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Merge tag 'nfs-for-4.12-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / st.c
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
12 Copyright 1992 - 2016 Kai Makisara
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
20 static const char *verstr = "20160209";
21
22 #include <linux/module.h>
23
24 #include <linux/fs.h>
25 #include <linux/kernel.h>
26 #include <linux/sched/signal.h>
27 #include <linux/mm.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/mtio.h>
33 #include <linux/cdrom.h>
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>
39 #include <linux/cdev.h>
40 #include <linux/idr.h>
41 #include <linux/delay.h>
42 #include <linux/mutex.h>
43
44 #include <linux/uaccess.h>
45 #include <asm/dma.h>
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>
54 #include <scsi/sg.h>
55
56
57 /* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59 #define DEBUG 1
60 #define NO_DEBUG 0
61
62 #define ST_DEB_MSG KERN_NOTICE
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. */
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
79 static int buffer_kbs;
80 static int max_sg_segs;
81 static int try_direct_io = TRY_DIRECT_IO;
82 static int try_rdio = 1;
83 static int try_wdio = 1;
84 static int debug_flag;
85
86 static struct class st_sysfs_class;
87 static const struct attribute_group *st_dev_groups[];
88 static const struct attribute_group *st_drv_groups[];
89
90 MODULE_AUTHOR("Kai Makisara");
91 MODULE_DESCRIPTION("SCSI tape (st) driver");
92 MODULE_LICENSE("GPL");
93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
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 */
100 module_param_named(buffer_kbs, buffer_kbs, int, 0);
101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102 module_param_named(max_sg_segs, max_sg_segs, int, 0);
103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104 module_param_named(try_direct_io, try_direct_io, int, 0);
105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106 module_param_named(debug_flag, debug_flag, int, 0);
107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
109
110 /* Extra parameters for testing */
111 module_param_named(try_rdio, try_rdio, int, 0);
112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113 module_param_named(try_wdio, try_wdio, int, 0);
114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116 #ifndef MODULE
117 static int write_threshold_kbs; /* retained for compatibility */
118 static 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
133 },
134 {
135 "debug_flag", &debug_flag
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 */
146 static const char *st_formats[] = {
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
160 static 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
183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184 static int st_max_sg_segs = ST_MAX_SG;
185
186 static int modes_defined;
187
188 static int enlarge_buffer(struct st_buffer *, int, int);
189 static void clear_buffer(struct st_buffer *);
190 static void normalize_buffer(struct st_buffer *);
191 static int append_to_buffer(const char __user *, struct st_buffer *, int);
192 static int from_buffer(struct st_buffer *, char __user *, int);
193 static void move_buffer_data(struct st_buffer *, int);
194
195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
196 unsigned long, size_t, int);
197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
198
199 static int st_probe(struct device *);
200 static int st_remove(struct device *);
201
202 static struct scsi_driver st_template = {
203 .gendrv = {
204 .name = "st",
205 .owner = THIS_MODULE,
206 .probe = st_probe,
207 .remove = st_remove,
208 .groups = st_drv_groups,
209 },
210 };
211
212 static int st_compression(struct scsi_tape *, int);
213
214 static int find_partition(struct scsi_tape *);
215 static int switch_partition(struct scsi_tape *);
216
217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
219 static void scsi_tape_release(struct kref *);
220
221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
223 static DEFINE_MUTEX(st_ref_mutex);
224 static DEFINE_SPINLOCK(st_index_lock);
225 static DEFINE_SPINLOCK(st_use_lock);
226 static DEFINE_IDR(st_index_idr);
227
228
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
240 static struct scsi_tape *scsi_tape_get(int dev)
241 {
242 struct scsi_tape *STp = NULL;
243
244 mutex_lock(&st_ref_mutex);
245 spin_lock(&st_index_lock);
246
247 STp = idr_find(&st_index_idr, dev);
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
260 out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263 out:
264 spin_unlock(&st_index_lock);
265 mutex_unlock(&st_ref_mutex);
266 return STp;
267 }
268
269 static void scsi_tape_put(struct scsi_tape *STp)
270 {
271 struct scsi_device *sdev = STp->device;
272
273 mutex_lock(&st_ref_mutex);
274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
276 mutex_unlock(&st_ref_mutex);
277 }
278
279 struct 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
286 static 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) */
293 static 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
310 static inline char *tape_name(struct scsi_tape *tape)
311 {
312 return tape->disk->disk_name;
313 }
314
315 #define st_printk(prefix, t, fmt, a...) \
316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
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
323
324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
325 {
326 const u8 *ucp;
327 const u8 *sense = SRpnt->sense;
328
329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
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 */
357 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
358 {
359 int result = SRpnt->result;
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;
369 st_analyze_sense(SRpnt, cmdstatp);
370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
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]);
382 if (cmdstatp->have_sense)
383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
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));
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 &&
397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
399
400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
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)
408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
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
423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
425 #endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
430 DEB(
431 if (debugging) {
432 if (SRpnt->cmd[0] == READ_6)
433 stp = "read";
434 else if (SRpnt->cmd[0] == WRITE_6)
435 stp = "write";
436 else
437 stp = "ioctl";
438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447 }
448
449 static struct st_request *st_allocate_request(struct scsi_tape *stp)
450 {
451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
466 }
467
468 static void st_release_request(struct st_request *streq)
469 {
470 kfree(streq);
471 }
472
473 static void st_do_stats(struct scsi_tape *STp, struct request *req)
474 {
475 ktime_t now;
476
477 now = ktime_get();
478 if (scsi_req(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 (scsi_req(req)->result) {
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 (scsi_req(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 (scsi_req(req)->result) {
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
514 static void st_scsi_execute_end(struct request *req, int uptodate)
515 {
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_request *rq = scsi_req(req);
518 struct scsi_tape *STp = SRpnt->stp;
519 struct bio *tmp;
520
521 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
522 STp->buffer->cmdstat.residual = rq->resid_len;
523
524 st_do_stats(STp, req);
525
526 tmp = SRpnt->bio;
527 if (rq->sense_len)
528 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
529 if (SRpnt->waiting)
530 complete(SRpnt->waiting);
531
532 blk_rq_unmap_user(tmp);
533 __blk_put_request(req->q, req);
534 }
535
536 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
537 int data_direction, void *buffer, unsigned bufflen,
538 int timeout, int retries)
539 {
540 struct request *req;
541 struct scsi_request *rq;
542 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
543 int err = 0;
544 struct scsi_tape *STp = SRpnt->stp;
545
546 req = blk_get_request(SRpnt->stp->device->request_queue,
547 data_direction == DMA_TO_DEVICE ?
548 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, GFP_KERNEL);
549 if (IS_ERR(req))
550 return DRIVER_ERROR << 24;
551 rq = scsi_req(req);
552 scsi_req_init(req);
553 req->rq_flags |= RQF_QUIET;
554
555 mdata->null_mapped = 1;
556
557 if (bufflen) {
558 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
559 GFP_KERNEL);
560 if (err) {
561 blk_put_request(req);
562 return DRIVER_ERROR << 24;
563 }
564 }
565
566 atomic64_inc(&STp->stats->in_flight);
567 if (cmd[0] == WRITE_6) {
568 atomic_set(&STp->stats->last_write_size, bufflen);
569 STp->stats->write_time = ktime_get();
570 } else if (cmd[0] == READ_6) {
571 atomic_set(&STp->stats->last_read_size, bufflen);
572 STp->stats->read_time = ktime_get();
573 } else {
574 STp->stats->other_time = ktime_get();
575 }
576
577 SRpnt->bio = req->bio;
578 rq->cmd_len = COMMAND_SIZE(cmd[0]);
579 memset(rq->cmd, 0, BLK_MAX_CDB);
580 memcpy(rq->cmd, cmd, rq->cmd_len);
581 req->timeout = timeout;
582 rq->retries = retries;
583 req->end_io_data = SRpnt;
584
585 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
586 return 0;
587 }
588
589 /* Do the scsi command. Waits until command performed if do_wait is true.
590 Otherwise write_behind_check() is used to check that the command
591 has finished. */
592 static struct st_request *
593 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
594 int bytes, int direction, int timeout, int retries, int do_wait)
595 {
596 struct completion *waiting;
597 struct rq_map_data *mdata = &STp->buffer->map_data;
598 int ret;
599
600 /* if async, make sure there's no command outstanding */
601 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
602 st_printk(KERN_ERR, STp,
603 "Async command already active.\n");
604 if (signal_pending(current))
605 (STp->buffer)->syscall_result = (-EINTR);
606 else
607 (STp->buffer)->syscall_result = (-EBUSY);
608 return NULL;
609 }
610
611 if (!SRpnt) {
612 SRpnt = st_allocate_request(STp);
613 if (!SRpnt)
614 return NULL;
615 }
616
617 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
618 which IO is outstanding. It's nulled out when the IO completes. */
619 if (!do_wait)
620 (STp->buffer)->last_SRpnt = SRpnt;
621
622 waiting = &STp->wait;
623 init_completion(waiting);
624 SRpnt->waiting = waiting;
625
626 if (STp->buffer->do_dio) {
627 mdata->page_order = 0;
628 mdata->nr_entries = STp->buffer->sg_segs;
629 mdata->pages = STp->buffer->mapped_pages;
630 } else {
631 mdata->page_order = STp->buffer->reserved_page_order;
632 mdata->nr_entries =
633 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
634 mdata->pages = STp->buffer->reserved_pages;
635 mdata->offset = 0;
636 }
637
638 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
639 STp->buffer->cmdstat.have_sense = 0;
640 STp->buffer->syscall_result = 0;
641
642 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
643 retries);
644 if (ret) {
645 /* could not allocate the buffer or request was too large */
646 (STp->buffer)->syscall_result = (-EBUSY);
647 (STp->buffer)->last_SRpnt = NULL;
648 } else if (do_wait) {
649 wait_for_completion(waiting);
650 SRpnt->waiting = NULL;
651 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
652 }
653
654 return SRpnt;
655 }
656
657
658 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
659 write has been correct but EOM early warning reached, -EIO if write ended in
660 error or zero if write successful. Asynchronous writes are used only in
661 variable block mode. */
662 static int write_behind_check(struct scsi_tape * STp)
663 {
664 int retval = 0;
665 struct st_buffer *STbuffer;
666 struct st_partstat *STps;
667 struct st_cmdstatus *cmdstatp;
668 struct st_request *SRpnt;
669
670 STbuffer = STp->buffer;
671 if (!STbuffer->writing)
672 return 0;
673
674 DEB(
675 if (STp->write_pending)
676 STp->nbr_waits++;
677 else
678 STp->nbr_finished++;
679 ) /* end DEB */
680
681 wait_for_completion(&(STp->wait));
682 SRpnt = STbuffer->last_SRpnt;
683 STbuffer->last_SRpnt = NULL;
684 SRpnt->waiting = NULL;
685
686 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
687 st_release_request(SRpnt);
688
689 STbuffer->buffer_bytes -= STbuffer->writing;
690 STps = &(STp->ps[STp->partition]);
691 if (STps->drv_block >= 0) {
692 if (STp->block_size == 0)
693 STps->drv_block++;
694 else
695 STps->drv_block += STbuffer->writing / STp->block_size;
696 }
697
698 cmdstatp = &STbuffer->cmdstat;
699 if (STbuffer->syscall_result) {
700 retval = -EIO;
701 if (cmdstatp->have_sense && !cmdstatp->deferred &&
702 (cmdstatp->flags & SENSE_EOM) &&
703 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
704 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
705 /* EOM at write-behind, has all data been written? */
706 if (!cmdstatp->remainder_valid ||
707 cmdstatp->uremainder64 == 0)
708 retval = -ENOSPC;
709 }
710 if (retval == -EIO)
711 STps->drv_block = -1;
712 }
713 STbuffer->writing = 0;
714
715 DEB(if (debugging && retval)
716 st_printk(ST_DEB_MSG, STp,
717 "Async write error %x, return value %d.\n",
718 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
719
720 return retval;
721 }
722
723
724 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
725 it messes up the block number). */
726 static int cross_eof(struct scsi_tape * STp, int forward)
727 {
728 struct st_request *SRpnt;
729 unsigned char cmd[MAX_COMMAND_SIZE];
730
731 cmd[0] = SPACE;
732 cmd[1] = 0x01; /* Space FileMarks */
733 if (forward) {
734 cmd[2] = cmd[3] = 0;
735 cmd[4] = 1;
736 } else
737 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
738 cmd[5] = 0;
739
740 DEBC_printk(STp, "Stepping over filemark %s.\n",
741 forward ? "forward" : "backward");
742
743 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
744 STp->device->request_queue->rq_timeout,
745 MAX_RETRIES, 1);
746 if (!SRpnt)
747 return (STp->buffer)->syscall_result;
748
749 st_release_request(SRpnt);
750 SRpnt = NULL;
751
752 if ((STp->buffer)->cmdstat.midlevel_result != 0)
753 st_printk(KERN_ERR, STp,
754 "Stepping over filemark %s failed.\n",
755 forward ? "forward" : "backward");
756
757 return (STp->buffer)->syscall_result;
758 }
759
760
761 /* Flush the write buffer (never need to write if variable blocksize). */
762 static int st_flush_write_buffer(struct scsi_tape * STp)
763 {
764 int transfer, blks;
765 int result;
766 unsigned char cmd[MAX_COMMAND_SIZE];
767 struct st_request *SRpnt;
768 struct st_partstat *STps;
769
770 result = write_behind_check(STp);
771 if (result)
772 return result;
773
774 result = 0;
775 if (STp->dirty == 1) {
776
777 transfer = STp->buffer->buffer_bytes;
778 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
779
780 memset(cmd, 0, MAX_COMMAND_SIZE);
781 cmd[0] = WRITE_6;
782 cmd[1] = 1;
783 blks = transfer / STp->block_size;
784 cmd[2] = blks >> 16;
785 cmd[3] = blks >> 8;
786 cmd[4] = blks;
787
788 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
789 STp->device->request_queue->rq_timeout,
790 MAX_WRITE_RETRIES, 1);
791 if (!SRpnt)
792 return (STp->buffer)->syscall_result;
793
794 STps = &(STp->ps[STp->partition]);
795 if ((STp->buffer)->syscall_result != 0) {
796 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
797
798 if (cmdstatp->have_sense && !cmdstatp->deferred &&
799 (cmdstatp->flags & SENSE_EOM) &&
800 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
801 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
802 (!cmdstatp->remainder_valid ||
803 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
804 STp->dirty = 0;
805 (STp->buffer)->buffer_bytes = 0;
806 if (STps->drv_block >= 0)
807 STps->drv_block += blks;
808 result = (-ENOSPC);
809 } else {
810 st_printk(KERN_ERR, STp, "Error on flush.\n");
811 STps->drv_block = (-1);
812 result = (-EIO);
813 }
814 } else {
815 if (STps->drv_block >= 0)
816 STps->drv_block += blks;
817 STp->dirty = 0;
818 (STp->buffer)->buffer_bytes = 0;
819 }
820 st_release_request(SRpnt);
821 SRpnt = NULL;
822 }
823 return result;
824 }
825
826
827 /* Flush the tape buffer. The tape will be positioned correctly unless
828 seek_next is true. */
829 static int flush_buffer(struct scsi_tape *STp, int seek_next)
830 {
831 int backspace, result;
832 struct st_buffer *STbuffer;
833 struct st_partstat *STps;
834
835 STbuffer = STp->buffer;
836
837 /*
838 * If there was a bus reset, block further access
839 * to this device.
