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fed up with those stupid warnings
[mmotm.git] / drivers / scsi / st.c
blobad59abb4772234cb2ef6eb6dbc2ee8882b49af09
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 - 2008 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 = "20081215";
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/errno.h>
31 #include <linux/mtio.h>
32 #include <linux/cdrom.h>
33 #include <linux/ioctl.h>
34 #include <linux/fcntl.h>
35 #include <linux/spinlock.h>
36 #include <linux/blkdev.h>
37 #include <linux/moduleparam.h>
38 #include <linux/cdev.h>
39 #include <linux/delay.h>
40 #include <linux/mutex.h>
41 #include <linux/smp_lock.h>
42
43 #include <asm/uaccess.h>
44 #include <asm/dma.h>
45 #include <asm/system.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 0
60
61 #if DEBUG
62 /* The message level for the debug messages is currently set to KERN_NOTICE
63 so that people can easily see the messages. Later when the debugging messages
64 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
65 #define ST_DEB_MSG KERN_NOTICE
66 #define DEB(a) a
67 #define DEBC(a) if (debugging) { a ; }
68 #else
69 #define DEB(a)
70 #define DEBC(a)
71 #endif
72
73 #define ST_KILOBYTE 1024
74
75 #include "st_options.h"
76 #include "st.h"
77
78 static int buffer_kbs;
79 static int max_sg_segs;
80 static int try_direct_io = TRY_DIRECT_IO;
81 static int try_rdio = 1;
82 static int try_wdio = 1;
83
84 static int st_dev_max;
85 static int st_nr_dev;
86
87 static struct class *st_sysfs_class;
88
89 MODULE_AUTHOR("Kai Makisara");
90 MODULE_DESCRIPTION("SCSI tape (st) driver");
91 MODULE_LICENSE("GPL");
92 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
94
95 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
96 * of sysfs parameters (which module_param doesn't yet support).
97 * Sysfs parameters defined explicitly later.
98 */
99 module_param_named(buffer_kbs, buffer_kbs, int, 0);
100 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
101 module_param_named(max_sg_segs, max_sg_segs, int, 0);
102 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
103 module_param_named(try_direct_io, try_direct_io, int, 0);
104 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
105
106 /* Extra parameters for testing */
107 module_param_named(try_rdio, try_rdio, int, 0);
108 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
109 module_param_named(try_wdio, try_wdio, int, 0);
110 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
111
112 #ifndef MODULE
113 static int write_threshold_kbs; /* retained for compatibility */
114 static struct st_dev_parm {
115 char *name;
116 int *val;
117 } parms[] __initdata = {
118 {
119 "buffer_kbs", &buffer_kbs
120 },
121 { /* Retained for compatibility with 2.4 */
122 "write_threshold_kbs", &write_threshold_kbs
123 },
124 {
125 "max_sg_segs", NULL
126 },
127 {
128 "try_direct_io", &try_direct_io
129 }
130 };
131 #endif
132
133 /* Restrict the number of modes so that names for all are assigned */
134 #if ST_NBR_MODES > 16
135 #error "Maximum number of modes is 16"
136 #endif
137 /* Bit reversed order to get same names for same minors with all
138 mode counts */
139 static const char *st_formats[] = {
140 "", "r", "k", "s", "l", "t", "o", "u",
141 "m", "v", "p", "x", "a", "y", "q", "z"};
142
143 /* The default definitions have been moved to st_options.h */
144
145 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
146
147 /* The buffer size should fit into the 24 bits for length in the
148 6-byte SCSI read and write commands. */
149 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
150 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
151 #endif
152
153 static int debugging = DEBUG;
154
155 #define MAX_RETRIES 0
156 #define MAX_WRITE_RETRIES 0
157 #define MAX_READY_RETRIES 0
158 #define NO_TAPE NOT_READY
159
160 #define ST_TIMEOUT (900 * HZ)
161 #define ST_LONG_TIMEOUT (14000 * HZ)
162
163 /* Remove mode bits and auto-rewind bit (7) */
164 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
165 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
166 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
167
168 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
169 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
170 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
171
172 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
173 24 bits) */
174 #define SET_DENS_AND_BLK 0x10001
175
176 static DEFINE_RWLOCK(st_dev_arr_lock);
177
178 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
179 static int st_max_sg_segs = ST_MAX_SG;
180
181 static struct scsi_tape **scsi_tapes = NULL;
182
183 static int modes_defined;
184
185 static int enlarge_buffer(struct st_buffer *, int, int);
186 static void clear_buffer(struct st_buffer *);
187 static void normalize_buffer(struct st_buffer *);
188 static int append_to_buffer(const char __user *, struct st_buffer *, int);
189 static int from_buffer(struct st_buffer *, char __user *, int);
190 static void move_buffer_data(struct st_buffer *, int);
191
192 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
193 unsigned long, size_t, int);
194 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
195
196 static int st_probe(struct device *);
197 static int st_remove(struct device *);
198
199 static int do_create_sysfs_files(void);
200 static void do_remove_sysfs_files(void);
201 static int do_create_class_files(struct scsi_tape *, int, int);
202
203 static struct scsi_driver st_template = {
204 .owner = THIS_MODULE,
205 .gendrv = {
206 .name = "st",
207 .probe = st_probe,
208 .remove = st_remove,
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
225 \f
226 #include "osst_detect.h"
227 #ifndef SIGS_FROM_OSST
228 #define SIGS_FROM_OSST \
229 {"OnStream", "SC-", "", "osst"}, \
230 {"OnStream", "DI-", "", "osst"}, \
231 {"OnStream", "DP-", "", "osst"}, \
232 {"OnStream", "USB", "", "osst"}, \
233 {"OnStream", "FW-", "", "osst"}
234 #endif
235
236 static struct scsi_tape *scsi_tape_get(int dev)
237 {
238 struct scsi_tape *STp = NULL;
239
240 mutex_lock(&st_ref_mutex);
241 write_lock(&st_dev_arr_lock);
242
243 if (dev < st_dev_max && scsi_tapes != NULL)
244 STp = scsi_tapes[dev];
245 if (!STp) goto out;
246
247 kref_get(&STp->kref);
248
249 if (!STp->device)
250 goto out_put;
251
252 if (scsi_device_get(STp->device))
253 goto out_put;
254
255 goto out;
256
257 out_put:
258 kref_put(&STp->kref, scsi_tape_release);
259 STp = NULL;
260 out:
261 write_unlock(&st_dev_arr_lock);
262 mutex_unlock(&st_ref_mutex);
263 return STp;
264 }
265
266 static void scsi_tape_put(struct scsi_tape *STp)
267 {
268 struct scsi_device *sdev = STp->device;
269
270 mutex_lock(&st_ref_mutex);
271 kref_put(&STp->kref, scsi_tape_release);
272 scsi_device_put(sdev);
273 mutex_unlock(&st_ref_mutex);
274 }
275
276 struct st_reject_data {
277 char *vendor;
278 char *model;
279 char *rev;
280 char *driver_hint; /* Name of the correct driver, NULL if unknown */
281 };
282
283 static struct st_reject_data reject_list[] = {
284 /* {"XXX", "Yy-", "", NULL}, example */
285 SIGS_FROM_OSST,
286 {NULL, }};
287
288 /* If the device signature is on the list of incompatible drives, the
289 function returns a pointer to the name of the correct driver (if known) */
290 static char * st_incompatible(struct scsi_device* SDp)
291 {
292 struct st_reject_data *rp;
293
294 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
295 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
296 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
297 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
298 if (rp->driver_hint)
299 return rp->driver_hint;
300 else
301 return "unknown";
302 }
303 return NULL;
304 }
305 \f
306
307 static inline char *tape_name(struct scsi_tape *tape)
308 {
309 return tape->disk->disk_name;
310 }
311
312
313 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
314 {
315 const u8 *ucp;
316 const u8 *sense = SRpnt->sense;
317
318 s->have_sense = scsi_normalize_sense(SRpnt->sense,
319 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
320 s->flags = 0;
321
322 if (s->have_sense) {
323 s->deferred = 0;
324 s->remainder_valid =
325 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
326 switch (sense[0] & 0x7f) {
327 case 0x71:
328 s->deferred = 1;
329 case 0x70:
330 s->fixed_format = 1;
331 s->flags = sense[2] & 0xe0;
332 break;
333 case 0x73:
334 s->deferred = 1;
335 case 0x72:
336 s->fixed_format = 0;
337 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
338 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
339 break;
340 }
341 }
342 }
343
344
345 /* Convert the result to success code */
346 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
347 {
348 int result = SRpnt->result;
349 u8 scode;
350 DEB(const char *stp;)
351 char *name = tape_name(STp);
352 struct st_cmdstatus *cmdstatp;
353
354 if (!result)
355 return 0;
356
357 cmdstatp = &STp->buffer->cmdstat;
358 st_analyze_sense(SRpnt, cmdstatp);
359
360 if (cmdstatp->have_sense)
361 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
362 else
363 scode = 0;
364
365 DEB(
366 if (debugging) {
367 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
368 name, result,
369 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
370 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
371 if (cmdstatp->have_sense)
372 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
373 } ) /* end DEB */
374 if (!debugging) { /* Abnormal conditions for tape */
375 if (!cmdstatp->have_sense)
376 printk(KERN_WARNING
377 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
378 name, result, driver_byte(result),
379 host_byte(result));
380 else if (cmdstatp->have_sense &&
381 scode != NO_SENSE &&
382 scode != RECOVERED_ERROR &&
383 /* scode != UNIT_ATTENTION && */
384 scode != BLANK_CHECK &&
385 scode != VOLUME_OVERFLOW &&
386 SRpnt->cmd[0] != MODE_SENSE &&
387 SRpnt->cmd[0] != TEST_UNIT_READY) {
388
389 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
390 }
391 }
392
393 if (cmdstatp->fixed_format &&
394 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
395 if (STp->cln_sense_value)
396 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
397 STp->cln_sense_mask) == STp->cln_sense_value);
398 else
399 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
400 STp->cln_sense_mask) != 0);
401 }
402 if (cmdstatp->have_sense &&
403 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
404 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
405
406 STp->pos_unknown |= STp->device->was_reset;
407
408 if (cmdstatp->have_sense &&
409 scode == RECOVERED_ERROR
410 #if ST_RECOVERED_WRITE_FATAL
411 && SRpnt->cmd[0] != WRITE_6
412 && SRpnt->cmd[0] != WRITE_FILEMARKS
413 #endif
414 ) {
415 STp->recover_count++;
416 STp->recover_reg++;
417
418 DEB(
419 if (debugging) {
420 if (SRpnt->cmd[0] == READ_6)
421 stp = "read";
422 else if (SRpnt->cmd[0] == WRITE_6)
423 stp = "write";
424 else
425 stp = "ioctl";
426 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
427 STp->recover_count);
428 } ) /* end DEB */
429
430 if (cmdstatp->flags == 0)
431 return 0;
432 }
433 return (-EIO);
434 }
435
436 static struct st_request *st_allocate_request(struct scsi_tape *stp)
437 {
438 struct st_request *streq;
439
440 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
441 if (streq)
442 streq->stp = stp;
443 else {
444 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
445 tape_name(stp)););
446 if (signal_pending(current))
447 stp->buffer->syscall_result = -EINTR;
448 else
449 stp->buffer->syscall_result = -EBUSY;
450 }
451
452 return streq;
453 }
454
455 static void st_release_request(struct st_request *streq)
456 {
457 kfree(streq);
458 }
459
460 static void st_scsi_execute_end(struct request *req, int uptodate)
461 {
462 struct st_request *SRpnt = req->end_io_data;
463 struct scsi_tape *STp = SRpnt->stp;
464
465 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
466 STp->buffer->cmdstat.residual = req->resid_len;
467
468 if (SRpnt->waiting)
469 complete(SRpnt->waiting);
470
471 blk_rq_unmap_user(SRpnt->bio);
472 __blk_put_request(req->q, req);
473 }
474
475 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
476 int data_direction, void *buffer, unsigned bufflen,
477 int timeout, int retries)
478 {
479 struct request *req;
480 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
481 int err = 0;
482 int write = (data_direction == DMA_TO_DEVICE);
483
484 req = blk_get_request(SRpnt->stp->device->request_queue, write,
485 GFP_KERNEL);
486 if (!req)
487 return DRIVER_ERROR << 24;
488
489 req->cmd_type = REQ_TYPE_BLOCK_PC;
490 req->cmd_flags |= REQ_QUIET;
491
492 mdata->null_mapped = 1;
493
494 if (bufflen) {
495 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
496 GFP_KERNEL);
497 if (err) {
498 blk_put_request(req);
499 return DRIVER_ERROR << 24;
500 }
501 }
502
503 SRpnt->bio = req->bio;
504 req->cmd_len = COMMAND_SIZE(cmd[0]);
505 memset(req->cmd, 0, BLK_MAX_CDB);
506 memcpy(req->cmd, cmd, req->cmd_len);
507 req->sense = SRpnt->sense;
508 req->sense_len = 0;
509 req->timeout = timeout;
510 req->retries = retries;
511 req->end_io_data = SRpnt;
512
513 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
514 return 0;
515 }
516
517 /* Do the scsi command. Waits until command performed if do_wait is true.
518 Otherwise write_behind_check() is used to check that the command
519 has finished. */
520 static struct st_request *
521 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
522 int bytes, int direction, int timeout, int retries, int do_wait)
523 {
524 struct completion *waiting;
525 struct rq_map_data *mdata = &STp->buffer->map_data;
526 int ret;
527
528 /* if async, make sure there's no command outstanding */
529 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
530 printk(KERN_ERR "%s: Async command already active.\n",
531 tape_name(STp));
532 if (signal_pending(current))
533 (STp->buffer)->syscall_result = (-EINTR);
534 else
535 (STp->buffer)->syscall_result = (-EBUSY);
536 return NULL;
537 }
538
539 if (!SRpnt) {
540 SRpnt = st_allocate_request(STp);
541 if (!SRpnt)
542 return NULL;
543 }
544
545 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
546 which IO is outstanding. It's nulled out when the IO completes. */
547 if (!do_wait)
548 (STp->buffer)->last_SRpnt = SRpnt;
549
550 waiting = &STp->wait;
551 init_completion(waiting);
552 SRpnt->waiting = waiting;
553
554 if (STp->buffer->do_dio) {
555 mdata->nr_entries = STp->buffer->sg_segs;
556 mdata->pages = STp->buffer->mapped_pages;
557 } else {
558 mdata->nr_entries =
559 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
560 STp->buffer->map_data.pages = STp->buffer->reserved_pages;
561 STp->buffer->map_data.offset = 0;
562 }
563
564 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
565 STp->buffer->cmdstat.have_sense = 0;
566 STp->buffer->syscall_result = 0;
567
568 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
569 retries);
570 if (ret) {
571 /* could not allocate the buffer or request was too large */
572 (STp->buffer)->syscall_result = (-EBUSY);
573 (STp->buffer)->last_SRpnt = NULL;
574 } else if (do_wait) {
575 wait_for_completion(waiting);
576 SRpnt->waiting = NULL;
577 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
578 }
579
580 return SRpnt;
581 }
582
583
584 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
585 write has been correct but EOM early warning reached, -EIO if write ended in
586 error or zero if write successful. Asynchronous writes are used only in
587 variable block mode. */
588 static int write_behind_check(struct scsi_tape * STp)
589 {
590 int retval = 0;
591 struct st_buffer *STbuffer;
592 struct st_partstat *STps;
593 struct st_cmdstatus *cmdstatp;
594 struct st_request *SRpnt;
595
596 STbuffer = STp->buffer;
597 if (!STbuffer->writing)
598 return 0;
599
600 DEB(
601 if (STp->write_pending)
602 STp->nbr_waits++;
603 else
604 STp->nbr_finished++;
605 ) /* end DEB */
606
607 wait_for_completion(&(STp->wait));
608 SRpnt = STbuffer->last_SRpnt;
609 STbuffer->last_SRpnt = NULL;
610 SRpnt->waiting = NULL;
611
612 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
613 st_release_request(SRpnt);
614
615 STbuffer->buffer_bytes -= STbuffer->writing;
616 STps = &(STp->ps[STp->partition]);
617 if (STps->drv_block >= 0) {
618 if (STp->block_size == 0)
619 STps->drv_block++;
620 else
621 STps->drv_block += STbuffer->writing / STp->block_size;
622 }
623
624 cmdstatp = &STbuffer->cmdstat;
625 if (STbuffer->syscall_result) {
626 retval = -EIO;
627 if (cmdstatp->have_sense && !cmdstatp->deferred &&
628 (cmdstatp->flags & SENSE_EOM) &&
629 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
630 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
631 /* EOM at write-behind, has all data been written? */
632 if (!cmdstatp->remainder_valid ||
633 cmdstatp->uremainder64 == 0)
634 retval = -ENOSPC;
635 }
636 if (retval == -EIO)
637 STps->drv_block = -1;
638 }
639 STbuffer->writing = 0;
640
641 DEB(if (debugging && retval)
642 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
643 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
644
645 return retval;
646 }
647
648
649 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
650 it messes up the block number). */
651 static int cross_eof(struct scsi_tape * STp, int forward)
652 {
653 struct st_request *SRpnt;
654 unsigned char cmd[MAX_COMMAND_SIZE];
655
656 cmd[0] = SPACE;
657 cmd[1] = 0x01; /* Space FileMarks */
658 if (forward) {
659 cmd[2] = cmd[3] = 0;
660 cmd[4] = 1;
661 } else
662 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
663 cmd[5] = 0;
664
665 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
666 tape_name(STp), forward ? "forward" : "backward"));
667
668 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
669 STp->device->request_queue->rq_timeout,
670 MAX_RETRIES, 1);
671 if (!SRpnt)
672 return (STp->buffer)->syscall_result;
673
674 st_release_request(SRpnt);
675 SRpnt = NULL;
676
677 if ((STp->buffer)->cmdstat.midlevel_result != 0)
678 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
679 tape_name(STp), forward ? "forward" : "backward");
680
681 return (STp->buffer)->syscall_result;
682 }
683
684
685 /* Flush the write buffer (never need to write if variable blocksize). */
686 static int st_flush_write_buffer(struct scsi_tape * STp)
687 {
688 int transfer, blks;
689 int result;
690 unsigned char cmd[MAX_COMMAND_SIZE];
691 struct st_request *SRpnt;
692 struct st_partstat *STps;
693
694 result = write_behind_check(STp);
695 if (result)
696 return result;
697
698 result = 0;
699 if (STp->dirty == 1) {
700
701 transfer = STp->buffer->buffer_bytes;
702 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
703 tape_name(STp), transfer));
704
705 memset(cmd, 0, MAX_COMMAND_SIZE);
706 cmd[0] = WRITE_6;
707 cmd[1] = 1;
708 blks = transfer / STp->block_size;
709 cmd[2] = blks >> 16;
710 cmd[3] = blks >> 8;
711 cmd[4] = blks;
712
713 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
714 STp->device->request_queue->rq_timeout,
715 MAX_WRITE_RETRIES, 1);
716 if (!SRpnt)
717 return (STp->buffer)->syscall_result;
718
719 STps = &(STp->ps[STp->partition]);
720 if ((STp->buffer)->syscall_result != 0) {
721 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
722
723 if (cmdstatp->have_sense && !cmdstatp->deferred &&
724 (cmdstatp->flags & SENSE_EOM) &&
725 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
726 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
727 (!cmdstatp->remainder_valid ||
728 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
729 STp->dirty = 0;
730 (STp->buffer)->buffer_bytes = 0;
731 if (STps->drv_block >= 0)
732 STps->drv_block += blks;
733 result = (-ENOSPC);
734 } else {
735 printk(KERN_ERR "%s: Error on flush.\n",
736 tape_name(STp));
737 STps->drv_block = (-1);
738 result = (-EIO);
739 }
740 } else {
741 if (STps->drv_block >= 0)
742 STps->drv_block += blks;
743 STp->dirty = 0;
744 (STp->buffer)->buffer_bytes = 0;
745 }
746 st_release_request(SRpnt);
747 SRpnt = NULL;
748 }
749 return result;
750 }
751
752
753 /* Flush the tape buffer. The tape will be positioned correctly unless
754 seek_next is true. */
755 static int flush_buffer(struct scsi_tape *STp, int seek_next)
756 {
757 int backspace, result;
758 struct st_buffer *STbuffer;
759 struct st_partstat *STps;
760
761 STbuffer = STp->buffer;
762
763 /*
764 * If there was a bus reset, block further access
765 * to this device.
