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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/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}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
4 file Documentation/scsi/st.rst for more information.
5
6 History:
7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
8 Contribution and ideas from several people including (in alphabetical
9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
11 Michael Schaefer, J"org Weule, and Eric Youngdale.
12
13 Copyright 1992 - 2016 Kai Makisara
14 email Kai.Makisara@kolumbus.fi
15
16 Some small formal changes - aeb, 950809
17
18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
19 */
20
21static const char *verstr = "20160209";
22
23#include <linux/module.h>
24
25#include <linux/compat.h>
26#include <linux/fs.h>
27#include <linux/kernel.h>
28#include <linux/sched/signal.h>
29#include <linux/mm.h>
30#include <linux/init.h>
31#include <linux/string.h>
32#include <linux/slab.h>
33#include <linux/errno.h>
34#include <linux/mtio.h>
35#include <linux/major.h>
36#include <linux/cdrom.h>
37#include <linux/ioctl.h>
38#include <linux/fcntl.h>
39#include <linux/spinlock.h>
40#include <linux/blkdev.h>
41#include <linux/moduleparam.h>
42#include <linux/cdev.h>
43#include <linux/idr.h>
44#include <linux/delay.h>
45#include <linux/mutex.h>
46
47#include <linux/uaccess.h>
48#include <asm/dma.h>
49#include <linux/unaligned.h>
50
51#include <scsi/scsi.h>
52#include <scsi/scsi_dbg.h>
53#include <scsi/scsi_device.h>
54#include <scsi/scsi_driver.h>
55#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h>
58#include <scsi/sg.h>
59
60
61/* The driver prints some debugging information on the console if DEBUG
62 is defined and non-zero. */
63#define DEBUG 1
64#define NO_DEBUG 0
65
66#define ST_DEB_MSG KERN_NOTICE
67#if DEBUG
68/* The message level for the debug messages is currently set to KERN_NOTICE
69 so that people can easily see the messages. Later when the debugging messages
70 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
71#define DEB(a) a
72#define DEBC(a) if (debugging) { a ; }
73#else
74#define DEB(a)
75#define DEBC(a)
76#endif
77
78#define ST_KILOBYTE 1024
79
80#include "st_options.h"
81#include "st.h"
82
83static int buffer_kbs;
84static int max_sg_segs;
85static int try_direct_io = TRY_DIRECT_IO;
86static int try_rdio = 1;
87static int try_wdio = 1;
88static int debug_flag;
89
90static const struct class st_sysfs_class;
91static const struct attribute_group *st_dev_groups[];
92static const struct attribute_group *st_drv_groups[];
93
94MODULE_AUTHOR("Kai Makisara");
95MODULE_DESCRIPTION("SCSI tape (st) driver");
96MODULE_LICENSE("GPL");
97MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
98MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
99
100/* Set 'perm' (4th argument) to 0 to disable module_param's definition
101 * of sysfs parameters (which module_param doesn't yet support).
102 * Sysfs parameters defined explicitly later.
103 */
104module_param_named(buffer_kbs, buffer_kbs, int, 0);
105MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
106module_param_named(max_sg_segs, max_sg_segs, int, 0);
107MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
108module_param_named(try_direct_io, try_direct_io, int, 0);
109MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
110module_param_named(debug_flag, debug_flag, int, 0);
111MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
112
113
114/* Extra parameters for testing */
115module_param_named(try_rdio, try_rdio, int, 0);
116MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
117module_param_named(try_wdio, try_wdio, int, 0);
118MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
119
120#ifndef MODULE
121static int write_threshold_kbs; /* retained for compatibility */
122static struct st_dev_parm {
123 char *name;
124 int *val;
125} parms[] __initdata = {
126 {
127 "buffer_kbs", &buffer_kbs
128 },
129 { /* Retained for compatibility with 2.4 */
130 "write_threshold_kbs", &write_threshold_kbs
131 },
132 {
133 "max_sg_segs", NULL
134 },
135 {
136 "try_direct_io", &try_direct_io
137 },
138 {
139 "debug_flag", &debug_flag
140 }
141};
142#endif
143
144/* Restrict the number of modes so that names for all are assigned */
145#if ST_NBR_MODES > 16
146#error "Maximum number of modes is 16"
147#endif
148/* Bit reversed order to get same names for same minors with all
149 mode counts */
150static const char *st_formats[] = {
151 "", "r", "k", "s", "l", "t", "o", "u",
152 "m", "v", "p", "x", "a", "y", "q", "z"};
153
154/* The default definitions have been moved to st_options.h */
155
156#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
157
158/* The buffer size should fit into the 24 bits for length in the
159 6-byte SCSI read and write commands. */
160#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
161#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
162#endif
163
164static int debugging = DEBUG;
165
166#define MAX_RETRIES 0
167#define MAX_WRITE_RETRIES 0
168#define MAX_READY_RETRIES 0
169#define NO_TAPE NOT_READY
170
171#define ST_TIMEOUT (900 * HZ)
172#define ST_LONG_TIMEOUT (14000 * HZ)
173
174/* Remove mode bits and auto-rewind bit (7) */
175#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
176 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
177#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
178
179/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
180#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
181 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
182
183/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
184 24 bits) */
185#define SET_DENS_AND_BLK 0x10001
186
187static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
188static int st_max_sg_segs = ST_MAX_SG;
189
190static int modes_defined;
191
192static int enlarge_buffer(struct st_buffer *, int);
193static void clear_buffer(struct st_buffer *);
194static void normalize_buffer(struct st_buffer *);
195static int append_to_buffer(const char __user *, struct st_buffer *, int);
196static int from_buffer(struct st_buffer *, char __user *, int);
197static void move_buffer_data(struct st_buffer *, int);
198
199static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
200 unsigned long, size_t, int);
201static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
202
203static int st_probe(struct device *);
204static int st_remove(struct device *);
205
206static struct scsi_driver st_template = {
207 .gendrv = {
208 .name = "st",
209 .probe = st_probe,
210 .remove = st_remove,
211 .groups = st_drv_groups,
212 },
213};
214
215static int st_compression(struct scsi_tape *, int);
216
217static int find_partition(struct scsi_tape *);
218static int switch_partition(struct scsi_tape *);
219
220static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
221
222static void scsi_tape_release(struct kref *);
223
224#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
225
226static DEFINE_MUTEX(st_ref_mutex);
227static DEFINE_SPINLOCK(st_index_lock);
228static DEFINE_SPINLOCK(st_use_lock);
229static DEFINE_IDR(st_index_idr);
230
231
232
233#ifndef SIGS_FROM_OSST
234#define SIGS_FROM_OSST \
235 {"OnStream", "SC-", "", "osst"}, \
236 {"OnStream", "DI-", "", "osst"}, \
237 {"OnStream", "DP-", "", "osst"}, \
238 {"OnStream", "USB", "", "osst"}, \
239 {"OnStream", "FW-", "", "osst"}
240#endif
241
242static struct scsi_tape *scsi_tape_get(int dev)
243{
244 struct scsi_tape *STp = NULL;
245
246 mutex_lock(&st_ref_mutex);
247 spin_lock(&st_index_lock);
248
249 STp = idr_find(&st_index_idr, dev);
250 if (!STp) goto out;
251
252 kref_get(&STp->kref);
253
254 if (!STp->device)
255 goto out_put;
256
257 if (scsi_device_get(STp->device))
258 goto out_put;
259
260 goto out;
261
262out_put:
263 kref_put(&STp->kref, scsi_tape_release);
264 STp = NULL;
265out:
266 spin_unlock(&st_index_lock);
267 mutex_unlock(&st_ref_mutex);
268 return STp;
269}
270
271static void scsi_tape_put(struct scsi_tape *STp)
272{
273 struct scsi_device *sdev = STp->device;
274
275 mutex_lock(&st_ref_mutex);
276 kref_put(&STp->kref, scsi_tape_release);
277 scsi_device_put(sdev);
278 mutex_unlock(&st_ref_mutex);
279}
280
281struct st_reject_data {
282 char *vendor;
283 char *model;
284 char *rev;
285 char *driver_hint; /* Name of the correct driver, NULL if unknown */
286};
287
288static struct st_reject_data reject_list[] = {
289 /* {"XXX", "Yy-", "", NULL}, example */
290 SIGS_FROM_OSST,
291 {NULL, }};
292
293/* If the device signature is on the list of incompatible drives, the
294 function returns a pointer to the name of the correct driver (if known) */
295static char * st_incompatible(struct scsi_device* SDp)
296{
297 struct st_reject_data *rp;
298
299 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
300 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
301 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
302 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
303 if (rp->driver_hint)
304 return rp->driver_hint;
305 else
306 return "unknown";
307 }
308 return NULL;
309}
310
311
312#define st_printk(prefix, t, fmt, a...) \
313 sdev_prefix_printk(prefix, (t)->device, (t)->name, fmt, ##a)
314#ifdef DEBUG
315#define DEBC_printk(t, fmt, a...) \
316 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
317#else
318#define DEBC_printk(t, fmt, a...)
319#endif
320
321static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
322{
323 const u8 *ucp;
324 const u8 *sense = SRpnt->sense;
325
326 s->have_sense = scsi_normalize_sense(SRpnt->sense,
327 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
328 s->flags = 0;
329
330 if (s->have_sense) {
331 s->deferred = 0;
332 s->remainder_valid =
333 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
334 switch (sense[0] & 0x7f) {
335 case 0x71:
336 s->deferred = 1;
337 fallthrough;
338 case 0x70:
339 s->fixed_format = 1;
340 s->flags = sense[2] & 0xe0;
341 break;
342 case 0x73:
343 s->deferred = 1;
344 fallthrough;
345 case 0x72:
346 s->fixed_format = 0;
347 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
348 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
349 break;
350 }
351 }
352}
353
354
355/* Convert the result to success code */
356static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
357{
358 int result = SRpnt->result;
359 u8 scode;
360 DEB(const char *stp;)
361 char *name = STp->name;
362 struct st_cmdstatus *cmdstatp;
363
364 if (!result)
365 return 0;
366
367 cmdstatp = &STp->buffer->cmdstat;
368 st_analyze_sense(SRpnt, cmdstatp);
369
370 if (cmdstatp->have_sense)
371 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
372 else
373 scode = 0;
374
375 DEB(
376 if (debugging) {
377 st_printk(ST_DEB_MSG, STp,
378 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
379 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
380 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
381 if (cmdstatp->have_sense)
382 __scsi_print_sense(STp->device, name,
383 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
384 } ) /* end DEB */
385 if (!debugging) { /* Abnormal conditions for tape */
386 if (!cmdstatp->have_sense)
387 st_printk(KERN_WARNING, STp,
388 "Error %x (driver bt 0, host bt 0x%x).\n",
389 result, host_byte(result));
390 else if (cmdstatp->have_sense &&
391 scode != NO_SENSE &&
392 scode != RECOVERED_ERROR &&
393 /* scode != UNIT_ATTENTION && */
394 scode != BLANK_CHECK &&
395 scode != VOLUME_OVERFLOW &&
396 SRpnt->cmd[0] != MODE_SENSE &&
397 SRpnt->cmd[0] != TEST_UNIT_READY) {
398
399 __scsi_print_sense(STp->device, name,
400 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
401 }
402 }
403
404 if (cmdstatp->fixed_format &&
405 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
406 if (STp->cln_sense_value)
407 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
408 STp->cln_sense_mask) == STp->cln_sense_value);
409 else
410 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
411 STp->cln_sense_mask) != 0);
412 }
413 if (cmdstatp->have_sense &&
414 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
415 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
416 if (cmdstatp->have_sense && scode == UNIT_ATTENTION && cmdstatp->sense_hdr.asc == 0x29)
417 STp->pos_unknown = 1; /* ASC => power on / reset */
418
419 STp->pos_unknown |= STp->device->was_reset;
420
421 if (cmdstatp->have_sense &&
422 scode == RECOVERED_ERROR
423#if ST_RECOVERED_WRITE_FATAL
424 && SRpnt->cmd[0] != WRITE_6
425 && SRpnt->cmd[0] != WRITE_FILEMARKS
426#endif
427 ) {
428 STp->recover_count++;
429 STp->recover_reg++;
430
431 DEB(
432 if (debugging) {
433 if (SRpnt->cmd[0] == READ_6)
434 stp = "read";
435 else if (SRpnt->cmd[0] == WRITE_6)
436 stp = "write";
437 else
438 stp = "ioctl";
439 st_printk(ST_DEB_MSG, STp,
440 "Recovered %s error (%d).\n",
441 stp, STp->recover_count);
442 } ) /* end DEB */
443
444 if (cmdstatp->flags == 0)
445 return 0;
446 }
447 return (-EIO);
448}
449
450static struct st_request *st_allocate_request(struct scsi_tape *stp)
451{
452 struct st_request *streq;
453
454 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
455 if (streq)
456 streq->stp = stp;
457 else {
458 st_printk(KERN_ERR, stp,
459 "Can't get SCSI request.\n");
460 if (signal_pending(current))
461 stp->buffer->syscall_result = -EINTR;
462 else
463 stp->buffer->syscall_result = -EBUSY;
464 }
465
466 return streq;
467}
468
469static void st_release_request(struct st_request *streq)
470{
471 kfree(streq);
472}
473
474static void st_do_stats(struct scsi_tape *STp, struct request *req)
475{
476 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
477 ktime_t now;
478
479 now = ktime_get();
480 if (scmd->cmnd[0] == WRITE_6) {
481 now = ktime_sub(now, STp->stats->write_time);
482 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
484 atomic64_inc(&STp->stats->write_cnt);
485 if (scmd->result) {
486 atomic64_add(atomic_read(&STp->stats->last_write_size)
487 - STp->buffer->cmdstat.residual,
488 &STp->stats->write_byte_cnt);
489 if (STp->buffer->cmdstat.residual > 0)
490 atomic64_inc(&STp->stats->resid_cnt);
491 } else
492 atomic64_add(atomic_read(&STp->stats->last_write_size),
493 &STp->stats->write_byte_cnt);
494 } else if (scmd->cmnd[0] == READ_6) {
495 now = ktime_sub(now, STp->stats->read_time);
496 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
498 atomic64_inc(&STp->stats->read_cnt);
499 if (scmd->result) {
500 atomic64_add(atomic_read(&STp->stats->last_read_size)
501 - STp->buffer->cmdstat.residual,
502 &STp->stats->read_byte_cnt);
503 if (STp->buffer->cmdstat.residual > 0)
504 atomic64_inc(&STp->stats->resid_cnt);
505 } else
506 atomic64_add(atomic_read(&STp->stats->last_read_size),
507 &STp->stats->read_byte_cnt);
508 } else {
509 now = ktime_sub(now, STp->stats->other_time);
510 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
511 atomic64_inc(&STp->stats->other_cnt);
512 }
513 atomic64_dec(&STp->stats->in_flight);
514}
515
516static enum rq_end_io_ret st_scsi_execute_end(struct request *req,
517 blk_status_t status)
518{
519 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
520 struct st_request *SRpnt = req->end_io_data;
521 struct scsi_tape *STp = SRpnt->stp;
522 struct bio *tmp;
523
524 STp->buffer->cmdstat.midlevel_result = SRpnt->result = scmd->result;
525 STp->buffer->cmdstat.residual = scmd->resid_len;
526
527 st_do_stats(STp, req);
528
529 tmp = SRpnt->bio;
530 if (scmd->sense_len)
531 memcpy(SRpnt->sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
532 if (SRpnt->waiting)
533 complete(SRpnt->waiting);
534
535 blk_rq_unmap_user(tmp);
536 blk_mq_free_request(req);
537 return RQ_END_IO_NONE;
538}
539
540static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
541 int data_direction, void *buffer, unsigned bufflen,
542 int timeout, int retries)
543{
544 struct request *req;
545 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
546 int err = 0;
547 struct scsi_tape *STp = SRpnt->stp;
548 struct scsi_cmnd *scmd;
549
550 req = scsi_alloc_request(SRpnt->stp->device->request_queue,
551 data_direction == DMA_TO_DEVICE ?
552 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
553 if (IS_ERR(req))
554 return PTR_ERR(req);
555 scmd = blk_mq_rq_to_pdu(req);
556 req->rq_flags |= RQF_QUIET;
557
558 mdata->null_mapped = 1;
559
560 if (bufflen) {
561 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
562 GFP_KERNEL);
563 if (err) {
564 blk_mq_free_request(req);
565 return err;
566 }
567 }
568
569 atomic64_inc(&STp->stats->in_flight);
570 if (cmd[0] == WRITE_6) {
571 atomic_set(&STp->stats->last_write_size, bufflen);
572 STp->stats->write_time = ktime_get();
573 } else if (cmd[0] == READ_6) {
574 atomic_set(&STp->stats->last_read_size, bufflen);
575 STp->stats->read_time = ktime_get();
576 } else {
577 STp->stats->other_time = ktime_get();
578 }
579
580 SRpnt->bio = req->bio;
581 scmd->cmd_len = COMMAND_SIZE(cmd[0]);
582 memcpy(scmd->cmnd, cmd, scmd->cmd_len);
583 req->timeout = timeout;
584 scmd->allowed = retries;
585 req->end_io = st_scsi_execute_end;
586 req->end_io_data = SRpnt;
587
588 blk_execute_rq_nowait(req, true);
589 return 0;
590}
591
592/* Do the scsi command. Waits until command performed if do_wait is true.