840 */
841 if (STp->pos_unknown)
842 return (-EIO);
843
844 if (STp->ready != ST_READY)
845 return 0;
846 STps = &(STp->ps[STp->partition]);
847 if (STps->rw == ST_WRITING) /* Writing */
848 return st_flush_write_buffer(STp);
849
850 if (STp->block_size == 0)
851 return 0;
852
853 backspace = ((STp->buffer)->buffer_bytes +
854 (STp->buffer)->read_pointer) / STp->block_size -
855 ((STp->buffer)->read_pointer + STp->block_size - 1) /
856 STp->block_size;
857 (STp->buffer)->buffer_bytes = 0;
858 (STp->buffer)->read_pointer = 0;
859 result = 0;
860 if (!seek_next) {
861 if (STps->eof == ST_FM_HIT) {
862 result = cross_eof(STp, 0); /* Back over the EOF hit */
863 if (!result)
864 STps->eof = ST_NOEOF;
865 else {
866 if (STps->drv_file >= 0)
867 STps->drv_file++;
868 STps->drv_block = 0;
869 }
870 }
871 if (!result && backspace > 0)
872 result = st_int_ioctl(STp, MTBSR, backspace);
873 } else if (STps->eof == ST_FM_HIT) {
874 if (STps->drv_file >= 0)
875 STps->drv_file++;
876 STps->drv_block = 0;
877 STps->eof = ST_NOEOF;
878 }
879 return result;
880
881 }
882 \f
883 /* Set the mode parameters */
884 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
885 {
886 int set_it = 0;
887 unsigned long arg;
888
889 if (!STp->density_changed &&
890 STm->default_density >= 0 &&
891 STm->default_density != STp->density) {
892 arg = STm->default_density;
893 set_it = 1;
894 } else
895 arg = STp->density;
896 arg <<= MT_ST_DENSITY_SHIFT;
897 if (!STp->blksize_changed &&
898 STm->default_blksize >= 0 &&
899 STm->default_blksize != STp->block_size) {
900 arg |= STm->default_blksize;
901 set_it = 1;
902 } else
903 arg |= STp->block_size;
904 if (set_it &&
905 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
906 st_printk(KERN_WARNING, STp,
907 "Can't set default block size to %d bytes "
908 "and density %x.\n",
909 STm->default_blksize, STm->default_density);
910 if (modes_defined)
911 return (-EINVAL);
912 }
913 return 0;
914 }
915
916
917 /* Lock or unlock the drive door. Don't use when st_request allocated. */
918 static int do_door_lock(struct scsi_tape * STp, int do_lock)
919 {
920 int retval;
921
922 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
923
924 retval = scsi_set_medium_removal(STp->device,
925 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
926 if (!retval)
927 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
928 else
929 STp->door_locked = ST_LOCK_FAILS;
930 return retval;
931 }
932
933
934 /* Set the internal state after reset */
935 static void reset_state(struct scsi_tape *STp)
936 {
937 int i;
938 struct st_partstat *STps;
939
940 STp->pos_unknown = 0;
941 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
942 STps = &(STp->ps[i]);
943 STps->rw = ST_IDLE;
944 STps->eof = ST_NOEOF;
945 STps->at_sm = 0;
946 STps->last_block_valid = 0;
947 STps->drv_block = -1;
948 STps->drv_file = -1;
949 }
950 if (STp->can_partitions) {
951 STp->partition = find_partition(STp);
952 if (STp->partition < 0)
953 STp->partition = 0;
954 STp->new_partition = STp->partition;
955 }
956 }
957 \f
958 /* Test if the drive is ready. Returns either one of the codes below or a negative system
959 error code. */
960 #define CHKRES_READY 0
961 #define CHKRES_NEW_SESSION 1
962 #define CHKRES_NOT_READY 2
963 #define CHKRES_NO_TAPE 3
964
965 #define MAX_ATTENTIONS 10
966
967 static int test_ready(struct scsi_tape *STp, int do_wait)
968 {
969 int attentions, waits, max_wait, scode;
970 int retval = CHKRES_READY, new_session = 0;
971 unsigned char cmd[MAX_COMMAND_SIZE];
972 struct st_request *SRpnt = NULL;
973 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
974
975 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
976
977 for (attentions=waits=0; ; ) {
978 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
979 cmd[0] = TEST_UNIT_READY;
980 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
981 STp->long_timeout, MAX_READY_RETRIES, 1);
982
983 if (!SRpnt) {
984 retval = (STp->buffer)->syscall_result;
985 break;
986 }
987
988 if (cmdstatp->have_sense) {
989
990 scode = cmdstatp->sense_hdr.sense_key;
991
992 if (scode == UNIT_ATTENTION) { /* New media? */
993 new_session = 1;
994 if (attentions < MAX_ATTENTIONS) {
995 attentions++;
996 continue;
997 }
998 else {
999 retval = (-EIO);
1000 break;
1001 }
1002 }
1003
1004 if (scode == NOT_READY) {
1005 if (waits < max_wait) {
1006 if (msleep_interruptible(1000)) {
1007 retval = (-EINTR);
1008 break;
1009 }
1010 waits++;
1011 continue;
1012 }
1013 else {
1014 if ((STp->device)->scsi_level >= SCSI_2 &&
1015 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1016 retval = CHKRES_NO_TAPE;
1017 else
1018 retval = CHKRES_NOT_READY;
1019 break;
1020 }
1021 }
1022 }
1023
1024 retval = (STp->buffer)->syscall_result;
1025 if (!retval)
1026 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1027 break;
1028 }
1029
1030 if (SRpnt != NULL)
1031 st_release_request(SRpnt);
1032 return retval;
1033 }
1034
1035
1036 /* See if the drive is ready and gather information about the tape. Return values:
1037 < 0 negative error code from errno.h
1038 0 drive ready
1039 1 drive not ready (possibly no tape)
1040 */
1041 static int check_tape(struct scsi_tape *STp, struct file *filp)
1042 {
1043 int i, retval, new_session = 0, do_wait;
1044 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1045 unsigned short st_flags = filp->f_flags;
1046 struct st_request *SRpnt = NULL;
1047 struct st_modedef *STm;
1048 struct st_partstat *STps;
1049 struct inode *inode = file_inode(filp);
1050 int mode = TAPE_MODE(inode);
1051
1052 STp->ready = ST_READY;
1053
1054 if (mode != STp->current_mode) {
1055 DEBC_printk(STp, "Mode change from %d to %d.\n",
1056 STp->current_mode, mode);
1057 new_session = 1;
1058 STp->current_mode = mode;
1059 }
1060 STm = &(STp->modes[STp->current_mode]);
1061
1062 saved_cleaning = STp->cleaning_req;
1063 STp->cleaning_req = 0;
1064
1065 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1066 retval = test_ready(STp, do_wait);
1067
1068 if (retval < 0)
1069 goto err_out;
1070
1071 if (retval == CHKRES_NEW_SESSION) {
1072 STp->pos_unknown = 0;
1073 STp->partition = STp->new_partition = 0;
1074 if (STp->can_partitions)
1075 STp->nbr_partitions = 1; /* This guess will be updated later
1076 if necessary */
1077 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1078 STps = &(STp->ps[i]);
1079 STps->rw = ST_IDLE;
1080 STps->eof = ST_NOEOF;
1081 STps->at_sm = 0;
1082 STps->last_block_valid = 0;
1083 STps->drv_block = 0;
1084 STps->drv_file = 0;
1085 }
1086 new_session = 1;
1087 }
1088 else {
1089 STp->cleaning_req |= saved_cleaning;
1090
1091 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1092 if (retval == CHKRES_NO_TAPE)
1093 STp->ready = ST_NO_TAPE;
1094 else
1095 STp->ready = ST_NOT_READY;
1096
1097 STp->density = 0; /* Clear the erroneous "residue" */
1098 STp->write_prot = 0;
1099 STp->block_size = 0;
1100 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1101 STp->partition = STp->new_partition = 0;
1102 STp->door_locked = ST_UNLOCKED;
1103 return CHKRES_NOT_READY;
1104 }
1105 }
1106
1107 if (STp->omit_blklims)
1108 STp->min_block = STp->max_block = (-1);
1109 else {
1110 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1111 cmd[0] = READ_BLOCK_LIMITS;
1112
1113 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1114 STp->device->request_queue->rq_timeout,
1115 MAX_READY_RETRIES, 1);
1116 if (!SRpnt) {
1117 retval = (STp->buffer)->syscall_result;
1118 goto err_out;
1119 }
1120
1121 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1122 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1123 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1124 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1125 (STp->buffer)->b_data[5];
1126 if ( DEB( debugging || ) !STp->inited)
1127 st_printk(KERN_INFO, STp,
1128 "Block limits %d - %d bytes.\n",
1129 STp->min_block, STp->max_block);
1130 } else {
1131 STp->min_block = STp->max_block = (-1);
1132 DEBC_printk(STp, "Can't read block limits.\n");
1133 }
1134 }
1135
1136 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1137 cmd[0] = MODE_SENSE;
1138 cmd[4] = 12;
1139
1140 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1141 STp->device->request_queue->rq_timeout,
1142 MAX_READY_RETRIES, 1);
1143 if (!SRpnt) {
1144 retval = (STp->buffer)->syscall_result;
1145 goto err_out;
1146 }
1147
1148 if ((STp->buffer)->syscall_result != 0) {
1149 DEBC_printk(STp, "No Mode Sense.\n");
1150 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1151 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1152 STp->drv_write_prot = 0;
1153 } else {
1154 DEBC_printk(STp,"Mode sense. Length %d, "
1155 "medium %x, WBS %x, BLL %d\n",
1156 (STp->buffer)->b_data[0],
1157 (STp->buffer)->b_data[1],
1158 (STp->buffer)->b_data[2],
1159 (STp->buffer)->b_data[3]);
1160
1161 if ((STp->buffer)->b_data[3] >= 8) {
1162 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1163 STp->density = (STp->buffer)->b_data[4];
1164 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1165 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1166 DEBC_printk(STp, "Density %x, tape length: %x, "
1167 "drv buffer: %d\n",
1168 STp->density,
1169 (STp->buffer)->b_data[5] * 65536 +
1170 (STp->buffer)->b_data[6] * 256 +
1171 (STp->buffer)->b_data[7],
1172 STp->drv_buffer);
1173 }
1174 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1175 if (!STp->drv_buffer && STp->immediate_filemark) {
1176 st_printk(KERN_WARNING, STp,
1177 "non-buffered tape: disabling "
1178 "writing immediate filemarks\n");
1179 STp->immediate_filemark = 0;
1180 }
1181 }
1182 st_release_request(SRpnt);
1183 SRpnt = NULL;
1184 STp->inited = 1;
1185
1186 if (STp->block_size > 0)
1187 (STp->buffer)->buffer_blocks =
1188 (STp->buffer)->buffer_size / STp->block_size;
1189 else
1190 (STp->buffer)->buffer_blocks = 1;
1191 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1192
1193 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1194 STp->block_size, (STp->buffer)->buffer_size,
1195 (STp->buffer)->buffer_blocks);
1196
1197 if (STp->drv_write_prot) {
1198 STp->write_prot = 1;
1199
1200 DEBC_printk(STp, "Write protected\n");
1201
1202 if (do_wait &&
1203 ((st_flags & O_ACCMODE) == O_WRONLY ||
1204 (st_flags & O_ACCMODE) == O_RDWR)) {
1205 retval = (-EROFS);
1206 goto err_out;
1207 }
1208 }
1209
1210 if (STp->can_partitions && STp->nbr_partitions < 1) {
1211 /* This code is reached when the device is opened for the first time
1212 after the driver has been initialized with tape in the drive and the
1213 partition support has been enabled. */
1214 DEBC_printk(STp, "Updating partition number in status.\n");
1215 if ((STp->partition = find_partition(STp)) < 0) {
1216 retval = STp->partition;
1217 goto err_out;
1218 }
1219 STp->new_partition = STp->partition;
1220 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1221 }
1222
1223 if (new_session) { /* Change the drive parameters for the new mode */
1224 STp->density_changed = STp->blksize_changed = 0;
1225 STp->compression_changed = 0;
1226 if (!(STm->defaults_for_writes) &&
1227 (retval = set_mode_densblk(STp, STm)) < 0)
1228 goto err_out;
1229
1230 if (STp->default_drvbuffer != 0xff) {
1231 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1232 st_printk(KERN_WARNING, STp,
1233 "Can't set default drive "
1234 "buffering to %d.\n",
1235 STp->default_drvbuffer);
1236 }
1237 }
1238
1239 return CHKRES_READY;
1240
1241 err_out:
1242 return retval;
1243 }
1244
1245
1246 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1247 module count. */
1248 static int st_open(struct inode *inode, struct file *filp)
1249 {
1250 int i, retval = (-EIO);
1251 int resumed = 0;
1252 struct scsi_tape *STp;
1253 struct st_partstat *STps;
1254 int dev = TAPE_NR(inode);
1255
1256 /*
1257 * We really want to do nonseekable_open(inode, filp); here, but some
1258 * versions of tar incorrectly call lseek on tapes and bail out if that
1259 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1260 */
1261 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1262
1263 if (!(STp = scsi_tape_get(dev))) {
1264 return -ENXIO;
1265 }
1266
1267 filp->private_data = STp;
1268
1269 spin_lock(&st_use_lock);
1270 if (STp->in_use) {
1271 spin_unlock(&st_use_lock);
1272 scsi_tape_put(STp);
1273 DEBC_printk(STp, "Device already in use.\n");
1274 return (-EBUSY);
1275 }
1276
1277 STp->in_use = 1;
1278 spin_unlock(&st_use_lock);
1279 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1280
1281 if (scsi_autopm_get_device(STp->device) < 0) {
1282 retval = -EIO;
1283 goto err_out;
1284 }
1285 resumed = 1;
1286 if (!scsi_block_when_processing_errors(STp->device)) {
1287 retval = (-ENXIO);
1288 goto err_out;
1289 }
1290
1291 /* See that we have at least a one page buffer available */
1292 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1293 st_printk(KERN_WARNING, STp,
1294 "Can't allocate one page tape buffer.\n");
1295 retval = (-EOVERFLOW);
1296 goto err_out;
1297 }
1298
1299 (STp->buffer)->cleared = 0;
1300 (STp->buffer)->writing = 0;
1301 (STp->buffer)->syscall_result = 0;
1302
1303 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1304
1305 STp->dirty = 0;
1306 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1307 STps = &(STp->ps[i]);
1308 STps->rw = ST_IDLE;
1309 }
1310 STp->try_dio_now = STp->try_dio;
1311 STp->recover_count = 0;
1312 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1313 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1314
1315 retval = check_tape(STp, filp);
1316 if (retval < 0)
1317 goto err_out;
1318 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1319 retval != CHKRES_READY) {
1320 if (STp->ready == NO_TAPE)
1321 retval = (-ENOMEDIUM);
1322 else
1323 retval = (-EIO);
1324 goto err_out;
1325 }
1326 return 0;
1327
1328 err_out:
1329 normalize_buffer(STp->buffer);
1330 spin_lock(&st_use_lock);
1331 STp->in_use = 0;
1332 spin_unlock(&st_use_lock);
1333 if (resumed)
1334 scsi_autopm_put_device(STp->device);
1335 scsi_tape_put(STp);
1336 return retval;
1337
1338 }
1339 \f
1340
1341 /* Flush the tape buffer before close */
1342 static int st_flush(struct file *filp, fl_owner_t id)
1343 {
1344 int result = 0, result2;
1345 unsigned char cmd[MAX_COMMAND_SIZE];
1346 struct st_request *SRpnt;
1347 struct scsi_tape *STp = filp->private_data;
1348 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1349 struct st_partstat *STps = &(STp->ps[STp->partition]);
1350
1351 if (file_count(filp) > 1)
1352 return 0;
1353
1354 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1355 result = st_flush_write_buffer(STp);
1356 if (result != 0 && result != (-ENOSPC))
1357 goto out;
1358 }
1359
1360 if (STp->can_partitions &&
1361 (result2 = switch_partition(STp)) < 0) {
1362 DEBC_printk(STp, "switch_partition at close failed.\n");
1363 if (result == 0)
1364 result = result2;
1365 goto out;
1366 }
1367
1368 DEBC( if (STp->nbr_requests)
1369 st_printk(KERN_DEBUG, STp,
1370 "Number of r/w requests %d, dio used in %d, "
1371 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1372 STp->nbr_pages));
1373
1374 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1375 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1376
1377 #if DEBUG
1378 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1379 STp->nbr_waits, STp->nbr_finished);
1380 #endif
1381 memset(cmd, 0, MAX_COMMAND_SIZE);
1382 cmd[0] = WRITE_FILEMARKS;
1383 if (STp->immediate_filemark)
1384 cmd[1] = 1;
1385 cmd[4] = 1 + STp->two_fm;
1386
1387 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1388 STp->device->request_queue->rq_timeout,
1389 MAX_WRITE_RETRIES, 1);
1390 if (!SRpnt) {
1391 result = (STp->buffer)->syscall_result;
1392 goto out;
1393 }
1394
1395 if (STp->buffer->syscall_result == 0 ||
1396 (cmdstatp->have_sense && !cmdstatp->deferred &&
1397 (cmdstatp->flags & SENSE_EOM) &&
1398 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1399 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1400 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1401 /* Write successful at EOM */
1402 st_release_request(SRpnt);
1403 SRpnt = NULL;
1404 if (STps->drv_file >= 0)
1405 STps->drv_file++;
1406 STps->drv_block = 0;
1407 if (STp->two_fm)
1408 cross_eof(STp, 0);
1409 STps->eof = ST_FM;
1410 }
1411 else { /* Write error */
1412 st_release_request(SRpnt);
1413 SRpnt = NULL;
1414 st_printk(KERN_ERR, STp,
1415 "Error on write filemark.\n");
1416 if (result == 0)
1417 result = (-EIO);
1418 }
1419
1420 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1421 } else if (!STp->rew_at_close) {
1422 STps = &(STp->ps[STp->partition]);
1423 if (!STm->sysv || STps->rw != ST_READING) {
1424 if (STp->can_bsr)
1425 result = flush_buffer(STp, 0);
1426 else if (STps->eof == ST_FM_HIT) {
1427 result = cross_eof(STp, 0);
1428 if (result) {
1429 if (STps->drv_file >= 0)
1430 STps->drv_file++;
1431 STps->drv_block = 0;
1432 STps->eof = ST_FM;
1433 } else
1434 STps->eof = ST_NOEOF;
1435 }
1436 } else if ((STps->eof == ST_NOEOF &&
1437 !(result = cross_eof(STp, 1))) ||
1438 STps->eof == ST_FM_HIT) {
1439 if (STps->drv_file >= 0)
1440 STps->drv_file++;
1441 STps->drv_block = 0;
1442 STps->eof = ST_FM;
1443 }
1444 }
1445
1446 out:
1447 if (STp->rew_at_close) {
1448 result2 = st_int_ioctl(STp, MTREW, 1);
1449 if (result == 0)
1450 result = result2;
1451 }
1452 return result;
1453 }
1454
1455
1456 /* Close the device and release it. BKL is not needed: this is the only thread
1457 accessing this tape. */
1458 static int st_release(struct inode *inode, struct file *filp)
1459 {
1460 int result = 0;
1461 struct scsi_tape *STp = filp->private_data;
1462
1463 if (STp->door_locked == ST_LOCKED_AUTO)
1464 do_door_lock(STp, 0);
1465
1466 normalize_buffer(STp->buffer);
1467 spin_lock(&st_use_lock);
1468 STp->in_use = 0;
1469 spin_unlock(&st_use_lock);
1470 scsi_autopm_put_device(STp->device);
1471 scsi_tape_put(STp);
1472
1473 return result;
1474 }
1475 \f
1476 /* The checks common to both reading and writing */
1477 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1478 {
1479 ssize_t retval = 0;
1480
1481 /*
1482 * If we are in the middle of error recovery, don't let anyone
1483 * else try and use this device. Also, if error recovery fails, it
1484 * may try and take the device offline, in which case all further
1485 * access to the device is prohibited.
1486 */
1487 if (!scsi_block_when_processing_errors(STp->device)) {
1488 retval = (-ENXIO);
1489 goto out;
1490 }
1491
1492 if (STp->ready != ST_READY) {
1493 if (STp->ready == ST_NO_TAPE)
1494 retval = (-ENOMEDIUM);
1495 else
1496 retval = (-EIO);
1497 goto out;
1498 }
1499
1500 if (! STp->modes[STp->current_mode].defined) {
1501 retval = (-ENXIO);
1502 goto out;
1503 }
1504
1505
1506 /*
1507 * If there was a bus reset, block further access
1508 * to this device.