766 */
767 if (STp->pos_unknown)
768 return (-EIO);
769
770 if (STp->ready != ST_READY)
771 return 0;
772 STps = &(STp->ps[STp->partition]);
773 if (STps->rw == ST_WRITING) /* Writing */
774 return st_flush_write_buffer(STp);
775
776 if (STp->block_size == 0)
777 return 0;
778
779 backspace = ((STp->buffer)->buffer_bytes +
780 (STp->buffer)->read_pointer) / STp->block_size -
781 ((STp->buffer)->read_pointer + STp->block_size - 1) /
782 STp->block_size;
783 (STp->buffer)->buffer_bytes = 0;
784 (STp->buffer)->read_pointer = 0;
785 result = 0;
786 if (!seek_next) {
787 if (STps->eof == ST_FM_HIT) {
788 result = cross_eof(STp, 0); /* Back over the EOF hit */
789 if (!result)
790 STps->eof = ST_NOEOF;
791 else {
792 if (STps->drv_file >= 0)
793 STps->drv_file++;
794 STps->drv_block = 0;
795 }
796 }
797 if (!result && backspace > 0)
798 result = st_int_ioctl(STp, MTBSR, backspace);
799 } else if (STps->eof == ST_FM_HIT) {
800 if (STps->drv_file >= 0)
801 STps->drv_file++;
802 STps->drv_block = 0;
803 STps->eof = ST_NOEOF;
804 }
805 return result;
806
807 }
808 \f
809 /* Set the mode parameters */
810 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
811 {
812 int set_it = 0;
813 unsigned long arg;
814 char *name = tape_name(STp);
815
816 if (!STp->density_changed &&
817 STm->default_density >= 0 &&
818 STm->default_density != STp->density) {
819 arg = STm->default_density;
820 set_it = 1;
821 } else
822 arg = STp->density;
823 arg <<= MT_ST_DENSITY_SHIFT;
824 if (!STp->blksize_changed &&
825 STm->default_blksize >= 0 &&
826 STm->default_blksize != STp->block_size) {
827 arg |= STm->default_blksize;
828 set_it = 1;
829 } else
830 arg |= STp->block_size;
831 if (set_it &&
832 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
833 printk(KERN_WARNING
834 "%s: Can't set default block size to %d bytes and density %x.\n",
835 name, STm->default_blksize, STm->default_density);
836 if (modes_defined)
837 return (-EINVAL);
838 }
839 return 0;
840 }
841
842
843 /* Lock or unlock the drive door. Don't use when st_request allocated. */
844 static int do_door_lock(struct scsi_tape * STp, int do_lock)
845 {
846 int retval, cmd;
847 DEB(char *name = tape_name(STp);)
848
849
850 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
851 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
852 do_lock ? "L" : "Unl"));
853 retval = scsi_ioctl(STp->device, cmd, NULL);
854 if (!retval) {
855 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
856 }
857 else {
858 STp->door_locked = ST_LOCK_FAILS;
859 }
860 return retval;
861 }
862
863
864 /* Set the internal state after reset */
865 static void reset_state(struct scsi_tape *STp)
866 {
867 int i;
868 struct st_partstat *STps;
869
870 STp->pos_unknown = 0;
871 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
872 STps = &(STp->ps[i]);
873 STps->rw = ST_IDLE;
874 STps->eof = ST_NOEOF;
875 STps->at_sm = 0;
876 STps->last_block_valid = 0;
877 STps->drv_block = -1;
878 STps->drv_file = -1;
879 }
880 if (STp->can_partitions) {
881 STp->partition = find_partition(STp);
882 if (STp->partition < 0)
883 STp->partition = 0;
884 STp->new_partition = STp->partition;
885 }
886 }
887 \f
888 /* Test if the drive is ready. Returns either one of the codes below or a negative system
889 error code. */
890 #define CHKRES_READY 0
891 #define CHKRES_NEW_SESSION 1
892 #define CHKRES_NOT_READY 2
893 #define CHKRES_NO_TAPE 3
894
895 #define MAX_ATTENTIONS 10
896
897 static int test_ready(struct scsi_tape *STp, int do_wait)
898 {
899 int attentions, waits, max_wait, scode;
900 int retval = CHKRES_READY, new_session = 0;
901 unsigned char cmd[MAX_COMMAND_SIZE];
902 struct st_request *SRpnt = NULL;
903 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
904
905 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
906
907 for (attentions=waits=0; ; ) {
908 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
909 cmd[0] = TEST_UNIT_READY;
910 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
911 STp->long_timeout, MAX_READY_RETRIES, 1);
912
913 if (!SRpnt) {
914 retval = (STp->buffer)->syscall_result;
915 break;
916 }
917
918 if (cmdstatp->have_sense) {
919
920 scode = cmdstatp->sense_hdr.sense_key;
921
922 if (scode == UNIT_ATTENTION) { /* New media? */
923 new_session = 1;
924 if (attentions < MAX_ATTENTIONS) {
925 attentions++;
926 continue;
927 }
928 else {
929 retval = (-EIO);
930 break;
931 }
932 }
933
934 if (scode == NOT_READY) {
935 if (waits < max_wait) {
936 if (msleep_interruptible(1000)) {
937 retval = (-EINTR);
938 break;
939 }
940 waits++;
941 continue;
942 }
943 else {
944 if ((STp->device)->scsi_level >= SCSI_2 &&
945 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
946 retval = CHKRES_NO_TAPE;
947 else
948 retval = CHKRES_NOT_READY;
949 break;
950 }
951 }
952 }
953
954 retval = (STp->buffer)->syscall_result;
955 if (!retval)
956 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
957 break;
958 }
959
960 if (SRpnt != NULL)
961 st_release_request(SRpnt);
962 return retval;
963 }
964
965
966 /* See if the drive is ready and gather information about the tape. Return values:
967 < 0 negative error code from errno.h
968 0 drive ready
969 1 drive not ready (possibly no tape)
970 */
971 static int check_tape(struct scsi_tape *STp, struct file *filp)
972 {
973 int i, retval, new_session = 0, do_wait;
974 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
975 unsigned short st_flags = filp->f_flags;
976 struct st_request *SRpnt = NULL;
977 struct st_modedef *STm;
978 struct st_partstat *STps;
979 char *name = tape_name(STp);
980 struct inode *inode = filp->f_path.dentry->d_inode;
981 int mode = TAPE_MODE(inode);
982
983 STp->ready = ST_READY;
984
985 if (mode != STp->current_mode) {
986 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
987 name, STp->current_mode, mode));
988 new_session = 1;
989 STp->current_mode = mode;
990 }
991 STm = &(STp->modes[STp->current_mode]);
992
993 saved_cleaning = STp->cleaning_req;
994 STp->cleaning_req = 0;
995
996 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
997 retval = test_ready(STp, do_wait);
998
999 if (retval < 0)
1000 goto err_out;
1001
1002 if (retval == CHKRES_NEW_SESSION) {
1003 STp->pos_unknown = 0;
1004 STp->partition = STp->new_partition = 0;
1005 if (STp->can_partitions)
1006 STp->nbr_partitions = 1; /* This guess will be updated later
1007 if necessary */
1008 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1009 STps = &(STp->ps[i]);
1010 STps->rw = ST_IDLE;
1011 STps->eof = ST_NOEOF;
1012 STps->at_sm = 0;
1013 STps->last_block_valid = 0;
1014 STps->drv_block = 0;
1015 STps->drv_file = 0;
1016 }
1017 new_session = 1;
1018 }
1019 else {
1020 STp->cleaning_req |= saved_cleaning;
1021
1022 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1023 if (retval == CHKRES_NO_TAPE)
1024 STp->ready = ST_NO_TAPE;
1025 else
1026 STp->ready = ST_NOT_READY;
1027
1028 STp->density = 0; /* Clear the erroneous "residue" */
1029 STp->write_prot = 0;
1030 STp->block_size = 0;
1031 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1032 STp->partition = STp->new_partition = 0;
1033 STp->door_locked = ST_UNLOCKED;
1034 return CHKRES_NOT_READY;
1035 }
1036 }
1037
1038 if (STp->omit_blklims)
1039 STp->min_block = STp->max_block = (-1);
1040 else {
1041 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1042 cmd[0] = READ_BLOCK_LIMITS;
1043
1044 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1045 STp->device->request_queue->rq_timeout,
1046 MAX_READY_RETRIES, 1);
1047 if (!SRpnt) {
1048 retval = (STp->buffer)->syscall_result;
1049 goto err_out;
1050 }
1051
1052 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1053 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1054 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1055 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1056 (STp->buffer)->b_data[5];
1057 if ( DEB( debugging || ) !STp->inited)
1058 printk(KERN_INFO
1059 "%s: Block limits %d - %d bytes.\n", name,
1060 STp->min_block, STp->max_block);
1061 } else {
1062 STp->min_block = STp->max_block = (-1);
1063 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1064 name));
1065 }
1066 }
1067
1068 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1069 cmd[0] = MODE_SENSE;
1070 cmd[4] = 12;
1071
1072 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1073 STp->device->request_queue->rq_timeout,
1074 MAX_READY_RETRIES, 1);
1075 if (!SRpnt) {
1076 retval = (STp->buffer)->syscall_result;
1077 goto err_out;
1078 }
1079
1080 if ((STp->buffer)->syscall_result != 0) {
1081 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1082 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1083 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1084 STp->drv_write_prot = 0;
1085 } else {
1086 DEBC(printk(ST_DEB_MSG
1087 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1088 name,
1089 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1090 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1091
1092 if ((STp->buffer)->b_data[3] >= 8) {
1093 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1094 STp->density = (STp->buffer)->b_data[4];
1095 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1096 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1097 DEBC(printk(ST_DEB_MSG
1098 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1099 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1100 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1101 STp->drv_buffer));
1102 }
1103 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1104 }
1105 st_release_request(SRpnt);
1106 SRpnt = NULL;
1107 STp->inited = 1;
1108
1109 if (STp->block_size > 0)
1110 (STp->buffer)->buffer_blocks =
1111 (STp->buffer)->buffer_size / STp->block_size;
1112 else
1113 (STp->buffer)->buffer_blocks = 1;
1114 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1115
1116 DEBC(printk(ST_DEB_MSG
1117 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1118 STp->block_size, (STp->buffer)->buffer_size,
1119 (STp->buffer)->buffer_blocks));
1120
1121 if (STp->drv_write_prot) {
1122 STp->write_prot = 1;
1123
1124 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1125
1126 if (do_wait &&
1127 ((st_flags & O_ACCMODE) == O_WRONLY ||
1128 (st_flags & O_ACCMODE) == O_RDWR)) {
1129 retval = (-EROFS);
1130 goto err_out;
1131 }
1132 }
1133
1134 if (STp->can_partitions && STp->nbr_partitions < 1) {
1135 /* This code is reached when the device is opened for the first time
1136 after the driver has been initialized with tape in the drive and the
1137 partition support has been enabled. */
1138 DEBC(printk(ST_DEB_MSG
1139 "%s: Updating partition number in status.\n", name));
1140 if ((STp->partition = find_partition(STp)) < 0) {
1141 retval = STp->partition;
1142 goto err_out;
1143 }
1144 STp->new_partition = STp->partition;
1145 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1146 }
1147
1148 if (new_session) { /* Change the drive parameters for the new mode */
1149 STp->density_changed = STp->blksize_changed = 0;
1150 STp->compression_changed = 0;
1151 if (!(STm->defaults_for_writes) &&
1152 (retval = set_mode_densblk(STp, STm)) < 0)
1153 goto err_out;
1154
1155 if (STp->default_drvbuffer != 0xff) {
1156 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1157 printk(KERN_WARNING
1158 "%s: Can't set default drive buffering to %d.\n",
1159 name, STp->default_drvbuffer);
1160 }
1161 }
1162
1163 return CHKRES_READY;
1164
1165 err_out:
1166 return retval;
1167 }
1168
1169
1170 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1171 module count. */
1172 static int st_open(struct inode *inode, struct file *filp)
1173 {
1174 int i, retval = (-EIO);
1175 struct scsi_tape *STp;
1176 struct st_partstat *STps;
1177 int dev = TAPE_NR(inode);
1178 char *name;
1179
1180 lock_kernel();
1181 /*
1182 * We really want to do nonseekable_open(inode, filp); here, but some
1183 * versions of tar incorrectly call lseek on tapes and bail out if that
1184 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1185 */
1186 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1187
1188 if (!(STp = scsi_tape_get(dev))) {
1189 unlock_kernel();
1190 return -ENXIO;
1191 }
1192
1193 write_lock(&st_dev_arr_lock);
1194 filp->private_data = STp;
1195 name = tape_name(STp);
1196
1197 if (STp->in_use) {
1198 write_unlock(&st_dev_arr_lock);
1199 scsi_tape_put(STp);
1200 unlock_kernel();
1201 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1202 return (-EBUSY);
1203 }
1204
1205 STp->in_use = 1;
1206 write_unlock(&st_dev_arr_lock);
1207 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1208
1209 if (!scsi_block_when_processing_errors(STp->device)) {
1210 retval = (-ENXIO);
1211 goto err_out;
1212 }
1213
1214 /* See that we have at least a one page buffer available */
1215 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1216 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1217 name);
1218 retval = (-EOVERFLOW);
1219 goto err_out;
1220 }
1221
1222 (STp->buffer)->cleared = 0;
1223 (STp->buffer)->writing = 0;
1224 (STp->buffer)->syscall_result = 0;
1225
1226 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1227
1228 STp->dirty = 0;
1229 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1230 STps = &(STp->ps[i]);
1231 STps->rw = ST_IDLE;
1232 }
1233 STp->try_dio_now = STp->try_dio;
1234 STp->recover_count = 0;
1235 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1236 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1237
1238 retval = check_tape(STp, filp);
1239 if (retval < 0)
1240 goto err_out;
1241 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1242 retval != CHKRES_READY) {
1243 if (STp->ready == NO_TAPE)
1244 retval = (-ENOMEDIUM);
1245 else
1246 retval = (-EIO);
1247 goto err_out;
1248 }
1249 unlock_kernel();
1250 return 0;
1251
1252 err_out:
1253 normalize_buffer(STp->buffer);
1254 STp->in_use = 0;
1255 scsi_tape_put(STp);
1256 unlock_kernel();
1257 return retval;
1258
1259 }
1260 \f
1261
1262 /* Flush the tape buffer before close */
1263 static int st_flush(struct file *filp, fl_owner_t id)
1264 {
1265 int result = 0, result2;
1266 unsigned char cmd[MAX_COMMAND_SIZE];
1267 struct st_request *SRpnt;
1268 struct scsi_tape *STp = filp->private_data;
1269 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1270 struct st_partstat *STps = &(STp->ps[STp->partition]);
1271 char *name = tape_name(STp);
1272
1273 if (file_count(filp) > 1)
1274 return 0;
1275
1276 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1277 result = st_flush_write_buffer(STp);
1278 if (result != 0 && result != (-ENOSPC))
1279 goto out;
1280 }
1281
1282 if (STp->can_partitions &&
1283 (result2 = switch_partition(STp)) < 0) {
1284 DEBC(printk(ST_DEB_MSG
1285 "%s: switch_partition at close failed.\n", name));
1286 if (result == 0)
1287 result = result2;
1288 goto out;
1289 }
1290
1291 DEBC( if (STp->nbr_requests)
1292 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1293 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1294
1295 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1296 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1297
1298 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1299 name, STp->nbr_waits, STp->nbr_finished);
1300 )
1301
1302 memset(cmd, 0, MAX_COMMAND_SIZE);
1303 cmd[0] = WRITE_FILEMARKS;
1304 cmd[4] = 1 + STp->two_fm;
1305
1306 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1307 STp->device->request_queue->rq_timeout,
1308 MAX_WRITE_RETRIES, 1);
1309 if (!SRpnt) {
1310 result = (STp->buffer)->syscall_result;
1311 goto out;
1312 }
1313
1314 if (STp->buffer->syscall_result == 0 ||
1315 (cmdstatp->have_sense && !cmdstatp->deferred &&
1316 (cmdstatp->flags & SENSE_EOM) &&
1317 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1318 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1319 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1320 /* Write successful at EOM */
1321 st_release_request(SRpnt);
1322 SRpnt = NULL;
1323 if (STps->drv_file >= 0)
1324 STps->drv_file++;
1325 STps->drv_block = 0;
1326 if (STp->two_fm)
1327 cross_eof(STp, 0);
1328 STps->eof = ST_FM;
1329 }
1330 else { /* Write error */
1331 st_release_request(SRpnt);
1332 SRpnt = NULL;
1333 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1334 if (result == 0)
1335 result = (-EIO);
1336 }
1337
1338 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1339 name, cmd[4]));
1340 } else if (!STp->rew_at_close) {
1341 STps = &(STp->ps[STp->partition]);
1342 if (!STm->sysv || STps->rw != ST_READING) {
1343 if (STp->can_bsr)
1344 result = flush_buffer(STp, 0);
1345 else if (STps->eof == ST_FM_HIT) {
1346 result = cross_eof(STp, 0);
1347 if (result) {
1348 if (STps->drv_file >= 0)
1349 STps->drv_file++;
1350 STps->drv_block = 0;
1351 STps->eof = ST_FM;
1352 } else
1353 STps->eof = ST_NOEOF;
1354 }
1355 } else if ((STps->eof == ST_NOEOF &&
1356 !(result = cross_eof(STp, 1))) ||
1357 STps->eof == ST_FM_HIT) {
1358 if (STps->drv_file >= 0)
1359 STps->drv_file++;
1360 STps->drv_block = 0;
1361 STps->eof = ST_FM;
1362 }
1363 }
1364
1365 out:
1366 if (STp->rew_at_close) {
1367 result2 = st_int_ioctl(STp, MTREW, 1);
1368 if (result == 0)
1369 result = result2;
1370 }
1371 return result;
1372 }
1373
1374
1375 /* Close the device and release it. BKL is not needed: this is the only thread
1376 accessing this tape. */
1377 static int st_release(struct inode *inode, struct file *filp)
1378 {
1379 int result = 0;
1380 struct scsi_tape *STp = filp->private_data;
1381
1382 if (STp->door_locked == ST_LOCKED_AUTO)
1383 do_door_lock(STp, 0);
1384
1385 normalize_buffer(STp->buffer);
1386 write_lock(&st_dev_arr_lock);
1387 STp->in_use = 0;
1388 write_unlock(&st_dev_arr_lock);
1389 scsi_tape_put(STp);
1390
1391 return result;
1392 }
1393 \f
1394 /* The checks common to both reading and writing */
1395 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1396 {
1397 ssize_t retval = 0;
1398
1399 /*
1400 * If we are in the middle of error recovery, don't let anyone
1401 * else try and use this device. Also, if error recovery fails, it
1402 * may try and take the device offline, in which case all further
1403 * access to the device is prohibited.
