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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski...
[linux-2.6-block.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>
26#include <linux/sched.h>
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
LT		 43
44#include <asm/uaccess.h>
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();
478 if (req->cmd[0] == WRITE_6) {
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);
483 if (req->errors) {
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);
492 } else if (req->cmd[0] == READ_6) {
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);
497 if (req->errors) {
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
13b53b44
FT		 514static void st_scsi_execute_end(struct request *req, int uptodate)
515{
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_tape *STp = SRpnt->stp;
c68bf8ee 518 struct bio *tmp;
13b53b44
FT		 519
520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
c3a4d78c 521 STp->buffer->cmdstat.residual = req->resid_len;
13b53b44 522
05545c92
SS		 523 st_do_stats(STp, req);
524
c68bf8ee 525 tmp = SRpnt->bio;
13b53b44
FT		 526 if (SRpnt->waiting)
527 complete(SRpnt->waiting);
528
c68bf8ee 529 blk_rq_unmap_user(tmp);
13b53b44
FT		 530 __blk_put_request(req->q, req);
531}
532
533static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
534 int data_direction, void *buffer, unsigned bufflen,
535 int timeout, int retries)
536{
537 struct request *req;
538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
539 int err = 0;
540 int write = (data_direction == DMA_TO_DEVICE);
05545c92 541 struct scsi_tape *STp = SRpnt->stp;
13b53b44
FT		 542
543 req = blk_get_request(SRpnt->stp->device->request_queue, write,
544 GFP_KERNEL);
a492f075 545 if (IS_ERR(req))
13b53b44
FT		 546 return DRIVER_ERROR << 24;
547
f27b087b 548 blk_rq_set_block_pc(req);
13b53b44
FT		 549 req->cmd_flags |= REQ_QUIET;
550
551 mdata->null_mapped = 1;
552
02ae2c0e
KM		 553 if (bufflen) {
554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
555 GFP_KERNEL);
556 if (err) {
557 blk_put_request(req);
558 return DRIVER_ERROR << 24;
559 }
13b53b44
FT		 560 }
561
05545c92
SS		 562 atomic64_inc(&STp->stats->in_flight);
563 if (cmd[0] == WRITE_6) {
564 atomic_set(&STp->stats->last_write_size, bufflen);
565 STp->stats->write_time = ktime_get();
566 } else if (cmd[0] == READ_6) {
567 atomic_set(&STp->stats->last_read_size, bufflen);
568 STp->stats->read_time = ktime_get();
569 } else {
570 STp->stats->other_time = ktime_get();
571 }
572
13b53b44
FT		 573 SRpnt->bio = req->bio;
574 req->cmd_len = COMMAND_SIZE(cmd[0]);
575 memset(req->cmd, 0, BLK_MAX_CDB);
576 memcpy(req->cmd, cmd, req->cmd_len);
577 req->sense = SRpnt->sense;
578 req->sense_len = 0;
579 req->timeout = timeout;
580 req->retries = retries;
581 req->end_io_data = SRpnt;
582
583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
584 return 0;
585}
586
1da177e4
LT		 587/* Do the scsi command. Waits until command performed if do_wait is true.
588 Otherwise write_behind_check() is used to check that the command
589 has finished. */
8b05b773
MC		 590static struct st_request *
591st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
1da177e4
LT		 592 int bytes, int direction, int timeout, int retries, int do_wait)
593{
f03a5670 594 struct completion *waiting;
6d476267
FT		 595 struct rq_map_data *mdata = &STp->buffer->map_data;
596 int ret;
1da177e4 597
f03a5670
KM		 598 /* if async, make sure there's no command outstanding */
599 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
b30d8bca
HR		 600 st_printk(KERN_ERR, STp,
601 "Async command already active.\n");
f03a5670
KM		 602 if (signal_pending(current))
603 (STp->buffer)->syscall_result = (-EINTR);
604 else
605 (STp->buffer)->syscall_result = (-EBUSY);
606 return NULL;
607 }
608
4deba245
FT		 609 if (!SRpnt) {
610 SRpnt = st_allocate_request(STp);
611 if (!SRpnt)
1da177e4 612 return NULL;
1da177e4
LT		 613 }
614
f03a5670
KM		 615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
616 which IO is outstanding. It's nulled out when the IO completes. */
617 if (!do_wait)
618 (STp->buffer)->last_SRpnt = SRpnt;
619
620 waiting = &STp->wait;
621 init_completion(waiting);
8b05b773 622 SRpnt->waiting = waiting;
1da177e4 623
6620742f 624 if (STp->buffer->do_dio) {
c982c368 625 mdata->page_order = 0;
6620742f
FT		 626 mdata->nr_entries = STp->buffer->sg_segs;
627 mdata->pages = STp->buffer->mapped_pages;
628 } else {
c982c368 629 mdata->page_order = STp->buffer->reserved_page_order;
6d476267
FT		 630 mdata->nr_entries =
631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
c982c368
FT		 632 mdata->pages = STp->buffer->reserved_pages;
633 mdata->offset = 0;
6d476267
FT		 634 }
635
8b05b773
MC		 636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
637 STp->buffer->cmdstat.have_sense = 0;
638 STp->buffer->syscall_result = 0;
639
6620742f
FT		 640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
641 retries);
6d476267 642 if (ret) {
8b05b773
MC		 643 /* could not allocate the buffer or request was too large */
644 (STp->buffer)->syscall_result = (-EBUSY);
787926b1 645 (STp->buffer)->last_SRpnt = NULL;
6d476267 646 } else if (do_wait) {
f03a5670 647 wait_for_completion(waiting);
8b05b773 648 SRpnt->waiting = NULL;
1da177e4
LT		 649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
650 }
8b05b773 651
1da177e4
LT		 652 return SRpnt;
653}
654
655
656/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
657 write has been correct but EOM early warning reached, -EIO if write ended in
658 error or zero if write successful. Asynchronous writes are used only in
659 variable block mode. */
660static int write_behind_check(struct scsi_tape * STp)
661{
662 int retval = 0;
663 struct st_buffer *STbuffer;
664 struct st_partstat *STps;
665 struct st_cmdstatus *cmdstatp;
8b05b773 666 struct st_request *SRpnt;
1da177e4
LT		 667
668 STbuffer = STp->buffer;
669 if (!STbuffer->writing)
670 return 0;
671
b30d8bca 672 DEB(
1da177e4
LT		 673 if (STp->write_pending)
674 STp->nbr_waits++;
675 else
676 STp->nbr_finished++;
b30d8bca 677 ) /* end DEB */
1da177e4
LT		 678
679 wait_for_completion(&(STp->wait));
f03a5670
KM		 680 SRpnt = STbuffer->last_SRpnt;
681 STbuffer->last_SRpnt = NULL;
8b05b773 682 SRpnt->waiting = NULL;
1da177e4 683
f03a5670 684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
8b05b773 685 st_release_request(SRpnt);
1da177e4
LT		 686
687 STbuffer->buffer_bytes -= STbuffer->writing;
688 STps = &(STp->ps[STp->partition]);
689 if (STps->drv_block >= 0) {
690 if (STp->block_size == 0)
691 STps->drv_block++;
692 else
693 STps->drv_block += STbuffer->writing / STp->block_size;
694 }
695
696 cmdstatp = &STbuffer->cmdstat;
697 if (STbuffer->syscall_result) {
698 retval = -EIO;
699 if (cmdstatp->have_sense && !cmdstatp->deferred &&
700 (cmdstatp->flags & SENSE_EOM) &&
701 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
703 /* EOM at write-behind, has all data been written? */
704 if (!cmdstatp->remainder_valid ||
705 cmdstatp->uremainder64 == 0)
706 retval = -ENOSPC;
707 }
708 if (retval == -EIO)
709 STps->drv_block = -1;
710 }
711 STbuffer->writing = 0;
712
713 DEB(if (debugging && retval)
b30d8bca
HR		 714 st_printk(ST_DEB_MSG, STp,
715 "Async write error %x, return value %d.\n",
716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
1da177e4
LT		 717
718 return retval;
719}
720
721
722/* Step over EOF if it has been inadvertently crossed (ioctl not used because
723 it messes up the block number). */
724static int cross_eof(struct scsi_tape * STp, int forward)
725{
8b05b773 726 struct st_request *SRpnt;
1da177e4
LT		 727 unsigned char cmd[MAX_COMMAND_SIZE];
728
729 cmd[0] = SPACE;
730 cmd[1] = 0x01; /* Space FileMarks */
731 if (forward) {
732 cmd[2] = cmd[3] = 0;
733 cmd[4] = 1;
734 } else
735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
736 cmd[5] = 0;
737
b30d8bca
HR		 738 DEBC_printk(STp, "Stepping over filemark %s.\n",
739 forward ? "forward" : "backward");
1da177e4 740
02ae2c0e
KM		 741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
742 STp->device->request_queue->rq_timeout,
743 MAX_RETRIES, 1);
1da177e4 744 if (!SRpnt)
02ae2c0e 745 return (STp->buffer)->syscall_result;
39ade4b1 746
02ae2c0e
KM		 747 st_release_request(SRpnt);
748 SRpnt = NULL;
1da177e4
LT		 749
750 if ((STp->buffer)->cmdstat.midlevel_result != 0)
b30d8bca
HR		 751 st_printk(KERN_ERR, STp,
752 "Stepping over filemark %s failed.\n",
753 forward ? "forward" : "backward");
1da177e4 754
02ae2c0e 755 return (STp->buffer)->syscall_result;
1da177e4
LT		 756}
757
758
759/* Flush the write buffer (never need to write if variable blocksize). */
8ef8d594 760static int st_flush_write_buffer(struct scsi_tape * STp)
1da177e4 761{
786231af 762 int transfer, blks;
1da177e4
LT		 763 int result;
764 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 765 struct st_request *SRpnt;
1da177e4
LT		 766 struct st_partstat *STps;
767
768 result = write_behind_check(STp);
769 if (result)
770 return result;
771
772 result = 0;
773 if (STp->dirty == 1) {
774
786231af 775 transfer = STp->buffer->buffer_bytes;
b30d8bca 776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
1da177e4 777
1da177e4
LT		 778 memset(cmd, 0, MAX_COMMAND_SIZE);
779 cmd[0] = WRITE_6;
780 cmd[1] = 1;
781 blks = transfer / STp->block_size;
782 cmd[2] = blks >> 16;
783 cmd[3] = blks >> 8;
784 cmd[4] = blks;
785
786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 787 STp->device->request_queue->rq_timeout,
788 MAX_WRITE_RETRIES, 1);
1da177e4
LT		 789 if (!SRpnt)
790 return (STp->buffer)->syscall_result;
791
792 STps = &(STp->ps[STp->partition]);
793 if ((STp->buffer)->syscall_result != 0) {
794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
795
796 if (cmdstatp->have_sense && !cmdstatp->deferred &&
797 (cmdstatp->flags & SENSE_EOM) &&
798 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
800 (!cmdstatp->remainder_valid ||
801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
802 STp->dirty = 0;
803 (STp->buffer)->buffer_bytes = 0;
804 if (STps->drv_block >= 0)
805 STps->drv_block += blks;
806 result = (-ENOSPC);
807 } else {
b30d8bca 808 st_printk(KERN_ERR, STp, "Error on flush.\n");
1da177e4
LT		 809 STps->drv_block = (-1);
810 result = (-EIO);
811 }
812 } else {
813 if (STps->drv_block >= 0)
814 STps->drv_block += blks;
815 STp->dirty = 0;
816 (STp->buffer)->buffer_bytes = 0;
817 }
8b05b773 818 st_release_request(SRpnt);
1da177e4
LT		 819 SRpnt = NULL;
820 }
821 return result;
822}
823
824
825/* Flush the tape buffer. The tape will be positioned correctly unless
826 seek_next is true. */
827static int flush_buffer(struct scsi_tape *STp, int seek_next)
828{
829 int backspace, result;
830 struct st_buffer *STbuffer;
831 struct st_partstat *STps;
832
833 STbuffer = STp->buffer;
834
835 /*
836 * If there was a bus reset, block further access
837 * to this device.