1509 */
1510 if (STp->pos_unknown) {
1511 retval = (-EIO);
1512 goto out;
1513 }
1514
1515 if (count == 0)
1516 goto out;
1517
1518 DEB(
1519 if (!STp->in_use) {
1520 st_printk(ST_DEB_MSG, STp,
1521 "Incorrect device.\n");
1522 retval = (-EIO);
1523 goto out;
1524 } ) /* end DEB */
1525
1526 if (STp->can_partitions &&
1527 (retval = switch_partition(STp)) < 0)
1528 goto out;
1529
1530 if (STp->block_size == 0 && STp->max_block > 0 &&
1531 (count < STp->min_block || count > STp->max_block)) {
1532 retval = (-EINVAL);
1533 goto out;
1534 }
1535
1536 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1537 !do_door_lock(STp, 1))
1538 STp->door_locked = ST_LOCKED_AUTO;
1539
1540 out:
1541 return retval;
1542 }
1543
1544
1545 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1546 size_t count, int is_read)
1547 {
1548 int i, bufsize, retval = 0;
1549 struct st_buffer *STbp = STp->buffer;
1550
1551 if (is_read)
1552 i = STp->try_dio_now && try_rdio;
1553 else
1554 i = STp->try_dio_now && try_wdio;
1555
1556 if (i && ((unsigned long)buf & queue_dma_alignment(
1557 STp->device->request_queue)) == 0) {
1558 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1559 count, (is_read ? READ : WRITE));
1560 if (i > 0) {
1561 STbp->do_dio = i;
1562 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1563 }
1564 else
1565 STbp->do_dio = 0; /* fall back to buffering with any error */
1566 STbp->sg_segs = STbp->do_dio;
1567 DEB(
1568 if (STbp->do_dio) {
1569 STp->nbr_dio++;
1570 STp->nbr_pages += STbp->do_dio;
1571 }
1572 )
1573 } else
1574 STbp->do_dio = 0;
1575 DEB( STp->nbr_requests++; )
1576
1577 if (!STbp->do_dio) {
1578 if (STp->block_size)
1579 bufsize = STp->block_size > st_fixed_buffer_size ?
1580 STp->block_size : st_fixed_buffer_size;
1581 else {
1582 bufsize = count;
1583 /* Make sure that data from previous user is not leaked even if
1584 HBA does not return correct residual */
1585 if (is_read && STp->sili && !STbp->cleared)
1586 clear_buffer(STbp);
1587 }
1588
1589 if (bufsize > STbp->buffer_size &&
1590 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1591 st_printk(KERN_WARNING, STp,
1592 "Can't allocate %d byte tape buffer.\n",
1593 bufsize);
1594 retval = (-EOVERFLOW);
1595 goto out;
1596 }
1597 if (STp->block_size)
1598 STbp->buffer_blocks = bufsize / STp->block_size;
1599 }
1600
1601 out:
1602 return retval;
1603 }
1604
1605
1606 /* Can be called more than once after each setup_buffer() */
1607 static void release_buffering(struct scsi_tape *STp, int is_read)
1608 {
1609 struct st_buffer *STbp;
1610
1611 STbp = STp->buffer;
1612 if (STbp->do_dio) {
1613 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1614 STbp->do_dio = 0;
1615 STbp->sg_segs = 0;
1616 }
1617 }
1618
1619
1620 /* Write command */
1621 static ssize_t
1622 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1623 {
1624 ssize_t total;
1625 ssize_t i, do_count, blks, transfer;
1626 ssize_t retval;
1627 int undone, retry_eot = 0, scode;
1628 int async_write;
1629 unsigned char cmd[MAX_COMMAND_SIZE];
1630 const char __user *b_point;
1631 struct st_request *SRpnt = NULL;
1632 struct scsi_tape *STp = filp->private_data;
1633 struct st_modedef *STm;
1634 struct st_partstat *STps;
1635 struct st_buffer *STbp;
1636
1637 if (mutex_lock_interruptible(&STp->lock))
1638 return -ERESTARTSYS;
1639
1640 retval = rw_checks(STp, filp, count);
1641 if (retval || count == 0)
1642 goto out;
1643
1644 /* Write must be integral number of blocks */
1645 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1646 st_printk(KERN_WARNING, STp,
1647 "Write not multiple of tape block size.\n");
1648 retval = (-EINVAL);
1649 goto out;
1650 }
1651
1652 STm = &(STp->modes[STp->current_mode]);
1653 STps = &(STp->ps[STp->partition]);
1654
1655 if (STp->write_prot) {
1656 retval = (-EACCES);
1657 goto out;
1658 }
1659
1660
1661 if (STps->rw == ST_READING) {
1662 retval = flush_buffer(STp, 0);
1663 if (retval)
1664 goto out;
1665 STps->rw = ST_WRITING;
1666 } else if (STps->rw != ST_WRITING &&
1667 STps->drv_file == 0 && STps->drv_block == 0) {
1668 if ((retval = set_mode_densblk(STp, STm)) < 0)
1669 goto out;
1670 if (STm->default_compression != ST_DONT_TOUCH &&
1671 !(STp->compression_changed)) {
1672 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1673 st_printk(KERN_WARNING, STp,
1674 "Can't set default compression.\n");
1675 if (modes_defined) {
1676 retval = (-EINVAL);
1677 goto out;
1678 }
1679 }
1680 }
1681 }
1682
1683 STbp = STp->buffer;
1684 i = write_behind_check(STp);
1685 if (i) {
1686 if (i == -ENOSPC)
1687 STps->eof = ST_EOM_OK;
1688 else
1689 STps->eof = ST_EOM_ERROR;
1690 }
1691
1692 if (STps->eof == ST_EOM_OK) {
1693 STps->eof = ST_EOD_1; /* allow next write */
1694 retval = (-ENOSPC);
1695 goto out;
1696 }
1697 else if (STps->eof == ST_EOM_ERROR) {
1698 retval = (-EIO);
1699 goto out;
1700 }
1701
1702 /* Check the buffer readability in cases where copy_user might catch
1703 the problems after some tape movement. */
1704 if (STp->block_size != 0 &&
1705 !STbp->do_dio &&
1706 (copy_from_user(&i, buf, 1) != 0 ||
1707 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1708 retval = (-EFAULT);
1709 goto out;
1710 }
1711
1712 retval = setup_buffering(STp, buf, count, 0);
1713 if (retval)
1714 goto out;
1715
1716 total = count;
1717
1718 memset(cmd, 0, MAX_COMMAND_SIZE);
1719 cmd[0] = WRITE_6;
1720 cmd[1] = (STp->block_size != 0);
1721
1722 STps->rw = ST_WRITING;
1723
1724 b_point = buf;
1725 while (count > 0 && !retry_eot) {
1726
1727 if (STbp->do_dio) {
1728 do_count = count;
1729 }
1730 else {
1731 if (STp->block_size == 0)
1732 do_count = count;
1733 else {
1734 do_count = STbp->buffer_blocks * STp->block_size -
1735 STbp->buffer_bytes;
1736 if (do_count > count)
1737 do_count = count;
1738 }
1739
1740 i = append_to_buffer(b_point, STbp, do_count);
1741 if (i) {
1742 retval = i;
1743 goto out;
1744 }
1745 }
1746 count -= do_count;
1747 b_point += do_count;
1748
1749 async_write = STp->block_size == 0 && !STbp->do_dio &&
1750 STm->do_async_writes && STps->eof < ST_EOM_OK;
1751
1752 if (STp->block_size != 0 && STm->do_buffer_writes &&
1753 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1754 STbp->buffer_bytes < STbp->buffer_size) {
1755 STp->dirty = 1;
1756 /* Don't write a buffer that is not full enough. */
1757 if (!async_write && count == 0)
1758 break;
1759 }
1760
1761 retry_write:
1762 if (STp->block_size == 0)
1763 blks = transfer = do_count;
1764 else {
1765 if (!STbp->do_dio)
1766 blks = STbp->buffer_bytes;
1767 else
1768 blks = do_count;
1769 blks /= STp->block_size;
1770 transfer = blks * STp->block_size;
1771 }
1772 cmd[2] = blks >> 16;
1773 cmd[3] = blks >> 8;
1774 cmd[4] = blks;
1775
1776 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1777 STp->device->request_queue->rq_timeout,
1778 MAX_WRITE_RETRIES, !async_write);
1779 if (!SRpnt) {
1780 retval = STbp->syscall_result;
1781 goto out;
1782 }
1783 if (async_write && !STbp->syscall_result) {
1784 STbp->writing = transfer;
1785 STp->dirty = !(STbp->writing ==
1786 STbp->buffer_bytes);
1787 SRpnt = NULL; /* Prevent releasing this request! */
1788 DEB( STp->write_pending = 1; )
1789 break;
1790 }
1791
1792 if (STbp->syscall_result != 0) {
1793 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1794
1795 DEBC_printk(STp, "Error on write:\n");
1796 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1797 scode = cmdstatp->sense_hdr.sense_key;
1798 if (cmdstatp->remainder_valid)
1799 undone = (int)cmdstatp->uremainder64;
1800 else if (STp->block_size == 0 &&
1801 scode == VOLUME_OVERFLOW)
1802 undone = transfer;
1803 else
1804 undone = 0;
1805 if (STp->block_size != 0)
1806 undone *= STp->block_size;
1807 if (undone <= do_count) {
1808 /* Only data from this write is not written */
1809 count += undone;
1810 b_point -= undone;
1811 do_count -= undone;
1812 if (STp->block_size)
1813 blks = (transfer - undone) / STp->block_size;
1814 STps->eof = ST_EOM_OK;
1815 /* Continue in fixed block mode if all written
1816 in this request but still something left to write
1817 (retval left to zero)
1818 */
1819 if (STp->block_size == 0 ||
1820 undone > 0 || count == 0)
1821 retval = (-ENOSPC); /* EOM within current request */
1822 DEBC_printk(STp, "EOM with %d "
1823 "bytes unwritten.\n",
1824 (int)count);
1825 } else {
1826 /* EOT within data buffered earlier (possible only
1827 in fixed block mode without direct i/o) */
1828 if (!retry_eot && !cmdstatp->deferred &&
1829 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1830 move_buffer_data(STp->buffer, transfer - undone);
1831 retry_eot = 1;
1832 if (STps->drv_block >= 0) {
1833 STps->drv_block += (transfer - undone) /
1834 STp->block_size;
1835 }
1836 STps->eof = ST_EOM_OK;
1837 DEBC_printk(STp, "Retry "
1838 "write of %d "
1839 "bytes at EOM.\n",
1840 STp->buffer->buffer_bytes);
1841 goto retry_write;
1842 }
1843 else {
1844 /* Either error within data buffered by driver or
1845 failed retry */
1846 count -= do_count;
1847 blks = do_count = 0;
1848 STps->eof = ST_EOM_ERROR;
1849 STps->drv_block = (-1); /* Too cautious? */
1850 retval = (-EIO); /* EOM for old data */
1851 DEBC_printk(STp, "EOM with "
1852 "lost data.\n");
1853 }
1854 }
1855 } else {
1856 count += do_count;
1857 STps->drv_block = (-1); /* Too cautious? */
1858 retval = STbp->syscall_result;
1859 }
1860
1861 }
1862
1863 if (STps->drv_block >= 0) {
1864 if (STp->block_size == 0)
1865 STps->drv_block += (do_count > 0);
1866 else
1867 STps->drv_block += blks;
1868 }
1869
1870 STbp->buffer_bytes = 0;
1871 STp->dirty = 0;
1872
1873 if (retval || retry_eot) {
1874 if (count < total)
1875 retval = total - count;
1876 goto out;
1877 }
1878 }
1879
1880 if (STps->eof == ST_EOD_1)
1881 STps->eof = ST_EOM_OK;
1882 else if (STps->eof != ST_EOM_OK)
1883 STps->eof = ST_NOEOF;
1884 retval = total - count;
1885
1886 out:
1887 if (SRpnt != NULL)
1888 st_release_request(SRpnt);
1889 release_buffering(STp, 0);
1890 mutex_unlock(&STp->lock);
1891
1892 return retval;
1893 }
1894 \f
1895 /* Read data from the tape. Returns zero in the normal case, one if the
1896 eof status has changed, and the negative error code in case of a
1897 fatal error. Otherwise updates the buffer and the eof state.
1898
1899 Does release user buffer mapping if it is set.
1900 */
1901 static long read_tape(struct scsi_tape *STp, long count,
1902 struct st_request ** aSRpnt)
1903 {
1904 int transfer, blks, bytes;
1905 unsigned char cmd[MAX_COMMAND_SIZE];
1906 struct st_request *SRpnt;
1907 struct st_modedef *STm;
1908 struct st_partstat *STps;
1909 struct st_buffer *STbp;
1910 int retval = 0;
1911
1912 if (count == 0)
1913 return 0;
1914
1915 STm = &(STp->modes[STp->current_mode]);
1916 STps = &(STp->ps[STp->partition]);
1917 if (STps->eof == ST_FM_HIT)
1918 return 1;
1919 STbp = STp->buffer;
1920
1921 if (STp->block_size == 0)
1922 blks = bytes = count;
1923 else {
1924 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1925 blks = (STp->buffer)->buffer_blocks;
1926 bytes = blks * STp->block_size;
1927 } else {
1928 bytes = count;
1929 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1930 bytes = (STp->buffer)->buffer_size;
1931 blks = bytes / STp->block_size;
1932 bytes = blks * STp->block_size;
1933 }
1934 }
1935
1936 memset(cmd, 0, MAX_COMMAND_SIZE);
1937 cmd[0] = READ_6;
1938 cmd[1] = (STp->block_size != 0);
1939 if (!cmd[1] && STp->sili)
1940 cmd[1] |= 2;
1941 cmd[2] = blks >> 16;
1942 cmd[3] = blks >> 8;
1943 cmd[4] = blks;
1944
1945 SRpnt = *aSRpnt;
1946 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1947 STp->device->request_queue->rq_timeout,
1948 MAX_RETRIES, 1);
1949 release_buffering(STp, 1);
1950 *aSRpnt = SRpnt;
1951 if (!SRpnt)
1952 return STbp->syscall_result;
1953
1954 STbp->read_pointer = 0;
1955 STps->at_sm = 0;
1956
1957 /* Something to check */
1958 if (STbp->syscall_result) {
1959 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1960
1961 retval = 1;
1962 DEBC_printk(STp,
1963 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1964 SRpnt->sense[0], SRpnt->sense[1],
1965 SRpnt->sense[2], SRpnt->sense[3],
1966 SRpnt->sense[4], SRpnt->sense[5],
1967 SRpnt->sense[6], SRpnt->sense[7]);
1968 if (cmdstatp->have_sense) {
1969
1970 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1971 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1972
1973 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1974 /* Compute the residual count */
1975 if (cmdstatp->remainder_valid)
1976 transfer = (int)cmdstatp->uremainder64;
1977 else
1978 transfer = 0;
1979 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1980 if (STp->block_size == 0)
1981 transfer = bytes;
1982 /* Some drives set ILI with MEDIUM ERROR */
1983 cmdstatp->flags &= ~SENSE_ILI;
1984 }
1985
1986 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1987 if (STp->block_size == 0 &&
1988 transfer < 0) {
1989 st_printk(KERN_NOTICE, STp,
1990 "Failed to read %d "
1991 "byte block with %d "
1992 "byte transfer.\n",
1993 bytes - transfer,
1994 bytes);
1995 if (STps->drv_block >= 0)
1996 STps->drv_block += 1;
1997 STbp->buffer_bytes = 0;
1998 return (-ENOMEM);
1999 } else if (STp->block_size == 0) {
2000 STbp->buffer_bytes = bytes - transfer;
2001 } else {
2002 st_release_request(SRpnt);
2003 SRpnt = *aSRpnt = NULL;
2004 if (transfer == blks) { /* We did not get anything, error */
2005 st_printk(KERN_NOTICE, STp,
2006 "Incorrect "
2007 "block size.\n");
2008 if (STps->drv_block >= 0)
2009 STps->drv_block += blks - transfer + 1;
2010 st_int_ioctl(STp, MTBSR, 1);
2011 return (-EIO);
2012 }
2013 /* We have some data, deliver it */
2014 STbp->buffer_bytes = (blks - transfer) *
2015 STp->block_size;
2016 DEBC_printk(STp, "ILI but "
2017 "enough data "
2018 "received %ld "
2019 "%d.\n", count,
2020 STbp->buffer_bytes);
2021 if (STps->drv_block >= 0)
2022 STps->drv_block += 1;
2023 if (st_int_ioctl(STp, MTBSR, 1))
2024 return (-EIO);
2025 }
2026 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2027 if (STps->eof != ST_FM_HIT)
2028 STps->eof = ST_FM_HIT;
2029 else
2030 STps->eof = ST_EOD_2;
2031 if (STp->block_size == 0)
2032 STbp->buffer_bytes = 0;
2033 else
2034 STbp->buffer_bytes =
2035 bytes - transfer * STp->block_size;
2036 DEBC_printk(STp, "EOF detected (%d "
2037 "bytes read).\n",
2038 STbp->buffer_bytes);
2039 } else if (cmdstatp->flags & SENSE_EOM) {
2040 if (STps->eof == ST_FM)
2041 STps->eof = ST_EOD_1;
2042 else
2043 STps->eof = ST_EOM_OK;
2044 if (STp->block_size == 0)
2045 STbp->buffer_bytes = bytes - transfer;
2046 else
2047 STbp->buffer_bytes =
2048 bytes - transfer * STp->block_size;
2049
2050 DEBC_printk(STp, "EOM detected (%d "
2051 "bytes read).\n",
2052 STbp->buffer_bytes);
2053 }
2054 }
2055 /* end of EOF, EOM, ILI test */
2056 else { /* nonzero sense key */
2057 DEBC_printk(STp, "Tape error while reading.\n");
2058 STps->drv_block = (-1);
2059 if (STps->eof == ST_FM &&
2060 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2061 DEBC_printk(STp, "Zero returned for "
2062 "first BLANK CHECK "
2063 "after EOF.\n");
2064 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2065 } else /* Some other extended sense code */
2066 retval = (-EIO);
2067 }
2068
2069 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2070 STbp->buffer_bytes = 0;
2071 }
2072 /* End of extended sense test */
2073 else { /* Non-extended sense */
2074 retval = STbp->syscall_result;
2075 }
2076
2077 }
2078 /* End of error handling */
2079 else { /* Read successful */
2080 STbp->buffer_bytes = bytes;
2081 if (STp->sili) /* In fixed block mode residual is always zero here */
2082 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2083 }
2084
2085 if (STps->drv_block >= 0) {
2086 if (STp->block_size == 0)
2087 STps->drv_block++;
2088 else
2089 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2090 }
2091 return retval;
2092 }
2093 \f
2094
2095 /* Read command */
2096 static ssize_t
2097 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2098 {
2099 ssize_t total;
2100 ssize_t retval = 0;
2101 ssize_t i, transfer;
2102 int special, do_dio = 0;
2103 struct st_request *SRpnt = NULL;
2104 struct scsi_tape *STp = filp->private_data;
2105 struct st_modedef *STm;
2106 struct st_partstat *STps;
2107 struct st_buffer *STbp = STp->buffer;
2108
2109 if (mutex_lock_interruptible(&STp->lock))
2110 return -ERESTARTSYS;
2111
2112 retval = rw_checks(STp, filp, count);
2113 if (retval || count == 0)
2114 goto out;
2115
2116 STm = &(STp->modes[STp->current_mode]);
2117 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2118 if (!STm->do_read_ahead) {
2119 retval = (-EINVAL); /* Read must be integral number of blocks */
2120 goto out;
2121 }
2122 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2123 }
2124
2125 STps = &(STp->ps[STp->partition]);
2126 if (STps->rw == ST_WRITING) {
2127 retval = flush_buffer(STp, 0);
2128 if (retval)
2129 goto out;
2130 STps->rw = ST_READING;
2131 }
2132 DEB(
2133 if (debugging && STps->eof != ST_NOEOF)
2134 st_printk(ST_DEB_MSG, STp,
2135 "EOF/EOM flag up (%d). Bytes %d\n",
2136 STps->eof, STbp->buffer_bytes);
2137 ) /* end DEB */
2138
2139 retval = setup_buffering(STp, buf, count, 1);
2140 if (retval)
2141 goto out;
2142 do_dio = STbp->do_dio;
2143
2144 if (STbp->buffer_bytes == 0 &&
2145 STps->eof >= ST_EOD_1) {
2146 if (STps->eof < ST_EOD) {
2147 STps->eof += 1;
2148 retval = 0;
2149 goto out;
2150 }
2151 retval = (-EIO); /* EOM or Blank Check */
2152 goto out;
2153 }
2154
2155 if (do_dio) {
2156 /* Check the buffer writability before any tape movement. Don't alter
2157 buffer data. */
2158 if (copy_from_user(&i, buf, 1) != 0 ||
2159 copy_to_user(buf, &i, 1) != 0 ||
2160 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2161 copy_to_user(buf + count - 1, &i, 1) != 0) {
2162 retval = (-EFAULT);
2163 goto out;
2164 }
2165 }
2166
2167 STps->rw = ST_READING;
2168
2169
2170 /* Loop until enough data in buffer or a special condition found */
2171 for (total = 0, special = 0; total < count && !special;) {
2172
2173 /* Get new data if the buffer is empty */
2174 if (STbp->buffer_bytes == 0) {
2175 special = read_tape(STp, count - total, &SRpnt);
2176 if (special < 0) { /* No need to continue read */
2177 retval = special;
2178 goto out;
2179 }
2180 }
2181
2182 /* Move the data from driver buffer to user buffer */
2183 if (STbp->buffer_bytes > 0) {
2184 DEB(
2185 if (debugging && STps->eof != ST_NOEOF)
2186 st_printk(ST_DEB_MSG, STp,
2187 "EOF up (%d). Left %d, needed %d.\n",
2188 STps->eof, STbp->buffer_bytes,
2189 (int)(count - total));
2190 ) /* end DEB */
2191 transfer = STbp->buffer_bytes < count - total ?
