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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 - 2016 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 = "20160209";
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 <linux/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 1
60#define NO_DEBUG 0
61
62#define ST_DEB_MSG KERN_NOTICE
63#if DEBUG
64/* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
67#define DEB(a) a
68#define DEBC(a) if (debugging) { a ; }
69#else
70#define DEB(a)
71#define DEBC(a)
72#endif
73
74#define ST_KILOBYTE 1024
75
76#include "st_options.h"
77#include "st.h"
78
79static int buffer_kbs;
80static int max_sg_segs;
81static int try_direct_io = TRY_DIRECT_IO;
82static int try_rdio = 1;
83static int try_wdio = 1;
84static int debug_flag;
85
86static struct class st_sysfs_class;
87static const struct attribute_group *st_dev_groups[];
88static const struct attribute_group *st_drv_groups[];
89
90MODULE_AUTHOR("Kai Makisara");
91MODULE_DESCRIPTION("SCSI tape (st) driver");
92MODULE_LICENSE("GPL");
93MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
95
96/* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100module_param_named(buffer_kbs, buffer_kbs, int, 0);
101MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102module_param_named(max_sg_segs, max_sg_segs, int, 0);
103MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104module_param_named(try_direct_io, try_direct_io, int, 0);
105MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106module_param_named(debug_flag, debug_flag, int, 0);
107MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
109
110/* Extra parameters for testing */
111module_param_named(try_rdio, try_rdio, int, 0);
112MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113module_param_named(try_wdio, try_wdio, int, 0);
114MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116#ifndef MODULE
117static int write_threshold_kbs; /* retained for compatibility */
118static struct st_dev_parm {
119 char *name;
120 int *val;
121} parms[] __initdata = {
122 {
123 "buffer_kbs", &buffer_kbs
124 },
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
127 },
128 {
129 "max_sg_segs", NULL
130 },
131 {
132 "try_direct_io", &try_direct_io
133 },
134 {
135 "debug_flag", &debug_flag
136 }
137};
138#endif
139
140/* Restrict the number of modes so that names for all are assigned */
141#if ST_NBR_MODES > 16
142#error "Maximum number of modes is 16"
143#endif
144/* Bit reversed order to get same names for same minors with all
145 mode counts */
146static const char *st_formats[] = {
147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
149
150/* The default definitions have been moved to st_options.h */
151
152#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
153
154/* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
158#endif
159
160static int debugging = DEBUG;
161
162#define MAX_RETRIES 0
163#define MAX_WRITE_RETRIES 0
164#define MAX_READY_RETRIES 0
165#define NO_TAPE NOT_READY
166
167#define ST_TIMEOUT (900 * HZ)
168#define ST_LONG_TIMEOUT (14000 * HZ)
169
170/* Remove mode bits and auto-rewind bit (7) */
171#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
174
175/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
178
179/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
180 24 bits) */
181#define SET_DENS_AND_BLK 0x10001
182
183static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184static int st_max_sg_segs = ST_MAX_SG;
185
186static int modes_defined;
187
188static int enlarge_buffer(struct st_buffer *, int, int);
189static void clear_buffer(struct st_buffer *);
190static void normalize_buffer(struct st_buffer *);
191static int append_to_buffer(const char __user *, struct st_buffer *, int);
192static int from_buffer(struct st_buffer *, char __user *, int);
193static void move_buffer_data(struct st_buffer *, int);
194
195static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
196 unsigned long, size_t, int);
197static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
198
199static int st_probe(struct device *);
200static int st_remove(struct device *);
201
202static struct scsi_driver st_template = {
203 .gendrv = {
204 .name = "st",
205 .owner = THIS_MODULE,
206 .probe = st_probe,
207 .remove = st_remove,
208 .groups = st_drv_groups,
209 },
210};
211
212static int st_compression(struct scsi_tape *, int);
213
214static int find_partition(struct scsi_tape *);
215static int switch_partition(struct scsi_tape *);
216
217static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
219static void scsi_tape_release(struct kref *);
220
221#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
223static DEFINE_MUTEX(st_ref_mutex);
224static DEFINE_SPINLOCK(st_index_lock);
225static DEFINE_SPINLOCK(st_use_lock);
226static DEFINE_IDR(st_index_idr);
227
228
229
230#include "osst_detect.h"
231#ifndef SIGS_FROM_OSST
232#define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
238#endif
239
240static struct scsi_tape *scsi_tape_get(int dev)
241{
242 struct scsi_tape *STp = NULL;
243
244 mutex_lock(&st_ref_mutex);
245 spin_lock(&st_index_lock);
246
247 STp = idr_find(&st_index_idr, dev);
248 if (!STp) goto out;
249
250 kref_get(&STp->kref);
251
252 if (!STp->device)
253 goto out_put;
254
255 if (scsi_device_get(STp->device))
256 goto out_put;
257
258 goto out;
259
260out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263out:
264 spin_unlock(&st_index_lock);
265 mutex_unlock(&st_ref_mutex);
266 return STp;
267}
268
269static void scsi_tape_put(struct scsi_tape *STp)
270{
271 struct scsi_device *sdev = STp->device;
272
273 mutex_lock(&st_ref_mutex);
274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
276 mutex_unlock(&st_ref_mutex);
277}
278
279struct st_reject_data {
280 char *vendor;
281 char *model;
282 char *rev;
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
284};
285
286static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
288 SIGS_FROM_OSST,
289 {NULL, }};
290
291/* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293static char * st_incompatible(struct scsi_device* SDp)
294{
295 struct st_reject_data *rp;
296
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
301 if (rp->driver_hint)
302 return rp->driver_hint;
303 else
304 return "unknown";
305 }
306 return NULL;
307}
308
309
310static inline char *tape_name(struct scsi_tape *tape)
311{
312 return tape->disk->disk_name;
313}
314
315#define st_printk(prefix, t, fmt, a...) \
316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
317#ifdef DEBUG
318#define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
320#else
321#define DEBC_printk(t, fmt, a...)
322#endif
323
324static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
325{
326 const u8 *ucp;
327 const u8 *sense = SRpnt->sense;
328
329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
331 s->flags = 0;
332
333 if (s->have_sense) {
334 s->deferred = 0;
335 s->remainder_valid =
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
338 case 0x71:
339 s->deferred = 1;
340 case 0x70:
341 s->fixed_format = 1;
342 s->flags = sense[2] & 0xe0;
343 break;
344 case 0x73:
345 s->deferred = 1;
346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353}
354
355
356/* Convert the result to success code */
357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
358{
359 int result = SRpnt->result;
360 u8 scode;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
369 st_analyze_sense(SRpnt, cmdstatp);
370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
382 if (cmdstatp->have_sense)
383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
399
400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422#if ST_RECOVERED_WRITE_FATAL
423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
425#endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
430 DEB(
431 if (debugging) {
432 if (SRpnt->cmd[0] == READ_6)
433 stp = "read";
434 else if (SRpnt->cmd[0] == WRITE_6)
435 stp = "write";
436 else
437 stp = "ioctl";
438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447}
448
449static struct st_request *st_allocate_request(struct scsi_tape *stp)
450{
451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
466}
467
468static void st_release_request(struct st_request *streq)
469{
470 kfree(streq);
471}
472
473static void st_do_stats(struct scsi_tape *STp, struct request *req)
474{
475 ktime_t now;
476
477 now = ktime_get();
478 if (req->cmd[0] == WRITE_6) {
479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
483 if (req->errors) {
484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
492 } else if (req->cmd[0] == READ_6) {
493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
497 if (req->errors) {
498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512}
513
514static void st_scsi_execute_end(struct request *req, int uptodate)
515{
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_tape *STp = SRpnt->stp;
518 struct bio *tmp;
519
520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
521 STp->buffer->cmdstat.residual = req->resid_len;
522
523 st_do_stats(STp, req);
524
525 tmp = SRpnt->bio;
526 if (SRpnt->waiting)
527 complete(SRpnt->waiting);
528
529 blk_rq_unmap_user(tmp);
530 __blk_put_request(req->q, req);
531}
532
533static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
534 int data_direction, void *buffer, unsigned bufflen,
535 int timeout, int retries)
536{
537 struct request *req;
538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
539 int err = 0;
540 int write = (data_direction == DMA_TO_DEVICE);
541 struct scsi_tape *STp = SRpnt->stp;
542
543 req = blk_get_request(SRpnt->stp->device->request_queue, write,
544 GFP_KERNEL);
545 if (IS_ERR(req))
546 return DRIVER_ERROR << 24;
547
548 blk_rq_set_block_pc(req);
549 req->rq_flags |= RQF_QUIET;
550
551 mdata->null_mapped = 1;
552
553 if (bufflen) {
554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
555 GFP_KERNEL);
556 if (err) {
557 blk_put_request(req);
558 return DRIVER_ERROR << 24;
559 }
560 }
561
562 atomic64_inc(&STp->stats->in_flight);
563 if (cmd[0] == WRITE_6) {
564 atomic_set(&STp->stats->last_write_size, bufflen);
565 STp->stats->write_time = ktime_get();
566 } else if (cmd[0] == READ_6) {
567 atomic_set(&STp->stats->last_read_size, bufflen);
568 STp->stats->read_time = ktime_get();
569 } else {
570 STp->stats->other_time = ktime_get();
571 }
572
573 SRpnt->bio = req->bio;
574 req->cmd_len = COMMAND_SIZE(cmd[0]);
575 memset(req->cmd, 0, BLK_MAX_CDB);
576 memcpy(req->cmd, cmd, req->cmd_len);
577 req->sense = SRpnt->sense;
578 req->sense_len = 0;
579 req->timeout = timeout;
580 req->retries = retries;
581 req->end_io_data = SRpnt;
582
583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
584 return 0;
585}
586
587/* Do the scsi command. Waits until command performed if do_wait is true.
