARTSYS;
3514
b30d8bca 3515 DEB(
1da177e4 3516 if (debugging && !STp->in_use) {
b30d8bca 3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3518 retval = (-EIO);
3519 goto out;
3520 } ) /* end DEB */
3521
3522 STm = &(STp->modes[STp->current_mode]);
3523 STps = &(STp->ps[STp->partition]);
3524
3525 /*
3526 * If we are in the middle of error recovery, don't let anyone
3527 * else try and use this device. Also, if error recovery fails, it
3528 * may try and take the device offline, in which case all further
3529 * access to the device is prohibited.
3530 */
906d15fb
CH		 3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3532 file->f_flags & O_NDELAY);
3533 if (retval)
1da177e4 3534 goto out;
1da177e4
LT		 3535
3536 cmd_type = _IOC_TYPE(cmd_in);
3537 cmd_nr = _IOC_NR(cmd_in);
3538
3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3540 struct mtop mtc;
3541
3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3543 retval = (-EINVAL);
3544 goto out;
3545 }
3546
3547 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3548 if (i) {
3549 retval = (-EFAULT);
3550 goto out;
3551 }
3552
3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3554 st_printk(KERN_WARNING, STp,
3555 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3556 retval = (-EPERM);
3557 goto out;
3558 }
3559 if (!STm->defined &&
3560 (mtc.mt_op != MTSETDRVBUFFER &&
3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3562 retval = (-ENXIO);
3563 goto out;
3564 }
3565
3566 if (!STp->pos_unknown) {
3567
3568 if (STps->eof == ST_FM_HIT) {
3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3570 mtc.mt_op == MTEOM) {
3571 mtc.mt_count -= 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3575 mtc.mt_count += 1;
3576 if (STps->drv_file >= 0)
3577 STps->drv_file += 1;
3578 }
3579 }
3580
3581 if (mtc.mt_op == MTSEEK) {
3582 /* Old position must be restored if partition will be
3583 changed */
3584 i = !STp->can_partitions ||
3585 (STp->new_partition != STp->partition);
3586 } else {
3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3592 mtc.mt_op == MTCOMPRESSION;
3593 }
3594 i = flush_buffer(STp, i);
3595 if (i < 0) {
3596 retval = i;
3597 goto out;
3598 }
3599 if (STps->rw == ST_WRITING &&
3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3601 mtc.mt_op == MTSEEK ||
3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3603 i = st_int_ioctl(STp, MTWEOF, 1);
3604 if (i < 0) {
3605 retval = i;
3606 goto out;
3607 }
3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3609 mtc.mt_count++;
3610 STps->rw = ST_IDLE;
3611 }
3612
3613 } else {
3614 /*
3615 * If there was a bus reset, block further access
3616 * to this device. If the user wants to rewind the tape,
3617 * then reset the flag and allow access again.
3618 */
3619 if (mtc.mt_op != MTREW &&
3620 mtc.mt_op != MTOFFL &&
3621 mtc.mt_op != MTRETEN &&
3622 mtc.mt_op != MTERASE &&
3623 mtc.mt_op != MTSEEK &&
3624 mtc.mt_op != MTEOM) {
3625 retval = (-EIO);
3626 goto out;
3627 }
3628 reset_state(STp);
3629 /* remove this when the midlevel properly clears was_reset */
3630 STp->device->was_reset = 0;
3631 }
3632
3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3637
3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3639 do_door_lock(STp, 0); /* Ignore result! */
3640
3641 if (mtc.mt_op == MTSETDRVBUFFER &&
3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3643 retval = st_set_options(STp, mtc.mt_count);
3644 goto out;
3645 }
3646
3647 if (mtc.mt_op == MTSETPART) {
3648 if (!STp->can_partitions ||
3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3650 retval = (-EINVAL);
3651 goto out;
3652 }
3653 if (mtc.mt_count >= STp->nbr_partitions &&
3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3655 retval = (-EIO);
3656 goto out;
3657 }
3658 if (mtc.mt_count >= STp->nbr_partitions) {
3659 retval = (-EINVAL);
3660 goto out;
3661 }
3662 STp->new_partition = mtc.mt_count;
3663 retval = 0;
3664 goto out;
3665 }
3666
3667 if (mtc.mt_op == MTMKPART) {
3668 if (!STp->can_partitions) {
3669 retval = (-EINVAL);
3670 goto out;
3671 }
8038e645
KM		 3672 i = do_load_unload(STp, file, 1);
3673 if (i < 0) {
3674 retval = i;
3675 goto out;
3676 }
3677 i = partition_tape(STp, mtc.mt_count);
3678 if (i < 0) {
1da177e4
LT		 3679 retval = i;
3680 goto out;
3681 }
3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3683 STp->ps[i].rw = ST_IDLE;
3684 STp->ps[i].at_sm = 0;
3685 STp->ps[i].last_block_valid = 0;
3686 }
3687 STp->partition = STp->new_partition = 0;
8038e645 3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3689 STps->drv_block = STps->drv_file = 0;
3690 retval = 0;
3691 goto out;
3692 }
3693
3694 if (mtc.mt_op == MTSEEK) {
3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3696 if (!STp->can_partitions)
3697 STp->ps[0].rw = ST_IDLE;
3698 retval = i;
3699 goto out;
3700 }
3701
3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3703 retval = do_load_unload(STp, file, 0);
3704 goto out;
3705 }
3706
3707 if (mtc.mt_op == MTLOAD) {
3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3709 goto out;
3710 }
3711
3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3714 goto out;
3715 }
3716
3717 if (STp->can_partitions && STp->ready == ST_READY &&
3718 (i = switch_partition(STp)) < 0) {
3719 retval = i;
3720 goto out;
3721 }
3722
3723 if (mtc.mt_op == MTCOMPRESSION)
3724 retval = st_compression(STp, (mtc.mt_count & 1));
3725 else
3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3727 goto out;
3728 }
3729 if (!STm->defined) {
3730 retval = (-ENXIO);
3731 goto out;
3732 }
3733
3734 if ((i = flush_buffer(STp, 0)) < 0) {
