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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / scsi / st.c
blob393f3019ccac03e770501bcd8e6295f6cce5546e
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
4 file Documentation/scsi/st.txt for more information.
5
6 History:
7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
8 Contribution and ideas from several people including (in alphabetical
9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
11 Michael Schaefer, J"org Weule, and Eric Youngdale.
12
13 Copyright 1992 - 2016 Kai Makisara
14 email Kai.Makisara@kolumbus.fi
15
16 Some small formal changes - aeb, 950809
17
18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
19 */
20
21 static const char *verstr = "20160209";
22
23 #include <linux/module.h>
24
25 #include <linux/compat.h>
26 #include <linux/fs.h>
27 #include <linux/kernel.h>
28 #include <linux/sched/signal.h>
29 #include <linux/mm.h>
30 #include <linux/init.h>
31 #include <linux/string.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/mtio.h>
35 #include <linux/cdrom.h>
36 #include <linux/ioctl.h>
37 #include <linux/fcntl.h>
38 #include <linux/spinlock.h>
39 #include <linux/blkdev.h>
40 #include <linux/moduleparam.h>
41 #include <linux/cdev.h>
42 #include <linux/idr.h>
43 #include <linux/delay.h>
44 #include <linux/mutex.h>
45
46 #include <linux/uaccess.h>
47 #include <asm/dma.h>
48
49 #include <scsi/scsi.h>
50 #include <scsi/scsi_dbg.h>
51 #include <scsi/scsi_device.h>
52 #include <scsi/scsi_driver.h>
53 #include <scsi/scsi_eh.h>
54 #include <scsi/scsi_host.h>
55 #include <scsi/scsi_ioctl.h>
56 #include <scsi/sg.h>
57
58
59 /* The driver prints some debugging information on the console if DEBUG
60 is defined and non-zero. */
61 #define DEBUG 1
62 #define NO_DEBUG 0
63
64 #define ST_DEB_MSG KERN_NOTICE
65 #if DEBUG
66 /* The message level for the debug messages is currently set to KERN_NOTICE
67 so that people can easily see the messages. Later when the debugging messages
68 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
69 #define DEB(a) a
70 #define DEBC(a) if (debugging) { a ; }
71 #else
72 #define DEB(a)
73 #define DEBC(a)
74 #endif
75
76 #define ST_KILOBYTE 1024
77
78 #include "st_options.h"
79 #include "st.h"
80
81 static int buffer_kbs;
82 static int max_sg_segs;
83 static int try_direct_io = TRY_DIRECT_IO;
84 static int try_rdio = 1;
85 static int try_wdio = 1;
86 static int debug_flag;
87
88 static struct class st_sysfs_class;
89 static const struct attribute_group *st_dev_groups[];
90 static const struct attribute_group *st_drv_groups[];
91
92 MODULE_AUTHOR("Kai Makisara");
93 MODULE_DESCRIPTION("SCSI tape (st) driver");
94 MODULE_LICENSE("GPL");
95 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
96 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
97
98 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
99 * of sysfs parameters (which module_param doesn't yet support).
100 * Sysfs parameters defined explicitly later.
101 */
102 module_param_named(buffer_kbs, buffer_kbs, int, 0);
103 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
104 module_param_named(max_sg_segs, max_sg_segs, int, 0);
105 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
106 module_param_named(try_direct_io, try_direct_io, int, 0);
107 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
108 module_param_named(debug_flag, debug_flag, int, 0);
109 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
110
111
112 /* Extra parameters for testing */
113 module_param_named(try_rdio, try_rdio, int, 0);
114 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
115 module_param_named(try_wdio, try_wdio, int, 0);
116 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
117
118 #ifndef MODULE
119 static int write_threshold_kbs; /* retained for compatibility */
120 static struct st_dev_parm {
121 char *name;
122 int *val;
123 } parms[] __initdata = {
124 {
125 "buffer_kbs", &buffer_kbs
126 },
127 { /* Retained for compatibility with 2.4 */
128 "write_threshold_kbs", &write_threshold_kbs
129 },
130 {
131 "max_sg_segs", NULL
132 },
133 {
134 "try_direct_io", &try_direct_io
135 },
136 {
137 "debug_flag", &debug_flag
138 }
139 };
140 #endif
141
142 /* Restrict the number of modes so that names for all are assigned */
143 #if ST_NBR_MODES > 16
144 #error "Maximum number of modes is 16"
145 #endif
146 /* Bit reversed order to get same names for same minors with all
147 mode counts */
148 static const char *st_formats[] = {
149 "", "r", "k", "s", "l", "t", "o", "u",
150 "m", "v", "p", "x", "a", "y", "q", "z"};
151
152 /* The default definitions have been moved to st_options.h */
153
154 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
155
156 /* The buffer size should fit into the 24 bits for length in the
157 6-byte SCSI read and write commands. */
158 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
159 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
160 #endif
161
162 static int debugging = DEBUG;
163
164 #define MAX_RETRIES 0
165 #define MAX_WRITE_RETRIES 0
166 #define MAX_READY_RETRIES 0
167 #define NO_TAPE NOT_READY
168
169 #define ST_TIMEOUT (900 * HZ)
170 #define ST_LONG_TIMEOUT (14000 * HZ)
171
172 /* Remove mode bits and auto-rewind bit (7) */
173 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
174 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
175 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
176
177 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
178 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
179 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
180
181 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
182 24 bits) */
183 #define SET_DENS_AND_BLK 0x10001
184
185 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
186 static int st_max_sg_segs = ST_MAX_SG;
187
188 static int modes_defined;
189
190 static int enlarge_buffer(struct st_buffer *, int, int);
191 static void clear_buffer(struct st_buffer *);
192 static void normalize_buffer(struct st_buffer *);
193 static int append_to_buffer(const char __user *, struct st_buffer *, int);
194 static int from_buffer(struct st_buffer *, char __user *, int);
195 static void move_buffer_data(struct st_buffer *, int);
196
197 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
198 unsigned long, size_t, int);
199 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
200
201 static int st_probe(struct device *);
202 static int st_remove(struct device *);
203
204 static struct scsi_driver st_template = {
205 .gendrv = {
206 .name = "st",
207 .owner = THIS_MODULE,
208 .probe = st_probe,
209 .remove = st_remove,
210 .groups = st_drv_groups,
211 },
212 };
213
214 static int st_compression(struct scsi_tape *, int);
215
216 static int find_partition(struct scsi_tape *);
217 static int switch_partition(struct scsi_tape *);
218
219 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
220
221 static void scsi_tape_release(struct kref *);
222
223 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
224
225 static DEFINE_MUTEX(st_ref_mutex);
226 static DEFINE_SPINLOCK(st_index_lock);
227 static DEFINE_SPINLOCK(st_use_lock);
228 static DEFINE_IDR(st_index_idr);
229
230
231 \f
232 #ifndef SIGS_FROM_OSST
233 #define SIGS_FROM_OSST \
234 {"OnStream", "SC-", "", "osst"}, \
235 {"OnStream", "DI-", "", "osst"}, \
236 {"OnStream", "DP-", "", "osst"}, \
237 {"OnStream", "USB", "", "osst"}, \
238 {"OnStream", "FW-", "", "osst"}
239 #endif
240
241 static struct scsi_tape *scsi_tape_get(int dev)
242 {
243 struct scsi_tape *STp = NULL;
244
245 mutex_lock(&st_ref_mutex);
246 spin_lock(&st_index_lock);
247
248 STp = idr_find(&st_index_idr, dev);
249 if (!STp) goto out;
250
251 kref_get(&STp->kref);
252
253 if (!STp->device)
254 goto out_put;
255
256 if (scsi_device_get(STp->device))
257 goto out_put;
258
259 goto out;
260
261 out_put:
262 kref_put(&STp->kref, scsi_tape_release);
263 STp = NULL;
264 out:
265 spin_unlock(&st_index_lock);
266 mutex_unlock(&st_ref_mutex);
267 return STp;
268 }
269
270 static void scsi_tape_put(struct scsi_tape *STp)
271 {
272 struct scsi_device *sdev = STp->device;
273
274 mutex_lock(&st_ref_mutex);
275 kref_put(&STp->kref, scsi_tape_release);
276 scsi_device_put(sdev);
277 mutex_unlock(&st_ref_mutex);
278 }
279
280 struct st_reject_data {
281 char *vendor;
282 char *model;
283 char *rev;
284 char *driver_hint; /* Name of the correct driver, NULL if unknown */
285 };
286
287 static struct st_reject_data reject_list[] = {
288 /* {"XXX", "Yy-", "", NULL}, example */
289 SIGS_FROM_OSST,
290 {NULL, }};
291
292 /* If the device signature is on the list of incompatible drives, the
293 function returns a pointer to the name of the correct driver (if known) */
294 static char * st_incompatible(struct scsi_device* SDp)
295 {
296 struct st_reject_data *rp;
297
298 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
299 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
300 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
301 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
302 if (rp->driver_hint)
303 return rp->driver_hint;
304 else
305 return "unknown";
306 }
307 return NULL;
308 }
309 \f
310
311 static inline char *tape_name(struct scsi_tape *tape)
312 {
313 return tape->disk->disk_name;
314 }
315
316 #define st_printk(prefix, t, fmt, a...) \
317 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
318 #ifdef DEBUG
319 #define DEBC_printk(t, fmt, a...) \
320 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
321 #else
322 #define DEBC_printk(t, fmt, a...)
323 #endif
324
325 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
326 {
327 const u8 *ucp;
328 const u8 *sense = SRpnt->sense;
329
330 s->have_sense = scsi_normalize_sense(SRpnt->sense,
331 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
332 s->flags = 0;
333
334 if (s->have_sense) {
335 s->deferred = 0;
336 s->remainder_valid =
337 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
338 switch (sense[0] & 0x7f) {
339 case 0x71:
340 s->deferred = 1;
341 /* fall through */
342 case 0x70:
343 s->fixed_format = 1;
344 s->flags = sense[2] & 0xe0;
345 break;
346 case 0x73:
347 s->deferred = 1;
348 /* fall through */
349 case 0x72:
350 s->fixed_format = 0;
351 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
352 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
353 break;
354 }
355 }
356 }
357
358
359 /* Convert the result to success code */
360 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
361 {
362 int result = SRpnt->result;
363 u8 scode;
364 DEB(const char *stp;)
365 char *name = tape_name(STp);
366 struct st_cmdstatus *cmdstatp;
367
368 if (!result)
369 return 0;
370
371 cmdstatp = &STp->buffer->cmdstat;
372 st_analyze_sense(SRpnt, cmdstatp);
373
374 if (cmdstatp->have_sense)
375 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
376 else
377 scode = 0;
378
379 DEB(
380 if (debugging) {
381 st_printk(ST_DEB_MSG, STp,
382 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
383 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
384 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
385 if (cmdstatp->have_sense)
386 __scsi_print_sense(STp->device, name,
387 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
388 } ) /* end DEB */
389 if (!debugging) { /* Abnormal conditions for tape */
390 if (!cmdstatp->have_sense)
391 st_printk(KERN_WARNING, STp,
392 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
393 result, driver_byte(result), host_byte(result));
394 else if (cmdstatp->have_sense &&
395 scode != NO_SENSE &&
396 scode != RECOVERED_ERROR &&
397 /* scode != UNIT_ATTENTION && */
398 scode != BLANK_CHECK &&
399 scode != VOLUME_OVERFLOW &&
400 SRpnt->cmd[0] != MODE_SENSE &&
401 SRpnt->cmd[0] != TEST_UNIT_READY) {
402
403 __scsi_print_sense(STp->device, name,
404 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
405 }
406 }
407
408 if (cmdstatp->fixed_format &&
409 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
410 if (STp->cln_sense_value)
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) == STp->cln_sense_value);
413 else
414 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
415 STp->cln_sense_mask) != 0);
416 }
417 if (cmdstatp->have_sense &&
418 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
419 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
420
421 STp->pos_unknown |= STp->device->was_reset;
422
423 if (cmdstatp->have_sense &&
424 scode == RECOVERED_ERROR
425 #if ST_RECOVERED_WRITE_FATAL
426 && SRpnt->cmd[0] != WRITE_6
427 && SRpnt->cmd[0] != WRITE_FILEMARKS
428 #endif
429 ) {
430 STp->recover_count++;
431 STp->recover_reg++;
432
433 DEB(
434 if (debugging) {
435 if (SRpnt->cmd[0] == READ_6)
436 stp = "read";
437 else if (SRpnt->cmd[0] == WRITE_6)
438 stp = "write";
439 else
440 stp = "ioctl";
441 st_printk(ST_DEB_MSG, STp,
442 "Recovered %s error (%d).\n",
443 stp, STp->recover_count);
444 } ) /* end DEB */
445
446 if (cmdstatp->flags == 0)
447 return 0;
448 }
449 return (-EIO);
450 }
451
452 static struct st_request *st_allocate_request(struct scsi_tape *stp)
453 {
454 struct st_request *streq;
455
456 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
457 if (streq)
458 streq->stp = stp;
459 else {
460 st_printk(KERN_ERR, stp,
461 "Can't get SCSI request.\n");
462 if (signal_pending(current))
463 stp->buffer->syscall_result = -EINTR;
464 else
465 stp->buffer->syscall_result = -EBUSY;
466 }
467
468 return streq;
469 }
470
471 static void st_release_request(struct st_request *streq)
472 {
473 kfree(streq);
474 }
475
476 static void st_do_stats(struct scsi_tape *STp, struct request *req)
477 {
478 ktime_t now;
479
480 now = ktime_get();
481 if (scsi_req(req)->cmd[0] == WRITE_6) {
482 now = ktime_sub(now, STp->stats->write_time);
483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
485 atomic64_inc(&STp->stats->write_cnt);
486 if (scsi_req(req)->result) {
487 atomic64_add(atomic_read(&STp->stats->last_write_size)
488 - STp->buffer->cmdstat.residual,
489 &STp->stats->write_byte_cnt);
490 if (STp->buffer->cmdstat.residual > 0)
491 atomic64_inc(&STp->stats->resid_cnt);
492 } else
493 atomic64_add(atomic_read(&STp->stats->last_write_size),
494 &STp->stats->write_byte_cnt);
495 } else if (scsi_req(req)->cmd[0] == READ_6) {
496 now = ktime_sub(now, STp->stats->read_time);
497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
499 atomic64_inc(&STp->stats->read_cnt);
500 if (scsi_req(req)->result) {
501 atomic64_add(atomic_read(&STp->stats->last_read_size)
502 - STp->buffer->cmdstat.residual,
503 &STp->stats->read_byte_cnt);
504 if (STp->buffer->cmdstat.residual > 0)
505 atomic64_inc(&STp->stats->resid_cnt);
506 } else
507 atomic64_add(atomic_read(&STp->stats->last_read_size),
508 &STp->stats->read_byte_cnt);
509 } else {
510 now = ktime_sub(now, STp->stats->other_time);
511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
512 atomic64_inc(&STp->stats->other_cnt);
513 }
514 atomic64_dec(&STp->stats->in_flight);
515 }
516
517 static void st_scsi_execute_end(struct request *req, blk_status_t status)
518 {
519 struct st_request *SRpnt = req->end_io_data;
520 struct scsi_request *rq = scsi_req(req);
521 struct scsi_tape *STp = SRpnt->stp;
522 struct bio *tmp;
523
524 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
525 STp->buffer->cmdstat.residual = rq->resid_len;
526
527 st_do_stats(STp, req);
528
529 tmp = SRpnt->bio;
530 if (rq->sense_len)
531 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
532 if (SRpnt->waiting)
533 complete(SRpnt->waiting);
534
535 blk_rq_unmap_user(tmp);
536 blk_put_request(req);
537 }
538
539 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
540 int data_direction, void *buffer, unsigned bufflen,
541 int timeout, int retries)
542 {
543 struct request *req;
544 struct scsi_request *rq;
545 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
546 int err = 0;
547 struct scsi_tape *STp = SRpnt->stp;
548
549 req = blk_get_request(SRpnt->stp->device->request_queue,
550 data_direction == DMA_TO_DEVICE ?
551 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
552 if (IS_ERR(req))
553 return DRIVER_ERROR << 24;
554 rq = scsi_req(req);
555 req->rq_flags |= RQF_QUIET;
556
557 mdata->null_mapped = 1;
558
559 if (bufflen) {
560 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
561 GFP_KERNEL);
562 if (err) {
563 blk_put_request(req);
564 return DRIVER_ERROR << 24;
565 }
566 }
567
568 atomic64_inc(&STp->stats->in_flight);
569 if (cmd[0] == WRITE_6) {
570 atomic_set(&STp->stats->last_write_size, bufflen);
571 STp->stats->write_time = ktime_get();
572 } else if (cmd[0] == READ_6) {
573 atomic_set(&STp->stats->last_read_size, bufflen);
574 STp->stats->read_time = ktime_get();
575 } else {
576 STp->stats->other_time = ktime_get();
577 }
578
579 SRpnt->bio = req->bio;
580 rq->cmd_len = COMMAND_SIZE(cmd[0]);
581 memset(rq->cmd, 0, BLK_MAX_CDB);
582 memcpy(rq->cmd, cmd, rq->cmd_len);
583 req->timeout = timeout;
584 rq->retries = retries;
585 req->end_io_data = SRpnt;
586
587 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
588 return 0;
589 }
590
591 /* Do the scsi command. Waits until command performed if do_wait is true.
