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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / drivers / scsi / st.c
blob307df2fa39a3821a378dc8f96a8796b79032c8d2
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, blk_status_t status)
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, 0);
549 if (IS_ERR(req))
550 return DRIVER_ERROR << 24;
551 rq = scsi_req(req);
552 req->rq_flags |= RQF_QUIET;
553
554 mdata->null_mapped = 1;
555
556 if (bufflen) {
557 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
558 GFP_KERNEL);
559 if (err) {
560 blk_put_request(req);
561 return DRIVER_ERROR << 24;
562 }
563 }
564
565 atomic64_inc(&STp->stats->in_flight);
566 if (cmd[0] == WRITE_6) {
567 atomic_set(&STp->stats->last_write_size, bufflen);
568 STp->stats->write_time = ktime_get();
569 } else if (cmd[0] == READ_6) {
570 atomic_set(&STp->stats->last_read_size, bufflen);
571 STp->stats->read_time = ktime_get();
572 } else {
573 STp->stats->other_time = ktime_get();
574 }
575
576 SRpnt->bio = req->bio;
577 rq->cmd_len = COMMAND_SIZE(cmd[0]);
578 memset(rq->cmd, 0, BLK_MAX_CDB);
579 memcpy(rq->cmd, cmd, rq->cmd_len);
580 req->timeout = timeout;
581 rq->retries = retries;
582 req->end_io_data = SRpnt;
583
584 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
585 return 0;
586 }
587
588 /* Do the scsi command. Waits until command performed if do_wait is true.
589 Otherwise write_behind_check() is used to check that the command
590 has finished. */
591 static struct st_request *
592 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
593 int bytes, int direction, int timeout, int retries, int do_wait)
594 {
595 struct completion *waiting;
596 struct rq_map_data *mdata = &STp->buffer->map_data;
597 int ret;
598
599 /* if async, make sure there's no command outstanding */
600 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
601 st_printk(KERN_ERR, STp,
602 "Async command already active.\n");
603 if (signal_pending(current))
604 (STp->buffer)->syscall_result = (-EINTR);
605 else
606 (STp->buffer)->syscall_result = (-EBUSY);
607 return NULL;
608 }
609
610 if (!SRpnt) {
611 SRpnt = st_allocate_request(STp);
612 if (!SRpnt)
613 return NULL;
614 }
615
616 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
617 which IO is outstanding. It's nulled out when the IO completes. */
618 if (!do_wait)
619 (STp->buffer)->last_SRpnt = SRpnt;
620
621 waiting = &STp->wait;
622 init_completion(waiting);
623 SRpnt->waiting = waiting;
624
625 if (STp->buffer->do_dio) {
626 mdata->page_order = 0;
627 mdata->nr_entries = STp->buffer->sg_segs;
628 mdata->pages = STp->buffer->mapped_pages;
629 } else {
630 mdata->page_order = STp->buffer->reserved_page_order;
631 mdata->nr_entries =
632 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
633 mdata->pages = STp->buffer->reserved_pages;
634 mdata->offset = 0;
635 }
636
637 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
638 STp->buffer->cmdstat.have_sense = 0;
639 STp->buffer->syscall_result = 0;
640
641 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
642 retries);
643 if (ret) {
644 /* could not allocate the buffer or request was too large */
645 (STp->buffer)->syscall_result = (-EBUSY);
646 (STp->buffer)->last_SRpnt = NULL;
647 } else if (do_wait) {
648 wait_for_completion(waiting);
649 SRpnt->waiting = NULL;
650 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
651 }
652
653 return SRpnt;
654 }
655
656
657 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
658 write has been correct but EOM early warning reached, -EIO if write ended in
659 error or zero if write successful. Asynchronous writes are used only in
660 variable block mode. */
661 static int write_behind_check(struct scsi_tape * STp)
662 {
663 int retval = 0;
664 struct st_buffer *STbuffer;
665 struct st_partstat *STps;
666 struct st_cmdstatus *cmdstatp;
667 struct st_request *SRpnt;
668
669 STbuffer = STp->buffer;
670 if (!STbuffer->writing)
671 return 0;
672
673 DEB(
674 if (STp->write_pending)
675 STp->nbr_waits++;
676 else
677 STp->nbr_finished++;
678 ) /* end DEB */
679
680 wait_for_completion(&(STp->wait));
681 SRpnt = STbuffer->last_SRpnt;
682 STbuffer->last_SRpnt = NULL;
683 SRpnt->waiting = NULL;
684
685 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
686 st_release_request(SRpnt);
687
688 STbuffer->buffer_bytes -= STbuffer->writing;
689 STps = &(STp->ps[STp->partition]);
690 if (STps->drv_block >= 0) {
691 if (STp->block_size == 0)
692 STps->drv_block++;
693 else
694 STps->drv_block += STbuffer->writing / STp->block_size;
695 }
696
697 cmdstatp = &STbuffer->cmdstat;
698 if (STbuffer->syscall_result) {
699 retval = -EIO;
700 if (cmdstatp->have_sense && !cmdstatp->deferred &&
701 (cmdstatp->flags & SENSE_EOM) &&
702 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
703 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
704 /* EOM at write-behind, has all data been written? */
705 if (!cmdstatp->remainder_valid ||
706 cmdstatp->uremainder64 == 0)
707 retval = -ENOSPC;
708 }
709 if (retval == -EIO)
710 STps->drv_block = -1;
711 }
712 STbuffer->writing = 0;
713
714 DEB(if (debugging && retval)
715 st_printk(ST_DEB_MSG, STp,
716 "Async write error %x, return value %d.\n",
717 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
718
719 return retval;
720 }
721
722
723 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
724 it messes up the block number). */
725 static int cross_eof(struct scsi_tape * STp, int forward)
726 {
727 struct st_request *SRpnt;
728 unsigned char cmd[MAX_COMMAND_SIZE];
729
730 cmd[0] = SPACE;
731 cmd[1] = 0x01; /* Space FileMarks */
732 if (forward) {
733 cmd[2] = cmd[3] = 0;
734 cmd[4] = 1;
735 } else
736 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
737 cmd[5] = 0;
738
739 DEBC_printk(STp, "Stepping over filemark %s.\n",
740 forward ? "forward" : "backward");
741
742 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
743 STp->device->request_queue->rq_timeout,
744 MAX_RETRIES, 1);
745 if (!SRpnt)
746 return (STp->buffer)->syscall_result;
747
748 st_release_request(SRpnt);
749 SRpnt = NULL;
750
751 if ((STp->buffer)->cmdstat.midlevel_result != 0)
752 st_printk(KERN_ERR, STp,
753 "Stepping over filemark %s failed.\n",
754 forward ? "forward" : "backward");
755
756 return (STp->buffer)->syscall_result;
757 }
758
759
760 /* Flush the write buffer (never need to write if variable blocksize). */
761 static int st_flush_write_buffer(struct scsi_tape * STp)
762 {
763 int transfer, blks;
764 int result;
765 unsigned char cmd[MAX_COMMAND_SIZE];
766 struct st_request *SRpnt;
767 struct st_partstat *STps;
768
769 result = write_behind_check(STp);
770 if (result)
771 return result;
772
773 result = 0;
774 if (STp->dirty == 1) {
775
776 transfer = STp->buffer->buffer_bytes;
777 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
778
779 memset(cmd, 0, MAX_COMMAND_SIZE);
780 cmd[0] = WRITE_6;
781 cmd[1] = 1;
782 blks = transfer / STp->block_size;
783 cmd[2] = blks >> 16;
784 cmd[3] = blks >> 8;
785 cmd[4] = blks;
786
787 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
788 STp->device->request_queue->rq_timeout,
789 MAX_WRITE_RETRIES, 1);
790 if (!SRpnt)
791 return (STp->buffer)->syscall_result;
792
793 STps = &(STp->ps[STp->partition]);
794 if ((STp->buffer)->syscall_result != 0) {
795 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
796
797 if (cmdstatp->have_sense && !cmdstatp->deferred &&
798 (cmdstatp->flags & SENSE_EOM) &&
799 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
800 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
801 (!cmdstatp->remainder_valid ||
802 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
803 STp->dirty = 0;
804 (STp->buffer)->buffer_bytes = 0;
805 if (STps->drv_block >= 0)
806 STps->drv_block += blks;
807 result = (-ENOSPC);
808 } else {
809 st_printk(KERN_ERR, STp, "Error on flush.\n");
810 STps->drv_block = (-1);
811 result = (-EIO);
812 }
813 } else {
814 if (STps->drv_block >= 0)
815 STps->drv_block += blks;
816 STp->dirty = 0;
817 (STp->buffer)->buffer_bytes = 0;
818 }
819 st_release_request(SRpnt);
820 SRpnt = NULL;
821 }
822 return result;
823 }
824
825
826 /* Flush the tape buffer. The tape will be positioned correctly unless
827 seek_next is true. */
828 static int flush_buffer(struct scsi_tape *STp, int seek_next)
829 {
830 int backspace, result;
831 struct st_partstat *STps;
832
833 /*
834 * If there was a bus reset, block further access
835 * to this device.
836 */
837 if (STp->pos_unknown)
838 return (-EIO);
839
840 if (STp->ready != ST_READY)
841 return 0;
842 STps = &(STp->ps[STp->partition]);
843 if (STps->rw == ST_WRITING) /* Writing */
844 return st_flush_write_buffer(STp);
845
846 if (STp->block_size == 0)
847 return 0;
848
849 backspace = ((STp->buffer)->buffer_bytes +
850 (STp->buffer)->read_pointer) / STp->block_size -
851 ((STp->buffer)->read_pointer + STp->block_size - 1) /
852 STp->block_size;
853 (STp->buffer)->buffer_bytes = 0;
854 (STp->buffer)->read_pointer = 0;
855 result = 0;
856 if (!seek_next) {
857 if (STps->eof == ST_FM_HIT) {
858 result = cross_eof(STp, 0); /* Back over the EOF hit */
859 if (!result)
860 STps->eof = ST_NOEOF;
861 else {
862 if (STps->drv_file >= 0)
863 STps->drv_file++;
864 STps->drv_block = 0;
865 }
866 }
867 if (!result && backspace > 0)
868 result = st_int_ioctl(STp, MTBSR, backspace);
869 } else if (STps->eof == ST_FM_HIT) {
870 if (STps->drv_file >= 0)
871 STps->drv_file++;
872 STps->drv_block = 0;
873 STps->eof = ST_NOEOF;
874 }
875 return result;
876
877 }
878 \f
879 /* Set the mode parameters */
880 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
881 {
882 int set_it = 0;
883 unsigned long arg;
884
885 if (!STp->density_changed &&
886 STm->default_density >= 0 &&
887 STm->default_density != STp->density) {
888 arg = STm->default_density;
889 set_it = 1;
890 } else
891 arg = STp->density;
892 arg <<= MT_ST_DENSITY_SHIFT;
893 if (!STp->blksize_changed &&
894 STm->default_blksize >= 0 &&
895 STm->default_blksize != STp->block_size) {
896 arg |= STm->default_blksize;
897 set_it = 1;
898 } else
899 arg |= STp->block_size;
900 if (set_it &&
901 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
902 st_printk(KERN_WARNING, STp,
903 "Can't set default block size to %d bytes "
904 "and density %x.\n",
905 STm->default_blksize, STm->default_density);
906 if (modes_defined)
907 return (-EINVAL);
908 }
909 return 0;
910 }
911
912
913 /* Lock or unlock the drive door. Don't use when st_request allocated. */
914 static int do_door_lock(struct scsi_tape * STp, int do_lock)
915 {
916 int retval;
917
918 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
919
920 retval = scsi_set_medium_removal(STp->device,
921 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
922 if (!retval)
923 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
924 else
925 STp->door_locked = ST_LOCK_FAILS;
926 return retval;
927 }
928
929
930 /* Set the internal state after reset */
931 static void reset_state(struct scsi_tape *STp)
932 {
933 int i;
934 struct st_partstat *STps;
935
936 STp->pos_unknown = 0;
937 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
938 STps = &(STp->ps[i]);
939 STps->rw = ST_IDLE;
940 STps->eof = ST_NOEOF;
941 STps->at_sm = 0;
942 STps->last_block_valid = 0;
943 STps->drv_block = -1;
944 STps->drv_file = -1;
945 }
946 if (STp->can_partitions) {
947 STp->partition = find_partition(STp);
948 if (STp->partition < 0)
949 STp->partition = 0;
950 STp->new_partition = STp->partition;
951 }
952 }
953 \f
954 /* Test if the drive is ready. Returns either one of the codes below or a negative system
955 error code. */
956 #define CHKRES_READY 0
957 #define CHKRES_NEW_SESSION 1
958 #define CHKRES_NOT_READY 2
959 #define CHKRES_NO_TAPE 3
960
961 #define MAX_ATTENTIONS 10
962
963 static int test_ready(struct scsi_tape *STp, int do_wait)
964 {
965 int attentions, waits, max_wait, scode;
966 int retval = CHKRES_READY, new_session = 0;
967 unsigned char cmd[MAX_COMMAND_SIZE];
968 struct st_request *SRpnt = NULL;
969 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
970
971 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
972
973 for (attentions=waits=0; ; ) {
974 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
975 cmd[0] = TEST_UNIT_READY;
976 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
977 STp->long_timeout, MAX_READY_RETRIES, 1);
978
979 if (!SRpnt) {
980 retval = (STp->buffer)->syscall_result;
981 break;
982 }
983
984 if (cmdstatp->have_sense) {
985
986 scode = cmdstatp->sense_hdr.sense_key;
987
988 if (scode == UNIT_ATTENTION) { /* New media? */
989 new_session = 1;
990 if (attentions < MAX_ATTENTIONS) {
991 attentions++;
992 continue;
993 }
994 else {
995 retval = (-EIO);
996 break;
997 }
998 }
999
1000 if (scode == NOT_READY) {
1001 if (waits < max_wait) {
1002 if (msleep_interruptible(1000)) {
1003 retval = (-EINTR);
1004 break;
1005 }
1006 waits++;
1007 continue;
1008 }
1009 else {
1010 if ((STp->device)->scsi_level >= SCSI_2 &&
1011 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1012 retval = CHKRES_NO_TAPE;
1013 else
1014 retval = CHKRES_NOT_READY;
1015 break;
1016 }
1017 }
1018 }
1019
1020 retval = (STp->buffer)->syscall_result;
1021 if (!retval)
1022 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1023 break;
1024 }
1025
1026 if (SRpnt != NULL)
1027 st_release_request(SRpnt);
1028 return retval;
1029 }
1030
1031
1032 /* See if the drive is ready and gather information about the tape. Return values:
1033 < 0 negative error code from errno.h
1034 0 drive ready
1035 1 drive not ready (possibly no tape)
1036 */
1037 static int check_tape(struct scsi_tape *STp, struct file *filp)
1038 {
1039 int i, retval, new_session = 0, do_wait;
1040 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1041 unsigned short st_flags = filp->f_flags;
1042 struct st_request *SRpnt = NULL;
1043 struct st_modedef *STm;
1044 struct st_partstat *STps;
1045 struct inode *inode = file_inode(filp);
1046 int mode = TAPE_MODE(inode);
1047
1048 STp->ready = ST_READY;
1049
1050 if (mode != STp->current_mode) {
1051 DEBC_printk(STp, "Mode change from %d to %d.\n",
1052 STp->current_mode, mode);
1053 new_session = 1;
1054 STp->current_mode = mode;
1055 }
1056 STm = &(STp->modes[STp->current_mode]);
1057
1058 saved_cleaning = STp->cleaning_req;
1059 STp->cleaning_req = 0;
1060
1061 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1062 retval = test_ready(STp, do_wait);
1063
1064 if (retval < 0)
1065 goto err_out;