2192 STbp->buffer_bytes : count - total;
2193 if (!do_dio) {
2194 i = from_buffer(STbp, buf, transfer);
2195 if (i) {
2196 retval = i;
2197 goto out;
2198 }
2199 }
2200 buf += transfer;
2201 total += transfer;
2202 }
2203
2204 if (STp->block_size == 0)
2205 break; /* Read only one variable length block */
2206
2207 } /* for (total = 0, special = 0;
2208 total < count && !special; ) */
2209
2210 /* Change the eof state if no data from tape or buffer */
2211 if (total == 0) {
2212 if (STps->eof == ST_FM_HIT) {
2213 STps->eof = ST_FM;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_1) {
2218 STps->eof = ST_EOD_2;
2219 STps->drv_block = 0;
2220 if (STps->drv_file >= 0)
2221 STps->drv_file++;
2222 } else if (STps->eof == ST_EOD_2)
2223 STps->eof = ST_EOD;
2224 } else if (STps->eof == ST_FM)
2225 STps->eof = ST_NOEOF;
2226 retval = total;
2227
2228 out:
2229 if (SRpnt != NULL) {
2230 st_release_request(SRpnt);
2231 SRpnt = NULL;
2232 }
2233 if (do_dio) {
2234 release_buffering(STp, 1);
2235 STbp->buffer_bytes = 0;
2236 }
2237 mutex_unlock(&STp->lock);
2238
2239 return retval;
2240 }
2241 \f
2242
2243
2244 DEB(
2245 /* Set the driver options */
2246 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2247 {
2248 if (debugging) {
2249 st_printk(KERN_INFO, STp,
2250 "Mode %d options: buffer writes: %d, "
2251 "async writes: %d, read ahead: %d\n",
2252 STp->current_mode, STm->do_buffer_writes,
2253 STm->do_async_writes, STm->do_read_ahead);
2254 st_printk(KERN_INFO, STp,
2255 " can bsr: %d, two FMs: %d, "
2256 "fast mteom: %d, auto lock: %d,\n",
2257 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2258 STp->do_auto_lock);
2259 st_printk(KERN_INFO, STp,
2260 " defs for wr: %d, no block limits: %d, "
2261 "partitions: %d, s2 log: %d\n",
2262 STm->defaults_for_writes, STp->omit_blklims,
2263 STp->can_partitions, STp->scsi2_logical);
2264 st_printk(KERN_INFO, STp,
2265 " sysv: %d nowait: %d sili: %d "
2266 "nowait_filemark: %d\n",
2267 STm->sysv, STp->immediate, STp->sili,
2268 STp->immediate_filemark);
2269 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2270 }
2271 }
2272 )
2273
2274
2275 static int st_set_options(struct scsi_tape *STp, long options)
2276 {
2277 int value;
2278 long code;
2279 struct st_modedef *STm;
2280 struct cdev *cd0, *cd1;
2281 struct device *d0, *d1;
2282
2283 STm = &(STp->modes[STp->current_mode]);
2284 if (!STm->defined) {
2285 cd0 = STm->cdevs[0];
2286 cd1 = STm->cdevs[1];
2287 d0 = STm->devs[0];
2288 d1 = STm->devs[1];
2289 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2290 STm->cdevs[0] = cd0;
2291 STm->cdevs[1] = cd1;
2292 STm->devs[0] = d0;
2293 STm->devs[1] = d1;
2294 modes_defined = 1;
2295 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2296 STp->current_mode);
2297 }
2298
2299 code = options & MT_ST_OPTIONS;
2300 if (code == MT_ST_BOOLEANS) {
2301 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2302 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2303 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2304 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2305 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2306 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2307 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2308 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2309 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2310 if ((STp->device)->scsi_level >= SCSI_2)
2311 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2312 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2313 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2314 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2315 STm->sysv = (options & MT_ST_SYSV) != 0;
2316 STp->sili = (options & MT_ST_SILI) != 0;
2317 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2318 st_log_options(STp, STm); )
2319 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2320 value = (code == MT_ST_SETBOOLEANS);
2321 if ((options & MT_ST_BUFFER_WRITES) != 0)
2322 STm->do_buffer_writes = value;
2323 if ((options & MT_ST_ASYNC_WRITES) != 0)
2324 STm->do_async_writes = value;
2325 if ((options & MT_ST_DEF_WRITES) != 0)
2326 STm->defaults_for_writes = value;
2327 if ((options & MT_ST_READ_AHEAD) != 0)
2328 STm->do_read_ahead = value;
2329 if ((options & MT_ST_TWO_FM) != 0)
2330 STp->two_fm = value;
2331 if ((options & MT_ST_FAST_MTEOM) != 0)
2332 STp->fast_mteom = value;
2333 if ((options & MT_ST_AUTO_LOCK) != 0)
2334 STp->do_auto_lock = value;
2335 if ((options & MT_ST_CAN_BSR) != 0)
2336 STp->can_bsr = value;
2337 if ((options & MT_ST_NO_BLKLIMS) != 0)
2338 STp->omit_blklims = value;
2339 if ((STp->device)->scsi_level >= SCSI_2 &&
2340 (options & MT_ST_CAN_PARTITIONS) != 0)
2341 STp->can_partitions = value;
2342 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2343 STp->scsi2_logical = value;
2344 if ((options & MT_ST_NOWAIT) != 0)
2345 STp->immediate = value;
2346 if ((options & MT_ST_NOWAIT_EOF) != 0)
2347 STp->immediate_filemark = value;
2348 if ((options & MT_ST_SYSV) != 0)
2349 STm->sysv = value;
2350 if ((options & MT_ST_SILI) != 0)
2351 STp->sili = value;
2352 DEB(
2353 if ((options & MT_ST_DEBUGGING) != 0)
2354 debugging = value;
2355 st_log_options(STp, STm); )
2356 } else if (code == MT_ST_WRITE_THRESHOLD) {
2357 /* Retained for compatibility */
2358 } else if (code == MT_ST_DEF_BLKSIZE) {
2359 value = (options & ~MT_ST_OPTIONS);
2360 if (value == ~MT_ST_OPTIONS) {
2361 STm->default_blksize = (-1);
2362 DEBC_printk(STp, "Default block size disabled.\n");
2363 } else {
2364 STm->default_blksize = value;
2365 DEBC_printk(STp,"Default block size set to "
2366 "%d bytes.\n", STm->default_blksize);
2367 if (STp->ready == ST_READY) {
2368 STp->blksize_changed = 0;
2369 set_mode_densblk(STp, STm);
2370 }
2371 }
2372 } else if (code == MT_ST_TIMEOUTS) {
2373 value = (options & ~MT_ST_OPTIONS);
2374 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2375 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2376 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2377 (value & ~MT_ST_SET_LONG_TIMEOUT));
2378 } else {
2379 blk_queue_rq_timeout(STp->device->request_queue,
2380 value * HZ);
2381 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2382 value);
2383 }
2384 } else if (code == MT_ST_SET_CLN) {
2385 value = (options & ~MT_ST_OPTIONS) & 0xff;
2386 if (value != 0 &&
2387 (value < EXTENDED_SENSE_START ||
2388 value >= SCSI_SENSE_BUFFERSIZE))
2389 return (-EINVAL);
2390 STp->cln_mode = value;
2391 STp->cln_sense_mask = (options >> 8) & 0xff;
2392 STp->cln_sense_value = (options >> 16) & 0xff;
2393 st_printk(KERN_INFO, STp,
2394 "Cleaning request mode %d, mask %02x, value %02x\n",
2395 value, STp->cln_sense_mask, STp->cln_sense_value);
2396 } else if (code == MT_ST_DEF_OPTIONS) {
2397 code = (options & ~MT_ST_CLEAR_DEFAULT);
2398 value = (options & MT_ST_CLEAR_DEFAULT);
2399 if (code == MT_ST_DEF_DENSITY) {
2400 if (value == MT_ST_CLEAR_DEFAULT) {
2401 STm->default_density = (-1);
2402 DEBC_printk(STp,
2403 "Density default disabled.\n");
2404 } else {
2405 STm->default_density = value & 0xff;
2406 DEBC_printk(STp, "Density default set to %x\n",
2407 STm->default_density);
2408 if (STp->ready == ST_READY) {
2409 STp->density_changed = 0;
2410 set_mode_densblk(STp, STm);
2411 }
2412 }
2413 } else if (code == MT_ST_DEF_DRVBUFFER) {
2414 if (value == MT_ST_CLEAR_DEFAULT) {
2415 STp->default_drvbuffer = 0xff;
2416 DEBC_printk(STp,
2417 "Drive buffer default disabled.\n");
2418 } else {
2419 STp->default_drvbuffer = value & 7;
2420 DEBC_printk(STp,
2421 "Drive buffer default set to %x\n",
2422 STp->default_drvbuffer);
2423 if (STp->ready == ST_READY)
2424 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2425 }
2426 } else if (code == MT_ST_DEF_COMPRESSION) {
2427 if (value == MT_ST_CLEAR_DEFAULT) {
2428 STm->default_compression = ST_DONT_TOUCH;
2429 DEBC_printk(STp,
2430 "Compression default disabled.\n");
2431 } else {
2432 if ((value & 0xff00) != 0) {
2433 STp->c_algo = (value & 0xff00) >> 8;
2434 DEBC_printk(STp, "Compression "
2435 "algorithm set to 0x%x.\n",
2436 STp->c_algo);
2437 }
2438 if ((value & 0xff) != 0xff) {
2439 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2440 DEBC_printk(STp, "Compression default "
2441 "set to %x\n",
2442 (value & 1));
2443 if (STp->ready == ST_READY) {
2444 STp->compression_changed = 0;
2445 st_compression(STp, (STm->default_compression == ST_YES));
2446 }
2447 }
2448 }
2449 }
2450 } else
2451 return (-EIO);
2452
2453 return 0;
2454 }
2455 \f
2456 #define MODE_HEADER_LENGTH 4
2457
2458 /* Mode header and page byte offsets */
2459 #define MH_OFF_DATA_LENGTH 0
2460 #define MH_OFF_MEDIUM_TYPE 1
2461 #define MH_OFF_DEV_SPECIFIC 2
2462 #define MH_OFF_BDESCS_LENGTH 3
2463 #define MP_OFF_PAGE_NBR 0
2464 #define MP_OFF_PAGE_LENGTH 1
2465
2466 /* Mode header and page bit masks */
2467 #define MH_BIT_WP 0x80
2468 #define MP_MSK_PAGE_NBR 0x3f
2469
2470 /* Don't return block descriptors */
2471 #define MODE_SENSE_OMIT_BDESCS 0x08
2472
2473 #define MODE_SELECT_PAGE_FORMAT 0x10
2474
2475 /* Read a mode page into the tape buffer. The block descriptors are included
2476 if incl_block_descs is true. The page control is ored to the page number
2477 parameter, if necessary. */
2478 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2479 {
2480 unsigned char cmd[MAX_COMMAND_SIZE];
2481 struct st_request *SRpnt;
2482
2483 memset(cmd, 0, MAX_COMMAND_SIZE);
2484 cmd[0] = MODE_SENSE;
2485 if (omit_block_descs)
2486 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2487 cmd[2] = page;
2488 cmd[4] = 255;
2489
2490 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2491 STp->device->request_queue->rq_timeout, 0, 1);
2492 if (SRpnt == NULL)
2493 return (STp->buffer)->syscall_result;
2494
2495 st_release_request(SRpnt);
2496
2497 return STp->buffer->syscall_result;
2498 }
2499
2500
2501 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2502 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2503 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2504 {
2505 int pgo;
2506 unsigned char cmd[MAX_COMMAND_SIZE];
2507 struct st_request *SRpnt;
2508 int timeout;
2509
2510 memset(cmd, 0, MAX_COMMAND_SIZE);
2511 cmd[0] = MODE_SELECT;
2512 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2513 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2514 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2515
2516 /* Clear reserved fields */
2517 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2518 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2519 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2520 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2521
2522 timeout = slow ?
2523 STp->long_timeout : STp->device->request_queue->rq_timeout;
2524 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2525 timeout, 0, 1);
2526 if (SRpnt == NULL)
2527 return (STp->buffer)->syscall_result;
2528
2529 st_release_request(SRpnt);
2530
2531 return STp->buffer->syscall_result;
2532 }
2533
2534
2535 #define COMPRESSION_PAGE 0x0f
2536 #define COMPRESSION_PAGE_LENGTH 16
2537
2538 #define CP_OFF_DCE_DCC 2
2539 #define CP_OFF_C_ALGO 7
2540
2541 #define DCE_MASK 0x80
2542 #define DCC_MASK 0x40
2543 #define RED_MASK 0x60
2544
2545
2546 /* Control the compression with mode page 15. Algorithm not changed if zero.