592 Otherwise write_behind_check() is used to check that the command
593 has finished. */
594 static struct st_request *
595 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
596 int bytes, int direction, int timeout, int retries, int do_wait)
597 {
598 struct completion *waiting;
599 struct rq_map_data *mdata = &STp->buffer->map_data;
600 int ret;
601
602 /* if async, make sure there's no command outstanding */
603 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
604 st_printk(KERN_ERR, STp,
605 "Async command already active.\n");
606 if (signal_pending(current))
607 (STp->buffer)->syscall_result = (-EINTR);
608 else
609 (STp->buffer)->syscall_result = (-EBUSY);
610 return NULL;
611 }
612
613 if (!SRpnt) {
614 SRpnt = st_allocate_request(STp);
615 if (!SRpnt)
616 return NULL;
617 }
618
619 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
620 which IO is outstanding. It's nulled out when the IO completes. */
621 if (!do_wait)
622 (STp->buffer)->last_SRpnt = SRpnt;
623
624 waiting = &STp->wait;
625 init_completion(waiting);
626 SRpnt->waiting = waiting;
627
628 if (STp->buffer->do_dio) {
629 mdata->page_order = 0;
630 mdata->nr_entries = STp->buffer->sg_segs;
631 mdata->pages = STp->buffer->mapped_pages;
632 } else {
633 mdata->page_order = STp->buffer->reserved_page_order;
634 mdata->nr_entries =
635 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
636 mdata->pages = STp->buffer->reserved_pages;
637 mdata->offset = 0;
638 }
639
640 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
641 STp->buffer->cmdstat.have_sense = 0;
642 STp->buffer->syscall_result = 0;
643
644 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
645 retries);
646 if (ret) {
647 /* could not allocate the buffer or request was too large */
648 (STp->buffer)->syscall_result = (-EBUSY);
649 (STp->buffer)->last_SRpnt = NULL;
650 } else if (do_wait) {
651 wait_for_completion(waiting);
652 SRpnt->waiting = NULL;
653 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
654 }
655
656 return SRpnt;
657 }
658
659
660 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
661 write has been correct but EOM early warning reached, -EIO if write ended in
662 error or zero if write successful. Asynchronous writes are used only in
663 variable block mode. */
664 static int write_behind_check(struct scsi_tape * STp)
665 {
666 int retval = 0;
667 struct st_buffer *STbuffer;
668 struct st_partstat *STps;
669 struct st_cmdstatus *cmdstatp;
670 struct st_request *SRpnt;
671
672 STbuffer = STp->buffer;
673 if (!STbuffer->writing)
674 return 0;
675
676 DEB(
677 if (STp->write_pending)
678 STp->nbr_waits++;
679 else
680 STp->nbr_finished++;
681 ) /* end DEB */
682
683 wait_for_completion(&(STp->wait));
684 SRpnt = STbuffer->last_SRpnt;
685 STbuffer->last_SRpnt = NULL;
686 SRpnt->waiting = NULL;
687
688 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
689 st_release_request(SRpnt);
690
691 STbuffer->buffer_bytes -= STbuffer->writing;
692 STps = &(STp->ps[STp->partition]);
693 if (STps->drv_block >= 0) {
694 if (STp->block_size == 0)
695 STps->drv_block++;
696 else
697 STps->drv_block += STbuffer->writing / STp->block_size;
698 }
699
700 cmdstatp = &STbuffer->cmdstat;
701 if (STbuffer->syscall_result) {
702 retval = -EIO;
703 if (cmdstatp->have_sense && !cmdstatp->deferred &&
704 (cmdstatp->flags & SENSE_EOM) &&
705 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
706 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
707 /* EOM at write-behind, has all data been written? */
708 if (!cmdstatp->remainder_valid ||
709 cmdstatp->uremainder64 == 0)
710 retval = -ENOSPC;
711 }
712 if (retval == -EIO)
713 STps->drv_block = -1;
714 }
715 STbuffer->writing = 0;
716
717 DEB(if (debugging && retval)
718 st_printk(ST_DEB_MSG, STp,
719 "Async write error %x, return value %d.\n",
720 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
721
722 return retval;
723 }
724
725
726 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
727 it messes up the block number). */
728 static int cross_eof(struct scsi_tape * STp, int forward)
729 {
730 struct st_request *SRpnt;
731 unsigned char cmd[MAX_COMMAND_SIZE];
732
733 cmd[0] = SPACE;
734 cmd[1] = 0x01; /* Space FileMarks */
735 if (forward) {
736 cmd[2] = cmd[3] = 0;
737 cmd[4] = 1;
738 } else
739 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
740 cmd[5] = 0;
741
742 DEBC_printk(STp, "Stepping over filemark %s.\n",
743 forward ? "forward" : "backward");
744
745 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
746 STp->device->request_queue->rq_timeout,
747 MAX_RETRIES, 1);
748 if (!SRpnt)
749 return (STp->buffer)->syscall_result;
750
751 st_release_request(SRpnt);
752 SRpnt = NULL;
753
754 if ((STp->buffer)->cmdstat.midlevel_result != 0)
755 st_printk(KERN_ERR, STp,
756 "Stepping over filemark %s failed.\n",
757 forward ? "forward" : "backward");
758
759 return (STp->buffer)->syscall_result;
760 }
761
762
763 /* Flush the write buffer (never need to write if variable blocksize). */
764 static int st_flush_write_buffer(struct scsi_tape * STp)
765 {
766 int transfer, blks;
767 int result;
768 unsigned char cmd[MAX_COMMAND_SIZE];
769 struct st_request *SRpnt;
770 struct st_partstat *STps;
771
772 result = write_behind_check(STp);
773 if (result)
774 return result;
775
776 result = 0;
777 if (STp->dirty == 1) {
778
779 transfer = STp->buffer->buffer_bytes;
780 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
781
782 memset(cmd, 0, MAX_COMMAND_SIZE);
783 cmd[0] = WRITE_6;
784 cmd[1] = 1;
785 blks = transfer / STp->block_size;
786 cmd[2] = blks >> 16;
787 cmd[3] = blks >> 8;
788 cmd[4] = blks;
789
790 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
791 STp->device->request_queue->rq_timeout,
792 MAX_WRITE_RETRIES, 1);
793 if (!SRpnt)
794 return (STp->buffer)->syscall_result;
795
796 STps = &(STp->ps[STp->partition]);
797 if ((STp->buffer)->syscall_result != 0) {
798 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
799
800 if (cmdstatp->have_sense && !cmdstatp->deferred &&
801 (cmdstatp->flags & SENSE_EOM) &&
802 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
803 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
804 (!cmdstatp->remainder_valid ||
805 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
806 STp->dirty = 0;
807 (STp->buffer)->buffer_bytes = 0;
808 if (STps->drv_block >= 0)
809 STps->drv_block += blks;
810 result = (-ENOSPC);
811 } else {
812 st_printk(KERN_ERR, STp, "Error on flush.\n");
813 STps->drv_block = (-1);
814 result = (-EIO);
815 }
816 } else {
817 if (STps->drv_block >= 0)
818 STps->drv_block += blks;
819 STp->dirty = 0;
820 (STp->buffer)->buffer_bytes = 0;
821 }
822 st_release_request(SRpnt);
823 SRpnt = NULL;
824 }
825 return result;
826 }
827
828
829 /* Flush the tape buffer. The tape will be positioned correctly unless
830 seek_next is true. */
831 static int flush_buffer(struct scsi_tape *STp, int seek_next)
832 {
833 int backspace, result;
834 struct st_partstat *STps;
835
836 /*
837 * If there was a bus reset, block further access
838 * to this device.
839 */
840 if (STp->pos_unknown)
841 return (-EIO);
842
843 if (STp->ready != ST_READY)
844 return 0;
845 STps = &(STp->ps[STp->partition]);
846 if (STps->rw == ST_WRITING) /* Writing */
847 return st_flush_write_buffer(STp);
848
849 if (STp->block_size == 0)
850 return 0;
851
852 backspace = ((STp->buffer)->buffer_bytes +
853 (STp->buffer)->read_pointer) / STp->block_size -
854 ((STp->buffer)->read_pointer + STp->block_size - 1) /
855 STp->block_size;
856 (STp->buffer)->buffer_bytes = 0;
857 (STp->buffer)->read_pointer = 0;
858 result = 0;
859 if (!seek_next) {
860 if (STps->eof == ST_FM_HIT) {
861 result = cross_eof(STp, 0); /* Back over the EOF hit */
862 if (!result)
863 STps->eof = ST_NOEOF;
864 else {
865 if (STps->drv_file >= 0)
866 STps->drv_file++;
867 STps->drv_block = 0;
868 }
869 }
870 if (!result && backspace > 0)
871 result = st_int_ioctl(STp, MTBSR, backspace);
872 } else if (STps->eof == ST_FM_HIT) {
873 if (STps->drv_file >= 0)
874 STps->drv_file++;
875 STps->drv_block = 0;
876 STps->eof = ST_NOEOF;
877 }
878 return result;
879
880 }
881 \f
882 /* Set the mode parameters */
883 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
884 {
885 int set_it = 0;
886 unsigned long arg;
887
888 if (!STp->density_changed &&
889 STm->default_density >= 0 &&
890 STm->default_density != STp->density) {
891 arg = STm->default_density;
892 set_it = 1;
893 } else
894 arg = STp->density;
895 arg <<= MT_ST_DENSITY_SHIFT;
896 if (!STp->blksize_changed &&
897 STm->default_blksize >= 0 &&
898 STm->default_blksize != STp->block_size) {
899 arg |= STm->default_blksize;
900 set_it = 1;
901 } else
902 arg |= STp->block_size;
903 if (set_it &&
904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
905 st_printk(KERN_WARNING, STp,
906 "Can't set default block size to %d bytes "
907 "and density %x.\n",
908 STm->default_blksize, STm->default_density);
909 if (modes_defined)
910 return (-EINVAL);
911 }
912 return 0;
913 }
914
915
916 /* Lock or unlock the drive door. Don't use when st_request allocated. */
917 static int do_door_lock(struct scsi_tape * STp, int do_lock)
918 {
919 int retval;
920
921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
922
923 retval = scsi_set_medium_removal(STp->device,
924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
925 if (!retval)
926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
927 else
928 STp->door_locked = ST_LOCK_FAILS;
929 return retval;
930 }
931
932
933 /* Set the internal state after reset */
934 static void reset_state(struct scsi_tape *STp)
935 {
936 int i;
937 struct st_partstat *STps;
938
939 STp->pos_unknown = 0;
940 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
941 STps = &(STp->ps[i]);
942 STps->rw = ST_IDLE;
943 STps->eof = ST_NOEOF;
944 STps->at_sm = 0;
945 STps->last_block_valid = 0;
946 STps->drv_block = -1;
947 STps->drv_file = -1;
948 }
949 if (STp->can_partitions) {
950 STp->partition = find_partition(STp);
951 if (STp->partition < 0)
952 STp->partition = 0;
953 STp->new_partition = STp->partition;
954 }
955 }
956 \f
957 /* Test if the drive is ready. Returns either one of the codes below or a negative system
958 error code. */
959 #define CHKRES_READY 0
960 #define CHKRES_NEW_SESSION 1
961 #define CHKRES_NOT_READY 2
962 #define CHKRES_NO_TAPE 3
963
964 #define MAX_ATTENTIONS 10
965
966 static int test_ready(struct scsi_tape *STp, int do_wait)
967 {
968 int attentions, waits, max_wait, scode;
969 int retval = CHKRES_READY, new_session = 0;
970 unsigned char cmd[MAX_COMMAND_SIZE];
971 struct st_request *SRpnt = NULL;
972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
973
974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
975
976 for (attentions=waits=0; ; ) {
977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
978 cmd[0] = TEST_UNIT_READY;
979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
980 STp->long_timeout, MAX_READY_RETRIES, 1);
981
982 if (!SRpnt) {
983 retval = (STp->buffer)->syscall_result;
984 break;
985 }
986
987 if (cmdstatp->have_sense) {
988
989 scode = cmdstatp->sense_hdr.sense_key;
990
991 if (scode == UNIT_ATTENTION) { /* New media? */
992 new_session = 1;
993 if (attentions < MAX_ATTENTIONS) {
994 attentions++;
995 continue;
996 }
997 else {
998 retval = (-EIO);
999 break;
1000 }
1001 }
1002
1003 if (scode == NOT_READY) {
1004 if (waits < max_wait) {
1005 if (msleep_interruptible(1000)) {
1006 retval = (-EINTR);
1007 break;
1008 }
1009 waits++;
1010 continue;
1011 }
1012 else {
1013 if ((STp->device)->scsi_level >= SCSI_2 &&
1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1015 retval = CHKRES_NO_TAPE;
1016 else
1017 retval = CHKRES_NOT_READY;
1018 break;
1019 }
1020 }
1021 }
1022
1023 retval = (STp->buffer)->syscall_result;
1024 if (!retval)
1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1026 break;
1027 }
1028
1029 if (SRpnt != NULL)
1030 st_release_request(SRpnt);
1031 return retval;
1032 }
1033
1034
1035 /* See if the drive is ready and gather information about the tape. Return values:
1036 < 0 negative error code from errno.h
1037 0 drive ready
1038 1 drive not ready (possibly no tape)
1039 */
1040 static int check_tape(struct scsi_tape *STp, struct file *filp)
1041 {
1042 int i, retval, new_session = 0, do_wait;
1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1044 unsigned short st_flags = filp->f_flags;
1045 struct st_request *SRpnt = NULL;
1046 struct st_modedef *STm;
1047 struct st_partstat *STps;
1048 struct inode *inode = file_inode(filp);
1049 int mode = TAPE_MODE(inode);
1050
1051 STp->ready = ST_READY;
1052
1053 if (mode != STp->current_mode) {
1054 DEBC_printk(STp, "Mode change from %d to %d.\n",
1055 STp->current_mode, mode);
1056 new_session = 1;
1057 STp->current_mode = mode;
1058 }
1059 STm = &(STp->modes[STp->current_mode]);
1060
1061 saved_cleaning = STp->cleaning_req;
1062 STp->cleaning_req = 0;
1063
1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1065 retval = test_ready(STp, do_wait);
1066
1067 if (retval < 0)
1068 goto err_out;
1069
1070 if (retval == CHKRES_NEW_SESSION) {
1071 STp->pos_unknown = 0;
1072 STp->partition = STp->new_partition = 0;
1073 if (STp->can_partitions)
1074 STp->nbr_partitions = 1; /* This guess will be updated later
1075 if necessary */
1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1077 STps = &(STp->ps[i]);
1078 STps->rw = ST_IDLE;
1079 STps->eof = ST_NOEOF;
1080 STps->at_sm = 0;
1081 STps->last_block_valid = 0;
1082 STps->drv_block = 0;
1083 STps->drv_file = 0;
1084 }
1085 new_session = 1;
1086 }
1087 else {
1088 STp->cleaning_req |= saved_cleaning;
1089
1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1091 if (retval == CHKRES_NO_TAPE)
1092 STp->ready = ST_NO_TAPE;
1093 else
1094 STp->ready = ST_NOT_READY;
1095
1096 STp->density = 0; /* Clear the erroneous "residue" */
1097 STp->write_prot = 0;
1098 STp->block_size = 0;
1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1100 STp->partition = STp->new_partition = 0;
1101 STp->door_locked = ST_UNLOCKED;
1102 return CHKRES_NOT_READY;
1103 }
1104 }
1105
1106 if (STp->omit_blklims)
1107 STp->min_block = STp->max_block = (-1);
1108 else {
1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1110 cmd[0] = READ_BLOCK_LIMITS;
1111
1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1113 STp->device->request_queue->rq_timeout,
1114 MAX_READY_RETRIES, 1);
1115 if (!SRpnt) {
1116 retval = (STp->buffer)->syscall_result;
1117 goto err_out;
1118 }
1119
1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1124 (STp->buffer)->b_data[5];
1125 if ( DEB( debugging || ) !STp->inited)
1126 st_printk(KERN_INFO, STp,
1127 "Block limits %d - %d bytes.\n",
1128 STp->min_block, STp->max_block);
1129 } else {
1130 STp->min_block = STp->max_block = (-1);
1131 DEBC_printk(STp, "Can't read block limits.\n");
1132 }
1133 }
1134
1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1136 cmd[0] = MODE_SENSE;
1137 cmd[4] = 12;
1138
1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1140 STp->device->request_queue->rq_timeout,
1141 MAX_READY_RETRIES, 1);
1142 if (!SRpnt) {
1143 retval = (STp->buffer)->syscall_result;
1144 goto err_out;
1145 }
1146
1147 if ((STp->buffer)->syscall_result != 0) {
1148 DEBC_printk(STp, "No Mode Sense.\n");
1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1151 STp->drv_write_prot = 0;
1152 } else {
1153 DEBC_printk(STp,"Mode sense. Length %d, "
1154 "medium %x, WBS %x, BLL %d\n",
1155 (STp->buffer)->b_data[0],
1156 (STp->buffer)->b_data[1],
1157 (STp->buffer)->b_data[2],
1158 (STp->buffer)->b_data[3]);
1159
1160 if ((STp->buffer)->b_data[3] >= 8) {
1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1162 STp->density = (STp->buffer)->b_data[4];
1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1165 DEBC_printk(STp, "Density %x, tape length: %x, "
1166 "drv buffer: %d\n",
1167 STp->density,
1168 (STp->buffer)->b_data[5] * 65536 +
1169 (STp->buffer)->b_data[6] * 256 +
1170 (STp->buffer)->b_data[7],
1171 STp->drv_buffer);
1172 }
1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1174 if (!STp->drv_buffer && STp->immediate_filemark) {
1175 st_printk(KERN_WARNING, STp,
1176 "non-buffered tape: disabling "
1177 "writing immediate filemarks\n");
1178 STp->immediate_filemark = 0;
1179 }
1180 }
1181 st_release_request(SRpnt);
1182 SRpnt = NULL;
1183 STp->inited = 1;
1184
1185 if (STp->block_size > 0)
1186 (STp->buffer)->buffer_blocks =
1187 (STp->buffer)->buffer_size / STp->block_size;
1188 else
1189 (STp->buffer)->buffer_blocks = 1;
1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1191
1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1193 STp->block_size, (STp->buffer)->buffer_size,
1194 (STp->buffer)->buffer_blocks);
1195
1196 if (STp->drv_write_prot) {
1197 STp->write_prot = 1;
1198
1199 DEBC_printk(STp, "Write protected\n");
1200
1201 if (do_wait &&
1202 ((st_flags & O_ACCMODE) == O_WRONLY ||
1203 (st_flags & O_ACCMODE) == O_RDWR)) {
1204 retval = (-EROFS);
1205 goto err_out;
1206 }
1207 }
1208
1209 if (STp->can_partitions && STp->nbr_partitions < 1) {
1210 /* This code is reached when the device is opened for the first time
1211 after the driver has been initialized with tape in the drive and the
1212 partition support has been enabled. */
1213 DEBC_printk(STp, "Updating partition number in status.\n");
1214 if ((STp->partition = find_partition(STp)) < 0) {
1215 retval = STp->partition;
1216 goto err_out;
1217 }
1218 STp->new_partition = STp->partition;
1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1220 }
1221
1222 if (new_session) { /* Change the drive parameters for the new mode */
1223 STp->density_changed = STp->blksize_changed = 0;