1066
1067 if (retval == CHKRES_NEW_SESSION) {
1068 STp->pos_unknown = 0;
1069 STp->partition = STp->new_partition = 0;
1070 if (STp->can_partitions)
1071 STp->nbr_partitions = 1; /* This guess will be updated later
1072 if necessary */
1073 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1074 STps = &(STp->ps[i]);
1075 STps->rw = ST_IDLE;
1076 STps->eof = ST_NOEOF;
1077 STps->at_sm = 0;
1078 STps->last_block_valid = 0;
1079 STps->drv_block = 0;
1080 STps->drv_file = 0;
1081 }
1082 new_session = 1;
1083 }
1084 else {
1085 STp->cleaning_req |= saved_cleaning;
1086
1087 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1088 if (retval == CHKRES_NO_TAPE)
1089 STp->ready = ST_NO_TAPE;
1090 else
1091 STp->ready = ST_NOT_READY;
1092
1093 STp->density = 0; /* Clear the erroneous "residue" */
1094 STp->write_prot = 0;
1095 STp->block_size = 0;
1096 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1097 STp->partition = STp->new_partition = 0;
1098 STp->door_locked = ST_UNLOCKED;
1099 return CHKRES_NOT_READY;
1100 }
1101 }
1102
1103 if (STp->omit_blklims)
1104 STp->min_block = STp->max_block = (-1);
1105 else {
1106 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1107 cmd[0] = READ_BLOCK_LIMITS;
1108
1109 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1110 STp->device->request_queue->rq_timeout,
1111 MAX_READY_RETRIES, 1);
1112 if (!SRpnt) {
1113 retval = (STp->buffer)->syscall_result;
1114 goto err_out;
1115 }
1116
1117 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1118 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1119 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1120 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1121 (STp->buffer)->b_data[5];
1122 if ( DEB( debugging || ) !STp->inited)
1123 st_printk(KERN_INFO, STp,
1124 "Block limits %d - %d bytes.\n",
1125 STp->min_block, STp->max_block);
1126 } else {
1127 STp->min_block = STp->max_block = (-1);
1128 DEBC_printk(STp, "Can't read block limits.\n");
1129 }
1130 }
1131
1132 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1133 cmd[0] = MODE_SENSE;
1134 cmd[4] = 12;
1135
1136 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1137 STp->device->request_queue->rq_timeout,
1138 MAX_READY_RETRIES, 1);
1139 if (!SRpnt) {
1140 retval = (STp->buffer)->syscall_result;
1141 goto err_out;
1142 }
1143
1144 if ((STp->buffer)->syscall_result != 0) {
1145 DEBC_printk(STp, "No Mode Sense.\n");
1146 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1147 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1148 STp->drv_write_prot = 0;
1149 } else {
1150 DEBC_printk(STp,"Mode sense. Length %d, "
1151 "medium %x, WBS %x, BLL %d\n",
1152 (STp->buffer)->b_data[0],
1153 (STp->buffer)->b_data[1],
1154 (STp->buffer)->b_data[2],
1155 (STp->buffer)->b_data[3]);
1156
1157 if ((STp->buffer)->b_data[3] >= 8) {
1158 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1159 STp->density = (STp->buffer)->b_data[4];
1160 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1161 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1162 DEBC_printk(STp, "Density %x, tape length: %x, "
1163 "drv buffer: %d\n",
1164 STp->density,
1165 (STp->buffer)->b_data[5] * 65536 +
1166 (STp->buffer)->b_data[6] * 256 +
1167 (STp->buffer)->b_data[7],
1168 STp->drv_buffer);
1169 }
1170 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1171 if (!STp->drv_buffer && STp->immediate_filemark) {
1172 st_printk(KERN_WARNING, STp,
1173 "non-buffered tape: disabling "
1174 "writing immediate filemarks\n");
1175 STp->immediate_filemark = 0;
1176 }
1177 }
1178 st_release_request(SRpnt);
1179 SRpnt = NULL;
1180 STp->inited = 1;
1181
1182 if (STp->block_size > 0)
1183 (STp->buffer)->buffer_blocks =
1184 (STp->buffer)->buffer_size / STp->block_size;
1185 else
1186 (STp->buffer)->buffer_blocks = 1;
1187 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1188
1189 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1190 STp->block_size, (STp->buffer)->buffer_size,
1191 (STp->buffer)->buffer_blocks);
1192
1193 if (STp->drv_write_prot) {
1194 STp->write_prot = 1;
1195
1196 DEBC_printk(STp, "Write protected\n");
1197
1198 if (do_wait &&
1199 ((st_flags & O_ACCMODE) == O_WRONLY ||
1200 (st_flags & O_ACCMODE) == O_RDWR)) {
1201 retval = (-EROFS);
1202 goto err_out;
1203 }
1204 }
1205
1206 if (STp->can_partitions && STp->nbr_partitions < 1) {
1207 /* This code is reached when the device is opened for the first time
1208 after the driver has been initialized with tape in the drive and the
1209 partition support has been enabled. */
1210 DEBC_printk(STp, "Updating partition number in status.\n");
1211 if ((STp->partition = find_partition(STp)) < 0) {
1212 retval = STp->partition;
1213 goto err_out;
1214 }
1215 STp->new_partition = STp->partition;
1216 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1217 }
1218
1219 if (new_session) { /* Change the drive parameters for the new mode */
1220 STp->density_changed = STp->blksize_changed = 0;
1221 STp->compression_changed = 0;
1222 if (!(STm->defaults_for_writes) &&
1223 (retval = set_mode_densblk(STp, STm)) < 0)
1224 goto err_out;
1225
1226 if (STp->default_drvbuffer != 0xff) {
1227 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1228 st_printk(KERN_WARNING, STp,
1229 "Can't set default drive "
1230 "buffering to %d.\n",
1231 STp->default_drvbuffer);
1232 }
1233 }
1234
1235 return CHKRES_READY;
1236
1237 err_out:
1238 return retval;
1239 }
1240
1241
1242 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1243 module count. */
1244 static int st_open(struct inode *inode, struct file *filp)
1245 {
1246 int i, retval = (-EIO);
1247 int resumed = 0;
1248 struct scsi_tape *STp;
1249 struct st_partstat *STps;
1250 int dev = TAPE_NR(inode);
1251
1252 /*
1253 * We really want to do nonseekable_open(inode, filp); here, but some
1254 * versions of tar incorrectly call lseek on tapes and bail out if that
1255 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1256 */
1257 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1258
1259 if (!(STp = scsi_tape_get(dev))) {
1260 return -ENXIO;
1261 }
1262
1263 filp->private_data = STp;
1264
1265 spin_lock(&st_use_lock);
1266 if (STp->in_use) {
1267 spin_unlock(&st_use_lock);
1268 scsi_tape_put(STp);
1269 DEBC_printk(STp, "Device already in use.\n");
1270 return (-EBUSY);
1271 }
1272
1273 STp->in_use = 1;
1274 spin_unlock(&st_use_lock);
1275 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1276
1277 if (scsi_autopm_get_device(STp->device) < 0) {
1278 retval = -EIO;
1279 goto err_out;
1280 }
1281 resumed = 1;
1282 if (!scsi_block_when_processing_errors(STp->device)) {
1283 retval = (-ENXIO);
1284 goto err_out;
1285 }
1286
1287 /* See that we have at least a one page buffer available */
1288 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1289 st_printk(KERN_WARNING, STp,
1290 "Can't allocate one page tape buffer.\n");
1291 retval = (-EOVERFLOW);
1292 goto err_out;
1293 }
1294
1295 (STp->buffer)->cleared = 0;
1296 (STp->buffer)->writing = 0;
1297 (STp->buffer)->syscall_result = 0;
1298
1299 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1300
1301 STp->dirty = 0;
1302 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1303 STps = &(STp->ps[i]);
1304 STps->rw = ST_IDLE;
1305 }
1306 STp->try_dio_now = STp->try_dio;
1307 STp->recover_count = 0;
1308 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1309 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1310
1311 retval = check_tape(STp, filp);
1312 if (retval < 0)
1313 goto err_out;
1314 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1315 retval != CHKRES_READY) {
1316 if (STp->ready == NO_TAPE)
1317 retval = (-ENOMEDIUM);
1318 else
1319 retval = (-EIO);
1320 goto err_out;
1321 }
1322 return 0;
1323
1324 err_out:
1325 normalize_buffer(STp->buffer);
1326 spin_lock(&st_use_lock);
1327 STp->in_use = 0;
1328 spin_unlock(&st_use_lock);
1329 if (resumed)
1330 scsi_autopm_put_device(STp->device);
1331 scsi_tape_put(STp);
1332 return retval;
1333
1334 }
1335 \f
1336
1337 /* Flush the tape buffer before close */
1338 static int st_flush(struct file *filp, fl_owner_t id)
1339 {
1340 int result = 0, result2;
1341 unsigned char cmd[MAX_COMMAND_SIZE];
1342 struct st_request *SRpnt;
1343 struct scsi_tape *STp = filp->private_data;
1344 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1345 struct st_partstat *STps = &(STp->ps[STp->partition]);
1346
1347 if (file_count(filp) > 1)
1348 return 0;
1349
1350 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1351 result = st_flush_write_buffer(STp);
1352 if (result != 0 && result != (-ENOSPC))
1353 goto out;
1354 }
1355
1356 if (STp->can_partitions &&
1357 (result2 = switch_partition(STp)) < 0) {
1358 DEBC_printk(STp, "switch_partition at close failed.\n");
1359 if (result == 0)
1360 result = result2;
1361 goto out;
1362 }
1363
1364 DEBC( if (STp->nbr_requests)
1365 st_printk(KERN_DEBUG, STp,
1366 "Number of r/w requests %d, dio used in %d, "
1367 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1368 STp->nbr_pages));
1369
1370 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1371 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1372
1373 #if DEBUG
1374 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1375 STp->nbr_waits, STp->nbr_finished);
1376 #endif
1377 memset(cmd, 0, MAX_COMMAND_SIZE);
1378 cmd[0] = WRITE_FILEMARKS;
1379 if (STp->immediate_filemark)
1380 cmd[1] = 1;
1381 cmd[4] = 1 + STp->two_fm;
1382
1383 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1384 STp->device->request_queue->rq_timeout,
1385 MAX_WRITE_RETRIES, 1);
1386 if (!SRpnt) {
1387 result = (STp->buffer)->syscall_result;
1388 goto out;
1389 }
1390
1391 if (STp->buffer->syscall_result == 0 ||
1392 (cmdstatp->have_sense && !cmdstatp->deferred &&
1393 (cmdstatp->flags & SENSE_EOM) &&
1394 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1395 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1396 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1397 /* Write successful at EOM */
1398 st_release_request(SRpnt);
1399 SRpnt = NULL;
1400 if (STps->drv_file >= 0)
1401 STps->drv_file++;
1402 STps->drv_block = 0;
1403 if (STp->two_fm)
1404 cross_eof(STp, 0);
1405 STps->eof = ST_FM;
1406 }
1407 else { /* Write error */
1408 st_release_request(SRpnt);
1409 SRpnt = NULL;
1410 st_printk(KERN_ERR, STp,
1411 "Error on write filemark.\n");
1412 if (result == 0)
1413 result = (-EIO);
1414 }
1415
1416 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1417 } else if (!STp->rew_at_close) {
1418 STps = &(STp->ps[STp->partition]);
1419 if (!STm->sysv || STps->rw != ST_READING) {
1420 if (STp->can_bsr)
1421 result = flush_buffer(STp, 0);
1422 else if (STps->eof == ST_FM_HIT) {
1423 result = cross_eof(STp, 0);
1424 if (result) {
1425 if (STps->drv_file >= 0)
1426 STps->drv_file++;
1427 STps->drv_block = 0;
1428 STps->eof = ST_FM;
1429 } else
1430 STps->eof = ST_NOEOF;
1431 }
1432 } else if ((STps->eof == ST_NOEOF &&
1433 !(result = cross_eof(STp, 1))) ||
1434 STps->eof == ST_FM_HIT) {
1435 if (STps->drv_file >= 0)
1436 STps->drv_file++;
1437 STps->drv_block = 0;
1438 STps->eof = ST_FM;
1439 }
1440 }
1441
1442 out:
1443 if (STp->rew_at_close) {
1444 result2 = st_int_ioctl(STp, MTREW, 1);
1445 if (result == 0)
1446 result = result2;
1447 }
1448 return result;
1449 }
1450
1451
1452 /* Close the device and release it. BKL is not needed: this is the only thread
1453 accessing this tape. */
1454 static int st_release(struct inode *inode, struct file *filp)
1455 {
1456 int result = 0;
1457 struct scsi_tape *STp = filp->private_data;
1458
1459 if (STp->door_locked == ST_LOCKED_AUTO)
1460 do_door_lock(STp, 0);
1461
1462 normalize_buffer(STp->buffer);
1463 spin_lock(&st_use_lock);
1464 STp->in_use = 0;
1465 spin_unlock(&st_use_lock);
1466 scsi_autopm_put_device(STp->device);
1467 scsi_tape_put(STp);
1468
1469 return result;
1470 }
1471 \f
1472 /* The checks common to both reading and writing */
1473 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1474 {
1475 ssize_t retval = 0;
1476
1477 /*
1478 * If we are in the middle of error recovery, don't let anyone
1479 * else try and use this device. Also, if error recovery fails, it
1480 * may try and take the device offline, in which case all further
1481 * access to the device is prohibited.
1482 */
1483 if (!scsi_block_when_processing_errors(STp->device)) {
1484 retval = (-ENXIO);
1485 goto out;
1486 }
1487
1488 if (STp->ready != ST_READY) {
1489 if (STp->ready == ST_NO_TAPE)
1490 retval = (-ENOMEDIUM);
1491 else
1492 retval = (-EIO);
1493 goto out;
1494 }
1495
1496 if (! STp->modes[STp->current_mode].defined) {
1497 retval = (-ENXIO);
1498 goto out;
1499 }
1500
1501
1502 /*
1503 * If there was a bus reset, block further access
1504 * to this device.
1505 */
1506 if (STp->pos_unknown) {
1507 retval = (-EIO);
1508 goto out;
1509 }
1510
1511 if (count == 0)
1512 goto out;
1513
1514 DEB(
1515 if (!STp->in_use) {
1516 st_printk(ST_DEB_MSG, STp,
1517 "Incorrect device.\n");
1518 retval = (-EIO);
1519 goto out;
1520 } ) /* end DEB */
1521
1522 if (STp->can_partitions &&
1523 (retval = switch_partition(STp)) < 0)
1524 goto out;
1525
1526 if (STp->block_size == 0 && STp->max_block > 0 &&
1527 (count < STp->min_block || count > STp->max_block)) {
1528 retval = (-EINVAL);
1529 goto out;
1530 }
1531
1532 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1533 !do_door_lock(STp, 1))
1534 STp->door_locked = ST_LOCKED_AUTO;
1535
1536 out:
1537 return retval;
1538 }
1539
1540
1541 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1542 size_t count, int is_read)
1543 {
1544 int i, bufsize, retval = 0;
1545 struct st_buffer *STbp = STp->buffer;
1546
1547 if (is_read)
1548 i = STp->try_dio_now && try_rdio;
1549 else
1550 i = STp->try_dio_now && try_wdio;
1551
1552 if (i && ((unsigned long)buf & queue_dma_alignment(
1553 STp->device->request_queue)) == 0) {
1554 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1555 count, (is_read ? READ : WRITE));
1556 if (i > 0) {
1557 STbp->do_dio = i;
1558 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1559 }
1560 else
1561 STbp->do_dio = 0; /* fall back to buffering with any error */
1562 STbp->sg_segs = STbp->do_dio;
1563 DEB(
1564 if (STbp->do_dio) {
1565 STp->nbr_dio++;
1566 STp->nbr_pages += STbp->do_dio;
1567 }
1568 )
1569 } else
1570 STbp->do_dio = 0;
1571 DEB( STp->nbr_requests++; )
1572
1573 if (!STbp->do_dio) {
1574 if (STp->block_size)
1575 bufsize = STp->block_size > st_fixed_buffer_size ?
