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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / st.c
CommitLineData
1da177e4
LT		 1/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
8038e645 12 Copyright 1992 - 2016 Kai Makisara
1da177e4
LT		 13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
8038e645 20static const char *verstr = "20160209";
1da177e4
LT		 21
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
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);
e8064021 549 req->rq_flags |= RQF_QUIET;
13b53b44
FT		 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;
5e4fabb6
KM		 1977 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1978 if (STp->block_size == 0)
1979 transfer = bytes;
1980 /* Some drives set ILI with MEDIUM ERROR */
1981 cmdstatp->flags &= ~SENSE_ILI;
1982 }
1da177e4
LT		 1983
1984 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
b30d8bca
HR		 1985 if (STp->block_size == 0 &&
1986 transfer < 0) {
1987 st_printk(KERN_NOTICE, STp,
1988 "Failed to read %d "
1989 "byte block with %d "
1990 "byte transfer.\n",
1991 bytes - transfer,
1992 bytes);
1993 if (STps->drv_block >= 0)
1994 STps->drv_block += 1;
1995 STbp->buffer_bytes = 0;
1996 return (-ENOMEM);
1997 } else if (STp->block_size == 0) {
1da177e4
LT		 1998 STbp->buffer_bytes = bytes - transfer;
1999 } else {
8b05b773 2000 st_release_request(SRpnt);
1da177e4
LT		 2001 SRpnt = *aSRpnt = NULL;
2002 if (transfer == blks) { /* We did not get anything, error */
b30d8bca
HR		 2003 st_printk(KERN_NOTICE, STp,
2004 "Incorrect "
2005 "block size.\n");
1da177e4
LT		 2006 if (STps->drv_block >= 0)
2007 STps->drv_block += blks - transfer + 1;
2008 st_int_ioctl(STp, MTBSR, 1);
2009 return (-EIO);
2010 }
2011 /* We have some data, deliver it */
2012 STbp->buffer_bytes = (blks - transfer) *
2013 STp->block_size;
b30d8bca
HR		 2014 DEBC_printk(STp, "ILI but "
2015 "enough data "
2016 "received %ld "
2017 "%d.\n", count,
2018 STbp->buffer_bytes);
1da177e4
LT		 2019 if (STps->drv_block >= 0)
2020 STps->drv_block += 1;
2021 if (st_int_ioctl(STp, MTBSR, 1))
2022 return (-EIO);
2023 }
2024 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2025 if (STps->eof != ST_FM_HIT)
2026 STps->eof = ST_FM_HIT;
2027 else
2028 STps->eof = ST_EOD_2;
2029 if (STp->block_size == 0)
2030 STbp->buffer_bytes = 0;
2031 else
2032 STbp->buffer_bytes =
2033 bytes - transfer * STp->block_size;
b30d8bca
HR		 2034 DEBC_printk(STp, "EOF detected (%d "
2035 "bytes read).\n",
2036 STbp->buffer_bytes);
1da177e4
LT		 2037 } else if (cmdstatp->flags & SENSE_EOM) {
2038 if (STps->eof == ST_FM)
2039 STps->eof = ST_EOD_1;
2040 else
2041 STps->eof = ST_EOM_OK;
2042 if (STp->block_size == 0)
2043 STbp->buffer_bytes = bytes - transfer;
2044 else
2045 STbp->buffer_bytes =
2046 bytes - transfer * STp->block_size;
2047
b30d8bca
HR		 2048 DEBC_printk(STp, "EOM detected (%d "
2049 "bytes read).\n",
2050 STbp->buffer_bytes);
1da177e4
LT		 2051 }
2052 }
b30d8bca 2053 /* end of EOF, EOM, ILI test */
1da177e4 2054 else { /* nonzero sense key */
b30d8bca 2055 DEBC_printk(STp, "Tape error while reading.\n");
1da177e4
LT		 2056 STps->drv_block = (-1);
2057 if (STps->eof == ST_FM &&
2058 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
b30d8bca
HR		 2059 DEBC_printk(STp, "Zero returned for "
2060 "first BLANK CHECK "
2061 "after EOF.\n");
1da177e4
LT		 2062 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2063 } else /* Some other extended sense code */
2064 retval = (-EIO);
2065 }
2066
2067 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2068 STbp->buffer_bytes = 0;
2069 }
b30d8bca 2070 /* End of extended sense test */
1da177e4
LT		 2071 else { /* Non-extended sense */
2072 retval = STbp->syscall_result;
2073 }
2074
2075 }
b30d8bca 2076 /* End of error handling */
40f6b36c 2077 else { /* Read successful */
1da177e4 2078 STbp->buffer_bytes = bytes;
40f6b36c
KM		 2079 if (STp->sili) /* In fixed block mode residual is always zero here */
2080 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2081 }
1da177e4
LT		 2082
2083 if (STps->drv_block >= 0) {
2084 if (STp->block_size == 0)
2085 STps->drv_block++;
2086 else
2087 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2088 }
2089 return retval;
2090}
2091\f
2092
2093/* Read command */
2094static ssize_t
2095st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2096{
2097 ssize_t total;
2098 ssize_t retval = 0;
2099 ssize_t i, transfer;
2100 int special, do_dio = 0;
8b05b773 2101 struct st_request *SRpnt = NULL;
1da177e4
LT		 2102 struct scsi_tape *STp = filp->private_data;
2103 struct st_modedef *STm;
2104 struct st_partstat *STps;
2105 struct st_buffer *STbp = STp->buffer;
1da177e4 2106
28f85009 2107 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 2108 return -ERESTARTSYS;
2109
2110 retval = rw_checks(STp, filp, count);
2111 if (retval || count == 0)
2112 goto out;
2113
2114 STm = &(STp->modes[STp->current_mode]);
9abe16c6
KM		 2115 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2116 if (!STm->do_read_ahead) {
2117 retval = (-EINVAL); /* Read must be integral number of blocks */
2118 goto out;
2119 }
2120 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
1da177e4
LT		 2121 }
2122
2123 STps = &(STp->ps[STp->partition]);
2124 if (STps->rw == ST_WRITING) {
2125 retval = flush_buffer(STp, 0);
2126 if (retval)
2127 goto out;
2128 STps->rw = ST_READING;
2129 }
b30d8bca 2130 DEB(
1da177e4 2131 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2132 st_printk(ST_DEB_MSG, STp,
2133 "EOF/EOM flag up (%d). Bytes %d\n",
2134 STps->eof, STbp->buffer_bytes);
2135 ) /* end DEB */
1da177e4
LT		 2136
2137 retval = setup_buffering(STp, buf, count, 1);
2138 if (retval)
2139 goto out;
2140 do_dio = STbp->do_dio;
2141
2142 if (STbp->buffer_bytes == 0 &&
2143 STps->eof >= ST_EOD_1) {
2144 if (STps->eof < ST_EOD) {
2145 STps->eof += 1;
2146 retval = 0;
2147 goto out;
2148 }
2149 retval = (-EIO); /* EOM or Blank Check */
2150 goto out;
2151 }
2152
2153 if (do_dio) {
2154 /* Check the buffer writability before any tape movement. Don't alter
2155 buffer data. */
2156 if (copy_from_user(&i, buf, 1) != 0 ||
2157 copy_to_user(buf, &i, 1) != 0 ||
2158 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2159 copy_to_user(buf + count - 1, &i, 1) != 0) {
2160 retval = (-EFAULT);
2161 goto out;
2162 }
2163 }
2164
2165 STps->rw = ST_READING;
2166
2167
2168 /* Loop until enough data in buffer or a special condition found */
2169 for (total = 0, special = 0; total < count && !special;) {
2170
2171 /* Get new data if the buffer is empty */
2172 if (STbp->buffer_bytes == 0) {
2173 special = read_tape(STp, count - total, &SRpnt);
2174 if (special < 0) { /* No need to continue read */
2175 retval = special;
2176 goto out;
2177 }
2178 }
2179
2180 /* Move the data from driver buffer to user buffer */
2181 if (STbp->buffer_bytes > 0) {
b30d8bca 2182 DEB(
1da177e4 2183 if (debugging && STps->eof != ST_NOEOF)
b30d8bca
HR		 2184 st_printk(ST_DEB_MSG, STp,
2185 "EOF up (%d). Left %d, needed %d.\n",
2186 STps->eof, STbp->buffer_bytes,
2187 (int)(count - total));
2188 ) /* end DEB */
1da177e4
LT		 2189 transfer = STbp->buffer_bytes < count - total ?
2190 STbp->buffer_bytes : count - total;
2191 if (!do_dio) {
2192 i = from_buffer(STbp, buf, transfer);
2193 if (i) {
2194 retval = i;
2195 goto out;
2196 }
2197 }
2198 buf += transfer;
2199 total += transfer;
2200 }
2201
2202 if (STp->block_size == 0)
2203 break; /* Read only one variable length block */
2204
2205 } /* for (total = 0, special = 0;
2206 total < count && !special; ) */
2207
2208 /* Change the eof state if no data from tape or buffer */
2209 if (total == 0) {
2210 if (STps->eof == ST_FM_HIT) {
2211 STps->eof = ST_FM;
2212 STps->drv_block = 0;
2213 if (STps->drv_file >= 0)
2214 STps->drv_file++;
2215 } else if (STps->eof == ST_EOD_1) {
2216 STps->eof = ST_EOD_2;
2217 STps->drv_block = 0;
2218 if (STps->drv_file >= 0)
2219 STps->drv_file++;
2220 } else if (STps->eof == ST_EOD_2)
2221 STps->eof = ST_EOD;
2222 } else if (STps->eof == ST_FM)
2223 STps->eof = ST_NOEOF;
2224 retval = total;
2225
2226 out:
2227 if (SRpnt != NULL) {
8b05b773 2228 st_release_request(SRpnt);
1da177e4
LT		 2229 SRpnt = NULL;
2230 }
2231 if (do_dio) {
787926b1 2232 release_buffering(STp, 1);
1da177e4
LT		 2233 STbp->buffer_bytes = 0;
2234 }
28f85009 2235 mutex_unlock(&STp->lock);
1da177e4
LT		 2236
2237 return retval;
2238}
2239\f
2240
2241
2242DEB(
2243/* Set the driver options */
b30d8bca 2244static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
1da177e4
LT		 2245{
2246 if (debugging) {
b30d8bca
HR		 2247 st_printk(KERN_INFO, STp,
2248 "Mode %d options: buffer writes: %d, "
2249 "async writes: %d, read ahead: %d\n",
2250 STp->current_mode, STm->do_buffer_writes,
2251 STm->do_async_writes, STm->do_read_ahead);
2252 st_printk(KERN_INFO, STp,
2253 " can bsr: %d, two FMs: %d, "
2254 "fast mteom: %d, auto lock: %d,\n",
2255 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2256 STp->do_auto_lock);
2257 st_printk(KERN_INFO, STp,
2258 " defs for wr: %d, no block limits: %d, "
2259 "partitions: %d, s2 log: %d\n",
2260 STm->defaults_for_writes, STp->omit_blklims,
2261 STp->can_partitions, STp->scsi2_logical);
2262 st_printk(KERN_INFO, STp,
2263 " sysv: %d nowait: %d sili: %d "
2264 "nowait_filemark: %d\n",
2265 STm->sysv, STp->immediate, STp->sili,
2266 STp->immediate_filemark);
2267 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
1da177e4
LT		 2268 }
2269}
2270 )
2271
2272
2273static int st_set_options(struct scsi_tape *STp, long options)
2274{
2275 int value;
2276 long code;
2277 struct st_modedef *STm;
1da177e4 2278 struct cdev *cd0, *cd1;
d6216c47 2279 struct device *d0, *d1;
1da177e4
LT		 2280
2281 STm = &(STp->modes[STp->current_mode]);
2282 if (!STm->defined) {
d6216c47
ML		 2283 cd0 = STm->cdevs[0];
2284 cd1 = STm->cdevs[1];
2285 d0 = STm->devs[0];
2286 d1 = STm->devs[1];
1da177e4 2287 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
d6216c47
ML		 2288 STm->cdevs[0] = cd0;
2289 STm->cdevs[1] = cd1;
2290 STm->devs[0] = d0;
2291 STm->devs[1] = d1;
1da177e4 2292 modes_defined = 1;
b30d8bca
HR		 2293 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2294 STp->current_mode);
1da177e4
LT		 2295 }
2296
2297 code = options & MT_ST_OPTIONS;
2298 if (code == MT_ST_BOOLEANS) {
2299 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2300 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2301 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2302 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2303 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2304 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2305 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2306 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2307 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2308 if ((STp->device)->scsi_level >= SCSI_2)
2309 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2310 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2311 STp->immediate = (options & MT_ST_NOWAIT) != 0;
c743e44f 2312 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
1da177e4 2313 STm->sysv = (options & MT_ST_SYSV) != 0;
40f6b36c 2314 STp->sili = (options & MT_ST_SILI) != 0;
1da177e4 2315 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
b30d8bca 2316 st_log_options(STp, STm); )
1da177e4
LT		 2317 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2318 value = (code == MT_ST_SETBOOLEANS);
2319 if ((options & MT_ST_BUFFER_WRITES) != 0)
2320 STm->do_buffer_writes = value;
2321 if ((options & MT_ST_ASYNC_WRITES) != 0)
2322 STm->do_async_writes = value;
2323 if ((options & MT_ST_DEF_WRITES) != 0)
2324 STm->defaults_for_writes = value;
2325 if ((options & MT_ST_READ_AHEAD) != 0)
2326 STm->do_read_ahead = value;
2327 if ((options & MT_ST_TWO_FM) != 0)
2328 STp->two_fm = value;
2329 if ((options & MT_ST_FAST_MTEOM) != 0)
2330 STp->fast_mteom = value;
2331 if ((options & MT_ST_AUTO_LOCK) != 0)