593 Otherwise write_behind_check() is used to check that the command
594 has finished. */
595static struct st_request *
596st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
597 int bytes, int direction, int timeout, int retries, int do_wait)
598{
599 struct completion *waiting;
600 struct rq_map_data *mdata = &STp->buffer->map_data;
601 int ret;
602
603 /* if async, make sure there's no command outstanding */
604 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
605 st_printk(KERN_ERR, STp,
606 "Async command already active.\n");
607 if (signal_pending(current))
608 (STp->buffer)->syscall_result = (-EINTR);
609 else
610 (STp->buffer)->syscall_result = (-EBUSY);
611 return NULL;
612 }
613
614 if (!SRpnt) {
615 SRpnt = st_allocate_request(STp);
616 if (!SRpnt)
617 return NULL;
618 }
619
620 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
621 which IO is outstanding. It's nulled out when the IO completes. */
622 if (!do_wait)
623 (STp->buffer)->last_SRpnt = SRpnt;
624
625 waiting = &STp->wait;
626 init_completion(waiting);
627 SRpnt->waiting = waiting;
628
629 if (STp->buffer->do_dio) {
630 mdata->page_order = 0;
631 mdata->nr_entries = STp->buffer->sg_segs;
632 mdata->pages = STp->buffer->mapped_pages;
633 } else {
634 mdata->page_order = STp->buffer->reserved_page_order;
635 mdata->nr_entries =
636 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
637 mdata->pages = STp->buffer->reserved_pages;
638 mdata->offset = 0;
639 }
640
641 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
642 STp->buffer->cmdstat.have_sense = 0;
643 STp->buffer->syscall_result = 0;
644
645 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
646 retries);
647 if (ret) {
648 /* could not allocate the buffer or request was too large */
649 (STp->buffer)->syscall_result = (-EBUSY);
650 (STp->buffer)->last_SRpnt = NULL;
651 } else if (do_wait) {
652 wait_for_completion(waiting);
653 SRpnt->waiting = NULL;
654 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
655 }
656
657 return SRpnt;
658}
659
660
661/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
662 write has been correct but EOM early warning reached, -EIO if write ended in
663 error or zero if write successful. Asynchronous writes are used only in
664 variable block mode. */
665static int write_behind_check(struct scsi_tape * STp)
666{
667 int retval = 0;
668 struct st_buffer *STbuffer;
669 struct st_partstat *STps;
670 struct st_cmdstatus *cmdstatp;
671 struct st_request *SRpnt;
672
673 STbuffer = STp->buffer;
674 if (!STbuffer->writing)
675 return 0;
676
677 DEB(
678 if (STp->write_pending)
679 STp->nbr_waits++;
680 else
681 STp->nbr_finished++;
682 ) /* end DEB */
683
684 wait_for_completion(&(STp->wait));
685 SRpnt = STbuffer->last_SRpnt;
686 STbuffer->last_SRpnt = NULL;
687 SRpnt->waiting = NULL;
688
689 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
690 st_release_request(SRpnt);
691
692 STbuffer->buffer_bytes -= STbuffer->writing;
693 STps = &(STp->ps[STp->partition]);
694 if (STps->drv_block >= 0) {
695 if (STp->block_size == 0)
696 STps->drv_block++;
697 else
698 STps->drv_block += STbuffer->writing / STp->block_size;
699 }
700
701 cmdstatp = &STbuffer->cmdstat;
702 if (STbuffer->syscall_result) {
703 retval = -EIO;
704 if (cmdstatp->have_sense && !cmdstatp->deferred &&
705 (cmdstatp->flags & SENSE_EOM) &&
706 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
707 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
708 /* EOM at write-behind, has all data been written? */
709 if (!cmdstatp->remainder_valid ||
710 cmdstatp->uremainder64 == 0)
711 retval = -ENOSPC;
712 }
713 if (retval == -EIO)
714 STps->drv_block = -1;
715 }
716 STbuffer->writing = 0;
717
718 DEB(if (debugging && retval)
719 st_printk(ST_DEB_MSG, STp,
720 "Async write error %x, return value %d.\n",
721 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
722
723 return retval;
724}
725
726
727/* Step over EOF if it has been inadvertently crossed (ioctl not used because
728 it messes up the block number). */
729static int cross_eof(struct scsi_tape * STp, int forward)
730{
731 struct st_request *SRpnt;
732 unsigned char cmd[MAX_COMMAND_SIZE];
733
734 cmd[0] = SPACE;
735 cmd[1] = 0x01; /* Space FileMarks */
736 if (forward) {
737 cmd[2] = cmd[3] = 0;
738 cmd[4] = 1;
739 } else
740 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
741 cmd[5] = 0;
742
743 DEBC_printk(STp, "Stepping over filemark %s.\n",
744 forward ? "forward" : "backward");
745
746 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
747 STp->device->request_queue->rq_timeout,
748 MAX_RETRIES, 1);
749 if (!SRpnt)
750 return (STp->buffer)->syscall_result;
751
752 st_release_request(SRpnt);
753 SRpnt = NULL;
754
755 if ((STp->buffer)->cmdstat.midlevel_result != 0)
756 st_printk(KERN_ERR, STp,
757 "Stepping over filemark %s failed.\n",
758 forward ? "forward" : "backward");
759
760 return (STp->buffer)->syscall_result;
761}
762
763
764/* Flush the write buffer (never need to write if variable blocksize). */
765static int st_flush_write_buffer(struct scsi_tape * STp)
766{
767 int transfer, blks;
768 int result;
769 unsigned char cmd[MAX_COMMAND_SIZE];
770 struct st_request *SRpnt;
771 struct st_partstat *STps;
772
773 result = write_behind_check(STp);
774 if (result)
775 return result;
776
777 result = 0;
778 if (STp->dirty == 1) {
779
780 transfer = STp->buffer->buffer_bytes;
781 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
782
783 memset(cmd, 0, MAX_COMMAND_SIZE);
784 cmd[0] = WRITE_6;
785 cmd[1] = 1;
786 blks = transfer / STp->block_size;
787 cmd[2] = blks >> 16;
788 cmd[3] = blks >> 8;
789 cmd[4] = blks;
790
791 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
792 STp->device->request_queue->rq_timeout,
793 MAX_WRITE_RETRIES, 1);
794 if (!SRpnt)
795 return (STp->buffer)->syscall_result;
796
797 STps = &(STp->ps[STp->partition]);
798 if ((STp->buffer)->syscall_result != 0) {
799 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
800
801 if (cmdstatp->have_sense && !cmdstatp->deferred &&
802 (cmdstatp->flags & SENSE_EOM) &&
803 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
804 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
805 (!cmdstatp->remainder_valid ||
806 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
807 STp->dirty = 0;
808 (STp->buffer)->buffer_bytes = 0;
809 if (STps->drv_block >= 0)
810 STps->drv_block += blks;
811 result = (-ENOSPC);
812 } else {
813 st_printk(KERN_ERR, STp, "Error on flush.\n");
814 STps->drv_block = (-1);
815 result = (-EIO);
816 }
817 } else {
818 if (STps->drv_block >= 0)
819 STps->drv_block += blks;
820 STp->dirty = 0;
821 (STp->buffer)->buffer_bytes = 0;
822 }
823 st_release_request(SRpnt);
824 SRpnt = NULL;
825 }
826 return result;
827}
828
829
830/* Flush the tape buffer. The tape will be positioned correctly unless
831 seek_next is true. */
832static int flush_buffer(struct scsi_tape *STp, int seek_next)
833{
834 int backspace, result;
835 struct st_partstat *STps;
836
837 if (STp->ready != ST_READY)
838 return 0;
839
840 /*
841 * If there was a bus reset, block further access
842 * to this device.
843 */
844 if (STp->pos_unknown)
845 return (-EIO);
846
847 STps = &(STp->ps[STp->partition]);
848 if (STps->rw == ST_WRITING) /* Writing */
849 return st_flush_write_buffer(STp);
850
851 if (STp->block_size == 0)
852 return 0;
853
854 backspace = ((STp->buffer)->buffer_bytes +
855 (STp->buffer)->read_pointer) / STp->block_size -
856 ((STp->buffer)->read_pointer + STp->block_size - 1) /
857 STp->block_size;
858 (STp->buffer)->buffer_bytes = 0;
859 (STp->buffer)->read_pointer = 0;
860 result = 0;
861 if (!seek_next) {
862 if (STps->eof == ST_FM_HIT) {
863 result = cross_eof(STp, 0); /* Back over the EOF hit */
864 if (!result)
865 STps->eof = ST_NOEOF;
866 else {
867 if (STps->drv_file >= 0)
868 STps->drv_file++;
869 STps->drv_block = 0;
870 }
871 }
872 if (!result && backspace > 0)
873 result = st_int_ioctl(STp, MTBSR, backspace);
874 } else if (STps->eof == ST_FM_HIT) {
875 if (STps->drv_file >= 0)
876 STps->drv_file++;
877 STps->drv_block = 0;
878 STps->eof = ST_NOEOF;
879 }
880 return result;
881
882}
883
884/* Set the mode parameters */
885static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
886{
887 int set_it = 0;
888 unsigned long arg;
889
890 if (!STp->density_changed &&
891 STm->default_density >= 0 &&
892 STm->default_density != STp->density) {
893 arg = STm->default_density;
894 set_it = 1;
895 } else
896 arg = STp->density;
897 arg <<= MT_ST_DENSITY_SHIFT;
898 if (!STp->blksize_changed &&
899 STm->default_blksize >= 0 &&
900 STm->default_blksize != STp->block_size) {
901 arg |= STm->default_blksize;
902 set_it = 1;
903 } else
904 arg |= STp->block_size;
905 if (set_it &&
906 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
907 st_printk(KERN_WARNING, STp,
908 "Can't set default block size to %d bytes "
909 "and density %x.\n",
910 STm->default_blksize, STm->default_density);
911 if (modes_defined)
912 return (-EINVAL);
913 }
914 return 0;
915}
916
917
918/* Lock or unlock the drive door. Don't use when st_request allocated. */
919static int do_door_lock(struct scsi_tape * STp, int do_lock)
920{
921 int retval;
922
923 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
924
925 retval = scsi_set_medium_removal(STp->device,
926 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
927 if (!retval)
928 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
929 else
930 STp->door_locked = ST_LOCK_FAILS;
931 return retval;
932}
933
934
935/* Set the internal state after reset */
936static void reset_state(struct scsi_tape *STp)
937{
938 int i;
939 struct st_partstat *STps;
940
941 STp->pos_unknown = 0;
942 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
943 STps = &(STp->ps[i]);
944 STps->rw = ST_IDLE;
945 STps->eof = ST_NOEOF;
946 STps->at_sm = 0;
947 STps->last_block_valid = 0;
948 STps->drv_block = -1;
949 STps->drv_file = -1;
950 }
951 if (STp->can_partitions) {
952 STp->partition = find_partition(STp);
953 if (STp->partition < 0)
954 STp->partition = 0;
955 STp->new_partition = STp->partition;
956 }
957}
958
959/* Test if the drive is ready. Returns either one of the codes below or a negative system
960 error code. */
961#define CHKRES_READY 0
962#define CHKRES_NEW_SESSION 1
963#define CHKRES_NOT_READY 2
964#define CHKRES_NO_TAPE 3
965
966#define MAX_ATTENTIONS 10
967
968static int test_ready(struct scsi_tape *STp, int do_wait)
969{
970 int attentions, waits, max_wait, scode;
971 int retval = CHKRES_READY, new_session = 0;
972 unsigned char cmd[MAX_COMMAND_SIZE];
973 struct st_request *SRpnt = NULL;
974 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
975
976 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
977
978 for (attentions=waits=0; ; ) {
979 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
980 cmd[0] = TEST_UNIT_READY;
981 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
982 STp->long_timeout, MAX_READY_RETRIES, 1);
983
984 if (!SRpnt) {
985 retval = (STp->buffer)->syscall_result;
986 break;
987 }
988
989 if (cmdstatp->have_sense) {
990
991 scode = cmdstatp->sense_hdr.sense_key;
992
993 if (scode == UNIT_ATTENTION) { /* New media? */
994 if (cmdstatp->sense_hdr.asc == 0x28) { /* New media */
995 new_session = 1;
996 DEBC_printk(STp, "New tape session.");
997 }
998 if (attentions < MAX_ATTENTIONS) {
999 attentions++;
1000 continue;
1001 }
1002 else {
1003 retval = (-EIO);
1004 break;
1005 }
1006 }
1007
1008 if (scode == NOT_READY) {
1009 if (waits < max_wait) {
1010 if (msleep_interruptible(1000)) {
1011 retval = (-EINTR);
1012 break;
1013 }
1014 waits++;
1015 continue;
1016 }
1017 else {
1018 if ((STp->device)->scsi_level >= SCSI_2 &&
1019 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1020 retval = CHKRES_NO_TAPE;
1021 else
1022 retval = CHKRES_NOT_READY;
1023 break;
1024 }
1025 }
1026 }
1027
1028 retval = (STp->buffer)->syscall_result;
1029 if (!retval)
1030 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1031 break;
1032 }
1033 if (STp->first_tur) {
1034 /* Don't set pos_unknown right after device recognition */
1035 STp->pos_unknown = 0;
1036 STp->first_tur = 0;
1037 }
1038
1039 if (SRpnt != NULL)
1040 st_release_request(SRpnt);
1041 return retval;
1042}
1043
1044
1045/* See if the drive is ready and gather information about the tape. Return values:
1046 < 0 negative error code from errno.h
1047 0 drive ready
1048 1 drive not ready (possibly no tape)
1049*/
1050static int check_tape(struct scsi_tape *STp, struct file *filp)
1051{
1052 int i, retval, new_session = 0, do_wait;
1053 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1054 unsigned short st_flags = filp->f_flags;
1055 struct st_request *SRpnt = NULL;
1056 struct st_modedef *STm;
1057 struct st_partstat *STps;
1058 struct inode *inode = file_inode(filp);
1059 int mode = TAPE_MODE(inode);
1060
1061 STp->ready = ST_READY;
1062
1063 if (mode != STp->current_mode) {
1064 DEBC_printk(STp, "Mode change from %d to %d.\n",
1065 STp->current_mode, mode);
1066 new_session = 1;
1067 STp->current_mode = mode;
1068 }
1069 STm = &(STp->modes[STp->current_mode]);
1070
1071 saved_cleaning = STp->cleaning_req;
1072 STp->cleaning_req = 0;
1073
1074 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1075 retval = test_ready(STp, do_wait);
1076
1077 if (retval < 0)
1078 goto err_out;
1079
1080 if (retval == CHKRES_NEW_SESSION) {
1081 STp->pos_unknown = 0;
1082 STp->partition = STp->new_partition = 0;
1083 if (STp->can_partitions)
1084 STp->nbr_partitions = 1; /* This guess will be updated later
1085 if necessary */
1086 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1087 STps = &(STp->ps[i]);
1088 STps->rw = ST_IDLE;
1089 STps->eof = ST_NOEOF;
1090 STps->at_sm = 0;
1091 STps->last_block_valid = 0;
1092 STps->drv_block = 0;
1093 STps->drv_file = 0;
1094 }
1095 new_session = 1;
1096 }
1097 else {
1098 STp->cleaning_req |= saved_cleaning;
1099
1100 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1101 if (retval == CHKRES_NO_TAPE)
1102 STp->ready = ST_NO_TAPE;
1103 else
1104 STp->ready = ST_NOT_READY;
1105
1106 STp->density = 0; /* Clear the erroneous "residue" */
1107 STp->write_prot = 0;
1108 STp->block_size = 0;
1109 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1110 STp->partition = STp->new_partition = 0;
1111 STp->door_locked = ST_UNLOCKED;
1112 return CHKRES_NOT_READY;
1113 }
1114 }
1115
1116 if (STp->omit_blklims)
1117 STp->min_block = STp->max_block = (-1);
1118 else {
1119 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1120 cmd[0] = READ_BLOCK_LIMITS;
1121
1122 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1123 STp->device->request_queue->rq_timeout,
1124 MAX_READY_RETRIES, 1);
1125 if (!SRpnt) {
1126 retval = (STp->buffer)->syscall_result;
1127 goto err_out;
1128 }
1129
1130 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1131 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1132 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1133 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1134 (STp->buffer)->b_data[5];
1135 if ( DEB( debugging || ) !STp->inited)
1136 st_printk(KERN_INFO, STp,
1137 "Block limits %d - %d bytes.\n",
1138 STp->min_block, STp->max_block);
1139 } else {
1140 STp->min_block = STp->max_block = (-1);
1141 DEBC_printk(STp, "Can't read block limits.\n");
1142 }
1143 }
1144
1145 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1146 cmd[0] = MODE_SENSE;
1147 cmd[4] = 12;
1148
1149 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1150 STp->device->request_queue->rq_timeout,
1151 MAX_READY_RETRIES, 1);
1152 if (!SRpnt) {
1153 retval = (STp->buffer)->syscall_result;
1154 goto err_out;
1155 }
1156
1157 if ((STp->buffer)->syscall_result != 0) {
1158 DEBC_printk(STp, "No Mode Sense.\n");
1159 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1160 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1161 STp->drv_write_prot = 0;
1162 } else {
1163 DEBC_printk(STp,"Mode sense. Length %d, "
1164 "medium %x, WBS %x, BLL %d\n",
1165 (STp->buffer)->b_data[0],
1166 (STp->buffer)->b_data[1],
1167 (STp->buffer)->b_data[2],
1168 (STp->buffer)->b_data[3]);
1169
1170 if ((STp->buffer)->b_data[3] >= 8) {
1171 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1172 STp->density = (STp->buffer)->b_data[4];
1173 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1174 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1175 DEBC_printk(STp, "Density %x, tape length: %x, "
1176 "drv buffer: %d\n",
1177 STp->density,
1178 (STp->buffer)->b_data[5] * 65536 +
1179 (STp->buffer)->b_data[6] * 256 +
1180 (STp->buffer)->b_data[7],
1181 STp->drv_buffer);
1182 }
1183 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1184 if (!STp->drv_buffer && STp->immediate_filemark) {
1185 st_printk(KERN_WARNING, STp,
1186 "non-buffered tape: disabling "
1187 "writing immediate filemarks\n");
1188 STp->immediate_filemark = 0;
1189 }
1190 }
1191 st_release_request(SRpnt);
1192 SRpnt = NULL;
1193 STp->inited = 1;
1194
1195 if (STp->block_size > 0)
1196 (STp->buffer)->buffer_blocks =
1197 (STp->buffer)->buffer_size / STp->block_size;
1198 else
1199 (STp->buffer)->buffer_blocks = 1;
1200 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1201
1202 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1203 STp->block_size, (STp->buffer)->buffer_size,
1204 (STp->buffer)->buffer_blocks);
1205
1206 if (STp->drv_write_prot) {
1207 STp->write_prot = 1;
1208
1209 DEBC_printk(STp, "Write protected\n");
1210
1211 if (do_wait &&
1212 ((st_flags & O_ACCMODE) == O_WRONLY ||
1213 (st_flags & O_ACCMODE) == O_RDWR)) {
1214 retval = (-EROFS);
1215 goto err_out;
1216 }
1217 }
1218
1219 if (STp->can_partitions && STp->nbr_partitions < 1) {
1220 /* This code is reached when the device is opened for the first time
1221 after the driver has been initialized with tape in the drive and the
1222 partition support has been enabled. */
1223 DEBC_printk(STp, "Updating partition number in status.\n");
1224 if ((STp->partition = find_partition(STp)) < 0) {
1225 retval = STp->partition;
1226 goto err_out;
1227 }
1228 STp->new_partition = STp->partition;