1576 STp->block_size : st_fixed_buffer_size;
1577 else {
1578 bufsize = count;
1579 /* Make sure that data from previous user is not leaked even if
1580 HBA does not return correct residual */
1581 if (is_read && STp->sili && !STbp->cleared)
1582 clear_buffer(STbp);
1583 }
1584
1585 if (bufsize > STbp->buffer_size &&
1586 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1587 st_printk(KERN_WARNING, STp,
1588 "Can't allocate %d byte tape buffer.\n",
1589 bufsize);
1590 retval = (-EOVERFLOW);
1591 goto out;
1592 }
1593 if (STp->block_size)
1594 STbp->buffer_blocks = bufsize / STp->block_size;
1595 }
1596
1597 out:
1598 return retval;
1599 }
1600
1601
1602 /* Can be called more than once after each setup_buffer() */
1603 static void release_buffering(struct scsi_tape *STp, int is_read)
1604 {
1605 struct st_buffer *STbp;
1606
1607 STbp = STp->buffer;
1608 if (STbp->do_dio) {
1609 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1610 STbp->do_dio = 0;
1611 STbp->sg_segs = 0;
1612 }
1613 }
1614
1615
1616 /* Write command */
1617 static ssize_t
1618 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1619 {
1620 ssize_t total;
1621 ssize_t i, do_count, blks, transfer;
1622 ssize_t retval;
1623 int undone, retry_eot = 0, scode;
1624 int async_write;
1625 unsigned char cmd[MAX_COMMAND_SIZE];
1626 const char __user *b_point;
1627 struct st_request *SRpnt = NULL;
1628 struct scsi_tape *STp = filp->private_data;
1629 struct st_modedef *STm;
1630 struct st_partstat *STps;
1631 struct st_buffer *STbp;
1632
1633 if (mutex_lock_interruptible(&STp->lock))
1634 return -ERESTARTSYS;
1635
1636 retval = rw_checks(STp, filp, count);
1637 if (retval || count == 0)
1638 goto out;
1639
1640 /* Write must be integral number of blocks */
1641 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1642 st_printk(KERN_WARNING, STp,
1643 "Write not multiple of tape block size.\n");
1644 retval = (-EINVAL);
1645 goto out;
1646 }
1647
1648 STm = &(STp->modes[STp->current_mode]);
1649 STps = &(STp->ps[STp->partition]);
1650
1651 if (STp->write_prot) {
1652 retval = (-EACCES);
1653 goto out;
1654 }
1655
1656
1657 if (STps->rw == ST_READING) {
1658 retval = flush_buffer(STp, 0);
1659 if (retval)
1660 goto out;
1661 STps->rw = ST_WRITING;
1662 } else if (STps->rw != ST_WRITING &&
1663 STps->drv_file == 0 && STps->drv_block == 0) {
1664 if ((retval = set_mode_densblk(STp, STm)) < 0)
1665 goto out;
1666 if (STm->default_compression != ST_DONT_TOUCH &&
1667 !(STp->compression_changed)) {
1668 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1669 st_printk(KERN_WARNING, STp,
1670 "Can't set default compression.\n");
1671 if (modes_defined) {
1672 retval = (-EINVAL);
1673 goto out;
1674 }
1675 }
1676 }
1677 }
1678
1679 STbp = STp->buffer;
1680 i = write_behind_check(STp);
1681 if (i) {
1682 if (i == -ENOSPC)
1683 STps->eof = ST_EOM_OK;
1684 else
1685 STps->eof = ST_EOM_ERROR;
1686 }
1687
1688 if (STps->eof == ST_EOM_OK) {
1689 STps->eof = ST_EOD_1; /* allow next write */
1690 retval = (-ENOSPC);
1691 goto out;
1692 }
1693 else if (STps->eof == ST_EOM_ERROR) {
1694 retval = (-EIO);
1695 goto out;
1696 }
1697
1698 /* Check the buffer readability in cases where copy_user might catch
1699 the problems after some tape movement. */
1700 if (STp->block_size != 0 &&
1701 !STbp->do_dio &&
1702 (copy_from_user(&i, buf, 1) != 0 ||
1703 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1704 retval = (-EFAULT);
1705 goto out;
1706 }
1707
1708 retval = setup_buffering(STp, buf, count, 0);
1709 if (retval)
1710 goto out;
1711
1712 total = count;
1713
1714 memset(cmd, 0, MAX_COMMAND_SIZE);
1715 cmd[0] = WRITE_6;
1716 cmd[1] = (STp->block_size != 0);
1717
1718 STps->rw = ST_WRITING;
1719
1720 b_point = buf;
1721 while (count > 0 && !retry_eot) {
1722
1723 if (STbp->do_dio) {
1724 do_count = count;
1725 }
1726 else {
1727 if (STp->block_size == 0)
1728 do_count = count;
1729 else {
1730 do_count = STbp->buffer_blocks * STp->block_size -
1731 STbp->buffer_bytes;
1732 if (do_count > count)
1733 do_count = count;
1734 }
1735
1736 i = append_to_buffer(b_point, STbp, do_count);
1737 if (i) {
1738 retval = i;
1739 goto out;
1740 }
1741 }
1742 count -= do_count;
1743 b_point += do_count;
1744
1745 async_write = STp->block_size == 0 && !STbp->do_dio &&
1746 STm->do_async_writes && STps->eof < ST_EOM_OK;
1747
1748 if (STp->block_size != 0 && STm->do_buffer_writes &&
1749 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1750 STbp->buffer_bytes < STbp->buffer_size) {
1751 STp->dirty = 1;
1752 /* Don't write a buffer that is not full enough. */
1753 if (!async_write && count == 0)
1754 break;
1755 }
1756
1757 retry_write:
1758 if (STp->block_size == 0)
1759 blks = transfer = do_count;
1760 else {
1761 if (!STbp->do_dio)
1762 blks = STbp->buffer_bytes;
1763 else
1764 blks = do_count;
1765 blks /= STp->block_size;
1766 transfer = blks * STp->block_size;
1767 }
1768 cmd[2] = blks >> 16;
1769 cmd[3] = blks >> 8;
1770 cmd[4] = blks;
1771
1772 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1773 STp->device->request_queue->rq_timeout,
1774 MAX_WRITE_RETRIES, !async_write);
1775 if (!SRpnt) {
1776 retval = STbp->syscall_result;
1777 goto out;
1778 }
1779 if (async_write && !STbp->syscall_result) {
1780 STbp->writing = transfer;
1781 STp->dirty = !(STbp->writing ==
1782 STbp->buffer_bytes);
1783 SRpnt = NULL; /* Prevent releasing this request! */
1784 DEB( STp->write_pending = 1; )
1785 break;
1786 }
1787
1788 if (STbp->syscall_result != 0) {
1789 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1790
1791 DEBC_printk(STp, "Error on write:\n");
1792 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1793 scode = cmdstatp->sense_hdr.sense_key;
1794 if (cmdstatp->remainder_valid)
1795 undone = (int)cmdstatp->uremainder64;
1796 else if (STp->block_size == 0 &&
1797 scode == VOLUME_OVERFLOW)
1798 undone = transfer;
1799 else
1800 undone = 0;
1801 if (STp->block_size != 0)
1802 undone *= STp->block_size;
1803 if (undone <= do_count) {
1804 /* Only data from this write is not written */
1805 count += undone;
1806 b_point -= undone;
1807 do_count -= undone;
1808 if (STp->block_size)
1809 blks = (transfer - undone) / STp->block_size;
1810 STps->eof = ST_EOM_OK;
1811 /* Continue in fixed block mode if all written
1812 in this request but still something left to write
1813 (retval left to zero)
1814 */
1815 if (STp->block_size == 0 ||
1816 undone > 0 || count == 0)
1817 retval = (-ENOSPC); /* EOM within current request */
1818 DEBC_printk(STp, "EOM with %d "
1819 "bytes unwritten.\n",
1820 (int)count);
1821 } else {
1822 /* EOT within data buffered earlier (possible only
1823 in fixed block mode without direct i/o) */
1824 if (!retry_eot && !cmdstatp->deferred &&
1825 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1826 move_buffer_data(STp->buffer, transfer - undone);
1827 retry_eot = 1;
1828 if (STps->drv_block >= 0) {
1829 STps->drv_block += (transfer - undone) /
1830 STp->block_size;
1831 }
1832 STps->eof = ST_EOM_OK;
1833 DEBC_printk(STp, "Retry "
1834 "write of %d "
1835 "bytes at EOM.\n",
1836 STp->buffer->buffer_bytes);
1837 goto retry_write;
1838 }
1839 else {
1840 /* Either error within data buffered by driver or
1841 failed retry */
1842 count -= do_count;
1843 blks = do_count = 0;
1844 STps->eof = ST_EOM_ERROR;
1845 STps->drv_block = (-1); /* Too cautious? */
1846 retval = (-EIO); /* EOM for old data */
1847 DEBC_printk(STp, "EOM with "
1848 "lost data.\n");
1849 }
1850 }
1851 } else {
1852 count += do_count;
1853 STps->drv_block = (-1); /* Too cautious? */
1854 retval = STbp->syscall_result;
1855 }
1856
1857 }
1858
1859 if (STps->drv_block >= 0) {
1860 if (STp->block_size == 0)
1861 STps->drv_block += (do_count > 0);
1862 else
1863 STps->drv_block += blks;
1864 }
1865
1866 STbp->buffer_bytes = 0;
1867 STp->dirty = 0;
1868
1869 if (retval || retry_eot) {
1870 if (count < total)
1871 retval = total - count;
1872 goto out;
1873 }
1874 }
1875
1876 if (STps->eof == ST_EOD_1)
1877 STps->eof = ST_EOM_OK;
1878 else if (STps->eof != ST_EOM_OK)
1879 STps->eof = ST_NOEOF;
1880 retval = total - count;
1881
1882 out:
1883 if (SRpnt != NULL)
1884 st_release_request(SRpnt);
1885 release_buffering(STp, 0);
1886 mutex_unlock(&STp->lock);
1887
1888 return retval;
1889 }
1890 \f
1891 /* Read data from the tape. Returns zero in the normal case, one if the
1892 eof status has changed, and the negative error code in case of a
1893 fatal error. Otherwise updates the buffer and the eof state.
1894
1895 Does release user buffer mapping if it is set.
1896 */
1897 static long read_tape(struct scsi_tape *STp, long count,
1898 struct st_request ** aSRpnt)
1899 {
1900 int transfer, blks, bytes;
1901 unsigned char cmd[MAX_COMMAND_SIZE];
1902 struct st_request *SRpnt;
1903 struct st_modedef *STm;
1904 struct st_partstat *STps;
1905 struct st_buffer *STbp;
1906 int retval = 0;
1907
1908 if (count == 0)
1909 return 0;
1910
1911 STm = &(STp->modes[STp->current_mode]);
1912 STps = &(STp->ps[STp->partition]);
1913 if (STps->eof == ST_FM_HIT)
1914 return 1;
1915 STbp = STp->buffer;
1916
1917 if (STp->block_size == 0)
1918 blks = bytes = count;
1919 else {
1920 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1921 blks = (STp->buffer)->buffer_blocks;
1922 bytes = blks * STp->block_size;
1923 } else {
1924 bytes = count;
1925 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1926 bytes = (STp->buffer)->buffer_size;
1927 blks = bytes / STp->block_size;
1928 bytes = blks * STp->block_size;
1929 }
1930 }
1931
1932 memset(cmd, 0, MAX_COMMAND_SIZE);
1933 cmd[0] = READ_6;
1934 cmd[1] = (STp->block_size != 0);
1935 if (!cmd[1] && STp->sili)
1936 cmd[1] |= 2;
1937 cmd[2] = blks >> 16;
1938 cmd[3] = blks >> 8;
1939 cmd[4] = blks;
1940
1941 SRpnt = *aSRpnt;
1942 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1943 STp->device->request_queue->rq_timeout,
1944 MAX_RETRIES, 1);
1945 release_buffering(STp, 1);
1946 *aSRpnt = SRpnt;
1947 if (!SRpnt)
1948 return STbp->syscall_result;
1949
1950 STbp->read_pointer = 0;
1951 STps->at_sm = 0;
1952
1953 /* Something to check */
1954 if (STbp->syscall_result) {
1955 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1956
1957 retval = 1;
1958 DEBC_printk(STp,
1959 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1960 SRpnt->sense[0], SRpnt->sense[1],
1961 SRpnt->sense[2], SRpnt->sense[3],
1962 SRpnt->sense[4], SRpnt->sense[5],
1963 SRpnt->sense[6], SRpnt->sense[7]);
1964 if (cmdstatp->have_sense) {
1965
1966 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1967 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1968
1969 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1970 /* Compute the residual count */
1971 if (cmdstatp->remainder_valid)
1972 transfer = (int)cmdstatp->uremainder64;
1973 else
1974 transfer = 0;
1975 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1976 if (STp->block_size == 0)
1977 transfer = bytes;
1978 /* Some drives set ILI with MEDIUM ERROR */
1979 cmdstatp->flags &= ~SENSE_ILI;
1980 }
1981
1982 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1983 if (STp->block_size == 0 &&
1984 transfer < 0) {
1985 st_printk(KERN_NOTICE, STp,
1986 "Failed to read %d "
1987 "byte block with %d "
1988 "byte transfer.\n",
1989 bytes - transfer,
1990 bytes);
1991 if (STps->drv_block >= 0)
1992 STps->drv_block += 1;
1993 STbp->buffer_bytes = 0;
1994 return (-ENOMEM);
1995 } else if (STp->block_size == 0) {
1996 STbp->buffer_bytes = bytes - transfer;
1997 } else {
1998 st_release_request(SRpnt);
1999 SRpnt = *aSRpnt = NULL;
2000 if (transfer == blks) { /* We did not get anything, error */
2001 st_printk(KERN_NOTICE, STp,
2002 "Incorrect "
2003 "block size.\n");
2004 if (STps->drv_block >= 0)
2005 STps->drv_block += blks - transfer + 1;
2006 st_int_ioctl(STp, MTBSR, 1);
2007 return (-EIO);
2008 }
2009 /* We have some data, deliver it */
2010 STbp->buffer_bytes = (blks - transfer) *
2011 STp->block_size;
2012 DEBC_printk(STp, "ILI but "
2013 "enough data "
2014 "received %ld "
2015 "%d.\n", count,
2016 STbp->buffer_bytes);
2017 if (STps->drv_block >= 0)
2018 STps->drv_block += 1;
2019 if (st_int_ioctl(STp, MTBSR, 1))
2020 return (-EIO);
2021 }
2022 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2023 if (STps->eof != ST_FM_HIT)
2024 STps->eof = ST_FM_HIT;
2025 else
2026 STps->eof = ST_EOD_2;
2027 if (STp->block_size == 0)
2028 STbp->buffer_bytes = 0;
2029 else
2030 STbp->buffer_bytes =
2031 bytes - transfer * STp->block_size;
2032 DEBC_printk(STp, "EOF detected (%d "
2033 "bytes read).\n",
2034 STbp->buffer_bytes);
2035 } else if (cmdstatp->flags & SENSE_EOM) {
2036 if (STps->eof == ST_FM)
2037 STps->eof = ST_EOD_1;
2038 else
2039 STps->eof = ST_EOM_OK;
2040 if (STp->block_size == 0)
2041 STbp->buffer_bytes = bytes - transfer;
2042 else
2043 STbp->buffer_bytes =
2044 bytes - transfer * STp->block_size;
2045
2046 DEBC_printk(STp, "EOM detected (%d "
2047 "bytes read).\n",
2048 STbp->buffer_bytes);
2049 }
2050 }
2051 /* end of EOF, EOM, ILI test */
2052 else { /* nonzero sense key */
2053 DEBC_printk(STp, "Tape error while reading.\n");
2054 STps->drv_block = (-1);
2055 if (STps->eof == ST_FM &&
2056 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2057 DEBC_printk(STp, "Zero returned for "
2058 "first BLANK CHECK "
2059 "after EOF.\n");
2060 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2061 } else /* Some other extended sense code */
2062 retval = (-EIO);
2063 }
2064
2065 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2066 STbp->buffer_bytes = 0;
2067 }
2068 /* End of extended sense test */
2069 else { /* Non-extended sense */
2070 retval = STbp->syscall_result;
2071 }
2072
2073 }
2074 /* End of error handling */
2075 else { /* Read successful */
2076 STbp->buffer_bytes = bytes;
2077 if (STp->sili) /* In fixed block mode residual is always zero here */
2078 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2079 }
2080
2081 if (STps->drv_block >= 0) {
2082 if (STp->block_size == 0)
2083 STps->drv_block++;
2084 else
2085 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2086 }
2087 return retval;
2088 }
2089 \f
2090
2091 /* Read command */
2092 static ssize_t
2093 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2094 {
2095 ssize_t total;
2096 ssize_t retval = 0;
2097 ssize_t i, transfer;
2098 int special, do_dio = 0;
2099 struct st_request *SRpnt = NULL;
2100 struct scsi_tape *STp = filp->private_data;
2101 struct st_modedef *STm;
2102 struct st_partstat *STps;
2103 struct st_buffer *STbp = STp->buffer;
2104
2105 if (mutex_lock_interruptible(&STp->lock))
2106 return -ERESTARTSYS;
2107
2108 retval = rw_checks(STp, filp, count);
2109 if (retval || count == 0)
2110 goto out;
2111
2112 STm = &(STp->modes[STp->current_mode]);
2113 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2114 if (!STm->do_read_ahead) {
2115 retval = (-EINVAL); /* Read must be integral number of blocks */
2116 goto out;
2117 }
2118 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2119 }
2120
2121 STps = &(STp->ps[STp->partition]);
2122 if (STps->rw == ST_WRITING) {
2123 retval = flush_buffer(STp, 0);
2124 if (retval)
2125 goto out;
2126 STps->rw = ST_READING;
2127 }
2128 DEB(
2129 if (debugging && STps->eof != ST_NOEOF)
2130 st_printk(ST_DEB_MSG, STp,
2131 "EOF/EOM flag up (%d). Bytes %d\n",
2132 STps->eof, STbp->buffer_bytes);
2133 ) /* end DEB */
2134
2135 retval = setup_buffering(STp, buf, count, 1);
2136 if (retval)
2137 goto out;
2138 do_dio = STbp->do_dio;
2139
2140 if (STbp->buffer_bytes == 0 &&
2141 STps->eof >= ST_EOD_1) {
2142 if (STps->eof < ST_EOD) {
2143 STps->eof += 1;
2144 retval = 0;
2145 goto out;
2146 }
2147 retval = (-EIO); /* EOM or Blank Check */
2148 goto out;
2149 }
2150
2151 if (do_dio) {
2152 /* Check the buffer writability before any tape movement. Don't alter
2153 buffer data. */
2154 if (copy_from_user(&i, buf, 1) != 0 ||
2155 copy_to_user(buf, &i, 1) != 0 ||
2156 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2157 copy_to_user(buf + count - 1, &i, 1) != 0) {
2158 retval = (-EFAULT);
2159 goto out;
2160 }
2161 }
2162
2163 STps->rw = ST_READING;
2164
2165
2166 /* Loop until enough data in buffer or a special condition found */
2167 for (total = 0, special = 0; total < count && !special;) {
2168
2169 /* Get new data if the buffer is empty */
2170 if (STbp->buffer_bytes == 0) {
2171 special = read_tape(STp, count - total, &SRpnt);
2172 if (special < 0) { /* No need to continue read */
2173 retval = special;
2174 goto out;
2175 }
2176 }
2177
2178 /* Move the data from driver buffer to user buffer */
2179 if (STbp->buffer_bytes > 0) {
2180 DEB(
2181 if (debugging && STps->eof != ST_NOEOF)
2182 st_printk(ST_DEB_MSG, STp,
2183 "EOF up (%d). Left %d, needed %d.\n",
2184 STps->eof, STbp->buffer_bytes,
2185 (int)(count - total));
2186 ) /* end DEB */
2187 transfer = STbp->buffer_bytes < count - total ?