588 Otherwise write_behind_check() is used to check that the command
589 has finished. */
590static struct st_request *
591st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
592 int bytes, int direction, int timeout, int retries, int do_wait)
593{
594 struct completion *waiting;
595 struct rq_map_data *mdata = &STp->buffer->map_data;
596 int ret;
597
598 /* if async, make sure there's no command outstanding */
599 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
600 st_printk(KERN_ERR, STp,
601 "Async command already active.\n");
602 if (signal_pending(current))
603 (STp->buffer)->syscall_result = (-EINTR);
604 else
605 (STp->buffer)->syscall_result = (-EBUSY);
606 return NULL;
607 }
608
609 if (!SRpnt) {
610 SRpnt = st_allocate_request(STp);
611 if (!SRpnt)
612 return NULL;
613 }
614
615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
616 which IO is outstanding. It's nulled out when the IO completes. */
617 if (!do_wait)
618 (STp->buffer)->last_SRpnt = SRpnt;
619
620 waiting = &STp->wait;
621 init_completion(waiting);
622 SRpnt->waiting = waiting;
623
624 if (STp->buffer->do_dio) {
625 mdata->page_order = 0;
626 mdata->nr_entries = STp->buffer->sg_segs;
627 mdata->pages = STp->buffer->mapped_pages;
628 } else {
629 mdata->page_order = STp->buffer->reserved_page_order;
630 mdata->nr_entries =
631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
632 mdata->pages = STp->buffer->reserved_pages;
633 mdata->offset = 0;
634 }
635
636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
637 STp->buffer->cmdstat.have_sense = 0;
638 STp->buffer->syscall_result = 0;
639
640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
641 retries);
642 if (ret) {
643 /* could not allocate the buffer or request was too large */
644 (STp->buffer)->syscall_result = (-EBUSY);
645 (STp->buffer)->last_SRpnt = NULL;
646 } else if (do_wait) {
647 wait_for_completion(waiting);
648 SRpnt->waiting = NULL;
649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
650 }
651
652 return SRpnt;
653}
654
655
656/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
657 write has been correct but EOM early warning reached, -EIO if write ended in
658 error or zero if write successful. Asynchronous writes are used only in
659 variable block mode. */
660static int write_behind_check(struct scsi_tape * STp)
661{
662 int retval = 0;
663 struct st_buffer *STbuffer;
664 struct st_partstat *STps;
665 struct st_cmdstatus *cmdstatp;
666 struct st_request *SRpnt;
667
668 STbuffer = STp->buffer;
669 if (!STbuffer->writing)
670 return 0;
671
672 DEB(
673 if (STp->write_pending)
674 STp->nbr_waits++;
675 else
676 STp->nbr_finished++;
677 ) /* end DEB */
678
679 wait_for_completion(&(STp->wait));
680 SRpnt = STbuffer->last_SRpnt;
681 STbuffer->last_SRpnt = NULL;
682 SRpnt->waiting = NULL;
683
684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
685 st_release_request(SRpnt);
686
687 STbuffer->buffer_bytes -= STbuffer->writing;
688 STps = &(STp->ps[STp->partition]);
689 if (STps->drv_block >= 0) {
690 if (STp->block_size == 0)
691 STps->drv_block++;
692 else
693 STps->drv_block += STbuffer->writing / STp->block_size;
694 }
695
696 cmdstatp = &STbuffer->cmdstat;
697 if (STbuffer->syscall_result) {
698 retval = -EIO;
699 if (cmdstatp->have_sense && !cmdstatp->deferred &&
700 (cmdstatp->flags & SENSE_EOM) &&
701 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
703 /* EOM at write-behind, has all data been written? */
704 if (!cmdstatp->remainder_valid ||
705 cmdstatp->uremainder64 == 0)
706 retval = -ENOSPC;
707 }
708 if (retval == -EIO)
709 STps->drv_block = -1;
710 }
711 STbuffer->writing = 0;
712
713 DEB(if (debugging && retval)
714 st_printk(ST_DEB_MSG, STp,
715 "Async write error %x, return value %d.\n",
716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
717
718 return retval;
719}
720
721
722/* Step over EOF if it has been inadvertently crossed (ioctl not used because
723 it messes up the block number). */
724static int cross_eof(struct scsi_tape * STp, int forward)
725{
726 struct st_request *SRpnt;
727 unsigned char cmd[MAX_COMMAND_SIZE];
728
729 cmd[0] = SPACE;
730 cmd[1] = 0x01; /* Space FileMarks */
731 if (forward) {
732 cmd[2] = cmd[3] = 0;
733 cmd[4] = 1;
734 } else
735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
736 cmd[5] = 0;
737
738 DEBC_printk(STp, "Stepping over filemark %s.\n",
739 forward ? "forward" : "backward");
740
741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
742 STp->device->request_queue->rq_timeout,
743 MAX_RETRIES, 1);
744 if (!SRpnt)
745 return (STp->buffer)->syscall_result;
746
747 st_release_request(SRpnt);
748 SRpnt = NULL;
749
750 if ((STp->buffer)->cmdstat.midlevel_result != 0)
751 st_printk(KERN_ERR, STp,
752 "Stepping over filemark %s failed.\n",
753 forward ? "forward" : "backward");
754
755 return (STp->buffer)->syscall_result;
756}
757
758
759/* Flush the write buffer (never need to write if variable blocksize). */
760static int st_flush_write_buffer(struct scsi_tape * STp)
761{
762 int transfer, blks;
763 int result;
764 unsigned char cmd[MAX_COMMAND_SIZE];
765 struct st_request *SRpnt;
766 struct st_partstat *STps;
767
768 result = write_behind_check(STp);
769 if (result)
770 return result;
771
772 result = 0;
773 if (STp->dirty == 1) {
774
775 transfer = STp->buffer->buffer_bytes;
776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
777
778 memset(cmd, 0, MAX_COMMAND_SIZE);
779 cmd[0] = WRITE_6;
780 cmd[1] = 1;
781 blks = transfer / STp->block_size;
782 cmd[2] = blks >> 16;
783 cmd[3] = blks >> 8;
784 cmd[4] = blks;
785
786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
787 STp->device->request_queue->rq_timeout,
788 MAX_WRITE_RETRIES, 1);
789 if (!SRpnt)
790 return (STp->buffer)->syscall_result;
791
792 STps = &(STp->ps[STp->partition]);
793 if ((STp->buffer)->syscall_result != 0) {
794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
795
796 if (cmdstatp->have_sense && !cmdstatp->deferred &&
797 (cmdstatp->flags & SENSE_EOM) &&
798 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
800 (!cmdstatp->remainder_valid ||
801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
802 STp->dirty = 0;
803 (STp->buffer)->buffer_bytes = 0;
804 if (STps->drv_block >= 0)
805 STps->drv_block += blks;
806 result = (-ENOSPC);
807 } else {
808 st_printk(KERN_ERR, STp, "Error on flush.\n");
809 STps->drv_block = (-1);
810 result = (-EIO);
811 }
812 } else {
813 if (STps->drv_block >= 0)
814 STps->drv_block += blks;
815 STp->dirty = 0;
816 (STp->buffer)->buffer_bytes = 0;
817 }
818 st_release_request(SRpnt);
819 SRpnt = NULL;
820 }
821 return result;
822}
823
824
825/* Flush the tape buffer. The tape will be positioned correctly unless
826 seek_next is true. */
827static int flush_buffer(struct scsi_tape *STp, int seek_next)
828{
829 int backspace, result;
830 struct st_buffer *STbuffer;
831 struct st_partstat *STps;
832
833 STbuffer = STp->buffer;
834
835 /*
836 * If there was a bus reset, block further access
837 * to this device.