1229 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1230 }
1231
1232 if (new_session) { /* Change the drive parameters for the new mode */
1233 STp->density_changed = STp->blksize_changed = 0;
1234 STp->compression_changed = 0;
1235 if (!(STm->defaults_for_writes) &&
1236 (retval = set_mode_densblk(STp, STm)) < 0)
1237 goto err_out;
1238
1239 if (STp->default_drvbuffer != 0xff) {
1240 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1241 st_printk(KERN_WARNING, STp,
1242 "Can't set default drive "
1243 "buffering to %d.\n",
1244 STp->default_drvbuffer);
1245 }
1246 }
1247
1248 return CHKRES_READY;
1249
1250 err_out:
1251 return retval;
1252}
1253
1254
1255 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1256 module count. */
1257static int st_open(struct inode *inode, struct file *filp)
1258{
1259 int i, retval = (-EIO);
1260 int resumed = 0;
1261 struct scsi_tape *STp;
1262 struct st_partstat *STps;
1263 int dev = TAPE_NR(inode);
1264
1265 /*
1266 * We really want to do nonseekable_open(inode, filp); here, but some
1267 * versions of tar incorrectly call lseek on tapes and bail out if that
1268 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1269 */
1270 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1271
1272 if (!(STp = scsi_tape_get(dev))) {
1273 return -ENXIO;
1274 }
1275
1276 filp->private_data = STp;
1277
1278 spin_lock(&st_use_lock);
1279 if (STp->in_use) {
1280 spin_unlock(&st_use_lock);
1281 DEBC_printk(STp, "Device already in use.\n");
1282 scsi_tape_put(STp);
1283 return (-EBUSY);
1284 }
1285
1286 STp->in_use = 1;
1287 spin_unlock(&st_use_lock);
1288 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1289
1290 if (scsi_autopm_get_device(STp->device) < 0) {
1291 retval = -EIO;
1292 goto err_out;
1293 }
1294 resumed = 1;
1295 if (!scsi_block_when_processing_errors(STp->device)) {
1296 retval = (-ENXIO);
1297 goto err_out;
1298 }
1299
1300 /* See that we have at least a one page buffer available */
1301 if (!enlarge_buffer(STp->buffer, PAGE_SIZE)) {
1302 st_printk(KERN_WARNING, STp,
1303 "Can't allocate one page tape buffer.\n");
1304 retval = (-EOVERFLOW);
1305 goto err_out;
1306 }
1307
1308 (STp->buffer)->cleared = 0;
1309 (STp->buffer)->writing = 0;
1310 (STp->buffer)->syscall_result = 0;
1311
1312 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1313
1314 STp->dirty = 0;
1315 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1316 STps = &(STp->ps[i]);
1317 STps->rw = ST_IDLE;
1318 }
1319 STp->try_dio_now = STp->try_dio;
1320 STp->recover_count = 0;
1321 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1322 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1323
1324 retval = check_tape(STp, filp);
1325 if (retval < 0)
1326 goto err_out;
1327 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1328 retval != CHKRES_READY) {
1329 if (STp->ready == NO_TAPE)
1330 retval = (-ENOMEDIUM);
1331 else
1332 retval = (-EIO);
1333 goto err_out;
1334 }
1335 return 0;
1336
1337 err_out:
1338 normalize_buffer(STp->buffer);
1339 spin_lock(&st_use_lock);
1340 STp->in_use = 0;
1341 spin_unlock(&st_use_lock);
1342 if (resumed)
1343 scsi_autopm_put_device(STp->device);
1344 scsi_tape_put(STp);
1345 return retval;
1346
1347}
1348
1349
1350/* Flush the tape buffer before close */
1351static int st_flush(struct file *filp, fl_owner_t id)
1352{
1353 int result = 0, result2;
1354 unsigned char cmd[MAX_COMMAND_SIZE];
1355 struct st_request *SRpnt;
1356 struct scsi_tape *STp = filp->private_data;
1357 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1358 struct st_partstat *STps = &(STp->ps[STp->partition]);
1359
1360 if (file_count(filp) > 1)
1361 return 0;
1362
1363 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1364 result = st_flush_write_buffer(STp);
1365 if (result != 0 && result != (-ENOSPC))
1366 goto out;
1367 }
1368
1369 if (STp->can_partitions &&
1370 (result2 = switch_partition(STp)) < 0) {
1371 DEBC_printk(STp, "switch_partition at close failed.\n");
1372 if (result == 0)
1373 result = result2;
1374 goto out;
1375 }
1376
1377 DEBC( if (STp->nbr_requests)
1378 st_printk(KERN_DEBUG, STp,
1379 "Number of r/w requests %d, dio used in %d, "
1380 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1381 STp->nbr_pages));
1382
1383 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1384 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1385
1386#if DEBUG
1387 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1388 STp->nbr_waits, STp->nbr_finished);
1389#endif
1390 memset(cmd, 0, MAX_COMMAND_SIZE);
1391 cmd[0] = WRITE_FILEMARKS;
1392 if (STp->immediate_filemark)
1393 cmd[1] = 1;
1394 cmd[4] = 1 + STp->two_fm;
1395
1396 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1397 STp->device->request_queue->rq_timeout,
1398 MAX_WRITE_RETRIES, 1);
1399 if (!SRpnt) {
1400 result = (STp->buffer)->syscall_result;
1401 goto out;
1402 }
1403
1404 if (STp->buffer->syscall_result == 0 ||
1405 (cmdstatp->have_sense && !cmdstatp->deferred &&
1406 (cmdstatp->flags & SENSE_EOM) &&
1407 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1408 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1409 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1410 /* Write successful at EOM */
1411 st_release_request(SRpnt);
1412 SRpnt = NULL;
1413 if (STps->drv_file >= 0)
1414 STps->drv_file++;
1415 STps->drv_block = 0;
1416 if (STp->two_fm)
1417 cross_eof(STp, 0);
1418 STps->eof = ST_FM;
1419 }
1420 else { /* Write error */
1421 st_release_request(SRpnt);
1422 SRpnt = NULL;
1423 st_printk(KERN_ERR, STp,
1424 "Error on write filemark.\n");
1425 if (result == 0)
1426 result = (-EIO);
1427 }
1428
1429 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1430 } else if (!STp->rew_at_close) {
1431 STps = &(STp->ps[STp->partition]);
1432 if (!STm->sysv || STps->rw != ST_READING) {
1433 if (STp->can_bsr)
1434 result = flush_buffer(STp, 0);
1435 else if (STps->eof == ST_FM_HIT) {
1436 result = cross_eof(STp, 0);
1437 if (result) {
1438 if (STps->drv_file >= 0)
1439 STps->drv_file++;
1440 STps->drv_block = 0;
1441 STps->eof = ST_FM;
1442 } else
1443 STps->eof = ST_NOEOF;
1444 }
1445 } else if ((STps->eof == ST_NOEOF &&
1446 !(result = cross_eof(STp, 1))) ||
1447 STps->eof == ST_FM_HIT) {
1448 if (STps->drv_file >= 0)
1449 STps->drv_file++;
1450 STps->drv_block = 0;
1451 STps->eof = ST_FM;
1452 }
1453 }
1454
1455 out:
1456 if (STp->rew_at_close) {
1457 result2 = st_int_ioctl(STp, MTREW, 1);
1458 if (result == 0)
1459 result = result2;
1460 }
1461 return result;
1462}
1463
1464
1465/* Close the device and release it. BKL is not needed: this is the only thread
1466 accessing this tape. */
1467static int st_release(struct inode *inode, struct file *filp)
1468{
1469 struct scsi_tape *STp = filp->private_data;
1470
1471 if (STp->door_locked == ST_LOCKED_AUTO)
1472 do_door_lock(STp, 0);
1473
1474 normalize_buffer(STp->buffer);
1475 spin_lock(&st_use_lock);
1476 STp->in_use = 0;
1477 spin_unlock(&st_use_lock);
1478 scsi_autopm_put_device(STp->device);
1479 scsi_tape_put(STp);
1480
1481 return 0;
1482}
1483
1484/* The checks common to both reading and writing */
1485static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1486{
1487 ssize_t retval = 0;
1488
1489 /*
1490 * If we are in the middle of error recovery, don't let anyone
1491 * else try and use this device. Also, if error recovery fails, it
1492 * may try and take the device offline, in which case all further
1493 * access to the device is prohibited.
1494 */
1495 if (!scsi_block_when_processing_errors(STp->device)) {
1496 retval = (-ENXIO);
1497 goto out;
1498 }
1499
1500 if (STp->ready != ST_READY) {
1501 if (STp->ready == ST_NO_TAPE)
1502 retval = (-ENOMEDIUM);
1503 else
1504 retval = (-EIO);
1505 goto out;
1506 }
1507
1508 if (! STp->modes[STp->current_mode].defined) {
1509 retval = (-ENXIO);
1510 goto out;
1511 }
1512
1513
1514 /*
1515 * If there was a bus reset, block further access
1516 * to this device.
1517 */
1518 if (STp->pos_unknown) {
1519 retval = (-EIO);
1520 goto out;
1521 }
1522
1523 if (count == 0)
1524 goto out;
1525
1526 DEB(
1527 if (!STp->in_use) {
1528 st_printk(ST_DEB_MSG, STp,
1529 "Incorrect device.\n");
1530 retval = (-EIO);
1531 goto out;
1532 } ) /* end DEB */
1533
1534 if (STp->can_partitions &&
1535 (retval = switch_partition(STp)) < 0)
1536 goto out;
1537
1538 if (STp->block_size == 0 && STp->max_block > 0 &&
1539 (count < STp->min_block || count > STp->max_block)) {
1540 retval = (-EINVAL);
1541 goto out;
1542 }
1543
1544 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1545 !do_door_lock(STp, 1))
1546 STp->door_locked = ST_LOCKED_AUTO;
1547
1548 out:
1549 return retval;
1550}
1551
1552
1553static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1554 size_t count, int is_read)
1555{
1556 int i, bufsize, retval = 0;
1557 struct st_buffer *STbp = STp->buffer;
1558
1559 if (is_read)
1560 i = STp->try_dio_now && try_rdio;
1561 else
1562 i = STp->try_dio_now && try_wdio;
1563
1564 if (i && ((unsigned long)buf & queue_dma_alignment(
1565 STp->device->request_queue)) == 0) {
1566 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1567 count, (is_read ? READ : WRITE));
1568 if (i > 0) {
1569 STbp->do_dio = i;
1570 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1571 }
1572 else
1573 STbp->do_dio = 0; /* fall back to buffering with any error */
1574 STbp->sg_segs = STbp->do_dio;
1575 DEB(
1576 if (STbp->do_dio) {
1577 STp->nbr_dio++;
1578 STp->nbr_pages += STbp->do_dio;
1579 }
1580 )
1581 } else
1582 STbp->do_dio = 0;
1583 DEB( STp->nbr_requests++; )
1584
1585 if (!STbp->do_dio) {
1586 if (STp->block_size)
1587 bufsize = STp->block_size > st_fixed_buffer_size ?
1588 STp->block_size : st_fixed_buffer_size;
1589 else {
1590 bufsize = count;
1591 /* Make sure that data from previous user is not leaked even if
1592 HBA does not return correct residual */
1593 if (is_read && STp->sili && !STbp->cleared)
1594 clear_buffer(STbp);
1595 }
1596
1597 if (bufsize > STbp->buffer_size &&
1598 !enlarge_buffer(STbp, bufsize)) {
1599 st_printk(KERN_WARNING, STp,
1600 "Can't allocate %d byte tape buffer.\n",
1601 bufsize);
1602 retval = (-EOVERFLOW);
1603 goto out;
1604 }
1605 if (STp->block_size)
1606 STbp->buffer_blocks = bufsize / STp->block_size;
1607 }
1608
1609 out:
1610 return retval;
1611}
1612
1613
1614/* Can be called more than once after each setup_buffer() */
1615static void release_buffering(struct scsi_tape *STp, int is_read)
1616{
1617 struct st_buffer *STbp;
1618
1619 STbp = STp->buffer;
1620 if (STbp->do_dio) {
1621 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1622 STbp->do_dio = 0;
1623 STbp->sg_segs = 0;
1624 }
1625}
1626
1627
1628/* Write command */
1629static ssize_t
1630st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1631{
1632 ssize_t total;
1633 ssize_t i, do_count, blks, transfer;
1634 ssize_t retval;
1635 int undone, retry_eot = 0, scode;
1636 int async_write;
1637 unsigned char cmd[MAX_COMMAND_SIZE];
1638 const char __user *b_point;
1639 struct st_request *SRpnt = NULL;
1640 struct scsi_tape *STp = filp->private_data;
1641 struct st_modedef *STm;
1642 struct st_partstat *STps;
1643 struct st_buffer *STbp;
1644
1645 if (mutex_lock_interruptible(&STp->lock))
1646 return -ERESTARTSYS;
1647
1648 retval = rw_checks(STp, filp, count);
1649 if (retval || count == 0)
1650 goto out;
1651
1652 /* Write must be integral number of blocks */
1653 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1654 st_printk(KERN_WARNING, STp,
1655 "Write not multiple of tape block size.\n");
1656 retval = (-EINVAL);
1657 goto out;
1658 }
1659
1660 STm = &(STp->modes[STp->current_mode]);
1661 STps = &(STp->ps[STp->partition]);
1662
1663 if (STp->write_prot) {
1664 retval = (-EACCES);
1665 goto out;
1666 }
1667
1668
1669 if (STps->rw == ST_READING) {
1670 retval = flush_buffer(STp, 0);
1671 if (retval)
1672 goto out;
1673 STps->rw = ST_WRITING;
1674 } else if (STps->rw != ST_WRITING &&
1675 STps->drv_file == 0 && STps->drv_block == 0) {
1676 if ((retval = set_mode_densblk(STp, STm)) < 0)
1677 goto out;
1678 if (STm->default_compression != ST_DONT_TOUCH &&
1679 !(STp->compression_changed)) {
1680 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1681 st_printk(KERN_WARNING, STp,
1682 "Can't set default compression.\n");
1683 if (modes_defined) {
1684 retval = (-EINVAL);
1685 goto out;
1686 }
1687 }
1688 }
1689 }
1690
1691 STbp = STp->buffer;
1692 i = write_behind_check(STp);
1693 if (i) {
1694 if (i == -ENOSPC)
1695 STps->eof = ST_EOM_OK;
1696 else
1697 STps->eof = ST_EOM_ERROR;
1698 }
1699
1700 if (STps->eof == ST_EOM_OK) {
1701 STps->eof = ST_EOD_1; /* allow next write */
1702 retval = (-ENOSPC);
1703 goto out;
1704 }
1705 else if (STps->eof == ST_EOM_ERROR) {
1706 retval = (-EIO);
1707 goto out;
1708 }
1709
1710 /* Check the buffer readability in cases where copy_user might catch
1711 the problems after some tape movement. */
1712 if (STp->block_size != 0 &&
1713 !STbp->do_dio &&
1714 (copy_from_user(&i, buf, 1) != 0 ||
1715 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1716 retval = (-EFAULT);
1717 goto out;
1718 }
1719
1720 retval = setup_buffering(STp, buf, count, 0);
1721 if (retval)
1722 goto out;
1723
1724 total = count;
1725
1726 memset(cmd, 0, MAX_COMMAND_SIZE);
1727 cmd[0] = WRITE_6;
1728 cmd[1] = (STp->block_size != 0);
1729
1730 STps->rw = ST_WRITING;
1731
1732 b_point = buf;
1733 while (count > 0 && !retry_eot) {
1734
1735 if (STbp->do_dio) {
1736 do_count = count;
1737 }
1738 else {
1739 if (STp->block_size == 0)
1740 do_count = count;
1741 else {
1742 do_count = STbp->buffer_blocks * STp->block_size -
1743 STbp->buffer_bytes;
1744 if (do_count > count)
1745 do_count = count;
1746 }
1747
1748 i = append_to_buffer(b_point, STbp, do_count);
1749 if (i) {
1750 retval = i;
1751 goto out;
1752 }
1753 }
1754 count -= do_count;
1755 b_point += do_count;
1756
1757 async_write = STp->block_size == 0 && !STbp->do_dio &&
1758 STm->do_async_writes && STps->eof < ST_EOM_OK;
1759
1760 if (STp->block_size != 0 && STm->do_buffer_writes &&
1761 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1762 STbp->buffer_bytes < STbp->buffer_size) {
1763 STp->dirty = 1;
1764 /* Don't write a buffer that is not full enough. */
1765 if (!async_write && count == 0)
1766 break;
1767 }
1768
1769 retry_write:
1770 if (STp->block_size == 0)
1771 blks = transfer = do_count;
1772 else {
1773 if (!STbp->do_dio)
1774 blks = STbp->buffer_bytes;
1775 else
1776 blks = do_count;
1777 blks /= STp->block_size;
1778 transfer = blks * STp->block_size;
1779 }
1780 cmd[2] = blks >> 16;
1781 cmd[3] = blks >> 8;
1782 cmd[4] = blks;
1783
1784 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1785 STp->device->request_queue->rq_timeout,
1786 MAX_WRITE_RETRIES, !async_write);
1787 if (!SRpnt) {
1788 retval = STbp->syscall_result;
1789 goto out;
1790 }
1791 if (async_write && !STbp->syscall_result) {
1792 STbp->writing = transfer;
1793 STp->dirty = !(STbp->writing ==
1794 STbp->buffer_bytes);
1795 SRpnt = NULL; /* Prevent releasing this request! */
1796 DEB( STp->write_pending = 1; )
1797 break;
1798 }
1799
1800 if (STbp->syscall_result != 0) {
1801 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1802
1803 DEBC_printk(STp, "Error on write:\n");
1804 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1805 scode = cmdstatp->sense_hdr.sense_key;
1806 if (cmdstatp->remainder_valid)
1807 undone = (int)cmdstatp->uremainder64;
1808 else if (STp->block_size == 0 &&
1809 scode == VOLUME_OVERFLOW)
1810 undone = transfer;
1811 else
1812 undone = 0;
1813 if (STp->block_size != 0)
1814 undone *= STp->block_size;
1815 if (undone <= do_count) {
1816 /* Only data from this write is not written */
1817 count += undone;
1818 b_point -= undone;
1819 do_count -= undone;
1820 if (STp->block_size)
1821 blks = (transfer - undone) / STp->block_size;
1822 STps->eof = ST_EOM_OK;
1823 /* Continue in fixed block mode if all written
1824 in this request but still something left to write
1825 (retval left to zero)
1826 */
1827 if (STp->block_size == 0 ||
1828 undone > 0 || count == 0)
1829 retval = (-ENOSPC); /* EOM within current request */
1830 DEBC_printk(STp, "EOM with %d "
1831 "bytes unwritten.\n",
1832 (int)count);
1833 } else {
1834 /* EOT within data buffered earlier (possible only
1835 in fixed block mode without direct i/o) */
1836 if (!retry_eot && !cmdstatp->deferred &&
1837 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1838 move_buffer_data(STp->buffer, transfer - undone);
1839 retry_eot = 1;
1840 if (STps->drv_block >= 0) {
1841 STps->drv_block += (transfer - undone) /
1842 STp->block_size;
1843 }
1844 STps->eof = ST_EOM_OK;
1845 DEBC_printk(STp, "Retry "
1846 "write of %d "
1847 "bytes at EOM.\n",
1848 STp->buffer->buffer_bytes);
1849 goto retry_write;
1850 }
1851 else {
1852 /* Either error within data buffered by driver or
1853 failed retry */
1854 count -= do_count;
1855 blks = do_count = 0;
1856 STps->eof = ST_EOM_ERROR;
1857 STps->drv_block = (-1); /* Too cautious? */
1858 retval = (-EIO); /* EOM for old data */
1859 DEBC_printk(STp, "EOM with "
1860 "lost data.\n");
1861 }
1862 }
1863 } else {
1864 count += do_count;
1865 STps->drv_block = (-1); /* Too cautious? */
1866 retval = STbp->syscall_result;
1867 }
1868
1869 }
1870
1871 if (STps->drv_block >= 0) {
1872 if (STp->block_size == 0)
1873 STps->drv_block += (do_count > 0);
1874 else
1875 STps->drv_block += blks;
1876 }
1877
1878 STbp->buffer_bytes = 0;
1879 STp->dirty = 0;
1880
1881 if (retval || retry_eot) {
1882 if (count < total)
1883 retval = total - count;
1884 goto out;
1885 }
1886 }
1887
1888 if (STps->eof == ST_EOD_1)
1889 STps->eof = ST_EOM_OK;
1890 else if (STps->eof != ST_EOM_OK)
1891 STps->eof = ST_NOEOF;
1892 retval = total - count;
1893
1894 out:
1895 if (SRpnt != NULL)
1896 st_release_request(SRpnt);
1897 release_buffering(STp, 0);
1898 mutex_unlock(&STp->lock);
1899
1900 return retval;
1901}
1902
1903/* Read data from the tape. Returns zero in the normal case, one if the
1904 eof status has changed, and the negative error code in case of a
1905 fatal error. Otherwise updates the buffer and the eof state.