3735 retval = i;
3736 goto out;
3737 }
3738 if (STp->can_partitions &&
3739 (i = switch_partition(STp)) < 0) {
3740 retval = i;
3741 goto out;
3742 }
3743
3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3745 struct mtget mt_status;
3746
3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3748 retval = (-EINVAL);
3749 goto out;
3750 }
3751
3752 mt_status.mt_type = STp->tape_type;
3753 mt_status.mt_dsreg =
3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3756 mt_status.mt_blkno = STps->drv_block;
3757 mt_status.mt_fileno = STps->drv_file;
3758 if (STp->block_size != 0) {
3759 if (STps->rw == ST_WRITING)
3760 mt_status.mt_blkno +=
3761 (STp->buffer)->buffer_bytes / STp->block_size;
3762 else if (STps->rw == ST_READING)
3763 mt_status.mt_blkno -=
3764 ((STp->buffer)->buffer_bytes +
3765 STp->block_size - 1) / STp->block_size;
3766 }
3767
3768 mt_status.mt_gstat = 0;
3769 if (STp->drv_write_prot)
3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3771 if (mt_status.mt_blkno == 0) {
3772 if (mt_status.mt_fileno == 0)
3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3774 else
3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3776 }
3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3778 mt_status.mt_resid = STp->partition;
3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3781 else if (STps->eof >= ST_EOM_OK)
3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3783 if (STp->density == 1)
3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3785 else if (STp->density == 2)
3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3787 else if (STp->density == 3)
3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3789 if (STp->ready == ST_READY)
3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3791 if (STp->ready == ST_NO_TAPE)
3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3793 if (STps->at_sm)
3794 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3795 if (STm->do_async_writes ||
3796 (STm->do_buffer_writes && STp->block_size != 0) ||
3797 STp->drv_buffer != 0)
3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3799 if (STp->cleaning_req)
3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3801
3802 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3803 if (i) {
3804 retval = (-EFAULT);
3805 goto out;
3806 }
3807
3808 STp->recover_reg = 0; /* Clear after read */
3809 retval = 0;
3810 goto out;
3811 } /* End of MTIOCGET */
3812 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3813 struct mtpos mt_pos;
3814 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3815 retval = (-EINVAL);
3816 goto out;
3817 }
3818 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3819 retval = i;
3820 goto out;
3821 }
3822 mt_pos.mt_blkno = blk;
3823 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3824 if (i)
3825 retval = (-EFAULT);
3826 goto out;
3827 }
28f85009 3828 mutex_unlock(&STp->lock);
1da177e4
LT		 3829 switch (cmd_in) {
3830 case SCSI_IOCTL_GET_IDLUN:
3831 case SCSI_IOCTL_GET_BUS_NUMBER:
3832 break;
3833 default:
16c4b3e2
KM		 3834 if ((cmd_in == SG_IO ||
3835 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3836 cmd_in == CDROM_SEND_PACKET) &&
3837 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3838 i = -EPERM;
3839 else
74f3c8af
AV		 3840 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3841 file->f_mode, cmd_in, p);
1da177e4
LT		 3842 if (i != -ENOTTY)
3843 return i;
3844 break;
3845 }
16c4b3e2
KM		 3846 retval = scsi_ioctl(STp->device, cmd_in, p);
3847 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3848 STp->rew_at_close = 0;
3849 STp->ready = ST_NO_TAPE;
3850 }
3851 return retval;
1da177e4
LT		 3852
3853 out:
28f85009 3854 mutex_unlock(&STp->lock);
1da177e4
LT		 3855 return retval;
3856}
3857
3858#ifdef CONFIG_COMPAT
3859static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3860{
3861 struct scsi_tape *STp = file->private_data;
3862 struct scsi_device *sdev = STp->device;
3863 int ret = -ENOIOCTLCMD;
3864 if (sdev->host->hostt->compat_ioctl) {
3865
3866 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3867
3868 }
3869 return ret;
3870}
3871#endif
3872
3873\f
3874
3875/* Try to allocate a new tape buffer. Calling function must not hold
3876 dev_arr_lock. */
f409d6cc 3877static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
1da177e4 3878{
1da177e4
LT		 3879 struct st_buffer *tb;
3880
f409d6cc 3881 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
1da177e4
LT		 3882 if (!tb) {
3883 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3884 return NULL;
3885 }
1ac63cf5 3886 tb->frp_segs = 0;
1da177e4 3887 tb->use_sg = max_sg;
1da177e4 3888 tb->dma = need_dma;
f409d6cc 3889 tb->buffer_size = 0;
1da177e4 3890
f409d6cc
FT		 3891 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3892 GFP_ATOMIC);
d0e1ae31
FT		 3893 if (!tb->reserved_pages) {
3894 kfree(tb);
3895 return NULL;
3896 }
3897
1da177e4
LT		 3898 return tb;
3899}
3900
3901
3902/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3903#define ST_MAX_ORDER 6
3904
1da177e4
LT		 3905static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3906{
769989a4 3907 int segs, max_segs, b_size, order, got;
c53033f6 3908 gfp_t priority;
1da177e4
LT		 3909
3910 if (new_size <= STbuffer->buffer_size)
3911 return 1;
3912
3913 if (STbuffer->buffer_size <= PAGE_SIZE)
3914 normalize_buffer(STbuffer); /* Avoid extra segment */
3915
3916 max_segs = STbuffer->use_sg;
1da177e4
LT		 3917
3918 priority = GFP_KERNEL | __GFP_NOWARN;
3919 if (need_dma)
3920 priority |= GFP_DMA;
9c905966 3921
08c95832