838 */
839 if (STp->pos_unknown)
840 return (-EIO);
841
842 if (STp->ready != ST_READY)
843 return 0;
844 STps = &(STp->ps[STp->partition]);
845 if (STps->rw == ST_WRITING) /* Writing */
846 return st_flush_write_buffer(STp);
847
848 if (STp->block_size == 0)
849 return 0;
850
851 backspace = ((STp->buffer)->buffer_bytes +
852 (STp->buffer)->read_pointer) / STp->block_size -
853 ((STp->buffer)->read_pointer + STp->block_size - 1) /
854 STp->block_size;
855 (STp->buffer)->buffer_bytes = 0;
856 (STp->buffer)->read_pointer = 0;
857 result = 0;
858 if (!seek_next) {
859 if (STps->eof == ST_FM_HIT) {
860 result = cross_eof(STp, 0); /* Back over the EOF hit */
861 if (!result)
862 STps->eof = ST_NOEOF;
863 else {
864 if (STps->drv_file >= 0)
865 STps->drv_file++;
866 STps->drv_block = 0;
867 }
868 }
869 if (!result && backspace > 0)
870 result = st_int_ioctl(STp, MTBSR, backspace);
871 } else if (STps->eof == ST_FM_HIT) {
872 if (STps->drv_file >= 0)
873 STps->drv_file++;
874 STps->drv_block = 0;
875 STps->eof = ST_NOEOF;
876 }
877 return result;
878
879}
880
881/* Set the mode parameters */
882static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
883{
884 int set_it = 0;
885 unsigned long arg;
886
887 if (!STp->density_changed &&
888 STm->default_density >= 0 &&
889 STm->default_density != STp->density) {
890 arg = STm->default_density;
891 set_it = 1;
892 } else
893 arg = STp->density;
894 arg <<= MT_ST_DENSITY_SHIFT;
895 if (!STp->blksize_changed &&
896 STm->default_blksize >= 0 &&
897 STm->default_blksize != STp->block_size) {
898 arg |= STm->default_blksize;
899 set_it = 1;
900 } else
901 arg |= STp->block_size;
902 if (set_it &&
903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
904 st_printk(KERN_WARNING, STp,
905 "Can't set default block size to %d bytes "
906 "and density %x.\n",
907 STm->default_blksize, STm->default_density);
908 if (modes_defined)
909 return (-EINVAL);
910 }
911 return 0;
912}
913
914
915/* Lock or unlock the drive door. Don't use when st_request allocated. */
916static int do_door_lock(struct scsi_tape * STp, int do_lock)
917{
918 int retval;
919
920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
921
922 retval = scsi_set_medium_removal(STp->device,
923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
924 if (!retval)
925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
926 else
927 STp->door_locked = ST_LOCK_FAILS;
928 return retval;
929}
930
931
932/* Set the internal state after reset */
933static void reset_state(struct scsi_tape *STp)
934{
935 int i;
936 struct st_partstat *STps;
937
938 STp->pos_unknown = 0;
939 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
940 STps = &(STp->ps[i]);
941 STps->rw = ST_IDLE;
942 STps->eof = ST_NOEOF;
943 STps->at_sm = 0;
944 STps->last_block_valid = 0;
945 STps->drv_block = -1;
946 STps->drv_file = -1;
947 }
948 if (STp->can_partitions) {
949 STp->partition = find_partition(STp);
950 if (STp->partition < 0)
951 STp->partition = 0;
952 STp->new_partition = STp->partition;
953 }
954}
955
956/* Test if the drive is ready. Returns either one of the codes below or a negative system
957 error code. */
958#define CHKRES_READY 0
959#define CHKRES_NEW_SESSION 1
960#define CHKRES_NOT_READY 2
961#define CHKRES_NO_TAPE 3
962
963#define MAX_ATTENTIONS 10
964
965static int test_ready(struct scsi_tape *STp, int do_wait)
966{
967 int attentions, waits, max_wait, scode;
968 int retval = CHKRES_READY, new_session = 0;
969 unsigned char cmd[MAX_COMMAND_SIZE];
970 struct st_request *SRpnt = NULL;
971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
972
973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
974
975 for (attentions=waits=0; ; ) {
976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
977 cmd[0] = TEST_UNIT_READY;
978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
979 STp->long_timeout, MAX_READY_RETRIES, 1);
980
981 if (!SRpnt) {
982 retval = (STp->buffer)->syscall_result;
983 break;
984 }
985
986 if (cmdstatp->have_sense) {
987
988 scode = cmdstatp->sense_hdr.sense_key;
989
990 if (scode == UNIT_ATTENTION) { /* New media? */
991 new_session = 1;
992 if (attentions < MAX_ATTENTIONS) {
993 attentions++;
994 continue;
995 }
996 else {
997 retval = (-EIO);
998 break;
999 }
1000 }
1001
1002 if (scode == NOT_READY) {
1003 if (waits < max_wait) {
1004 if (msleep_interruptible(1000)) {
1005 retval = (-EINTR);
1006 break;
1007 }
1008 waits++;
1009 continue;
1010 }
1011 else {
1012 if ((STp->device)->scsi_level >= SCSI_2 &&
1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1014 retval = CHKRES_NO_TAPE;
1015 else
1016 retval = CHKRES_NOT_READY;
1017 break;
1018 }
1019 }
1020 }
1021
1022 retval = (STp->buffer)->syscall_result;
1023 if (!retval)
1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1025 break;
1026 }
1027
1028 if (SRpnt != NULL)
1029 st_release_request(SRpnt);
1030 return retval;
1031}
1032
1033
1034/* See if the drive is ready and gather information about the tape. Return values:
1035 < 0 negative error code from errno.h
1036 0 drive ready
1037 1 drive not ready (possibly no tape)
1038*/
1039static int check_tape(struct scsi_tape *STp, struct file *filp)
1040{
1041 int i, retval, new_session = 0, do_wait;
1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1043 unsigned short st_flags = filp->f_flags;
1044 struct st_request *SRpnt = NULL;
1045 struct st_modedef *STm;
1046 struct st_partstat *STps;
1047 struct inode *inode = file_inode(filp);
1048 int mode = TAPE_MODE(inode);
1049
1050 STp->ready = ST_READY;
1051
1052 if (mode != STp->current_mode) {
1053 DEBC_printk(STp, "Mode change from %d to %d.\n",
1054 STp->current_mode, mode);
1055 new_session = 1;
1056 STp->current_mode = mode;
1057 }
1058 STm = &(STp->modes[STp->current_mode]);
1059
1060 saved_cleaning = STp->cleaning_req;
1061 STp->cleaning_req = 0;
1062
1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1064 retval = test_ready(STp, do_wait);
1065
1066 if (retval < 0)
1067 goto err_out;
1068
1069 if (retval == CHKRES_NEW_SESSION) {
1070 STp->pos_unknown = 0;
1071 STp->partition = STp->new_partition = 0;
1072 if (STp->can_partitions)
1073 STp->nbr_partitions = 1; /* This guess will be updated later
1074 if necessary */
1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1076 STps = &(STp->ps[i]);
1077 STps->rw = ST_IDLE;
1078 STps->eof = ST_NOEOF;
1079 STps->at_sm = 0;
1080 STps->last_block_valid = 0;
1081 STps->drv_block = 0;
1082 STps->drv_file = 0;
1083 }
1084 new_session = 1;
1085 }
1086 else {
1087 STp->cleaning_req |= saved_cleaning;
1088
1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1090 if (retval == CHKRES_NO_TAPE)
1091 STp->ready = ST_NO_TAPE;
1092 else
1093 STp->ready = ST_NOT_READY;
1094
1095 STp->density = 0; /* Clear the erroneous "residue" */
1096 STp->write_prot = 0;
1097 STp->block_size = 0;
1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1099 STp->partition = STp->new_partition = 0;
1100 STp->door_locked = ST_UNLOCKED;
1101 return CHKRES_NOT_READY;
1102 }
1103 }
1104
1105 if (STp->omit_blklims)
1106 STp->min_block = STp->max_block = (-1);
1107 else {
1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1109 cmd[0] = READ_BLOCK_LIMITS;
1110
1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1112 STp->device->request_queue->rq_timeout,
1113 MAX_READY_RETRIES, 1);
1114 if (!SRpnt) {
1115 retval = (STp->buffer)->syscall_result;
1116 goto err_out;
1117 }
1118
1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1123 (STp->buffer)->b_data[5];
1124 if ( DEB( debugging || ) !STp->inited)
1125 st_printk(KERN_INFO, STp,
1126 "Block limits %d - %d bytes.\n",
1127 STp->min_block, STp->max_block);
1128 } else {
1129 STp->min_block = STp->max_block = (-1);
1130 DEBC_printk(STp, "Can't read block limits.\n");
1131 }
1132 }
1133
1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1135 cmd[0] = MODE_SENSE;
1136 cmd[4] = 12;
1137
1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1139 STp->device->request_queue->rq_timeout,
1140 MAX_READY_RETRIES, 1);
1141 if (!SRpnt) {
1142 retval = (STp->buffer)->syscall_result;
1143 goto err_out;
1144 }
1145
1146 if ((STp->buffer)->syscall_result != 0) {
1147 DEBC_printk(STp, "No Mode Sense.\n");
1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1150 STp->drv_write_prot = 0;
1151 } else {
1152 DEBC_printk(STp,"Mode sense. Length %d, "
1153 "medium %x, WBS %x, BLL %d\n",
1154 (STp->buffer)->b_data[0],
1155 (STp->buffer)->b_data[1],
1156 (STp->buffer)->b_data[2],
1157 (STp->buffer)->b_data[3]);
1158
1159 if ((STp->buffer)->b_data[3] >= 8) {
1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1161 STp->density = (STp->buffer)->b_data[4];
1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1164 DEBC_printk(STp, "Density %x, tape length: %x, "
1165 "drv buffer: %d\n",
1166 STp->density,
