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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke...
[linux-2.6/mini2440.git] / drivers / scsi / st.c
blob12d58a7ed6bc7dbbaa3a76250c9ab84497f52159
1 /*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
12 Copyright 1992 - 2008 Kai Makisara
13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
20 static const char *verstr = "20081215";
21
22 #include <linux/module.h>
23
24 #include <linux/fs.h>
25 #include <linux/kernel.h>
26 #include <linux/sched.h>
27 #include <linux/mm.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/errno.h>
31 #include <linux/mtio.h>
32 #include <linux/cdrom.h>
33 #include <linux/ioctl.h>
34 #include <linux/fcntl.h>
35 #include <linux/spinlock.h>
36 #include <linux/blkdev.h>
37 #include <linux/moduleparam.h>
38 #include <linux/cdev.h>
39 #include <linux/delay.h>
40 #include <linux/mutex.h>
41 #include <linux/smp_lock.h>
42
43 #include <asm/uaccess.h>
44 #include <asm/dma.h>
45 #include <asm/system.h>
46
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_dbg.h>
49 #include <scsi/scsi_device.h>
50 #include <scsi/scsi_driver.h>
51 #include <scsi/scsi_eh.h>
52 #include <scsi/scsi_host.h>
53 #include <scsi/scsi_ioctl.h>
54 #include <scsi/sg.h>
55
56
57 /* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59 #define DEBUG 0
60
61 #if DEBUG
62 /* The message level for the debug messages is currently set to KERN_NOTICE
63 so that people can easily see the messages. Later when the debugging messages
64 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
65 #define ST_DEB_MSG KERN_NOTICE
66 #define DEB(a) a
67 #define DEBC(a) if (debugging) { a ; }
68 #else
69 #define DEB(a)
70 #define DEBC(a)
71 #endif
72
73 #define ST_KILOBYTE 1024
74
75 #include "st_options.h"
76 #include "st.h"
77
78 static int buffer_kbs;
79 static int max_sg_segs;
80 static int try_direct_io = TRY_DIRECT_IO;
81 static int try_rdio = 1;
82 static int try_wdio = 1;
83
84 static int st_dev_max;
85 static int st_nr_dev;
86
87 static struct class *st_sysfs_class;
88
89 MODULE_AUTHOR("Kai Makisara");
90 MODULE_DESCRIPTION("SCSI tape (st) driver");
91 MODULE_LICENSE("GPL");
92 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
94
95 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
96 * of sysfs parameters (which module_param doesn't yet support).
97 * Sysfs parameters defined explicitly later.
98 */
99 module_param_named(buffer_kbs, buffer_kbs, int, 0);
100 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
101 module_param_named(max_sg_segs, max_sg_segs, int, 0);
102 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
103 module_param_named(try_direct_io, try_direct_io, int, 0);
104 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
105
106 /* Extra parameters for testing */
107 module_param_named(try_rdio, try_rdio, int, 0);
108 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
109 module_param_named(try_wdio, try_wdio, int, 0);
110 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
111
112 #ifndef MODULE
113 static int write_threshold_kbs; /* retained for compatibility */
114 static struct st_dev_parm {
115 char *name;
116 int *val;
117 } parms[] __initdata = {
118 {
119 "buffer_kbs", &buffer_kbs
120 },
121 { /* Retained for compatibility with 2.4 */
122 "write_threshold_kbs", &write_threshold_kbs
123 },
124 {
125 "max_sg_segs", NULL
126 },
127 {
128 "try_direct_io", &try_direct_io
129 }
130 };
131 #endif
132
133 /* Restrict the number of modes so that names for all are assigned */
134 #if ST_NBR_MODES > 16
135 #error "Maximum number of modes is 16"
136 #endif
137 /* Bit reversed order to get same names for same minors with all
138 mode counts */
139 static const char *st_formats[] = {
140 "", "r", "k", "s", "l", "t", "o", "u",
141 "m", "v", "p", "x", "a", "y", "q", "z"};
142
143 /* The default definitions have been moved to st_options.h */
144
145 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
146
147 /* The buffer size should fit into the 24 bits for length in the
148 6-byte SCSI read and write commands. */
149 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
150 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
151 #endif
152
153 static int debugging = DEBUG;
154
155 #define MAX_RETRIES 0
156 #define MAX_WRITE_RETRIES 0
157 #define MAX_READY_RETRIES 0
158 #define NO_TAPE NOT_READY
159
160 #define ST_TIMEOUT (900 * HZ)
161 #define ST_LONG_TIMEOUT (14000 * HZ)
162
163 /* Remove mode bits and auto-rewind bit (7) */
164 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
165 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
166 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
167
168 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
169 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
170 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
171
172 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
173 24 bits) */
174 #define SET_DENS_AND_BLK 0x10001
175
176 static DEFINE_RWLOCK(st_dev_arr_lock);
177
178 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
179 static int st_max_sg_segs = ST_MAX_SG;
180
181 static struct scsi_tape **scsi_tapes = NULL;
182
183 static int modes_defined;
184
185 static int enlarge_buffer(struct st_buffer *, int, int);
186 static void clear_buffer(struct st_buffer *);
187 static void normalize_buffer(struct st_buffer *);
188 static int append_to_buffer(const char __user *, struct st_buffer *, int);
189 static int from_buffer(struct st_buffer *, char __user *, int);
190 static void move_buffer_data(struct st_buffer *, int);
191
192 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
193 unsigned long, size_t, int);
194 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
195
196 static int st_probe(struct device *);
197 static int st_remove(struct device *);
198
199 static int do_create_sysfs_files(void);
200 static void do_remove_sysfs_files(void);
201 static int do_create_class_files(struct scsi_tape *, int, int);
202
203 static struct scsi_driver st_template = {
204 .owner = THIS_MODULE,
205 .gendrv = {
206 .name = "st",
207 .probe = st_probe,
208 .remove = st_remove,
209 },
210 };
211
212 static int st_compression(struct scsi_tape *, int);
213
214 static int find_partition(struct scsi_tape *);
215 static int switch_partition(struct scsi_tape *);
216
217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
219 static void scsi_tape_release(struct kref *);
220
221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
223 static DEFINE_MUTEX(st_ref_mutex);
224
225 \f
226 #include "osst_detect.h"
227 #ifndef SIGS_FROM_OSST
228 #define SIGS_FROM_OSST \
229 {"OnStream", "SC-", "", "osst"}, \
230 {"OnStream", "DI-", "", "osst"}, \
231 {"OnStream", "DP-", "", "osst"}, \
232 {"OnStream", "USB", "", "osst"}, \
233 {"OnStream", "FW-", "", "osst"}
234 #endif
235
236 static struct scsi_tape *scsi_tape_get(int dev)
237 {
238 struct scsi_tape *STp = NULL;
239
240 mutex_lock(&st_ref_mutex);
241 write_lock(&st_dev_arr_lock);
242
243 if (dev < st_dev_max && scsi_tapes != NULL)
244 STp = scsi_tapes[dev];
245 if (!STp) goto out;
246
247 kref_get(&STp->kref);
248
249 if (!STp->device)
250 goto out_put;
251
252 if (scsi_device_get(STp->device))
253 goto out_put;
254
255 goto out;
256
257 out_put:
258 kref_put(&STp->kref, scsi_tape_release);
259 STp = NULL;
260 out:
261 write_unlock(&st_dev_arr_lock);
262 mutex_unlock(&st_ref_mutex);
263 return STp;
264 }
265
266 static void scsi_tape_put(struct scsi_tape *STp)
267 {
268 struct scsi_device *sdev = STp->device;
269
270 mutex_lock(&st_ref_mutex);
271 kref_put(&STp->kref, scsi_tape_release);
272 scsi_device_put(sdev);
273 mutex_unlock(&st_ref_mutex);
274 }
275
276 struct st_reject_data {
277 char *vendor;
278 char *model;
279 char *rev;
280 char *driver_hint; /* Name of the correct driver, NULL if unknown */
281 };
282
283 static struct st_reject_data reject_list[] = {
284 /* {"XXX", "Yy-", "", NULL}, example */
285 SIGS_FROM_OSST,
286 {NULL, }};
287
288 /* If the device signature is on the list of incompatible drives, the
289 function returns a pointer to the name of the correct driver (if known) */
290 static char * st_incompatible(struct scsi_device* SDp)
291 {
292 struct st_reject_data *rp;
293
294 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
295 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
296 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
297 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
298 if (rp->driver_hint)
299 return rp->driver_hint;
300 else
301 return "unknown";
302 }
303 return NULL;
304 }
305 \f
306
307 static inline char *tape_name(struct scsi_tape *tape)
308 {
309 return tape->disk->disk_name;
310 }
311
312
313 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
314 {
315 const u8 *ucp;
316 const u8 *sense = SRpnt->sense;
317
318 s->have_sense = scsi_normalize_sense(SRpnt->sense,
319 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
320 s->flags = 0;
321
322 if (s->have_sense) {
323 s->deferred = 0;
324 s->remainder_valid =
325 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
326 switch (sense[0] & 0x7f) {
327 case 0x71:
328 s->deferred = 1;
329 case 0x70:
330 s->fixed_format = 1;
331 s->flags = sense[2] & 0xe0;
332 break;
333 case 0x73:
334 s->deferred = 1;
335 case 0x72:
336 s->fixed_format = 0;
337 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
338 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
339 break;
340 }
341 }
342 }
343
344
345 /* Convert the result to success code */
346 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
347 {
348 int result = SRpnt->result;
349 u8 scode;
350 DEB(const char *stp;)
351 char *name = tape_name(STp);
352 struct st_cmdstatus *cmdstatp;
353
354 if (!result)
355 return 0;
356
357 cmdstatp = &STp->buffer->cmdstat;
358 st_analyze_sense(SRpnt, cmdstatp);
359
360 if (cmdstatp->have_sense)
361 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
362 else
363 scode = 0;
364
365 DEB(
366 if (debugging) {
367 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
368 name, result,
369 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
370 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
371 if (cmdstatp->have_sense)
372 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
373 } ) /* end DEB */
374 if (!debugging) { /* Abnormal conditions for tape */
375 if (!cmdstatp->have_sense)
376 printk(KERN_WARNING
377 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
378 name, result, driver_byte(result),
379 host_byte(result));
380 else if (cmdstatp->have_sense &&
381 scode != NO_SENSE &&
382 scode != RECOVERED_ERROR &&
383 /* scode != UNIT_ATTENTION && */
384 scode != BLANK_CHECK &&
385 scode != VOLUME_OVERFLOW &&
386 SRpnt->cmd[0] != MODE_SENSE &&
387 SRpnt->cmd[0] != TEST_UNIT_READY) {
388
389 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
390 }
391 }
392
393 if (cmdstatp->fixed_format &&
394 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
395 if (STp->cln_sense_value)
396 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
397 STp->cln_sense_mask) == STp->cln_sense_value);
398 else
399 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
400 STp->cln_sense_mask) != 0);
401 }
402 if (cmdstatp->have_sense &&
403 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
404 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
405
406 STp->pos_unknown |= STp->device->was_reset;
407
408 if (cmdstatp->have_sense &&
409 scode == RECOVERED_ERROR
410 #if ST_RECOVERED_WRITE_FATAL
411 && SRpnt->cmd[0] != WRITE_6
412 && SRpnt->cmd[0] != WRITE_FILEMARKS
413 #endif
414 ) {
415 STp->recover_count++;
416 STp->recover_reg++;
417
418 DEB(
419 if (debugging) {
420 if (SRpnt->cmd[0] == READ_6)
421 stp = "read";
422 else if (SRpnt->cmd[0] == WRITE_6)
423 stp = "write";
424 else
425 stp = "ioctl";
426 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
427 STp->recover_count);
428 } ) /* end DEB */
429
430 if (cmdstatp->flags == 0)
431 return 0;
432 }
433 return (-EIO);
434 }
435
436 static struct st_request *st_allocate_request(struct scsi_tape *stp)
437 {
438 struct st_request *streq;
439
440 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
441 if (streq)
442 streq->stp = stp;
443 else {
444 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
445 tape_name(stp)););
446 if (signal_pending(current))
447 stp->buffer->syscall_result = -EINTR;
448 else
449 stp->buffer->syscall_result = -EBUSY;
450 }
451
452 return streq;
453 }
454
455 static void st_release_request(struct st_request *streq)
456 {
457 kfree(streq);
458 }
459
460 static void st_scsi_execute_end(struct request *req, int uptodate)
461 {
462 struct st_request *SRpnt = req->end_io_data;
463 struct scsi_tape *STp = SRpnt->stp;
464
465 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
466 STp->buffer->cmdstat.residual = req->resid_len;
467
468 if (SRpnt->waiting)
469 complete(SRpnt->waiting);
470
471 blk_rq_unmap_user(SRpnt->bio);
472 __blk_put_request(req->q, req);
473 }
474
475 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
476 int data_direction, void *buffer, unsigned bufflen,
477 int timeout, int retries)
478 {
479 struct request *req;
480 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
481 int err = 0;
482 int write = (data_direction == DMA_TO_DEVICE);
483
484 req = blk_get_request(SRpnt->stp->device->request_queue, write,
485 GFP_KERNEL);
486 if (!req)
487 return DRIVER_ERROR << 24;
488
489 req->cmd_type = REQ_TYPE_BLOCK_PC;
490 req->cmd_flags |= REQ_QUIET;
491
492 mdata->null_mapped = 1;
493
494 if (bufflen) {
495 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
496 GFP_KERNEL);
497 if (err) {
498 blk_put_request(req);
499 return DRIVER_ERROR << 24;
500 }
501 }
502
503 SRpnt->bio = req->bio;
504 req->cmd_len = COMMAND_SIZE(cmd[0]);
505 memset(req->cmd, 0, BLK_MAX_CDB);
506 memcpy(req->cmd, cmd, req->cmd_len);
507 req->sense = SRpnt->sense;
508 req->sense_len = 0;
509 req->timeout = timeout;
510 req->retries = retries;
511 req->end_io_data = SRpnt;
512
513 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
514 return 0;
515 }
516
517 /* Do the scsi command. Waits until command performed if do_wait is true.
