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writeback: Add tracing to balance_dirty_pages
[linux-2.6/next.git] / drivers / scsi / st.c
blob24211d0efa6d5d82557dac4e6047c3b9efc25c3f
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/slab.h>
31 #include <linux/errno.h>
32 #include <linux/mtio.h>
33 #include <linux/cdrom.h>
34 #include <linux/ioctl.h>
35 #include <linux/fcntl.h>
36 #include <linux/spinlock.h>
37 #include <linux/blkdev.h>
38 #include <linux/moduleparam.h>
39 #include <linux/cdev.h>
40 #include <linux/delay.h>
41 #include <linux/mutex.h>
42 #include <linux/smp_lock.h>
43
44 #include <asm/uaccess.h>
45 #include <asm/dma.h>
46 #include <asm/system.h>
47
48 #include <scsi/scsi.h>
49 #include <scsi/scsi_dbg.h>
50 #include <scsi/scsi_device.h>
51 #include <scsi/scsi_driver.h>
52 #include <scsi/scsi_eh.h>
53 #include <scsi/scsi_host.h>
54 #include <scsi/scsi_ioctl.h>
55 #include <scsi/sg.h>
56
57
58 /* The driver prints some debugging information on the console if DEBUG
59 is defined and non-zero. */
60 #define DEBUG 0
61
62 #if DEBUG
63 /* The message level for the debug messages is currently set to KERN_NOTICE
64 so that people can easily see the messages. Later when the debugging messages
65 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
66 #define ST_DEB_MSG KERN_NOTICE
67 #define DEB(a) a
68 #define DEBC(a) if (debugging) { a ; }
69 #else
70 #define DEB(a)
71 #define DEBC(a)
72 #endif
73
74 #define ST_KILOBYTE 1024
75
76 #include "st_options.h"
77 #include "st.h"
78
79 static int buffer_kbs;
80 static int max_sg_segs;
81 static int try_direct_io = TRY_DIRECT_IO;
82 static int try_rdio = 1;
83 static int try_wdio = 1;
84
85 static int st_dev_max;
86 static int st_nr_dev;
87
88 static struct class *st_sysfs_class;
89
90 MODULE_AUTHOR("Kai Makisara");
91 MODULE_DESCRIPTION("SCSI tape (st) driver");
92 MODULE_LICENSE("GPL");
93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
95
96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100 module_param_named(buffer_kbs, buffer_kbs, int, 0);
101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102 module_param_named(max_sg_segs, max_sg_segs, int, 0);
103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104 module_param_named(try_direct_io, try_direct_io, int, 0);
105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106
107 /* Extra parameters for testing */
108 module_param_named(try_rdio, try_rdio, int, 0);
109 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
110 module_param_named(try_wdio, try_wdio, int, 0);
111 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
112
113 #ifndef MODULE
114 static int write_threshold_kbs; /* retained for compatibility */
115 static struct st_dev_parm {
116 char *name;
117 int *val;
118 } parms[] __initdata = {
119 {
120 "buffer_kbs", &buffer_kbs
121 },
122 { /* Retained for compatibility with 2.4 */
123 "write_threshold_kbs", &write_threshold_kbs
124 },
125 {
126 "max_sg_segs", NULL
127 },
128 {
129 "try_direct_io", &try_direct_io
130 }
131 };
132 #endif
133
134 /* Restrict the number of modes so that names for all are assigned */
135 #if ST_NBR_MODES > 16
136 #error "Maximum number of modes is 16"
137 #endif
138 /* Bit reversed order to get same names for same minors with all
139 mode counts */
140 static const char *st_formats[] = {
141 "", "r", "k", "s", "l", "t", "o", "u",
142 "m", "v", "p", "x", "a", "y", "q", "z"};
143
144 /* The default definitions have been moved to st_options.h */
145
146 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
147
148 /* The buffer size should fit into the 24 bits for length in the
149 6-byte SCSI read and write commands. */
150 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
151 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
152 #endif
153
154 static int debugging = DEBUG;
155
156 #define MAX_RETRIES 0
157 #define MAX_WRITE_RETRIES 0
158 #define MAX_READY_RETRIES 0
159 #define NO_TAPE NOT_READY
160
161 #define ST_TIMEOUT (900 * HZ)
162 #define ST_LONG_TIMEOUT (14000 * HZ)
163
164 /* Remove mode bits and auto-rewind bit (7) */
165 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
166 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
167 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
168
169 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
170 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
171 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
172
173 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
174 24 bits) */
175 #define SET_DENS_AND_BLK 0x10001
176
177 static DEFINE_RWLOCK(st_dev_arr_lock);
178
179 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
180 static int st_max_sg_segs = ST_MAX_SG;
181
182 static struct scsi_tape **scsi_tapes = NULL;
183
184 static int modes_defined;
185
186 static int enlarge_buffer(struct st_buffer *, int, int);
187 static void clear_buffer(struct st_buffer *);
188 static void normalize_buffer(struct st_buffer *);
189 static int append_to_buffer(const char __user *, struct st_buffer *, int);
190 static int from_buffer(struct st_buffer *, char __user *, int);
191 static void move_buffer_data(struct st_buffer *, int);
192
193 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
194 unsigned long, size_t, int);
195 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
196
197 static int st_probe(struct device *);
198 static int st_remove(struct device *);
199
200 static int do_create_sysfs_files(void);
201 static void do_remove_sysfs_files(void);
202 static int do_create_class_files(struct scsi_tape *, int, int);
203
204 static struct scsi_driver st_template = {
205 .owner = THIS_MODULE,
206 .gendrv = {
207 .name = "st",
208 .probe = st_probe,
209 .remove = st_remove,
210 },
211 };
212
213 static int st_compression(struct scsi_tape *, int);
214
215 static int find_partition(struct scsi_tape *);
216 static int switch_partition(struct scsi_tape *);
217
218 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
219
220 static void scsi_tape_release(struct kref *);
221
222 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
223
224 static DEFINE_MUTEX(st_ref_mutex);
225
226 \f
227 #include "osst_detect.h"
228 #ifndef SIGS_FROM_OSST
229 #define SIGS_FROM_OSST \
230 {"OnStream", "SC-", "", "osst"}, \
231 {"OnStream", "DI-", "", "osst"}, \
232 {"OnStream", "DP-", "", "osst"}, \
233 {"OnStream", "USB", "", "osst"}, \
234 {"OnStream", "FW-", "", "osst"}
235 #endif
236
237 static struct scsi_tape *scsi_tape_get(int dev)
238 {
239 struct scsi_tape *STp = NULL;
240
241 mutex_lock(&st_ref_mutex);
242 write_lock(&st_dev_arr_lock);
243
244 if (dev < st_dev_max && scsi_tapes != NULL)
245 STp = scsi_tapes[dev];
246 if (!STp) goto out;
247
248 kref_get(&STp->kref);
249
250 if (!STp->device)
251 goto out_put;
252
253 if (scsi_device_get(STp->device))
254 goto out_put;
255
256 goto out;
257
258 out_put:
259 kref_put(&STp->kref, scsi_tape_release);
260 STp = NULL;
261 out:
262 write_unlock(&st_dev_arr_lock);
263 mutex_unlock(&st_ref_mutex);
264 return STp;
265 }
266
267 static void scsi_tape_put(struct scsi_tape *STp)
268 {
269 struct scsi_device *sdev = STp->device;
270
271 mutex_lock(&st_ref_mutex);
272 kref_put(&STp->kref, scsi_tape_release);
273 scsi_device_put(sdev);
274 mutex_unlock(&st_ref_mutex);
275 }
276
277 struct st_reject_data {
278 char *vendor;
279 char *model;
280 char *rev;
281 char *driver_hint; /* Name of the correct driver, NULL if unknown */
282 };
283
284 static struct st_reject_data reject_list[] = {
285 /* {"XXX", "Yy-", "", NULL}, example */
286 SIGS_FROM_OSST,
287 {NULL, }};
288
289 /* If the device signature is on the list of incompatible drives, the
290 function returns a pointer to the name of the correct driver (if known) */
291 static char * st_incompatible(struct scsi_device* SDp)
292 {
293 struct st_reject_data *rp;
294
295 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
296 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
297 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
298 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
299 if (rp->driver_hint)
300 return rp->driver_hint;
301 else
302 return "unknown";
303 }
304 return NULL;
305 }
306 \f
307
308 static inline char *tape_name(struct scsi_tape *tape)
309 {
310 return tape->disk->disk_name;
311 }
312
313
314 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
315 {
316 const u8 *ucp;
317 const u8 *sense = SRpnt->sense;
318
319 s->have_sense = scsi_normalize_sense(SRpnt->sense,
320 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
321 s->flags = 0;
322
323 if (s->have_sense) {
324 s->deferred = 0;
325 s->remainder_valid =
326 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
327 switch (sense[0] & 0x7f) {
328 case 0x71:
329 s->deferred = 1;
330 case 0x70:
331 s->fixed_format = 1;
332 s->flags = sense[2] & 0xe0;
333 break;
334 case 0x73:
335 s->deferred = 1;
336 case 0x72:
337 s->fixed_format = 0;
338 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
339 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
340 break;
341 }
342 }
343 }
344
345
346 /* Convert the result to success code */
347 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
348 {
349 int result = SRpnt->result;
350 u8 scode;
351 DEB(const char *stp;)
352 char *name = tape_name(STp);
353 struct st_cmdstatus *cmdstatp;
354
355 if (!result)
356 return 0;
357
358 cmdstatp = &STp->buffer->cmdstat;
359 st_analyze_sense(SRpnt, cmdstatp);
360
361 if (cmdstatp->have_sense)
362 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
363 else
364 scode = 0;
365
366 DEB(
367 if (debugging) {
368 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
369 name, result,
370 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
371 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
372 if (cmdstatp->have_sense)
373 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
374 } ) /* end DEB */
375 if (!debugging) { /* Abnormal conditions for tape */
376 if (!cmdstatp->have_sense)
377 printk(KERN_WARNING
378 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
379 name, result, driver_byte(result),
380 host_byte(result));
381 else if (cmdstatp->have_sense &&
382 scode != NO_SENSE &&
383 scode != RECOVERED_ERROR &&
384 /* scode != UNIT_ATTENTION && */
385 scode != BLANK_CHECK &&
386 scode != VOLUME_OVERFLOW &&
387 SRpnt->cmd[0] != MODE_SENSE &&
388 SRpnt->cmd[0] != TEST_UNIT_READY) {
389
390 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
391 }
392 }
393
394 if (cmdstatp->fixed_format &&
395 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
396 if (STp->cln_sense_value)
397 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
398 STp->cln_sense_mask) == STp->cln_sense_value);
399 else
400 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
401 STp->cln_sense_mask) != 0);
402 }
403 if (cmdstatp->have_sense &&
404 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
405 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
406
407 STp->pos_unknown |= STp->device->was_reset;
408
409 if (cmdstatp->have_sense &&
410 scode == RECOVERED_ERROR
411 #if ST_RECOVERED_WRITE_FATAL
412 && SRpnt->cmd[0] != WRITE_6
413 && SRpnt->cmd[0] != WRITE_FILEMARKS
414 #endif
415 ) {
416 STp->recover_count++;
417 STp->recover_reg++;
418
419 DEB(
420 if (debugging) {
421 if (SRpnt->cmd[0] == READ_6)
422 stp = "read";
423 else if (SRpnt->cmd[0] == WRITE_6)
424 stp = "write";
425 else
426 stp = "ioctl";
427 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
428 STp->recover_count);
429 } ) /* end DEB */
430
431 if (cmdstatp->flags == 0)
432 return 0;
433 }
434 return (-EIO);
435 }
436
437 static struct st_request *st_allocate_request(struct scsi_tape *stp)
438 {
439 struct st_request *streq;
440
441 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
442 if (streq)
443 streq->stp = stp;
444 else {
445 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
446 tape_name(stp)););
447 if (signal_pending(current))
448 stp->buffer->syscall_result = -EINTR;
449 else
450 stp->buffer->syscall_result = -EBUSY;
451 }
452
453 return streq;
454 }
455
456 static void st_release_request(struct st_request *streq)
457 {
458 kfree(streq);
459 }
460
461 static void st_scsi_execute_end(struct request *req, int uptodate)
462 {
463 struct st_request *SRpnt = req->end_io_data;
464 struct scsi_tape *STp = SRpnt->stp;
465
466 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
467 STp->buffer->cmdstat.residual = req->resid_len;
468
469 if (SRpnt->waiting)
470 complete(SRpnt->waiting);
471
472 blk_rq_unmap_user(SRpnt->bio);
473 __blk_put_request(req->q, req);
474 }
475
476 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
477 int data_direction, void *buffer, unsigned bufflen,
478 int timeout, int retries)
479 {
480 struct request *req;
481 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
482 int err = 0;
483 int write = (data_direction == DMA_TO_DEVICE);
484
485 req = blk_get_request(SRpnt->stp->device->request_queue, write,
486 GFP_KERNEL);
487 if (!req)
488 return DRIVER_ERROR << 24;
489
490 req->cmd_type = REQ_TYPE_BLOCK_PC;
491 req->cmd_flags |= REQ_QUIET;
492
493 mdata->null_mapped = 1;
494
495 if (bufflen) {
496 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
497 GFP_KERNEL);
498 if (err) {
499 blk_put_request(req);
500 return DRIVER_ERROR << 24;
501 }
502 }
503
504 SRpnt->bio = req->bio;
505 req->cmd_len = COMMAND_SIZE(cmd[0]);
506 memset(req->cmd, 0, BLK_MAX_CDB);
507 memcpy(req->cmd, cmd, req->cmd_len);
508 req->sense = SRpnt->sense;
509 req->sense_len = 0;
510 req->timeout = timeout;
511 req->retries = retries;
512 req->end_io_data = SRpnt;
513
514 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
515 return 0;
516 }
517
518 /* Do the scsi command. Waits until command performed if do_wait is true.