838 */
839 if (STp->pos_unknown)
840 return (-EIO);
841
842 if (STp->ready != ST_READY)
843 return 0;
844 STps = &(STp->ps[STp->partition]);
845 if (STps->rw == ST_WRITING) /* Writing */
8ef8d594 846 return st_flush_write_buffer(STp);
1da177e4
LT		 847
848 if (STp->block_size == 0)
849 return 0;
850
851 backspace = ((STp->buffer)->buffer_bytes +
852 (STp->buffer)->read_pointer) / STp->block_size -
853 ((STp->buffer)->read_pointer + STp->block_size - 1) /
854 STp->block_size;
855 (STp->buffer)->buffer_bytes = 0;
856 (STp->buffer)->read_pointer = 0;
857 result = 0;
858 if (!seek_next) {
859 if (STps->eof == ST_FM_HIT) {
860 result = cross_eof(STp, 0); /* Back over the EOF hit */
861 if (!result)
862 STps->eof = ST_NOEOF;
863 else {
864 if (STps->drv_file >= 0)
865 STps->drv_file++;
866 STps->drv_block = 0;
867 }
868 }
869 if (!result && backspace > 0)
870 result = st_int_ioctl(STp, MTBSR, backspace);
871 } else if (STps->eof == ST_FM_HIT) {
872 if (STps->drv_file >= 0)
873 STps->drv_file++;
874 STps->drv_block = 0;
875 STps->eof = ST_NOEOF;
876 }
877 return result;
878
879}
880\f
881/* Set the mode parameters */
882static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
883{
884 int set_it = 0;
885 unsigned long arg;
1da177e4
LT		 886
887 if (!STp->density_changed &&
888 STm->default_density >= 0 &&
889 STm->default_density != STp->density) {
890 arg = STm->default_density;
891 set_it = 1;
892 } else
893 arg = STp->density;
894 arg <<= MT_ST_DENSITY_SHIFT;
895 if (!STp->blksize_changed &&
896 STm->default_blksize >= 0 &&
897 STm->default_blksize != STp->block_size) {
898 arg |= STm->default_blksize;
899 set_it = 1;
900 } else
901 arg |= STp->block_size;
902 if (set_it &&
903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
b30d8bca
HR		 904 st_printk(KERN_WARNING, STp,
905 "Can't set default block size to %d bytes "
906 "and density %x.\n",
907 STm->default_blksize, STm->default_density);
1da177e4
LT		 908 if (modes_defined)
909 return (-EINVAL);
910 }
911 return 0;
912}
913
914
8b05b773 915/* Lock or unlock the drive door. Don't use when st_request allocated. */
1da177e4
LT		 916static int do_door_lock(struct scsi_tape * STp, int do_lock)
917{
dccfa688 918 int retval;
1da177e4 919
b30d8bca 920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
dccfa688
CH		 921
922 retval = scsi_set_medium_removal(STp->device,
923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
924 if (!retval)
1da177e4 925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
dccfa688 926 else
1da177e4 927 STp->door_locked = ST_LOCK_FAILS;
1da177e4
LT		 928 return retval;
929}
930
931
932/* Set the internal state after reset */
933static void reset_state(struct scsi_tape *STp)
934{
935 int i;
936 struct st_partstat *STps;
937
938 STp->pos_unknown = 0;
939 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
940 STps = &(STp->ps[i]);
941 STps->rw = ST_IDLE;
942 STps->eof = ST_NOEOF;
943 STps->at_sm = 0;
944 STps->last_block_valid = 0;
945 STps->drv_block = -1;
946 STps->drv_file = -1;
947 }
948 if (STp->can_partitions) {
949 STp->partition = find_partition(STp);
950 if (STp->partition < 0)
951 STp->partition = 0;
952 STp->new_partition = STp->partition;
953 }
954}
955\f
956/* Test if the drive is ready. Returns either one of the codes below or a negative system
957 error code. */
958#define CHKRES_READY 0
959#define CHKRES_NEW_SESSION 1
960#define CHKRES_NOT_READY 2
961#define CHKRES_NO_TAPE 3
962
963#define MAX_ATTENTIONS 10
964
965static int test_ready(struct scsi_tape *STp, int do_wait)
966{
967 int attentions, waits, max_wait, scode;
968 int retval = CHKRES_READY, new_session = 0;
969 unsigned char cmd[MAX_COMMAND_SIZE];
02ae2c0e 970 struct st_request *SRpnt = NULL;
1da177e4
LT		 971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
972
973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
974
975 for (attentions=waits=0; ; ) {
976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
977 cmd[0] = TEST_UNIT_READY;
02ae2c0e
KM		 978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
979 STp->long_timeout, MAX_READY_RETRIES, 1);
1da177e4 980
02ae2c0e
KM		 981 if (!SRpnt) {
982 retval = (STp->buffer)->syscall_result;
1da177e4 983 break;
02ae2c0e 984 }
1da177e4
LT		 985
986 if (cmdstatp->have_sense) {
987
988 scode = cmdstatp->sense_hdr.sense_key;
989
990 if (scode == UNIT_ATTENTION) { /* New media? */
991 new_session = 1;
992 if (attentions < MAX_ATTENTIONS) {
993 attentions++;
994 continue;
995 }
996 else {
997 retval = (-EIO);
998 break;
999 }
1000 }
1001
1002 if (scode == NOT_READY) {
1003 if (waits < max_wait) {
1004 if (msleep_interruptible(1000)) {
1005 retval = (-EINTR);
1006 break;
1007 }
1008 waits++;
1009 continue;
1010 }
1011 else {
1012 if ((STp->device)->scsi_level >= SCSI_2 &&
1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1014 retval = CHKRES_NO_TAPE;
1015 else
1016 retval = CHKRES_NOT_READY;
1017 break;
1018 }
1019 }
1020 }
1021
1022 retval = (STp->buffer)->syscall_result;
1023 if (!retval)
1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1025 break;
1026 }
1027
02ae2c0e
KM		 1028 if (SRpnt != NULL)
1029 st_release_request(SRpnt);
1da177e4
LT		 1030 return retval;
1031}
1032
1033
1034/* See if the drive is ready and gather information about the tape. Return values:
1035 < 0 negative error code from errno.h
1036 0 drive ready
1037 1 drive not ready (possibly no tape)
1038*/
1039static int check_tape(struct scsi_tape *STp, struct file *filp)
1040{
1041 int i, retval, new_session = 0, do_wait;
1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1043 unsigned short st_flags = filp->f_flags;
8b05b773 1044 struct st_request *SRpnt = NULL;
1da177e4
LT		 1045 struct st_modedef *STm;
1046 struct st_partstat *STps;
496ad9aa 1047 struct inode *inode = file_inode(filp);
1da177e4
LT		 1048 int mode = TAPE_MODE(inode);
1049
1050 STp->ready = ST_READY;
1051
1052 if (mode != STp->current_mode) {
b30d8bca
HR		 1053 DEBC_printk(STp, "Mode change from %d to %d.\n",
1054 STp->current_mode, mode);
1da177e4
LT		 1055 new_session = 1;
1056 STp->current_mode = mode;
1057 }
1058 STm = &(STp->modes[STp->current_mode]);
1059
1060 saved_cleaning = STp->cleaning_req;
1061 STp->cleaning_req = 0;
1062
1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1064 retval = test_ready(STp, do_wait);
1065
1066 if (retval < 0)
1067 goto err_out;
1068
1069 if (retval == CHKRES_NEW_SESSION) {
1070 STp->pos_unknown = 0;
1071 STp->partition = STp->new_partition = 0;
1072 if (STp->can_partitions)
1073 STp->nbr_partitions = 1; /* This guess will be updated later
1074 if necessary */
1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1076 STps = &(STp->ps[i]);
1077 STps->rw = ST_IDLE;
1078 STps->eof = ST_NOEOF;
1079 STps->at_sm = 0;
1080 STps->last_block_valid = 0;
1081 STps->drv_block = 0;
1082 STps->drv_file = 0;
1083 }
1084 new_session = 1;
1085 }
1086 else {
1087 STp->cleaning_req |= saved_cleaning;
1088
1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1090 if (retval == CHKRES_NO_TAPE)
1091 STp->ready = ST_NO_TAPE;
1092 else
1093 STp->ready = ST_NOT_READY;
1094
1095 STp->density = 0; /* Clear the erroneous "residue" */
1096 STp->write_prot = 0;
1097 STp->block_size = 0;
1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1099 STp->partition = STp->new_partition = 0;
1100 STp->door_locked = ST_UNLOCKED;
1101 return CHKRES_NOT_READY;
1102 }
1103 }
1104
1105 if (STp->omit_blklims)
1106 STp->min_block = STp->max_block = (-1);
1107 else {
1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1109 cmd[0] = READ_BLOCK_LIMITS;
1110
02ae2c0e
KM		 1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1112 STp->device->request_queue->rq_timeout,
1113 MAX_READY_RETRIES, 1);
1114 if (!SRpnt) {
1115 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1116 goto err_out;
1117 }
1118
8b05b773 1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1da177e4
LT		 1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1123 (STp->buffer)->b_data[5];
1124 if ( DEB( debugging || ) !STp->inited)
b30d8bca
HR		 1125 st_printk(KERN_INFO, STp,
1126 "Block limits %d - %d bytes.\n",
1127 STp->min_block, STp->max_block);
1da177e4
LT		 1128 } else {
1129 STp->min_block = STp->max_block = (-1);
b30d8bca 1130 DEBC_printk(STp, "Can't read block limits.\n");
1da177e4
LT		 1131 }
1132 }
1133
1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1135 cmd[0] = MODE_SENSE;
1136 cmd[4] = 12;
1137
02ae2c0e
KM		 1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1139 STp->device->request_queue->rq_timeout,
1140 MAX_READY_RETRIES, 1);
1141 if (!SRpnt) {
1142 retval = (STp->buffer)->syscall_result;
1da177e4
LT		 1143 goto err_out;
1144 }
1145
1146 if ((STp->buffer)->syscall_result != 0) {
b30d8bca 1147 DEBC_printk(STp, "No Mode Sense.\n");
1da177e4
LT		 1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1150 STp->drv_write_prot = 0;
1151 } else {
b30d8bca
HR		 1152 DEBC_printk(STp,"Mode sense. Length %d, "
1153 "medium %x, WBS %x, BLL %d\n",
1154 (STp->buffer)->b_data[0],
1155 (STp->buffer)->b_data[1],
1156 (STp->buffer)->b_data[2],
1157 (STp->buffer)->b_data[3]);
1da177e4
LT		 1158
1159 if ((STp->buffer)->b_data[3] >= 8) {
1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1161 STp->density = (STp->buffer)->b_data[4];
1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
b30d8bca
HR		 1164 DEBC_printk(STp, "Density %x, tape length: %x, "
1165 "drv buffer: %d\n",
1166 STp->density,
1167 (STp->buffer)->b_data[5] * 65536 +
1168 (STp->buffer)->b_data[6] * 256 +
1169 (STp->buffer)->b_data[7],
1170 STp->drv_buffer);
1da177e4
LT		 1171 }
1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
c743e44f 1173 if (!STp->drv_buffer && STp->immediate_filemark) {
b30d8bca
HR		 1174 st_printk(KERN_WARNING, STp,
1175 "non-buffered tape: disabling "
1176 "writing immediate filemarks\n");
c743e44f
LD		 1177 STp->immediate_filemark = 0;
1178 }
1da177e4 1179 }
8b05b773 1180 st_release_request(SRpnt);
1da177e4 1181 SRpnt = NULL;
b30d8bca 1182 STp->inited = 1;
1da177e4
LT		 1183
1184 if (STp->block_size > 0)
1185 (STp->buffer)->buffer_blocks =
b30d8bca 1186 (STp->buffer)->buffer_size / STp->block_size;
1da177e4
LT		 1187 else
1188 (STp->buffer)->buffer_blocks = 1;
1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1190
b30d8bca
HR		 1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1192 STp->block_size, (STp->buffer)->buffer_size,
1193 (STp->buffer)->buffer_blocks);
1da177e4
LT		 1194
1195 if (STp->drv_write_prot) {
1196 STp->write_prot = 1;
1197
b30d8bca 1198 DEBC_printk(STp, "Write protected\n");
1da177e4
LT		 1199
1200 if (do_wait &&
1201 ((st_flags & O_ACCMODE) == O_WRONLY ||
1202 (st_flags & O_ACCMODE) == O_RDWR)) {
1203 retval = (-EROFS);
1204 goto err_out;
1205 }
1206 }
1207
1208 if (STp->can_partitions && STp->nbr_partitions < 1) {
1209 /* This code is reached when the device is opened for the first time
1210 after the driver has been initialized with tape in the drive and the
1211 partition support has been enabled. */
b30d8bca 1212 DEBC_printk(STp, "Updating partition number in status.\n");
1da177e4
LT		 1213 if ((STp->partition = find_partition(STp)) < 0) {
1214 retval = STp->partition;
1215 goto err_out;
1216 }
1217 STp->new_partition = STp->partition;
1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1219 }
1220
1221 if (new_session) { /* Change the drive parameters for the new mode */
1222 STp->density_changed = STp->blksize_changed = 0;
1223 STp->compression_changed = 0;
1224 if (!(STm->defaults_for_writes) &&
1225 (retval = set_mode_densblk(STp, STm)) < 0)
1226 goto err_out;
1227
1228 if (STp->default_drvbuffer != 0xff) {
1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
b30d8bca
HR		 1230 st_printk(KERN_WARNING, STp,
1231 "Can't set default drive "
1232 "buffering to %d.\n",
1233 STp->default_drvbuffer);
1da177e4
LT		 1234 }
1235 }
1236
1237 return CHKRES_READY;
1238
1239 err_out:
1240 return retval;
1241}
1242
1243
b3369c68 1244\f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1da177e4
LT		 1245 module count. */
1246static int st_open(struct inode *inode, struct file *filp)
1247{
1248 int i, retval = (-EIO);
46a243f7 1249 int resumed = 0;
1da177e4
LT		 1250 struct scsi_tape *STp;
1251 struct st_partstat *STps;
1252 int dev = TAPE_NR(inode);
1da177e4
LT		 1253
1254 /*
1255 * We really want to do nonseekable_open(inode, filp); here, but some
1256 * versions of tar incorrectly call lseek on tapes and bail out if that
1257 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1258 */
1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1260
b3369c68 1261 if (!(STp = scsi_tape_get(dev))) {
f03a5670 1262 return -ENXIO;
b3369c68 1263 }
f03a5670 1264
1da177e4 1265 filp->private_data = STp;
1da177e4 1266
6c648d95 1267 spin_lock(&st_use_lock);
1da177e4 1268 if (STp->in_use) {
6c648d95 1269 spin_unlock(&st_use_lock);
f03a5670 1270 scsi_tape_put(STp);
b30d8bca 1271 DEBC_printk(STp, "Device already in use.\n");
1da177e4
LT		 1272 return (-EBUSY);
1273 }
1274
1da177e4 1275 STp->in_use = 1;
6c648d95 1276 spin_unlock(&st_use_lock);
1da177e4
LT		 1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1278
46a243f7
ON		 1279 if (scsi_autopm_get_device(STp->device) < 0) {
1280 retval = -EIO;
1281 goto err_out;
1282 }
1283 resumed = 1;
1da177e4
LT		 1284 if (!scsi_block_when_processing_errors(STp->device)) {
1285 retval = (-ENXIO);
1286 goto err_out;
1287 }
1288
1289 /* See that we have at least a one page buffer available */
1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
b30d8bca
HR		 1291 st_printk(KERN_WARNING, STp,
1292 "Can't allocate one page tape buffer.\n");
1da177e4
LT		 1293 retval = (-EOVERFLOW);
1294 goto err_out;
1295 }
1296
40f6b36c 1297 (STp->buffer)->cleared = 0;
1da177e4
LT		 1298 (STp->buffer)->writing = 0;
1299 (STp->buffer)->syscall_result = 0;
1300
1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1302
1303 STp->dirty = 0;
1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1305 STps = &(STp->ps[i]);
1306 STps->rw = ST_IDLE;
1307 }
9abe16c6 1308 STp->try_dio_now = STp->try_dio;
1da177e4
LT		 1309 STp->recover_count = 0;
1310 DEB( STp->nbr_waits = STp->nbr_finished = 0;
deee13df 1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1da177e4
LT		 1312
1313 retval = check_tape(STp, filp);
1314 if (retval < 0)
1315 goto err_out;
1316 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1317 retval != CHKRES_READY) {
413f7327
KM		 1318 if (STp->ready == NO_TAPE)
1319 retval = (-ENOMEDIUM);
1320 else
1321 retval = (-EIO);
1da177e4
LT		 1322 goto err_out;
1323 }
1324 return 0;
1325
1326 err_out:
1327 normalize_buffer(STp->buffer);
0644f539 1328 spin_lock(&st_use_lock);
1da177e4 1329 STp->in_use = 0;