1404 */
1405 if (!scsi_block_when_processing_errors(STp->device)) {
1406 retval = (-ENXIO);
1407 goto out;
1408 }
1409
1410 if (STp->ready != ST_READY) {
1411 if (STp->ready == ST_NO_TAPE)
1412 retval = (-ENOMEDIUM);
1413 else
1414 retval = (-EIO);
1415 goto out;
1416 }
1417
1418 if (! STp->modes[STp->current_mode].defined) {
1419 retval = (-ENXIO);
1420 goto out;
1421 }
1422
1423
1424 /*
1425 * If there was a bus reset, block further access
1426 * to this device.
1427 */
1428 if (STp->pos_unknown) {
1429 retval = (-EIO);
1430 goto out;
1431 }
1432
1433 if (count == 0)
1434 goto out;
1435
1436 DEB(
1437 if (!STp->in_use) {
1438 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1439 retval = (-EIO);
1440 goto out;
1441 } ) /* end DEB */
1442
1443 if (STp->can_partitions &&
1444 (retval = switch_partition(STp)) < 0)
1445 goto out;
1446
1447 if (STp->block_size == 0 && STp->max_block > 0 &&
1448 (count < STp->min_block || count > STp->max_block)) {
1449 retval = (-EINVAL);
1450 goto out;
1451 }
1452
1453 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1454 !do_door_lock(STp, 1))
1455 STp->door_locked = ST_LOCKED_AUTO;
1456
1457 out:
1458 return retval;
1459 }
1460
1461
1462 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1463 size_t count, int is_read)
1464 {
1465 int i, bufsize, retval = 0;
1466 struct st_buffer *STbp = STp->buffer;
1467
1468 if (is_read)
1469 i = STp->try_dio_now && try_rdio;
1470 else
1471 i = STp->try_dio_now && try_wdio;
1472
1473 if (i && ((unsigned long)buf & queue_dma_alignment(
1474 STp->device->request_queue)) == 0) {
1475 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1476 count, (is_read ? READ : WRITE));
1477 if (i > 0) {
1478 STbp->do_dio = i;
1479 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1480 }
1481 else
1482 STbp->do_dio = 0; /* fall back to buffering with any error */
1483 STbp->sg_segs = STbp->do_dio;
1484 DEB(
1485 if (STbp->do_dio) {
1486 STp->nbr_dio++;
1487 STp->nbr_pages += STbp->do_dio;
1488 }
1489 )
1490 } else
1491 STbp->do_dio = 0;
1492 DEB( STp->nbr_requests++; )
1493
1494 if (!STbp->do_dio) {
1495 if (STp->block_size)
1496 bufsize = STp->block_size > st_fixed_buffer_size ?
1497 STp->block_size : st_fixed_buffer_size;
1498 else {
1499 bufsize = count;
1500 /* Make sure that data from previous user is not leaked even if
1501 HBA does not return correct residual */
1502 if (is_read && STp->sili && !STbp->cleared)
1503 clear_buffer(STbp);
1504 }
1505
1506 if (bufsize > STbp->buffer_size &&
1507 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1508 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1509 tape_name(STp), bufsize);
1510 retval = (-EOVERFLOW);
1511 goto out;
1512 }
1513 if (STp->block_size)
1514 STbp->buffer_blocks = bufsize / STp->block_size;
1515 }
1516
1517 out:
1518 return retval;
1519 }
1520
1521
1522 /* Can be called more than once after each setup_buffer() */
1523 static void release_buffering(struct scsi_tape *STp, int is_read)
1524 {
1525 struct st_buffer *STbp;
1526
1527 STbp = STp->buffer;
1528 if (STbp->do_dio) {
1529 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1530 STbp->do_dio = 0;
1531 STbp->sg_segs = 0;
1532 }
1533 }
1534
1535
1536 /* Write command */
1537 static ssize_t
1538 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1539 {
1540 ssize_t total;
1541 ssize_t i, do_count, blks, transfer;
1542 ssize_t retval;
1543 int undone, retry_eot = 0, scode;
1544 int async_write;
1545 unsigned char cmd[MAX_COMMAND_SIZE];
1546 const char __user *b_point;
1547 struct st_request *SRpnt = NULL;
1548 struct scsi_tape *STp = filp->private_data;
1549 struct st_modedef *STm;
1550 struct st_partstat *STps;
1551 struct st_buffer *STbp;
1552 char *name = tape_name(STp);
1553
1554 if (mutex_lock_interruptible(&STp->lock))
1555 return -ERESTARTSYS;
1556
1557 retval = rw_checks(STp, filp, count);
1558 if (retval || count == 0)
1559 goto out;
1560
1561 /* Write must be integral number of blocks */
1562 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1563 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1564 name);
1565 retval = (-EINVAL);
1566 goto out;
1567 }
1568
1569 STm = &(STp->modes[STp->current_mode]);
1570 STps = &(STp->ps[STp->partition]);
1571
1572 if (STp->write_prot) {
1573 retval = (-EACCES);
1574 goto out;
1575 }
1576
1577
1578 if (STps->rw == ST_READING) {
1579 retval = flush_buffer(STp, 0);
1580 if (retval)
1581 goto out;
1582 STps->rw = ST_WRITING;
1583 } else if (STps->rw != ST_WRITING &&
1584 STps->drv_file == 0 && STps->drv_block == 0) {
1585 if ((retval = set_mode_densblk(STp, STm)) < 0)
1586 goto out;
1587 if (STm->default_compression != ST_DONT_TOUCH &&
1588 !(STp->compression_changed)) {
1589 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1590 printk(KERN_WARNING "%s: Can't set default compression.\n",
1591 name);
1592 if (modes_defined) {
1593 retval = (-EINVAL);
1594 goto out;
1595 }
1596 }
1597 }
1598 }
1599
1600 STbp = STp->buffer;
1601 i = write_behind_check(STp);
1602 if (i) {
1603 if (i == -ENOSPC)
1604 STps->eof = ST_EOM_OK;
1605 else
1606 STps->eof = ST_EOM_ERROR;
1607 }
1608
1609 if (STps->eof == ST_EOM_OK) {
1610 STps->eof = ST_EOD_1; /* allow next write */
1611 retval = (-ENOSPC);
1612 goto out;
1613 }
1614 else if (STps->eof == ST_EOM_ERROR) {
1615 retval = (-EIO);
1616 goto out;
1617 }
1618
1619 /* Check the buffer readability in cases where copy_user might catch
1620 the problems after some tape movement. */
1621 if (STp->block_size != 0 &&
1622 !STbp->do_dio &&
1623 (copy_from_user(&i, buf, 1) != 0 ||
1624 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1625 retval = (-EFAULT);
1626 goto out;
1627 }
1628
1629 retval = setup_buffering(STp, buf, count, 0);
1630 if (retval)
1631 goto out;
1632
1633 total = count;
1634
1635 memset(cmd, 0, MAX_COMMAND_SIZE);
1636 cmd[0] = WRITE_6;
1637 cmd[1] = (STp->block_size != 0);
1638
1639 STps->rw = ST_WRITING;
1640
1641 b_point = buf;
1642 while (count > 0 && !retry_eot) {
1643
1644 if (STbp->do_dio) {
1645 do_count = count;
1646 }
1647 else {
1648 if (STp->block_size == 0)
1649 do_count = count;
1650 else {
1651 do_count = STbp->buffer_blocks * STp->block_size -
1652 STbp->buffer_bytes;
1653 if (do_count > count)
1654 do_count = count;
1655 }
1656
1657 i = append_to_buffer(b_point, STbp, do_count);
1658 if (i) {
1659 retval = i;
1660 goto out;
1661 }
1662 }
1663 count -= do_count;
1664 b_point += do_count;
1665
1666 async_write = STp->block_size == 0 && !STbp->do_dio &&
1667 STm->do_async_writes && STps->eof < ST_EOM_OK;
1668
1669 if (STp->block_size != 0 && STm->do_buffer_writes &&
1670 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1671 STbp->buffer_bytes < STbp->buffer_size) {
1672 STp->dirty = 1;
1673 /* Don't write a buffer that is not full enough. */
1674 if (!async_write && count == 0)
1675 break;
1676 }
1677
1678 retry_write:
1679 if (STp->block_size == 0)
1680 blks = transfer = do_count;
1681 else {
1682 if (!STbp->do_dio)
1683 blks = STbp->buffer_bytes;
1684 else
1685 blks = do_count;
1686 blks /= STp->block_size;
1687 transfer = blks * STp->block_size;
1688 }
1689 cmd[2] = blks >> 16;
1690 cmd[3] = blks >> 8;
1691 cmd[4] = blks;
1692
1693 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1694 STp->device->request_queue->rq_timeout,
1695 MAX_WRITE_RETRIES, !async_write);
1696 if (!SRpnt) {
1697 retval = STbp->syscall_result;
1698 goto out;
1699 }
1700 if (async_write && !STbp->syscall_result) {
1701 STbp->writing = transfer;
1702 STp->dirty = !(STbp->writing ==
1703 STbp->buffer_bytes);
1704 SRpnt = NULL; /* Prevent releasing this request! */
1705 DEB( STp->write_pending = 1; )
1706 break;
1707 }
1708
1709 if (STbp->syscall_result != 0) {
1710 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1711
1712 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1713 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1714 scode = cmdstatp->sense_hdr.sense_key;
1715 if (cmdstatp->remainder_valid)
1716 undone = (int)cmdstatp->uremainder64;
1717 else if (STp->block_size == 0 &&
1718 scode == VOLUME_OVERFLOW)
1719 undone = transfer;
1720 else
1721 undone = 0;
1722 if (STp->block_size != 0)
1723 undone *= STp->block_size;
1724 if (undone <= do_count) {
1725 /* Only data from this write is not written */
1726 count += undone;
1727 b_point -= undone;
1728 do_count -= undone;
1729 if (STp->block_size)
1730 blks = (transfer - undone) / STp->block_size;
1731 STps->eof = ST_EOM_OK;
1732 /* Continue in fixed block mode if all written
1733 in this request but still something left to write
1734 (retval left to zero)
1735 */
1736 if (STp->block_size == 0 ||
1737 undone > 0 || count == 0)
1738 retval = (-ENOSPC); /* EOM within current request */
1739 DEBC(printk(ST_DEB_MSG
1740 "%s: EOM with %d bytes unwritten.\n",
1741 name, (int)count));
1742 } else {
1743 /* EOT within data buffered earlier (possible only
1744 in fixed block mode without direct i/o) */
1745 if (!retry_eot && !cmdstatp->deferred &&
1746 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1747 move_buffer_data(STp->buffer, transfer - undone);
1748 retry_eot = 1;
1749 if (STps->drv_block >= 0) {
1750 STps->drv_block += (transfer - undone) /
1751 STp->block_size;
1752 }
1753 STps->eof = ST_EOM_OK;
1754 DEBC(printk(ST_DEB_MSG
1755 "%s: Retry write of %d bytes at EOM.\n",
1756 name, STp->buffer->buffer_bytes));
1757 goto retry_write;
1758 }
1759 else {
1760 /* Either error within data buffered by driver or
1761 failed retry */
1762 count -= do_count;
1763 blks = do_count = 0;
1764 STps->eof = ST_EOM_ERROR;
1765 STps->drv_block = (-1); /* Too cautious? */
1766 retval = (-EIO); /* EOM for old data */
1767 DEBC(printk(ST_DEB_MSG
1768 "%s: EOM with lost data.\n",
1769 name));
1770 }
1771 }
1772 } else {
1773 count += do_count;
1774 STps->drv_block = (-1); /* Too cautious? */
1775 retval = STbp->syscall_result;
1776 }
1777
1778 }
1779
1780 if (STps->drv_block >= 0) {
1781 if (STp->block_size == 0)
1782 STps->drv_block += (do_count > 0);
1783 else
1784 STps->drv_block += blks;
1785 }
1786
1787 STbp->buffer_bytes = 0;
1788 STp->dirty = 0;
1789
1790 if (retval || retry_eot) {
1791 if (count < total)
1792 retval = total - count;
1793 goto out;
1794 }
1795 }
1796
1797 if (STps->eof == ST_EOD_1)
1798 STps->eof = ST_EOM_OK;
1799 else if (STps->eof != ST_EOM_OK)
1800 STps->eof = ST_NOEOF;
1801 retval = total - count;
1802
1803 out:
1804 if (SRpnt != NULL)
1805 st_release_request(SRpnt);
1806 release_buffering(STp, 0);
1807 mutex_unlock(&STp->lock);
1808
1809 return retval;
1810 }
1811 \f
1812 /* Read data from the tape. Returns zero in the normal case, one if the
1813 eof status has changed, and the negative error code in case of a
1814 fatal error. Otherwise updates the buffer and the eof state.