519 Otherwise write_behind_check() is used to check that the command
520 has finished. */
521 static struct st_request *
522 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
523 int bytes, int direction, int timeout, int retries, int do_wait)
524 {
525 struct completion *waiting;
526 struct rq_map_data *mdata = &STp->buffer->map_data;
527 int ret;
528
529 /* if async, make sure there's no command outstanding */
530 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
531 printk(KERN_ERR "%s: Async command already active.\n",
532 tape_name(STp));
533 if (signal_pending(current))
534 (STp->buffer)->syscall_result = (-EINTR);
535 else
536 (STp->buffer)->syscall_result = (-EBUSY);
537 return NULL;
538 }
539
540 if (!SRpnt) {
541 SRpnt = st_allocate_request(STp);
542 if (!SRpnt)
543 return NULL;
544 }
545
546 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
547 which IO is outstanding. It's nulled out when the IO completes. */
548 if (!do_wait)
549 (STp->buffer)->last_SRpnt = SRpnt;
550
551 waiting = &STp->wait;
552 init_completion(waiting);
553 SRpnt->waiting = waiting;
554
555 if (STp->buffer->do_dio) {
556 mdata->page_order = 0;
557 mdata->nr_entries = STp->buffer->sg_segs;
558 mdata->pages = STp->buffer->mapped_pages;
559 } else {
560 mdata->page_order = STp->buffer->reserved_page_order;
561 mdata->nr_entries =
562 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
563 mdata->pages = STp->buffer->reserved_pages;
564 mdata->offset = 0;
565 }
566
567 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
568 STp->buffer->cmdstat.have_sense = 0;
569 STp->buffer->syscall_result = 0;
570
571 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
572 retries);
573 if (ret) {
574 /* could not allocate the buffer or request was too large */
575 (STp->buffer)->syscall_result = (-EBUSY);
576 (STp->buffer)->last_SRpnt = NULL;
577 } else if (do_wait) {
578 wait_for_completion(waiting);
579 SRpnt->waiting = NULL;
580 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
581 }
582
583 return SRpnt;
584 }
585
586
587 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
588 write has been correct but EOM early warning reached, -EIO if write ended in
589 error or zero if write successful. Asynchronous writes are used only in
590 variable block mode. */
591 static int write_behind_check(struct scsi_tape * STp)
592 {
593 int retval = 0;
594 struct st_buffer *STbuffer;
595 struct st_partstat *STps;
596 struct st_cmdstatus *cmdstatp;
597 struct st_request *SRpnt;
598
599 STbuffer = STp->buffer;
600 if (!STbuffer->writing)
601 return 0;
602
603 DEB(
604 if (STp->write_pending)
605 STp->nbr_waits++;
606 else
607 STp->nbr_finished++;
608 ) /* end DEB */
609
610 wait_for_completion(&(STp->wait));
611 SRpnt = STbuffer->last_SRpnt;
612 STbuffer->last_SRpnt = NULL;
613 SRpnt->waiting = NULL;
614
615 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
616 st_release_request(SRpnt);
617
618 STbuffer->buffer_bytes -= STbuffer->writing;
619 STps = &(STp->ps[STp->partition]);
620 if (STps->drv_block >= 0) {
621 if (STp->block_size == 0)
622 STps->drv_block++;
623 else
624 STps->drv_block += STbuffer->writing / STp->block_size;
625 }
626
627 cmdstatp = &STbuffer->cmdstat;
628 if (STbuffer->syscall_result) {
629 retval = -EIO;
630 if (cmdstatp->have_sense && !cmdstatp->deferred &&
631 (cmdstatp->flags & SENSE_EOM) &&
632 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
633 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
634 /* EOM at write-behind, has all data been written? */
635 if (!cmdstatp->remainder_valid ||
636 cmdstatp->uremainder64 == 0)
637 retval = -ENOSPC;
638 }
639 if (retval == -EIO)
640 STps->drv_block = -1;
641 }
642 STbuffer->writing = 0;
643
644 DEB(if (debugging && retval)
645 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
646 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
647
648 return retval;
649 }
650
651
652 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
653 it messes up the block number). */
654 static int cross_eof(struct scsi_tape * STp, int forward)
655 {
656 struct st_request *SRpnt;
657 unsigned char cmd[MAX_COMMAND_SIZE];
658
659 cmd[0] = SPACE;
660 cmd[1] = 0x01; /* Space FileMarks */
661 if (forward) {
662 cmd[2] = cmd[3] = 0;
663 cmd[4] = 1;
664 } else
665 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
666 cmd[5] = 0;
667
668 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
669 tape_name(STp), forward ? "forward" : "backward"));
670
671 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
672 STp->device->request_queue->rq_timeout,
673 MAX_RETRIES, 1);
674 if (!SRpnt)
675 return (STp->buffer)->syscall_result;
676
677 st_release_request(SRpnt);
678 SRpnt = NULL;
679
680 if ((STp->buffer)->cmdstat.midlevel_result != 0)
681 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
682 tape_name(STp), forward ? "forward" : "backward");
683
684 return (STp->buffer)->syscall_result;
685 }
686
687
688 /* Flush the write buffer (never need to write if variable blocksize). */
689 static int st_flush_write_buffer(struct scsi_tape * STp)
690 {
691 int transfer, blks;
692 int result;
693 unsigned char cmd[MAX_COMMAND_SIZE];
694 struct st_request *SRpnt;
695 struct st_partstat *STps;
696
697 result = write_behind_check(STp);
698 if (result)
699 return result;
700
701 result = 0;
702 if (STp->dirty == 1) {
703
704 transfer = STp->buffer->buffer_bytes;
705 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
706 tape_name(STp), transfer));
707
708 memset(cmd, 0, MAX_COMMAND_SIZE);
709 cmd[0] = WRITE_6;
710 cmd[1] = 1;
711 blks = transfer / STp->block_size;
712 cmd[2] = blks >> 16;
713 cmd[3] = blks >> 8;
714 cmd[4] = blks;
715
716 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
717 STp->device->request_queue->rq_timeout,
718 MAX_WRITE_RETRIES, 1);
719 if (!SRpnt)
720 return (STp->buffer)->syscall_result;
721
722 STps = &(STp->ps[STp->partition]);
723 if ((STp->buffer)->syscall_result != 0) {
724 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
725
726 if (cmdstatp->have_sense && !cmdstatp->deferred &&
727 (cmdstatp->flags & SENSE_EOM) &&
728 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
729 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
730 (!cmdstatp->remainder_valid ||
731 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
732 STp->dirty = 0;
733 (STp->buffer)->buffer_bytes = 0;
734 if (STps->drv_block >= 0)
735 STps->drv_block += blks;
736 result = (-ENOSPC);
737 } else {
738 printk(KERN_ERR "%s: Error on flush.\n",
739 tape_name(STp));
740 STps->drv_block = (-1);
741 result = (-EIO);
742 }
743 } else {
744 if (STps->drv_block >= 0)
745 STps->drv_block += blks;
746 STp->dirty = 0;
747 (STp->buffer)->buffer_bytes = 0;
748 }
749 st_release_request(SRpnt);
750 SRpnt = NULL;
751 }
752 return result;
753 }
754
755
756 /* Flush the tape buffer. The tape will be positioned correctly unless
757 seek_next is true. */
758 static int flush_buffer(struct scsi_tape *STp, int seek_next)
759 {
760 int backspace, result;
761 struct st_buffer *STbuffer;
762 struct st_partstat *STps;
763
764 STbuffer = STp->buffer;
765
766 /*
767 * If there was a bus reset, block further access
768 * to this device.
769 */
770 if (STp->pos_unknown)
771 return (-EIO);
772
773 if (STp->ready != ST_READY)
774 return 0;
775 STps = &(STp->ps[STp->partition]);
776 if (STps->rw == ST_WRITING) /* Writing */
777 return st_flush_write_buffer(STp);
778
779 if (STp->block_size == 0)
780 return 0;
781
782 backspace = ((STp->buffer)->buffer_bytes +
783 (STp->buffer)->read_pointer) / STp->block_size -
784 ((STp->buffer)->read_pointer + STp->block_size - 1) /
785 STp->block_size;
786 (STp->buffer)->buffer_bytes = 0;
787 (STp->buffer)->read_pointer = 0;
788 result = 0;
789 if (!seek_next) {
790 if (STps->eof == ST_FM_HIT) {
791 result = cross_eof(STp, 0); /* Back over the EOF hit */
792 if (!result)
793 STps->eof = ST_NOEOF;
794 else {
795 if (STps->drv_file >= 0)
796 STps->drv_file++;
797 STps->drv_block = 0;
798 }
799 }
800 if (!result && backspace > 0)
801 result = st_int_ioctl(STp, MTBSR, backspace);
802 } else if (STps->eof == ST_FM_HIT) {
803 if (STps->drv_file >= 0)
804 STps->drv_file++;
805 STps->drv_block = 0;
806 STps->eof = ST_NOEOF;
807 }
808 return result;
809
810 }
811 \f
812 /* Set the mode parameters */
813 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
814 {
815 int set_it = 0;
816 unsigned long arg;
817 char *name = tape_name(STp);
818
819 if (!STp->density_changed &&
820 STm->default_density >= 0 &&
821 STm->default_density != STp->density) {
822 arg = STm->default_density;
823 set_it = 1;
824 } else
825 arg = STp->density;
826 arg <<= MT_ST_DENSITY_SHIFT;
827 if (!STp->blksize_changed &&
828 STm->default_blksize >= 0 &&
829 STm->default_blksize != STp->block_size) {
830 arg |= STm->default_blksize;
831 set_it = 1;
832 } else
833 arg |= STp->block_size;
834 if (set_it &&
835 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
836 printk(KERN_WARNING
837 "%s: Can't set default block size to %d bytes and density %x.\n",
838 name, STm->default_blksize, STm->default_density);
839 if (modes_defined)
840 return (-EINVAL);
841 }
842 return 0;
843 }
844
845
846 /* Lock or unlock the drive door. Don't use when st_request allocated. */
847 static int do_door_lock(struct scsi_tape * STp, int do_lock)
848 {
849 int retval, cmd;
850 DEB(char *name = tape_name(STp);)
851
852
853 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
854 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
855 do_lock ? "L" : "Unl"));
856 retval = scsi_ioctl(STp->device, cmd, NULL);
857 if (!retval) {
858 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
859 }
860 else {
861 STp->door_locked = ST_LOCK_FAILS;
862 }
863 return retval;
864 }
865
866
867 /* Set the internal state after reset */
868 static void reset_state(struct scsi_tape *STp)
869 {
870 int i;
871 struct st_partstat *STps;
872
873 STp->pos_unknown = 0;
874 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
875 STps = &(STp->ps[i]);
876 STps->rw = ST_IDLE;
877 STps->eof = ST_NOEOF;
878 STps->at_sm = 0;
879 STps->last_block_valid = 0;
880 STps->drv_block = -1;
881 STps->drv_file = -1;
882 }
883 if (STp->can_partitions) {
884 STp->partition = find_partition(STp);
885 if (STp->partition < 0)
886 STp->partition = 0;
887 STp->new_partition = STp->partition;
888 }
889 }
890 \f
891 /* Test if the drive is ready. Returns either one of the codes below or a negative system
892 error code. */
893 #define CHKRES_READY 0
894 #define CHKRES_NEW_SESSION 1
895 #define CHKRES_NOT_READY 2
896 #define CHKRES_NO_TAPE 3
897
898 #define MAX_ATTENTIONS 10
899
900 static int test_ready(struct scsi_tape *STp, int do_wait)
901 {
902 int attentions, waits, max_wait, scode;
903 int retval = CHKRES_READY, new_session = 0;
904 unsigned char cmd[MAX_COMMAND_SIZE];
905 struct st_request *SRpnt = NULL;
906 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
907
908 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
909
910 for (attentions=waits=0; ; ) {
911 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
912 cmd[0] = TEST_UNIT_READY;
913 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
914 STp->long_timeout, MAX_READY_RETRIES, 1);
915
916 if (!SRpnt) {
917 retval = (STp->buffer)->syscall_result;
918 break;
919 }
920
921 if (cmdstatp->have_sense) {
922
923 scode = cmdstatp->sense_hdr.sense_key;
924
925 if (scode == UNIT_ATTENTION) { /* New media? */
926 new_session = 1;
927 if (attentions < MAX_ATTENTIONS) {
928 attentions++;
929 continue;
930 }
931 else {
932 retval = (-EIO);
933 break;
934 }
935 }
936
937 if (scode == NOT_READY) {
938 if (waits < max_wait) {
939 if (msleep_interruptible(1000)) {
940 retval = (-EINTR);
941 break;
942 }
943 waits++;
944 continue;
945 }
946 else {
947 if ((STp->device)->scsi_level >= SCSI_2 &&
948 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
949 retval = CHKRES_NO_TAPE;
950 else
951 retval = CHKRES_NOT_READY;
952 break;
953 }
954 }
955 }
956
957 retval = (STp->buffer)->syscall_result;
958 if (!retval)
959 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
960 break;
961 }
962
963 if (SRpnt != NULL)
964 st_release_request(SRpnt);
965 return retval;
966 }
967
968
969 /* See if the drive is ready and gather information about the tape. Return values:
970 < 0 negative error code from errno.h
971 0 drive ready
972 1 drive not ready (possibly no tape)
973 */
974 static int check_tape(struct scsi_tape *STp, struct file *filp)
975 {
976 int i, retval, new_session = 0, do_wait;
977 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
978 unsigned short st_flags = filp->f_flags;
979 struct st_request *SRpnt = NULL;
980 struct st_modedef *STm;
981 struct st_partstat *STps;
982 char *name = tape_name(STp);
983 struct inode *inode = filp->f_path.dentry->d_inode;
984 int mode = TAPE_MODE(inode);
985
986 STp->ready = ST_READY;
987
988 if (mode != STp->current_mode) {
989 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
990 name, STp->current_mode, mode));
991 new_session = 1;
992 STp->current_mode = mode;
993 }
994 STm = &(STp->modes[STp->current_mode]);
995
996 saved_cleaning = STp->cleaning_req;
997 STp->cleaning_req = 0;
998
999 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1000 retval = test_ready(STp, do_wait);
1001
1002 if (retval < 0)
1003 goto err_out;
1004
1005 if (retval == CHKRES_NEW_SESSION) {
1006 STp->pos_unknown = 0;
1007 STp->partition = STp->new_partition = 0;
1008 if (STp->can_partitions)
1009 STp->nbr_partitions = 1; /* This guess will be updated later
1010 if necessary */
1011 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1012 STps = &(STp->ps[i]);
1013 STps->rw = ST_IDLE;
1014 STps->eof = ST_NOEOF;
1015 STps->at_sm = 0;
1016 STps->last_block_valid = 0;
1017 STps->drv_block = 0;
1018 STps->drv_file = 0;
1019 }
1020 new_session = 1;
1021 }
1022 else {
1023 STp->cleaning_req |= saved_cleaning;
1024
1025 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1026 if (retval == CHKRES_NO_TAPE)
1027 STp->ready = ST_NO_TAPE;
1028 else
1029 STp->ready = ST_NOT_READY;
1030
1031 STp->density = 0; /* Clear the erroneous "residue" */
1032 STp->write_prot = 0;
1033 STp->block_size = 0;
1034 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1035 STp->partition = STp->new_partition = 0;
1036 STp->door_locked = ST_UNLOCKED;
1037 return CHKRES_NOT_READY;
1038 }
1039 }
1040
1041 if (STp->omit_blklims)
1042 STp->min_block = STp->max_block = (-1);
1043 else {
1044 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1045 cmd[0] = READ_BLOCK_LIMITS;
1046
1047 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1048 STp->device->request_queue->rq_timeout,
1049 MAX_READY_RETRIES, 1);
1050 if (!SRpnt) {
1051 retval = (STp->buffer)->syscall_result;
1052 goto err_out;
1053 }
1054
1055 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1056 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1057 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1058 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1059 (STp->buffer)->b_data[5];
1060 if ( DEB( debugging || ) !STp->inited)
1061 printk(KERN_INFO
1062 "%s: Block limits %d - %d bytes.\n", name,
1063 STp->min_block, STp->max_block);
1064 } else {
1065 STp->min_block = STp->max_block = (-1);
1066 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1067 name));
1068 }
1069 }
1070
1071 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1072 cmd[0] = MODE_SENSE;
1073 cmd[4] = 12;
1074
1075 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1076 STp->device->request_queue->rq_timeout,
1077 MAX_READY_RETRIES, 1);
1078 if (!SRpnt) {
1079 retval = (STp->buffer)->syscall_result;
1080 goto err_out;
1081 }
1082
1083 if ((STp->buffer)->syscall_result != 0) {
1084 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1085 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1086 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1087 STp->drv_write_prot = 0;
1088 } else {
1089 DEBC(printk(ST_DEB_MSG
1090 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1091 name,
1092 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1093 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1094
1095 if ((STp->buffer)->b_data[3] >= 8) {
1096 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1097 STp->density = (STp->buffer)->b_data[4];
1098 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1099 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1100 DEBC(printk(ST_DEB_MSG
1101 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1102 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1103 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1104 STp->drv_buffer));
1105 }
1106 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1107 }
1108 st_release_request(SRpnt);
1109 SRpnt = NULL;
1110 STp->inited = 1;
1111
1112 if (STp->block_size > 0)
1113 (STp->buffer)->buffer_blocks =
1114 (STp->buffer)->buffer_size / STp->block_size;
1115 else
1116 (STp->buffer)->buffer_blocks = 1;
1117 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1118
1119 DEBC(printk(ST_DEB_MSG
1120 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1121 STp->block_size, (STp->buffer)->buffer_size,
1122 (STp->buffer)->buffer_blocks));
1123
1124 if (STp->drv_write_prot) {
1125 STp->write_prot = 1;
1126
1127 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1128
1129 if (do_wait &&
1130 ((st_flags & O_ACCMODE) == O_WRONLY ||
1131 (st_flags & O_ACCMODE) == O_RDWR)) {
1132 retval = (-EROFS);
1133 goto err_out;
1134 }
1135 }
1136
1137 if (STp->can_partitions && STp->nbr_partitions < 1) {
1138 /* This code is reached when the device is opened for the first time
1139 after the driver has been initialized with tape in the drive and the
1140 partition support has been enabled. */
1141 DEBC(printk(ST_DEB_MSG
1142 "%s: Updating partition number in status.\n", name));
1143 if ((STp->partition = find_partition(STp)) < 0) {
1144 retval = STp->partition;
1145 goto err_out;
1146 }
1147 STp->new_partition = STp->partition;
1148 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1149 }
