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mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm
[deliverable/linux.git] / drivers / scsi / st.c
1 /*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
12 Copyright 1992 - 2010 Kai Makisara
13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
20 static const char *verstr = "20101219";
21
22 #include <linux/module.h>
23
24 #include <linux/fs.h>
25 #include <linux/kernel.h>
26 #include <linux/sched.h>
27 #include <linux/mm.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/mtio.h>
33 #include <linux/cdrom.h>
34 #include <linux/ioctl.h>
35 #include <linux/fcntl.h>
36 #include <linux/spinlock.h>
37 #include <linux/blkdev.h>
38 #include <linux/moduleparam.h>
39 #include <linux/cdev.h>
40 #include <linux/idr.h>
41 #include <linux/delay.h>
42 #include <linux/mutex.h>
43
44 #include <asm/uaccess.h>
45 #include <asm/dma.h>
46
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_dbg.h>
49 #include <scsi/scsi_device.h>
50 #include <scsi/scsi_driver.h>
51 #include <scsi/scsi_eh.h>
52 #include <scsi/scsi_host.h>
53 #include <scsi/scsi_ioctl.h>
54 #include <scsi/sg.h>
55
56
57 /* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59 #define DEBUG 1
60 #define NO_DEBUG 0
61
62 #define ST_DEB_MSG KERN_NOTICE
63 #if DEBUG
64 /* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
67 #define DEB(a) a
68 #define DEBC(a) if (debugging) { a ; }
69 #else
70 #define DEB(a)
71 #define DEBC(a)
72 #endif
73
74 #define ST_KILOBYTE 1024
75
76 #include "st_options.h"
77 #include "st.h"
78
79 static int buffer_kbs;
80 static int max_sg_segs;
81 static int try_direct_io = TRY_DIRECT_IO;
82 static int try_rdio = 1;
83 static int try_wdio = 1;
84 static int debug_flag;
85
86 static struct class st_sysfs_class;
87 static const struct attribute_group *st_dev_groups[];
88 static const struct attribute_group *st_drv_groups[];
89
90 MODULE_AUTHOR("Kai Makisara");
91 MODULE_DESCRIPTION("SCSI tape (st) driver");
92 MODULE_LICENSE("GPL");
93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
95
96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100 module_param_named(buffer_kbs, buffer_kbs, int, 0);
101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102 module_param_named(max_sg_segs, max_sg_segs, int, 0);
103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104 module_param_named(try_direct_io, try_direct_io, int, 0);
105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106 module_param_named(debug_flag, debug_flag, int, 0);
107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
109
110 /* Extra parameters for testing */
111 module_param_named(try_rdio, try_rdio, int, 0);
112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113 module_param_named(try_wdio, try_wdio, int, 0);
114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116 #ifndef MODULE
117 static int write_threshold_kbs; /* retained for compatibility */
118 static struct st_dev_parm {
119 char *name;
120 int *val;
121 } parms[] __initdata = {
122 {
123 "buffer_kbs", &buffer_kbs
124 },
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
127 },
128 {
129 "max_sg_segs", NULL
130 },
131 {
132 "try_direct_io", &try_direct_io
133 },
134 {
135 "debug_flag", &debug_flag
136 }
137 };
138 #endif
139
140 /* Restrict the number of modes so that names for all are assigned */
141 #if ST_NBR_MODES > 16
142 #error "Maximum number of modes is 16"
143 #endif
144 /* Bit reversed order to get same names for same minors with all
145 mode counts */
146 static const char *st_formats[] = {
147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
149
150 /* The default definitions have been moved to st_options.h */
151
152 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
153
154 /* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
158 #endif
159
160 static int debugging = DEBUG;
161
162 #define MAX_RETRIES 0
163 #define MAX_WRITE_RETRIES 0
164 #define MAX_READY_RETRIES 0
165 #define NO_TAPE NOT_READY
166
167 #define ST_TIMEOUT (900 * HZ)
168 #define ST_LONG_TIMEOUT (14000 * HZ)
169
170 /* Remove mode bits and auto-rewind bit (7) */
171 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
174
175 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
178
179 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
180 24 bits) */
181 #define SET_DENS_AND_BLK 0x10001
182
183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184 static int st_max_sg_segs = ST_MAX_SG;
185
186 static int modes_defined;
187
188 static int enlarge_buffer(struct st_buffer *, int, int);
189 static void clear_buffer(struct st_buffer *);
190 static void normalize_buffer(struct st_buffer *);
191 static int append_to_buffer(const char __user *, struct st_buffer *, int);
192 static int from_buffer(struct st_buffer *, char __user *, int);
193 static void move_buffer_data(struct st_buffer *, int);
194
195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
196 unsigned long, size_t, int);
197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
198
199 static int st_probe(struct device *);
200 static int st_remove(struct device *);
201
202 static struct scsi_driver st_template = {
203 .gendrv = {
204 .name = "st",
205 .owner = THIS_MODULE,
206 .probe = st_probe,
207 .remove = st_remove,
208 .groups = st_drv_groups,
209 },
210 };
211
212 static int st_compression(struct scsi_tape *, int);
213
214 static int find_partition(struct scsi_tape *);
215 static int switch_partition(struct scsi_tape *);
216
217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
219 static void scsi_tape_release(struct kref *);
220
221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
223 static DEFINE_MUTEX(st_ref_mutex);
224 static DEFINE_SPINLOCK(st_index_lock);
225 static DEFINE_SPINLOCK(st_use_lock);
226 static DEFINE_IDR(st_index_idr);
227
228
229 \f
230 #include "osst_detect.h"
231 #ifndef SIGS_FROM_OSST
232 #define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
238 #endif
239
240 static struct scsi_tape *scsi_tape_get(int dev)
241 {
242 struct scsi_tape *STp = NULL;
243
244 mutex_lock(&st_ref_mutex);
245 spin_lock(&st_index_lock);
246
247 STp = idr_find(&st_index_idr, dev);
248 if (!STp) goto out;
249
250 kref_get(&STp->kref);
251
252 if (!STp->device)
253 goto out_put;
254
255 if (scsi_device_get(STp->device))
256 goto out_put;
257
258 goto out;
259
260 out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263 out:
264 spin_unlock(&st_index_lock);
265 mutex_unlock(&st_ref_mutex);
266 return STp;
267 }
268
269 static void scsi_tape_put(struct scsi_tape *STp)
270 {
271 struct scsi_device *sdev = STp->device;
272
273 mutex_lock(&st_ref_mutex);
274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
276 mutex_unlock(&st_ref_mutex);
277 }
278
279 struct st_reject_data {
280 char *vendor;
281 char *model;
282 char *rev;
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
284 };
285
286 static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
288 SIGS_FROM_OSST,
289 {NULL, }};
290
291 /* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293 static char * st_incompatible(struct scsi_device* SDp)
294 {
295 struct st_reject_data *rp;
296
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
301 if (rp->driver_hint)
302 return rp->driver_hint;
303 else
304 return "unknown";
305 }
306 return NULL;
307 }
308 \f
309
310 static inline char *tape_name(struct scsi_tape *tape)
311 {
312 return tape->disk->disk_name;
313 }
314
315 #define st_printk(prefix, t, fmt, a...) \
316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
317 #ifdef DEBUG
318 #define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
320 #else
321 #define DEBC_printk(t, fmt, a...)
322 #endif
323
324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
325 {
326 const u8 *ucp;
327 const u8 *sense = SRpnt->sense;
328
329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
331 s->flags = 0;
332
333 if (s->have_sense) {
334 s->deferred = 0;
335 s->remainder_valid =
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
338 case 0x71:
339 s->deferred = 1;
340 case 0x70:
341 s->fixed_format = 1;
342 s->flags = sense[2] & 0xe0;
343 break;
344 case 0x73:
345 s->deferred = 1;
346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353 }
354
355
356 /* Convert the result to success code */
357 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
358 {
359 int result = SRpnt->result;
360 u8 scode;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
369 st_analyze_sense(SRpnt, cmdstatp);
370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
382 if (cmdstatp->have_sense)
383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
399
400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422 #if ST_RECOVERED_WRITE_FATAL
423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
425 #endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
430 DEB(
431 if (debugging) {
432 if (SRpnt->cmd[0] == READ_6)
433 stp = "read";
434 else if (SRpnt->cmd[0] == WRITE_6)
435 stp = "write";
436 else
437 stp = "ioctl";
438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447 }
448
449 static struct st_request *st_allocate_request(struct scsi_tape *stp)
450 {
451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
466 }
467
468 static void st_release_request(struct st_request *streq)
469 {
470 kfree(streq);
471 }
472
473 static void st_do_stats(struct scsi_tape *STp, struct request *req)
474 {
475 ktime_t now;
476
477 now = ktime_get();
478 if (req->cmd[0] == WRITE_6) {
479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
483 if (req->errors) {
484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
492 } else if (req->cmd[0] == READ_6) {
493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
497 if (req->errors) {
498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512 }
513
514 static void st_scsi_execute_end(struct request *req, int uptodate)
515 {
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_tape *STp = SRpnt->stp;
518 struct bio *tmp;
519
520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
521 STp->buffer->cmdstat.residual = req->resid_len;
522
523 st_do_stats(STp, req);
524
525 tmp = SRpnt->bio;
526 if (SRpnt->waiting)
527 complete(SRpnt->waiting);
528
529 blk_rq_unmap_user(tmp);
530 __blk_put_request(req->q, req);
531 }
532
533 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
534 int data_direction, void *buffer, unsigned bufflen,
535 int timeout, int retries)
536 {
537 struct request *req;
538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
539 int err = 0;
540 int write = (data_direction == DMA_TO_DEVICE);
541 struct scsi_tape *STp = SRpnt->stp;
542
543 req = blk_get_request(SRpnt->stp->device->request_queue, write,
544 GFP_KERNEL);
545 if (IS_ERR(req))
546 return DRIVER_ERROR << 24;
547
548 blk_rq_set_block_pc(req);
549 req->cmd_flags |= REQ_QUIET;
550
551 mdata->null_mapped = 1;
552
553 if (bufflen) {
554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
555 GFP_KERNEL);
556 if (err) {
557 blk_put_request(req);
558 return DRIVER_ERROR << 24;
559 }
560 }
561
562 atomic64_inc(&STp->stats->in_flight);
563 if (cmd[0] == WRITE_6) {
564 atomic_set(&STp->stats->last_write_size, bufflen);
565 STp->stats->write_time = ktime_get();
566 } else if (cmd[0] == READ_6) {
567 atomic_set(&STp->stats->last_read_size, bufflen);
568 STp->stats->read_time = ktime_get();
569 } else {
570 STp->stats->other_time = ktime_get();
571 }
572
573 SRpnt->bio = req->bio;
574 req->cmd_len = COMMAND_SIZE(cmd[0]);
575 memset(req->cmd, 0, BLK_MAX_CDB);
576 memcpy(req->cmd, cmd, req->cmd_len);
577 req->sense = SRpnt->sense;
578 req->sense_len = 0;
579 req->timeout = timeout;
580 req->retries = retries;
581 req->end_io_data = SRpnt;
582
583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
584 return 0;
585 }
586
587 /* Do the scsi command. Waits until command performed if do_wait is true.