1906
1907 Does release user buffer mapping if it is set.
1908*/
1909static long read_tape(struct scsi_tape *STp, long count,
1910 struct st_request ** aSRpnt)
1911{
1912 int transfer, blks, bytes;
1913 unsigned char cmd[MAX_COMMAND_SIZE];
1914 struct st_request *SRpnt;
1915 struct st_modedef *STm;
1916 struct st_partstat *STps;
1917 struct st_buffer *STbp;
1918 int retval = 0;
1919
1920 if (count == 0)
1921 return 0;
1922
1923 STm = &(STp->modes[STp->current_mode]);
1924 STps = &(STp->ps[STp->partition]);
1925 if (STps->eof == ST_FM_HIT)
1926 return 1;
1927 STbp = STp->buffer;
1928
1929 if (STp->block_size == 0)
1930 blks = bytes = count;
1931 else {
1932 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1933 blks = (STp->buffer)->buffer_blocks;
1934 bytes = blks * STp->block_size;
1935 } else {
1936 bytes = count;
1937 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1938 bytes = (STp->buffer)->buffer_size;
1939 blks = bytes / STp->block_size;
1940 bytes = blks * STp->block_size;
1941 }
1942 }
1943
1944 memset(cmd, 0, MAX_COMMAND_SIZE);
1945 cmd[0] = READ_6;
1946 cmd[1] = (STp->block_size != 0);
1947 if (!cmd[1] && STp->sili)
1948 cmd[1] |= 2;
1949 cmd[2] = blks >> 16;
1950 cmd[3] = blks >> 8;
1951 cmd[4] = blks;
1952
1953 SRpnt = *aSRpnt;
1954 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1955 STp->device->request_queue->rq_timeout,
1956 MAX_RETRIES, 1);
1957 release_buffering(STp, 1);
1958 *aSRpnt = SRpnt;
1959 if (!SRpnt)
1960 return STbp->syscall_result;
1961
1962 STbp->read_pointer = 0;
1963 STps->at_sm = 0;
1964
1965 /* Something to check */
1966 if (STbp->syscall_result) {
1967 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1968
1969 retval = 1;
1970 DEBC_printk(STp,
1971 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1972 SRpnt->sense[0], SRpnt->sense[1],
1973 SRpnt->sense[2], SRpnt->sense[3],
1974 SRpnt->sense[4], SRpnt->sense[5],
1975 SRpnt->sense[6], SRpnt->sense[7]);
1976 if (cmdstatp->have_sense) {
1977
1978 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1979 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1980
1981 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1982 /* Compute the residual count */
1983 if (cmdstatp->remainder_valid)
1984 transfer = (int)cmdstatp->uremainder64;
1985 else
1986 transfer = 0;
1987 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1988 if (STp->block_size == 0)
1989 transfer = bytes;
1990 /* Some drives set ILI with MEDIUM ERROR */
1991 cmdstatp->flags &= ~SENSE_ILI;
1992 }
1993
1994 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1995 if (STp->block_size == 0 &&
1996 transfer < 0) {
1997 st_printk(KERN_NOTICE, STp,
1998 "Failed to read %d "
1999 "byte block with %d "
2000 "byte transfer.\n",
2001 bytes - transfer,
2002 bytes);
2003 if (STps->drv_block >= 0)
2004 STps->drv_block += 1;
2005 STbp->buffer_bytes = 0;
2006 return (-ENOMEM);
2007 } else if (STp->block_size == 0) {
2008 STbp->buffer_bytes = bytes - transfer;
2009 } else {
2010 st_release_request(SRpnt);
2011 SRpnt = *aSRpnt = NULL;
2012 if (transfer == blks) { /* We did not get anything, error */
2013 st_printk(KERN_NOTICE, STp,
2014 "Incorrect "
2015 "block size.\n");
2016 if (STps->drv_block >= 0)
2017 STps->drv_block += blks - transfer + 1;
2018 st_int_ioctl(STp, MTBSR, 1);
2019 return (-EIO);
2020 }
2021 /* We have some data, deliver it */
2022 STbp->buffer_bytes = (blks - transfer) *
2023 STp->block_size;
2024 DEBC_printk(STp, "ILI but "
2025 "enough data "
2026 "received %ld "
2027 "%d.\n", count,
2028 STbp->buffer_bytes);
2029 if (STps->drv_block >= 0)
2030 STps->drv_block += 1;
2031 if (st_int_ioctl(STp, MTBSR, 1))
2032 return (-EIO);
2033 }
2034 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2035 if (STps->eof != ST_FM_HIT)
2036 STps->eof = ST_FM_HIT;
2037 else
2038 STps->eof = ST_EOD_2;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = 0;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044 DEBC_printk(STp, "EOF detected (%d "
2045 "bytes read).\n",
2046 STbp->buffer_bytes);
2047 } else if (cmdstatp->flags & SENSE_EOM) {
2048 if (STps->eof == ST_FM)
2049 STps->eof = ST_EOD_1;
2050 else
2051 STps->eof = ST_EOM_OK;
2052 if (STp->block_size == 0)
2053 STbp->buffer_bytes = bytes - transfer;
2054 else
2055 STbp->buffer_bytes =
2056 bytes - transfer * STp->block_size;
2057
2058 DEBC_printk(STp, "EOM detected (%d "
2059 "bytes read).\n",
2060 STbp->buffer_bytes);
2061 }
2062 }
2063 /* end of EOF, EOM, ILI test */
2064 else { /* nonzero sense key */
2065 DEBC_printk(STp, "Tape error while reading.\n");
2066 STps->drv_block = (-1);
2067 if (STps->eof == ST_FM &&
2068 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2069 DEBC_printk(STp, "Zero returned for "
2070 "first BLANK CHECK "
2071 "after EOF.\n");
2072 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2073 } else /* Some other extended sense code */
2074 retval = (-EIO);
2075 }
2076
2077 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2078 STbp->buffer_bytes = 0;
2079 }
2080 /* End of extended sense test */
2081 else { /* Non-extended sense */
2082 retval = STbp->syscall_result;
2083 }
2084
2085 }
2086 /* End of error handling */
2087 else { /* Read successful */
2088 STbp->buffer_bytes = bytes;
2089 if (STp->sili) /* In fixed block mode residual is always zero here */
2090 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2091 }
2092
2093 if (STps->drv_block >= 0) {
2094 if (STp->block_size == 0)
2095 STps->drv_block++;
2096 else
2097 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2098 }
2099 return retval;
2100}
2101
2102
2103/* Read command */
2104static ssize_t
2105st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2106{
2107 ssize_t total;
2108 ssize_t retval = 0;
2109 ssize_t i, transfer;
2110 int special, do_dio = 0;
2111 struct st_request *SRpnt = NULL;
2112 struct scsi_tape *STp = filp->private_data;
2113 struct st_modedef *STm;
2114 struct st_partstat *STps;
2115 struct st_buffer *STbp = STp->buffer;
2116
2117 if (mutex_lock_interruptible(&STp->lock))
2118 return -ERESTARTSYS;
2119
2120 retval = rw_checks(STp, filp, count);
2121 if (retval || count == 0)
2122 goto out;
2123
2124 STm = &(STp->modes[STp->current_mode]);
2125 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2126 if (!STm->do_read_ahead) {
2127 retval = (-EINVAL); /* Read must be integral number of blocks */
2128 goto out;
2129 }
2130 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2131 }
2132
2133 STps = &(STp->ps[STp->partition]);
2134 if (STps->rw == ST_WRITING) {
2135 retval = flush_buffer(STp, 0);
2136 if (retval)
2137 goto out;
2138 STps->rw = ST_READING;
2139 }
2140 DEB(
2141 if (debugging && STps->eof != ST_NOEOF)
2142 st_printk(ST_DEB_MSG, STp,
2143 "EOF/EOM flag up (%d). Bytes %d\n",
2144 STps->eof, STbp->buffer_bytes);
2145 ) /* end DEB */
2146
2147 retval = setup_buffering(STp, buf, count, 1);
2148 if (retval)
2149 goto out;
2150 do_dio = STbp->do_dio;
2151
2152 if (STbp->buffer_bytes == 0 &&
2153 STps->eof >= ST_EOD_1) {
2154 if (STps->eof < ST_EOD) {
2155 STps->eof += 1;
2156 retval = 0;
2157 goto out;
2158 }
2159 retval = (-EIO); /* EOM or Blank Check */
2160 goto out;
2161 }
2162
2163 if (do_dio) {
2164 /* Check the buffer writability before any tape movement. Don't alter
2165 buffer data. */
2166 if (copy_from_user(&i, buf, 1) != 0 ||
2167 copy_to_user(buf, &i, 1) != 0 ||
2168 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2169 copy_to_user(buf + count - 1, &i, 1) != 0) {
2170 retval = (-EFAULT);
2171 goto out;
2172 }
2173 }
2174
2175 STps->rw = ST_READING;
2176
2177
2178 /* Loop until enough data in buffer or a special condition found */
2179 for (total = 0, special = 0; total < count && !special;) {
2180
2181 /* Get new data if the buffer is empty */
2182 if (STbp->buffer_bytes == 0) {
2183 special = read_tape(STp, count - total, &SRpnt);
2184 if (special < 0) { /* No need to continue read */
2185 retval = special;
2186 goto out;
2187 }
2188 }
2189
2190 /* Move the data from driver buffer to user buffer */
2191 if (STbp->buffer_bytes > 0) {
2192 DEB(
2193 if (debugging && STps->eof != ST_NOEOF)
2194 st_printk(ST_DEB_MSG, STp,
2195 "EOF up (%d). Left %d, needed %d.\n",
2196 STps->eof, STbp->buffer_bytes,
2197 (int)(count - total));
2198 ) /* end DEB */
2199 transfer = STbp->buffer_bytes < count - total ?
2200 STbp->buffer_bytes : count - total;
2201 if (!do_dio) {
2202 i = from_buffer(STbp, buf, transfer);
2203 if (i) {
2204 retval = i;
2205 goto out;
2206 }
2207 }
2208 buf += transfer;
2209 total += transfer;
2210 }
2211
2212 if (STp->block_size == 0)
2213 break; /* Read only one variable length block */
2214
2215 } /* for (total = 0, special = 0;
2216 total < count && !special; ) */
2217
2218 /* Change the eof state if no data from tape or buffer */
2219 if (total == 0) {
2220 if (STps->eof == ST_FM_HIT) {
2221 STps->eof = ST_FM;
2222 STps->drv_block = 0;
2223 if (STps->drv_file >= 0)
2224 STps->drv_file++;
2225 } else if (STps->eof == ST_EOD_1) {
2226 STps->eof = ST_EOD_2;
2227 STps->drv_block = 0;
2228 if (STps->drv_file >= 0)
2229 STps->drv_file++;
2230 } else if (STps->eof == ST_EOD_2)
2231 STps->eof = ST_EOD;
2232 } else if (STps->eof == ST_FM)
2233 STps->eof = ST_NOEOF;
2234 retval = total;
2235
2236 out:
2237 if (SRpnt != NULL) {
2238 st_release_request(SRpnt);
2239 SRpnt = NULL;
2240 }
2241 if (do_dio) {
2242 release_buffering(STp, 1);
2243 STbp->buffer_bytes = 0;
2244 }
2245 mutex_unlock(&STp->lock);
2246
2247 return retval;
2248}
2249
2250
2251
2252DEB(
2253/* Set the driver options */
2254static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2255{
2256 if (debugging) {
2257 st_printk(KERN_INFO, STp,
2258 "Mode %d options: buffer writes: %d, "
2259 "async writes: %d, read ahead: %d\n",
2260 STp->current_mode, STm->do_buffer_writes,
2261 STm->do_async_writes, STm->do_read_ahead);
2262 st_printk(KERN_INFO, STp,
2263 " can bsr: %d, two FMs: %d, "
2264 "fast mteom: %d, auto lock: %d,\n",
2265 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2266 STp->do_auto_lock);
2267 st_printk(KERN_INFO, STp,
2268 " defs for wr: %d, no block limits: %d, "
2269 "partitions: %d, s2 log: %d\n",
2270 STm->defaults_for_writes, STp->omit_blklims,
2271 STp->can_partitions, STp->scsi2_logical);
2272 st_printk(KERN_INFO, STp,
2273 " sysv: %d nowait: %d sili: %d "
2274 "nowait_filemark: %d\n",
2275 STm->sysv, STp->immediate, STp->sili,
2276 STp->immediate_filemark);
2277 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2278 }
2279}
2280 )
2281
2282
2283static int st_set_options(struct scsi_tape *STp, long options)
2284{
2285 int value;
2286 long code;
2287 struct st_modedef *STm;
2288 struct cdev *cd0, *cd1;
2289 struct device *d0, *d1;
2290
2291 STm = &(STp->modes[STp->current_mode]);
2292 if (!STm->defined) {
2293 cd0 = STm->cdevs[0];
2294 cd1 = STm->cdevs[1];
2295 d0 = STm->devs[0];
2296 d1 = STm->devs[1];
2297 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2298 STm->cdevs[0] = cd0;
2299 STm->cdevs[1] = cd1;
2300 STm->devs[0] = d0;
2301 STm->devs[1] = d1;
2302 modes_defined = 1;
2303 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2304 STp->current_mode);
2305 }
2306
2307 code = options & MT_ST_OPTIONS;
2308 if (code == MT_ST_BOOLEANS) {
2309 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2310 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2311 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2312 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2313 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2314 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2315 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2316 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2317 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2318 if ((STp->device)->scsi_level >= SCSI_2)
2319 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2320 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2321 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2322 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2323 STm->sysv = (options & MT_ST_SYSV) != 0;
2324 STp->sili = (options & MT_ST_SILI) != 0;
2325 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2326 st_log_options(STp, STm); )
2327 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2328 value = (code == MT_ST_SETBOOLEANS);
2329 if ((options & MT_ST_BUFFER_WRITES) != 0)
2330 STm->do_buffer_writes = value;
2331 if ((options & MT_ST_ASYNC_WRITES) != 0)
2332 STm->do_async_writes = value;
2333 if ((options & MT_ST_DEF_WRITES) != 0)
2334 STm->defaults_for_writes = value;
2335 if ((options & MT_ST_READ_AHEAD) != 0)
2336 STm->do_read_ahead = value;
2337 if ((options & MT_ST_TWO_FM) != 0)
2338 STp->two_fm = value;
2339 if ((options & MT_ST_FAST_MTEOM) != 0)
2340 STp->fast_mteom = value;
2341 if ((options & MT_ST_AUTO_LOCK) != 0)
2342 STp->do_auto_lock = value;
2343 if ((options & MT_ST_CAN_BSR) != 0)
2344 STp->can_bsr = value;
2345 if ((options & MT_ST_NO_BLKLIMS) != 0)
2346 STp->omit_blklims = value;
2347 if ((STp->device)->scsi_level >= SCSI_2 &&
2348 (options & MT_ST_CAN_PARTITIONS) != 0)
2349 STp->can_partitions = value;
2350 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2351 STp->scsi2_logical = value;
2352 if ((options & MT_ST_NOWAIT) != 0)
2353 STp->immediate = value;
2354 if ((options & MT_ST_NOWAIT_EOF) != 0)
2355 STp->immediate_filemark = value;
2356 if ((options & MT_ST_SYSV) != 0)
2357 STm->sysv = value;
2358 if ((options & MT_ST_SILI) != 0)
2359 STp->sili = value;
2360 DEB(
2361 if ((options & MT_ST_DEBUGGING) != 0)
2362 debugging = value;
2363 st_log_options(STp, STm); )
2364 } else if (code == MT_ST_WRITE_THRESHOLD) {
2365 /* Retained for compatibility */
2366 } else if (code == MT_ST_DEF_BLKSIZE) {
2367 value = (options & ~MT_ST_OPTIONS);
2368 if (value == ~MT_ST_OPTIONS) {
2369 STm->default_blksize = (-1);
2370 DEBC_printk(STp, "Default block size disabled.\n");
2371 } else {
2372 STm->default_blksize = value;
2373 DEBC_printk(STp,"Default block size set to "
2374 "%d bytes.\n", STm->default_blksize);
2375 if (STp->ready == ST_READY) {
2376 STp->blksize_changed = 0;
2377 set_mode_densblk(STp, STm);
2378 }
2379 }
2380 } else if (code == MT_ST_TIMEOUTS) {
2381 value = (options & ~MT_ST_OPTIONS);
2382 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2383 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2384 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2385 (value & ~MT_ST_SET_LONG_TIMEOUT));
2386 } else {
2387 blk_queue_rq_timeout(STp->device->request_queue,
2388 value * HZ);
2389 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2390 value);
2391 }
2392 } else if (code == MT_ST_SET_CLN) {
2393 value = (options & ~MT_ST_OPTIONS) & 0xff;
2394 if (value != 0 &&
2395 (value < EXTENDED_SENSE_START ||
2396 value >= SCSI_SENSE_BUFFERSIZE))
2397 return (-EINVAL);
2398 STp->cln_mode = value;
2399 STp->cln_sense_mask = (options >> 8) & 0xff;
2400 STp->cln_sense_value = (options >> 16) & 0xff;
2401 st_printk(KERN_INFO, STp,
2402 "Cleaning request mode %d, mask %02x, value %02x\n",
2403 value, STp->cln_sense_mask, STp->cln_sense_value);
2404 } else if (code == MT_ST_DEF_OPTIONS) {
2405 code = (options & ~MT_ST_CLEAR_DEFAULT);
2406 value = (options & MT_ST_CLEAR_DEFAULT);
2407 if (code == MT_ST_DEF_DENSITY) {
2408 if (value == MT_ST_CLEAR_DEFAULT) {
2409 STm->default_density = (-1);
2410 DEBC_printk(STp,
2411 "Density default disabled.\n");
2412 } else {
2413 STm->default_density = value & 0xff;
2414 DEBC_printk(STp, "Density default set to %x\n",
2415 STm->default_density);
2416 if (STp->ready == ST_READY) {
2417 STp->density_changed = 0;
2418 set_mode_densblk(STp, STm);
2419 }
2420 }
2421 } else if (code == MT_ST_DEF_DRVBUFFER) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STp->default_drvbuffer = 0xff;
2424 DEBC_printk(STp,
2425 "Drive buffer default disabled.\n");
2426 } else {
2427 STp->default_drvbuffer = value & 7;
2428 DEBC_printk(STp,
2429 "Drive buffer default set to %x\n",
2430 STp->default_drvbuffer);
2431 if (STp->ready == ST_READY)
2432 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2433 }
2434 } else if (code == MT_ST_DEF_COMPRESSION) {
2435 if (value == MT_ST_CLEAR_DEFAULT) {
2436 STm->default_compression = ST_DONT_TOUCH;
2437 DEBC_printk(STp,
2438 "Compression default disabled.\n");
2439 } else {
2440 if ((value & 0xff00) != 0) {
2441 STp->c_algo = (value & 0xff00) >> 8;
2442 DEBC_printk(STp, "Compression "
2443 "algorithm set to 0x%x.\n",
2444 STp->c_algo);
2445 }
2446 if ((value & 0xff) != 0xff) {
2447 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2448 DEBC_printk(STp, "Compression default "
2449 "set to %x\n",
2450 (value & 1));
2451 if (STp->ready == ST_READY) {
2452 STp->compression_changed = 0;
2453 st_compression(STp, (STm->default_compression == ST_YES));
2454 }
2455 }
2456 }
2457 }
2458 } else
2459 return (-EIO);
2460
2461 return 0;
2462}
2463
2464#define MODE_HEADER_LENGTH 4
2465
2466/* Mode header and page byte offsets */
2467#define MH_OFF_DATA_LENGTH 0
2468#define MH_OFF_MEDIUM_TYPE 1
2469#define MH_OFF_DEV_SPECIFIC 2
2470#define MH_OFF_BDESCS_LENGTH 3
2471#define MP_OFF_PAGE_NBR 0
2472#define MP_OFF_PAGE_LENGTH 1
2473
2474/* Mode header and page bit masks */
2475#define MH_BIT_WP 0x80
2476#define MP_MSK_PAGE_NBR 0x3f
2477
2478/* Don't return block descriptors */
2479#define MODE_SENSE_OMIT_BDESCS 0x08
2480
2481#define MODE_SELECT_PAGE_FORMAT 0x10
2482
2483/* Read a mode page into the tape buffer. The block descriptors are included
2484 if incl_block_descs is true. The page control is ored to the page number
2485 parameter, if necessary. */
2486static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2487{
2488 unsigned char cmd[MAX_COMMAND_SIZE];
2489 struct st_request *SRpnt;
2490
2491 memset(cmd, 0, MAX_COMMAND_SIZE);
2492 cmd[0] = MODE_SENSE;
2493 if (omit_block_descs)
2494 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2495 cmd[2] = page;
2496 cmd[4] = 255;
2497
2498 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2499 STp->device->request_queue->rq_timeout, 0, 1);
2500 if (SRpnt == NULL)
2501 return (STp->buffer)->syscall_result;
2502
2503 st_release_request(SRpnt);
2504
2505 return STp->buffer->syscall_result;
2506}
2507
2508
2509/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2510 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2511static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2512{
2513 int pgo;
2514 unsigned char cmd[MAX_COMMAND_SIZE];
2515 struct st_request *SRpnt;
2516 int timeout;
2517
2518 memset(cmd, 0, MAX_COMMAND_SIZE);
2519 cmd[0] = MODE_SELECT;
2520 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2521 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2522 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2523
2524 /* Clear reserved fields */
2525 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2526 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2527 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2528 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2529
2530 timeout = slow ?