2188 STbp->buffer_bytes : count - total;
2189 if (!do_dio) {
2190 i = from_buffer(STbp, buf, transfer);
2191 if (i) {
2192 retval = i;
2193 goto out;
2194 }
2195 }
2196 buf += transfer;
2197 total += transfer;
2198 }
2199
2200 if (STp->block_size == 0)
2201 break; /* Read only one variable length block */
2202
2203 } /* for (total = 0, special = 0;
2204 total < count && !special; ) */
2205
2206 /* Change the eof state if no data from tape or buffer */
2207 if (total == 0) {
2208 if (STps->eof == ST_FM_HIT) {
2209 STps->eof = ST_FM;
2210 STps->drv_block = 0;
2211 if (STps->drv_file >= 0)
2212 STps->drv_file++;
2213 } else if (STps->eof == ST_EOD_1) {
2214 STps->eof = ST_EOD_2;
2215 STps->drv_block = 0;
2216 if (STps->drv_file >= 0)
2217 STps->drv_file++;
2218 } else if (STps->eof == ST_EOD_2)
2219 STps->eof = ST_EOD;
2220 } else if (STps->eof == ST_FM)
2221 STps->eof = ST_NOEOF;
2222 retval = total;
2223
2224 out:
2225 if (SRpnt != NULL) {
2226 st_release_request(SRpnt);
2227 SRpnt = NULL;
2228 }
2229 if (do_dio) {
2230 release_buffering(STp, 1);
2231 STbp->buffer_bytes = 0;
2232 }
2233 mutex_unlock(&STp->lock);
2234
2235 return retval;
2236 }
2237 \f
2238
2239
2240 DEB(
2241 /* Set the driver options */
2242 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2243 {
2244 if (debugging) {
2245 st_printk(KERN_INFO, STp,
2246 "Mode %d options: buffer writes: %d, "
2247 "async writes: %d, read ahead: %d\n",
2248 STp->current_mode, STm->do_buffer_writes,
2249 STm->do_async_writes, STm->do_read_ahead);
2250 st_printk(KERN_INFO, STp,
2251 " can bsr: %d, two FMs: %d, "
2252 "fast mteom: %d, auto lock: %d,\n",
2253 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2254 STp->do_auto_lock);
2255 st_printk(KERN_INFO, STp,
2256 " defs for wr: %d, no block limits: %d, "
2257 "partitions: %d, s2 log: %d\n",
2258 STm->defaults_for_writes, STp->omit_blklims,
2259 STp->can_partitions, STp->scsi2_logical);
2260 st_printk(KERN_INFO, STp,
2261 " sysv: %d nowait: %d sili: %d "
2262 "nowait_filemark: %d\n",
2263 STm->sysv, STp->immediate, STp->sili,
2264 STp->immediate_filemark);
2265 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2266 }
2267 }
2268 )
2269
2270
2271 static int st_set_options(struct scsi_tape *STp, long options)
2272 {
2273 int value;
2274 long code;
2275 struct st_modedef *STm;
2276 struct cdev *cd0, *cd1;
2277 struct device *d0, *d1;
2278
2279 STm = &(STp->modes[STp->current_mode]);
2280 if (!STm->defined) {
2281 cd0 = STm->cdevs[0];
2282 cd1 = STm->cdevs[1];
2283 d0 = STm->devs[0];
2284 d1 = STm->devs[1];
2285 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2286 STm->cdevs[0] = cd0;
2287 STm->cdevs[1] = cd1;
2288 STm->devs[0] = d0;
2289 STm->devs[1] = d1;
2290 modes_defined = 1;
2291 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2292 STp->current_mode);
2293 }
2294
2295 code = options & MT_ST_OPTIONS;
2296 if (code == MT_ST_BOOLEANS) {
2297 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2298 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2299 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2300 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2301 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2302 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2303 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2304 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2305 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2306 if ((STp->device)->scsi_level >= SCSI_2)
2307 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2308 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2309 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2310 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2311 STm->sysv = (options & MT_ST_SYSV) != 0;
2312 STp->sili = (options & MT_ST_SILI) != 0;
2313 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2314 st_log_options(STp, STm); )
2315 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2316 value = (code == MT_ST_SETBOOLEANS);
2317 if ((options & MT_ST_BUFFER_WRITES) != 0)
2318 STm->do_buffer_writes = value;
2319 if ((options & MT_ST_ASYNC_WRITES) != 0)
2320 STm->do_async_writes = value;
2321 if ((options & MT_ST_DEF_WRITES) != 0)
2322 STm->defaults_for_writes = value;
2323 if ((options & MT_ST_READ_AHEAD) != 0)
2324 STm->do_read_ahead = value;
2325 if ((options & MT_ST_TWO_FM) != 0)
2326 STp->two_fm = value;
2327 if ((options & MT_ST_FAST_MTEOM) != 0)
2328 STp->fast_mteom = value;
2329 if ((options & MT_ST_AUTO_LOCK) != 0)
2330 STp->do_auto_lock = value;
2331 if ((options & MT_ST_CAN_BSR) != 0)
2332 STp->can_bsr = value;
2333 if ((options & MT_ST_NO_BLKLIMS) != 0)
2334 STp->omit_blklims = value;
2335 if ((STp->device)->scsi_level >= SCSI_2 &&
2336 (options & MT_ST_CAN_PARTITIONS) != 0)
2337 STp->can_partitions = value;
2338 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2339 STp->scsi2_logical = value;
2340 if ((options & MT_ST_NOWAIT) != 0)
2341 STp->immediate = value;
2342 if ((options & MT_ST_NOWAIT_EOF) != 0)
2343 STp->immediate_filemark = value;
2344 if ((options & MT_ST_SYSV) != 0)
2345 STm->sysv = value;
2346 if ((options & MT_ST_SILI) != 0)
2347 STp->sili = value;
2348 DEB(
2349 if ((options & MT_ST_DEBUGGING) != 0)
2350 debugging = value;
2351 st_log_options(STp, STm); )
2352 } else if (code == MT_ST_WRITE_THRESHOLD) {
2353 /* Retained for compatibility */
2354 } else if (code == MT_ST_DEF_BLKSIZE) {
2355 value = (options & ~MT_ST_OPTIONS);
2356 if (value == ~MT_ST_OPTIONS) {
2357 STm->default_blksize = (-1);
2358 DEBC_printk(STp, "Default block size disabled.\n");
2359 } else {
2360 STm->default_blksize = value;
2361 DEBC_printk(STp,"Default block size set to "
2362 "%d bytes.\n", STm->default_blksize);
2363 if (STp->ready == ST_READY) {
2364 STp->blksize_changed = 0;
2365 set_mode_densblk(STp, STm);
2366 }
2367 }
2368 } else if (code == MT_ST_TIMEOUTS) {
2369 value = (options & ~MT_ST_OPTIONS);
2370 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2371 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2372 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2373 (value & ~MT_ST_SET_LONG_TIMEOUT));
2374 } else {
2375 blk_queue_rq_timeout(STp->device->request_queue,
2376 value * HZ);
2377 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2378 value);
2379 }
2380 } else if (code == MT_ST_SET_CLN) {
2381 value = (options & ~MT_ST_OPTIONS) & 0xff;
2382 if (value != 0 &&
2383 (value < EXTENDED_SENSE_START ||
2384 value >= SCSI_SENSE_BUFFERSIZE))
2385 return (-EINVAL);
2386 STp->cln_mode = value;
2387 STp->cln_sense_mask = (options >> 8) & 0xff;
2388 STp->cln_sense_value = (options >> 16) & 0xff;
2389 st_printk(KERN_INFO, STp,
2390 "Cleaning request mode %d, mask %02x, value %02x\n",
2391 value, STp->cln_sense_mask, STp->cln_sense_value);
2392 } else if (code == MT_ST_DEF_OPTIONS) {
2393 code = (options & ~MT_ST_CLEAR_DEFAULT);
2394 value = (options & MT_ST_CLEAR_DEFAULT);
2395 if (code == MT_ST_DEF_DENSITY) {
2396 if (value == MT_ST_CLEAR_DEFAULT) {
2397 STm->default_density = (-1);
2398 DEBC_printk(STp,
2399 "Density default disabled.\n");
2400 } else {
2401 STm->default_density = value & 0xff;
2402 DEBC_printk(STp, "Density default set to %x\n",
2403 STm->default_density);
2404 if (STp->ready == ST_READY) {
2405 STp->density_changed = 0;
2406 set_mode_densblk(STp, STm);
2407 }
2408 }
2409 } else if (code == MT_ST_DEF_DRVBUFFER) {
2410 if (value == MT_ST_CLEAR_DEFAULT) {
2411 STp->default_drvbuffer = 0xff;
2412 DEBC_printk(STp,
2413 "Drive buffer default disabled.\n");
2414 } else {
2415 STp->default_drvbuffer = value & 7;
2416 DEBC_printk(STp,
2417 "Drive buffer default set to %x\n",
2418 STp->default_drvbuffer);
2419 if (STp->ready == ST_READY)
2420 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2421 }
2422 } else if (code == MT_ST_DEF_COMPRESSION) {
2423 if (value == MT_ST_CLEAR_DEFAULT) {
2424 STm->default_compression = ST_DONT_TOUCH;
2425 DEBC_printk(STp,
2426 "Compression default disabled.\n");
2427 } else {
2428 if ((value & 0xff00) != 0) {
2429 STp->c_algo = (value & 0xff00) >> 8;
2430 DEBC_printk(STp, "Compression "
2431 "algorithm set to 0x%x.\n",
2432 STp->c_algo);
2433 }
2434 if ((value & 0xff) != 0xff) {
2435 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2436 DEBC_printk(STp, "Compression default "
2437 "set to %x\n",
2438 (value & 1));
2439 if (STp->ready == ST_READY) {
2440 STp->compression_changed = 0;
2441 st_compression(STp, (STm->default_compression == ST_YES));
2442 }
2443 }
2444 }
2445 }
2446 } else
2447 return (-EIO);
2448
2449 return 0;
2450 }
2451 \f
2452 #define MODE_HEADER_LENGTH 4
2453
2454 /* Mode header and page byte offsets */
2455 #define MH_OFF_DATA_LENGTH 0
2456 #define MH_OFF_MEDIUM_TYPE 1
2457 #define MH_OFF_DEV_SPECIFIC 2
2458 #define MH_OFF_BDESCS_LENGTH 3
2459 #define MP_OFF_PAGE_NBR 0
2460 #define MP_OFF_PAGE_LENGTH 1
2461
2462 /* Mode header and page bit masks */
2463 #define MH_BIT_WP 0x80
2464 #define MP_MSK_PAGE_NBR 0x3f
2465
2466 /* Don't return block descriptors */
2467 #define MODE_SENSE_OMIT_BDESCS 0x08
2468
2469 #define MODE_SELECT_PAGE_FORMAT 0x10
2470
2471 /* Read a mode page into the tape buffer. The block descriptors are included
2472 if incl_block_descs is true. The page control is ored to the page number
2473 parameter, if necessary. */
2474 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2475 {
2476 unsigned char cmd[MAX_COMMAND_SIZE];
2477 struct st_request *SRpnt;
2478
2479 memset(cmd, 0, MAX_COMMAND_SIZE);
2480 cmd[0] = MODE_SENSE;
2481 if (omit_block_descs)
2482 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2483 cmd[2] = page;
2484 cmd[4] = 255;
2485
2486 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2487 STp->device->request_queue->rq_timeout, 0, 1);
2488 if (SRpnt == NULL)
2489 return (STp->buffer)->syscall_result;
2490
2491 st_release_request(SRpnt);
2492
2493 return STp->buffer->syscall_result;
2494 }
2495
2496
2497 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2498 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2499 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2500 {
2501 int pgo;
2502 unsigned char cmd[MAX_COMMAND_SIZE];
2503 struct st_request *SRpnt;
2504 int timeout;
2505
2506 memset(cmd, 0, MAX_COMMAND_SIZE);
2507 cmd[0] = MODE_SELECT;
2508 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2509 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2510 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2511
2512 /* Clear reserved fields */
2513 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2514 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2515 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2516 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2517
2518 timeout = slow ?
2519 STp->long_timeout : STp->device->request_queue->rq_timeout;
2520 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2521 timeout, 0, 1);
2522 if (SRpnt == NULL)
2523 return (STp->buffer)->syscall_result;
2524
2525 st_release_request(SRpnt);
2526
2527 return STp->buffer->syscall_result;
2528 }
2529
2530
2531 #define COMPRESSION_PAGE 0x0f
2532 #define COMPRESSION_PAGE_LENGTH 16
2533
2534 #define CP_OFF_DCE_DCC 2
2535 #define CP_OFF_C_ALGO 7
2536
2537 #define DCE_MASK 0x80
2538 #define DCC_MASK 0x40
2539 #define RED_MASK 0x60
2540
2541
2542 /* Control the compression with mode page 15. Algorithm not changed if zero.
2543
2544 The block descriptors are read and written because Sony SDT-7000 does not
2545 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2546 Including block descriptors should not cause any harm to other drives. */
2547
2548 static int st_compression(struct scsi_tape * STp, int state)
2549 {
2550 int retval;
2551 int mpoffs; /* Offset to mode page start */
2552 unsigned char *b_data = (STp->buffer)->b_data;
2553
2554 if (STp->ready != ST_READY)
2555 return (-EIO);
2556
2557 /* Read the current page contents */
2558 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2559 if (retval) {
2560 DEBC_printk(STp, "Compression mode page not supported.\n");
2561 return (-EIO);
2562 }
2563
2564 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2565 DEBC_printk(STp, "Compression state is %d.\n",
2566 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2567
2568 /* Check if compression can be changed */
2569 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2570 DEBC_printk(STp, "Compression not supported.\n");
2571 return (-EIO);
2572 }
2573
2574 /* Do the change */
2575 if (state) {
2576 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2577 if (STp->c_algo != 0)
2578 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2579 }
2580 else {
2581 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2582 if (STp->c_algo != 0)
2583 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2584 }
2585
2586 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2587 if (retval) {
2588 DEBC_printk(STp, "Compression change failed.\n");
2589 return (-EIO);
2590 }
2591 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2592
2593 STp->compression_changed = 1;
2594 return 0;
2595 }
2596
2597
2598 /* Process the load and unload commands (does unload if the load code is zero) */
2599 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2600 {
2601 int retval = (-EIO), timeout;
2602 unsigned char cmd[MAX_COMMAND_SIZE];
2603 struct st_partstat *STps;
2604 struct st_request *SRpnt;
2605
2606 if (STp->ready != ST_READY && !load_code) {
2607 if (STp->ready == ST_NO_TAPE)
2608 return (-ENOMEDIUM);
2609 else
2610 return (-EIO);
2611 }
2612
2613 memset(cmd, 0, MAX_COMMAND_SIZE);
2614 cmd[0] = START_STOP;
2615 if (load_code)
2616 cmd[4] |= 1;
2617 /*
2618 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2619 */
2620 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2621 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2622 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2623 (cmd[4]) ? "" : "un",
2624 load_code - MT_ST_HPLOADER_OFFSET);
2625 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2626 }
2627 if (STp->immediate) {
2628 cmd[1] = 1; /* Don't wait for completion */
2629 timeout = STp->device->request_queue->rq_timeout;
2630 }
2631 else
2632 timeout = STp->long_timeout;
2633
2634 DEBC(
2635 if (!load_code)
2636 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2637 else
2638 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2639 );
2640
2641 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2642 timeout, MAX_RETRIES, 1);
2643 if (!SRpnt)
2644 return (STp->buffer)->syscall_result;
2645
2646 retval = (STp->buffer)->syscall_result;
2647 st_release_request(SRpnt);
2648
2649 if (!retval) { /* SCSI command successful */
2650
2651 if (!load_code) {
2652 STp->rew_at_close = 0;
2653 STp->ready = ST_NO_TAPE;
2654 }
2655 else {
2656 STp->rew_at_close = STp->autorew_dev;
2657 retval = check_tape(STp, filp);
2658 if (retval > 0)
2659 retval = 0;
2660 }
2661 }
2662 else {
2663 STps = &(STp->ps[STp->partition]);
2664 STps->drv_file = STps->drv_block = (-1);
2665 }
2666
2667 return retval;
2668 }
2669 \f
2670 #if DEBUG
2671 #define ST_DEB_FORWARD 0
2672 #define ST_DEB_BACKWARD 1
2673 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2674 {
2675 s32 sc;
2676
2677 if (!debugging)
2678 return;
2679
2680 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2681 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2682 if (direction)
2683 sc = -sc;
2684 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2685 direction ? "backward" : "forward", sc, units);
2686 }
2687 #else
2688 #define ST_DEB_FORWARD 0
2689 #define ST_DEB_BACKWARD 1
2690 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2691 #endif
2692
2693
2694 /* Internal ioctl function */
2695 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2696 {
2697 int timeout;
2698 long ltmp;
2699 int ioctl_result;
2700 int chg_eof = 1;
2701 unsigned char cmd[MAX_COMMAND_SIZE];
2702 struct st_request *SRpnt;
2703 struct st_partstat *STps;
2704 int fileno, blkno, at_sm, undone;
2705 int datalen = 0, direction = DMA_NONE;
2706
2707 WARN_ON(STp->buffer->do_dio != 0);
2708 if (STp->ready != ST_READY) {
2709 if (STp->ready == ST_NO_TAPE)
2710 return (-ENOMEDIUM);
2711 else
2712 return (-EIO);
2713 }
2714 timeout = STp->long_timeout;
2715 STps = &(STp->ps[STp->partition]);
2716 fileno = STps->drv_file;
2717 blkno = STps->drv_block;
2718 at_sm = STps->at_sm;
2719
2720 memset(cmd, 0, MAX_COMMAND_SIZE);
2721 switch (cmd_in) {
2722 case MTFSFM:
2723 chg_eof = 0; /* Changed from the FSF after this */
2724 case MTFSF:
2725 cmd[0] = SPACE;
2726 cmd[1] = 0x01; /* Space FileMarks */
2727 cmd[2] = (arg >> 16);
2728 cmd[3] = (arg >> 8);
2729 cmd[4] = arg;
2730 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2731 if (fileno >= 0)
2732 fileno += arg;
2733 blkno = 0;
2734 at_sm &= (arg == 0);
2735 break;
2736 case MTBSFM:
2737 chg_eof = 0; /* Changed from the FSF after this */
2738 case MTBSF:
2739 cmd[0] = SPACE;
2740 cmd[1] = 0x01; /* Space FileMarks */
2741 ltmp = (-arg);
2742 cmd[2] = (ltmp >> 16);
2743 cmd[3] = (ltmp >> 8);
2744 cmd[4] = ltmp;
2745 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2746 if (fileno >= 0)
2747 fileno -= arg;
2748 blkno = (-1); /* We can't know the block number */
2749 at_sm &= (arg == 0);
2750 break;
2751 case MTFSR:
2752 cmd[0] = SPACE;
2753 cmd[1] = 0x00; /* Space Blocks */
2754 cmd[2] = (arg >> 16);
2755 cmd[3] = (arg >> 8);
2756 cmd[4] = arg;
2757 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2758 if (blkno >= 0)
2759 blkno += arg;
2760 at_sm &= (arg == 0);
2761 break;
2762 case MTBSR:
2763 cmd[0] = SPACE;
2764 cmd[1] = 0x00; /* Space Blocks */
2765 ltmp = (-arg);
2766 cmd[2] = (ltmp >> 16);
2767 cmd[3] = (ltmp >> 8);
2768 cmd[4] = ltmp;
2769 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2770 if (blkno >= 0)
2771 blkno -= arg;
2772 at_sm &= (arg == 0);
2773 break;
2774 case MTFSS:
2775 cmd[0] = SPACE;
2776 cmd[1] = 0x04; /* Space Setmarks */
2777 cmd[2] = (arg >> 16);
2778 cmd[3] = (arg >> 8);
2779 cmd[4] = arg;
2780 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2781 if (arg != 0) {
2782 blkno = fileno = (-1);
2783 at_sm = 1;
2784 }
2785 break;
2786 case MTBSS:
2787 cmd[0] = SPACE;
2788 cmd[1] = 0x04; /* Space Setmarks */
2789 ltmp = (-arg);
2790 cmd[2] = (ltmp >> 16);
2791 cmd[3] = (ltmp >> 8);
2792 cmd[4] = ltmp;
2793 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2794 if (arg != 0) {
2795 blkno = fileno = (-1);
2796 at_sm = 1;
2797 }
2798 break;
2799 case MTWEOF:
2800 case MTWEOFI:
2801 case MTWSM:
2802 if (STp->write_prot)
2803 return (-EACCES);
2804 cmd[0] = WRITE_FILEMARKS;
2805 if (cmd_in == MTWSM)
2806 cmd[1] = 2;
2807 if (cmd_in == MTWEOFI ||
2808 (cmd_in == MTWEOF && STp->immediate_filemark))
2809 cmd[1] |= 1;
2810 cmd[2] = (arg >> 16);
2811 cmd[3] = (arg >> 8);
2812 cmd[4] = arg;
2813 timeout = STp->device->request_queue->rq_timeout;
2814 DEBC(
2815 if (cmd_in != MTWSM)
2816 st_printk(ST_DEB_MSG, STp,
2817 "Writing %d filemarks.\n",
2818 cmd[2] * 65536 +
2819 cmd[3] * 256 +
2820 cmd[4]);
2821 else
2822 st_printk(ST_DEB_MSG, STp,
2823 "Writing %d setmarks.\n",
2824 cmd[2] * 65536 +
2825 cmd[3] * 256 +
2826 cmd[4]);
2827 )
2828 if (fileno >= 0)
2829 fileno += arg;
2830 blkno = 0;
2831 at_sm = (cmd_in == MTWSM);
2832 break;
2833 case MTREW:
2834 cmd[0] = REZERO_UNIT;
2835 if (STp->immediate) {
2836 cmd[1] = 1; /* Don't wait for completion */
2837 timeout = STp->device->request_queue->rq_timeout;
2838 }
2839 DEBC_printk(STp, "Rewinding tape.\n");
2840 fileno = blkno = at_sm = 0;
2841 break;
2842 case MTNOP:
2843 DEBC_printk(STp, "No op on tape.\n");
2844 return 0; /* Should do something ? */
2845 break;
2846 case MTRETEN:
2847 cmd[0] = START_STOP;
2848 if (STp->immediate) {
2849 cmd[1] = 1; /* Don't wait for completion */
2850 timeout = STp->device->request_queue->rq_timeout;
2851 }
2852 cmd[4] = 3;
2853 DEBC_printk(STp, "Retensioning tape.\n");
2854 fileno = blkno = at_sm = 0;
2855 break;
2856 case MTEOM:
2857 if (!STp->fast_mteom) {
2858 /* space to the end of tape */
2859 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2860 fileno = STps->drv_file;
2861 if (STps->eof >= ST_EOD_1)
2862 return 0;
2863 /* The next lines would hide the number of spaced FileMarks
2864 That's why I inserted the previous lines. I had no luck
2865 with detecting EOM with FSF, so we go now to EOM.