0644f539 1330 spin_unlock(&st_use_lock);
46a243f7
ON		 1331 if (resumed)
1332 scsi_autopm_put_device(STp->device);
e7ac6c66 1333 scsi_tape_put(STp);
1da177e4
LT		 1334 return retval;
1335
1336}
1337\f
1338
1339/* Flush the tape buffer before close */
75e1fcc0 1340static int st_flush(struct file *filp, fl_owner_t id)
1da177e4
LT		 1341{
1342 int result = 0, result2;
1343 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1344 struct st_request *SRpnt;
1da177e4
LT		 1345 struct scsi_tape *STp = filp->private_data;
1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1347 struct st_partstat *STps = &(STp->ps[STp->partition]);
1da177e4
LT		 1348
1349 if (file_count(filp) > 1)
1350 return 0;
1351
1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
8ef8d594 1353 result = st_flush_write_buffer(STp);
1da177e4
LT		 1354 if (result != 0 && result != (-ENOSPC))
1355 goto out;
1356 }
1357
1358 if (STp->can_partitions &&
1359 (result2 = switch_partition(STp)) < 0) {
b30d8bca 1360 DEBC_printk(STp, "switch_partition at close failed.\n");
1da177e4
LT		 1361 if (result == 0)
1362 result = result2;
1363 goto out;
1364 }
1365
1366 DEBC( if (STp->nbr_requests)
b30d8bca
HR		 1367 st_printk(KERN_DEBUG, STp,
1368 "Number of r/w requests %d, dio used in %d, "
1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1370 STp->nbr_pages));
1da177e4
LT		 1371
1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1374
b30d8bca
HR		 1375#if DEBUG
1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1377 STp->nbr_waits, STp->nbr_finished);
1378#endif
1da177e4
LT		 1379 memset(cmd, 0, MAX_COMMAND_SIZE);
1380 cmd[0] = WRITE_FILEMARKS;
c743e44f
LD		 1381 if (STp->immediate_filemark)
1382 cmd[1] = 1;
1da177e4
LT		 1383 cmd[4] = 1 + STp->two_fm;
1384
02ae2c0e
KM		 1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1386 STp->device->request_queue->rq_timeout,
1387 MAX_WRITE_RETRIES, 1);
1da177e4 1388 if (!SRpnt) {
02ae2c0e 1389 result = (STp->buffer)->syscall_result;
1da177e4
LT		 1390 goto out;
1391 }
1392
1393 if (STp->buffer->syscall_result == 0 ||
1394 (cmdstatp->have_sense && !cmdstatp->deferred &&
1395 (cmdstatp->flags & SENSE_EOM) &&
1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1399 /* Write successful at EOM */
8b05b773 1400 st_release_request(SRpnt);
1da177e4
LT		 1401 SRpnt = NULL;
1402 if (STps->drv_file >= 0)
1403 STps->drv_file++;
1404 STps->drv_block = 0;
1405 if (STp->two_fm)
1406 cross_eof(STp, 0);
1407 STps->eof = ST_FM;
1408 }
1409 else { /* Write error */
8b05b773 1410 st_release_request(SRpnt);
1da177e4 1411 SRpnt = NULL;
b30d8bca
HR		 1412 st_printk(KERN_ERR, STp,
1413 "Error on write filemark.\n");
1da177e4
LT		 1414 if (result == 0)
1415 result = (-EIO);
1416 }
1417
b30d8bca 1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1da177e4
LT		 1419 } else if (!STp->rew_at_close) {
1420 STps = &(STp->ps[STp->partition]);
1421 if (!STm->sysv || STps->rw != ST_READING) {
1422 if (STp->can_bsr)
1423 result = flush_buffer(STp, 0);
1424 else if (STps->eof == ST_FM_HIT) {
1425 result = cross_eof(STp, 0);
1426 if (result) {
1427 if (STps->drv_file >= 0)
1428 STps->drv_file++;
1429 STps->drv_block = 0;
1430 STps->eof = ST_FM;
1431 } else
1432 STps->eof = ST_NOEOF;
1433 }
1434 } else if ((STps->eof == ST_NOEOF &&
1435 !(result = cross_eof(STp, 1))) ||
1436 STps->eof == ST_FM_HIT) {
1437 if (STps->drv_file >= 0)
1438 STps->drv_file++;
1439 STps->drv_block = 0;
1440 STps->eof = ST_FM;
1441 }
1442 }
1443
1444 out:
1445 if (STp->rew_at_close) {
1446 result2 = st_int_ioctl(STp, MTREW, 1);
1447 if (result == 0)
1448 result = result2;
1449 }
1450 return result;
1451}
1452
1453
1454/* Close the device and release it. BKL is not needed: this is the only thread
1455 accessing this tape. */
1456static int st_release(struct inode *inode, struct file *filp)
1457{
1458 int result = 0;
1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
6c648d95 1465 spin_lock(&st_use_lock);
1da177e4 1466 STp->in_use = 0;
6c648d95 1467 spin_unlock(&st_use_lock);
46a243f7 1468 scsi_autopm_put_device(STp->device);
f03a5670 1469 scsi_tape_put(STp);
1da177e4
LT		 1470
1471 return result;
1472}
1473\f
1474/* The checks common to both reading and writing */
1475static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476{
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
b30d8bca 1516 DEB(
1da177e4 1517 if (!STp->in_use) {
b30d8bca
HR		 1518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
1da177e4
LT		 1520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545{
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
9abe16c6 1550 i = STp->try_dio_now && try_rdio;
1da177e4 1551 else
9abe16c6 1552 i = STp->try_dio_now && try_wdio;
8b05b773 1553
1da177e4
LT		 1554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
6620742f
FT		 1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
1da177e4
LT		 1558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
1da177e4
LT		 1565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
1da177e4
LT		 1569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
40f6b36c 1579 else {
1da177e4 1580 bufsize = count;
40f6b36c
KM		 1581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
1da177e4
LT		 1587 if (bufsize > STbp->buffer_size &&
1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
b30d8bca
HR		 1589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
1da177e4
LT		 1592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601}
1602
1603
1604/* Can be called more than once after each setup_buffer() */
787926b1 1605static void release_buffering(struct scsi_tape *STp, int is_read)
1da177e4
LT		 1606{
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
6620742f 1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1da177e4 1612 STbp->do_dio = 0;
787926b1 1613 STbp->sg_segs = 0;
1da177e4
LT		 1614 }
1615}
1616
1617
1618/* Write command */
1619static ssize_t
1620st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621{
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
8b05b773 1629 struct st_request *SRpnt = NULL;
1da177e4
LT		 1630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
1da177e4 1634
28f85009 1635 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 1636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
b30d8bca
HR		 1644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
1da177e4
LT		 1646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
b30d8bca
HR		 1671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
1da177e4
LT		 1673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
9abe16c6 1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1da177e4
LT		 1752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
a02488ed
JB		 1775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
1da177e4
LT		 1777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
8b05b773 1781 if (async_write && !STbp->syscall_result) {
1da177e4
LT		 1782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
b30d8bca 1793 DEBC_printk(STp, "Error on write:\n");
1da177e4
LT		 1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
626dcb1e 1808 b_point -= undone;
1da177e4
LT		 1809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
b30d8bca
HR		 1820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
1da177e4
LT		 1823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
b30d8bca
HR		 1835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
1da177e4
LT		 1839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
b30d8bca
HR		 1849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
1da177e4
LT		 1851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
8b05b773 1856 retval = STbp->syscall_result;
1da177e4
LT		 1857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
8b05b773 1886 st_release_request(SRpnt);
787926b1 1887 release_buffering(STp, 0);
28f85009 1888 mutex_unlock(&STp->lock);
1da177e4
LT		 1889
1890 return retval;
1891}
1892\f
1893/* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898*/
1899static long read_tape(struct scsi_tape *STp, long count,
8b05b773 1900 struct st_request ** aSRpnt)
1da177e4
LT		 1901{
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 1904 struct st_request *SRpnt;
1da177e4
LT		 1905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
1da177e4
LT		 1909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
9abe16c6 1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1da177e4
LT		 1923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
40f6b36c
KM		 1937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
1da177e4
LT		 1939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
a02488ed
JB		 1945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
787926b1 1947 release_buffering(STp, 1);
1da177e4
LT		 1948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
b30d8bca
HR		 1960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
1da177e4
LT		 1966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
1977 if (STp->block_size == 0 &&
1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1979 transfer = bytes;
1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
b30d8bca
HR		 1982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
1da177e4
LT		 1995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
8b05b773 1997 st_release_request(SRpnt);
1da177e4
LT		 1998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
b30d8bca
HR		 2000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
1da177e4
LT		 2003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
b30d8bca
HR		 2011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
1da177e4
LT		 2016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
b30d8bca
HR		 2031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
1da177e4
LT		 2034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
b30d8bca
HR		 2045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
1da177e4
LT		 2048 }
2049 }
b30d8bca 2050 /* end of EOF, EOM, ILI test */
1da177e4 2051 else { /* nonzero sense key */
b30d8bca 2052 DEBC_printk(STp, "Tape error while reading.\n");
1da177e4
LT		 2053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
b30d8bca
HR		 2056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
1da177e4
LT		 2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
b30d8bca 2067 /* End of extended sense test */
1da177e4
LT		 2068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
b30d8bca 2073 /* End of error handling */
40f6b36c 2074 else { /* Read successful */
1da177e4 2075 STbp->buffer_bytes = bytes;
40f6b36c
KM		 2076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
1da177e4
LT		 2079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087}
2088\f
2089
2090/* Read command */
2091static ssize_t
2092st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093{
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
8b05b773 2098 struct st_request *SRpnt = NULL;
1da177e4
LT		 2099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
1da177e4 2103
28f85009 2104 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
b30d8bca 2127 DEB(
1da177e4 2128 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
1da177e4
LT		 2133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
b30d8bca 2179 DEB(
1da177e4 2180 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
1da177e4
LT		 2186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
8b05b773 2225 st_release_request(SRpnt);
1da177e4
LT		 2226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
787926b1 2229 release_buffering(STp, 1);
1da177e4
LT		 2230 STbp->buffer_bytes = 0;
2231 }
28f85009 2232 mutex_unlock(&STp->lock);
1da177e4
LT		 2233
2234 return retval;
2235}
2236\f
2237
2238
2239DEB(
2240/* Set the driver options */
b30d8bca 2241static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
1da177e4
LT		 2242{
2243 if (debugging) {
b30d8bca
HR		 2244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
1da177e4
LT		 2265 }
2266}
2267 )
2268
2269
2270static int st_set_options(struct scsi_tape *STp, long options)
2271{
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
1da177e4 2275 struct cdev *cd0, *cd1;
d6216c47 2276 struct device *d0, *d1;
1da177e4
LT		 2277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
d6216c47
ML		 2280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
1da177e4 2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
d6216c47
ML		 2285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
1da177e4 2289 modes_defined = 1;
b30d8bca
HR		 2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
1da177e4
LT		 2292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
c743e44f 2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
1da177e4 2310 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2311 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4 2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
b30d8bca 2313 st_log_options(STp, STm); )
1da177e4
LT		 2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
c743e44f
LD		 2341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
1da177e4
LT		 2343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
40f6b36c
KM		 2345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
b30d8bca 2347 DEB(
1da177e4
LT		 2348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
b30d8bca 2350 st_log_options(STp, STm); )
1da177e4
LT		 2351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
b30d8bca 2357 DEBC_printk(STp, "Default block size disabled.\n");
1da177e4
LT		 2358 } else {
2359 STm->default_blksize = value;
b30d8bca
HR		 2360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
1da177e4
LT		 2362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
b30d8bca
HR		 2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
1da177e4 2373 } else {
a02488ed
JB		 2374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
b30d8bca
HR		 2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
1da177e4
LT		 2378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
832151f4
RK		 2382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
1da177e4
LT		 2384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
b30d8bca
HR		 2388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
1da177e4
LT		 2391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
b30d8bca
HR		 2397 DEBC_printk(STp,
2398 "Density default disabled.\n");
1da177e4
LT		 2399 } else {
2400 STm->default_density = value & 0xff;
b30d8bca
HR		 2401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
1da177e4
LT		 2403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
b30d8bca
HR		 2411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
1da177e4
LT		 2413 } else {
2414 STp->default_drvbuffer = value & 7;
b30d8bca