FT		 3922 if (STbuffer->cleared)
3923 priority |= __GFP_ZERO;
3924
9c905966 3925 if (STbuffer->frp_segs) {
c982c368 3926 order = STbuffer->reserved_page_order;
08c95832 3927 b_size = PAGE_SIZE << order;
9c905966
FT		 3928 } else {
3929 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3930 order < ST_MAX_ORDER &&
3931 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3932 order++, b_size *= 2)
9c905966 3933 ; /* empty */
373daacf 3934 STbuffer->reserved_page_order = order;
9c905966 3935 }
8f78fc5e
KM		 3936 if (max_segs * (PAGE_SIZE << order) < new_size) {
3937 if (order == ST_MAX_ORDER)
3938 return 0;
3939 normalize_buffer(STbuffer);
3940 return enlarge_buffer(STbuffer, new_size, need_dma);
3941 }
1da177e4
LT		 3942
3943 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3944 segs < max_segs && got < new_size;) {
08c95832
FT		 3945 struct page *page;
3946
3947 page = alloc_pages(priority, order);
3948 if (!page) {
1da177e4
LT		 3949 DEB(STbuffer->buffer_size = got);
3950 normalize_buffer(STbuffer);
3951 return 0;
3952 }
08c95832 3953
1da177e4
LT		 3954 STbuffer->frp_segs += 1;
3955 got += b_size;
3956 STbuffer->buffer_size = got;
08c95832 3957 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3958 segs++;
3959 }
08c95832 3960 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3961
3962 return 1;
3963}
3964
3965
40f6b36c
KM		 3966/* Make sure that no data from previous user is in the internal buffer */
3967static void clear_buffer(struct st_buffer * st_bp)
3968{
3969 int i;
3970
3971 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3972 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3973 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3974 st_bp->cleared = 1;
3975}
3976
3977
1da177e4
LT		 3978/* Release the extra buffer */
3979static void normalize_buffer(struct st_buffer * STbuffer)
3980{
c982c368 3981 int i, order = STbuffer->reserved_page_order;
1da177e4 3982
1ac63cf5 3983 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3984 __free_pages(STbuffer->reserved_pages[i], order);
3985 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3986 }
1ac63cf5 3987 STbuffer->frp_segs = 0;
8b05b773 3988 STbuffer->sg_segs = 0;
c982c368 3989 STbuffer->reserved_page_order = 0;
d0e1ae31 3990 STbuffer->map_data.offset = 0;
1da177e4
LT		 3991}
3992
3993
3994/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3995 negative error code. */
3996static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3997{
3998 int i, cnt, res, offset;
c982c368 3999 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4000
4001 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 4002 i < st_bp->frp_segs && offset >= length; i++)
4003 offset -= length;
1da177e4
LT		 4004 if (i == st_bp->frp_segs) { /* Should never happen */
4005 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4006 return (-EIO);
4007 }
4008 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4009 struct page *page = st_bp->reserved_pages[i];
4010 cnt = length - offset < do_count ? length - offset : do_count;
4011 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4012 if (res)
4013 return (-EFAULT);
4014 do_count -= cnt;
4015 st_bp->buffer_bytes += cnt;
4016 ubp += cnt;
4017 offset = 0;
4018 }
4019 if (do_count) /* Should never happen */
4020 return (-EIO);
4021
4022 return 0;
4023}
4024
4025
4026/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4027 negative error code. */
4028static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4029{
4030 int i, cnt, res, offset;
c982c368 4031 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4032
4033 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4034 i < st_bp->frp_segs && offset >= length; i++)
4035 offset -= length;
1da177e4
LT		 4036 if (i == st_bp->frp_segs) { /* Should never happen */
4037 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4038 return (-EIO);
4039 }
4040 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4041 struct page *page = st_bp->reserved_pages[i];
4042 cnt = length - offset < do_count ? length - offset : do_count;
4043 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4044 if (res)
4045 return (-EFAULT);
4046 do_count -= cnt;
4047 st_bp->buffer_bytes -= cnt;
4048 st_bp->read_pointer += cnt;
4049 ubp += cnt;
4050 offset = 0;
4051 }
4052 if (do_count) /* Should never happen */
4053 return (-EIO);
4054
4055 return 0;
4056}
4057
4058
4059/* Move data towards start of buffer */
4060static void move_buffer_data(struct st_buffer * st_bp, int offset)
4061{
4062 int src_seg, dst_seg, src_offset = 0, dst_offset;
4063 int count, total;
c982c368 4064 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4065
4066 if (offset == 0)
4067 return;
4068
4069 total=st_bp->buffer_bytes - offset;
4070 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4071 src_offset = offset;
08c95832 4072 if (src_offset < length)
1da177e4 4073 break;
08c95832 4074 offset -= length;
1da177e4
LT		 4075 }
4076
4077 st_bp->buffer_bytes = st_bp->read_pointer = total;
4078 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4079 struct page *dpage = st_bp->reserved_pages[dst_seg];
4080 struct page *spage = st_bp->reserved_pages[src_seg];
4081
4082 count = min(length - dst_offset, length - src_offset);
4083 memmove(page_address(dpage) + dst_offset,
4084 page_address(spage) + src_offset, count);
1da177e4 4085 src_offset += count;
08c95832 4086 if (src_offset >= length) {
1da177e4
LT		 4087 src_seg++;
4088 src_offset = 0;
4089 }
4090 dst_offset += count;
08c95832 4091 if (dst_offset >= length) {
1da177e4
LT		 4092 dst_seg++;
4093 dst_offset = 0;