1150
1151 if (new_session) { /* Change the drive parameters for the new mode */
1152 STp->density_changed = STp->blksize_changed = 0;
1153 STp->compression_changed = 0;
1154 if (!(STm->defaults_for_writes) &&
1155 (retval = set_mode_densblk(STp, STm)) < 0)
1156 goto err_out;
1157
1158 if (STp->default_drvbuffer != 0xff) {
1159 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1160 printk(KERN_WARNING
1161 "%s: Can't set default drive buffering to %d.\n",
1162 name, STp->default_drvbuffer);
1163 }
1164 }
1165
1166 return CHKRES_READY;
1167
1168 err_out:
1169 return retval;
1170 }
1171
1172
1173 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1174 module count. */
1175 static int st_open(struct inode *inode, struct file *filp)
1176 {
1177 int i, retval = (-EIO);
1178 struct scsi_tape *STp;
1179 struct st_partstat *STps;
1180 int dev = TAPE_NR(inode);
1181 char *name;
1182
1183 lock_kernel();
1184 /*
1185 * We really want to do nonseekable_open(inode, filp); here, but some
1186 * versions of tar incorrectly call lseek on tapes and bail out if that
1187 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1188 */
1189 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1190
1191 if (!(STp = scsi_tape_get(dev))) {
1192 unlock_kernel();
1193 return -ENXIO;
1194 }
1195
1196 write_lock(&st_dev_arr_lock);
1197 filp->private_data = STp;
1198 name = tape_name(STp);
1199
1200 if (STp->in_use) {
1201 write_unlock(&st_dev_arr_lock);
1202 scsi_tape_put(STp);
1203 unlock_kernel();
1204 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1205 return (-EBUSY);
1206 }
1207
1208 STp->in_use = 1;
1209 write_unlock(&st_dev_arr_lock);
1210 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1211
1212 if (!scsi_block_when_processing_errors(STp->device)) {
1213 retval = (-ENXIO);
1214 goto err_out;
1215 }
1216
1217 /* See that we have at least a one page buffer available */
1218 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1219 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1220 name);
1221 retval = (-EOVERFLOW);
1222 goto err_out;
1223 }
1224
1225 (STp->buffer)->cleared = 0;
1226 (STp->buffer)->writing = 0;
1227 (STp->buffer)->syscall_result = 0;
1228
1229 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1230
1231 STp->dirty = 0;
1232 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1233 STps = &(STp->ps[i]);
1234 STps->rw = ST_IDLE;
1235 }
1236 STp->try_dio_now = STp->try_dio;
1237 STp->recover_count = 0;
1238 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1239 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1240
1241 retval = check_tape(STp, filp);
1242 if (retval < 0)
1243 goto err_out;
1244 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1245 retval != CHKRES_READY) {
1246 if (STp->ready == NO_TAPE)
1247 retval = (-ENOMEDIUM);
1248 else
1249 retval = (-EIO);
1250 goto err_out;
1251 }
1252 unlock_kernel();
1253 return 0;
1254
1255 err_out:
1256 normalize_buffer(STp->buffer);
1257 STp->in_use = 0;
1258 scsi_tape_put(STp);
1259 unlock_kernel();
1260 return retval;
1261
1262 }
1263 \f
1264
1265 /* Flush the tape buffer before close */
1266 static int st_flush(struct file *filp, fl_owner_t id)
1267 {
1268 int result = 0, result2;
1269 unsigned char cmd[MAX_COMMAND_SIZE];
1270 struct st_request *SRpnt;
1271 struct scsi_tape *STp = filp->private_data;
1272 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1273 struct st_partstat *STps = &(STp->ps[STp->partition]);
1274 char *name = tape_name(STp);
1275
1276 if (file_count(filp) > 1)
1277 return 0;
1278
1279 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1280 result = st_flush_write_buffer(STp);
1281 if (result != 0 && result != (-ENOSPC))
1282 goto out;
1283 }
1284
1285 if (STp->can_partitions &&
1286 (result2 = switch_partition(STp)) < 0) {
1287 DEBC(printk(ST_DEB_MSG
1288 "%s: switch_partition at close failed.\n", name));
1289 if (result == 0)
1290 result = result2;
1291 goto out;
1292 }
1293
1294 DEBC( if (STp->nbr_requests)
1295 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1296 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1297
1298 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1299 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1300
1301 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1302 name, STp->nbr_waits, STp->nbr_finished);
1303 )
1304
1305 memset(cmd, 0, MAX_COMMAND_SIZE);
1306 cmd[0] = WRITE_FILEMARKS;
1307 cmd[4] = 1 + STp->two_fm;
1308
1309 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1310 STp->device->request_queue->rq_timeout,
1311 MAX_WRITE_RETRIES, 1);
1312 if (!SRpnt) {
1313 result = (STp->buffer)->syscall_result;
1314 goto out;
1315 }
1316
1317 if (STp->buffer->syscall_result == 0 ||
1318 (cmdstatp->have_sense && !cmdstatp->deferred &&
1319 (cmdstatp->flags & SENSE_EOM) &&
1320 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1321 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1322 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1323 /* Write successful at EOM */
1324 st_release_request(SRpnt);
1325 SRpnt = NULL;
1326 if (STps->drv_file >= 0)
1327 STps->drv_file++;
1328 STps->drv_block = 0;
1329 if (STp->two_fm)
1330 cross_eof(STp, 0);
1331 STps->eof = ST_FM;
1332 }
1333 else { /* Write error */
1334 st_release_request(SRpnt);
1335 SRpnt = NULL;
1336 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1337 if (result == 0)
1338 result = (-EIO);
1339 }
1340
1341 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1342 name, cmd[4]));
1343 } else if (!STp->rew_at_close) {
1344 STps = &(STp->ps[STp->partition]);
1345 if (!STm->sysv || STps->rw != ST_READING) {
1346 if (STp->can_bsr)
1347 result = flush_buffer(STp, 0);
1348 else if (STps->eof == ST_FM_HIT) {
1349 result = cross_eof(STp, 0);
1350 if (result) {
1351 if (STps->drv_file >= 0)
1352 STps->drv_file++;
1353 STps->drv_block = 0;
1354 STps->eof = ST_FM;
1355 } else
1356 STps->eof = ST_NOEOF;
1357 }
1358 } else if ((STps->eof == ST_NOEOF &&
1359 !(result = cross_eof(STp, 1))) ||
1360 STps->eof == ST_FM_HIT) {
1361 if (STps->drv_file >= 0)
1362 STps->drv_file++;
1363 STps->drv_block = 0;
1364 STps->eof = ST_FM;
1365 }
1366 }
1367
1368 out:
1369 if (STp->rew_at_close) {
1370 result2 = st_int_ioctl(STp, MTREW, 1);
1371 if (result == 0)
1372 result = result2;
1373 }
1374 return result;
1375 }
1376
1377
1378 /* Close the device and release it. BKL is not needed: this is the only thread
1379 accessing this tape. */
1380 static int st_release(struct inode *inode, struct file *filp)
1381 {
1382 int result = 0;
1383 struct scsi_tape *STp = filp->private_data;
1384
1385 if (STp->door_locked == ST_LOCKED_AUTO)
1386 do_door_lock(STp, 0);
1387
1388 normalize_buffer(STp->buffer);
1389 write_lock(&st_dev_arr_lock);
1390 STp->in_use = 0;
1391 write_unlock(&st_dev_arr_lock);
1392 scsi_tape_put(STp);
1393
1394 return result;
1395 }
1396 \f
1397 /* The checks common to both reading and writing */
1398 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1399 {
1400 ssize_t retval = 0;
1401
1402 /*
1403 * If we are in the middle of error recovery, don't let anyone
1404 * else try and use this device. Also, if error recovery fails, it
1405 * may try and take the device offline, in which case all further
1406 * access to the device is prohibited.
1407 */
1408 if (!scsi_block_when_processing_errors(STp->device)) {
1409 retval = (-ENXIO);
1410 goto out;
1411 }
1412
1413 if (STp->ready != ST_READY) {
1414 if (STp->ready == ST_NO_TAPE)
1415 retval = (-ENOMEDIUM);
1416 else
1417 retval = (-EIO);
1418 goto out;
1419 }
1420
1421 if (! STp->modes[STp->current_mode].defined) {
1422 retval = (-ENXIO);
1423 goto out;
1424 }
1425
1426
1427 /*
1428 * If there was a bus reset, block further access
1429 * to this device.
1430 */
1431 if (STp->pos_unknown) {
1432 retval = (-EIO);
1433 goto out;
1434 }
1435
1436 if (count == 0)
1437 goto out;
1438
1439 DEB(
1440 if (!STp->in_use) {
1441 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1442 retval = (-EIO);
1443 goto out;
1444 } ) /* end DEB */
1445
1446 if (STp->can_partitions &&
1447 (retval = switch_partition(STp)) < 0)
1448 goto out;
1449
1450 if (STp->block_size == 0 && STp->max_block > 0 &&
1451 (count < STp->min_block || count > STp->max_block)) {
1452 retval = (-EINVAL);
1453 goto out;
1454 }
1455
1456 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1457 !do_door_lock(STp, 1))
1458 STp->door_locked = ST_LOCKED_AUTO;
1459
1460 out:
1461 return retval;
1462 }
1463
1464
1465 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1466 size_t count, int is_read)
1467 {
1468 int i, bufsize, retval = 0;
1469 struct st_buffer *STbp = STp->buffer;
1470
1471 if (is_read)
1472 i = STp->try_dio_now && try_rdio;
1473 else
1474 i = STp->try_dio_now && try_wdio;
1475
1476 if (i && ((unsigned long)buf & queue_dma_alignment(
1477 STp->device->request_queue)) == 0) {
1478 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1479 count, (is_read ? READ : WRITE));
1480 if (i > 0) {
1481 STbp->do_dio = i;
1482 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1483 }
1484 else
1485 STbp->do_dio = 0; /* fall back to buffering with any error */
1486 STbp->sg_segs = STbp->do_dio;
1487 DEB(
1488 if (STbp->do_dio) {
1489 STp->nbr_dio++;
1490 STp->nbr_pages += STbp->do_dio;
1491 }
1492 )
1493 } else
1494 STbp->do_dio = 0;
1495 DEB( STp->nbr_requests++; )
1496
1497 if (!STbp->do_dio) {
1498 if (STp->block_size)
1499 bufsize = STp->block_size > st_fixed_buffer_size ?
1500 STp->block_size : st_fixed_buffer_size;
1501 else {
1502 bufsize = count;
1503 /* Make sure that data from previous user is not leaked even if
1504 HBA does not return correct residual */
1505 if (is_read && STp->sili && !STbp->cleared)
1506 clear_buffer(STbp);
1507 }
1508
1509 if (bufsize > STbp->buffer_size &&
1510 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1511 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1512 tape_name(STp), bufsize);
1513 retval = (-EOVERFLOW);
1514 goto out;
1515 }
1516 if (STp->block_size)
1517 STbp->buffer_blocks = bufsize / STp->block_size;
1518 }
1519
1520 out:
1521 return retval;
1522 }
1523
1524
1525 /* Can be called more than once after each setup_buffer() */
1526 static void release_buffering(struct scsi_tape *STp, int is_read)
1527 {
1528 struct st_buffer *STbp;
1529
1530 STbp = STp->buffer;
1531 if (STbp->do_dio) {
1532 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1533 STbp->do_dio = 0;
1534 STbp->sg_segs = 0;
1535 }
1536 }
1537
1538
1539 /* Write command */
1540 static ssize_t
1541 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1542 {
1543 ssize_t total;
1544 ssize_t i, do_count, blks, transfer;
1545 ssize_t retval;
1546 int undone, retry_eot = 0, scode;
1547 int async_write;
1548 unsigned char cmd[MAX_COMMAND_SIZE];
1549 const char __user *b_point;
1550 struct st_request *SRpnt = NULL;
1551 struct scsi_tape *STp = filp->private_data;
1552 struct st_modedef *STm;
1553 struct st_partstat *STps;
1554 struct st_buffer *STbp;
1555 char *name = tape_name(STp);
1556
1557 if (mutex_lock_interruptible(&STp->lock))
1558 return -ERESTARTSYS;
1559
1560 retval = rw_checks(STp, filp, count);
1561 if (retval || count == 0)
1562 goto out;
1563
1564 /* Write must be integral number of blocks */
1565 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1566 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1567 name);
1568 retval = (-EINVAL);
1569 goto out;
1570 }
1571
1572 STm = &(STp->modes[STp->current_mode]);
1573 STps = &(STp->ps[STp->partition]);
1574
1575 if (STp->write_prot) {
1576 retval = (-EACCES);
1577 goto out;
1578 }
1579
1580
1581 if (STps->rw == ST_READING) {
1582 retval = flush_buffer(STp, 0);
1583 if (retval)
1584 goto out;
1585 STps->rw = ST_WRITING;
1586 } else if (STps->rw != ST_WRITING &&
1587 STps->drv_file == 0 && STps->drv_block == 0) {
1588 if ((retval = set_mode_densblk(STp, STm)) < 0)
1589 goto out;
1590 if (STm->default_compression != ST_DONT_TOUCH &&
1591 !(STp->compression_changed)) {
1592 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1593 printk(KERN_WARNING "%s: Can't set default compression.\n",
1594 name);
1595 if (modes_defined) {
1596 retval = (-EINVAL);
1597 goto out;
1598 }
1599 }
1600 }
1601 }
1602
1603 STbp = STp->buffer;
1604 i = write_behind_check(STp);
1605 if (i) {
1606 if (i == -ENOSPC)
1607 STps->eof = ST_EOM_OK;
1608 else
1609 STps->eof = ST_EOM_ERROR;
1610 }
1611
1612 if (STps->eof == ST_EOM_OK) {
1613 STps->eof = ST_EOD_1; /* allow next write */
1614 retval = (-ENOSPC);
1615 goto out;
1616 }
1617 else if (STps->eof == ST_EOM_ERROR) {
1618 retval = (-EIO);
1619 goto out;
1620 }
1621
1622 /* Check the buffer readability in cases where copy_user might catch
1623 the problems after some tape movement. */
1624 if (STp->block_size != 0 &&
1625 !STbp->do_dio &&
1626 (copy_from_user(&i, buf, 1) != 0 ||
1627 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1628 retval = (-EFAULT);
1629 goto out;
1630 }
1631
1632 retval = setup_buffering(STp, buf, count, 0);
1633 if (retval)
1634 goto out;
1635
1636 total = count;
1637
1638 memset(cmd, 0, MAX_COMMAND_SIZE);
1639 cmd[0] = WRITE_6;
1640 cmd[1] = (STp->block_size != 0);
1641
1642 STps->rw = ST_WRITING;
1643
1644 b_point = buf;
1645 while (count > 0 && !retry_eot) {
1646
1647 if (STbp->do_dio) {
1648 do_count = count;
1649 }
1650 else {
1651 if (STp->block_size == 0)
1652 do_count = count;
1653 else {
1654 do_count = STbp->buffer_blocks * STp->block_size -
1655 STbp->buffer_bytes;
1656 if (do_count > count)
1657 do_count = count;
1658 }
1659
1660 i = append_to_buffer(b_point, STbp, do_count);
1661 if (i) {
1662 retval = i;
1663 goto out;
1664 }
1665 }
1666 count -= do_count;
1667 b_point += do_count;
1668
1669 async_write = STp->block_size == 0 && !STbp->do_dio &&
1670 STm->do_async_writes && STps->eof < ST_EOM_OK;
1671
1672 if (STp->block_size != 0 && STm->do_buffer_writes &&
1673 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1674 STbp->buffer_bytes < STbp->buffer_size) {
1675 STp->dirty = 1;
1676 /* Don't write a buffer that is not full enough. */
1677 if (!async_write && count == 0)
1678 break;
1679 }
1680
1681 retry_write:
1682 if (STp->block_size == 0)
1683 blks = transfer = do_count;
1684 else {
1685 if (!STbp->do_dio)
1686 blks = STbp->buffer_bytes;
1687 else
1688 blks = do_count;
1689 blks /= STp->block_size;
1690 transfer = blks * STp->block_size;
1691 }
1692 cmd[2] = blks >> 16;
1693 cmd[3] = blks >> 8;
1694 cmd[4] = blks;
1695
1696 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1697 STp->device->request_queue->rq_timeout,
1698 MAX_WRITE_RETRIES, !async_write);
1699 if (!SRpnt) {
1700 retval = STbp->syscall_result;
1701 goto out;
1702 }
1703 if (async_write && !STbp->syscall_result) {
1704 STbp->writing = transfer;
1705 STp->dirty = !(STbp->writing ==
1706 STbp->buffer_bytes);
1707 SRpnt = NULL; /* Prevent releasing this request! */
1708 DEB( STp->write_pending = 1; )
1709 break;
1710 }
1711
1712 if (STbp->syscall_result != 0) {
1713 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1714
1715 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1716 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1717 scode = cmdstatp->sense_hdr.sense_key;
1718 if (cmdstatp->remainder_valid)
1719 undone = (int)cmdstatp->uremainder64;
1720 else if (STp->block_size == 0 &&
1721 scode == VOLUME_OVERFLOW)
1722 undone = transfer;
1723 else
1724 undone = 0;
1725 if (STp->block_size != 0)
1726 undone *= STp->block_size;
1727 if (undone <= do_count) {
1728 /* Only data from this write is not written */
1729 count += undone;
1730 b_point -= undone;
1731 do_count -= undone;
1732 if (STp->block_size)
1733 blks = (transfer - undone) / STp->block_size;
1734 STps->eof = ST_EOM_OK;
1735 /* Continue in fixed block mode if all written
1736 in this request but still something left to write
1737 (retval left to zero)
1738 */
1739 if (STp->block_size == 0 ||
1740 undone > 0 || count == 0)
1741 retval = (-ENOSPC); /* EOM within current request */
1742 DEBC(printk(ST_DEB_MSG
1743 "%s: EOM with %d bytes unwritten.\n",
1744 name, (int)count));
1745 } else {
1746 /* EOT within data buffered earlier (possible only
1747 in fixed block mode without direct i/o) */
1748 if (!retry_eot && !cmdstatp->deferred &&
1749 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1750 move_buffer_data(STp->buffer, transfer - undone);
1751 retry_eot = 1;
1752 if (STps->drv_block >= 0) {
1753 STps->drv_block += (transfer - undone) /
1754 STp->block_size;
1755 }
1756 STps->eof = ST_EOM_OK;
1757 DEBC(printk(ST_DEB_MSG
1758 "%s: Retry write of %d bytes at EOM.\n",
1759 name, STp->buffer->buffer_bytes));
1760 goto retry_write;
1761 }
1762 else {
1763 /* Either error within data buffered by driver or
1764 failed retry */
1765 count -= do_count;
1766 blks = do_count = 0;
1767 STps->eof = ST_EOM_ERROR;
1768 STps->drv_block = (-1); /* Too cautious? */
1769 retval = (-EIO); /* EOM for old data */
1770 DEBC(printk(ST_DEB_MSG
1771 "%s: EOM with lost data.\n",
1772 name));
1773 }
1774 }
1775 } else {
1776 count += do_count;
1777 STps->drv_block = (-1); /* Too cautious? */
1778 retval = STbp->syscall_result;
1779 }
1780
1781 }
1782
1783 if (STps->drv_block >= 0) {
1784 if (STp->block_size == 0)
1785 STps->drv_block += (do_count > 0);
1786 else
1787 STps->drv_block += blks;
1788 }
1789
1790 STbp->buffer_bytes = 0;
1791 STp->dirty = 0;
1792
1793 if (retval || retry_eot) {
1794 if (count < total)
1795 retval = total - count;
1796 goto out;
1797 }
1798 }
1799
1800 if (STps->eof == ST_EOD_1)
1801 STps->eof = ST_EOM_OK;
1802 else if (STps->eof != ST_EOM_OK)
1803 STps->eof = ST_NOEOF;
1804 retval = total - count;
1805
1806 out:
1807 if (SRpnt != NULL)
1808 st_release_request(SRpnt);
1809 release_buffering(STp, 0);
1810 mutex_unlock(&STp->lock);
1811
1812 return retval;
1813 }
1814 \f
1815 /* Read data from the tape. Returns zero in the normal case, one if the
1816 eof status has changed, and the negative error code in case of a
1817 fatal error. Otherwise updates the buffer and the eof state.