2332 STp->do_auto_lock = value;
2333 if ((options & MT_ST_CAN_BSR) != 0)
2334 STp->can_bsr = value;
2335 if ((options & MT_ST_NO_BLKLIMS) != 0)
2336 STp->omit_blklims = value;
2337 if ((STp->device)->scsi_level >= SCSI_2 &&
2338 (options & MT_ST_CAN_PARTITIONS) != 0)
2339 STp->can_partitions = value;
2340 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2341 STp->scsi2_logical = value;
2342 if ((options & MT_ST_NOWAIT) != 0)
2343 STp->immediate = value;
c743e44f
LD		 2344 if ((options & MT_ST_NOWAIT_EOF) != 0)
2345 STp->immediate_filemark = value;
1da177e4
LT		 2346 if ((options & MT_ST_SYSV) != 0)
2347 STm->sysv = value;
40f6b36c
KM		 2348 if ((options & MT_ST_SILI) != 0)
2349 STp->sili = value;
b30d8bca 2350 DEB(
1da177e4
LT		 2351 if ((options & MT_ST_DEBUGGING) != 0)
2352 debugging = value;
b30d8bca 2353 st_log_options(STp, STm); )
1da177e4
LT		 2354 } else if (code == MT_ST_WRITE_THRESHOLD) {
2355 /* Retained for compatibility */
2356 } else if (code == MT_ST_DEF_BLKSIZE) {
2357 value = (options & ~MT_ST_OPTIONS);
2358 if (value == ~MT_ST_OPTIONS) {
2359 STm->default_blksize = (-1);
b30d8bca 2360 DEBC_printk(STp, "Default block size disabled.\n");
1da177e4
LT		 2361 } else {
2362 STm->default_blksize = value;
b30d8bca
HR		 2363 DEBC_printk(STp,"Default block size set to "
2364 "%d bytes.\n", STm->default_blksize);
1da177e4
LT		 2365 if (STp->ready == ST_READY) {
2366 STp->blksize_changed = 0;
2367 set_mode_densblk(STp, STm);
2368 }
2369 }
2370 } else if (code == MT_ST_TIMEOUTS) {
2371 value = (options & ~MT_ST_OPTIONS);
2372 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2373 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
b30d8bca
HR		 2374 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2375 (value & ~MT_ST_SET_LONG_TIMEOUT));
1da177e4 2376 } else {
a02488ed
JB		 2377 blk_queue_rq_timeout(STp->device->request_queue,
2378 value * HZ);
b30d8bca
HR		 2379 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2380 value);
1da177e4
LT		 2381 }
2382 } else if (code == MT_ST_SET_CLN) {
2383 value = (options & ~MT_ST_OPTIONS) & 0xff;
2384 if (value != 0 &&
832151f4
RK		 2385 (value < EXTENDED_SENSE_START ||
2386 value >= SCSI_SENSE_BUFFERSIZE))
1da177e4
LT		 2387 return (-EINVAL);
2388 STp->cln_mode = value;
2389 STp->cln_sense_mask = (options >> 8) & 0xff;
2390 STp->cln_sense_value = (options >> 16) & 0xff;
b30d8bca
HR		 2391 st_printk(KERN_INFO, STp,
2392 "Cleaning request mode %d, mask %02x, value %02x\n",
2393 value, STp->cln_sense_mask, STp->cln_sense_value);
1da177e4
LT		 2394 } else if (code == MT_ST_DEF_OPTIONS) {
2395 code = (options & ~MT_ST_CLEAR_DEFAULT);
2396 value = (options & MT_ST_CLEAR_DEFAULT);
2397 if (code == MT_ST_DEF_DENSITY) {
2398 if (value == MT_ST_CLEAR_DEFAULT) {
2399 STm->default_density = (-1);
b30d8bca
HR		 2400 DEBC_printk(STp,
2401 "Density default disabled.\n");
1da177e4
LT		 2402 } else {
2403 STm->default_density = value & 0xff;
b30d8bca
HR		 2404 DEBC_printk(STp, "Density default set to %x\n",
2405 STm->default_density);
1da177e4
LT		 2406 if (STp->ready == ST_READY) {
2407 STp->density_changed = 0;
2408 set_mode_densblk(STp, STm);
2409 }
2410 }
2411 } else if (code == MT_ST_DEF_DRVBUFFER) {
2412 if (value == MT_ST_CLEAR_DEFAULT) {
2413 STp->default_drvbuffer = 0xff;
b30d8bca
HR		 2414 DEBC_printk(STp,
2415 "Drive buffer default disabled.\n");
1da177e4
LT		 2416 } else {
2417 STp->default_drvbuffer = value & 7;
b30d8bca
HR		 2418 DEBC_printk(STp,
2419 "Drive buffer default set to %x\n",
2420 STp->default_drvbuffer);
1da177e4
LT		 2421 if (STp->ready == ST_READY)
2422 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2423 }
2424 } else if (code == MT_ST_DEF_COMPRESSION) {
2425 if (value == MT_ST_CLEAR_DEFAULT) {
2426 STm->default_compression = ST_DONT_TOUCH;
b30d8bca
HR		 2427 DEBC_printk(STp,
2428 "Compression default disabled.\n");
1da177e4
LT		 2429 } else {
2430 if ((value & 0xff00) != 0) {
2431 STp->c_algo = (value & 0xff00) >> 8;
b30d8bca
HR		 2432 DEBC_printk(STp, "Compression "
2433 "algorithm set to 0x%x.\n",
2434 STp->c_algo);
1da177e4
LT		 2435 }
2436 if ((value & 0xff) != 0xff) {
2437 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
b30d8bca
HR		 2438 DEBC_printk(STp, "Compression default "
2439 "set to %x\n",
2440 (value & 1));
1da177e4
LT		 2441 if (STp->ready == ST_READY) {
2442 STp->compression_changed = 0;
2443 st_compression(STp, (STm->default_compression == ST_YES));
2444 }
2445 }
2446 }
2447 }
2448 } else
2449 return (-EIO);
2450
2451 return 0;
2452}
2453\f
2454#define MODE_HEADER_LENGTH 4
2455
2456/* Mode header and page byte offsets */
2457#define MH_OFF_DATA_LENGTH 0
2458#define MH_OFF_MEDIUM_TYPE 1
2459#define MH_OFF_DEV_SPECIFIC 2
2460#define MH_OFF_BDESCS_LENGTH 3
2461#define MP_OFF_PAGE_NBR 0
2462#define MP_OFF_PAGE_LENGTH 1
2463
2464/* Mode header and page bit masks */
2465#define MH_BIT_WP 0x80
2466#define MP_MSK_PAGE_NBR 0x3f
2467
2468/* Don't return block descriptors */
2469#define MODE_SENSE_OMIT_BDESCS 0x08
2470
2471#define MODE_SELECT_PAGE_FORMAT 0x10
2472
2473/* Read a mode page into the tape buffer. The block descriptors are included
2474 if incl_block_descs is true. The page control is ored to the page number
2475 parameter, if necessary. */
2476static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2477{
2478 unsigned char cmd[MAX_COMMAND_SIZE];
8ecf0d99 2479 struct st_request *SRpnt;
1da177e4
LT		 2480
2481 memset(cmd, 0, MAX_COMMAND_SIZE);
2482 cmd[0] = MODE_SENSE;
2483 if (omit_block_descs)
2484 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2485 cmd[2] = page;
2486 cmd[4] = 255;
2487
02ae2c0e
KM		 2488 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2489 STp->device->request_queue->rq_timeout, 0, 1);
2490 if (SRpnt == NULL)
2491 return (STp->buffer)->syscall_result;
1da177e4 2492
8b05b773 2493 st_release_request(SRpnt);
1da177e4 2494
02ae2c0e 2495 return STp->buffer->syscall_result;
1da177e4
LT		 2496}
2497
2498
2499/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2500 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2501static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2502{
02ae2c0e 2503 int pgo;
1da177e4 2504 unsigned char cmd[MAX_COMMAND_SIZE];
18c87015 2505 struct st_request *SRpnt;
02ae2c0e 2506 int timeout;
1da177e4
LT		 2507
2508 memset(cmd, 0, MAX_COMMAND_SIZE);
2509 cmd[0] = MODE_SELECT;
2510 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2511 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2512 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2513
2514 /* Clear reserved fields */
2515 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2516 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2517 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2518 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2519
02ae2c0e
KM		 2520 timeout = slow ?
2521 STp->long_timeout : STp->device->request_queue->rq_timeout;
2522 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2523 timeout, 0, 1);
2524 if (SRpnt == NULL)
2525 return (STp->buffer)->syscall_result;
1da177e4 2526
8b05b773 2527 st_release_request(SRpnt);
1da177e4 2528
02ae2c0e 2529 return STp->buffer->syscall_result;
1da177e4
LT		 2530}
2531
2532
2533#define COMPRESSION_PAGE 0x0f
2534#define COMPRESSION_PAGE_LENGTH 16
2535
2536#define CP_OFF_DCE_DCC 2
2537#define CP_OFF_C_ALGO 7
2538
2539#define DCE_MASK 0x80
2540#define DCC_MASK 0x40
2541#define RED_MASK 0x60
2542
2543
2544/* Control the compression with mode page 15. Algorithm not changed if zero.
2545
2546 The block descriptors are read and written because Sony SDT-7000 does not
2547 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2548 Including block descriptors should not cause any harm to other drives. */
2549
2550static int st_compression(struct scsi_tape * STp, int state)
2551{
2552 int retval;
2553 int mpoffs; /* Offset to mode page start */
2554 unsigned char *b_data = (STp->buffer)->b_data;
1da177e4
LT		 2555
2556 if (STp->ready != ST_READY)
2557 return (-EIO);
2558
2559 /* Read the current page contents */
2560 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2561 if (retval) {
b30d8bca 2562 DEBC_printk(STp, "Compression mode page not supported.\n");
1da177e4
LT		 2563 return (-EIO);
2564 }
2565
2566 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 2567 DEBC_printk(STp, "Compression state is %d.\n",
2568 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
1da177e4
LT		 2569
2570 /* Check if compression can be changed */
2571 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
b30d8bca 2572 DEBC_printk(STp, "Compression not supported.\n");
1da177e4
LT		 2573 return (-EIO);
2574 }
2575
2576 /* Do the change */
2577 if (state) {
2578 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2579 if (STp->c_algo != 0)
2580 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2581 }
2582 else {
2583 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2584 if (STp->c_algo != 0)
2585 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2586 }
2587
2588 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2589 if (retval) {
b30d8bca 2590 DEBC_printk(STp, "Compression change failed.\n");
1da177e4
LT		 2591 return (-EIO);
2592 }
b30d8bca 2593 DEBC_printk(STp, "Compression state changed to %d.\n", state);
1da177e4
LT		 2594
2595 STp->compression_changed = 1;
2596 return 0;
2597}
2598
2599
2600/* Process the load and unload commands (does unload if the load code is zero) */
2601static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2602{
2603 int retval = (-EIO), timeout;
1da177e4
LT		 2604 unsigned char cmd[MAX_COMMAND_SIZE];
2605 struct st_partstat *STps;
8b05b773 2606 struct st_request *SRpnt;
1da177e4
LT		 2607
2608 if (STp->ready != ST_READY && !load_code) {
2609 if (STp->ready == ST_NO_TAPE)
2610 return (-ENOMEDIUM);
2611 else
2612 return (-EIO);
2613 }
2614
2615 memset(cmd, 0, MAX_COMMAND_SIZE);
2616 cmd[0] = START_STOP;
2617 if (load_code)
2618 cmd[4] |= 1;
2619 /*
2620 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2621 */
2622 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2623 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
b30d8bca
HR		 2624 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2625 (cmd[4]) ? "" : "un",
2626 load_code - MT_ST_HPLOADER_OFFSET);
1da177e4
LT		 2627 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2628 }
2629 if (STp->immediate) {
2630 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2631 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2632 }
2633 else
2634 timeout = STp->long_timeout;
2635
2636 DEBC(
2637 if (!load_code)
b30d8bca 2638 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
1da177e4 2639 else
b30d8bca 2640 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
1da177e4
LT		 2641 );
2642
02ae2c0e
KM		 2643 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2644 timeout, MAX_RETRIES, 1);
1da177e4 2645 if (!SRpnt)
02ae2c0e 2646 return (STp->buffer)->syscall_result;
1da177e4
LT		 2647
2648 retval = (STp->buffer)->syscall_result;
02ae2c0e 2649 st_release_request(SRpnt);
1da177e4
LT		 2650
2651 if (!retval) { /* SCSI command successful */
2652
2653 if (!load_code) {
2654 STp->rew_at_close = 0;
2655 STp->ready = ST_NO_TAPE;
2656 }
2657 else {
2658 STp->rew_at_close = STp->autorew_dev;
2659 retval = check_tape(STp, filp);
2660 if (retval > 0)
2661 retval = 0;
2662 }
2663 }
2664 else {
2665 STps = &(STp->ps[STp->partition]);
2666 STps->drv_file = STps->drv_block = (-1);
2667 }
2668
2669 return retval;
2670}
2671\f
2672#if DEBUG
2673#define ST_DEB_FORWARD 0
2674#define ST_DEB_BACKWARD 1
b30d8bca 2675static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
1da177e4
LT		 2676{
2677 s32 sc;
2678
b30d8bca
HR		 2679 if (!debugging)
2680 return;
2681
1da177e4
LT		 2682 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2683 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2684 if (direction)
2685 sc = -sc;