1167 (STp->buffer)->b_data[5] * 65536 +
1168 (STp->buffer)->b_data[6] * 256 +
1169 (STp->buffer)->b_data[7],
1170 STp->drv_buffer);
1171 }
1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1173 if (!STp->drv_buffer && STp->immediate_filemark) {
1174 st_printk(KERN_WARNING, STp,
1175 "non-buffered tape: disabling "
1176 "writing immediate filemarks\n");
1177 STp->immediate_filemark = 0;
1178 }
1179 }
1180 st_release_request(SRpnt);
1181 SRpnt = NULL;
1182 STp->inited = 1;
1183
1184 if (STp->block_size > 0)
1185 (STp->buffer)->buffer_blocks =
1186 (STp->buffer)->buffer_size / STp->block_size;
1187 else
1188 (STp->buffer)->buffer_blocks = 1;
1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1190
1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1192 STp->block_size, (STp->buffer)->buffer_size,
1193 (STp->buffer)->buffer_blocks);
1194
1195 if (STp->drv_write_prot) {
1196 STp->write_prot = 1;
1197
1198 DEBC_printk(STp, "Write protected\n");
1199
1200 if (do_wait &&
1201 ((st_flags & O_ACCMODE) == O_WRONLY ||
1202 (st_flags & O_ACCMODE) == O_RDWR)) {
1203 retval = (-EROFS);
1204 goto err_out;
1205 }
1206 }
1207
1208 if (STp->can_partitions && STp->nbr_partitions < 1) {
1209 /* This code is reached when the device is opened for the first time
1210 after the driver has been initialized with tape in the drive and the
1211 partition support has been enabled. */
1212 DEBC_printk(STp, "Updating partition number in status.\n");
1213 if ((STp->partition = find_partition(STp)) < 0) {
1214 retval = STp->partition;
1215 goto err_out;
1216 }
1217 STp->new_partition = STp->partition;
1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1219 }
1220
1221 if (new_session) { /* Change the drive parameters for the new mode */
1222 STp->density_changed = STp->blksize_changed = 0;
1223 STp->compression_changed = 0;
1224 if (!(STm->defaults_for_writes) &&
1225 (retval = set_mode_densblk(STp, STm)) < 0)
1226 goto err_out;
1227
1228 if (STp->default_drvbuffer != 0xff) {
1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1230 st_printk(KERN_WARNING, STp,
1231 "Can't set default drive "
1232 "buffering to %d.\n",
1233 STp->default_drvbuffer);
1234 }
1235 }
1236
1237 return CHKRES_READY;
1238
1239 err_out:
1240 return retval;
1241}
1242
1243
1244 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1245 module count. */
1246static int st_open(struct inode *inode, struct file *filp)
1247{
1248 int i, retval = (-EIO);
1249 int resumed = 0;
1250 struct scsi_tape *STp;
1251 struct st_partstat *STps;
1252 int dev = TAPE_NR(inode);
1253
1254 /*
1255 * We really want to do nonseekable_open(inode, filp); here, but some
1256 * versions of tar incorrectly call lseek on tapes and bail out if that
1257 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1258 */
1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1260
1261 if (!(STp = scsi_tape_get(dev))) {
1262 return -ENXIO;
1263 }
1264
1265 filp->private_data = STp;
1266
1267 spin_lock(&st_use_lock);
1268 if (STp->in_use) {
1269 spin_unlock(&st_use_lock);
1270 scsi_tape_put(STp);
1271 DEBC_printk(STp, "Device already in use.\n");
1272 return (-EBUSY);
1273 }
1274
1275 STp->in_use = 1;
1276 spin_unlock(&st_use_lock);
1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1278
1279 if (scsi_autopm_get_device(STp->device) < 0) {
1280 retval = -EIO;
1281 goto err_out;
1282 }
1283 resumed = 1;
1284 if (!scsi_block_when_processing_errors(STp->device)) {
1285 retval = (-ENXIO);
1286 goto err_out;
1287 }
1288
1289 /* See that we have at least a one page buffer available */
1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1291 st_printk(KERN_WARNING, STp,
1292 "Can't allocate one page tape buffer.\n");
1293 retval = (-EOVERFLOW);
1294 goto err_out;
1295 }
1296
1297 (STp->buffer)->cleared = 0;
1298 (STp->buffer)->writing = 0;
1299 (STp->buffer)->syscall_result = 0;
1300
1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1302
1303 STp->dirty = 0;
1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1305 STps = &(STp->ps[i]);
1306 STps->rw = ST_IDLE;
1307 }
1308 STp->try_dio_now = STp->try_dio;
1309 STp->recover_count = 0;
1310 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1312
1313 retval = check_tape(STp, filp);
1314 if (retval < 0)
1315 goto err_out;
1316 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1317 retval != CHKRES_READY) {
1318 if (STp->ready == NO_TAPE)
1319 retval = (-ENOMEDIUM);
1320 else
1321 retval = (-EIO);
1322 goto err_out;
1323 }
1324 return 0;
1325
1326 err_out:
1327 normalize_buffer(STp->buffer);
1328 spin_lock(&st_use_lock);
1329 STp->in_use = 0;
1330 spin_unlock(&st_use_lock);
1331 if (resumed)
1332 scsi_autopm_put_device(STp->device);
1333 scsi_tape_put(STp);
1334 return retval;
1335
1336}
1337
1338
1339/* Flush the tape buffer before close */
1340static int st_flush(struct file *filp, fl_owner_t id)
1341{
1342 int result = 0, result2;
1343 unsigned char cmd[MAX_COMMAND_SIZE];
1344 struct st_request *SRpnt;
1345 struct scsi_tape *STp = filp->private_data;
1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1347 struct st_partstat *STps = &(STp->ps[STp->partition]);
1348
1349 if (file_count(filp) > 1)
1350 return 0;
1351
1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1353 result = st_flush_write_buffer(STp);
1354 if (result != 0 && result != (-ENOSPC))
1355 goto out;
1356 }
1357
1358 if (STp->can_partitions &&
1359 (result2 = switch_partition(STp)) < 0) {
1360 DEBC_printk(STp, "switch_partition at close failed.\n");
1361 if (result == 0)
1362 result = result2;
1363 goto out;
1364 }
1365
1366 DEBC( if (STp->nbr_requests)
1367 st_printk(KERN_DEBUG, STp,
1368 "Number of r/w requests %d, dio used in %d, "
1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1370 STp->nbr_pages));
1371
1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1374
1375#if DEBUG
1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1377 STp->nbr_waits, STp->nbr_finished);
1378#endif
1379 memset(cmd, 0, MAX_COMMAND_SIZE);
1380 cmd[0] = WRITE_FILEMARKS;
1381 if (STp->immediate_filemark)
1382 cmd[1] = 1;
1383 cmd[4] = 1 + STp->two_fm;
1384
1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1386 STp->device->request_queue->rq_timeout,
1387 MAX_WRITE_RETRIES, 1);
1388 if (!SRpnt) {
1389 result = (STp->buffer)->syscall_result;
1390 goto out;
1391 }
1392
1393 if (STp->buffer->syscall_result == 0 ||
1394 (cmdstatp->have_sense && !cmdstatp->deferred &&
1395 (cmdstatp->flags & SENSE_EOM) &&
1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1399 /* Write successful at EOM */
1400 st_release_request(SRpnt);
1401 SRpnt = NULL;
1402 if (STps->drv_file >= 0)
1403 STps->drv_file++;
1404 STps->drv_block = 0;
1405 if (STp->two_fm)
1406 cross_eof(STp, 0);
1407 STps->eof = ST_FM;
1408 }
1409 else { /* Write error */
1410 st_release_request(SRpnt);
1411 SRpnt = NULL;
1412 st_printk(KERN_ERR, STp,
1413 "Error on write filemark.\n");
1414 if (result == 0)
1415 result = (-EIO);
1416 }
1417
1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1419 } else if (!STp->rew_at_close) {
1420 STps = &(STp->ps[STp->partition]);
1421 if (!STm->sysv || STps->rw != ST_READING) {
1422 if (STp->can_bsr)
1423 result = flush_buffer(STp, 0);
1424 else if (STps->eof == ST_FM_HIT) {
1425 result = cross_eof(STp, 0);
1426 if (result) {
1427 if (STps->drv_file >= 0)
1428 STps->drv_file++;
1429 STps->drv_block = 0;
1430 STps->eof = ST_FM;
1431 } else
1432 STps->eof = ST_NOEOF;
1433 }
1434 } else if ((STps->eof == ST_NOEOF &&
1435 !(result = cross_eof(STp, 1))) ||
1436 STps->eof == ST_FM_HIT) {
1437 if (STps->drv_file >= 0)
1438 STps->drv_file++;
1439 STps->drv_block = 0;
1440 STps->eof = ST_FM;
1441 }
1442 }
1443
1444 out:
1445 if (STp->rew_at_close) {
1446 result2 = st_int_ioctl(STp, MTREW, 1);
1447 if (result == 0)
1448 result = result2;
1449 }
1450 return result;
1451}
1452
1453
1454/* Close the device and release it. BKL is not needed: this is the only thread
1455 accessing this tape. */
1456static int st_release(struct inode *inode, struct file *filp)
1457{
1458 int result = 0;
1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
1465 spin_lock(&st_use_lock);
1466 STp->in_use = 0;
1467 spin_unlock(&st_use_lock);
1468 scsi_autopm_put_device(STp->device);
1469 scsi_tape_put(STp);
1470
1471 return result;
1472}
1473
1474/* The checks common to both reading and writing */
1475static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476{
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
1516 DEB(
1517 if (!STp->in_use) {
1518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
1520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545{
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
1550 i = STp->try_dio_now && try_rdio;
1551 else
1552 i = STp->try_dio_now && try_wdio;
1553
1554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