1818
1819 Does release user buffer mapping if it is set.
1820 */
1821 static long read_tape(struct scsi_tape *STp, long count,
1822 struct st_request ** aSRpnt)
1823 {
1824 int transfer, blks, bytes;
1825 unsigned char cmd[MAX_COMMAND_SIZE];
1826 struct st_request *SRpnt;
1827 struct st_modedef *STm;
1828 struct st_partstat *STps;
1829 struct st_buffer *STbp;
1830 int retval = 0;
1831 char *name = tape_name(STp);
1832
1833 if (count == 0)
1834 return 0;
1835
1836 STm = &(STp->modes[STp->current_mode]);
1837 STps = &(STp->ps[STp->partition]);
1838 if (STps->eof == ST_FM_HIT)
1839 return 1;
1840 STbp = STp->buffer;
1841
1842 if (STp->block_size == 0)
1843 blks = bytes = count;
1844 else {
1845 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1846 blks = (STp->buffer)->buffer_blocks;
1847 bytes = blks * STp->block_size;
1848 } else {
1849 bytes = count;
1850 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1851 bytes = (STp->buffer)->buffer_size;
1852 blks = bytes / STp->block_size;
1853 bytes = blks * STp->block_size;
1854 }
1855 }
1856
1857 memset(cmd, 0, MAX_COMMAND_SIZE);
1858 cmd[0] = READ_6;
1859 cmd[1] = (STp->block_size != 0);
1860 if (!cmd[1] && STp->sili)
1861 cmd[1] |= 2;
1862 cmd[2] = blks >> 16;
1863 cmd[3] = blks >> 8;
1864 cmd[4] = blks;
1865
1866 SRpnt = *aSRpnt;
1867 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1868 STp->device->request_queue->rq_timeout,
1869 MAX_RETRIES, 1);
1870 release_buffering(STp, 1);
1871 *aSRpnt = SRpnt;
1872 if (!SRpnt)
1873 return STbp->syscall_result;
1874
1875 STbp->read_pointer = 0;
1876 STps->at_sm = 0;
1877
1878 /* Something to check */
1879 if (STbp->syscall_result) {
1880 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1881
1882 retval = 1;
1883 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1884 name,
1885 SRpnt->sense[0], SRpnt->sense[1],
1886 SRpnt->sense[2], SRpnt->sense[3],
1887 SRpnt->sense[4], SRpnt->sense[5],
1888 SRpnt->sense[6], SRpnt->sense[7]));
1889 if (cmdstatp->have_sense) {
1890
1891 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1892 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1893
1894 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1895 /* Compute the residual count */
1896 if (cmdstatp->remainder_valid)
1897 transfer = (int)cmdstatp->uremainder64;
1898 else
1899 transfer = 0;
1900 if (STp->block_size == 0 &&
1901 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1902 transfer = bytes;
1903
1904 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1905 if (STp->block_size == 0) {
1906 if (transfer <= 0) {
1907 if (transfer < 0)
1908 printk(KERN_NOTICE
1909 "%s: Failed to read %d byte block with %d byte transfer.\n",
1910 name, bytes - transfer, bytes);
1911 if (STps->drv_block >= 0)
1912 STps->drv_block += 1;
1913 STbp->buffer_bytes = 0;
1914 return (-ENOMEM);
1915 }
1916 STbp->buffer_bytes = bytes - transfer;
1917 } else {
1918 st_release_request(SRpnt);
1919 SRpnt = *aSRpnt = NULL;
1920 if (transfer == blks) { /* We did not get anything, error */
1921 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1922 if (STps->drv_block >= 0)
1923 STps->drv_block += blks - transfer + 1;
1924 st_int_ioctl(STp, MTBSR, 1);
1925 return (-EIO);
1926 }
1927 /* We have some data, deliver it */
1928 STbp->buffer_bytes = (blks - transfer) *
1929 STp->block_size;
1930 DEBC(printk(ST_DEB_MSG
1931 "%s: ILI but enough data received %ld %d.\n",
1932 name, count, STbp->buffer_bytes));
1933 if (STps->drv_block >= 0)
1934 STps->drv_block += 1;
1935 if (st_int_ioctl(STp, MTBSR, 1))
1936 return (-EIO);
1937 }
1938 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1939 if (STps->eof != ST_FM_HIT)
1940 STps->eof = ST_FM_HIT;
1941 else
1942 STps->eof = ST_EOD_2;
1943 if (STp->block_size == 0)
1944 STbp->buffer_bytes = 0;
1945 else
1946 STbp->buffer_bytes =
1947 bytes - transfer * STp->block_size;
1948 DEBC(printk(ST_DEB_MSG
1949 "%s: EOF detected (%d bytes read).\n",
1950 name, STbp->buffer_bytes));
1951 } else if (cmdstatp->flags & SENSE_EOM) {
1952 if (STps->eof == ST_FM)
1953 STps->eof = ST_EOD_1;
1954 else
1955 STps->eof = ST_EOM_OK;
1956 if (STp->block_size == 0)
1957 STbp->buffer_bytes = bytes - transfer;
1958 else
1959 STbp->buffer_bytes =
1960 bytes - transfer * STp->block_size;
1961
1962 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1963 name, STbp->buffer_bytes));
1964 }
1965 }
1966 /* end of EOF, EOM, ILI test */
1967 else { /* nonzero sense key */
1968 DEBC(printk(ST_DEB_MSG
1969 "%s: Tape error while reading.\n", name));
1970 STps->drv_block = (-1);
1971 if (STps->eof == ST_FM &&
1972 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1973 DEBC(printk(ST_DEB_MSG
1974 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1975 name));
1976 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1977 } else /* Some other extended sense code */
1978 retval = (-EIO);
1979 }
1980
1981 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1982 STbp->buffer_bytes = 0;
1983 }
1984 /* End of extended sense test */
1985 else { /* Non-extended sense */
1986 retval = STbp->syscall_result;
1987 }
1988
1989 }
1990 /* End of error handling */
1991 else { /* Read successful */
1992 STbp->buffer_bytes = bytes;
1993 if (STp->sili) /* In fixed block mode residual is always zero here */
1994 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
1995 }
1996
1997 if (STps->drv_block >= 0) {
1998 if (STp->block_size == 0)
1999 STps->drv_block++;
2000 else
2001 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2002 }
2003 return retval;
2004 }
2005 \f
2006
2007 /* Read command */
2008 static ssize_t
2009 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2010 {
2011 ssize_t total;
2012 ssize_t retval = 0;
2013 ssize_t i, transfer;
2014 int special, do_dio = 0;
2015 struct st_request *SRpnt = NULL;
2016 struct scsi_tape *STp = filp->private_data;
2017 struct st_modedef *STm;
2018 struct st_partstat *STps;
2019 struct st_buffer *STbp = STp->buffer;
2020 DEB( char *name = tape_name(STp); )
2021
2022 if (mutex_lock_interruptible(&STp->lock))
2023 return -ERESTARTSYS;
2024
2025 retval = rw_checks(STp, filp, count);
2026 if (retval || count == 0)
2027 goto out;
2028
2029 STm = &(STp->modes[STp->current_mode]);
2030 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2031 if (!STm->do_read_ahead) {
2032 retval = (-EINVAL); /* Read must be integral number of blocks */
2033 goto out;
2034 }
2035 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2036 }
2037
2038 STps = &(STp->ps[STp->partition]);
2039 if (STps->rw == ST_WRITING) {
2040 retval = flush_buffer(STp, 0);
2041 if (retval)
2042 goto out;
2043 STps->rw = ST_READING;
2044 }
2045 DEB(
2046 if (debugging && STps->eof != ST_NOEOF)
2047 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2048 STps->eof, STbp->buffer_bytes);
2049 ) /* end DEB */
2050
2051 retval = setup_buffering(STp, buf, count, 1);
2052 if (retval)
2053 goto out;
2054 do_dio = STbp->do_dio;
2055
2056 if (STbp->buffer_bytes == 0 &&
2057 STps->eof >= ST_EOD_1) {
2058 if (STps->eof < ST_EOD) {
2059 STps->eof += 1;
2060 retval = 0;
2061 goto out;
2062 }
2063 retval = (-EIO); /* EOM or Blank Check */
2064 goto out;
2065 }
2066
2067 if (do_dio) {
2068 /* Check the buffer writability before any tape movement. Don't alter
2069 buffer data. */
2070 if (copy_from_user(&i, buf, 1) != 0 ||
2071 copy_to_user(buf, &i, 1) != 0 ||
2072 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2073 copy_to_user(buf + count - 1, &i, 1) != 0) {
2074 retval = (-EFAULT);
2075 goto out;
2076 }
2077 }
2078
2079 STps->rw = ST_READING;
2080
2081
2082 /* Loop until enough data in buffer or a special condition found */
2083 for (total = 0, special = 0; total < count && !special;) {
2084
2085 /* Get new data if the buffer is empty */
2086 if (STbp->buffer_bytes == 0) {
2087 special = read_tape(STp, count - total, &SRpnt);
2088 if (special < 0) { /* No need to continue read */
2089 retval = special;
2090 goto out;
2091 }
2092 }
2093
2094 /* Move the data from driver buffer to user buffer */
2095 if (STbp->buffer_bytes > 0) {
2096 DEB(
2097 if (debugging && STps->eof != ST_NOEOF)
2098 printk(ST_DEB_MSG
2099 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2100 STps->eof, STbp->buffer_bytes,
2101 (int)(count - total));
2102 ) /* end DEB */
2103 transfer = STbp->buffer_bytes < count - total ?
2104 STbp->buffer_bytes : count - total;
2105 if (!do_dio) {
2106 i = from_buffer(STbp, buf, transfer);
2107 if (i) {
2108 retval = i;
2109 goto out;
2110 }
2111 }
2112 buf += transfer;
2113 total += transfer;
2114 }
2115
2116 if (STp->block_size == 0)
2117 break; /* Read only one variable length block */
2118
2119 } /* for (total = 0, special = 0;
2120 total < count && !special; ) */
2121
2122 /* Change the eof state if no data from tape or buffer */
2123 if (total == 0) {
2124 if (STps->eof == ST_FM_HIT) {
2125 STps->eof = ST_FM;
2126 STps->drv_block = 0;
2127 if (STps->drv_file >= 0)
2128 STps->drv_file++;
2129 } else if (STps->eof == ST_EOD_1) {
2130 STps->eof = ST_EOD_2;
2131 STps->drv_block = 0;
2132 if (STps->drv_file >= 0)
2133 STps->drv_file++;
2134 } else if (STps->eof == ST_EOD_2)
2135 STps->eof = ST_EOD;
2136 } else if (STps->eof == ST_FM)
2137 STps->eof = ST_NOEOF;
2138 retval = total;
2139
2140 out:
2141 if (SRpnt != NULL) {
2142 st_release_request(SRpnt);
2143 SRpnt = NULL;
2144 }
2145 if (do_dio) {
2146 release_buffering(STp, 1);
2147 STbp->buffer_bytes = 0;
2148 }
2149 mutex_unlock(&STp->lock);
2150
2151 return retval;
2152 }
2153 \f
2154
2155
2156 DEB(
2157 /* Set the driver options */
2158 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2159 {
2160 if (debugging) {
2161 printk(KERN_INFO
2162 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2163 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2164 STm->do_read_ahead);
2165 printk(KERN_INFO
2166 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2167 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2168 printk(KERN_INFO
2169 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2170 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2171 STp->scsi2_logical);
2172 printk(KERN_INFO
2173 "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate,
2174 STp->sili);
2175 printk(KERN_INFO "%s: debugging: %d\n",
2176 name, debugging);
2177 }
2178 }
2179 )
2180
2181
2182 static int st_set_options(struct scsi_tape *STp, long options)
2183 {
2184 int value;
2185 long code;
2186 struct st_modedef *STm;
2187 char *name = tape_name(STp);
2188 struct cdev *cd0, *cd1;
2189
2190 STm = &(STp->modes[STp->current_mode]);
2191 if (!STm->defined) {
2192 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2193 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2194 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
2195 modes_defined = 1;
2196 DEBC(printk(ST_DEB_MSG
2197 "%s: Initialized mode %d definition from mode 0\n",
2198 name, STp->current_mode));
2199 }
2200
2201 code = options & MT_ST_OPTIONS;
2202 if (code == MT_ST_BOOLEANS) {
2203 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2204 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2205 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2206 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2207 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2208 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2209 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2210 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2211 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2212 if ((STp->device)->scsi_level >= SCSI_2)
2213 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2214 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2215 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2216 STm->sysv = (options & MT_ST_SYSV) != 0;
2217 STp->sili = (options & MT_ST_SILI) != 0;
2218 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2219 st_log_options(STp, STm, name); )
2220 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2221 value = (code == MT_ST_SETBOOLEANS);
2222 if ((options & MT_ST_BUFFER_WRITES) != 0)
2223 STm->do_buffer_writes = value;
2224 if ((options & MT_ST_ASYNC_WRITES) != 0)
2225 STm->do_async_writes = value;
2226 if ((options & MT_ST_DEF_WRITES) != 0)
2227 STm->defaults_for_writes = value;
2228 if ((options & MT_ST_READ_AHEAD) != 0)
2229 STm->do_read_ahead = value;
2230 if ((options & MT_ST_TWO_FM) != 0)
2231 STp->two_fm = value;
2232 if ((options & MT_ST_FAST_MTEOM) != 0)
2233 STp->fast_mteom = value;
2234 if ((options & MT_ST_AUTO_LOCK) != 0)
2235 STp->do_auto_lock = value;
2236 if ((options & MT_ST_CAN_BSR) != 0)
2237 STp->can_bsr = value;
2238 if ((options & MT_ST_NO_BLKLIMS) != 0)
2239 STp->omit_blklims = value;
2240 if ((STp->device)->scsi_level >= SCSI_2 &&
2241 (options & MT_ST_CAN_PARTITIONS) != 0)
2242 STp->can_partitions = value;
2243 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2244 STp->scsi2_logical = value;
2245 if ((options & MT_ST_NOWAIT) != 0)
2246 STp->immediate = value;
2247 if ((options & MT_ST_SYSV) != 0)
2248 STm->sysv = value;
2249 if ((options & MT_ST_SILI) != 0)
2250 STp->sili = value;
2251 DEB(
2252 if ((options & MT_ST_DEBUGGING) != 0)
2253 debugging = value;
2254 st_log_options(STp, STm, name); )
2255 } else if (code == MT_ST_WRITE_THRESHOLD) {
2256 /* Retained for compatibility */
2257 } else if (code == MT_ST_DEF_BLKSIZE) {
2258 value = (options & ~MT_ST_OPTIONS);
2259 if (value == ~MT_ST_OPTIONS) {
2260 STm->default_blksize = (-1);
2261 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2262 } else {
2263 STm->default_blksize = value;
2264 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2265 name, STm->default_blksize));
2266 if (STp->ready == ST_READY) {
2267 STp->blksize_changed = 0;
2268 set_mode_densblk(STp, STm);
2269 }
2270 }
2271 } else if (code == MT_ST_TIMEOUTS) {
2272 value = (options & ~MT_ST_OPTIONS);
2273 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2274 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2275 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2276 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2277 } else {
2278 blk_queue_rq_timeout(STp->device->request_queue,
2279 value * HZ);
2280 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2281 name, value) );
2282 }
2283 } else if (code == MT_ST_SET_CLN) {
2284 value = (options & ~MT_ST_OPTIONS) & 0xff;
2285 if (value != 0 &&
2286 (value < EXTENDED_SENSE_START ||
2287 value >= SCSI_SENSE_BUFFERSIZE))
2288 return (-EINVAL);
2289 STp->cln_mode = value;
2290 STp->cln_sense_mask = (options >> 8) & 0xff;
2291 STp->cln_sense_value = (options >> 16) & 0xff;
2292 printk(KERN_INFO
2293 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2294 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2295 } else if (code == MT_ST_DEF_OPTIONS) {
2296 code = (options & ~MT_ST_CLEAR_DEFAULT);
2297 value = (options & MT_ST_CLEAR_DEFAULT);
2298 if (code == MT_ST_DEF_DENSITY) {
2299 if (value == MT_ST_CLEAR_DEFAULT) {
2300 STm->default_density = (-1);
2301 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2302 name));
2303 } else {
2304 STm->default_density = value & 0xff;
2305 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2306 name, STm->default_density));
2307 if (STp->ready == ST_READY) {
2308 STp->density_changed = 0;
2309 set_mode_densblk(STp, STm);
2310 }
2311 }
2312 } else if (code == MT_ST_DEF_DRVBUFFER) {
2313 if (value == MT_ST_CLEAR_DEFAULT) {
2314 STp->default_drvbuffer = 0xff;
2315 DEBC( printk(KERN_INFO
2316 "%s: Drive buffer default disabled.\n", name));
2317 } else {
2318 STp->default_drvbuffer = value & 7;
2319 DEBC( printk(KERN_INFO
2320 "%s: Drive buffer default set to %x\n",
2321 name, STp->default_drvbuffer));
2322 if (STp->ready == ST_READY)
2323 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2324 }
2325 } else if (code == MT_ST_DEF_COMPRESSION) {
2326 if (value == MT_ST_CLEAR_DEFAULT) {
2327 STm->default_compression = ST_DONT_TOUCH;
2328 DEBC( printk(KERN_INFO
2329 "%s: Compression default disabled.\n", name));
2330 } else {
2331 if ((value & 0xff00) != 0) {
2332 STp->c_algo = (value & 0xff00) >> 8;
2333 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2334 name, STp->c_algo));
2335 }
2336 if ((value & 0xff) != 0xff) {
2337 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2338 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2339 name, (value & 1)));
2340 if (STp->ready == ST_READY) {
2341 STp->compression_changed = 0;
2342 st_compression(STp, (STm->default_compression == ST_YES));
2343 }
2344 }
2345 }
2346 }
2347 } else
2348 return (-EIO);
2349
2350 return 0;
2351 }
2352 \f
2353 #define MODE_HEADER_LENGTH 4
2354
2355 /* Mode header and page byte offsets */
2356 #define MH_OFF_DATA_LENGTH 0
2357 #define MH_OFF_MEDIUM_TYPE 1
2358 #define MH_OFF_DEV_SPECIFIC 2
2359 #define MH_OFF_BDESCS_LENGTH 3
2360 #define MP_OFF_PAGE_NBR 0
2361 #define MP_OFF_PAGE_LENGTH 1
2362
2363 /* Mode header and page bit masks */
2364 #define MH_BIT_WP 0x80
2365 #define MP_MSK_PAGE_NBR 0x3f
2366
2367 /* Don't return block descriptors */
2368 #define MODE_SENSE_OMIT_BDESCS 0x08
2369
2370 #define MODE_SELECT_PAGE_FORMAT 0x10
2371
2372 /* Read a mode page into the tape buffer. The block descriptors are included
2373 if incl_block_descs is true. The page control is ored to the page number
2374 parameter, if necessary. */
2375 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2376 {
2377 unsigned char cmd[MAX_COMMAND_SIZE];
2378 struct st_request *SRpnt;
2379
2380 memset(cmd, 0, MAX_COMMAND_SIZE);
2381 cmd[0] = MODE_SENSE;
2382 if (omit_block_descs)
2383 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2384 cmd[2] = page;
2385 cmd[4] = 255;
2386
2387 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2388 STp->device->request_queue->rq_timeout, 0, 1);
2389 if (SRpnt == NULL)
2390 return (STp->buffer)->syscall_result;
2391
2392 st_release_request(SRpnt);
2393
2394 return STp->buffer->syscall_result;
2395 }
2396
2397
2398 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2399 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2400 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2401 {
2402 int pgo;
2403 unsigned char cmd[MAX_COMMAND_SIZE];
2404 struct st_request *SRpnt;
2405 int timeout;
2406
2407 memset(cmd, 0, MAX_COMMAND_SIZE);
2408 cmd[0] = MODE_SELECT;
2409 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2410 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2411 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2412
2413 /* Clear reserved fields */
2414 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2415 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2416 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2417 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2418
2419 timeout = slow ?