1815
1816 Does release user buffer mapping if it is set.
1817 */
1818 static long read_tape(struct scsi_tape *STp, long count,
1819 struct st_request ** aSRpnt)
1820 {
1821 int transfer, blks, bytes;
1822 unsigned char cmd[MAX_COMMAND_SIZE];
1823 struct st_request *SRpnt;
1824 struct st_modedef *STm;
1825 struct st_partstat *STps;
1826 struct st_buffer *STbp;
1827 int retval = 0;
1828 char *name = tape_name(STp);
1829
1830 if (count == 0)
1831 return 0;
1832
1833 STm = &(STp->modes[STp->current_mode]);
1834 STps = &(STp->ps[STp->partition]);
1835 if (STps->eof == ST_FM_HIT)
1836 return 1;
1837 STbp = STp->buffer;
1838
1839 if (STp->block_size == 0)
1840 blks = bytes = count;
1841 else {
1842 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1843 blks = (STp->buffer)->buffer_blocks;
1844 bytes = blks * STp->block_size;
1845 } else {
1846 bytes = count;
1847 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1848 bytes = (STp->buffer)->buffer_size;
1849 blks = bytes / STp->block_size;
1850 bytes = blks * STp->block_size;
1851 }
1852 }
1853
1854 memset(cmd, 0, MAX_COMMAND_SIZE);
1855 cmd[0] = READ_6;
1856 cmd[1] = (STp->block_size != 0);
1857 if (!cmd[1] && STp->sili)
1858 cmd[1] |= 2;
1859 cmd[2] = blks >> 16;
1860 cmd[3] = blks >> 8;
1861 cmd[4] = blks;
1862
1863 SRpnt = *aSRpnt;
1864 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1865 STp->device->request_queue->rq_timeout,
1866 MAX_RETRIES, 1);
1867 release_buffering(STp, 1);
1868 *aSRpnt = SRpnt;
1869 if (!SRpnt)
1870 return STbp->syscall_result;
1871
1872 STbp->read_pointer = 0;
1873 STps->at_sm = 0;
1874
1875 /* Something to check */
1876 if (STbp->syscall_result) {
1877 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1878
1879 retval = 1;
1880 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1881 name,
1882 SRpnt->sense[0], SRpnt->sense[1],
1883 SRpnt->sense[2], SRpnt->sense[3],
1884 SRpnt->sense[4], SRpnt->sense[5],
1885 SRpnt->sense[6], SRpnt->sense[7]));
1886 if (cmdstatp->have_sense) {
1887
1888 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1889 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1890
1891 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1892 /* Compute the residual count */
1893 if (cmdstatp->remainder_valid)
1894 transfer = (int)cmdstatp->uremainder64;
1895 else
1896 transfer = 0;
1897 if (STp->block_size == 0 &&
1898 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1899 transfer = bytes;
1900
1901 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1902 if (STp->block_size == 0) {
1903 if (transfer <= 0) {
1904 if (transfer < 0)
1905 printk(KERN_NOTICE
1906 "%s: Failed to read %d byte block with %d byte transfer.\n",
1907 name, bytes - transfer, bytes);
1908 if (STps->drv_block >= 0)
1909 STps->drv_block += 1;
1910 STbp->buffer_bytes = 0;
1911 return (-ENOMEM);
1912 }
1913 STbp->buffer_bytes = bytes - transfer;
1914 } else {
1915 st_release_request(SRpnt);
1916 SRpnt = *aSRpnt = NULL;
1917 if (transfer == blks) { /* We did not get anything, error */
1918 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1919 if (STps->drv_block >= 0)
1920 STps->drv_block += blks - transfer + 1;
1921 st_int_ioctl(STp, MTBSR, 1);
1922 return (-EIO);
1923 }
1924 /* We have some data, deliver it */
1925 STbp->buffer_bytes = (blks - transfer) *
1926 STp->block_size;
1927 DEBC(printk(ST_DEB_MSG
1928 "%s: ILI but enough data received %ld %d.\n",
1929 name, count, STbp->buffer_bytes));
1930 if (STps->drv_block >= 0)
1931 STps->drv_block += 1;
1932 if (st_int_ioctl(STp, MTBSR, 1))
1933 return (-EIO);
1934 }
1935 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1936 if (STps->eof != ST_FM_HIT)
1937 STps->eof = ST_FM_HIT;
1938 else
1939 STps->eof = ST_EOD_2;
1940 if (STp->block_size == 0)
1941 STbp->buffer_bytes = 0;
1942 else
1943 STbp->buffer_bytes =
1944 bytes - transfer * STp->block_size;
1945 DEBC(printk(ST_DEB_MSG
1946 "%s: EOF detected (%d bytes read).\n",
1947 name, STbp->buffer_bytes));
1948 } else if (cmdstatp->flags & SENSE_EOM) {
1949 if (STps->eof == ST_FM)
1950 STps->eof = ST_EOD_1;
1951 else
1952 STps->eof = ST_EOM_OK;
1953 if (STp->block_size == 0)
1954 STbp->buffer_bytes = bytes - transfer;
1955 else
1956 STbp->buffer_bytes =
1957 bytes - transfer * STp->block_size;
1958
1959 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1960 name, STbp->buffer_bytes));
1961 }
1962 }
1963 /* end of EOF, EOM, ILI test */
1964 else { /* nonzero sense key */
1965 DEBC(printk(ST_DEB_MSG
1966 "%s: Tape error while reading.\n", name));
1967 STps->drv_block = (-1);
1968 if (STps->eof == ST_FM &&
1969 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1970 DEBC(printk(ST_DEB_MSG
1971 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1972 name));
1973 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1974 } else /* Some other extended sense code */
1975 retval = (-EIO);
1976 }
1977
1978 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1979 STbp->buffer_bytes = 0;
1980 }
1981 /* End of extended sense test */
1982 else { /* Non-extended sense */
1983 retval = STbp->syscall_result;
1984 }
1985
1986 }
1987 /* End of error handling */
1988 else { /* Read successful */
1989 STbp->buffer_bytes = bytes;
1990 if (STp->sili) /* In fixed block mode residual is always zero here */
1991 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
1992 }
1993
1994 if (STps->drv_block >= 0) {
1995 if (STp->block_size == 0)
1996 STps->drv_block++;
1997 else
1998 STps->drv_block += STbp->buffer_bytes / STp->block_size;
1999 }
2000 return retval;
2001 }
2002 \f
2003
2004 /* Read command */
2005 static ssize_t
2006 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2007 {
2008 ssize_t total;
2009 ssize_t retval = 0;
2010 ssize_t i, transfer;
2011 int special, do_dio = 0;
2012 struct st_request *SRpnt = NULL;
2013 struct scsi_tape *STp = filp->private_data;
2014 struct st_modedef *STm;
2015 struct st_partstat *STps;
2016 struct st_buffer *STbp = STp->buffer;
2017 DEB( char *name = tape_name(STp); )
2018
2019 if (mutex_lock_interruptible(&STp->lock))
2020 return -ERESTARTSYS;
2021
2022 retval = rw_checks(STp, filp, count);
2023 if (retval || count == 0)
2024 goto out;
2025
2026 STm = &(STp->modes[STp->current_mode]);
2027 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2028 if (!STm->do_read_ahead) {
2029 retval = (-EINVAL); /* Read must be integral number of blocks */
2030 goto out;
2031 }
2032 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2033 }
2034
2035 STps = &(STp->ps[STp->partition]);
2036 if (STps->rw == ST_WRITING) {
2037 retval = flush_buffer(STp, 0);
2038 if (retval)
2039 goto out;
2040 STps->rw = ST_READING;
2041 }
2042 DEB(
2043 if (debugging && STps->eof != ST_NOEOF)
2044 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2045 STps->eof, STbp->buffer_bytes);
2046 ) /* end DEB */
2047
2048 retval = setup_buffering(STp, buf, count, 1);
2049 if (retval)
2050 goto out;
2051 do_dio = STbp->do_dio;
2052
2053 if (STbp->buffer_bytes == 0 &&
2054 STps->eof >= ST_EOD_1) {
2055 if (STps->eof < ST_EOD) {
2056 STps->eof += 1;
2057 retval = 0;
2058 goto out;
2059 }
2060 retval = (-EIO); /* EOM or Blank Check */
2061 goto out;
2062 }
2063
2064 if (do_dio) {
2065 /* Check the buffer writability before any tape movement. Don't alter
2066 buffer data. */
2067 if (copy_from_user(&i, buf, 1) != 0 ||
2068 copy_to_user(buf, &i, 1) != 0 ||
2069 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2070 copy_to_user(buf + count - 1, &i, 1) != 0) {
2071 retval = (-EFAULT);
2072 goto out;
2073 }
2074 }
2075
2076 STps->rw = ST_READING;
2077
2078
2079 /* Loop until enough data in buffer or a special condition found */
2080 for (total = 0, special = 0; total < count && !special;) {
2081
2082 /* Get new data if the buffer is empty */
2083 if (STbp->buffer_bytes == 0) {
2084 special = read_tape(STp, count - total, &SRpnt);
2085 if (special < 0) { /* No need to continue read */
2086 retval = special;
2087 goto out;
2088 }
2089 }
2090
2091 /* Move the data from driver buffer to user buffer */
2092 if (STbp->buffer_bytes > 0) {
2093 DEB(
2094 if (debugging && STps->eof != ST_NOEOF)
2095 printk(ST_DEB_MSG
2096 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2097 STps->eof, STbp->buffer_bytes,
2098 (int)(count - total));
2099 ) /* end DEB */
2100 transfer = STbp->buffer_bytes < count - total ?
2101 STbp->buffer_bytes : count - total;
2102 if (!do_dio) {
2103 i = from_buffer(STbp, buf, transfer);
2104 if (i) {
2105 retval = i;
2106 goto out;
2107 }
2108 }
2109 buf += transfer;
2110 total += transfer;
2111 }
2112
2113 if (STp->block_size == 0)
2114 break; /* Read only one variable length block */
2115
2116 } /* for (total = 0, special = 0;
2117 total < count && !special; ) */
2118
2119 /* Change the eof state if no data from tape or buffer */
2120 if (total == 0) {
2121 if (STps->eof == ST_FM_HIT) {
2122 STps->eof = ST_FM;
2123 STps->drv_block = 0;
2124 if (STps->drv_file >= 0)
2125 STps->drv_file++;
2126 } else if (STps->eof == ST_EOD_1) {
2127 STps->eof = ST_EOD_2;
2128 STps->drv_block = 0;
2129 if (STps->drv_file >= 0)
2130 STps->drv_file++;
2131 } else if (STps->eof == ST_EOD_2)
2132 STps->eof = ST_EOD;
2133 } else if (STps->eof == ST_FM)
2134 STps->eof = ST_NOEOF;
2135 retval = total;
2136
2137 out:
2138 if (SRpnt != NULL) {
2139 st_release_request(SRpnt);
2140 SRpnt = NULL;
2141 }
2142 if (do_dio) {
2143 release_buffering(STp, 1);
2144 STbp->buffer_bytes = 0;
2145 }
2146 mutex_unlock(&STp->lock);
2147
2148 return retval;
2149 }
2150 \f
2151
2152
2153 DEB(
2154 /* Set the driver options */
2155 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2156 {
2157 if (debugging) {
2158 printk(KERN_INFO
2159 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2160 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2161 STm->do_read_ahead);
2162 printk(KERN_INFO
2163 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2164 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2165 printk(KERN_INFO
2166 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2167 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2168 STp->scsi2_logical);
2169 printk(KERN_INFO
2170 "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate,
2171 STp->sili);
2172 printk(KERN_INFO "%s: debugging: %d\n",
2173 name, debugging);
2174 }
2175 }
2176 )
2177
2178
2179 static int st_set_options(struct scsi_tape *STp, long options)
2180 {
2181 int value;
2182 long code;
2183 struct st_modedef *STm;
2184 char *name = tape_name(STp);
2185 struct cdev *cd0, *cd1;
2186
2187 STm = &(STp->modes[STp->current_mode]);
2188 if (!STm->defined) {
2189 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2190 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2191 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
2192 modes_defined = 1;
2193 DEBC(printk(ST_DEB_MSG
2194 "%s: Initialized mode %d definition from mode 0\n",
2195 name, STp->current_mode));
2196 }
2197
2198 code = options & MT_ST_OPTIONS;
2199 if (code == MT_ST_BOOLEANS) {
2200 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2201 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2202 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2203 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2204 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2205 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2206 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2207 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2208 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2209 if ((STp->device)->scsi_level >= SCSI_2)
2210 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2211 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2212 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2213 STm->sysv = (options & MT_ST_SYSV) != 0;
2214 STp->sili = (options & MT_ST_SILI) != 0;
2215 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2216 st_log_options(STp, STm, name); )
2217 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2218 value = (code == MT_ST_SETBOOLEANS);
2219 if ((options & MT_ST_BUFFER_WRITES) != 0)
2220 STm->do_buffer_writes = value;
2221 if ((options & MT_ST_ASYNC_WRITES) != 0)
2222 STm->do_async_writes = value;
2223 if ((options & MT_ST_DEF_WRITES) != 0)
2224 STm->defaults_for_writes = value;
2225 if ((options & MT_ST_READ_AHEAD) != 0)
2226 STm->do_read_ahead = value;
2227 if ((options & MT_ST_TWO_FM) != 0)
2228 STp->two_fm = value;
2229 if ((options & MT_ST_FAST_MTEOM) != 0)
2230 STp->fast_mteom = value;
2231 if ((options & MT_ST_AUTO_LOCK) != 0)
2232 STp->do_auto_lock = value;
2233 if ((options & MT_ST_CAN_BSR) != 0)
2234 STp->can_bsr = value;
2235 if ((options & MT_ST_NO_BLKLIMS) != 0)
2236 STp->omit_blklims = value;
2237 if ((STp->device)->scsi_level >= SCSI_2 &&
2238 (options & MT_ST_CAN_PARTITIONS) != 0)
2239 STp->can_partitions = value;
2240 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2241 STp->scsi2_logical = value;
2242 if ((options & MT_ST_NOWAIT) != 0)
2243 STp->immediate = value;
2244 if ((options & MT_ST_SYSV) != 0)
2245 STm->sysv = value;
2246 if ((options & MT_ST_SILI) != 0)
2247 STp->sili = value;
2248 DEB(
2249 if ((options & MT_ST_DEBUGGING) != 0)
2250 debugging = value;
2251 st_log_options(STp, STm, name); )
2252 } else if (code == MT_ST_WRITE_THRESHOLD) {
2253 /* Retained for compatibility */
2254 } else if (code == MT_ST_DEF_BLKSIZE) {
2255 value = (options & ~MT_ST_OPTIONS);
2256 if (value == ~MT_ST_OPTIONS) {
2257 STm->default_blksize = (-1);
2258 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2259 } else {
2260 STm->default_blksize = value;
2261 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2262 name, STm->default_blksize));
2263 if (STp->ready == ST_READY) {
2264 STp->blksize_changed = 0;
2265 set_mode_densblk(STp, STm);
2266 }
2267 }
2268 } else if (code == MT_ST_TIMEOUTS) {
2269 value = (options & ~MT_ST_OPTIONS);
2270 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2271 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2272 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2273 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2274 } else {
2275 blk_queue_rq_timeout(STp->device->request_queue,
2276 value * HZ);
2277 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2278 name, value) );
2279 }
2280 } else if (code == MT_ST_SET_CLN) {
2281 value = (options & ~MT_ST_OPTIONS) & 0xff;
2282 if (value != 0 &&
2283 (value < EXTENDED_SENSE_START ||
2284 value >= SCSI_SENSE_BUFFERSIZE))
2285 return (-EINVAL);
2286 STp->cln_mode = value;
2287 STp->cln_sense_mask = (options >> 8) & 0xff;
2288 STp->cln_sense_value = (options >> 16) & 0xff;
2289 printk(KERN_INFO
2290 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2291 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2292 } else if (code == MT_ST_DEF_OPTIONS) {
2293 code = (options & ~MT_ST_CLEAR_DEFAULT);
2294 value = (options & MT_ST_CLEAR_DEFAULT);
2295 if (code == MT_ST_DEF_DENSITY) {
2296 if (value == MT_ST_CLEAR_DEFAULT) {
2297 STm->default_density = (-1);
2298 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2299 name));
2300 } else {
2301 STm->default_density = value & 0xff;
2302 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2303 name, STm->default_density));
2304 if (STp->ready == ST_READY) {
2305 STp->density_changed = 0;
2306 set_mode_densblk(STp, STm);
2307 }
2308 }
2309 } else if (code == MT_ST_DEF_DRVBUFFER) {
2310 if (value == MT_ST_CLEAR_DEFAULT) {
2311 STp->default_drvbuffer = 0xff;
2312 DEBC( printk(KERN_INFO
2313 "%s: Drive buffer default disabled.\n", name));
2314 } else {
2315 STp->default_drvbuffer = value & 7;
2316 DEBC( printk(KERN_INFO
2317 "%s: Drive buffer default set to %x\n",
2318 name, STp->default_drvbuffer));
2319 if (STp->ready == ST_READY)
2320 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2321 }
2322 } else if (code == MT_ST_DEF_COMPRESSION) {
2323 if (value == MT_ST_CLEAR_DEFAULT) {
2324 STm->default_compression = ST_DONT_TOUCH;
2325 DEBC( printk(KERN_INFO
2326 "%s: Compression default disabled.\n", name));
2327 } else {
2328 if ((value & 0xff00) != 0) {
2329 STp->c_algo = (value & 0xff00) >> 8;
2330 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2331 name, STp->c_algo));
2332 }
2333 if ((value & 0xff) != 0xff) {
2334 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2335 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2336 name, (value & 1)));
2337 if (STp->ready == ST_READY) {
2338 STp->compression_changed = 0;
2339 st_compression(STp, (STm->default_compression == ST_YES));
2340 }
2341 }
2342 }
2343 }
2344 } else
2345 return (-EIO);
2346
2347 return 0;
2348 }
2349 \f
2350 #define MODE_HEADER_LENGTH 4
2351
2352 /* Mode header and page byte offsets */
2353 #define MH_OFF_DATA_LENGTH 0
2354 #define MH_OFF_MEDIUM_TYPE 1
2355 #define MH_OFF_DEV_SPECIFIC 2
2356 #define MH_OFF_BDESCS_LENGTH 3
2357 #define MP_OFF_PAGE_NBR 0
2358 #define MP_OFF_PAGE_LENGTH 1
2359
2360 /* Mode header and page bit masks */
2361 #define MH_BIT_WP 0x80
2362 #define MP_MSK_PAGE_NBR 0x3f
2363
2364 /* Don't return block descriptors */
2365 #define MODE_SENSE_OMIT_BDESCS 0x08
2366
2367 #define MODE_SELECT_PAGE_FORMAT 0x10
2368
2369 /* Read a mode page into the tape buffer. The block descriptors are included
2370 if incl_block_descs is true. The page control is ored to the page number
2371 parameter, if necessary. */
2372 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2373 {
2374 unsigned char cmd[MAX_COMMAND_SIZE];
2375 struct st_request *SRpnt;
2376
2377 memset(cmd, 0, MAX_COMMAND_SIZE);
2378 cmd[0] = MODE_SENSE;
2379 if (omit_block_descs)
2380 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2381 cmd[2] = page;
2382 cmd[4] = 255;
2383
2384 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2385 STp->device->request_queue->rq_timeout, 0, 1);
2386 if (SRpnt == NULL)
2387 return (STp->buffer)->syscall_result;
2388
2389 st_release_request(SRpnt);
2390
2391 return STp->buffer->syscall_result;
2392 }
2393
2394
2395 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2396 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2397 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2398 {
2399 int pgo;
2400 unsigned char cmd[MAX_COMMAND_SIZE];
2401 struct st_request *SRpnt;
2402 int timeout;
2403
2404 memset(cmd, 0, MAX_COMMAND_SIZE);
2405 cmd[0] = MODE_SELECT;
2406 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2407 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2408 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2409
2410 /* Clear reserved fields */
2411 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2412 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2413 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2414 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2415
2416 timeout = slow ?