588 Otherwise write_behind_check() is used to check that the command
589 has finished. */
590 static struct st_request *
591 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
592 int bytes, int direction, int timeout, int retries, int do_wait)
593 {
594 struct completion *waiting;
595 struct rq_map_data *mdata = &STp->buffer->map_data;
596 int ret;
597
598 /* if async, make sure there's no command outstanding */
599 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
600 st_printk(KERN_ERR, STp,
601 "Async command already active.\n");
602 if (signal_pending(current))
603 (STp->buffer)->syscall_result = (-EINTR);
604 else
605 (STp->buffer)->syscall_result = (-EBUSY);
606 return NULL;
607 }
608
609 if (!SRpnt) {
610 SRpnt = st_allocate_request(STp);
611 if (!SRpnt)
612 return NULL;
613 }
614
615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
616 which IO is outstanding. It's nulled out when the IO completes. */
617 if (!do_wait)
618 (STp->buffer)->last_SRpnt = SRpnt;
619
620 waiting = &STp->wait;
621 init_completion(waiting);
622 SRpnt->waiting = waiting;
623
624 if (STp->buffer->do_dio) {
625 mdata->page_order = 0;
626 mdata->nr_entries = STp->buffer->sg_segs;
627 mdata->pages = STp->buffer->mapped_pages;
628 } else {
629 mdata->page_order = STp->buffer->reserved_page_order;
630 mdata->nr_entries =
631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
632 mdata->pages = STp->buffer->reserved_pages;
633 mdata->offset = 0;
634 }
635
636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
637 STp->buffer->cmdstat.have_sense = 0;
638 STp->buffer->syscall_result = 0;
639
640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
641 retries);
642 if (ret) {
643 /* could not allocate the buffer or request was too large */
644 (STp->buffer)->syscall_result = (-EBUSY);
645 (STp->buffer)->last_SRpnt = NULL;
646 } else if (do_wait) {
647 wait_for_completion(waiting);
648 SRpnt->waiting = NULL;
649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
650 }
651
652 return SRpnt;
653 }
654
655
656 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
657 write has been correct but EOM early warning reached, -EIO if write ended in
658 error or zero if write successful. Asynchronous writes are used only in
659 variable block mode. */
660 static int write_behind_check(struct scsi_tape * STp)
661 {
662 int retval = 0;
663 struct st_buffer *STbuffer;
664 struct st_partstat *STps;
665 struct st_cmdstatus *cmdstatp;
666 struct st_request *SRpnt;
667
668 STbuffer = STp->buffer;
669 if (!STbuffer->writing)
670 return 0;
671
672 DEB(
673 if (STp->write_pending)
674 STp->nbr_waits++;
675 else
676 STp->nbr_finished++;
677 ) /* end DEB */
678
679 wait_for_completion(&(STp->wait));
680 SRpnt = STbuffer->last_SRpnt;
681 STbuffer->last_SRpnt = NULL;
682 SRpnt->waiting = NULL;
683
684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
685 st_release_request(SRpnt);
686
687 STbuffer->buffer_bytes -= STbuffer->writing;
688 STps = &(STp->ps[STp->partition]);
689 if (STps->drv_block >= 0) {
690 if (STp->block_size == 0)
691 STps->drv_block++;
692 else
693 STps->drv_block += STbuffer->writing / STp->block_size;
694 }
695
696 cmdstatp = &STbuffer->cmdstat;
697 if (STbuffer->syscall_result) {
698 retval = -EIO;
699 if (cmdstatp->have_sense && !cmdstatp->deferred &&
700 (cmdstatp->flags & SENSE_EOM) &&
701 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
703 /* EOM at write-behind, has all data been written? */
704 if (!cmdstatp->remainder_valid ||
705 cmdstatp->uremainder64 == 0)
706 retval = -ENOSPC;
707 }
708 if (retval == -EIO)
709 STps->drv_block = -1;
710 }
711 STbuffer->writing = 0;
712
713 DEB(if (debugging && retval)
714 st_printk(ST_DEB_MSG, STp,
715 "Async write error %x, return value %d.\n",
716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
717
718 return retval;
719 }
720
721
722 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
723 it messes up the block number). */
724 static int cross_eof(struct scsi_tape * STp, int forward)
725 {
726 struct st_request *SRpnt;
727 unsigned char cmd[MAX_COMMAND_SIZE];
728
729 cmd[0] = SPACE;
730 cmd[1] = 0x01; /* Space FileMarks */
731 if (forward) {
732 cmd[2] = cmd[3] = 0;
733 cmd[4] = 1;
734 } else
735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
736 cmd[5] = 0;
737
738 DEBC_printk(STp, "Stepping over filemark %s.\n",
739 forward ? "forward" : "backward");
740
741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
742 STp->device->request_queue->rq_timeout,
743 MAX_RETRIES, 1);
744 if (!SRpnt)
745 return (STp->buffer)->syscall_result;
746
747 st_release_request(SRpnt);
748 SRpnt = NULL;
749
750 if ((STp->buffer)->cmdstat.midlevel_result != 0)
751 st_printk(KERN_ERR, STp,
752 "Stepping over filemark %s failed.\n",
753 forward ? "forward" : "backward");
754
755 return (STp->buffer)->syscall_result;
756 }
757
758
759 /* Flush the write buffer (never need to write if variable blocksize). */
760 static int st_flush_write_buffer(struct scsi_tape * STp)
761 {
762 int transfer, blks;
763 int result;
764 unsigned char cmd[MAX_COMMAND_SIZE];
765 struct st_request *SRpnt;
766 struct st_partstat *STps;
767
768 result = write_behind_check(STp);
769 if (result)
770 return result;
771
772 result = 0;
773 if (STp->dirty == 1) {
774
775 transfer = STp->buffer->buffer_bytes;
776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
777
778 memset(cmd, 0, MAX_COMMAND_SIZE);
779 cmd[0] = WRITE_6;
780 cmd[1] = 1;
781 blks = transfer / STp->block_size;
782 cmd[2] = blks >> 16;
783 cmd[3] = blks >> 8;
784 cmd[4] = blks;
785
786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
787 STp->device->request_queue->rq_timeout,
788 MAX_WRITE_RETRIES, 1);
789 if (!SRpnt)
790 return (STp->buffer)->syscall_result;
791
792 STps = &(STp->ps[STp->partition]);
793 if ((STp->buffer)->syscall_result != 0) {
794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
795
796 if (cmdstatp->have_sense && !cmdstatp->deferred &&
797 (cmdstatp->flags & SENSE_EOM) &&
798 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
800 (!cmdstatp->remainder_valid ||
801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
802 STp->dirty = 0;
803 (STp->buffer)->buffer_bytes = 0;
804 if (STps->drv_block >= 0)
805 STps->drv_block += blks;
806 result = (-ENOSPC);
807 } else {
808 st_printk(KERN_ERR, STp, "Error on flush.\n");
809 STps->drv_block = (-1);
810 result = (-EIO);
811 }
812 } else {
813 if (STps->drv_block >= 0)
814 STps->drv_block += blks;
815 STp->dirty = 0;
816 (STp->buffer)->buffer_bytes = 0;
817 }
818 st_release_request(SRpnt);
819 SRpnt = NULL;
820 }
821 return result;
822 }
823
824
825 /* Flush the tape buffer. The tape will be positioned correctly unless
826 seek_next is true. */
827 static int flush_buffer(struct scsi_tape *STp, int seek_next)
828 {
829 int backspace, result;
830 struct st_buffer *STbuffer;
831 struct st_partstat *STps;
832
833 STbuffer = STp->buffer;
834
835 /*
836 * If there was a bus reset, block further access
837 * to this device.
838 */
839 if (STp->pos_unknown)
840 return (-EIO);
841
842 if (STp->ready != ST_READY)
843 return 0;
844 STps = &(STp->ps[STp->partition]);
845 if (STps->rw == ST_WRITING) /* Writing */
846 return st_flush_write_buffer(STp);
847
848 if (STp->block_size == 0)
849 return 0;
850
851 backspace = ((STp->buffer)->buffer_bytes +
852 (STp->buffer)->read_pointer) / STp->block_size -
853 ((STp->buffer)->read_pointer + STp->block_size - 1) /
854 STp->block_size;
855 (STp->buffer)->buffer_bytes = 0;
856 (STp->buffer)->read_pointer = 0;
857 result = 0;
858 if (!seek_next) {
859 if (STps->eof == ST_FM_HIT) {
860 result = cross_eof(STp, 0); /* Back over the EOF hit */
861 if (!result)
862 STps->eof = ST_NOEOF;
863 else {
864 if (STps->drv_file >= 0)
865 STps->drv_file++;
866 STps->drv_block = 0;
867 }
868 }
869 if (!result && backspace > 0)
870 result = st_int_ioctl(STp, MTBSR, backspace);
871 } else if (STps->eof == ST_FM_HIT) {
872 if (STps->drv_file >= 0)
873 STps->drv_file++;
874 STps->drv_block = 0;
875 STps->eof = ST_NOEOF;
876 }
877 return result;
878
879 }
880 \f
881 /* Set the mode parameters */
882 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
883 {
884 int set_it = 0;
885 unsigned long arg;
886
887 if (!STp->density_changed &&
888 STm->default_density >= 0 &&
889 STm->default_density != STp->density) {
890 arg = STm->default_density;
891 set_it = 1;
892 } else
893 arg = STp->density;
894 arg <<= MT_ST_DENSITY_SHIFT;
895 if (!STp->blksize_changed &&
896 STm->default_blksize >= 0 &&
897 STm->default_blksize != STp->block_size) {
898 arg |= STm->default_blksize;
899 set_it = 1;
900 } else
901 arg |= STp->block_size;
902 if (set_it &&
903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
904 st_printk(KERN_WARNING, STp,
905 "Can't set default block size to %d bytes "
906 "and density %x.\n",
907 STm->default_blksize, STm->default_density);
908 if (modes_defined)
909 return (-EINVAL);
910 }
911 return 0;
912 }
913
914
915 /* Lock or unlock the drive door. Don't use when st_request allocated. */
916 static int do_door_lock(struct scsi_tape * STp, int do_lock)
917 {
918 int retval;
919
920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
921
922 retval = scsi_set_medium_removal(STp->device,
923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
924 if (!retval)
925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
926 else
927 STp->door_locked = ST_LOCK_FAILS;
928 return retval;
929 }
930
931
932 /* Set the internal state after reset */
933 static void reset_state(struct scsi_tape *STp)
934 {
935 int i;
936 struct st_partstat *STps;
937
938 STp->pos_unknown = 0;
939 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
940 STps = &(STp->ps[i]);
941 STps->rw = ST_IDLE;
942 STps->eof = ST_NOEOF;
943 STps->at_sm = 0;
944 STps->last_block_valid = 0;
945 STps->drv_block = -1;
946 STps->drv_file = -1;
947 }
948 if (STp->can_partitions) {
949 STp->partition = find_partition(STp);
950 if (STp->partition < 0)
951 STp->partition = 0;
952 STp->new_partition = STp->partition;
953 }
954 }
955 \f
956 /* Test if the drive is ready. Returns either one of the codes below or a negative system
957 error code. */
958 #define CHKRES_READY 0
959 #define CHKRES_NEW_SESSION 1
960 #define CHKRES_NOT_READY 2
961 #define CHKRES_NO_TAPE 3
962
963 #define MAX_ATTENTIONS 10
964
965 static int test_ready(struct scsi_tape *STp, int do_wait)
966 {
967 int attentions, waits, max_wait, scode;
968 int retval = CHKRES_READY, new_session = 0;
969 unsigned char cmd[MAX_COMMAND_SIZE];
970 struct st_request *SRpnt = NULL;
971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
972
973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
974
975 for (attentions=waits=0; ; ) {
976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
977 cmd[0] = TEST_UNIT_READY;
978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
979 STp->long_timeout, MAX_READY_RETRIES, 1);
980
981 if (!SRpnt) {
982 retval = (STp->buffer)->syscall_result;
983 break;
984 }
985
986 if (cmdstatp->have_sense) {
987
988 scode = cmdstatp->sense_hdr.sense_key;
989
990 if (scode == UNIT_ATTENTION) { /* New media? */
991 new_session = 1;
992 if (attentions < MAX_ATTENTIONS) {
993 attentions++;
994 continue;
995 }
996 else {
997 retval = (-EIO);
998 break;
999 }
1000 }
1001
1002 if (scode == NOT_READY) {
1003 if (waits < max_wait) {
1004 if (msleep_interruptible(1000)) {
1005 retval = (-EINTR);
1006 break;
1007 }
1008 waits++;
1009 continue;
1010 }
1011 else {
1012 if ((STp->device)->scsi_level >= SCSI_2 &&
1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1014 retval = CHKRES_NO_TAPE;
1015 else
1016 retval = CHKRES_NOT_READY;
1017 break;
1018 }
1019 }
1020 }
1021
1022 retval = (STp->buffer)->syscall_result;
1023 if (!retval)
1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1025 break;
1026 }
1027
1028 if (SRpnt != NULL)
1029 st_release_request(SRpnt);
1030 return retval;
1031 }
1032
1033
1034 /* See if the drive is ready and gather information about the tape. Return values:
1035 < 0 negative error code from errno.h
1036 0 drive ready
1037 1 drive not ready (possibly no tape)
1038 */
1039 static int check_tape(struct scsi_tape *STp, struct file *filp)
1040 {
1041 int i, retval, new_session = 0, do_wait;
1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1043 unsigned short st_flags = filp->f_flags;
1044 struct st_request *SRpnt = NULL;
1045 struct st_modedef *STm;
1046 struct st_partstat *STps;
1047 struct inode *inode = file_inode(filp);
1048 int mode = TAPE_MODE(inode);
1049
1050 STp->ready = ST_READY;
1051
1052 if (mode != STp->current_mode) {
1053 DEBC_printk(STp, "Mode change from %d to %d.\n",
1054 STp->current_mode, mode);
1055 new_session = 1;
1056 STp->current_mode = mode;
1057 }
1058 STm = &(STp->modes[STp->current_mode]);
1059
1060 saved_cleaning = STp->cleaning_req;
1061 STp->cleaning_req = 0;
1062
1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1064 retval = test_ready(STp, do_wait);
1065
1066 if (retval < 0)
1067 goto err_out;
1068
1069 if (retval == CHKRES_NEW_SESSION) {
1070 STp->pos_unknown = 0;
1071 STp->partition = STp->new_partition = 0;
1072 if (STp->can_partitions)
1073 STp->nbr_partitions = 1; /* This guess will be updated later
1074 if necessary */
1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1076 STps = &(STp->ps[i]);
1077 STps->rw = ST_IDLE;
1078 STps->eof = ST_NOEOF;
1079 STps->at_sm = 0;
1080 STps->last_block_valid = 0;
1081 STps->drv_block = 0;
1082 STps->drv_file = 0;
1083 }
1084 new_session = 1;
1085 }
1086 else {
1087 STp->cleaning_req |= saved_cleaning;
1088
1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1090 if (retval == CHKRES_NO_TAPE)
1091 STp->ready = ST_NO_TAPE;
1092 else
1093 STp->ready = ST_NOT_READY;
1094
1095 STp->density = 0; /* Clear the erroneous "residue" */
1096 STp->write_prot = 0;
1097 STp->block_size = 0;
1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1099 STp->partition = STp->new_partition = 0;
1100 STp->door_locked = ST_UNLOCKED;
1101 return CHKRES_NOT_READY;
1102 }
1103 }
1104
1105 if (STp->omit_blklims)
1106 STp->min_block = STp->max_block = (-1);
1107 else {
1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1109 cmd[0] = READ_BLOCK_LIMITS;
1110
1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1112 STp->device->request_queue->rq_timeout,
1113 MAX_READY_RETRIES, 1);
1114 if (!SRpnt) {
1115 retval = (STp->buffer)->syscall_result;
1116 goto err_out;
1117 }
1118
1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1123 (STp->buffer)->b_data[5];
1124 if ( DEB( debugging || ) !STp->inited)