1558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
1565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
1569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
1579 else {
1580 bufsize = count;
1581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
1587 if (bufsize > STbp->buffer_size &&
1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
1592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601}
1602
1603
1604/* Can be called more than once after each setup_buffer() */
1605static void release_buffering(struct scsi_tape *STp, int is_read)
1606{
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1612 STbp->do_dio = 0;
1613 STbp->sg_segs = 0;
1614 }
1615}
1616
1617
1618/* Write command */
1619static ssize_t
1620st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621{
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
1629 struct st_request *SRpnt = NULL;
1630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
1634
1635 if (mutex_lock_interruptible(&STp->lock))
1636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
1646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
1673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
1777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
1781 if (async_write && !STbp->syscall_result) {
1782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
1793 DEBC_printk(STp, "Error on write:\n");
1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
1808 b_point -= undone;
1809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
1820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
1823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
1835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
1839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
1849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
1851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
1856 retval = STbp->syscall_result;
1857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
1886 st_release_request(SRpnt);
1887 release_buffering(STp, 0);
1888 mutex_unlock(&STp->lock);
1889
1890 return retval;
1891}
1892
1893/* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898*/
1899static long read_tape(struct scsi_tape *STp, long count,
1900 struct st_request ** aSRpnt)
1901{
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
1904 struct st_request *SRpnt;
1905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
1909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
1937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
1939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
1947 release_buffering(STp, 1);
1948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
1960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
1966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
1977 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1978 if (STp->block_size == 0)
1979 transfer = bytes;
1980 /* Some drives set ILI with MEDIUM ERROR */
1981 cmdstatp->flags &= ~SENSE_ILI;
1982 }
1983
1984 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1985 if (STp->block_size == 0 &&
1986 transfer < 0) {
1987 st_printk(KERN_NOTICE, STp,
1988 "Failed to read %d "
1989 "byte block with %d "
1990 "byte transfer.\n",
1991 bytes - transfer,
1992 bytes);
1993 if (STps->drv_block >= 0)
1994 STps->drv_block += 1;
1995 STbp->buffer_bytes = 0;
1996 return (-ENOMEM);
1997 } else if (STp->block_size == 0) {
1998 STbp->buffer_bytes = bytes - transfer;
1999 } else {
2000 st_release_request(SRpnt);
2001 SRpnt = *aSRpnt = NULL;
2002 if (transfer == blks) { /* We did not get anything, error */
2003 st_printk(KERN_NOTICE, STp,
2004 "Incorrect "
2005 "block size.\n");
2006 if (STps->drv_block >= 0)
2007 STps->drv_block += blks - transfer + 1;
2008 st_int_ioctl(STp, MTBSR, 1);
2009 return (-EIO);
2010 }
2011 /* We have some data, deliver it */
2012 STbp->buffer_bytes = (blks - transfer) *
2013 STp->block_size;
2014 DEBC_printk(STp, "ILI but "
2015 "enough data "
2016 "received %ld "
2017 "%d.\n", count,
2018 STbp->buffer_bytes);
2019 if (STps->drv_block >= 0)
2020 STps->drv_block += 1;
2021 if (st_int_ioctl(STp, MTBSR, 1))
2022 return (-EIO);
2023 }
2024 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2025 if (STps->eof != ST_FM_HIT)
2026 STps->eof = ST_FM_HIT;
2027 else
2028 STps->eof = ST_EOD_2;
2029 if (STp->block_size == 0)
2030 STbp->buffer_bytes = 0;
2031 else
2032 STbp->buffer_bytes =
2033 bytes - transfer * STp->block_size;
2034 DEBC_printk(STp, "EOF detected (%d "
2035 "bytes read).\n",
2036 STbp->buffer_bytes);
2037 } else if (cmdstatp->flags & SENSE_EOM) {
2038 if (STps->eof == ST_FM)
2039 STps->eof = ST_EOD_1;
2040 else
2041 STps->eof = ST_EOM_OK;
2042 if (STp->block_size == 0)
2043 STbp->buffer_bytes = bytes - transfer;
2044 else
2045 STbp->buffer_bytes =
2046 bytes - transfer * STp->block_size;
2047
2048 DEBC_printk(STp, "EOM detected (%d "
2049 "bytes read).\n",
2050 STbp->buffer_bytes);
2051 }
2052 }
2053 /* end of EOF, EOM, ILI test */
2054 else { /* nonzero sense key */
2055 DEBC_printk(STp, "Tape error while reading.\n");
2056 STps->drv_block = (-1);
2057 if (STps->eof == ST_FM &&
2058 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2059 DEBC_printk(STp, "Zero returned for "
2060 "first BLANK CHECK "
2061 "after EOF.\n");
2062 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2063 } else /* Some other extended sense code */
2064 retval = (-EIO);
2065 }
2066
2067 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2068 STbp->buffer_bytes = 0;
2069 }
2070 /* End of extended sense test */
2071 else { /* Non-extended sense */
2072 retval = STbp->syscall_result;
2073 }
2074
2075 }
2076 /* End of error handling */
2077 else { /* Read successful */
2078 STbp->buffer_bytes = bytes;
2079 if (STp->sili) /* In fixed block mode residual is always zero here */
2080 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2081 }
2082
2083 if (STps->drv_block >= 0) {
2084 if (STp->block_size == 0)
2085 STps->drv_block++;
2086 else
2087 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2088 }
2089 return retval;
2090}
2091
2092
2093/* Read command */
2094static ssize_t
2095st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2096{
2097 ssize_t total;
2098 ssize_t retval = 0;
2099 ssize_t i, transfer;
2100 int special, do_dio = 0;
2101 struct st_request *SRpnt = NULL;
2102 struct scsi_tape *STp = filp->private_data;
2103 struct st_modedef *STm;
2104 struct st_partstat *STps;
2105 struct st_buffer *STbp = STp->buffer;
2106
2107 if (mutex_lock_interruptible(&STp->lock))
2108 return -ERESTARTSYS;
2109
2110 retval = rw_checks(STp, filp, count);
2111 if (retval || count == 0)
2112 goto out;
2113
2114 STm = &(STp->modes[STp->current_mode]);
2115 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2116 if (!STm->do_read_ahead) {
2117 retval = (-EINVAL); /* Read must be integral number of blocks */
2118 goto out;
2119 }
2120 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2121 }
2122
2123 STps = &(STp->ps[STp->partition]);
2124 if (STps->rw == ST_WRITING) {
2125 retval = flush_buffer(STp, 0);
2126 if (retval)
2127 goto out;
2128 STps->rw = ST_READING;
2129 }
2130 DEB(
2131 if (debugging && STps->eof != ST_NOEOF)
2132 st_printk(ST_DEB_MSG, STp,
2133 "EOF/EOM flag up (%d). Bytes %d\n",
2134 STps->eof, STbp->buffer_bytes);
2135 ) /* end DEB */
2136
2137 retval = setup_buffering(STp, buf, count, 1);
2138 if (retval)
2139 goto out;
2140 do_dio = STbp->do_dio;
2141
2142 if (STbp->buffer_bytes == 0 &&
2143 STps->eof >= ST_EOD_1) {
2144 if (STps->eof < ST_EOD) {
2145 STps->eof += 1;
2146 retval = 0;
2147 goto out;
2148 }
2149 retval = (-EIO); /* EOM or Blank Check */
2150 goto out;
2151 }
2152
2153 if (do_dio) {
2154 /* Check the buffer writability before any tape movement. Don't alter
2155 buffer data. */
2156 if (copy_from_user(&i, buf, 1) != 0 ||
2157 copy_to_user(buf, &i, 1) != 0 ||
2158 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2159 copy_to_user(buf + count - 1, &i, 1) != 0) {
2160 retval = (-EFAULT);
2161 goto out;
2162 }
2163 }
2164
2165 STps->rw = ST_READING;
2166
2167
2168 /* Loop until enough data in buffer or a special condition found */
2169 for (total = 0, special = 0; total < count && !special;) {
2170
2171 /* Get new data if the buffer is empty */
2172 if (STbp->buffer_bytes == 0) {
2173 special = read_tape(STp, count - total, &SRpnt);
2174 if (special < 0) { /* No need to continue read */
2175 retval = special;
2176 goto out;
2177 }
2178 }
2179
2180 /* Move the data from driver buffer to user buffer */
2181 if (STbp->buffer_bytes > 0) {
2182 DEB(
2183 if (debugging && STps->eof != ST_NOEOF)
2184 st_printk(ST_DEB_MSG, STp,
2185 "EOF up (%d). Left %d, needed %d.\n",
2186 STps->eof, STbp->buffer_bytes,
2187 (int)(count - total));
2188 ) /* end DEB */
2189 transfer = STbp->buffer_bytes < count - total ?