b30d8bca
HR		 2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2687 direction ? "backward" : "forward", sc, units);
1da177e4 2688}
b30d8bca
HR		 2689#else
2690#define ST_DEB_FORWARD 0
2691#define ST_DEB_BACKWARD 1
2692static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
1da177e4
LT		 2693#endif
2694
2695
2696/* Internal ioctl function */
2697static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2698{
2699 int timeout;
2700 long ltmp;
2701 int ioctl_result;
2702 int chg_eof = 1;
2703 unsigned char cmd[MAX_COMMAND_SIZE];
8b05b773 2704 struct st_request *SRpnt;
1da177e4
LT		 2705 struct st_partstat *STps;
2706 int fileno, blkno, at_sm, undone;
2707 int datalen = 0, direction = DMA_NONE;
1da177e4
LT		 2708
2709 WARN_ON(STp->buffer->do_dio != 0);
2710 if (STp->ready != ST_READY) {
2711 if (STp->ready == ST_NO_TAPE)
2712 return (-ENOMEDIUM);
2713 else
2714 return (-EIO);
2715 }
2716 timeout = STp->long_timeout;
2717 STps = &(STp->ps[STp->partition]);
2718 fileno = STps->drv_file;
2719 blkno = STps->drv_block;
2720 at_sm = STps->at_sm;
2721
2722 memset(cmd, 0, MAX_COMMAND_SIZE);
2723 switch (cmd_in) {
2724 case MTFSFM:
2725 chg_eof = 0; /* Changed from the FSF after this */
2726 case MTFSF:
2727 cmd[0] = SPACE;
2728 cmd[1] = 0x01; /* Space FileMarks */
2729 cmd[2] = (arg >> 16);
2730 cmd[3] = (arg >> 8);
2731 cmd[4] = arg;
b30d8bca 2732 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
1da177e4
LT		 2733 if (fileno >= 0)
2734 fileno += arg;
2735 blkno = 0;
2736 at_sm &= (arg == 0);
2737 break;
2738 case MTBSFM:
2739 chg_eof = 0; /* Changed from the FSF after this */
2740 case MTBSF:
2741 cmd[0] = SPACE;
2742 cmd[1] = 0x01; /* Space FileMarks */
2743 ltmp = (-arg);
2744 cmd[2] = (ltmp >> 16);
2745 cmd[3] = (ltmp >> 8);
2746 cmd[4] = ltmp;
b30d8bca 2747 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
1da177e4
LT		 2748 if (fileno >= 0)
2749 fileno -= arg;
2750 blkno = (-1); /* We can't know the block number */
2751 at_sm &= (arg == 0);
2752 break;
2753 case MTFSR:
2754 cmd[0] = SPACE;
2755 cmd[1] = 0x00; /* Space Blocks */
2756 cmd[2] = (arg >> 16);
2757 cmd[3] = (arg >> 8);
2758 cmd[4] = arg;
b30d8bca 2759 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
1da177e4
LT		 2760 if (blkno >= 0)
2761 blkno += arg;
2762 at_sm &= (arg == 0);
2763 break;
2764 case MTBSR:
2765 cmd[0] = SPACE;
2766 cmd[1] = 0x00; /* Space Blocks */
2767 ltmp = (-arg);
2768 cmd[2] = (ltmp >> 16);
2769 cmd[3] = (ltmp >> 8);
2770 cmd[4] = ltmp;
b30d8bca 2771 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
1da177e4
LT		 2772 if (blkno >= 0)
2773 blkno -= arg;
2774 at_sm &= (arg == 0);
2775 break;
2776 case MTFSS:
2777 cmd[0] = SPACE;
2778 cmd[1] = 0x04; /* Space Setmarks */
2779 cmd[2] = (arg >> 16);
2780 cmd[3] = (arg >> 8);
2781 cmd[4] = arg;
b30d8bca 2782 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
1da177e4
LT		 2783 if (arg != 0) {
2784 blkno = fileno = (-1);
2785 at_sm = 1;
2786 }
2787 break;
2788 case MTBSS:
2789 cmd[0] = SPACE;
2790 cmd[1] = 0x04; /* Space Setmarks */
2791 ltmp = (-arg);
2792 cmd[2] = (ltmp >> 16);
2793 cmd[3] = (ltmp >> 8);
2794 cmd[4] = ltmp;
b30d8bca 2795 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
1da177e4
LT		 2796 if (arg != 0) {
2797 blkno = fileno = (-1);
2798 at_sm = 1;
2799 }
2800 break;
2801 case MTWEOF:
3e51d3c9 2802 case MTWEOFI:
1da177e4
LT		 2803 case MTWSM:
2804 if (STp->write_prot)
2805 return (-EACCES);
2806 cmd[0] = WRITE_FILEMARKS;
2807 if (cmd_in == MTWSM)
2808 cmd[1] = 2;
c743e44f
LD		 2809 if (cmd_in == MTWEOFI ||
2810 (cmd_in == MTWEOF && STp->immediate_filemark))
3e51d3c9 2811 cmd[1] |= 1;
1da177e4
LT		 2812 cmd[2] = (arg >> 16);
2813 cmd[3] = (arg >> 8);
2814 cmd[4] = arg;
a02488ed 2815 timeout = STp->device->request_queue->rq_timeout;
b30d8bca
HR		 2816 DEBC(
2817 if (cmd_in != MTWSM)
2818 st_printk(ST_DEB_MSG, STp,
2819 "Writing %d filemarks.\n",
2820 cmd[2] * 65536 +
2821 cmd[3] * 256 +
2822 cmd[4]);
2823 else
2824 st_printk(ST_DEB_MSG, STp,
2825 "Writing %d setmarks.\n",
2826 cmd[2] * 65536 +
2827 cmd[3] * 256 +
2828 cmd[4]);
1da177e4
LT		 2829 )
2830 if (fileno >= 0)
2831 fileno += arg;
2832 blkno = 0;
2833 at_sm = (cmd_in == MTWSM);
2834 break;
2835 case MTREW:
2836 cmd[0] = REZERO_UNIT;
2837 if (STp->immediate) {
2838 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2839 timeout = STp->device->request_queue->rq_timeout;
1da177e4 2840 }
b30d8bca 2841 DEBC_printk(STp, "Rewinding tape.\n");
1da177e4
LT		 2842 fileno = blkno = at_sm = 0;
2843 break;
2844 case MTNOP:
b30d8bca 2845 DEBC_printk(STp, "No op on tape.\n");
1da177e4
LT		 2846 return 0; /* Should do something ? */
2847 break;
2848 case MTRETEN:
2849 cmd[0] = START_STOP;
2850 if (STp->immediate) {
2851 cmd[1] = 1; /* Don't wait for completion */
a02488ed 2852 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2853 }
2854 cmd[4] = 3;
b30d8bca 2855 DEBC_printk(STp, "Retensioning tape.\n");
1da177e4
LT		 2856 fileno = blkno = at_sm = 0;
2857 break;
2858 case MTEOM:
2859 if (!STp->fast_mteom) {
2860 /* space to the end of tape */
2861 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2862 fileno = STps->drv_file;
2863 if (STps->eof >= ST_EOD_1)
2864 return 0;
2865 /* The next lines would hide the number of spaced FileMarks
2866 That's why I inserted the previous lines. I had no luck
2867 with detecting EOM with FSF, so we go now to EOM.
2868 Joerg Weule */
2869 } else
2870 fileno = (-1);
2871 cmd[0] = SPACE;
2872 cmd[1] = 3;
b30d8bca 2873 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
1da177e4
LT		 2874 blkno = -1;
2875 at_sm = 0;
2876 break;
2877 case MTERASE:
2878 if (STp->write_prot)
2879 return (-EACCES);
2880 cmd[0] = ERASE;
2881 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2882 if (STp->immediate) {
2883 cmd[1] |= 2; /* Don't wait for completion */
a02488ed 2884 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 2885 }
2886 else
2887 timeout = STp->long_timeout * 8;
2888
b30d8bca 2889 DEBC_printk(STp, "Erasing tape.\n");
1da177e4
LT		 2890 fileno = blkno = at_sm = 0;
2891 break;
2892 case MTSETBLK: /* Set block length */
2893 case MTSETDENSITY: /* Set tape density */
2894 case MTSETDRVBUFFER: /* Set drive buffering */
2895 case SET_DENS_AND_BLK: /* Set density and block size */
2896 chg_eof = 0;
2897 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2898 return (-EIO); /* Not allowed if data in buffer */
2899 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2900 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2901 STp->max_block > 0 &&
2902 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2903 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
b30d8bca 2904 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
1da177e4
LT		 2905 return (-EINVAL);
2906 }
2907 cmd[0] = MODE_SELECT;
2908 if ((STp->use_pf & USE_PF))
2909 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2910 cmd[4] = datalen = 12;
2911 direction = DMA_TO_DEVICE;
2912
2913 memset((STp->buffer)->b_data, 0, 12);
2914 if (cmd_in == MTSETDRVBUFFER)
2915 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2916 else
2917 (STp->buffer)->b_data[2] =
2918 STp->drv_buffer << 4;
2919 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2920 if (cmd_in == MTSETDENSITY) {
2921 (STp->buffer)->b_data[4] = arg;
2922 STp->density_changed = 1; /* At least we tried ;-) */
2923 } else if (cmd_in == SET_DENS_AND_BLK)
2924 (STp->buffer)->b_data[4] = arg >> 24;
2925 else
2926 (STp->buffer)->b_data[4] = STp->density;
2927 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2928 ltmp = arg & MT_ST_BLKSIZE_MASK;
2929 if (cmd_in == MTSETBLK)
2930 STp->blksize_changed = 1; /* At least we tried ;-) */
2931 } else
2932 ltmp = STp->block_size;
2933 (STp->buffer)->b_data[9] = (ltmp >> 16);
2934 (STp->buffer)->b_data[10] = (ltmp >> 8);
2935 (STp->buffer)->b_data[11] = ltmp;
a02488ed 2936 timeout = STp->device->request_queue->rq_timeout;
b30d8bca 2937 DEBC(
1da177e4 2938 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2939 st_printk(ST_DEB_MSG, STp,
2940 "Setting block size to %d bytes.\n",
2941 (STp->buffer)->b_data[9] * 65536 +
2942 (STp->buffer)->b_data[10] * 256 +
2943 (STp->buffer)->b_data[11]);
1da177e4 2944 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
b30d8bca
HR		 2945 st_printk(ST_DEB_MSG, STp,
2946 "Setting density code to %x.\n",
2947 (STp->buffer)->b_data[4]);
1da177e4 2948 if (cmd_in == MTSETDRVBUFFER)
b30d8bca
HR		 2949 st_printk(ST_DEB_MSG, STp,
2950 "Setting drive buffer code to %d.\n",
2951 ((STp->buffer)->b_data[2] >> 4) & 7);
1da177e4
LT		 2952 )
2953 break;
2954 default:
2955 return (-ENOSYS);
2956 }
2957
02ae2c0e
KM		 2958 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2959 timeout, MAX_RETRIES, 1);
1da177e4
LT		 2960 if (!SRpnt)
2961 return (STp->buffer)->syscall_result;
2962
02ae2c0e 2963 ioctl_result = (STp->buffer)->syscall_result;
1da177e4
LT		 2964
2965 if (!ioctl_result) { /* SCSI command successful */
8b05b773 2966 st_release_request(SRpnt);
1da177e4
LT		 2967 SRpnt = NULL;
2968 STps->drv_block = blkno;
2969 STps->drv_file = fileno;
2970 STps->at_sm = at_sm;
2971
2972 if (cmd_in == MTBSFM)
2973 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2974 else if (cmd_in == MTFSFM)
2975 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2976
2977 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
1da177e4
LT		 2978 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2979 if (STp->block_size != 0) {
1da177e4
LT		 2980 (STp->buffer)->buffer_blocks =
2981 (STp->buffer)->buffer_size / STp->block_size;
2982 }
2983 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2984 if (cmd_in == SET_DENS_AND_BLK)
2985 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2986 } else if (cmd_in == MTSETDRVBUFFER)
2987 STp->drv_buffer = (arg & 7);
2988 else if (cmd_in == MTSETDENSITY)
2989 STp->density = arg;
2990
2991 if (cmd_in == MTEOM)
2992 STps->eof = ST_EOD;
2993 else if (cmd_in == MTFSF)
2994 STps->eof = ST_FM;
2995 else if (chg_eof)
2996 STps->eof = ST_NOEOF;
2997
3e51d3c9
KM		 2998 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2999 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
1da177e4
LT		 3000 } else { /* SCSI command was not completely successful. Don't return
3001 from this block without releasing the SCSI command block! */
3002 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3003
3004 if (cmdstatp->flags & SENSE_EOM) {
3005 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3006 cmd_in != MTBSR && cmd_in != MTBSS)
3007 STps->eof = ST_EOM_OK;
3008 STps->drv_block = 0;
3009 }
3010
3011 if (cmdstatp->remainder_valid)
3012 undone = (int)cmdstatp->uremainder64;
3013 else
3014 undone = 0;
3015
3e51d3c9 3016 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
1da177e4 3017 cmdstatp->have_sense &&
91614c05
KM		 3018 (cmdstatp->flags & SENSE_EOM)) {
3019 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3020 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3021 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3022 STps->eof = ST_NOEOF;
3023 } else { /* Writing EOF(s) failed */
3024 if (fileno >= 0)
3025 fileno -= undone;
3026 if (undone < arg)
3027 STps->eof = ST_NOEOF;
3028 }
1da177e4 3029 STps->drv_file = fileno;
1da177e4
LT		 3030 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3031 if (fileno >= 0)
3032 STps->drv_file = fileno - undone;
3033 else
3034 STps->drv_file = fileno;
3035 STps->drv_block = -1;
3036 STps->eof = ST_NOEOF;
3037 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3038 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3039 undone = (-undone);
3040 if (STps->drv_file >= 0)
3041 STps->drv_file = fileno + undone;
3042 STps->drv_block = 0;
3043 STps->eof = ST_NOEOF;
3044 } else if (cmd_in == MTFSR) {
3045 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3046 if (STps->drv_file >= 0)
3047 STps->drv_file++;
3048 STps->drv_block = 0;
3049 STps->eof = ST_FM;
3050 } else {