2417 STp->long_timeout : STp->device->request_queue->rq_timeout;
2418 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2419 timeout, 0, 1);
2420 if (SRpnt == NULL)
2421 return (STp->buffer)->syscall_result;
2422
2423 st_release_request(SRpnt);
2424
2425 return STp->buffer->syscall_result;
2426 }
2427
2428
2429 #define COMPRESSION_PAGE 0x0f
2430 #define COMPRESSION_PAGE_LENGTH 16
2431
2432 #define CP_OFF_DCE_DCC 2
2433 #define CP_OFF_C_ALGO 7
2434
2435 #define DCE_MASK 0x80
2436 #define DCC_MASK 0x40
2437 #define RED_MASK 0x60
2438
2439
2440 /* Control the compression with mode page 15. Algorithm not changed if zero.
2441
2442 The block descriptors are read and written because Sony SDT-7000 does not
2443 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2444 Including block descriptors should not cause any harm to other drives. */
2445
2446 static int st_compression(struct scsi_tape * STp, int state)
2447 {
2448 int retval;
2449 int mpoffs; /* Offset to mode page start */
2450 unsigned char *b_data = (STp->buffer)->b_data;
2451 DEB( char *name = tape_name(STp); )
2452
2453 if (STp->ready != ST_READY)
2454 return (-EIO);
2455
2456 /* Read the current page contents */
2457 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2458 if (retval) {
2459 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2460 name));
2461 return (-EIO);
2462 }
2463
2464 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2465 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2466 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2467
2468 /* Check if compression can be changed */
2469 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2470 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2471 return (-EIO);
2472 }
2473
2474 /* Do the change */
2475 if (state) {
2476 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2477 if (STp->c_algo != 0)
2478 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2479 }
2480 else {
2481 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2482 if (STp->c_algo != 0)
2483 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2484 }
2485
2486 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2487 if (retval) {
2488 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2489 return (-EIO);
2490 }
2491 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2492 name, state));
2493
2494 STp->compression_changed = 1;
2495 return 0;
2496 }
2497
2498
2499 /* Process the load and unload commands (does unload if the load code is zero) */
2500 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2501 {
2502 int retval = (-EIO), timeout;
2503 DEB( char *name = tape_name(STp); )
2504 unsigned char cmd[MAX_COMMAND_SIZE];
2505 struct st_partstat *STps;
2506 struct st_request *SRpnt;
2507
2508 if (STp->ready != ST_READY && !load_code) {
2509 if (STp->ready == ST_NO_TAPE)
2510 return (-ENOMEDIUM);
2511 else
2512 return (-EIO);
2513 }
2514
2515 memset(cmd, 0, MAX_COMMAND_SIZE);
2516 cmd[0] = START_STOP;
2517 if (load_code)
2518 cmd[4] |= 1;
2519 /*
2520 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2521 */
2522 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2523 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2524 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2525 name, (cmd[4]) ? "" : "un",
2526 load_code - MT_ST_HPLOADER_OFFSET));
2527 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2528 }
2529 if (STp->immediate) {
2530 cmd[1] = 1; /* Don't wait for completion */
2531 timeout = STp->device->request_queue->rq_timeout;
2532 }
2533 else
2534 timeout = STp->long_timeout;
2535
2536 DEBC(
2537 if (!load_code)
2538 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2539 else
2540 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2541 );
2542
2543 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2544 timeout, MAX_RETRIES, 1);
2545 if (!SRpnt)
2546 return (STp->buffer)->syscall_result;
2547
2548 retval = (STp->buffer)->syscall_result;
2549 st_release_request(SRpnt);
2550
2551 if (!retval) { /* SCSI command successful */
2552
2553 if (!load_code) {
2554 STp->rew_at_close = 0;
2555 STp->ready = ST_NO_TAPE;
2556 }
2557 else {
2558 STp->rew_at_close = STp->autorew_dev;
2559 retval = check_tape(STp, filp);
2560 if (retval > 0)
2561 retval = 0;
2562 }
2563 }
2564 else {
2565 STps = &(STp->ps[STp->partition]);
2566 STps->drv_file = STps->drv_block = (-1);
2567 }
2568
2569 return retval;
2570 }
2571 \f
2572 #if DEBUG
2573 #define ST_DEB_FORWARD 0
2574 #define ST_DEB_BACKWARD 1
2575 static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2576 {
2577 s32 sc;
2578
2579 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2580 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2581 if (direction)
2582 sc = -sc;
2583 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2584 direction ? "backward" : "forward", sc, units);
2585 }
2586 #endif
2587
2588
2589 /* Internal ioctl function */
2590 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2591 {
2592 int timeout;
2593 long ltmp;
2594 int ioctl_result;
2595 int chg_eof = 1;
2596 unsigned char cmd[MAX_COMMAND_SIZE];
2597 struct st_request *SRpnt;
2598 struct st_partstat *STps;
2599 int fileno, blkno, at_sm, undone;
2600 int datalen = 0, direction = DMA_NONE;
2601 char *name = tape_name(STp);
2602
2603 WARN_ON(STp->buffer->do_dio != 0);
2604 if (STp->ready != ST_READY) {
2605 if (STp->ready == ST_NO_TAPE)
2606 return (-ENOMEDIUM);
2607 else
2608 return (-EIO);
2609 }
2610 timeout = STp->long_timeout;
2611 STps = &(STp->ps[STp->partition]);
2612 fileno = STps->drv_file;
2613 blkno = STps->drv_block;
2614 at_sm = STps->at_sm;
2615
2616 memset(cmd, 0, MAX_COMMAND_SIZE);
2617 switch (cmd_in) {
2618 case MTFSFM:
2619 chg_eof = 0; /* Changed from the FSF after this */
2620 case MTFSF:
2621 cmd[0] = SPACE;
2622 cmd[1] = 0x01; /* Space FileMarks */
2623 cmd[2] = (arg >> 16);
2624 cmd[3] = (arg >> 8);
2625 cmd[4] = arg;
2626 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2627 if (fileno >= 0)
2628 fileno += arg;
2629 blkno = 0;
2630 at_sm &= (arg == 0);
2631 break;
2632 case MTBSFM:
2633 chg_eof = 0; /* Changed from the FSF after this */
2634 case MTBSF:
2635 cmd[0] = SPACE;
2636 cmd[1] = 0x01; /* Space FileMarks */
2637 ltmp = (-arg);
2638 cmd[2] = (ltmp >> 16);
2639 cmd[3] = (ltmp >> 8);
2640 cmd[4] = ltmp;
2641 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2642 if (fileno >= 0)
2643 fileno -= arg;
2644 blkno = (-1); /* We can't know the block number */
2645 at_sm &= (arg == 0);
2646 break;
2647 case MTFSR:
2648 cmd[0] = SPACE;
2649 cmd[1] = 0x00; /* Space Blocks */
2650 cmd[2] = (arg >> 16);
2651 cmd[3] = (arg >> 8);
2652 cmd[4] = arg;
2653 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2654 if (blkno >= 0)
2655 blkno += arg;
2656 at_sm &= (arg == 0);
2657 break;
2658 case MTBSR:
2659 cmd[0] = SPACE;
2660 cmd[1] = 0x00; /* Space Blocks */
2661 ltmp = (-arg);
2662 cmd[2] = (ltmp >> 16);
2663 cmd[3] = (ltmp >> 8);
2664 cmd[4] = ltmp;
2665 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
2666 if (blkno >= 0)
2667 blkno -= arg;
2668 at_sm &= (arg == 0);
2669 break;
2670 case MTFSS:
2671 cmd[0] = SPACE;
2672 cmd[1] = 0x04; /* Space Setmarks */
2673 cmd[2] = (arg >> 16);
2674 cmd[3] = (arg >> 8);
2675 cmd[4] = arg;
2676 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2677 if (arg != 0) {
2678 blkno = fileno = (-1);
2679 at_sm = 1;
2680 }
2681 break;
2682 case MTBSS:
2683 cmd[0] = SPACE;
2684 cmd[1] = 0x04; /* Space Setmarks */
2685 ltmp = (-arg);
2686 cmd[2] = (ltmp >> 16);
2687 cmd[3] = (ltmp >> 8);
2688 cmd[4] = ltmp;
2689 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
2690 if (arg != 0) {
2691 blkno = fileno = (-1);
2692 at_sm = 1;
2693 }
2694 break;
2695 case MTWEOF:
2696 case MTWSM:
2697 if (STp->write_prot)
2698 return (-EACCES);
2699 cmd[0] = WRITE_FILEMARKS;
2700 if (cmd_in == MTWSM)
2701 cmd[1] = 2;
2702 cmd[2] = (arg >> 16);
2703 cmd[3] = (arg >> 8);
2704 cmd[4] = arg;
2705 timeout = STp->device->request_queue->rq_timeout;
2706 DEBC(
2707 if (cmd_in == MTWEOF)
2708 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2709 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2710 else
2711 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2712 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2713 )
2714 if (fileno >= 0)
2715 fileno += arg;
2716 blkno = 0;
2717 at_sm = (cmd_in == MTWSM);
2718 break;
2719 case MTREW:
2720 cmd[0] = REZERO_UNIT;
2721 if (STp->immediate) {
2722 cmd[1] = 1; /* Don't wait for completion */
2723 timeout = STp->device->request_queue->rq_timeout;
2724 }
2725 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2726 fileno = blkno = at_sm = 0;
2727 break;
2728 case MTNOP:
2729 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2730 return 0; /* Should do something ? */
2731 break;
2732 case MTRETEN:
2733 cmd[0] = START_STOP;
2734 if (STp->immediate) {
2735 cmd[1] = 1; /* Don't wait for completion */
2736 timeout = STp->device->request_queue->rq_timeout;
2737 }
2738 cmd[4] = 3;
2739 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2740 fileno = blkno = at_sm = 0;
2741 break;
2742 case MTEOM:
2743 if (!STp->fast_mteom) {
2744 /* space to the end of tape */
2745 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2746 fileno = STps->drv_file;
2747 if (STps->eof >= ST_EOD_1)
2748 return 0;
2749 /* The next lines would hide the number of spaced FileMarks
2750 That's why I inserted the previous lines. I had no luck
2751 with detecting EOM with FSF, so we go now to EOM.