2190 STbp->buffer_bytes : count - total;
2191 if (!do_dio) {
2192 i = from_buffer(STbp, buf, transfer);
2193 if (i) {
2194 retval = i;
2195 goto out;
2196 }
2197 }
2198 buf += transfer;
2199 total += transfer;
2200 }
2201
2202 if (STp->block_size == 0)
2203 break; /* Read only one variable length block */
2204
2205 } /* for (total = 0, special = 0;
2206 total < count && !special; ) */
2207
2208 /* Change the eof state if no data from tape or buffer */
2209 if (total == 0) {
2210 if (STps->eof == ST_FM_HIT) {
2211 STps->eof = ST_FM;
2212 STps->drv_block = 0;
2213 if (STps->drv_file >= 0)
2214 STps->drv_file++;
2215 } else if (STps->eof == ST_EOD_1) {
2216 STps->eof = ST_EOD_2;
2217 STps->drv_block = 0;
2218 if (STps->drv_file >= 0)
2219 STps->drv_file++;
2220 } else if (STps->eof == ST_EOD_2)
2221 STps->eof = ST_EOD;
2222 } else if (STps->eof == ST_FM)
2223 STps->eof = ST_NOEOF;
2224 retval = total;
2225
2226 out:
2227 if (SRpnt != NULL) {
2228 st_release_request(SRpnt);
2229 SRpnt = NULL;
2230 }
2231 if (do_dio) {
2232 release_buffering(STp, 1);
2233 STbp->buffer_bytes = 0;
2234 }
2235 mutex_unlock(&STp->lock);
2236
2237 return retval;
2238}
2239
2240
2241
2242DEB(
2243/* Set the driver options */
2244static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2245{
2246 if (debugging) {
2247 st_printk(KERN_INFO, STp,
2248 "Mode %d options: buffer writes: %d, "
2249 "async writes: %d, read ahead: %d\n",
2250 STp->current_mode, STm->do_buffer_writes,
2251 STm->do_async_writes, STm->do_read_ahead);
2252 st_printk(KERN_INFO, STp,
2253 " can bsr: %d, two FMs: %d, "
2254 "fast mteom: %d, auto lock: %d,\n",
2255 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2256 STp->do_auto_lock);
2257 st_printk(KERN_INFO, STp,
2258 " defs for wr: %d, no block limits: %d, "
2259 "partitions: %d, s2 log: %d\n",
2260 STm->defaults_for_writes, STp->omit_blklims,
2261 STp->can_partitions, STp->scsi2_logical);
2262 st_printk(KERN_INFO, STp,
2263 " sysv: %d nowait: %d sili: %d "
2264 "nowait_filemark: %d\n",
2265 STm->sysv, STp->immediate, STp->sili,
2266 STp->immediate_filemark);
2267 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2268 }
2269}
2270 )
2271
2272
2273static int st_set_options(struct scsi_tape *STp, long options)
2274{
2275 int value;
2276 long code;
2277 struct st_modedef *STm;
2278 struct cdev *cd0, *cd1;
2279 struct device *d0, *d1;
2280
2281 STm = &(STp->modes[STp->current_mode]);
2282 if (!STm->defined) {
2283 cd0 = STm->cdevs[0];
2284 cd1 = STm->cdevs[1];
2285 d0 = STm->devs[0];
2286 d1 = STm->devs[1];
2287 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2288 STm->cdevs[0] = cd0;
2289 STm->cdevs[1] = cd1;
2290 STm->devs[0] = d0;
2291 STm->devs[1] = d1;
2292 modes_defined = 1;
2293 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2294 STp->current_mode);
2295 }
2296
2297 code = options & MT_ST_OPTIONS;
2298 if (code == MT_ST_BOOLEANS) {
2299 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2300 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2301 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2302 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2303 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2304 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2305 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2306 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2307 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2308 if ((STp->device)->scsi_level >= SCSI_2)
2309 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2310 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2311 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2312 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2313 STm->sysv = (options & MT_ST_SYSV) != 0;
2314 STp->sili = (options & MT_ST_SILI) != 0;
2315 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2316 st_log_options(STp, STm); )
2317 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2318 value = (code == MT_ST_SETBOOLEANS);
2319 if ((options & MT_ST_BUFFER_WRITES) != 0)
2320 STm->do_buffer_writes = value;
2321 if ((options & MT_ST_ASYNC_WRITES) != 0)
2322 STm->do_async_writes = value;
2323 if ((options & MT_ST_DEF_WRITES) != 0)
2324 STm->defaults_for_writes = value;
2325 if ((options & MT_ST_READ_AHEAD) != 0)
2326 STm->do_read_ahead = value;
2327 if ((options & MT_ST_TWO_FM) != 0)
2328 STp->two_fm = value;
2329 if ((options & MT_ST_FAST_MTEOM) != 0)
2330 STp->fast_mteom = value;
2331 if ((options & MT_ST_AUTO_LOCK) != 0)
2332 STp->do_auto_lock = value;
2333 if ((options & MT_ST_CAN_BSR) != 0)
2334 STp->can_bsr = value;
2335 if ((options & MT_ST_NO_BLKLIMS) != 0)
2336 STp->omit_blklims = value;
2337 if ((STp->device)->scsi_level >= SCSI_2 &&
2338 (options & MT_ST_CAN_PARTITIONS) != 0)
2339 STp->can_partitions = value;
2340 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2341 STp->scsi2_logical = value;
2342 if ((options & MT_ST_NOWAIT) != 0)
2343 STp->immediate = value;
2344 if ((options & MT_ST_NOWAIT_EOF) != 0)
2345 STp->immediate_filemark = value;
2346 if ((options & MT_ST_SYSV) != 0)
2347 STm->sysv = value;
2348 if ((options & MT_ST_SILI) != 0)
2349 STp->sili = value;
2350 DEB(
2351 if ((options & MT_ST_DEBUGGING) != 0)
2352 debugging = value;
2353 st_log_options(STp, STm); )
2354 } else if (code == MT_ST_WRITE_THRESHOLD) {
2355 /* Retained for compatibility */
2356 } else if (code == MT_ST_DEF_BLKSIZE) {
2357 value = (options & ~MT_ST_OPTIONS);
2358 if (value == ~MT_ST_OPTIONS) {
2359 STm->default_blksize = (-1);
2360 DEBC_printk(STp, "Default block size disabled.\n");
2361 } else {
2362 STm->default_blksize = value;
2363 DEBC_printk(STp,"Default block size set to "
2364 "%d bytes.\n", STm->default_blksize);
2365 if (STp->ready == ST_READY) {
2366 STp->blksize_changed = 0;
2367 set_mode_densblk(STp, STm);
2368 }
2369 }
2370 } else if (code == MT_ST_TIMEOUTS) {
2371 value = (options & ~MT_ST_OPTIONS);
2372 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2373 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2374 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2375 (value & ~MT_ST_SET_LONG_TIMEOUT));
2376 } else {
2377 blk_queue_rq_timeout(STp->device->request_queue,
2378 value * HZ);
2379 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2380 value);
2381 }
2382 } else if (code == MT_ST_SET_CLN) {
2383 value = (options & ~MT_ST_OPTIONS) & 0xff;
2384 if (value != 0 &&
2385 (value < EXTENDED_SENSE_START ||
2386 value >= SCSI_SENSE_BUFFERSIZE))
2387 return (-EINVAL);
2388 STp->cln_mode = value;
2389 STp->cln_sense_mask = (options >> 8) & 0xff;
2390 STp->cln_sense_value = (options >> 16) & 0xff;
2391 st_printk(KERN_INFO, STp,
2392 "Cleaning request mode %d, mask %02x, value %02x\n",
2393 value, STp->cln_sense_mask, STp->cln_sense_value);
2394 } else if (code == MT_ST_DEF_OPTIONS) {
2395 code = (options & ~MT_ST_CLEAR_DEFAULT);
2396 value = (options & MT_ST_CLEAR_DEFAULT);
2397 if (code == MT_ST_DEF_DENSITY) {
2398 if (value == MT_ST_CLEAR_DEFAULT) {
2399 STm->default_density = (-1);
2400 DEBC_printk(STp,
2401 "Density default disabled.\n");
2402 } else {
2403 STm->default_density = value & 0xff;
2404 DEBC_printk(STp, "Density default set to %x\n",
2405 STm->default_density);
2406 if (STp->ready == ST_READY) {
2407 STp->density_changed = 0;
2408 set_mode_densblk(STp, STm);
2409 }
2410 }
2411 } else if (code == MT_ST_DEF_DRVBUFFER) {
2412 if (value == MT_ST_CLEAR_DEFAULT) {