2420 STp->long_timeout : STp->device->request_queue->rq_timeout;
2421 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2422 timeout, 0, 1);
2423 if (SRpnt == NULL)
2424 return (STp->buffer)->syscall_result;
2425
2426 st_release_request(SRpnt);
2427
2428 return STp->buffer->syscall_result;
2429 }
2430
2431
2432 #define COMPRESSION_PAGE 0x0f
2433 #define COMPRESSION_PAGE_LENGTH 16
2434
2435 #define CP_OFF_DCE_DCC 2
2436 #define CP_OFF_C_ALGO 7
2437
2438 #define DCE_MASK 0x80
2439 #define DCC_MASK 0x40
2440 #define RED_MASK 0x60
2441
2442
2443 /* Control the compression with mode page 15. Algorithm not changed if zero.
2444
2445 The block descriptors are read and written because Sony SDT-7000 does not
2446 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2447 Including block descriptors should not cause any harm to other drives. */
2448
2449 static int st_compression(struct scsi_tape * STp, int state)
2450 {
2451 int retval;
2452 int mpoffs; /* Offset to mode page start */
2453 unsigned char *b_data = (STp->buffer)->b_data;
2454 DEB( char *name = tape_name(STp); )
2455
2456 if (STp->ready != ST_READY)
2457 return (-EIO);
2458
2459 /* Read the current page contents */
2460 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2461 if (retval) {
2462 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2463 name));
2464 return (-EIO);
2465 }
2466
2467 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2468 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2469 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2470
2471 /* Check if compression can be changed */
2472 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2473 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2474 return (-EIO);
2475 }
2476
2477 /* Do the change */
2478 if (state) {
2479 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2480 if (STp->c_algo != 0)
2481 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2482 }
2483 else {
2484 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2485 if (STp->c_algo != 0)
2486 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2487 }
2488
2489 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2490 if (retval) {
2491 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2492 return (-EIO);
2493 }
2494 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2495 name, state));
2496
2497 STp->compression_changed = 1;
2498 return 0;
2499 }
2500
2501
2502 /* Process the load and unload commands (does unload if the load code is zero) */
2503 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2504 {
2505 int retval = (-EIO), timeout;
2506 DEB( char *name = tape_name(STp); )
2507 unsigned char cmd[MAX_COMMAND_SIZE];
2508 struct st_partstat *STps;
2509 struct st_request *SRpnt;
2510
2511 if (STp->ready != ST_READY && !load_code) {
2512 if (STp->ready == ST_NO_TAPE)
2513 return (-ENOMEDIUM);
2514 else
2515 return (-EIO);
2516 }
2517
2518 memset(cmd, 0, MAX_COMMAND_SIZE);
2519 cmd[0] = START_STOP;
2520 if (load_code)
2521 cmd[4] |= 1;
2522 /*
2523 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2524 */
2525 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2526 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2527 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2528 name, (cmd[4]) ? "" : "un",
2529 load_code - MT_ST_HPLOADER_OFFSET));
2530 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2531 }
2532 if (STp->immediate) {
2533 cmd[1] = 1; /* Don't wait for completion */
2534 timeout = STp->device->request_queue->rq_timeout;
2535 }
2536 else
2537 timeout = STp->long_timeout;
2538
2539 DEBC(
2540 if (!load_code)
2541 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2542 else
2543 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2544 );
2545
2546 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2547 timeout, MAX_RETRIES, 1);
2548 if (!SRpnt)
2549 return (STp->buffer)->syscall_result;
2550
2551 retval = (STp->buffer)->syscall_result;
2552 st_release_request(SRpnt);
2553
2554 if (!retval) { /* SCSI command successful */
2555
2556 if (!load_code) {
2557 STp->rew_at_close = 0;
2558 STp->ready = ST_NO_TAPE;
2559 }
2560 else {
2561 STp->rew_at_close = STp->autorew_dev;
2562 retval = check_tape(STp, filp);
2563 if (retval > 0)
2564 retval = 0;
2565 }
2566 }
2567 else {
2568 STps = &(STp->ps[STp->partition]);
2569 STps->drv_file = STps->drv_block = (-1);
2570 }
2571
2572 return retval;
2573 }
2574 \f
2575 #if DEBUG
2576 #define ST_DEB_FORWARD 0
2577 #define ST_DEB_BACKWARD 1
2578 static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2579 {
2580 s32 sc;
2581
2582 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2583 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2584 if (direction)
2585 sc = -sc;
2586 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2587 direction ? "backward" : "forward", sc, units);
2588 }
2589 #endif
2590
2591
2592 /* Internal ioctl function */
2593 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2594 {
2595 int timeout;
2596 long ltmp;
2597 int ioctl_result;
2598 int chg_eof = 1;
2599 unsigned char cmd[MAX_COMMAND_SIZE];
2600 struct st_request *SRpnt;
2601 struct st_partstat *STps;
2602 int fileno, blkno, at_sm, undone;
2603 int datalen = 0, direction = DMA_NONE;
2604 char *name = tape_name(STp);
2605
2606 WARN_ON(STp->buffer->do_dio != 0);
2607 if (STp->ready != ST_READY) {
2608 if (STp->ready == ST_NO_TAPE)
2609 return (-ENOMEDIUM);
2610 else
2611 return (-EIO);
2612 }
2613 timeout = STp->long_timeout;
2614 STps = &(STp->ps[STp->partition]);
2615 fileno = STps->drv_file;
2616 blkno = STps->drv_block;
2617 at_sm = STps->at_sm;
2618
2619 memset(cmd, 0, MAX_COMMAND_SIZE);
2620 switch (cmd_in) {
2621 case MTFSFM:
2622 chg_eof = 0; /* Changed from the FSF after this */
2623 case MTFSF:
2624 cmd[0] = SPACE;
2625 cmd[1] = 0x01; /* Space FileMarks */
2626 cmd[2] = (arg >> 16);
2627 cmd[3] = (arg >> 8);
2628 cmd[4] = arg;
2629 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2630 if (fileno >= 0)
2631 fileno += arg;
2632 blkno = 0;
2633 at_sm &= (arg == 0);
2634 break;
2635 case MTBSFM:
2636 chg_eof = 0; /* Changed from the FSF after this */
2637 case MTBSF:
2638 cmd[0] = SPACE;
2639 cmd[1] = 0x01; /* Space FileMarks */
2640 ltmp = (-arg);
2641 cmd[2] = (ltmp >> 16);
2642 cmd[3] = (ltmp >> 8);
2643 cmd[4] = ltmp;
2644 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2645 if (fileno >= 0)
2646 fileno -= arg;
2647 blkno = (-1); /* We can't know the block number */
2648 at_sm &= (arg == 0);
2649 break;
2650 case MTFSR:
2651 cmd[0] = SPACE;
2652 cmd[1] = 0x00; /* Space Blocks */
2653 cmd[2] = (arg >> 16);
2654 cmd[3] = (arg >> 8);
2655 cmd[4] = arg;
2656 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2657 if (blkno >= 0)
2658 blkno += arg;
2659 at_sm &= (arg == 0);
2660 break;
2661 case MTBSR:
2662 cmd[0] = SPACE;
2663 cmd[1] = 0x00; /* Space Blocks */
2664 ltmp = (-arg);
2665 cmd[2] = (ltmp >> 16);
2666 cmd[3] = (ltmp >> 8);
2667 cmd[4] = ltmp;
2668 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
2669 if (blkno >= 0)
2670 blkno -= arg;
2671 at_sm &= (arg == 0);
2672 break;
2673 case MTFSS:
2674 cmd[0] = SPACE;
2675 cmd[1] = 0x04; /* Space Setmarks */
2676 cmd[2] = (arg >> 16);
2677 cmd[3] = (arg >> 8);
2678 cmd[4] = arg;
2679 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2680 if (arg != 0) {
2681 blkno = fileno = (-1);
2682 at_sm = 1;
2683 }
2684 break;
2685 case MTBSS:
2686 cmd[0] = SPACE;
2687 cmd[1] = 0x04; /* Space Setmarks */
2688 ltmp = (-arg);
2689 cmd[2] = (ltmp >> 16);
2690 cmd[3] = (ltmp >> 8);
2691 cmd[4] = ltmp;
2692 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
2693 if (arg != 0) {
2694 blkno = fileno = (-1);
2695 at_sm = 1;
2696 }
2697 break;
2698 case MTWEOF:
2699 case MTWSM:
2700 if (STp->write_prot)
2701 return (-EACCES);
2702 cmd[0] = WRITE_FILEMARKS;
2703 if (cmd_in == MTWSM)
2704 cmd[1] = 2;
2705 cmd[2] = (arg >> 16);
2706 cmd[3] = (arg >> 8);
2707 cmd[4] = arg;
2708 timeout = STp->device->request_queue->rq_timeout;
2709 DEBC(
2710 if (cmd_in == MTWEOF)
2711 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2712 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2713 else
2714 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2715 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2716 )
2717 if (fileno >= 0)
2718 fileno += arg;
2719 blkno = 0;
2720 at_sm = (cmd_in == MTWSM);
2721 break;
2722 case MTREW:
2723 cmd[0] = REZERO_UNIT;
2724 if (STp->immediate) {
2725 cmd[1] = 1; /* Don't wait for completion */
2726 timeout = STp->device->request_queue->rq_timeout;
2727 }
2728 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2729 fileno = blkno = at_sm = 0;
2730 break;
2731 case MTNOP:
2732 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2733 return 0; /* Should do something ? */
2734 break;
2735 case MTRETEN:
2736 cmd[0] = START_STOP;
2737 if (STp->immediate) {
2738 cmd[1] = 1; /* Don't wait for completion */
2739 timeout = STp->device->request_queue->rq_timeout;
2740 }
2741 cmd[4] = 3;
2742 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2743 fileno = blkno = at_sm = 0;
2744 break;
2745 case MTEOM:
2746 if (!STp->fast_mteom) {
2747 /* space to the end of tape */
2748 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2749 fileno = STps->drv_file;
2750 if (STps->eof >= ST_EOD_1)
2751 return 0;
2752 /* The next lines would hide the number of spaced FileMarks
2753 That's why I inserted the previous lines. I had no luck
2754 with detecting EOM with FSF, so we go now to EOM.