518 Otherwise write_behind_check() is used to check that the command
519 has finished. */
520 static struct st_request *
521 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
522 int bytes, int direction, int timeout, int retries, int do_wait)
523 {
524 struct completion *waiting;
525 struct rq_map_data *mdata = &STp->buffer->map_data;
526 int ret;
527
528 /* if async, make sure there's no command outstanding */
529 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
530 printk(KERN_ERR "%s: Async command already active.\n",
531 tape_name(STp));
532 if (signal_pending(current))
533 (STp->buffer)->syscall_result = (-EINTR);
534 else
535 (STp->buffer)->syscall_result = (-EBUSY);
536 return NULL;
537 }
538
539 if (!SRpnt) {
540 SRpnt = st_allocate_request(STp);
541 if (!SRpnt)
542 return NULL;
543 }
544
545 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
546 which IO is outstanding. It's nulled out when the IO completes. */
547 if (!do_wait)
548 (STp->buffer)->last_SRpnt = SRpnt;
549
550 waiting = &STp->wait;
551 init_completion(waiting);
552 SRpnt->waiting = waiting;
553
554 if (STp->buffer->do_dio) {
555 mdata->nr_entries = STp->buffer->sg_segs;
556 mdata->pages = STp->buffer->mapped_pages;
557 } else {
558 mdata->nr_entries =
559 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
560 STp->buffer->map_data.pages = STp->buffer->reserved_pages;
561 STp->buffer->map_data.offset = 0;
562 }
563
564 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
565 STp->buffer->cmdstat.have_sense = 0;
566 STp->buffer->syscall_result = 0;
567
568 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
569 retries);
570 if (ret) {
571 /* could not allocate the buffer or request was too large */
572 (STp->buffer)->syscall_result = (-EBUSY);
573 (STp->buffer)->last_SRpnt = NULL;
574 } else if (do_wait) {
575 wait_for_completion(waiting);
576 SRpnt->waiting = NULL;
577 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
578 }
579
580 return SRpnt;
581 }
582
583
584 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
585 write has been correct but EOM early warning reached, -EIO if write ended in
586 error or zero if write successful. Asynchronous writes are used only in
587 variable block mode. */
588 static int write_behind_check(struct scsi_tape * STp)
589 {
590 int retval = 0;
591 struct st_buffer *STbuffer;
592 struct st_partstat *STps;
593 struct st_cmdstatus *cmdstatp;
594 struct st_request *SRpnt;
595
596 STbuffer = STp->buffer;
597 if (!STbuffer->writing)
598 return 0;
599
600 DEB(
601 if (STp->write_pending)
602 STp->nbr_waits++;
603 else
604 STp->nbr_finished++;
605 ) /* end DEB */
606
607 wait_for_completion(&(STp->wait));
608 SRpnt = STbuffer->last_SRpnt;
609 STbuffer->last_SRpnt = NULL;
610 SRpnt->waiting = NULL;
611
612 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
613 st_release_request(SRpnt);
614
615 STbuffer->buffer_bytes -= STbuffer->writing;
616 STps = &(STp->ps[STp->partition]);
617 if (STps->drv_block >= 0) {
618 if (STp->block_size == 0)
619 STps->drv_block++;
620 else
621 STps->drv_block += STbuffer->writing / STp->block_size;
622 }
623
624 cmdstatp = &STbuffer->cmdstat;
625 if (STbuffer->syscall_result) {
626 retval = -EIO;
627 if (cmdstatp->have_sense && !cmdstatp->deferred &&
628 (cmdstatp->flags & SENSE_EOM) &&
629 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
630 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
631 /* EOM at write-behind, has all data been written? */
632 if (!cmdstatp->remainder_valid ||
633 cmdstatp->uremainder64 == 0)
634 retval = -ENOSPC;
635 }
636 if (retval == -EIO)
637 STps->drv_block = -1;
638 }
639 STbuffer->writing = 0;
640
641 DEB(if (debugging && retval)
642 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
643 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
644
645 return retval;
646 }
647
648
649 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
650 it messes up the block number). */
651 static int cross_eof(struct scsi_tape * STp, int forward)
652 {
653 struct st_request *SRpnt;
654 unsigned char cmd[MAX_COMMAND_SIZE];
655
656 cmd[0] = SPACE;
657 cmd[1] = 0x01; /* Space FileMarks */
658 if (forward) {
659 cmd[2] = cmd[3] = 0;
660 cmd[4] = 1;
661 } else
662 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
663 cmd[5] = 0;
664
665 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
666 tape_name(STp), forward ? "forward" : "backward"));
667
668 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
669 STp->device->request_queue->rq_timeout,
670 MAX_RETRIES, 1);
671 if (!SRpnt)
672 return (STp->buffer)->syscall_result;
673
674 st_release_request(SRpnt);
675 SRpnt = NULL;
676
677 if ((STp->buffer)->cmdstat.midlevel_result != 0)
678 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
679 tape_name(STp), forward ? "forward" : "backward");
680
681 return (STp->buffer)->syscall_result;
682 }
683
684
685 /* Flush the write buffer (never need to write if variable blocksize). */
686 static int st_flush_write_buffer(struct scsi_tape * STp)
687 {
688 int transfer, blks;
689 int result;
690 unsigned char cmd[MAX_COMMAND_SIZE];
691 struct st_request *SRpnt;
692 struct st_partstat *STps;
693
694 result = write_behind_check(STp);
695 if (result)
696 return result;
697
698 result = 0;
699 if (STp->dirty == 1) {
700
701 transfer = STp->buffer->buffer_bytes;
702 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
703 tape_name(STp), transfer));
704
705 memset(cmd, 0, MAX_COMMAND_SIZE);
706 cmd[0] = WRITE_6;
707 cmd[1] = 1;
708 blks = transfer / STp->block_size;
709 cmd[2] = blks >> 16;
710 cmd[3] = blks >> 8;
711 cmd[4] = blks;
712
713 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
714 STp->device->request_queue->rq_timeout,
715 MAX_WRITE_RETRIES, 1);
716 if (!SRpnt)
717 return (STp->buffer)->syscall_result;
718
719 STps = &(STp->ps[STp->partition]);
720 if ((STp->buffer)->syscall_result != 0) {
721 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
722
723 if (cmdstatp->have_sense && !cmdstatp->deferred &&
724 (cmdstatp->flags & SENSE_EOM) &&
725 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
726 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
727 (!cmdstatp->remainder_valid ||
728 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
729 STp->dirty = 0;
730 (STp->buffer)->buffer_bytes = 0;
731 if (STps->drv_block >= 0)
732 STps->drv_block += blks;
733 result = (-ENOSPC);
734 } else {
735 printk(KERN_ERR "%s: Error on flush.\n",
736 tape_name(STp));
737 STps->drv_block = (-1);
738 result = (-EIO);
739 }
740 } else {
741 if (STps->drv_block >= 0)
742 STps->drv_block += blks;
743 STp->dirty = 0;
744 (STp->buffer)->buffer_bytes = 0;
745 }
746 st_release_request(SRpnt);
747 SRpnt = NULL;
748 }
749 return result;
750 }
751
752
753 /* Flush the tape buffer. The tape will be positioned correctly unless
754 seek_next is true. */
755 static int flush_buffer(struct scsi_tape *STp, int seek_next)
756 {
757 int backspace, result;
758 struct st_buffer *STbuffer;
759 struct st_partstat *STps;
760
761 STbuffer = STp->buffer;
762
763 /*
764 * If there was a bus reset, block further access
765 * to this device.
766 */
767 if (STp->pos_unknown)
768 return (-EIO);
769
770 if (STp->ready != ST_READY)
771 return 0;
772 STps = &(STp->ps[STp->partition]);
773 if (STps->rw == ST_WRITING) /* Writing */
774 return st_flush_write_buffer(STp);
775
776 if (STp->block_size == 0)
777 return 0;
778
779 backspace = ((STp->buffer)->buffer_bytes +
780 (STp->buffer)->read_pointer) / STp->block_size -
781 ((STp->buffer)->read_pointer + STp->block_size - 1) /
782 STp->block_size;
783 (STp->buffer)->buffer_bytes = 0;
784 (STp->buffer)->read_pointer = 0;
785 result = 0;
786 if (!seek_next) {
787 if (STps->eof == ST_FM_HIT) {
788 result = cross_eof(STp, 0); /* Back over the EOF hit */
789 if (!result)
790 STps->eof = ST_NOEOF;
791 else {
792 if (STps->drv_file >= 0)
793 STps->drv_file++;
794 STps->drv_block = 0;
795 }
796 }
797 if (!result && backspace > 0)
798 result = st_int_ioctl(STp, MTBSR, backspace);
799 } else if (STps->eof == ST_FM_HIT) {
800 if (STps->drv_file >= 0)
801 STps->drv_file++;
802 STps->drv_block = 0;
803 STps->eof = ST_NOEOF;
804 }
805 return result;
806
807 }
808 \f
809 /* Set the mode parameters */
810 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
811 {
812 int set_it = 0;
813 unsigned long arg;
814 char *name = tape_name(STp);
815
816 if (!STp->density_changed &&
817 STm->default_density >= 0 &&
818 STm->default_density != STp->density) {
819 arg = STm->default_density;
820 set_it = 1;
821 } else
822 arg = STp->density;
823 arg <<= MT_ST_DENSITY_SHIFT;
824 if (!STp->blksize_changed &&
825 STm->default_blksize >= 0 &&
826 STm->default_blksize != STp->block_size) {
827 arg |= STm->default_blksize;
828 set_it = 1;
829 } else
830 arg |= STp->block_size;
831 if (set_it &&
832 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
833 printk(KERN_WARNING
834 "%s: Can't set default block size to %d bytes and density %x.\n",
835 name, STm->default_blksize, STm->default_density);
836 if (modes_defined)
837 return (-EINVAL);
838 }
839 return 0;
840 }
841
842
843 /* Lock or unlock the drive door. Don't use when st_request allocated. */
844 static int do_door_lock(struct scsi_tape * STp, int do_lock)
845 {
846 int retval, cmd;
847 DEB(char *name = tape_name(STp);)
848
849
850 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
851 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
852 do_lock ? "L" : "Unl"));
853 retval = scsi_ioctl(STp->device, cmd, NULL);
854 if (!retval) {
855 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
856 }
857 else {
858 STp->door_locked = ST_LOCK_FAILS;
859 }
860 return retval;
861 }
862
863
864 /* Set the internal state after reset */
865 static void reset_state(struct scsi_tape *STp)
866 {
867 int i;
868 struct st_partstat *STps;
869
870 STp->pos_unknown = 0;
871 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
872 STps = &(STp->ps[i]);
873 STps->rw = ST_IDLE;
874 STps->eof = ST_NOEOF;
875 STps->at_sm = 0;
876 STps->last_block_valid = 0;
877 STps->drv_block = -1;
878 STps->drv_file = -1;
879 }
880 if (STp->can_partitions) {
881 STp->partition = find_partition(STp);
882 if (STp->partition < 0)
883 STp->partition = 0;
884 STp->new_partition = STp->partition;
885 }
886 }
887 \f
888 /* Test if the drive is ready. Returns either one of the codes below or a negative system
889 error code. */
890 #define CHKRES_READY 0
891 #define CHKRES_NEW_SESSION 1
892 #define CHKRES_NOT_READY 2
893 #define CHKRES_NO_TAPE 3
894
895 #define MAX_ATTENTIONS 10
896
897 static int test_ready(struct scsi_tape *STp, int do_wait)
898 {
899 int attentions, waits, max_wait, scode;
900 int retval = CHKRES_READY, new_session = 0;
901 unsigned char cmd[MAX_COMMAND_SIZE];
902 struct st_request *SRpnt = NULL;
903 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
904
905 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
906
907 for (attentions=waits=0; ; ) {
908 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
909 cmd[0] = TEST_UNIT_READY;
910 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
911 STp->long_timeout, MAX_READY_RETRIES, 1);
912
913 if (!SRpnt) {
914 retval = (STp->buffer)->syscall_result;
915 break;
916 }
917
918 if (cmdstatp->have_sense) {
919
920 scode = cmdstatp->sense_hdr.sense_key;
921
922 if (scode == UNIT_ATTENTION) { /* New media? */
923 new_session = 1;
924 if (attentions < MAX_ATTENTIONS) {
925 attentions++;
926 continue;
927 }
928 else {
929 retval = (-EIO);
930 break;
931 }
932 }
933
934 if (scode == NOT_READY) {
935 if (waits < max_wait) {
936 if (msleep_interruptible(1000)) {
937 retval = (-EINTR);
938 break;
939 }
940 waits++;
941 continue;
942 }
943 else {
944 if ((STp->device)->scsi_level >= SCSI_2 &&
945 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
946 retval = CHKRES_NO_TAPE;
947 else
948 retval = CHKRES_NOT_READY;
949 break;
950 }
951 }
952 }
953
954 retval = (STp->buffer)->syscall_result;
955 if (!retval)
956 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
957 break;
958 }
959
960 if (SRpnt != NULL)
961 st_release_request(SRpnt);
962 return retval;
963 }
964
965
966 /* See if the drive is ready and gather information about the tape. Return values:
967 < 0 negative error code from errno.h
968 0 drive ready
969 1 drive not ready (possibly no tape)
970 */
971 static int check_tape(struct scsi_tape *STp, struct file *filp)
972 {
973 int i, retval, new_session = 0, do_wait;
974 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
975 unsigned short st_flags = filp->f_flags;
976 struct st_request *SRpnt = NULL;
977 struct st_modedef *STm;
978 struct st_partstat *STps;
979 char *name = tape_name(STp);
980 struct inode *inode = filp->f_path.dentry->d_inode;
981 int mode = TAPE_MODE(inode);
982
983 STp->ready = ST_READY;
984
985 if (mode != STp->current_mode) {
986 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
987 name, STp->current_mode, mode));
988 new_session = 1;
989 STp->current_mode = mode;
990 }
991 STm = &(STp->modes[STp->current_mode]);
992
993 saved_cleaning = STp->cleaning_req;
994 STp->cleaning_req = 0;
995
996 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
997 retval = test_ready(STp, do_wait);
998
999 if (retval < 0)
1000 goto err_out;
1001
1002 if (retval == CHKRES_NEW_SESSION) {
1003 STp->pos_unknown = 0;
1004 STp->partition = STp->new_partition = 0;
1005 if (STp->can_partitions)
1006 STp->nbr_partitions = 1; /* This guess will be updated later
1007 if necessary */
1008 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1009 STps = &(STp->ps[i]);
1010 STps->rw = ST_IDLE;
1011 STps->eof = ST_NOEOF;
1012 STps->at_sm = 0;
1013 STps->last_block_valid = 0;
1014 STps->drv_block = 0;
1015 STps->drv_file = 0;
1016 }
1017 new_session = 1;
1018 }
1019 else {
1020 STp->cleaning_req |= saved_cleaning;
1021
1022 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1023 if (retval == CHKRES_NO_TAPE)
1024 STp->ready = ST_NO_TAPE;
1025 else
1026 STp->ready = ST_NOT_READY;
1027
1028 STp->density = 0; /* Clear the erroneous "residue" */
1029 STp->write_prot = 0;
1030 STp->block_size = 0;
1031 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1032 STp->partition = STp->new_partition = 0;
1033 STp->door_locked = ST_UNLOCKED;
1034 return CHKRES_NOT_READY;
1035 }
1036 }
1037
1038 if (STp->omit_blklims)
1039 STp->min_block = STp->max_block = (-1);
1040 else {
1041 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1042 cmd[0] = READ_BLOCK_LIMITS;
1043
1044 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1045 STp->device->request_queue->rq_timeout,
1046 MAX_READY_RETRIES, 1);
1047 if (!SRpnt) {
1048 retval = (STp->buffer)->syscall_result;
1049 goto err_out;
1050 }
1051
1052 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1053 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1054 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1055 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1056 (STp->buffer)->b_data[5];
1057 if ( DEB( debugging || ) !STp->inited)
1058 printk(KERN_INFO
1059 "%s: Block limits %d - %d bytes.\n", name,
1060 STp->min_block, STp->max_block);
1061 } else {
1062 STp->min_block = STp->max_block = (-1);
1063 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1064 name));
1065 }
1066 }
1067
1068 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1069 cmd[0] = MODE_SENSE;
1070 cmd[4] = 12;
1071
1072 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1073 STp->device->request_queue->rq_timeout,
1074 MAX_READY_RETRIES, 1);
1075 if (!SRpnt) {
1076 retval = (STp->buffer)->syscall_result;
1077 goto err_out;
1078 }
1079
1080 if ((STp->buffer)->syscall_result != 0) {
1081 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1082 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1083 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1084 STp->drv_write_prot = 0;
1085 } else {
1086 DEBC(printk(ST_DEB_MSG
1087 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1088 name,
1089 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1090 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1091
1092 if ((STp->buffer)->b_data[3] >= 8) {
1093 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1094 STp->density = (STp->buffer)->b_data[4];
1095 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1096 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1097 DEBC(printk(ST_DEB_MSG
1098 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1099 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1100 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1101 STp->drv_buffer));
1102 }
1103 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1104 }
1105 st_release_request(SRpnt);
1106 SRpnt = NULL;
1107 STp->inited = 1;
1108
1109 if (STp->block_size > 0)
1110 (STp->buffer)->buffer_blocks =
1111 (STp->buffer)->buffer_size / STp->block_size;
1112 else
1113 (STp->buffer)->buffer_blocks = 1;
1114 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1115
1116 DEBC(printk(ST_DEB_MSG
1117 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1118 STp->block_size, (STp->buffer)->buffer_size,
1119 (STp->buffer)->buffer_blocks));
1120
1121 if (STp->drv_write_prot) {
1122 STp->write_prot = 1;
1123
1124 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1125
1126 if (do_wait &&
1127 ((st_flags & O_ACCMODE) == O_WRONLY ||
1128 (st_flags & O_ACCMODE) == O_RDWR)) {
1129 retval = (-EROFS);
1130 goto err_out;
1131 }
1132 }
1133
1134 if (STp->can_partitions && STp->nbr_partitions < 1) {
1135 /* This code is reached when the device is opened for the first time
1136 after the driver has been initialized with tape in the drive and the
1137 partition support has been enabled. */
1138 DEBC(printk(ST_DEB_MSG
1139 "%s: Updating partition number in status.\n", name));
1140 if ((STp->partition = find_partition(STp)) < 0) {
1141 retval = STp->partition;
1142 goto err_out;
1143 }
1144 STp->new_partition = STp->partition;
1145 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1146 }
1147