HR		 2415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
1da177e4
LT		 2418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
b30d8bca
HR		 2424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
1da177e4
LT		 2426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
b30d8bca
HR		 2429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
1da177e4
LT		 2432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
b30d8bca
HR		 2435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
1da177e4
LT		 2438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449}
2450\f
2451#define MODE_HEADER_LENGTH 4
2452
2453/* Mode header and page byte offsets */
2454#define MH_OFF_DATA_LENGTH 0
2455#define MH_OFF_MEDIUM_TYPE 1
2456#define MH_OFF_DEV_SPECIFIC 2
2457#define MH_OFF_BDESCS_LENGTH 3
2458#define MP_OFF_PAGE_NBR 0
2459#define MP_OFF_PAGE_LENGTH 1
2460
2461/* Mode header and page bit masks */
2462#define MH_BIT_WP 0x80
2463#define MP_MSK_PAGE_NBR 0x3f
2464
2465/* Don't return block descriptors */
2466#define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468#define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470/* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474{
2475 unsigned char cmd[MAX_COMMAND_SIZE];
8ecf0d99 2476 struct st_request *SRpnt;
1da177e4
LT		 2477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
02ae2c0e
KM		 2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
1da177e4 2489
8b05b773 2490 st_release_request(SRpnt);
1da177e4 2491
02ae2c0e 2492 return STp->buffer->syscall_result;
1da177e4
LT		 2493}
2494
2495
2496/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499{
02ae2c0e 2500 int pgo;
1da177e4 2501 unsigned char cmd[MAX_COMMAND_SIZE];
18c87015 2502 struct st_request *SRpnt;
02ae2c0e 2503 int timeout;
1da177e4
LT		 2504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
02ae2c0e
KM		 2517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
1da177e4 2523
8b05b773 2524 st_release_request(SRpnt);
1da177e4 2525
02ae2c0e 2526 return STp->buffer->syscall_result;
1da177e4
LT		 2527}
2528
2529
2530#define COMPRESSION_PAGE 0x0f
2531#define COMPRESSION_PAGE_LENGTH 16
2532
2533#define CP_OFF_DCE_DCC 2
2534#define CP_OFF_C_ALGO 7
2535
2536#define DCE_MASK 0x80
2537#define DCC_MASK 0x40
2538#define RED_MASK 0x60
2539
2540
2541/* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547static int st_compression(struct scsi_tape * STp, int state)
2548{
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
1da177e4
LT		 2552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
b30d8bca 2559 DEBC_printk(STp, "Compression mode page not supported.\n");
1da177e4
LT		 2560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 2564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
1da177e4
LT		 2566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
b30d8bca 2569 DEBC_printk(STp, "Compression not supported.\n");
1da177e4
LT		 2570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
b30d8bca 2587 DEBC_printk(STp, "Compression change failed.\n");
1da177e4
LT		 2588 return (-EIO);
2589 }
b30d8bca 2590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
1da177e4
LT		 2591
2592 STp->compression_changed = 1;
2593 return 0;
2594}
2595
2596
2597/* Process the load and unload commands (does unload if the load code is zero) */
2598static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599{
2600 int retval = (-EIO), timeout;
1da177e4
LT		 2601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
8b05b773 2603 struct st_request *SRpnt;
1da177e4
LT		 2604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
b30d8bca
HR		 2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
1da177e4
LT		 2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2628 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
b30d8bca 2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
1da177e4 2636 else
b30d8bca 2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
1da177e4
LT		 2638 );
2639
02ae2c0e
KM		 2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
1da177e4 2642 if (!SRpnt)
02ae2c0e 2643 return (STp->buffer)->syscall_result;
1da177e4
LT		 2644
2645 retval = (STp->buffer)->syscall_result;
02ae2c0e 2646 st_release_request(SRpnt);
1da177e4
LT		 2647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667}
2668\f
2669#if DEBUG
2670#define ST_DEB_FORWARD 0
2671#define ST_DEB_BACKWARD 1
b30d8bca 2672static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
1da177e4
LT		 2673{
2674 s32 sc;
2675
b30d8bca
HR		 2676 if (!debugging)
2677 return;
2678
1da177e4
LT		 2679 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2681 if (direction)
2682 sc = -sc;
b30d8bca
HR		 2683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2684 direction ? "backward" : "forward", sc, units);
1da177e4 2685}
b30d8bca
HR		 2686#else
2687#define ST_DEB_FORWARD 0
2688#define ST_DEB_BACKWARD 1
2689static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2690#endif
2691
2692
2693/* Internal ioctl function */
2694static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2695{
2696 int timeout;
2697 long ltmp;
2698 int ioctl_result;
2699 int chg_eof = 1;
2700 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2701 struct st_request *SRpnt;
1da177e4
LT		 2702 struct st_partstat *STps;
2703 int fileno, blkno, at_sm, undone;
2704 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2705
2706 WARN_ON(STp->buffer->do_dio != 0);
2707 if (STp->ready != ST_READY) {
2708 if (STp->ready == ST_NO_TAPE)
2709 return (-ENOMEDIUM);
2710 else
2711 return (-EIO);
2712 }
2713 timeout = STp->long_timeout;
2714 STps = &(STp->ps[STp->partition]);
2715 fileno = STps->drv_file;
2716 blkno = STps->drv_block;
2717 at_sm = STps->at_sm;
2718
2719 memset(cmd, 0, MAX_COMMAND_SIZE);
2720 switch (cmd_in) {
2721 case MTFSFM:
2722 chg_eof = 0; /* Changed from the FSF after this */
2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
b30d8bca 2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
2737 case MTBSF:
2738 cmd[0] = SPACE;
2739 cmd[1] = 0x01; /* Space FileMarks */
2740 ltmp = (-arg);
2741 cmd[2] = (ltmp >> 16);
2742 cmd[3] = (ltmp >> 8);
2743 cmd[4] = ltmp;
b30d8bca 2744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2745 if (fileno >= 0)
2746 fileno -= arg;
2747 blkno = (-1); /* We can't know the block number */
2748 at_sm &= (arg == 0);
2749 break;
2750 case MTFSR:
2751 cmd[0] = SPACE;
2752 cmd[1] = 0x00; /* Space Blocks */
2753 cmd[2] = (arg >> 16);
2754 cmd[3] = (arg >> 8);
2755 cmd[4] = arg;
b30d8bca 2756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2757 if (blkno >= 0)
2758 blkno += arg;
2759 at_sm &= (arg == 0);
2760 break;
2761 case MTBSR:
2762 cmd[0] = SPACE;
2763 cmd[1] = 0x00; /* Space Blocks */
2764 ltmp = (-arg);
2765 cmd[2] = (ltmp >> 16);
2766 cmd[3] = (ltmp >> 8);
2767 cmd[4] = ltmp;
b30d8bca 2768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2769 if (blkno >= 0)
2770 blkno -= arg;
2771 at_sm &= (arg == 0);
2772 break;
2773 case MTFSS:
2774 cmd[0] = SPACE;
2775 cmd[1] = 0x04; /* Space Setmarks */
2776 cmd[2] = (arg >> 16);
2777 cmd[3] = (arg >> 8);
2778 cmd[4] = arg;
b30d8bca 2779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2780 if (arg != 0) {
2781 blkno = fileno = (-1);
2782 at_sm = 1;
2783 }
2784 break;
2785 case MTBSS:
2786 cmd[0] = SPACE;
2787 cmd[1] = 0x04; /* Space Setmarks */
2788 ltmp = (-arg);
2789 cmd[2] = (ltmp >> 16);
2790 cmd[3] = (ltmp >> 8);
2791 cmd[4] = ltmp;
b30d8bca 2792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2793 if (arg != 0) {
2794 blkno = fileno = (-1);
2795 at_sm = 1;
2796 }
2797 break;
2798 case MTWEOF:
3e51d3c9 2799 case MTWEOFI:
1da177e4
LT		 2800 case MTWSM:
2801 if (STp->write_prot)
2802 return (-EACCES);
2803 cmd[0] = WRITE_FILEMARKS;
2804 if (cmd_in == MTWSM)
2805 cmd[1] = 2;
c743e44f
LD		 2806 if (cmd_in == MTWEOFI ||
2807 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2808 cmd[1] |= 1;
1da177e4
LT		 2809 cmd[2] = (arg >> 16);
2810 cmd[3] = (arg >> 8);
2811 cmd[4] = arg;
a02488ed 2812 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2813 DEBC(
2814 if (cmd_in != MTWSM)
2815 st_printk(ST_DEB_MSG, STp,
2816 "Writing %d filemarks.\n",
2817 cmd[2] * 65536 +
2818 cmd[3] * 256 +
2819 cmd[4]);
2820 else
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d setmarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
1da177e4
LT		 2826 )
2827 if (fileno >= 0)
2828 fileno += arg;
2829 blkno = 0;
2830 at_sm = (cmd_in == MTWSM);
2831 break;
2832 case MTREW:
2833 cmd[0] = REZERO_UNIT;
2834 if (STp->immediate) {
2835 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2836 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2837 }
b30d8bca 2838 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2839 fileno = blkno = at_sm = 0;
2840 break;
2841 case MTNOP:
b30d8bca 2842 DEBC_printk(STp, "No op on tape.\n");
1da177e4
LT		 2843 return 0; /* Should do something ? */
2844 break;
2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2849 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2850 }
2851 cmd[4] = 3;
b30d8bca 2852 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
b30d8bca 2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2881 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
b30d8bca 2886 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2933 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2934 DEBC(
1da177e4 2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
1da177e4 2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
1da177e4 2945 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
02ae2c0e
KM		 2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
02ae2c0e 2960 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2961
2962 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2963 st_release_request(SRpnt);
1da177e4
LT		 2964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
1da177e4
LT		 2977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
3e51d3c9
KM		 2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 2997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
3e51d3c9 3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3014 cmdstatp->have_sense &&
91614c05
KM		 3015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
1da177e4 3026 STps->drv_file = fileno;
1da177e4
LT		 3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
1da2019f 3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3078 st_release_request(SRpnt);
1da177e4
LT		 3079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
8b05b773 3088 st_release_request(SRpnt);
1da177e4
LT		 3089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093}
3094\f
3095
3096/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101{
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3104 struct st_request *SRpnt;
1da177e4
LT		 3105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
02ae2c0e
KM		 3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
1da177e4 3121 if (!SRpnt)
02ae2c0e 3122 return (STp->buffer)->syscall_result;
1da177e4
LT		 3123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
b30d8bca 3128 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
b30d8bca
HR		 3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
1da177e4 3149 }
8b05b773 3150 st_release_request(SRpnt);
1da177e4
LT		 3151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161{
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3167 struct st_request *SRpnt;
1da177e4
LT		 3168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
b30d8bca
HR		 3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
1da177e4
LT		 3176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
b30d8bca
HR		 3189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
1da177e4
LT		 3192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
b30d8bca
HR		 3213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
1da177e4
LT		 3216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3220 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3221 }
3222
02ae2c0e
KM		 3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
1da177e4 3225 if (!SRpnt)
02ae2c0e 3226 return (STp->buffer)->syscall_result;
1da177e4
LT		 3227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
02ae2c0e 3251
8b05b773 3252 st_release_request(SRpnt);
1da177e4
LT		 3253 SRpnt = NULL;
3254
3255 return result;
3256}
3257
3258
3259/* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261static int find_partition(struct scsi_tape *STp)
3262{
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271}
3272
3273
3274/* Change the partition if necessary */
3275static int switch_partition(struct scsi_tape *STp)
3276{
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285}
3286\f
3287/* Functions for reading and writing the medium partition mode page. */
3288
3289#define PART_PAGE 0x11
3290#define PART_PAGE_FIXED_LENGTH 8
3291
3292#define PP_OFF_MAX_ADD_PARTS 2
3293#define PP_OFF_NBR_ADD_PARTS 3
3294#define PP_OFF_FLAGS 4
3295#define PP_OFF_PART_UNITS 6
3296#define PP_OFF_RESERVED 7
3297
3298#define PP_BIT_IDP 0x20
8038e645 3299#define PP_BIT_FDP 0x80
1da177e4 3300#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3301#define PP_MSK_PSUM_UNITS 0x18
3302#define PP_MSK_POFM 0x04
1da177e4
LT		 3303
3304/* Get the number of partitions on the tape. As a side effect reads the
3305 mode page into the tape buffer. */
3306static int nbr_partitions(struct scsi_tape *STp)
3307{
3308 int result;
1da177e4
LT		 3309
3310 if (STp->ready != ST_READY)
3311 return (-EIO);
3312
3313 result = read_mode_page(STp, PART_PAGE, 1);
3314
3315 if (result) {
b30d8bca 3316 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3317 result = (-EIO);
3318 } else {
3319 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3320 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3321 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3322 }
3323
3324 return result;
3325}
3326
3327
8038e645
KM		 3328static int format_medium(struct scsi_tape *STp, int format)
3329{
3330 int result = 0;
3331 int timeout = STp->long_timeout;
3332 unsigned char scmd[MAX_COMMAND_SIZE];
3333 struct st_request *SRpnt;
3334
3335 memset(scmd, 0, MAX_COMMAND_SIZE);
3336 scmd[0] = FORMAT_UNIT;
3337 scmd[2] = format;
3338 if (STp->immediate) {
3339 scmd[1] |= 1; /* Don't wait for completion */
3340 timeout = STp->device->request_queue->rq_timeout;
3341 }
3342 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3343 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3344 timeout, MAX_RETRIES, 1);
3345 if (!SRpnt)
3346 result = STp->buffer->syscall_result;
3347 return result;
3348}
3349
3350
1da177e4
LT		 3351/* Partition the tape into two partitions if size > 0 or one partition if
3352 size == 0.