2547
2548 The block descriptors are read and written because Sony SDT-7000 does not
2549 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2550 Including block descriptors should not cause any harm to other drives. */
2551
2552 static int st_compression(struct scsi_tape * STp, int state)
2553 {
2554 int retval;
2555 int mpoffs; /* Offset to mode page start */
2556 unsigned char *b_data = (STp->buffer)->b_data;
2557
2558 if (STp->ready != ST_READY)
2559 return (-EIO);
2560
2561 /* Read the current page contents */
2562 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2563 if (retval) {
2564 DEBC_printk(STp, "Compression mode page not supported.\n");
2565 return (-EIO);
2566 }
2567
2568 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2569 DEBC_printk(STp, "Compression state is %d.\n",
2570 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2571
2572 /* Check if compression can be changed */
2573 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2574 DEBC_printk(STp, "Compression not supported.\n");
2575 return (-EIO);
2576 }
2577
2578 /* Do the change */
2579 if (state) {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2583 }
2584 else {
2585 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2586 if (STp->c_algo != 0)
2587 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2588 }
2589
2590 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2591 if (retval) {
2592 DEBC_printk(STp, "Compression change failed.\n");
2593 return (-EIO);
2594 }
2595 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2596
2597 STp->compression_changed = 1;
2598 return 0;
2599 }
2600
2601
2602 /* Process the load and unload commands (does unload if the load code is zero) */
2603 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2604 {
2605 int retval = (-EIO), timeout;
2606 unsigned char cmd[MAX_COMMAND_SIZE];
2607 struct st_partstat *STps;
2608 struct st_request *SRpnt;
2609
2610 if (STp->ready != ST_READY && !load_code) {
2611 if (STp->ready == ST_NO_TAPE)
2612 return (-ENOMEDIUM);
2613 else
2614 return (-EIO);
2615 }
2616
2617 memset(cmd, 0, MAX_COMMAND_SIZE);
2618 cmd[0] = START_STOP;
2619 if (load_code)
2620 cmd[4] |= 1;
2621 /*
2622 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2623 */
2624 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2625 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2626 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2627 (cmd[4]) ? "" : "un",
2628 load_code - MT_ST_HPLOADER_OFFSET);
2629 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2630 }
2631 if (STp->immediate) {
2632 cmd[1] = 1; /* Don't wait for completion */
2633 timeout = STp->device->request_queue->rq_timeout;
2634 }
2635 else
2636 timeout = STp->long_timeout;
2637
2638 DEBC(
2639 if (!load_code)
2640 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2641 else
2642 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2643 );
2644
2645 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2646 timeout, MAX_RETRIES, 1);
2647 if (!SRpnt)
2648 return (STp->buffer)->syscall_result;
2649
2650 retval = (STp->buffer)->syscall_result;
2651 st_release_request(SRpnt);
2652
2653 if (!retval) { /* SCSI command successful */
2654
2655 if (!load_code) {
2656 STp->rew_at_close = 0;
2657 STp->ready = ST_NO_TAPE;
2658 }
2659 else {
2660 STp->rew_at_close = STp->autorew_dev;
2661 retval = check_tape(STp, filp);
2662 if (retval > 0)
2663 retval = 0;
2664 }
2665 }
2666 else {
2667 STps = &(STp->ps[STp->partition]);
2668 STps->drv_file = STps->drv_block = (-1);
2669 }
2670
2671 return retval;
2672 }
2673 \f
2674 #if DEBUG
2675 #define ST_DEB_FORWARD 0
2676 #define ST_DEB_BACKWARD 1
2677 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2678 {
2679 s32 sc;
2680
2681 if (!debugging)
2682 return;
2683
2684 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2685 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2686 if (direction)
2687 sc = -sc;
2688 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2689 direction ? "backward" : "forward", sc, units);
2690 }
2691 #else
2692 #define ST_DEB_FORWARD 0
2693 #define ST_DEB_BACKWARD 1
2694 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2695 #endif
2696
2697
2698 /* Internal ioctl function */
2699 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2700 {
2701 int timeout;
2702 long ltmp;
2703 int ioctl_result;
2704 int chg_eof = 1;
2705 unsigned char cmd[MAX_COMMAND_SIZE];
2706 struct st_request *SRpnt;
2707 struct st_partstat *STps;
2708 int fileno, blkno, at_sm, undone;
2709 int datalen = 0, direction = DMA_NONE;
2710
2711 WARN_ON(STp->buffer->do_dio != 0);
2712 if (STp->ready != ST_READY) {
2713 if (STp->ready == ST_NO_TAPE)
2714 return (-ENOMEDIUM);
2715 else
2716 return (-EIO);
2717 }
2718 timeout = STp->long_timeout;
2719 STps = &(STp->ps[STp->partition]);
2720 fileno = STps->drv_file;
2721 blkno = STps->drv_block;
2722 at_sm = STps->at_sm;
2723
2724 memset(cmd, 0, MAX_COMMAND_SIZE);
2725 switch (cmd_in) {
2726 case MTFSFM:
2727 chg_eof = 0; /* Changed from the FSF after this */
2728 case MTFSF:
2729 cmd[0] = SPACE;
2730 cmd[1] = 0x01; /* Space FileMarks */
2731 cmd[2] = (arg >> 16);
2732 cmd[3] = (arg >> 8);
2733 cmd[4] = arg;
2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2735 if (fileno >= 0)
2736 fileno += arg;
2737 blkno = 0;
2738 at_sm &= (arg == 0);
2739 break;
2740 case MTBSFM:
2741 chg_eof = 0; /* Changed from the FSF after this */
2742 case MTBSF:
2743 cmd[0] = SPACE;
2744 cmd[1] = 0x01; /* Space FileMarks */
2745 ltmp = (-arg);
2746 cmd[2] = (ltmp >> 16);
2747 cmd[3] = (ltmp >> 8);
2748 cmd[4] = ltmp;
2749 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2750 if (fileno >= 0)
2751 fileno -= arg;
2752 blkno = (-1); /* We can't know the block number */
2753 at_sm &= (arg == 0);
2754 break;
2755 case MTFSR:
2756 cmd[0] = SPACE;
2757 cmd[1] = 0x00; /* Space Blocks */
2758 cmd[2] = (arg >> 16);
2759 cmd[3] = (arg >> 8);
2760 cmd[4] = arg;
2761 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2762 if (blkno >= 0)
2763 blkno += arg;
2764 at_sm &= (arg == 0);
2765 break;
2766 case MTBSR:
2767 cmd[0] = SPACE;
2768 cmd[1] = 0x00; /* Space Blocks */
2769 ltmp = (-arg);
2770 cmd[2] = (ltmp >> 16);
2771 cmd[3] = (ltmp >> 8);
2772 cmd[4] = ltmp;
2773 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2774 if (blkno >= 0)
2775 blkno -= arg;
2776 at_sm &= (arg == 0);
2777 break;
2778 case MTFSS:
2779 cmd[0] = SPACE;
2780 cmd[1] = 0x04; /* Space Setmarks */
2781 cmd[2] = (arg >> 16);
2782 cmd[3] = (arg >> 8);
2783 cmd[4] = arg;
2784 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2785 if (arg != 0) {
2786 blkno = fileno = (-1);
2787 at_sm = 1;
2788 }
2789 break;
2790 case MTBSS:
2791 cmd[0] = SPACE;
2792 cmd[1] = 0x04; /* Space Setmarks */
2793 ltmp = (-arg);
2794 cmd[2] = (ltmp >> 16);
2795 cmd[3] = (ltmp >> 8);
2796 cmd[4] = ltmp;
2797 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2798 if (arg != 0) {
2799 blkno = fileno = (-1);
2800 at_sm = 1;
2801 }
2802 break;
2803 case MTWEOF:
2804 case MTWEOFI:
2805 case MTWSM:
2806 if (STp->write_prot)
2807 return (-EACCES);
2808 cmd[0] = WRITE_FILEMARKS;
2809 if (cmd_in == MTWSM)
2810 cmd[1] = 2;
2811 if (cmd_in == MTWEOFI ||
2812 (cmd_in == MTWEOF && STp->immediate_filemark))
2813 cmd[1] |= 1;
2814 cmd[2] = (arg >> 16);
2815 cmd[3] = (arg >> 8);
2816 cmd[4] = arg;
2817 timeout = STp->device->request_queue->rq_timeout;
2818 DEBC(
2819 if (cmd_in != MTWSM)
2820 st_printk(ST_DEB_MSG, STp,
2821 "Writing %d filemarks.\n",
2822 cmd[2] * 65536 +
2823 cmd[3] * 256 +
2824 cmd[4]);
2825 else
2826 st_printk(ST_DEB_MSG, STp,
2827 "Writing %d setmarks.\n",
2828 cmd[2] * 65536 +
2829 cmd[3] * 256 +
2830 cmd[4]);
2831 )
2832 if (fileno >= 0)
2833 fileno += arg;
2834 blkno = 0;
2835 at_sm = (cmd_in == MTWSM);
2836 break;
2837 case MTREW:
2838 cmd[0] = REZERO_UNIT;
2839 if (STp->immediate) {
2840 cmd[1] = 1; /* Don't wait for completion */
2841 timeout = STp->device->request_queue->rq_timeout;
2842 }
2843 DEBC_printk(STp, "Rewinding tape.\n");
2844 fileno = blkno = at_sm = 0;
2845 break;
2846 case MTNOP:
2847 DEBC_printk(STp, "No op on tape.\n");
2848 return 0; /* Should do something ? */
2849 break;
2850 case MTRETEN:
2851 cmd[0] = START_STOP;
2852 if (STp->immediate) {
2853 cmd[1] = 1; /* Don't wait for completion */
2854 timeout = STp->device->request_queue->rq_timeout;
2855 }
2856 cmd[4] = 3;
2857 DEBC_printk(STp, "Retensioning tape.\n");
2858 fileno = blkno = at_sm = 0;
2859 break;
2860 case MTEOM:
2861 if (!STp->fast_mteom) {
2862 /* space to the end of tape */
2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2864 fileno = STps->drv_file;
2865 if (STps->eof >= ST_EOD_1)
2866 return 0;
2867 /* The next lines would hide the number of spaced FileMarks
2868 That's why I inserted the previous lines. I had no luck
2869 with detecting EOM with FSF, so we go now to EOM.
2870 Joerg Weule */
2871 } else
2872 fileno = (-1);
2873 cmd[0] = SPACE;
2874 cmd[1] = 3;
2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2876 blkno = -1;
2877 at_sm = 0;
2878 break;
2879 case MTERASE:
2880 if (STp->write_prot)
2881 return (-EACCES);
2882 cmd[0] = ERASE;
2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2884 if (STp->immediate) {
2885 cmd[1] |= 2; /* Don't wait for completion */
2886 timeout = STp->device->request_queue->rq_timeout;
2887 }
2888 else
2889 timeout = STp->long_timeout * 8;
2890
2891 DEBC_printk(STp, "Erasing tape.\n");
2892 fileno = blkno = at_sm = 0;
2893 break;
2894 case MTSETBLK: /* Set block length */
2895 case MTSETDENSITY: /* Set tape density */
2896 case MTSETDRVBUFFER: /* Set drive buffering */
2897 case SET_DENS_AND_BLK: /* Set density and block size */
2898 chg_eof = 0;
2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2900 return (-EIO); /* Not allowed if data in buffer */
2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2902 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2903 STp->max_block > 0 &&
2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2907 return (-EINVAL);
2908 }
2909 cmd[0] = MODE_SELECT;
2910 if ((STp->use_pf & USE_PF))
2911 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2912 cmd[4] = datalen = 12;
2913 direction = DMA_TO_DEVICE;
2914
2915 memset((STp->buffer)->b_data, 0, 12);
2916 if (cmd_in == MTSETDRVBUFFER)
2917 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2918 else
2919 (STp->buffer)->b_data[2] =
2920 STp->drv_buffer << 4;
2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2922 if (cmd_in == MTSETDENSITY) {
2923 (STp->buffer)->b_data[4] = arg;
2924 STp->density_changed = 1; /* At least we tried ;-) */
2925 } else if (cmd_in == SET_DENS_AND_BLK)
2926 (STp->buffer)->b_data[4] = arg >> 24;
2927 else
2928 (STp->buffer)->b_data[4] = STp->density;
2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2930 ltmp = arg & MT_ST_BLKSIZE_MASK;
2931 if (cmd_in == MTSETBLK)
2932 STp->blksize_changed = 1; /* At least we tried ;-) */
2933 } else
2934 ltmp = STp->block_size;
2935 (STp->buffer)->b_data[9] = (ltmp >> 16);
2936 (STp->buffer)->b_data[10] = (ltmp >> 8);
2937 (STp->buffer)->b_data[11] = ltmp;
2938 timeout = STp->device->request_queue->rq_timeout;
2939 DEBC(
2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2941 st_printk(ST_DEB_MSG, STp,
2942 "Setting block size to %d bytes.\n",
2943 (STp->buffer)->b_data[9] * 65536 +
2944 (STp->buffer)->b_data[10] * 256 +
2945 (STp->buffer)->b_data[11]);
2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2947 st_printk(ST_DEB_MSG, STp,
2948 "Setting density code to %x.\n",
2949 (STp->buffer)->b_data[4]);
2950 if (cmd_in == MTSETDRVBUFFER)
2951 st_printk(ST_DEB_MSG, STp,
2952 "Setting drive buffer code to %d.\n",
2953 ((STp->buffer)->b_data[2] >> 4) & 7);
2954 )
2955 break;
2956 default:
2957 return (-ENOSYS);
2958 }
2959
2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2961 timeout, MAX_RETRIES, 1);
2962 if (!SRpnt)
2963 return (STp->buffer)->syscall_result;
2964
2965 ioctl_result = (STp->buffer)->syscall_result;
2966
2967 if (!ioctl_result) { /* SCSI command successful */
2968 st_release_request(SRpnt);
2969 SRpnt = NULL;
2970 STps->drv_block = blkno;
2971 STps->drv_file = fileno;
2972 STps->at_sm = at_sm;
2973
2974 if (cmd_in == MTBSFM)
2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2976 else if (cmd_in == MTFSFM)
2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2978
2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2981 if (STp->block_size != 0) {
2982 (STp->buffer)->buffer_blocks =
2983 (STp->buffer)->buffer_size / STp->block_size;
2984 }
2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2986 if (cmd_in == SET_DENS_AND_BLK)
2987 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2988 } else if (cmd_in == MTSETDRVBUFFER)
2989 STp->drv_buffer = (arg & 7);
2990 else if (cmd_in == MTSETDENSITY)
2991 STp->density = arg;
2992
2993 if (cmd_in == MTEOM)
2994 STps->eof = ST_EOD;
2995 else if (cmd_in == MTFSF)
2996 STps->eof = ST_FM;
2997 else if (chg_eof)
2998 STps->eof = ST_NOEOF;
2999
3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3002 } else { /* SCSI command was not completely successful. Don't return
3003 from this block without releasing the SCSI command block! */
3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3005
3006 if (cmdstatp->flags & SENSE_EOM) {
3007 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3008 cmd_in != MTBSR && cmd_in != MTBSS)
3009 STps->eof = ST_EOM_OK;
3010 STps->drv_block = 0;
3011 }
3012
3013 if (cmdstatp->remainder_valid)
3014 undone = (int)cmdstatp->uremainder64;
3015 else
3016 undone = 0;
3017
3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3019 cmdstatp->have_sense &&
3020 (cmdstatp->flags & SENSE_EOM)) {
3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3024 STps->eof = ST_NOEOF;
3025 } else { /* Writing EOF(s) failed */
3026 if (fileno >= 0)
3027 fileno -= undone;
3028 if (undone < arg)
3029 STps->eof = ST_NOEOF;
3030 }
3031 STps->drv_file = fileno;
3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3033 if (fileno >= 0)
3034 STps->drv_file = fileno - undone;
3035 else
3036 STps->drv_file = fileno;
3037 STps->drv_block = -1;
3038 STps->eof = ST_NOEOF;
3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3041 undone = (-undone);
3042 if (STps->drv_file >= 0)
3043 STps->drv_file = fileno + undone;
3044 STps->drv_block = 0;
3045 STps->eof = ST_NOEOF;
3046 } else if (cmd_in == MTFSR) {
3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3048 if (STps->drv_file >= 0)
3049 STps->drv_file++;
3050 STps->drv_block = 0;
3051 STps->eof = ST_FM;
3052 } else {
3053 if (blkno >= undone)
3054 STps->drv_block = blkno - undone;
3055 else
3056 STps->drv_block = (-1);
3057 STps->eof = ST_NOEOF;
3058 }
3059 } else if (cmd_in == MTBSR) {
3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3061 STps->drv_file--;
3062 STps->drv_block = (-1);
3063 } else {
3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3065 undone = (-undone);
3066 if (STps->drv_block >= 0)
3067 STps->drv_block = blkno + undone;
3068 }
3069 STps->eof = ST_NOEOF;
3070 } else if (cmd_in == MTEOM) {
3071 STps->drv_file = (-1);
3072 STps->drv_block = (-1);
3073 STps->eof = ST_EOD;
3074 } else if (cmd_in == MTSETBLK ||
3075 cmd_in == MTSETDENSITY ||
3076 cmd_in == MTSETDRVBUFFER ||
3077 cmd_in == SET_DENS_AND_BLK) {