1148 if (new_session) { /* Change the drive parameters for the new mode */
1149 STp->density_changed = STp->blksize_changed = 0;
1150 STp->compression_changed = 0;
1151 if (!(STm->defaults_for_writes) &&
1152 (retval = set_mode_densblk(STp, STm)) < 0)
1153 goto err_out;
1154
1155 if (STp->default_drvbuffer != 0xff) {
1156 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1157 printk(KERN_WARNING
1158 "%s: Can't set default drive buffering to %d.\n",
1159 name, STp->default_drvbuffer);
1160 }
1161 }
1162
1163 return CHKRES_READY;
1164
1165 err_out:
1166 return retval;
1167 }
1168
1169
1170 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1171 module count. */
1172 static int st_open(struct inode *inode, struct file *filp)
1173 {
1174 int i, retval = (-EIO);
1175 struct scsi_tape *STp;
1176 struct st_partstat *STps;
1177 int dev = TAPE_NR(inode);
1178 char *name;
1179
1180 lock_kernel();
1181 /*
1182 * We really want to do nonseekable_open(inode, filp); here, but some
1183 * versions of tar incorrectly call lseek on tapes and bail out if that
1184 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1185 */
1186 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1187
1188 if (!(STp = scsi_tape_get(dev))) {
1189 unlock_kernel();
1190 return -ENXIO;
1191 }
1192
1193 write_lock(&st_dev_arr_lock);
1194 filp->private_data = STp;
1195 name = tape_name(STp);
1196
1197 if (STp->in_use) {
1198 write_unlock(&st_dev_arr_lock);
1199 scsi_tape_put(STp);
1200 unlock_kernel();
1201 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1202 return (-EBUSY);
1203 }
1204
1205 STp->in_use = 1;
1206 write_unlock(&st_dev_arr_lock);
1207 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1208
1209 if (!scsi_block_when_processing_errors(STp->device)) {
1210 retval = (-ENXIO);
1211 goto err_out;
1212 }
1213
1214 /* See that we have at least a one page buffer available */
1215 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1216 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1217 name);
1218 retval = (-EOVERFLOW);
1219 goto err_out;
1220 }
1221
1222 (STp->buffer)->cleared = 0;
1223 (STp->buffer)->writing = 0;
1224 (STp->buffer)->syscall_result = 0;
1225
1226 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1227
1228 STp->dirty = 0;
1229 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1230 STps = &(STp->ps[i]);
1231 STps->rw = ST_IDLE;
1232 }
1233 STp->try_dio_now = STp->try_dio;
1234 STp->recover_count = 0;
1235 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1236 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1237
1238 retval = check_tape(STp, filp);
1239 if (retval < 0)
1240 goto err_out;
1241 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1242 retval != CHKRES_READY) {
1243 if (STp->ready == NO_TAPE)
1244 retval = (-ENOMEDIUM);
1245 else
1246 retval = (-EIO);
1247 goto err_out;
1248 }
1249 unlock_kernel();
1250 return 0;
1251
1252 err_out:
1253 normalize_buffer(STp->buffer);
1254 STp->in_use = 0;
1255 scsi_tape_put(STp);
1256 unlock_kernel();
1257 return retval;
1258
1259 }
1260 \f
1261
1262 /* Flush the tape buffer before close */
1263 static int st_flush(struct file *filp, fl_owner_t id)
1264 {
1265 int result = 0, result2;
1266 unsigned char cmd[MAX_COMMAND_SIZE];
1267 struct st_request *SRpnt;
1268 struct scsi_tape *STp = filp->private_data;
1269 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1270 struct st_partstat *STps = &(STp->ps[STp->partition]);
1271 char *name = tape_name(STp);
1272
1273 if (file_count(filp) > 1)
1274 return 0;
1275
1276 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1277 result = st_flush_write_buffer(STp);
1278 if (result != 0 && result != (-ENOSPC))
1279 goto out;
1280 }
1281
1282 if (STp->can_partitions &&
1283 (result2 = switch_partition(STp)) < 0) {
1284 DEBC(printk(ST_DEB_MSG
1285 "%s: switch_partition at close failed.\n", name));
1286 if (result == 0)
1287 result = result2;
1288 goto out;
1289 }
1290
1291 DEBC( if (STp->nbr_requests)
1292 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1293 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1294
1295 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1296 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1297
1298 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1299 name, STp->nbr_waits, STp->nbr_finished);
1300 )
1301
1302 memset(cmd, 0, MAX_COMMAND_SIZE);
1303 cmd[0] = WRITE_FILEMARKS;
1304 cmd[4] = 1 + STp->two_fm;
1305
1306 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1307 STp->device->request_queue->rq_timeout,
1308 MAX_WRITE_RETRIES, 1);
1309 if (!SRpnt) {
1310 result = (STp->buffer)->syscall_result;
1311 goto out;
1312 }
1313
1314 if (STp->buffer->syscall_result == 0 ||
1315 (cmdstatp->have_sense && !cmdstatp->deferred &&
1316 (cmdstatp->flags & SENSE_EOM) &&
1317 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1318 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1319 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1320 /* Write successful at EOM */
1321 st_release_request(SRpnt);
1322 SRpnt = NULL;
1323 if (STps->drv_file >= 0)
1324 STps->drv_file++;
1325 STps->drv_block = 0;
1326 if (STp->two_fm)
1327 cross_eof(STp, 0);
1328 STps->eof = ST_FM;
1329 }
1330 else { /* Write error */
1331 st_release_request(SRpnt);
1332 SRpnt = NULL;
1333 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1334 if (result == 0)
1335 result = (-EIO);
1336 }
1337
1338 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1339 name, cmd[4]));
1340 } else if (!STp->rew_at_close) {
1341 STps = &(STp->ps[STp->partition]);
1342 if (!STm->sysv || STps->rw != ST_READING) {
1343 if (STp->can_bsr)
1344 result = flush_buffer(STp, 0);
1345 else if (STps->eof == ST_FM_HIT) {
1346 result = cross_eof(STp, 0);
1347 if (result) {
1348 if (STps->drv_file >= 0)
1349 STps->drv_file++;
1350 STps->drv_block = 0;
1351 STps->eof = ST_FM;
1352 } else
1353 STps->eof = ST_NOEOF;
1354 }
1355 } else if ((STps->eof == ST_NOEOF &&
1356 !(result = cross_eof(STp, 1))) ||
1357 STps->eof == ST_FM_HIT) {
1358 if (STps->drv_file >= 0)
1359 STps->drv_file++;
1360 STps->drv_block = 0;
1361 STps->eof = ST_FM;
1362 }
1363 }
1364
1365 out:
1366 if (STp->rew_at_close) {
1367 result2 = st_int_ioctl(STp, MTREW, 1);
1368 if (result == 0)
1369 result = result2;
1370 }
1371 return result;
1372 }
1373
1374
1375 /* Close the device and release it. BKL is not needed: this is the only thread
1376 accessing this tape. */
1377 static int st_release(struct inode *inode, struct file *filp)
1378 {
1379 int result = 0;
1380 struct scsi_tape *STp = filp->private_data;
1381
1382 if (STp->door_locked == ST_LOCKED_AUTO)
1383 do_door_lock(STp, 0);
1384
1385 normalize_buffer(STp->buffer);
1386 write_lock(&st_dev_arr_lock);
1387 STp->in_use = 0;
1388 write_unlock(&st_dev_arr_lock);
1389 scsi_tape_put(STp);
1390
1391 return result;
1392 }
1393 \f
1394 /* The checks common to both reading and writing */
1395 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1396 {
1397 ssize_t retval = 0;
1398
1399 /*
1400 * If we are in the middle of error recovery, don't let anyone
1401 * else try and use this device. Also, if error recovery fails, it
1402 * may try and take the device offline, in which case all further
1403 * access to the device is prohibited.
1404 */
1405 if (!scsi_block_when_processing_errors(STp->device)) {
1406 retval = (-ENXIO);
1407 goto out;
1408 }
1409
1410 if (STp->ready != ST_READY) {
1411 if (STp->ready == ST_NO_TAPE)
1412 retval = (-ENOMEDIUM);
1413 else
1414 retval = (-EIO);
1415 goto out;
1416 }
1417
1418 if (! STp->modes[STp->current_mode].defined) {
1419 retval = (-ENXIO);
1420 goto out;
1421 }
1422
1423
1424 /*
1425 * If there was a bus reset, block further access
1426 * to this device.
1427 */
1428 if (STp->pos_unknown) {
1429 retval = (-EIO);
1430 goto out;
1431 }
1432
1433 if (count == 0)
1434 goto out;
1435
1436 DEB(
1437 if (!STp->in_use) {
1438 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1439 retval = (-EIO);
1440 goto out;
1441 } ) /* end DEB */
1442
1443 if (STp->can_partitions &&
1444 (retval = switch_partition(STp)) < 0)
1445 goto out;
1446
1447 if (STp->block_size == 0 && STp->max_block > 0 &&
1448 (count < STp->min_block || count > STp->max_block)) {
1449 retval = (-EINVAL);
1450 goto out;
1451 }
1452
1453 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1454 !do_door_lock(STp, 1))
1455 STp->door_locked = ST_LOCKED_AUTO;
1456
1457 out:
1458 return retval;
1459 }
1460
1461
1462 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1463 size_t count, int is_read)
1464 {
1465 int i, bufsize, retval = 0;
1466 struct st_buffer *STbp = STp->buffer;
1467
1468 if (is_read)
1469 i = STp->try_dio_now && try_rdio;
1470 else
1471 i = STp->try_dio_now && try_wdio;
1472
1473 if (i && ((unsigned long)buf & queue_dma_alignment(
1474 STp->device->request_queue)) == 0) {
1475 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1476 count, (is_read ? READ : WRITE));
1477 if (i > 0) {
1478 STbp->do_dio = i;
1479 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1480 }
1481 else
1482 STbp->do_dio = 0; /* fall back to buffering with any error */
1483 STbp->sg_segs = STbp->do_dio;
1484 DEB(
1485 if (STbp->do_dio) {
1486 STp->nbr_dio++;
1487 STp->nbr_pages += STbp->do_dio;
1488 }
1489 )
1490 } else
1491 STbp->do_dio = 0;
1492 DEB( STp->nbr_requests++; )
1493
1494 if (!STbp->do_dio) {
1495 if (STp->block_size)
1496 bufsize = STp->block_size > st_fixed_buffer_size ?
1497 STp->block_size : st_fixed_buffer_size;
1498 else {
1499 bufsize = count;
1500 /* Make sure that data from previous user is not leaked even if
1501 HBA does not return correct residual */
1502 if (is_read && STp->sili && !STbp->cleared)
1503 clear_buffer(STbp);
1504 }
1505
1506 if (bufsize > STbp->buffer_size &&
1507 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1508 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1509 tape_name(STp), bufsize);
1510 retval = (-EOVERFLOW);
1511 goto out;
1512 }
1513 if (STp->block_size)
1514 STbp->buffer_blocks = bufsize / STp->block_size;
1515 }
1516
1517 out:
1518 return retval;
1519 }
1520
1521
1522 /* Can be called more than once after each setup_buffer() */
1523 static void release_buffering(struct scsi_tape *STp, int is_read)
1524 {
1525 struct st_buffer *STbp;
1526
1527 STbp = STp->buffer;
1528 if (STbp->do_dio) {
1529 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1530 STbp->do_dio = 0;
1531 STbp->sg_segs = 0;
1532 }
1533 }
1534
1535
1536 /* Write command */
1537 static ssize_t
1538 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1539 {
1540 ssize_t total;
1541 ssize_t i, do_count, blks, transfer;
1542 ssize_t retval;
1543 int undone, retry_eot = 0, scode;
1544 int async_write;
1545 unsigned char cmd[MAX_COMMAND_SIZE];
1546 const char __user *b_point;
1547 struct st_request *SRpnt = NULL;
1548 struct scsi_tape *STp = filp->private_data;
1549 struct st_modedef *STm;
1550 struct st_partstat *STps;
1551 struct st_buffer *STbp;
1552 char *name = tape_name(STp);
1553
1554 if (mutex_lock_interruptible(&STp->lock))
1555 return -ERESTARTSYS;
1556
1557 retval = rw_checks(STp, filp, count);
1558 if (retval || count == 0)
1559 goto out;
1560
1561 /* Write must be integral number of blocks */
1562 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1563 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1564 name);
1565 retval = (-EINVAL);
1566 goto out;
1567 }
1568
1569 STm = &(STp->modes[STp->current_mode]);
1570 STps = &(STp->ps[STp->partition]);
1571
1572 if (STp->write_prot) {
1573 retval = (-EACCES);
1574 goto out;
1575 }
1576
1577
1578 if (STps->rw == ST_READING) {
1579 retval = flush_buffer(STp, 0);
1580 if (retval)
1581 goto out;
1582 STps->rw = ST_WRITING;
1583 } else if (STps->rw != ST_WRITING &&
1584 STps->drv_file == 0 && STps->drv_block == 0) {
1585 if ((retval = set_mode_densblk(STp, STm)) < 0)
1586 goto out;
1587 if (STm->default_compression != ST_DONT_TOUCH &&
1588 !(STp->compression_changed)) {
1589 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1590 printk(KERN_WARNING "%s: Can't set default compression.\n",
1591 name);
1592 if (modes_defined) {
1593 retval = (-EINVAL);
1594 goto out;
1595 }
1596 }
1597 }
1598 }
1599
1600 STbp = STp->buffer;
1601 i = write_behind_check(STp);
1602 if (i) {
1603 if (i == -ENOSPC)
1604 STps->eof = ST_EOM_OK;
1605 else
1606 STps->eof = ST_EOM_ERROR;
1607 }
1608
1609 if (STps->eof == ST_EOM_OK) {
1610 STps->eof = ST_EOD_1; /* allow next write */
1611 retval = (-ENOSPC);
1612 goto out;
1613 }
1614 else if (STps->eof == ST_EOM_ERROR) {
1615 retval = (-EIO);
1616 goto out;
1617 }
1618
1619 /* Check the buffer readability in cases where copy_user might catch
1620 the problems after some tape movement. */
1621 if (STp->block_size != 0 &&
1622 !STbp->do_dio &&
1623 (copy_from_user(&i, buf, 1) != 0 ||
1624 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1625 retval = (-EFAULT);
1626 goto out;
1627 }
1628
1629 retval = setup_buffering(STp, buf, count, 0);
1630 if (retval)
1631 goto out;
1632
1633 total = count;
1634
1635 memset(cmd, 0, MAX_COMMAND_SIZE);
1636 cmd[0] = WRITE_6;
1637 cmd[1] = (STp->block_size != 0);
1638
1639 STps->rw = ST_WRITING;
1640
1641 b_point = buf;
1642 while (count > 0 && !retry_eot) {
1643
1644 if (STbp->do_dio) {
1645 do_count = count;
1646 }
1647 else {
1648 if (STp->block_size == 0)
1649 do_count = count;
1650 else {
1651 do_count = STbp->buffer_blocks * STp->block_size -
1652 STbp->buffer_bytes;
1653 if (do_count > count)
1654 do_count = count;
1655 }
1656
1657 i = append_to_buffer(b_point, STbp, do_count);
1658 if (i) {
1659 retval = i;
1660 goto out;
1661 }
1662 }
1663 count -= do_count;
1664 b_point += do_count;
1665
1666 async_write = STp->block_size == 0 && !STbp->do_dio &&
1667 STm->do_async_writes && STps->eof < ST_EOM_OK;
1668
1669 if (STp->block_size != 0 && STm->do_buffer_writes &&
1670 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1671 STbp->buffer_bytes < STbp->buffer_size) {
1672 STp->dirty = 1;
1673 /* Don't write a buffer that is not full enough. */
1674 if (!async_write && count == 0)
1675 break;
1676 }
1677
1678 retry_write:
1679 if (STp->block_size == 0)
1680 blks = transfer = do_count;
1681 else {
1682 if (!STbp->do_dio)
1683 blks = STbp->buffer_bytes;
1684 else
1685 blks = do_count;
1686 blks /= STp->block_size;
1687 transfer = blks * STp->block_size;
1688 }
1689 cmd[2] = blks >> 16;
1690 cmd[3] = blks >> 8;
1691 cmd[4] = blks;
1692
1693 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1694 STp->device->request_queue->rq_timeout,
1695 MAX_WRITE_RETRIES, !async_write);
1696 if (!SRpnt) {
1697 retval = STbp->syscall_result;
1698 goto out;
1699 }
1700 if (async_write && !STbp->syscall_result) {
1701 STbp->writing = transfer;
1702 STp->dirty = !(STbp->writing ==
1703 STbp->buffer_bytes);
1704 SRpnt = NULL; /* Prevent releasing this request! */
1705 DEB( STp->write_pending = 1; )
1706 break;
1707 }
1708
1709 if (STbp->syscall_result != 0) {
1710 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1711
1712 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1713 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1714 scode = cmdstatp->sense_hdr.sense_key;
1715 if (cmdstatp->remainder_valid)
1716 undone = (int)cmdstatp->uremainder64;
1717 else if (STp->block_size == 0 &&
1718 scode == VOLUME_OVERFLOW)
1719 undone = transfer;
1720 else
1721 undone = 0;
1722 if (STp->block_size != 0)
1723 undone *= STp->block_size;
1724 if (undone <= do_count) {
1725 /* Only data from this write is not written */
1726 count += undone;
1727 b_point -= undone;
1728 do_count -= undone;
1729 if (STp->block_size)
1730 blks = (transfer - undone) / STp->block_size;
1731 STps->eof = ST_EOM_OK;
1732 /* Continue in fixed block mode if all written
1733 in this request but still something left to write
1734 (retval left to zero)
1735 */
1736 if (STp->block_size == 0 ||
1737 undone > 0 || count == 0)
1738 retval = (-ENOSPC); /* EOM within current request */
1739 DEBC(printk(ST_DEB_MSG
1740 "%s: EOM with %d bytes unwritten.\n",
1741 name, (int)count));
1742 } else {
1743 /* EOT within data buffered earlier (possible only
1744 in fixed block mode without direct i/o) */
1745 if (!retry_eot && !cmdstatp->deferred &&
1746 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1747 move_buffer_data(STp->buffer, transfer - undone);
1748 retry_eot = 1;
1749 if (STps->drv_block >= 0) {
1750 STps->drv_block += (transfer - undone) /
1751 STp->block_size;
1752 }
1753 STps->eof = ST_EOM_OK;
1754 DEBC(printk(ST_DEB_MSG
1755 "%s: Retry write of %d bytes at EOM.\n",
1756 name, STp->buffer->buffer_bytes));
1757 goto retry_write;
1758 }
1759 else {
1760 /* Either error within data buffered by driver or
1761 failed retry */
1762 count -= do_count;
1763 blks = do_count = 0;
1764 STps->eof = ST_EOM_ERROR;
1765 STps->drv_block = (-1); /* Too cautious? */
1766 retval = (-EIO); /* EOM for old data */
1767 DEBC(printk(ST_DEB_MSG
1768 "%s: EOM with lost data.\n",
1769 name));
1770 }
1771 }
1772 } else {
1773 count += do_count;
1774 STps->drv_block = (-1); /* Too cautious? */
1775 retval = STbp->syscall_result;
1776 }
1777
1778 }
1779
1780 if (STps->drv_block >= 0) {
1781 if (STp->block_size == 0)
1782 STps->drv_block += (do_count > 0);
1783 else
1784 STps->drv_block += blks;
1785 }
1786
1787 STbp->buffer_bytes = 0;
1788 STp->dirty = 0;
1789
1790 if (retval || retry_eot) {
1791 if (count < total)
1792 retval = total - count;
1793 goto out;
1794 }
1795 }
1796
1797 if (STps->eof == ST_EOD_1)
1798 STps->eof = ST_EOM_OK;
1799 else if (STps->eof != ST_EOM_OK)
1800 STps->eof = ST_NOEOF;
1801 retval = total - count;
1802
1803 out:
1804 if (SRpnt != NULL)
1805 st_release_request(SRpnt);
1806 release_buffering(STp, 0);
1807 mutex_unlock(&STp->lock);
1808
1809 return retval;
1810 }
1811 \f
1812 /* Read data from the tape. Returns zero in the normal case, one if the
1813 eof status has changed, and the negative error code in case of a
1814 fatal error. Otherwise updates the buffer and the eof state.