1125 st_printk(KERN_INFO, STp,
1126 "Block limits %d - %d bytes.\n",
1127 STp->min_block, STp->max_block);
1128 } else {
1129 STp->min_block = STp->max_block = (-1);
1130 DEBC_printk(STp, "Can't read block limits.\n");
1131 }
1132 }
1133
1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1135 cmd[0] = MODE_SENSE;
1136 cmd[4] = 12;
1137
1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1139 STp->device->request_queue->rq_timeout,
1140 MAX_READY_RETRIES, 1);
1141 if (!SRpnt) {
1142 retval = (STp->buffer)->syscall_result;
1143 goto err_out;
1144 }
1145
1146 if ((STp->buffer)->syscall_result != 0) {
1147 DEBC_printk(STp, "No Mode Sense.\n");
1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1150 STp->drv_write_prot = 0;
1151 } else {
1152 DEBC_printk(STp,"Mode sense. Length %d, "
1153 "medium %x, WBS %x, BLL %d\n",
1154 (STp->buffer)->b_data[0],
1155 (STp->buffer)->b_data[1],
1156 (STp->buffer)->b_data[2],
1157 (STp->buffer)->b_data[3]);
1158
1159 if ((STp->buffer)->b_data[3] >= 8) {
1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1161 STp->density = (STp->buffer)->b_data[4];
1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1164 DEBC_printk(STp, "Density %x, tape length: %x, "
1165 "drv buffer: %d\n",
1166 STp->density,
1167 (STp->buffer)->b_data[5] * 65536 +
1168 (STp->buffer)->b_data[6] * 256 +
1169 (STp->buffer)->b_data[7],
1170 STp->drv_buffer);
1171 }
1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1173 if (!STp->drv_buffer && STp->immediate_filemark) {
1174 st_printk(KERN_WARNING, STp,
1175 "non-buffered tape: disabling "
1176 "writing immediate filemarks\n");
1177 STp->immediate_filemark = 0;
1178 }
1179 }
1180 st_release_request(SRpnt);
1181 SRpnt = NULL;
1182 STp->inited = 1;
1183
1184 if (STp->block_size > 0)
1185 (STp->buffer)->buffer_blocks =
1186 (STp->buffer)->buffer_size / STp->block_size;
1187 else
1188 (STp->buffer)->buffer_blocks = 1;
1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1190
1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1192 STp->block_size, (STp->buffer)->buffer_size,
1193 (STp->buffer)->buffer_blocks);
1194
1195 if (STp->drv_write_prot) {
1196 STp->write_prot = 1;
1197
1198 DEBC_printk(STp, "Write protected\n");
1199
1200 if (do_wait &&
1201 ((st_flags & O_ACCMODE) == O_WRONLY ||
1202 (st_flags & O_ACCMODE) == O_RDWR)) {
1203 retval = (-EROFS);
1204 goto err_out;
1205 }
1206 }
1207
1208 if (STp->can_partitions && STp->nbr_partitions < 1) {
1209 /* This code is reached when the device is opened for the first time
1210 after the driver has been initialized with tape in the drive and the
1211 partition support has been enabled. */
1212 DEBC_printk(STp, "Updating partition number in status.\n");
1213 if ((STp->partition = find_partition(STp)) < 0) {
1214 retval = STp->partition;
1215 goto err_out;
1216 }
1217 STp->new_partition = STp->partition;
1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1219 }
1220
1221 if (new_session) { /* Change the drive parameters for the new mode */
1222 STp->density_changed = STp->blksize_changed = 0;
1223 STp->compression_changed = 0;
1224 if (!(STm->defaults_for_writes) &&
1225 (retval = set_mode_densblk(STp, STm)) < 0)
1226 goto err_out;
1227
1228 if (STp->default_drvbuffer != 0xff) {
1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1230 st_printk(KERN_WARNING, STp,
1231 "Can't set default drive "
1232 "buffering to %d.\n",
1233 STp->default_drvbuffer);
1234 }
1235 }
1236
1237 return CHKRES_READY;
1238
1239 err_out:
1240 return retval;
1241 }
1242
1243
1244 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1245 module count. */
1246 static int st_open(struct inode *inode, struct file *filp)
1247 {
1248 int i, retval = (-EIO);
1249 int resumed = 0;
1250 struct scsi_tape *STp;
1251 struct st_partstat *STps;
1252 int dev = TAPE_NR(inode);
1253
1254 /*
1255 * We really want to do nonseekable_open(inode, filp); here, but some
1256 * versions of tar incorrectly call lseek on tapes and bail out if that
1257 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1258 */
1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1260
1261 if (!(STp = scsi_tape_get(dev))) {
1262 return -ENXIO;
1263 }
1264
1265 filp->private_data = STp;
1266
1267 spin_lock(&st_use_lock);
1268 if (STp->in_use) {
1269 spin_unlock(&st_use_lock);
1270 scsi_tape_put(STp);
1271 DEBC_printk(STp, "Device already in use.\n");
1272 return (-EBUSY);
1273 }
1274
1275 STp->in_use = 1;
1276 spin_unlock(&st_use_lock);
1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1278
1279 if (scsi_autopm_get_device(STp->device) < 0) {
1280 retval = -EIO;
1281 goto err_out;
1282 }
1283 resumed = 1;
1284 if (!scsi_block_when_processing_errors(STp->device)) {
1285 retval = (-ENXIO);
1286 goto err_out;
1287 }
1288
1289 /* See that we have at least a one page buffer available */
1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1291 st_printk(KERN_WARNING, STp,
1292 "Can't allocate one page tape buffer.\n");
1293 retval = (-EOVERFLOW);
1294 goto err_out;
1295 }
1296
1297 (STp->buffer)->cleared = 0;
1298 (STp->buffer)->writing = 0;
1299 (STp->buffer)->syscall_result = 0;
1300
1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1302
1303 STp->dirty = 0;
1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1305 STps = &(STp->ps[i]);
1306 STps->rw = ST_IDLE;
1307 }
1308 STp->try_dio_now = STp->try_dio;
1309 STp->recover_count = 0;
1310 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1312
1313 retval = check_tape(STp, filp);
1314 if (retval < 0)
1315 goto err_out;
1316 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1317 retval != CHKRES_READY) {
1318 if (STp->ready == NO_TAPE)
1319 retval = (-ENOMEDIUM);
1320 else
1321 retval = (-EIO);
1322 goto err_out;
1323 }
1324 return 0;
1325
1326 err_out:
1327 normalize_buffer(STp->buffer);
1328 spin_lock(&st_use_lock);
1329 STp->in_use = 0;
1330 spin_unlock(&st_use_lock);
1331 if (resumed)
1332 scsi_autopm_put_device(STp->device);
1333 scsi_tape_put(STp);
1334 return retval;
1335
1336 }
1337 \f
1338
1339 /* Flush the tape buffer before close */
1340 static int st_flush(struct file *filp, fl_owner_t id)
1341 {
1342 int result = 0, result2;
1343 unsigned char cmd[MAX_COMMAND_SIZE];
1344 struct st_request *SRpnt;
1345 struct scsi_tape *STp = filp->private_data;
1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1347 struct st_partstat *STps = &(STp->ps[STp->partition]);
1348
1349 if (file_count(filp) > 1)
1350 return 0;
1351
1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1353 result = st_flush_write_buffer(STp);
1354 if (result != 0 && result != (-ENOSPC))
1355 goto out;
1356 }
1357
1358 if (STp->can_partitions &&
1359 (result2 = switch_partition(STp)) < 0) {
1360 DEBC_printk(STp, "switch_partition at close failed.\n");
1361 if (result == 0)
1362 result = result2;
1363 goto out;
1364 }
1365
1366 DEBC( if (STp->nbr_requests)
1367 st_printk(KERN_DEBUG, STp,
1368 "Number of r/w requests %d, dio used in %d, "
1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1370 STp->nbr_pages));
1371
1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1374
1375 #if DEBUG
1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1377 STp->nbr_waits, STp->nbr_finished);
1378 #endif
1379 memset(cmd, 0, MAX_COMMAND_SIZE);
1380 cmd[0] = WRITE_FILEMARKS;
1381 if (STp->immediate_filemark)
1382 cmd[1] = 1;
1383 cmd[4] = 1 + STp->two_fm;
1384
1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1386 STp->device->request_queue->rq_timeout,
1387 MAX_WRITE_RETRIES, 1);
1388 if (!SRpnt) {
1389 result = (STp->buffer)->syscall_result;
1390 goto out;
1391 }
1392
1393 if (STp->buffer->syscall_result == 0 ||
1394 (cmdstatp->have_sense && !cmdstatp->deferred &&
1395 (cmdstatp->flags & SENSE_EOM) &&
1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1399 /* Write successful at EOM */
1400 st_release_request(SRpnt);
1401 SRpnt = NULL;
1402 if (STps->drv_file >= 0)
1403 STps->drv_file++;
1404 STps->drv_block = 0;
1405 if (STp->two_fm)
1406 cross_eof(STp, 0);
1407 STps->eof = ST_FM;
1408 }
1409 else { /* Write error */
1410 st_release_request(SRpnt);
1411 SRpnt = NULL;
1412 st_printk(KERN_ERR, STp,
1413 "Error on write filemark.\n");
1414 if (result == 0)
1415 result = (-EIO);
1416 }
1417
1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1419 } else if (!STp->rew_at_close) {
1420 STps = &(STp->ps[STp->partition]);
1421 if (!STm->sysv || STps->rw != ST_READING) {
1422 if (STp->can_bsr)
1423 result = flush_buffer(STp, 0);
1424 else if (STps->eof == ST_FM_HIT) {
1425 result = cross_eof(STp, 0);
1426 if (result) {
1427 if (STps->drv_file >= 0)
1428 STps->drv_file++;
1429 STps->drv_block = 0;
1430 STps->eof = ST_FM;
1431 } else
1432 STps->eof = ST_NOEOF;
1433 }
1434 } else if ((STps->eof == ST_NOEOF &&
1435 !(result = cross_eof(STp, 1))) ||
1436 STps->eof == ST_FM_HIT) {
1437 if (STps->drv_file >= 0)
1438 STps->drv_file++;
1439 STps->drv_block = 0;
1440 STps->eof = ST_FM;
1441 }
1442 }
1443
1444 out:
1445 if (STp->rew_at_close) {
1446 result2 = st_int_ioctl(STp, MTREW, 1);
1447 if (result == 0)
1448 result = result2;
1449 }
1450 return result;
1451 }
1452
1453
1454 /* Close the device and release it. BKL is not needed: this is the only thread
1455 accessing this tape. */
1456 static int st_release(struct inode *inode, struct file *filp)
1457 {
1458 int result = 0;
1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
1465 spin_lock(&st_use_lock);
1466 STp->in_use = 0;
1467 spin_unlock(&st_use_lock);
1468 scsi_autopm_put_device(STp->device);
1469 scsi_tape_put(STp);
1470
1471 return result;
1472 }
1473 \f
1474 /* The checks common to both reading and writing */
1475 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476 {
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
1516 DEB(
1517 if (!STp->in_use) {
1518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
1520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540 }
1541
1542
1543 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545 {
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
1550 i = STp->try_dio_now && try_rdio;
1551 else
1552 i = STp->try_dio_now && try_wdio;
1553
1554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
1558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
1565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
1569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
1579 else {
1580 bufsize = count;
1581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
1587 if (bufsize > STbp->buffer_size &&
1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
1592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601 }
1602
1603
1604 /* Can be called more than once after each setup_buffer() */
1605 static void release_buffering(struct scsi_tape *STp, int is_read)
1606 {
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1612 STbp->do_dio = 0;
1613 STbp->sg_segs = 0;
1614 }
1615 }
1616
1617
1618 /* Write command */
1619 static ssize_t
1620 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621 {
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
1629 struct st_request *SRpnt = NULL;
1630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
1634
1635 if (mutex_lock_interruptible(&STp->lock))
1636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
1646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
1673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
1777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
1781 if (async_write && !STbp->syscall_result) {
1782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
1793 DEBC_printk(STp, "Error on write:\n");
1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
1808 b_point -= undone;
1809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
1820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
1823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
1835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
1839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
1849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
1851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
1856 retval = STbp->syscall_result;
1857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
1886 st_release_request(SRpnt);
1887 release_buffering(STp, 0);
1888 mutex_unlock(&STp->lock);
1889
1890 return retval;
1891 }
1892 \f
1893 /* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898 */
1899 static long read_tape(struct scsi_tape *STp, long count,
1900 struct st_request ** aSRpnt)
1901 {
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
1904 struct st_request *SRpnt;
1905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
1909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
1937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
1939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
1947 release_buffering(STp, 1);
1948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
1960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
1966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
1977 if (STp->block_size == 0 &&
1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1979 transfer = bytes;
1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
1995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
1997 st_release_request(SRpnt);
1998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
2000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
2003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
2011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
2016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
2031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
2034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
2045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
2048 }
2049 }
2050 /* end of EOF, EOM, ILI test */
2051 else { /* nonzero sense key */
2052 DEBC_printk(STp, "Tape error while reading.\n");
2053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
2067 /* End of extended sense test */
2068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
2073 /* End of error handling */
2074 else { /* Read successful */
2075 STbp->buffer_bytes = bytes;
2076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
2079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087 }
2088 \f
2089
2090 /* Read command */
2091 static ssize_t
2092 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093 {
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
2098 struct st_request *SRpnt = NULL;
2099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
2103
2104 if (mutex_lock_interruptible(&STp->lock))
2105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