3353
3354 The block descriptors are read and written because Sony SDT-7000 does not
3355 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3356
3357 My HP C1533A drive returns only one partition size field. This is used to
3358 set the size of partition 1. There is no size field for the default partition.
3359 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3360 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3361 The following algorithm is used to accommodate both drives: if the number of
3362 partition size fields is greater than the maximum number of additional partitions
3363 in the mode page, the second field is used. Otherwise the first field is used.
3364
3365 For Seagate DDS drives the page length must be 8 when no partitions is defined
3366 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3367 is acceptable also to some other old drives and enforced if the first partition
3368 size field is used for the first additional partition size.
8038e645
KM		 3369
3370 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3371 */
3372static int partition_tape(struct scsi_tape *STp, int size)
3373{
1da177e4 3374 int result;
8038e645
KM		 3375 int target_partition;
3376 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3377 int pgo, psd_cnt, psdo;
8038e645 3378 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3379 unsigned char *bp;
3380
3381 result = read_mode_page(STp, PART_PAGE, 0);
3382 if (result) {
b30d8bca 3383 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3384 return result;
3385 }
8038e645
KM		 3386 target_partition = 1;
3387 if (size < 0) {
3388 target_partition = 0;
3389 size = -size;
3390 }
3391
1da177e4
LT		 3392 /* The mode page is in the buffer. Let's modify it and write it. */
3393 bp = (STp->buffer)->b_data;
3394 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3395 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3396 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3397
3398 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3399
3400 if (scsi3) {
3401 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3402 if (needs_format && size == 0) {
3403 /* No need to write the mode page when clearing
3404 * partitioning
3405 */
3406 DEBC_printk(STp, "Formatting tape with one partition.\n");
3407 result = format_medium(STp, 0);
3408 goto out;
3409 }
3410 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3411 psd_cnt = 2;
3412 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3413 /* Use units scaling for large partitions if the device
3414 * suggests it and no precision lost. Required for IBM
3415 * TS1140/50 drives that don't support MB units.
3416 */
3417 if (size >= 1000 && (size % 1000) == 0) {
3418 size /= 1000;
3419 psum = PP_MSK_PSUM_UNITS;
3420 units = 9; /* GB */
3421 }
3422 }
3423 /* Try it anyway if too large to specify in MB */
3424 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3425 size /= 1000;
3426 psum = PP_MSK_PSUM_UNITS;
3427 units = 9; /* GB */
3428 }
3429 }
3430
3431 if (size >= 65535 || /* Does not fit into two bytes */
3432 (target_partition == 0 && psd_cnt < 2)) {
3433 result = -EINVAL;
3434 goto out;
3435 }
3436
1da177e4 3437 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3438 /* The second condition is for HP DDS which use only one partition size
3439 * descriptor
3440 */
3441 if (target_partition > 0 &&
3442 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3443 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3444 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3445 psdo += 2;
3446 }
3447 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3448
b30d8bca 3449 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3450 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3451 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3452
8038e645 3453 if (size == 0) {
1da177e4
LT		 3454 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3455 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3456 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3457 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3458 } else {
3459 bp[psdo] = (size >> 8) & 0xff;
3460 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3461 if (target_partition == 0)
3462 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3463 bp[pgo + 3] = 1;
3464 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3465 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3466 DEBC_printk(STp,
3467 "Formatting tape with two partitions (%i = %d MB).\n",
3468 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3469 }
3470 bp[pgo + PP_OFF_PART_UNITS] = 0;
3471 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3472 if (size != 1 || units != 0) {
3473 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3474 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3475 bp[pgo + PP_OFF_PART_UNITS] = units;
3476 } else
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3479 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3480
3481 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3482
3483 if (!result && needs_format)
3484 result = format_medium(STp, 1);
3485
1da177e4 3486 if (result) {
b30d8bca 3487 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3488 result = (-EIO);
3489 }
3490
8038e645 3491out:
1da177e4
LT		 3492 return result;
3493}
3494\f
3495
3496
3497/* The ioctl command */
fd66c1b4 3498static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 3499{
3500 int i, cmd_nr, cmd_type, bt;
3501 int retval = 0;
3502 unsigned int blk;
3503 struct scsi_tape *STp = file->private_data;
3504 struct st_modedef *STm;
3505 struct st_partstat *STps;
1da177e4
LT		 3506 void __user *p = (void __user *)arg;
3507
28f85009 3508 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3509 return -ERESTARTSYS;
3510
b30d8bca 3511 DEB(
1da177e4 3512 if (debugging && !STp->in_use) {
b30d8bca 3513 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3514 retval = (-EIO);
3515 goto out;
3516 } ) /* end DEB */
3517
3518 STm = &(STp->modes[STp->current_mode]);
3519 STps = &(STp->ps[STp->partition]);
3520
3521 /*
3522 * If we are in the middle of error recovery, don't let anyone
3523 * else try and use this device. Also, if error recovery fails, it
3524 * may try and take the device offline, in which case all further
3525 * access to the device is prohibited.
3526 */
906d15fb
CH		 3527 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3528 file->f_flags & O_NDELAY);
3529 if (retval)
1da177e4 3530 goto out;
1da177e4
LT		 3531
3532 cmd_type = _IOC_TYPE(cmd_in);
3533 cmd_nr = _IOC_NR(cmd_in);
3534
3535 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3536 struct mtop mtc;
3537
3538 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3539 retval = (-EINVAL);
3540 goto out;
3541 }
3542
3543 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3544 if (i) {
3545 retval = (-EFAULT);
3546 goto out;
3547 }
3548
3549 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3550 st_printk(KERN_WARNING, STp,
3551 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3552 retval = (-EPERM);
3553 goto out;
3554 }
3555 if (!STm->defined &&
3556 (mtc.mt_op != MTSETDRVBUFFER &&
3557 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3558 retval = (-ENXIO);
3559 goto out;
3560 }
3561
3562 if (!STp->pos_unknown) {
3563
3564 if (STps->eof == ST_FM_HIT) {
3565 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3566 mtc.mt_op == MTEOM) {
3567 mtc.mt_count -= 1;
3568 if (STps->drv_file >= 0)
3569 STps->drv_file += 1;
3570 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3571 mtc.mt_count += 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 }
3575 }
3576
3577 if (mtc.mt_op == MTSEEK) {
3578 /* Old position must be restored if partition will be
3579 changed */
3580 i = !STp->can_partitions ||
3581 (STp->new_partition != STp->partition);
3582 } else {
3583 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3584 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3585 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3586 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3587 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3588 mtc.mt_op == MTCOMPRESSION;
3589 }
3590 i = flush_buffer(STp, i);
3591 if (i < 0) {
3592 retval = i;
3593 goto out;
3594 }
3595 if (STps->rw == ST_WRITING &&
3596 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3597 mtc.mt_op == MTSEEK ||
3598 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3599 i = st_int_ioctl(STp, MTWEOF, 1);
3600 if (i < 0) {
3601 retval = i;
3602 goto out;
3603 }
3604 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3605 mtc.mt_count++;
3606 STps->rw = ST_IDLE;
3607 }
3608
3609 } else {
3610 /*
3611 * If there was a bus reset, block further access
3612 * to this device. If the user wants to rewind the tape,
3613 * then reset the flag and allow access again.