1815
1816 Does release user buffer mapping if it is set.
1817 */
1818 static long read_tape(struct scsi_tape *STp, long count,
1819 struct st_request ** aSRpnt)
1820 {
1821 int transfer, blks, bytes;
1822 unsigned char cmd[MAX_COMMAND_SIZE];
1823 struct st_request *SRpnt;
1824 struct st_modedef *STm;
1825 struct st_partstat *STps;
1826 struct st_buffer *STbp;
1827 int retval = 0;
1828 char *name = tape_name(STp);
1829
1830 if (count == 0)
1831 return 0;
1832
1833 STm = &(STp->modes[STp->current_mode]);
1834 STps = &(STp->ps[STp->partition]);
1835 if (STps->eof == ST_FM_HIT)
1836 return 1;
1837 STbp = STp->buffer;
1838
1839 if (STp->block_size == 0)
1840 blks = bytes = count;
1841 else {
1842 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1843 blks = (STp->buffer)->buffer_blocks;
1844 bytes = blks * STp->block_size;
1845 } else {
1846 bytes = count;
1847 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1848 bytes = (STp->buffer)->buffer_size;
1849 blks = bytes / STp->block_size;
1850 bytes = blks * STp->block_size;
1851 }
1852 }
1853
1854 memset(cmd, 0, MAX_COMMAND_SIZE);
1855 cmd[0] = READ_6;
1856 cmd[1] = (STp->block_size != 0);
1857 if (!cmd[1] && STp->sili)
1858 cmd[1] |= 2;
1859 cmd[2] = blks >> 16;
1860 cmd[3] = blks >> 8;
1861 cmd[4] = blks;
1862
1863 SRpnt = *aSRpnt;
1864 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1865 STp->device->request_queue->rq_timeout,
1866 MAX_RETRIES, 1);
1867 release_buffering(STp, 1);
1868 *aSRpnt = SRpnt;
1869 if (!SRpnt)
1870 return STbp->syscall_result;
1871
1872 STbp->read_pointer = 0;
1873 STps->at_sm = 0;
1874
1875 /* Something to check */
1876 if (STbp->syscall_result) {
1877 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1878
1879 retval = 1;
1880 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1881 name,
1882 SRpnt->sense[0], SRpnt->sense[1],
1883 SRpnt->sense[2], SRpnt->sense[3],
1884 SRpnt->sense[4], SRpnt->sense[5],
1885 SRpnt->sense[6], SRpnt->sense[7]));
1886 if (cmdstatp->have_sense) {
1887
1888 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1889 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1890
1891 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1892 /* Compute the residual count */
1893 if (cmdstatp->remainder_valid)
1894 transfer = (int)cmdstatp->uremainder64;
1895 else
1896 transfer = 0;
1897 if (STp->block_size == 0 &&
1898 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1899 transfer = bytes;
1900
1901 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1902 if (STp->block_size == 0) {
1903 if (transfer <= 0) {
1904 if (transfer < 0)
1905 printk(KERN_NOTICE
1906 "%s: Failed to read %d byte block with %d byte transfer.\n",
1907 name, bytes - transfer, bytes);
1908 if (STps->drv_block >= 0)
1909 STps->drv_block += 1;
1910 STbp->buffer_bytes = 0;
1911 return (-ENOMEM);
1912 }
1913 STbp->buffer_bytes = bytes - transfer;
1914 } else {
1915 st_release_request(SRpnt);
1916 SRpnt = *aSRpnt = NULL;
1917 if (transfer == blks) { /* We did not get anything, error */
1918 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1919 if (STps->drv_block >= 0)
1920 STps->drv_block += blks - transfer + 1;
1921 st_int_ioctl(STp, MTBSR, 1);
1922 return (-EIO);
1923 }
1924 /* We have some data, deliver it */
1925 STbp->buffer_bytes = (blks - transfer) *
1926 STp->block_size;
1927 DEBC(printk(ST_DEB_MSG
1928 "%s: ILI but enough data received %ld %d.\n",
1929 name, count, STbp->buffer_bytes));
1930 if (STps->drv_block >= 0)
1931 STps->drv_block += 1;
1932 if (st_int_ioctl(STp, MTBSR, 1))
1933 return (-EIO);
1934 }
1935 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1936 if (STps->eof != ST_FM_HIT)
1937 STps->eof = ST_FM_HIT;
1938 else
1939 STps->eof = ST_EOD_2;
1940 if (STp->block_size == 0)
1941 STbp->buffer_bytes = 0;
1942 else
1943 STbp->buffer_bytes =
1944 bytes - transfer * STp->block_size;
1945 DEBC(printk(ST_DEB_MSG
1946 "%s: EOF detected (%d bytes read).\n",
1947 name, STbp->buffer_bytes));
1948 } else if (cmdstatp->flags & SENSE_EOM) {
1949 if (STps->eof == ST_FM)
1950 STps->eof = ST_EOD_1;
1951 else
1952 STps->eof = ST_EOM_OK;
1953 if (STp->block_size == 0)
1954 STbp->buffer_bytes = bytes - transfer;
1955 else
1956 STbp->buffer_bytes =
1957 bytes - transfer * STp->block_size;
1958
1959 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1960 name, STbp->buffer_bytes));
1961 }
1962 }
1963 /* end of EOF, EOM, ILI test */
1964 else { /* nonzero sense key */
1965 DEBC(printk(ST_DEB_MSG
1966 "%s: Tape error while reading.\n", name));
1967 STps->drv_block = (-1);
1968 if (STps->eof == ST_FM &&
1969 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1970 DEBC(printk(ST_DEB_MSG
1971 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1972 name));
1973 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1974 } else /* Some other extended sense code */
1975 retval = (-EIO);
1976 }
1977
1978 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1979 STbp->buffer_bytes = 0;
1980 }
1981 /* End of extended sense test */
1982 else { /* Non-extended sense */
1983 retval = STbp->syscall_result;
1984 }
1985
1986 }
1987 /* End of error handling */
1988 else { /* Read successful */
1989 STbp->buffer_bytes = bytes;
1990 if (STp->sili) /* In fixed block mode residual is always zero here */
1991 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
1992 }
1993
1994 if (STps->drv_block >= 0) {
1995 if (STp->block_size == 0)
1996 STps->drv_block++;
1997 else
1998 STps->drv_block += STbp->buffer_bytes / STp->block_size;
1999 }
2000 return retval;
2001 }
2002 \f
2003
2004 /* Read command */
2005 static ssize_t
2006 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2007 {
2008 ssize_t total;
2009 ssize_t retval = 0;
2010 ssize_t i, transfer;
2011 int special, do_dio = 0;
2012 struct st_request *SRpnt = NULL;
2013 struct scsi_tape *STp = filp->private_data;
2014 struct st_modedef *STm;
2015 struct st_partstat *STps;
2016 struct st_buffer *STbp = STp->buffer;
2017 DEB( char *name = tape_name(STp); )
2018
2019 if (mutex_lock_interruptible(&STp->lock))
2020 return -ERESTARTSYS;
2021
2022 retval = rw_checks(STp, filp, count);
2023 if (retval || count == 0)
2024 goto out;
2025
2026 STm = &(STp->modes[STp->current_mode]);
2027 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2028 if (!STm->do_read_ahead) {
2029 retval = (-EINVAL); /* Read must be integral number of blocks */
2030 goto out;
2031 }
2032 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2033 }
2034
2035 STps = &(STp->ps[STp->partition]);
2036 if (STps->rw == ST_WRITING) {
2037 retval = flush_buffer(STp, 0);
2038 if (retval)
2039 goto out;
2040 STps->rw = ST_READING;
2041 }
2042 DEB(
2043 if (debugging && STps->eof != ST_NOEOF)
2044 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2045 STps->eof, STbp->buffer_bytes);
2046 ) /* end DEB */
2047
2048 retval = setup_buffering(STp, buf, count, 1);
2049 if (retval)
2050 goto out;
2051 do_dio = STbp->do_dio;
2052
2053 if (STbp->buffer_bytes == 0 &&
2054 STps->eof >= ST_EOD_1) {
2055 if (STps->eof < ST_EOD) {
2056 STps->eof += 1;
2057 retval = 0;
2058 goto out;
2059 }
2060 retval = (-EIO); /* EOM or Blank Check */
2061 goto out;
2062 }
2063
2064 if (do_dio) {
2065 /* Check the buffer writability before any tape movement. Don't alter
2066 buffer data. */
2067 if (copy_from_user(&i, buf, 1) != 0 ||
2068 copy_to_user(buf, &i, 1) != 0 ||
2069 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2070 copy_to_user(buf + count - 1, &i, 1) != 0) {
2071 retval = (-EFAULT);
2072 goto out;
2073 }
2074 }
2075
2076 STps->rw = ST_READING;
2077
2078
2079 /* Loop until enough data in buffer or a special condition found */
2080 for (total = 0, special = 0; total < count && !special;) {
2081
2082 /* Get new data if the buffer is empty */
2083 if (STbp->buffer_bytes == 0) {
2084 special = read_tape(STp, count - total, &SRpnt);
2085 if (special < 0) { /* No need to continue read */
2086 retval = special;
2087 goto out;
2088 }
2089 }
2090
2091 /* Move the data from driver buffer to user buffer */
2092 if (STbp->buffer_bytes > 0) {
2093 DEB(
2094 if (debugging && STps->eof != ST_NOEOF)
2095 printk(ST_DEB_MSG
2096 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2097 STps->eof, STbp->buffer_bytes,
2098 (int)(count - total));
2099 ) /* end DEB */
2100 transfer = STbp->buffer_bytes < count - total ?
2101 STbp->buffer_bytes : count - total;
2102 if (!do_dio) {
2103 i = from_buffer(STbp, buf, transfer);
2104 if (i) {
2105 retval = i;
2106 goto out;
2107 }
2108 }
2109 buf += transfer;
2110 total += transfer;
2111 }
2112
2113 if (STp->block_size == 0)
2114 break; /* Read only one variable length block */
2115
2116 } /* for (total = 0, special = 0;
2117 total < count && !special; ) */
2118
2119 /* Change the eof state if no data from tape or buffer */
2120 if (total == 0) {
2121 if (STps->eof == ST_FM_HIT) {
2122 STps->eof = ST_FM;
2123 STps->drv_block = 0;
2124 if (STps->drv_file >= 0)
2125 STps->drv_file++;
2126 } else if (STps->eof == ST_EOD_1) {
2127 STps->eof = ST_EOD_2;
2128 STps->drv_block = 0;
2129 if (STps->drv_file >= 0)
2130 STps->drv_file++;
2131 } else if (STps->eof == ST_EOD_2)
2132 STps->eof = ST_EOD;
2133 } else if (STps->eof == ST_FM)
2134 STps->eof = ST_NOEOF;
2135 retval = total;
2136
2137 out:
2138 if (SRpnt != NULL) {
2139 st_release_request(SRpnt);
2140 SRpnt = NULL;
2141 }
2142 if (do_dio) {
2143 release_buffering(STp, 1);
2144 STbp->buffer_bytes = 0;
2145 }
2146 mutex_unlock(&STp->lock);
2147
2148 return retval;
2149 }
2150 \f
2151
2152
2153 DEB(
2154 /* Set the driver options */
2155 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2156 {
2157 if (debugging) {
2158 printk(KERN_INFO
2159 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2160 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2161 STm->do_read_ahead);
2162 printk(KERN_INFO
2163 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2164 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2165 printk(KERN_INFO
2166 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2167 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2168 STp->scsi2_logical);
2169 printk(KERN_INFO
2170 "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate,
2171 STp->sili);
2172 printk(KERN_INFO "%s: debugging: %d\n",
2173 name, debugging);
2174 }
2175 }
2176 )
2177
2178
2179 static int st_set_options(struct scsi_tape *STp, long options)
2180 {
2181 int value;
2182 long code;
2183 struct st_modedef *STm;
2184 char *name = tape_name(STp);
2185 struct cdev *cd0, *cd1;
2186
2187 STm = &(STp->modes[STp->current_mode]);
2188 if (!STm->defined) {
2189 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2190 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2191 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
2192 modes_defined = 1;
2193 DEBC(printk(ST_DEB_MSG
2194 "%s: Initialized mode %d definition from mode 0\n",
2195 name, STp->current_mode));
2196 }
2197
2198 code = options & MT_ST_OPTIONS;
2199 if (code == MT_ST_BOOLEANS) {
2200 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2201 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2202 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2203 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2204 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2205 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2206 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2207 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2208 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2209 if ((STp->device)->scsi_level >= SCSI_2)
2210 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2211 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2212 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2213 STm->sysv = (options & MT_ST_SYSV) != 0;
2214 STp->sili = (options & MT_ST_SILI) != 0;
2215 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2216 st_log_options(STp, STm, name); )
2217 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2218 value = (code == MT_ST_SETBOOLEANS);
2219 if ((options & MT_ST_BUFFER_WRITES) != 0)
2220 STm->do_buffer_writes = value;
2221 if ((options & MT_ST_ASYNC_WRITES) != 0)
2222 STm->do_async_writes = value;
2223 if ((options & MT_ST_DEF_WRITES) != 0)
2224 STm->defaults_for_writes = value;
2225 if ((options & MT_ST_READ_AHEAD) != 0)
2226 STm->do_read_ahead = value;
2227 if ((options & MT_ST_TWO_FM) != 0)
2228 STp->two_fm = value;
2229 if ((options & MT_ST_FAST_MTEOM) != 0)
2230 STp->fast_mteom = value;
2231 if ((options & MT_ST_AUTO_LOCK) != 0)
2232 STp->do_auto_lock = value;
2233 if ((options & MT_ST_CAN_BSR) != 0)
2234 STp->can_bsr = value;
2235 if ((options & MT_ST_NO_BLKLIMS) != 0)
2236 STp->omit_blklims = value;
2237 if ((STp->device)->scsi_level >= SCSI_2 &&
2238 (options & MT_ST_CAN_PARTITIONS) != 0)
2239 STp->can_partitions = value;
2240 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2241 STp->scsi2_logical = value;
2242 if ((options & MT_ST_NOWAIT) != 0)
2243 STp->immediate = value;
2244 if ((options & MT_ST_SYSV) != 0)
2245 STm->sysv = value;
2246 if ((options & MT_ST_SILI) != 0)
2247 STp->sili = value;
2248 DEB(
2249 if ((options & MT_ST_DEBUGGING) != 0)
2250 debugging = value;
2251 st_log_options(STp, STm, name); )
2252 } else if (code == MT_ST_WRITE_THRESHOLD) {
2253 /* Retained for compatibility */
2254 } else if (code == MT_ST_DEF_BLKSIZE) {
2255 value = (options & ~MT_ST_OPTIONS);
2256 if (value == ~MT_ST_OPTIONS) {
2257 STm->default_blksize = (-1);
2258 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2259 } else {
2260 STm->default_blksize = value;
2261 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2262 name, STm->default_blksize));
2263 if (STp->ready == ST_READY) {
2264 STp->blksize_changed = 0;
2265 set_mode_densblk(STp, STm);
2266 }
2267 }
2268 } else if (code == MT_ST_TIMEOUTS) {
2269 value = (options & ~MT_ST_OPTIONS);
2270 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2271 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2272 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2273 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2274 } else {
2275 blk_queue_rq_timeout(STp->device->request_queue,
2276 value * HZ);
2277 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2278 name, value) );
2279 }
2280 } else if (code == MT_ST_SET_CLN) {
2281 value = (options & ~MT_ST_OPTIONS) & 0xff;
2282 if (value != 0 &&
2283 value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
2284 return (-EINVAL);
2285 STp->cln_mode = value;
2286 STp->cln_sense_mask = (options >> 8) & 0xff;
2287 STp->cln_sense_value = (options >> 16) & 0xff;
2288 printk(KERN_INFO
2289 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2290 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2291 } else if (code == MT_ST_DEF_OPTIONS) {
2292 code = (options & ~MT_ST_CLEAR_DEFAULT);
2293 value = (options & MT_ST_CLEAR_DEFAULT);
2294 if (code == MT_ST_DEF_DENSITY) {
2295 if (value == MT_ST_CLEAR_DEFAULT) {
2296 STm->default_density = (-1);
2297 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2298 name));
2299 } else {
2300 STm->default_density = value & 0xff;
2301 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2302 name, STm->default_density));
2303 if (STp->ready == ST_READY) {
2304 STp->density_changed = 0;
2305 set_mode_densblk(STp, STm);
2306 }
2307 }
2308 } else if (code == MT_ST_DEF_DRVBUFFER) {
2309 if (value == MT_ST_CLEAR_DEFAULT) {
2310 STp->default_drvbuffer = 0xff;
2311 DEBC( printk(KERN_INFO
2312 "%s: Drive buffer default disabled.\n", name));
2313 } else {
2314 STp->default_drvbuffer = value & 7;
2315 DEBC( printk(KERN_INFO
2316 "%s: Drive buffer default set to %x\n",
2317 name, STp->default_drvbuffer));
2318 if (STp->ready == ST_READY)
2319 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2320 }
2321 } else if (code == MT_ST_DEF_COMPRESSION) {
2322 if (value == MT_ST_CLEAR_DEFAULT) {
2323 STm->default_compression = ST_DONT_TOUCH;
2324 DEBC( printk(KERN_INFO
2325 "%s: Compression default disabled.\n", name));
2326 } else {
2327 if ((value & 0xff00) != 0) {
2328 STp->c_algo = (value & 0xff00) >> 8;
2329 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2330 name, STp->c_algo));
2331 }
2332 if ((value & 0xff) != 0xff) {
2333 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2334 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2335 name, (value & 1)));
2336 if (STp->ready == ST_READY) {
2337 STp->compression_changed = 0;
2338 st_compression(STp, (STm->default_compression == ST_YES));
2339 }
2340 }
2341 }
2342 }
2343 } else
2344 return (-EIO);
2345
2346 return 0;
2347 }
2348 \f
2349 #define MODE_HEADER_LENGTH 4
2350
2351 /* Mode header and page byte offsets */
2352 #define MH_OFF_DATA_LENGTH 0
2353 #define MH_OFF_MEDIUM_TYPE 1
2354 #define MH_OFF_DEV_SPECIFIC 2
2355 #define MH_OFF_BDESCS_LENGTH 3
2356 #define MP_OFF_PAGE_NBR 0
2357 #define MP_OFF_PAGE_LENGTH 1
2358
2359 /* Mode header and page bit masks */
2360 #define MH_BIT_WP 0x80
2361 #define MP_MSK_PAGE_NBR 0x3f
2362
2363 /* Don't return block descriptors */
2364 #define MODE_SENSE_OMIT_BDESCS 0x08
2365
2366 #define MODE_SELECT_PAGE_FORMAT 0x10
2367
2368 /* Read a mode page into the tape buffer. The block descriptors are included
2369 if incl_block_descs is true. The page control is ored to the page number
2370 parameter, if necessary. */
2371 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2372 {
2373 unsigned char cmd[MAX_COMMAND_SIZE];
2374 struct st_request *SRpnt;
2375
2376 memset(cmd, 0, MAX_COMMAND_SIZE);
2377 cmd[0] = MODE_SENSE;
2378 if (omit_block_descs)
2379 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2380 cmd[2] = page;
2381 cmd[4] = 255;
2382
2383 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2384 STp->device->request_queue->rq_timeout, 0, 1);
2385 if (SRpnt == NULL)
2386 return (STp->buffer)->syscall_result;
2387
2388 st_release_request(SRpnt);
2389
2390 return STp->buffer->syscall_result;
2391 }
2392
2393
2394 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2395 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2396 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2397 {
2398 int pgo;
2399 unsigned char cmd[MAX_COMMAND_SIZE];
2400 struct st_request *SRpnt;
2401 int timeout;
2402
2403 memset(cmd, 0, MAX_COMMAND_SIZE);
2404 cmd[0] = MODE_SELECT;
2405 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2406 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2407 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2408
2409 /* Clear reserved fields */
2410 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2411 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2412 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2413 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2414
2415 timeout = slow ?