1224 STp->compression_changed = 0;
1225 if (!(STm->defaults_for_writes) &&
1226 (retval = set_mode_densblk(STp, STm)) < 0)
1227 goto err_out;
1228
1229 if (STp->default_drvbuffer != 0xff) {
1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1231 st_printk(KERN_WARNING, STp,
1232 "Can't set default drive "
1233 "buffering to %d.\n",
1234 STp->default_drvbuffer);
1235 }
1236 }
1237
1238 return CHKRES_READY;
1239
1240 err_out:
1241 return retval;
1242 }
1243
1244
1245 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1246 module count. */
1247 static int st_open(struct inode *inode, struct file *filp)
1248 {
1249 int i, retval = (-EIO);
1250 int resumed = 0;
1251 struct scsi_tape *STp;
1252 struct st_partstat *STps;
1253 int dev = TAPE_NR(inode);
1254
1255 /*
1256 * We really want to do nonseekable_open(inode, filp); here, but some
1257 * versions of tar incorrectly call lseek on tapes and bail out if that
1258 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1259 */
1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1261
1262 if (!(STp = scsi_tape_get(dev))) {
1263 return -ENXIO;
1264 }
1265
1266 filp->private_data = STp;
1267
1268 spin_lock(&st_use_lock);
1269 if (STp->in_use) {
1270 spin_unlock(&st_use_lock);
1271 scsi_tape_put(STp);
1272 DEBC_printk(STp, "Device already in use.\n");
1273 return (-EBUSY);
1274 }
1275
1276 STp->in_use = 1;
1277 spin_unlock(&st_use_lock);
1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1279
1280 if (scsi_autopm_get_device(STp->device) < 0) {
1281 retval = -EIO;
1282 goto err_out;
1283 }
1284 resumed = 1;
1285 if (!scsi_block_when_processing_errors(STp->device)) {
1286 retval = (-ENXIO);
1287 goto err_out;
1288 }
1289
1290 /* See that we have at least a one page buffer available */
1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1292 st_printk(KERN_WARNING, STp,
1293 "Can't allocate one page tape buffer.\n");
1294 retval = (-EOVERFLOW);
1295 goto err_out;
1296 }
1297
1298 (STp->buffer)->cleared = 0;
1299 (STp->buffer)->writing = 0;
1300 (STp->buffer)->syscall_result = 0;
1301
1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1303
1304 STp->dirty = 0;
1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1306 STps = &(STp->ps[i]);
1307 STps->rw = ST_IDLE;
1308 }
1309 STp->try_dio_now = STp->try_dio;
1310 STp->recover_count = 0;
1311 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1313
1314 retval = check_tape(STp, filp);
1315 if (retval < 0)
1316 goto err_out;
1317 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1318 retval != CHKRES_READY) {
1319 if (STp->ready == NO_TAPE)
1320 retval = (-ENOMEDIUM);
1321 else
1322 retval = (-EIO);
1323 goto err_out;
1324 }
1325 return 0;
1326
1327 err_out:
1328 normalize_buffer(STp->buffer);
1329 spin_lock(&st_use_lock);
1330 STp->in_use = 0;
1331 spin_unlock(&st_use_lock);
1332 if (resumed)
1333 scsi_autopm_put_device(STp->device);
1334 scsi_tape_put(STp);
1335 return retval;
1336
1337 }
1338 \f
1339
1340 /* Flush the tape buffer before close */
1341 static int st_flush(struct file *filp, fl_owner_t id)
1342 {
1343 int result = 0, result2;
1344 unsigned char cmd[MAX_COMMAND_SIZE];
1345 struct st_request *SRpnt;
1346 struct scsi_tape *STp = filp->private_data;
1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1348 struct st_partstat *STps = &(STp->ps[STp->partition]);
1349
1350 if (file_count(filp) > 1)
1351 return 0;
1352
1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1354 result = st_flush_write_buffer(STp);
1355 if (result != 0 && result != (-ENOSPC))
1356 goto out;
1357 }
1358
1359 if (STp->can_partitions &&
1360 (result2 = switch_partition(STp)) < 0) {
1361 DEBC_printk(STp, "switch_partition at close failed.\n");
1362 if (result == 0)
1363 result = result2;
1364 goto out;
1365 }
1366
1367 DEBC( if (STp->nbr_requests)
1368 st_printk(KERN_DEBUG, STp,
1369 "Number of r/w requests %d, dio used in %d, "
1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1371 STp->nbr_pages));
1372
1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1375
1376 #if DEBUG
1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1378 STp->nbr_waits, STp->nbr_finished);
1379 #endif
1380 memset(cmd, 0, MAX_COMMAND_SIZE);
1381 cmd[0] = WRITE_FILEMARKS;
1382 if (STp->immediate_filemark)
1383 cmd[1] = 1;
1384 cmd[4] = 1 + STp->two_fm;
1385
1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1387 STp->device->request_queue->rq_timeout,
1388 MAX_WRITE_RETRIES, 1);
1389 if (!SRpnt) {
1390 result = (STp->buffer)->syscall_result;
1391 goto out;
1392 }
1393
1394 if (STp->buffer->syscall_result == 0 ||
1395 (cmdstatp->have_sense && !cmdstatp->deferred &&
1396 (cmdstatp->flags & SENSE_EOM) &&
1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1400 /* Write successful at EOM */
1401 st_release_request(SRpnt);
1402 SRpnt = NULL;
1403 if (STps->drv_file >= 0)
1404 STps->drv_file++;
1405 STps->drv_block = 0;
1406 if (STp->two_fm)
1407 cross_eof(STp, 0);
1408 STps->eof = ST_FM;
1409 }
1410 else { /* Write error */
1411 st_release_request(SRpnt);
1412 SRpnt = NULL;
1413 st_printk(KERN_ERR, STp,
1414 "Error on write filemark.\n");
1415 if (result == 0)
1416 result = (-EIO);
1417 }
1418
1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1420 } else if (!STp->rew_at_close) {
1421 STps = &(STp->ps[STp->partition]);
1422 if (!STm->sysv || STps->rw != ST_READING) {
1423 if (STp->can_bsr)
1424 result = flush_buffer(STp, 0);
1425 else if (STps->eof == ST_FM_HIT) {
1426 result = cross_eof(STp, 0);
1427 if (result) {
1428 if (STps->drv_file >= 0)
1429 STps->drv_file++;
1430 STps->drv_block = 0;
1431 STps->eof = ST_FM;
1432 } else
1433 STps->eof = ST_NOEOF;
1434 }
1435 } else if ((STps->eof == ST_NOEOF &&
1436 !(result = cross_eof(STp, 1))) ||
1437 STps->eof == ST_FM_HIT) {
1438 if (STps->drv_file >= 0)
1439 STps->drv_file++;
1440 STps->drv_block = 0;
1441 STps->eof = ST_FM;
1442 }
1443 }
1444
1445 out:
1446 if (STp->rew_at_close) {
1447 result2 = st_int_ioctl(STp, MTREW, 1);
1448 if (result == 0)
1449 result = result2;
1450 }
1451 return result;
1452 }
1453
1454
1455 /* Close the device and release it. BKL is not needed: this is the only thread
1456 accessing this tape. */
1457 static int st_release(struct inode *inode, struct file *filp)
1458 {
1459 int result = 0;
1460 struct scsi_tape *STp = filp->private_data;
1461
1462 if (STp->door_locked == ST_LOCKED_AUTO)
1463 do_door_lock(STp, 0);
1464
1465 normalize_buffer(STp->buffer);
1466 spin_lock(&st_use_lock);
1467 STp->in_use = 0;
1468 spin_unlock(&st_use_lock);
1469 scsi_autopm_put_device(STp->device);
1470 scsi_tape_put(STp);
1471
1472 return result;
1473 }
1474 \f
1475 /* The checks common to both reading and writing */
1476 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1477 {
1478 ssize_t retval = 0;
1479
1480 /*
1481 * If we are in the middle of error recovery, don't let anyone
1482 * else try and use this device. Also, if error recovery fails, it
1483 * may try and take the device offline, in which case all further
1484 * access to the device is prohibited.
1485 */
1486 if (!scsi_block_when_processing_errors(STp->device)) {
1487 retval = (-ENXIO);
1488 goto out;
1489 }
1490
1491 if (STp->ready != ST_READY) {
1492 if (STp->ready == ST_NO_TAPE)
1493 retval = (-ENOMEDIUM);
1494 else
1495 retval = (-EIO);
1496 goto out;
1497 }
1498
1499 if (! STp->modes[STp->current_mode].defined) {
1500 retval = (-ENXIO);
1501 goto out;
1502 }
1503
1504
1505 /*
1506 * If there was a bus reset, block further access
1507 * to this device.
1508 */
1509 if (STp->pos_unknown) {
1510 retval = (-EIO);
1511 goto out;
1512 }
1513
1514 if (count == 0)
1515 goto out;
1516
1517 DEB(
1518 if (!STp->in_use) {
1519 st_printk(ST_DEB_MSG, STp,
1520 "Incorrect device.\n");
1521 retval = (-EIO);
1522 goto out;
1523 } ) /* end DEB */
1524
1525 if (STp->can_partitions &&
1526 (retval = switch_partition(STp)) < 0)
1527 goto out;
1528
1529 if (STp->block_size == 0 && STp->max_block > 0 &&
1530 (count < STp->min_block || count > STp->max_block)) {
1531 retval = (-EINVAL);
1532 goto out;
1533 }
1534
1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1536 !do_door_lock(STp, 1))
1537 STp->door_locked = ST_LOCKED_AUTO;
1538
1539 out:
1540 return retval;
1541 }
1542
1543
1544 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1545 size_t count, int is_read)
1546 {
1547 int i, bufsize, retval = 0;
1548 struct st_buffer *STbp = STp->buffer;
1549
1550 if (is_read)
1551 i = STp->try_dio_now && try_rdio;
1552 else
1553 i = STp->try_dio_now && try_wdio;
1554
1555 if (i && ((unsigned long)buf & queue_dma_alignment(
1556 STp->device->request_queue)) == 0) {
1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1558 count, (is_read ? READ : WRITE));
1559 if (i > 0) {
1560 STbp->do_dio = i;
1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1562 }
1563 else
1564 STbp->do_dio = 0; /* fall back to buffering with any error */
1565 STbp->sg_segs = STbp->do_dio;
1566 DEB(
1567 if (STbp->do_dio) {
1568 STp->nbr_dio++;
1569 STp->nbr_pages += STbp->do_dio;
1570 }
1571 )
1572 } else
1573 STbp->do_dio = 0;
1574 DEB( STp->nbr_requests++; )
1575
1576 if (!STbp->do_dio) {
1577 if (STp->block_size)
1578 bufsize = STp->block_size > st_fixed_buffer_size ?
1579 STp->block_size : st_fixed_buffer_size;
1580 else {
1581 bufsize = count;
1582 /* Make sure that data from previous user is not leaked even if
1583 HBA does not return correct residual */
1584 if (is_read && STp->sili && !STbp->cleared)
1585 clear_buffer(STbp);
1586 }
1587
1588 if (bufsize > STbp->buffer_size &&
1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1590 st_printk(KERN_WARNING, STp,
1591 "Can't allocate %d byte tape buffer.\n",
1592 bufsize);
1593 retval = (-EOVERFLOW);
1594 goto out;
1595 }
1596 if (STp->block_size)
1597 STbp->buffer_blocks = bufsize / STp->block_size;
1598 }
1599
1600 out:
1601 return retval;
1602 }
1603
1604
1605 /* Can be called more than once after each setup_buffer() */
1606 static void release_buffering(struct scsi_tape *STp, int is_read)
1607 {
1608 struct st_buffer *STbp;
1609
1610 STbp = STp->buffer;
1611 if (STbp->do_dio) {
1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1613 STbp->do_dio = 0;
1614 STbp->sg_segs = 0;
1615 }
1616 }
1617
1618
1619 /* Write command */
1620 static ssize_t
1621 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1622 {
1623 ssize_t total;
1624 ssize_t i, do_count, blks, transfer;
1625 ssize_t retval;
1626 int undone, retry_eot = 0, scode;
1627 int async_write;
1628 unsigned char cmd[MAX_COMMAND_SIZE];
1629 const char __user *b_point;
1630 struct st_request *SRpnt = NULL;
1631 struct scsi_tape *STp = filp->private_data;
1632 struct st_modedef *STm;
1633 struct st_partstat *STps;
1634 struct st_buffer *STbp;
1635
1636 if (mutex_lock_interruptible(&STp->lock))
1637 return -ERESTARTSYS;
1638
1639 retval = rw_checks(STp, filp, count);
1640 if (retval || count == 0)
1641 goto out;
1642
1643 /* Write must be integral number of blocks */
1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1645 st_printk(KERN_WARNING, STp,
1646 "Write not multiple of tape block size.\n");
1647 retval = (-EINVAL);
1648 goto out;
1649 }
1650
1651 STm = &(STp->modes[STp->current_mode]);
1652 STps = &(STp->ps[STp->partition]);
1653
1654 if (STp->write_prot) {
1655 retval = (-EACCES);
1656 goto out;
1657 }
1658
1659
1660 if (STps->rw == ST_READING) {
1661 retval = flush_buffer(STp, 0);
1662 if (retval)
1663 goto out;
1664 STps->rw = ST_WRITING;
1665 } else if (STps->rw != ST_WRITING &&
1666 STps->drv_file == 0 && STps->drv_block == 0) {
1667 if ((retval = set_mode_densblk(STp, STm)) < 0)
1668 goto out;
1669 if (STm->default_compression != ST_DONT_TOUCH &&
1670 !(STp->compression_changed)) {
1671 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1672 st_printk(KERN_WARNING, STp,
1673 "Can't set default compression.\n");
1674 if (modes_defined) {
1675 retval = (-EINVAL);
1676 goto out;
1677 }
1678 }
1679 }
1680 }
1681
1682 STbp = STp->buffer;
1683 i = write_behind_check(STp);
1684 if (i) {
1685 if (i == -ENOSPC)
1686 STps->eof = ST_EOM_OK;
1687 else
1688 STps->eof = ST_EOM_ERROR;
1689 }
1690
1691 if (STps->eof == ST_EOM_OK) {
1692 STps->eof = ST_EOD_1; /* allow next write */
1693 retval = (-ENOSPC);
1694 goto out;
1695 }
1696 else if (STps->eof == ST_EOM_ERROR) {
1697 retval = (-EIO);
1698 goto out;
1699 }
1700
1701 /* Check the buffer readability in cases where copy_user might catch
1702 the problems after some tape movement. */
1703 if (STp->block_size != 0 &&
1704 !STbp->do_dio &&
1705 (copy_from_user(&i, buf, 1) != 0 ||
1706 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1707 retval = (-EFAULT);
1708 goto out;
1709 }
1710
1711 retval = setup_buffering(STp, buf, count, 0);
1712 if (retval)
1713 goto out;
1714
1715 total = count;
1716
1717 memset(cmd, 0, MAX_COMMAND_SIZE);
1718 cmd[0] = WRITE_6;
1719 cmd[1] = (STp->block_size != 0);
1720
1721 STps->rw = ST_WRITING;
1722
1723 b_point = buf;
1724 while (count > 0 && !retry_eot) {
1725
1726 if (STbp->do_dio) {
1727 do_count = count;
1728 }
1729 else {
1730 if (STp->block_size == 0)
1731 do_count = count;
1732 else {
1733 do_count = STbp->buffer_blocks * STp->block_size -
1734 STbp->buffer_bytes;
1735 if (do_count > count)
1736 do_count = count;
1737 }
1738
1739 i = append_to_buffer(b_point, STbp, do_count);
1740 if (i) {
1741 retval = i;
1742 goto out;
1743 }
1744 }
1745 count -= do_count;
1746 b_point += do_count;
1747
1748 async_write = STp->block_size == 0 && !STbp->do_dio &&
1749 STm->do_async_writes && STps->eof < ST_EOM_OK;
1750
1751 if (STp->block_size != 0 && STm->do_buffer_writes &&
1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1753 STbp->buffer_bytes < STbp->buffer_size) {
1754 STp->dirty = 1;
1755 /* Don't write a buffer that is not full enough. */
1756 if (!async_write && count == 0)
1757 break;
1758 }
1759
1760 retry_write:
1761 if (STp->block_size == 0)
1762 blks = transfer = do_count;
1763 else {
1764 if (!STbp->do_dio)
1765 blks = STbp->buffer_bytes;
1766 else
1767 blks = do_count;
1768 blks /= STp->block_size;
1769 transfer = blks * STp->block_size;
1770 }
1771 cmd[2] = blks >> 16;
1772 cmd[3] = blks >> 8;
1773 cmd[4] = blks;
1774
1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1776 STp->device->request_queue->rq_timeout,
1777 MAX_WRITE_RETRIES, !async_write);
1778 if (!SRpnt) {
1779 retval = STbp->syscall_result;
1780 goto out;
1781 }
1782 if (async_write && !STbp->syscall_result) {
1783 STbp->writing = transfer;
1784 STp->dirty = !(STbp->writing ==
1785 STbp->buffer_bytes);
1786 SRpnt = NULL; /* Prevent releasing this request! */
1787 DEB( STp->write_pending = 1; )
1788 break;
1789 }
1790
1791 if (STbp->syscall_result != 0) {
1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1793
1794 DEBC_printk(STp, "Error on write:\n");
1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1796 scode = cmdstatp->sense_hdr.sense_key;
1797 if (cmdstatp->remainder_valid)
1798 undone = (int)cmdstatp->uremainder64;
1799 else if (STp->block_size == 0 &&
1800 scode == VOLUME_OVERFLOW)
1801 undone = transfer;
1802 else
1803 undone = 0;
1804 if (STp->block_size != 0)
1805 undone *= STp->block_size;
1806 if (undone <= do_count) {
1807 /* Only data from this write is not written */
1808 count += undone;
1809 b_point -= undone;
1810 do_count -= undone;
1811 if (STp->block_size)
1812 blks = (transfer - undone) / STp->block_size;
1813 STps->eof = ST_EOM_OK;
1814 /* Continue in fixed block mode if all written
1815 in this request but still something left to write
1816 (retval left to zero)
1817 */
1818 if (STp->block_size == 0 ||
1819 undone > 0 || count == 0)
1820 retval = (-ENOSPC); /* EOM within current request */
1821 DEBC_printk(STp, "EOM with %d "
1822 "bytes unwritten.\n",
1823 (int)count);
1824 } else {
1825 /* EOT within data buffered earlier (possible only
1826 in fixed block mode without direct i/o) */
1827 if (!retry_eot && !cmdstatp->deferred &&
1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1829 move_buffer_data(STp->buffer, transfer - undone);
1830 retry_eot = 1;
1831 if (STps->drv_block >= 0) {
1832 STps->drv_block += (transfer - undone) /
1833 STp->block_size;
1834 }
1835 STps->eof = ST_EOM_OK;
1836 DEBC_printk(STp, "Retry "
1837 "write of %d "
1838 "bytes at EOM.\n",
1839 STp->buffer->buffer_bytes);
1840 goto retry_write;
1841 }
1842 else {
1843 /* Either error within data buffered by driver or
1844 failed retry */
1845 count -= do_count;
1846 blks = do_count = 0;
1847 STps->eof = ST_EOM_ERROR;
1848 STps->drv_block = (-1); /* Too cautious? */
1849 retval = (-EIO); /* EOM for old data */
1850 DEBC_printk(STp, "EOM with "
1851 "lost data.\n");
1852 }
1853 }
1854 } else {
1855 count += do_count;
1856 STps->drv_block = (-1); /* Too cautious? */
1857 retval = STbp->syscall_result;
1858 }
1859
1860 }
1861
1862 if (STps->drv_block >= 0) {
1863 if (STp->block_size == 0)
1864 STps->drv_block += (do_count > 0);
1865 else
1866 STps->drv_block += blks;
1867 }
1868
1869 STbp->buffer_bytes = 0;
1870 STp->dirty = 0;
1871
1872 if (retval || retry_eot) {
1873 if (count < total)
1874 retval = total - count;
1875 goto out;
1876 }
1877 }
1878
1879 if (STps->eof == ST_EOD_1)
1880 STps->eof = ST_EOM_OK;
1881 else if (STps->eof != ST_EOM_OK)
1882 STps->eof = ST_NOEOF;
1883 retval = total - count;
1884
1885 out:
1886 if (SRpnt != NULL)
1887 st_release_request(SRpnt);
1888 release_buffering(STp, 0);
1889 mutex_unlock(&STp->lock);
1890
1891 return retval;
1892 }
1893 \f
1894 /* Read data from the tape. Returns zero in the normal case, one if the
1895 eof status has changed, and the negative error code in case of a
1896 fatal error. Otherwise updates the buffer and the eof state.