3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3079 !(STp->use_pf & PF_TESTED)) {
3080 /* Try the other possible state of Page Format if not
3081 already tried */
3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3083 st_release_request(SRpnt);
3084 SRpnt = NULL;
3085 return st_int_ioctl(STp, cmd_in, arg);
3086 }
3087 } else if (chg_eof)
3088 STps->eof = ST_NOEOF;
3089
3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3091 STps->eof = ST_EOD;
3092
3093 st_release_request(SRpnt);
3094 SRpnt = NULL;
3095 }
3096
3097 return ioctl_result;
3098 }
3099 \f
3100
3101 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3102 structure. */
3103
3104 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3105 int logical)
3106 {
3107 int result;
3108 unsigned char scmd[MAX_COMMAND_SIZE];
3109 struct st_request *SRpnt;
3110
3111 if (STp->ready != ST_READY)
3112 return (-EIO);
3113
3114 memset(scmd, 0, MAX_COMMAND_SIZE);
3115 if ((STp->device)->scsi_level < SCSI_2) {
3116 scmd[0] = QFA_REQUEST_BLOCK;
3117 scmd[4] = 3;
3118 } else {
3119 scmd[0] = READ_POSITION;
3120 if (!logical && !STp->scsi2_logical)
3121 scmd[1] = 1;
3122 }
3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3124 STp->device->request_queue->rq_timeout,
3125 MAX_READY_RETRIES, 1);
3126 if (!SRpnt)
3127 return (STp->buffer)->syscall_result;
3128
3129 if ((STp->buffer)->syscall_result != 0 ||
3130 (STp->device->scsi_level >= SCSI_2 &&
3131 ((STp->buffer)->b_data[0] & 4) != 0)) {
3132 *block = *partition = 0;
3133 DEBC_printk(STp, " Can't read tape position.\n");
3134 result = (-EIO);
3135 } else {
3136 result = 0;
3137 if ((STp->device)->scsi_level < SCSI_2) {
3138 *block = ((STp->buffer)->b_data[0] << 16)
3139 + ((STp->buffer)->b_data[1] << 8)
3140 + (STp->buffer)->b_data[2];
3141 *partition = 0;
3142 } else {
3143 *block = ((STp->buffer)->b_data[4] << 24)
3144 + ((STp->buffer)->b_data[5] << 16)
3145 + ((STp->buffer)->b_data[6] << 8)
3146 + (STp->buffer)->b_data[7];
3147 *partition = (STp->buffer)->b_data[1];
3148 if (((STp->buffer)->b_data[0] & 0x80) &&
3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3151 }
3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3153 *block, *partition);
3154 }
3155 st_release_request(SRpnt);
3156 SRpnt = NULL;
3157
3158 return result;
3159 }
3160
3161
3162 /* Set the tape block and partition. Negative partition means that only the
3163 block should be set in vendor specific way. */
3164 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3165 int logical)
3166 {
3167 struct st_partstat *STps;
3168 int result, p;
3169 unsigned int blk;
3170 int timeout;
3171 unsigned char scmd[MAX_COMMAND_SIZE];
3172 struct st_request *SRpnt;
3173
3174 if (STp->ready != ST_READY)
3175 return (-EIO);
3176 timeout = STp->long_timeout;
3177 STps = &(STp->ps[STp->partition]);
3178
3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3180 block, partition);
3181 DEB(if (partition < 0)
3182 return (-EIO); )
3183
3184 /* Update the location at the partition we are leaving */
3185 if ((!STp->can_partitions && partition != 0) ||
3186 partition >= ST_NBR_PARTITIONS)
3187 return (-EINVAL);
3188 if (partition != STp->partition) {
3189 if (get_location(STp, &blk, &p, 1))
3190 STps->last_block_valid = 0;
3191 else {
3192 STps->last_block_valid = 1;
3193 STps->last_block_visited = blk;
3194 DEBC_printk(STp, "Visited block %d for "
3195 "partition %d saved.\n",
3196 blk, STp->partition);
3197 }
3198 }
3199
3200 memset(scmd, 0, MAX_COMMAND_SIZE);
3201 if ((STp->device)->scsi_level < SCSI_2) {
3202 scmd[0] = QFA_SEEK_BLOCK;
3203 scmd[2] = (block >> 16);
3204 scmd[3] = (block >> 8);
3205 scmd[4] = block;
3206 scmd[5] = 0;
3207 } else {
3208 scmd[0] = SEEK_10;
3209 scmd[3] = (block >> 24);
3210 scmd[4] = (block >> 16);
3211 scmd[5] = (block >> 8);
3212 scmd[6] = block;
3213 if (!logical && !STp->scsi2_logical)
3214 scmd[1] = 4;
3215 if (STp->partition != partition) {
3216 scmd[1] |= 2;
3217 scmd[8] = partition;
3218 DEBC_printk(STp, "Trying to change partition "
3219 "from %d to %d\n", STp->partition,
3220 partition);
3221 }
3222 }
3223 if (STp->immediate) {
3224 scmd[1] |= 1; /* Don't wait for completion */
3225 timeout = STp->device->request_queue->rq_timeout;
3226 }
3227
3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3229 timeout, MAX_READY_RETRIES, 1);
3230 if (!SRpnt)
3231 return (STp->buffer)->syscall_result;
3232
3233 STps->drv_block = STps->drv_file = (-1);
3234 STps->eof = ST_NOEOF;
3235 if ((STp->buffer)->syscall_result != 0) {
3236 result = (-EIO);
3237 if (STp->can_partitions &&
3238 (STp->device)->scsi_level >= SCSI_2 &&
3239 (p = find_partition(STp)) >= 0)
3240 STp->partition = p;
3241 } else {
3242 if (STp->can_partitions) {
3243 STp->partition = partition;
3244 STps = &(STp->ps[partition]);
3245 if (!STps->last_block_valid ||
3246 STps->last_block_visited != block) {
3247 STps->at_sm = 0;
3248 STps->rw = ST_IDLE;
3249 }
3250 } else
3251 STps->at_sm = 0;
3252 if (block == 0)
3253 STps->drv_block = STps->drv_file = 0;
3254 result = 0;
3255 }
3256
3257 st_release_request(SRpnt);
3258 SRpnt = NULL;
3259
3260 return result;
3261 }
3262
3263
3264 /* Find the current partition number for the drive status. Called from open and
3265 returns either partition number of negative error code. */
3266 static int find_partition(struct scsi_tape *STp)
3267 {
3268 int i, partition;
3269 unsigned int block;
3270
3271 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3272 return i;
3273 if (partition >= ST_NBR_PARTITIONS)
3274 return (-EIO);
3275 return partition;
3276 }
3277
3278
3279 /* Change the partition if necessary */
3280 static int switch_partition(struct scsi_tape *STp)
3281 {
3282 struct st_partstat *STps;
3283
3284 if (STp->partition == STp->new_partition)
3285 return 0;
3286 STps = &(STp->ps[STp->new_partition]);
3287 if (!STps->last_block_valid)
3288 STps->last_block_visited = 0;
3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3290 }
3291 \f
3292 /* Functions for reading and writing the medium partition mode page. */
3293
3294 #define PART_PAGE 0x11
3295 #define PART_PAGE_FIXED_LENGTH 8
3296
3297 #define PP_OFF_MAX_ADD_PARTS 2
3298 #define PP_OFF_NBR_ADD_PARTS 3
3299 #define PP_OFF_FLAGS 4
3300 #define PP_OFF_PART_UNITS 6
3301 #define PP_OFF_RESERVED 7
3302
3303 #define PP_BIT_IDP 0x20
3304 #define PP_BIT_FDP 0x80
3305 #define PP_MSK_PSUM_MB 0x10
3306 #define PP_MSK_PSUM_UNITS 0x18
3307 #define PP_MSK_POFM 0x04
3308
3309 /* Get the number of partitions on the tape. As a side effect reads the
3310 mode page into the tape buffer. */
3311 static int nbr_partitions(struct scsi_tape *STp)
3312 {
3313 int result;
3314
3315 if (STp->ready != ST_READY)
3316 return (-EIO);
3317
3318 result = read_mode_page(STp, PART_PAGE, 1);
3319
3320 if (result) {
3321 DEBC_printk(STp, "Can't read medium partition page.\n");
3322 result = (-EIO);
3323 } else {
3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3325 PP_OFF_NBR_ADD_PARTS] + 1;
3326 DEBC_printk(STp, "Number of partitions %d.\n", result);
3327 }
3328
3329 return result;
3330 }
3331
3332
3333 static int format_medium(struct scsi_tape *STp, int format)
3334 {
3335 int result = 0;
3336 int timeout = STp->long_timeout;
3337 unsigned char scmd[MAX_COMMAND_SIZE];
3338 struct st_request *SRpnt;
3339
3340 memset(scmd, 0, MAX_COMMAND_SIZE);
3341 scmd[0] = FORMAT_UNIT;
3342 scmd[2] = format;
3343 if (STp->immediate) {
3344 scmd[1] |= 1; /* Don't wait for completion */
3345 timeout = STp->device->request_queue->rq_timeout;
3346 }
3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3349 timeout, MAX_RETRIES, 1);
3350 if (!SRpnt)
3351 result = STp->buffer->syscall_result;
3352 return result;
3353 }
3354
3355
3356 /* Partition the tape into two partitions if size > 0 or one partition if
3357 size == 0.
3358
3359 The block descriptors are read and written because Sony SDT-7000 does not
3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3361
3362 My HP C1533A drive returns only one partition size field. This is used to
3363 set the size of partition 1. There is no size field for the default partition.
3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3366 The following algorithm is used to accommodate both drives: if the number of
3367 partition size fields is greater than the maximum number of additional partitions
3368 in the mode page, the second field is used. Otherwise the first field is used.
3369
3370 For Seagate DDS drives the page length must be 8 when no partitions is defined
3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3372 is acceptable also to some other old drives and enforced if the first partition
3373 size field is used for the first additional partition size.
3374
3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3376 */
3377 static int partition_tape(struct scsi_tape *STp, int size)
3378 {
3379 int result;
3380 int target_partition;
3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3382 int pgo, psd_cnt, psdo;
3383 int psum = PP_MSK_PSUM_MB, units = 0;
3384 unsigned char *bp;
3385
3386 result = read_mode_page(STp, PART_PAGE, 0);
3387 if (result) {
3388 DEBC_printk(STp, "Can't read partition mode page.\n");
3389 return result;
3390 }
3391 target_partition = 1;
3392 if (size < 0) {
3393 target_partition = 0;
3394 size = -size;
3395 }
3396
3397 /* The mode page is in the buffer. Let's modify it and write it. */
3398 bp = (STp->buffer)->b_data;
3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3400 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3402
3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3404
3405 if (scsi3) {
3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3407 if (needs_format && size == 0) {
3408 /* No need to write the mode page when clearing
3409 * partitioning
3410 */
3411 DEBC_printk(STp, "Formatting tape with one partition.\n");
3412 result = format_medium(STp, 0);
3413 goto out;
3414 }
3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3416 psd_cnt = 2;
3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3418 /* Use units scaling for large partitions if the device
3419 * suggests it and no precision lost. Required for IBM
3420 * TS1140/50 drives that don't support MB units.
3421 */
3422 if (size >= 1000 && (size % 1000) == 0) {
3423 size /= 1000;
3424 psum = PP_MSK_PSUM_UNITS;
3425 units = 9; /* GB */
3426 }
3427 }
3428 /* Try it anyway if too large to specify in MB */
3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3430 size /= 1000;
3431 psum = PP_MSK_PSUM_UNITS;
3432 units = 9; /* GB */
3433 }
3434 }
3435
3436 if (size >= 65535 || /* Does not fit into two bytes */
3437 (target_partition == 0 && psd_cnt < 2)) {
3438 result = -EINVAL;
3439 goto out;
3440 }
3441
3442 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3443 /* The second condition is for HP DDS which use only one partition size
3444 * descriptor
3445 */
3446 if (target_partition > 0 &&
3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3450 psdo += 2;
3451 }
3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3453
3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3457
3458 if (size == 0) {
3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3462 DEBC_printk(STp, "Formatting tape with one partition.\n");
3463 } else {
3464 bp[psdo] = (size >> 8) & 0xff;
3465 bp[psdo + 1] = size & 0xff;
3466 if (target_partition == 0)
3467 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3468 bp[pgo + 3] = 1;
3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3471 DEBC_printk(STp,
3472 "Formatting tape with two partitions (%i = %d MB).\n",
3473 target_partition, units > 0 ? size * 1000 : size);
3474 }
3475 bp[pgo + PP_OFF_PART_UNITS] = 0;
3476 bp[pgo + PP_OFF_RESERVED] = 0;
3477 if (size != 1 || units != 0) {
3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3479 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3480 bp[pgo + PP_OFF_PART_UNITS] = units;
3481 } else
3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3485
3486 result = write_mode_page(STp, PART_PAGE, 1);
3487
3488 if (!result && needs_format)
3489 result = format_medium(STp, 1);
3490
3491 if (result) {
3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3493 result = (-EIO);
3494 }
3495
3496 out:
3497 return result;
3498 }
3499 \f
3500
3501
3502 /* The ioctl command */
3503 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3504 {
3505 int i, cmd_nr, cmd_type, bt;
3506 int retval = 0;
3507 unsigned int blk;
3508 struct scsi_tape *STp = file->private_data;
3509 struct st_modedef *STm;
3510 struct st_partstat *STps;
3511 void __user *p = (void __user *)arg;
3512
3513 if (mutex_lock_interruptible(&STp->lock))
3514 return -ERESTARTSYS;
3515
3516 DEB(
3517 if (debugging && !STp->in_use) {
3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3519 retval = (-EIO);
3520 goto out;
3521 } ) /* end DEB */
3522
3523 STm = &(STp->modes[STp->current_mode]);
3524 STps = &(STp->ps[STp->partition]);
3525
3526 /*
3527 * If we are in the middle of error recovery, don't let anyone
3528 * else try and use this device. Also, if error recovery fails, it
3529 * may try and take the device offline, in which case all further
3530 * access to the device is prohibited.
3531 */
3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3533 file->f_flags & O_NDELAY);
3534 if (retval)
3535 goto out;
3536
3537 cmd_type = _IOC_TYPE(cmd_in);
3538 cmd_nr = _IOC_NR(cmd_in);
3539
3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3541 struct mtop mtc;
3542
3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3544 retval = (-EINVAL);
3545 goto out;
3546 }
3547
3548 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3549 if (i) {
3550 retval = (-EFAULT);
3551 goto out;
3552 }
3553
3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3555 st_printk(KERN_WARNING, STp,
3556 "MTSETDRVBUFFER only allowed for root.\n");
3557 retval = (-EPERM);
3558 goto out;
3559 }
3560 if (!STm->defined &&
3561 (mtc.mt_op != MTSETDRVBUFFER &&
3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3563 retval = (-ENXIO);
3564 goto out;
3565 }
3566
3567 if (!STp->pos_unknown) {
3568
3569 if (STps->eof == ST_FM_HIT) {
3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3571 mtc.mt_op == MTEOM) {
3572 mtc.mt_count -= 1;
3573 if (STps->drv_file >= 0)
3574 STps->drv_file += 1;
3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3576 mtc.mt_count += 1;
3577 if (STps->drv_file >= 0)
3578 STps->drv_file += 1;
3579 }
3580 }
3581
3582 if (mtc.mt_op == MTSEEK) {
3583 /* Old position must be restored if partition will be
3584 changed */
3585 i = !STp->can_partitions ||
3586 (STp->new_partition != STp->partition);
3587 } else {
3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3593 mtc.mt_op == MTCOMPRESSION;
3594 }
3595 i = flush_buffer(STp, i);
3596 if (i < 0) {
3597 retval = i;
3598 goto out;
3599 }
3600 if (STps->rw == ST_WRITING &&
3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3602 mtc.mt_op == MTSEEK ||
3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3604 i = st_int_ioctl(STp, MTWEOF, 1);
3605 if (i < 0) {
3606 retval = i;
3607 goto out;
3608 }
3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3610 mtc.mt_count++;
3611 STps->rw = ST_IDLE;
3612 }
3613
3614 } else {
3615 /*
3616 * If there was a bus reset, block further access
3617 * to this device. If the user wants to rewind the tape,
3618 * then reset the flag and allow access again.