2416 STp->long_timeout : STp->device->request_queue->rq_timeout;
2417 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2418 timeout, 0, 1);
2419 if (SRpnt == NULL)
2420 return (STp->buffer)->syscall_result;
2421
2422 st_release_request(SRpnt);
2423
2424 return STp->buffer->syscall_result;
2425 }
2426
2427
2428 #define COMPRESSION_PAGE 0x0f
2429 #define COMPRESSION_PAGE_LENGTH 16
2430
2431 #define CP_OFF_DCE_DCC 2
2432 #define CP_OFF_C_ALGO 7
2433
2434 #define DCE_MASK 0x80
2435 #define DCC_MASK 0x40
2436 #define RED_MASK 0x60
2437
2438
2439 /* Control the compression with mode page 15. Algorithm not changed if zero.
2440
2441 The block descriptors are read and written because Sony SDT-7000 does not
2442 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2443 Including block descriptors should not cause any harm to other drives. */
2444
2445 static int st_compression(struct scsi_tape * STp, int state)
2446 {
2447 int retval;
2448 int mpoffs; /* Offset to mode page start */
2449 unsigned char *b_data = (STp->buffer)->b_data;
2450 DEB( char *name = tape_name(STp); )
2451
2452 if (STp->ready != ST_READY)
2453 return (-EIO);
2454
2455 /* Read the current page contents */
2456 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2457 if (retval) {
2458 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2459 name));
2460 return (-EIO);
2461 }
2462
2463 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2464 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2465 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2466
2467 /* Check if compression can be changed */
2468 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2469 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2470 return (-EIO);
2471 }
2472
2473 /* Do the change */
2474 if (state) {
2475 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2476 if (STp->c_algo != 0)
2477 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2478 }
2479 else {
2480 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2481 if (STp->c_algo != 0)
2482 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2483 }
2484
2485 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2486 if (retval) {
2487 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2488 return (-EIO);
2489 }
2490 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2491 name, state));
2492
2493 STp->compression_changed = 1;
2494 return 0;
2495 }
2496
2497
2498 /* Process the load and unload commands (does unload if the load code is zero) */
2499 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2500 {
2501 int retval = (-EIO), timeout;
2502 DEB( char *name = tape_name(STp); )
2503 unsigned char cmd[MAX_COMMAND_SIZE];
2504 struct st_partstat *STps;
2505 struct st_request *SRpnt;
2506
2507 if (STp->ready != ST_READY && !load_code) {
2508 if (STp->ready == ST_NO_TAPE)
2509 return (-ENOMEDIUM);
2510 else
2511 return (-EIO);
2512 }
2513
2514 memset(cmd, 0, MAX_COMMAND_SIZE);
2515 cmd[0] = START_STOP;
2516 if (load_code)
2517 cmd[4] |= 1;
2518 /*
2519 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2520 */
2521 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2522 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2523 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2524 name, (cmd[4]) ? "" : "un",
2525 load_code - MT_ST_HPLOADER_OFFSET));
2526 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2527 }
2528 if (STp->immediate) {
2529 cmd[1] = 1; /* Don't wait for completion */
2530 timeout = STp->device->request_queue->rq_timeout;
2531 }
2532 else
2533 timeout = STp->long_timeout;
2534
2535 DEBC(
2536 if (!load_code)
2537 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2538 else
2539 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2540 );
2541
2542 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2543 timeout, MAX_RETRIES, 1);
2544 if (!SRpnt)
2545 return (STp->buffer)->syscall_result;
2546
2547 retval = (STp->buffer)->syscall_result;
2548 st_release_request(SRpnt);
2549
2550 if (!retval) { /* SCSI command successful */
2551
2552 if (!load_code) {
2553 STp->rew_at_close = 0;
2554 STp->ready = ST_NO_TAPE;
2555 }
2556 else {
2557 STp->rew_at_close = STp->autorew_dev;
2558 retval = check_tape(STp, filp);
2559 if (retval > 0)
2560 retval = 0;
2561 }
2562 }
2563 else {
2564 STps = &(STp->ps[STp->partition]);
2565 STps->drv_file = STps->drv_block = (-1);
2566 }
2567
2568 return retval;
2569 }
2570 \f
2571 #if DEBUG
2572 #define ST_DEB_FORWARD 0
2573 #define ST_DEB_BACKWARD 1
2574 static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2575 {
2576 s32 sc;
2577
2578 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2579 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2580 if (direction)
2581 sc = -sc;
2582 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2583 direction ? "backward" : "forward", sc, units);
2584 }
2585 #endif
2586
2587
2588 /* Internal ioctl function */
2589 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2590 {
2591 int timeout;
2592 long ltmp;
2593 int ioctl_result;
2594 int chg_eof = 1;
2595 unsigned char cmd[MAX_COMMAND_SIZE];
2596 struct st_request *SRpnt;
2597 struct st_partstat *STps;
2598 int fileno, blkno, at_sm, undone;
2599 int datalen = 0, direction = DMA_NONE;
2600 char *name = tape_name(STp);
2601
2602 WARN_ON(STp->buffer->do_dio != 0);
2603 if (STp->ready != ST_READY) {
2604 if (STp->ready == ST_NO_TAPE)
2605 return (-ENOMEDIUM);
2606 else
2607 return (-EIO);
2608 }
2609 timeout = STp->long_timeout;
2610 STps = &(STp->ps[STp->partition]);
2611 fileno = STps->drv_file;
2612 blkno = STps->drv_block;
2613 at_sm = STps->at_sm;
2614
2615 memset(cmd, 0, MAX_COMMAND_SIZE);
2616 switch (cmd_in) {
2617 case MTFSFM:
2618 chg_eof = 0; /* Changed from the FSF after this */
2619 case MTFSF:
2620 cmd[0] = SPACE;
2621 cmd[1] = 0x01; /* Space FileMarks */
2622 cmd[2] = (arg >> 16);
2623 cmd[3] = (arg >> 8);
2624 cmd[4] = arg;
2625 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2626 if (fileno >= 0)
2627 fileno += arg;
2628 blkno = 0;
2629 at_sm &= (arg == 0);
2630 break;
2631 case MTBSFM:
2632 chg_eof = 0; /* Changed from the FSF after this */
2633 case MTBSF:
2634 cmd[0] = SPACE;
2635 cmd[1] = 0x01; /* Space FileMarks */
2636 ltmp = (-arg);
2637 cmd[2] = (ltmp >> 16);
2638 cmd[3] = (ltmp >> 8);
2639 cmd[4] = ltmp;
2640 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2641 if (fileno >= 0)
2642 fileno -= arg;
2643 blkno = (-1); /* We can't know the block number */
2644 at_sm &= (arg == 0);
2645 break;
2646 case MTFSR:
2647 cmd[0] = SPACE;
2648 cmd[1] = 0x00; /* Space Blocks */
2649 cmd[2] = (arg >> 16);
2650 cmd[3] = (arg >> 8);
2651 cmd[4] = arg;
2652 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2653 if (blkno >= 0)
2654 blkno += arg;
2655 at_sm &= (arg == 0);
2656 break;
2657 case MTBSR:
2658 cmd[0] = SPACE;
2659 cmd[1] = 0x00; /* Space Blocks */
2660 ltmp = (-arg);
2661 cmd[2] = (ltmp >> 16);
2662 cmd[3] = (ltmp >> 8);
2663 cmd[4] = ltmp;
2664 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
2665 if (blkno >= 0)
2666 blkno -= arg;
2667 at_sm &= (arg == 0);
2668 break;
2669 case MTFSS:
2670 cmd[0] = SPACE;
2671 cmd[1] = 0x04; /* Space Setmarks */
2672 cmd[2] = (arg >> 16);
2673 cmd[3] = (arg >> 8);
2674 cmd[4] = arg;
2675 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2676 if (arg != 0) {
2677 blkno = fileno = (-1);
2678 at_sm = 1;
2679 }
2680 break;
2681 case MTBSS:
2682 cmd[0] = SPACE;
2683 cmd[1] = 0x04; /* Space Setmarks */
2684 ltmp = (-arg);
2685 cmd[2] = (ltmp >> 16);
2686 cmd[3] = (ltmp >> 8);
2687 cmd[4] = ltmp;
2688 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
2689 if (arg != 0) {
2690 blkno = fileno = (-1);
2691 at_sm = 1;
2692 }
2693 break;
2694 case MTWEOF:
2695 case MTWSM:
2696 if (STp->write_prot)
2697 return (-EACCES);
2698 cmd[0] = WRITE_FILEMARKS;
2699 if (cmd_in == MTWSM)
2700 cmd[1] = 2;
2701 cmd[2] = (arg >> 16);
2702 cmd[3] = (arg >> 8);
2703 cmd[4] = arg;
2704 timeout = STp->device->request_queue->rq_timeout;
2705 DEBC(
2706 if (cmd_in == MTWEOF)
2707 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2708 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2709 else
2710 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2711 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2712 )
2713 if (fileno >= 0)
2714 fileno += arg;
2715 blkno = 0;
2716 at_sm = (cmd_in == MTWSM);
2717 break;
2718 case MTREW:
2719 cmd[0] = REZERO_UNIT;
2720 if (STp->immediate) {
2721 cmd[1] = 1; /* Don't wait for completion */
2722 timeout = STp->device->request_queue->rq_timeout;
2723 }
2724 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2725 fileno = blkno = at_sm = 0;
2726 break;
2727 case MTNOP:
2728 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2729 return 0; /* Should do something ? */
2730 break;
2731 case MTRETEN:
2732 cmd[0] = START_STOP;
2733 if (STp->immediate) {
2734 cmd[1] = 1; /* Don't wait for completion */
2735 timeout = STp->device->request_queue->rq_timeout;
2736 }
2737 cmd[4] = 3;
2738 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2739 fileno = blkno = at_sm = 0;
2740 break;
2741 case MTEOM:
2742 if (!STp->fast_mteom) {
2743 /* space to the end of tape */
2744 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2745 fileno = STps->drv_file;
2746 if (STps->eof >= ST_EOD_1)
2747 return 0;
2748 /* The next lines would hide the number of spaced FileMarks
2749 That's why I inserted the previous lines. I had no luck
2750 with detecting EOM with FSF, so we go now to EOM.