1897
1898 Does release user buffer mapping if it is set.
1899 */
1900 static long read_tape(struct scsi_tape *STp, long count,
1901 struct st_request ** aSRpnt)
1902 {
1903 int transfer, blks, bytes;
1904 unsigned char cmd[MAX_COMMAND_SIZE];
1905 struct st_request *SRpnt;
1906 struct st_modedef *STm;
1907 struct st_partstat *STps;
1908 struct st_buffer *STbp;
1909 int retval = 0;
1910
1911 if (count == 0)
1912 return 0;
1913
1914 STm = &(STp->modes[STp->current_mode]);
1915 STps = &(STp->ps[STp->partition]);
1916 if (STps->eof == ST_FM_HIT)
1917 return 1;
1918 STbp = STp->buffer;
1919
1920 if (STp->block_size == 0)
1921 blks = bytes = count;
1922 else {
1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1924 blks = (STp->buffer)->buffer_blocks;
1925 bytes = blks * STp->block_size;
1926 } else {
1927 bytes = count;
1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1929 bytes = (STp->buffer)->buffer_size;
1930 blks = bytes / STp->block_size;
1931 bytes = blks * STp->block_size;
1932 }
1933 }
1934
1935 memset(cmd, 0, MAX_COMMAND_SIZE);
1936 cmd[0] = READ_6;
1937 cmd[1] = (STp->block_size != 0);
1938 if (!cmd[1] && STp->sili)
1939 cmd[1] |= 2;
1940 cmd[2] = blks >> 16;
1941 cmd[3] = blks >> 8;
1942 cmd[4] = blks;
1943
1944 SRpnt = *aSRpnt;
1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1946 STp->device->request_queue->rq_timeout,
1947 MAX_RETRIES, 1);
1948 release_buffering(STp, 1);
1949 *aSRpnt = SRpnt;
1950 if (!SRpnt)
1951 return STbp->syscall_result;
1952
1953 STbp->read_pointer = 0;
1954 STps->at_sm = 0;
1955
1956 /* Something to check */
1957 if (STbp->syscall_result) {
1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1959
1960 retval = 1;
1961 DEBC_printk(STp,
1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1963 SRpnt->sense[0], SRpnt->sense[1],
1964 SRpnt->sense[2], SRpnt->sense[3],
1965 SRpnt->sense[4], SRpnt->sense[5],
1966 SRpnt->sense[6], SRpnt->sense[7]);
1967 if (cmdstatp->have_sense) {
1968
1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1971
1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1973 /* Compute the residual count */
1974 if (cmdstatp->remainder_valid)
1975 transfer = (int)cmdstatp->uremainder64;
1976 else
1977 transfer = 0;
1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1979 if (STp->block_size == 0)
1980 transfer = bytes;
1981 /* Some drives set ILI with MEDIUM ERROR */
1982 cmdstatp->flags &= ~SENSE_ILI;
1983 }
1984
1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1986 if (STp->block_size == 0 &&
1987 transfer < 0) {
1988 st_printk(KERN_NOTICE, STp,
1989 "Failed to read %d "
1990 "byte block with %d "
1991 "byte transfer.\n",
1992 bytes - transfer,
1993 bytes);
1994 if (STps->drv_block >= 0)
1995 STps->drv_block += 1;
1996 STbp->buffer_bytes = 0;
1997 return (-ENOMEM);
1998 } else if (STp->block_size == 0) {
1999 STbp->buffer_bytes = bytes - transfer;
2000 } else {
2001 st_release_request(SRpnt);
2002 SRpnt = *aSRpnt = NULL;
2003 if (transfer == blks) { /* We did not get anything, error */
2004 st_printk(KERN_NOTICE, STp,
2005 "Incorrect "
2006 "block size.\n");
2007 if (STps->drv_block >= 0)
2008 STps->drv_block += blks - transfer + 1;
2009 st_int_ioctl(STp, MTBSR, 1);
2010 return (-EIO);
2011 }
2012 /* We have some data, deliver it */
2013 STbp->buffer_bytes = (blks - transfer) *
2014 STp->block_size;
2015 DEBC_printk(STp, "ILI but "
2016 "enough data "
2017 "received %ld "
2018 "%d.\n", count,
2019 STbp->buffer_bytes);
2020 if (STps->drv_block >= 0)
2021 STps->drv_block += 1;
2022 if (st_int_ioctl(STp, MTBSR, 1))
2023 return (-EIO);
2024 }
2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2026 if (STps->eof != ST_FM_HIT)
2027 STps->eof = ST_FM_HIT;
2028 else
2029 STps->eof = ST_EOD_2;
2030 if (STp->block_size == 0)
2031 STbp->buffer_bytes = 0;
2032 else
2033 STbp->buffer_bytes =
2034 bytes - transfer * STp->block_size;
2035 DEBC_printk(STp, "EOF detected (%d "
2036 "bytes read).\n",
2037 STbp->buffer_bytes);
2038 } else if (cmdstatp->flags & SENSE_EOM) {
2039 if (STps->eof == ST_FM)
2040 STps->eof = ST_EOD_1;
2041 else
2042 STps->eof = ST_EOM_OK;
2043 if (STp->block_size == 0)
2044 STbp->buffer_bytes = bytes - transfer;
2045 else
2046 STbp->buffer_bytes =
2047 bytes - transfer * STp->block_size;
2048
2049 DEBC_printk(STp, "EOM detected (%d "
2050 "bytes read).\n",
2051 STbp->buffer_bytes);
2052 }
2053 }
2054 /* end of EOF, EOM, ILI test */
2055 else { /* nonzero sense key */
2056 DEBC_printk(STp, "Tape error while reading.\n");
2057 STps->drv_block = (-1);
2058 if (STps->eof == ST_FM &&
2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2060 DEBC_printk(STp, "Zero returned for "
2061 "first BLANK CHECK "
2062 "after EOF.\n");
2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2064 } else /* Some other extended sense code */
2065 retval = (-EIO);
2066 }
2067
2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2069 STbp->buffer_bytes = 0;
2070 }
2071 /* End of extended sense test */
2072 else { /* Non-extended sense */
2073 retval = STbp->syscall_result;
2074 }
2075
2076 }
2077 /* End of error handling */
2078 else { /* Read successful */
2079 STbp->buffer_bytes = bytes;
2080 if (STp->sili) /* In fixed block mode residual is always zero here */
2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2082 }
2083
2084 if (STps->drv_block >= 0) {
2085 if (STp->block_size == 0)
2086 STps->drv_block++;
2087 else
2088 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2089 }
2090 return retval;
2091 }
2092 \f
2093
2094 /* Read command */
2095 static ssize_t
2096 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2097 {
2098 ssize_t total;
2099 ssize_t retval = 0;
2100 ssize_t i, transfer;
2101 int special, do_dio = 0;
2102 struct st_request *SRpnt = NULL;
2103 struct scsi_tape *STp = filp->private_data;
2104 struct st_modedef *STm;
2105 struct st_partstat *STps;
2106 struct st_buffer *STbp = STp->buffer;
2107
2108 if (mutex_lock_interruptible(&STp->lock))
2109 return -ERESTARTSYS;
2110
2111 retval = rw_checks(STp, filp, count);
2112 if (retval || count == 0)
2113 goto out;
2114
2115 STm = &(STp->modes[STp->current_mode]);
2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2117 if (!STm->do_read_ahead) {
2118 retval = (-EINVAL); /* Read must be integral number of blocks */
2119 goto out;
2120 }
2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2122 }
2123
2124 STps = &(STp->ps[STp->partition]);
2125 if (STps->rw == ST_WRITING) {
2126 retval = flush_buffer(STp, 0);
2127 if (retval)
2128 goto out;
2129 STps->rw = ST_READING;
2130 }
2131 DEB(
2132 if (debugging && STps->eof != ST_NOEOF)
2133 st_printk(ST_DEB_MSG, STp,
2134 "EOF/EOM flag up (%d). Bytes %d\n",
2135 STps->eof, STbp->buffer_bytes);
2136 ) /* end DEB */
2137
2138 retval = setup_buffering(STp, buf, count, 1);
2139 if (retval)
2140 goto out;
2141 do_dio = STbp->do_dio;
2142
2143 if (STbp->buffer_bytes == 0 &&
2144 STps->eof >= ST_EOD_1) {
2145 if (STps->eof < ST_EOD) {
2146 STps->eof += 1;
2147 retval = 0;
2148 goto out;
2149 }
2150 retval = (-EIO); /* EOM or Blank Check */
2151 goto out;
2152 }
2153
2154 if (do_dio) {
2155 /* Check the buffer writability before any tape movement. Don't alter
2156 buffer data. */
2157 if (copy_from_user(&i, buf, 1) != 0 ||
2158 copy_to_user(buf, &i, 1) != 0 ||
2159 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2160 copy_to_user(buf + count - 1, &i, 1) != 0) {
2161 retval = (-EFAULT);
2162 goto out;
2163 }
2164 }
2165
2166 STps->rw = ST_READING;
2167
2168
2169 /* Loop until enough data in buffer or a special condition found */
2170 for (total = 0, special = 0; total < count && !special;) {
2171
2172 /* Get new data if the buffer is empty */
2173 if (STbp->buffer_bytes == 0) {
2174 special = read_tape(STp, count - total, &SRpnt);
2175 if (special < 0) { /* No need to continue read */
2176 retval = special;
2177 goto out;
2178 }
2179 }
2180
2181 /* Move the data from driver buffer to user buffer */
2182 if (STbp->buffer_bytes > 0) {
2183 DEB(
2184 if (debugging && STps->eof != ST_NOEOF)
2185 st_printk(ST_DEB_MSG, STp,
2186 "EOF up (%d). Left %d, needed %d.\n",
2187 STps->eof, STbp->buffer_bytes,
2188 (int)(count - total));
2189 ) /* end DEB */
2190 transfer = STbp->buffer_bytes < count - total ?
2191 STbp->buffer_bytes : count - total;
2192 if (!do_dio) {
2193 i = from_buffer(STbp, buf, transfer);
2194 if (i) {
2195 retval = i;
2196 goto out;
2197 }
2198 }
2199 buf += transfer;
2200 total += transfer;
2201 }
2202
2203 if (STp->block_size == 0)
2204 break; /* Read only one variable length block */
2205
2206 } /* for (total = 0, special = 0;
2207 total < count && !special; ) */
2208
2209 /* Change the eof state if no data from tape or buffer */
2210 if (total == 0) {
2211 if (STps->eof == ST_FM_HIT) {
2212 STps->eof = ST_FM;
2213 STps->drv_block = 0;
2214 if (STps->drv_file >= 0)
2215 STps->drv_file++;
2216 } else if (STps->eof == ST_EOD_1) {
2217 STps->eof = ST_EOD_2;
2218 STps->drv_block = 0;
2219 if (STps->drv_file >= 0)
2220 STps->drv_file++;
2221 } else if (STps->eof == ST_EOD_2)
2222 STps->eof = ST_EOD;
2223 } else if (STps->eof == ST_FM)
2224 STps->eof = ST_NOEOF;
2225 retval = total;
2226
2227 out:
2228 if (SRpnt != NULL) {
2229 st_release_request(SRpnt);
2230 SRpnt = NULL;
2231 }
2232 if (do_dio) {
2233 release_buffering(STp, 1);
2234 STbp->buffer_bytes = 0;
2235 }
2236 mutex_unlock(&STp->lock);
2237
2238 return retval;
2239 }
2240 \f
2241
2242
2243 DEB(
2244 /* Set the driver options */
2245 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2246 {
2247 if (debugging) {
2248 st_printk(KERN_INFO, STp,
2249 "Mode %d options: buffer writes: %d, "
2250 "async writes: %d, read ahead: %d\n",
2251 STp->current_mode, STm->do_buffer_writes,
2252 STm->do_async_writes, STm->do_read_ahead);
2253 st_printk(KERN_INFO, STp,
2254 " can bsr: %d, two FMs: %d, "
2255 "fast mteom: %d, auto lock: %d,\n",
2256 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2257 STp->do_auto_lock);
2258 st_printk(KERN_INFO, STp,
2259 " defs for wr: %d, no block limits: %d, "
2260 "partitions: %d, s2 log: %d\n",
2261 STm->defaults_for_writes, STp->omit_blklims,
2262 STp->can_partitions, STp->scsi2_logical);
2263 st_printk(KERN_INFO, STp,
2264 " sysv: %d nowait: %d sili: %d "
2265 "nowait_filemark: %d\n",
2266 STm->sysv, STp->immediate, STp->sili,
2267 STp->immediate_filemark);
2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2269 }
2270 }
2271 )
2272
2273
2274 static int st_set_options(struct scsi_tape *STp, long options)
2275 {
2276 int value;
2277 long code;
2278 struct st_modedef *STm;
2279 struct cdev *cd0, *cd1;
2280 struct device *d0, *d1;
2281
2282 STm = &(STp->modes[STp->current_mode]);
2283 if (!STm->defined) {
2284 cd0 = STm->cdevs[0];
2285 cd1 = STm->cdevs[1];
2286 d0 = STm->devs[0];
2287 d1 = STm->devs[1];
2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2289 STm->cdevs[0] = cd0;
2290 STm->cdevs[1] = cd1;
2291 STm->devs[0] = d0;
2292 STm->devs[1] = d1;
2293 modes_defined = 1;
2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2295 STp->current_mode);
2296 }
2297
2298 code = options & MT_ST_OPTIONS;
2299 if (code == MT_ST_BOOLEANS) {
2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2309 if ((STp->device)->scsi_level >= SCSI_2)
2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2312 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2314 STm->sysv = (options & MT_ST_SYSV) != 0;
2315 STp->sili = (options & MT_ST_SILI) != 0;
2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2317 st_log_options(STp, STm); )
2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2319 value = (code == MT_ST_SETBOOLEANS);
2320 if ((options & MT_ST_BUFFER_WRITES) != 0)
2321 STm->do_buffer_writes = value;
2322 if ((options & MT_ST_ASYNC_WRITES) != 0)
2323 STm->do_async_writes = value;
2324 if ((options & MT_ST_DEF_WRITES) != 0)
2325 STm->defaults_for_writes = value;
2326 if ((options & MT_ST_READ_AHEAD) != 0)
2327 STm->do_read_ahead = value;
2328 if ((options & MT_ST_TWO_FM) != 0)
2329 STp->two_fm = value;
2330 if ((options & MT_ST_FAST_MTEOM) != 0)
2331 STp->fast_mteom = value;
2332 if ((options & MT_ST_AUTO_LOCK) != 0)
2333 STp->do_auto_lock = value;
2334 if ((options & MT_ST_CAN_BSR) != 0)
2335 STp->can_bsr = value;
2336 if ((options & MT_ST_NO_BLKLIMS) != 0)
2337 STp->omit_blklims = value;
2338 if ((STp->device)->scsi_level >= SCSI_2 &&
2339 (options & MT_ST_CAN_PARTITIONS) != 0)
2340 STp->can_partitions = value;
2341 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2342 STp->scsi2_logical = value;
2343 if ((options & MT_ST_NOWAIT) != 0)
2344 STp->immediate = value;
2345 if ((options & MT_ST_NOWAIT_EOF) != 0)
2346 STp->immediate_filemark = value;
2347 if ((options & MT_ST_SYSV) != 0)
2348 STm->sysv = value;
2349 if ((options & MT_ST_SILI) != 0)
2350 STp->sili = value;
2351 DEB(
2352 if ((options & MT_ST_DEBUGGING) != 0)
2353 debugging = value;
2354 st_log_options(STp, STm); )
2355 } else if (code == MT_ST_WRITE_THRESHOLD) {
2356 /* Retained for compatibility */
2357 } else if (code == MT_ST_DEF_BLKSIZE) {
2358 value = (options & ~MT_ST_OPTIONS);
2359 if (value == ~MT_ST_OPTIONS) {
2360 STm->default_blksize = (-1);
2361 DEBC_printk(STp, "Default block size disabled.\n");
2362 } else {
2363 STm->default_blksize = value;
2364 DEBC_printk(STp,"Default block size set to "
2365 "%d bytes.\n", STm->default_blksize);
2366 if (STp->ready == ST_READY) {
2367 STp->blksize_changed = 0;
2368 set_mode_densblk(STp, STm);
2369 }
2370 }
2371 } else if (code == MT_ST_TIMEOUTS) {
2372 value = (options & ~MT_ST_OPTIONS);
2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2376 (value & ~MT_ST_SET_LONG_TIMEOUT));
2377 } else {
2378 blk_queue_rq_timeout(STp->device->request_queue,
2379 value * HZ);
2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2381 value);
2382 }
2383 } else if (code == MT_ST_SET_CLN) {
2384 value = (options & ~MT_ST_OPTIONS) & 0xff;
2385 if (value != 0 &&
2386 (value < EXTENDED_SENSE_START ||
2387 value >= SCSI_SENSE_BUFFERSIZE))
2388 return (-EINVAL);
2389 STp->cln_mode = value;
2390 STp->cln_sense_mask = (options >> 8) & 0xff;
2391 STp->cln_sense_value = (options >> 16) & 0xff;
2392 st_printk(KERN_INFO, STp,
2393 "Cleaning request mode %d, mask %02x, value %02x\n",
2394 value, STp->cln_sense_mask, STp->cln_sense_value);
2395 } else if (code == MT_ST_DEF_OPTIONS) {
2396 code = (options & ~MT_ST_CLEAR_DEFAULT);
2397 value = (options & MT_ST_CLEAR_DEFAULT);
2398 if (code == MT_ST_DEF_DENSITY) {
2399 if (value == MT_ST_CLEAR_DEFAULT) {
2400 STm->default_density = (-1);
2401 DEBC_printk(STp,
2402 "Density default disabled.\n");
2403 } else {
2404 STm->default_density = value & 0xff;
2405 DEBC_printk(STp, "Density default set to %x\n",
2406 STm->default_density);
2407 if (STp->ready == ST_READY) {
2408 STp->density_changed = 0;
2409 set_mode_densblk(STp, STm);
2410 }
2411 }
2412 } else if (code == MT_ST_DEF_DRVBUFFER) {
2413 if (value == MT_ST_CLEAR_DEFAULT) {
2414 STp->default_drvbuffer = 0xff;
2415 DEBC_printk(STp,
2416 "Drive buffer default disabled.\n");
2417 } else {
2418 STp->default_drvbuffer = value & 7;
2419 DEBC_printk(STp,
2420 "Drive buffer default set to %x\n",
2421 STp->default_drvbuffer);
2422 if (STp->ready == ST_READY)
2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2424 }
2425 } else if (code == MT_ST_DEF_COMPRESSION) {
2426 if (value == MT_ST_CLEAR_DEFAULT) {
2427 STm->default_compression = ST_DONT_TOUCH;
2428 DEBC_printk(STp,
2429 "Compression default disabled.\n");
2430 } else {
2431 if ((value & 0xff00) != 0) {
2432 STp->c_algo = (value & 0xff00) >> 8;
2433 DEBC_printk(STp, "Compression "
2434 "algorithm set to 0x%x.\n",
2435 STp->c_algo);
2436 }
2437 if ((value & 0xff) != 0xff) {
2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2439 DEBC_printk(STp, "Compression default "
2440 "set to %x\n",
2441 (value & 1));
2442 if (STp->ready == ST_READY) {
2443 STp->compression_changed = 0;
2444 st_compression(STp, (STm->default_compression == ST_YES));
2445 }
2446 }
2447 }
2448 }
2449 } else
2450 return (-EIO);
2451
2452 return 0;
2453 }
2454 \f
2455 #define MODE_HEADER_LENGTH 4
2456
2457 /* Mode header and page byte offsets */
2458 #define MH_OFF_DATA_LENGTH 0
2459 #define MH_OFF_MEDIUM_TYPE 1
2460 #define MH_OFF_DEV_SPECIFIC 2
2461 #define MH_OFF_BDESCS_LENGTH 3
2462 #define MP_OFF_PAGE_NBR 0
2463 #define MP_OFF_PAGE_LENGTH 1
2464
2465 /* Mode header and page bit masks */
2466 #define MH_BIT_WP 0x80
2467 #define MP_MSK_PAGE_NBR 0x3f
2468
2469 /* Don't return block descriptors */
2470 #define MODE_SENSE_OMIT_BDESCS 0x08
2471
2472 #define MODE_SELECT_PAGE_FORMAT 0x10
2473
2474 /* Read a mode page into the tape buffer. The block descriptors are included
2475 if incl_block_descs is true. The page control is ored to the page number
2476 parameter, if necessary. */
2477 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2478 {
2479 unsigned char cmd[MAX_COMMAND_SIZE];
2480 struct st_request *SRpnt;
2481
2482 memset(cmd, 0, MAX_COMMAND_SIZE);
2483 cmd[0] = MODE_SENSE;
2484 if (omit_block_descs)
2485 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2486 cmd[2] = page;
2487 cmd[4] = 255;
2488
2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2490 STp->device->request_queue->rq_timeout, 0, 1);
2491 if (SRpnt == NULL)
2492 return (STp->buffer)->syscall_result;
2493
2494 st_release_request(SRpnt);
2495
2496 return STp->buffer->syscall_result;
2497 }
2498
2499
2500 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2502 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2503 {
2504 int pgo;
2505 unsigned char cmd[MAX_COMMAND_SIZE];
2506 struct st_request *SRpnt;
2507 int timeout;
2508
2509 memset(cmd, 0, MAX_COMMAND_SIZE);
2510 cmd[0] = MODE_SELECT;
2511 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2514
2515 /* Clear reserved fields */
2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2520
2521 timeout = slow ?