2127 DEB(
2128 if (debugging && STps->eof != ST_NOEOF)
2129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
2133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
2179 DEB(
2180 if (debugging && STps->eof != ST_NOEOF)
2181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
2186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
2225 st_release_request(SRpnt);
2226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
2229 release_buffering(STp, 1);
2230 STbp->buffer_bytes = 0;
2231 }
2232 mutex_unlock(&STp->lock);
2233
2234 return retval;
2235 }
2236 \f
2237
2238
2239 DEB(
2240 /* Set the driver options */
2241 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2242 {
2243 if (debugging) {
2244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2265 }
2266 }
2267 )
2268
2269
2270 static int st_set_options(struct scsi_tape *STp, long options)
2271 {
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
2275 struct cdev *cd0, *cd1;
2276 struct device *d0, *d1;
2277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
2280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
2289 modes_defined = 1;
2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
2292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2310 STm->sysv = (options & MT_ST_SYSV) != 0;
2311 STp->sili = (options & MT_ST_SILI) != 0;
2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2313 st_log_options(STp, STm); )
2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
2341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
2343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
2345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
2347 DEB(
2348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
2350 st_log_options(STp, STm); )
2351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
2357 DEBC_printk(STp, "Default block size disabled.\n");
2358 } else {
2359 STm->default_blksize = value;
2360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
2362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
2373 } else {
2374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
2378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
2382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
2384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
2388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
2391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
2397 DEBC_printk(STp,
2398 "Density default disabled.\n");
2399 } else {
2400 STm->default_density = value & 0xff;
2401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
2403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
2411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
2413 } else {
2414 STp->default_drvbuffer = value & 7;
2415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
2418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
2424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
2426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
2429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
2432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
2438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449 }
2450 \f
2451 #define MODE_HEADER_LENGTH 4
2452
2453 /* Mode header and page byte offsets */
2454 #define MH_OFF_DATA_LENGTH 0
2455 #define MH_OFF_MEDIUM_TYPE 1
2456 #define MH_OFF_DEV_SPECIFIC 2
2457 #define MH_OFF_BDESCS_LENGTH 3
2458 #define MP_OFF_PAGE_NBR 0
2459 #define MP_OFF_PAGE_LENGTH 1
2460
2461 /* Mode header and page bit masks */
2462 #define MH_BIT_WP 0x80
2463 #define MP_MSK_PAGE_NBR 0x3f
2464
2465 /* Don't return block descriptors */
2466 #define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468 #define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470 /* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474 {
2475 unsigned char cmd[MAX_COMMAND_SIZE];
2476 struct st_request *SRpnt;
2477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
2489
2490 st_release_request(SRpnt);
2491
2492 return STp->buffer->syscall_result;
2493 }
2494
2495
2496 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499 {
2500 int pgo;
2501 unsigned char cmd[MAX_COMMAND_SIZE];
2502 struct st_request *SRpnt;
2503 int timeout;
2504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
2517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
2523
2524 st_release_request(SRpnt);
2525
2526 return STp->buffer->syscall_result;
2527 }
2528
2529
2530 #define COMPRESSION_PAGE 0x0f
2531 #define COMPRESSION_PAGE_LENGTH 16
2532
2533 #define CP_OFF_DCE_DCC 2
2534 #define CP_OFF_C_ALGO 7
2535
2536 #define DCE_MASK 0x80
2537 #define DCC_MASK 0x40
2538 #define RED_MASK 0x60
2539
2540
2541 /* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547 static int st_compression(struct scsi_tape * STp, int state)
2548 {
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
2552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
2559 DEBC_printk(STp, "Compression mode page not supported.\n");
2560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2569 DEBC_printk(STp, "Compression not supported.\n");
2570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
2587 DEBC_printk(STp, "Compression change failed.\n");
2588 return (-EIO);
2589 }
2590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2591
2592 STp->compression_changed = 1;
2593 return 0;
2594 }
2595
2596
2597 /* Process the load and unload commands (does unload if the load code is zero) */
2598 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599 {
2600 int retval = (-EIO), timeout;
2601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
2603 struct st_request *SRpnt;
2604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
2628 timeout = STp->device->request_queue->rq_timeout;
2629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2636 else
2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2638 );
2639
2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
2642 if (!SRpnt)
2643 return (STp->buffer)->syscall_result;
2644
2645 retval = (STp->buffer)->syscall_result;
2646 st_release_request(SRpnt);
2647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667 }
2668 \f
2669 #if DEBUG
2670 #define ST_DEB_FORWARD 0
2671 #define ST_DEB_BACKWARD 1
2672 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2673 {
2674 s32 sc;
2675
2676 if (!debugging)
2677 return;
2678
2679 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2681 if (direction)
2682 sc = -sc;
2683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2684 direction ? "backward" : "forward", sc, units);
2685 }
2686 #else
2687 #define ST_DEB_FORWARD 0
2688 #define ST_DEB_BACKWARD 1
2689 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2690 #endif
2691
2692
2693 /* Internal ioctl function */
2694 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2695 {
2696 int timeout;
2697 long ltmp;
2698 int ioctl_result;
2699 int chg_eof = 1;
2700 unsigned char cmd[MAX_COMMAND_SIZE];
2701 struct st_request *SRpnt;
2702 struct st_partstat *STps;
2703 int fileno, blkno, at_sm, undone;
2704 int datalen = 0, direction = DMA_NONE;
2705
2706 WARN_ON(STp->buffer->do_dio != 0);
2707 if (STp->ready != ST_READY) {
2708 if (STp->ready == ST_NO_TAPE)
2709 return (-ENOMEDIUM);
2710 else
2711 return (-EIO);
2712 }
2713 timeout = STp->long_timeout;
2714 STps = &(STp->ps[STp->partition]);
2715 fileno = STps->drv_file;
2716 blkno = STps->drv_block;
2717 at_sm = STps->at_sm;
2718
2719 memset(cmd, 0, MAX_COMMAND_SIZE);
2720 switch (cmd_in) {
2721 case MTFSFM:
2722 chg_eof = 0; /* Changed from the FSF after this */
2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
2737 case MTBSF:
2738 cmd[0] = SPACE;
2739 cmd[1] = 0x01; /* Space FileMarks */
2740 ltmp = (-arg);
2741 cmd[2] = (ltmp >> 16);
2742 cmd[3] = (ltmp >> 8);
2743 cmd[4] = ltmp;
2744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2745 if (fileno >= 0)
2746 fileno -= arg;
2747 blkno = (-1); /* We can't know the block number */
2748 at_sm &= (arg == 0);
2749 break;
2750 case MTFSR:
2751 cmd[0] = SPACE;
2752 cmd[1] = 0x00; /* Space Blocks */
2753 cmd[2] = (arg >> 16);
2754 cmd[3] = (arg >> 8);
2755 cmd[4] = arg;
2756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2757 if (blkno >= 0)
2758 blkno += arg;
2759 at_sm &= (arg == 0);
2760 break;
2761 case MTBSR:
2762 cmd[0] = SPACE;
2763 cmd[1] = 0x00; /* Space Blocks */
2764 ltmp = (-arg);
2765 cmd[2] = (ltmp >> 16);
2766 cmd[3] = (ltmp >> 8);
2767 cmd[4] = ltmp;
2768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2769 if (blkno >= 0)
2770 blkno -= arg;
2771 at_sm &= (arg == 0);
2772 break;
2773 case MTFSS:
2774 cmd[0] = SPACE;
2775 cmd[1] = 0x04; /* Space Setmarks */
2776 cmd[2] = (arg >> 16);
2777 cmd[3] = (arg >> 8);
2778 cmd[4] = arg;
2779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2780 if (arg != 0) {
2781 blkno = fileno = (-1);
2782 at_sm = 1;
2783 }
2784 break;
2785 case MTBSS:
2786 cmd[0] = SPACE;
2787 cmd[1] = 0x04; /* Space Setmarks */
2788 ltmp = (-arg);
2789 cmd[2] = (ltmp >> 16);
2790 cmd[3] = (ltmp >> 8);
2791 cmd[4] = ltmp;
2792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2793 if (arg != 0) {
2794 blkno = fileno = (-1);
2795 at_sm = 1;
2796 }
2797 break;
2798 case MTWEOF:
2799 case MTWEOFI:
2800 case MTWSM:
2801 if (STp->write_prot)
2802 return (-EACCES);
2803 cmd[0] = WRITE_FILEMARKS;
2804 if (cmd_in == MTWSM)
2805 cmd[1] = 2;
2806 if (cmd_in == MTWEOFI ||
2807 (cmd_in == MTWEOF && STp->immediate_filemark))
2808 cmd[1] |= 1;
2809 cmd[2] = (arg >> 16);
2810 cmd[3] = (arg >> 8);
2811 cmd[4] = arg;
2812 timeout = STp->device->request_queue->rq_timeout;
2813 DEBC(
2814 if (cmd_in != MTWSM)
2815 st_printk(ST_DEB_MSG, STp,
2816 "Writing %d filemarks.\n",
2817 cmd[2] * 65536 +
2818 cmd[3] * 256 +
2819 cmd[4]);
2820 else
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d setmarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 )
2827 if (fileno >= 0)
2828 fileno += arg;
2829 blkno = 0;
2830 at_sm = (cmd_in == MTWSM);
2831 break;
2832 case MTREW:
2833 cmd[0] = REZERO_UNIT;
2834 if (STp->immediate) {
2835 cmd[1] = 1; /* Don't wait for completion */
2836 timeout = STp->device->request_queue->rq_timeout;
2837 }
2838 DEBC_printk(STp, "Rewinding tape.\n");
2839 fileno = blkno = at_sm = 0;
2840 break;
2841 case MTNOP:
2842 DEBC_printk(STp, "No op on tape.\n");
2843 return 0; /* Should do something ? */
2844 break;
2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
2849 timeout = STp->device->request_queue->rq_timeout;
2850 }
2851 cmd[4] = 3;
2852 DEBC_printk(STp, "Retensioning tape.\n");
2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
2881 timeout = STp->device->request_queue->rq_timeout;
2882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
2886 DEBC_printk(STp, "Erasing tape.\n");
2887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
2933 timeout = STp->device->request_queue->rq_timeout;
2934 DEBC(
2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
2945 if (cmd_in == MTSETDRVBUFFER)
2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
2949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
2957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
2960 ioctl_result = (STp->buffer)->syscall_result;
2961
2962 if (!ioctl_result) { /* SCSI command successful */
2963 st_release_request(SRpnt);
2964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
2977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3014 cmdstatp->have_sense &&
3015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
3026 STps->drv_file = fileno;
3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3078 st_release_request(SRpnt);
3079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
3088 st_release_request(SRpnt);
3089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093 }
3094 \f
3095
3096 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101 {
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
3104 struct st_request *SRpnt;
3105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
3121 if (!SRpnt)
3122 return (STp->buffer)->syscall_result;
3123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
3128 DEBC_printk(STp, " Can't read tape position.\n");
3129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
3149 }
3150 st_release_request(SRpnt);
3151 SRpnt = NULL;
3152
3153 return result;
3154 }
3155
3156
3157 /* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161 {
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
3167 struct st_request *SRpnt;
3168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
3176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
3189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
3192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
3213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
3216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
3220 timeout = STp->device->request_queue->rq_timeout;
3221 }
3222
3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
3225 if (!SRpnt)
3226 return (STp->buffer)->syscall_result;
3227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
3251
3252 st_release_request(SRpnt);
3253 SRpnt = NULL;
3254
3255 return result;
3256 }
3257
3258
3259 /* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261 static int find_partition(struct scsi_tape *STp)
3262 {
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271 }
3272
3273
3274 /* Change the partition if necessary */
3275 static int switch_partition(struct scsi_tape *STp)
3276 {
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285 }
3286 \f
3287 /* Functions for reading and writing the medium partition mode page. */
3288
3289 #define PART_PAGE 0x11
3290 #define PART_PAGE_FIXED_LENGTH 8
3291
3292 #define PP_OFF_MAX_ADD_PARTS 2
3293 #define PP_OFF_NBR_ADD_PARTS 3
3294 #define PP_OFF_FLAGS 4
3295 #define PP_OFF_PART_UNITS 6
3296 #define PP_OFF_RESERVED 7
3297
3298 #define PP_BIT_IDP 0x20
3299 #define PP_MSK_PSUM_MB 0x10
3300
3301 /* Get the number of partitions on the tape. As a side effect reads the
3302 mode page into the tape buffer. */
3303 static int nbr_partitions(struct scsi_tape *STp)
3304 {
3305 int result;
3306
3307 if (STp->ready != ST_READY)
3308 return (-EIO);
3309
3310 result = read_mode_page(STp, PART_PAGE, 1);
3311
3312 if (result) {
3313 DEBC_printk(STp, "Can't read medium partition page.\n");
3314 result = (-EIO);
3315 } else {
3316 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3317 PP_OFF_NBR_ADD_PARTS] + 1;
3318 DEBC_printk(STp, "Number of partitions %d.\n", result);
3319 }
3320
3321 return result;
3322 }
3323
3324
3325 /* Partition the tape into two partitions if size > 0 or one partition if
3326 size == 0.