4094 }
4095 total -= count;
4096 }
4097}
4098
1da177e4
LT		 4099/* Validate the options from command line or module parameters */
4100static void validate_options(void)
4101{
4102 if (buffer_kbs > 0)
4103 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4104 if (max_sg_segs >= ST_FIRST_SG)
4105 st_max_sg_segs = max_sg_segs;
4106}
4107
4108#ifndef MODULE
4109/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4110 */
4111static int __init st_setup(char *str)
4112{
4113 int i, len, ints[5];
4114 char *stp;
4115
4116 stp = get_options(str, ARRAY_SIZE(ints), ints);
4117
4118 if (ints[0] > 0) {
4119 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4120 if (parms[i].val)
4121 *parms[i].val = ints[i + 1];
4122 } else {
4123 while (stp != NULL) {
4124 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4125 len = strlen(parms[i].name);
4126 if (!strncmp(stp, parms[i].name, len) &&
4127 (*(stp + len) == ':' || *(stp + len) == '=')) {
4128 if (parms[i].val)
4129 *parms[i].val =
4130 simple_strtoul(stp + len + 1, NULL, 0);
4131 else
4132 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4133 parms[i].name);
4134 break;
4135 }
4136 }
6391a113 4137 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4138 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4139 stp);
4140 stp = strchr(stp, ',');
4141 if (stp)
4142 stp++;
4143 }
4144 }
4145
4146 validate_options();
4147
4148 return 1;
4149}
4150
4151__setup("st=", st_setup);
4152
4153#endif
4154
00977a59 4155static const struct file_operations st_fops =
1da177e4
LT		 4156{
4157 .owner = THIS_MODULE,
4158 .read = st_read,
4159 .write = st_write,
fd66c1b4 4160 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4161#ifdef CONFIG_COMPAT
4162 .compat_ioctl = st_compat_ioctl,
4163#endif
4164 .open = st_open,
4165 .flush = st_flush,
4166 .release = st_release,
b4d878e2 4167 .llseek = noop_llseek,
1da177e4
LT		 4168};
4169
26898afd
JM		 4170static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4171{
4172 int i, error;
4173 dev_t cdev_devno;
4174 struct cdev *cdev;
4175 struct device *dev;
4176 struct st_modedef *STm = &(tape->modes[mode]);
4177 char name[10];
4178 int dev_num = tape->index;
4179
4180 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4181
4182 cdev = cdev_alloc();
4183 if (!cdev) {
4184 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4185 error = -ENOMEM;
4186 goto out;
4187 }
4188 cdev->owner = THIS_MODULE;
4189 cdev->ops = &st_fops;
ab08ee14 4190 STm->cdevs[rew] = cdev;
26898afd
JM		 4191
4192 error = cdev_add(cdev, cdev_devno, 1);
4193 if (error) {
4194 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4195 rew ? "non" : "auto", mode);
4196 pr_err("st%d: Device not attached.\n", dev_num);
4197 goto out_free;
4198 }
26898afd
JM		 4199
4200 i = mode << (4 - ST_NBR_MODE_BITS);
4201 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4202 tape->disk->disk_name, st_formats[i]);
4203
4204 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4205 cdev_devno, &tape->modes[mode], "%s", name);
4206 if (IS_ERR(dev)) {
4207 pr_err("st%d: device_create failed\n", dev_num);
4208 error = PTR_ERR(dev);
4209 goto out_free;
4210 }
4211
4212 STm->devs[rew] = dev;
4213
4214 return 0;
4215out_free:
4216 cdev_del(STm->cdevs[rew]);
26898afd 4217out:
ab08ee14
ML		 4218 STm->cdevs[rew] = NULL;
4219 STm->devs[rew] = NULL;
26898afd
JM		 4220 return error;
4221}
4222
4223static int create_cdevs(struct scsi_tape *tape)
4224{
4225 int mode, error;
4226 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4227 error = create_one_cdev(tape, mode, 0);
4228 if (error)
4229 return error;
4230 error = create_one_cdev(tape, mode, 1);
4231 if (error)
4232 return error;
4233 }
4234
4235 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4236 &tape->modes[0].devs[0]->kobj, "tape");
4237}
4238
4239static void remove_cdevs(struct scsi_tape *tape)
4240{
4241 int mode, rew;
4242 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4243 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4244 struct st_modedef *STm = &(tape->modes[mode]);
4245 for (rew = 0; rew < 2; rew++) {
4246 if (STm->cdevs[rew])
4247 cdev_del(STm->cdevs[rew]);
4248 if (STm->devs[rew])
4249 device_unregister(STm->devs[rew]);
4250 }
4251 }
4252}
4253
1da177e4
LT		 4254static int st_probe(struct device *dev)
4255{
4256 struct scsi_device *SDp = to_scsi_device(dev);
4257 struct gendisk *disk = NULL;
1da177e4
LT		 4258 struct scsi_tape *tpnt = NULL;
4259 struct st_modedef *STm;
4260 struct st_partstat *STps;
4261 struct st_buffer *buffer;
b98c52b5 4262 int i, error;
1da177e4 4263 char *stp;
1da177e4
LT		 4264
4265 if (SDp->type != TYPE_TAPE)
4266 return -ENODEV;
4267 if ((stp = st_incompatible(SDp))) {
3bf743e7 4268 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
b30d8bca
HR		 4269 sdev_printk(KERN_INFO, SDp,
4270 "st: The suggested driver is %s.\n", stp);
1da177e4
LT		 4271 return -ENODEV;
4272 }
4273
6fe8c1db 4274 scsi_autopm_get_device(SDp);
8a78362c 4275 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4276 if (st_max_sg_segs < i)
4277 i = st_max_sg_segs;
f409d6cc 4278 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
1da177e4 4279 if (buffer == NULL) {
b30d8bca
HR		 4280 sdev_printk(KERN_ERR, SDp,
4281 "st: Can't allocate new tape buffer. "
4282 "Device not attached.\n");
1da177e4
LT		 4283 goto out;
4284 }
4285
4286 disk = alloc_disk(1);
4287 if (!disk) {
b30d8bca
HR		 4288 sdev_printk(KERN_ERR, SDp,
4289 "st: out of memory. Device not attached.\n");
1da177e4
LT		 4290 goto out_buffer_free;
4291 }
4292