2866 Joerg Weule */
2867 } else
2868 fileno = (-1);
2869 cmd[0] = SPACE;
2870 cmd[1] = 3;
2871 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2872 blkno = -1;
2873 at_sm = 0;
2874 break;
2875 case MTERASE:
2876 if (STp->write_prot)
2877 return (-EACCES);
2878 cmd[0] = ERASE;
2879 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2880 if (STp->immediate) {
2881 cmd[1] |= 2; /* Don't wait for completion */
2882 timeout = STp->device->request_queue->rq_timeout;
2883 }
2884 else
2885 timeout = STp->long_timeout * 8;
2886
2887 DEBC_printk(STp, "Erasing tape.\n");
2888 fileno = blkno = at_sm = 0;
2889 break;
2890 case MTSETBLK: /* Set block length */
2891 case MTSETDENSITY: /* Set tape density */
2892 case MTSETDRVBUFFER: /* Set drive buffering */
2893 case SET_DENS_AND_BLK: /* Set density and block size */
2894 chg_eof = 0;
2895 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2896 return (-EIO); /* Not allowed if data in buffer */
2897 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2898 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2899 STp->max_block > 0 &&
2900 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2901 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2902 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2903 return (-EINVAL);
2904 }
2905 cmd[0] = MODE_SELECT;
2906 if ((STp->use_pf & USE_PF))
2907 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2908 cmd[4] = datalen = 12;
2909 direction = DMA_TO_DEVICE;
2910
2911 memset((STp->buffer)->b_data, 0, 12);
2912 if (cmd_in == MTSETDRVBUFFER)
2913 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2914 else
2915 (STp->buffer)->b_data[2] =
2916 STp->drv_buffer << 4;
2917 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2918 if (cmd_in == MTSETDENSITY) {
2919 (STp->buffer)->b_data[4] = arg;
2920 STp->density_changed = 1; /* At least we tried ;-) */
2921 } else if (cmd_in == SET_DENS_AND_BLK)
2922 (STp->buffer)->b_data[4] = arg >> 24;
2923 else
2924 (STp->buffer)->b_data[4] = STp->density;
2925 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2926 ltmp = arg & MT_ST_BLKSIZE_MASK;
2927 if (cmd_in == MTSETBLK)
2928 STp->blksize_changed = 1; /* At least we tried ;-) */
2929 } else
2930 ltmp = STp->block_size;
2931 (STp->buffer)->b_data[9] = (ltmp >> 16);
2932 (STp->buffer)->b_data[10] = (ltmp >> 8);
2933 (STp->buffer)->b_data[11] = ltmp;
2934 timeout = STp->device->request_queue->rq_timeout;
2935 DEBC(
2936 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2937 st_printk(ST_DEB_MSG, STp,
2938 "Setting block size to %d bytes.\n",
2939 (STp->buffer)->b_data[9] * 65536 +
2940 (STp->buffer)->b_data[10] * 256 +
2941 (STp->buffer)->b_data[11]);
2942 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2943 st_printk(ST_DEB_MSG, STp,
2944 "Setting density code to %x.\n",
2945 (STp->buffer)->b_data[4]);
2946 if (cmd_in == MTSETDRVBUFFER)
2947 st_printk(ST_DEB_MSG, STp,
2948 "Setting drive buffer code to %d.\n",
2949 ((STp->buffer)->b_data[2] >> 4) & 7);
2950 )
2951 break;
2952 default:
2953 return (-ENOSYS);
2954 }
2955
2956 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2957 timeout, MAX_RETRIES, 1);
2958 if (!SRpnt)
2959 return (STp->buffer)->syscall_result;
2960
2961 ioctl_result = (STp->buffer)->syscall_result;
2962
2963 if (!ioctl_result) { /* SCSI command successful */
2964 st_release_request(SRpnt);
2965 SRpnt = NULL;
2966 STps->drv_block = blkno;
2967 STps->drv_file = fileno;
2968 STps->at_sm = at_sm;
2969
2970 if (cmd_in == MTBSFM)
2971 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2972 else if (cmd_in == MTFSFM)
2973 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2974
2975 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2976 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2977 if (STp->block_size != 0) {
2978 (STp->buffer)->buffer_blocks =
2979 (STp->buffer)->buffer_size / STp->block_size;
2980 }
2981 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2982 if (cmd_in == SET_DENS_AND_BLK)
2983 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2984 } else if (cmd_in == MTSETDRVBUFFER)
2985 STp->drv_buffer = (arg & 7);
2986 else if (cmd_in == MTSETDENSITY)
2987 STp->density = arg;
2988
2989 if (cmd_in == MTEOM)
2990 STps->eof = ST_EOD;
2991 else if (cmd_in == MTFSF)
2992 STps->eof = ST_FM;
2993 else if (chg_eof)
2994 STps->eof = ST_NOEOF;
2995
2996 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2997 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2998 } else { /* SCSI command was not completely successful. Don't return
2999 from this block without releasing the SCSI command block! */
3000 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3001
3002 if (cmdstatp->flags & SENSE_EOM) {
3003 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3004 cmd_in != MTBSR && cmd_in != MTBSS)
3005 STps->eof = ST_EOM_OK;
3006 STps->drv_block = 0;
3007 }
3008
3009 if (cmdstatp->remainder_valid)
3010 undone = (int)cmdstatp->uremainder64;
3011 else
3012 undone = 0;
3013
3014 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3015 cmdstatp->have_sense &&
3016 (cmdstatp->flags & SENSE_EOM)) {
3017 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3018 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3019 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3020 STps->eof = ST_NOEOF;
3021 } else { /* Writing EOF(s) failed */
3022 if (fileno >= 0)
3023 fileno -= undone;
3024 if (undone < arg)
3025 STps->eof = ST_NOEOF;
3026 }
3027 STps->drv_file = fileno;
3028 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3029 if (fileno >= 0)
3030 STps->drv_file = fileno - undone;
3031 else
3032 STps->drv_file = fileno;
3033 STps->drv_block = -1;
3034 STps->eof = ST_NOEOF;
3035 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3036 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3037 undone = (-undone);
3038 if (STps->drv_file >= 0)
3039 STps->drv_file = fileno + undone;
3040 STps->drv_block = 0;
3041 STps->eof = ST_NOEOF;
3042 } else if (cmd_in == MTFSR) {
3043 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3044 if (STps->drv_file >= 0)
3045 STps->drv_file++;
3046 STps->drv_block = 0;
3047 STps->eof = ST_FM;
3048 } else {
3049 if (blkno >= undone)
3050 STps->drv_block = blkno - undone;
3051 else
3052 STps->drv_block = (-1);
3053 STps->eof = ST_NOEOF;
3054 }
3055 } else if (cmd_in == MTBSR) {
3056 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3057 STps->drv_file--;
3058 STps->drv_block = (-1);
3059 } else {
3060 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3061 undone = (-undone);
3062 if (STps->drv_block >= 0)
3063 STps->drv_block = blkno + undone;
3064 }
3065 STps->eof = ST_NOEOF;
3066 } else if (cmd_in == MTEOM) {
3067 STps->drv_file = (-1);
3068 STps->drv_block = (-1);
3069 STps->eof = ST_EOD;
3070 } else if (cmd_in == MTSETBLK ||
3071 cmd_in == MTSETDENSITY ||
3072 cmd_in == MTSETDRVBUFFER ||
3073 cmd_in == SET_DENS_AND_BLK) {
3074 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3075 !(STp->use_pf & PF_TESTED)) {
3076 /* Try the other possible state of Page Format if not
3077 already tried */
3078 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3079 st_release_request(SRpnt);
3080 SRpnt = NULL;
3081 return st_int_ioctl(STp, cmd_in, arg);
3082 }
3083 } else if (chg_eof)
3084 STps->eof = ST_NOEOF;
3085
3086 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3087 STps->eof = ST_EOD;
3088
3089 st_release_request(SRpnt);
3090 SRpnt = NULL;
3091 }
3092
3093 return ioctl_result;
3094 }
3095 \f
3096
3097 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3098 structure. */
3099
3100 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3101 int logical)
3102 {
3103 int result;
3104 unsigned char scmd[MAX_COMMAND_SIZE];
3105 struct st_request *SRpnt;
3106
3107 if (STp->ready != ST_READY)
3108 return (-EIO);
3109
3110 memset(scmd, 0, MAX_COMMAND_SIZE);
3111 if ((STp->device)->scsi_level < SCSI_2) {
3112 scmd[0] = QFA_REQUEST_BLOCK;
3113 scmd[4] = 3;
3114 } else {
3115 scmd[0] = READ_POSITION;
3116 if (!logical && !STp->scsi2_logical)
3117 scmd[1] = 1;
3118 }
3119 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3120 STp->device->request_queue->rq_timeout,
3121 MAX_READY_RETRIES, 1);
3122 if (!SRpnt)
3123 return (STp->buffer)->syscall_result;
3124
3125 if ((STp->buffer)->syscall_result != 0 ||
3126 (STp->device->scsi_level >= SCSI_2 &&
3127 ((STp->buffer)->b_data[0] & 4) != 0)) {
3128 *block = *partition = 0;
3129 DEBC_printk(STp, " Can't read tape position.\n");
3130 result = (-EIO);
3131 } else {
3132 result = 0;
3133 if ((STp->device)->scsi_level < SCSI_2) {
3134 *block = ((STp->buffer)->b_data[0] << 16)
3135 + ((STp->buffer)->b_data[1] << 8)
3136 + (STp->buffer)->b_data[2];
3137 *partition = 0;
3138 } else {
3139 *block = ((STp->buffer)->b_data[4] << 24)
3140 + ((STp->buffer)->b_data[5] << 16)
3141 + ((STp->buffer)->b_data[6] << 8)
3142 + (STp->buffer)->b_data[7];
3143 *partition = (STp->buffer)->b_data[1];
3144 if (((STp->buffer)->b_data[0] & 0x80) &&
3145 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3146 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3147 }
3148 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3149 *block, *partition);
3150 }
3151 st_release_request(SRpnt);
3152 SRpnt = NULL;
3153
3154 return result;
3155 }
3156
3157
3158 /* Set the tape block and partition. Negative partition means that only the
3159 block should be set in vendor specific way. */
3160 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3161 int logical)
3162 {
3163 struct st_partstat *STps;
3164 int result, p;
3165 unsigned int blk;
3166 int timeout;
3167 unsigned char scmd[MAX_COMMAND_SIZE];
3168 struct st_request *SRpnt;
3169
3170 if (STp->ready != ST_READY)
3171 return (-EIO);
3172 timeout = STp->long_timeout;
3173 STps = &(STp->ps[STp->partition]);
3174
3175 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3176 block, partition);
3177 DEB(if (partition < 0)
3178 return (-EIO); )
3179
3180 /* Update the location at the partition we are leaving */
3181 if ((!STp->can_partitions && partition != 0) ||
3182 partition >= ST_NBR_PARTITIONS)
3183 return (-EINVAL);
3184 if (partition != STp->partition) {
3185 if (get_location(STp, &blk, &p, 1))
3186 STps->last_block_valid = 0;
3187 else {
3188 STps->last_block_valid = 1;
3189 STps->last_block_visited = blk;
3190 DEBC_printk(STp, "Visited block %d for "
3191 "partition %d saved.\n",
3192 blk, STp->partition);
3193 }
3194 }
3195
3196 memset(scmd, 0, MAX_COMMAND_SIZE);
3197 if ((STp->device)->scsi_level < SCSI_2) {
3198 scmd[0] = QFA_SEEK_BLOCK;
3199 scmd[2] = (block >> 16);
3200 scmd[3] = (block >> 8);
3201 scmd[4] = block;
3202 scmd[5] = 0;
3203 } else {
3204 scmd[0] = SEEK_10;
3205 scmd[3] = (block >> 24);
3206 scmd[4] = (block >> 16);
3207 scmd[5] = (block >> 8);
3208 scmd[6] = block;
3209 if (!logical && !STp->scsi2_logical)
3210 scmd[1] = 4;
3211 if (STp->partition != partition) {
3212 scmd[1] |= 2;
3213 scmd[8] = partition;
3214 DEBC_printk(STp, "Trying to change partition "
3215 "from %d to %d\n", STp->partition,
3216 partition);
3217 }
3218 }
3219 if (STp->immediate) {
3220 scmd[1] |= 1; /* Don't wait for completion */
3221 timeout = STp->device->request_queue->rq_timeout;
3222 }
3223
3224 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3225 timeout, MAX_READY_RETRIES, 1);
3226 if (!SRpnt)
3227 return (STp->buffer)->syscall_result;
3228
3229 STps->drv_block = STps->drv_file = (-1);
3230 STps->eof = ST_NOEOF;
3231 if ((STp->buffer)->syscall_result != 0) {
3232 result = (-EIO);
3233 if (STp->can_partitions &&
3234 (STp->device)->scsi_level >= SCSI_2 &&
3235 (p = find_partition(STp)) >= 0)
3236 STp->partition = p;
3237 } else {
3238 if (STp->can_partitions) {
3239 STp->partition = partition;
3240 STps = &(STp->ps[partition]);
3241 if (!STps->last_block_valid ||
3242 STps->last_block_visited != block) {
3243 STps->at_sm = 0;
3244 STps->rw = ST_IDLE;
3245 }
3246 } else
3247 STps->at_sm = 0;
3248 if (block == 0)
3249 STps->drv_block = STps->drv_file = 0;
3250 result = 0;
3251 }
3252
3253 st_release_request(SRpnt);
3254 SRpnt = NULL;
3255
3256 return result;
3257 }
3258
3259
3260 /* Find the current partition number for the drive status. Called from open and
3261 returns either partition number of negative error code. */
3262 static int find_partition(struct scsi_tape *STp)
3263 {
3264 int i, partition;
3265 unsigned int block;
3266
3267 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3268 return i;
3269 if (partition >= ST_NBR_PARTITIONS)
3270 return (-EIO);
3271 return partition;
3272 }
3273
3274
3275 /* Change the partition if necessary */
3276 static int switch_partition(struct scsi_tape *STp)
3277 {
3278 struct st_partstat *STps;
3279
3280 if (STp->partition == STp->new_partition)
3281 return 0;
3282 STps = &(STp->ps[STp->new_partition]);
3283 if (!STps->last_block_valid)
3284 STps->last_block_visited = 0;
3285 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3286 }
3287 \f
3288 /* Functions for reading and writing the medium partition mode page. */
3289
3290 #define PART_PAGE 0x11
3291 #define PART_PAGE_FIXED_LENGTH 8
3292
3293 #define PP_OFF_MAX_ADD_PARTS 2
3294 #define PP_OFF_NBR_ADD_PARTS 3
3295 #define PP_OFF_FLAGS 4
3296 #define PP_OFF_PART_UNITS 6
3297 #define PP_OFF_RESERVED 7
3298
3299 #define PP_BIT_IDP 0x20
3300 #define PP_BIT_FDP 0x80
3301 #define PP_MSK_PSUM_MB 0x10
3302 #define PP_MSK_PSUM_UNITS 0x18
3303 #define PP_MSK_POFM 0x04
3304
3305 /* Get the number of partitions on the tape. As a side effect reads the
3306 mode page into the tape buffer. */
3307 static int nbr_partitions(struct scsi_tape *STp)
3308 {
3309 int result;
3310
3311 if (STp->ready != ST_READY)
3312 return (-EIO);
3313
3314 result = read_mode_page(STp, PART_PAGE, 1);
3315
3316 if (result) {
3317 DEBC_printk(STp, "Can't read medium partition page.\n");
3318 result = (-EIO);
3319 } else {
3320 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3321 PP_OFF_NBR_ADD_PARTS] + 1;
3322 DEBC_printk(STp, "Number of partitions %d.\n", result);
3323 }
3324
3325 return result;
3326 }
3327
3328
3329 static int format_medium(struct scsi_tape *STp, int format)
3330 {
3331 int result = 0;
3332 int timeout = STp->long_timeout;
3333 unsigned char scmd[MAX_COMMAND_SIZE];
3334 struct st_request *SRpnt;
3335
3336 memset(scmd, 0, MAX_COMMAND_SIZE);
3337 scmd[0] = FORMAT_UNIT;
3338 scmd[2] = format;
3339 if (STp->immediate) {
3340 scmd[1] |= 1; /* Don't wait for completion */
3341 timeout = STp->device->request_queue->rq_timeout;
3342 }
3343 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3344 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3345 timeout, MAX_RETRIES, 1);
3346 if (!SRpnt)
3347 result = STp->buffer->syscall_result;
3348 return result;
3349 }
3350
3351
3352 /* Partition the tape into two partitions if size > 0 or one partition if
3353 size == 0.