2755 Joerg Weule */
2756 } else
2757 fileno = (-1);
2758 cmd[0] = SPACE;
2759 cmd[1] = 3;
2760 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2761 name));
2762 blkno = -1;
2763 at_sm = 0;
2764 break;
2765 case MTERASE:
2766 if (STp->write_prot)
2767 return (-EACCES);
2768 cmd[0] = ERASE;
2769 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2770 if (STp->immediate) {
2771 cmd[1] |= 2; /* Don't wait for completion */
2772 timeout = STp->device->request_queue->rq_timeout;
2773 }
2774 else
2775 timeout = STp->long_timeout * 8;
2776
2777 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2778 fileno = blkno = at_sm = 0;
2779 break;
2780 case MTSETBLK: /* Set block length */
2781 case MTSETDENSITY: /* Set tape density */
2782 case MTSETDRVBUFFER: /* Set drive buffering */
2783 case SET_DENS_AND_BLK: /* Set density and block size */
2784 chg_eof = 0;
2785 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2786 return (-EIO); /* Not allowed if data in buffer */
2787 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2788 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2789 STp->max_block > 0 &&
2790 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2791 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2792 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2793 return (-EINVAL);
2794 }
2795 cmd[0] = MODE_SELECT;
2796 if ((STp->use_pf & USE_PF))
2797 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2798 cmd[4] = datalen = 12;
2799 direction = DMA_TO_DEVICE;
2800
2801 memset((STp->buffer)->b_data, 0, 12);
2802 if (cmd_in == MTSETDRVBUFFER)
2803 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2804 else
2805 (STp->buffer)->b_data[2] =
2806 STp->drv_buffer << 4;
2807 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2808 if (cmd_in == MTSETDENSITY) {
2809 (STp->buffer)->b_data[4] = arg;
2810 STp->density_changed = 1; /* At least we tried ;-) */
2811 } else if (cmd_in == SET_DENS_AND_BLK)
2812 (STp->buffer)->b_data[4] = arg >> 24;
2813 else
2814 (STp->buffer)->b_data[4] = STp->density;
2815 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2816 ltmp = arg & MT_ST_BLKSIZE_MASK;
2817 if (cmd_in == MTSETBLK)
2818 STp->blksize_changed = 1; /* At least we tried ;-) */
2819 } else
2820 ltmp = STp->block_size;
2821 (STp->buffer)->b_data[9] = (ltmp >> 16);
2822 (STp->buffer)->b_data[10] = (ltmp >> 8);
2823 (STp->buffer)->b_data[11] = ltmp;
2824 timeout = STp->device->request_queue->rq_timeout;
2825 DEBC(
2826 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2827 printk(ST_DEB_MSG
2828 "%s: Setting block size to %d bytes.\n", name,
2829 (STp->buffer)->b_data[9] * 65536 +
2830 (STp->buffer)->b_data[10] * 256 +
2831 (STp->buffer)->b_data[11]);
2832 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2833 printk(ST_DEB_MSG
2834 "%s: Setting density code to %x.\n", name,
2835 (STp->buffer)->b_data[4]);
2836 if (cmd_in == MTSETDRVBUFFER)
2837 printk(ST_DEB_MSG
2838 "%s: Setting drive buffer code to %d.\n", name,
2839 ((STp->buffer)->b_data[2] >> 4) & 7);
2840 )
2841 break;
2842 default:
2843 return (-ENOSYS);
2844 }
2845
2846 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2847 timeout, MAX_RETRIES, 1);
2848 if (!SRpnt)
2849 return (STp->buffer)->syscall_result;
2850
2851 ioctl_result = (STp->buffer)->syscall_result;
2852
2853 if (!ioctl_result) { /* SCSI command successful */
2854 st_release_request(SRpnt);
2855 SRpnt = NULL;
2856 STps->drv_block = blkno;
2857 STps->drv_file = fileno;
2858 STps->at_sm = at_sm;
2859
2860 if (cmd_in == MTBSFM)
2861 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2862 else if (cmd_in == MTFSFM)
2863 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2864
2865 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2866 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2867 if (STp->block_size != 0) {
2868 (STp->buffer)->buffer_blocks =
2869 (STp->buffer)->buffer_size / STp->block_size;
2870 }
2871 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2872 if (cmd_in == SET_DENS_AND_BLK)
2873 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2874 } else if (cmd_in == MTSETDRVBUFFER)
2875 STp->drv_buffer = (arg & 7);
2876 else if (cmd_in == MTSETDENSITY)
2877 STp->density = arg;
2878
2879 if (cmd_in == MTEOM)
2880 STps->eof = ST_EOD;
2881 else if (cmd_in == MTFSF)
2882 STps->eof = ST_FM;
2883 else if (chg_eof)
2884 STps->eof = ST_NOEOF;
2885
2886 if (cmd_in == MTWEOF)
2887 STps->rw = ST_IDLE;
2888 } else { /* SCSI command was not completely successful. Don't return
2889 from this block without releasing the SCSI command block! */
2890 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2891
2892 if (cmdstatp->flags & SENSE_EOM) {
2893 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2894 cmd_in != MTBSR && cmd_in != MTBSS)
2895 STps->eof = ST_EOM_OK;
2896 STps->drv_block = 0;
2897 }
2898
2899 if (cmdstatp->remainder_valid)
2900 undone = (int)cmdstatp->uremainder64;
2901 else
2902 undone = 0;
2903
2904 if (cmd_in == MTWEOF &&
2905 cmdstatp->have_sense &&
2906 (cmdstatp->flags & SENSE_EOM)) {
2907 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2908 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2909 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2910 STps->eof = ST_NOEOF;
2911 } else { /* Writing EOF(s) failed */
2912 if (fileno >= 0)
2913 fileno -= undone;
2914 if (undone < arg)
2915 STps->eof = ST_NOEOF;
2916 }
2917 STps->drv_file = fileno;
2918 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2919 if (fileno >= 0)
2920 STps->drv_file = fileno - undone;
2921 else
2922 STps->drv_file = fileno;
2923 STps->drv_block = -1;
2924 STps->eof = ST_NOEOF;
2925 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2926 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2927 undone = (-undone);
2928 if (STps->drv_file >= 0)
2929 STps->drv_file = fileno + undone;
2930 STps->drv_block = 0;
2931 STps->eof = ST_NOEOF;
2932 } else if (cmd_in == MTFSR) {
2933 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2934 if (STps->drv_file >= 0)
2935 STps->drv_file++;
2936 STps->drv_block = 0;
2937 STps->eof = ST_FM;
2938 } else {
2939 if (blkno >= undone)
2940 STps->drv_block = blkno - undone;
2941 else
2942 STps->drv_block = (-1);
2943 STps->eof = ST_NOEOF;
2944 }
2945 } else if (cmd_in == MTBSR) {
2946 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2947 STps->drv_file--;
2948 STps->drv_block = (-1);
2949 } else {
2950 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2951 undone = (-undone);
2952 if (STps->drv_block >= 0)
2953 STps->drv_block = blkno + undone;
2954 }
2955 STps->eof = ST_NOEOF;
2956 } else if (cmd_in == MTEOM) {
2957 STps->drv_file = (-1);
2958 STps->drv_block = (-1);
2959 STps->eof = ST_EOD;
2960 } else if (cmd_in == MTSETBLK ||
2961 cmd_in == MTSETDENSITY ||
2962 cmd_in == MTSETDRVBUFFER ||
2963 cmd_in == SET_DENS_AND_BLK) {
2964 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2965 !(STp->use_pf & PF_TESTED)) {
2966 /* Try the other possible state of Page Format if not
2967 already tried */
2968 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
2969 st_release_request(SRpnt);
2970 SRpnt = NULL;
2971 return st_int_ioctl(STp, cmd_in, arg);
2972 }
2973 } else if (chg_eof)
2974 STps->eof = ST_NOEOF;
2975
2976 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
2977 STps->eof = ST_EOD;
2978
2979 st_release_request(SRpnt);
2980 SRpnt = NULL;
2981 }
2982
2983 return ioctl_result;
2984 }
2985 \f
2986
2987 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
2988 structure. */
2989
2990 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
2991 int logical)
2992 {
2993 int result;
2994 unsigned char scmd[MAX_COMMAND_SIZE];
2995 struct st_request *SRpnt;
2996 DEB( char *name = tape_name(STp); )
2997
2998 if (STp->ready != ST_READY)
2999 return (-EIO);
3000
3001 memset(scmd, 0, MAX_COMMAND_SIZE);
3002 if ((STp->device)->scsi_level < SCSI_2) {
3003 scmd[0] = QFA_REQUEST_BLOCK;
3004 scmd[4] = 3;
3005 } else {
3006 scmd[0] = READ_POSITION;
3007 if (!logical && !STp->scsi2_logical)
3008 scmd[1] = 1;
3009 }
3010 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3011 STp->device->request_queue->rq_timeout,
3012 MAX_READY_RETRIES, 1);
3013 if (!SRpnt)
3014 return (STp->buffer)->syscall_result;
3015
3016 if ((STp->buffer)->syscall_result != 0 ||
3017 (STp->device->scsi_level >= SCSI_2 &&
3018 ((STp->buffer)->b_data[0] & 4) != 0)) {
3019 *block = *partition = 0;
3020 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3021 result = (-EIO);
3022 } else {
3023 result = 0;
3024 if ((STp->device)->scsi_level < SCSI_2) {
3025 *block = ((STp->buffer)->b_data[0] << 16)
3026 + ((STp->buffer)->b_data[1] << 8)
3027 + (STp->buffer)->b_data[2];
3028 *partition = 0;
3029 } else {
3030 *block = ((STp->buffer)->b_data[4] << 24)
3031 + ((STp->buffer)->b_data[5] << 16)
3032 + ((STp->buffer)->b_data[6] << 8)
3033 + (STp->buffer)->b_data[7];
3034 *partition = (STp->buffer)->b_data[1];
3035 if (((STp->buffer)->b_data[0] & 0x80) &&
3036 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3037 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3038 }
3039 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3040 *block, *partition));
3041 }
3042 st_release_request(SRpnt);
3043 SRpnt = NULL;
3044
3045 return result;
3046 }
3047
3048
3049 /* Set the tape block and partition. Negative partition means that only the
3050 block should be set in vendor specific way. */
3051 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3052 int logical)
3053 {
3054 struct st_partstat *STps;
3055 int result, p;
3056 unsigned int blk;
3057 int timeout;
3058 unsigned char scmd[MAX_COMMAND_SIZE];
3059 struct st_request *SRpnt;
3060 DEB( char *name = tape_name(STp); )
3061
3062 if (STp->ready != ST_READY)
3063 return (-EIO);
3064 timeout = STp->long_timeout;
3065 STps = &(STp->ps[STp->partition]);
3066
3067 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3068 name, block, partition));
3069 DEB(if (partition < 0)
3070 return (-EIO); )
3071
3072 /* Update the location at the partition we are leaving */
3073 if ((!STp->can_partitions && partition != 0) ||
3074 partition >= ST_NBR_PARTITIONS)
3075 return (-EINVAL);
3076 if (partition != STp->partition) {
3077 if (get_location(STp, &blk, &p, 1))
3078 STps->last_block_valid = 0;
3079 else {
3080 STps->last_block_valid = 1;
3081 STps->last_block_visited = blk;
3082 DEBC(printk(ST_DEB_MSG
3083 "%s: Visited block %d for partition %d saved.\n",
3084 name, blk, STp->partition));
3085 }
3086 }
3087
3088 memset(scmd, 0, MAX_COMMAND_SIZE);
3089 if ((STp->device)->scsi_level < SCSI_2) {
3090 scmd[0] = QFA_SEEK_BLOCK;
3091 scmd[2] = (block >> 16);
3092 scmd[3] = (block >> 8);
3093 scmd[4] = block;
3094 scmd[5] = 0;
3095 } else {
3096 scmd[0] = SEEK_10;
3097 scmd[3] = (block >> 24);
3098 scmd[4] = (block >> 16);
3099 scmd[5] = (block >> 8);
3100 scmd[6] = block;
3101 if (!logical && !STp->scsi2_logical)
3102 scmd[1] = 4;
3103 if (STp->partition != partition) {
3104 scmd[1] |= 2;
3105 scmd[8] = partition;
3106 DEBC(printk(ST_DEB_MSG
3107 "%s: Trying to change partition from %d to %d\n",
3108 name, STp->partition, partition));
3109 }
3110 }
3111 if (STp->immediate) {
3112 scmd[1] |= 1; /* Don't wait for completion */
3113 timeout = STp->device->request_queue->rq_timeout;
3114 }
3115
3116 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3117 timeout, MAX_READY_RETRIES, 1);
3118 if (!SRpnt)
3119 return (STp->buffer)->syscall_result;
3120
3121 STps->drv_block = STps->drv_file = (-1);
3122 STps->eof = ST_NOEOF;
3123 if ((STp->buffer)->syscall_result != 0) {
3124 result = (-EIO);
3125 if (STp->can_partitions &&
3126 (STp->device)->scsi_level >= SCSI_2 &&
3127 (p = find_partition(STp)) >= 0)
3128 STp->partition = p;
3129 } else {
3130 if (STp->can_partitions) {
3131 STp->partition = partition;
3132 STps = &(STp->ps[partition]);
3133 if (!STps->last_block_valid ||
3134 STps->last_block_visited != block) {
3135 STps->at_sm = 0;
3136 STps->rw = ST_IDLE;
3137 }
3138 } else
3139 STps->at_sm = 0;
3140 if (block == 0)
3141 STps->drv_block = STps->drv_file = 0;
3142 result = 0;
3143 }
3144
3145 st_release_request(SRpnt);
3146 SRpnt = NULL;
3147
3148 return result;
3149 }
3150
3151
3152 /* Find the current partition number for the drive status. Called from open and
3153 returns either partition number of negative error code. */
3154 static int find_partition(struct scsi_tape *STp)
3155 {
3156 int i, partition;
3157 unsigned int block;
3158
3159 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3160 return i;
3161 if (partition >= ST_NBR_PARTITIONS)
3162 return (-EIO);
3163 return partition;
3164 }
3165
3166
3167 /* Change the partition if necessary */
3168 static int switch_partition(struct scsi_tape *STp)
3169 {
3170 struct st_partstat *STps;
3171
3172 if (STp->partition == STp->new_partition)
3173 return 0;
3174 STps = &(STp->ps[STp->new_partition]);
3175 if (!STps->last_block_valid)
3176 STps->last_block_visited = 0;
3177 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3178 }
3179 \f
3180 /* Functions for reading and writing the medium partition mode page. */
3181
3182 #define PART_PAGE 0x11
3183 #define PART_PAGE_FIXED_LENGTH 8
3184
3185 #define PP_OFF_MAX_ADD_PARTS 2
3186 #define PP_OFF_NBR_ADD_PARTS 3
3187 #define PP_OFF_FLAGS 4
3188 #define PP_OFF_PART_UNITS 6
3189 #define PP_OFF_RESERVED 7
3190
3191 #define PP_BIT_IDP 0x20
3192 #define PP_MSK_PSUM_MB 0x10
3193
3194 /* Get the number of partitions on the tape. As a side effect reads the
3195 mode page into the tape buffer. */
3196 static int nbr_partitions(struct scsi_tape *STp)
3197 {
3198 int result;
3199 DEB( char *name = tape_name(STp); )
3200
3201 if (STp->ready != ST_READY)
3202 return (-EIO);
3203
3204 result = read_mode_page(STp, PART_PAGE, 1);
3205
3206 if (result) {
3207 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3208 name));
3209 result = (-EIO);
3210 } else {
3211 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3212 PP_OFF_NBR_ADD_PARTS] + 1;
3213 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3214 }
3215
3216 return result;
3217 }
3218
3219
3220 /* Partition the tape into two partitions if size > 0 or one partition if
3221 size == 0.
3222
3223 The block descriptors are read and written because Sony SDT-7000 does not
3224 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3225
3226 My HP C1533A drive returns only one partition size field. This is used to
3227 set the size of partition 1. There is no size field for the default partition.
3228 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3229 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3230 The following algorithm is used to accommodate both drives: if the number of
3231 partition size fields is greater than the maximum number of additional partitions
3232 in the mode page, the second field is used. Otherwise the first field is used.
3233
3234 For Seagate DDS drives the page length must be 8 when no partitions is defined
3235 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3236 is acceptable also to some other old drives and enforced if the first partition
3237 size field is used for the first additional partition size.
3238 */
3239 static int partition_tape(struct scsi_tape *STp, int size)
3240 {
3241 char *name = tape_name(STp);
3242 int result;
3243 int pgo, psd_cnt, psdo;
3244 unsigned char *bp;
3245
3246 result = read_mode_page(STp, PART_PAGE, 0);
3247 if (result) {
3248 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3249 return result;
3250 }
3251 /* The mode page is in the buffer. Let's modify it and write it. */
3252 bp = (STp->buffer)->b_data;
3253 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3254 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3255 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3256
3257 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3258 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3259 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3260 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3261 psdo += 2;
3262 }
3263 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3264
3265 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3266 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3267 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3268
3269 if (size <= 0) {
3270 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3271 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3272 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3273 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3274 name));
3275 } else {
3276 bp[psdo] = (size >> 8) & 0xff;
3277 bp[psdo + 1] = size & 0xff;
3278 bp[pgo + 3] = 1;
3279 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3280 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3281 DEBC(printk(ST_DEB_MSG
3282 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3283 name, size));
3284 }
3285 bp[pgo + PP_OFF_PART_UNITS] = 0;
3286 bp[pgo + PP_OFF_RESERVED] = 0;
3287 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3288
3289 result = write_mode_page(STp, PART_PAGE, 1);
3290 if (result) {
3291 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3292 result = (-EIO);
3293 }
3294
3295 return result;
3296 }
3297 \f
3298
3299
3300 /* The ioctl command */
3301 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3302 {
3303 int i, cmd_nr, cmd_type, bt;
3304 int retval = 0;
3305 unsigned int blk;
3306 struct scsi_tape *STp = file->private_data;
3307 struct st_modedef *STm;
3308 struct st_partstat *STps;
3309 char *name = tape_name(STp);
3310 void __user *p = (void __user *)arg;
3311
3312 if (mutex_lock_interruptible(&STp->lock))
3313 return -ERESTARTSYS;
3314
3315 DEB(
3316 if (debugging && !STp->in_use) {
3317 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3318 retval = (-EIO);
3319 goto out;
3320 } ) /* end DEB */
3321
3322 STm = &(STp->modes[STp->current_mode]);
3323 STps = &(STp->ps[STp->partition]);
3324
3325 /*
3326 * If we are in the middle of error recovery, don't let anyone
3327 * else try and use this device. Also, if error recovery fails, it
3328 * may try and take the device offline, in which case all further
3329 * access to the device is prohibited.
3330 */
3331 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3332 file->f_flags & O_NDELAY);
3333 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3334 goto out;
3335 retval = 0;
3336
3337 cmd_type = _IOC_TYPE(cmd_in);
3338 cmd_nr = _IOC_NR(cmd_in);
3339
3340 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3341 struct mtop mtc;
3342
3343 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3344 retval = (-EINVAL);
3345 goto out;
3346 }
3347
3348 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3349 if (i) {
3350 retval = (-EFAULT);
3351 goto out;
3352 }
3353
3354 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3355 printk(KERN_WARNING
3356 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3357 retval = (-EPERM);
3358 goto out;
3359 }
3360 if (!STm->defined &&
3361 (mtc.mt_op != MTSETDRVBUFFER &&
3362 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3363 retval = (-ENXIO);
3364 goto out;
3365 }
3366
3367 if (!STp->pos_unknown) {
3368
3369 if (STps->eof == ST_FM_HIT) {
3370 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3371 mtc.mt_op == MTEOM) {
3372 mtc.mt_count -= 1;
3373 if (STps->drv_file >= 0)
3374 STps->drv_file += 1;
3375 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3376 mtc.mt_count += 1;
3377 if (STps->drv_file >= 0)
3378 STps->drv_file += 1;
3379 }
3380 }
3381
3382 if (mtc.mt_op == MTSEEK) {
3383 /* Old position must be restored if partition will be
3384 changed */
3385 i = !STp->can_partitions ||
3386 (STp->new_partition != STp->partition);
3387 } else {
3388 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3389 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3390 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3391 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3392 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3393 mtc.mt_op == MTCOMPRESSION;
3394 }
3395 i = flush_buffer(STp, i);
3396 if (i < 0) {
3397 retval = i;
3398 goto out;
3399 }
3400 if (STps->rw == ST_WRITING &&
3401 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3402 mtc.mt_op == MTSEEK ||
3403 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3404 i = st_int_ioctl(STp, MTWEOF, 1);
3405 if (i < 0) {
3406 retval = i;
3407 goto out;
3408 }
3409 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3410 mtc.mt_count++;
3411 STps->rw = ST_IDLE;
3412 }
3413
3414 } else {
3415 /*
3416 * If there was a bus reset, block further access
3417 * to this device. If the user wants to rewind the tape,
3418 * then reset the flag and allow access again.