2531 STp->long_timeout : STp->device->request_queue->rq_timeout;
2532 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2533 timeout, 0, 1);
2534 if (SRpnt == NULL)
2535 return (STp->buffer)->syscall_result;
2536
2537 st_release_request(SRpnt);
2538
2539 return STp->buffer->syscall_result;
2540}
2541
2542
2543#define COMPRESSION_PAGE 0x0f
2544#define COMPRESSION_PAGE_LENGTH 16
2545
2546#define CP_OFF_DCE_DCC 2
2547#define CP_OFF_C_ALGO 7
2548
2549#define DCE_MASK 0x80
2550#define DCC_MASK 0x40
2551#define RED_MASK 0x60
2552
2553
2554/* Control the compression with mode page 15. Algorithm not changed if zero.
2555
2556 The block descriptors are read and written because Sony SDT-7000 does not
2557 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2558 Including block descriptors should not cause any harm to other drives. */
2559
2560static int st_compression(struct scsi_tape * STp, int state)
2561{
2562 int retval;
2563 int mpoffs; /* Offset to mode page start */
2564 unsigned char *b_data = (STp->buffer)->b_data;
2565
2566 if (STp->ready != ST_READY)
2567 return (-EIO);
2568
2569 /* Read the current page contents */
2570 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2571 if (retval) {
2572 DEBC_printk(STp, "Compression mode page not supported.\n");
2573 return (-EIO);
2574 }
2575
2576 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2577 DEBC_printk(STp, "Compression state is %d.\n",
2578 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2579
2580 /* Check if compression can be changed */
2581 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2582 DEBC_printk(STp, "Compression not supported.\n");
2583 return (-EIO);
2584 }
2585
2586 /* Do the change */
2587 if (state) {
2588 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2589 if (STp->c_algo != 0)
2590 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2591 }
2592 else {
2593 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2594 if (STp->c_algo != 0)
2595 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2596 }
2597
2598 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2599 if (retval) {
2600 DEBC_printk(STp, "Compression change failed.\n");
2601 return (-EIO);
2602 }
2603 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2604
2605 STp->compression_changed = 1;
2606 return 0;
2607}
2608
2609
2610/* Process the load and unload commands (does unload if the load code is zero) */
2611static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2612{
2613 int retval = (-EIO), timeout;
2614 unsigned char cmd[MAX_COMMAND_SIZE];
2615 struct st_partstat *STps;
2616 struct st_request *SRpnt;
2617
2618 if (STp->ready != ST_READY && !load_code) {
2619 if (STp->ready == ST_NO_TAPE)
2620 return (-ENOMEDIUM);
2621 else
2622 return (-EIO);
2623 }
2624
2625 memset(cmd, 0, MAX_COMMAND_SIZE);
2626 cmd[0] = START_STOP;
2627 if (load_code)
2628 cmd[4] |= 1;
2629 /*
2630 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2631 */
2632 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2633 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2634 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2635 (cmd[4]) ? "" : "un",
2636 load_code - MT_ST_HPLOADER_OFFSET);
2637 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2638 }
2639 if (STp->immediate) {
2640 cmd[1] = 1; /* Don't wait for completion */
2641 timeout = STp->device->request_queue->rq_timeout;
2642 }
2643 else
2644 timeout = STp->long_timeout;
2645
2646 DEBC(
2647 if (!load_code)
2648 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2649 else
2650 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2651 );
2652
2653 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2654 timeout, MAX_RETRIES, 1);
2655 if (!SRpnt)
2656 return (STp->buffer)->syscall_result;
2657
2658 retval = (STp->buffer)->syscall_result;
2659 st_release_request(SRpnt);
2660
2661 if (!retval) { /* SCSI command successful */
2662
2663 if (!load_code) {
2664 STp->rew_at_close = 0;
2665 STp->ready = ST_NO_TAPE;
2666 }
2667 else {
2668 STp->rew_at_close = STp->autorew_dev;
2669 retval = check_tape(STp, filp);
2670 if (retval > 0)
2671 retval = 0;
2672 }
2673 }
2674 else {
2675 STps = &(STp->ps[STp->partition]);
2676 STps->drv_file = STps->drv_block = (-1);
2677 }
2678
2679 return retval;
2680}
2681
2682#if DEBUG
2683#define ST_DEB_FORWARD 0
2684#define ST_DEB_BACKWARD 1
2685static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2686{
2687 s32 sc;
2688
2689 if (!debugging)
2690 return;
2691
2692 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23);
2693 if (direction)
2694 sc = -sc;
2695 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2696 direction ? "backward" : "forward", sc, units);
2697}
2698#else
2699#define ST_DEB_FORWARD 0
2700#define ST_DEB_BACKWARD 1
2701static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2702#endif
2703
2704
2705/* Internal ioctl function */
2706static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2707{
2708 int timeout;
2709 long ltmp;
2710 int ioctl_result;
2711 int chg_eof = 1;
2712 unsigned char cmd[MAX_COMMAND_SIZE];
2713 struct st_request *SRpnt;
2714 struct st_partstat *STps;
2715 int fileno, blkno, at_sm, undone;
2716 int datalen = 0, direction = DMA_NONE;
2717
2718 WARN_ON(STp->buffer->do_dio != 0);
2719 if (STp->ready != ST_READY) {
2720 if (STp->ready == ST_NO_TAPE)
2721 return (-ENOMEDIUM);
2722 else
2723 return (-EIO);
2724 }
2725 timeout = STp->long_timeout;
2726 STps = &(STp->ps[STp->partition]);
2727 fileno = STps->drv_file;
2728 blkno = STps->drv_block;
2729 at_sm = STps->at_sm;
2730
2731 memset(cmd, 0, MAX_COMMAND_SIZE);
2732 switch (cmd_in) {
2733 case MTFSFM:
2734 chg_eof = 0; /* Changed from the FSF after this */
2735 fallthrough;
2736 case MTFSF:
2737 cmd[0] = SPACE;
2738 cmd[1] = 0x01; /* Space FileMarks */
2739 cmd[2] = (arg >> 16);
2740 cmd[3] = (arg >> 8);
2741 cmd[4] = arg;
2742 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2743 if (fileno >= 0)
2744 fileno += arg;
2745 blkno = 0;
2746 at_sm &= (arg == 0);
2747 break;
2748 case MTBSFM:
2749 chg_eof = 0; /* Changed from the FSF after this */
2750 fallthrough;
2751 case MTBSF:
2752 cmd[0] = SPACE;
2753 cmd[1] = 0x01; /* Space FileMarks */
2754 ltmp = (-arg);
2755 cmd[2] = (ltmp >> 16);
2756 cmd[3] = (ltmp >> 8);
2757 cmd[4] = ltmp;
2758 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2759 if (fileno >= 0)
2760 fileno -= arg;
2761 blkno = (-1); /* We can't know the block number */
2762 at_sm &= (arg == 0);
2763 break;
2764 case MTFSR:
2765 cmd[0] = SPACE;
2766 cmd[1] = 0x00; /* Space Blocks */
2767 cmd[2] = (arg >> 16);
2768 cmd[3] = (arg >> 8);
2769 cmd[4] = arg;
2770 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2771 if (blkno >= 0)
2772 blkno += arg;
2773 at_sm &= (arg == 0);
2774 break;
2775 case MTBSR:
2776 cmd[0] = SPACE;
2777 cmd[1] = 0x00; /* Space Blocks */
2778 ltmp = (-arg);
2779 cmd[2] = (ltmp >> 16);
2780 cmd[3] = (ltmp >> 8);
2781 cmd[4] = ltmp;
2782 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2783 if (blkno >= 0)
2784 blkno -= arg;
2785 at_sm &= (arg == 0);
2786 break;
2787 case MTFSS:
2788 cmd[0] = SPACE;
2789 cmd[1] = 0x04; /* Space Setmarks */
2790 cmd[2] = (arg >> 16);
2791 cmd[3] = (arg >> 8);
2792 cmd[4] = arg;
2793 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2794 if (arg != 0) {
2795 blkno = fileno = (-1);
2796 at_sm = 1;
2797 }
2798 break;
2799 case MTBSS:
2800 cmd[0] = SPACE;
2801 cmd[1] = 0x04; /* Space Setmarks */
2802 ltmp = (-arg);
2803 cmd[2] = (ltmp >> 16);
2804 cmd[3] = (ltmp >> 8);
2805 cmd[4] = ltmp;
2806 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2807 if (arg != 0) {
2808 blkno = fileno = (-1);
2809 at_sm = 1;
2810 }
2811 break;
2812 case MTWEOF:
2813 case MTWEOFI:
2814 case MTWSM:
2815 if (STp->write_prot)
2816 return (-EACCES);
2817 cmd[0] = WRITE_FILEMARKS;
2818 if (cmd_in == MTWSM)
2819 cmd[1] = 2;
2820 if (cmd_in == MTWEOFI ||
2821 (cmd_in == MTWEOF && STp->immediate_filemark))
2822 cmd[1] |= 1;
2823 cmd[2] = (arg >> 16);
2824 cmd[3] = (arg >> 8);
2825 cmd[4] = arg;
2826 timeout = STp->device->request_queue->rq_timeout;
2827 DEBC(
2828 if (cmd_in != MTWSM)
2829 st_printk(ST_DEB_MSG, STp,
2830 "Writing %d filemarks.\n",
2831 cmd[2] * 65536 +
2832 cmd[3] * 256 +
2833 cmd[4]);
2834 else
2835 st_printk(ST_DEB_MSG, STp,
2836 "Writing %d setmarks.\n",
2837 cmd[2] * 65536 +
2838 cmd[3] * 256 +
2839 cmd[4]);
2840 )
2841 if (fileno >= 0)
2842 fileno += arg;
2843 blkno = 0;
2844 at_sm = (cmd_in == MTWSM);
2845 break;
2846 case MTREW:
2847 cmd[0] = REZERO_UNIT;
2848 if (STp->immediate) {
2849 cmd[1] = 1; /* Don't wait for completion */
2850 timeout = STp->device->request_queue->rq_timeout;
2851 }
2852 DEBC_printk(STp, "Rewinding tape.\n");
2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTNOP:
2856 DEBC_printk(STp, "No op on tape.\n");
2857 return 0; /* Should do something ? */
2858 case MTRETEN:
2859 cmd[0] = START_STOP;
2860 if (STp->immediate) {
2861 cmd[1] = 1; /* Don't wait for completion */
2862 timeout = STp->device->request_queue->rq_timeout;
2863 }
2864 cmd[4] = 3;
2865 DEBC_printk(STp, "Retensioning tape.\n");
2866 fileno = blkno = at_sm = 0;
2867 break;
2868 case MTEOM:
2869 if (!STp->fast_mteom) {
2870 /* space to the end of tape */
2871 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2872 fileno = STps->drv_file;
2873 if (STps->eof >= ST_EOD_1)
2874 return 0;
2875 /* The next lines would hide the number of spaced FileMarks
2876 That's why I inserted the previous lines. I had no luck
2877 with detecting EOM with FSF, so we go now to EOM.
2878 Joerg Weule */
2879 } else
2880 fileno = (-1);
2881 cmd[0] = SPACE;
2882 cmd[1] = 3;
2883 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2884 blkno = -1;
2885 at_sm = 0;
2886 break;
2887 case MTERASE:
2888 if (STp->write_prot)
2889 return (-EACCES);
2890 cmd[0] = ERASE;
2891 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2892 if (STp->immediate) {
2893 cmd[1] |= 2; /* Don't wait for completion */
2894 timeout = STp->device->request_queue->rq_timeout;
2895 }
2896 else
2897 timeout = STp->long_timeout * 8;
2898
2899 DEBC_printk(STp, "Erasing tape.\n");
2900 fileno = blkno = at_sm = 0;
2901 break;
2902 case MTSETBLK: /* Set block length */
2903 case MTSETDENSITY: /* Set tape density */
2904 case MTSETDRVBUFFER: /* Set drive buffering */
2905 case SET_DENS_AND_BLK: /* Set density and block size */
2906 chg_eof = 0;
2907 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2908 return (-EIO); /* Not allowed if data in buffer */
2909 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2910 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2911 STp->max_block > 0 &&
2912 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2913 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2914 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2915 return (-EINVAL);
2916 }
2917 cmd[0] = MODE_SELECT;
2918 if ((STp->use_pf & USE_PF))
2919 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2920 cmd[4] = datalen = 12;
2921 direction = DMA_TO_DEVICE;
2922
2923 memset((STp->buffer)->b_data, 0, 12);
2924 if (cmd_in == MTSETDRVBUFFER)
2925 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2926 else
2927 (STp->buffer)->b_data[2] =
2928 STp->drv_buffer << 4;
2929 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2930 if (cmd_in == MTSETDENSITY) {
2931 (STp->buffer)->b_data[4] = arg;
2932 STp->density_changed = 1; /* At least we tried ;-) */
2933 } else if (cmd_in == SET_DENS_AND_BLK)
2934 (STp->buffer)->b_data[4] = arg >> 24;
2935 else
2936 (STp->buffer)->b_data[4] = STp->density;
2937 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2938 ltmp = arg & MT_ST_BLKSIZE_MASK;
2939 if (cmd_in == MTSETBLK)
2940 STp->blksize_changed = 1; /* At least we tried ;-) */
2941 } else
2942 ltmp = STp->block_size;
2943 (STp->buffer)->b_data[9] = (ltmp >> 16);
2944 (STp->buffer)->b_data[10] = (ltmp >> 8);
2945 (STp->buffer)->b_data[11] = ltmp;
2946 timeout = STp->device->request_queue->rq_timeout;
2947 DEBC(
2948 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2949 st_printk(ST_DEB_MSG, STp,
2950 "Setting block size to %d bytes.\n",
2951 (STp->buffer)->b_data[9] * 65536 +
2952 (STp->buffer)->b_data[10] * 256 +
2953 (STp->buffer)->b_data[11]);
2954 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2955 st_printk(ST_DEB_MSG, STp,
2956 "Setting density code to %x.\n",
2957 (STp->buffer)->b_data[4]);
2958 if (cmd_in == MTSETDRVBUFFER)
2959 st_printk(ST_DEB_MSG, STp,
2960 "Setting drive buffer code to %d.\n",
2961 ((STp->buffer)->b_data[2] >> 4) & 7);
2962 )
2963 break;
2964 default:
2965 return (-ENOSYS);
2966 }
2967
2968 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2969 timeout, MAX_RETRIES, 1);
2970 if (!SRpnt)
2971 return (STp->buffer)->syscall_result;
2972
2973 ioctl_result = (STp->buffer)->syscall_result;
2974
2975 if (!ioctl_result) { /* SCSI command successful */
2976 st_release_request(SRpnt);
2977 SRpnt = NULL;
2978 STps->drv_block = blkno;
2979 STps->drv_file = fileno;
2980 STps->at_sm = at_sm;
2981
2982 if (cmd_in == MTBSFM)
2983 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2984 else if (cmd_in == MTFSFM)
2985 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2986
2987 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2988 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2989 if (STp->block_size != 0) {
2990 (STp->buffer)->buffer_blocks =
2991 (STp->buffer)->buffer_size / STp->block_size;
2992 }
2993 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2994 if (cmd_in == SET_DENS_AND_BLK)
2995 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2996 } else if (cmd_in == MTSETDRVBUFFER)
2997 STp->drv_buffer = (arg & 7);
2998 else if (cmd_in == MTSETDENSITY)
2999 STp->density = arg;
3000
3001 if (cmd_in == MTEOM)
3002 STps->eof = ST_EOD;
3003 else if (cmd_in == MTFSF)
3004 STps->eof = ST_FM;
3005 else if (chg_eof)
3006 STps->eof = ST_NOEOF;
3007
3008 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3009 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3010 } else { /* SCSI command was not completely successful. Don't return
3011 from this block without releasing the SCSI command block! */
3012 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3013
3014 if (cmdstatp->flags & SENSE_EOM) {
3015 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3016 cmd_in != MTBSR && cmd_in != MTBSS)
3017 STps->eof = ST_EOM_OK;
3018 STps->drv_block = 0;
3019 }
3020
3021 if (cmdstatp->remainder_valid)
3022 undone = (int)cmdstatp->uremainder64;
3023 else
3024 undone = 0;
3025
3026 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3027 cmdstatp->have_sense &&
3028 (cmdstatp->flags & SENSE_EOM)) {
3029 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3030 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3031 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3032 STps->eof = ST_NOEOF;
3033 } else { /* Writing EOF(s) failed */
3034 if (fileno >= 0)
3035 fileno -= undone;
3036 if (undone < arg)
3037 STps->eof = ST_NOEOF;
3038 }
3039 STps->drv_file = fileno;
3040 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3041 if (fileno >= 0)
3042 STps->drv_file = fileno - undone;
3043 else
3044 STps->drv_file = fileno;
3045 STps->drv_block = -1;
3046 STps->eof = ST_NOEOF;
3047 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3048 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3049 undone = (-undone);
3050 if (STps->drv_file >= 0)
3051 STps->drv_file = fileno + undone;
3052 STps->drv_block = 0;
3053 STps->eof = ST_NOEOF;
3054 } else if (cmd_in == MTFSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 if (STps->drv_file >= 0)
3057 STps->drv_file++;
3058 STps->drv_block = 0;
3059 STps->eof = ST_FM;
3060 } else {
3061 if (blkno >= undone)
3062 STps->drv_block = blkno - undone;
3063 else
3064 STps->drv_block = (-1);
3065 STps->eof = ST_NOEOF;
3066 }
3067 } else if (cmd_in == MTBSR) {
3068 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3069 STps->drv_file--;
3070 STps->drv_block = (-1);
3071 } else {
3072 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3073 undone = (-undone);
3074 if (STps->drv_block >= 0)
3075 STps->drv_block = blkno + undone;
3076 }
3077 STps->eof = ST_NOEOF;
3078 } else if (cmd_in == MTEOM) {
3079 STps->drv_file = (-1);
3080 STps->drv_block = (-1);
3081 STps->eof = ST_EOD;
3082 } else if (cmd_in == MTSETBLK ||
3083 cmd_in == MTSETDENSITY ||
3084 cmd_in == MTSETDRVBUFFER ||
3085 cmd_in == SET_DENS_AND_BLK) {