2522 STp->long_timeout : STp->device->request_queue->rq_timeout;
2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2524 timeout, 0, 1);
2525 if (SRpnt == NULL)
2526 return (STp->buffer)->syscall_result;
2527
2528 st_release_request(SRpnt);
2529
2530 return STp->buffer->syscall_result;
2531 }
2532
2533
2534 #define COMPRESSION_PAGE 0x0f
2535 #define COMPRESSION_PAGE_LENGTH 16
2536
2537 #define CP_OFF_DCE_DCC 2
2538 #define CP_OFF_C_ALGO 7
2539
2540 #define DCE_MASK 0x80
2541 #define DCC_MASK 0x40
2542 #define RED_MASK 0x60
2543
2544
2545 /* Control the compression with mode page 15. Algorithm not changed if zero.
2546
2547 The block descriptors are read and written because Sony SDT-7000 does not
2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2549 Including block descriptors should not cause any harm to other drives. */
2550
2551 static int st_compression(struct scsi_tape * STp, int state)
2552 {
2553 int retval;
2554 int mpoffs; /* Offset to mode page start */
2555 unsigned char *b_data = (STp->buffer)->b_data;
2556
2557 if (STp->ready != ST_READY)
2558 return (-EIO);
2559
2560 /* Read the current page contents */
2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2562 if (retval) {
2563 DEBC_printk(STp, "Compression mode page not supported.\n");
2564 return (-EIO);
2565 }
2566
2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2568 DEBC_printk(STp, "Compression state is %d.\n",
2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2570
2571 /* Check if compression can be changed */
2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2573 DEBC_printk(STp, "Compression not supported.\n");
2574 return (-EIO);
2575 }
2576
2577 /* Do the change */
2578 if (state) {
2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2580 if (STp->c_algo != 0)
2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2582 }
2583 else {
2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2585 if (STp->c_algo != 0)
2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2587 }
2588
2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2590 if (retval) {
2591 DEBC_printk(STp, "Compression change failed.\n");
2592 return (-EIO);
2593 }
2594 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2595
2596 STp->compression_changed = 1;
2597 return 0;
2598 }
2599
2600
2601 /* Process the load and unload commands (does unload if the load code is zero) */
2602 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2603 {
2604 int retval = (-EIO), timeout;
2605 unsigned char cmd[MAX_COMMAND_SIZE];
2606 struct st_partstat *STps;
2607 struct st_request *SRpnt;
2608
2609 if (STp->ready != ST_READY && !load_code) {
2610 if (STp->ready == ST_NO_TAPE)
2611 return (-ENOMEDIUM);
2612 else
2613 return (-EIO);
2614 }
2615
2616 memset(cmd, 0, MAX_COMMAND_SIZE);
2617 cmd[0] = START_STOP;
2618 if (load_code)
2619 cmd[4] |= 1;
2620 /*
2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2622 */
2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2626 (cmd[4]) ? "" : "un",
2627 load_code - MT_ST_HPLOADER_OFFSET);
2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2629 }
2630 if (STp->immediate) {
2631 cmd[1] = 1; /* Don't wait for completion */
2632 timeout = STp->device->request_queue->rq_timeout;
2633 }
2634 else
2635 timeout = STp->long_timeout;
2636
2637 DEBC(
2638 if (!load_code)
2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2640 else
2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2642 );
2643
2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2645 timeout, MAX_RETRIES, 1);
2646 if (!SRpnt)
2647 return (STp->buffer)->syscall_result;
2648
2649 retval = (STp->buffer)->syscall_result;
2650 st_release_request(SRpnt);
2651
2652 if (!retval) { /* SCSI command successful */
2653
2654 if (!load_code) {
2655 STp->rew_at_close = 0;
2656 STp->ready = ST_NO_TAPE;
2657 }
2658 else {
2659 STp->rew_at_close = STp->autorew_dev;
2660 retval = check_tape(STp, filp);
2661 if (retval > 0)
2662 retval = 0;
2663 }
2664 }
2665 else {
2666 STps = &(STp->ps[STp->partition]);
2667 STps->drv_file = STps->drv_block = (-1);
2668 }
2669
2670 return retval;
2671 }
2672 \f
2673 #if DEBUG
2674 #define ST_DEB_FORWARD 0
2675 #define ST_DEB_BACKWARD 1
2676 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2677 {
2678 s32 sc;
2679
2680 if (!debugging)
2681 return;
2682
2683 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2684 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2685 if (direction)
2686 sc = -sc;
2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2688 direction ? "backward" : "forward", sc, units);
2689 }
2690 #else
2691 #define ST_DEB_FORWARD 0
2692 #define ST_DEB_BACKWARD 1
2693 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2694 #endif
2695
2696
2697 /* Internal ioctl function */
2698 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2699 {
2700 int timeout;
2701 long ltmp;
2702 int ioctl_result;
2703 int chg_eof = 1;
2704 unsigned char cmd[MAX_COMMAND_SIZE];
2705 struct st_request *SRpnt;
2706 struct st_partstat *STps;
2707 int fileno, blkno, at_sm, undone;
2708 int datalen = 0, direction = DMA_NONE;
2709
2710 WARN_ON(STp->buffer->do_dio != 0);
2711 if (STp->ready != ST_READY) {
2712 if (STp->ready == ST_NO_TAPE)
2713 return (-ENOMEDIUM);
2714 else
2715 return (-EIO);
2716 }
2717 timeout = STp->long_timeout;
2718 STps = &(STp->ps[STp->partition]);
2719 fileno = STps->drv_file;
2720 blkno = STps->drv_block;
2721 at_sm = STps->at_sm;
2722
2723 memset(cmd, 0, MAX_COMMAND_SIZE);
2724 switch (cmd_in) {
2725 case MTFSFM:
2726 chg_eof = 0; /* Changed from the FSF after this */
2727 /* fall through */
2728 case MTFSF:
2729 cmd[0] = SPACE;
2730 cmd[1] = 0x01; /* Space FileMarks */
2731 cmd[2] = (arg >> 16);
2732 cmd[3] = (arg >> 8);
2733 cmd[4] = arg;
2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2735 if (fileno >= 0)
2736 fileno += arg;
2737 blkno = 0;
2738 at_sm &= (arg == 0);
2739 break;
2740 case MTBSFM:
2741 chg_eof = 0; /* Changed from the FSF after this */
2742 /* fall through */
2743 case MTBSF:
2744 cmd[0] = SPACE;
2745 cmd[1] = 0x01; /* Space FileMarks */
2746 ltmp = (-arg);
2747 cmd[2] = (ltmp >> 16);
2748 cmd[3] = (ltmp >> 8);
2749 cmd[4] = ltmp;
2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2751 if (fileno >= 0)
2752 fileno -= arg;
2753 blkno = (-1); /* We can't know the block number */
2754 at_sm &= (arg == 0);
2755 break;
2756 case MTFSR:
2757 cmd[0] = SPACE;
2758 cmd[1] = 0x00; /* Space Blocks */
2759 cmd[2] = (arg >> 16);
2760 cmd[3] = (arg >> 8);
2761 cmd[4] = arg;
2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2763 if (blkno >= 0)
2764 blkno += arg;
2765 at_sm &= (arg == 0);
2766 break;
2767 case MTBSR:
2768 cmd[0] = SPACE;
2769 cmd[1] = 0x00; /* Space Blocks */
2770 ltmp = (-arg);
2771 cmd[2] = (ltmp >> 16);
2772 cmd[3] = (ltmp >> 8);
2773 cmd[4] = ltmp;
2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2775 if (blkno >= 0)
2776 blkno -= arg;
2777 at_sm &= (arg == 0);
2778 break;
2779 case MTFSS:
2780 cmd[0] = SPACE;
2781 cmd[1] = 0x04; /* Space Setmarks */
2782 cmd[2] = (arg >> 16);
2783 cmd[3] = (arg >> 8);
2784 cmd[4] = arg;
2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2786 if (arg != 0) {
2787 blkno = fileno = (-1);
2788 at_sm = 1;
2789 }
2790 break;
2791 case MTBSS:
2792 cmd[0] = SPACE;
2793 cmd[1] = 0x04; /* Space Setmarks */
2794 ltmp = (-arg);
2795 cmd[2] = (ltmp >> 16);
2796 cmd[3] = (ltmp >> 8);
2797 cmd[4] = ltmp;
2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2799 if (arg != 0) {
2800 blkno = fileno = (-1);
2801 at_sm = 1;
2802 }
2803 break;
2804 case MTWEOF:
2805 case MTWEOFI:
2806 case MTWSM:
2807 if (STp->write_prot)
2808 return (-EACCES);
2809 cmd[0] = WRITE_FILEMARKS;
2810 if (cmd_in == MTWSM)
2811 cmd[1] = 2;
2812 if (cmd_in == MTWEOFI ||
2813 (cmd_in == MTWEOF && STp->immediate_filemark))
2814 cmd[1] |= 1;
2815 cmd[2] = (arg >> 16);
2816 cmd[3] = (arg >> 8);
2817 cmd[4] = arg;
2818 timeout = STp->device->request_queue->rq_timeout;
2819 DEBC(
2820 if (cmd_in != MTWSM)
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d filemarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 else
2827 st_printk(ST_DEB_MSG, STp,
2828 "Writing %d setmarks.\n",
2829 cmd[2] * 65536 +
2830 cmd[3] * 256 +
2831 cmd[4]);
2832 )
2833 if (fileno >= 0)
2834 fileno += arg;
2835 blkno = 0;
2836 at_sm = (cmd_in == MTWSM);
2837 break;
2838 case MTREW:
2839 cmd[0] = REZERO_UNIT;
2840 if (STp->immediate) {
2841 cmd[1] = 1; /* Don't wait for completion */
2842 timeout = STp->device->request_queue->rq_timeout;
2843 }
2844 DEBC_printk(STp, "Rewinding tape.\n");
2845 fileno = blkno = at_sm = 0;
2846 break;
2847 case MTNOP:
2848 DEBC_printk(STp, "No op on tape.\n");
2849 return 0; /* Should do something ? */
2850 break;
2851 case MTRETEN:
2852 cmd[0] = START_STOP;
2853 if (STp->immediate) {
2854 cmd[1] = 1; /* Don't wait for completion */
2855 timeout = STp->device->request_queue->rq_timeout;
2856 }
2857 cmd[4] = 3;
2858 DEBC_printk(STp, "Retensioning tape.\n");
2859 fileno = blkno = at_sm = 0;
2860 break;
2861 case MTEOM:
2862 if (!STp->fast_mteom) {
2863 /* space to the end of tape */
2864 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2865 fileno = STps->drv_file;
2866 if (STps->eof >= ST_EOD_1)
2867 return 0;
2868 /* The next lines would hide the number of spaced FileMarks
2869 That's why I inserted the previous lines. I had no luck
2870 with detecting EOM with FSF, so we go now to EOM.
2871 Joerg Weule */
2872 } else
2873 fileno = (-1);
2874 cmd[0] = SPACE;
2875 cmd[1] = 3;
2876 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2877 blkno = -1;
2878 at_sm = 0;
2879 break;
2880 case MTERASE:
2881 if (STp->write_prot)
2882 return (-EACCES);
2883 cmd[0] = ERASE;
2884 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2885 if (STp->immediate) {
2886 cmd[1] |= 2; /* Don't wait for completion */
2887 timeout = STp->device->request_queue->rq_timeout;
2888 }
2889 else
2890 timeout = STp->long_timeout * 8;
2891
2892 DEBC_printk(STp, "Erasing tape.\n");
2893 fileno = blkno = at_sm = 0;
2894 break;
2895 case MTSETBLK: /* Set block length */
2896 case MTSETDENSITY: /* Set tape density */
2897 case MTSETDRVBUFFER: /* Set drive buffering */
2898 case SET_DENS_AND_BLK: /* Set density and block size */
2899 chg_eof = 0;
2900 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2901 return (-EIO); /* Not allowed if data in buffer */
2902 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2903 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2904 STp->max_block > 0 &&
2905 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2906 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2907 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2908 return (-EINVAL);
2909 }
2910 cmd[0] = MODE_SELECT;
2911 if ((STp->use_pf & USE_PF))
2912 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2913 cmd[4] = datalen = 12;
2914 direction = DMA_TO_DEVICE;
2915
2916 memset((STp->buffer)->b_data, 0, 12);
2917 if (cmd_in == MTSETDRVBUFFER)
2918 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2919 else
2920 (STp->buffer)->b_data[2] =
2921 STp->drv_buffer << 4;
2922 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2923 if (cmd_in == MTSETDENSITY) {
2924 (STp->buffer)->b_data[4] = arg;
2925 STp->density_changed = 1; /* At least we tried ;-) */
2926 } else if (cmd_in == SET_DENS_AND_BLK)
2927 (STp->buffer)->b_data[4] = arg >> 24;
2928 else
2929 (STp->buffer)->b_data[4] = STp->density;
2930 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2931 ltmp = arg & MT_ST_BLKSIZE_MASK;
2932 if (cmd_in == MTSETBLK)
2933 STp->blksize_changed = 1; /* At least we tried ;-) */
2934 } else
2935 ltmp = STp->block_size;
2936 (STp->buffer)->b_data[9] = (ltmp >> 16);
2937 (STp->buffer)->b_data[10] = (ltmp >> 8);
2938 (STp->buffer)->b_data[11] = ltmp;
2939 timeout = STp->device->request_queue->rq_timeout;
2940 DEBC(
2941 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting block size to %d bytes.\n",
2944 (STp->buffer)->b_data[9] * 65536 +
2945 (STp->buffer)->b_data[10] * 256 +
2946 (STp->buffer)->b_data[11]);
2947 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2948 st_printk(ST_DEB_MSG, STp,
2949 "Setting density code to %x.\n",
2950 (STp->buffer)->b_data[4]);
2951 if (cmd_in == MTSETDRVBUFFER)
2952 st_printk(ST_DEB_MSG, STp,
2953 "Setting drive buffer code to %d.\n",
2954 ((STp->buffer)->b_data[2] >> 4) & 7);
2955 )
2956 break;
2957 default:
2958 return (-ENOSYS);
2959 }
2960
2961 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2962 timeout, MAX_RETRIES, 1);
2963 if (!SRpnt)
2964 return (STp->buffer)->syscall_result;
2965
2966 ioctl_result = (STp->buffer)->syscall_result;
2967
2968 if (!ioctl_result) { /* SCSI command successful */
2969 st_release_request(SRpnt);
2970 SRpnt = NULL;
2971 STps->drv_block = blkno;
2972 STps->drv_file = fileno;
2973 STps->at_sm = at_sm;
2974
2975 if (cmd_in == MTBSFM)
2976 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2977 else if (cmd_in == MTFSFM)
2978 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2979
2980 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2981 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2982 if (STp->block_size != 0) {
2983 (STp->buffer)->buffer_blocks =
2984 (STp->buffer)->buffer_size / STp->block_size;
2985 }
2986 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2987 if (cmd_in == SET_DENS_AND_BLK)
2988 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2989 } else if (cmd_in == MTSETDRVBUFFER)
2990 STp->drv_buffer = (arg & 7);
2991 else if (cmd_in == MTSETDENSITY)
2992 STp->density = arg;
2993
2994 if (cmd_in == MTEOM)
2995 STps->eof = ST_EOD;
2996 else if (cmd_in == MTFSF)
2997 STps->eof = ST_FM;
2998 else if (chg_eof)
2999 STps->eof = ST_NOEOF;
3000
3001 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3002 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3003 } else { /* SCSI command was not completely successful. Don't return
3004 from this block without releasing the SCSI command block! */
3005 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3006
3007 if (cmdstatp->flags & SENSE_EOM) {
3008 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3009 cmd_in != MTBSR && cmd_in != MTBSS)
3010 STps->eof = ST_EOM_OK;
3011 STps->drv_block = 0;
3012 }
3013
3014 if (cmdstatp->remainder_valid)
3015 undone = (int)cmdstatp->uremainder64;
3016 else
3017 undone = 0;
3018
3019 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3020 cmdstatp->have_sense &&
3021 (cmdstatp->flags & SENSE_EOM)) {
3022 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3023 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3024 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3025 STps->eof = ST_NOEOF;
3026 } else { /* Writing EOF(s) failed */
3027 if (fileno >= 0)
3028 fileno -= undone;
3029 if (undone < arg)
3030 STps->eof = ST_NOEOF;
3031 }
3032 STps->drv_file = fileno;
3033 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3034 if (fileno >= 0)
3035 STps->drv_file = fileno - undone;
3036 else
3037 STps->drv_file = fileno;
3038 STps->drv_block = -1;
3039 STps->eof = ST_NOEOF;
3040 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3041 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3042 undone = (-undone);
3043 if (STps->drv_file >= 0)
3044 STps->drv_file = fileno + undone;
3045 STps->drv_block = 0;
3046 STps->eof = ST_NOEOF;
3047 } else if (cmd_in == MTFSR) {
3048 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3049 if (STps->drv_file >= 0)
3050 STps->drv_file++;
3051 STps->drv_block = 0;
3052 STps->eof = ST_FM;
3053 } else {
3054 if (blkno >= undone)
3055 STps->drv_block = blkno - undone;
3056 else
3057 STps->drv_block = (-1);
3058 STps->eof = ST_NOEOF;
3059 }
3060 } else if (cmd_in == MTBSR) {
3061 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3062 STps->drv_file--;
3063 STps->drv_block = (-1);
3064 } else {
3065 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3066 undone = (-undone);
3067 if (STps->drv_block >= 0)
3068 STps->drv_block = blkno + undone;
3069 }
3070 STps->eof = ST_NOEOF;
3071 } else if (cmd_in == MTEOM) {
3072 STps->drv_file = (-1);
3073 STps->drv_block = (-1);
3074 STps->eof = ST_EOD;
3075 } else if (cmd_in == MTSETBLK ||
3076 cmd_in == MTSETDENSITY ||
3077 cmd_in == MTSETDRVBUFFER ||