3051 if (blkno >= undone)
3052 STps->drv_block = blkno - undone;
3053 else
3054 STps->drv_block = (-1);
3055 STps->eof = ST_NOEOF;
3056 }
3057 } else if (cmd_in == MTBSR) {
3058 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3059 STps->drv_file--;
3060 STps->drv_block = (-1);
3061 } else {
3062 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3063 undone = (-undone);
3064 if (STps->drv_block >= 0)
3065 STps->drv_block = blkno + undone;
3066 }
3067 STps->eof = ST_NOEOF;
3068 } else if (cmd_in == MTEOM) {
3069 STps->drv_file = (-1);
3070 STps->drv_block = (-1);
3071 STps->eof = ST_EOD;
3072 } else if (cmd_in == MTSETBLK ||
3073 cmd_in == MTSETDENSITY ||
3074 cmd_in == MTSETDRVBUFFER ||
3075 cmd_in == SET_DENS_AND_BLK) {
3076 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3077 !(STp->use_pf & PF_TESTED)) {
3078 /* Try the other possible state of Page Format if not
3079 already tried */
1da2019f 3080 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
8b05b773 3081 st_release_request(SRpnt);
1da177e4
LT		 3082 SRpnt = NULL;
3083 return st_int_ioctl(STp, cmd_in, arg);
3084 }
3085 } else if (chg_eof)
3086 STps->eof = ST_NOEOF;
3087
3088 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3089 STps->eof = ST_EOD;
3090
8b05b773 3091 st_release_request(SRpnt);
1da177e4
LT		 3092 SRpnt = NULL;
3093 }
3094
3095 return ioctl_result;
3096}
3097\f
3098
3099/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3100 structure. */
3101
3102static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3103 int logical)
3104{
3105 int result;
3106 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3107 struct st_request *SRpnt;
1da177e4
LT		 3108
3109 if (STp->ready != ST_READY)
3110 return (-EIO);
3111
3112 memset(scmd, 0, MAX_COMMAND_SIZE);
3113 if ((STp->device)->scsi_level < SCSI_2) {
3114 scmd[0] = QFA_REQUEST_BLOCK;
3115 scmd[4] = 3;
3116 } else {
3117 scmd[0] = READ_POSITION;
3118 if (!logical && !STp->scsi2_logical)
3119 scmd[1] = 1;
3120 }
02ae2c0e
KM		 3121 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3122 STp->device->request_queue->rq_timeout,
3123 MAX_READY_RETRIES, 1);
1da177e4 3124 if (!SRpnt)
02ae2c0e 3125 return (STp->buffer)->syscall_result;
1da177e4
LT		 3126
3127 if ((STp->buffer)->syscall_result != 0 ||
3128 (STp->device->scsi_level >= SCSI_2 &&
3129 ((STp->buffer)->b_data[0] & 4) != 0)) {
3130 *block = *partition = 0;
b30d8bca 3131 DEBC_printk(STp, " Can't read tape position.\n");
1da177e4
LT		 3132 result = (-EIO);
3133 } else {
3134 result = 0;
3135 if ((STp->device)->scsi_level < SCSI_2) {
3136 *block = ((STp->buffer)->b_data[0] << 16)
3137 + ((STp->buffer)->b_data[1] << 8)
3138 + (STp->buffer)->b_data[2];
3139 *partition = 0;
3140 } else {
3141 *block = ((STp->buffer)->b_data[4] << 24)
3142 + ((STp->buffer)->b_data[5] << 16)
3143 + ((STp->buffer)->b_data[6] << 8)
3144 + (STp->buffer)->b_data[7];
3145 *partition = (STp->buffer)->b_data[1];
3146 if (((STp->buffer)->b_data[0] & 0x80) &&
3147 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3148 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3149 }
b30d8bca
HR		 3150 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3151 *block, *partition);
1da177e4 3152 }
8b05b773 3153 st_release_request(SRpnt);
1da177e4
LT		 3154 SRpnt = NULL;
3155
3156 return result;
3157}
3158
3159
3160/* Set the tape block and partition. Negative partition means that only the
3161 block should be set in vendor specific way. */
3162static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3163 int logical)
3164{
3165 struct st_partstat *STps;
3166 int result, p;
3167 unsigned int blk;
3168 int timeout;
3169 unsigned char scmd[MAX_COMMAND_SIZE];
8b05b773 3170 struct st_request *SRpnt;
1da177e4
LT		 3171
3172 if (STp->ready != ST_READY)
3173 return (-EIO);
3174 timeout = STp->long_timeout;
3175 STps = &(STp->ps[STp->partition]);
3176
b30d8bca
HR		 3177 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3178 block, partition);
1da177e4
LT		 3179 DEB(if (partition < 0)
3180 return (-EIO); )
3181
3182 /* Update the location at the partition we are leaving */
3183 if ((!STp->can_partitions && partition != 0) ||
3184 partition >= ST_NBR_PARTITIONS)
3185 return (-EINVAL);
3186 if (partition != STp->partition) {
3187 if (get_location(STp, &blk, &p, 1))
3188 STps->last_block_valid = 0;
3189 else {
3190 STps->last_block_valid = 1;
3191 STps->last_block_visited = blk;
b30d8bca
HR		 3192 DEBC_printk(STp, "Visited block %d for "
3193 "partition %d saved.\n",
3194 blk, STp->partition);
1da177e4
LT		 3195 }
3196 }
3197
3198 memset(scmd, 0, MAX_COMMAND_SIZE);
3199 if ((STp->device)->scsi_level < SCSI_2) {
3200 scmd[0] = QFA_SEEK_BLOCK;
3201 scmd[2] = (block >> 16);
3202 scmd[3] = (block >> 8);
3203 scmd[4] = block;
3204 scmd[5] = 0;
3205 } else {
3206 scmd[0] = SEEK_10;
3207 scmd[3] = (block >> 24);
3208 scmd[4] = (block >> 16);
3209 scmd[5] = (block >> 8);
3210 scmd[6] = block;
3211 if (!logical && !STp->scsi2_logical)
3212 scmd[1] = 4;
3213 if (STp->partition != partition) {
3214 scmd[1] |= 2;
3215 scmd[8] = partition;
b30d8bca
HR		 3216 DEBC_printk(STp, "Trying to change partition "
3217 "from %d to %d\n", STp->partition,
3218 partition);
1da177e4
LT		 3219 }
3220 }
3221 if (STp->immediate) {
3222 scmd[1] |= 1; /* Don't wait for completion */
a02488ed 3223 timeout = STp->device->request_queue->rq_timeout;
1da177e4
LT		 3224 }
3225
02ae2c0e
KM		 3226 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3227 timeout, MAX_READY_RETRIES, 1);
1da177e4 3228 if (!SRpnt)
02ae2c0e 3229 return (STp->buffer)->syscall_result;
1da177e4
LT		 3230
3231 STps->drv_block = STps->drv_file = (-1);
3232 STps->eof = ST_NOEOF;
3233 if ((STp->buffer)->syscall_result != 0) {
3234 result = (-EIO);
3235 if (STp->can_partitions &&
3236 (STp->device)->scsi_level >= SCSI_2 &&
3237 (p = find_partition(STp)) >= 0)
3238 STp->partition = p;
3239 } else {
3240 if (STp->can_partitions) {
3241 STp->partition = partition;
3242 STps = &(STp->ps[partition]);
3243 if (!STps->last_block_valid ||
3244 STps->last_block_visited != block) {
3245 STps->at_sm = 0;
3246 STps->rw = ST_IDLE;
3247 }
3248 } else
3249 STps->at_sm = 0;
3250 if (block == 0)
3251 STps->drv_block = STps->drv_file = 0;
3252 result = 0;
3253 }
02ae2c0e 3254
8b05b773 3255 st_release_request(SRpnt);
1da177e4
LT		 3256 SRpnt = NULL;
3257
3258 return result;
3259}
3260
3261
3262/* Find the current partition number for the drive status. Called from open and
3263 returns either partition number of negative error code. */
3264static int find_partition(struct scsi_tape *STp)
3265{
3266 int i, partition;
3267 unsigned int block;
3268
3269 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3270 return i;
3271 if (partition >= ST_NBR_PARTITIONS)
3272 return (-EIO);
3273 return partition;
3274}
3275
3276
3277/* Change the partition if necessary */
3278static int switch_partition(struct scsi_tape *STp)
3279{
3280 struct st_partstat *STps;
3281
3282 if (STp->partition == STp->new_partition)
3283 return 0;
3284 STps = &(STp->ps[STp->new_partition]);
3285 if (!STps->last_block_valid)
3286 STps->last_block_visited = 0;
3287 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3288}
3289\f
3290/* Functions for reading and writing the medium partition mode page. */
3291
3292#define PART_PAGE 0x11
3293#define PART_PAGE_FIXED_LENGTH 8
3294
3295#define PP_OFF_MAX_ADD_PARTS 2
3296#define PP_OFF_NBR_ADD_PARTS 3
3297#define PP_OFF_FLAGS 4
3298#define PP_OFF_PART_UNITS 6
3299#define PP_OFF_RESERVED 7
3300
3301#define PP_BIT_IDP 0x20
8038e645 3302#define PP_BIT_FDP 0x80
1da177e4 3303#define PP_MSK_PSUM_MB 0x10
8038e645
KM		 3304#define PP_MSK_PSUM_UNITS 0x18
3305#define PP_MSK_POFM 0x04
1da177e4
LT		 3306
3307/* Get the number of partitions on the tape. As a side effect reads the
3308 mode page into the tape buffer. */
3309static int nbr_partitions(struct scsi_tape *STp)
3310{
3311 int result;
1da177e4
LT		 3312
3313 if (STp->ready != ST_READY)
3314 return (-EIO);
3315
3316 result = read_mode_page(STp, PART_PAGE, 1);
3317
3318 if (result) {
b30d8bca 3319 DEBC_printk(STp, "Can't read medium partition page.\n");
1da177e4
LT		 3320 result = (-EIO);
3321 } else {
3322 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3323 PP_OFF_NBR_ADD_PARTS] + 1;
b30d8bca 3324 DEBC_printk(STp, "Number of partitions %d.\n", result);
1da177e4
LT		 3325 }
3326
3327 return result;
3328}
3329
3330
8038e645
KM		 3331static int format_medium(struct scsi_tape *STp, int format)
3332{
3333 int result = 0;
3334 int timeout = STp->long_timeout;
3335 unsigned char scmd[MAX_COMMAND_SIZE];
3336 struct st_request *SRpnt;
3337
3338 memset(scmd, 0, MAX_COMMAND_SIZE);
3339 scmd[0] = FORMAT_UNIT;
3340 scmd[2] = format;
3341 if (STp->immediate) {
3342 scmd[1] |= 1; /* Don't wait for completion */
3343 timeout = STp->device->request_queue->rq_timeout;
3344 }
3345 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3346 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3347 timeout, MAX_RETRIES, 1);
3348 if (!SRpnt)
3349 result = STp->buffer->syscall_result;
3350 return result;
3351}
3352
3353
1da177e4
LT		 3354/* Partition the tape into two partitions if size > 0 or one partition if
3355 size == 0.
3356
3357 The block descriptors are read and written because Sony SDT-7000 does not
3358 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3359
3360 My HP C1533A drive returns only one partition size field. This is used to
3361 set the size of partition 1. There is no size field for the default partition.
3362 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3363 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3364 The following algorithm is used to accommodate both drives: if the number of
3365 partition size fields is greater than the maximum number of additional partitions
3366 in the mode page, the second field is used. Otherwise the first field is used.
3367
3368 For Seagate DDS drives the page length must be 8 when no partitions is defined
3369 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3370 is acceptable also to some other old drives and enforced if the first partition
3371 size field is used for the first additional partition size.
8038e645
KM		 3372
3373 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
1da177e4
LT		 3374 */
3375static int partition_tape(struct scsi_tape *STp, int size)
3376{
1da177e4 3377 int result;
8038e645
KM		 3378 int target_partition;
3379 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
1da177e4 3380 int pgo, psd_cnt, psdo;
8038e645 3381 int psum = PP_MSK_PSUM_MB, units = 0;
1da177e4
LT		 3382 unsigned char *bp;
3383
3384 result = read_mode_page(STp, PART_PAGE, 0);
3385 if (result) {
b30d8bca 3386 DEBC_printk(STp, "Can't read partition mode page.\n");
1da177e4
LT		 3387 return result;
3388 }
8038e645
KM		 3389 target_partition = 1;
3390 if (size < 0) {
3391 target_partition = 0;
3392 size = -size;
3393 }
3394
1da177e4
LT		 3395 /* The mode page is in the buffer. Let's modify it and write it. */
3396 bp = (STp->buffer)->b_data;
3397 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
b30d8bca
HR		 3398 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3399 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
1da177e4
LT		 3400
3401 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
8038e645
KM		 3402
3403 if (scsi3) {
3404 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3405 if (needs_format && size == 0) {
3406 /* No need to write the mode page when clearing
3407 * partitioning
3408 */
3409 DEBC_printk(STp, "Formatting tape with one partition.\n");
3410 result = format_medium(STp, 0);
3411 goto out;
3412 }
3413 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3414 psd_cnt = 2;
3415 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3416 /* Use units scaling for large partitions if the device
3417 * suggests it and no precision lost. Required for IBM
3418 * TS1140/50 drives that don't support MB units.