3619 */
3620 if (mtc.mt_op != MTREW &&
3621 mtc.mt_op != MTOFFL &&
3622 mtc.mt_op != MTRETEN &&
3623 mtc.mt_op != MTERASE &&
3624 mtc.mt_op != MTSEEK &&
3625 mtc.mt_op != MTEOM) {
3626 retval = (-EIO);
3627 goto out;
3628 }
3629 reset_state(STp);
3630 /* remove this when the midlevel properly clears was_reset */
3631 STp->device->was_reset = 0;
3632 }
3633
3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3638
3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3640 do_door_lock(STp, 0); /* Ignore result! */
3641
3642 if (mtc.mt_op == MTSETDRVBUFFER &&
3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3644 retval = st_set_options(STp, mtc.mt_count);
3645 goto out;
3646 }
3647
3648 if (mtc.mt_op == MTSETPART) {
3649 if (!STp->can_partitions ||
3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3651 retval = (-EINVAL);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions &&
3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3656 retval = (-EIO);
3657 goto out;
3658 }
3659 if (mtc.mt_count >= STp->nbr_partitions) {
3660 retval = (-EINVAL);
3661 goto out;
3662 }
3663 STp->new_partition = mtc.mt_count;
3664 retval = 0;
3665 goto out;
3666 }
3667
3668 if (mtc.mt_op == MTMKPART) {
3669 if (!STp->can_partitions) {
3670 retval = (-EINVAL);
3671 goto out;
3672 }
3673 i = do_load_unload(STp, file, 1);
3674 if (i < 0) {
3675 retval = i;
3676 goto out;
3677 }
3678 i = partition_tape(STp, mtc.mt_count);
3679 if (i < 0) {
3680 retval = i;
3681 goto out;
3682 }
3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3684 STp->ps[i].rw = ST_IDLE;
3685 STp->ps[i].at_sm = 0;
3686 STp->ps[i].last_block_valid = 0;
3687 }
3688 STp->partition = STp->new_partition = 0;
3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3690 STps->drv_block = STps->drv_file = 0;
3691 retval = 0;
3692 goto out;
3693 }
3694
3695 if (mtc.mt_op == MTSEEK) {
3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3697 if (!STp->can_partitions)
3698 STp->ps[0].rw = ST_IDLE;
3699 retval = i;
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3704 retval = do_load_unload(STp, file, 0);
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOAD) {
3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3710 goto out;
3711 }
3712
3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3715 goto out;
3716 }
3717
3718 if (STp->can_partitions && STp->ready == ST_READY &&
3719 (i = switch_partition(STp)) < 0) {
3720 retval = i;
3721 goto out;
3722 }
3723
3724 if (mtc.mt_op == MTCOMPRESSION)
3725 retval = st_compression(STp, (mtc.mt_count & 1));
3726 else
3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3728 goto out;
3729 }
3730 if (!STm->defined) {
3731 retval = (-ENXIO);
3732 goto out;
3733 }
3734
3735 if ((i = flush_buffer(STp, 0)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739 if (STp->can_partitions &&
3740 (i = switch_partition(STp)) < 0) {
3741 retval = i;
3742 goto out;
3743 }
3744
3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3746 struct mtget mt_status;
3747
3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3749 retval = (-EINVAL);
3750 goto out;
3751 }
3752
3753 mt_status.mt_type = STp->tape_type;
3754 mt_status.mt_dsreg =
3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3757 mt_status.mt_blkno = STps->drv_block;
3758 mt_status.mt_fileno = STps->drv_file;
3759 if (STp->block_size != 0) {
3760 if (STps->rw == ST_WRITING)
3761 mt_status.mt_blkno +=
3762 (STp->buffer)->buffer_bytes / STp->block_size;
3763 else if (STps->rw == ST_READING)
3764 mt_status.mt_blkno -=
3765 ((STp->buffer)->buffer_bytes +
3766 STp->block_size - 1) / STp->block_size;
3767 }
3768
3769 mt_status.mt_gstat = 0;
3770 if (STp->drv_write_prot)
3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3772 if (mt_status.mt_blkno == 0) {
3773 if (mt_status.mt_fileno == 0)
3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3775 else
3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3777 }
3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3779 mt_status.mt_resid = STp->partition;
3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3782 else if (STps->eof >= ST_EOM_OK)
3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3784 if (STp->density == 1)
3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3786 else if (STp->density == 2)
3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3788 else if (STp->density == 3)
3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3790 if (STp->ready == ST_READY)
3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3792 if (STp->ready == ST_NO_TAPE)
3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3794 if (STps->at_sm)
3795 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3796 if (STm->do_async_writes ||
3797 (STm->do_buffer_writes && STp->block_size != 0) ||
3798 STp->drv_buffer != 0)
3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3800 if (STp->cleaning_req)
3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3802
3803 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3804 if (i) {
3805 retval = (-EFAULT);
3806 goto out;
3807 }
3808
3809 STp->recover_reg = 0; /* Clear after read */
3810 retval = 0;
3811 goto out;
3812 } /* End of MTIOCGET */
3813 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3814 struct mtpos mt_pos;
3815 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3816 retval = (-EINVAL);
3817 goto out;
3818 }
3819 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3820 retval = i;
3821 goto out;
3822 }
3823 mt_pos.mt_blkno = blk;
3824 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3825 if (i)
3826 retval = (-EFAULT);
3827 goto out;
3828 }
3829 mutex_unlock(&STp->lock);
3830 switch (cmd_in) {
3831 case SCSI_IOCTL_GET_IDLUN:
3832 case SCSI_IOCTL_GET_BUS_NUMBER:
3833 break;
3834 default:
3835 if ((cmd_in == SG_IO ||
3836 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3837 cmd_in == CDROM_SEND_PACKET) &&
3838 !capable(CAP_SYS_RAWIO))
3839 i = -EPERM;
3840 else
3841 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3842 file->f_mode, cmd_in, p);
3843 if (i != -ENOTTY)
3844 return i;
3845 break;
3846 }
3847 retval = scsi_ioctl(STp->device, cmd_in, p);
3848 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3849 STp->rew_at_close = 0;
3850 STp->ready = ST_NO_TAPE;
3851 }
3852 return retval;
3853
3854 out:
3855 mutex_unlock(&STp->lock);
3856 return retval;
3857 }
3858
3859 #ifdef CONFIG_COMPAT
3860 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3861 {
3862 struct scsi_tape *STp = file->private_data;
3863 struct scsi_device *sdev = STp->device;
3864 int ret = -ENOIOCTLCMD;
3865 if (sdev->host->hostt->compat_ioctl) {
3866
3867 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3868
3869 }
3870 return ret;
3871 }
3872 #endif
3873
3874 \f
3875
3876 /* Try to allocate a new tape buffer. Calling function must not hold
3877 dev_arr_lock. */
3878 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3879 {
3880 struct st_buffer *tb;
3881
3882 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3883 if (!tb) {
3884 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3885 return NULL;
3886 }
3887 tb->frp_segs = 0;
3888 tb->use_sg = max_sg;
3889 tb->dma = need_dma;
3890 tb->buffer_size = 0;
3891
3892 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3893 GFP_ATOMIC);
3894 if (!tb->reserved_pages) {
3895 kfree(tb);
3896 return NULL;
3897 }
3898
3899 return tb;
3900 }
3901
3902
3903 /* Try to allocate enough space in the tape buffer */
3904 #define ST_MAX_ORDER 6
3905
3906 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3907 {
3908 int segs, max_segs, b_size, order, got;
3909 gfp_t priority;
3910
3911 if (new_size <= STbuffer->buffer_size)
3912 return 1;
3913
3914 if (STbuffer->buffer_size <= PAGE_SIZE)
3915 normalize_buffer(STbuffer); /* Avoid extra segment */
3916
3917 max_segs = STbuffer->use_sg;
3918
3919 priority = GFP_KERNEL | __GFP_NOWARN;
3920 if (need_dma)
3921 priority |= GFP_DMA;
3922
3923 if (STbuffer->cleared)
3924 priority |= __GFP_ZERO;
3925
3926 if (STbuffer->frp_segs) {
3927 order = STbuffer->reserved_page_order;
3928 b_size = PAGE_SIZE << order;
3929 } else {
3930 for (b_size = PAGE_SIZE, order = 0;
3931 order < ST_MAX_ORDER &&
3932 max_segs * (PAGE_SIZE << order) < new_size;
3933 order++, b_size *= 2)
3934 ; /* empty */
3935 STbuffer->reserved_page_order = order;
3936 }
3937 if (max_segs * (PAGE_SIZE << order) < new_size) {
3938 if (order == ST_MAX_ORDER)
3939 return 0;
3940 normalize_buffer(STbuffer);
3941 return enlarge_buffer(STbuffer, new_size, need_dma);
3942 }
3943
3944 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3945 segs < max_segs && got < new_size;) {
3946 struct page *page;
3947
3948 page = alloc_pages(priority, order);
3949 if (!page) {
3950 DEB(STbuffer->buffer_size = got);
3951 normalize_buffer(STbuffer);
3952 return 0;
3953 }
3954
3955 STbuffer->frp_segs += 1;
3956 got += b_size;
3957 STbuffer->buffer_size = got;
3958 STbuffer->reserved_pages[segs] = page;
3959 segs++;
3960 }
3961 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3962
3963 return 1;
3964 }
3965
3966
3967 /* Make sure that no data from previous user is in the internal buffer */
3968 static void clear_buffer(struct st_buffer * st_bp)
3969 {
3970 int i;
3971
3972 for (i=0; i < st_bp->frp_segs; i++)
3973 memset(page_address(st_bp->reserved_pages[i]), 0,
3974 PAGE_SIZE << st_bp->reserved_page_order);
3975 st_bp->cleared = 1;
3976 }
3977
3978
3979 /* Release the extra buffer */
3980 static void normalize_buffer(struct st_buffer * STbuffer)
3981 {
3982 int i, order = STbuffer->reserved_page_order;
3983
3984 for (i = 0; i < STbuffer->frp_segs; i++) {
3985 __free_pages(STbuffer->reserved_pages[i], order);
3986 STbuffer->buffer_size -= (PAGE_SIZE << order);
3987 }
3988 STbuffer->frp_segs = 0;
3989 STbuffer->sg_segs = 0;
3990 STbuffer->reserved_page_order = 0;
3991 STbuffer->map_data.offset = 0;
3992 }
3993
3994
3995 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3996 negative error code. */
3997 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3998 {
3999 int i, cnt, res, offset;
4000 int length = PAGE_SIZE << st_bp->reserved_page_order;
4001
4002 for (i = 0, offset = st_bp->buffer_bytes;
4003 i < st_bp->frp_segs && offset >= length; i++)
4004 offset -= length;
4005 if (i == st_bp->frp_segs) { /* Should never happen */
4006 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4007 return (-EIO);
4008 }
4009 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4010 struct page *page = st_bp->reserved_pages[i];
4011 cnt = length - offset < do_count ? length - offset : do_count;
4012 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4013 if (res)
4014 return (-EFAULT);
4015 do_count -= cnt;
4016 st_bp->buffer_bytes += cnt;
4017 ubp += cnt;
4018 offset = 0;
4019 }
4020 if (do_count) /* Should never happen */
4021 return (-EIO);
4022
4023 return 0;
4024 }
4025
4026
4027 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4028 negative error code. */
4029 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4030 {
4031 int i, cnt, res, offset;
4032 int length = PAGE_SIZE << st_bp->reserved_page_order;
4033
4034 for (i = 0, offset = st_bp->read_pointer;
4035 i < st_bp->frp_segs && offset >= length; i++)
4036 offset -= length;
4037 if (i == st_bp->frp_segs) { /* Should never happen */
4038 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4039 return (-EIO);
4040 }
4041 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4042 struct page *page = st_bp->reserved_pages[i];
4043 cnt = length - offset < do_count ? length - offset : do_count;
4044 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4045 if (res)
4046 return (-EFAULT);
4047 do_count -= cnt;
4048 st_bp->buffer_bytes -= cnt;
4049 st_bp->read_pointer += cnt;
4050 ubp += cnt;
4051 offset = 0;
4052 }
4053 if (do_count) /* Should never happen */
4054 return (-EIO);
4055
4056 return 0;
4057 }
4058
4059
4060 /* Move data towards start of buffer */
4061 static void move_buffer_data(struct st_buffer * st_bp, int offset)
4062 {
4063 int src_seg, dst_seg, src_offset = 0, dst_offset;
4064 int count, total;
4065 int length = PAGE_SIZE << st_bp->reserved_page_order;
4066
4067 if (offset == 0)
4068 return;
4069
4070 total=st_bp->buffer_bytes - offset;
4071 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4072 src_offset = offset;
4073 if (src_offset < length)
4074 break;
4075 offset -= length;
4076 }
4077
4078 st_bp->buffer_bytes = st_bp->read_pointer = total;
4079 for (dst_seg=dst_offset=0; total > 0; ) {
4080 struct page *dpage = st_bp->reserved_pages[dst_seg];
4081 struct page *spage = st_bp->reserved_pages[src_seg];
4082
4083 count = min(length - dst_offset, length - src_offset);
4084 memmove(page_address(dpage) + dst_offset,
4085 page_address(spage) + src_offset, count);
4086 src_offset += count;
4087 if (src_offset >= length) {
4088 src_seg++;
4089 src_offset = 0;
4090 }
4091 dst_offset += count;
4092 if (dst_offset >= length) {
4093 dst_seg++;
4094 dst_offset = 0;
4095 }
4096 total -= count;
4097 }
4098 }
4099
4100 /* Validate the options from command line or module parameters */
4101 static void validate_options(void)
4102 {
4103 if (buffer_kbs > 0)
4104 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4105 if (max_sg_segs >= ST_FIRST_SG)
4106 st_max_sg_segs = max_sg_segs;
4107 }
4108
4109 #ifndef MODULE
4110 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4111 */
4112 static int __init st_setup(char *str)
4113 {
4114 int i, len, ints[5];
4115 char *stp;
4116
4117 stp = get_options(str, ARRAY_SIZE(ints), ints);
4118
4119 if (ints[0] > 0) {
4120 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4121 if (parms[i].val)
4122 *parms[i].val = ints[i + 1];
4123 } else {
4124 while (stp != NULL) {
4125 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4126 len = strlen(parms[i].name);
4127 if (!strncmp(stp, parms[i].name, len) &&
4128 (*(stp + len) == ':' || *(stp + len) == '=')) {
4129 if (parms[i].val)
4130 *parms[i].val =
4131 simple_strtoul(stp + len + 1, NULL, 0);
4132 else
4133 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4134 parms[i].name);
4135 break;
4136 }
4137 }
4138 if (i >= ARRAY_SIZE(parms))
4139 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4140 stp);
4141 stp = strchr(stp, ',');
4142 if (stp)
4143 stp++;
4144 }
4145 }
4146
4147 validate_options();
4148
4149 return 1;
4150 }
4151
4152 __setup("st=", st_setup);
4153
4154 #endif
4155
4156 static const struct file_operations st_fops =
4157 {
4158 .owner = THIS_MODULE,
4159 .read = st_read,
4160 .write = st_write,
4161 .unlocked_ioctl = st_ioctl,
4162 #ifdef CONFIG_COMPAT
4163 .compat_ioctl = st_compat_ioctl,
4164 #endif
4165 .open = st_open,
4166 .flush = st_flush,
4167 .release = st_release,
4168 .llseek = noop_llseek,
4169 };
4170
4171 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4172 {
4173 int i, error;
4174 dev_t cdev_devno;
4175 struct cdev *cdev;
4176 struct device *dev;
4177 struct st_modedef *STm = &(tape->modes[mode]);
4178 char name[10];
4179 int dev_num = tape->index;
4180
4181 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4182
4183 cdev = cdev_alloc();
4184 if (!cdev) {
4185 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4186 error = -ENOMEM;
4187 goto out;
4188 }
4189 cdev->owner = THIS_MODULE;
4190 cdev->ops = &st_fops;
4191 STm->cdevs[rew] = cdev;
4192
4193 error = cdev_add(cdev, cdev_devno, 1);
4194 if (error) {
4195 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4196 rew ? "non" : "auto", mode);
4197 pr_err("st%d: Device not attached.\n", dev_num);
4198 goto out_free;
4199 }
4200
4201 i = mode << (4 - ST_NBR_MODE_BITS);
4202 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4203 tape->disk->disk_name, st_formats[i]);
4204
4205 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4206 cdev_devno, &tape->modes[mode], "%s", name);
4207 if (IS_ERR(dev)) {
4208 pr_err("st%d: device_create failed\n", dev_num);
4209 error = PTR_ERR(dev);
4210 goto out_free;
4211 }
4212
4213 STm->devs[rew] = dev;
4214
4215 return 0;
4216 out_free:
4217 cdev_del(STm->cdevs[rew]);
4218 out:
4219 STm->cdevs[rew] = NULL;
4220 STm->devs[rew] = NULL;
4221 return error;
4222 }
4223
4224 static int create_cdevs(struct scsi_tape *tape)
4225 {
4226 int mode, error;
4227 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4228 error = create_one_cdev(tape, mode, 0);
4229 if (error)
4230 return error;
4231 error = create_one_cdev(tape, mode, 1);
4232 if (error)
4233 return error;
4234 }
4235
4236 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4237 &tape->modes[0].devs[0]->kobj, "tape");
4238 }
4239
4240 static void remove_cdevs(struct scsi_tape *tape)
4241 {
4242 int mode, rew;
4243 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4244 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4245 struct st_modedef *STm = &(tape->modes[mode]);
4246 for (rew = 0; rew < 2; rew++) {
4247 if (STm->cdevs[rew])
4248 cdev_del(STm->cdevs[rew]);
4249 if (STm->devs[rew])
4250 device_unregister(STm->devs[rew]);
4251 }
4252 }
4253 }
4254
4255 static int st_probe(struct device *dev)
4256 {
4257 struct scsi_device *SDp = to_scsi_device(dev);
4258 struct gendisk *disk = NULL;
4259 struct scsi_tape *tpnt = NULL;
4260 struct st_modedef *STm;
4261 struct st_partstat *STps;
4262 struct st_buffer *buffer;
4263 int i, error;
4264 char *stp;
4265
4266 if (SDp->type != TYPE_TAPE)
4267 return -ENODEV;
4268 if ((stp = st_incompatible(SDp))) {
4269 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4270 sdev_printk(KERN_INFO, SDp,
4271 "st: The suggested driver is %s.\n", stp);
4272 return -ENODEV;
4273 }
4274
4275 scsi_autopm_get_device(SDp);
4276 i = queue_max_segments(SDp->request_queue);
4277 if (st_max_sg_segs < i)
4278 i = st_max_sg_segs;
4279 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4280 if (buffer == NULL) {
4281 sdev_printk(KERN_ERR, SDp,
4282 "st: Can't allocate new tape buffer. "
4283 "Device not attached.\n");
4284 goto out;
4285 }
4286
4287 disk = alloc_disk(1);
4288 if (!disk) {
4289 sdev_printk(KERN_ERR, SDp,
4290 "st: out of memory. Device not attached.\n");
4291 goto out_buffer_free;
4292 }
4293
4294 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4295 if (tpnt == NULL) {
4296 sdev_printk(KERN_ERR, SDp,
4297 "st: Can't allocate device descriptor.\n");
4298 goto out_put_disk;
4299 }
4300 kref_init(&tpnt->kref);
4301 tpnt->disk = disk;
4302 disk->private_data = &tpnt->driver;
4303 disk->queue = SDp->request_queue;
4304 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4305 * take queue reference that release_disk() expects. */
4306 if (!blk_get_queue(disk->queue))
4307 goto out_put_disk;
4308 tpnt->driver = &st_template;
4309
4310 tpnt->device = SDp;
4311 if (SDp->scsi_level <= 2)
4312 tpnt->tape_type = MT_ISSCSI1;
4313 else
4314 tpnt->tape_type = MT_ISSCSI2;
4315
4316 tpnt->buffer = buffer;
4317 tpnt->buffer->last_SRpnt = NULL;
4318
4319 tpnt->inited = 0;
4320 tpnt->dirty = 0;
4321 tpnt->in_use = 0;
4322 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4323 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4324 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4325 tpnt->density = 0;
4326 tpnt->do_auto_lock = ST_AUTO_LOCK;
4327 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4328 tpnt->can_partitions = 0;
4329 tpnt->two_fm = ST_TWO_FM;
4330 tpnt->fast_mteom = ST_FAST_MTEOM;
4331 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4332 tpnt->sili = ST_SILI;
4333 tpnt->immediate = ST_NOWAIT;
4334 tpnt->immediate_filemark = 0;
4335 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4336 tpnt->partition = 0;
4337 tpnt->new_partition = 0;
4338 tpnt->nbr_partitions = 0;
4339 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4340 tpnt->long_timeout = ST_LONG_TIMEOUT;
4341 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4342
4343 for (i = 0; i < ST_NBR_MODES; i++) {
4344 STm = &(tpnt->modes[i]);
4345 STm->defined = 0;
4346 STm->sysv = ST_SYSV;
4347 STm->defaults_for_writes = 0;
4348 STm->do_async_writes = ST_ASYNC_WRITES;
4349 STm->do_buffer_writes = ST_BUFFER_WRITES;
4350 STm->do_read_ahead = ST_READ_AHEAD;
4351 STm->default_compression = ST_DONT_TOUCH;
4352 STm->default_blksize = (-1); /* No forced size */
4353 STm->default_density = (-1); /* No forced density */
4354 STm->tape = tpnt;
4355 }
4356
4357 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4358 STps = &(tpnt->ps[i]);
4359 STps->rw = ST_IDLE;
4360 STps->eof = ST_NOEOF;
4361 STps->at_sm = 0;
4362 STps->last_block_valid = 0;
4363 STps->drv_block = (-1);
4364 STps->drv_file = (-1);
4365 }
4366
4367 tpnt->current_mode = 0;
4368 tpnt->modes[0].defined = 1;
4369
4370 tpnt->density_changed = tpnt->compression_changed =
4371 tpnt->blksize_changed = 0;
4372 mutex_init(&tpnt->lock);
4373
4374 idr_preload(GFP_KERNEL);
4375 spin_lock(&st_index_lock);
4376 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4377 spin_unlock(&st_index_lock);
4378 idr_preload_end();
4379 if (error < 0) {
4380 pr_warn("st: idr allocation failed: %d\n", error);
4381 goto out_put_queue;
4382 }
4383 tpnt->index = error;
4384 sprintf(disk->disk_name, "st%d", tpnt->index);
4385 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4386 if (tpnt->stats == NULL) {
4387 sdev_printk(KERN_ERR, SDp,
4388 "st: Can't allocate statistics.\n");
4389 goto out_idr_remove;
4390 }
4391
4392 dev_set_drvdata(dev, tpnt);
4393
4394
4395 error = create_cdevs(tpnt);
4396 if (error)
4397 goto out_remove_devs;
4398 scsi_autopm_put_device(SDp);
4399
4400 sdev_printk(KERN_NOTICE, SDp,
4401 "Attached scsi tape %s\n", tape_name(tpnt));
4402 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4403 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4404 queue_dma_alignment(SDp->request_queue) + 1);
4405
4406 return 0;
4407
4408 out_remove_devs:
4409 remove_cdevs(tpnt);
4410 kfree(tpnt->stats);
4411 out_idr_remove:
4412 spin_lock(&st_index_lock);
4413 idr_remove(&st_index_idr, tpnt->index);
4414 spin_unlock(&st_index_lock);
4415 out_put_queue:
4416 blk_put_queue(disk->queue);
4417 out_put_disk:
4418 put_disk(disk);
4419 kfree(tpnt);
4420 out_buffer_free:
4421 kfree(buffer);
4422 out:
4423 scsi_autopm_put_device(SDp);
4424 return -ENODEV;
4425 };
4426
4427
4428 static int st_remove(struct device *dev)
4429 {
4430 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4431 int index = tpnt->index;
4432
4433 scsi_autopm_get_device(to_scsi_device(dev));
4434 remove_cdevs(tpnt);
4435
4436 mutex_lock(&st_ref_mutex);
4437 kref_put(&tpnt->kref, scsi_tape_release);
4438 mutex_unlock(&st_ref_mutex);
4439 spin_lock(&st_index_lock);
4440 idr_remove(&st_index_idr, index);
4441 spin_unlock(&st_index_lock);
4442 return 0;
4443 }
4444
4445 /**
4446 * scsi_tape_release - Called to free the Scsi_Tape structure
4447 * @kref: pointer to embedded kref
4448 *
4449 * st_ref_mutex must be held entering this routine. Because it is
4450 * called on last put, you should always use the scsi_tape_get()
4451 * scsi_tape_put() helpers which manipulate the semaphore directly
4452 * and never do a direct kref_put().