3419 */
3420 if (mtc.mt_op != MTREW &&
3421 mtc.mt_op != MTOFFL &&
3422 mtc.mt_op != MTRETEN &&
3423 mtc.mt_op != MTERASE &&
3424 mtc.mt_op != MTSEEK &&
3425 mtc.mt_op != MTEOM) {
3426 retval = (-EIO);
3427 goto out;
3428 }
3429 reset_state(STp);
3430 /* remove this when the midlevel properly clears was_reset */
3431 STp->device->was_reset = 0;
3432 }
3433
3434 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3435 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3436 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3437 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3438
3439 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3440 do_door_lock(STp, 0); /* Ignore result! */
3441
3442 if (mtc.mt_op == MTSETDRVBUFFER &&
3443 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3444 retval = st_set_options(STp, mtc.mt_count);
3445 goto out;
3446 }
3447
3448 if (mtc.mt_op == MTSETPART) {
3449 if (!STp->can_partitions ||
3450 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3451 retval = (-EINVAL);
3452 goto out;
3453 }
3454 if (mtc.mt_count >= STp->nbr_partitions &&
3455 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3456 retval = (-EIO);
3457 goto out;
3458 }
3459 if (mtc.mt_count >= STp->nbr_partitions) {
3460 retval = (-EINVAL);
3461 goto out;
3462 }
3463 STp->new_partition = mtc.mt_count;
3464 retval = 0;
3465 goto out;
3466 }
3467
3468 if (mtc.mt_op == MTMKPART) {
3469 if (!STp->can_partitions) {
3470 retval = (-EINVAL);
3471 goto out;
3472 }
3473 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3474 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3475 retval = i;
3476 goto out;
3477 }
3478 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3479 STp->ps[i].rw = ST_IDLE;
3480 STp->ps[i].at_sm = 0;
3481 STp->ps[i].last_block_valid = 0;
3482 }
3483 STp->partition = STp->new_partition = 0;
3484 STp->nbr_partitions = 1; /* Bad guess ?-) */
3485 STps->drv_block = STps->drv_file = 0;
3486 retval = 0;
3487 goto out;
3488 }
3489
3490 if (mtc.mt_op == MTSEEK) {
3491 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3492 if (!STp->can_partitions)
3493 STp->ps[0].rw = ST_IDLE;
3494 retval = i;
3495 goto out;
3496 }
3497
3498 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3499 retval = do_load_unload(STp, file, 0);
3500 goto out;
3501 }
3502
3503 if (mtc.mt_op == MTLOAD) {
3504 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3505 goto out;
3506 }
3507
3508 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3509 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3510 goto out;
3511 }
3512
3513 if (STp->can_partitions && STp->ready == ST_READY &&
3514 (i = switch_partition(STp)) < 0) {
3515 retval = i;
3516 goto out;
3517 }
3518
3519 if (mtc.mt_op == MTCOMPRESSION)
3520 retval = st_compression(STp, (mtc.mt_count & 1));
3521 else
3522 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3523 goto out;
3524 }
3525 if (!STm->defined) {
3526 retval = (-ENXIO);
3527 goto out;
3528 }
3529
3530 if ((i = flush_buffer(STp, 0)) < 0) {
3531 retval = i;
3532 goto out;
3533 }
3534 if (STp->can_partitions &&
3535 (i = switch_partition(STp)) < 0) {
3536 retval = i;
3537 goto out;
3538 }
3539
3540 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3541 struct mtget mt_status;
3542
3543 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3544 retval = (-EINVAL);
3545 goto out;
3546 }
3547
3548 mt_status.mt_type = STp->tape_type;
3549 mt_status.mt_dsreg =
3550 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3551 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3552 mt_status.mt_blkno = STps->drv_block;
3553 mt_status.mt_fileno = STps->drv_file;
3554 if (STp->block_size != 0) {
3555 if (STps->rw == ST_WRITING)
3556 mt_status.mt_blkno +=
3557 (STp->buffer)->buffer_bytes / STp->block_size;
3558 else if (STps->rw == ST_READING)
3559 mt_status.mt_blkno -=
3560 ((STp->buffer)->buffer_bytes +
3561 STp->block_size - 1) / STp->block_size;
3562 }
3563
3564 mt_status.mt_gstat = 0;
3565 if (STp->drv_write_prot)
3566 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3567 if (mt_status.mt_blkno == 0) {
3568 if (mt_status.mt_fileno == 0)
3569 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3570 else
3571 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3572 }
3573 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3574 mt_status.mt_resid = STp->partition;
3575 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3576 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3577 else if (STps->eof >= ST_EOM_OK)
3578 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3579 if (STp->density == 1)
3580 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3581 else if (STp->density == 2)
3582 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3583 else if (STp->density == 3)
3584 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3585 if (STp->ready == ST_READY)
3586 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3587 if (STp->ready == ST_NO_TAPE)
3588 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3589 if (STps->at_sm)
3590 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3591 if (STm->do_async_writes ||
3592 (STm->do_buffer_writes && STp->block_size != 0) ||
3593 STp->drv_buffer != 0)
3594 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3595 if (STp->cleaning_req)
3596 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3597
3598 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3599 if (i) {
3600 retval = (-EFAULT);
3601 goto out;
3602 }
3603
3604 STp->recover_reg = 0; /* Clear after read */
3605 retval = 0;
3606 goto out;
3607 } /* End of MTIOCGET */
3608 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3609 struct mtpos mt_pos;
3610 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3611 retval = (-EINVAL);
3612 goto out;
3613 }
3614 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3615 retval = i;
3616 goto out;
3617 }
3618 mt_pos.mt_blkno = blk;
3619 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3620 if (i)
3621 retval = (-EFAULT);
3622 goto out;
3623 }
3624 mutex_unlock(&STp->lock);
3625 switch (cmd_in) {
3626 case SCSI_IOCTL_GET_IDLUN:
3627 case SCSI_IOCTL_GET_BUS_NUMBER:
3628 break;
3629 default:
3630 if ((cmd_in == SG_IO ||
3631 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3632 cmd_in == CDROM_SEND_PACKET) &&
3633 !capable(CAP_SYS_RAWIO))
3634 i = -EPERM;
3635 else
3636 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3637 file->f_mode, cmd_in, p);
3638 if (i != -ENOTTY)
3639 return i;
3640 break;
3641 }
3642 retval = scsi_ioctl(STp->device, cmd_in, p);
3643 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3644 STp->rew_at_close = 0;
3645 STp->ready = ST_NO_TAPE;
3646 }
3647 return retval;
3648
3649 out:
3650 mutex_unlock(&STp->lock);
3651 return retval;
3652 }
3653
3654 #ifdef CONFIG_COMPAT
3655 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3656 {
3657 struct scsi_tape *STp = file->private_data;
3658 struct scsi_device *sdev = STp->device;
3659 int ret = -ENOIOCTLCMD;
3660 if (sdev->host->hostt->compat_ioctl) {
3661
3662 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3663
3664 }
3665 return ret;
3666 }
3667 #endif
3668
3669 \f
3670
3671 /* Try to allocate a new tape buffer. Calling function must not hold
3672 dev_arr_lock. */
3673 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3674 {
3675 struct st_buffer *tb;
3676
3677 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3678 if (!tb) {
3679 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3680 return NULL;
3681 }
3682 tb->frp_segs = 0;
3683 tb->use_sg = max_sg;
3684 tb->dma = need_dma;
3685 tb->buffer_size = 0;
3686
3687 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3688 GFP_ATOMIC);
3689 if (!tb->reserved_pages) {
3690 kfree(tb);
3691 return NULL;
3692 }
3693
3694 return tb;
3695 }
3696
3697
3698 /* Try to allocate enough space in the tape buffer */
3699 #define ST_MAX_ORDER 6
3700
3701 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3702 {
3703 int segs, nbr, max_segs, b_size, order, got;
3704 gfp_t priority;
3705
3706 if (new_size <= STbuffer->buffer_size)
3707 return 1;
3708
3709 if (STbuffer->buffer_size <= PAGE_SIZE)
3710 normalize_buffer(STbuffer); /* Avoid extra segment */
3711
3712 max_segs = STbuffer->use_sg;
3713 nbr = max_segs - STbuffer->frp_segs;
3714 if (nbr <= 0)
3715 return 0;
3716
3717 priority = GFP_KERNEL | __GFP_NOWARN;
3718 if (need_dma)
3719 priority |= GFP_DMA;
3720
3721 if (STbuffer->cleared)
3722 priority |= __GFP_ZERO;
3723
3724 if (STbuffer->frp_segs) {
3725 order = STbuffer->reserved_page_order;
3726 b_size = PAGE_SIZE << order;
3727 } else {
3728 for (b_size = PAGE_SIZE, order = 0;
3729 order < ST_MAX_ORDER && b_size < new_size;
3730 order++, b_size *= 2)
3731 ; /* empty */
3732 }
3733 if (max_segs * (PAGE_SIZE << order) < new_size) {
3734 if (order == ST_MAX_ORDER)
3735 return 0;
3736 normalize_buffer(STbuffer);
3737 return enlarge_buffer(STbuffer, new_size, need_dma);
3738 }
3739
3740 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3741 segs < max_segs && got < new_size;) {
3742 struct page *page;
3743
3744 page = alloc_pages(priority, order);
3745 if (!page) {
3746 DEB(STbuffer->buffer_size = got);
3747 normalize_buffer(STbuffer);
3748 return 0;
3749 }
3750
3751 STbuffer->frp_segs += 1;
3752 got += b_size;
3753 STbuffer->buffer_size = got;
3754 STbuffer->reserved_pages[segs] = page;
3755 segs++;
3756 }
3757 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3758 STbuffer->reserved_page_order = order;
3759
3760 return 1;
3761 }
3762
3763
3764 /* Make sure that no data from previous user is in the internal buffer */
3765 static void clear_buffer(struct st_buffer * st_bp)
3766 {
3767 int i;
3768
3769 for (i=0; i < st_bp->frp_segs; i++)
3770 memset(page_address(st_bp->reserved_pages[i]), 0,
3771 PAGE_SIZE << st_bp->reserved_page_order);
3772 st_bp->cleared = 1;
3773 }
3774
3775
3776 /* Release the extra buffer */
3777 static void normalize_buffer(struct st_buffer * STbuffer)
3778 {
3779 int i, order = STbuffer->reserved_page_order;
3780
3781 for (i = 0; i < STbuffer->frp_segs; i++) {
3782 __free_pages(STbuffer->reserved_pages[i], order);
3783 STbuffer->buffer_size -= (PAGE_SIZE << order);
3784 }
3785 STbuffer->frp_segs = 0;
3786 STbuffer->sg_segs = 0;
3787 STbuffer->reserved_page_order = 0;
3788 STbuffer->map_data.offset = 0;
3789 }
3790
3791
3792 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3793 negative error code. */
3794 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3795 {
3796 int i, cnt, res, offset;
3797 int length = PAGE_SIZE << st_bp->reserved_page_order;
3798
3799 for (i = 0, offset = st_bp->buffer_bytes;
3800 i < st_bp->frp_segs && offset >= length; i++)
3801 offset -= length;
3802 if (i == st_bp->frp_segs) { /* Should never happen */
3803 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3804 return (-EIO);
3805 }
3806 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3807 struct page *page = st_bp->reserved_pages[i];
3808 cnt = length - offset < do_count ? length - offset : do_count;
3809 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3810 if (res)
3811 return (-EFAULT);
3812 do_count -= cnt;
3813 st_bp->buffer_bytes += cnt;
3814 ubp += cnt;
3815 offset = 0;
3816 }
3817 if (do_count) /* Should never happen */
3818 return (-EIO);
3819
3820 return 0;
3821 }
3822
3823
3824 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
3825 negative error code. */
3826 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3827 {
3828 int i, cnt, res, offset;
3829 int length = PAGE_SIZE << st_bp->reserved_page_order;
3830
3831 for (i = 0, offset = st_bp->read_pointer;
3832 i < st_bp->frp_segs && offset >= length; i++)
3833 offset -= length;
3834 if (i == st_bp->frp_segs) { /* Should never happen */
3835 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3836 return (-EIO);
3837 }
3838 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3839 struct page *page = st_bp->reserved_pages[i];
3840 cnt = length - offset < do_count ? length - offset : do_count;
3841 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3842 if (res)
3843 return (-EFAULT);
3844 do_count -= cnt;
3845 st_bp->buffer_bytes -= cnt;
3846 st_bp->read_pointer += cnt;
3847 ubp += cnt;
3848 offset = 0;
3849 }
3850 if (do_count) /* Should never happen */
3851 return (-EIO);
3852
3853 return 0;
3854 }
3855
3856
3857 /* Move data towards start of buffer */
3858 static void move_buffer_data(struct st_buffer * st_bp, int offset)
3859 {
3860 int src_seg, dst_seg, src_offset = 0, dst_offset;
3861 int count, total;
3862 int length = PAGE_SIZE << st_bp->reserved_page_order;
3863
3864 if (offset == 0)
3865 return;
3866
3867 total=st_bp->buffer_bytes - offset;
3868 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3869 src_offset = offset;
3870 if (src_offset < length)
3871 break;
3872 offset -= length;
3873 }
3874
3875 st_bp->buffer_bytes = st_bp->read_pointer = total;
3876 for (dst_seg=dst_offset=0; total > 0; ) {
3877 struct page *dpage = st_bp->reserved_pages[dst_seg];
3878 struct page *spage = st_bp->reserved_pages[src_seg];
3879
3880 count = min(length - dst_offset, length - src_offset);
3881 memmove(page_address(dpage) + dst_offset,
3882 page_address(spage) + src_offset, count);
3883 src_offset += count;
3884 if (src_offset >= length) {
3885 src_seg++;
3886 src_offset = 0;
3887 }
3888 dst_offset += count;
3889 if (dst_offset >= length) {
3890 dst_seg++;
3891 dst_offset = 0;
3892 }
3893 total -= count;
3894 }
3895 }
3896
3897 /* Validate the options from command line or module parameters */
3898 static void validate_options(void)
3899 {
3900 if (buffer_kbs > 0)
3901 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3902 if (max_sg_segs >= ST_FIRST_SG)
3903 st_max_sg_segs = max_sg_segs;
3904 }
3905
3906 #ifndef MODULE
3907 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3908 */
3909 static int __init st_setup(char *str)
3910 {
3911 int i, len, ints[5];
3912 char *stp;
3913
3914 stp = get_options(str, ARRAY_SIZE(ints), ints);
3915
3916 if (ints[0] > 0) {
3917 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3918 if (parms[i].val)
3919 *parms[i].val = ints[i + 1];
3920 } else {
3921 while (stp != NULL) {
3922 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3923 len = strlen(parms[i].name);
3924 if (!strncmp(stp, parms[i].name, len) &&
3925 (*(stp + len) == ':' || *(stp + len) == '=')) {
3926 if (parms[i].val)
3927 *parms[i].val =
3928 simple_strtoul(stp + len + 1, NULL, 0);
3929 else
3930 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3931 parms[i].name);
3932 break;
3933 }
3934 }
3935 if (i >= ARRAY_SIZE(parms))
3936 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3937 stp);
3938 stp = strchr(stp, ',');
3939 if (stp)
3940 stp++;
3941 }
3942 }
3943
3944 validate_options();
3945
3946 return 1;
3947 }
3948
3949 __setup("st=", st_setup);
3950
3951 #endif
3952
3953 static const struct file_operations st_fops =
3954 {
3955 .owner = THIS_MODULE,
3956 .read = st_read,
3957 .write = st_write,
3958 .unlocked_ioctl = st_ioctl,
3959 #ifdef CONFIG_COMPAT
3960 .compat_ioctl = st_compat_ioctl,
3961 #endif
3962 .open = st_open,
3963 .flush = st_flush,
3964 .release = st_release,
3965 .llseek = noop_llseek,
3966 };
3967
3968 static int st_probe(struct device *dev)
3969 {
3970 struct scsi_device *SDp = to_scsi_device(dev);
3971 struct gendisk *disk = NULL;
3972 struct cdev *cdev = NULL;
3973 struct scsi_tape *tpnt = NULL;
3974 struct st_modedef *STm;
3975 struct st_partstat *STps;
3976 struct st_buffer *buffer;
3977 int i, j, mode, dev_num, error;
3978 char *stp;
3979
3980 if (SDp->type != TYPE_TAPE)
3981 return -ENODEV;
3982 if ((stp = st_incompatible(SDp))) {
3983 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
3984 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
3985 return -ENODEV;
3986 }
3987
3988 i = queue_max_segments(SDp->request_queue);
3989 if (st_max_sg_segs < i)
3990 i = st_max_sg_segs;
3991 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
3992 if (buffer == NULL) {
3993 printk(KERN_ERR
3994 "st: Can't allocate new tape buffer. Device not attached.\n");
3995 goto out;
3996 }
3997
3998 disk = alloc_disk(1);
3999 if (!disk) {
4000 printk(KERN_ERR "st: out of memory. Device not attached.\n");
4001 goto out_buffer_free;
4002 }
4003
4004 write_lock(&st_dev_arr_lock);
4005 if (st_nr_dev >= st_dev_max) {
4006 struct scsi_tape **tmp_da;
4007 int tmp_dev_max;
4008
4009 tmp_dev_max = max(st_nr_dev * 2, 8);
4010 if (tmp_dev_max > ST_MAX_TAPES)
4011 tmp_dev_max = ST_MAX_TAPES;
4012 if (tmp_dev_max <= st_nr_dev) {
4013 write_unlock(&st_dev_arr_lock);
4014 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4015 ST_MAX_TAPES);
4016 goto out_put_disk;
4017 }
4018
4019 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
4020 if (tmp_da == NULL) {
4021 write_unlock(&st_dev_arr_lock);