24669f75 4293 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
1da177e4 4294 if (tpnt == NULL) {
b30d8bca
HR		 4295 sdev_printk(KERN_ERR, SDp,
4296 "st: Can't allocate device descriptor.\n");
1da177e4
LT		 4297 goto out_put_disk;
4298 }
f03a5670 4299 kref_init(&tpnt->kref);
1da177e4 4300 tpnt->disk = disk;
1da177e4 4301 disk->private_data = &tpnt->driver;
2b5bebcc
JL		 4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4303 * take queue reference that release_disk() expects. */
180efde0 4304 if (!blk_get_queue(SDp->request_queue))
2b5bebcc 4305 goto out_put_disk;
180efde0 4306 disk->queue = SDp->request_queue;
1da177e4 4307 tpnt->driver = &st_template;
1da177e4
LT		 4308
4309 tpnt->device = SDp;
4310 if (SDp->scsi_level <= 2)
4311 tpnt->tape_type = MT_ISSCSI1;
4312 else
4313 tpnt->tape_type = MT_ISSCSI2;
4314
4315 tpnt->buffer = buffer;
f03a5670 4316 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4317
4318 tpnt->inited = 0;
4319 tpnt->dirty = 0;
4320 tpnt->in_use = 0;
4321 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4322 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4323 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4324 tpnt->density = 0;
4325 tpnt->do_auto_lock = ST_AUTO_LOCK;
4326 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4327 tpnt->can_partitions = 0;
4328 tpnt->two_fm = ST_TWO_FM;
4329 tpnt->fast_mteom = ST_FAST_MTEOM;
4330 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4331 tpnt->sili = ST_SILI;
1da177e4 4332 tpnt->immediate = ST_NOWAIT;
c743e44f 4333 tpnt->immediate_filemark = 0;
1da177e4
LT		 4334 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4335 tpnt->partition = 0;
4336 tpnt->new_partition = 0;
4337 tpnt->nbr_partitions = 0;
a02488ed 4338 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4339 tpnt->long_timeout = ST_LONG_TIMEOUT;
4340 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4341
1da177e4
LT		 4342 for (i = 0; i < ST_NBR_MODES; i++) {
4343 STm = &(tpnt->modes[i]);
4344 STm->defined = 0;
4345 STm->sysv = ST_SYSV;
4346 STm->defaults_for_writes = 0;
4347 STm->do_async_writes = ST_ASYNC_WRITES;
4348 STm->do_buffer_writes = ST_BUFFER_WRITES;
4349 STm->do_read_ahead = ST_READ_AHEAD;
4350 STm->default_compression = ST_DONT_TOUCH;
4351 STm->default_blksize = (-1); /* No forced size */
4352 STm->default_density = (-1); /* No forced density */
6c648d95 4353 STm->tape = tpnt;
1da177e4
LT		 4354 }
4355
4356 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4357 STps = &(tpnt->ps[i]);
4358 STps->rw = ST_IDLE;
4359 STps->eof = ST_NOEOF;
4360 STps->at_sm = 0;
4361 STps->last_block_valid = 0;
4362 STps->drv_block = (-1);
4363 STps->drv_file = (-1);
4364 }
4365
4366 tpnt->current_mode = 0;
4367 tpnt->modes[0].defined = 1;
4368
4369 tpnt->density_changed = tpnt->compression_changed =
4370 tpnt->blksize_changed = 0;
28f85009 4371 mutex_init(&tpnt->lock);
1da177e4 4372
b98c52b5 4373 idr_preload(GFP_KERNEL);
6c648d95 4374 spin_lock(&st_index_lock);
b98c52b5 4375 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4376 spin_unlock(&st_index_lock);
b98c52b5
TH		 4377 idr_preload_end();
4378 if (error < 0) {
6c648d95 4379 pr_warn("st: idr allocation failed: %d\n", error);
2b5bebcc 4380 goto out_put_queue;
6c648d95 4381 }
b98c52b5
TH		 4382 tpnt->index = error;
4383 sprintf(disk->disk_name, "st%d", tpnt->index);
05545c92
SS		 4384 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4385 if (tpnt->stats == NULL) {
4386 sdev_printk(KERN_ERR, SDp,
4387 "st: Can't allocate statistics.\n");
4388 goto out_idr_remove;
4389 }
6c648d95
JM		 4390
4391 dev_set_drvdata(dev, tpnt);
1da177e4 4392
1da177e4 4393
26898afd
JM		 4394 error = create_cdevs(tpnt);
4395 if (error)
4396 goto out_remove_devs;
46a243f7 4397 scsi_autopm_put_device(SDp);
1da177e4 4398
42252854 4399 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4400 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4401 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4402 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4403 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4404
4405 return 0;
4406
26898afd
JM		 4407out_remove_devs:
4408 remove_cdevs(tpnt);
05545c92
SS		 4409 kfree(tpnt->stats);
4410out_idr_remove:
6c648d95 4411 spin_lock(&st_index_lock);
b98c52b5 4412 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4413 spin_unlock(&st_index_lock);
2b5bebcc
JL		 4414out_put_queue:
4415 blk_put_queue(disk->queue);
1da177e4
LT		 4416out_put_disk:
4417 put_disk(disk);
c9475cb0 4418 kfree(tpnt);
1da177e4
LT		 4419out_buffer_free:
4420 kfree(buffer);
4421out:
6fe8c1db 4422 scsi_autopm_put_device(SDp);
1da177e4
LT		 4423 return -ENODEV;
4424};
4425
4426
4427static int st_remove(struct device *dev)
4428{
6c648d95 4429 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4430 int index = tpnt->index;
4431
4432 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4433 remove_cdevs(tpnt);
1da177e4 4434
6c648d95
JM		 4435 mutex_lock(&st_ref_mutex);
4436 kref_put(&tpnt->kref, scsi_tape_release);
4437 mutex_unlock(&st_ref_mutex);
4438 spin_lock(&st_index_lock);
4439 idr_remove(&st_index_idr, index);
4440 spin_unlock(&st_index_lock);
1da177e4
LT		 4441 return 0;
4442}
4443
f03a5670
KM		 4444/**
4445 * scsi_tape_release - Called to free the Scsi_Tape structure
4446 * @kref: pointer to embedded kref
4447 *
0b950672 4448 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4449 * called on last put, you should always use the scsi_tape_get()
4450 * scsi_tape_put() helpers which manipulate the semaphore directly
4451 * and never do a direct kref_put().