3327
3328 The block descriptors are read and written because Sony SDT-7000 does not
3329 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3330
3331 My HP C1533A drive returns only one partition size field. This is used to
3332 set the size of partition 1. There is no size field for the default partition.
3333 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3334 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3335 The following algorithm is used to accommodate both drives: if the number of
3336 partition size fields is greater than the maximum number of additional partitions
3337 in the mode page, the second field is used. Otherwise the first field is used.
3338
3339 For Seagate DDS drives the page length must be 8 when no partitions is defined
3340 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3341 is acceptable also to some other old drives and enforced if the first partition
3342 size field is used for the first additional partition size.
3343 */
3344 static int partition_tape(struct scsi_tape *STp, int size)
3345 {
3346 int result;
3347 int pgo, psd_cnt, psdo;
3348 unsigned char *bp;
3349
3350 result = read_mode_page(STp, PART_PAGE, 0);
3351 if (result) {
3352 DEBC_printk(STp, "Can't read partition mode page.\n");
3353 return result;
3354 }
3355 /* The mode page is in the buffer. Let's modify it and write it. */
3356 bp = (STp->buffer)->b_data;
3357 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3358 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3359 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3360
3361 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3362 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3363 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3364 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3365 psdo += 2;
3366 }
3367 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3368
3369 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3370 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3371 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3372
3373 if (size <= 0) {
3374 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3375 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3376 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3377 DEBC_printk(STp, "Formatting tape with one partition.\n");
3378 } else {
3379 bp[psdo] = (size >> 8) & 0xff;
3380 bp[psdo + 1] = size & 0xff;
3381 bp[pgo + 3] = 1;
3382 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3383 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3384 DEBC_printk(STp, "Formatting tape with two partitions "
3385 "(1 = %d MB).\n", size);
3386 }
3387 bp[pgo + PP_OFF_PART_UNITS] = 0;
3388 bp[pgo + PP_OFF_RESERVED] = 0;
3389 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3390
3391 result = write_mode_page(STp, PART_PAGE, 1);
3392 if (result) {
3393 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3394 result = (-EIO);
3395 }
3396
3397 return result;
3398 }
3399 \f
3400
3401
3402 /* The ioctl command */
3403 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3404 {
3405 int i, cmd_nr, cmd_type, bt;
3406 int retval = 0;
3407 unsigned int blk;
3408 struct scsi_tape *STp = file->private_data;
3409 struct st_modedef *STm;
3410 struct st_partstat *STps;
3411 void __user *p = (void __user *)arg;
3412
3413 if (mutex_lock_interruptible(&STp->lock))
3414 return -ERESTARTSYS;
3415
3416 DEB(
3417 if (debugging && !STp->in_use) {
3418 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3419 retval = (-EIO);
3420 goto out;
3421 } ) /* end DEB */
3422
3423 STm = &(STp->modes[STp->current_mode]);
3424 STps = &(STp->ps[STp->partition]);
3425
3426 /*
3427 * If we are in the middle of error recovery, don't let anyone
3428 * else try and use this device. Also, if error recovery fails, it
3429 * may try and take the device offline, in which case all further
3430 * access to the device is prohibited.
3431 */
3432 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3433 file->f_flags & O_NDELAY);
3434 if (retval)
3435 goto out;
3436
3437 cmd_type = _IOC_TYPE(cmd_in);
3438 cmd_nr = _IOC_NR(cmd_in);
3439
3440 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3441 struct mtop mtc;
3442
3443 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3444 retval = (-EINVAL);
3445 goto out;
3446 }
3447
3448 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3449 if (i) {
3450 retval = (-EFAULT);
3451 goto out;
3452 }
3453
3454 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3455 st_printk(KERN_WARNING, STp,
3456 "MTSETDRVBUFFER only allowed for root.\n");
3457 retval = (-EPERM);
3458 goto out;
3459 }
3460 if (!STm->defined &&
3461 (mtc.mt_op != MTSETDRVBUFFER &&
3462 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3463 retval = (-ENXIO);
3464 goto out;
3465 }
3466
3467 if (!STp->pos_unknown) {
3468
3469 if (STps->eof == ST_FM_HIT) {
3470 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3471 mtc.mt_op == MTEOM) {
3472 mtc.mt_count -= 1;
3473 if (STps->drv_file >= 0)
3474 STps->drv_file += 1;
3475 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3476 mtc.mt_count += 1;
3477 if (STps->drv_file >= 0)
3478 STps->drv_file += 1;
3479 }
3480 }
3481
3482 if (mtc.mt_op == MTSEEK) {
3483 /* Old position must be restored if partition will be
3484 changed */
3485 i = !STp->can_partitions ||
3486 (STp->new_partition != STp->partition);
3487 } else {
3488 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3489 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3490 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3491 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3492 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3493 mtc.mt_op == MTCOMPRESSION;
3494 }
3495 i = flush_buffer(STp, i);
3496 if (i < 0) {
3497 retval = i;
3498 goto out;
3499 }
3500 if (STps->rw == ST_WRITING &&
3501 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3502 mtc.mt_op == MTSEEK ||
3503 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3504 i = st_int_ioctl(STp, MTWEOF, 1);
3505 if (i < 0) {
3506 retval = i;
3507 goto out;
3508 }
3509 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3510 mtc.mt_count++;
3511 STps->rw = ST_IDLE;
3512 }
3513
3514 } else {
3515 /*
3516 * If there was a bus reset, block further access
3517 * to this device. If the user wants to rewind the tape,
3518 * then reset the flag and allow access again.