2751 Joerg Weule */
2752 } else
2753 fileno = (-1);
2754 cmd[0] = SPACE;
2755 cmd[1] = 3;
2756 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2757 name));
2758 blkno = -1;
2759 at_sm = 0;
2760 break;
2761 case MTERASE:
2762 if (STp->write_prot)
2763 return (-EACCES);
2764 cmd[0] = ERASE;
2765 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2766 if (STp->immediate) {
2767 cmd[1] |= 2; /* Don't wait for completion */
2768 timeout = STp->device->request_queue->rq_timeout;
2769 }
2770 else
2771 timeout = STp->long_timeout * 8;
2772
2773 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2774 fileno = blkno = at_sm = 0;
2775 break;
2776 case MTSETBLK: /* Set block length */
2777 case MTSETDENSITY: /* Set tape density */
2778 case MTSETDRVBUFFER: /* Set drive buffering */
2779 case SET_DENS_AND_BLK: /* Set density and block size */
2780 chg_eof = 0;
2781 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2782 return (-EIO); /* Not allowed if data in buffer */
2783 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2784 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2785 STp->max_block > 0 &&
2786 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2787 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2788 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2789 return (-EINVAL);
2790 }
2791 cmd[0] = MODE_SELECT;
2792 if ((STp->use_pf & USE_PF))
2793 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2794 cmd[4] = datalen = 12;
2795 direction = DMA_TO_DEVICE;
2796
2797 memset((STp->buffer)->b_data, 0, 12);
2798 if (cmd_in == MTSETDRVBUFFER)
2799 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2800 else
2801 (STp->buffer)->b_data[2] =
2802 STp->drv_buffer << 4;
2803 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2804 if (cmd_in == MTSETDENSITY) {
2805 (STp->buffer)->b_data[4] = arg;
2806 STp->density_changed = 1; /* At least we tried ;-) */
2807 } else if (cmd_in == SET_DENS_AND_BLK)
2808 (STp->buffer)->b_data[4] = arg >> 24;
2809 else
2810 (STp->buffer)->b_data[4] = STp->density;
2811 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2812 ltmp = arg & MT_ST_BLKSIZE_MASK;
2813 if (cmd_in == MTSETBLK)
2814 STp->blksize_changed = 1; /* At least we tried ;-) */
2815 } else
2816 ltmp = STp->block_size;
2817 (STp->buffer)->b_data[9] = (ltmp >> 16);
2818 (STp->buffer)->b_data[10] = (ltmp >> 8);
2819 (STp->buffer)->b_data[11] = ltmp;
2820 timeout = STp->device->request_queue->rq_timeout;
2821 DEBC(
2822 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2823 printk(ST_DEB_MSG
2824 "%s: Setting block size to %d bytes.\n", name,
2825 (STp->buffer)->b_data[9] * 65536 +
2826 (STp->buffer)->b_data[10] * 256 +
2827 (STp->buffer)->b_data[11]);
2828 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2829 printk(ST_DEB_MSG
2830 "%s: Setting density code to %x.\n", name,
2831 (STp->buffer)->b_data[4]);
2832 if (cmd_in == MTSETDRVBUFFER)
2833 printk(ST_DEB_MSG
2834 "%s: Setting drive buffer code to %d.\n", name,
2835 ((STp->buffer)->b_data[2] >> 4) & 7);
2836 )
2837 break;
2838 default:
2839 return (-ENOSYS);
2840 }
2841
2842 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2843 timeout, MAX_RETRIES, 1);
2844 if (!SRpnt)
2845 return (STp->buffer)->syscall_result;
2846
2847 ioctl_result = (STp->buffer)->syscall_result;
2848
2849 if (!ioctl_result) { /* SCSI command successful */
2850 st_release_request(SRpnt);
2851 SRpnt = NULL;
2852 STps->drv_block = blkno;
2853 STps->drv_file = fileno;
2854 STps->at_sm = at_sm;
2855
2856 if (cmd_in == MTBSFM)
2857 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2858 else if (cmd_in == MTFSFM)
2859 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2860
2861 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2862 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2863 if (STp->block_size != 0) {
2864 (STp->buffer)->buffer_blocks =
2865 (STp->buffer)->buffer_size / STp->block_size;
2866 }
2867 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2868 if (cmd_in == SET_DENS_AND_BLK)
2869 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2870 } else if (cmd_in == MTSETDRVBUFFER)
2871 STp->drv_buffer = (arg & 7);
2872 else if (cmd_in == MTSETDENSITY)
2873 STp->density = arg;
2874
2875 if (cmd_in == MTEOM)
2876 STps->eof = ST_EOD;
2877 else if (cmd_in == MTFSF)
2878 STps->eof = ST_FM;
2879 else if (chg_eof)
2880 STps->eof = ST_NOEOF;
2881
2882 if (cmd_in == MTWEOF)
2883 STps->rw = ST_IDLE;
2884 } else { /* SCSI command was not completely successful. Don't return
2885 from this block without releasing the SCSI command block! */
2886 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2887
2888 if (cmdstatp->flags & SENSE_EOM) {
2889 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2890 cmd_in != MTBSR && cmd_in != MTBSS)
2891 STps->eof = ST_EOM_OK;
2892 STps->drv_block = 0;
2893 }
2894
2895 if (cmdstatp->remainder_valid)
2896 undone = (int)cmdstatp->uremainder64;
2897 else
2898 undone = 0;
2899
2900 if (cmd_in == MTWEOF &&
2901 cmdstatp->have_sense &&
2902 (cmdstatp->flags & SENSE_EOM)) {
2903 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2904 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2905 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2906 STps->eof = ST_NOEOF;
2907 } else { /* Writing EOF(s) failed */
2908 if (fileno >= 0)
2909 fileno -= undone;
2910 if (undone < arg)
2911 STps->eof = ST_NOEOF;
2912 }
2913 STps->drv_file = fileno;
2914 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2915 if (fileno >= 0)
2916 STps->drv_file = fileno - undone;
2917 else
2918 STps->drv_file = fileno;
2919 STps->drv_block = -1;
2920 STps->eof = ST_NOEOF;
2921 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2922 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2923 undone = (-undone);
2924 if (STps->drv_file >= 0)
2925 STps->drv_file = fileno + undone;
2926 STps->drv_block = 0;
2927 STps->eof = ST_NOEOF;
2928 } else if (cmd_in == MTFSR) {
2929 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2930 if (STps->drv_file >= 0)
2931 STps->drv_file++;
2932 STps->drv_block = 0;
2933 STps->eof = ST_FM;
2934 } else {
2935 if (blkno >= undone)
2936 STps->drv_block = blkno - undone;
2937 else
2938 STps->drv_block = (-1);
2939 STps->eof = ST_NOEOF;
2940 }
2941 } else if (cmd_in == MTBSR) {
2942 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2943 STps->drv_file--;
2944 STps->drv_block = (-1);
2945 } else {
2946 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2947 undone = (-undone);
2948 if (STps->drv_block >= 0)
2949 STps->drv_block = blkno + undone;
2950 }
2951 STps->eof = ST_NOEOF;
2952 } else if (cmd_in == MTEOM) {
2953 STps->drv_file = (-1);
2954 STps->drv_block = (-1);
2955 STps->eof = ST_EOD;
2956 } else if (cmd_in == MTSETBLK ||
2957 cmd_in == MTSETDENSITY ||
2958 cmd_in == MTSETDRVBUFFER ||
2959 cmd_in == SET_DENS_AND_BLK) {
2960 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2961 !(STp->use_pf & PF_TESTED)) {
2962 /* Try the other possible state of Page Format if not
2963 already tried */
2964 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
2965 st_release_request(SRpnt);
2966 SRpnt = NULL;
2967 return st_int_ioctl(STp, cmd_in, arg);
2968 }
2969 } else if (chg_eof)
2970 STps->eof = ST_NOEOF;
2971
2972 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
2973 STps->eof = ST_EOD;
2974
2975 st_release_request(SRpnt);
2976 SRpnt = NULL;
2977 }
2978
2979 return ioctl_result;
2980 }
2981 \f
2982
2983 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
2984 structure. */
2985
2986 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
2987 int logical)
2988 {
2989 int result;
2990 unsigned char scmd[MAX_COMMAND_SIZE];
2991 struct st_request *SRpnt;
2992 DEB( char *name = tape_name(STp); )
2993
2994 if (STp->ready != ST_READY)
2995 return (-EIO);
2996
2997 memset(scmd, 0, MAX_COMMAND_SIZE);
2998 if ((STp->device)->scsi_level < SCSI_2) {
2999 scmd[0] = QFA_REQUEST_BLOCK;
3000 scmd[4] = 3;
3001 } else {
3002 scmd[0] = READ_POSITION;
3003 if (!logical && !STp->scsi2_logical)
3004 scmd[1] = 1;
3005 }
3006 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3007 STp->device->request_queue->rq_timeout,
3008 MAX_READY_RETRIES, 1);
3009 if (!SRpnt)
3010 return (STp->buffer)->syscall_result;
3011
3012 if ((STp->buffer)->syscall_result != 0 ||
3013 (STp->device->scsi_level >= SCSI_2 &&
3014 ((STp->buffer)->b_data[0] & 4) != 0)) {
3015 *block = *partition = 0;
3016 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3017 result = (-EIO);
3018 } else {
3019 result = 0;
3020 if ((STp->device)->scsi_level < SCSI_2) {
3021 *block = ((STp->buffer)->b_data[0] << 16)
3022 + ((STp->buffer)->b_data[1] << 8)
3023 + (STp->buffer)->b_data[2];
3024 *partition = 0;
3025 } else {
3026 *block = ((STp->buffer)->b_data[4] << 24)
3027 + ((STp->buffer)->b_data[5] << 16)
3028 + ((STp->buffer)->b_data[6] << 8)
3029 + (STp->buffer)->b_data[7];
3030 *partition = (STp->buffer)->b_data[1];
3031 if (((STp->buffer)->b_data[0] & 0x80) &&
3032 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3033 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3034 }
3035 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3036 *block, *partition));
3037 }
3038 st_release_request(SRpnt);
3039 SRpnt = NULL;
3040
3041 return result;
3042 }
3043
3044
3045 /* Set the tape block and partition. Negative partition means that only the
3046 block should be set in vendor specific way. */
3047 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3048 int logical)
3049 {
3050 struct st_partstat *STps;
3051 int result, p;
3052 unsigned int blk;
3053 int timeout;
3054 unsigned char scmd[MAX_COMMAND_SIZE];
3055 struct st_request *SRpnt;
3056 DEB( char *name = tape_name(STp); )
3057
3058 if (STp->ready != ST_READY)
3059 return (-EIO);
3060 timeout = STp->long_timeout;
3061 STps = &(STp->ps[STp->partition]);
3062
3063 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3064 name, block, partition));
3065 DEB(if (partition < 0)
3066 return (-EIO); )
3067
3068 /* Update the location at the partition we are leaving */
3069 if ((!STp->can_partitions && partition != 0) ||
3070 partition >= ST_NBR_PARTITIONS)
3071 return (-EINVAL);
3072 if (partition != STp->partition) {
3073 if (get_location(STp, &blk, &p, 1))
3074 STps->last_block_valid = 0;
3075 else {
3076 STps->last_block_valid = 1;
3077 STps->last_block_visited = blk;
3078 DEBC(printk(ST_DEB_MSG
3079 "%s: Visited block %d for partition %d saved.\n",
3080 name, blk, STp->partition));
3081 }
3082 }
3083
3084 memset(scmd, 0, MAX_COMMAND_SIZE);
3085 if ((STp->device)->scsi_level < SCSI_2) {
3086 scmd[0] = QFA_SEEK_BLOCK;
3087 scmd[2] = (block >> 16);
3088 scmd[3] = (block >> 8);
3089 scmd[4] = block;
3090 scmd[5] = 0;
3091 } else {
3092 scmd[0] = SEEK_10;
3093 scmd[3] = (block >> 24);
3094 scmd[4] = (block >> 16);
3095 scmd[5] = (block >> 8);
3096 scmd[6] = block;
3097 if (!logical && !STp->scsi2_logical)
3098 scmd[1] = 4;
3099 if (STp->partition != partition) {
3100 scmd[1] |= 2;
3101 scmd[8] = partition;
3102 DEBC(printk(ST_DEB_MSG
3103 "%s: Trying to change partition from %d to %d\n",
3104 name, STp->partition, partition));
3105 }
3106 }
3107 if (STp->immediate) {
3108 scmd[1] |= 1; /* Don't wait for completion */
3109 timeout = STp->device->request_queue->rq_timeout;
3110 }
3111
3112 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3113 timeout, MAX_READY_RETRIES, 1);
3114 if (!SRpnt)
3115 return (STp->buffer)->syscall_result;
3116
3117 STps->drv_block = STps->drv_file = (-1);
3118 STps->eof = ST_NOEOF;
3119 if ((STp->buffer)->syscall_result != 0) {
3120 result = (-EIO);
3121 if (STp->can_partitions &&
3122 (STp->device)->scsi_level >= SCSI_2 &&
3123 (p = find_partition(STp)) >= 0)
3124 STp->partition = p;
3125 } else {
3126 if (STp->can_partitions) {
3127 STp->partition = partition;
3128 STps = &(STp->ps[partition]);
3129 if (!STps->last_block_valid ||
3130 STps->last_block_visited != block) {
3131 STps->at_sm = 0;
3132 STps->rw = ST_IDLE;
3133 }
3134 } else
3135 STps->at_sm = 0;
3136 if (block == 0)
3137 STps->drv_block = STps->drv_file = 0;
3138 result = 0;
3139 }
3140
3141 st_release_request(SRpnt);
3142 SRpnt = NULL;
3143
3144 return result;
3145 }
3146
3147
3148 /* Find the current partition number for the drive status. Called from open and
3149 returns either partition number of negative error code. */
3150 static int find_partition(struct scsi_tape *STp)
3151 {
3152 int i, partition;
3153 unsigned int block;
3154
3155 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3156 return i;
3157 if (partition >= ST_NBR_PARTITIONS)
3158 return (-EIO);
3159 return partition;
3160 }
3161
3162
3163 /* Change the partition if necessary */
3164 static int switch_partition(struct scsi_tape *STp)
3165 {
3166 struct st_partstat *STps;
3167
3168 if (STp->partition == STp->new_partition)
3169 return 0;
3170 STps = &(STp->ps[STp->new_partition]);
3171 if (!STps->last_block_valid)
3172 STps->last_block_visited = 0;
3173 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3174 }
3175 \f
3176 /* Functions for reading and writing the medium partition mode page. */
3177
3178 #define PART_PAGE 0x11
3179 #define PART_PAGE_FIXED_LENGTH 8
3180
3181 #define PP_OFF_MAX_ADD_PARTS 2
3182 #define PP_OFF_NBR_ADD_PARTS 3
3183 #define PP_OFF_FLAGS 4
3184 #define PP_OFF_PART_UNITS 6
3185 #define PP_OFF_RESERVED 7
3186
3187 #define PP_BIT_IDP 0x20
3188 #define PP_MSK_PSUM_MB 0x10
3189
3190 /* Get the number of partitions on the tape. As a side effect reads the
3191 mode page into the tape buffer. */
3192 static int nbr_partitions(struct scsi_tape *STp)
3193 {
3194 int result;
3195 DEB( char *name = tape_name(STp); )
3196
3197 if (STp->ready != ST_READY)
3198 return (-EIO);
3199
3200 result = read_mode_page(STp, PART_PAGE, 1);
3201
3202 if (result) {
3203 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3204 name));
3205 result = (-EIO);
3206 } else {
3207 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3208 PP_OFF_NBR_ADD_PARTS] + 1;
3209 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3210 }
3211
3212 return result;
3213 }
3214
3215
3216 /* Partition the tape into two partitions if size > 0 or one partition if
3217 size == 0.
3218
3219 The block descriptors are read and written because Sony SDT-7000 does not
3220 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3221
3222 My HP C1533A drive returns only one partition size field. This is used to
3223 set the size of partition 1. There is no size field for the default partition.
3224 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3225 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3226 The following algorithm is used to accommodate both drives: if the number of
3227 partition size fields is greater than the maximum number of additional partitions
3228 in the mode page, the second field is used. Otherwise the first field is used.
3229
3230 For Seagate DDS drives the page length must be 8 when no partitions is defined
3231 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3232 is acceptable also to some other old drives and enforced if the first partition
3233 size field is used for the first additional partition size.
3234 */
3235 static int partition_tape(struct scsi_tape *STp, int size)
3236 {
3237 char *name = tape_name(STp);
3238 int result;
3239 int pgo, psd_cnt, psdo;
3240 unsigned char *bp;
3241
3242 result = read_mode_page(STp, PART_PAGE, 0);
3243 if (result) {
3244 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3245 return result;
3246 }
3247 /* The mode page is in the buffer. Let's modify it and write it. */
3248 bp = (STp->buffer)->b_data;
3249 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3250 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3251 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3252
3253 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3254 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3255 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3256 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3257 psdo += 2;
3258 }
3259 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3260
3261 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3262 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3263 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3264
3265 if (size <= 0) {
3266 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3267 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3268 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3269 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3270 name));
3271 } else {
3272 bp[psdo] = (size >> 8) & 0xff;
3273 bp[psdo + 1] = size & 0xff;
3274 bp[pgo + 3] = 1;
3275 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3276 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3277 DEBC(printk(ST_DEB_MSG
3278 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3279 name, size));
3280 }
3281 bp[pgo + PP_OFF_PART_UNITS] = 0;
3282 bp[pgo + PP_OFF_RESERVED] = 0;
3283 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3284
3285 result = write_mode_page(STp, PART_PAGE, 1);
3286 if (result) {
3287 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3288 result = (-EIO);
3289 }
3290
3291 return result;
3292 }
3293 \f
3294
3295
3296 /* The ioctl command */
3297 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3298 {
3299 int i, cmd_nr, cmd_type, bt;
3300 int retval = 0;
3301 unsigned int blk;
3302 struct scsi_tape *STp = file->private_data;
3303 struct st_modedef *STm;
3304 struct st_partstat *STps;
3305 char *name = tape_name(STp);
3306 void __user *p = (void __user *)arg;
3307
3308 if (mutex_lock_interruptible(&STp->lock))
3309 return -ERESTARTSYS;
3310
3311 DEB(
3312 if (debugging && !STp->in_use) {
3313 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3314 retval = (-EIO);
3315 goto out;
3316 } ) /* end DEB */
3317
3318 STm = &(STp->modes[STp->current_mode]);
3319 STps = &(STp->ps[STp->partition]);
3320
3321 /*
3322 * If we are in the middle of error recovery, don't let anyone
3323 * else try and use this device. Also, if error recovery fails, it
3324 * may try and take the device offline, in which case all further
3325 * access to the device is prohibited.
3326 */
3327 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3328 file->f_flags & O_NDELAY);
3329 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3330 goto out;
3331 retval = 0;
3332
3333 cmd_type = _IOC_TYPE(cmd_in);
3334 cmd_nr = _IOC_NR(cmd_in);
3335
3336 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3337 struct mtop mtc;
3338
3339 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3340 retval = (-EINVAL);
3341 goto out;
3342 }
3343
3344 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3345 if (i) {
3346 retval = (-EFAULT);
3347 goto out;
3348 }
3349
3350 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3351 printk(KERN_WARNING
3352 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3353 retval = (-EPERM);
3354 goto out;
3355 }
3356 if (!STm->defined &&
3357 (mtc.mt_op != MTSETDRVBUFFER &&
3358 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3359 retval = (-ENXIO);
3360 goto out;
3361 }
3362
3363 if (!STp->pos_unknown) {
3364
3365 if (STps->eof == ST_FM_HIT) {
3366 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3367 mtc.mt_op == MTEOM) {
3368 mtc.mt_count -= 1;
3369 if (STps->drv_file >= 0)
3370 STps->drv_file += 1;
3371 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3372 mtc.mt_count += 1;
3373 if (STps->drv_file >= 0)
3374 STps->drv_file += 1;
3375 }
3376 }
3377
3378 if (mtc.mt_op == MTSEEK) {
3379 /* Old position must be restored if partition will be
3380 changed */
3381 i = !STp->can_partitions ||
3382 (STp->new_partition != STp->partition);
3383 } else {
3384 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3385 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3386 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3387 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3388 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3389 mtc.mt_op == MTCOMPRESSION;
3390 }
3391 i = flush_buffer(STp, i);
3392 if (i < 0) {
3393 retval = i;
3394 goto out;
3395 }
3396 if (STps->rw == ST_WRITING &&
3397 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3398 mtc.mt_op == MTSEEK ||
3399 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3400 i = st_int_ioctl(STp, MTWEOF, 1);
3401 if (i < 0) {
3402 retval = i;
3403 goto out;
3404 }
3405 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3406 mtc.mt_count++;
3407 STps->rw = ST_IDLE;
3408 }
3409
3410 } else {
3411 /*
3412 * If there was a bus reset, block further access
3413 * to this device. If the user wants to rewind the tape,
3414 * then reset the flag and allow access again.