2413 STp->default_drvbuffer = 0xff;
2414 DEBC_printk(STp,
2415 "Drive buffer default disabled.\n");
2416 } else {
2417 STp->default_drvbuffer = value & 7;
2418 DEBC_printk(STp,
2419 "Drive buffer default set to %x\n",
2420 STp->default_drvbuffer);
2421 if (STp->ready == ST_READY)
2422 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2423 }
2424 } else if (code == MT_ST_DEF_COMPRESSION) {
2425 if (value == MT_ST_CLEAR_DEFAULT) {
2426 STm->default_compression = ST_DONT_TOUCH;
2427 DEBC_printk(STp,
2428 "Compression default disabled.\n");
2429 } else {
2430 if ((value & 0xff00) != 0) {
2431 STp->c_algo = (value & 0xff00) >> 8;
2432 DEBC_printk(STp, "Compression "
2433 "algorithm set to 0x%x.\n",
2434 STp->c_algo);
2435 }
2436 if ((value & 0xff) != 0xff) {
2437 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2438 DEBC_printk(STp, "Compression default "
2439 "set to %x\n",
2440 (value & 1));
2441 if (STp->ready == ST_READY) {
2442 STp->compression_changed = 0;
2443 st_compression(STp, (STm->default_compression == ST_YES));
2444 }
2445 }
2446 }
2447 }
2448 } else
2449 return (-EIO);
2450
2451 return 0;
2452}
2453
2454#define MODE_HEADER_LENGTH 4
2455
2456/* Mode header and page byte offsets */
2457#define MH_OFF_DATA_LENGTH 0
2458#define MH_OFF_MEDIUM_TYPE 1
2459#define MH_OFF_DEV_SPECIFIC 2
2460#define MH_OFF_BDESCS_LENGTH 3
2461#define MP_OFF_PAGE_NBR 0
2462#define MP_OFF_PAGE_LENGTH 1
2463
2464/* Mode header and page bit masks */
2465#define MH_BIT_WP 0x80
2466#define MP_MSK_PAGE_NBR 0x3f
2467
2468/* Don't return block descriptors */
2469#define MODE_SENSE_OMIT_BDESCS 0x08
2470
2471#define MODE_SELECT_PAGE_FORMAT 0x10
2472
2473/* Read a mode page into the tape buffer. The block descriptors are included
2474 if incl_block_descs is true. The page control is ored to the page number
2475 parameter, if necessary. */
2476static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2477{
2478 unsigned char cmd[MAX_COMMAND_SIZE];
2479 struct st_request *SRpnt;
2480
2481 memset(cmd, 0, MAX_COMMAND_SIZE);
2482 cmd[0] = MODE_SENSE;
2483 if (omit_block_descs)
2484 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2485 cmd[2] = page;
2486 cmd[4] = 255;
2487
2488 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2489 STp->device->request_queue->rq_timeout, 0, 1);
2490 if (SRpnt == NULL)
2491 return (STp->buffer)->syscall_result;
2492
2493 st_release_request(SRpnt);
2494
2495 return STp->buffer->syscall_result;
2496}
2497
2498
2499/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2500 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2501static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2502{
2503 int pgo;
2504 unsigned char cmd[MAX_COMMAND_SIZE];
2505 struct st_request *SRpnt;
2506 int timeout;
2507
2508 memset(cmd, 0, MAX_COMMAND_SIZE);
2509 cmd[0] = MODE_SELECT;
2510 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2511 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2512 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2513
2514 /* Clear reserved fields */
2515 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2516 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2517 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2518 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2519
2520 timeout = slow ?
2521 STp->long_timeout : STp->device->request_queue->rq_timeout;
2522 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2523 timeout, 0, 1);
2524 if (SRpnt == NULL)
2525 return (STp->buffer)->syscall_result;
2526
2527 st_release_request(SRpnt);
2528
2529 return STp->buffer->syscall_result;
2530}
2531
2532
2533#define COMPRESSION_PAGE 0x0f
2534#define COMPRESSION_PAGE_LENGTH 16
2535
2536#define CP_OFF_DCE_DCC 2
2537#define CP_OFF_C_ALGO 7
2538
2539#define DCE_MASK 0x80
2540#define DCC_MASK 0x40
2541#define RED_MASK 0x60
2542
2543
2544/* Control the compression with mode page 15. Algorithm not changed if zero.
2545
2546 The block descriptors are read and written because Sony SDT-7000 does not
2547 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2548 Including block descriptors should not cause any harm to other drives. */
2549
2550static int st_compression(struct scsi_tape * STp, int state)
2551{
2552 int retval;
2553 int mpoffs; /* Offset to mode page start */
2554 unsigned char *b_data = (STp->buffer)->b_data;
2555
2556 if (STp->ready != ST_READY)
2557 return (-EIO);
2558
2559 /* Read the current page contents */
2560 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2561 if (retval) {
2562 DEBC_printk(STp, "Compression mode page not supported.\n");
2563 return (-EIO);
2564 }
2565
2566 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2567 DEBC_printk(STp, "Compression state is %d.\n",
2568 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2569
2570 /* Check if compression can be changed */
2571 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2572 DEBC_printk(STp, "Compression not supported.\n");
2573 return (-EIO);
2574 }
2575
2576 /* Do the change */
2577 if (state) {
2578 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2579 if (STp->c_algo != 0)
2580 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2581 }
2582 else {
2583 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2584 if (STp->c_algo != 0)
2585 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2586 }
2587
2588 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2589 if (retval) {
2590 DEBC_printk(STp, "Compression change failed.\n");
2591 return (-EIO);
2592 }
2593 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2594
2595 STp->compression_changed = 1;
2596 return 0;
2597}
2598
2599
2600/* Process the load and unload commands (does unload if the load code is zero) */
2601static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2602{
2603 int retval = (-EIO), timeout;
2604 unsigned char cmd[MAX_COMMAND_SIZE];
2605 struct st_partstat *STps;
2606 struct st_request *SRpnt;
2607
2608 if (STp->ready != ST_READY && !load_code) {
2609 if (STp->ready == ST_NO_TAPE)
2610 return (-ENOMEDIUM);
2611 else
2612 return (-EIO);
2613 }
2614
2615 memset(cmd, 0, MAX_COMMAND_SIZE);
2616 cmd[0] = START_STOP;
2617 if (load_code)
2618 cmd[4] |= 1;
2619 /*
2620 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2621 */
2622 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2623 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2624 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2625 (cmd[4]) ? "" : "un",
2626 load_code - MT_ST_HPLOADER_OFFSET);
2627 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2628 }
2629 if (STp->immediate) {
2630 cmd[1] = 1; /* Don't wait for completion */
2631 timeout = STp->device->request_queue->rq_timeout;
2632 }
2633 else
2634 timeout = STp->long_timeout;
2635
2636 DEBC(
2637 if (!load_code)
2638 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2639 else
2640 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2641 );
2642
2643 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2644 timeout, MAX_RETRIES, 1);
2645 if (!SRpnt)
2646 return (STp->buffer)->syscall_result;
2647
2648 retval = (STp->buffer)->syscall_result;
2649 st_release_request(SRpnt);
2650
2651 if (!retval) { /* SCSI command successful */
2652
2653 if (!load_code) {
2654 STp->rew_at_close = 0;
2655 STp->ready = ST_NO_TAPE;
2656 }
2657 else {
2658 STp->rew_at_close = STp->autorew_dev;
2659 retval = check_tape(STp, filp);
2660 if (retval > 0)