4022 printk(KERN_ERR "st: Can't extend device array.\n");
4023 goto out_put_disk;
4024 }
4025
4026 if (scsi_tapes != NULL) {
4027 memcpy(tmp_da, scsi_tapes,
4028 st_dev_max * sizeof(struct scsi_tape *));
4029 kfree(scsi_tapes);
4030 }
4031 scsi_tapes = tmp_da;
4032
4033 st_dev_max = tmp_dev_max;
4034 }
4035
4036 for (i = 0; i < st_dev_max; i++)
4037 if (scsi_tapes[i] == NULL)
4038 break;
4039 if (i >= st_dev_max)
4040 panic("scsi_devices corrupt (st)");
4041
4042 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4043 if (tpnt == NULL) {
4044 write_unlock(&st_dev_arr_lock);
4045 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4046 goto out_put_disk;
4047 }
4048 kref_init(&tpnt->kref);
4049 tpnt->disk = disk;
4050 sprintf(disk->disk_name, "st%d", i);
4051 disk->private_data = &tpnt->driver;
4052 disk->queue = SDp->request_queue;
4053 tpnt->driver = &st_template;
4054 scsi_tapes[i] = tpnt;
4055 dev_num = i;
4056
4057 tpnt->device = SDp;
4058 if (SDp->scsi_level <= 2)
4059 tpnt->tape_type = MT_ISSCSI1;
4060 else
4061 tpnt->tape_type = MT_ISSCSI2;
4062
4063 tpnt->buffer = buffer;
4064 tpnt->buffer->last_SRpnt = NULL;
4065
4066 tpnt->inited = 0;
4067 tpnt->dirty = 0;
4068 tpnt->in_use = 0;
4069 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4070 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4071 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4072 tpnt->density = 0;
4073 tpnt->do_auto_lock = ST_AUTO_LOCK;
4074 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4075 tpnt->can_partitions = 0;
4076 tpnt->two_fm = ST_TWO_FM;
4077 tpnt->fast_mteom = ST_FAST_MTEOM;
4078 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4079 tpnt->sili = ST_SILI;
4080 tpnt->immediate = ST_NOWAIT;
4081 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4082 tpnt->partition = 0;
4083 tpnt->new_partition = 0;
4084 tpnt->nbr_partitions = 0;
4085 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4086 tpnt->long_timeout = ST_LONG_TIMEOUT;
4087 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4088
4089 for (i = 0; i < ST_NBR_MODES; i++) {
4090 STm = &(tpnt->modes[i]);
4091 STm->defined = 0;
4092 STm->sysv = ST_SYSV;
4093 STm->defaults_for_writes = 0;
4094 STm->do_async_writes = ST_ASYNC_WRITES;
4095 STm->do_buffer_writes = ST_BUFFER_WRITES;
4096 STm->do_read_ahead = ST_READ_AHEAD;
4097 STm->default_compression = ST_DONT_TOUCH;
4098 STm->default_blksize = (-1); /* No forced size */
4099 STm->default_density = (-1); /* No forced density */
4100 }
4101
4102 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4103 STps = &(tpnt->ps[i]);
4104 STps->rw = ST_IDLE;
4105 STps->eof = ST_NOEOF;
4106 STps->at_sm = 0;
4107 STps->last_block_valid = 0;
4108 STps->drv_block = (-1);
4109 STps->drv_file = (-1);
4110 }
4111
4112 tpnt->current_mode = 0;
4113 tpnt->modes[0].defined = 1;
4114
4115 tpnt->density_changed = tpnt->compression_changed =
4116 tpnt->blksize_changed = 0;
4117 mutex_init(&tpnt->lock);
4118
4119 st_nr_dev++;
4120 write_unlock(&st_dev_arr_lock);
4121
4122 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4123 STm = &(tpnt->modes[mode]);
4124 for (j=0; j < 2; j++) {
4125 cdev = cdev_alloc();
4126 if (!cdev) {
4127 printk(KERN_ERR
4128 "st%d: out of memory. Device not attached.\n",
4129 dev_num);
4130 goto out_free_tape;
4131 }
4132 cdev->owner = THIS_MODULE;
4133 cdev->ops = &st_fops;
4134
4135 error = cdev_add(cdev,
4136 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4137 1);
4138 if (error) {
4139 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4140 dev_num, j ? "non" : "auto", mode);
4141 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4142 goto out_free_tape;
4143 }
4144 STm->cdevs[j] = cdev;
4145
4146 }
4147 error = do_create_class_files(tpnt, dev_num, mode);
4148 if (error)
4149 goto out_free_tape;
4150 }
4151
4152 sdev_printk(KERN_NOTICE, SDp,
4153 "Attached scsi tape %s\n", tape_name(tpnt));
4154 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4155 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4156 queue_dma_alignment(SDp->request_queue) + 1);
4157
4158 return 0;
4159
4160 out_free_tape:
4161 for (mode=0; mode < ST_NBR_MODES; mode++) {
4162 STm = &(tpnt->modes[mode]);
4163 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4164 "tape");
4165 for (j=0; j < 2; j++) {
4166 if (STm->cdevs[j]) {
4167 if (cdev == STm->cdevs[j])
4168 cdev = NULL;
4169 device_destroy(st_sysfs_class,
4170 MKDEV(SCSI_TAPE_MAJOR,
4171 TAPE_MINOR(i, mode, j)));
4172 cdev_del(STm->cdevs[j]);
4173 }
4174 }
4175 }
4176 if (cdev)
4177 cdev_del(cdev);
4178 write_lock(&st_dev_arr_lock);
4179 scsi_tapes[dev_num] = NULL;
4180 st_nr_dev--;
4181 write_unlock(&st_dev_arr_lock);
4182 out_put_disk:
4183 put_disk(disk);
4184 kfree(tpnt);
4185 out_buffer_free:
4186 kfree(buffer);
4187 out:
4188 return -ENODEV;
4189 };
4190
4191
4192 static int st_remove(struct device *dev)
4193 {
4194 struct scsi_device *SDp = to_scsi_device(dev);
4195 struct scsi_tape *tpnt;
4196 int i, j, mode;
4197
4198 write_lock(&st_dev_arr_lock);
4199 for (i = 0; i < st_dev_max; i++) {
4200 tpnt = scsi_tapes[i];
4201 if (tpnt != NULL && tpnt->device == SDp) {
4202 scsi_tapes[i] = NULL;
4203 st_nr_dev--;
4204 write_unlock(&st_dev_arr_lock);
4205 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4206 "tape");
4207 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4208 for (j=0; j < 2; j++) {
4209 device_destroy(st_sysfs_class,
4210 MKDEV(SCSI_TAPE_MAJOR,
4211 TAPE_MINOR(i, mode, j)));
4212 cdev_del(tpnt->modes[mode].cdevs[j]);
4213 tpnt->modes[mode].cdevs[j] = NULL;
4214 }
4215 }
4216
4217 mutex_lock(&st_ref_mutex);
4218 kref_put(&tpnt->kref, scsi_tape_release);
4219 mutex_unlock(&st_ref_mutex);
4220 return 0;
4221 }
4222 }
4223
4224 write_unlock(&st_dev_arr_lock);
4225 return 0;
4226 }
4227
4228 /**
4229 * scsi_tape_release - Called to free the Scsi_Tape structure
4230 * @kref: pointer to embedded kref
4231 *
4232 * st_ref_mutex must be held entering this routine. Because it is
4233 * called on last put, you should always use the scsi_tape_get()
4234 * scsi_tape_put() helpers which manipulate the semaphore directly
4235 * and never do a direct kref_put().
4236 **/
4237 static void scsi_tape_release(struct kref *kref)
4238 {
4239 struct scsi_tape *tpnt = to_scsi_tape(kref);
4240 struct gendisk *disk = tpnt->disk;
4241
4242 tpnt->device = NULL;
4243
4244 if (tpnt->buffer) {
4245 normalize_buffer(tpnt->buffer);
4246 kfree(tpnt->buffer->reserved_pages);
4247 kfree(tpnt->buffer);
4248 }
4249
4250 disk->private_data = NULL;
4251 put_disk(disk);
4252 kfree(tpnt);
4253 return;
4254 }
4255
4256 static int __init init_st(void)
4257 {
4258 int err;
4259
4260 validate_options();
4261
4262 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4263 verstr, st_fixed_buffer_size, st_max_sg_segs);
4264
4265 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
4266 if (IS_ERR(st_sysfs_class)) {
4267 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
4268 return PTR_ERR(st_sysfs_class);
4269 }
4270
4271 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4272 ST_MAX_TAPE_ENTRIES, "st");
4273 if (err) {
4274 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4275 SCSI_TAPE_MAJOR);
4276 goto err_class;
4277 }
4278
4279 err = scsi_register_driver(&st_template.gendrv);
4280 if (err)
4281 goto err_chrdev;
4282
4283 err = do_create_sysfs_files();
4284 if (err)
4285 goto err_scsidrv;
4286
4287 return 0;
4288
4289 err_scsidrv:
4290 scsi_unregister_driver(&st_template.gendrv);
4291 err_chrdev:
4292 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4293 ST_MAX_TAPE_ENTRIES);
4294 err_class:
4295 class_destroy(st_sysfs_class);
4296 return err;
4297 }
4298
4299 static void __exit exit_st(void)
4300 {
4301 do_remove_sysfs_files();
4302 scsi_unregister_driver(&st_template.gendrv);
4303 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4304 ST_MAX_TAPE_ENTRIES);
4305 class_destroy(st_sysfs_class);
4306 kfree(scsi_tapes);
4307 printk(KERN_INFO "st: Unloaded.\n");
4308 }
4309
4310 module_init(init_st);
4311 module_exit(exit_st);
4312
4313
4314 /* The sysfs driver interface. Read-only at the moment */
4315 static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4316 {
4317 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4318 }
4319 static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4320
4321 static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4322 {
4323 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4324 }
4325 static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4326
4327 static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4328 {
4329 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4330 }
4331 static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4332
4333 static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4334 {
4335 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4336 }
4337 static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4338
4339 static int do_create_sysfs_files(void)
4340 {
4341 struct device_driver *sysfs = &st_template.gendrv;
4342 int err;
4343
4344 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4345 if (err)
4346 return err;
4347 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4348 if (err)
4349 goto err_try_direct_io;
4350 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4351 if (err)
4352 goto err_attr_fixed_buf;
4353 err = driver_create_file(sysfs, &driver_attr_version);
4354 if (err)
4355 goto err_attr_max_sg;
4356
4357 return 0;
4358
4359 err_attr_max_sg:
4360 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4361 err_attr_fixed_buf:
4362 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4363 err_try_direct_io:
4364 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4365 return err;
4366 }
4367
4368 static void do_remove_sysfs_files(void)
4369 {
4370 struct device_driver *sysfs = &st_template.gendrv;
4371
4372 driver_remove_file(sysfs, &driver_attr_version);
4373 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4374 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4375 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4376 }
4377
4378
4379 /* The sysfs simple class interface */
4380 static ssize_t
4381 st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4382 {
4383 struct st_modedef *STm = dev_get_drvdata(dev);
4384 ssize_t l = 0;
4385
4386 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4387 return l;
4388 }
4389
4390 DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
4391
4392 static ssize_t
4393 st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
4394 {
4395 struct st_modedef *STm = dev_get_drvdata(dev);
4396 ssize_t l = 0;
4397
4398 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4399 return l;
4400 }
4401
4402 DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
4403
4404 static ssize_t
4405 st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
4406 {
4407 struct st_modedef *STm = dev_get_drvdata(dev);
4408 ssize_t l = 0;
4409 char *fmt;
4410
4411 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4412 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4413 return l;
4414 }
4415
4416 DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
4417
4418 static ssize_t
4419 st_defcompression_show(struct device *dev, struct device_attribute *attr,
4420 char *buf)
4421 {
4422 struct st_modedef *STm = dev_get_drvdata(dev);
4423 ssize_t l = 0;
4424
4425 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4426 return l;
4427 }
4428
4429 DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
4430
4431 static ssize_t
4432 st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
4433 {
4434 struct st_modedef *STm = dev_get_drvdata(dev);
4435 struct scsi_tape *STp;
4436 int i, j, options;
4437 ssize_t l = 0;
4438
4439 for (i=0; i < st_dev_max; i++) {
4440 for (j=0; j < ST_NBR_MODES; j++)
4441 if (&scsi_tapes[i]->modes[j] == STm)
4442 break;
4443 if (j < ST_NBR_MODES)
4444 break;
4445 }
4446 if (i == st_dev_max)
4447 return 0; /* should never happen */
4448
4449 STp = scsi_tapes[i];
4450
4451 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4452 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4453 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4454 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4455 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4456 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4457 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4458 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4459 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4460 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4461 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4462 options |= STm->sysv ? MT_ST_SYSV : 0;
4463 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4464 options |= STp->sili ? MT_ST_SILI : 0;
4465
4466 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4467 return l;
4468 }
4469
4470 DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
4471
4472 static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
4473 {
4474 int i, rew, error;
4475 char name[10];
4476 struct device *st_class_member;
4477
4478 for (rew=0; rew < 2; rew++) {
4479 /* Make sure that the minor numbers corresponding to the four
4480 first modes always get the same names */
4481 i = mode << (4 - ST_NBR_MODE_BITS);
4482 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4483 STp->disk->disk_name, st_formats[i]);
4484 st_class_member =
4485 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4486 MKDEV(SCSI_TAPE_MAJOR,
4487 TAPE_MINOR(dev_num, mode, rew)),
4488 &STp->modes[mode], "%s", name);
4489 if (IS_ERR(st_class_member)) {
4490 printk(KERN_WARNING "st%d: device_create failed\n",
4491 dev_num);
4492 error = PTR_ERR(st_class_member);
4493 goto out;
4494 }
4495
4496 error = device_create_file(st_class_member,
4497 &dev_attr_defined);
4498 if (error) goto out;
4499 error = device_create_file(st_class_member,
4500 &dev_attr_default_blksize);
4501 if (error) goto out;
4502 error = device_create_file(st_class_member,
4503 &dev_attr_default_density);
4504 if (error) goto out;
4505 error = device_create_file(st_class_member,
4506 &dev_attr_default_compression);
4507 if (error) goto out;
4508 error = device_create_file(st_class_member,
4509 &dev_attr_options);
4510 if (error) goto out;
4511
4512 if (mode == 0 && rew == 0) {
4513 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4514 &st_class_member->kobj,
4515 "tape");
4516 if (error) {
4517 printk(KERN_ERR
4518 "st%d: Can't create sysfs link from SCSI device.\n",
4519 dev_num);
4520 goto out;
4521 }
4522 }
4523 }
4524
4525 return 0;
4526
4527 out:
4528 return error;
4529 }
4530
4531 /* The following functions may be useful for a larger audience. */
4532 static int sgl_map_user_pages(struct st_buffer *STbp,
4533 const unsigned int max_pages, unsigned long uaddr,
4534 size_t count, int rw)
4535 {
4536 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4537 unsigned long start = uaddr >> PAGE_SHIFT;
4538 const int nr_pages = end - start;
4539 int res, i, j;
4540 struct page **pages;
4541 struct rq_map_data *mdata = &STbp->map_data;
4542
4543 /* User attempted Overflow! */
4544 if ((uaddr + count) < uaddr)
4545 return -EINVAL;
4546
4547 /* Too big */
4548 if (nr_pages > max_pages)
4549 return -ENOMEM;
4550
4551 /* Hmm? */
4552 if (count == 0)
4553 return 0;
4554
4555 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4556 return -ENOMEM;
4557
4558 /* Try to fault in all of the necessary pages */
4559 down_read(&current->mm->mmap_sem);
4560 /* rw==READ means read from drive, write into memory area */
4561 res = get_user_pages(
4562 current,
4563 current->mm,
4564 uaddr,
4565 nr_pages,
4566 rw == READ,
4567 0, /* don't force */
4568 pages,
4569 NULL);
4570 up_read(&current->mm->mmap_sem);
4571
4572 /* Errors and no page mapped should return here */
4573 if (res < nr_pages)
4574 goto out_unmap;
4575
4576 for (i=0; i < nr_pages; i++) {
4577 /* FIXME: flush superflous for rw==READ,
4578 * probably wrong function for rw==WRITE
4579 */
4580 flush_dcache_page(pages[i]);
4581 }
4582
4583 mdata->offset = uaddr & ~PAGE_MASK;
4584 STbp->mapped_pages = pages;
4585
4586 return nr_pages;
4587 out_unmap:
4588 if (res > 0) {
4589 for (j=0; j < res; j++)
4590 page_cache_release(pages[j]);
4591 res = 0;
4592 }
4593 kfree(pages);
4594 return res;
4595 }
4596
4597
4598 /* And unmap them... */
4599 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4600 const unsigned int nr_pages, int dirtied)
4601 {
4602 int i;
4603
4604 for (i=0; i < nr_pages; i++) {
4605 struct page *page = STbp->mapped_pages[i];
4606
4607 if (dirtied)
4608 SetPageDirty(page);
4609 /* FIXME: cache flush missing for rw==READ
4610 * FIXME: call the correct reference counting function
4611 */
4612 page_cache_release(page);
4613 }
4614 kfree(STbp->mapped_pages);
4615 STbp->mapped_pages = NULL;
4616
4617 return 0;
4618 }
linux-next