3415 */
3416 if (mtc.mt_op != MTREW &&
3417 mtc.mt_op != MTOFFL &&
3418 mtc.mt_op != MTRETEN &&
3419 mtc.mt_op != MTERASE &&
3420 mtc.mt_op != MTSEEK &&
3421 mtc.mt_op != MTEOM) {
3422 retval = (-EIO);
3423 goto out;
3424 }
3425 reset_state(STp);
3426 /* remove this when the midlevel properly clears was_reset */
3427 STp->device->was_reset = 0;
3428 }
3429
3430 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3431 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3432 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3433 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3434
3435 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3436 do_door_lock(STp, 0); /* Ignore result! */
3437
3438 if (mtc.mt_op == MTSETDRVBUFFER &&
3439 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3440 retval = st_set_options(STp, mtc.mt_count);
3441 goto out;
3442 }
3443
3444 if (mtc.mt_op == MTSETPART) {
3445 if (!STp->can_partitions ||
3446 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3447 retval = (-EINVAL);
3448 goto out;
3449 }
3450 if (mtc.mt_count >= STp->nbr_partitions &&
3451 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3452 retval = (-EIO);
3453 goto out;
3454 }
3455 if (mtc.mt_count >= STp->nbr_partitions) {
3456 retval = (-EINVAL);
3457 goto out;
3458 }
3459 STp->new_partition = mtc.mt_count;
3460 retval = 0;
3461 goto out;
3462 }
3463
3464 if (mtc.mt_op == MTMKPART) {
3465 if (!STp->can_partitions) {
3466 retval = (-EINVAL);
3467 goto out;
3468 }
3469 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3470 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3471 retval = i;
3472 goto out;
3473 }
3474 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3475 STp->ps[i].rw = ST_IDLE;
3476 STp->ps[i].at_sm = 0;
3477 STp->ps[i].last_block_valid = 0;
3478 }
3479 STp->partition = STp->new_partition = 0;
3480 STp->nbr_partitions = 1; /* Bad guess ?-) */
3481 STps->drv_block = STps->drv_file = 0;
3482 retval = 0;
3483 goto out;
3484 }
3485
3486 if (mtc.mt_op == MTSEEK) {
3487 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3488 if (!STp->can_partitions)
3489 STp->ps[0].rw = ST_IDLE;
3490 retval = i;
3491 goto out;
3492 }
3493
3494 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3495 retval = do_load_unload(STp, file, 0);
3496 goto out;
3497 }
3498
3499 if (mtc.mt_op == MTLOAD) {
3500 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3501 goto out;
3502 }
3503
3504 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3505 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3506 goto out;
3507 }
3508
3509 if (STp->can_partitions && STp->ready == ST_READY &&
3510 (i = switch_partition(STp)) < 0) {
3511 retval = i;
3512 goto out;
3513 }
3514
3515 if (mtc.mt_op == MTCOMPRESSION)
3516 retval = st_compression(STp, (mtc.mt_count & 1));
3517 else
3518 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3519 goto out;
3520 }
3521 if (!STm->defined) {
3522 retval = (-ENXIO);
3523 goto out;
3524 }
3525
3526 if ((i = flush_buffer(STp, 0)) < 0) {
3527 retval = i;
3528 goto out;
3529 }
3530 if (STp->can_partitions &&
3531 (i = switch_partition(STp)) < 0) {
3532 retval = i;
3533 goto out;
3534 }
3535
3536 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3537 struct mtget mt_status;
3538
3539 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3540 retval = (-EINVAL);
3541 goto out;
3542 }
3543
3544 mt_status.mt_type = STp->tape_type;
3545 mt_status.mt_dsreg =
3546 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3547 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3548 mt_status.mt_blkno = STps->drv_block;
3549 mt_status.mt_fileno = STps->drv_file;
3550 if (STp->block_size != 0) {
3551 if (STps->rw == ST_WRITING)
3552 mt_status.mt_blkno +=
3553 (STp->buffer)->buffer_bytes / STp->block_size;
3554 else if (STps->rw == ST_READING)
3555 mt_status.mt_blkno -=
3556 ((STp->buffer)->buffer_bytes +
3557 STp->block_size - 1) / STp->block_size;
3558 }
3559
3560 mt_status.mt_gstat = 0;
3561 if (STp->drv_write_prot)
3562 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3563 if (mt_status.mt_blkno == 0) {
3564 if (mt_status.mt_fileno == 0)
3565 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3566 else
3567 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3568 }
3569 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3570 mt_status.mt_resid = STp->partition;
3571 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3572 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3573 else if (STps->eof >= ST_EOM_OK)
3574 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3575 if (STp->density == 1)
3576 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3577 else if (STp->density == 2)
3578 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3579 else if (STp->density == 3)
3580 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3581 if (STp->ready == ST_READY)
3582 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3583 if (STp->ready == ST_NO_TAPE)
3584 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3585 if (STps->at_sm)
3586 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3587 if (STm->do_async_writes ||
3588 (STm->do_buffer_writes && STp->block_size != 0) ||
3589 STp->drv_buffer != 0)
3590 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3591 if (STp->cleaning_req)
3592 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3593
3594 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3595 if (i) {
3596 retval = (-EFAULT);
3597 goto out;
3598 }
3599
3600 STp->recover_reg = 0; /* Clear after read */
3601 retval = 0;
3602 goto out;
3603 } /* End of MTIOCGET */
3604 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3605 struct mtpos mt_pos;
3606 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3607 retval = (-EINVAL);
3608 goto out;
3609 }
3610 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3611 retval = i;
3612 goto out;
3613 }
3614 mt_pos.mt_blkno = blk;
3615 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3616 if (i)
3617 retval = (-EFAULT);
3618 goto out;
3619 }
3620 mutex_unlock(&STp->lock);
3621 switch (cmd_in) {
3622 case SCSI_IOCTL_GET_IDLUN:
3623 case SCSI_IOCTL_GET_BUS_NUMBER:
3624 break;
3625 default:
3626 if ((cmd_in == SG_IO ||
3627 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3628 cmd_in == CDROM_SEND_PACKET) &&
3629 !capable(CAP_SYS_RAWIO))
3630 i = -EPERM;
3631 else
3632 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3633 file->f_mode, cmd_in, p);
3634 if (i != -ENOTTY)
3635 return i;
3636 break;
3637 }
3638 retval = scsi_ioctl(STp->device, cmd_in, p);
3639 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3640 STp->rew_at_close = 0;
3641 STp->ready = ST_NO_TAPE;
3642 }
3643 return retval;
3644
3645 out:
3646 mutex_unlock(&STp->lock);
3647 return retval;
3648 }
3649
3650 #ifdef CONFIG_COMPAT
3651 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3652 {
3653 struct scsi_tape *STp = file->private_data;
3654 struct scsi_device *sdev = STp->device;
3655 int ret = -ENOIOCTLCMD;
3656 if (sdev->host->hostt->compat_ioctl) {
3657
3658 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3659
3660 }
3661 return ret;
3662 }
3663 #endif
3664
3665 \f
3666
3667 /* Try to allocate a new tape buffer. Calling function must not hold
3668 dev_arr_lock. */
3669 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3670 {
3671 struct st_buffer *tb;
3672
3673 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3674 if (!tb) {
3675 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3676 return NULL;
3677 }
3678 tb->frp_segs = 0;
3679 tb->use_sg = max_sg;
3680 tb->dma = need_dma;
3681 tb->buffer_size = 0;
3682
3683 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3684 GFP_ATOMIC);
3685 if (!tb->reserved_pages) {
3686 kfree(tb);
3687 return NULL;
3688 }
3689
3690 return tb;
3691 }
3692
3693
3694 /* Try to allocate enough space in the tape buffer */
3695 #define ST_MAX_ORDER 6
3696
3697 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3698 {
3699 int segs, nbr, max_segs, b_size, order, got;
3700 gfp_t priority;
3701
3702 if (new_size <= STbuffer->buffer_size)
3703 return 1;
3704
3705 if (STbuffer->buffer_size <= PAGE_SIZE)
3706 normalize_buffer(STbuffer); /* Avoid extra segment */
3707
3708 max_segs = STbuffer->use_sg;
3709 nbr = max_segs - STbuffer->frp_segs;
3710 if (nbr <= 0)
3711 return 0;
3712
3713 priority = GFP_KERNEL | __GFP_NOWARN;
3714 if (need_dma)
3715 priority |= GFP_DMA;
3716
3717 if (STbuffer->cleared)
3718 priority |= __GFP_ZERO;
3719
3720 if (STbuffer->frp_segs) {
3721 order = STbuffer->map_data.page_order;
3722 b_size = PAGE_SIZE << order;
3723 } else {
3724 for (b_size = PAGE_SIZE, order = 0;
3725 order < ST_MAX_ORDER && b_size < new_size;
3726 order++, b_size *= 2)
3727 ; /* empty */
3728 }
3729 if (max_segs * (PAGE_SIZE << order) < new_size) {
3730 if (order == ST_MAX_ORDER)
3731 return 0;
3732 normalize_buffer(STbuffer);
3733 return enlarge_buffer(STbuffer, new_size, need_dma);
3734 }
3735
3736 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3737 segs < max_segs && got < new_size;) {
3738 struct page *page;
3739
3740 page = alloc_pages(priority, order);
3741 if (!page) {
3742 DEB(STbuffer->buffer_size = got);
3743 normalize_buffer(STbuffer);
3744 return 0;
3745 }
3746
3747 STbuffer->frp_segs += 1;
3748 got += b_size;
3749 STbuffer->buffer_size = got;
3750 STbuffer->reserved_pages[segs] = page;
3751 segs++;
3752 }
3753 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3754 STbuffer->map_data.page_order = order;
3755
3756 return 1;
3757 }
3758
3759
3760 /* Make sure that no data from previous user is in the internal buffer */
3761 static void clear_buffer(struct st_buffer * st_bp)
3762 {
3763 int i;
3764
3765 for (i=0; i < st_bp->frp_segs; i++)
3766 memset(page_address(st_bp->reserved_pages[i]), 0,
3767 PAGE_SIZE << st_bp->map_data.page_order);
3768 st_bp->cleared = 1;
3769 }
3770
3771
3772 /* Release the extra buffer */
3773 static void normalize_buffer(struct st_buffer * STbuffer)
3774 {
3775 int i, order = STbuffer->map_data.page_order;
3776
3777 for (i = 0; i < STbuffer->frp_segs; i++) {
3778 __free_pages(STbuffer->reserved_pages[i], order);
3779 STbuffer->buffer_size -= (PAGE_SIZE << order);
3780 }
3781 STbuffer->frp_segs = 0;
3782 STbuffer->sg_segs = 0;
3783 STbuffer->map_data.page_order = 0;
3784 STbuffer->map_data.offset = 0;
3785 }
3786
3787
3788 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3789 negative error code. */
3790 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3791 {
3792 int i, cnt, res, offset;
3793 int length = PAGE_SIZE << st_bp->map_data.page_order;
3794
3795 for (i = 0, offset = st_bp->buffer_bytes;
3796 i < st_bp->frp_segs && offset >= length; i++)
3797 offset -= length;
3798 if (i == st_bp->frp_segs) { /* Should never happen */
3799 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3800 return (-EIO);
3801 }
3802 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3803 struct page *page = st_bp->reserved_pages[i];
3804 cnt = length - offset < do_count ? length - offset : do_count;
3805 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3806 if (res)
3807 return (-EFAULT);
3808 do_count -= cnt;
3809 st_bp->buffer_bytes += cnt;
3810 ubp += cnt;
3811 offset = 0;
3812 }
3813 if (do_count) /* Should never happen */
3814 return (-EIO);
3815
3816 return 0;
3817 }
3818
3819
3820 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
3821 negative error code. */
3822 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3823 {
3824 int i, cnt, res, offset;
3825 int length = PAGE_SIZE << st_bp->map_data.page_order;
3826
3827 for (i = 0, offset = st_bp->read_pointer;
3828 i < st_bp->frp_segs && offset >= length; i++)
3829 offset -= length;
3830 if (i == st_bp->frp_segs) { /* Should never happen */
3831 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3832 return (-EIO);
3833 }
3834 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3835 struct page *page = st_bp->reserved_pages[i];
3836 cnt = length - offset < do_count ? length - offset : do_count;
3837 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3838 if (res)
3839 return (-EFAULT);
3840 do_count -= cnt;
3841 st_bp->buffer_bytes -= cnt;
3842 st_bp->read_pointer += cnt;
3843 ubp += cnt;
3844 offset = 0;
3845 }
3846 if (do_count) /* Should never happen */
3847 return (-EIO);
3848
3849 return 0;
3850 }
3851
3852
3853 /* Move data towards start of buffer */
3854 static void move_buffer_data(struct st_buffer * st_bp, int offset)
3855 {
3856 int src_seg, dst_seg, src_offset = 0, dst_offset;
3857 int count, total;
3858 int length = PAGE_SIZE << st_bp->map_data.page_order;
3859
3860 if (offset == 0)
3861 return;
3862
3863 total=st_bp->buffer_bytes - offset;
3864 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3865 src_offset = offset;
3866 if (src_offset < length)
3867 break;
3868 offset -= length;
3869 }
3870
3871 st_bp->buffer_bytes = st_bp->read_pointer = total;
3872 for (dst_seg=dst_offset=0; total > 0; ) {
3873 struct page *dpage = st_bp->reserved_pages[dst_seg];
3874 struct page *spage = st_bp->reserved_pages[src_seg];
3875
3876 count = min(length - dst_offset, length - src_offset);
3877 memmove(page_address(dpage) + dst_offset,
3878 page_address(spage) + src_offset, count);
3879 src_offset += count;
3880 if (src_offset >= length) {
3881 src_seg++;
3882 src_offset = 0;
3883 }
3884 dst_offset += count;
3885 if (dst_offset >= length) {
3886 dst_seg++;
3887 dst_offset = 0;
3888 }
3889 total -= count;
3890 }
3891 }
3892
3893 /* Validate the options from command line or module parameters */
3894 static void validate_options(void)
3895 {
3896 if (buffer_kbs > 0)
3897 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3898 if (max_sg_segs >= ST_FIRST_SG)
3899 st_max_sg_segs = max_sg_segs;
3900 }
3901
3902 #ifndef MODULE
3903 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3904 */
3905 static int __init st_setup(char *str)
3906 {
3907 int i, len, ints[5];
3908 char *stp;
3909
3910 stp = get_options(str, ARRAY_SIZE(ints), ints);
3911
3912 if (ints[0] > 0) {
3913 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3914 if (parms[i].val)
3915 *parms[i].val = ints[i + 1];
3916 } else {
3917 while (stp != NULL) {
3918 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3919 len = strlen(parms[i].name);
3920 if (!strncmp(stp, parms[i].name, len) &&
3921 (*(stp + len) == ':' || *(stp + len) == '=')) {
3922 if (parms[i].val)
3923 *parms[i].val =
3924 simple_strtoul(stp + len + 1, NULL, 0);
3925 else
3926 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3927 parms[i].name);
3928 break;
3929 }
3930 }
3931 if (i >= ARRAY_SIZE(parms))
3932 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3933 stp);
3934 stp = strchr(stp, ',');
3935 if (stp)
3936 stp++;
3937 }
3938 }
3939
3940 validate_options();
3941
3942 return 1;
3943 }
3944
3945 __setup("st=", st_setup);
3946
3947 #endif
3948
3949 static const struct file_operations st_fops =
3950 {
3951 .owner = THIS_MODULE,
3952 .read = st_read,
3953 .write = st_write,
3954 .unlocked_ioctl = st_ioctl,
3955 #ifdef CONFIG_COMPAT
3956 .compat_ioctl = st_compat_ioctl,
3957 #endif
3958 .open = st_open,
3959 .flush = st_flush,
3960 .release = st_release,
3961 };
3962
3963 static int st_probe(struct device *dev)
3964 {
3965 struct scsi_device *SDp = to_scsi_device(dev);
3966 struct gendisk *disk = NULL;
3967 struct cdev *cdev = NULL;
3968 struct scsi_tape *tpnt = NULL;
3969 struct st_modedef *STm;
3970 struct st_partstat *STps;
3971 struct st_buffer *buffer;
3972 int i, j, mode, dev_num, error;
3973 char *stp;
3974
3975 if (SDp->type != TYPE_TAPE)
3976 return -ENODEV;
3977 if ((stp = st_incompatible(SDp))) {
3978 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
3979 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
3980 return -ENODEV;
3981 }
3982
3983 i = min(queue_max_hw_segments(SDp->request_queue),
3984 queue_max_phys_segments(SDp->request_queue));
3985 if (st_max_sg_segs < i)
3986 i = st_max_sg_segs;
3987 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
3988 if (buffer == NULL) {
3989 printk(KERN_ERR
3990 "st: Can't allocate new tape buffer. Device not attached.\n");
3991 goto out;
3992 }
3993
3994 disk = alloc_disk(1);
3995 if (!disk) {
3996 printk(KERN_ERR "st: out of memory. Device not attached.\n");
3997 goto out_buffer_free;
3998 }
3999
4000 write_lock(&st_dev_arr_lock);
4001 if (st_nr_dev >= st_dev_max) {
4002 struct scsi_tape **tmp_da;
4003 int tmp_dev_max;
4004
4005 tmp_dev_max = max(st_nr_dev * 2, 8);
4006 if (tmp_dev_max > ST_MAX_TAPES)
4007 tmp_dev_max = ST_MAX_TAPES;
4008 if (tmp_dev_max <= st_nr_dev) {
4009 write_unlock(&st_dev_arr_lock);
4010 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4011 ST_MAX_TAPES);
4012 goto out_put_disk;
4013 }
4014
4015 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
4016 if (tmp_da == NULL) {
4017 write_unlock(&st_dev_arr_lock);
4018 printk(KERN_ERR "st: Can't extend device array.\n");