3419 */
3420 if (size >= 1000 && (size % 1000) == 0) {
3421 size /= 1000;
3422 psum = PP_MSK_PSUM_UNITS;
3423 units = 9; /* GB */
3424 }
3425 }
3426 /* Try it anyway if too large to specify in MB */
3427 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3428 size /= 1000;
3429 psum = PP_MSK_PSUM_UNITS;
3430 units = 9; /* GB */
3431 }
3432 }
3433
3434 if (size >= 65535 || /* Does not fit into two bytes */
3435 (target_partition == 0 && psd_cnt < 2)) {
3436 result = -EINVAL;
3437 goto out;
3438 }
3439
1da177e4 3440 psdo = pgo + PART_PAGE_FIXED_LENGTH;
8038e645
KM		 3441 /* The second condition is for HP DDS which use only one partition size
3442 * descriptor
3443 */
3444 if (target_partition > 0 &&
3445 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3446 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3447 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
1da177e4
LT		 3448 psdo += 2;
3449 }
3450 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3451
b30d8bca 3452 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
1da177e4 3453 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
b30d8bca 3454 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
1da177e4 3455
8038e645 3456 if (size == 0) {
1da177e4
LT		 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3458 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3459 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
b30d8bca 3460 DEBC_printk(STp, "Formatting tape with one partition.\n");
1da177e4
LT		 3461 } else {
3462 bp[psdo] = (size >> 8) & 0xff;
3463 bp[psdo + 1] = size & 0xff;
8038e645
KM		 3464 if (target_partition == 0)
3465 bp[psdo + 2] = bp[psdo + 3] = 0xff;
1da177e4
LT		 3466 bp[pgo + 3] = 1;
3467 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3468 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
8038e645
KM		 3469 DEBC_printk(STp,
3470 "Formatting tape with two partitions (%i = %d MB).\n",
3471 target_partition, units > 0 ? size * 1000 : size);
1da177e4
LT		 3472 }
3473 bp[pgo + PP_OFF_PART_UNITS] = 0;
3474 bp[pgo + PP_OFF_RESERVED] = 0;
8038e645
KM		 3475 if (size != 1 || units != 0) {
3476 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3477 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3478 bp[pgo + PP_OFF_PART_UNITS] = units;
3479 } else
3480 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3481 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3482 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
1da177e4
LT		 3483
3484 result = write_mode_page(STp, PART_PAGE, 1);
8038e645
KM		 3485
3486 if (!result && needs_format)
3487 result = format_medium(STp, 1);
3488
1da177e4 3489 if (result) {
b30d8bca 3490 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
1da177e4
LT		 3491 result = (-EIO);
3492 }
3493
8038e645 3494out:
1da177e4
LT		 3495 return result;
3496}
3497\f
3498
3499
3500/* The ioctl command */
fd66c1b4 3501static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
1da177e4
LT		 3502{
3503 int i, cmd_nr, cmd_type, bt;
3504 int retval = 0;
3505 unsigned int blk;
3506 struct scsi_tape *STp = file->private_data;
3507 struct st_modedef *STm;
3508 struct st_partstat *STps;
1da177e4
LT		 3509 void __user *p = (void __user *)arg;
3510
28f85009 3511 if (mutex_lock_interruptible(&STp->lock))
1da177e4
LT		 3512 return -ERESTARTSYS;
3513
b30d8bca 3514 DEB(
1da177e4 3515 if (debugging && !STp->in_use) {
b30d8bca 3516 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
1da177e4
LT		 3517 retval = (-EIO);
3518 goto out;
3519 } ) /* end DEB */
3520
3521 STm = &(STp->modes[STp->current_mode]);
3522 STps = &(STp->ps[STp->partition]);
3523
3524 /*
3525 * If we are in the middle of error recovery, don't let anyone
3526 * else try and use this device. Also, if error recovery fails, it
3527 * may try and take the device offline, in which case all further
3528 * access to the device is prohibited.
3529 */
906d15fb
CH		 3530 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3531 file->f_flags & O_NDELAY);
3532 if (retval)
1da177e4 3533 goto out;
1da177e4
LT		 3534
3535 cmd_type = _IOC_TYPE(cmd_in);
3536 cmd_nr = _IOC_NR(cmd_in);
3537
3538 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3539 struct mtop mtc;
3540
3541 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3542 retval = (-EINVAL);
3543 goto out;
3544 }
3545
3546 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3547 if (i) {
3548 retval = (-EFAULT);
3549 goto out;
3550 }
3551
3552 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
b30d8bca
HR		 3553 st_printk(KERN_WARNING, STp,
3554 "MTSETDRVBUFFER only allowed for root.\n");
1da177e4
LT		 3555 retval = (-EPERM);
3556 goto out;
3557 }
3558 if (!STm->defined &&
3559 (mtc.mt_op != MTSETDRVBUFFER &&
3560 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3561 retval = (-ENXIO);
3562 goto out;
3563 }
3564
3565 if (!STp->pos_unknown) {
3566
3567 if (STps->eof == ST_FM_HIT) {
3568 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3569 mtc.mt_op == MTEOM) {
3570 mtc.mt_count -= 1;
3571 if (STps->drv_file >= 0)
3572 STps->drv_file += 1;
3573 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3574 mtc.mt_count += 1;
3575 if (STps->drv_file >= 0)
3576 STps->drv_file += 1;
3577 }
3578 }
3579
3580 if (mtc.mt_op == MTSEEK) {
3581 /* Old position must be restored if partition will be
3582 changed */
3583 i = !STp->can_partitions ||
3584 (STp->new_partition != STp->partition);
3585 } else {
3586 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3587 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3588 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3589 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3590 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3591 mtc.mt_op == MTCOMPRESSION;
3592 }
3593 i = flush_buffer(STp, i);
3594 if (i < 0) {
3595 retval = i;
3596 goto out;
3597 }
3598 if (STps->rw == ST_WRITING &&
3599 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3600 mtc.mt_op == MTSEEK ||
3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3602 i = st_int_ioctl(STp, MTWEOF, 1);
3603 if (i < 0) {
3604 retval = i;
3605 goto out;
3606 }
3607 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3608 mtc.mt_count++;
3609 STps->rw = ST_IDLE;
3610 }
3611
3612 } else {
3613 /*
3614 * If there was a bus reset, block further access
3615 * to this device. If the user wants to rewind the tape,
3616 * then reset the flag and allow access again.
3617 */
3618 if (mtc.mt_op != MTREW &&
3619 mtc.mt_op != MTOFFL &&
3620 mtc.mt_op != MTRETEN &&
3621 mtc.mt_op != MTERASE &&
3622 mtc.mt_op != MTSEEK &&
3623 mtc.mt_op != MTEOM) {
3624 retval = (-EIO);
3625 goto out;
3626 }
3627 reset_state(STp);
3628 /* remove this when the midlevel properly clears was_reset */
3629 STp->device->was_reset = 0;
3630 }
3631
3632 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3633 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3634 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3635 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3636
3637 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3638 do_door_lock(STp, 0); /* Ignore result! */
3639
3640 if (mtc.mt_op == MTSETDRVBUFFER &&
3641 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3642 retval = st_set_options(STp, mtc.mt_count);
3643 goto out;
3644 }
3645
3646 if (mtc.mt_op == MTSETPART) {
3647 if (!STp->can_partitions ||
3648 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3649 retval = (-EINVAL);
3650 goto out;
3651 }
3652 if (mtc.mt_count >= STp->nbr_partitions &&
3653 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3654 retval = (-EIO);
3655 goto out;
3656 }
3657 if (mtc.mt_count >= STp->nbr_partitions) {
3658 retval = (-EINVAL);
3659 goto out;
3660 }
3661 STp->new_partition = mtc.mt_count;
3662 retval = 0;
3663 goto out;
3664 }
3665
3666 if (mtc.mt_op == MTMKPART) {
3667 if (!STp->can_partitions) {
3668 retval = (-EINVAL);
3669 goto out;
3670 }
8038e645
KM		 3671 i = do_load_unload(STp, file, 1);
3672 if (i < 0) {
3673 retval = i;
3674 goto out;
3675 }
3676 i = partition_tape(STp, mtc.mt_count);
3677 if (i < 0) {
1da177e4
LT		 3678 retval = i;
3679 goto out;
3680 }
3681 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3682 STp->ps[i].rw = ST_IDLE;
3683 STp->ps[i].at_sm = 0;
3684 STp->ps[i].last_block_valid = 0;
3685 }
3686 STp->partition = STp->new_partition = 0;
8038e645 3687 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
1da177e4
LT		 3688 STps->drv_block = STps->drv_file = 0;
3689 retval = 0;
3690 goto out;
3691 }
3692
3693 if (mtc.mt_op == MTSEEK) {
3694 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3695 if (!STp->can_partitions)
3696 STp->ps[0].rw = ST_IDLE;
3697 retval = i;
3698 goto out;
3699 }
3700
3701 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3702 retval = do_load_unload(STp, file, 0);
3703 goto out;
3704 }
3705
3706 if (mtc.mt_op == MTLOAD) {
3707 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3708 goto out;
3709 }
3710
3711 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3712 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3713 goto out;
3714 }
3715
3716 if (STp->can_partitions && STp->ready == ST_READY &&
3717 (i = switch_partition(STp)) < 0) {
3718 retval = i;
3719 goto out;
3720 }
3721
3722 if (mtc.mt_op == MTCOMPRESSION)
3723 retval = st_compression(STp, (mtc.mt_count & 1));
3724 else
3725 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3726 goto out;
3727 }
3728 if (!STm->defined) {
3729 retval = (-ENXIO);
3730 goto out;
3731 }
3732
3733 if ((i = flush_buffer(STp, 0)) < 0) {
3734 retval = i;
3735 goto out;
3736 }
3737 if (STp->can_partitions &&
3738 (i = switch_partition(STp)) < 0) {
3739 retval = i;
3740 goto out;
3741 }
3742
3743 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3744 struct mtget mt_status;
3745
3746 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3747 retval = (-EINVAL);
3748 goto out;
3749 }
3750
3751 mt_status.mt_type = STp->tape_type;
3752 mt_status.mt_dsreg =
3753 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3754 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3755 mt_status.mt_blkno = STps->drv_block;
3756 mt_status.mt_fileno = STps->drv_file;
3757 if (STp->block_size != 0) {
3758 if (STps->rw == ST_WRITING)
3759 mt_status.mt_blkno +=
3760 (STp->buffer)->buffer_bytes / STp->block_size;
3761 else if (STps->rw == ST_READING)
3762 mt_status.mt_blkno -=
3763 ((STp->buffer)->buffer_bytes +
3764 STp->block_size - 1) / STp->block_size;
3765 }
3766
3767 mt_status.mt_gstat = 0;
3768 if (STp->drv_write_prot)
3769 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3770 if (mt_status.mt_blkno == 0) {
3771 if (mt_status.mt_fileno == 0)
3772 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3773 else
3774 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3775 }
3776 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3777 mt_status.mt_resid = STp->partition;
3778 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3779 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3780 else if (STps->eof >= ST_EOM_OK)
3781 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3782 if (STp->density == 1)
3783 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3784 else if (STp->density == 2)
3785 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3786 else if (STp->density == 3)
3787 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3788 if (STp->ready == ST_READY)
3789 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3790 if (STp->ready == ST_NO_TAPE)
3791 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3792 if (STps->at_sm)
3793 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3794 if (STm->do_async_writes ||
3795 (STm->do_buffer_writes && STp->block_size != 0) ||
3796 STp->drv_buffer != 0)
3797 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3798 if (STp->cleaning_req)
3799 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3800