3078 cmd_in == SET_DENS_AND_BLK) {
3079 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3080 !(STp->use_pf & PF_TESTED)) {
3081 /* Try the other possible state of Page Format if not
3082 already tried */
3083 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3084 st_release_request(SRpnt);
3085 SRpnt = NULL;
3086 return st_int_ioctl(STp, cmd_in, arg);
3087 }
3088 } else if (chg_eof)
3089 STps->eof = ST_NOEOF;
3090
3091 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3092 STps->eof = ST_EOD;
3093
3094 st_release_request(SRpnt);
3095 SRpnt = NULL;
3096 }
3097
3098 return ioctl_result;
3099 }
3100 \f
3101
3102 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3103 structure. */
3104
3105 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3106 int logical)
3107 {
3108 int result;
3109 unsigned char scmd[MAX_COMMAND_SIZE];
3110 struct st_request *SRpnt;
3111
3112 if (STp->ready != ST_READY)
3113 return (-EIO);
3114
3115 memset(scmd, 0, MAX_COMMAND_SIZE);
3116 if ((STp->device)->scsi_level < SCSI_2) {
3117 scmd[0] = QFA_REQUEST_BLOCK;
3118 scmd[4] = 3;
3119 } else {
3120 scmd[0] = READ_POSITION;
3121 if (!logical && !STp->scsi2_logical)
3122 scmd[1] = 1;
3123 }
3124 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3125 STp->device->request_queue->rq_timeout,
3126 MAX_READY_RETRIES, 1);
3127 if (!SRpnt)
3128 return (STp->buffer)->syscall_result;
3129
3130 if ((STp->buffer)->syscall_result != 0 ||
3131 (STp->device->scsi_level >= SCSI_2 &&
3132 ((STp->buffer)->b_data[0] & 4) != 0)) {
3133 *block = *partition = 0;
3134 DEBC_printk(STp, " Can't read tape position.\n");
3135 result = (-EIO);
3136 } else {
3137 result = 0;
3138 if ((STp->device)->scsi_level < SCSI_2) {
3139 *block = ((STp->buffer)->b_data[0] << 16)
3140 + ((STp->buffer)->b_data[1] << 8)
3141 + (STp->buffer)->b_data[2];
3142 *partition = 0;
3143 } else {
3144 *block = ((STp->buffer)->b_data[4] << 24)
3145 + ((STp->buffer)->b_data[5] << 16)
3146 + ((STp->buffer)->b_data[6] << 8)
3147 + (STp->buffer)->b_data[7];
3148 *partition = (STp->buffer)->b_data[1];
3149 if (((STp->buffer)->b_data[0] & 0x80) &&
3150 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3151 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3152 }
3153 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3154 *block, *partition);
3155 }
3156 st_release_request(SRpnt);
3157 SRpnt = NULL;
3158
3159 return result;
3160 }
3161
3162
3163 /* Set the tape block and partition. Negative partition means that only the
3164 block should be set in vendor specific way. */
3165 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3166 int logical)
3167 {
3168 struct st_partstat *STps;
3169 int result, p;
3170 unsigned int blk;
3171 int timeout;
3172 unsigned char scmd[MAX_COMMAND_SIZE];
3173 struct st_request *SRpnt;
3174
3175 if (STp->ready != ST_READY)
3176 return (-EIO);
3177 timeout = STp->long_timeout;
3178 STps = &(STp->ps[STp->partition]);
3179
3180 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3181 block, partition);
3182 DEB(if (partition < 0)
3183 return (-EIO); )
3184
3185 /* Update the location at the partition we are leaving */
3186 if ((!STp->can_partitions && partition != 0) ||
3187 partition >= ST_NBR_PARTITIONS)
3188 return (-EINVAL);
3189 if (partition != STp->partition) {
3190 if (get_location(STp, &blk, &p, 1))
3191 STps->last_block_valid = 0;
3192 else {
3193 STps->last_block_valid = 1;
3194 STps->last_block_visited = blk;
3195 DEBC_printk(STp, "Visited block %d for "
3196 "partition %d saved.\n",
3197 blk, STp->partition);
3198 }
3199 }
3200
3201 memset(scmd, 0, MAX_COMMAND_SIZE);
3202 if ((STp->device)->scsi_level < SCSI_2) {
3203 scmd[0] = QFA_SEEK_BLOCK;
3204 scmd[2] = (block >> 16);
3205 scmd[3] = (block >> 8);
3206 scmd[4] = block;
3207 scmd[5] = 0;
3208 } else {
3209 scmd[0] = SEEK_10;
3210 scmd[3] = (block >> 24);
3211 scmd[4] = (block >> 16);
3212 scmd[5] = (block >> 8);
3213 scmd[6] = block;
3214 if (!logical && !STp->scsi2_logical)
3215 scmd[1] = 4;
3216 if (STp->partition != partition) {
3217 scmd[1] |= 2;
3218 scmd[8] = partition;
3219 DEBC_printk(STp, "Trying to change partition "
3220 "from %d to %d\n", STp->partition,
3221 partition);
3222 }
3223 }
3224 if (STp->immediate) {
3225 scmd[1] |= 1; /* Don't wait for completion */
3226 timeout = STp->device->request_queue->rq_timeout;
3227 }
3228
3229 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3230 timeout, MAX_READY_RETRIES, 1);
3231 if (!SRpnt)
3232 return (STp->buffer)->syscall_result;
3233
3234 STps->drv_block = STps->drv_file = (-1);
3235 STps->eof = ST_NOEOF;
3236 if ((STp->buffer)->syscall_result != 0) {
3237 result = (-EIO);
3238 if (STp->can_partitions &&
3239 (STp->device)->scsi_level >= SCSI_2 &&
3240 (p = find_partition(STp)) >= 0)
3241 STp->partition = p;
3242 } else {
3243 if (STp->can_partitions) {
3244 STp->partition = partition;
3245 STps = &(STp->ps[partition]);
3246 if (!STps->last_block_valid ||
3247 STps->last_block_visited != block) {
3248 STps->at_sm = 0;
3249 STps->rw = ST_IDLE;
3250 }
3251 } else
3252 STps->at_sm = 0;
3253 if (block == 0)
3254 STps->drv_block = STps->drv_file = 0;
3255 result = 0;
3256 }
3257
3258 st_release_request(SRpnt);
3259 SRpnt = NULL;
3260
3261 return result;
3262 }
3263
3264
3265 /* Find the current partition number for the drive status. Called from open and
3266 returns either partition number of negative error code. */
3267 static int find_partition(struct scsi_tape *STp)
3268 {
3269 int i, partition;
3270 unsigned int block;
3271
3272 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3273 return i;
3274 if (partition >= ST_NBR_PARTITIONS)
3275 return (-EIO);
3276 return partition;
3277 }
3278
3279
3280 /* Change the partition if necessary */
3281 static int switch_partition(struct scsi_tape *STp)
3282 {
3283 struct st_partstat *STps;
3284
3285 if (STp->partition == STp->new_partition)
3286 return 0;
3287 STps = &(STp->ps[STp->new_partition]);
3288 if (!STps->last_block_valid)
3289 STps->last_block_visited = 0;
3290 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3291 }
3292 \f
3293 /* Functions for reading and writing the medium partition mode page. */
3294
3295 #define PART_PAGE 0x11
3296 #define PART_PAGE_FIXED_LENGTH 8
3297
3298 #define PP_OFF_MAX_ADD_PARTS 2
3299 #define PP_OFF_NBR_ADD_PARTS 3
3300 #define PP_OFF_FLAGS 4
3301 #define PP_OFF_PART_UNITS 6
3302 #define PP_OFF_RESERVED 7
3303
3304 #define PP_BIT_IDP 0x20
3305 #define PP_BIT_FDP 0x80
3306 #define PP_MSK_PSUM_MB 0x10
3307 #define PP_MSK_PSUM_UNITS 0x18
3308 #define PP_MSK_POFM 0x04
3309
3310 /* Get the number of partitions on the tape. As a side effect reads the
3311 mode page into the tape buffer. */
3312 static int nbr_partitions(struct scsi_tape *STp)
3313 {
3314 int result;
3315
3316 if (STp->ready != ST_READY)
3317 return (-EIO);
3318
3319 result = read_mode_page(STp, PART_PAGE, 1);
3320
3321 if (result) {
3322 DEBC_printk(STp, "Can't read medium partition page.\n");
3323 result = (-EIO);
3324 } else {
3325 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3326 PP_OFF_NBR_ADD_PARTS] + 1;
3327 DEBC_printk(STp, "Number of partitions %d.\n", result);
3328 }
3329
3330 return result;
3331 }
3332
3333
3334 static int format_medium(struct scsi_tape *STp, int format)
3335 {
3336 int result = 0;
3337 int timeout = STp->long_timeout;
3338 unsigned char scmd[MAX_COMMAND_SIZE];
3339 struct st_request *SRpnt;
3340
3341 memset(scmd, 0, MAX_COMMAND_SIZE);
3342 scmd[0] = FORMAT_UNIT;
3343 scmd[2] = format;
3344 if (STp->immediate) {
3345 scmd[1] |= 1; /* Don't wait for completion */
3346 timeout = STp->device->request_queue->rq_timeout;
3347 }
3348 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3349 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3350 timeout, MAX_RETRIES, 1);
3351 if (!SRpnt)
3352 result = STp->buffer->syscall_result;
3353 return result;
3354 }
3355
3356
3357 /* Partition the tape into two partitions if size > 0 or one partition if
3358 size == 0.
3359
3360 The block descriptors are read and written because Sony SDT-7000 does not
3361 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3362
3363 My HP C1533A drive returns only one partition size field. This is used to
3364 set the size of partition 1. There is no size field for the default partition.
3365 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3366 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3367 The following algorithm is used to accommodate both drives: if the number of
3368 partition size fields is greater than the maximum number of additional partitions
3369 in the mode page, the second field is used. Otherwise the first field is used.
3370
3371 For Seagate DDS drives the page length must be 8 when no partitions is defined
3372 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3373 is acceptable also to some other old drives and enforced if the first partition
3374 size field is used for the first additional partition size.
3375
3376 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3377 */
3378 static int partition_tape(struct scsi_tape *STp, int size)
3379 {
3380 int result;
3381 int target_partition;
3382 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3383 int pgo, psd_cnt, psdo;
3384 int psum = PP_MSK_PSUM_MB, units = 0;
3385 unsigned char *bp;
3386
3387 result = read_mode_page(STp, PART_PAGE, 0);
3388 if (result) {
3389 DEBC_printk(STp, "Can't read partition mode page.\n");
3390 return result;
3391 }
3392 target_partition = 1;
3393 if (size < 0) {
3394 target_partition = 0;
3395 size = -size;
3396 }
3397
3398 /* The mode page is in the buffer. Let's modify it and write it. */
3399 bp = (STp->buffer)->b_data;
3400 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3401 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3402 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3403
3404 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3405
3406 if (scsi3) {
3407 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3408 if (needs_format && size == 0) {
3409 /* No need to write the mode page when clearing
3410 * partitioning
3411 */
3412 DEBC_printk(STp, "Formatting tape with one partition.\n");
3413 result = format_medium(STp, 0);
3414 goto out;
3415 }
3416 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3417 psd_cnt = 2;
3418 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3419 /* Use units scaling for large partitions if the device
3420 * suggests it and no precision lost. Required for IBM
3421 * TS1140/50 drives that don't support MB units.
3422 */
3423 if (size >= 1000 && (size % 1000) == 0) {
3424 size /= 1000;
3425 psum = PP_MSK_PSUM_UNITS;
3426 units = 9; /* GB */
3427 }
3428 }
3429 /* Try it anyway if too large to specify in MB */
3430 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3431 size /= 1000;
3432 psum = PP_MSK_PSUM_UNITS;
3433 units = 9; /* GB */
3434 }
3435 }
3436
3437 if (size >= 65535 || /* Does not fit into two bytes */
3438 (target_partition == 0 && psd_cnt < 2)) {
3439 result = -EINVAL;
3440 goto out;
3441 }
3442
3443 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3444 /* The second condition is for HP DDS which use only one partition size
3445 * descriptor
3446 */
3447 if (target_partition > 0 &&
3448 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3449 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3450 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3451 psdo += 2;
3452 }
3453 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3454
3455 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3456 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3457 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3458
3459 if (size == 0) {
3460 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3461 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3462 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3463 DEBC_printk(STp, "Formatting tape with one partition.\n");
3464 } else {
3465 bp[psdo] = (size >> 8) & 0xff;
3466 bp[psdo + 1] = size & 0xff;
3467 if (target_partition == 0)
3468 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3469 bp[pgo + 3] = 1;
3470 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3471 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3472 DEBC_printk(STp,
3473 "Formatting tape with two partitions (%i = %d MB).\n",
3474 target_partition, units > 0 ? size * 1000 : size);
3475 }
3476 bp[pgo + PP_OFF_PART_UNITS] = 0;
3477 bp[pgo + PP_OFF_RESERVED] = 0;
3478 if (size != 1 || units != 0) {
3479 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3480 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3481 bp[pgo + PP_OFF_PART_UNITS] = units;
3482 } else
3483 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3484 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3485 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3486
3487 result = write_mode_page(STp, PART_PAGE, 1);
3488
3489 if (!result && needs_format)
3490 result = format_medium(STp, 1);
3491
3492 if (result) {
3493 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3494 result = (-EIO);
3495 }
3496
3497 out:
3498 return result;
3499 }
3500 \f
3501
3502
3503 /* The ioctl command */
3504 static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
3505 {
3506 int i, cmd_nr, cmd_type, bt;
3507 int retval = 0;
3508 unsigned int blk;
3509 struct scsi_tape *STp = file->private_data;
3510 struct st_modedef *STm;
3511 struct st_partstat *STps;
3512
3513 if (mutex_lock_interruptible(&STp->lock))
3514 return -ERESTARTSYS;
3515
3516 DEB(
3517 if (debugging && !STp->in_use) {
3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3519 retval = (-EIO);
3520 goto out;
3521 } ) /* end DEB */
3522
3523 STm = &(STp->modes[STp->current_mode]);
3524 STps = &(STp->ps[STp->partition]);
3525
3526 /*
3527 * If we are in the middle of error recovery, don't let anyone
3528 * else try and use this device. Also, if error recovery fails, it
3529 * may try and take the device offline, in which case all further
3530 * access to the device is prohibited.
3531 */
3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3533 file->f_flags & O_NDELAY);
3534 if (retval)
3535 goto out;
3536
3537 cmd_type = _IOC_TYPE(cmd_in);
3538 cmd_nr = _IOC_NR(cmd_in);
3539
3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3541 struct mtop mtc;
3542
3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3544 retval = (-EINVAL);
3545 goto out;
3546 }
3547
3548 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3549 if (i) {
3550 retval = (-EFAULT);
3551 goto out;
3552 }
3553
3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3555 st_printk(KERN_WARNING, STp,
3556 "MTSETDRVBUFFER only allowed for root.\n");
3557 retval = (-EPERM);
3558 goto out;
3559 }
3560 if (!STm->defined &&
3561 (mtc.mt_op != MTSETDRVBUFFER &&
3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3563 retval = (-ENXIO);
3564 goto out;
3565 }
3566
3567 if (!STp->pos_unknown) {
3568
3569 if (STps->eof == ST_FM_HIT) {
3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3571 mtc.mt_op == MTEOM) {
3572 mtc.mt_count -= 1;
3573 if (STps->drv_file >= 0)
3574 STps->drv_file += 1;
3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3576 mtc.mt_count += 1;
3577 if (STps->drv_file >= 0)
3578 STps->drv_file += 1;
3579 }
3580 }
3581
3582 if (mtc.mt_op == MTSEEK) {
3583 /* Old position must be restored if partition will be
3584 changed */
3585 i = !STp->can_partitions ||
3586 (STp->new_partition != STp->partition);
3587 } else {
3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3593 mtc.mt_op == MTCOMPRESSION;
3594 }
3595 i = flush_buffer(STp, i);
3596 if (i < 0) {
3597 retval = i;
3598 goto out;
3599 }
3600 if (STps->rw == ST_WRITING &&
3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3602 mtc.mt_op == MTSEEK ||
3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3604 i = st_int_ioctl(STp, MTWEOF, 1);
3605 if (i < 0) {
3606 retval = i;
3607 goto out;
3608 }
3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3610 mtc.mt_count++;
3611 STps->rw = ST_IDLE;
3612 }
3613
3614 } else {
3615 /*
3616 * If there was a bus reset, block further access
3617 * to this device. If the user wants to rewind the tape,
3618 * then reset the flag and allow access again.