3614 */
3615 if (mtc.mt_op != MTREW &&
3616 mtc.mt_op != MTOFFL &&
3617 mtc.mt_op != MTRETEN &&
3618 mtc.mt_op != MTERASE &&
3619 mtc.mt_op != MTSEEK &&
3620 mtc.mt_op != MTEOM) {
3621 retval = (-EIO);
3622 goto out;
3623 }
3624 reset_state(STp);
3625 /* remove this when the midlevel properly clears was_reset */
3626 STp->device->was_reset = 0;
3627 }
3628
3629 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3630 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3631 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3632 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3633
3634 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3635 do_door_lock(STp, 0); /* Ignore result! */
3636
3637 if (mtc.mt_op == MTSETDRVBUFFER &&
3638 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3639 retval = st_set_options(STp, mtc.mt_count);
3640 goto out;
3641 }
3642
3643 if (mtc.mt_op == MTSETPART) {
3644 if (!STp->can_partitions ||
3645 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3646 retval = (-EINVAL);
3647 goto out;
3648 }
3649 if (mtc.mt_count >= STp->nbr_partitions &&
3650 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3651 retval = (-EIO);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions) {
3655 retval = (-EINVAL);
3656 goto out;
3657 }
3658 STp->new_partition = mtc.mt_count;
3659 retval = 0;
3660 goto out;
3661 }
3662
3663 if (mtc.mt_op == MTMKPART) {
3664 if (!STp->can_partitions) {
3665 retval = (-EINVAL);
3666 goto out;
3667 }
8038e645
KM		 3668 i = do_load_unload(STp, file, 1);
3669 if (i < 0) {
3670 retval = i;
3671 goto out;
3672 }
3673 i = partition_tape(STp, mtc.mt_count);
3674 if (i < 0) {
1da177e4
LT		 3675 retval = i;
3676 goto out;
3677 }
3678 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3679 STp->ps[i].rw = ST_IDLE;
3680 STp->ps[i].at_sm = 0;
3681 STp->ps[i].last_block_valid = 0;
3682 }
3683 STp->partition = STp->new_partition = 0;
8038e645 3684 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3685 STps->drv_block = STps->drv_file = 0;
3686 retval = 0;
3687 goto out;
3688 }
3689
3690 if (mtc.mt_op == MTSEEK) {
3691 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3692 if (!STp->can_partitions)
3693 STp->ps[0].rw = ST_IDLE;
3694 retval = i;
3695 goto out;
3696 }
3697
3698 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3699 retval = do_load_unload(STp, file, 0);
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTLOAD) {
3704 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3709 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3710 goto out;
3711 }
3712
3713 if (STp->can_partitions && STp->ready == ST_READY &&
3714 (i = switch_partition(STp)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718
3719 if (mtc.mt_op == MTCOMPRESSION)
3720 retval = st_compression(STp, (mtc.mt_count & 1));
3721 else
3722 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3723 goto out;
3724 }
3725 if (!STm->defined) {
3726 retval = (-ENXIO);
3727 goto out;
3728 }
3729
3730 if ((i = flush_buffer(STp, 0)) < 0) {
3731 retval = i;
3732 goto out;
3733 }
3734 if (STp->can_partitions &&
3735 (i = switch_partition(STp)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739
3740 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3741 struct mtget mt_status;
3742
3743 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3744 retval = (-EINVAL);
3745 goto out;
3746 }
3747
3748 mt_status.mt_type = STp->tape_type;
3749 mt_status.mt_dsreg =
3750 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3751 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3752 mt_status.mt_blkno = STps->drv_block;
3753 mt_status.mt_fileno = STps->drv_file;
3754 if (STp->block_size != 0) {
3755 if (STps->rw == ST_WRITING)
3756 mt_status.mt_blkno +=
3757 (STp->buffer)->buffer_bytes / STp->block_size;
3758 else if (STps->rw == ST_READING)
3759 mt_status.mt_blkno -=
3760 ((STp->buffer)->buffer_bytes +
3761 STp->block_size - 1) / STp->block_size;
3762 }
3763
3764 mt_status.mt_gstat = 0;
3765 if (STp->drv_write_prot)
3766 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3767 if (mt_status.mt_blkno == 0) {
3768 if (mt_status.mt_fileno == 0)
3769 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3770 else
3771 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3772 }
3773 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3774 mt_status.mt_resid = STp->partition;
3775 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3776 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3777 else if (STps->eof >= ST_EOM_OK)
3778 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3779 if (STp->density == 1)
3780 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3781 else if (STp->density == 2)
3782 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3783 else if (STp->density == 3)
3784 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3785 if (STp->ready == ST_READY)
3786 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3787 if (STp->ready == ST_NO_TAPE)
3788 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3789 if (STps->at_sm)
3790 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3791 if (STm->do_async_writes ||
3792 (STm->do_buffer_writes && STp->block_size != 0) ||
3793 STp->drv_buffer != 0)
3794 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3795 if (STp->cleaning_req)
3796 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3797
3798 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3799 if (i) {
3800 retval = (-EFAULT);
3801 goto out;
3802 }
3803
3804 STp->recover_reg = 0; /* Clear after read */
3805 retval = 0;
3806 goto out;
3807 } /* End of MTIOCGET */
3808 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3809 struct mtpos mt_pos;
3810 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3811 retval = (-EINVAL);
3812 goto out;
3813 }
3814 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3815 retval = i;
3816 goto out;
3817 }
3818 mt_pos.mt_blkno = blk;
3819 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3820 if (i)
3821 retval = (-EFAULT);
3822 goto out;
3823 }
28f85009 3824 mutex_unlock(&STp->lock);
1da177e4
LT		 3825 switch (cmd_in) {
3826 case SCSI_IOCTL_GET_IDLUN:
3827 case SCSI_IOCTL_GET_BUS_NUMBER:
3828 break;
3829 default:
16c4b3e2
KM		 3830 if ((cmd_in == SG_IO ||
3831 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3832 cmd_in == CDROM_SEND_PACKET) &&
3833 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3834 i = -EPERM;
3835 else
74f3c8af
AV		 3836 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3837 file->f_mode, cmd_in, p);
1da177e4
LT		 3838 if (i != -ENOTTY)
3839 return i;
3840 break;
3841 }
16c4b3e2
KM		 3842 retval = scsi_ioctl(STp->device, cmd_in, p);
3843 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3844 STp->rew_at_close = 0;
3845 STp->ready = ST_NO_TAPE;
3846 }
3847 return retval;
1da177e4
LT		 3848
3849 out:
28f85009 3850 mutex_unlock(&STp->lock);
1da177e4
LT		 3851 return retval;
3852}
3853
3854#ifdef CONFIG_COMPAT
3855static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3856{
3857 struct scsi_tape *STp = file->private_data;
3858 struct scsi_device *sdev = STp->device;
3859 int ret = -ENOIOCTLCMD;
3860 if (sdev->host->hostt->compat_ioctl) {
3861
3862 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3863
3864 }
3865 return ret;
3866}
3867#endif
3868
3869\f
3870
3871/* Try to allocate a new tape buffer. Calling function must not hold
3872 dev_arr_lock. */
f409d6cc 3873static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
1da177e4 3874{
1da177e4
LT		 3875 struct st_buffer *tb;
3876
f409d6cc 3877 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
1da177e4
LT		 3878 if (!tb) {
3879 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3880 return NULL;
3881 }
1ac63cf5 3882 tb->frp_segs = 0;
1da177e4 3883 tb->use_sg = max_sg;
1da177e4 3884 tb->dma = need_dma;
f409d6cc 3885 tb->buffer_size = 0;
1da177e4 3886
f409d6cc
FT		 3887 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3888 GFP_ATOMIC);
d0e1ae31
FT		 3889 if (!tb->reserved_pages) {
3890 kfree(tb);
3891 return NULL;
3892 }
3893
1da177e4
LT		 3894 return tb;
3895}
3896
3897
3898/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3899#define ST_MAX_ORDER 6
3900
1da177e4
LT		 3901static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3902{
769989a4 3903 int segs, max_segs, b_size, order, got;
c53033f6 3904 gfp_t priority;
1da177e4
LT		 3905
3906 if (new_size <= STbuffer->buffer_size)
3907 return 1;
3908
3909 if (STbuffer->buffer_size <= PAGE_SIZE)
3910 normalize_buffer(STbuffer); /* Avoid extra segment */
3911
3912 max_segs = STbuffer->use_sg;
1da177e4
LT		 3913
3914 priority = GFP_KERNEL | __GFP_NOWARN;
3915 if (need_dma)
3916 priority |= GFP_DMA;
9c905966 3917
08c95832
FT		 3918 if (STbuffer->cleared)
3919 priority |= __GFP_ZERO;
3920
9c905966 3921 if (STbuffer->frp_segs) {
c982c368 3922 order = STbuffer->reserved_page_order;
08c95832 3923 b_size = PAGE_SIZE << order;
9c905966
FT		 3924 } else {
3925 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3926 order < ST_MAX_ORDER &&
3927 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3928 order++, b_size *= 2)
9c905966 3929 ; /* empty */
373daacf 3930 STbuffer->reserved_page_order = order;
9c905966 3931 }
8f78fc5e
KM		 3932 if (max_segs * (PAGE_SIZE << order) < new_size) {
3933 if (order == ST_MAX_ORDER)
3934 return 0;
3935 normalize_buffer(STbuffer);
3936 return enlarge_buffer(STbuffer, new_size, need_dma);
3937 }
1da177e4
LT		 3938
3939 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3940 segs < max_segs && got < new_size;) {
08c95832
FT		 3941 struct page *page;
3942
3943 page = alloc_pages(priority, order);
3944 if (!page) {
1da177e4
LT		 3945 DEB(STbuffer->buffer_size = got);
3946 normalize_buffer(STbuffer);
3947 return 0;
3948 }
08c95832 3949
1da177e4
LT		 3950 STbuffer->frp_segs += 1;
3951 got += b_size;
3952 STbuffer->buffer_size = got;
08c95832 3953 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3954 segs++;
3955 }
08c95832 3956 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3957
3958 return 1;
3959}
3960
3961
40f6b36c
KM		 3962/* Make sure that no data from previous user is in the internal buffer */
3963static void clear_buffer(struct st_buffer * st_bp)
3964{
3965 int i;
3966
3967 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3968 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3969 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3970 st_bp->cleared = 1;
3971}
3972
3973
1da177e4
LT		 3974/* Release the extra buffer */
3975static void normalize_buffer(struct st_buffer * STbuffer)
3976{
c982c368 3977 int i, order = STbuffer->reserved_page_order;
1da177e4 3978
1ac63cf5 3979 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3980 __free_pages(STbuffer->reserved_pages[i], order);
3981 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3982 }
1ac63cf5 3983 STbuffer->frp_segs = 0;
8b05b773 3984 STbuffer->sg_segs = 0;
c982c368 3985 STbuffer->reserved_page_order = 0;
d0e1ae31 3986 STbuffer->map_data.offset = 0;
1da177e4
LT		 3987}
3988
3989
3990/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3991 negative error code. */
3992static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3993{
3994 int i, cnt, res, offset;
c982c368 3995 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 3996
3997 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 3998 i < st_bp->frp_segs && offset >= length; i++)
3999 offset -= length;
1da177e4
LT		 4000 if (i == st_bp->frp_segs) { /* Should never happen */
4001 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4002 return (-EIO);
4003 }
4004 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4005 struct page *page = st_bp->reserved_pages[i];
4006 cnt = length - offset < do_count ? length - offset : do_count;
4007 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4008 if (res)
4009 return (-EFAULT);
4010 do_count -= cnt;
4011 st_bp->buffer_bytes += cnt;
4012 ubp += cnt;
4013 offset = 0;
4014 }
4015 if (do_count) /* Should never happen */
4016 return (-EIO);
4017
4018 return 0;
4019}
4020
4021
4022/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4023 negative error code. */
4024static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4025{
4026 int i, cnt, res, offset;
c982c368 4027 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4028
4029 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4030 i < st_bp->frp_segs && offset >= length; i++)
4031 offset -= length;
1da177e4
LT		 4032 if (i == st_bp->frp_segs) { /* Should never happen */
4033 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4034 return (-EIO);
4035 }
4036 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4037 struct page *page = st_bp->reserved_pages[i];
4038 cnt = length - offset < do_count ? length - offset : do_count;
4039 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4040 if (res)
4041 return (-EFAULT);
4042 do_count -= cnt;
4043 st_bp->buffer_bytes -= cnt;
4044 st_bp->read_pointer += cnt;
4045 ubp += cnt;
4046 offset = 0;
4047 }
4048 if (do_count) /* Should never happen */
4049 return (-EIO);
4050
4051 return 0;
4052}
4053
4054
4055/* Move data towards start of buffer */
4056static void move_buffer_data(struct st_buffer * st_bp, int offset)
4057{
4058 int src_seg, dst_seg, src_offset = 0, dst_offset;
4059 int count, total;
c982c368 4060 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4061
4062 if (offset == 0)
4063 return;
4064
4065 total=st_bp->buffer_bytes - offset;
4066 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4067 src_offset = offset;
08c95832 4068 if (src_offset < length)
1da177e4 4069 break;
08c95832 4070 offset -= length;
1da177e4
LT		 4071 }
4072
4073 st_bp->buffer_bytes = st_bp->read_pointer = total;
4074 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4075 struct page *dpage = st_bp->reserved_pages[dst_seg];
4076 struct page *spage = st_bp->reserved_pages[src_seg];
4077
4078 count = min(length - dst_offset, length - src_offset);
4079 memmove(page_address(dpage) + dst_offset,
4080 page_address(spage) + src_offset, count);
1da177e4 4081 src_offset += count;
08c95832 4082 if (src_offset >= length) {
1da177e4
LT		 4083 src_seg++;
4084 src_offset = 0;
4085 }
4086 dst_offset += count;
08c95832 4087 if (dst_offset >= length) {
1da177e4
LT		 4088 dst_seg++;
4089 dst_offset = 0;
4090 }
4091 total -= count;
4092 }
4093}
4094
1da177e4
LT		 4095/* Validate the options from command line or module parameters */
4096static void validate_options(void)
4097{