3519 */
3520 if (mtc.mt_op != MTREW &&
3521 mtc.mt_op != MTOFFL &&
3522 mtc.mt_op != MTRETEN &&
3523 mtc.mt_op != MTERASE &&
3524 mtc.mt_op != MTSEEK &&
3525 mtc.mt_op != MTEOM) {
3526 retval = (-EIO);
3527 goto out;
3528 }
3529 reset_state(STp);
3530 /* remove this when the midlevel properly clears was_reset */
3531 STp->device->was_reset = 0;
3532 }
3533
3534 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3535 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3536 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3537 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3538
3539 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3540 do_door_lock(STp, 0); /* Ignore result! */
3541
3542 if (mtc.mt_op == MTSETDRVBUFFER &&
3543 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3544 retval = st_set_options(STp, mtc.mt_count);
3545 goto out;
3546 }
3547
3548 if (mtc.mt_op == MTSETPART) {
3549 if (!STp->can_partitions ||
3550 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3551 retval = (-EINVAL);
3552 goto out;
3553 }
3554 if (mtc.mt_count >= STp->nbr_partitions &&
3555 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3556 retval = (-EIO);
3557 goto out;
3558 }
3559 if (mtc.mt_count >= STp->nbr_partitions) {
3560 retval = (-EINVAL);
3561 goto out;
3562 }
3563 STp->new_partition = mtc.mt_count;
3564 retval = 0;
3565 goto out;
3566 }
3567
3568 if (mtc.mt_op == MTMKPART) {
3569 if (!STp->can_partitions) {
3570 retval = (-EINVAL);
3571 goto out;
3572 }
3573 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3574 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3575 retval = i;
3576 goto out;
3577 }
3578 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3579 STp->ps[i].rw = ST_IDLE;
3580 STp->ps[i].at_sm = 0;
3581 STp->ps[i].last_block_valid = 0;
3582 }
3583 STp->partition = STp->new_partition = 0;
3584 STp->nbr_partitions = 1; /* Bad guess ?-) */
3585 STps->drv_block = STps->drv_file = 0;
3586 retval = 0;
3587 goto out;
3588 }
3589
3590 if (mtc.mt_op == MTSEEK) {
3591 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3592 if (!STp->can_partitions)
3593 STp->ps[0].rw = ST_IDLE;
3594 retval = i;
3595 goto out;
3596 }
3597
3598 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3599 retval = do_load_unload(STp, file, 0);
3600 goto out;
3601 }
3602
3603 if (mtc.mt_op == MTLOAD) {
3604 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3605 goto out;
3606 }
3607
3608 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3609 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3610 goto out;
3611 }
3612
3613 if (STp->can_partitions && STp->ready == ST_READY &&
3614 (i = switch_partition(STp)) < 0) {
3615 retval = i;
3616 goto out;
3617 }
3618
3619 if (mtc.mt_op == MTCOMPRESSION)
3620 retval = st_compression(STp, (mtc.mt_count & 1));
3621 else
3622 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3623 goto out;
3624 }
3625 if (!STm->defined) {
3626 retval = (-ENXIO);
3627 goto out;
3628 }
3629
3630 if ((i = flush_buffer(STp, 0)) < 0) {
3631 retval = i;
3632 goto out;
3633 }
3634 if (STp->can_partitions &&
3635 (i = switch_partition(STp)) < 0) {
3636 retval = i;
3637 goto out;
3638 }
3639
3640 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3641 struct mtget mt_status;
3642
3643 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3644 retval = (-EINVAL);
3645 goto out;
3646 }
3647
3648 mt_status.mt_type = STp->tape_type;
3649 mt_status.mt_dsreg =
3650 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3651 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3652 mt_status.mt_blkno = STps->drv_block;
3653 mt_status.mt_fileno = STps->drv_file;
3654 if (STp->block_size != 0) {
3655 if (STps->rw == ST_WRITING)
3656 mt_status.mt_blkno +=
3657 (STp->buffer)->buffer_bytes / STp->block_size;
3658 else if (STps->rw == ST_READING)
3659 mt_status.mt_blkno -=
3660 ((STp->buffer)->buffer_bytes +
3661 STp->block_size - 1) / STp->block_size;
3662 }
3663
3664 mt_status.mt_gstat = 0;
3665 if (STp->drv_write_prot)
3666 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3667 if (mt_status.mt_blkno == 0) {
3668 if (mt_status.mt_fileno == 0)
3669 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3670 else
3671 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3672 }
3673 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3674 mt_status.mt_resid = STp->partition;
3675 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3676 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3677 else if (STps->eof >= ST_EOM_OK)
3678 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3679 if (STp->density == 1)
3680 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3681 else if (STp->density == 2)
3682 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3683 else if (STp->density == 3)
3684 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3685 if (STp->ready == ST_READY)
3686 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3687 if (STp->ready == ST_NO_TAPE)
3688 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3689 if (STps->at_sm)
3690 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3691 if (STm->do_async_writes ||
3692 (STm->do_buffer_writes && STp->block_size != 0) ||
3693 STp->drv_buffer != 0)
3694 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3695 if (STp->cleaning_req)
3696 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3697
3698 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3699 if (i) {
3700 retval = (-EFAULT);
3701 goto out;
3702 }
3703
3704 STp->recover_reg = 0; /* Clear after read */
3705 retval = 0;
3706 goto out;
3707 } /* End of MTIOCGET */
3708 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3709 struct mtpos mt_pos;
3710 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3711 retval = (-EINVAL);
3712 goto out;
3713 }
3714 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718 mt_pos.mt_blkno = blk;
3719 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3720 if (i)
3721 retval = (-EFAULT);
3722 goto out;
3723 }
3724 mutex_unlock(&STp->lock);
3725 switch (cmd_in) {
3726 case SCSI_IOCTL_GET_IDLUN:
3727 case SCSI_IOCTL_GET_BUS_NUMBER:
3728 break;
3729 default:
3730 if ((cmd_in == SG_IO ||
3731 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3732 cmd_in == CDROM_SEND_PACKET) &&
3733 !capable(CAP_SYS_RAWIO))
3734 i = -EPERM;
3735 else
3736 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3737 file->f_mode, cmd_in, p);
3738 if (i != -ENOTTY)
3739 return i;
3740 break;
3741 }
3742 retval = scsi_ioctl(STp->device, cmd_in, p);
3743 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3744 STp->rew_at_close = 0;
3745 STp->ready = ST_NO_TAPE;
3746 }
3747 return retval;
3748
3749 out:
3750 mutex_unlock(&STp->lock);
3751 return retval;
3752 }
3753
3754 #ifdef CONFIG_COMPAT
3755 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3756 {
3757 struct scsi_tape *STp = file->private_data;
3758 struct scsi_device *sdev = STp->device;
3759 int ret = -ENOIOCTLCMD;
3760 if (sdev->host->hostt->compat_ioctl) {
3761
3762 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3763
3764 }
3765 return ret;
3766 }
3767 #endif
3768
3769 \f
3770
3771 /* Try to allocate a new tape buffer. Calling function must not hold
3772 dev_arr_lock. */
3773 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3774 {
3775 struct st_buffer *tb;
3776
3777 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3778 if (!tb) {
3779 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3780 return NULL;
3781 }
3782 tb->frp_segs = 0;
3783 tb->use_sg = max_sg;
3784 tb->dma = need_dma;
3785 tb->buffer_size = 0;
3786
3787 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3788 GFP_ATOMIC);
3789 if (!tb->reserved_pages) {
3790 kfree(tb);
3791 return NULL;
3792 }
3793
3794 return tb;
3795 }
3796
3797
3798 /* Try to allocate enough space in the tape buffer */
3799 #define ST_MAX_ORDER 6
3800
3801 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3802 {
3803 int segs, max_segs, b_size, order, got;
3804 gfp_t priority;
3805
3806 if (new_size <= STbuffer->buffer_size)
3807 return 1;
3808
3809 if (STbuffer->buffer_size <= PAGE_SIZE)
3810 normalize_buffer(STbuffer); /* Avoid extra segment */
3811
3812 max_segs = STbuffer->use_sg;
3813
3814 priority = GFP_KERNEL | __GFP_NOWARN;
3815 if (need_dma)
3816 priority |= GFP_DMA;
3817
3818 if (STbuffer->cleared)
3819 priority |= __GFP_ZERO;
3820
3821 if (STbuffer->frp_segs) {
3822 order = STbuffer->reserved_page_order;
3823 b_size = PAGE_SIZE << order;
3824 } else {
3825 for (b_size = PAGE_SIZE, order = 0;
3826 order < ST_MAX_ORDER &&
3827 max_segs * (PAGE_SIZE << order) < new_size;
3828 order++, b_size *= 2)
3829 ; /* empty */
3830 STbuffer->reserved_page_order = order;
3831 }
3832 if (max_segs * (PAGE_SIZE << order) < new_size) {
3833 if (order == ST_MAX_ORDER)
3834 return 0;
3835 normalize_buffer(STbuffer);
3836 return enlarge_buffer(STbuffer, new_size, need_dma);
3837 }
3838
3839 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3840 segs < max_segs && got < new_size;) {
3841 struct page *page;
3842
3843 page = alloc_pages(priority, order);
3844 if (!page) {
3845 DEB(STbuffer->buffer_size = got);
3846 normalize_buffer(STbuffer);
3847 return 0;
3848 }
3849
3850 STbuffer->frp_segs += 1;
3851 got += b_size;
3852 STbuffer->buffer_size = got;
3853 STbuffer->reserved_pages[segs] = page;
3854 segs++;
3855 }
3856 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3857
3858 return 1;
3859 }
3860
3861
3862 /* Make sure that no data from previous user is in the internal buffer */
3863 static void clear_buffer(struct st_buffer * st_bp)
3864 {
3865 int i;
3866
3867 for (i=0; i < st_bp->frp_segs; i++)
3868 memset(page_address(st_bp->reserved_pages[i]), 0,
3869 PAGE_SIZE << st_bp->reserved_page_order);
3870 st_bp->cleared = 1;
3871 }
3872
3873
3874 /* Release the extra buffer */
3875 static void normalize_buffer(struct st_buffer * STbuffer)
3876 {
3877 int i, order = STbuffer->reserved_page_order;
3878
3879 for (i = 0; i < STbuffer->frp_segs; i++) {
3880 __free_pages(STbuffer->reserved_pages[i], order);
3881 STbuffer->buffer_size -= (PAGE_SIZE << order);
3882 }
3883 STbuffer->frp_segs = 0;
3884 STbuffer->sg_segs = 0;
3885 STbuffer->reserved_page_order = 0;
3886 STbuffer->map_data.offset = 0;
3887 }
3888
3889
3890 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3891 negative error code. */
3892 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3893 {
3894 int i, cnt, res, offset;
3895 int length = PAGE_SIZE << st_bp->reserved_page_order;
3896
3897 for (i = 0, offset = st_bp->buffer_bytes;
3898 i < st_bp->frp_segs && offset >= length; i++)
3899 offset -= length;
3900 if (i == st_bp->frp_segs) { /* Should never happen */
3901 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3902 return (-EIO);
3903 }
3904 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3905 struct page *page = st_bp->reserved_pages[i];
3906 cnt = length - offset < do_count ? length - offset : do_count;
3907 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3908 if (res)
3909 return (-EFAULT);
3910 do_count -= cnt;
3911 st_bp->buffer_bytes += cnt;
3912 ubp += cnt;
3913 offset = 0;
3914 }
3915 if (do_count) /* Should never happen */
3916 return (-EIO);
3917
3918 return 0;
3919 }
3920
3921
3922 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
3923 negative error code. */
3924 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3925 {
3926 int i, cnt, res, offset;
3927 int length = PAGE_SIZE << st_bp->reserved_page_order;
3928
3929 for (i = 0, offset = st_bp->read_pointer;
3930 i < st_bp->frp_segs && offset >= length; i++)
3931 offset -= length;
3932 if (i == st_bp->frp_segs) { /* Should never happen */
3933 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3934 return (-EIO);
3935 }
3936 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3937 struct page *page = st_bp->reserved_pages[i];
3938 cnt = length - offset < do_count ? length - offset : do_count;
3939 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3940 if (res)
3941 return (-EFAULT);
3942 do_count -= cnt;
3943 st_bp->buffer_bytes -= cnt;
3944 st_bp->read_pointer += cnt;
3945 ubp += cnt;
3946 offset = 0;
3947 }
3948 if (do_count) /* Should never happen */
3949 return (-EIO);
3950
3951 return 0;
3952 }
3953
3954
3955 /* Move data towards start of buffer */
3956 static void move_buffer_data(struct st_buffer * st_bp, int offset)
3957 {
3958 int src_seg, dst_seg, src_offset = 0, dst_offset;
3959 int count, total;
3960 int length = PAGE_SIZE << st_bp->reserved_page_order;
3961
3962 if (offset == 0)
3963 return;
3964
3965 total=st_bp->buffer_bytes - offset;
3966 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3967 src_offset = offset;
3968 if (src_offset < length)
3969 break;
3970 offset -= length;
3971 }
3972
3973 st_bp->buffer_bytes = st_bp->read_pointer = total;
3974 for (dst_seg=dst_offset=0; total > 0; ) {
3975 struct page *dpage = st_bp->reserved_pages[dst_seg];
3976 struct page *spage = st_bp->reserved_pages[src_seg];
3977
3978 count = min(length - dst_offset, length - src_offset);
3979 memmove(page_address(dpage) + dst_offset,
3980 page_address(spage) + src_offset, count);
3981 src_offset += count;
3982 if (src_offset >= length) {
3983 src_seg++;
3984 src_offset = 0;