4019 goto out_put_disk;
4020 }
4021
4022 if (scsi_tapes != NULL) {
4023 memcpy(tmp_da, scsi_tapes,
4024 st_dev_max * sizeof(struct scsi_tape *));
4025 kfree(scsi_tapes);
4026 }
4027 scsi_tapes = tmp_da;
4028
4029 st_dev_max = tmp_dev_max;
4030 }
4031
4032 for (i = 0; i < st_dev_max; i++)
4033 if (scsi_tapes[i] == NULL)
4034 break;
4035 if (i >= st_dev_max)
4036 panic("scsi_devices corrupt (st)");
4037
4038 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4039 if (tpnt == NULL) {
4040 write_unlock(&st_dev_arr_lock);
4041 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4042 goto out_put_disk;
4043 }
4044 kref_init(&tpnt->kref);
4045 tpnt->disk = disk;
4046 sprintf(disk->disk_name, "st%d", i);
4047 disk->private_data = &tpnt->driver;
4048 disk->queue = SDp->request_queue;
4049 tpnt->driver = &st_template;
4050 scsi_tapes[i] = tpnt;
4051 dev_num = i;
4052
4053 tpnt->device = SDp;
4054 if (SDp->scsi_level <= 2)
4055 tpnt->tape_type = MT_ISSCSI1;
4056 else
4057 tpnt->tape_type = MT_ISSCSI2;
4058
4059 tpnt->buffer = buffer;
4060 tpnt->buffer->last_SRpnt = NULL;
4061
4062 tpnt->inited = 0;
4063 tpnt->dirty = 0;
4064 tpnt->in_use = 0;
4065 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4066 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4067 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4068 tpnt->density = 0;
4069 tpnt->do_auto_lock = ST_AUTO_LOCK;
4070 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4071 tpnt->can_partitions = 0;
4072 tpnt->two_fm = ST_TWO_FM;
4073 tpnt->fast_mteom = ST_FAST_MTEOM;
4074 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4075 tpnt->sili = ST_SILI;
4076 tpnt->immediate = ST_NOWAIT;
4077 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4078 tpnt->partition = 0;
4079 tpnt->new_partition = 0;
4080 tpnt->nbr_partitions = 0;
4081 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4082 tpnt->long_timeout = ST_LONG_TIMEOUT;
4083 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4084
4085 for (i = 0; i < ST_NBR_MODES; i++) {
4086 STm = &(tpnt->modes[i]);
4087 STm->defined = 0;
4088 STm->sysv = ST_SYSV;
4089 STm->defaults_for_writes = 0;
4090 STm->do_async_writes = ST_ASYNC_WRITES;
4091 STm->do_buffer_writes = ST_BUFFER_WRITES;
4092 STm->do_read_ahead = ST_READ_AHEAD;
4093 STm->default_compression = ST_DONT_TOUCH;
4094 STm->default_blksize = (-1); /* No forced size */
4095 STm->default_density = (-1); /* No forced density */
4096 }
4097
4098 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4099 STps = &(tpnt->ps[i]);
4100 STps->rw = ST_IDLE;
4101 STps->eof = ST_NOEOF;
4102 STps->at_sm = 0;
4103 STps->last_block_valid = 0;
4104 STps->drv_block = (-1);
4105 STps->drv_file = (-1);
4106 }
4107
4108 tpnt->current_mode = 0;
4109 tpnt->modes[0].defined = 1;
4110
4111 tpnt->density_changed = tpnt->compression_changed =
4112 tpnt->blksize_changed = 0;
4113 mutex_init(&tpnt->lock);
4114
4115 st_nr_dev++;
4116 write_unlock(&st_dev_arr_lock);
4117
4118 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4119 STm = &(tpnt->modes[mode]);
4120 for (j=0; j < 2; j++) {
4121 cdev = cdev_alloc();
4122 if (!cdev) {
4123 printk(KERN_ERR
4124 "st%d: out of memory. Device not attached.\n",
4125 dev_num);
4126 goto out_free_tape;
4127 }
4128 cdev->owner = THIS_MODULE;
4129 cdev->ops = &st_fops;
4130
4131 error = cdev_add(cdev,
4132 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4133 1);
4134 if (error) {
4135 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4136 dev_num, j ? "non" : "auto", mode);
4137 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4138 goto out_free_tape;
4139 }
4140 STm->cdevs[j] = cdev;
4141
4142 }
4143 error = do_create_class_files(tpnt, dev_num, mode);
4144 if (error)
4145 goto out_free_tape;
4146 }
4147
4148 sdev_printk(KERN_NOTICE, SDp,
4149 "Attached scsi tape %s\n", tape_name(tpnt));
4150 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4151 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4152 queue_dma_alignment(SDp->request_queue) + 1);
4153
4154 return 0;
4155
4156 out_free_tape:
4157 for (mode=0; mode < ST_NBR_MODES; mode++) {
4158 STm = &(tpnt->modes[mode]);
4159 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4160 "tape");
4161 for (j=0; j < 2; j++) {
4162 if (STm->cdevs[j]) {
4163 if (cdev == STm->cdevs[j])
4164 cdev = NULL;
4165 device_destroy(st_sysfs_class,
4166 MKDEV(SCSI_TAPE_MAJOR,
4167 TAPE_MINOR(i, mode, j)));
4168 cdev_del(STm->cdevs[j]);
4169 }
4170 }
4171 }
4172 if (cdev)
4173 cdev_del(cdev);
4174 write_lock(&st_dev_arr_lock);
4175 scsi_tapes[dev_num] = NULL;
4176 st_nr_dev--;
4177 write_unlock(&st_dev_arr_lock);
4178 out_put_disk:
4179 put_disk(disk);
4180 kfree(tpnt);
4181 out_buffer_free:
4182 kfree(buffer);
4183 out:
4184 return -ENODEV;
4185 };
4186
4187
4188 static int st_remove(struct device *dev)
4189 {
4190 struct scsi_device *SDp = to_scsi_device(dev);
4191 struct scsi_tape *tpnt;
4192 int i, j, mode;
4193
4194 write_lock(&st_dev_arr_lock);
4195 for (i = 0; i < st_dev_max; i++) {
4196 tpnt = scsi_tapes[i];
4197 if (tpnt != NULL && tpnt->device == SDp) {
4198 scsi_tapes[i] = NULL;
4199 st_nr_dev--;
4200 write_unlock(&st_dev_arr_lock);
4201 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4202 "tape");
4203 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4204 for (j=0; j < 2; j++) {
4205 device_destroy(st_sysfs_class,
4206 MKDEV(SCSI_TAPE_MAJOR,
4207 TAPE_MINOR(i, mode, j)));
4208 cdev_del(tpnt->modes[mode].cdevs[j]);
4209 tpnt->modes[mode].cdevs[j] = NULL;
4210 }
4211 }
4212
4213 mutex_lock(&st_ref_mutex);
4214 kref_put(&tpnt->kref, scsi_tape_release);
4215 mutex_unlock(&st_ref_mutex);
4216 return 0;
4217 }
4218 }
4219
4220 write_unlock(&st_dev_arr_lock);
4221 return 0;
4222 }
4223
4224 /**
4225 * scsi_tape_release - Called to free the Scsi_Tape structure
4226 * @kref: pointer to embedded kref
4227 *
4228 * st_ref_mutex must be held entering this routine. Because it is
4229 * called on last put, you should always use the scsi_tape_get()
4230 * scsi_tape_put() helpers which manipulate the semaphore directly
4231 * and never do a direct kref_put().
4232 **/
4233 static void scsi_tape_release(struct kref *kref)
4234 {
4235 struct scsi_tape *tpnt = to_scsi_tape(kref);
4236 struct gendisk *disk = tpnt->disk;
4237
4238 tpnt->device = NULL;
4239
4240 if (tpnt->buffer) {
4241 normalize_buffer(tpnt->buffer);
4242 kfree(tpnt->buffer->reserved_pages);
4243 kfree(tpnt->buffer);
4244 }
4245
4246 disk->private_data = NULL;
4247 put_disk(disk);
4248 kfree(tpnt);
4249 return;
4250 }
4251
4252 static int __init init_st(void)
4253 {
4254 int err;
4255
4256 validate_options();
4257
4258 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4259 verstr, st_fixed_buffer_size, st_max_sg_segs);
4260
4261 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
4262 if (IS_ERR(st_sysfs_class)) {
4263 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
4264 return PTR_ERR(st_sysfs_class);
4265 }
4266
4267 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4268 ST_MAX_TAPE_ENTRIES, "st");
4269 if (err) {
4270 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4271 SCSI_TAPE_MAJOR);
4272 goto err_class;
4273 }
4274
4275 err = scsi_register_driver(&st_template.gendrv);
4276 if (err)
4277 goto err_chrdev;
4278
4279 err = do_create_sysfs_files();
4280 if (err)
4281 goto err_scsidrv;
4282
4283 return 0;
4284
4285 err_scsidrv:
4286 scsi_unregister_driver(&st_template.gendrv);
4287 err_chrdev:
4288 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4289 ST_MAX_TAPE_ENTRIES);
4290 err_class:
4291 class_destroy(st_sysfs_class);
4292 return err;
4293 }
4294
4295 static void __exit exit_st(void)
4296 {
4297 do_remove_sysfs_files();
4298 scsi_unregister_driver(&st_template.gendrv);
4299 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4300 ST_MAX_TAPE_ENTRIES);
4301 class_destroy(st_sysfs_class);
4302 kfree(scsi_tapes);
4303 printk(KERN_INFO "st: Unloaded.\n");
4304 }
4305
4306 module_init(init_st);
4307 module_exit(exit_st);
4308
4309
4310 /* The sysfs driver interface. Read-only at the moment */
4311 static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4312 {
4313 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4314 }
4315 static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4316
4317 static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4318 {
4319 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4320 }
4321 static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4322
4323 static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4324 {
4325 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4326 }
4327 static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4328
4329 static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4330 {
4331 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4332 }
4333 static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4334
4335 static int do_create_sysfs_files(void)
4336 {
4337 struct device_driver *sysfs = &st_template.gendrv;
4338 int err;
4339
4340 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4341 if (err)
4342 return err;
4343 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4344 if (err)
4345 goto err_try_direct_io;
4346 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4347 if (err)
4348 goto err_attr_fixed_buf;
4349 err = driver_create_file(sysfs, &driver_attr_version);
4350 if (err)
4351 goto err_attr_max_sg;
4352
4353 return 0;
4354
4355 err_attr_max_sg:
4356 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4357 err_attr_fixed_buf:
4358 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4359 err_try_direct_io:
4360 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4361 return err;
4362 }
4363
4364 static void do_remove_sysfs_files(void)
4365 {
4366 struct device_driver *sysfs = &st_template.gendrv;
4367
4368 driver_remove_file(sysfs, &driver_attr_version);
4369 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4370 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4371 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4372 }
4373
4374
4375 /* The sysfs simple class interface */
4376 static ssize_t
4377 st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4378 {
4379 struct st_modedef *STm = dev_get_drvdata(dev);
4380 ssize_t l = 0;
4381
4382 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4383 return l;
4384 }
4385
4386 DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
4387
4388 static ssize_t
4389 st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
4390 {
4391 struct st_modedef *STm = dev_get_drvdata(dev);
4392 ssize_t l = 0;
4393
4394 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4395 return l;
4396 }
4397
4398 DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
4399
4400 static ssize_t
4401 st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
4402 {
4403 struct st_modedef *STm = dev_get_drvdata(dev);
4404 ssize_t l = 0;
4405 char *fmt;
4406
4407 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4408 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4409 return l;
4410 }
4411
4412 DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
4413
4414 static ssize_t
4415 st_defcompression_show(struct device *dev, struct device_attribute *attr,
4416 char *buf)
4417 {
4418 struct st_modedef *STm = dev_get_drvdata(dev);
4419 ssize_t l = 0;
4420
4421 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4422 return l;
4423 }
4424
4425 DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
4426
4427 static ssize_t
4428 st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
4429 {
4430 struct st_modedef *STm = dev_get_drvdata(dev);
4431 struct scsi_tape *STp;
4432 int i, j, options;
4433 ssize_t l = 0;
4434
4435 for (i=0; i < st_dev_max; i++) {
4436 for (j=0; j < ST_NBR_MODES; j++)
4437 if (&scsi_tapes[i]->modes[j] == STm)
4438 break;
4439 if (j < ST_NBR_MODES)
4440 break;
4441 }
4442 if (i == st_dev_max)
4443 return 0; /* should never happen */
4444
4445 STp = scsi_tapes[i];
4446
4447 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4448 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4449 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4450 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4451 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4452 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4453 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4454 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4455 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4456 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4457 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4458 options |= STm->sysv ? MT_ST_SYSV : 0;
4459 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4460 options |= STp->sili ? MT_ST_SILI : 0;
4461
4462 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4463 return l;
4464 }
4465
4466 DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
4467
4468 static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
4469 {
4470 int i, rew, error;
4471 char name[10];
4472 struct device *st_class_member;
4473
4474 for (rew=0; rew < 2; rew++) {
4475 /* Make sure that the minor numbers corresponding to the four
4476 first modes always get the same names */
4477 i = mode << (4 - ST_NBR_MODE_BITS);
4478 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4479 STp->disk->disk_name, st_formats[i]);
4480 st_class_member =
4481 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4482 MKDEV(SCSI_TAPE_MAJOR,
4483 TAPE_MINOR(dev_num, mode, rew)),
4484 &STp->modes[mode], "%s", name);
4485 if (IS_ERR(st_class_member)) {
4486 printk(KERN_WARNING "st%d: device_create failed\n",
4487 dev_num);
4488 error = PTR_ERR(st_class_member);
4489 goto out;
4490 }
4491
4492 error = device_create_file(st_class_member,
4493 &dev_attr_defined);
4494 if (error) goto out;
4495 error = device_create_file(st_class_member,
4496 &dev_attr_default_blksize);
4497 if (error) goto out;
4498 error = device_create_file(st_class_member,
4499 &dev_attr_default_density);
4500 if (error) goto out;
4501 error = device_create_file(st_class_member,
4502 &dev_attr_default_compression);
4503 if (error) goto out;
4504 error = device_create_file(st_class_member,
4505 &dev_attr_options);
4506 if (error) goto out;
4507
4508 if (mode == 0 && rew == 0) {
4509 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4510 &st_class_member->kobj,
4511 "tape");
4512 if (error) {
4513 printk(KERN_ERR
4514 "st%d: Can't create sysfs link from SCSI device.\n",
4515 dev_num);
4516 goto out;
4517 }
4518 }
4519 }
4520
4521 return 0;
4522
4523 out:
4524 return error;
4525 }
4526
4527 /* The following functions may be useful for a larger audience. */
4528 static int sgl_map_user_pages(struct st_buffer *STbp,
4529 const unsigned int max_pages, unsigned long uaddr,
4530 size_t count, int rw)
4531 {
4532 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4533 unsigned long start = uaddr >> PAGE_SHIFT;
4534 const int nr_pages = end - start;
4535 int res, i, j;
4536 struct page **pages;
4537 struct rq_map_data *mdata = &STbp->map_data;
4538
4539 /* User attempted Overflow! */
4540 if ((uaddr + count) < uaddr)
4541 return -EINVAL;
4542
4543 /* Too big */
4544 if (nr_pages > max_pages)
4545 return -ENOMEM;
4546
4547 /* Hmm? */
4548 if (count == 0)
4549 return 0;
4550
4551 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4552 return -ENOMEM;
4553
4554 /* Try to fault in all of the necessary pages */
4555 down_read(&current->mm->mmap_sem);
4556 /* rw==READ means read from drive, write into memory area */
4557 res = get_user_pages(
4558 current,
4559 current->mm,
4560 uaddr,
4561 nr_pages,
4562 rw == READ,
4563 0, /* don't force */
4564 pages,
4565 NULL);
4566 up_read(&current->mm->mmap_sem);
4567
4568 /* Errors and no page mapped should return here */
4569 if (res < nr_pages)
4570 goto out_unmap;
4571
4572 for (i=0; i < nr_pages; i++) {
4573 /* FIXME: flush superflous for rw==READ,
4574 * probably wrong function for rw==WRITE
4575 */
4576 flush_dcache_page(pages[i]);
4577 }
4578
4579 mdata->offset = uaddr & ~PAGE_MASK;
4580 mdata->page_order = 0;
4581 STbp->mapped_pages = pages;
4582
4583 return nr_pages;
4584 out_unmap:
4585 if (res > 0) {
4586 for (j=0; j < res; j++)
4587 page_cache_release(pages[j]);
4588 res = 0;
4589 }
4590 kfree(pages);
4591 return res;
4592 }
4593
4594
4595 /* And unmap them... */
4596 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4597 const unsigned int nr_pages, int dirtied)
4598 {
4599 int i;
4600
4601 for (i=0; i < nr_pages; i++) {
4602 struct page *page = STbp->mapped_pages[i];
4603
4604 if (dirtied)
4605 SetPageDirty(page);
4606 /* FIXME: cache flush missing for rw==READ
4607 * FIXME: call the correct reference counting function
4608 */
4609 page_cache_release(page);
4610 }
4611 kfree(STbp->mapped_pages);
4612 STbp->mapped_pages = NULL;
4613
4614 return 0;
4615 }
Support for the Chinese Samsung S3C2440 based development boards