4098 if (buffer_kbs > 0)
4099 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4100 if (max_sg_segs >= ST_FIRST_SG)
4101 st_max_sg_segs = max_sg_segs;
4102}
4103
4104#ifndef MODULE
4105/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4106 */
4107static int __init st_setup(char *str)
4108{
4109 int i, len, ints[5];
4110 char *stp;
4111
4112 stp = get_options(str, ARRAY_SIZE(ints), ints);
4113
4114 if (ints[0] > 0) {
4115 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4116 if (parms[i].val)
4117 *parms[i].val = ints[i + 1];
4118 } else {
4119 while (stp != NULL) {
4120 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4121 len = strlen(parms[i].name);
4122 if (!strncmp(stp, parms[i].name, len) &&
4123 (*(stp + len) == ':' || *(stp + len) == '=')) {
4124 if (parms[i].val)
4125 *parms[i].val =
4126 simple_strtoul(stp + len + 1, NULL, 0);
4127 else
4128 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4129 parms[i].name);
4130 break;
4131 }
4132 }
6391a113 4133 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4134 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4135 stp);
4136 stp = strchr(stp, ',');
4137 if (stp)
4138 stp++;
4139 }
4140 }
4141
4142 validate_options();
4143
4144 return 1;
4145}
4146
4147__setup("st=", st_setup);
4148
4149#endif
4150
00977a59 4151static const struct file_operations st_fops =
1da177e4
LT		 4152{
4153 .owner = THIS_MODULE,
4154 .read = st_read,
4155 .write = st_write,
fd66c1b4 4156 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4157#ifdef CONFIG_COMPAT
4158 .compat_ioctl = st_compat_ioctl,
4159#endif
4160 .open = st_open,
4161 .flush = st_flush,
4162 .release = st_release,
b4d878e2 4163 .llseek = noop_llseek,
1da177e4
LT		 4164};
4165
26898afd
JM		 4166static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4167{
4168 int i, error;
4169 dev_t cdev_devno;
4170 struct cdev *cdev;
4171 struct device *dev;
4172 struct st_modedef *STm = &(tape->modes[mode]);
4173 char name[10];
4174 int dev_num = tape->index;
4175
4176 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4177
4178 cdev = cdev_alloc();
4179 if (!cdev) {
4180 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4181 error = -ENOMEM;
4182 goto out;
4183 }
4184 cdev->owner = THIS_MODULE;
4185 cdev->ops = &st_fops;
ab08ee14 4186 STm->cdevs[rew] = cdev;
26898afd
JM		 4187
4188 error = cdev_add(cdev, cdev_devno, 1);
4189 if (error) {
4190 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4191 rew ? "non" : "auto", mode);
4192 pr_err("st%d: Device not attached.\n", dev_num);
4193 goto out_free;
4194 }
26898afd
JM		 4195
4196 i = mode << (4 - ST_NBR_MODE_BITS);
4197 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4198 tape->disk->disk_name, st_formats[i]);
4199
4200 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4201 cdev_devno, &tape->modes[mode], "%s", name);
4202 if (IS_ERR(dev)) {
4203 pr_err("st%d: device_create failed\n", dev_num);
4204 error = PTR_ERR(dev);
4205 goto out_free;
4206 }
4207
4208 STm->devs[rew] = dev;
4209
4210 return 0;
4211out_free:
4212 cdev_del(STm->cdevs[rew]);
26898afd 4213out:
ab08ee14
ML		 4214 STm->cdevs[rew] = NULL;
4215 STm->devs[rew] = NULL;
26898afd
JM		 4216 return error;
4217}
4218
4219static int create_cdevs(struct scsi_tape *tape)
4220{
4221 int mode, error;
4222 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4223 error = create_one_cdev(tape, mode, 0);
4224 if (error)
4225 return error;
4226 error = create_one_cdev(tape, mode, 1);
4227 if (error)
4228 return error;
4229 }
4230
4231 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4232 &tape->modes[0].devs[0]->kobj, "tape");
4233}
4234
4235static void remove_cdevs(struct scsi_tape *tape)
4236{
4237 int mode, rew;
4238 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4239 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4240 struct st_modedef *STm = &(tape->modes[mode]);
4241 for (rew = 0; rew < 2; rew++) {
4242 if (STm->cdevs[rew])
4243 cdev_del(STm->cdevs[rew]);
4244 if (STm->devs[rew])
4245 device_unregister(STm->devs[rew]);
4246 }
4247 }
4248}
4249
1da177e4
LT		 4250static int st_probe(struct device *dev)
4251{
4252 struct scsi_device *SDp = to_scsi_device(dev);
4253 struct gendisk *disk = NULL;
1da177e4
LT		 4254 struct scsi_tape *tpnt = NULL;
4255 struct st_modedef *STm;
4256 struct st_partstat *STps;
4257 struct st_buffer *buffer;
b98c52b5 4258 int i, error;
1da177e4 4259 char *stp;
1da177e4
LT		 4260
4261 if (SDp->type != TYPE_TAPE)
4262 return -ENODEV;
4263 if ((stp = st_incompatible(SDp))) {
3bf743e7 4264 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
b30d8bca
HR		 4265 sdev_printk(KERN_INFO, SDp,
4266 "st: The suggested driver is %s.\n", stp);
1da177e4
LT		 4267 return -ENODEV;
4268 }
4269
6fe8c1db 4270 scsi_autopm_get_device(SDp);
8a78362c 4271 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4272 if (st_max_sg_segs < i)
4273 i = st_max_sg_segs;
f409d6cc 4274 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
1da177e4 4275 if (buffer == NULL) {
b30d8bca
HR		 4276 sdev_printk(KERN_ERR, SDp,
4277 "st: Can't allocate new tape buffer. "
4278 "Device not attached.\n");
1da177e4
LT		 4279 goto out;
4280 }
4281
4282 disk = alloc_disk(1);
4283 if (!disk) {
b30d8bca
HR		 4284 sdev_printk(KERN_ERR, SDp,
4285 "st: out of memory. Device not attached.\n");
1da177e4
LT		 4286 goto out_buffer_free;
4287 }
4288
24669f75 4289 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
1da177e4 4290 if (tpnt == NULL) {
b30d8bca
HR		 4291 sdev_printk(KERN_ERR, SDp,
4292 "st: Can't allocate device descriptor.\n");
1da177e4
LT		 4293 goto out_put_disk;
4294 }
f03a5670 4295 kref_init(&tpnt->kref);
1da177e4 4296 tpnt->disk = disk;
1da177e4
LT		 4297 disk->private_data = &tpnt->driver;
4298 disk->queue = SDp->request_queue;
2b5bebcc
JL		 4299 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4300 * take queue reference that release_disk() expects. */
4301 if (!blk_get_queue(disk->queue))
4302 goto out_put_disk;
1da177e4 4303 tpnt->driver = &st_template;
1da177e4
LT		 4304
4305 tpnt->device = SDp;
4306 if (SDp->scsi_level <= 2)
4307 tpnt->tape_type = MT_ISSCSI1;
4308 else
4309 tpnt->tape_type = MT_ISSCSI2;
4310
4311 tpnt->buffer = buffer;
f03a5670 4312 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4313
4314 tpnt->inited = 0;
4315 tpnt->dirty = 0;
4316 tpnt->in_use = 0;
4317 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4318 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4319 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4320 tpnt->density = 0;
4321 tpnt->do_auto_lock = ST_AUTO_LOCK;
4322 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4323 tpnt->can_partitions = 0;
4324 tpnt->two_fm = ST_TWO_FM;
4325 tpnt->fast_mteom = ST_FAST_MTEOM;
4326 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4327 tpnt->sili = ST_SILI;
1da177e4 4328 tpnt->immediate = ST_NOWAIT;
c743e44f 4329 tpnt->immediate_filemark = 0;
1da177e4
LT		 4330 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4331 tpnt->partition = 0;
4332 tpnt->new_partition = 0;
4333 tpnt->nbr_partitions = 0;
a02488ed 4334 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4335 tpnt->long_timeout = ST_LONG_TIMEOUT;
4336 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4337
1da177e4
LT		 4338 for (i = 0; i < ST_NBR_MODES; i++) {
4339 STm = &(tpnt->modes[i]);
4340 STm->defined = 0;
4341 STm->sysv = ST_SYSV;
4342 STm->defaults_for_writes = 0;
4343 STm->do_async_writes = ST_ASYNC_WRITES;
4344 STm->do_buffer_writes = ST_BUFFER_WRITES;
4345 STm->do_read_ahead = ST_READ_AHEAD;
4346 STm->default_compression = ST_DONT_TOUCH;
4347 STm->default_blksize = (-1); /* No forced size */
4348 STm->default_density = (-1); /* No forced density */
6c648d95 4349 STm->tape = tpnt;
1da177e4
LT		 4350 }
4351
4352 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4353 STps = &(tpnt->ps[i]);
4354 STps->rw = ST_IDLE;
4355 STps->eof = ST_NOEOF;
4356 STps->at_sm = 0;
4357 STps->last_block_valid = 0;
4358 STps->drv_block = (-1);
4359 STps->drv_file = (-1);
4360 }
4361
4362 tpnt->current_mode = 0;
4363 tpnt->modes[0].defined = 1;
4364
4365 tpnt->density_changed = tpnt->compression_changed =
4366 tpnt->blksize_changed = 0;
28f85009 4367 mutex_init(&tpnt->lock);
1da177e4 4368
b98c52b5 4369 idr_preload(GFP_KERNEL);
6c648d95 4370 spin_lock(&st_index_lock);
b98c52b5 4371 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4372 spin_unlock(&st_index_lock);
b98c52b5
TH		 4373 idr_preload_end();
4374 if (error < 0) {
6c648d95 4375 pr_warn("st: idr allocation failed: %d\n", error);
2b5bebcc 4376 goto out_put_queue;
6c648d95 4377 }
b98c52b5
TH		 4378 tpnt->index = error;
4379 sprintf(disk->disk_name, "st%d", tpnt->index);
05545c92
SS		 4380 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4381 if (tpnt->stats == NULL) {
4382 sdev_printk(KERN_ERR, SDp,
4383 "st: Can't allocate statistics.\n");
4384 goto out_idr_remove;
4385 }
6c648d95
JM		 4386
4387 dev_set_drvdata(dev, tpnt);
1da177e4 4388
1da177e4 4389
26898afd
JM		 4390 error = create_cdevs(tpnt);
4391 if (error)
4392 goto out_remove_devs;
46a243f7 4393 scsi_autopm_put_device(SDp);
1da177e4 4394
42252854 4395 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4396 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4397 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4398 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4399 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4400
4401 return 0;
4402
26898afd
JM		 4403out_remove_devs:
4404 remove_cdevs(tpnt);
05545c92
SS		 4405 kfree(tpnt->stats);
4406out_idr_remove:
6c648d95 4407 spin_lock(&st_index_lock);
b98c52b5 4408 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4409 spin_unlock(&st_index_lock);
2b5bebcc
JL		 4410out_put_queue:
4411 blk_put_queue(disk->queue);
1da177e4
LT		 4412out_put_disk:
4413 put_disk(disk);
c9475cb0 4414 kfree(tpnt);
1da177e4
LT		 4415out_buffer_free:
4416 kfree(buffer);
4417out:
6fe8c1db 4418 scsi_autopm_put_device(SDp);
1da177e4
LT		 4419 return -ENODEV;
4420};
4421
4422
4423static int st_remove(struct device *dev)
4424{
6c648d95 4425 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4426 int index = tpnt->index;
4427
4428 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4429 remove_cdevs(tpnt);
1da177e4 4430
6c648d95
JM		 4431 mutex_lock(&st_ref_mutex);
4432 kref_put(&tpnt->kref, scsi_tape_release);
4433 mutex_unlock(&st_ref_mutex);
4434 spin_lock(&st_index_lock);
4435 idr_remove(&st_index_idr, index);
4436 spin_unlock(&st_index_lock);
1da177e4
LT		 4437 return 0;
4438}
4439
f03a5670
KM		 4440/**
4441 * scsi_tape_release - Called to free the Scsi_Tape structure
4442 * @kref: pointer to embedded kref
4443 *
0b950672 4444 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4445 * called on last put, you should always use the scsi_tape_get()
4446 * scsi_tape_put() helpers which manipulate the semaphore directly
4447 * and never do a direct kref_put().
4448 **/
4449static void scsi_tape_release(struct kref *kref)
4450{
4451 struct scsi_tape *tpnt = to_scsi_tape(kref);
4452 struct gendisk *disk = tpnt->disk;
4453
4454 tpnt->device = NULL;
4455
4456 if (tpnt->buffer) {
f03a5670 4457 normalize_buffer(tpnt->buffer);
d0e1ae31 4458 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4459 kfree(tpnt->buffer);
4460 }
4461
4462 disk->private_data = NULL;
4463 put_disk(disk);
05545c92 4464 kfree(tpnt->stats);
f03a5670
KM		 4465 kfree(tpnt);
4466 return;
4467}
4468
af23782b
JM		 4469static struct class st_sysfs_class = {
4470 .name = "scsi_tape",
c69c6be5 4471 .dev_groups = st_dev_groups,
af23782b
JM		 4472};
4473
1da177e4
LT		 4474static int __init init_st(void)
4475{
13026a6b
JG		 4476 int err;
4477
1da177e4
LT		 4478 validate_options();
4479
13026a6b 4480 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4481 verstr, st_fixed_buffer_size, st_max_sg_segs);
4482
2bec708a
LO		 4483 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4484 if (debugging) {
4485 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4486 debugging);
4487 }
4488
af23782b
JM		 4489 err = class_register(&st_sysfs_class);
4490 if (err) {
4491 pr_err("Unable register sysfs class for SCSI tapes\n");
4492 return err;
1da177e4
LT		 4493 }
4494
13026a6b
JG		 4495 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4496 ST_MAX_TAPE_ENTRIES, "st");
4497 if (err) {
4498 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4499 SCSI_TAPE_MAJOR);
4500 goto err_class;
1da177e4
LT		 4501 }
4502
13026a6b
JG		 4503 err = scsi_register_driver(&st_template.gendrv);
4504 if (err)
4505 goto err_chrdev;
4506
13026a6b
JG		 4507 return 0;
4508
13026a6b
JG		 4509err_chrdev:
4510 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4511 ST_MAX_TAPE_ENTRIES);
4512err_class:
af23782b 4513 class_unregister(&st_sysfs_class);
13026a6b 4514 return err;
1da177e4
LT		 4515}
4516
4517static void __exit exit_st(void)
4518{
1da177e4
LT		 4519 scsi_unregister_driver(&st_template.gendrv);
4520 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4521 ST_MAX_TAPE_ENTRIES);
af23782b 4522 class_unregister(&st_sysfs_class);
2d3a5d21 4523 idr_destroy(&st_index_idr);
1da177e4
LT		 4524 printk(KERN_INFO "st: Unloaded.\n");
4525}
4526
4527module_init(init_st);
4528module_exit(exit_st);
4529
4530
4531/* The sysfs driver interface. Read-only at the moment */
10978e48 4532static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4533{
10978e48 4534 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4535}
10978e48 4536static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4537
10978e48 4538static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4539{
10978e48 4540 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4541}
10978e48 4542static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4543
10978e48 4544static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4545{
10978e48 4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4547}
10978e48 4548static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4549
10978e48 4550static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4551{
10978e48 4552 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4553}
10978e48 4554static DRIVER_ATTR_RO(version);
1da177e4 4555
d9b43a10
SS		 4556#if DEBUG
4557static ssize_t debug_flag_store(struct device_driver *ddp,
4558 const char *buf, size_t count)
4559{
4560/* We only care what the first byte of the data is the rest is unused.
4561 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4562 * other values have -EINVAL returned if they are passed in.