2752 Joerg Weule */
2753 } else
2754 fileno = (-1);
2755 cmd[0] = SPACE;
2756 cmd[1] = 3;
2757 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2758 name));
2759 blkno = -1;
2760 at_sm = 0;
2761 break;
2762 case MTERASE:
2763 if (STp->write_prot)
2764 return (-EACCES);
2765 cmd[0] = ERASE;
2766 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2767 if (STp->immediate) {
2768 cmd[1] |= 2; /* Don't wait for completion */
2769 timeout = STp->device->request_queue->rq_timeout;
2770 }
2771 else
2772 timeout = STp->long_timeout * 8;
2773
2774 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2775 fileno = blkno = at_sm = 0;
2776 break;
2777 case MTSETBLK: /* Set block length */
2778 case MTSETDENSITY: /* Set tape density */
2779 case MTSETDRVBUFFER: /* Set drive buffering */
2780 case SET_DENS_AND_BLK: /* Set density and block size */
2781 chg_eof = 0;
2782 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2783 return (-EIO); /* Not allowed if data in buffer */
2784 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2785 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2786 STp->max_block > 0 &&
2787 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2788 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2789 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2790 return (-EINVAL);
2791 }
2792 cmd[0] = MODE_SELECT;
2793 if ((STp->use_pf & USE_PF))
2794 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2795 cmd[4] = datalen = 12;
2796 direction = DMA_TO_DEVICE;
2797
2798 memset((STp->buffer)->b_data, 0, 12);
2799 if (cmd_in == MTSETDRVBUFFER)
2800 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2801 else
2802 (STp->buffer)->b_data[2] =
2803 STp->drv_buffer << 4;
2804 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2805 if (cmd_in == MTSETDENSITY) {
2806 (STp->buffer)->b_data[4] = arg;
2807 STp->density_changed = 1; /* At least we tried ;-) */
2808 } else if (cmd_in == SET_DENS_AND_BLK)
2809 (STp->buffer)->b_data[4] = arg >> 24;
2810 else
2811 (STp->buffer)->b_data[4] = STp->density;
2812 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2813 ltmp = arg & MT_ST_BLKSIZE_MASK;
2814 if (cmd_in == MTSETBLK)
2815 STp->blksize_changed = 1; /* At least we tried ;-) */
2816 } else
2817 ltmp = STp->block_size;
2818 (STp->buffer)->b_data[9] = (ltmp >> 16);
2819 (STp->buffer)->b_data[10] = (ltmp >> 8);
2820 (STp->buffer)->b_data[11] = ltmp;
2821 timeout = STp->device->request_queue->rq_timeout;
2822 DEBC(
2823 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2824 printk(ST_DEB_MSG
2825 "%s: Setting block size to %d bytes.\n", name,
2826 (STp->buffer)->b_data[9] * 65536 +
2827 (STp->buffer)->b_data[10] * 256 +
2828 (STp->buffer)->b_data[11]);
2829 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2830 printk(ST_DEB_MSG
2831 "%s: Setting density code to %x.\n", name,
2832 (STp->buffer)->b_data[4]);
2833 if (cmd_in == MTSETDRVBUFFER)
2834 printk(ST_DEB_MSG
2835 "%s: Setting drive buffer code to %d.\n", name,
2836 ((STp->buffer)->b_data[2] >> 4) & 7);
2837 )
2838 break;
2839 default:
2840 return (-ENOSYS);
2841 }
2842
2843 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2844 timeout, MAX_RETRIES, 1);
2845 if (!SRpnt)
2846 return (STp->buffer)->syscall_result;
2847
2848 ioctl_result = (STp->buffer)->syscall_result;
2849
2850 if (!ioctl_result) { /* SCSI command successful */
2851 st_release_request(SRpnt);
2852 SRpnt = NULL;
2853 STps->drv_block = blkno;
2854 STps->drv_file = fileno;
2855 STps->at_sm = at_sm;
2856
2857 if (cmd_in == MTBSFM)
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2859 else if (cmd_in == MTFSFM)
2860 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2861
2862 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2863 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2864 if (STp->block_size != 0) {
2865 (STp->buffer)->buffer_blocks =
2866 (STp->buffer)->buffer_size / STp->block_size;
2867 }
2868 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2869 if (cmd_in == SET_DENS_AND_BLK)
2870 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2871 } else if (cmd_in == MTSETDRVBUFFER)
2872 STp->drv_buffer = (arg & 7);
2873 else if (cmd_in == MTSETDENSITY)
2874 STp->density = arg;
2875
2876 if (cmd_in == MTEOM)
2877 STps->eof = ST_EOD;
2878 else if (cmd_in == MTFSF)
2879 STps->eof = ST_FM;
2880 else if (chg_eof)
2881 STps->eof = ST_NOEOF;
2882
2883 if (cmd_in == MTWEOF)
2884 STps->rw = ST_IDLE;
2885 } else { /* SCSI command was not completely successful. Don't return
2886 from this block without releasing the SCSI command block! */
2887 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2888
2889 if (cmdstatp->flags & SENSE_EOM) {
2890 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2891 cmd_in != MTBSR && cmd_in != MTBSS)
2892 STps->eof = ST_EOM_OK;
2893 STps->drv_block = 0;
2894 }
2895
2896 if (cmdstatp->remainder_valid)
2897 undone = (int)cmdstatp->uremainder64;
2898 else
2899 undone = 0;
2900
2901 if (cmd_in == MTWEOF &&
2902 cmdstatp->have_sense &&
2903 (cmdstatp->flags & SENSE_EOM)) {
2904 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2905 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2906 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2907 STps->eof = ST_NOEOF;
2908 } else { /* Writing EOF(s) failed */
2909 if (fileno >= 0)
2910 fileno -= undone;
2911 if (undone < arg)
2912 STps->eof = ST_NOEOF;
2913 }
2914 STps->drv_file = fileno;
2915 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2916 if (fileno >= 0)
2917 STps->drv_file = fileno - undone;
2918 else
2919 STps->drv_file = fileno;
2920 STps->drv_block = -1;
2921 STps->eof = ST_NOEOF;
2922 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2923 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2924 undone = (-undone);
2925 if (STps->drv_file >= 0)
2926 STps->drv_file = fileno + undone;
2927 STps->drv_block = 0;
2928 STps->eof = ST_NOEOF;
2929 } else if (cmd_in == MTFSR) {
2930 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2931 if (STps->drv_file >= 0)
2932 STps->drv_file++;
2933 STps->drv_block = 0;
2934 STps->eof = ST_FM;
2935 } else {
2936 if (blkno >= undone)
2937 STps->drv_block = blkno - undone;
2938 else
2939 STps->drv_block = (-1);
2940 STps->eof = ST_NOEOF;
2941 }
2942 } else if (cmd_in == MTBSR) {
2943 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2944 STps->drv_file--;
2945 STps->drv_block = (-1);
2946 } else {
2947 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2948 undone = (-undone);
2949 if (STps->drv_block >= 0)
2950 STps->drv_block = blkno + undone;
2951 }
2952 STps->eof = ST_NOEOF;
2953 } else if (cmd_in == MTEOM) {
2954 STps->drv_file = (-1);
2955 STps->drv_block = (-1);
2956 STps->eof = ST_EOD;
2957 } else if (cmd_in == MTSETBLK ||
2958 cmd_in == MTSETDENSITY ||
2959 cmd_in == MTSETDRVBUFFER ||
2960 cmd_in == SET_DENS_AND_BLK) {
2961 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2962 !(STp->use_pf & PF_TESTED)) {
2963 /* Try the other possible state of Page Format if not
2964 already tried */
2965 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
2966 st_release_request(SRpnt);
2967 SRpnt = NULL;
2968 return st_int_ioctl(STp, cmd_in, arg);
2969 }
2970 } else if (chg_eof)
2971 STps->eof = ST_NOEOF;
2972
2973 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
2974 STps->eof = ST_EOD;
2975
2976 st_release_request(SRpnt);
2977 SRpnt = NULL;
2978 }
2979
2980 return ioctl_result;
2981 }
2982 \f
2983
2984 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
2985 structure. */
2986
2987 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
2988 int logical)
2989 {
2990 int result;
2991 unsigned char scmd[MAX_COMMAND_SIZE];
2992 struct st_request *SRpnt;
2993 DEB( char *name = tape_name(STp); )
2994
2995 if (STp->ready != ST_READY)
2996 return (-EIO);
2997
2998 memset(scmd, 0, MAX_COMMAND_SIZE);
2999 if ((STp->device)->scsi_level < SCSI_2) {
3000 scmd[0] = QFA_REQUEST_BLOCK;
3001 scmd[4] = 3;
3002 } else {
3003 scmd[0] = READ_POSITION;
3004 if (!logical && !STp->scsi2_logical)
3005 scmd[1] = 1;
3006 }
3007 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3008 STp->device->request_queue->rq_timeout,
3009 MAX_READY_RETRIES, 1);
3010 if (!SRpnt)
3011 return (STp->buffer)->syscall_result;
3012
3013 if ((STp->buffer)->syscall_result != 0 ||
3014 (STp->device->scsi_level >= SCSI_2 &&
3015 ((STp->buffer)->b_data[0] & 4) != 0)) {
3016 *block = *partition = 0;
3017 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3018 result = (-EIO);
3019 } else {
3020 result = 0;
3021 if ((STp->device)->scsi_level < SCSI_2) {
3022 *block = ((STp->buffer)->b_data[0] << 16)
3023 + ((STp->buffer)->b_data[1] << 8)
3024 + (STp->buffer)->b_data[2];
3025 *partition = 0;
3026 } else {
3027 *block = ((STp->buffer)->b_data[4] << 24)
3028 + ((STp->buffer)->b_data[5] << 16)
3029 + ((STp->buffer)->b_data[6] << 8)
3030 + (STp->buffer)->b_data[7];
3031 *partition = (STp->buffer)->b_data[1];
3032 if (((STp->buffer)->b_data[0] & 0x80) &&
3033 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3034 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3035 }
3036 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3037 *block, *partition));
3038 }
3039 st_release_request(SRpnt);
3040 SRpnt = NULL;
3041
3042 return result;
3043 }
3044
3045
3046 /* Set the tape block and partition. Negative partition means that only the
3047 block should be set in vendor specific way. */
3048 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3049 int logical)
3050 {
3051 struct st_partstat *STps;
3052 int result, p;
3053 unsigned int blk;
3054 int timeout;
3055 unsigned char scmd[MAX_COMMAND_SIZE];
3056 struct st_request *SRpnt;
3057 DEB( char *name = tape_name(STp); )
3058
3059 if (STp->ready != ST_READY)
3060 return (-EIO);
3061 timeout = STp->long_timeout;
3062 STps = &(STp->ps[STp->partition]);
3063
3064 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3065 name, block, partition));
3066 DEB(if (partition < 0)
3067 return (-EIO); )
3068
3069 /* Update the location at the partition we are leaving */
3070 if ((!STp->can_partitions && partition != 0) ||
3071 partition >= ST_NBR_PARTITIONS)
3072 return (-EINVAL);
3073 if (partition != STp->partition) {
3074 if (get_location(STp, &blk, &p, 1))
3075 STps->last_block_valid = 0;
3076 else {
3077 STps->last_block_valid = 1;
3078 STps->last_block_visited = blk;
3079 DEBC(printk(ST_DEB_MSG
3080 "%s: Visited block %d for partition %d saved.\n",
3081 name, blk, STp->partition));
3082 }
3083 }
3084
3085 memset(scmd, 0, MAX_COMMAND_SIZE);
3086 if ((STp->device)->scsi_level < SCSI_2) {
3087 scmd[0] = QFA_SEEK_BLOCK;
3088 scmd[2] = (block >> 16);
3089 scmd[3] = (block >> 8);
3090 scmd[4] = block;
3091 scmd[5] = 0;
3092 } else {
3093 scmd[0] = SEEK_10;
3094 scmd[3] = (block >> 24);
3095 scmd[4] = (block >> 16);
3096 scmd[5] = (block >> 8);
3097 scmd[6] = block;
3098 if (!logical && !STp->scsi2_logical)
3099 scmd[1] = 4;
3100 if (STp->partition != partition) {
3101 scmd[1] |= 2;
3102 scmd[8] = partition;
3103 DEBC(printk(ST_DEB_MSG
3104 "%s: Trying to change partition from %d to %d\n",
3105 name, STp->partition, partition));
3106 }
3107 }
3108 if (STp->immediate) {
3109 scmd[1] |= 1; /* Don't wait for completion */
3110 timeout = STp->device->request_queue->rq_timeout;
3111 }
3112
3113 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3114 timeout, MAX_READY_RETRIES, 1);
3115 if (!SRpnt)
3116 return (STp->buffer)->syscall_result;
3117
3118 STps->drv_block = STps->drv_file = (-1);
3119 STps->eof = ST_NOEOF;
3120 if ((STp->buffer)->syscall_result != 0) {
3121 result = (-EIO);
3122 if (STp->can_partitions &&
3123 (STp->device)->scsi_level >= SCSI_2 &&
3124 (p = find_partition(STp)) >= 0)
3125 STp->partition = p;
3126 } else {
3127 if (STp->can_partitions) {
3128 STp->partition = partition;
3129 STps = &(STp->ps[partition]);
3130 if (!STps->last_block_valid ||
3131 STps->last_block_visited != block) {
3132 STps->at_sm = 0;
3133 STps->rw = ST_IDLE;
3134 }
3135 } else
3136 STps->at_sm = 0;
3137 if (block == 0)
3138 STps->drv_block = STps->drv_file = 0;
3139 result = 0;
3140 }
3141
3142 st_release_request(SRpnt);
3143 SRpnt = NULL;
3144
3145 return result;
3146 }
3147
3148
3149 /* Find the current partition number for the drive status. Called from open and
3150 returns either partition number of negative error code. */
3151 static int find_partition(struct scsi_tape *STp)
3152 {
3153 int i, partition;
3154 unsigned int block;
3155
3156 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3157 return i;
3158 if (partition >= ST_NBR_PARTITIONS)
3159 return (-EIO);
3160 return partition;
3161 }
3162
3163
3164 /* Change the partition if necessary */
3165 static int switch_partition(struct scsi_tape *STp)
3166 {
3167 struct st_partstat *STps;
3168
3169 if (STp->partition == STp->new_partition)
3170 return 0;
3171 STps = &(STp->ps[STp->new_partition]);
3172 if (!STps->last_block_valid)
3173 STps->last_block_visited = 0;
3174 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3175 }
3176 \f
3177 /* Functions for reading and writing the medium partition mode page. */
3178
3179 #define PART_PAGE 0x11
3180 #define PART_PAGE_FIXED_LENGTH 8
3181
3182 #define PP_OFF_MAX_ADD_PARTS 2
3183 #define PP_OFF_NBR_ADD_PARTS 3
3184 #define PP_OFF_FLAGS 4
3185 #define PP_OFF_PART_UNITS 6
3186 #define PP_OFF_RESERVED 7
3187
3188 #define PP_BIT_IDP 0x20
3189 #define PP_MSK_PSUM_MB 0x10
3190
3191 /* Get the number of partitions on the tape. As a side effect reads the
3192 mode page into the tape buffer. */
3193 static int nbr_partitions(struct scsi_tape *STp)
3194 {
3195 int result;
3196 DEB( char *name = tape_name(STp); )
3197
3198 if (STp->ready != ST_READY)
3199 return (-EIO);
3200
3201 result = read_mode_page(STp, PART_PAGE, 1);
3202
3203 if (result) {
3204 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3205 name));
3206 result = (-EIO);
3207 } else {
3208 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3209 PP_OFF_NBR_ADD_PARTS] + 1;
3210 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3211 }
3212
3213 return result;
3214 }
3215
3216
3217 /* Partition the tape into two partitions if size > 0 or one partition if
3218 size == 0.
3219
3220 The block descriptors are read and written because Sony SDT-7000 does not
3221 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3222
3223 My HP C1533A drive returns only one partition size field. This is used to
3224 set the size of partition 1. There is no size field for the default partition.
3225 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3226 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3227 The following algorithm is used to accommodate both drives: if the number of
3228 partition size fields is greater than the maximum number of additional partitions
3229 in the mode page, the second field is used. Otherwise the first field is used.
3230
3231 For Seagate DDS drives the page length must be 8 when no partitions is defined
3232 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3233 is acceptable also to some other old drives and enforced if the first partition
3234 size field is used for the first additional partition size.
3235 */
3236 static int partition_tape(struct scsi_tape *STp, int size)
3237 {
3238 char *name = tape_name(STp);
3239 int result;
3240 int pgo, psd_cnt, psdo;
3241 unsigned char *bp;
3242
3243 result = read_mode_page(STp, PART_PAGE, 0);
3244 if (result) {
3245 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3246 return result;
3247 }
3248 /* The mode page is in the buffer. Let's modify it and write it. */
3249 bp = (STp->buffer)->b_data;
3250 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3251 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3252 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3253
3254 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3255 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3256 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3257 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3258 psdo += 2;
3259 }
3260 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3261
3262 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3263 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3264 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3265
3266 if (size <= 0) {
3267 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3268 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3269 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3270 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3271 name));
3272 } else {
3273 bp[psdo] = (size >> 8) & 0xff;
3274 bp[psdo + 1] = size & 0xff;
3275 bp[pgo + 3] = 1;
3276 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3277 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3278 DEBC(printk(ST_DEB_MSG
3279 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3280 name, size));
3281 }
3282 bp[pgo + PP_OFF_PART_UNITS] = 0;
3283 bp[pgo + PP_OFF_RESERVED] = 0;
3284 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3285
3286 result = write_mode_page(STp, PART_PAGE, 1);
3287 if (result) {
3288 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3289 result = (-EIO);
3290 }
3291
3292 return result;
3293 }
3294 \f
3295
3296
3297 /* The ioctl command */
3298 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3299 {
3300 int i, cmd_nr, cmd_type, bt;
3301 int retval = 0;
3302 unsigned int blk;
3303 struct scsi_tape *STp = file->private_data;
3304 struct st_modedef *STm;
3305 struct st_partstat *STps;
3306 char *name = tape_name(STp);
3307 void __user *p = (void __user *)arg;
3308
3309 if (mutex_lock_interruptible(&STp->lock))
3310 return -ERESTARTSYS;
3311
3312 DEB(
3313 if (debugging && !STp->in_use) {
3314 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3315 retval = (-EIO);
3316 goto out;
3317 } ) /* end DEB */
3318
3319 STm = &(STp->modes[STp->current_mode]);
3320 STps = &(STp->ps[STp->partition]);
3321
3322 /*
3323 * If we are in the middle of error recovery, don't let anyone
3324 * else try and use this device. Also, if error recovery fails, it
3325 * may try and take the device offline, in which case all further
3326 * access to the device is prohibited.
3327 */
3328 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3329 file->f_flags & O_NDELAY);
3330 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3331 goto out;
3332 retval = 0;
3333
3334 cmd_type = _IOC_TYPE(cmd_in);
3335 cmd_nr = _IOC_NR(cmd_in);
3336
3337 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3338 struct mtop mtc;
3339
3340 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3341 retval = (-EINVAL);
3342 goto out;
3343 }
3344
3345 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3346 if (i) {
3347 retval = (-EFAULT);
3348 goto out;
3349 }
3350
3351 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3352 printk(KERN_WARNING
3353 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3354 retval = (-EPERM);
3355 goto out;
3356 }
3357 if (!STm->defined &&
3358 (mtc.mt_op != MTSETDRVBUFFER &&
3359 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3360 retval = (-ENXIO);
3361 goto out;
3362 }
3363
3364 if (!STp->pos_unknown) {
3365
3366 if (STps->eof == ST_FM_HIT) {
3367 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3368 mtc.mt_op == MTEOM) {
3369 mtc.mt_count -= 1;
3370 if (STps->drv_file >= 0)
3371 STps->drv_file += 1;
3372 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3373 mtc.mt_count += 1;
3374 if (STps->drv_file >= 0)
3375 STps->drv_file += 1;
3376 }
3377 }
3378
3379 if (mtc.mt_op == MTSEEK) {
3380 /* Old position must be restored if partition will be
3381 changed */
3382 i = !STp->can_partitions ||
3383 (STp->new_partition != STp->partition);
3384 } else {
3385 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3386 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3387 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3388 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3389 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3390 mtc.mt_op == MTCOMPRESSION;
3391 }
3392 i = flush_buffer(STp, i);
3393 if (i < 0) {
3394 retval = i;
3395 goto out;
3396 }
3397 if (STps->rw == ST_WRITING &&
3398 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3399 mtc.mt_op == MTSEEK ||
3400 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3401 i = st_int_ioctl(STp, MTWEOF, 1);
3402 if (i < 0) {
3403 retval = i;
3404 goto out;
3405 }
3406 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3407 mtc.mt_count++;
3408 STps->rw = ST_IDLE;
3409 }
3410
3411 } else {
3412 /*
3413 * If there was a bus reset, block further access
3414 * to this device. If the user wants to rewind the tape,
3415 * then reset the flag and allow access again.