4452 **/
4453static void scsi_tape_release(struct kref *kref)
4454{
4455 struct scsi_tape *tpnt = to_scsi_tape(kref);
4456 struct gendisk *disk = tpnt->disk;
4457
4458 tpnt->device = NULL;
4459
4460 if (tpnt->buffer) {
f03a5670 4461 normalize_buffer(tpnt->buffer);
d0e1ae31 4462 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4463 kfree(tpnt->buffer);
4464 }
4465
4466 disk->private_data = NULL;
4467 put_disk(disk);
05545c92 4468 kfree(tpnt->stats);
f03a5670
KM		 4469 kfree(tpnt);
4470 return;
4471}
4472
af23782b
JM		 4473static struct class st_sysfs_class = {
4474 .name = "scsi_tape",
c69c6be5 4475 .dev_groups = st_dev_groups,
af23782b
JM		 4476};
4477
1da177e4
LT		 4478static int __init init_st(void)
4479{
13026a6b
JG		 4480 int err;
4481
1da177e4
LT		 4482 validate_options();
4483
13026a6b 4484 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4485 verstr, st_fixed_buffer_size, st_max_sg_segs);
4486
2bec708a
LO		 4487 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4488 if (debugging) {
4489 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4490 debugging);
4491 }
4492
af23782b
JM		 4493 err = class_register(&st_sysfs_class);
4494 if (err) {
4495 pr_err("Unable register sysfs class for SCSI tapes\n");
4496 return err;
1da177e4
LT		 4497 }
4498
13026a6b
JG		 4499 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4500 ST_MAX_TAPE_ENTRIES, "st");
4501 if (err) {
4502 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4503 SCSI_TAPE_MAJOR);
4504 goto err_class;
1da177e4
LT		 4505 }
4506
13026a6b
JG		 4507 err = scsi_register_driver(&st_template.gendrv);
4508 if (err)
4509 goto err_chrdev;
4510
13026a6b
JG		 4511 return 0;
4512
13026a6b
JG		 4513err_chrdev:
4514 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4515 ST_MAX_TAPE_ENTRIES);
4516err_class:
af23782b 4517 class_unregister(&st_sysfs_class);
13026a6b 4518 return err;
1da177e4
LT		 4519}
4520
4521static void __exit exit_st(void)
4522{
1da177e4
LT		 4523 scsi_unregister_driver(&st_template.gendrv);
4524 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4525 ST_MAX_TAPE_ENTRIES);
af23782b 4526 class_unregister(&st_sysfs_class);
2d3a5d21 4527 idr_destroy(&st_index_idr);
1da177e4
LT		 4528 printk(KERN_INFO "st: Unloaded.\n");
4529}
4530
4531module_init(init_st);
4532module_exit(exit_st);
4533
4534
4535/* The sysfs driver interface. Read-only at the moment */
10978e48 4536static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4537{
10978e48 4538 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4539}
10978e48 4540static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4541
10978e48 4542static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4543{
10978e48 4544 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4545}
10978e48 4546static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4547
10978e48 4548static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4549{
10978e48 4550 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4551}
10978e48 4552static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4553
10978e48 4554static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4555{
10978e48 4556 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4557}
10978e48 4558static DRIVER_ATTR_RO(version);
1da177e4 4559
d9b43a10
SS		 4560#if DEBUG
4561static ssize_t debug_flag_store(struct device_driver *ddp,
4562 const char *buf, size_t count)
4563{
4564/* We only care what the first byte of the data is the rest is unused.
4565 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4566 * other values have -EINVAL returned if they are passed in.