3086 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3087 !(STp->use_pf & PF_TESTED)) {
3088 /* Try the other possible state of Page Format if not
3089 already tried */
3090 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3091 st_release_request(SRpnt);
3092 SRpnt = NULL;
3093 return st_int_ioctl(STp, cmd_in, arg);
3094 }
3095 } else if (chg_eof)
3096 STps->eof = ST_NOEOF;
3097
3098 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3099 STps->eof = ST_EOD;
3100
3101 st_release_request(SRpnt);
3102 SRpnt = NULL;
3103 }
3104
3105 return ioctl_result;
3106}
3107
3108
3109/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3110 structure. */
3111
3112static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3113 int logical)
3114{
3115 int result;
3116 unsigned char scmd[MAX_COMMAND_SIZE];
3117 struct st_request *SRpnt;
3118
3119 if (STp->ready != ST_READY)
3120 return (-EIO);
3121
3122 memset(scmd, 0, MAX_COMMAND_SIZE);
3123 if ((STp->device)->scsi_level < SCSI_2) {
3124 scmd[0] = QFA_REQUEST_BLOCK;
3125 scmd[4] = 3;
3126 } else {
3127 scmd[0] = READ_POSITION;
3128 if (!logical && !STp->scsi2_logical)
3129 scmd[1] = 1;
3130 }
3131 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3132 STp->device->request_queue->rq_timeout,
3133 MAX_READY_RETRIES, 1);
3134 if (!SRpnt)
3135 return (STp->buffer)->syscall_result;
3136
3137 if ((STp->buffer)->syscall_result != 0 ||
3138 (STp->device->scsi_level >= SCSI_2 &&
3139 ((STp->buffer)->b_data[0] & 4) != 0)) {
3140 *block = *partition = 0;
3141 DEBC_printk(STp, " Can't read tape position.\n");
3142 result = (-EIO);
3143 } else {
3144 result = 0;
3145 if ((STp->device)->scsi_level < SCSI_2) {
3146 *block = ((STp->buffer)->b_data[0] << 16)
3147 + ((STp->buffer)->b_data[1] << 8)
3148 + (STp->buffer)->b_data[2];
3149 *partition = 0;
3150 } else {
3151 *block = ((STp->buffer)->b_data[4] << 24)
3152 + ((STp->buffer)->b_data[5] << 16)
3153 + ((STp->buffer)->b_data[6] << 8)
3154 + (STp->buffer)->b_data[7];
3155 *partition = (STp->buffer)->b_data[1];
3156 if (((STp->buffer)->b_data[0] & 0x80) &&
3157 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3158 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3159 }
3160 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3161 *block, *partition);
3162 }
3163 st_release_request(SRpnt);
3164 SRpnt = NULL;
3165
3166 return result;
3167}
3168
3169
3170/* Set the tape block and partition. Negative partition means that only the
3171 block should be set in vendor specific way. */
3172static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3173 int logical)
3174{
3175 struct st_partstat *STps;
3176 int result, p;
3177 unsigned int blk;
3178 int timeout;
3179 unsigned char scmd[MAX_COMMAND_SIZE];
3180 struct st_request *SRpnt;
3181
3182 if (STp->ready != ST_READY)
3183 return (-EIO);
3184 timeout = STp->long_timeout;
3185 STps = &(STp->ps[STp->partition]);
3186
3187 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3188 block, partition);
3189 DEB(if (partition < 0)
3190 return (-EIO); )
3191
3192 /* Update the location at the partition we are leaving */
3193 if ((!STp->can_partitions && partition != 0) ||
3194 partition >= ST_NBR_PARTITIONS)
3195 return (-EINVAL);
3196 if (partition != STp->partition) {
3197 if (get_location(STp, &blk, &p, 1))
3198 STps->last_block_valid = 0;
3199 else {
3200 STps->last_block_valid = 1;
3201 STps->last_block_visited = blk;
3202 DEBC_printk(STp, "Visited block %d for "
3203 "partition %d saved.\n",
3204 blk, STp->partition);
3205 }
3206 }
3207
3208 memset(scmd, 0, MAX_COMMAND_SIZE);
3209 if ((STp->device)->scsi_level < SCSI_2) {
3210 scmd[0] = QFA_SEEK_BLOCK;
3211 scmd[2] = (block >> 16);
3212 scmd[3] = (block >> 8);
3213 scmd[4] = block;
3214 scmd[5] = 0;
3215 } else {
3216 scmd[0] = SEEK_10;
3217 scmd[3] = (block >> 24);
3218 scmd[4] = (block >> 16);
3219 scmd[5] = (block >> 8);
3220 scmd[6] = block;
3221 if (!logical && !STp->scsi2_logical)
3222 scmd[1] = 4;
3223 if (STp->partition != partition) {
3224 scmd[1] |= 2;
3225 scmd[8] = partition;
3226 DEBC_printk(STp, "Trying to change partition "
3227 "from %d to %d\n", STp->partition,
3228 partition);
3229 }
3230 }
3231 if (STp->immediate) {
3232 scmd[1] |= 1; /* Don't wait for completion */
3233 timeout = STp->device->request_queue->rq_timeout;
3234 }
3235
3236 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3237 timeout, MAX_READY_RETRIES, 1);
3238 if (!SRpnt)
3239 return (STp->buffer)->syscall_result;
3240
3241 STps->drv_block = STps->drv_file = (-1);
3242 STps->eof = ST_NOEOF;
3243 if ((STp->buffer)->syscall_result != 0) {
3244 result = (-EIO);
3245 if (STp->can_partitions &&
3246 (STp->device)->scsi_level >= SCSI_2 &&
3247 (p = find_partition(STp)) >= 0)
3248 STp->partition = p;
3249 } else {
3250 if (STp->can_partitions) {
3251 STp->partition = partition;
3252 STps = &(STp->ps[partition]);
3253 if (!STps->last_block_valid ||
3254 STps->last_block_visited != block) {
3255 STps->at_sm = 0;
3256 STps->rw = ST_IDLE;
3257 }
3258 } else
3259 STps->at_sm = 0;
3260 if (block == 0)
3261 STps->drv_block = STps->drv_file = 0;
3262 result = 0;
3263 }
3264
3265 st_release_request(SRpnt);
3266 SRpnt = NULL;
3267
3268 return result;
3269}
3270
3271
3272/* Find the current partition number for the drive status. Called from open and
3273 returns either partition number of negative error code. */
3274static int find_partition(struct scsi_tape *STp)
3275{
3276 int i, partition;
3277 unsigned int block;
3278
3279 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3280 return i;
3281 if (partition >= ST_NBR_PARTITIONS)
3282 return (-EIO);
3283 return partition;
3284}
3285
3286
3287/* Change the partition if necessary */
3288static int switch_partition(struct scsi_tape *STp)
3289{
3290 struct st_partstat *STps;
3291
3292 if (STp->partition == STp->new_partition)
3293 return 0;
3294 STps = &(STp->ps[STp->new_partition]);
3295 if (!STps->last_block_valid)
3296 STps->last_block_visited = 0;
3297 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3298}
3299
3300/* Functions for reading and writing the medium partition mode page. */
3301
3302#define PART_PAGE 0x11
3303#define PART_PAGE_FIXED_LENGTH 8
3304
3305#define PP_OFF_MAX_ADD_PARTS 2
3306#define PP_OFF_NBR_ADD_PARTS 3
3307#define PP_OFF_FLAGS 4
3308#define PP_OFF_PART_UNITS 6
3309#define PP_OFF_RESERVED 7
3310
3311#define PP_BIT_IDP 0x20
3312#define PP_BIT_FDP 0x80
3313#define PP_MSK_PSUM_MB 0x10
3314#define PP_MSK_PSUM_UNITS 0x18
3315#define PP_MSK_POFM 0x04
3316
3317/* Get the number of partitions on the tape. As a side effect reads the
3318 mode page into the tape buffer. */
3319static int nbr_partitions(struct scsi_tape *STp)
3320{
3321 int result;
3322
3323 if (STp->ready != ST_READY)
3324 return (-EIO);
3325
3326 result = read_mode_page(STp, PART_PAGE, 1);
3327
3328 if (result) {
3329 DEBC_printk(STp, "Can't read medium partition page.\n");
3330 result = (-EIO);
3331 } else {
3332 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3333 PP_OFF_NBR_ADD_PARTS] + 1;
3334 DEBC_printk(STp, "Number of partitions %d.\n", result);
3335 }
3336
3337 return result;
3338}
3339
3340
3341static int format_medium(struct scsi_tape *STp, int format)
3342{
3343 int result = 0;
3344 int timeout = STp->long_timeout;
3345 unsigned char scmd[MAX_COMMAND_SIZE];
3346 struct st_request *SRpnt;
3347
3348 memset(scmd, 0, MAX_COMMAND_SIZE);
3349 scmd[0] = FORMAT_UNIT;
3350 scmd[2] = format;
3351 if (STp->immediate) {
3352 scmd[1] |= 1; /* Don't wait for completion */
3353 timeout = STp->device->request_queue->rq_timeout;
3354 }
3355 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3356 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3357 timeout, MAX_RETRIES, 1);
3358 if (!SRpnt)
3359 result = STp->buffer->syscall_result;
3360 return result;
3361}
3362
3363
3364/* Partition the tape into two partitions if size > 0 or one partition if
3365 size == 0.
3366
3367 The block descriptors are read and written because Sony SDT-7000 does not
3368 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3369
3370 My HP C1533A drive returns only one partition size field. This is used to
3371 set the size of partition 1. There is no size field for the default partition.
3372 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3373 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3374 The following algorithm is used to accommodate both drives: if the number of
3375 partition size fields is greater than the maximum number of additional partitions
3376 in the mode page, the second field is used. Otherwise the first field is used.
3377
3378 For Seagate DDS drives the page length must be 8 when no partitions is defined
3379 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3380 is acceptable also to some other old drives and enforced if the first partition
3381 size field is used for the first additional partition size.
3382
3383 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3384 */
3385static int partition_tape(struct scsi_tape *STp, int size)
3386{
3387 int result;
3388 int target_partition;
3389 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3390 int pgo, psd_cnt, psdo;
3391 int psum = PP_MSK_PSUM_MB, units = 0;
3392 unsigned char *bp;
3393
3394 result = read_mode_page(STp, PART_PAGE, 0);
3395 if (result) {
3396 DEBC_printk(STp, "Can't read partition mode page.\n");
3397 return result;
3398 }
3399 target_partition = 1;
3400 if (size < 0) {
3401 target_partition = 0;
3402 size = -size;
3403 }
3404
3405 /* The mode page is in the buffer. Let's modify it and write it. */
3406 bp = (STp->buffer)->b_data;
3407 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3408 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3409 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3410
3411 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3412
3413 if (scsi3) {
3414 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3415 if (needs_format && size == 0) {
3416 /* No need to write the mode page when clearing
3417 * partitioning
3418 */
3419 DEBC_printk(STp, "Formatting tape with one partition.\n");
3420 result = format_medium(STp, 0);
3421 goto out;
3422 }
3423 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3424 psd_cnt = 2;
3425 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3426 /* Use units scaling for large partitions if the device
3427 * suggests it and no precision lost. Required for IBM
3428 * TS1140/50 drives that don't support MB units.
3429 */
3430 if (size >= 1000 && (size % 1000) == 0) {
3431 size /= 1000;
3432 psum = PP_MSK_PSUM_UNITS;
3433 units = 9; /* GB */
3434 }
3435 }
3436 /* Try it anyway if too large to specify in MB */
3437 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3438 size /= 1000;
3439 psum = PP_MSK_PSUM_UNITS;
3440 units = 9; /* GB */
3441 }
3442 }
3443
3444 if (size >= 65535 || /* Does not fit into two bytes */
3445 (target_partition == 0 && psd_cnt < 2)) {
3446 result = -EINVAL;
3447 goto out;
3448 }
3449
3450 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3451 /* The second condition is for HP DDS which use only one partition size
3452 * descriptor
3453 */
3454 if (target_partition > 0 &&
3455 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3456 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3457 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3458 psdo += 2;
3459 }
3460 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3461
3462 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3463 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3464 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3465
3466 if (size == 0) {
3467 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3468 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3469 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3470 DEBC_printk(STp, "Formatting tape with one partition.\n");
3471 } else {
3472 bp[psdo] = (size >> 8) & 0xff;
3473 bp[psdo + 1] = size & 0xff;
3474 if (target_partition == 0)
3475 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3476 bp[pgo + 3] = 1;
3477 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3478 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3479 DEBC_printk(STp,
3480 "Formatting tape with two partitions (%i = %d MB).\n",
3481 target_partition, units > 0 ? size * 1000 : size);
3482 }
3483 bp[pgo + PP_OFF_PART_UNITS] = 0;
3484 bp[pgo + PP_OFF_RESERVED] = 0;
3485 if (size != 1 || units != 0) {
3486 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3487 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3488 bp[pgo + PP_OFF_PART_UNITS] = units;
3489 } else
3490 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3491 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3492 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3493
3494 result = write_mode_page(STp, PART_PAGE, 1);
3495
3496 if (!result && needs_format)
3497 result = format_medium(STp, 1);
3498
3499 if (result) {
3500 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3501 result = (-EIO);
3502 }
3503
3504out:
3505 return result;
3506}
3507
3508
3509
3510/* The ioctl command */
3511static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3512{
3513 void __user *p = (void __user *)arg;
3514 int i, cmd_nr, cmd_type, bt;
3515 int retval = 0;
3516 unsigned int blk;
3517 bool cmd_mtiocget;
3518 struct scsi_tape *STp = file->private_data;
3519 struct st_modedef *STm;
3520 struct st_partstat *STps;
3521
3522 if (mutex_lock_interruptible(&STp->lock))
3523 return -ERESTARTSYS;
3524
3525 DEB(
3526 if (debugging && !STp->in_use) {
3527 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3528 retval = (-EIO);
3529 goto out;
3530 } ) /* end DEB */
3531
3532 STm = &(STp->modes[STp->current_mode]);
3533 STps = &(STp->ps[STp->partition]);
3534
3535 /*
3536 * If we are in the middle of error recovery, don't let anyone
3537 * else try and use this device. Also, if error recovery fails, it
3538 * may try and take the device offline, in which case all further
3539 * access to the device is prohibited.
3540 */
3541 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3542 file->f_flags & O_NDELAY);
3543 if (retval)
3544 goto out;
3545
3546 cmd_type = _IOC_TYPE(cmd_in);
3547 cmd_nr = _IOC_NR(cmd_in);
3548
3549 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3550 struct mtop mtc;
3551
3552 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3553 retval = (-EINVAL);
3554 goto out;
3555 }
3556
3557 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3558 if (i) {
3559 retval = (-EFAULT);
3560 goto out;
3561 }
3562
3563 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3564 st_printk(KERN_WARNING, STp,
3565 "MTSETDRVBUFFER only allowed for root.\n");
3566 retval = (-EPERM);
3567 goto out;
3568 }
3569 if (!STm->defined &&
3570 (mtc.mt_op != MTSETDRVBUFFER &&
3571 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3572 retval = (-ENXIO);
3573 goto out;
3574 }
3575
3576 if (!STp->pos_unknown) {
3577
3578 if (STps->eof == ST_FM_HIT) {
3579 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3580 mtc.mt_op == MTEOM) {
3581 mtc.mt_count -= 1;
3582 if (STps->drv_file >= 0)
3583 STps->drv_file += 1;
3584 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3585 mtc.mt_count += 1;
3586 if (STps->drv_file >= 0)
3587 STps->drv_file += 1;
3588 }
3589 }
3590
3591 if (mtc.mt_op == MTSEEK) {
3592 /* Old position must be restored if partition will be
3593 changed */
3594 i = !STp->can_partitions ||
3595 (STp->new_partition != STp->partition);
3596 } else {
3597 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3598 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3599 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3600 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3602 mtc.mt_op == MTCOMPRESSION;
3603 }
3604 i = flush_buffer(STp, i);
3605 if (i < 0) {
3606 retval = i;
3607 goto out;
3608 }
3609 if (STps->rw == ST_WRITING &&
3610 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3611 mtc.mt_op == MTSEEK ||
3612 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3613 i = st_int_ioctl(STp, MTWEOF, 1);
3614 if (i < 0) {
3615 retval = i;
3616 goto out;
3617 }
3618 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3619 mtc.mt_count++;
3620 STps->rw = ST_IDLE;
3621 }
3622
3623 } else {
3624 /*
3625 * If there was a bus reset, block further access
3626 * to this device. If the user wants to rewind the tape,
3627 * then reset the flag and allow access again.