3416 */
3417 if (mtc.mt_op != MTREW &&
3418 mtc.mt_op != MTOFFL &&
3419 mtc.mt_op != MTRETEN &&
3420 mtc.mt_op != MTERASE &&
3421 mtc.mt_op != MTSEEK &&
3422 mtc.mt_op != MTEOM) {
3423 retval = (-EIO);
3424 goto out;
3425 }
3426 reset_state(STp);
3427 /* remove this when the midlevel properly clears was_reset */
3428 STp->device->was_reset = 0;
3429 }
3430
3431 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3432 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3433 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3434 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3435
3436 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3437 do_door_lock(STp, 0); /* Ignore result! */
3438
3439 if (mtc.mt_op == MTSETDRVBUFFER &&
3440 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3441 retval = st_set_options(STp, mtc.mt_count);
3442 goto out;
3443 }
3444
3445 if (mtc.mt_op == MTSETPART) {
3446 if (!STp->can_partitions ||
3447 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3448 retval = (-EINVAL);
3449 goto out;
3450 }
3451 if (mtc.mt_count >= STp->nbr_partitions &&
3452 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3453 retval = (-EIO);
3454 goto out;
3455 }
3456 if (mtc.mt_count >= STp->nbr_partitions) {
3457 retval = (-EINVAL);
3458 goto out;
3459 }
3460 STp->new_partition = mtc.mt_count;
3461 retval = 0;
3462 goto out;
3463 }
3464
3465 if (mtc.mt_op == MTMKPART) {
3466 if (!STp->can_partitions) {
3467 retval = (-EINVAL);
3468 goto out;
3469 }
3470 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3471 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3472 retval = i;
3473 goto out;
3474 }
3475 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3476 STp->ps[i].rw = ST_IDLE;
3477 STp->ps[i].at_sm = 0;
3478 STp->ps[i].last_block_valid = 0;
3479 }
3480 STp->partition = STp->new_partition = 0;
3481 STp->nbr_partitions = 1; /* Bad guess ?-) */
3482 STps->drv_block = STps->drv_file = 0;
3483 retval = 0;
3484 goto out;
3485 }
3486
3487 if (mtc.mt_op == MTSEEK) {
3488 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3489 if (!STp->can_partitions)
3490 STp->ps[0].rw = ST_IDLE;
3491 retval = i;
3492 goto out;
3493 }
3494
3495 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3496 retval = do_load_unload(STp, file, 0);
3497 goto out;
3498 }
3499
3500 if (mtc.mt_op == MTLOAD) {
3501 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3502 goto out;
3503 }
3504
3505 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3506 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3507 goto out;
3508 }
3509
3510 if (STp->can_partitions && STp->ready == ST_READY &&
3511 (i = switch_partition(STp)) < 0) {
3512 retval = i;
3513 goto out;
3514 }
3515
3516 if (mtc.mt_op == MTCOMPRESSION)
3517 retval = st_compression(STp, (mtc.mt_count & 1));
3518 else
3519 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3520 goto out;
3521 }
3522 if (!STm->defined) {
3523 retval = (-ENXIO);
3524 goto out;
3525 }
3526
3527 if ((i = flush_buffer(STp, 0)) < 0) {
3528 retval = i;
3529 goto out;
3530 }
3531 if (STp->can_partitions &&
3532 (i = switch_partition(STp)) < 0) {
3533 retval = i;
3534 goto out;
3535 }
3536
3537 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3538 struct mtget mt_status;
3539
3540 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3541 retval = (-EINVAL);
3542 goto out;
3543 }
3544
3545 mt_status.mt_type = STp->tape_type;
3546 mt_status.mt_dsreg =
3547 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3548 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3549 mt_status.mt_blkno = STps->drv_block;
3550 mt_status.mt_fileno = STps->drv_file;
3551 if (STp->block_size != 0) {
3552 if (STps->rw == ST_WRITING)
3553 mt_status.mt_blkno +=
3554 (STp->buffer)->buffer_bytes / STp->block_size;
3555 else if (STps->rw == ST_READING)
3556 mt_status.mt_blkno -=
3557 ((STp->buffer)->buffer_bytes +
3558 STp->block_size - 1) / STp->block_size;
3559 }
3560
3561 mt_status.mt_gstat = 0;
3562 if (STp->drv_write_prot)
3563 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3564 if (mt_status.mt_blkno == 0) {
3565 if (mt_status.mt_fileno == 0)
3566 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3567 else
3568 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3569 }
3570 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3571 mt_status.mt_resid = STp->partition;
3572 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3573 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3574 else if (STps->eof >= ST_EOM_OK)
3575 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3576 if (STp->density == 1)
3577 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3578 else if (STp->density == 2)
3579 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3580 else if (STp->density == 3)
3581 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3582 if (STp->ready == ST_READY)
3583 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3584 if (STp->ready == ST_NO_TAPE)
3585 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3586 if (STps->at_sm)
3587 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3588 if (STm->do_async_writes ||
3589 (STm->do_buffer_writes && STp->block_size != 0) ||
3590 STp->drv_buffer != 0)
3591 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3592 if (STp->cleaning_req)
3593 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3594
3595 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3596 if (i) {
3597 retval = (-EFAULT);
3598 goto out;
3599 }
3600
3601 STp->recover_reg = 0; /* Clear after read */
3602 retval = 0;
3603 goto out;
3604 } /* End of MTIOCGET */
3605 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3606 struct mtpos mt_pos;
3607 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3608 retval = (-EINVAL);
3609 goto out;
3610 }
3611 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3612 retval = i;
3613 goto out;
3614 }
3615 mt_pos.mt_blkno = blk;
3616 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3617 if (i)
3618 retval = (-EFAULT);
3619 goto out;
3620 }
3621 mutex_unlock(&STp->lock);
3622 switch (cmd_in) {
3623 case SCSI_IOCTL_GET_IDLUN:
3624 case SCSI_IOCTL_GET_BUS_NUMBER:
3625 break;
3626 default:
3627 if ((cmd_in == SG_IO ||
3628 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3629 cmd_in == CDROM_SEND_PACKET) &&
3630 !capable(CAP_SYS_RAWIO))
3631 i = -EPERM;
3632 else
3633 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3634 file->f_mode, cmd_in, p);
3635 if (i != -ENOTTY)
3636 return i;
3637 break;
3638 }
3639 retval = scsi_ioctl(STp->device, cmd_in, p);
3640 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3641 STp->rew_at_close = 0;
3642 STp->ready = ST_NO_TAPE;
3643 }
3644 return retval;
3645
3646 out:
3647 mutex_unlock(&STp->lock);
3648 return retval;
3649 }
3650
3651 #ifdef CONFIG_COMPAT
3652 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3653 {
3654 struct scsi_tape *STp = file->private_data;
3655 struct scsi_device *sdev = STp->device;
3656 int ret = -ENOIOCTLCMD;
3657 if (sdev->host->hostt->compat_ioctl) {
3658
3659 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3660
3661 }
3662 return ret;
3663 }
3664 #endif
3665
3666 \f
3667
3668 /* Try to allocate a new tape buffer. Calling function must not hold
3669 dev_arr_lock. */
3670 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3671 {
3672 struct st_buffer *tb;
3673
3674 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3675 if (!tb) {
3676 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3677 return NULL;
3678 }
3679 tb->frp_segs = 0;
3680 tb->use_sg = max_sg;
3681 tb->dma = need_dma;
3682 tb->buffer_size = 0;
3683
3684 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3685 GFP_ATOMIC);
3686 if (!tb->reserved_pages) {
3687 kfree(tb);
3688 return NULL;
3689 }
3690
3691 return tb;
3692 }
3693
3694
3695 /* Try to allocate enough space in the tape buffer */
3696 #define ST_MAX_ORDER 6
3697
3698 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3699 {
3700 int segs, nbr, max_segs, b_size, order, got;
3701 gfp_t priority;
3702
3703 if (new_size <= STbuffer->buffer_size)
3704 return 1;
3705
3706 if (STbuffer->buffer_size <= PAGE_SIZE)
3707 normalize_buffer(STbuffer); /* Avoid extra segment */
3708
3709 max_segs = STbuffer->use_sg;
3710 nbr = max_segs - STbuffer->frp_segs;
3711 if (nbr <= 0)
3712 return 0;
3713
3714 priority = GFP_KERNEL | __GFP_NOWARN;
3715 if (need_dma)
3716 priority |= GFP_DMA;
3717
3718 if (STbuffer->cleared)
3719 priority |= __GFP_ZERO;
3720
3721 if (STbuffer->frp_segs) {
3722 order = STbuffer->map_data.page_order;
3723 b_size = PAGE_SIZE << order;
3724 } else {
3725 for (b_size = PAGE_SIZE, order = 0;
3726 order < ST_MAX_ORDER && b_size < new_size;
3727 order++, b_size *= 2)
3728 ; /* empty */
3729 }
3730 if (max_segs * (PAGE_SIZE << order) < new_size) {
3731 if (order == ST_MAX_ORDER)
3732 return 0;
3733 normalize_buffer(STbuffer);
3734 return enlarge_buffer(STbuffer, new_size, need_dma);
3735 }
3736
3737 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3738 segs < max_segs && got < new_size;) {
3739 struct page *page;
3740
3741 page = alloc_pages(priority, order);
3742 if (!page) {
3743 DEB(STbuffer->buffer_size = got);
3744 normalize_buffer(STbuffer);
3745 return 0;
3746 }
3747
3748 STbuffer->frp_segs += 1;
3749 got += b_size;
3750 STbuffer->buffer_size = got;
3751 STbuffer->reserved_pages[segs] = page;
3752 segs++;
3753 }
3754 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3755 STbuffer->map_data.page_order = order;
3756
3757 return 1;
3758 }
3759
3760
3761 /* Make sure that no data from previous user is in the internal buffer */
3762 static void clear_buffer(struct st_buffer * st_bp)
3763 {
3764 int i;
3765
3766 for (i=0; i < st_bp->frp_segs; i++)
3767 memset(page_address(st_bp->reserved_pages[i]), 0,
3768 PAGE_SIZE << st_bp->map_data.page_order);
3769 st_bp->cleared = 1;
3770 }
3771
3772
3773 /* Release the extra buffer */
3774 static void normalize_buffer(struct st_buffer * STbuffer)
3775 {
3776 int i, order = STbuffer->map_data.page_order;
3777
3778 for (i = 0; i < STbuffer->frp_segs; i++) {
3779 __free_pages(STbuffer->reserved_pages[i], order);
3780 STbuffer->buffer_size -= (PAGE_SIZE << order);
3781 }
3782 STbuffer->frp_segs = 0;
3783 STbuffer->sg_segs = 0;
3784 STbuffer->map_data.page_order = 0;
3785 STbuffer->map_data.offset = 0;
3786 }
3787
3788
3789 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3790 negative error code. */
3791 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3792 {
3793 int i, cnt, res, offset;
3794 int length = PAGE_SIZE << st_bp->map_data.page_order;
3795
3796 for (i = 0, offset = st_bp->buffer_bytes;
3797 i < st_bp->frp_segs && offset >= length; i++)
3798 offset -= length;
3799 if (i == st_bp->frp_segs) { /* Should never happen */
3800 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3801 return (-EIO);
3802 }
3803 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3804 struct page *page = st_bp->reserved_pages[i];
3805 cnt = length - offset < do_count ? length - offset : do_count;
3806 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3807 if (res)
3808 return (-EFAULT);
3809 do_count -= cnt;
3810 st_bp->buffer_bytes += cnt;
3811 ubp += cnt;
3812 offset = 0;
3813 }
3814 if (do_count) /* Should never happen */
3815 return (-EIO);
3816
3817 return 0;
3818 }
3819
3820
3821 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
3822 negative error code. */
3823 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3824 {
3825 int i, cnt, res, offset;
3826 int length = PAGE_SIZE << st_bp->map_data.page_order;
3827
3828 for (i = 0, offset = st_bp->read_pointer;
3829 i < st_bp->frp_segs && offset >= length; i++)
3830 offset -= length;
3831 if (i == st_bp->frp_segs) { /* Should never happen */
3832 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3833 return (-EIO);
3834 }
3835 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3836 struct page *page = st_bp->reserved_pages[i];
3837 cnt = length - offset < do_count ? length - offset : do_count;
3838 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3839 if (res)
3840 return (-EFAULT);
3841 do_count -= cnt;
3842 st_bp->buffer_bytes -= cnt;
3843 st_bp->read_pointer += cnt;
3844 ubp += cnt;
3845 offset = 0;
3846 }
3847 if (do_count) /* Should never happen */
3848 return (-EIO);
3849
3850 return 0;
3851 }
3852
3853
3854 /* Move data towards start of buffer */
3855 static void move_buffer_data(struct st_buffer * st_bp, int offset)
3856 {
3857 int src_seg, dst_seg, src_offset = 0, dst_offset;
3858 int count, total;
3859 int length = PAGE_SIZE << st_bp->map_data.page_order;
3860
3861 if (offset == 0)
3862 return;
3863
3864 total=st_bp->buffer_bytes - offset;
3865 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3866 src_offset = offset;
3867 if (src_offset < length)
3868 break;
3869 offset -= length;
3870 }
3871
3872 st_bp->buffer_bytes = st_bp->read_pointer = total;
3873 for (dst_seg=dst_offset=0; total > 0; ) {
3874 struct page *dpage = st_bp->reserved_pages[dst_seg];
3875 struct page *spage = st_bp->reserved_pages[src_seg];
3876
3877 count = min(length - dst_offset, length - src_offset);
3878 memmove(page_address(dpage) + dst_offset,
3879 page_address(spage) + src_offset, count);
3880 src_offset += count;
3881 if (src_offset >= length) {
3882 src_seg++;
3883 src_offset = 0;
3884 }
3885 dst_offset += count;
3886 if (dst_offset >= length) {
3887 dst_seg++;
3888 dst_offset = 0;
3889 }
3890 total -= count;
3891 }
3892 }
3893
3894 /* Validate the options from command line or module parameters */
3895 static void validate_options(void)
3896 {
3897 if (buffer_kbs > 0)
3898 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3899 if (max_sg_segs >= ST_FIRST_SG)
3900 st_max_sg_segs = max_sg_segs;
3901 }
3902
3903 #ifndef MODULE
3904 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3905 */
3906 static int __init st_setup(char *str)
3907 {
3908 int i, len, ints[5];
3909 char *stp;
3910
3911 stp = get_options(str, ARRAY_SIZE(ints), ints);
3912
3913 if (ints[0] > 0) {
3914 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3915 if (parms[i].val)
3916 *parms[i].val = ints[i + 1];
3917 } else {
3918 while (stp != NULL) {
3919 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3920 len = strlen(parms[i].name);
3921 if (!strncmp(stp, parms[i].name, len) &&
3922 (*(stp + len) == ':' || *(stp + len) == '=')) {
3923 if (parms[i].val)
3924 *parms[i].val =
3925 simple_strtoul(stp + len + 1, NULL, 0);
3926 else
3927 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3928 parms[i].name);
3929 break;
3930 }
3931 }
3932 if (i >= ARRAY_SIZE(parms))
3933 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3934 stp);
3935 stp = strchr(stp, ',');
3936 if (stp)
3937 stp++;
3938 }
3939 }
3940
3941 validate_options();
3942
3943 return 1;
3944 }
3945
3946 __setup("st=", st_setup);
3947
3948 #endif
3949
3950 static const struct file_operations st_fops =
3951 {
3952 .owner = THIS_MODULE,
3953 .read = st_read,
3954 .write = st_write,
3955 .unlocked_ioctl = st_ioctl,
3956 #ifdef CONFIG_COMPAT
3957 .compat_ioctl = st_compat_ioctl,
3958 #endif
3959 .open = st_open,
3960 .flush = st_flush,
3961 .release = st_release,
3962 };
3963
3964 static int st_probe(struct device *dev)
3965 {
3966 struct scsi_device *SDp = to_scsi_device(dev);
3967 struct gendisk *disk = NULL;
3968 struct cdev *cdev = NULL;
3969 struct scsi_tape *tpnt = NULL;
3970 struct st_modedef *STm;
3971 struct st_partstat *STps;
3972 struct st_buffer *buffer;
3973 int i, j, mode, dev_num, error;
3974 char *stp;
3975
3976 if (SDp->type != TYPE_TAPE)
3977 return -ENODEV;
3978 if ((stp = st_incompatible(SDp))) {
3979 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
3980 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
3981 return -ENODEV;
3982 }
3983
3984 i = min(queue_max_hw_segments(SDp->request_queue),
3985 queue_max_phys_segments(SDp->request_queue));
3986 if (st_max_sg_segs < i)
3987 i = st_max_sg_segs;
3988 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
3989 if (buffer == NULL) {
3990 printk(KERN_ERR
3991 "st: Can't allocate new tape buffer. Device not attached.\n");
3992 goto out;
3993 }
3994
3995 disk = alloc_disk(1);
3996 if (!disk) {
3997 printk(KERN_ERR "st: out of memory. Device not attached.\n");
3998 goto out_buffer_free;
3999 }
4000
4001 write_lock(&st_dev_arr_lock);
4002 if (st_nr_dev >= st_dev_max) {
4003 struct scsi_tape **tmp_da;
4004 int tmp_dev_max;
4005
4006 tmp_dev_max = max(st_nr_dev * 2, 8);
4007 if (tmp_dev_max > ST_MAX_TAPES)
4008 tmp_dev_max = ST_MAX_TAPES;
4009 if (tmp_dev_max <= st_nr_dev) {
4010 write_unlock(&st_dev_arr_lock);
4011 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4012 ST_MAX_TAPES);
4013 goto out_put_disk;
4014 }
4015
4016 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
4017 if (tmp_da == NULL) {
4018 write_unlock(&st_dev_arr_lock);