4567 */
4568 if (count > 0) {
4569 if (buf[0] == '0') {
4570 debugging = NO_DEBUG;
4571 return count;
4572 } else if (buf[0] == '1') {
4573 debugging = 1;
4574 return count;
4575 }
4576 }
4577 return -EINVAL;
4578}
4579
4580static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4581{
4582 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4583}
4584static DRIVER_ATTR_RW(debug_flag);
4585#endif
4586
442d7562
SS		 4587static struct attribute *st_drv_attrs[] = {
4588 &driver_attr_try_direct_io.attr,
4589 &driver_attr_fixed_buffer_size.attr,
4590 &driver_attr_max_sg_segs.attr,
4591 &driver_attr_version.attr,
d9b43a10
SS		 4592#if DEBUG
4593 &driver_attr_debug_flag.attr,
4594#endif
442d7562
SS		 4595 NULL,
4596};
4597ATTRIBUTE_GROUPS(st_drv);
1da177e4 4598
1da177e4 4599/* The sysfs simple class interface */
ee959b00 4600static ssize_t
af23782b 4601defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4602{
7d15d6a4 4603 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4604 ssize_t l = 0;
4605
4606 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4607 return l;
4608}
c69c6be5 4609static DEVICE_ATTR_RO(defined);
1da177e4 4610
ee959b00 4611static ssize_t
af23782b
JM		 4612default_blksize_show(struct device *dev, struct device_attribute *attr,
4613 char *buf)
1da177e4 4614{
7d15d6a4 4615 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4616 ssize_t l = 0;
4617
4618 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4619 return l;
4620}
c69c6be5 4621static DEVICE_ATTR_RO(default_blksize);
1da177e4 4622
ee959b00 4623static ssize_t
af23782b
JM		 4624default_density_show(struct device *dev, struct device_attribute *attr,
4625 char *buf)
1da177e4 4626{
7d15d6a4 4627 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4628 ssize_t l = 0;
4629 char *fmt;
4630
4631 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4632 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4633 return l;
4634}
c69c6be5 4635static DEVICE_ATTR_RO(default_density);
1da177e4 4636
ee959b00 4637static ssize_t
af23782b
JM		 4638default_compression_show(struct device *dev, struct device_attribute *attr,
4639 char *buf)
1da177e4 4640{
7d15d6a4 4641 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4642 ssize_t l = 0;
4643
4644 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4645 return l;
4646}
c69c6be5 4647static DEVICE_ATTR_RO(default_compression);
1da177e4 4648
ee959b00 4649static ssize_t
af23782b 4650options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4651{
7d15d6a4 4652 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4653 struct scsi_tape *STp = STm->tape;
4654 int options;
b174be02
KM		 4655 ssize_t l = 0;
4656
b174be02
KM		 4657 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4658 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4659 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4660 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4661 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4662 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4663 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4664 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4665 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4666 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4667 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4668 options |= STm->sysv ? MT_ST_SYSV : 0;
4669 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4670 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4671 options |= STp->sili ? MT_ST_SILI : 0;
4672
4673 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4674 return l;
4675}
c69c6be5
GKH		 4676static DEVICE_ATTR_RO(options);
4677
05545c92
SS		 4678/* Support for tape stats */
4679
4680/**
4681 * read_cnt_show - return read count - count of reads made from tape drive
4682 * @dev: struct device
4683 * @attr: attribute structure
4684 * @buf: buffer to return formatted data in
4685 */
4686static ssize_t read_cnt_show(struct device *dev,
4687 struct device_attribute *attr, char *buf)
4688{
4689 struct st_modedef *STm = dev_get_drvdata(dev);
4690
4691 return sprintf(buf, "%lld",
4692 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4693}
4694static DEVICE_ATTR_RO(read_cnt);
4695
4696/**
4697 * read_byte_cnt_show - return read byte count - tape drives
4698 * may use blocks less than 512 bytes this gives the raw byte count of
4699 * of data read from the tape drive.
4700 * @dev: struct device
4701 * @attr: attribute structure
4702 * @buf: buffer to return formatted data in
4703 */
4704static ssize_t read_byte_cnt_show(struct device *dev,
4705 struct device_attribute *attr, char *buf)
4706{
4707 struct st_modedef *STm = dev_get_drvdata(dev);
4708
4709 return sprintf(buf, "%lld",
4710 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4711}
4712static DEVICE_ATTR_RO(read_byte_cnt);
4713
4714/**
4715 * read_us_show - return read us - overall time spent waiting on reads in ns.
4716 * @dev: struct device
4717 * @attr: attribute structure
4718 * @buf: buffer to return formatted data in
4719 */
4720static ssize_t read_ns_show(struct device *dev,
4721 struct device_attribute *attr, char *buf)
4722{
4723 struct st_modedef *STm = dev_get_drvdata(dev);
4724
4725 return sprintf(buf, "%lld",
4726 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4727}
4728static DEVICE_ATTR_RO(read_ns);
4729
4730/**
4731 * write_cnt_show - write count - number of user calls
4732 * to write(2) that have written data to tape.
4733 * @dev: struct device
4734 * @attr: attribute structure
4735 * @buf: buffer to return formatted data in
4736 */
4737static ssize_t write_cnt_show(struct device *dev,
4738 struct device_attribute *attr, char *buf)
4739{
4740 struct st_modedef *STm = dev_get_drvdata(dev);
4741
4742 return sprintf(buf, "%lld",
4743 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4744}
4745static DEVICE_ATTR_RO(write_cnt);
4746
4747/**
4748 * write_byte_cnt_show - write byte count - raw count of
4749 * bytes written to tape.
4750 * @dev: struct device
4751 * @attr: attribute structure
4752 * @buf: buffer to return formatted data in
4753 */
4754static ssize_t write_byte_cnt_show(struct device *dev,
4755 struct device_attribute *attr, char *buf)
4756{
4757 struct st_modedef *STm = dev_get_drvdata(dev);
4758
4759 return sprintf(buf, "%lld",
4760 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4761}
4762static DEVICE_ATTR_RO(write_byte_cnt);
4763
4764/**
4765 * write_ns_show - write ns - number of nanoseconds waiting on write
4766 * requests to complete.