3628 */
3629 if (mtc.mt_op != MTREW &&
3630 mtc.mt_op != MTOFFL &&
3631 mtc.mt_op != MTLOAD &&
3632 mtc.mt_op != MTRETEN &&
3633 mtc.mt_op != MTERASE &&
3634 mtc.mt_op != MTSEEK &&
3635 mtc.mt_op != MTEOM) {
3636 retval = (-EIO);
3637 goto out;
3638 }
3639 reset_state(STp);
3640 /* remove this when the midlevel properly clears was_reset */
3641 STp->device->was_reset = 0;
3642 }
3643
3644 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3645 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3646 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3647 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3648
3649 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3650 do_door_lock(STp, 0); /* Ignore result! */
3651
3652 if (mtc.mt_op == MTSETDRVBUFFER &&
3653 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3654 retval = st_set_options(STp, mtc.mt_count);
3655 goto out;
3656 }
3657
3658 if (mtc.mt_op == MTSETPART) {
3659 if (!STp->can_partitions ||
3660 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3661 retval = (-EINVAL);
3662 goto out;
3663 }
3664 if (mtc.mt_count >= STp->nbr_partitions &&
3665 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3666 retval = (-EIO);
3667 goto out;
3668 }
3669 if (mtc.mt_count >= STp->nbr_partitions) {
3670 retval = (-EINVAL);
3671 goto out;
3672 }
3673 STp->new_partition = mtc.mt_count;
3674 retval = 0;
3675 goto out;
3676 }
3677
3678 if (mtc.mt_op == MTMKPART) {
3679 if (!STp->can_partitions) {
3680 retval = (-EINVAL);
3681 goto out;
3682 }
3683 i = do_load_unload(STp, file, 1);
3684 if (i < 0) {
3685 retval = i;
3686 goto out;
3687 }
3688 i = partition_tape(STp, mtc.mt_count);
3689 if (i < 0) {
3690 retval = i;
3691 goto out;
3692 }
3693 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3694 STp->ps[i].rw = ST_IDLE;
3695 STp->ps[i].at_sm = 0;
3696 STp->ps[i].last_block_valid = 0;
3697 }
3698 STp->partition = STp->new_partition = 0;
3699 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3700 STps->drv_block = STps->drv_file = 0;
3701 retval = 0;
3702 goto out;
3703 }
3704
3705 if (mtc.mt_op == MTSEEK) {
3706 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3707 if (!STp->can_partitions)
3708 STp->ps[0].rw = ST_IDLE;
3709 retval = i;
3710 goto out;
3711 }
3712
3713 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3714 retval = do_load_unload(STp, file, 0);
3715 goto out;
3716 }
3717
3718 if (mtc.mt_op == MTLOAD) {
3719 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3720 goto out;
3721 }
3722
3723 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3724 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3725 goto out;
3726 }
3727
3728 if (STp->can_partitions && STp->ready == ST_READY &&
3729 (i = switch_partition(STp)) < 0) {
3730 retval = i;
3731 goto out;
3732 }
3733
3734 if (mtc.mt_op == MTCOMPRESSION)
3735 retval = st_compression(STp, (mtc.mt_count & 1));
3736 else
3737 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3738 goto out;
3739 }
3740 if (!STm->defined) {
3741 retval = (-ENXIO);
3742 goto out;
3743 }
3744
3745 cmd_mtiocget = cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET);
3746
3747 if ((i = flush_buffer(STp, 0)) < 0) {
3748 if (cmd_mtiocget && STp->pos_unknown) {
3749 /* flush fails -> modify status accordingly */
3750 reset_state(STp);
3751 STp->pos_unknown = 1;
3752 } else { /* return error */
3753 retval = i;
3754 goto out;
3755 }
3756 } else { /* flush_buffer succeeds */
3757 if (STp->can_partitions) {
3758 i = switch_partition(STp);
3759 if (i < 0) {
3760 retval = i;
3761 goto out;
3762 }
3763 }
3764 }
3765
3766 if (cmd_mtiocget) {
3767 struct mtget mt_status;
3768
3769 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3770 retval = (-EINVAL);
3771 goto out;
3772 }
3773
3774 mt_status.mt_type = STp->tape_type;
3775 mt_status.mt_dsreg =
3776 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3777 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3778 mt_status.mt_blkno = STps->drv_block;
3779 mt_status.mt_fileno = STps->drv_file;
3780 if (STp->block_size != 0 && mt_status.mt_blkno >= 0) {
3781 if (STps->rw == ST_WRITING)
3782 mt_status.mt_blkno +=
3783 (STp->buffer)->buffer_bytes / STp->block_size;
3784 else if (STps->rw == ST_READING)
3785 mt_status.mt_blkno -=
3786 ((STp->buffer)->buffer_bytes +
3787 STp->block_size - 1) / STp->block_size;
3788 }
3789
3790 mt_status.mt_gstat = 0;
3791 if (STp->drv_write_prot)
3792 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3793 if (mt_status.mt_blkno == 0) {
3794 if (mt_status.mt_fileno == 0)
3795 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3796 else
3797 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3798 }
3799 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3800 mt_status.mt_resid = STp->partition;
3801 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3802 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3803 else if (STps->eof >= ST_EOM_OK)
3804 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3805 if (STp->density == 1)
3806 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3807 else if (STp->density == 2)
3808 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3809 else if (STp->density == 3)
3810 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3811 if (STp->ready == ST_READY)
3812 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3813 if (STp->ready == ST_NO_TAPE)
3814 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3815 if (STps->at_sm)
3816 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3817 if (STm->do_async_writes ||
3818 (STm->do_buffer_writes && STp->block_size != 0) ||
3819 STp->drv_buffer != 0)
3820 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3821 if (STp->cleaning_req)
3822 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3823
3824 retval = put_user_mtget(p, &mt_status);
3825 if (retval)
3826 goto out;
3827
3828 STp->recover_reg = 0; /* Clear after read */
3829 goto out;
3830 } /* End of MTIOCGET */
3831 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3832 struct mtpos mt_pos;
3833 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3834 retval = (-EINVAL);
3835 goto out;
3836 }
3837 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3838 retval = i;
3839 goto out;
3840 }
3841 mt_pos.mt_blkno = blk;
3842 retval = put_user_mtpos(p, &mt_pos);
3843 goto out;
3844 }
3845 mutex_unlock(&STp->lock);
3846
3847 switch (cmd_in) {
3848 case SG_IO:
3849 case SCSI_IOCTL_SEND_COMMAND:
3850 case CDROM_SEND_PACKET:
3851 if (!capable(CAP_SYS_RAWIO))
3852 return -EPERM;
3853 break;
3854 default:
3855 break;
3856 }
3857
3858 retval = scsi_ioctl(STp->device, file->f_mode & FMODE_WRITE, cmd_in, p);
3859 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
3860 /* unload */
3861 STp->rew_at_close = 0;
3862 STp->ready = ST_NO_TAPE;
3863 }
3864 return retval;
3865
3866 out:
3867 mutex_unlock(&STp->lock);
3868 return retval;
3869}
3870
3871#ifdef CONFIG_COMPAT
3872static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3873{
3874 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3875 switch (cmd_in) {
3876 case MTIOCPOS32:
3877 cmd_in = MTIOCPOS;
3878 break;
3879 case MTIOCGET32:
3880 cmd_in = MTIOCGET;
3881 break;
3882 }
3883
3884 return st_ioctl(file, cmd_in, arg);
3885}
3886#endif
3887
3888
3889
3890/* Try to allocate a new tape buffer. Calling function must not hold
3891 dev_arr_lock. */
3892static struct st_buffer *new_tape_buffer(int max_sg)
3893{
3894 struct st_buffer *tb;
3895
3896 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3897 if (!tb) {
3898 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3899 return NULL;
3900 }
3901 tb->frp_segs = 0;
3902 tb->use_sg = max_sg;
3903 tb->buffer_size = 0;
3904
3905 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3906 GFP_KERNEL);
3907 if (!tb->reserved_pages) {
3908 kfree(tb);
3909 return NULL;
3910 }
3911
3912 return tb;
3913}
3914
3915
3916/* Try to allocate enough space in the tape buffer */
3917#define ST_MAX_ORDER 6
3918
3919static int enlarge_buffer(struct st_buffer * STbuffer, int new_size)
3920{
3921 int segs, max_segs, b_size, order, got;
3922 gfp_t priority;
3923
3924 if (new_size <= STbuffer->buffer_size)
3925 return 1;
3926
3927 if (STbuffer->buffer_size <= PAGE_SIZE)
3928 normalize_buffer(STbuffer); /* Avoid extra segment */
3929
3930 max_segs = STbuffer->use_sg;
3931
3932 priority = GFP_KERNEL | __GFP_NOWARN;
3933
3934 if (STbuffer->cleared)
3935 priority |= __GFP_ZERO;
3936
3937 if (STbuffer->frp_segs) {
3938 order = STbuffer->reserved_page_order;
3939 b_size = PAGE_SIZE << order;
3940 } else {
3941 for (b_size = PAGE_SIZE, order = 0;
3942 order < ST_MAX_ORDER &&
3943 max_segs * (PAGE_SIZE << order) < new_size;
3944 order++, b_size *= 2)
3945 ; /* empty */
3946 STbuffer->reserved_page_order = order;
3947 }
3948 if (max_segs * (PAGE_SIZE << order) < new_size) {
3949 if (order == ST_MAX_ORDER)
3950 return 0;
3951 normalize_buffer(STbuffer);
3952 return enlarge_buffer(STbuffer, new_size);
3953 }
3954
3955 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3956 segs < max_segs && got < new_size;) {
3957 struct page *page;
3958
3959 page = alloc_pages(priority, order);
3960 if (!page) {
3961 DEB(STbuffer->buffer_size = got);
3962 normalize_buffer(STbuffer);
3963 return 0;
3964 }
3965
3966 STbuffer->frp_segs += 1;
3967 got += b_size;
3968 STbuffer->buffer_size = got;
3969 STbuffer->reserved_pages[segs] = page;
3970 segs++;
3971 }
3972 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3973
3974 return 1;
3975}
3976
3977
3978/* Make sure that no data from previous user is in the internal buffer */
3979static void clear_buffer(struct st_buffer * st_bp)
3980{
3981 int i;
3982
3983 for (i=0; i < st_bp->frp_segs; i++)
3984 memset(page_address(st_bp->reserved_pages[i]), 0,
3985 PAGE_SIZE << st_bp->reserved_page_order);
3986 st_bp->cleared = 1;
3987}
3988
3989
3990/* Release the extra buffer */
3991static void normalize_buffer(struct st_buffer * STbuffer)
3992{
3993 int i, order = STbuffer->reserved_page_order;
3994
3995 for (i = 0; i < STbuffer->frp_segs; i++) {
3996 __free_pages(STbuffer->reserved_pages[i], order);
3997 STbuffer->buffer_size -= (PAGE_SIZE << order);
3998 }
3999 STbuffer->frp_segs = 0;
4000 STbuffer->sg_segs = 0;
4001 STbuffer->reserved_page_order = 0;
4002 STbuffer->map_data.offset = 0;
4003}
4004
4005
4006/* Move data from the user buffer to the tape buffer. Returns zero (success) or
4007 negative error code. */
4008static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
4009{
4010 int i, cnt, res, offset;
4011 int length = PAGE_SIZE << st_bp->reserved_page_order;
4012
4013 for (i = 0, offset = st_bp->buffer_bytes;
4014 i < st_bp->frp_segs && offset >= length; i++)
4015 offset -= length;
4016 if (i == st_bp->frp_segs) { /* Should never happen */
4017 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4018 return (-EIO);
4019 }
4020 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4021 struct page *page = st_bp->reserved_pages[i];
4022 cnt = length - offset < do_count ? length - offset : do_count;
4023 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4024 if (res)
4025 return (-EFAULT);
4026 do_count -= cnt;
4027 st_bp->buffer_bytes += cnt;
4028 ubp += cnt;
4029 offset = 0;
4030 }
4031 if (do_count) /* Should never happen */
4032 return (-EIO);
4033
4034 return 0;
4035}
4036
4037
4038/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4039 negative error code. */
4040static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4041{
4042 int i, cnt, res, offset;
4043 int length = PAGE_SIZE << st_bp->reserved_page_order;
4044
4045 for (i = 0, offset = st_bp->read_pointer;
4046 i < st_bp->frp_segs && offset >= length; i++)
4047 offset -= length;
4048 if (i == st_bp->frp_segs) { /* Should never happen */
4049 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4050 return (-EIO);
4051 }
4052 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4053 struct page *page = st_bp->reserved_pages[i];
4054 cnt = length - offset < do_count ? length - offset : do_count;
4055 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4056 if (res)
4057 return (-EFAULT);
4058 do_count -= cnt;
4059 st_bp->buffer_bytes -= cnt;
4060 st_bp->read_pointer += cnt;
4061 ubp += cnt;
4062 offset = 0;
4063 }
4064 if (do_count) /* Should never happen */
4065 return (-EIO);
4066
4067 return 0;
4068}
4069
4070
4071/* Move data towards start of buffer */
4072static void move_buffer_data(struct st_buffer * st_bp, int offset)
4073{
4074 int src_seg, dst_seg, src_offset = 0, dst_offset;
4075 int count, total;
4076 int length = PAGE_SIZE << st_bp->reserved_page_order;
4077
4078 if (offset == 0)
4079 return;
4080
4081 total=st_bp->buffer_bytes - offset;
4082 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4083 src_offset = offset;
4084 if (src_offset < length)
4085 break;
4086 offset -= length;
4087 }
4088
4089 st_bp->buffer_bytes = st_bp->read_pointer = total;
4090 for (dst_seg=dst_offset=0; total > 0; ) {
4091 struct page *dpage = st_bp->reserved_pages[dst_seg];
4092 struct page *spage = st_bp->reserved_pages[src_seg];
4093
4094 count = min(length - dst_offset, length - src_offset);
4095 memmove(page_address(dpage) + dst_offset,
4096 page_address(spage) + src_offset, count);
4097 src_offset += count;
4098 if (src_offset >= length) {
4099 src_seg++;
4100 src_offset = 0;
4101 }
4102 dst_offset += count;
4103 if (dst_offset >= length) {
4104 dst_seg++;
4105 dst_offset = 0;
4106 }
4107 total -= count;
4108 }
4109}
4110
4111/* Validate the options from command line or module parameters */
4112static void validate_options(void)
4113{
4114 if (buffer_kbs > 0)
4115 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4116 if (max_sg_segs >= ST_FIRST_SG)
4117 st_max_sg_segs = max_sg_segs;
4118}
4119
4120#ifndef MODULE
4121/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4122 */
4123static int __init st_setup(char *str)
4124{
4125 int i, len, ints[5];
4126 char *stp;
4127
4128 stp = get_options(str, ARRAY_SIZE(ints), ints);
4129
4130 if (ints[0] > 0) {
4131 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4132 if (parms[i].val)
4133 *parms[i].val = ints[i + 1];
4134 } else {
4135 while (stp != NULL) {
4136 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4137 len = strlen(parms[i].name);
4138 if (!strncmp(stp, parms[i].name, len) &&
4139 (*(stp + len) == ':' || *(stp + len) == '=')) {
4140 if (parms[i].val)
4141 *parms[i].val =
4142 simple_strtoul(stp + len + 1, NULL, 0);
4143 else
4144 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4145 parms[i].name);
4146 break;
4147 }
4148 }
4149 if (i >= ARRAY_SIZE(parms))
4150 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4151 stp);
4152 stp = strchr(stp, ',');
4153 if (stp)
4154 stp++;
4155 }
4156 }
4157
4158 validate_options();
4159
4160 return 1;
4161}
4162
4163__setup("st=", st_setup);
4164
4165#endif
4166
4167static const struct file_operations st_fops =
4168{
4169 .owner = THIS_MODULE,
4170 .read = st_read,
4171 .write = st_write,
4172 .unlocked_ioctl = st_ioctl,
4173#ifdef CONFIG_COMPAT
4174 .compat_ioctl = st_compat_ioctl,
4175#endif
4176 .open = st_open,
4177 .flush = st_flush,
4178 .release = st_release,
4179 .llseek = noop_llseek,
4180};
4181
4182static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4183{
4184 int i, error;
4185 dev_t cdev_devno;
4186 struct cdev *cdev;
4187 struct device *dev;
4188 struct st_modedef *STm = &(tape->modes[mode]);
4189 char name[10];
4190 int dev_num = tape->index;
4191
4192 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4193
4194 cdev = cdev_alloc();
4195 if (!cdev) {
4196 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4197 error = -ENOMEM;
4198 goto out;
4199 }
4200 cdev->owner = THIS_MODULE;
4201 cdev->ops = &st_fops;
4202 STm->cdevs[rew] = cdev;
4203
4204 error = cdev_add(cdev, cdev_devno, 1);
4205 if (error) {
4206 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4207 rew ? "non" : "auto", mode);
4208 pr_err("st%d: Device not attached.\n", dev_num);
4209 goto out_free;
4210 }
4211
4212 i = mode << (4 - ST_NBR_MODE_BITS);
4213 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4214 tape->name, st_formats[i]);
4215
4216 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4217 cdev_devno, &tape->modes[mode], "%s", name);
4218 if (IS_ERR(dev)) {
4219 pr_err("st%d: device_create failed\n", dev_num);
4220 error = PTR_ERR(dev);
4221 goto out_free;
4222 }
4223
4224 STm->devs[rew] = dev;
4225
4226 return 0;
4227out_free:
4228 cdev_del(STm->cdevs[rew]);
4229out:
4230 STm->cdevs[rew] = NULL;
4231 STm->devs[rew] = NULL;
4232 return error;
4233}
4234
4235static int create_cdevs(struct scsi_tape *tape)
4236{
4237 int mode, error;
4238 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4239 error = create_one_cdev(tape, mode, 0);
4240 if (error)
4241 return error;
4242 error = create_one_cdev(tape, mode, 1);
4243 if (error)
4244 return error;
4245 }
4246
4247 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4248 &tape->modes[0].devs[0]->kobj, "tape");
4249}
4250
4251static void remove_cdevs(struct scsi_tape *tape)
4252{
4253 int mode, rew;
4254 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4255 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4256 struct st_modedef *STm = &(tape->modes[mode]);
4257 for (rew = 0; rew < 2; rew++) {
4258 if (STm->cdevs[rew])
4259 cdev_del(STm->cdevs[rew]);
4260 if (STm->devs[rew])
4261 device_unregister(STm->devs[rew]);
4262 }
4263 }
4264}
4265
4266static int st_probe(struct device *dev)
4267{
4268 struct scsi_device *SDp = to_scsi_device(dev);
4269 struct scsi_tape *tpnt = NULL;
4270 struct st_modedef *STm;
4271 struct st_partstat *STps;
4272 struct st_buffer *buffer;
4273 int i, error;
4274
4275 if (SDp->type != TYPE_TAPE)
4276 return -ENODEV;
4277 if (st_incompatible(SDp)) {
4278 sdev_printk(KERN_INFO, SDp,
4279 "OnStream tapes are no longer supported;\n");
4280 sdev_printk(KERN_INFO, SDp,
4281 "please mail to linux-scsi@vger.kernel.org.\n");
4282 return -ENODEV;
4283 }
4284
4285 scsi_autopm_get_device(SDp);
4286 i = queue_max_segments(SDp->request_queue);
4287 if (st_max_sg_segs < i)
4288 i = st_max_sg_segs;
4289 buffer = new_tape_buffer(i);
4290 if (buffer == NULL) {
4291 sdev_printk(KERN_ERR, SDp,
4292 "st: Can't allocate new tape buffer. "
4293 "Device not attached.\n");
4294 goto out;
4295 }
4296
4297 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4298 if (tpnt == NULL) {
4299 sdev_printk(KERN_ERR, SDp,
4300 "st: Can't allocate device descriptor.\n");
4301 goto out_buffer_free;
4302 }
4303 kref_init(&tpnt->kref);
4304
4305 tpnt->device = SDp;
4306 if (SDp->scsi_level <= 2)
4307 tpnt->tape_type = MT_ISSCSI1;
4308 else
4309 tpnt->tape_type = MT_ISSCSI2;
4310
4311 tpnt->buffer = buffer;
4312 tpnt->buffer->last_SRpnt = NULL;
4313
4314 tpnt->inited = 0;
4315 tpnt->dirty = 0;
4316 tpnt->in_use = 0;
4317 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4318 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4319 tpnt->density = 0;
4320 tpnt->do_auto_lock = ST_AUTO_LOCK;
4321 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4322 tpnt->can_partitions = 0;
4323 tpnt->two_fm = ST_TWO_FM;
4324 tpnt->fast_mteom = ST_FAST_MTEOM;
4325 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4326 tpnt->sili = ST_SILI;
4327 tpnt->immediate = ST_NOWAIT;
4328 tpnt->immediate_filemark = 0;
4329 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4330 tpnt->partition = 0;
4331 tpnt->new_partition = 0;
4332 tpnt->nbr_partitions = 0;
4333 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4334 tpnt->long_timeout = ST_LONG_TIMEOUT;
4335 tpnt->try_dio = try_direct_io;
4336 tpnt->first_tur = 1;
4337
4338 for (i = 0; i < ST_NBR_MODES; i++) {
4339 STm = &(tpnt->modes[i]);
4340 STm->defined = 0;
4341 STm->sysv = ST_SYSV;
4342 STm->defaults_for_writes = 0;
4343 STm->do_async_writes = ST_ASYNC_WRITES;
4344 STm->do_buffer_writes = ST_BUFFER_WRITES;
4345 STm->do_read_ahead = ST_READ_AHEAD;
4346 STm->default_compression = ST_DONT_TOUCH;
4347 STm->default_blksize = (-1); /* No forced size */
4348 STm->default_density = (-1); /* No forced density */
4349 STm->tape = tpnt;
4350 }
4351
4352 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4353 STps = &(tpnt->ps[i]);
4354 STps->rw = ST_IDLE;
4355 STps->eof = ST_NOEOF;
4356 STps->at_sm = 0;
4357 STps->last_block_valid = 0;
4358 STps->drv_block = (-1);
4359 STps->drv_file = (-1);
4360 }
4361
4362 tpnt->current_mode = 0;
4363 tpnt->modes[0].defined = 1;
4364
4365 tpnt->density_changed = tpnt->compression_changed =
4366 tpnt->blksize_changed = 0;
4367 mutex_init(&tpnt->lock);
4368
4369 idr_preload(GFP_KERNEL);
4370 spin_lock(&st_index_lock);
4371 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4372 spin_unlock(&st_index_lock);
4373 idr_preload_end();
4374 if (error < 0) {
4375 pr_warn("st: idr allocation failed: %d\n", error);
4376 goto out_free_tape;
4377 }
4378 tpnt->index = error;
4379 sprintf(tpnt->name, "st%d", tpnt->index);
4380 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4381 if (tpnt->stats == NULL) {
4382 sdev_printk(KERN_ERR, SDp,
4383 "st: Can't allocate statistics.\n");
4384 goto out_idr_remove;
4385 }
4386
4387 dev_set_drvdata(dev, tpnt);
4388
4389
4390 error = create_cdevs(tpnt);
4391 if (error)
4392 goto out_remove_devs;
4393 scsi_autopm_put_device(SDp);
4394
4395 sdev_printk(KERN_NOTICE, SDp,
4396 "Attached scsi tape %s\n", tpnt->name);
4397 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4398 tpnt->name, tpnt->try_dio ? "yes" : "no",
4399 queue_dma_alignment(SDp->request_queue) + 1);
4400
4401 return 0;
4402
4403out_remove_devs:
4404 remove_cdevs(tpnt);
4405 kfree(tpnt->stats);
4406out_idr_remove:
4407 spin_lock(&st_index_lock);
4408 idr_remove(&st_index_idr, tpnt->index);
4409 spin_unlock(&st_index_lock);
4410out_free_tape:
4411 kfree(tpnt);
4412out_buffer_free:
4413 kfree(buffer);
4414out:
4415 scsi_autopm_put_device(SDp);
4416 return -ENODEV;
4417};
4418
4419
4420static int st_remove(struct device *dev)
4421{
4422 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4423 int index = tpnt->index;
4424
4425 scsi_autopm_get_device(to_scsi_device(dev));
4426 remove_cdevs(tpnt);
4427
4428 mutex_lock(&st_ref_mutex);
4429 kref_put(&tpnt->kref, scsi_tape_release);
4430 mutex_unlock(&st_ref_mutex);
4431 spin_lock(&st_index_lock);
4432 idr_remove(&st_index_idr, index);
4433 spin_unlock(&st_index_lock);
4434 return 0;
4435}
4436
4437/**
4438 * scsi_tape_release - Called to free the Scsi_Tape structure
4439 * @kref: pointer to embedded kref
4440 *
4441 * st_ref_mutex must be held entering this routine. Because it is
4442 * called on last put, you should always use the scsi_tape_get()
4443 * scsi_tape_put() helpers which manipulate the semaphore directly
4444 * and never do a direct kref_put().