3619 */
3620 if (mtc.mt_op != MTREW &&
3621 mtc.mt_op != MTOFFL &&
3622 mtc.mt_op != MTRETEN &&
3623 mtc.mt_op != MTERASE &&
3624 mtc.mt_op != MTSEEK &&
3625 mtc.mt_op != MTEOM) {
3626 retval = (-EIO);
3627 goto out;
3628 }
3629 reset_state(STp);
3630 /* remove this when the midlevel properly clears was_reset */
3631 STp->device->was_reset = 0;
3632 }
3633
3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3638
3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3640 do_door_lock(STp, 0); /* Ignore result! */
3641
3642 if (mtc.mt_op == MTSETDRVBUFFER &&
3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3644 retval = st_set_options(STp, mtc.mt_count);
3645 goto out;
3646 }
3647
3648 if (mtc.mt_op == MTSETPART) {
3649 if (!STp->can_partitions ||
3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3651 retval = (-EINVAL);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions &&
3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3656 retval = (-EIO);
3657 goto out;
3658 }
3659 if (mtc.mt_count >= STp->nbr_partitions) {
3660 retval = (-EINVAL);
3661 goto out;
3662 }
3663 STp->new_partition = mtc.mt_count;
3664 retval = 0;
3665 goto out;
3666 }
3667
3668 if (mtc.mt_op == MTMKPART) {
3669 if (!STp->can_partitions) {
3670 retval = (-EINVAL);
3671 goto out;
3672 }
3673 i = do_load_unload(STp, file, 1);
3674 if (i < 0) {
3675 retval = i;
3676 goto out;
3677 }
3678 i = partition_tape(STp, mtc.mt_count);
3679 if (i < 0) {
3680 retval = i;
3681 goto out;
3682 }
3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3684 STp->ps[i].rw = ST_IDLE;
3685 STp->ps[i].at_sm = 0;
3686 STp->ps[i].last_block_valid = 0;
3687 }
3688 STp->partition = STp->new_partition = 0;
3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3690 STps->drv_block = STps->drv_file = 0;
3691 retval = 0;
3692 goto out;
3693 }
3694
3695 if (mtc.mt_op == MTSEEK) {
3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3697 if (!STp->can_partitions)
3698 STp->ps[0].rw = ST_IDLE;
3699 retval = i;
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3704 retval = do_load_unload(STp, file, 0);
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOAD) {
3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3710 goto out;
3711 }
3712
3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3715 goto out;
3716 }
3717
3718 if (STp->can_partitions && STp->ready == ST_READY &&
3719 (i = switch_partition(STp)) < 0) {
3720 retval = i;
3721 goto out;
3722 }
3723
3724 if (mtc.mt_op == MTCOMPRESSION)
3725 retval = st_compression(STp, (mtc.mt_count & 1));
3726 else
3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3728 goto out;
3729 }
3730 if (!STm->defined) {
3731 retval = (-ENXIO);
3732 goto out;
3733 }
3734
3735 if ((i = flush_buffer(STp, 0)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739 if (STp->can_partitions &&
3740 (i = switch_partition(STp)) < 0) {
3741 retval = i;
3742 goto out;
3743 }
3744
3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3746 struct mtget mt_status;
3747
3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3749 retval = (-EINVAL);
3750 goto out;
3751 }
3752
3753 mt_status.mt_type = STp->tape_type;
3754 mt_status.mt_dsreg =
3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3757 mt_status.mt_blkno = STps->drv_block;
3758 mt_status.mt_fileno = STps->drv_file;
3759 if (STp->block_size != 0) {
3760 if (STps->rw == ST_WRITING)
3761 mt_status.mt_blkno +=
3762 (STp->buffer)->buffer_bytes / STp->block_size;
3763 else if (STps->rw == ST_READING)
3764 mt_status.mt_blkno -=
3765 ((STp->buffer)->buffer_bytes +
3766 STp->block_size - 1) / STp->block_size;
3767 }
3768
3769 mt_status.mt_gstat = 0;
3770 if (STp->drv_write_prot)
3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3772 if (mt_status.mt_blkno == 0) {
3773 if (mt_status.mt_fileno == 0)
3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3775 else
3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3777 }
3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3779 mt_status.mt_resid = STp->partition;
3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3782 else if (STps->eof >= ST_EOM_OK)
3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3784 if (STp->density == 1)
3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3786 else if (STp->density == 2)
3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3788 else if (STp->density == 3)
3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3790 if (STp->ready == ST_READY)
3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3792 if (STp->ready == ST_NO_TAPE)
3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3794 if (STps->at_sm)
3795 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3796 if (STm->do_async_writes ||
3797 (STm->do_buffer_writes && STp->block_size != 0) ||
3798 STp->drv_buffer != 0)
3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3800 if (STp->cleaning_req)
3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3802
3803 retval = put_user_mtget(p, &mt_status);
3804 if (retval)
3805 goto out;
3806
3807 STp->recover_reg = 0; /* Clear after read */
3808 goto out;
3809 } /* End of MTIOCGET */
3810 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3811 struct mtpos mt_pos;
3812 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3813 retval = (-EINVAL);
3814 goto out;
3815 }
3816 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3817 retval = i;
3818 goto out;
3819 }
3820 mt_pos.mt_blkno = blk;
3821 retval = put_user_mtpos(p, &mt_pos);
3822 goto out;
3823 }
3824 mutex_unlock(&STp->lock);
3825 switch (cmd_in) {
3826 case SCSI_IOCTL_STOP_UNIT:
3827 /* unload */
3828 retval = scsi_ioctl(STp->device, cmd_in, p);
3829 if (!retval) {
3830 STp->rew_at_close = 0;
3831 STp->ready = ST_NO_TAPE;
3832 }
3833 return retval;
3834
3835 case SCSI_IOCTL_GET_IDLUN:
3836 case SCSI_IOCTL_GET_BUS_NUMBER:
3837 break;
3838
3839 default:
3840 if ((cmd_in == SG_IO ||
3841 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3842 cmd_in == CDROM_SEND_PACKET) &&
3843 !capable(CAP_SYS_RAWIO))
3844 i = -EPERM;
3845 else
3846 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3847 file->f_mode, cmd_in, p);
3848 if (i != -ENOTTY)
3849 return i;
3850 break;
3851 }
3852 return -ENOTTY;
3853
3854 out:
3855 mutex_unlock(&STp->lock);
3856 return retval;
3857 }
3858
3859 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3860 {
3861 void __user *p = (void __user *)arg;
3862 struct scsi_tape *STp = file->private_data;
3863 int ret;
3864
3865 ret = st_ioctl_common(file, cmd_in, p);
3866 if (ret != -ENOTTY)
3867 return ret;
3868
3869 return scsi_ioctl(STp->device, cmd_in, p);
3870 }
3871
3872 #ifdef CONFIG_COMPAT
3873 static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3874 {
3875 void __user *p = compat_ptr(arg);
3876 struct scsi_tape *STp = file->private_data;
3877 int ret;
3878
3879 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3880 switch (cmd_in) {
3881 case MTIOCPOS32:
3882 return st_ioctl_common(file, MTIOCPOS, p);
3883 case MTIOCGET32:
3884 return st_ioctl_common(file, MTIOCGET, p);
3885 }
3886
3887 ret = st_ioctl_common(file, cmd_in, p);
3888 if (ret != -ENOTTY)
3889 return ret;
3890
3891 return scsi_compat_ioctl(STp->device, cmd_in, p);
3892 }
3893 #endif
3894
3895 \f
3896
3897 /* Try to allocate a new tape buffer. Calling function must not hold
3898 dev_arr_lock. */
3899 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3900 {
3901 struct st_buffer *tb;
3902
3903 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3904 if (!tb) {
3905 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3906 return NULL;
3907 }
3908 tb->frp_segs = 0;
3909 tb->use_sg = max_sg;
3910 tb->dma = need_dma;
3911 tb->buffer_size = 0;
3912
3913 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3914 GFP_KERNEL);
3915 if (!tb->reserved_pages) {
3916 kfree(tb);
3917 return NULL;
3918 }
3919
3920 return tb;
3921 }
3922
3923
3924 /* Try to allocate enough space in the tape buffer */
3925 #define ST_MAX_ORDER 6
3926
3927 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3928 {
3929 int segs, max_segs, b_size, order, got;
3930 gfp_t priority;
3931
3932 if (new_size <= STbuffer->buffer_size)
3933 return 1;
3934
3935 if (STbuffer->buffer_size <= PAGE_SIZE)
3936 normalize_buffer(STbuffer); /* Avoid extra segment */
3937
3938 max_segs = STbuffer->use_sg;
3939
3940 priority = GFP_KERNEL | __GFP_NOWARN;
3941 if (need_dma)
3942 priority |= GFP_DMA;
3943
3944 if (STbuffer->cleared)
3945 priority |= __GFP_ZERO;
3946
3947 if (STbuffer->frp_segs) {
3948 order = STbuffer->reserved_page_order;
3949 b_size = PAGE_SIZE << order;
3950 } else {
3951 for (b_size = PAGE_SIZE, order = 0;
3952 order < ST_MAX_ORDER &&
3953 max_segs * (PAGE_SIZE << order) < new_size;
3954 order++, b_size *= 2)
3955 ; /* empty */
3956 STbuffer->reserved_page_order = order;
3957 }
3958 if (max_segs * (PAGE_SIZE << order) < new_size) {
3959 if (order == ST_MAX_ORDER)
3960 return 0;
3961 normalize_buffer(STbuffer);
3962 return enlarge_buffer(STbuffer, new_size, need_dma);
3963 }
3964
3965 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3966 segs < max_segs && got < new_size;) {
3967 struct page *page;
3968
3969 page = alloc_pages(priority, order);
3970 if (!page) {
3971 DEB(STbuffer->buffer_size = got);
3972 normalize_buffer(STbuffer);
3973 return 0;
3974 }
3975
3976 STbuffer->frp_segs += 1;
3977 got += b_size;
3978 STbuffer->buffer_size = got;
3979 STbuffer->reserved_pages[segs] = page;
3980 segs++;
3981 }
3982 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3983
3984 return 1;
3985 }
3986
3987
3988 /* Make sure that no data from previous user is in the internal buffer */
3989 static void clear_buffer(struct st_buffer * st_bp)
3990 {
3991 int i;
3992
3993 for (i=0; i < st_bp->frp_segs; i++)
3994 memset(page_address(st_bp->reserved_pages[i]), 0,
3995 PAGE_SIZE << st_bp->reserved_page_order);
3996 st_bp->cleared = 1;
3997 }
3998
3999
4000 /* Release the extra buffer */
4001 static void normalize_buffer(struct st_buffer * STbuffer)
4002 {
4003 int i, order = STbuffer->reserved_page_order;
4004
4005 for (i = 0; i < STbuffer->frp_segs; i++) {
4006 __free_pages(STbuffer->reserved_pages[i], order);
4007 STbuffer->buffer_size -= (PAGE_SIZE << order);
4008 }
4009 STbuffer->frp_segs = 0;
4010 STbuffer->sg_segs = 0;
4011 STbuffer->reserved_page_order = 0;
4012 STbuffer->map_data.offset = 0;
4013 }
4014
4015
4016 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
4017 negative error code. */
4018 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
4019 {
4020 int i, cnt, res, offset;
4021 int length = PAGE_SIZE << st_bp->reserved_page_order;
4022
4023 for (i = 0, offset = st_bp->buffer_bytes;
4024 i < st_bp->frp_segs && offset >= length; i++)
4025 offset -= length;
4026 if (i == st_bp->frp_segs) { /* Should never happen */
4027 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4028 return (-EIO);
4029 }
4030 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4031 struct page *page = st_bp->reserved_pages[i];
4032 cnt = length - offset < do_count ? length - offset : do_count;
4033 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4034 if (res)
4035 return (-EFAULT);
4036 do_count -= cnt;
4037 st_bp->buffer_bytes += cnt;
4038 ubp += cnt;
4039 offset = 0;
4040 }
4041 if (do_count) /* Should never happen */
4042 return (-EIO);
4043
4044 return 0;
4045 }
4046
4047
4048 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4049 negative error code. */
4050 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4051 {
4052 int i, cnt, res, offset;
4053 int length = PAGE_SIZE << st_bp->reserved_page_order;
4054
4055 for (i = 0, offset = st_bp->read_pointer;
4056 i < st_bp->frp_segs && offset >= length; i++)
4057 offset -= length;
4058 if (i == st_bp->frp_segs) { /* Should never happen */
4059 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4060 return (-EIO);
4061 }
4062 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4063 struct page *page = st_bp->reserved_pages[i];
4064 cnt = length - offset < do_count ? length - offset : do_count;
4065 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4066 if (res)
4067 return (-EFAULT);
4068 do_count -= cnt;
4069 st_bp->buffer_bytes -= cnt;
4070 st_bp->read_pointer += cnt;
4071 ubp += cnt;
4072 offset = 0;
4073 }
4074 if (do_count) /* Should never happen */
4075 return (-EIO);
4076
4077 return 0;
4078 }
4079
4080
4081 /* Move data towards start of buffer */
4082 static void move_buffer_data(struct st_buffer * st_bp, int offset)
4083 {
4084 int src_seg, dst_seg, src_offset = 0, dst_offset;
4085 int count, total;
4086 int length = PAGE_SIZE << st_bp->reserved_page_order;
4087
4088 if (offset == 0)
4089 return;
4090
4091 total=st_bp->buffer_bytes - offset;
4092 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4093 src_offset = offset;
4094 if (src_offset < length)
4095 break;
4096 offset -= length;
4097 }
4098
4099 st_bp->buffer_bytes = st_bp->read_pointer = total;
4100 for (dst_seg=dst_offset=0; total > 0; ) {
4101 struct page *dpage = st_bp->reserved_pages[dst_seg];
4102 struct page *spage = st_bp->reserved_pages[src_seg];
4103
4104 count = min(length - dst_offset, length - src_offset);
4105 memmove(page_address(dpage) + dst_offset,
4106 page_address(spage) + src_offset, count);
4107 src_offset += count;
4108 if (src_offset >= length) {
4109 src_seg++;
4110 src_offset = 0;
4111 }
4112 dst_offset += count;
4113 if (dst_offset >= length) {
4114 dst_seg++;
4115 dst_offset = 0;
4116 }
4117 total -= count;
4118 }
4119 }
4120
4121 /* Validate the options from command line or module parameters */
4122 static void validate_options(void)
4123 {
4124 if (buffer_kbs > 0)
4125 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4126 if (max_sg_segs >= ST_FIRST_SG)
4127 st_max_sg_segs = max_sg_segs;
4128 }
4129
4130 #ifndef MODULE
4131 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4132 */
4133 static int __init st_setup(char *str)
4134 {
4135 int i, len, ints[5];
4136 char *stp;
4137
4138 stp = get_options(str, ARRAY_SIZE(ints), ints);
4139
4140 if (ints[0] > 0) {
4141 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4142 if (parms[i].val)
4143 *parms[i].val = ints[i + 1];
4144 } else {
4145 while (stp != NULL) {
4146 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4147 len = strlen(parms[i].name);
4148 if (!strncmp(stp, parms[i].name, len) &&
4149 (*(stp + len) == ':' || *(stp + len) == '=')) {
4150 if (parms[i].val)
4151 *parms[i].val =
4152 simple_strtoul(stp + len + 1, NULL, 0);
4153 else
4154 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4155 parms[i].name);
4156 break;
4157 }
4158 }
4159 if (i >= ARRAY_SIZE(parms))
4160 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4161 stp);
4162 stp = strchr(stp, ',');
4163 if (stp)
4164 stp++;
4165 }
4166 }
4167
4168 validate_options();
4169
4170 return 1;
4171 }
4172
4173 __setup("st=", st_setup);
4174
4175 #endif
4176
4177 static const struct file_operations st_fops =
4178 {
4179 .owner = THIS_MODULE,
4180 .read = st_read,
4181 .write = st_write,
4182 .unlocked_ioctl = st_ioctl,
4183 #ifdef CONFIG_COMPAT
4184 .compat_ioctl = st_compat_ioctl,
4185 #endif
4186 .open = st_open,
4187 .flush = st_flush,
4188 .release = st_release,
4189 .llseek = noop_llseek,
4190 };
4191
4192 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4193 {
4194 int i, error;
4195 dev_t cdev_devno;
4196 struct cdev *cdev;
4197 struct device *dev;
4198 struct st_modedef *STm = &(tape->modes[mode]);
4199 char name[10];
4200 int dev_num = tape->index;
4201
4202 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4203
4204 cdev = cdev_alloc();
4205 if (!cdev) {
4206 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4207 error = -ENOMEM;
4208 goto out;
4209 }
4210 cdev->owner = THIS_MODULE;
4211 cdev->ops = &st_fops;
4212 STm->cdevs[rew] = cdev;
4213
4214 error = cdev_add(cdev, cdev_devno, 1);
4215 if (error) {
4216 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4217 rew ? "non" : "auto", mode);
4218 pr_err("st%d: Device not attached.\n", dev_num);
4219 goto out_free;
4220 }
4221
4222 i = mode << (4 - ST_NBR_MODE_BITS);
4223 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4224 tape->disk->disk_name, st_formats[i]);
4225
4226 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4227 cdev_devno, &tape->modes[mode], "%s", name);
4228 if (IS_ERR(dev)) {
4229 pr_err("st%d: device_create failed\n", dev_num);
4230 error = PTR_ERR(dev);
4231 goto out_free;
4232 }
4233
4234 STm->devs[rew] = dev;
4235
4236 return 0;
4237 out_free:
4238 cdev_del(STm->cdevs[rew]);
4239 out:
4240 STm->cdevs[rew] = NULL;
4241 STm->devs[rew] = NULL;
4242 return error;
4243 }
4244
4245 static int create_cdevs(struct scsi_tape *tape)
4246 {
4247 int mode, error;
4248 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4249 error = create_one_cdev(tape, mode, 0);
4250 if (error)
4251 return error;
4252 error = create_one_cdev(tape, mode, 1);
4253 if (error)
4254 return error;
4255 }
4256
4257 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4258 &tape->modes[0].devs[0]->kobj, "tape");
4259 }
4260
4261 static void remove_cdevs(struct scsi_tape *tape)
4262 {
4263 int mode, rew;
4264 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4265 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4266 struct st_modedef *STm = &(tape->modes[mode]);
4267 for (rew = 0; rew < 2; rew++) {
4268 if (STm->cdevs[rew])
4269 cdev_del(STm->cdevs[rew]);
4270 if (STm->devs[rew])
4271 device_unregister(STm->devs[rew]);
4272 }
4273 }
4274 }
4275
4276 static int st_probe(struct device *dev)
4277 {
4278 struct scsi_device *SDp = to_scsi_device(dev);
4279 struct gendisk *disk = NULL;
4280 struct scsi_tape *tpnt = NULL;
4281 struct st_modedef *STm;
4282 struct st_partstat *STps;
4283 struct st_buffer *buffer;
4284 int i, error;
4285 char *stp;
4286
4287 if (SDp->type != TYPE_TAPE)
4288 return -ENODEV;
4289 if ((stp = st_incompatible(SDp))) {
4290 sdev_printk(KERN_INFO, SDp,
4291 "OnStream tapes are no longer supported;\n");
4292 sdev_printk(KERN_INFO, SDp,
4293 "please mail to linux-scsi@vger.kernel.org.\n");
4294 return -ENODEV;
4295 }
4296
4297 scsi_autopm_get_device(SDp);
4298 i = queue_max_segments(SDp->request_queue);
4299 if (st_max_sg_segs < i)
4300 i = st_max_sg_segs;
4301 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4302 if (buffer == NULL) {
4303 sdev_printk(KERN_ERR, SDp,
4304 "st: Can't allocate new tape buffer. "
4305 "Device not attached.\n");
4306 goto out;
4307 }
4308
4309 disk = alloc_disk(1);
4310 if (!disk) {
4311 sdev_printk(KERN_ERR, SDp,
4312 "st: out of memory. Device not attached.\n");
4313 goto out_buffer_free;
4314 }
4315
4316 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4317 if (tpnt == NULL) {
4318 sdev_printk(KERN_ERR, SDp,
4319 "st: Can't allocate device descriptor.\n");
4320 goto out_put_disk;
4321 }
4322 kref_init(&tpnt->kref);
4323 tpnt->disk = disk;
4324 disk->private_data = &tpnt->driver;
4325 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4326 * take queue reference that release_disk() expects. */
4327 if (!blk_get_queue(SDp->request_queue))
4328 goto out_put_disk;
4329 disk->queue = SDp->request_queue;
4330 tpnt->driver = &st_template;
4331
4332 tpnt->device = SDp;
4333 if (SDp->scsi_level <= 2)
4334 tpnt->tape_type = MT_ISSCSI1;
4335 else
4336 tpnt->tape_type = MT_ISSCSI2;
4337
4338 tpnt->buffer = buffer;
4339 tpnt->buffer->last_SRpnt = NULL;
4340
4341 tpnt->inited = 0;
4342 tpnt->dirty = 0;
4343 tpnt->in_use = 0;
4344 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4345 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4346 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4347 tpnt->density = 0;
4348 tpnt->do_auto_lock = ST_AUTO_LOCK;
4349 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4350 tpnt->can_partitions = 0;
4351 tpnt->two_fm = ST_TWO_FM;
4352 tpnt->fast_mteom = ST_FAST_MTEOM;
4353 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4354 tpnt->sili = ST_SILI;
4355 tpnt->immediate = ST_NOWAIT;
4356 tpnt->immediate_filemark = 0;
4357 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4358 tpnt->partition = 0;
4359 tpnt->new_partition = 0;
4360 tpnt->nbr_partitions = 0;
4361 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4362 tpnt->long_timeout = ST_LONG_TIMEOUT;
4363 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4364
4365 for (i = 0; i < ST_NBR_MODES; i++) {
4366 STm = &(tpnt->modes[i]);
4367 STm->defined = 0;
4368 STm->sysv = ST_SYSV;
4369 STm->defaults_for_writes = 0;
4370 STm->do_async_writes = ST_ASYNC_WRITES;
4371 STm->do_buffer_writes = ST_BUFFER_WRITES;
4372 STm->do_read_ahead = ST_READ_AHEAD;
4373 STm->default_compression = ST_DONT_TOUCH;
4374 STm->default_blksize = (-1); /* No forced size */
4375 STm->default_density = (-1); /* No forced density */
4376 STm->tape = tpnt;
4377 }
4378
4379 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4380 STps = &(tpnt->ps[i]);
4381 STps->rw = ST_IDLE;
4382 STps->eof = ST_NOEOF;
4383 STps->at_sm = 0;
4384 STps->last_block_valid = 0;
4385 STps->drv_block = (-1);
4386 STps->drv_file = (-1);
4387 }
4388
4389 tpnt->current_mode = 0;
4390 tpnt->modes[0].defined = 1;
4391
4392 tpnt->density_changed = tpnt->compression_changed =
4393 tpnt->blksize_changed = 0;
4394 mutex_init(&tpnt->lock);
4395
4396 idr_preload(GFP_KERNEL);
4397 spin_lock(&st_index_lock);
4398 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4399 spin_unlock(&st_index_lock);
4400 idr_preload_end();
4401 if (error < 0) {
4402 pr_warn("st: idr allocation failed: %d\n", error);
4403 goto out_put_queue;
4404 }
4405 tpnt->index = error;
4406 sprintf(disk->disk_name, "st%d", tpnt->index);
4407 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4408 if (tpnt->stats == NULL) {
4409 sdev_printk(KERN_ERR, SDp,
4410 "st: Can't allocate statistics.\n");
4411 goto out_idr_remove;
4412 }
4413
4414 dev_set_drvdata(dev, tpnt);
4415
4416
4417 error = create_cdevs(tpnt);
4418 if (error)
4419 goto out_remove_devs;
4420 scsi_autopm_put_device(SDp);
4421
4422 sdev_printk(KERN_NOTICE, SDp,
4423 "Attached scsi tape %s\n", tape_name(tpnt));
4424 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4425 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4426 queue_dma_alignment(SDp->request_queue) + 1);
4427
4428 return 0;
4429
4430 out_remove_devs:
4431 remove_cdevs(tpnt);
4432 kfree(tpnt->stats);
4433 out_idr_remove:
4434 spin_lock(&st_index_lock);
4435 idr_remove(&st_index_idr, tpnt->index);
4436 spin_unlock(&st_index_lock);
4437 out_put_queue:
4438 blk_put_queue(disk->queue);
4439 out_put_disk:
4440 put_disk(disk);
4441 kfree(tpnt);
4442 out_buffer_free:
4443 kfree(buffer);
4444 out:
4445 scsi_autopm_put_device(SDp);
4446 return -ENODEV;
4447 };
4448
4449
4450 static int st_remove(struct device *dev)
4451 {
4452 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4453 int index = tpnt->index;
4454
4455 scsi_autopm_get_device(to_scsi_device(dev));
4456 remove_cdevs(tpnt);
4457
4458 mutex_lock(&st_ref_mutex);
4459 kref_put(&tpnt->kref, scsi_tape_release);
4460 mutex_unlock(&st_ref_mutex);
4461 spin_lock(&st_index_lock);
4462 idr_remove(&st_index_idr, index);
4463 spin_unlock(&st_index_lock);
4464 return 0;
4465 }
4466
4467 /**
4468 * scsi_tape_release - Called to free the Scsi_Tape structure
4469 * @kref: pointer to embedded kref
4470 *
4471 * st_ref_mutex must be held entering this routine. Because it is
4472 * called on last put, you should always use the scsi_tape_get()
4473 * scsi_tape_put() helpers which manipulate the semaphore directly
4474 * and never do a direct kref_put().