4767 * @dev: struct device
4768 * @attr: attribute structure
4769 * @buf: buffer to return formatted data in
4770 */
4771static ssize_t write_ns_show(struct device *dev,
4772 struct device_attribute *attr, char *buf)
4773{
4774 struct st_modedef *STm = dev_get_drvdata(dev);
4775
4776 return sprintf(buf, "%lld",
4777 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4778}
4779static DEVICE_ATTR_RO(write_ns);
4780
4781/**
4782 * in_flight_show - number of I/Os currently in flight -
4783 * in most cases this will be either 0 or 1. It may be higher if someone
4784 * has also issued other SCSI commands such as via an ioctl.
4785 * @dev: struct device
4786 * @attr: attribute structure
4787 * @buf: buffer to return formatted data in
4788 */
4789static ssize_t in_flight_show(struct device *dev,
4790 struct device_attribute *attr, char *buf)
4791{
4792 struct st_modedef *STm = dev_get_drvdata(dev);
4793
4794 return sprintf(buf, "%lld",
4795 (long long)atomic64_read(&STm->tape->stats->in_flight));
4796}
4797static DEVICE_ATTR_RO(in_flight);
4798
4799/**
4800 * io_ns_show - io wait ns - this is the number of ns spent
4801 * waiting on all I/O to complete. This includes tape movement commands
4802 * such as rewinding, seeking to end of file or tape, it also includes
4803 * read and write. To determine the time spent on tape movement
4804 * subtract the read and write ns from this value.
4805 * @dev: struct device
4806 * @attr: attribute structure
4807 * @buf: buffer to return formatted data in
4808 */
4809static ssize_t io_ns_show(struct device *dev,
4810 struct device_attribute *attr, char *buf)
4811{
4812 struct st_modedef *STm = dev_get_drvdata(dev);
4813
4814 return sprintf(buf, "%lld",
4815 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4816}
4817static DEVICE_ATTR_RO(io_ns);
4818
4819/**
4820 * other_cnt_show - other io count - this is the number of
4821 * I/O requests other than read and write requests.
4822 * Typically these are tape movement requests but will include driver
4823 * tape movement. This includes only requests issued by the st driver.
4824 * @dev: struct device
4825 * @attr: attribute structure
4826 * @buf: buffer to return formatted data in
4827 */
4828static ssize_t other_cnt_show(struct device *dev,
4829 struct device_attribute *attr, char *buf)
4830{
4831 struct st_modedef *STm = dev_get_drvdata(dev);
4832
4833 return sprintf(buf, "%lld",
4834 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4835}
4836static DEVICE_ATTR_RO(other_cnt);
4837
4838/**
4839 * resid_cnt_show - A count of the number of times we get a residual
4840 * count - this should indicate someone issuing reads larger than the
4841 * block size on tape.
4842 * @dev: struct device
4843 * @attr: attribute structure
4844 * @buf: buffer to return formatted data in
4845 */
4846static ssize_t resid_cnt_show(struct device *dev,
4847 struct device_attribute *attr, char *buf)
4848{
4849 struct st_modedef *STm = dev_get_drvdata(dev);
4850
4851 return sprintf(buf, "%lld",
4852 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4853}
4854static DEVICE_ATTR_RO(resid_cnt);
4855
c69c6be5
GKH		 4856static struct attribute *st_dev_attrs[] = {
4857 &dev_attr_defined.attr,
4858 &dev_attr_default_blksize.attr,
4859 &dev_attr_default_density.attr,
4860 &dev_attr_default_compression.attr,
4861 &dev_attr_options.attr,
4862 NULL,
af23782b 4863};
05545c92
SS		 4864
4865static struct attribute *st_stats_attrs[] = {
4866 &dev_attr_read_cnt.attr,
4867 &dev_attr_read_byte_cnt.attr,
4868 &dev_attr_read_ns.attr,
4869 &dev_attr_write_cnt.attr,
4870 &dev_attr_write_byte_cnt.attr,
4871 &dev_attr_write_ns.attr,
4872 &dev_attr_in_flight.attr,
4873 &dev_attr_io_ns.attr,
4874 &dev_attr_other_cnt.attr,
4875 &dev_attr_resid_cnt.attr,
4876 NULL,
4877};
4878
4879static struct attribute_group stats_group = {
4880 .name = "stats",
4881 .attrs = st_stats_attrs,
4882};
4883
4884static struct attribute_group st_group = {
4885 .attrs = st_dev_attrs,
4886};
4887
4888static const struct attribute_group *st_dev_groups[] = {
4889 &st_group,
4890 &stats_group,
4891 NULL,
4892};
b174be02 4893
1da177e4 4894/* The following functions may be useful for a larger audience. */
6620742f
FT		 4895static int sgl_map_user_pages(struct st_buffer *STbp,
4896 const unsigned int max_pages, unsigned long uaddr,
4897 size_t count, int rw)
1da177e4 4898{
07542b83
JB		 4899 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4900 unsigned long start = uaddr >> PAGE_SHIFT;
4901 const int nr_pages = end - start;
1da177e4 4902 int res, i, j;
1da177e4 4903 struct page **pages;
6620742f 4904 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4905
1da177e4
LT		 4906 /* User attempted Overflow! */
4907 if ((uaddr + count) < uaddr)
4908 return -EINVAL;
4909
4910 /* Too big */
4911 if (nr_pages > max_pages)
4912 return -ENOMEM;
4913
4914 /* Hmm? */
4915 if (count == 0)
4916 return 0;
4917
4918 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4919 return -ENOMEM;
4920
4921 /* Try to fault in all of the necessary pages */
1da177e4 4922 /* rw==READ means read from drive, write into memory area */
7e339128 4923 res = get_user_pages_unlocked(
1da177e4
LT		 4924 uaddr,
4925 nr_pages,
c164154f
LS		 4926 pages,
4927 rw == READ ? FOLL_WRITE : 0); /* don't force */
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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