4445 **/
4446static void scsi_tape_release(struct kref *kref)
4447{
4448 struct scsi_tape *tpnt = to_scsi_tape(kref);
4449
4450 tpnt->device = NULL;
4451
4452 if (tpnt->buffer) {
4453 normalize_buffer(tpnt->buffer);
4454 kfree(tpnt->buffer->reserved_pages);
4455 kfree(tpnt->buffer);
4456 }
4457
4458 kfree(tpnt->stats);
4459 kfree(tpnt);
4460 return;
4461}
4462
4463static const struct class st_sysfs_class = {
4464 .name = "scsi_tape",
4465 .dev_groups = st_dev_groups,
4466};
4467
4468static int __init init_st(void)
4469{
4470 int err;
4471
4472 validate_options();
4473
4474 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4475 verstr, st_fixed_buffer_size, st_max_sg_segs);
4476
4477 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4478 if (debugging) {
4479 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4480 debugging);
4481 }
4482
4483 err = class_register(&st_sysfs_class);
4484 if (err) {
4485 pr_err("Unable register sysfs class for SCSI tapes\n");
4486 return err;
4487 }
4488
4489 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4490 ST_MAX_TAPE_ENTRIES, "st");
4491 if (err) {
4492 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4493 SCSI_TAPE_MAJOR);
4494 goto err_class;
4495 }
4496
4497 err = scsi_register_driver(&st_template.gendrv);
4498 if (err)
4499 goto err_chrdev;
4500
4501 return 0;
4502
4503err_chrdev:
4504 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4505 ST_MAX_TAPE_ENTRIES);
4506err_class:
4507 class_unregister(&st_sysfs_class);
4508 return err;
4509}
4510
4511static void __exit exit_st(void)
4512{
4513 scsi_unregister_driver(&st_template.gendrv);
4514 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4515 ST_MAX_TAPE_ENTRIES);
4516 class_unregister(&st_sysfs_class);
4517 idr_destroy(&st_index_idr);
4518 printk(KERN_INFO "st: Unloaded.\n");
4519}
4520
4521module_init(init_st);
4522module_exit(exit_st);
4523
4524
4525/* The sysfs driver interface. Read-only at the moment */
4526static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4527{
4528 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4529}
4530static DRIVER_ATTR_RO(try_direct_io);
4531
4532static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4533{
4534 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4535}
4536static DRIVER_ATTR_RO(fixed_buffer_size);
4537
4538static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4539{
4540 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4541}
4542static DRIVER_ATTR_RO(max_sg_segs);
4543
4544static ssize_t version_show(struct device_driver *ddd, char *buf)
4545{
4546 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4547}
4548static DRIVER_ATTR_RO(version);
4549
4550#if DEBUG
4551static ssize_t debug_flag_store(struct device_driver *ddp,
4552 const char *buf, size_t count)
4553{
4554/* We only care what the first byte of the data is the rest is unused.
4555 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4556 * other values have -EINVAL returned if they are passed in.
4557 */
4558 if (count > 0) {
4559 if (buf[0] == '0') {
4560 debugging = NO_DEBUG;
4561 return count;
4562 } else if (buf[0] == '1') {
4563 debugging = 1;
4564 return count;
4565 }
4566 }
4567 return -EINVAL;
4568}
4569
4570static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4571{
4572 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4573}
4574static DRIVER_ATTR_RW(debug_flag);
4575#endif
4576
4577static struct attribute *st_drv_attrs[] = {
4578 &driver_attr_try_direct_io.attr,
4579 &driver_attr_fixed_buffer_size.attr,
4580 &driver_attr_max_sg_segs.attr,
4581 &driver_attr_version.attr,
4582#if DEBUG
4583 &driver_attr_debug_flag.attr,
4584#endif
4585 NULL,
4586};
4587ATTRIBUTE_GROUPS(st_drv);
4588
4589/* The sysfs simple class interface */
4590static ssize_t
4591defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4592{
4593 struct st_modedef *STm = dev_get_drvdata(dev);
4594 ssize_t l = 0;
4595
4596 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4597 return l;
4598}
4599static DEVICE_ATTR_RO(defined);
4600
4601static ssize_t
4602default_blksize_show(struct device *dev, struct device_attribute *attr,
4603 char *buf)
4604{
4605 struct st_modedef *STm = dev_get_drvdata(dev);
4606 ssize_t l = 0;
4607
4608 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4609 return l;
4610}
4611static DEVICE_ATTR_RO(default_blksize);
4612
4613static ssize_t
4614default_density_show(struct device *dev, struct device_attribute *attr,
4615 char *buf)
4616{
4617 struct st_modedef *STm = dev_get_drvdata(dev);
4618 ssize_t l = 0;
4619 char *fmt;
4620
4621 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4622 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4623 return l;
4624}
4625static DEVICE_ATTR_RO(default_density);
4626
4627static ssize_t
4628default_compression_show(struct device *dev, struct device_attribute *attr,
4629 char *buf)
4630{
4631 struct st_modedef *STm = dev_get_drvdata(dev);
4632 ssize_t l = 0;
4633
4634 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4635 return l;
4636}
4637static DEVICE_ATTR_RO(default_compression);
4638
4639static ssize_t
4640options_show(struct device *dev, struct device_attribute *attr, char *buf)
4641{
4642 struct st_modedef *STm = dev_get_drvdata(dev);
4643 struct scsi_tape *STp = STm->tape;
4644 int options;
4645 ssize_t l = 0;
4646
4647 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4648 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4649 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4650 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4651 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4652 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4653 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4654 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4655 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4656 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4657 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4658 options |= STm->sysv ? MT_ST_SYSV : 0;
4659 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4660 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4661 options |= STp->sili ? MT_ST_SILI : 0;
4662
4663 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4664 return l;
4665}
4666static DEVICE_ATTR_RO(options);
4667
4668/* Support for tape stats */
4669
4670/**
4671 * read_cnt_show - return read count - count of reads made from tape drive
4672 * @dev: struct device
4673 * @attr: attribute structure
4674 * @buf: buffer to return formatted data in
4675 */
4676static ssize_t read_cnt_show(struct device *dev,
4677 struct device_attribute *attr, char *buf)
4678{
4679 struct st_modedef *STm = dev_get_drvdata(dev);
4680
4681 return sprintf(buf, "%lld",
4682 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4683}
4684static DEVICE_ATTR_RO(read_cnt);
4685
4686/**
4687 * read_byte_cnt_show - return read byte count - tape drives
4688 * may use blocks less than 512 bytes this gives the raw byte count of
4689 * of data read from the tape drive.
4690 * @dev: struct device
4691 * @attr: attribute structure
4692 * @buf: buffer to return formatted data in
4693 */
4694static ssize_t read_byte_cnt_show(struct device *dev,
4695 struct device_attribute *attr, char *buf)
4696{
4697 struct st_modedef *STm = dev_get_drvdata(dev);
4698
4699 return sprintf(buf, "%lld",
4700 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4701}
4702static DEVICE_ATTR_RO(read_byte_cnt);
4703
4704/**
4705 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4706 * @dev: struct device
4707 * @attr: attribute structure
4708 * @buf: buffer to return formatted data in
4709 */
4710static ssize_t read_ns_show(struct device *dev,
4711 struct device_attribute *attr, char *buf)
4712{
4713 struct st_modedef *STm = dev_get_drvdata(dev);
4714
4715 return sprintf(buf, "%lld",
4716 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4717}
4718static DEVICE_ATTR_RO(read_ns);
4719
4720/**
4721 * write_cnt_show - write count - number of user calls
4722 * to write(2) that have written data to tape.
4723 * @dev: struct device
4724 * @attr: attribute structure
4725 * @buf: buffer to return formatted data in
4726 */
4727static ssize_t write_cnt_show(struct device *dev,
4728 struct device_attribute *attr, char *buf)
4729{
4730 struct st_modedef *STm = dev_get_drvdata(dev);
4731
4732 return sprintf(buf, "%lld",
4733 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4734}
4735static DEVICE_ATTR_RO(write_cnt);
4736
4737/**
4738 * write_byte_cnt_show - write byte count - raw count of
4739 * bytes written to tape.
4740 * @dev: struct device
4741 * @attr: attribute structure
4742 * @buf: buffer to return formatted data in
4743 */
4744static ssize_t write_byte_cnt_show(struct device *dev,
4745 struct device_attribute *attr, char *buf)
4746{
4747 struct st_modedef *STm = dev_get_drvdata(dev);
4748
4749 return sprintf(buf, "%lld",
4750 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4751}
4752static DEVICE_ATTR_RO(write_byte_cnt);
4753
4754/**
4755 * write_ns_show - write ns - number of nanoseconds waiting on write
4756 * requests to complete.
4757 * @dev: struct device
4758 * @attr: attribute structure
4759 * @buf: buffer to return formatted data in
4760 */
4761static ssize_t write_ns_show(struct device *dev,
4762 struct device_attribute *attr, char *buf)
4763{
4764 struct st_modedef *STm = dev_get_drvdata(dev);
4765
4766 return sprintf(buf, "%lld",
4767 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4768}
4769static DEVICE_ATTR_RO(write_ns);
4770
4771/**
4772 * in_flight_show - number of I/Os currently in flight -
4773 * in most cases this will be either 0 or 1. It may be higher if someone
4774 * has also issued other SCSI commands such as via an ioctl.
4775 * @dev: struct device
4776 * @attr: attribute structure
4777 * @buf: buffer to return formatted data in
4778 */
4779static ssize_t in_flight_show(struct device *dev,
4780 struct device_attribute *attr, char *buf)
4781{
4782 struct st_modedef *STm = dev_get_drvdata(dev);
4783
4784 return sprintf(buf, "%lld",
4785 (long long)atomic64_read(&STm->tape->stats->in_flight));
4786}
4787static DEVICE_ATTR_RO(in_flight);
4788
4789/**
4790 * io_ns_show - io wait ns - this is the number of ns spent
4791 * waiting on all I/O to complete. This includes tape movement commands
4792 * such as rewinding, seeking to end of file or tape, it also includes
4793 * read and write. To determine the time spent on tape movement
4794 * subtract the read and write ns from this value.
4795 * @dev: struct device
4796 * @attr: attribute structure
4797 * @buf: buffer to return formatted data in
4798 */
4799static ssize_t io_ns_show(struct device *dev,
4800 struct device_attribute *attr, char *buf)
4801{
4802 struct st_modedef *STm = dev_get_drvdata(dev);
4803
4804 return sprintf(buf, "%lld",
4805 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4806}
4807static DEVICE_ATTR_RO(io_ns);
4808
4809/**
4810 * other_cnt_show - other io count - this is the number of
4811 * I/O requests other than read and write requests.
4812 * Typically these are tape movement requests but will include driver
4813 * tape movement. This includes only requests issued by the st driver.
4814 * @dev: struct device
4815 * @attr: attribute structure
4816 * @buf: buffer to return formatted data in
4817 */
4818static ssize_t other_cnt_show(struct device *dev,
4819 struct device_attribute *attr, char *buf)
4820{
4821 struct st_modedef *STm = dev_get_drvdata(dev);
4822
4823 return sprintf(buf, "%lld",
4824 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4825}
4826static DEVICE_ATTR_RO(other_cnt);
4827
4828/**
4829 * resid_cnt_show - A count of the number of times we get a residual
4830 * count - this should indicate someone issuing reads larger than the
4831 * block size on tape.
4832 * @dev: struct device
4833 * @attr: attribute structure
4834 * @buf: buffer to return formatted data in
4835 */
4836static ssize_t resid_cnt_show(struct device *dev,
4837 struct device_attribute *attr, char *buf)
4838{
4839 struct st_modedef *STm = dev_get_drvdata(dev);
4840
4841 return sprintf(buf, "%lld",
4842 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4843}
4844static DEVICE_ATTR_RO(resid_cnt);
4845
4846static struct attribute *st_dev_attrs[] = {
4847 &dev_attr_defined.attr,
4848 &dev_attr_default_blksize.attr,
4849 &dev_attr_default_density.attr,
4850 &dev_attr_default_compression.attr,
4851 &dev_attr_options.attr,
4852 NULL,
4853};
4854
4855static struct attribute *st_stats_attrs[] = {
4856 &dev_attr_read_cnt.attr,
4857 &dev_attr_read_byte_cnt.attr,
4858 &dev_attr_read_ns.attr,
4859 &dev_attr_write_cnt.attr,
4860 &dev_attr_write_byte_cnt.attr,
4861 &dev_attr_write_ns.attr,
4862 &dev_attr_in_flight.attr,
4863 &dev_attr_io_ns.attr,
4864 &dev_attr_other_cnt.attr,
4865 &dev_attr_resid_cnt.attr,
4866 NULL,
4867};
4868
4869static struct attribute_group stats_group = {
4870 .name = "stats",
4871 .attrs = st_stats_attrs,
4872};
4873
4874static struct attribute_group st_group = {
4875 .attrs = st_dev_attrs,
4876};
4877
4878static const struct attribute_group *st_dev_groups[] = {
4879 &st_group,
4880 &stats_group,
4881 NULL,
4882};
4883
4884/* The following functions may be useful for a larger audience. */
4885static int sgl_map_user_pages(struct st_buffer *STbp,
4886 const unsigned int max_pages, unsigned long uaddr,
4887 size_t count, int rw)
4888{
4889 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4890 unsigned long start = uaddr >> PAGE_SHIFT;
4891 const int nr_pages = end - start;
4892 int res, i;
4893 struct page **pages;
4894 struct rq_map_data *mdata = &STbp->map_data;
4895
4896 /* User attempted Overflow! */
4897 if ((uaddr + count) < uaddr)
4898 return -EINVAL;
4899
4900 /* Too big */
4901 if (nr_pages > max_pages)
4902 return -ENOMEM;
4903
4904 /* Hmm? */
4905 if (count == 0)
4906 return 0;
4907
4908 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4909 if (pages == NULL)
4910 return -ENOMEM;
4911
4912 /* Try to fault in all of the necessary pages */
4913 /* rw==READ means read from drive, write into memory area */
4914 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4915 pages);
4916
4917 /* Errors and no page mapped should return here */
4918 if (res < nr_pages)
4919 goto out_unmap;
4920
4921 for (i=0; i < nr_pages; i++) {
4922 /* FIXME: flush superflous for rw==READ,
4923 * probably wrong function for rw==WRITE
4924 */
4925 flush_dcache_page(pages[i]);
4926 }
4927
4928 mdata->offset = uaddr & ~PAGE_MASK;
4929 STbp->mapped_pages = pages;
4930
4931 return nr_pages;
4932 out_unmap:
4933 if (res > 0) {
4934 unpin_user_pages(pages, res);
4935 res = 0;
4936 }
4937 kfree(pages);
4938 return res;
4939}
4940
4941
4942/* And unmap them... */
4943static int sgl_unmap_user_pages(struct st_buffer *STbp,
4944 const unsigned int nr_pages, int dirtied)
4945{
4946 /* FIXME: cache flush missing for rw==READ */
4947 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied);
4948
4949 kfree(STbp->mapped_pages);
4950 STbp->mapped_pages = NULL;
4951
4952 return 0;
4953}