4563 */
4564 if (count > 0) {
4565 if (buf[0] == '0') {
4566 debugging = NO_DEBUG;
4567 return count;
4568 } else if (buf[0] == '1') {
4569 debugging = 1;
4570 return count;
4571 }
4572 }
4573 return -EINVAL;
4574}
4575
4576static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4577{
4578 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4579}
4580static DRIVER_ATTR_RW(debug_flag);
4581#endif
4582
442d7562
SS		 4583static struct attribute *st_drv_attrs[] = {
4584 &driver_attr_try_direct_io.attr,
4585 &driver_attr_fixed_buffer_size.attr,
4586 &driver_attr_max_sg_segs.attr,
4587 &driver_attr_version.attr,
d9b43a10
SS		 4588#if DEBUG
4589 &driver_attr_debug_flag.attr,
4590#endif
442d7562
SS		 4591 NULL,
4592};
4593ATTRIBUTE_GROUPS(st_drv);
1da177e4 4594
1da177e4 4595/* The sysfs simple class interface */
ee959b00 4596static ssize_t
af23782b 4597defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4598{
7d15d6a4 4599 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4600 ssize_t l = 0;
4601
4602 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4603 return l;
4604}
c69c6be5 4605static DEVICE_ATTR_RO(defined);
1da177e4 4606
ee959b00 4607static ssize_t
af23782b
JM		 4608default_blksize_show(struct device *dev, struct device_attribute *attr,
4609 char *buf)
1da177e4 4610{
7d15d6a4 4611 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4612 ssize_t l = 0;
4613
4614 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4615 return l;
4616}
c69c6be5 4617static DEVICE_ATTR_RO(default_blksize);
1da177e4 4618
ee959b00 4619static ssize_t
af23782b
JM		 4620default_density_show(struct device *dev, struct device_attribute *attr,
4621 char *buf)
1da177e4 4622{
7d15d6a4 4623 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4624 ssize_t l = 0;
4625 char *fmt;
4626
4627 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4628 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4629 return l;
4630}
c69c6be5 4631static DEVICE_ATTR_RO(default_density);
1da177e4 4632
ee959b00 4633static ssize_t
af23782b
JM		 4634default_compression_show(struct device *dev, struct device_attribute *attr,
4635 char *buf)
1da177e4 4636{
7d15d6a4 4637 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4638 ssize_t l = 0;
4639
4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4641 return l;
4642}
c69c6be5 4643static DEVICE_ATTR_RO(default_compression);
1da177e4 4644
ee959b00 4645static ssize_t
af23782b 4646options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4647{
7d15d6a4 4648 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4649 struct scsi_tape *STp = STm->tape;
4650 int options;
b174be02
KM		 4651 ssize_t l = 0;
4652
b174be02
KM		 4653 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4654 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4655 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4656 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4657 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4658 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4659 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4660 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4661 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4662 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4663 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4664 options |= STm->sysv ? MT_ST_SYSV : 0;
4665 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4666 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4667 options |= STp->sili ? MT_ST_SILI : 0;
4668
4669 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4670 return l;
4671}
c69c6be5
GKH		 4672static DEVICE_ATTR_RO(options);
4673
05545c92
SS		 4674/* Support for tape stats */
4675
4676/**
4677 * read_cnt_show - return read count - count of reads made from tape drive
4678 * @dev: struct device
4679 * @attr: attribute structure
4680 * @buf: buffer to return formatted data in
4681 */
4682static ssize_t read_cnt_show(struct device *dev,
4683 struct device_attribute *attr, char *buf)
4684{
4685 struct st_modedef *STm = dev_get_drvdata(dev);
4686
4687 return sprintf(buf, "%lld",
4688 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4689}
4690static DEVICE_ATTR_RO(read_cnt);
4691
4692/**
4693 * read_byte_cnt_show - return read byte count - tape drives
4694 * may use blocks less than 512 bytes this gives the raw byte count of
4695 * of data read from the tape drive.
4696 * @dev: struct device
4697 * @attr: attribute structure
4698 * @buf: buffer to return formatted data in
4699 */
4700static ssize_t read_byte_cnt_show(struct device *dev,
4701 struct device_attribute *attr, char *buf)
4702{
4703 struct st_modedef *STm = dev_get_drvdata(dev);
4704
4705 return sprintf(buf, "%lld",
4706 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4707}
4708static DEVICE_ATTR_RO(read_byte_cnt);
4709
4710/**
4711 * read_us_show - return read us - overall time spent waiting on reads in ns.
4712 * @dev: struct device
4713 * @attr: attribute structure
4714 * @buf: buffer to return formatted data in
4715 */
4716static ssize_t read_ns_show(struct device *dev,
4717 struct device_attribute *attr, char *buf)
4718{
4719 struct st_modedef *STm = dev_get_drvdata(dev);
4720
4721 return sprintf(buf, "%lld",
4722 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4723}
4724static DEVICE_ATTR_RO(read_ns);
4725
4726/**
4727 * write_cnt_show - write count - number of user calls
4728 * to write(2) that have written data to tape.
4729 * @dev: struct device
4730 * @attr: attribute structure
4731 * @buf: buffer to return formatted data in
4732 */
4733static ssize_t write_cnt_show(struct device *dev,
4734 struct device_attribute *attr, char *buf)
4735{
4736 struct st_modedef *STm = dev_get_drvdata(dev);
4737
4738 return sprintf(buf, "%lld",
4739 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4740}
4741static DEVICE_ATTR_RO(write_cnt);
4742
4743/**
4744 * write_byte_cnt_show - write byte count - raw count of
4745 * bytes written to tape.
4746 * @dev: struct device
4747 * @attr: attribute structure
4748 * @buf: buffer to return formatted data in
4749 */
4750static ssize_t write_byte_cnt_show(struct device *dev,
4751 struct device_attribute *attr, char *buf)
4752{
4753 struct st_modedef *STm = dev_get_drvdata(dev);
4754
4755 return sprintf(buf, "%lld",
4756 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4757}
4758static DEVICE_ATTR_RO(write_byte_cnt);
4759
4760/**
4761 * write_ns_show - write ns - number of nanoseconds waiting on write
4762 * requests to complete.
4763 * @dev: struct device
4764 * @attr: attribute structure
4765 * @buf: buffer to return formatted data in
4766 */
4767static ssize_t write_ns_show(struct device *dev,
4768 struct device_attribute *attr, char *buf)
4769{
4770 struct st_modedef *STm = dev_get_drvdata(dev);
4771
4772 return sprintf(buf, "%lld",
4773 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4774}
4775static DEVICE_ATTR_RO(write_ns);
4776
4777/**
4778 * in_flight_show - number of I/Os currently in flight -
4779 * in most cases this will be either 0 or 1. It may be higher if someone
4780 * has also issued other SCSI commands such as via an ioctl.
4781 * @dev: struct device
4782 * @attr: attribute structure
4783 * @buf: buffer to return formatted data in
4784 */
4785static ssize_t in_flight_show(struct device *dev,
4786 struct device_attribute *attr, char *buf)
4787{
4788 struct st_modedef *STm = dev_get_drvdata(dev);
4789
4790 return sprintf(buf, "%lld",
4791 (long long)atomic64_read(&STm->tape->stats->in_flight));
4792}
4793static DEVICE_ATTR_RO(in_flight);
4794
4795/**
4796 * io_ns_show - io wait ns - this is the number of ns spent
4797 * waiting on all I/O to complete. This includes tape movement commands
4798 * such as rewinding, seeking to end of file or tape, it also includes
4799 * read and write. To determine the time spent on tape movement
4800 * subtract the read and write ns from this value.
4801 * @dev: struct device
4802 * @attr: attribute structure
4803 * @buf: buffer to return formatted data in
4804 */
4805static ssize_t io_ns_show(struct device *dev,
4806 struct device_attribute *attr, char *buf)
4807{
4808 struct st_modedef *STm = dev_get_drvdata(dev);
4809
4810 return sprintf(buf, "%lld",
4811 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4812}
4813static DEVICE_ATTR_RO(io_ns);
4814
4815/**
4816 * other_cnt_show - other io count - this is the number of
4817 * I/O requests other than read and write requests.
4818 * Typically these are tape movement requests but will include driver
4819 * tape movement. This includes only requests issued by the st driver.
4820 * @dev: struct device
4821 * @attr: attribute structure
4822 * @buf: buffer to return formatted data in
4823 */
4824static ssize_t other_cnt_show(struct device *dev,
4825 struct device_attribute *attr, char *buf)
4826{
4827 struct st_modedef *STm = dev_get_drvdata(dev);
4828
4829 return sprintf(buf, "%lld",
4830 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4831}
4832static DEVICE_ATTR_RO(other_cnt);
4833
4834/**
4835 * resid_cnt_show - A count of the number of times we get a residual
4836 * count - this should indicate someone issuing reads larger than the
4837 * block size on tape.
4838 * @dev: struct device
4839 * @attr: attribute structure
4840 * @buf: buffer to return formatted data in
4841 */
4842static ssize_t resid_cnt_show(struct device *dev,
4843 struct device_attribute *attr, char *buf)
4844{
4845 struct st_modedef *STm = dev_get_drvdata(dev);
4846
4847 return sprintf(buf, "%lld",
4848 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4849}
4850static DEVICE_ATTR_RO(resid_cnt);
4851
c69c6be5
GKH		 4852static struct attribute *st_dev_attrs[] = {
4853 &dev_attr_defined.attr,
4854 &dev_attr_default_blksize.attr,
4855 &dev_attr_default_density.attr,
4856 &dev_attr_default_compression.attr,
4857 &dev_attr_options.attr,
4858 NULL,
af23782b 4859};
05545c92
SS		 4860
4861static struct attribute *st_stats_attrs[] = {
4862 &dev_attr_read_cnt.attr,
4863 &dev_attr_read_byte_cnt.attr,
4864 &dev_attr_read_ns.attr,
4865 &dev_attr_write_cnt.attr,
4866 &dev_attr_write_byte_cnt.attr,
4867 &dev_attr_write_ns.attr,
4868 &dev_attr_in_flight.attr,
4869 &dev_attr_io_ns.attr,
4870 &dev_attr_other_cnt.attr,
4871 &dev_attr_resid_cnt.attr,
4872 NULL,
4873};
4874
4875static struct attribute_group stats_group = {
4876 .name = "stats",
4877 .attrs = st_stats_attrs,
4878};
4879
4880static struct attribute_group st_group = {
4881 .attrs = st_dev_attrs,
4882};
4883
4884static const struct attribute_group *st_dev_groups[] = {
4885 &st_group,
4886 &stats_group,
4887 NULL,
4888};
b174be02 4889
1da177e4 4890/* The following functions may be useful for a larger audience. */
6620742f
FT		 4891static int sgl_map_user_pages(struct st_buffer *STbp,
4892 const unsigned int max_pages, unsigned long uaddr,
4893 size_t count, int rw)
1da177e4 4894{
07542b83
JB		 4895 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4896 unsigned long start = uaddr >> PAGE_SHIFT;
4897 const int nr_pages = end - start;
1da177e4 4898 int res, i, j;
1da177e4 4899 struct page **pages;
6620742f 4900 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4901
1da177e4
LT		 4902 /* User attempted Overflow! */
4903 if ((uaddr + count) < uaddr)
4904 return -EINVAL;
4905
4906 /* Too big */
4907 if (nr_pages > max_pages)
4908 return -ENOMEM;
4909
4910 /* Hmm? */
4911 if (count == 0)
4912 return 0;
4913
4914 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4915 return -ENOMEM;
4916
4917 /* Try to fault in all of the necessary pages */
1da177e4 4918 /* rw==READ means read from drive, write into memory area */
7e339128 4919 res = get_user_pages_unlocked(
1da177e4
LT		 4920 uaddr,
4921 nr_pages,
4922 rw == READ,
4923 0, /* don't force */
7e339128 4924 pages);
1da177e4
LT		 4925
4926 /* Errors and no page mapped should return here */
4927 if (res < nr_pages)
4928 goto out_unmap;
4929
4930 for (i=0; i < nr_pages; i++) {
4931 /* FIXME: flush superflous for rw==READ,
4932 * probably wrong function for rw==WRITE
4933 */
4934 flush_dcache_page(pages[i]);
4935 }
4936
6620742f 4937 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4938 STbp->mapped_pages = pages;
1da177e4 4939
1da177e4 4940 return nr_pages;
1da177e4
LT		 4941 out_unmap:
4942 if (res > 0) {
4943 for (j=0; j < res; j++)
09cbfeaf 4944 put_page(pages[j]);
6bc733e9 4945 res = 0;
1da177e4
LT		 4946 }
4947 kfree(pages);
4948 return res;
4949}
4950
4951
4952/* And unmap them... */
6620742f
FT		 4953static int sgl_unmap_user_pages(struct st_buffer *STbp,
4954 const unsigned int nr_pages, int dirtied)
1da177e4
LT		 4955{
4956 int i;
4957
4958 for (i=0; i < nr_pages; i++) {
6620742f 4959 struct page *page = STbp->mapped_pages[i];
b5810039 4960
b5810039
NP		 4961 if (dirtied)
4962 SetPageDirty(page);
1da177e4
LT		 4963 /* FIXME: cache flush missing for rw==READ
4964 * FIXME: call the correct reference counting function
4965 */
09cbfeaf 4966 put_page(page);
1da177e4 4967 }
6620742f
FT		 4968 kfree(STbp->mapped_pages);
4969 STbp->mapped_pages = NULL;
1da177e4
LT		 4970
4971 return 0;
4972}
Linux 6.x block layer and io_uring tree(s)