3354
3355 The block descriptors are read and written because Sony SDT-7000 does not
3356 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3357
3358 My HP C1533A drive returns only one partition size field. This is used to
3359 set the size of partition 1. There is no size field for the default partition.
3360 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3361 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3362 The following algorithm is used to accommodate both drives: if the number of
3363 partition size fields is greater than the maximum number of additional partitions
3364 in the mode page, the second field is used. Otherwise the first field is used.
3365
3366 For Seagate DDS drives the page length must be 8 when no partitions is defined
3367 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3368 is acceptable also to some other old drives and enforced if the first partition
3369 size field is used for the first additional partition size.
3370
3371 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3372 */
3373 static int partition_tape(struct scsi_tape *STp, int size)
3374 {
3375 int result;
3376 int target_partition;
3377 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3378 int pgo, psd_cnt, psdo;
3379 int psum = PP_MSK_PSUM_MB, units = 0;
3380 unsigned char *bp;
3381
3382 result = read_mode_page(STp, PART_PAGE, 0);
3383 if (result) {
3384 DEBC_printk(STp, "Can't read partition mode page.\n");
3385 return result;
3386 }
3387 target_partition = 1;
3388 if (size < 0) {
3389 target_partition = 0;
3390 size = -size;
3391 }
3392
3393 /* The mode page is in the buffer. Let's modify it and write it. */
3394 bp = (STp->buffer)->b_data;
3395 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3396 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3397 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3398
3399 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3400
3401 if (scsi3) {
3402 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3403 if (needs_format && size == 0) {
3404 /* No need to write the mode page when clearing
3405 * partitioning
3406 */
3407 DEBC_printk(STp, "Formatting tape with one partition.\n");
3408 result = format_medium(STp, 0);
3409 goto out;
3410 }
3411 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3412 psd_cnt = 2;
3413 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3414 /* Use units scaling for large partitions if the device
3415 * suggests it and no precision lost. Required for IBM
3416 * TS1140/50 drives that don't support MB units.
3417 */
3418 if (size >= 1000 && (size % 1000) == 0) {
3419 size /= 1000;
3420 psum = PP_MSK_PSUM_UNITS;
3421 units = 9; /* GB */
3422 }
3423 }
3424 /* Try it anyway if too large to specify in MB */
3425 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3426 size /= 1000;
3427 psum = PP_MSK_PSUM_UNITS;
3428 units = 9; /* GB */
3429 }
3430 }
3431
3432 if (size >= 65535 || /* Does not fit into two bytes */
3433 (target_partition == 0 && psd_cnt < 2)) {
3434 result = -EINVAL;
3435 goto out;
3436 }
3437
3438 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3439 /* The second condition is for HP DDS which use only one partition size
3440 * descriptor
3441 */
3442 if (target_partition > 0 &&
3443 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3444 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3445 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3446 psdo += 2;
3447 }
3448 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3449
3450 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3451 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3452 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3453
3454 if (size == 0) {
3455 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3456 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3457 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3458 DEBC_printk(STp, "Formatting tape with one partition.\n");
3459 } else {
3460 bp[psdo] = (size >> 8) & 0xff;
3461 bp[psdo + 1] = size & 0xff;
3462 if (target_partition == 0)
3463 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3464 bp[pgo + 3] = 1;
3465 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3466 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3467 DEBC_printk(STp,
3468 "Formatting tape with two partitions (%i = %d MB).\n",
3469 target_partition, units > 0 ? size * 1000 : size);
3470 }
3471 bp[pgo + PP_OFF_PART_UNITS] = 0;
3472 bp[pgo + PP_OFF_RESERVED] = 0;
3473 if (size != 1 || units != 0) {
3474 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3475 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3476 bp[pgo + PP_OFF_PART_UNITS] = units;
3477 } else
3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3479 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3480 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3481
3482 result = write_mode_page(STp, PART_PAGE, 1);
3483
3484 if (!result && needs_format)
3485 result = format_medium(STp, 1);
3486
3487 if (result) {
3488 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3489 result = (-EIO);
3490 }
3491
3492 out:
3493 return result;
3494 }
3495 \f
3496
3497
3498 /* The ioctl command */
3499 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3500 {
3501 int i, cmd_nr, cmd_type, bt;
3502 int retval = 0;
3503 unsigned int blk;
3504 struct scsi_tape *STp = file->private_data;
3505 struct st_modedef *STm;
3506 struct st_partstat *STps;
3507 void __user *p = (void __user *)arg;
3508
3509 if (mutex_lock_interruptible(&STp->lock))
3510 return -ERESTARTSYS;
3511
3512 DEB(
3513 if (debugging && !STp->in_use) {
3514 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3515 retval = (-EIO);
3516 goto out;
3517 } ) /* end DEB */
3518
3519 STm = &(STp->modes[STp->current_mode]);
3520 STps = &(STp->ps[STp->partition]);
3521
3522 /*
3523 * If we are in the middle of error recovery, don't let anyone
3524 * else try and use this device. Also, if error recovery fails, it
3525 * may try and take the device offline, in which case all further
3526 * access to the device is prohibited.
3527 */
3528 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3529 file->f_flags & O_NDELAY);
3530 if (retval)
3531 goto out;
3532
3533 cmd_type = _IOC_TYPE(cmd_in);
3534 cmd_nr = _IOC_NR(cmd_in);
3535
3536 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3537 struct mtop mtc;
3538
3539 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3540 retval = (-EINVAL);
3541 goto out;
3542 }
3543
3544 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3545 if (i) {
3546 retval = (-EFAULT);
3547 goto out;
3548 }
3549
3550 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3551 st_printk(KERN_WARNING, STp,
3552 "MTSETDRVBUFFER only allowed for root.\n");
3553 retval = (-EPERM);
3554 goto out;
3555 }
3556 if (!STm->defined &&
3557 (mtc.mt_op != MTSETDRVBUFFER &&
3558 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3559 retval = (-ENXIO);
3560 goto out;
3561 }
3562
3563 if (!STp->pos_unknown) {
3564
3565 if (STps->eof == ST_FM_HIT) {
3566 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3567 mtc.mt_op == MTEOM) {
3568 mtc.mt_count -= 1;
3569 if (STps->drv_file >= 0)
3570 STps->drv_file += 1;
3571 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3572 mtc.mt_count += 1;
3573 if (STps->drv_file >= 0)
3574 STps->drv_file += 1;
3575 }
3576 }
3577
3578 if (mtc.mt_op == MTSEEK) {
3579 /* Old position must be restored if partition will be
3580 changed */
3581 i = !STp->can_partitions ||
3582 (STp->new_partition != STp->partition);
3583 } else {
3584 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3585 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3586 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3587 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3588 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3589 mtc.mt_op == MTCOMPRESSION;
3590 }
3591 i = flush_buffer(STp, i);
3592 if (i < 0) {
3593 retval = i;
3594 goto out;
3595 }
3596 if (STps->rw == ST_WRITING &&
3597 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3598 mtc.mt_op == MTSEEK ||
3599 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3600 i = st_int_ioctl(STp, MTWEOF, 1);
3601 if (i < 0) {
3602 retval = i;
3603 goto out;
3604 }
3605 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3606 mtc.mt_count++;
3607 STps->rw = ST_IDLE;
3608 }
3609
3610 } else {
3611 /*
3612 * If there was a bus reset, block further access
3613 * to this device. If the user wants to rewind the tape,
3614 * then reset the flag and allow access again.
3615 */
3616 if (mtc.mt_op != MTREW &&
3617 mtc.mt_op != MTOFFL &&
3618 mtc.mt_op != MTRETEN &&
3619 mtc.mt_op != MTERASE &&
3620 mtc.mt_op != MTSEEK &&
3621 mtc.mt_op != MTEOM) {
3622 retval = (-EIO);
3623 goto out;
3624 }
3625 reset_state(STp);
3626 /* remove this when the midlevel properly clears was_reset */
3627 STp->device->was_reset = 0;
3628 }
3629
3630 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3631 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3632 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3633 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3634
3635 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3636 do_door_lock(STp, 0); /* Ignore result! */
3637
3638 if (mtc.mt_op == MTSETDRVBUFFER &&
3639 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3640 retval = st_set_options(STp, mtc.mt_count);
3641 goto out;
3642 }
3643
3644 if (mtc.mt_op == MTSETPART) {
3645 if (!STp->can_partitions ||
3646 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3647 retval = (-EINVAL);
3648 goto out;
3649 }
3650 if (mtc.mt_count >= STp->nbr_partitions &&
3651 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3652 retval = (-EIO);
3653 goto out;
3654 }
3655 if (mtc.mt_count >= STp->nbr_partitions) {
3656 retval = (-EINVAL);
3657 goto out;
3658 }
3659 STp->new_partition = mtc.mt_count;
3660 retval = 0;
3661 goto out;
3662 }
3663
3664 if (mtc.mt_op == MTMKPART) {
3665 if (!STp->can_partitions) {
3666 retval = (-EINVAL);
3667 goto out;
3668 }
3669 i = do_load_unload(STp, file, 1);
3670 if (i < 0) {
3671 retval = i;
3672 goto out;
3673 }
3674 i = partition_tape(STp, mtc.mt_count);
3675 if (i < 0) {
3676 retval = i;
3677 goto out;
3678 }
3679 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3680 STp->ps[i].rw = ST_IDLE;
3681 STp->ps[i].at_sm = 0;
3682 STp->ps[i].last_block_valid = 0;
3683 }
3684 STp->partition = STp->new_partition = 0;
3685 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3686 STps->drv_block = STps->drv_file = 0;
3687 retval = 0;
3688 goto out;
3689 }
3690
3691 if (mtc.mt_op == MTSEEK) {
3692 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3693 if (!STp->can_partitions)
3694 STp->ps[0].rw = ST_IDLE;
3695 retval = i;
3696 goto out;
3697 }
3698
3699 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3700 retval = do_load_unload(STp, file, 0);
3701 goto out;
3702 }
3703
3704 if (mtc.mt_op == MTLOAD) {
3705 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3706 goto out;
3707 }
3708
3709 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3710 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3711 goto out;
3712 }
3713
3714 if (STp->can_partitions && STp->ready == ST_READY &&
3715 (i = switch_partition(STp)) < 0) {
3716 retval = i;
3717 goto out;
3718 }
3719
3720 if (mtc.mt_op == MTCOMPRESSION)
3721 retval = st_compression(STp, (mtc.mt_count & 1));
3722 else
3723 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3724 goto out;
3725 }
3726 if (!STm->defined) {
3727 retval = (-ENXIO);
3728 goto out;
3729 }
3730
3731 if ((i = flush_buffer(STp, 0)) < 0) {
3732 retval = i;
3733 goto out;
3734 }
3735 if (STp->can_partitions &&
3736 (i = switch_partition(STp)) < 0) {
3737 retval = i;
3738 goto out;
3739 }
3740
3741 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3742 struct mtget mt_status;
3743
3744 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3745 retval = (-EINVAL);
3746 goto out;
3747 }
3748
3749 mt_status.mt_type = STp->tape_type;
3750 mt_status.mt_dsreg =
3751 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3752 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3753 mt_status.mt_blkno = STps->drv_block;
3754 mt_status.mt_fileno = STps->drv_file;
3755 if (STp->block_size != 0) {
3756 if (STps->rw == ST_WRITING)
3757 mt_status.mt_blkno +=
3758 (STp->buffer)->buffer_bytes / STp->block_size;
3759 else if (STps->rw == ST_READING)
3760 mt_status.mt_blkno -=
3761 ((STp->buffer)->buffer_bytes +
3762 STp->block_size - 1) / STp->block_size;
3763 }
3764
3765 mt_status.mt_gstat = 0;
3766 if (STp->drv_write_prot)
3767 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3768 if (mt_status.mt_blkno == 0) {
3769 if (mt_status.mt_fileno == 0)
3770 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3771 else
3772 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3773 }
3774 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3775 mt_status.mt_resid = STp->partition;
3776 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3777 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3778 else if (STps->eof >= ST_EOM_OK)
3779 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3780 if (STp->density == 1)
3781 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3782 else if (STp->density == 2)
3783 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3784 else if (STp->density == 3)
3785 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3786 if (STp->ready == ST_READY)
3787 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3788 if (STp->ready == ST_NO_TAPE)
3789 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3790 if (STps->at_sm)
3791 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3792 if (STm->do_async_writes ||
3793 (STm->do_buffer_writes && STp->block_size != 0) ||
3794 STp->drv_buffer != 0)
3795 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3796 if (STp->cleaning_req)
3797 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3798
3799 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3800 if (i) {
3801 retval = (-EFAULT);
3802 goto out;
3803 }
3804
3805 STp->recover_reg = 0; /* Clear after read */
3806 retval = 0;
3807 goto out;
3808 } /* End of MTIOCGET */
3809 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3810 struct mtpos mt_pos;
3811 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3812 retval = (-EINVAL);
3813 goto out;
3814 }
3815 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3816 retval = i;
3817 goto out;
3818 }
3819 mt_pos.mt_blkno = blk;
3820 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3821 if (i)
3822 retval = (-EFAULT);
3823 goto out;
3824 }
3825 mutex_unlock(&STp->lock);
3826 switch (cmd_in) {
3827 case SCSI_IOCTL_GET_IDLUN:
3828 case SCSI_IOCTL_GET_BUS_NUMBER:
3829 break;
3830 default:
3831 if ((cmd_in == SG_IO ||
3832 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3833 cmd_in == CDROM_SEND_PACKET) &&
3834 !capable(CAP_SYS_RAWIO))
3835 i = -EPERM;
3836 else
3837 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3838 file->f_mode, cmd_in, p);
3839 if (i != -ENOTTY)
3840 return i;
3841 break;
3842 }
3843 retval = scsi_ioctl(STp->device, cmd_in, p);
3844 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3845 STp->rew_at_close = 0;
3846 STp->ready = ST_NO_TAPE;
3847 }
3848 return retval;
3849
3850 out:
3851 mutex_unlock(&STp->lock);
3852 return retval;
3853 }
3854
3855 #ifdef CONFIG_COMPAT
3856 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3857 {
3858 struct scsi_tape *STp = file->private_data;
3859 struct scsi_device *sdev = STp->device;
3860 int ret = -ENOIOCTLCMD;
3861 if (sdev->host->hostt->compat_ioctl) {
3862
3863 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3864
3865 }
3866 return ret;
3867 }
3868 #endif
3869
3870 \f
3871
3872 /* Try to allocate a new tape buffer. Calling function must not hold
3873 dev_arr_lock. */
3874 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3875 {
3876 struct st_buffer *tb;
3877
3878 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3879 if (!tb) {
