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