3985 }
3986 dst_offset += count;
3987 if (dst_offset >= length) {
3988 dst_seg++;
3989 dst_offset = 0;
3990 }
3991 total -= count;
3992 }
3993 }
3994
3995 /* Validate the options from command line or module parameters */
3996 static void validate_options(void)
3997 {
3998 if (buffer_kbs > 0)
3999 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4000 if (max_sg_segs >= ST_FIRST_SG)
4001 st_max_sg_segs = max_sg_segs;
4002 }
4003
4004 #ifndef MODULE
4005 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4006 */
4007 static int __init st_setup(char *str)
4008 {
4009 int i, len, ints[5];
4010 char *stp;
4011
4012 stp = get_options(str, ARRAY_SIZE(ints), ints);
4013
4014 if (ints[0] > 0) {
4015 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4016 if (parms[i].val)
4017 *parms[i].val = ints[i + 1];
4018 } else {
4019 while (stp != NULL) {
4020 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4021 len = strlen(parms[i].name);
4022 if (!strncmp(stp, parms[i].name, len) &&
4023 (*(stp + len) == ':' || *(stp + len) == '=')) {
4024 if (parms[i].val)
4025 *parms[i].val =
4026 simple_strtoul(stp + len + 1, NULL, 0);
4027 else
4028 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4029 parms[i].name);
4030 break;
4031 }
4032 }
4033 if (i >= ARRAY_SIZE(parms))
4034 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4035 stp);
4036 stp = strchr(stp, ',');
4037 if (stp)
4038 stp++;
4039 }
4040 }
4041
4042 validate_options();
4043
4044 return 1;
4045 }
4046
4047 __setup("st=", st_setup);
4048
4049 #endif
4050
4051 static const struct file_operations st_fops =
4052 {
4053 .owner = THIS_MODULE,
4054 .read = st_read,
4055 .write = st_write,
4056 .unlocked_ioctl = st_ioctl,
4057 #ifdef CONFIG_COMPAT
4058 .compat_ioctl = st_compat_ioctl,
4059 #endif
4060 .open = st_open,
4061 .flush = st_flush,
4062 .release = st_release,
4063 .llseek = noop_llseek,
4064 };
4065
4066 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4067 {
4068 int i, error;
4069 dev_t cdev_devno;
4070 struct cdev *cdev;
4071 struct device *dev;
4072 struct st_modedef *STm = &(tape->modes[mode]);
4073 char name[10];
4074 int dev_num = tape->index;
4075
4076 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4077
4078 cdev = cdev_alloc();
4079 if (!cdev) {
4080 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4081 error = -ENOMEM;
4082 goto out;
4083 }
4084 cdev->owner = THIS_MODULE;
4085 cdev->ops = &st_fops;
4086 STm->cdevs[rew] = cdev;
4087
4088 error = cdev_add(cdev, cdev_devno, 1);
4089 if (error) {
4090 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4091 rew ? "non" : "auto", mode);
4092 pr_err("st%d: Device not attached.\n", dev_num);
4093 goto out_free;
4094 }
4095
4096 i = mode << (4 - ST_NBR_MODE_BITS);
4097 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4098 tape->disk->disk_name, st_formats[i]);
4099
4100 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4101 cdev_devno, &tape->modes[mode], "%s", name);
4102 if (IS_ERR(dev)) {
4103 pr_err("st%d: device_create failed\n", dev_num);
4104 error = PTR_ERR(dev);
4105 goto out_free;
4106 }
4107
4108 STm->devs[rew] = dev;
4109
4110 return 0;
4111 out_free:
4112 cdev_del(STm->cdevs[rew]);
4113 out:
4114 STm->cdevs[rew] = NULL;
4115 STm->devs[rew] = NULL;
4116 return error;
4117 }
4118
4119 static int create_cdevs(struct scsi_tape *tape)
4120 {
4121 int mode, error;
4122 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4123 error = create_one_cdev(tape, mode, 0);
4124 if (error)
4125 return error;
4126 error = create_one_cdev(tape, mode, 1);
4127 if (error)
4128 return error;
4129 }
4130
4131 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4132 &tape->modes[0].devs[0]->kobj, "tape");
4133 }
4134
4135 static void remove_cdevs(struct scsi_tape *tape)
4136 {
4137 int mode, rew;
4138 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4139 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4140 struct st_modedef *STm = &(tape->modes[mode]);
4141 for (rew = 0; rew < 2; rew++) {
4142 if (STm->cdevs[rew])
4143 cdev_del(STm->cdevs[rew]);
4144 if (STm->devs[rew])
4145 device_unregister(STm->devs[rew]);
4146 }
4147 }
4148 }
4149
4150 static int st_probe(struct device *dev)
4151 {
4152 struct scsi_device *SDp = to_scsi_device(dev);
4153 struct gendisk *disk = NULL;
4154 struct scsi_tape *tpnt = NULL;
4155 struct st_modedef *STm;
4156 struct st_partstat *STps;
4157 struct st_buffer *buffer;
4158 int i, error;
4159 char *stp;
4160
4161 if (SDp->type != TYPE_TAPE)
4162 return -ENODEV;
4163 if ((stp = st_incompatible(SDp))) {
4164 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4165 sdev_printk(KERN_INFO, SDp,
4166 "st: The suggested driver is %s.\n", stp);
4167 return -ENODEV;
4168 }
4169
4170 scsi_autopm_get_device(SDp);
4171 i = queue_max_segments(SDp->request_queue);
4172 if (st_max_sg_segs < i)
4173 i = st_max_sg_segs;
4174 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4175 if (buffer == NULL) {
4176 sdev_printk(KERN_ERR, SDp,
4177 "st: Can't allocate new tape buffer. "
4178 "Device not attached.\n");
4179 goto out;
4180 }
4181
4182 disk = alloc_disk(1);
4183 if (!disk) {
4184 sdev_printk(KERN_ERR, SDp,
4185 "st: out of memory. Device not attached.\n");
4186 goto out_buffer_free;
4187 }
4188
4189 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4190 if (tpnt == NULL) {
4191 sdev_printk(KERN_ERR, SDp,
4192 "st: Can't allocate device descriptor.\n");
4193 goto out_put_disk;
4194 }
4195 kref_init(&tpnt->kref);
4196 tpnt->disk = disk;
4197 disk->private_data = &tpnt->driver;
4198 disk->queue = SDp->request_queue;
4199 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4200 * take queue reference that release_disk() expects. */
4201 if (!blk_get_queue(disk->queue))
4202 goto out_put_disk;
4203 tpnt->driver = &st_template;
4204
4205 tpnt->device = SDp;
4206 if (SDp->scsi_level <= 2)
4207 tpnt->tape_type = MT_ISSCSI1;
4208 else
4209 tpnt->tape_type = MT_ISSCSI2;
4210
4211 tpnt->buffer = buffer;
4212 tpnt->buffer->last_SRpnt = NULL;
4213
4214 tpnt->inited = 0;
4215 tpnt->dirty = 0;
4216 tpnt->in_use = 0;
4217 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4218 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4219 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4220 tpnt->density = 0;
4221 tpnt->do_auto_lock = ST_AUTO_LOCK;
4222 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4223 tpnt->can_partitions = 0;
4224 tpnt->two_fm = ST_TWO_FM;
4225 tpnt->fast_mteom = ST_FAST_MTEOM;
4226 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4227 tpnt->sili = ST_SILI;
4228 tpnt->immediate = ST_NOWAIT;
4229 tpnt->immediate_filemark = 0;
4230 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4231 tpnt->partition = 0;
4232 tpnt->new_partition = 0;
4233 tpnt->nbr_partitions = 0;
4234 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4235 tpnt->long_timeout = ST_LONG_TIMEOUT;
4236 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4237
4238 for (i = 0; i < ST_NBR_MODES; i++) {
4239 STm = &(tpnt->modes[i]);
4240 STm->defined = 0;
4241 STm->sysv = ST_SYSV;
4242 STm->defaults_for_writes = 0;
4243 STm->do_async_writes = ST_ASYNC_WRITES;
4244 STm->do_buffer_writes = ST_BUFFER_WRITES;
4245 STm->do_read_ahead = ST_READ_AHEAD;
4246 STm->default_compression = ST_DONT_TOUCH;
4247 STm->default_blksize = (-1); /* No forced size */
4248 STm->default_density = (-1); /* No forced density */
4249 STm->tape = tpnt;
4250 }
4251
4252 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4253 STps = &(tpnt->ps[i]);
4254 STps->rw = ST_IDLE;
4255 STps->eof = ST_NOEOF;
4256 STps->at_sm = 0;
4257 STps->last_block_valid = 0;
4258 STps->drv_block = (-1);
4259 STps->drv_file = (-1);
4260 }
4261
4262 tpnt->current_mode = 0;
4263 tpnt->modes[0].defined = 1;
4264
4265 tpnt->density_changed = tpnt->compression_changed =
4266 tpnt->blksize_changed = 0;
4267 mutex_init(&tpnt->lock);
4268
4269 idr_preload(GFP_KERNEL);
4270 spin_lock(&st_index_lock);
4271 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4272 spin_unlock(&st_index_lock);
4273 idr_preload_end();
4274 if (error < 0) {
4275 pr_warn("st: idr allocation failed: %d\n", error);
4276 goto out_put_queue;
4277 }
4278 tpnt->index = error;
4279 sprintf(disk->disk_name, "st%d", tpnt->index);
4280 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4281 if (tpnt->stats == NULL) {
4282 sdev_printk(KERN_ERR, SDp,
4283 "st: Can't allocate statistics.\n");
4284 goto out_idr_remove;
4285 }
4286
4287 dev_set_drvdata(dev, tpnt);
4288
4289
4290 error = create_cdevs(tpnt);
4291 if (error)
4292 goto out_remove_devs;
4293 scsi_autopm_put_device(SDp);
4294
4295 sdev_printk(KERN_NOTICE, SDp,
4296 "Attached scsi tape %s\n", tape_name(tpnt));
4297 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4298 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4299 queue_dma_alignment(SDp->request_queue) + 1);
4300
4301 return 0;
4302
4303 out_remove_devs:
4304 remove_cdevs(tpnt);
4305 kfree(tpnt->stats);
4306 out_idr_remove:
4307 spin_lock(&st_index_lock);
4308 idr_remove(&st_index_idr, tpnt->index);
4309 spin_unlock(&st_index_lock);
4310 out_put_queue:
4311 blk_put_queue(disk->queue);
4312 out_put_disk:
4313 put_disk(disk);
4314 kfree(tpnt);
4315 out_buffer_free:
4316 kfree(buffer);
4317 out:
4318 scsi_autopm_put_device(SDp);
4319 return -ENODEV;
4320 };
4321
4322
4323 static int st_remove(struct device *dev)
4324 {
4325 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4326 int index = tpnt->index;
4327
4328 scsi_autopm_get_device(to_scsi_device(dev));
4329 remove_cdevs(tpnt);
4330
4331 mutex_lock(&st_ref_mutex);
4332 kref_put(&tpnt->kref, scsi_tape_release);
4333 mutex_unlock(&st_ref_mutex);
4334 spin_lock(&st_index_lock);
4335 idr_remove(&st_index_idr, index);
4336 spin_unlock(&st_index_lock);
4337 return 0;
4338 }
4339
4340 /**
4341 * scsi_tape_release - Called to free the Scsi_Tape structure
4342 * @kref: pointer to embedded kref
4343 *
4344 * st_ref_mutex must be held entering this routine. Because it is
4345 * called on last put, you should always use the scsi_tape_get()
4346 * scsi_tape_put() helpers which manipulate the semaphore directly
4347 * and never do a direct kref_put().
4348 **/
4349 static void scsi_tape_release(struct kref *kref)
4350 {
4351 struct scsi_tape *tpnt = to_scsi_tape(kref);
4352 struct gendisk *disk = tpnt->disk;
4353
4354 tpnt->device = NULL;
4355
4356 if (tpnt->buffer) {
4357 normalize_buffer(tpnt->buffer);
4358 kfree(tpnt->buffer->reserved_pages);
4359 kfree(tpnt->buffer);
4360 }
4361
4362 disk->private_data = NULL;
4363 put_disk(disk);
4364 kfree(tpnt->stats);
4365 kfree(tpnt);
4366 return;
4367 }
4368
4369 static struct class st_sysfs_class = {
4370 .name = "scsi_tape",
4371 .dev_groups = st_dev_groups,
4372 };
4373
4374 static int __init init_st(void)
4375 {
4376 int err;
4377
4378 validate_options();
4379
4380 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4381 verstr, st_fixed_buffer_size, st_max_sg_segs);
4382
4383 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4384 if (debugging) {
4385 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4386 debugging);
4387 }
4388
4389 err = class_register(&st_sysfs_class);
4390 if (err) {
4391 pr_err("Unable register sysfs class for SCSI tapes\n");
4392 return err;
4393 }
4394
4395 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4396 ST_MAX_TAPE_ENTRIES, "st");
4397 if (err) {
4398 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4399 SCSI_TAPE_MAJOR);
4400 goto err_class;
4401 }
4402
4403 err = scsi_register_driver(&st_template.gendrv);
4404 if (err)
4405 goto err_chrdev;
4406
4407 return 0;
4408
4409 err_chrdev:
4410 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4411 ST_MAX_TAPE_ENTRIES);
4412 err_class:
4413 class_unregister(&st_sysfs_class);
4414 return err;
4415 }
4416
4417 static void __exit exit_st(void)
4418 {
4419 scsi_unregister_driver(&st_template.gendrv);
4420 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4421 ST_MAX_TAPE_ENTRIES);
4422 class_unregister(&st_sysfs_class);
4423 idr_destroy(&st_index_idr);
4424 printk(KERN_INFO "st: Unloaded.\n");
4425 }
4426
4427 module_init(init_st);
4428 module_exit(exit_st);
4429
4430
4431 /* The sysfs driver interface. Read-only at the moment */
4432 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4433 {
4434 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4435 }
4436 static DRIVER_ATTR_RO(try_direct_io);
4437
4438 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4439 {
4440 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4441 }
4442 static DRIVER_ATTR_RO(fixed_buffer_size);
4443
4444 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4445 {
4446 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4447 }
4448 static DRIVER_ATTR_RO(max_sg_segs);
4449
4450 static ssize_t version_show(struct device_driver *ddd, char *buf)
4451 {
4452 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4453 }
4454 static DRIVER_ATTR_RO(version);
4455
4456 #if DEBUG
4457 static ssize_t debug_flag_store(struct device_driver *ddp,
4458 const char *buf, size_t count)
4459 {
4460 /* We only care what the first byte of the data is the rest is unused.
4461 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4462 * other values have -EINVAL returned if they are passed in.