3880 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3881 return NULL;
3882 }
3883 tb->frp_segs = 0;
3884 tb->use_sg = max_sg;
3885 tb->dma = need_dma;
3886 tb->buffer_size = 0;
3887
3888 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3889 GFP_KERNEL);
3890 if (!tb->reserved_pages) {
3891 kfree(tb);
3892 return NULL;
3893 }
3894
3895 return tb;
3896 }
3897
3898
3899 /* Try to allocate enough space in the tape buffer */
3900 #define ST_MAX_ORDER 6
3901
3902 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3903 {
3904 int segs, max_segs, b_size, order, got;
3905 gfp_t priority;
3906
3907 if (new_size <= STbuffer->buffer_size)
3908 return 1;
3909
3910 if (STbuffer->buffer_size <= PAGE_SIZE)
3911 normalize_buffer(STbuffer); /* Avoid extra segment */
3912
3913 max_segs = STbuffer->use_sg;
3914
3915 priority = GFP_KERNEL | __GFP_NOWARN;
3916 if (need_dma)
3917 priority |= GFP_DMA;
3918
3919 if (STbuffer->cleared)
3920 priority |= __GFP_ZERO;
3921
3922 if (STbuffer->frp_segs) {
3923 order = STbuffer->reserved_page_order;
3924 b_size = PAGE_SIZE << order;
3925 } else {
3926 for (b_size = PAGE_SIZE, order = 0;
3927 order < ST_MAX_ORDER &&
3928 max_segs * (PAGE_SIZE << order) < new_size;
3929 order++, b_size *= 2)
3930 ; /* empty */
3931 STbuffer->reserved_page_order = order;
3932 }
3933 if (max_segs * (PAGE_SIZE << order) < new_size) {
3934 if (order == ST_MAX_ORDER)
3935 return 0;
3936 normalize_buffer(STbuffer);
3937 return enlarge_buffer(STbuffer, new_size, need_dma);
3938 }
3939
3940 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3941 segs < max_segs && got < new_size;) {
3942 struct page *page;
3943
3944 page = alloc_pages(priority, order);
3945 if (!page) {
3946 DEB(STbuffer->buffer_size = got);
3947 normalize_buffer(STbuffer);
3948 return 0;
3949 }
3950
3951 STbuffer->frp_segs += 1;
3952 got += b_size;
3953 STbuffer->buffer_size = got;
3954 STbuffer->reserved_pages[segs] = page;
3955 segs++;
3956 }
3957 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3958
3959 return 1;
3960 }
3961
3962
3963 /* Make sure that no data from previous user is in the internal buffer */
3964 static void clear_buffer(struct st_buffer * st_bp)
3965 {
3966 int i;
3967
3968 for (i=0; i < st_bp->frp_segs; i++)
3969 memset(page_address(st_bp->reserved_pages[i]), 0,
3970 PAGE_SIZE << st_bp->reserved_page_order);
3971 st_bp->cleared = 1;
3972 }
3973
3974
3975 /* Release the extra buffer */
3976 static void normalize_buffer(struct st_buffer * STbuffer)
3977 {
3978 int i, order = STbuffer->reserved_page_order;
3979
3980 for (i = 0; i < STbuffer->frp_segs; i++) {
3981 __free_pages(STbuffer->reserved_pages[i], order);
3982 STbuffer->buffer_size -= (PAGE_SIZE << order);
3983 }
3984 STbuffer->frp_segs = 0;
3985 STbuffer->sg_segs = 0;
3986 STbuffer->reserved_page_order = 0;
3987 STbuffer->map_data.offset = 0;
3988 }
3989
3990
3991 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3992 negative error code. */
3993 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3994 {
3995 int i, cnt, res, offset;
3996 int length = PAGE_SIZE << st_bp->reserved_page_order;
3997
3998 for (i = 0, offset = st_bp->buffer_bytes;
3999 i < st_bp->frp_segs && offset >= length; i++)
4000 offset -= length;
4001 if (i == st_bp->frp_segs) { /* Should never happen */
4002 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4003 return (-EIO);
4004 }
4005 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4006 struct page *page = st_bp->reserved_pages[i];
4007 cnt = length - offset < do_count ? length - offset : do_count;
4008 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4009 if (res)
4010 return (-EFAULT);
4011 do_count -= cnt;
4012 st_bp->buffer_bytes += cnt;
4013 ubp += cnt;
4014 offset = 0;
4015 }
4016 if (do_count) /* Should never happen */
4017 return (-EIO);
4018
4019 return 0;
4020 }
4021
4022
4023 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4024 negative error code. */
4025 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4026 {
4027 int i, cnt, res, offset;
4028 int length = PAGE_SIZE << st_bp->reserved_page_order;
4029
4030 for (i = 0, offset = st_bp->read_pointer;
4031 i < st_bp->frp_segs && offset >= length; i++)
4032 offset -= length;
4033 if (i == st_bp->frp_segs) { /* Should never happen */
4034 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4035 return (-EIO);
4036 }
4037 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4038 struct page *page = st_bp->reserved_pages[i];
4039 cnt = length - offset < do_count ? length - offset : do_count;
4040 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4041 if (res)
4042 return (-EFAULT);
4043 do_count -= cnt;
4044 st_bp->buffer_bytes -= cnt;
4045 st_bp->read_pointer += cnt;
4046 ubp += cnt;
4047 offset = 0;
4048 }
4049 if (do_count) /* Should never happen */
4050 return (-EIO);
4051
4052 return 0;
4053 }
4054
4055
4056 /* Move data towards start of buffer */
4057 static void move_buffer_data(struct st_buffer * st_bp, int offset)
4058 {
4059 int src_seg, dst_seg, src_offset = 0, dst_offset;
4060 int count, total;
4061 int length = PAGE_SIZE << st_bp->reserved_page_order;
4062
4063 if (offset == 0)
4064 return;
4065
4066 total=st_bp->buffer_bytes - offset;
4067 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4068 src_offset = offset;
4069 if (src_offset < length)
4070 break;
4071 offset -= length;
4072 }
4073
4074 st_bp->buffer_bytes = st_bp->read_pointer = total;
4075 for (dst_seg=dst_offset=0; total > 0; ) {
4076 struct page *dpage = st_bp->reserved_pages[dst_seg];
4077 struct page *spage = st_bp->reserved_pages[src_seg];
4078
4079 count = min(length - dst_offset, length - src_offset);
4080 memmove(page_address(dpage) + dst_offset,
4081 page_address(spage) + src_offset, count);
4082 src_offset += count;
4083 if (src_offset >= length) {
4084 src_seg++;
4085 src_offset = 0;
4086 }
4087 dst_offset += count;
4088 if (dst_offset >= length) {
4089 dst_seg++;
4090 dst_offset = 0;
4091 }
4092 total -= count;
4093 }
4094 }
4095
4096 /* Validate the options from command line or module parameters */
4097 static void validate_options(void)
4098 {
4099 if (buffer_kbs > 0)
4100 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4101 if (max_sg_segs >= ST_FIRST_SG)
4102 st_max_sg_segs = max_sg_segs;
4103 }
4104
4105 #ifndef MODULE
4106 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4107 */
4108 static int __init st_setup(char *str)
4109 {
4110 int i, len, ints[5];
4111 char *stp;
4112
4113 stp = get_options(str, ARRAY_SIZE(ints), ints);
4114
4115 if (ints[0] > 0) {
4116 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4117 if (parms[i].val)
4118 *parms[i].val = ints[i + 1];
4119 } else {
4120 while (stp != NULL) {
4121 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4122 len = strlen(parms[i].name);
4123 if (!strncmp(stp, parms[i].name, len) &&
4124 (*(stp + len) == ':' || *(stp + len) == '=')) {
4125 if (parms[i].val)
4126 *parms[i].val =
4127 simple_strtoul(stp + len + 1, NULL, 0);
4128 else
4129 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4130 parms[i].name);
4131 break;
4132 }
4133 }
4134 if (i >= ARRAY_SIZE(parms))
4135 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4136 stp);
4137 stp = strchr(stp, ',');
4138 if (stp)
4139 stp++;
4140 }
4141 }
4142
4143 validate_options();
4144
4145 return 1;
4146 }
4147
4148 __setup("st=", st_setup);
4149
4150 #endif
4151
4152 static const struct file_operations st_fops =
4153 {
4154 .owner = THIS_MODULE,
4155 .read = st_read,
4156 .write = st_write,
4157 .unlocked_ioctl = st_ioctl,
4158 #ifdef CONFIG_COMPAT
4159 .compat_ioctl = st_compat_ioctl,
4160 #endif
4161 .open = st_open,
4162 .flush = st_flush,
4163 .release = st_release,
4164 .llseek = noop_llseek,
4165 };
4166
4167 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4168 {
4169 int i, error;
4170 dev_t cdev_devno;
4171 struct cdev *cdev;
4172 struct device *dev;
4173 struct st_modedef *STm = &(tape->modes[mode]);
4174 char name[10];
4175 int dev_num = tape->index;
4176
4177 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4178
4179 cdev = cdev_alloc();
4180 if (!cdev) {
4181 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4182 error = -ENOMEM;
4183 goto out;
4184 }
4185 cdev->owner = THIS_MODULE;
4186 cdev->ops = &st_fops;
4187 STm->cdevs[rew] = cdev;
4188
4189 error = cdev_add(cdev, cdev_devno, 1);
4190 if (error) {
4191 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4192 rew ? "non" : "auto", mode);
4193 pr_err("st%d: Device not attached.\n", dev_num);
4194 goto out_free;
4195 }
4196
4197 i = mode << (4 - ST_NBR_MODE_BITS);
4198 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4199 tape->disk->disk_name, st_formats[i]);
4200
4201 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4202 cdev_devno, &tape->modes[mode], "%s", name);
4203 if (IS_ERR(dev)) {
4204 pr_err("st%d: device_create failed\n", dev_num);
4205 error = PTR_ERR(dev);
4206 goto out_free;
4207 }
4208
4209 STm->devs[rew] = dev;
4210
4211 return 0;
4212 out_free:
4213 cdev_del(STm->cdevs[rew]);
4214 out:
4215 STm->cdevs[rew] = NULL;
4216 STm->devs[rew] = NULL;
4217 return error;
4218 }
4219
4220 static int create_cdevs(struct scsi_tape *tape)
4221 {
4222 int mode, error;
4223 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4224 error = create_one_cdev(tape, mode, 0);
4225 if (error)
4226 return error;
4227 error = create_one_cdev(tape, mode, 1);
4228 if (error)
4229 return error;
4230 }
4231
4232 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4233 &tape->modes[0].devs[0]->kobj, "tape");
4234 }
4235
4236 static void remove_cdevs(struct scsi_tape *tape)
4237 {
4238 int mode, rew;
4239 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4240 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4241 struct st_modedef *STm = &(tape->modes[mode]);
4242 for (rew = 0; rew < 2; rew++) {
4243 if (STm->cdevs[rew])
4244 cdev_del(STm->cdevs[rew]);
4245 if (STm->devs[rew])
4246 device_unregister(STm->devs[rew]);
4247 }
4248 }
4249 }
4250
4251 static int st_probe(struct device *dev)
4252 {
4253 struct scsi_device *SDp = to_scsi_device(dev);
4254 struct gendisk *disk = NULL;
4255 struct scsi_tape *tpnt = NULL;
4256 struct st_modedef *STm;
4257 struct st_partstat *STps;
4258 struct st_buffer *buffer;
4259 int i, error;
4260 char *stp;
4261
4262 if (SDp->type != TYPE_TAPE)
4263 return -ENODEV;
4264 if ((stp = st_incompatible(SDp))) {
4265 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4266 sdev_printk(KERN_INFO, SDp,
4267 "st: The suggested driver is %s.\n", stp);
4268 return -ENODEV;
4269 }
4270
4271 scsi_autopm_get_device(SDp);
4272 i = queue_max_segments(SDp->request_queue);
4273 if (st_max_sg_segs < i)
4274 i = st_max_sg_segs;
4275 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4276 if (buffer == NULL) {
4277 sdev_printk(KERN_ERR, SDp,
4278 "st: Can't allocate new tape buffer. "
4279 "Device not attached.\n");
4280 goto out;
4281 }
4282
4283 disk = alloc_disk(1);
4284 if (!disk) {
4285 sdev_printk(KERN_ERR, SDp,
4286 "st: out of memory. Device not attached.\n");
4287 goto out_buffer_free;
4288 }
4289
4290 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4291 if (tpnt == NULL) {
4292 sdev_printk(KERN_ERR, SDp,
4293 "st: Can't allocate device descriptor.\n");
4294 goto out_put_disk;
4295 }
4296 kref_init(&tpnt->kref);
4297 tpnt->disk = disk;
4298 disk->private_data = &tpnt->driver;
4299 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4300 * take queue reference that release_disk() expects. */
4301 if (!blk_get_queue(SDp->request_queue))
4302 goto out_put_disk;
4303 disk->queue = SDp->request_queue;
4304 tpnt->driver = &st_template;
4305
4306 tpnt->device = SDp;
4307 if (SDp->scsi_level <= 2)
4308 tpnt->tape_type = MT_ISSCSI1;
4309 else
4310 tpnt->tape_type = MT_ISSCSI2;
4311
4312 tpnt->buffer = buffer;
4313 tpnt->buffer->last_SRpnt = NULL;
4314
4315 tpnt->inited = 0;
4316 tpnt->dirty = 0;
4317 tpnt->in_use = 0;
4318 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4319 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4320 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4321 tpnt->density = 0;
4322 tpnt->do_auto_lock = ST_AUTO_LOCK;
4323 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4324 tpnt->can_partitions = 0;
4325 tpnt->two_fm = ST_TWO_FM;
4326 tpnt->fast_mteom = ST_FAST_MTEOM;
4327 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4328 tpnt->sili = ST_SILI;
4329 tpnt->immediate = ST_NOWAIT;
4330 tpnt->immediate_filemark = 0;
4331 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4332 tpnt->partition = 0;
4333 tpnt->new_partition = 0;
4334 tpnt->nbr_partitions = 0;
4335 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4336 tpnt->long_timeout = ST_LONG_TIMEOUT;
4337 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4338
4339 for (i = 0; i < ST_NBR_MODES; i++) {
4340 STm = &(tpnt->modes[i]);
4341 STm->defined = 0;
4342 STm->sysv = ST_SYSV;
4343 STm->defaults_for_writes = 0;
4344 STm->do_async_writes = ST_ASYNC_WRITES;
4345 STm->do_buffer_writes = ST_BUFFER_WRITES;
4346 STm->do_read_ahead = ST_READ_AHEAD;
4347 STm->default_compression = ST_DONT_TOUCH;
4348 STm->default_blksize = (-1); /* No forced size */
4349 STm->default_density = (-1); /* No forced density */
4350 STm->tape = tpnt;
4351 }
4352
4353 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4354 STps = &(tpnt->ps[i]);
4355 STps->rw = ST_IDLE;
4356 STps->eof = ST_NOEOF;
4357 STps->at_sm = 0;
4358 STps->last_block_valid = 0;
4359 STps->drv_block = (-1);
4360 STps->drv_file = (-1);
4361 }
4362
4363 tpnt->current_mode = 0;
4364 tpnt->modes[0].defined = 1;
4365
4366 tpnt->density_changed = tpnt->compression_changed =
4367 tpnt->blksize_changed = 0;
4368 mutex_init(&tpnt->lock);
4369
4370 idr_preload(GFP_KERNEL);
4371 spin_lock(&st_index_lock);
4372 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4373 spin_unlock(&st_index_lock);
4374 idr_preload_end();
4375 if (error < 0) {
4376 pr_warn("st: idr allocation failed: %d\n", error);
4377 goto out_put_queue;
4378 }
4379 tpnt->index = error;
4380 sprintf(disk->disk_name, "st%d", tpnt->index);
4381 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4382 if (tpnt->stats == NULL) {
4383 sdev_printk(KERN_ERR, SDp,
4384 "st: Can't allocate statistics.\n");
4385 goto out_idr_remove;
4386 }
4387
4388 dev_set_drvdata(dev, tpnt);
4389
4390
4391 error = create_cdevs(tpnt);
4392 if (error)
4393 goto out_remove_devs;
4394 scsi_autopm_put_device(SDp);
4395
4396 sdev_printk(KERN_NOTICE, SDp,
4397 "Attached scsi tape %s\n", tape_name(tpnt));
4398 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4399 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4400 queue_dma_alignment(SDp->request_queue) + 1);
4401
4402 return 0;
4403
4404 out_remove_devs:
4405 remove_cdevs(tpnt);
4406 kfree(tpnt->stats);
4407 out_idr_remove:
4408 spin_lock(&st_index_lock);
4409 idr_remove(&st_index_idr, tpnt->index);
4410 spin_unlock(&st_index_lock);
4411 out_put_queue:
4412 blk_put_queue(disk->queue);
4413 out_put_disk:
4414 put_disk(disk);
4415 kfree(tpnt);
4416 out_buffer_free:
4417 kfree(buffer);
4418 out:
4419 scsi_autopm_put_device(SDp);
4420 return -ENODEV;
4421 };
4422
4423
4424 static int st_remove(struct device *dev)
4425 {
4426 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4427 int index = tpnt->index;
4428
4429 scsi_autopm_get_device(to_scsi_device(dev));
4430 remove_cdevs(tpnt);
4431
4432 mutex_lock(&st_ref_mutex);
4433 kref_put(&tpnt->kref, scsi_tape_release);
4434 mutex_unlock(&st_ref_mutex);
4435 spin_lock(&st_index_lock);
4436 idr_remove(&st_index_idr, index);
4437 spin_unlock(&st_index_lock);
4438 return 0;
4439 }
4440
4441 /**
4442 * scsi_tape_release - Called to free the Scsi_Tape structure
4443 * @kref: pointer to embedded kref
4444 *
4445 * st_ref_mutex must be held entering this routine. Because it is
4446 * called on last put, you should always use the scsi_tape_get()
4447 * scsi_tape_put() helpers which manipulate the semaphore directly
4448 * and never do a direct kref_put().