4475 **/
4476 static void scsi_tape_release(struct kref *kref)
4477 {
4478 struct scsi_tape *tpnt = to_scsi_tape(kref);
4479 struct gendisk *disk = tpnt->disk;
4480
4481 tpnt->device = NULL;
4482
4483 if (tpnt->buffer) {
4484 normalize_buffer(tpnt->buffer);
4485 kfree(tpnt->buffer->reserved_pages);
4486 kfree(tpnt->buffer);
4487 }
4488
4489 disk->private_data = NULL;
4490 put_disk(disk);
4491 kfree(tpnt->stats);
4492 kfree(tpnt);
4493 return;
4494 }
4495
4496 static struct class st_sysfs_class = {
4497 .name = "scsi_tape",
4498 .dev_groups = st_dev_groups,
4499 };
4500
4501 static int __init init_st(void)
4502 {
4503 int err;
4504
4505 validate_options();
4506
4507 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4508 verstr, st_fixed_buffer_size, st_max_sg_segs);
4509
4510 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4511 if (debugging) {
4512 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4513 debugging);
4514 }
4515
4516 err = class_register(&st_sysfs_class);
4517 if (err) {
4518 pr_err("Unable register sysfs class for SCSI tapes\n");
4519 return err;
4520 }
4521
4522 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4523 ST_MAX_TAPE_ENTRIES, "st");
4524 if (err) {
4525 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4526 SCSI_TAPE_MAJOR);
4527 goto err_class;
4528 }
4529
4530 err = scsi_register_driver(&st_template.gendrv);
4531 if (err)
4532 goto err_chrdev;
4533
4534 return 0;
4535
4536 err_chrdev:
4537 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4538 ST_MAX_TAPE_ENTRIES);
4539 err_class:
4540 class_unregister(&st_sysfs_class);
4541 return err;
4542 }
4543
4544 static void __exit exit_st(void)
4545 {
4546 scsi_unregister_driver(&st_template.gendrv);
4547 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4548 ST_MAX_TAPE_ENTRIES);
4549 class_unregister(&st_sysfs_class);
4550 idr_destroy(&st_index_idr);
4551 printk(KERN_INFO "st: Unloaded.\n");
4552 }
4553
4554 module_init(init_st);
4555 module_exit(exit_st);
4556
4557
4558 /* The sysfs driver interface. Read-only at the moment */
4559 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4560 {
4561 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4562 }
4563 static DRIVER_ATTR_RO(try_direct_io);
4564
4565 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4566 {
4567 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4568 }
4569 static DRIVER_ATTR_RO(fixed_buffer_size);
4570
4571 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4572 {
4573 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4574 }
4575 static DRIVER_ATTR_RO(max_sg_segs);
4576
4577 static ssize_t version_show(struct device_driver *ddd, char *buf)
4578 {
4579 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4580 }
4581 static DRIVER_ATTR_RO(version);
4582
4583 #if DEBUG
4584 static ssize_t debug_flag_store(struct device_driver *ddp,
4585 const char *buf, size_t count)
4586 {
4587 /* We only care what the first byte of the data is the rest is unused.
4588 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4589 * other values have -EINVAL returned if they are passed in.
4590 */
4591 if (count > 0) {
4592 if (buf[0] == '0') {
4593 debugging = NO_DEBUG;
4594 return count;
4595 } else if (buf[0] == '1') {
4596 debugging = 1;
4597 return count;
4598 }
4599 }
4600 return -EINVAL;
4601 }
4602
4603 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4604 {
4605 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4606 }
4607 static DRIVER_ATTR_RW(debug_flag);
4608 #endif
4609
4610 static struct attribute *st_drv_attrs[] = {
4611 &driver_attr_try_direct_io.attr,
4612 &driver_attr_fixed_buffer_size.attr,
4613 &driver_attr_max_sg_segs.attr,
4614 &driver_attr_version.attr,
4615 #if DEBUG
4616 &driver_attr_debug_flag.attr,
4617 #endif
4618 NULL,
4619 };
4620 ATTRIBUTE_GROUPS(st_drv);
4621
4622 /* The sysfs simple class interface */
4623 static ssize_t
4624 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4625 {
4626 struct st_modedef *STm = dev_get_drvdata(dev);
4627 ssize_t l = 0;
4628
4629 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4630 return l;
4631 }
4632 static DEVICE_ATTR_RO(defined);
4633
4634 static ssize_t
4635 default_blksize_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_blksize);
4642 return l;
4643 }
4644 static DEVICE_ATTR_RO(default_blksize);
4645
4646 static ssize_t
4647 default_density_show(struct device *dev, struct device_attribute *attr,
4648 char *buf)
4649 {
4650 struct st_modedef *STm = dev_get_drvdata(dev);
4651 ssize_t l = 0;
4652 char *fmt;
4653
4654 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4655 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4656 return l;
4657 }
4658 static DEVICE_ATTR_RO(default_density);
4659
4660 static ssize_t
4661 default_compression_show(struct device *dev, struct device_attribute *attr,
4662 char *buf)
4663 {
4664 struct st_modedef *STm = dev_get_drvdata(dev);
4665 ssize_t l = 0;
4666
4667 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4668 return l;
4669 }
4670 static DEVICE_ATTR_RO(default_compression);
4671
4672 static ssize_t
4673 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4674 {
4675 struct st_modedef *STm = dev_get_drvdata(dev);
4676 struct scsi_tape *STp = STm->tape;
4677 int options;
4678 ssize_t l = 0;
4679
4680 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4681 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4682 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4683 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4684 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4685 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4686 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4687 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4688 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4689 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4690 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4691 options |= STm->sysv ? MT_ST_SYSV : 0;
4692 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4693 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4694 options |= STp->sili ? MT_ST_SILI : 0;
4695
4696 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4697 return l;
4698 }
4699 static DEVICE_ATTR_RO(options);
4700
4701 /* Support for tape stats */
4702
4703 /**
4704 * read_cnt_show - return read count - count of reads made from tape drive
4705 * @dev: struct device
4706 * @attr: attribute structure
4707 * @buf: buffer to return formatted data in
4708 */
4709 static ssize_t read_cnt_show(struct device *dev,
4710 struct device_attribute *attr, char *buf)
4711 {
4712 struct st_modedef *STm = dev_get_drvdata(dev);
4713
4714 return sprintf(buf, "%lld",
4715 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4716 }
4717 static DEVICE_ATTR_RO(read_cnt);
4718
4719 /**
4720 * read_byte_cnt_show - return read byte count - tape drives
4721 * may use blocks less than 512 bytes this gives the raw byte count of
4722 * of data read from the tape drive.
4723 * @dev: struct device
4724 * @attr: attribute structure
4725 * @buf: buffer to return formatted data in
4726 */
4727 static ssize_t read_byte_cnt_show(struct device *dev,
4728 struct device_attribute *attr, char *buf)
4729 {
4730 struct st_modedef *STm = dev_get_drvdata(dev);
4731
4732 return sprintf(buf, "%lld",
4733 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4734 }
4735 static DEVICE_ATTR_RO(read_byte_cnt);
4736
4737 /**
4738 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4739 * @dev: struct device
4740 * @attr: attribute structure
4741 * @buf: buffer to return formatted data in
4742 */
4743 static ssize_t read_ns_show(struct device *dev,
4744 struct device_attribute *attr, char *buf)
4745 {
4746 struct st_modedef *STm = dev_get_drvdata(dev);
4747
4748 return sprintf(buf, "%lld",
4749 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4750 }
4751 static DEVICE_ATTR_RO(read_ns);
4752
4753 /**
4754 * write_cnt_show - write count - number of user calls
4755 * to write(2) that have written data to tape.
4756 * @dev: struct device
4757 * @attr: attribute structure
4758 * @buf: buffer to return formatted data in
4759 */
4760 static ssize_t write_cnt_show(struct device *dev,
4761 struct device_attribute *attr, char *buf)
4762 {
4763 struct st_modedef *STm = dev_get_drvdata(dev);
4764
4765 return sprintf(buf, "%lld",
4766 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4767 }
4768 static DEVICE_ATTR_RO(write_cnt);
4769
4770 /**
4771 * write_byte_cnt_show - write byte count - raw count of
4772 * bytes written to tape.
4773 * @dev: struct device
4774 * @attr: attribute structure
4775 * @buf: buffer to return formatted data in
4776 */
4777 static ssize_t write_byte_cnt_show(struct device *dev,
4778 struct device_attribute *attr, char *buf)
4779 {
4780 struct st_modedef *STm = dev_get_drvdata(dev);
4781
4782 return sprintf(buf, "%lld",
4783 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4784 }
4785 static DEVICE_ATTR_RO(write_byte_cnt);
4786
4787 /**
4788 * write_ns_show - write ns - number of nanoseconds waiting on write
4789 * requests to complete.
4790 * @dev: struct device
4791 * @attr: attribute structure
4792 * @buf: buffer to return formatted data in
4793 */
4794 static ssize_t write_ns_show(struct device *dev,
4795 struct device_attribute *attr, char *buf)
4796 {
4797 struct st_modedef *STm = dev_get_drvdata(dev);
4798
4799 return sprintf(buf, "%lld",
4800 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4801 }
4802 static DEVICE_ATTR_RO(write_ns);
4803
4804 /**
4805 * in_flight_show - number of I/Os currently in flight -
4806 * in most cases this will be either 0 or 1. It may be higher if someone
4807 * has also issued other SCSI commands such as via an ioctl.
4808 * @dev: struct device
4809 * @attr: attribute structure
4810 * @buf: buffer to return formatted data in
4811 */
4812 static ssize_t in_flight_show(struct device *dev,
4813 struct device_attribute *attr, char *buf)
4814 {
4815 struct st_modedef *STm = dev_get_drvdata(dev);
4816
4817 return sprintf(buf, "%lld",
4818 (long long)atomic64_read(&STm->tape->stats->in_flight));
4819 }
4820 static DEVICE_ATTR_RO(in_flight);
4821
4822 /**
4823 * io_ns_show - io wait ns - this is the number of ns spent
4824 * waiting on all I/O to complete. This includes tape movement commands
4825 * such as rewinding, seeking to end of file or tape, it also includes
4826 * read and write. To determine the time spent on tape movement
4827 * subtract the read and write ns from this value.
4828 * @dev: struct device
4829 * @attr: attribute structure
4830 * @buf: buffer to return formatted data in
4831 */
4832 static ssize_t io_ns_show(struct device *dev,
4833 struct device_attribute *attr, char *buf)
4834 {
4835 struct st_modedef *STm = dev_get_drvdata(dev);
4836
4837 return sprintf(buf, "%lld",
4838 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4839 }
4840 static DEVICE_ATTR_RO(io_ns);
4841
4842 /**
4843 * other_cnt_show - other io count - this is the number of
4844 * I/O requests other than read and write requests.
4845 * Typically these are tape movement requests but will include driver
4846 * tape movement. This includes only requests issued by the st driver.
4847 * @dev: struct device
4848 * @attr: attribute structure
4849 * @buf: buffer to return formatted data in
4850 */
4851 static ssize_t other_cnt_show(struct device *dev,
4852 struct device_attribute *attr, char *buf)
4853 {
4854 struct st_modedef *STm = dev_get_drvdata(dev);
4855
4856 return sprintf(buf, "%lld",
4857 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4858 }
4859 static DEVICE_ATTR_RO(other_cnt);
4860
4861 /**
4862 * resid_cnt_show - A count of the number of times we get a residual
4863 * count - this should indicate someone issuing reads larger than the
4864 * block size on tape.
4865 * @dev: struct device
4866 * @attr: attribute structure
4867 * @buf: buffer to return formatted data in
4868 */
4869 static ssize_t resid_cnt_show(struct device *dev,
4870 struct device_attribute *attr, char *buf)
4871 {
4872 struct st_modedef *STm = dev_get_drvdata(dev);
4873
4874 return sprintf(buf, "%lld",
4875 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4876 }
4877 static DEVICE_ATTR_RO(resid_cnt);
4878
4879 static struct attribute *st_dev_attrs[] = {
4880 &dev_attr_defined.attr,
4881 &dev_attr_default_blksize.attr,
4882 &dev_attr_default_density.attr,
4883 &dev_attr_default_compression.attr,
4884 &dev_attr_options.attr,
4885 NULL,
4886 };
4887
4888 static struct attribute *st_stats_attrs[] = {
4889 &dev_attr_read_cnt.attr,
4890 &dev_attr_read_byte_cnt.attr,
4891 &dev_attr_read_ns.attr,
4892 &dev_attr_write_cnt.attr,
4893 &dev_attr_write_byte_cnt.attr,
4894 &dev_attr_write_ns.attr,
4895 &dev_attr_in_flight.attr,
4896 &dev_attr_io_ns.attr,
4897 &dev_attr_other_cnt.attr,
4898 &dev_attr_resid_cnt.attr,
4899 NULL,
4900 };
4901
4902 static struct attribute_group stats_group = {
4903 .name = "stats",
4904 .attrs = st_stats_attrs,
4905 };
4906
4907 static struct attribute_group st_group = {
4908 .attrs = st_dev_attrs,
4909 };
4910
4911 static const struct attribute_group *st_dev_groups[] = {
4912 &st_group,
4913 &stats_group,
4914 NULL,
4915 };
4916
4917 /* The following functions may be useful for a larger audience. */
4918 static int sgl_map_user_pages(struct st_buffer *STbp,
4919 const unsigned int max_pages, unsigned long uaddr,
4920 size_t count, int rw)
4921 {
4922 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4923 unsigned long start = uaddr >> PAGE_SHIFT;
4924 const int nr_pages = end - start;
4925 int res, i, j;
4926 struct page **pages;
4927 struct rq_map_data *mdata = &STbp->map_data;
4928
4929 /* User attempted Overflow! */
4930 if ((uaddr + count) < uaddr)
4931 return -EINVAL;
4932
4933 /* Too big */
4934 if (nr_pages > max_pages)
4935 return -ENOMEM;
4936
4937 /* Hmm? */
4938 if (count == 0)
4939 return 0;
4940
4941 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4942 if (pages == NULL)
4943 return -ENOMEM;
4944
4945 /* Try to fault in all of the necessary pages */
4946 /* rw==READ means read from drive, write into memory area */
4947 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4948 pages);
4949
4950 /* Errors and no page mapped should return here */
4951 if (res < nr_pages)
4952 goto out_unmap;
4953
4954 for (i=0; i < nr_pages; i++) {
4955 /* FIXME: flush superflous for rw==READ,
4956 * probably wrong function for rw==WRITE
4957 */
4958 flush_dcache_page(pages[i]);
4959 }
4960
4961 mdata->offset = uaddr & ~PAGE_MASK;
4962 STbp->mapped_pages = pages;
4963
4964 return nr_pages;
4965 out_unmap:
4966 if (res > 0) {
4967 for (j=0; j < res; j++)
4968 put_page(pages[j]);
4969 res = 0;
4970 }
4971 kfree(pages);
4972 return res;
4973 }
4974
4975
4976 /* And unmap them... */
4977 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4978 const unsigned int nr_pages, int dirtied)
4979 {
4980 int i;
4981
4982 for (i=0; i < nr_pages; i++) {
4983 struct page *page = STbp->mapped_pages[i];
4984
4985 if (dirtied)
4986 SetPageDirty(page);
4987 /* FIXME: cache flush missing for rw==READ
4988 * FIXME: call the correct reference counting function
4989 */
4990 put_page(page);
4991 }
4992 kfree(STbp->mapped_pages);
4993 STbp->mapped_pages = NULL;
4994
4995 return 0;
4996 }
Linux with added FPC-III support