4463 */
4464 if (count > 0) {
4465 if (buf[0] == '0') {
4466 debugging = NO_DEBUG;
4467 return count;
4468 } else if (buf[0] == '1') {
4469 debugging = 1;
4470 return count;
4471 }
4472 }
4473 return -EINVAL;
4474 }
4475
4476 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4477 {
4478 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4479 }
4480 static DRIVER_ATTR_RW(debug_flag);
4481 #endif
4482
4483 static struct attribute *st_drv_attrs[] = {
4484 &driver_attr_try_direct_io.attr,
4485 &driver_attr_fixed_buffer_size.attr,
4486 &driver_attr_max_sg_segs.attr,
4487 &driver_attr_version.attr,
4488 #if DEBUG
4489 &driver_attr_debug_flag.attr,
4490 #endif
4491 NULL,
4492 };
4493 ATTRIBUTE_GROUPS(st_drv);
4494
4495 /* The sysfs simple class interface */
4496 static ssize_t
4497 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4498 {
4499 struct st_modedef *STm = dev_get_drvdata(dev);
4500 ssize_t l = 0;
4501
4502 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4503 return l;
4504 }
4505 static DEVICE_ATTR_RO(defined);
4506
4507 static ssize_t
4508 default_blksize_show(struct device *dev, struct device_attribute *attr,
4509 char *buf)
4510 {
4511 struct st_modedef *STm = dev_get_drvdata(dev);
4512 ssize_t l = 0;
4513
4514 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4515 return l;
4516 }
4517 static DEVICE_ATTR_RO(default_blksize);
4518
4519 static ssize_t
4520 default_density_show(struct device *dev, struct device_attribute *attr,
4521 char *buf)
4522 {
4523 struct st_modedef *STm = dev_get_drvdata(dev);
4524 ssize_t l = 0;
4525 char *fmt;
4526
4527 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4528 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4529 return l;
4530 }
4531 static DEVICE_ATTR_RO(default_density);
4532
4533 static ssize_t
4534 default_compression_show(struct device *dev, struct device_attribute *attr,
4535 char *buf)
4536 {
4537 struct st_modedef *STm = dev_get_drvdata(dev);
4538 ssize_t l = 0;
4539
4540 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4541 return l;
4542 }
4543 static DEVICE_ATTR_RO(default_compression);
4544
4545 static ssize_t
4546 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4547 {
4548 struct st_modedef *STm = dev_get_drvdata(dev);
4549 struct scsi_tape *STp = STm->tape;
4550 int options;
4551 ssize_t l = 0;
4552
4553 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4554 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4555 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4556 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4557 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4558 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4559 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4560 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4561 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4562 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4563 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4564 options |= STm->sysv ? MT_ST_SYSV : 0;
4565 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4566 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4567 options |= STp->sili ? MT_ST_SILI : 0;
4568
4569 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4570 return l;
4571 }
4572 static DEVICE_ATTR_RO(options);
4573
4574 /* Support for tape stats */
4575
4576 /**
4577 * read_cnt_show - return read count - count of reads made from tape drive
4578 * @dev: struct device
4579 * @attr: attribute structure
4580 * @buf: buffer to return formatted data in
4581 */
4582 static ssize_t read_cnt_show(struct device *dev,
4583 struct device_attribute *attr, char *buf)
4584 {
4585 struct st_modedef *STm = dev_get_drvdata(dev);
4586
4587 return sprintf(buf, "%lld",
4588 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4589 }
4590 static DEVICE_ATTR_RO(read_cnt);
4591
4592 /**
4593 * read_byte_cnt_show - return read byte count - tape drives
4594 * may use blocks less than 512 bytes this gives the raw byte count of
4595 * of data read from the tape drive.
4596 * @dev: struct device
4597 * @attr: attribute structure
4598 * @buf: buffer to return formatted data in
4599 */
4600 static ssize_t read_byte_cnt_show(struct device *dev,
4601 struct device_attribute *attr, char *buf)
4602 {
4603 struct st_modedef *STm = dev_get_drvdata(dev);
4604
4605 return sprintf(buf, "%lld",
4606 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4607 }
4608 static DEVICE_ATTR_RO(read_byte_cnt);
4609
4610 /**
4611 * read_us_show - return read us - overall time spent waiting on reads in ns.
4612 * @dev: struct device
4613 * @attr: attribute structure
4614 * @buf: buffer to return formatted data in
4615 */
4616 static ssize_t read_ns_show(struct device *dev,
4617 struct device_attribute *attr, char *buf)
4618 {
4619 struct st_modedef *STm = dev_get_drvdata(dev);
4620
4621 return sprintf(buf, "%lld",
4622 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4623 }
4624 static DEVICE_ATTR_RO(read_ns);
4625
4626 /**
4627 * write_cnt_show - write count - number of user calls
4628 * to write(2) that have written data to tape.
4629 * @dev: struct device
4630 * @attr: attribute structure
4631 * @buf: buffer to return formatted data in
4632 */
4633 static ssize_t write_cnt_show(struct device *dev,
4634 struct device_attribute *attr, char *buf)
4635 {
4636 struct st_modedef *STm = dev_get_drvdata(dev);
4637
4638 return sprintf(buf, "%lld",
4639 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4640 }
4641 static DEVICE_ATTR_RO(write_cnt);
4642
4643 /**
4644 * write_byte_cnt_show - write byte count - raw count of
4645 * bytes written to tape.
4646 * @dev: struct device
4647 * @attr: attribute structure
4648 * @buf: buffer to return formatted data in
4649 */
4650 static ssize_t write_byte_cnt_show(struct device *dev,
4651 struct device_attribute *attr, char *buf)
4652 {
4653 struct st_modedef *STm = dev_get_drvdata(dev);
4654
4655 return sprintf(buf, "%lld",
4656 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4657 }
4658 static DEVICE_ATTR_RO(write_byte_cnt);
4659
4660 /**
4661 * write_ns_show - write ns - number of nanoseconds waiting on write
4662 * requests to complete.
4663 * @dev: struct device
4664 * @attr: attribute structure
4665 * @buf: buffer to return formatted data in
4666 */
4667 static ssize_t write_ns_show(struct device *dev,
4668 struct device_attribute *attr, char *buf)
4669 {
4670 struct st_modedef *STm = dev_get_drvdata(dev);
4671
4672 return sprintf(buf, "%lld",
4673 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4674 }
4675 static DEVICE_ATTR_RO(write_ns);
4676
4677 /**
4678 * in_flight_show - number of I/Os currently in flight -
4679 * in most cases this will be either 0 or 1. It may be higher if someone
4680 * has also issued other SCSI commands such as via an ioctl.
4681 * @dev: struct device
4682 * @attr: attribute structure
4683 * @buf: buffer to return formatted data in
4684 */
4685 static ssize_t in_flight_show(struct device *dev,
4686 struct device_attribute *attr, char *buf)
4687 {
4688 struct st_modedef *STm = dev_get_drvdata(dev);
4689
4690 return sprintf(buf, "%lld",
4691 (long long)atomic64_read(&STm->tape->stats->in_flight));
4692 }
4693 static DEVICE_ATTR_RO(in_flight);
4694
4695 /**
4696 * io_ns_show - io wait ns - this is the number of ns spent
4697 * waiting on all I/O to complete. This includes tape movement commands
4698 * such as rewinding, seeking to end of file or tape, it also includes
4699 * read and write. To determine the time spent on tape movement
4700 * subtract the read and write ns from this value.
4701 * @dev: struct device
4702 * @attr: attribute structure
4703 * @buf: buffer to return formatted data in
4704 */
4705 static ssize_t io_ns_show(struct device *dev,
4706 struct device_attribute *attr, char *buf)
4707 {
4708 struct st_modedef *STm = dev_get_drvdata(dev);
4709
4710 return sprintf(buf, "%lld",
4711 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4712 }
4713 static DEVICE_ATTR_RO(io_ns);
4714
4715 /**
4716 * other_cnt_show - other io count - this is the number of
4717 * I/O requests other than read and write requests.
4718 * Typically these are tape movement requests but will include driver
4719 * tape movement. This includes only requests issued by the st driver.
4720 * @dev: struct device
4721 * @attr: attribute structure
4722 * @buf: buffer to return formatted data in
4723 */
4724 static ssize_t other_cnt_show(struct device *dev,
4725 struct device_attribute *attr, char *buf)
4726 {
4727 struct st_modedef *STm = dev_get_drvdata(dev);
4728
4729 return sprintf(buf, "%lld",
4730 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4731 }
4732 static DEVICE_ATTR_RO(other_cnt);
4733
4734 /**
4735 * resid_cnt_show - A count of the number of times we get a residual
4736 * count - this should indicate someone issuing reads larger than the
4737 * block size on tape.
4738 * @dev: struct device
4739 * @attr: attribute structure
4740 * @buf: buffer to return formatted data in
4741 */
4742 static ssize_t resid_cnt_show(struct device *dev,
4743 struct device_attribute *attr, char *buf)
4744 {
4745 struct st_modedef *STm = dev_get_drvdata(dev);
4746
4747 return sprintf(buf, "%lld",
4748 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4749 }
4750 static DEVICE_ATTR_RO(resid_cnt);
4751
4752 static struct attribute *st_dev_attrs[] = {
4753 &dev_attr_defined.attr,
4754 &dev_attr_default_blksize.attr,
4755 &dev_attr_default_density.attr,
4756 &dev_attr_default_compression.attr,
4757 &dev_attr_options.attr,
4758 NULL,
4759 };
4760
4761 static struct attribute *st_stats_attrs[] = {
4762 &dev_attr_read_cnt.attr,
4763 &dev_attr_read_byte_cnt.attr,
4764 &dev_attr_read_ns.attr,
4765 &dev_attr_write_cnt.attr,
4766 &dev_attr_write_byte_cnt.attr,
4767 &dev_attr_write_ns.attr,
4768 &dev_attr_in_flight.attr,
4769 &dev_attr_io_ns.attr,
4770 &dev_attr_other_cnt.attr,
4771 &dev_attr_resid_cnt.attr,
4772 NULL,
4773 };
4774
4775 static struct attribute_group stats_group = {
4776 .name = "stats",
4777 .attrs = st_stats_attrs,
4778 };
4779
4780 static struct attribute_group st_group = {
4781 .attrs = st_dev_attrs,
4782 };
4783
4784 static const struct attribute_group *st_dev_groups[] = {
4785 &st_group,
4786 &stats_group,
4787 NULL,
4788 };
4789
4790 /* The following functions may be useful for a larger audience. */
4791 static int sgl_map_user_pages(struct st_buffer *STbp,
4792 const unsigned int max_pages, unsigned long uaddr,
4793 size_t count, int rw)
4794 {
4795 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4796 unsigned long start = uaddr >> PAGE_SHIFT;
4797 const int nr_pages = end - start;
4798 int res, i, j;
4799 struct page **pages;
4800 struct rq_map_data *mdata = &STbp->map_data;
4801
4802 /* User attempted Overflow! */
4803 if ((uaddr + count) < uaddr)
4804 return -EINVAL;
4805
4806 /* Too big */
4807 if (nr_pages > max_pages)
4808 return -ENOMEM;
4809
4810 /* Hmm? */
4811 if (count == 0)
4812 return 0;
4813
4814 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4815 return -ENOMEM;
4816
4817 /* Try to fault in all of the necessary pages */
4818 /* rw==READ means read from drive, write into memory area */
4819 res = get_user_pages_unlocked(
4820 uaddr,
4821 nr_pages,
4822 rw == READ,
4823 0, /* don't force */
4824 pages);
4825
4826 /* Errors and no page mapped should return here */
4827 if (res < nr_pages)
4828 goto out_unmap;
4829
4830 for (i=0; i < nr_pages; i++) {
4831 /* FIXME: flush superflous for rw==READ,
4832 * probably wrong function for rw==WRITE
4833 */
4834 flush_dcache_page(pages[i]);
4835 }
4836
4837 mdata->offset = uaddr & ~PAGE_MASK;
4838 STbp->mapped_pages = pages;
4839
4840 return nr_pages;
4841 out_unmap:
4842 if (res > 0) {
4843 for (j=0; j < res; j++)
4844 page_cache_release(pages[j]);
4845 res = 0;
4846 }
4847 kfree(pages);
4848 return res;
4849 }
4850
4851
4852 /* And unmap them... */
4853 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4854 const unsigned int nr_pages, int dirtied)
4855 {
4856 int i;
4857
4858 for (i=0; i < nr_pages; i++) {
4859 struct page *page = STbp->mapped_pages[i];
4860
4861 if (dirtied)
4862 SetPageDirty(page);
4863 /* FIXME: cache flush missing for rw==READ
4864 * FIXME: call the correct reference counting function
4865 */
4866 page_cache_release(page);
4867 }
4868 kfree(STbp->mapped_pages);
4869 STbp->mapped_pages = NULL;
4870
4871 return 0;
4872 }
Linux kernel - Deliverables
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