4449 **/
4450 static void scsi_tape_release(struct kref *kref)
4451 {
4452 struct scsi_tape *tpnt = to_scsi_tape(kref);
4453 struct gendisk *disk = tpnt->disk;
4454
4455 tpnt->device = NULL;
4456
4457 if (tpnt->buffer) {
4458 normalize_buffer(tpnt->buffer);
4459 kfree(tpnt->buffer->reserved_pages);
4460 kfree(tpnt->buffer);
4461 }
4462
4463 disk->private_data = NULL;
4464 put_disk(disk);
4465 kfree(tpnt->stats);
4466 kfree(tpnt);
4467 return;
4468 }
4469
4470 static struct class st_sysfs_class = {
4471 .name = "scsi_tape",
4472 .dev_groups = st_dev_groups,
4473 };
4474
4475 static int __init init_st(void)
4476 {
4477 int err;
4478
4479 validate_options();
4480
4481 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4482 verstr, st_fixed_buffer_size, st_max_sg_segs);
4483
4484 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4485 if (debugging) {
4486 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4487 debugging);
4488 }
4489
4490 err = class_register(&st_sysfs_class);
4491 if (err) {
4492 pr_err("Unable register sysfs class for SCSI tapes\n");
4493 return err;
4494 }
4495
4496 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4497 ST_MAX_TAPE_ENTRIES, "st");
4498 if (err) {
4499 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4500 SCSI_TAPE_MAJOR);
4501 goto err_class;
4502 }
4503
4504 err = scsi_register_driver(&st_template.gendrv);
4505 if (err)
4506 goto err_chrdev;
4507
4508 return 0;
4509
4510 err_chrdev:
4511 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4512 ST_MAX_TAPE_ENTRIES);
4513 err_class:
4514 class_unregister(&st_sysfs_class);
4515 return err;
4516 }
4517
4518 static void __exit exit_st(void)
4519 {
4520 scsi_unregister_driver(&st_template.gendrv);
4521 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4522 ST_MAX_TAPE_ENTRIES);
4523 class_unregister(&st_sysfs_class);
4524 idr_destroy(&st_index_idr);
4525 printk(KERN_INFO "st: Unloaded.\n");
4526 }
4527
4528 module_init(init_st);
4529 module_exit(exit_st);
4530
4531
4532 /* The sysfs driver interface. Read-only at the moment */
4533 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4534 {
4535 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4536 }
4537 static DRIVER_ATTR_RO(try_direct_io);
4538
4539 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4540 {
4541 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4542 }
4543 static DRIVER_ATTR_RO(fixed_buffer_size);
4544
4545 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4546 {
4547 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4548 }
4549 static DRIVER_ATTR_RO(max_sg_segs);
4550
4551 static ssize_t version_show(struct device_driver *ddd, char *buf)
4552 {
4553 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4554 }
4555 static DRIVER_ATTR_RO(version);
4556
4557 #if DEBUG
4558 static ssize_t debug_flag_store(struct device_driver *ddp,
4559 const char *buf, size_t count)
4560 {
4561 /* We only care what the first byte of the data is the rest is unused.
4562 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4563 * other values have -EINVAL returned if they are passed in.
4564 */
4565 if (count > 0) {
4566 if (buf[0] == '0') {
4567 debugging = NO_DEBUG;
4568 return count;
4569 } else if (buf[0] == '1') {
4570 debugging = 1;
4571 return count;
4572 }
4573 }
4574 return -EINVAL;
4575 }
4576
4577 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4578 {
4579 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4580 }
4581 static DRIVER_ATTR_RW(debug_flag);
4582 #endif
4583
4584 static struct attribute *st_drv_attrs[] = {
4585 &driver_attr_try_direct_io.attr,
4586 &driver_attr_fixed_buffer_size.attr,
4587 &driver_attr_max_sg_segs.attr,
4588 &driver_attr_version.attr,
4589 #if DEBUG
4590 &driver_attr_debug_flag.attr,
4591 #endif
4592 NULL,
4593 };
4594 ATTRIBUTE_GROUPS(st_drv);
4595
4596 /* The sysfs simple class interface */
4597 static ssize_t
4598 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4599 {
4600 struct st_modedef *STm = dev_get_drvdata(dev);
4601 ssize_t l = 0;
4602
4603 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4604 return l;
4605 }
4606 static DEVICE_ATTR_RO(defined);
4607
4608 static ssize_t
4609 default_blksize_show(struct device *dev, struct device_attribute *attr,
4610 char *buf)
4611 {
4612 struct st_modedef *STm = dev_get_drvdata(dev);
4613 ssize_t l = 0;
4614
4615 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4616 return l;
4617 }
4618 static DEVICE_ATTR_RO(default_blksize);
4619
4620 static ssize_t
4621 default_density_show(struct device *dev, struct device_attribute *attr,
4622 char *buf)
4623 {
4624 struct st_modedef *STm = dev_get_drvdata(dev);
4625 ssize_t l = 0;
4626 char *fmt;
4627
4628 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4629 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4630 return l;
4631 }
4632 static DEVICE_ATTR_RO(default_density);
4633
4634 static ssize_t
4635 default_compression_show(struct device *dev, struct device_attribute *attr,
4636 char *buf)
4637 {
4638 struct st_modedef *STm = dev_get_drvdata(dev);
4639 ssize_t l = 0;
4640
4641 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4642 return l;
4643 }
4644 static DEVICE_ATTR_RO(default_compression);
4645
4646 static ssize_t
4647 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4648 {
4649 struct st_modedef *STm = dev_get_drvdata(dev);
4650 struct scsi_tape *STp = STm->tape;
4651 int options;
4652 ssize_t l = 0;
4653
4654 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4655 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4656 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4657 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4658 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4659 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4660 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4661 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4662 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4663 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4664 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4665 options |= STm->sysv ? MT_ST_SYSV : 0;
4666 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4667 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4668 options |= STp->sili ? MT_ST_SILI : 0;
4669
4670 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4671 return l;
4672 }
4673 static DEVICE_ATTR_RO(options);
4674
4675 /* Support for tape stats */
4676
4677 /**
4678 * read_cnt_show - return read count - count of reads made from tape drive
4679 * @dev: struct device
4680 * @attr: attribute structure
4681 * @buf: buffer to return formatted data in
4682 */
4683 static ssize_t read_cnt_show(struct device *dev,
4684 struct device_attribute *attr, char *buf)
4685 {
4686 struct st_modedef *STm = dev_get_drvdata(dev);
4687
4688 return sprintf(buf, "%lld",
4689 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4690 }
4691 static DEVICE_ATTR_RO(read_cnt);
4692
4693 /**
4694 * read_byte_cnt_show - return read byte count - tape drives
4695 * may use blocks less than 512 bytes this gives the raw byte count of
4696 * of data read from the tape drive.
4697 * @dev: struct device
4698 * @attr: attribute structure
4699 * @buf: buffer to return formatted data in
4700 */
4701 static ssize_t read_byte_cnt_show(struct device *dev,
4702 struct device_attribute *attr, char *buf)
4703 {
4704 struct st_modedef *STm = dev_get_drvdata(dev);
4705
4706 return sprintf(buf, "%lld",
4707 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4708 }
4709 static DEVICE_ATTR_RO(read_byte_cnt);
4710
4711 /**
4712 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4713 * @dev: struct device
4714 * @attr: attribute structure
4715 * @buf: buffer to return formatted data in
4716 */
4717 static ssize_t read_ns_show(struct device *dev,
4718 struct device_attribute *attr, char *buf)
4719 {
4720 struct st_modedef *STm = dev_get_drvdata(dev);
4721
4722 return sprintf(buf, "%lld",
4723 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4724 }
4725 static DEVICE_ATTR_RO(read_ns);
4726
4727 /**
4728 * write_cnt_show - write count - number of user calls
4729 * to write(2) that have written data to tape.
4730 * @dev: struct device
4731 * @attr: attribute structure
4732 * @buf: buffer to return formatted data in
4733 */
4734 static ssize_t write_cnt_show(struct device *dev,
4735 struct device_attribute *attr, char *buf)
4736 {
4737 struct st_modedef *STm = dev_get_drvdata(dev);
4738
4739 return sprintf(buf, "%lld",
4740 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4741 }
4742 static DEVICE_ATTR_RO(write_cnt);
4743
4744 /**
4745 * write_byte_cnt_show - write byte count - raw count of
4746 * bytes written to tape.
4747 * @dev: struct device
4748 * @attr: attribute structure
4749 * @buf: buffer to return formatted data in
4750 */
4751 static ssize_t write_byte_cnt_show(struct device *dev,
4752 struct device_attribute *attr, char *buf)
4753 {
4754 struct st_modedef *STm = dev_get_drvdata(dev);
4755
4756 return sprintf(buf, "%lld",
4757 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4758 }
4759 static DEVICE_ATTR_RO(write_byte_cnt);
4760
4761 /**
4762 * write_ns_show - write ns - number of nanoseconds waiting on write
4763 * requests to complete.
4764 * @dev: struct device
4765 * @attr: attribute structure
4766 * @buf: buffer to return formatted data in
4767 */
4768 static ssize_t write_ns_show(struct device *dev,
4769 struct device_attribute *attr, char *buf)
4770 {
4771 struct st_modedef *STm = dev_get_drvdata(dev);
4772
4773 return sprintf(buf, "%lld",
4774 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4775 }
4776 static DEVICE_ATTR_RO(write_ns);
4777
4778 /**
4779 * in_flight_show - number of I/Os currently in flight -
4780 * in most cases this will be either 0 or 1. It may be higher if someone
4781 * has also issued other SCSI commands such as via an ioctl.
4782 * @dev: struct device
4783 * @attr: attribute structure
4784 * @buf: buffer to return formatted data in
4785 */
4786 static ssize_t in_flight_show(struct device *dev,
4787 struct device_attribute *attr, char *buf)
4788 {
4789 struct st_modedef *STm = dev_get_drvdata(dev);
4790
4791 return sprintf(buf, "%lld",
4792 (long long)atomic64_read(&STm->tape->stats->in_flight));
4793 }
4794 static DEVICE_ATTR_RO(in_flight);
4795
4796 /**
4797 * io_ns_show - io wait ns - this is the number of ns spent
4798 * waiting on all I/O to complete. This includes tape movement commands
4799 * such as rewinding, seeking to end of file or tape, it also includes
4800 * read and write. To determine the time spent on tape movement
4801 * subtract the read and write ns from this value.
4802 * @dev: struct device
4803 * @attr: attribute structure
4804 * @buf: buffer to return formatted data in
4805 */
4806 static ssize_t io_ns_show(struct device *dev,
4807 struct device_attribute *attr, char *buf)
4808 {
4809 struct st_modedef *STm = dev_get_drvdata(dev);
4810
4811 return sprintf(buf, "%lld",
4812 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4813 }
4814 static DEVICE_ATTR_RO(io_ns);
4815
4816 /**
4817 * other_cnt_show - other io count - this is the number of
4818 * I/O requests other than read and write requests.
4819 * Typically these are tape movement requests but will include driver
4820 * tape movement. This includes only requests issued by the st driver.
4821 * @dev: struct device
4822 * @attr: attribute structure
4823 * @buf: buffer to return formatted data in
4824 */
4825 static ssize_t other_cnt_show(struct device *dev,
4826 struct device_attribute *attr, char *buf)
4827 {
4828 struct st_modedef *STm = dev_get_drvdata(dev);
4829
4830 return sprintf(buf, "%lld",
4831 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4832 }
4833 static DEVICE_ATTR_RO(other_cnt);
4834
4835 /**
4836 * resid_cnt_show - A count of the number of times we get a residual
4837 * count - this should indicate someone issuing reads larger than the
4838 * block size on tape.
4839 * @dev: struct device
4840 * @attr: attribute structure
4841 * @buf: buffer to return formatted data in
4842 */
4843 static ssize_t resid_cnt_show(struct device *dev,
4844 struct device_attribute *attr, char *buf)
4845 {
4846 struct st_modedef *STm = dev_get_drvdata(dev);
4847
4848 return sprintf(buf, "%lld",
4849 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4850 }
4851 static DEVICE_ATTR_RO(resid_cnt);
4852
4853 static struct attribute *st_dev_attrs[] = {
4854 &dev_attr_defined.attr,
4855 &dev_attr_default_blksize.attr,
4856 &dev_attr_default_density.attr,
4857 &dev_attr_default_compression.attr,
4858 &dev_attr_options.attr,
4859 NULL,
4860 };
4861
4862 static struct attribute *st_stats_attrs[] = {
4863 &dev_attr_read_cnt.attr,
4864 &dev_attr_read_byte_cnt.attr,
4865 &dev_attr_read_ns.attr,
4866 &dev_attr_write_cnt.attr,
4867 &dev_attr_write_byte_cnt.attr,
4868 &dev_attr_write_ns.attr,
4869 &dev_attr_in_flight.attr,
4870 &dev_attr_io_ns.attr,
4871 &dev_attr_other_cnt.attr,
4872 &dev_attr_resid_cnt.attr,
4873 NULL,
4874 };
4875
4876 static struct attribute_group stats_group = {
4877 .name = "stats",
4878 .attrs = st_stats_attrs,
4879 };
4880
4881 static struct attribute_group st_group = {
4882 .attrs = st_dev_attrs,
4883 };
4884
4885 static const struct attribute_group *st_dev_groups[] = {
4886 &st_group,
4887 &stats_group,
4888 NULL,
4889 };
4890
4891 /* The following functions may be useful for a larger audience. */
4892 static int sgl_map_user_pages(struct st_buffer *STbp,
4893 const unsigned int max_pages, unsigned long uaddr,
4894 size_t count, int rw)
4895 {
4896 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4897 unsigned long start = uaddr >> PAGE_SHIFT;
4898 const int nr_pages = end - start;
4899 int res, i, j;
4900 struct page **pages;
4901 struct rq_map_data *mdata = &STbp->map_data;
4902
4903 /* User attempted Overflow! */
4904 if ((uaddr + count) < uaddr)
4905 return -EINVAL;
4906
4907 /* Too big */
4908 if (nr_pages > max_pages)
4909 return -ENOMEM;
4910
4911 /* Hmm? */
4912 if (count == 0)
4913 return 0;
4914
4915 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4916 if (pages == NULL)
4917 return -ENOMEM;
4918
4919 /* Try to fault in all of the necessary pages */
4920 /* rw==READ means read from drive, write into memory area */
4921 res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages);
4922
4923 /* Errors and no page mapped should return here */
4924 if (res < nr_pages)
4925 goto out_unmap;
4926
4927 for (i=0; i < nr_pages; i++) {
4928 /* FIXME: flush superflous for rw==READ,
4929 * probably wrong function for rw==WRITE
4930 */
4931 flush_dcache_page(pages[i]);
4932 }
4933
4934 mdata->offset = uaddr & ~PAGE_MASK;
4935 STbp->mapped_pages = pages;
4936
4937 return nr_pages;
4938 out_unmap:
4939 if (res > 0) {
4940 for (j=0; j < res; j++)
4941 put_page(pages[j]);
4942 res = 0;
4943 }
4944 kfree(pages);
4945 return res;
4946 }
4947
4948
4949 /* And unmap them... */
4950 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4951 const unsigned int nr_pages, int dirtied)
4952 {
4953 int i;
4954
4955 for (i=0; i < nr_pages; i++) {
4956 struct page *page = STbp->mapped_pages[i];
4957
4958 if (dirtied)
4959 SetPageDirty(page);
4960 /* FIXME: cache flush missing for rw==READ
4961 * FIXME: call the correct reference counting function
4962 */
4963 put_page(page);
4964 }
4965 kfree(STbp->mapped_pages);
4966 STbp->mapped_pages = NULL;
4967
4968 return 0;
4969 }
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