3801 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3802 if (i) {
3803 retval = (-EFAULT);
3804 goto out;
3805 }
3806
3807 STp->recover_reg = 0; /* Clear after read */
3808 retval = 0;
3809 goto out;
3810 } /* End of MTIOCGET */
3811 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3812 struct mtpos mt_pos;
3813 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3814 retval = (-EINVAL);
3815 goto out;
3816 }
3817 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3818 retval = i;
3819 goto out;
3820 }
3821 mt_pos.mt_blkno = blk;
3822 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3823 if (i)
3824 retval = (-EFAULT);
3825 goto out;
3826 }
28f85009 3827 mutex_unlock(&STp->lock);
1da177e4
LT		 3828 switch (cmd_in) {
3829 case SCSI_IOCTL_GET_IDLUN:
3830 case SCSI_IOCTL_GET_BUS_NUMBER:
3831 break;
3832 default:
16c4b3e2
KM		 3833 if ((cmd_in == SG_IO ||
3834 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3835 cmd_in == CDROM_SEND_PACKET) &&
3836 !capable(CAP_SYS_RAWIO))
1da177e4
LT		 3837 i = -EPERM;
3838 else
74f3c8af
AV		 3839 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3840 file->f_mode, cmd_in, p);
1da177e4
LT		 3841 if (i != -ENOTTY)
3842 return i;
3843 break;
3844 }
16c4b3e2
KM		 3845 retval = scsi_ioctl(STp->device, cmd_in, p);
3846 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3847 STp->rew_at_close = 0;
3848 STp->ready = ST_NO_TAPE;
3849 }
3850 return retval;
1da177e4
LT		 3851
3852 out:
28f85009 3853 mutex_unlock(&STp->lock);
1da177e4
LT		 3854 return retval;
3855}
3856
3857#ifdef CONFIG_COMPAT
3858static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3859{
3860 struct scsi_tape *STp = file->private_data;
3861 struct scsi_device *sdev = STp->device;
3862 int ret = -ENOIOCTLCMD;
3863 if (sdev->host->hostt->compat_ioctl) {
3864
3865 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3866
3867 }
3868 return ret;
3869}
3870#endif
3871
3872\f
3873
3874/* Try to allocate a new tape buffer. Calling function must not hold
3875 dev_arr_lock. */
f409d6cc 3876static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
1da177e4 3877{
1da177e4
LT		 3878 struct st_buffer *tb;
3879
f409d6cc 3880 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
1da177e4
LT		 3881 if (!tb) {
3882 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3883 return NULL;
3884 }
1ac63cf5 3885 tb->frp_segs = 0;
1da177e4 3886 tb->use_sg = max_sg;
1da177e4 3887 tb->dma = need_dma;
f409d6cc 3888 tb->buffer_size = 0;
1da177e4 3889
f409d6cc
FT		 3890 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3891 GFP_ATOMIC);
d0e1ae31
FT		 3892 if (!tb->reserved_pages) {
3893 kfree(tb);
3894 return NULL;
3895 }
3896
1da177e4
LT		 3897 return tb;
3898}
3899
3900
3901/* Try to allocate enough space in the tape buffer */
8f78fc5e
KM		 3902#define ST_MAX_ORDER 6
3903
1da177e4
LT		 3904static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3905{
769989a4 3906 int segs, max_segs, b_size, order, got;
c53033f6 3907 gfp_t priority;
1da177e4
LT		 3908
3909 if (new_size <= STbuffer->buffer_size)
3910 return 1;
3911
3912 if (STbuffer->buffer_size <= PAGE_SIZE)
3913 normalize_buffer(STbuffer); /* Avoid extra segment */
3914
3915 max_segs = STbuffer->use_sg;
1da177e4
LT		 3916
3917 priority = GFP_KERNEL | __GFP_NOWARN;
3918 if (need_dma)
3919 priority |= GFP_DMA;
9c905966 3920
08c95832
FT		 3921 if (STbuffer->cleared)
3922 priority |= __GFP_ZERO;
3923
9c905966 3924 if (STbuffer->frp_segs) {
c982c368 3925 order = STbuffer->reserved_page_order;
08c95832 3926 b_size = PAGE_SIZE << order;
9c905966
FT		 3927 } else {
3928 for (b_size = PAGE_SIZE, order = 0;
46081b16
FT		 3929 order < ST_MAX_ORDER &&
3930 max_segs * (PAGE_SIZE << order) < new_size;
8f78fc5e 3931 order++, b_size *= 2)
9c905966 3932 ; /* empty */
373daacf 3933 STbuffer->reserved_page_order = order;
9c905966 3934 }
8f78fc5e
KM		 3935 if (max_segs * (PAGE_SIZE << order) < new_size) {
3936 if (order == ST_MAX_ORDER)
3937 return 0;
3938 normalize_buffer(STbuffer);
3939 return enlarge_buffer(STbuffer, new_size, need_dma);
3940 }
1da177e4
LT		 3941
3942 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3943 segs < max_segs && got < new_size;) {
08c95832
FT		 3944 struct page *page;
3945
3946 page = alloc_pages(priority, order);
3947 if (!page) {
1da177e4
LT		 3948 DEB(STbuffer->buffer_size = got);
3949 normalize_buffer(STbuffer);
3950 return 0;
3951 }
08c95832 3952
1da177e4
LT		 3953 STbuffer->frp_segs += 1;
3954 got += b_size;
3955 STbuffer->buffer_size = got;
08c95832 3956 STbuffer->reserved_pages[segs] = page;
1da177e4
LT		 3957 segs++;
3958 }
08c95832 3959 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
1da177e4
LT		 3960
3961 return 1;
3962}
3963
3964
40f6b36c
KM		 3965/* Make sure that no data from previous user is in the internal buffer */
3966static void clear_buffer(struct st_buffer * st_bp)
3967{
3968 int i;
3969
3970 for (i=0; i < st_bp->frp_segs; i++)
08c95832 3971 memset(page_address(st_bp->reserved_pages[i]), 0,
c982c368 3972 PAGE_SIZE << st_bp->reserved_page_order);
40f6b36c
KM		 3973 st_bp->cleared = 1;
3974}
3975
3976
1da177e4
LT		 3977/* Release the extra buffer */
3978static void normalize_buffer(struct st_buffer * STbuffer)
3979{
c982c368 3980 int i, order = STbuffer->reserved_page_order;
1da177e4 3981
1ac63cf5 3982 for (i = 0; i < STbuffer->frp_segs; i++) {
08c95832
FT		 3983 __free_pages(STbuffer->reserved_pages[i], order);
3984 STbuffer->buffer_size -= (PAGE_SIZE << order);
1da177e4 3985 }
1ac63cf5 3986 STbuffer->frp_segs = 0;
8b05b773 3987 STbuffer->sg_segs = 0;
c982c368 3988 STbuffer->reserved_page_order = 0;
d0e1ae31 3989 STbuffer->map_data.offset = 0;
1da177e4
LT		 3990}
3991
3992
3993/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3994 negative error code. */
3995static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3996{
3997 int i, cnt, res, offset;
c982c368 3998 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 3999
4000 for (i = 0, offset = st_bp->buffer_bytes;
08c95832
FT		 4001 i < st_bp->frp_segs && offset >= length; i++)
4002 offset -= length;
1da177e4
LT		 4003 if (i == st_bp->frp_segs) { /* Should never happen */
4004 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4005 return (-EIO);
4006 }
4007 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4008 struct page *page = st_bp->reserved_pages[i];
4009 cnt = length - offset < do_count ? length - offset : do_count;
4010 res = copy_from_user(page_address(page) + offset, ubp, cnt);
1da177e4
LT		 4011 if (res)
4012 return (-EFAULT);
4013 do_count -= cnt;
4014 st_bp->buffer_bytes += cnt;
4015 ubp += cnt;
4016 offset = 0;
4017 }
4018 if (do_count) /* Should never happen */
4019 return (-EIO);
4020
4021 return 0;
4022}
4023
4024
4025/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4026 negative error code. */
4027static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4028{
4029 int i, cnt, res, offset;
c982c368 4030 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4031
4032 for (i = 0, offset = st_bp->read_pointer;
08c95832
FT		 4033 i < st_bp->frp_segs && offset >= length; i++)
4034 offset -= length;
1da177e4
LT		 4035 if (i == st_bp->frp_segs) { /* Should never happen */
4036 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4037 return (-EIO);
4038 }
4039 for (; i < st_bp->frp_segs && do_count > 0; i++) {
08c95832
FT		 4040 struct page *page = st_bp->reserved_pages[i];
4041 cnt = length - offset < do_count ? length - offset : do_count;
4042 res = copy_to_user(ubp, page_address(page) + offset, cnt);
1da177e4
LT		 4043 if (res)
4044 return (-EFAULT);
4045 do_count -= cnt;
4046 st_bp->buffer_bytes -= cnt;
4047 st_bp->read_pointer += cnt;
4048 ubp += cnt;
4049 offset = 0;
4050 }
4051 if (do_count) /* Should never happen */
4052 return (-EIO);
4053
4054 return 0;
4055}
4056
4057
4058/* Move data towards start of buffer */
4059static void move_buffer_data(struct st_buffer * st_bp, int offset)
4060{
4061 int src_seg, dst_seg, src_offset = 0, dst_offset;
4062 int count, total;
c982c368 4063 int length = PAGE_SIZE << st_bp->reserved_page_order;
1da177e4
LT		 4064
4065 if (offset == 0)
4066 return;
4067
4068 total=st_bp->buffer_bytes - offset;
4069 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4070 src_offset = offset;
08c95832 4071 if (src_offset < length)
1da177e4 4072 break;
08c95832 4073 offset -= length;
1da177e4
LT		 4074 }
4075
4076 st_bp->buffer_bytes = st_bp->read_pointer = total;
4077 for (dst_seg=dst_offset=0; total > 0; ) {
08c95832
FT		 4078 struct page *dpage = st_bp->reserved_pages[dst_seg];
4079 struct page *spage = st_bp->reserved_pages[src_seg];
4080
4081 count = min(length - dst_offset, length - src_offset);
4082 memmove(page_address(dpage) + dst_offset,
4083 page_address(spage) + src_offset, count);
1da177e4 4084 src_offset += count;
08c95832 4085 if (src_offset >= length) {
1da177e4
LT		 4086 src_seg++;
4087 src_offset = 0;
4088 }
4089 dst_offset += count;
08c95832 4090 if (dst_offset >= length) {
1da177e4
LT		 4091 dst_seg++;
4092 dst_offset = 0;
4093 }
4094 total -= count;
4095 }
4096}
4097
1da177e4
LT		 4098/* Validate the options from command line or module parameters */
4099static void validate_options(void)
4100{
4101 if (buffer_kbs > 0)
4102 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4103 if (max_sg_segs >= ST_FIRST_SG)
4104 st_max_sg_segs = max_sg_segs;
4105}
4106
4107#ifndef MODULE
4108/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4109 */
4110static int __init st_setup(char *str)
4111{
4112 int i, len, ints[5];
4113 char *stp;
4114
4115 stp = get_options(str, ARRAY_SIZE(ints), ints);
4116
4117 if (ints[0] > 0) {
4118 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4119 if (parms[i].val)
4120 *parms[i].val = ints[i + 1];
4121 } else {
4122 while (stp != NULL) {
4123 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4124 len = strlen(parms[i].name);
4125 if (!strncmp(stp, parms[i].name, len) &&
4126 (*(stp + len) == ':' || *(stp + len) == '=')) {
4127 if (parms[i].val)
4128 *parms[i].val =
4129 simple_strtoul(stp + len + 1, NULL, 0);
4130 else
4131 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4132 parms[i].name);
4133 break;
4134 }
4135 }
6391a113 4136 if (i >= ARRAY_SIZE(parms))
1da177e4
LT		 4137 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4138 stp);
4139 stp = strchr(stp, ',');
4140 if (stp)
4141 stp++;
4142 }
4143 }
4144
4145 validate_options();
4146
4147 return 1;
4148}
4149
4150__setup("st=", st_setup);
4151
4152#endif
4153
00977a59 4154static const struct file_operations st_fops =
1da177e4
LT		 4155{
4156 .owner = THIS_MODULE,
4157 .read = st_read,
4158 .write = st_write,
fd66c1b4 4159 .unlocked_ioctl = st_ioctl,
1da177e4
LT		 4160#ifdef CONFIG_COMPAT
4161 .compat_ioctl = st_compat_ioctl,
4162#endif
4163 .open = st_open,
4164 .flush = st_flush,
4165 .release = st_release,
b4d878e2 4166 .llseek = noop_llseek,
1da177e4
LT		 4167};
4168
26898afd
JM		 4169static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4170{
4171 int i, error;
4172 dev_t cdev_devno;
4173 struct cdev *cdev;
4174 struct device *dev;
4175 struct st_modedef *STm = &(tape->modes[mode]);
4176 char name[10];
4177 int dev_num = tape->index;
4178
4179 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4180
4181 cdev = cdev_alloc();
4182 if (!cdev) {
4183 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4184 error = -ENOMEM;
4185 goto out;
4186 }
4187 cdev->owner = THIS_MODULE;
4188 cdev->ops = &st_fops;
ab08ee14 4189 STm->cdevs[rew] = cdev;
26898afd
JM		 4190
4191 error = cdev_add(cdev, cdev_devno, 1);
4192 if (error) {
4193 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4194 rew ? "non" : "auto", mode);
4195 pr_err("st%d: Device not attached.\n", dev_num);
4196 goto out_free;
4197 }
26898afd
JM		 4198
4199 i = mode << (4 - ST_NBR_MODE_BITS);
4200 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4201 tape->disk->disk_name, st_formats[i]);