4453 **/
4454 static void scsi_tape_release(struct kref *kref)
4455 {
4456 struct scsi_tape *tpnt = to_scsi_tape(kref);
4457 struct gendisk *disk = tpnt->disk;
4458
4459 tpnt->device = NULL;
4460
4461 if (tpnt->buffer) {
4462 normalize_buffer(tpnt->buffer);
4463 kfree(tpnt->buffer->reserved_pages);
4464 kfree(tpnt->buffer);
4465 }
4466
4467 disk->private_data = NULL;
4468 put_disk(disk);
4469 kfree(tpnt->stats);
4470 kfree(tpnt);
4471 return;
4472 }
4473
4474 static struct class st_sysfs_class = {
4475 .name = "scsi_tape",
4476 .dev_groups = st_dev_groups,
4477 };
4478
4479 static int __init init_st(void)
4480 {
4481 int err;
4482
4483 validate_options();
4484
4485 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4486 verstr, st_fixed_buffer_size, st_max_sg_segs);
4487
4488 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4489 if (debugging) {
4490 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4491 debugging);
4492 }
4493
4494 err = class_register(&st_sysfs_class);
4495 if (err) {
4496 pr_err("Unable register sysfs class for SCSI tapes\n");
4497 return err;
4498 }
4499
4500 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4501 ST_MAX_TAPE_ENTRIES, "st");
4502 if (err) {
4503 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4504 SCSI_TAPE_MAJOR);
4505 goto err_class;
4506 }
4507
4508 err = scsi_register_driver(&st_template.gendrv);
4509 if (err)
4510 goto err_chrdev;
4511
4512 return 0;
4513
4514 err_chrdev:
4515 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4516 ST_MAX_TAPE_ENTRIES);
4517 err_class:
4518 class_unregister(&st_sysfs_class);
4519 return err;
4520 }
4521
4522 static void __exit exit_st(void)
4523 {
4524 scsi_unregister_driver(&st_template.gendrv);
4525 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4526 ST_MAX_TAPE_ENTRIES);
4527 class_unregister(&st_sysfs_class);
4528 idr_destroy(&st_index_idr);
4529 printk(KERN_INFO "st: Unloaded.\n");
4530 }
4531
4532 module_init(init_st);
4533 module_exit(exit_st);
4534
4535
4536 /* The sysfs driver interface. Read-only at the moment */
4537 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4538 {
4539 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4540 }
4541 static DRIVER_ATTR_RO(try_direct_io);
4542
4543 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4544 {
4545 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4546 }
4547 static DRIVER_ATTR_RO(fixed_buffer_size);
4548
4549 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4550 {
4551 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4552 }
4553 static DRIVER_ATTR_RO(max_sg_segs);
4554
4555 static ssize_t version_show(struct device_driver *ddd, char *buf)
4556 {
4557 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4558 }
4559 static DRIVER_ATTR_RO(version);
4560
4561 #if DEBUG
4562 static ssize_t debug_flag_store(struct device_driver *ddp,
4563 const char *buf, size_t count)
4564 {
4565 /* We only care what the first byte of the data is the rest is unused.
4566 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4567 * other values have -EINVAL returned if they are passed in.
4568 */
4569 if (count > 0) {
4570 if (buf[0] == '0') {
4571 debugging = NO_DEBUG;
4572 return count;
4573 } else if (buf[0] == '1') {
4574 debugging = 1;
4575 return count;
4576 }
4577 }
4578 return -EINVAL;
4579 }
4580
4581 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4582 {
4583 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4584 }
4585 static DRIVER_ATTR_RW(debug_flag);
4586 #endif
4587
4588 static struct attribute *st_drv_attrs[] = {
4589 &driver_attr_try_direct_io.attr,
4590 &driver_attr_fixed_buffer_size.attr,
4591 &driver_attr_max_sg_segs.attr,
4592 &driver_attr_version.attr,
4593 #if DEBUG
4594 &driver_attr_debug_flag.attr,
4595 #endif
4596 NULL,
4597 };
4598 ATTRIBUTE_GROUPS(st_drv);
4599
4600 /* The sysfs simple class interface */
4601 static ssize_t
4602 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4603 {
4604 struct st_modedef *STm = dev_get_drvdata(dev);
4605 ssize_t l = 0;
4606
4607 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4608 return l;
4609 }
4610 static DEVICE_ATTR_RO(defined);
4611
4612 static ssize_t
4613 default_blksize_show(struct device *dev, struct device_attribute *attr,
4614 char *buf)
4615 {
4616 struct st_modedef *STm = dev_get_drvdata(dev);
4617 ssize_t l = 0;
4618
4619 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4620 return l;
4621 }
4622 static DEVICE_ATTR_RO(default_blksize);
4623
4624 static ssize_t
4625 default_density_show(struct device *dev, struct device_attribute *attr,
4626 char *buf)
4627 {
4628 struct st_modedef *STm = dev_get_drvdata(dev);
4629 ssize_t l = 0;
4630 char *fmt;
4631
4632 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4633 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4634 return l;
4635 }
4636 static DEVICE_ATTR_RO(default_density);
4637
4638 static ssize_t
4639 default_compression_show(struct device *dev, struct device_attribute *attr,
4640 char *buf)
4641 {
4642 struct st_modedef *STm = dev_get_drvdata(dev);
4643 ssize_t l = 0;
4644
4645 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4646 return l;
4647 }
4648 static DEVICE_ATTR_RO(default_compression);
4649
4650 static ssize_t
4651 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4652 {
4653 struct st_modedef *STm = dev_get_drvdata(dev);
4654 struct scsi_tape *STp = STm->tape;
4655 int options;
4656 ssize_t l = 0;
4657
4658 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4659 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4660 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4661 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4662 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4663 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4664 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4665 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4666 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4667 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4668 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4669 options |= STm->sysv ? MT_ST_SYSV : 0;
4670 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4671 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4672 options |= STp->sili ? MT_ST_SILI : 0;
4673
4674 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4675 return l;
4676 }
4677 static DEVICE_ATTR_RO(options);
4678
4679 /* Support for tape stats */
4680
4681 /**
4682 * read_cnt_show - return read count - count of reads made from tape drive
4683 * @dev: struct device
4684 * @attr: attribute structure
4685 * @buf: buffer to return formatted data in
4686 */
4687 static ssize_t read_cnt_show(struct device *dev,
4688 struct device_attribute *attr, char *buf)
4689 {
4690 struct st_modedef *STm = dev_get_drvdata(dev);
4691
4692 return sprintf(buf, "%lld",
4693 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4694 }
4695 static DEVICE_ATTR_RO(read_cnt);
4696
4697 /**
4698 * read_byte_cnt_show - return read byte count - tape drives
4699 * may use blocks less than 512 bytes this gives the raw byte count of
4700 * of data read from the tape drive.
4701 * @dev: struct device
4702 * @attr: attribute structure
4703 * @buf: buffer to return formatted data in
4704 */
4705 static ssize_t read_byte_cnt_show(struct device *dev,
4706 struct device_attribute *attr, char *buf)
4707 {
4708 struct st_modedef *STm = dev_get_drvdata(dev);
4709
4710 return sprintf(buf, "%lld",
4711 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4712 }
4713 static DEVICE_ATTR_RO(read_byte_cnt);
4714
4715 /**
4716 * read_us_show - return read us - overall time spent waiting on reads in ns.
4717 * @dev: struct device
4718 * @attr: attribute structure
4719 * @buf: buffer to return formatted data in
4720 */
4721 static ssize_t read_ns_show(struct device *dev,
4722 struct device_attribute *attr, char *buf)
4723 {
4724 struct st_modedef *STm = dev_get_drvdata(dev);
4725
4726 return sprintf(buf, "%lld",
4727 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4728 }
4729 static DEVICE_ATTR_RO(read_ns);
4730
4731 /**
4732 * write_cnt_show - write count - number of user calls
4733 * to write(2) that have written data to tape.
4734 * @dev: struct device
4735 * @attr: attribute structure
4736 * @buf: buffer to return formatted data in
4737 */
4738 static ssize_t write_cnt_show(struct device *dev,
4739 struct device_attribute *attr, char *buf)
4740 {
4741 struct st_modedef *STm = dev_get_drvdata(dev);
4742
4743 return sprintf(buf, "%lld",
4744 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4745 }
4746 static DEVICE_ATTR_RO(write_cnt);
4747
4748 /**
4749 * write_byte_cnt_show - write byte count - raw count of
4750 * bytes written to tape.
4751 * @dev: struct device
4752 * @attr: attribute structure
4753 * @buf: buffer to return formatted data in
4754 */
4755 static ssize_t write_byte_cnt_show(struct device *dev,
4756 struct device_attribute *attr, char *buf)
4757 {
4758 struct st_modedef *STm = dev_get_drvdata(dev);
4759
4760 return sprintf(buf, "%lld",
4761 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4762 }
4763 static DEVICE_ATTR_RO(write_byte_cnt);
4764
4765 /**
4766 * write_ns_show - write ns - number of nanoseconds waiting on write
4767 * requests to complete.
4768 * @dev: struct device
4769 * @attr: attribute structure
4770 * @buf: buffer to return formatted data in
4771 */
4772 static ssize_t write_ns_show(struct device *dev,
4773 struct device_attribute *attr, char *buf)
4774 {
4775 struct st_modedef *STm = dev_get_drvdata(dev);
4776
4777 return sprintf(buf, "%lld",
4778 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4779 }
4780 static DEVICE_ATTR_RO(write_ns);
4781
4782 /**
4783 * in_flight_show - number of I/Os currently in flight -
4784 * in most cases this will be either 0 or 1. It may be higher if someone
4785 * has also issued other SCSI commands such as via an ioctl.
4786 * @dev: struct device
4787 * @attr: attribute structure
4788 * @buf: buffer to return formatted data in
4789 */
4790 static ssize_t in_flight_show(struct device *dev,
4791 struct device_attribute *attr, char *buf)
4792 {
4793 struct st_modedef *STm = dev_get_drvdata(dev);
4794
4795 return sprintf(buf, "%lld",
4796 (long long)atomic64_read(&STm->tape->stats->in_flight));
4797 }
4798 static DEVICE_ATTR_RO(in_flight);
4799
4800 /**
4801 * io_ns_show - io wait ns - this is the number of ns spent
4802 * waiting on all I/O to complete. This includes tape movement commands
4803 * such as rewinding, seeking to end of file or tape, it also includes
4804 * read and write. To determine the time spent on tape movement
4805 * subtract the read and write ns from this value.
4806 * @dev: struct device
4807 * @attr: attribute structure
4808 * @buf: buffer to return formatted data in
4809 */
4810 static ssize_t io_ns_show(struct device *dev,
4811 struct device_attribute *attr, char *buf)
4812 {
4813 struct st_modedef *STm = dev_get_drvdata(dev);
4814
4815 return sprintf(buf, "%lld",
4816 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4817 }
4818 static DEVICE_ATTR_RO(io_ns);
4819
4820 /**
4821 * other_cnt_show - other io count - this is the number of
4822 * I/O requests other than read and write requests.
4823 * Typically these are tape movement requests but will include driver
4824 * tape movement. This includes only requests issued by the st driver.
4825 * @dev: struct device
4826 * @attr: attribute structure
4827 * @buf: buffer to return formatted data in
4828 */
4829 static ssize_t other_cnt_show(struct device *dev,
4830 struct device_attribute *attr, char *buf)
4831 {
4832 struct st_modedef *STm = dev_get_drvdata(dev);
4833
4834 return sprintf(buf, "%lld",
4835 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4836 }
4837 static DEVICE_ATTR_RO(other_cnt);
4838
4839 /**
4840 * resid_cnt_show - A count of the number of times we get a residual
4841 * count - this should indicate someone issuing reads larger than the
4842 * block size on tape.
4843 * @dev: struct device
4844 * @attr: attribute structure
4845 * @buf: buffer to return formatted data in
4846 */
4847 static ssize_t resid_cnt_show(struct device *dev,
4848 struct device_attribute *attr, char *buf)
4849 {
4850 struct st_modedef *STm = dev_get_drvdata(dev);
4851
4852 return sprintf(buf, "%lld",
4853 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4854 }
4855 static DEVICE_ATTR_RO(resid_cnt);
4856
4857 static struct attribute *st_dev_attrs[] = {
4858 &dev_attr_defined.attr,
4859 &dev_attr_default_blksize.attr,
4860 &dev_attr_default_density.attr,
4861 &dev_attr_default_compression.attr,
4862 &dev_attr_options.attr,
4863 NULL,
4864 };
4865
4866 static struct attribute *st_stats_attrs[] = {
4867 &dev_attr_read_cnt.attr,
4868 &dev_attr_read_byte_cnt.attr,
4869 &dev_attr_read_ns.attr,
4870 &dev_attr_write_cnt.attr,
4871 &dev_attr_write_byte_cnt.attr,
4872 &dev_attr_write_ns.attr,
4873 &dev_attr_in_flight.attr,
4874 &dev_attr_io_ns.attr,
4875 &dev_attr_other_cnt.attr,
4876 &dev_attr_resid_cnt.attr,
4877 NULL,
4878 };
4879
4880 static struct attribute_group stats_group = {
4881 .name = "stats",
4882 .attrs = st_stats_attrs,
4883 };
4884
4885 static struct attribute_group st_group = {
4886 .attrs = st_dev_attrs,
4887 };
4888
4889 static const struct attribute_group *st_dev_groups[] = {
4890 &st_group,
4891 &stats_group,
4892 NULL,
4893 };
4894
4895 /* The following functions may be useful for a larger audience. */
4896 static int sgl_map_user_pages(struct st_buffer *STbp,
4897 const unsigned int max_pages, unsigned long uaddr,
4898 size_t count, int rw)
4899 {
4900 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4901 unsigned long start = uaddr >> PAGE_SHIFT;
4902 const int nr_pages = end - start;
4903 int res, i, j;
4904 struct page **pages;
4905 struct rq_map_data *mdata = &STbp->map_data;
4906
4907 /* User attempted Overflow! */
4908 if ((uaddr + count) < uaddr)
4909 return -EINVAL;
4910
4911 /* Too big */
4912 if (nr_pages > max_pages)
4913 return -ENOMEM;
4914
4915 /* Hmm? */
4916 if (count == 0)
4917 return 0;
4918
4919 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4920 return -ENOMEM;
4921
4922 /* Try to fault in all of the necessary pages */
4923 /* rw==READ means read from drive, write into memory area */
4924 res = get_user_pages_unlocked(
4925 uaddr,
4926 nr_pages,
4927 pages,
4928 rw == READ ? FOLL_WRITE : 0); /* don't force */
4929
4930 /* Errors and no page mapped should return here */
4931 if (res < nr_pages)
4932 goto out_unmap;
4933
4934 for (i=0; i < nr_pages; i++) {
4935 /* FIXME: flush superflous for rw==READ,
4936 * probably wrong function for rw==WRITE
4937 */
4938 flush_dcache_page(pages[i]);
4939 }
4940
4941 mdata->offset = uaddr & ~PAGE_MASK;
4942 STbp->mapped_pages = pages;
4943
4944 return nr_pages;
4945 out_unmap:
4946 if (res > 0) {
4947 for (j=0; j < res; j++)
4948 put_page(pages[j]);
4949 res = 0;
4950 }
4951 kfree(pages);
4952 return res;
4953 }
4954
4955
4956 /* And unmap them... */
4957 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4958 const unsigned int nr_pages, int dirtied)
4959 {
4960 int i;
4961
4962 for (i=0; i < nr_pages; i++) {
4963 struct page *page = STbp->mapped_pages[i];
4964
4965 if (dirtied)
4966 SetPageDirty(page);
4967 /* FIXME: cache flush missing for rw==READ
4968 * FIXME: call the correct reference counting function
4969 */
4970 put_page(page);
4971 }
4972 kfree(STbp->mapped_pages);
4973 STbp->mapped_pages = NULL;
4974
4975 return 0;
4976 }
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