4019 printk(KERN_ERR "st: Can't extend device array.\n");
4020 goto out_put_disk;
4021 }
4022
4023 if (scsi_tapes != NULL) {
4024 memcpy(tmp_da, scsi_tapes,
4025 st_dev_max * sizeof(struct scsi_tape *));
4026 kfree(scsi_tapes);
4027 }
4028 scsi_tapes = tmp_da;
4029
4030 st_dev_max = tmp_dev_max;
4031 }
4032
4033 for (i = 0; i < st_dev_max; i++)
4034 if (scsi_tapes[i] == NULL)
4035 break;
4036 if (i >= st_dev_max)
4037 panic("scsi_devices corrupt (st)");
4038
4039 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4040 if (tpnt == NULL) {
4041 write_unlock(&st_dev_arr_lock);
4042 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4043 goto out_put_disk;
4044 }
4045 kref_init(&tpnt->kref);
4046 tpnt->disk = disk;
4047 sprintf(disk->disk_name, "st%d", i);
4048 disk->private_data = &tpnt->driver;
4049 disk->queue = SDp->request_queue;
4050 tpnt->driver = &st_template;
4051 scsi_tapes[i] = tpnt;
4052 dev_num = i;
4053
4054 tpnt->device = SDp;
4055 if (SDp->scsi_level <= 2)
4056 tpnt->tape_type = MT_ISSCSI1;
4057 else
4058 tpnt->tape_type = MT_ISSCSI2;
4059
4060 tpnt->buffer = buffer;
4061 tpnt->buffer->last_SRpnt = NULL;
4062
4063 tpnt->inited = 0;
4064 tpnt->dirty = 0;
4065 tpnt->in_use = 0;
4066 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4067 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4068 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4069 tpnt->density = 0;
4070 tpnt->do_auto_lock = ST_AUTO_LOCK;
4071 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4072 tpnt->can_partitions = 0;
4073 tpnt->two_fm = ST_TWO_FM;
4074 tpnt->fast_mteom = ST_FAST_MTEOM;
4075 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4076 tpnt->sili = ST_SILI;
4077 tpnt->immediate = ST_NOWAIT;
4078 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4079 tpnt->partition = 0;
4080 tpnt->new_partition = 0;
4081 tpnt->nbr_partitions = 0;
4082 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4083 tpnt->long_timeout = ST_LONG_TIMEOUT;
4084 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4085
4086 for (i = 0; i < ST_NBR_MODES; i++) {
4087 STm = &(tpnt->modes[i]);
4088 STm->defined = 0;
4089 STm->sysv = ST_SYSV;
4090 STm->defaults_for_writes = 0;
4091 STm->do_async_writes = ST_ASYNC_WRITES;
4092 STm->do_buffer_writes = ST_BUFFER_WRITES;
4093 STm->do_read_ahead = ST_READ_AHEAD;
4094 STm->default_compression = ST_DONT_TOUCH;
4095 STm->default_blksize = (-1); /* No forced size */
4096 STm->default_density = (-1); /* No forced density */
4097 }
4098
4099 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4100 STps = &(tpnt->ps[i]);
4101 STps->rw = ST_IDLE;
4102 STps->eof = ST_NOEOF;
4103 STps->at_sm = 0;
4104 STps->last_block_valid = 0;
4105 STps->drv_block = (-1);
4106 STps->drv_file = (-1);
4107 }
4108
4109 tpnt->current_mode = 0;
4110 tpnt->modes[0].defined = 1;
4111
4112 tpnt->density_changed = tpnt->compression_changed =
4113 tpnt->blksize_changed = 0;
4114 mutex_init(&tpnt->lock);
4115
4116 st_nr_dev++;
4117 write_unlock(&st_dev_arr_lock);
4118
4119 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4120 STm = &(tpnt->modes[mode]);
4121 for (j=0; j < 2; j++) {
4122 cdev = cdev_alloc();
4123 if (!cdev) {
4124 printk(KERN_ERR
4125 "st%d: out of memory. Device not attached.\n",
4126 dev_num);
4127 goto out_free_tape;
4128 }
4129 cdev->owner = THIS_MODULE;
4130 cdev->ops = &st_fops;
4131
4132 error = cdev_add(cdev,
4133 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4134 1);
4135 if (error) {
4136 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4137 dev_num, j ? "non" : "auto", mode);
4138 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4139 goto out_free_tape;
4140 }
4141 STm->cdevs[j] = cdev;
4142
4143 }
4144 error = do_create_class_files(tpnt, dev_num, mode);
4145 if (error)
4146 goto out_free_tape;
4147 }
4148
4149 sdev_printk(KERN_NOTICE, SDp,
4150 "Attached scsi tape %s\n", tape_name(tpnt));
4151 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4152 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4153 queue_dma_alignment(SDp->request_queue) + 1);
4154
4155 return 0;
4156
4157 out_free_tape:
4158 for (mode=0; mode < ST_NBR_MODES; mode++) {
4159 STm = &(tpnt->modes[mode]);
4160 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4161 "tape");
4162 for (j=0; j < 2; j++) {
4163 if (STm->cdevs[j]) {
4164 if (cdev == STm->cdevs[j])
4165 cdev = NULL;
4166 device_destroy(st_sysfs_class,
4167 MKDEV(SCSI_TAPE_MAJOR,
4168 TAPE_MINOR(i, mode, j)));
4169 cdev_del(STm->cdevs[j]);
4170 }
4171 }
4172 }
4173 if (cdev)
4174 cdev_del(cdev);
4175 write_lock(&st_dev_arr_lock);
4176 scsi_tapes[dev_num] = NULL;
4177 st_nr_dev--;
4178 write_unlock(&st_dev_arr_lock);
4179 out_put_disk:
4180 put_disk(disk);
4181 kfree(tpnt);
4182 out_buffer_free:
4183 kfree(buffer);
4184 out:
4185 return -ENODEV;
4186 };
4187
4188
4189 static int st_remove(struct device *dev)
4190 {
4191 struct scsi_device *SDp = to_scsi_device(dev);
4192 struct scsi_tape *tpnt;
4193 int i, j, mode;
4194
4195 write_lock(&st_dev_arr_lock);
4196 for (i = 0; i < st_dev_max; i++) {
4197 tpnt = scsi_tapes[i];
4198 if (tpnt != NULL && tpnt->device == SDp) {
4199 scsi_tapes[i] = NULL;
4200 st_nr_dev--;
4201 write_unlock(&st_dev_arr_lock);
4202 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4203 "tape");
4204 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4205 for (j=0; j < 2; j++) {
4206 device_destroy(st_sysfs_class,
4207 MKDEV(SCSI_TAPE_MAJOR,
4208 TAPE_MINOR(i, mode, j)));
4209 cdev_del(tpnt->modes[mode].cdevs[j]);
4210 tpnt->modes[mode].cdevs[j] = NULL;
4211 }
4212 }
4213
4214 mutex_lock(&st_ref_mutex);
4215 kref_put(&tpnt->kref, scsi_tape_release);
4216 mutex_unlock(&st_ref_mutex);
4217 return 0;
4218 }
4219 }
4220
4221 write_unlock(&st_dev_arr_lock);
4222 return 0;
4223 }
4224
4225 /**
4226 * scsi_tape_release - Called to free the Scsi_Tape structure
4227 * @kref: pointer to embedded kref
4228 *
4229 * st_ref_mutex must be held entering this routine. Because it is
4230 * called on last put, you should always use the scsi_tape_get()
4231 * scsi_tape_put() helpers which manipulate the semaphore directly
4232 * and never do a direct kref_put().
4233 **/
4234 static void scsi_tape_release(struct kref *kref)
4235 {
4236 struct scsi_tape *tpnt = to_scsi_tape(kref);
4237 struct gendisk *disk = tpnt->disk;
4238
4239 tpnt->device = NULL;
4240
4241 if (tpnt->buffer) {
4242 normalize_buffer(tpnt->buffer);
4243 kfree(tpnt->buffer->reserved_pages);
4244 kfree(tpnt->buffer);
4245 }
4246
4247 disk->private_data = NULL;
4248 put_disk(disk);
4249 kfree(tpnt);
4250 return;
4251 }
4252
4253 static int __init init_st(void)
4254 {
4255 int err;
4256
4257 validate_options();
4258
4259 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4260 verstr, st_fixed_buffer_size, st_max_sg_segs);
4261
4262 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
4263 if (IS_ERR(st_sysfs_class)) {
4264 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
4265 return PTR_ERR(st_sysfs_class);
4266 }
4267
4268 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4269 ST_MAX_TAPE_ENTRIES, "st");
4270 if (err) {
4271 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4272 SCSI_TAPE_MAJOR);
4273 goto err_class;
4274 }
4275
4276 err = scsi_register_driver(&st_template.gendrv);
4277 if (err)
4278 goto err_chrdev;
4279
4280 err = do_create_sysfs_files();
4281 if (err)
4282 goto err_scsidrv;
4283
4284 return 0;
4285
4286 err_scsidrv:
4287 scsi_unregister_driver(&st_template.gendrv);
4288 err_chrdev:
4289 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4290 ST_MAX_TAPE_ENTRIES);
4291 err_class:
4292 class_destroy(st_sysfs_class);
4293 return err;
4294 }
4295
4296 static void __exit exit_st(void)
4297 {
4298 do_remove_sysfs_files();
4299 scsi_unregister_driver(&st_template.gendrv);
4300 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4301 ST_MAX_TAPE_ENTRIES);
4302 class_destroy(st_sysfs_class);
4303 kfree(scsi_tapes);
4304 printk(KERN_INFO "st: Unloaded.\n");
4305 }
4306
4307 module_init(init_st);
4308 module_exit(exit_st);
4309
4310
4311 /* The sysfs driver interface. Read-only at the moment */
4312 static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4313 {
4314 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4315 }
4316 static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4317
4318 static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4319 {
4320 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4321 }
4322 static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4323
4324 static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4325 {
4326 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4327 }
4328 static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4329
4330 static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4331 {
4332 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4333 }
4334 static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4335
4336 static int do_create_sysfs_files(void)
4337 {
4338 struct device_driver *sysfs = &st_template.gendrv;
4339 int err;
4340
4341 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4342 if (err)
4343 return err;
4344 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4345 if (err)
4346 goto err_try_direct_io;
4347 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4348 if (err)
4349 goto err_attr_fixed_buf;
4350 err = driver_create_file(sysfs, &driver_attr_version);
4351 if (err)
4352 goto err_attr_max_sg;
4353
4354 return 0;
4355
4356 err_attr_max_sg:
4357 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4358 err_attr_fixed_buf:
4359 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4360 err_try_direct_io:
4361 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4362 return err;
4363 }
4364
4365 static void do_remove_sysfs_files(void)
4366 {
4367 struct device_driver *sysfs = &st_template.gendrv;
4368
4369 driver_remove_file(sysfs, &driver_attr_version);
4370 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4371 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4372 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4373 }
4374
4375
4376 /* The sysfs simple class interface */
4377 static ssize_t
4378 st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4379 {
4380 struct st_modedef *STm = dev_get_drvdata(dev);
4381 ssize_t l = 0;
4382
4383 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4384 return l;
4385 }
4386
4387 DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
4388
4389 static ssize_t
4390 st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
4391 {
4392 struct st_modedef *STm = dev_get_drvdata(dev);
4393 ssize_t l = 0;
4394
4395 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4396 return l;
4397 }
4398
4399 DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
4400
4401 static ssize_t
4402 st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
4403 {
4404 struct st_modedef *STm = dev_get_drvdata(dev);
4405 ssize_t l = 0;
4406 char *fmt;
4407
4408 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4409 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4410 return l;
4411 }
4412
4413 DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
4414
4415 static ssize_t
4416 st_defcompression_show(struct device *dev, struct device_attribute *attr,
4417 char *buf)
4418 {
4419 struct st_modedef *STm = dev_get_drvdata(dev);
4420 ssize_t l = 0;
4421
4422 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4423 return l;
4424 }
4425
4426 DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
4427
4428 static ssize_t
4429 st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
4430 {
4431 struct st_modedef *STm = dev_get_drvdata(dev);
4432 struct scsi_tape *STp;
4433 int i, j, options;
4434 ssize_t l = 0;
4435
4436 for (i=0; i < st_dev_max; i++) {
4437 for (j=0; j < ST_NBR_MODES; j++)
4438 if (&scsi_tapes[i]->modes[j] == STm)
4439 break;
4440 if (j < ST_NBR_MODES)
4441 break;
4442 }
4443 if (i == st_dev_max)
4444 return 0; /* should never happen */
4445
4446 STp = scsi_tapes[i];
4447
4448 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4449 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4450 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4451 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4452 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4453 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4454 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4455 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4456 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4457 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4458 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4459 options |= STm->sysv ? MT_ST_SYSV : 0;
4460 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4461 options |= STp->sili ? MT_ST_SILI : 0;
4462
4463 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4464 return l;
4465 }
4466
4467 DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
4468
4469 static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
4470 {
4471 int i, rew, error;
4472 char name[10];
4473 struct device *st_class_member;
4474
4475 for (rew=0; rew < 2; rew++) {
4476 /* Make sure that the minor numbers corresponding to the four
4477 first modes always get the same names */
4478 i = mode << (4 - ST_NBR_MODE_BITS);
4479 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4480 STp->disk->disk_name, st_formats[i]);
4481 st_class_member =
4482 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4483 MKDEV(SCSI_TAPE_MAJOR,
4484 TAPE_MINOR(dev_num, mode, rew)),
4485 &STp->modes[mode], "%s", name);
4486 if (IS_ERR(st_class_member)) {
4487 printk(KERN_WARNING "st%d: device_create failed\n",
4488 dev_num);
4489 error = PTR_ERR(st_class_member);
4490 goto out;
4491 }
4492
4493 error = device_create_file(st_class_member,
4494 &dev_attr_defined);
4495 if (error) goto out;
4496 error = device_create_file(st_class_member,
4497 &dev_attr_default_blksize);
4498 if (error) goto out;
4499 error = device_create_file(st_class_member,
4500 &dev_attr_default_density);
4501 if (error) goto out;
4502 error = device_create_file(st_class_member,
4503 &dev_attr_default_compression);
4504 if (error) goto out;
4505 error = device_create_file(st_class_member,
4506 &dev_attr_options);
4507 if (error) goto out;
4508
4509 if (mode == 0 && rew == 0) {
4510 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4511 &st_class_member->kobj,
4512 "tape");
4513 if (error) {
4514 printk(KERN_ERR
4515 "st%d: Can't create sysfs link from SCSI device.\n",
4516 dev_num);
4517 goto out;
4518 }
4519 }
4520 }
4521
4522 return 0;
4523
4524 out:
4525 return error;
4526 }
4527
4528 /* The following functions may be useful for a larger audience. */
4529 static int sgl_map_user_pages(struct st_buffer *STbp,
4530 const unsigned int max_pages, unsigned long uaddr,
4531 size_t count, int rw)
4532 {
4533 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4534 unsigned long start = uaddr >> PAGE_SHIFT;
4535 const int nr_pages = end - start;
4536 int res, i, j;
4537 struct page **pages;
4538 struct rq_map_data *mdata = &STbp->map_data;
4539
4540 /* User attempted Overflow! */
4541 if ((uaddr + count) < uaddr)
4542 return -EINVAL;
4543
4544 /* Too big */
4545 if (nr_pages > max_pages)
4546 return -ENOMEM;
4547
4548 /* Hmm? */
4549 if (count == 0)
4550 return 0;
4551
4552 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4553 return -ENOMEM;
4554
4555 /* Try to fault in all of the necessary pages */
4556 down_read(&current->mm->mmap_sem);
4557 /* rw==READ means read from drive, write into memory area */
4558 res = get_user_pages(
4559 current,
4560 current->mm,
4561 uaddr,
4562 nr_pages,
4563 rw == READ,
4564 0, /* don't force */
4565 pages,
4566 NULL);
4567 up_read(&current->mm->mmap_sem);
4568
4569 /* Errors and no page mapped should return here */
4570 if (res < nr_pages)
4571 goto out_unmap;
4572
4573 for (i=0; i < nr_pages; i++) {
4574 /* FIXME: flush superflous for rw==READ,
4575 * probably wrong function for rw==WRITE
4576 */
4577 flush_dcache_page(pages[i]);
4578 }
4579
4580 mdata->offset = uaddr & ~PAGE_MASK;
4581 mdata->page_order = 0;
4582 STbp->mapped_pages = pages;
4583
4584 return nr_pages;
4585 out_unmap:
4586 if (res > 0) {
4587 for (j=0; j < res; j++)
4588 page_cache_release(pages[j]);
4589 res = 0;
4590 }
4591 kfree(pages);
4592 return res;
4593 }
4594
4595
4596 /* And unmap them... */
4597 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4598 const unsigned int nr_pages, int dirtied)
4599 {
4600 int i;
4601
4602 for (i=0; i < nr_pages; i++) {
4603 struct page *page = STbp->mapped_pages[i];
4604
4605 if (dirtied)
4606 SetPageDirty(page);
4607 /* FIXME: cache flush missing for rw==READ
4608 * FIXME: call the correct reference counting function
4609 */
4610 page_cache_release(page);
4611 }
4612 kfree(STbp->mapped_pages);
4613 STbp->mapped_pages = NULL;
4614
4615 return 0;
4616 }
mm of the moment repository