4202
4203 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4204 cdev_devno, &tape->modes[mode], "%s", name);
4205 if (IS_ERR(dev)) {
4206 pr_err("st%d: device_create failed\n", dev_num);
4207 error = PTR_ERR(dev);
4208 goto out_free;
4209 }
4210
4211 STm->devs[rew] = dev;
4212
4213 return 0;
4214out_free:
4215 cdev_del(STm->cdevs[rew]);
26898afd 4216out:
ab08ee14
ML		 4217 STm->cdevs[rew] = NULL;
4218 STm->devs[rew] = NULL;
26898afd
JM		 4219 return error;
4220}
4221
4222static int create_cdevs(struct scsi_tape *tape)
4223{
4224 int mode, error;
4225 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4226 error = create_one_cdev(tape, mode, 0);
4227 if (error)
4228 return error;
4229 error = create_one_cdev(tape, mode, 1);
4230 if (error)
4231 return error;
4232 }
4233
4234 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4235 &tape->modes[0].devs[0]->kobj, "tape");
4236}
4237
4238static void remove_cdevs(struct scsi_tape *tape)
4239{
4240 int mode, rew;
4241 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4242 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4243 struct st_modedef *STm = &(tape->modes[mode]);
4244 for (rew = 0; rew < 2; rew++) {
4245 if (STm->cdevs[rew])
4246 cdev_del(STm->cdevs[rew]);
4247 if (STm->devs[rew])
4248 device_unregister(STm->devs[rew]);
4249 }
4250 }
4251}
4252
1da177e4
LT		 4253static int st_probe(struct device *dev)
4254{
4255 struct scsi_device *SDp = to_scsi_device(dev);
4256 struct gendisk *disk = NULL;
1da177e4
LT		 4257 struct scsi_tape *tpnt = NULL;
4258 struct st_modedef *STm;
4259 struct st_partstat *STps;
4260 struct st_buffer *buffer;
b98c52b5 4261 int i, error;
1da177e4 4262 char *stp;
1da177e4
LT		 4263
4264 if (SDp->type != TYPE_TAPE)
4265 return -ENODEV;
4266 if ((stp = st_incompatible(SDp))) {
3bf743e7 4267 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
b30d8bca
HR		 4268 sdev_printk(KERN_INFO, SDp,
4269 "st: The suggested driver is %s.\n", stp);
1da177e4
LT		 4270 return -ENODEV;
4271 }
4272
6fe8c1db 4273 scsi_autopm_get_device(SDp);
8a78362c 4274 i = queue_max_segments(SDp->request_queue);
1da177e4
LT		 4275 if (st_max_sg_segs < i)
4276 i = st_max_sg_segs;
f409d6cc 4277 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
1da177e4 4278 if (buffer == NULL) {
b30d8bca
HR		 4279 sdev_printk(KERN_ERR, SDp,
4280 "st: Can't allocate new tape buffer. "
4281 "Device not attached.\n");
1da177e4
LT		 4282 goto out;
4283 }
4284
4285 disk = alloc_disk(1);
4286 if (!disk) {
b30d8bca
HR		 4287 sdev_printk(KERN_ERR, SDp,
4288 "st: out of memory. Device not attached.\n");
1da177e4
LT		 4289 goto out_buffer_free;
4290 }
4291
24669f75 4292 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
1da177e4 4293 if (tpnt == NULL) {
b30d8bca
HR		 4294 sdev_printk(KERN_ERR, SDp,
4295 "st: Can't allocate device descriptor.\n");
1da177e4
LT		 4296 goto out_put_disk;
4297 }
f03a5670 4298 kref_init(&tpnt->kref);
1da177e4 4299 tpnt->disk = disk;
1da177e4
LT		 4300 disk->private_data = &tpnt->driver;
4301 disk->queue = SDp->request_queue;
2b5bebcc
JL		 4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4303 * take queue reference that release_disk() expects. */
4304 if (!blk_get_queue(disk->queue))
4305 goto out_put_disk;
1da177e4 4306 tpnt->driver = &st_template;
1da177e4
LT		 4307
4308 tpnt->device = SDp;
4309 if (SDp->scsi_level <= 2)
4310 tpnt->tape_type = MT_ISSCSI1;
4311 else
4312 tpnt->tape_type = MT_ISSCSI2;
4313
4314 tpnt->buffer = buffer;
f03a5670 4315 tpnt->buffer->last_SRpnt = NULL;
1da177e4
LT		 4316
4317 tpnt->inited = 0;
4318 tpnt->dirty = 0;
4319 tpnt->in_use = 0;
4320 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4321 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4322 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4323 tpnt->density = 0;
4324 tpnt->do_auto_lock = ST_AUTO_LOCK;
4325 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4326 tpnt->can_partitions = 0;
4327 tpnt->two_fm = ST_TWO_FM;
4328 tpnt->fast_mteom = ST_FAST_MTEOM;
4329 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
40f6b36c 4330 tpnt->sili = ST_SILI;
1da177e4 4331 tpnt->immediate = ST_NOWAIT;
c743e44f 4332 tpnt->immediate_filemark = 0;
1da177e4
LT		 4333 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4334 tpnt->partition = 0;
4335 tpnt->new_partition = 0;
4336 tpnt->nbr_partitions = 0;
a02488ed 4337 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
1da177e4
LT		 4338 tpnt->long_timeout = ST_LONG_TIMEOUT;
4339 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4340
1da177e4
LT		 4341 for (i = 0; i < ST_NBR_MODES; i++) {
4342 STm = &(tpnt->modes[i]);
4343 STm->defined = 0;
4344 STm->sysv = ST_SYSV;
4345 STm->defaults_for_writes = 0;
4346 STm->do_async_writes = ST_ASYNC_WRITES;
4347 STm->do_buffer_writes = ST_BUFFER_WRITES;
4348 STm->do_read_ahead = ST_READ_AHEAD;
4349 STm->default_compression = ST_DONT_TOUCH;
4350 STm->default_blksize = (-1); /* No forced size */
4351 STm->default_density = (-1); /* No forced density */
6c648d95 4352 STm->tape = tpnt;
1da177e4
LT		 4353 }
4354
4355 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4356 STps = &(tpnt->ps[i]);
4357 STps->rw = ST_IDLE;
4358 STps->eof = ST_NOEOF;
4359 STps->at_sm = 0;
4360 STps->last_block_valid = 0;
4361 STps->drv_block = (-1);
4362 STps->drv_file = (-1);
4363 }
4364
4365 tpnt->current_mode = 0;
4366 tpnt->modes[0].defined = 1;
4367
4368 tpnt->density_changed = tpnt->compression_changed =
4369 tpnt->blksize_changed = 0;
28f85009 4370 mutex_init(&tpnt->lock);
1da177e4 4371
b98c52b5 4372 idr_preload(GFP_KERNEL);
6c648d95 4373 spin_lock(&st_index_lock);
b98c52b5 4374 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
6c648d95 4375 spin_unlock(&st_index_lock);
b98c52b5
TH		 4376 idr_preload_end();
4377 if (error < 0) {
6c648d95 4378 pr_warn("st: idr allocation failed: %d\n", error);
2b5bebcc 4379 goto out_put_queue;
6c648d95 4380 }
b98c52b5
TH		 4381 tpnt->index = error;
4382 sprintf(disk->disk_name, "st%d", tpnt->index);
05545c92
SS		 4383 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4384 if (tpnt->stats == NULL) {
4385 sdev_printk(KERN_ERR, SDp,
4386 "st: Can't allocate statistics.\n");
4387 goto out_idr_remove;
4388 }
6c648d95
JM		 4389
4390 dev_set_drvdata(dev, tpnt);
1da177e4 4391
1da177e4 4392
26898afd
JM		 4393 error = create_cdevs(tpnt);
4394 if (error)
4395 goto out_remove_devs;
46a243f7 4396 scsi_autopm_put_device(SDp);
1da177e4 4397
42252854 4398 sdev_printk(KERN_NOTICE, SDp,
8b1ea24c 4399 "Attached scsi tape %s\n", tape_name(tpnt));
42252854
KM		 4400 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4401 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4402 queue_dma_alignment(SDp->request_queue) + 1);
1da177e4
LT		 4403
4404 return 0;
4405
26898afd
JM		 4406out_remove_devs:
4407 remove_cdevs(tpnt);
05545c92
SS		 4408 kfree(tpnt->stats);
4409out_idr_remove:
6c648d95 4410 spin_lock(&st_index_lock);
b98c52b5 4411 idr_remove(&st_index_idr, tpnt->index);
6c648d95 4412 spin_unlock(&st_index_lock);
2b5bebcc
JL		 4413out_put_queue:
4414 blk_put_queue(disk->queue);
1da177e4
LT		 4415out_put_disk:
4416 put_disk(disk);
c9475cb0 4417 kfree(tpnt);
1da177e4
LT		 4418out_buffer_free:
4419 kfree(buffer);
4420out:
6fe8c1db 4421 scsi_autopm_put_device(SDp);
1da177e4
LT		 4422 return -ENODEV;
4423};
4424
4425
4426static int st_remove(struct device *dev)
4427{
6c648d95 4428 struct scsi_tape *tpnt = dev_get_drvdata(dev);
6c648d95
JM		 4429 int index = tpnt->index;
4430
4431 scsi_autopm_get_device(to_scsi_device(dev));
26898afd 4432 remove_cdevs(tpnt);
1da177e4 4433
6c648d95
JM		 4434 mutex_lock(&st_ref_mutex);
4435 kref_put(&tpnt->kref, scsi_tape_release);
4436 mutex_unlock(&st_ref_mutex);
4437 spin_lock(&st_index_lock);
4438 idr_remove(&st_index_idr, index);
4439 spin_unlock(&st_index_lock);
1da177e4
LT		 4440 return 0;
4441}
4442
f03a5670
KM		 4443/**
4444 * scsi_tape_release - Called to free the Scsi_Tape structure
4445 * @kref: pointer to embedded kref
4446 *
0b950672 4447 * st_ref_mutex must be held entering this routine. Because it is
f03a5670
KM		 4448 * called on last put, you should always use the scsi_tape_get()
4449 * scsi_tape_put() helpers which manipulate the semaphore directly
4450 * and never do a direct kref_put().
4451 **/
4452static void scsi_tape_release(struct kref *kref)
4453{
4454 struct scsi_tape *tpnt = to_scsi_tape(kref);
4455 struct gendisk *disk = tpnt->disk;
4456
4457 tpnt->device = NULL;
4458
4459 if (tpnt->buffer) {
f03a5670 4460 normalize_buffer(tpnt->buffer);
d0e1ae31 4461 kfree(tpnt->buffer->reserved_pages);
f03a5670
KM		 4462 kfree(tpnt->buffer);
4463 }
4464
4465 disk->private_data = NULL;
4466 put_disk(disk);
05545c92 4467 kfree(tpnt->stats);
f03a5670
KM		 4468 kfree(tpnt);
4469 return;
4470}
4471
af23782b
JM		 4472static struct class st_sysfs_class = {
4473 .name = "scsi_tape",
c69c6be5 4474 .dev_groups = st_dev_groups,
af23782b
JM		 4475};
4476
1da177e4
LT		 4477static int __init init_st(void)
4478{
13026a6b
JG		 4479 int err;
4480
1da177e4
LT		 4481 validate_options();
4482
13026a6b 4483 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
1da177e4
LT		 4484 verstr, st_fixed_buffer_size, st_max_sg_segs);
4485
2bec708a
LO		 4486 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4487 if (debugging) {
4488 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4489 debugging);
4490 }
4491
af23782b
JM		 4492 err = class_register(&st_sysfs_class);
4493 if (err) {
4494 pr_err("Unable register sysfs class for SCSI tapes\n");
4495 return err;
1da177e4
LT		 4496 }
4497
13026a6b
JG		 4498 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4499 ST_MAX_TAPE_ENTRIES, "st");
4500 if (err) {
4501 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4502 SCSI_TAPE_MAJOR);
4503 goto err_class;
1da177e4
LT		 4504 }
4505
13026a6b
JG		 4506 err = scsi_register_driver(&st_template.gendrv);
4507 if (err)
4508 goto err_chrdev;
4509
13026a6b
JG		 4510 return 0;
4511
13026a6b
JG		 4512err_chrdev:
4513 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4514 ST_MAX_TAPE_ENTRIES);
4515err_class:
af23782b 4516 class_unregister(&st_sysfs_class);
13026a6b 4517 return err;
1da177e4
LT		 4518}
4519
4520static void __exit exit_st(void)
4521{
1da177e4
LT		 4522 scsi_unregister_driver(&st_template.gendrv);
4523 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4524 ST_MAX_TAPE_ENTRIES);
af23782b 4525 class_unregister(&st_sysfs_class);
2d3a5d21 4526 idr_destroy(&st_index_idr);
1da177e4
LT		 4527 printk(KERN_INFO "st: Unloaded.\n");
4528}
4529
4530module_init(init_st);
4531module_exit(exit_st);
4532
4533
4534/* The sysfs driver interface. Read-only at the moment */
10978e48 4535static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
1da177e4 4536{
10978e48 4537 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
1da177e4 4538}
10978e48 4539static DRIVER_ATTR_RO(try_direct_io);
1da177e4 4540
10978e48 4541static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
1da177e4 4542{
10978e48 4543 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
1da177e4 4544}
10978e48 4545static DRIVER_ATTR_RO(fixed_buffer_size);
1da177e4 4546
10978e48 4547static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
1da177e4 4548{
10978e48 4549 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
1da177e4 4550}
10978e48 4551static DRIVER_ATTR_RO(max_sg_segs);
1da177e4 4552
10978e48 4553static ssize_t version_show(struct device_driver *ddd, char *buf)
1da177e4 4554{
10978e48 4555 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
1da177e4 4556}
10978e48 4557static DRIVER_ATTR_RO(version);
1da177e4 4558
d9b43a10
SS		 4559#if DEBUG
4560static ssize_t debug_flag_store(struct device_driver *ddp,
4561 const char *buf, size_t count)
4562{
4563/* We only care what the first byte of the data is the rest is unused.
4564 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4565 * other values have -EINVAL returned if they are passed in.
4566 */
4567 if (count > 0) {
4568 if (buf[0] == '0') {
4569 debugging = NO_DEBUG;
4570 return count;
4571 } else if (buf[0] == '1') {
4572 debugging = 1;
4573 return count;
4574 }
4575 }
4576 return -EINVAL;
4577}
4578
4579static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4580{
4581 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4582}
4583static DRIVER_ATTR_RW(debug_flag);
4584#endif
4585
442d7562
SS		 4586static struct attribute *st_drv_attrs[] = {
4587 &driver_attr_try_direct_io.attr,
4588 &driver_attr_fixed_buffer_size.attr,
4589 &driver_attr_max_sg_segs.attr,
4590 &driver_attr_version.attr,
d9b43a10
SS		 4591#if DEBUG
4592 &driver_attr_debug_flag.attr,
4593#endif
442d7562
SS		 4594 NULL,
4595};
4596ATTRIBUTE_GROUPS(st_drv);
1da177e4 4597
1da177e4 4598/* The sysfs simple class interface */
ee959b00 4599static ssize_t
af23782b 4600defined_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4 4601{
7d15d6a4 4602 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4603 ssize_t l = 0;
4604
4605 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4606 return l;
4607}
c69c6be5 4608static DEVICE_ATTR_RO(defined);
1da177e4 4609
ee959b00 4610static ssize_t
af23782b
JM		 4611default_blksize_show(struct device *dev, struct device_attribute *attr,
4612 char *buf)
1da177e4 4613{
7d15d6a4 4614 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4615 ssize_t l = 0;
4616
4617 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4618 return l;
4619}
c69c6be5 4620static DEVICE_ATTR_RO(default_blksize);
1da177e4 4621
ee959b00 4622static ssize_t
af23782b
JM		 4623default_density_show(struct device *dev, struct device_attribute *attr,
4624 char *buf)
1da177e4 4625{
7d15d6a4 4626 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4627 ssize_t l = 0;
4628 char *fmt;
4629
4630 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4631 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4632 return l;
4633}
c69c6be5 4634static DEVICE_ATTR_RO(default_density);
1da177e4 4635
ee959b00 4636static ssize_t
af23782b
JM		 4637default_compression_show(struct device *dev, struct device_attribute *attr,
4638 char *buf)
1da177e4 4639{
7d15d6a4 4640 struct st_modedef *STm = dev_get_drvdata(dev);
1da177e4
LT		 4641 ssize_t l = 0;
4642
4643 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4644 return l;
4645}
c69c6be5 4646static DEVICE_ATTR_RO(default_compression);
1da177e4 4647
ee959b00 4648static ssize_t
af23782b 4649options_show(struct device *dev, struct device_attribute *attr, char *buf)
b174be02 4650{
7d15d6a4 4651 struct st_modedef *STm = dev_get_drvdata(dev);
6c648d95
JM		 4652 struct scsi_tape *STp = STm->tape;
4653 int options;
b174be02
KM		 4654 ssize_t l = 0;
4655
b174be02
KM		 4656 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4657 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4658 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4659 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4660 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4661 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4662 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4663 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4664 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4665 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4666 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4667 options |= STm->sysv ? MT_ST_SYSV : 0;
4668 options |= STp->immediate ? MT_ST_NOWAIT : 0;
c743e44f 4669 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
b174be02
KM		 4670 options |= STp->sili ? MT_ST_SILI : 0;
4671
4672 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4673 return l;
4674}
c69c6be5
GKH		 4675static DEVICE_ATTR_RO(options);
4676
05545c92
SS		 4677/* Support for tape stats */
4678
4679/**
4680 * read_cnt_show - return read count - count of reads made from tape drive
4681 * @dev: struct device
4682 * @attr: attribute structure
4683 * @buf: buffer to return formatted data in
4684 */
4685static ssize_t read_cnt_show(struct device *dev,
4686 struct device_attribute *attr, char *buf)
4687{
4688 struct st_modedef *STm = dev_get_drvdata(dev);
4689
4690 return sprintf(buf, "%lld",
4691 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4692}
4693static DEVICE_ATTR_RO(read_cnt);
4694
4695/**
4696 * read_byte_cnt_show - return read byte count - tape drives
4697 * may use blocks less than 512 bytes this gives the raw byte count of
4698 * of data read from the tape drive.
4699 * @dev: struct device
4700 * @attr: attribute structure
4701 * @buf: buffer to return formatted data in
4702 */
4703static ssize_t read_byte_cnt_show(struct device *dev,
4704 struct device_attribute *attr, char *buf)
4705{
4706 struct st_modedef *STm = dev_get_drvdata(dev);
4707
4708 return sprintf(buf, "%lld",
4709 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4710}
4711static DEVICE_ATTR_RO(read_byte_cnt);
4712
4713/**
4714 * read_us_show - return read us - overall time spent waiting on reads in ns.
4715 * @dev: struct device
4716 * @attr: attribute structure
4717 * @buf: buffer to return formatted data in
4718 */
4719static ssize_t read_ns_show(struct device *dev,
4720 struct device_attribute *attr, char *buf)
4721{
4722 struct st_modedef *STm = dev_get_drvdata(dev);
4723
4724 return sprintf(buf, "%lld",
4725 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4726}
4727static DEVICE_ATTR_RO(read_ns);
4728
4729/**
4730 * write_cnt_show - write count - number of user calls
4731 * to write(2) that have written data to tape.
4732 * @dev: struct device
4733 * @attr: attribute structure
4734 * @buf: buffer to return formatted data in
4735 */
4736static ssize_t write_cnt_show(struct device *dev,
4737 struct device_attribute *attr, char *buf)
4738{
4739 struct st_modedef *STm = dev_get_drvdata(dev);
4740
4741 return sprintf(buf, "%lld",
4742 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4743}
4744static DEVICE_ATTR_RO(write_cnt);
4745
4746/**
4747 * write_byte_cnt_show - write byte count - raw count of
4748 * bytes written to tape.
4749 * @dev: struct device
4750 * @attr: attribute structure
4751 * @buf: buffer to return formatted data in
4752 */
4753static ssize_t write_byte_cnt_show(struct device *dev,
4754 struct device_attribute *attr, char *buf)
4755{
4756 struct st_modedef *STm = dev_get_drvdata(dev);
4757
4758 return sprintf(buf, "%lld",
4759 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4760}
4761static DEVICE_ATTR_RO(write_byte_cnt);
4762
4763/**
4764 * write_ns_show - write ns - number of nanoseconds waiting on write
4765 * requests to complete.
4766 * @dev: struct device
4767 * @attr: attribute structure
4768 * @buf: buffer to return formatted data in
4769 */
4770static ssize_t write_ns_show(struct device *dev,
4771 struct device_attribute *attr, char *buf)
4772{
4773 struct st_modedef *STm = dev_get_drvdata(dev);
4774
4775 return sprintf(buf, "%lld",
4776 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4777}
4778static DEVICE_ATTR_RO(write_ns);
4779
4780/**
4781 * in_flight_show - number of I/Os currently in flight -
4782 * in most cases this will be either 0 or 1. It may be higher if someone
4783 * has also issued other SCSI commands such as via an ioctl.
4784 * @dev: struct device
4785 * @attr: attribute structure
4786 * @buf: buffer to return formatted data in
4787 */
4788static ssize_t in_flight_show(struct device *dev,
4789 struct device_attribute *attr, char *buf)
4790{
4791 struct st_modedef *STm = dev_get_drvdata(dev);
4792
4793 return sprintf(buf, "%lld",
4794 (long long)atomic64_read(&STm->tape->stats->in_flight));
4795}
4796static DEVICE_ATTR_RO(in_flight);
4797
4798/**
4799 * io_ns_show - io wait ns - this is the number of ns spent
4800 * waiting on all I/O to complete. This includes tape movement commands
4801 * such as rewinding, seeking to end of file or tape, it also includes
4802 * read and write. To determine the time spent on tape movement
4803 * subtract the read and write ns from this value.
4804 * @dev: struct device
4805 * @attr: attribute structure
4806 * @buf: buffer to return formatted data in
4807 */
4808static ssize_t io_ns_show(struct device *dev,
4809 struct device_attribute *attr, char *buf)
4810{
4811 struct st_modedef *STm = dev_get_drvdata(dev);
4812
4813 return sprintf(buf, "%lld",
4814 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4815}
4816static DEVICE_ATTR_RO(io_ns);
4817
4818/**
4819 * other_cnt_show - other io count - this is the number of
4820 * I/O requests other than read and write requests.
4821 * Typically these are tape movement requests but will include driver
4822 * tape movement. This includes only requests issued by the st driver.
4823 * @dev: struct device
4824 * @attr: attribute structure
4825 * @buf: buffer to return formatted data in
4826 */
4827static ssize_t other_cnt_show(struct device *dev,
4828 struct device_attribute *attr, char *buf)
4829{
4830 struct st_modedef *STm = dev_get_drvdata(dev);
4831
4832 return sprintf(buf, "%lld",
4833 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4834}
4835static DEVICE_ATTR_RO(other_cnt);
4836
4837/**
4838 * resid_cnt_show - A count of the number of times we get a residual
4839 * count - this should indicate someone issuing reads larger than the
4840 * block size on tape.
4841 * @dev: struct device
4842 * @attr: attribute structure
4843 * @buf: buffer to return formatted data in
4844 */
4845static ssize_t resid_cnt_show(struct device *dev,
4846 struct device_attribute *attr, char *buf)
4847{
4848 struct st_modedef *STm = dev_get_drvdata(dev);
4849
4850 return sprintf(buf, "%lld",
4851 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4852}
4853static DEVICE_ATTR_RO(resid_cnt);
4854
c69c6be5
GKH		 4855static struct attribute *st_dev_attrs[] = {
4856 &dev_attr_defined.attr,
4857 &dev_attr_default_blksize.attr,
4858 &dev_attr_default_density.attr,
4859 &dev_attr_default_compression.attr,
4860 &dev_attr_options.attr,
4861 NULL,
af23782b 4862};
05545c92
SS		 4863
4864static struct attribute *st_stats_attrs[] = {
4865 &dev_attr_read_cnt.attr,
4866 &dev_attr_read_byte_cnt.attr,
4867 &dev_attr_read_ns.attr,
4868 &dev_attr_write_cnt.attr,
4869 &dev_attr_write_byte_cnt.attr,
4870 &dev_attr_write_ns.attr,
4871 &dev_attr_in_flight.attr,
4872 &dev_attr_io_ns.attr,
4873 &dev_attr_other_cnt.attr,
4874 &dev_attr_resid_cnt.attr,
4875 NULL,
4876};
4877
4878static struct attribute_group stats_group = {
4879 .name = "stats",
4880 .attrs = st_stats_attrs,
4881};
4882
4883static struct attribute_group st_group = {
4884 .attrs = st_dev_attrs,
4885};
4886
4887static const struct attribute_group *st_dev_groups[] = {
4888 &st_group,
4889 &stats_group,
4890 NULL,
4891};
b174be02 4892
1da177e4 4893/* The following functions may be useful for a larger audience. */
6620742f
FT		 4894static int sgl_map_user_pages(struct st_buffer *STbp,
4895 const unsigned int max_pages, unsigned long uaddr,
4896 size_t count, int rw)
1da177e4 4897{
07542b83
JB		 4898 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4899 unsigned long start = uaddr >> PAGE_SHIFT;
4900 const int nr_pages = end - start;
1da177e4 4901 int res, i, j;
1da177e4 4902 struct page **pages;
6620742f 4903 struct rq_map_data *mdata = &STbp->map_data;
1da177e4 4904
1da177e4
LT		 4905 /* User attempted Overflow! */
4906 if ((uaddr + count) < uaddr)
4907 return -EINVAL;
4908
4909 /* Too big */
4910 if (nr_pages > max_pages)
4911 return -ENOMEM;
4912
4913 /* Hmm? */
4914 if (count == 0)
4915 return 0;
4916
4917 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4918 return -ENOMEM;
4919
4920 /* Try to fault in all of the necessary pages */
1da177e4 4921 /* rw==READ means read from drive, write into memory area */
7e339128 4922 res = get_user_pages_unlocked(
1da177e4
LT		 4923 uaddr,
4924 nr_pages,
c164154f
LS		 4925 pages,
4926 rw == READ ? FOLL_WRITE : 0); /* don't force */
1da177e4
LT		 4927
4928 /* Errors and no page mapped should return here */
4929 if (res < nr_pages)
4930 goto out_unmap;
4931
4932 for (i=0; i < nr_pages; i++) {
4933 /* FIXME: flush superflous for rw==READ,
4934 * probably wrong function for rw==WRITE
4935 */
4936 flush_dcache_page(pages[i]);
4937 }
4938
6620742f 4939 mdata->offset = uaddr & ~PAGE_MASK;
6620742f 4940 STbp->mapped_pages = pages;
1da177e4 4941
1da177e4 4942 return nr_pages;
1da177e4
LT		 4943 out_unmap:
4944 if (res > 0) {
4945 for (j=0; j < res; j++)
09cbfeaf 4946 put_page(pages[j]);
6bc733e9 4947 res = 0;
1da177e4
LT		 4948 }
4949 kfree(pages);
4950 return res;
4951}
4952
4953
4954/* And unmap them... */
6620742f
FT		 4955static int sgl_unmap_user_pages(struct st_buffer *STbp,
4956 const unsigned int nr_pages, int dirtied)
1da177e4
LT		 4957{
4958 int i;
4959
4960 for (i=0; i < nr_pages; i++) {
6620742f 4961 struct page *page = STbp->mapped_pages[i];
b5810039 4962
b5810039
NP		 4963 if (dirtied)
4964 SetPageDirty(page);
1da177e4
LT		 4965 /* FIXME: cache flush missing for rw==READ
4966 * FIXME: call the correct reference counting function
4967 */
09cbfeaf 4968 put_page(page);
1da177e4 4969 }
6620742f
FT		 4970 kfree(STbp->mapped_pages);
4971 STbp->mapped_pages = NULL;
1da177e4
LT		 4972
4973 return 0;
4974}
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