2661 retval = 0;
2662 }
2663 }
2664 else {
2665 STps = &(STp->ps[STp->partition]);
2666 STps->drv_file = STps->drv_block = (-1);
2667 }
2668
2669 return retval;
2670}
2671
2672#if DEBUG
2673#define ST_DEB_FORWARD 0
2674#define ST_DEB_BACKWARD 1
2675static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2676{
2677 s32 sc;
2678
2679 if (!debugging)
2680 return;
2681
2682 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2683 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2684 if (direction)
2685 sc = -sc;
2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2687 direction ? "backward" : "forward", sc, units);
2688}
2689#else
2690#define ST_DEB_FORWARD 0
2691#define ST_DEB_BACKWARD 1
2692static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2693#endif
2694
2695
2696/* Internal ioctl function */
2697static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2698{
2699 int timeout;
2700 long ltmp;
2701 int ioctl_result;
2702 int chg_eof = 1;
2703 unsigned char cmd[MAX_COMMAND_SIZE];
2704 struct st_request *SRpnt;
2705 struct st_partstat *STps;
2706 int fileno, blkno, at_sm, undone;
2707 int datalen = 0, direction = DMA_NONE;
2708
2709 WARN_ON(STp->buffer->do_dio != 0);
2710 if (STp->ready != ST_READY) {
2711 if (STp->ready == ST_NO_TAPE)
2712 return (-ENOMEDIUM);
2713 else
2714 return (-EIO);
2715 }
2716 timeout = STp->long_timeout;
2717 STps = &(STp->ps[STp->partition]);
2718 fileno = STps->drv_file;
2719 blkno = STps->drv_block;
2720 at_sm = STps->at_sm;
2721
2722 memset(cmd, 0, MAX_COMMAND_SIZE);
2723 switch (cmd_in) {
2724 case MTFSFM:
2725 chg_eof = 0; /* Changed from the FSF after this */
2726 case MTFSF:
2727 cmd[0] = SPACE;
2728 cmd[1] = 0x01; /* Space FileMarks */
2729 cmd[2] = (arg >> 16);
2730 cmd[3] = (arg >> 8);
2731 cmd[4] = arg;
2732 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2733 if (fileno >= 0)
2734 fileno += arg;
2735 blkno = 0;
2736 at_sm &= (arg == 0);
2737 break;
2738 case MTBSFM:
2739 chg_eof = 0; /* Changed from the FSF after this */
2740 case MTBSF:
2741 cmd[0] = SPACE;
2742 cmd[1] = 0x01; /* Space FileMarks */
2743 ltmp = (-arg);
2744 cmd[2] = (ltmp >> 16);
2745 cmd[3] = (ltmp >> 8);
2746 cmd[4] = ltmp;
2747 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2748 if (fileno >= 0)
2749 fileno -= arg;
2750 blkno = (-1); /* We can't know the block number */
2751 at_sm &= (arg == 0);
2752 break;
2753 case MTFSR:
2754 cmd[0] = SPACE;
2755 cmd[1] = 0x00; /* Space Blocks */
2756 cmd[2] = (arg >> 16);
2757 cmd[3] = (arg >> 8);
2758 cmd[4] = arg;
2759 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2760 if (blkno >= 0)
2761 blkno += arg;
2762 at_sm &= (arg == 0);
2763 break;
2764 case MTBSR:
2765 cmd[0] = SPACE;
2766 cmd[1] = 0x00; /* Space Blocks */
2767 ltmp = (-arg);
2768 cmd[2] = (ltmp >> 16);
2769 cmd[3] = (ltmp >> 8);
2770 cmd[4] = ltmp;
2771 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2772 if (blkno >= 0)
2773 blkno -= arg;
2774 at_sm &= (arg == 0);
2775 break;
2776 case MTFSS:
2777 cmd[0] = SPACE;
2778 cmd[1] = 0x04; /* Space Setmarks */
2779 cmd[2] = (arg >> 16);
2780 cmd[3] = (arg >> 8);
2781 cmd[4] = arg;
2782 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2783 if (arg != 0) {
2784 blkno = fileno = (-1);
2785 at_sm = 1;
2786 }
2787 break;
2788 case MTBSS:
2789 cmd[0] = SPACE;
2790 cmd[1] = 0x04; /* Space Setmarks */
2791 ltmp = (-arg);
2792 cmd[2] = (ltmp >> 16);
2793 cmd[3] = (ltmp >> 8);
2794 cmd[4] = ltmp;
2795 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2796 if (arg != 0) {
2797 blkno = fileno = (-1);
2798 at_sm = 1;
2799 }
2800 break;
2801 case MTWEOF:
2802 case MTWEOFI:
2803 case MTWSM:
2804 if (STp->write_prot)
2805 return (-EACCES);
2806 cmd[0] = WRITE_FILEMARKS;
2807 if (cmd_in == MTWSM)
2808 cmd[1] = 2;
2809 if (cmd_in == MTWEOFI ||
2810 (cmd_in == MTWEOF && STp->immediate_filemark))
2811 cmd[1] |= 1;
2812 cmd[2] = (arg >> 16);
2813 cmd[3] = (arg >> 8);
2814 cmd[4] = arg;
2815 timeout = STp->device->request_queue->rq_timeout;
2816 DEBC(
2817 if (cmd_in != MTWSM)
2818 st_printk(ST_DEB_MSG, STp,
2819 "Writing %d filemarks.\n",
2820 cmd[2] * 65536 +
2821 cmd[3] * 256 +
2822 cmd[4]);
2823 else
2824 st_printk(ST_DEB_MSG, STp,
2825 "Writing %d setmarks.\n",
2826 cmd[2] * 65536 +
2827 cmd[3] * 256 +
2828 cmd[4]);
2829 )
2830 if (fileno >= 0)
2831 fileno += arg;
2832 blkno = 0;
2833 at_sm = (cmd_in == MTWSM);
2834 break;
2835 case MTREW:
2836 cmd[0] = REZERO_UNIT;
2837 if (STp->immediate) {
2838 cmd[1] = 1; /* Don't wait for completion */
2839 timeout = STp->device->request_queue->rq_timeout;
2840 }
2841 DEBC_printk(STp, "Rewinding tape.\n");
2842 fileno = blkno = at_sm = 0;
2843 break;
2844 case MTNOP:
2845 DEBC_printk(STp, "No op on tape.\n");
2846 return 0; /* Should do something ? */
2847 break;
2848 case MTRETEN:
2849 cmd[0] = START_STOP;
2850 if (STp->immediate) {
2851 cmd[1] = 1; /* Don't wait for completion */
2852 timeout = STp->device->request_queue->rq_timeout;
2853 }
2854 cmd[4] = 3;
2855 DEBC_printk(STp, "Retensioning tape.\n");
2856 fileno = blkno = at_sm = 0;
2857 break;
2858 case MTEOM:
2859 if (!STp->fast_mteom) {
2860 /* space to the end of tape */
2861 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2862 fileno = STps->drv_file;
2863 if (STps->eof >= ST_EOD_1)
2864 return 0;
2865 /* The next lines would hide the number of spaced FileMarks
2866 That's why I inserted the previous lines. I had no luck
2867 with detecting EOM with FSF, so we go now to EOM.
2868 Joerg Weule */
2869 } else
2870 fileno = (-1);
2871 cmd[0] = SPACE;
2872 cmd[1] = 3;
2873 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2874 blkno = -1;
2875 at_sm = 0;
2876 break;
2877 case MTERASE:
2878 if (STp->write_prot)
2879 return (-EACCES);
2880 cmd[0] = ERASE;
2881 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2882 if (STp->immediate) {
2883 cmd[1] |= 2; /* Don't wait for completion */
2884 timeout = STp->device->request_queue->rq_timeout;
2885 }
2886 else
2887 timeout = STp->long_timeout * 8;
2888
2889 DEBC_printk(STp, "Erasing tape.\n");
2890 fileno = blkno = at_sm = 0;
2891 break;
2892 case MTSETBLK: /* Set block length */
2893 case MTSETDENSITY: /* Set tape density */
2894 case MTSETDRVBUFFER: /* Set drive buffering */
2895 case SET_DENS_AND_BLK: /* Set density and block size */
2896 chg_eof = 0;
2897 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2898 return (-EIO); /* Not allowed if data in buffer */
2899 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2900 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2901 STp->max_block > 0 &&
2902 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2903 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2904 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2905 return (-EINVAL);
2906 }
2907 cmd[0] = MODE_SELECT;
2908 if ((STp->use_pf & USE_PF))
2909 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2910 cmd[4] = datalen = 12;
2911 direction = DMA_TO_DEVICE;
2912
2913 memset((STp->buffer)->b_data, 0, 12);
2914 if (cmd_in == MTSETDRVBUFFER)
2915 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2916 else
2917 (STp->buffer)->b_data[2] =
2918 STp->drv_buffer << 4;
2919 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2920 if (cmd_in == MTSETDENSITY) {
2921 (STp->buffer)->b_data[4] = arg;
2922 STp->density_changed = 1; /* At least we tried ;-) */
2923 } else if (cmd_in == SET_DENS_AND_BLK)
2924 (STp->buffer)->b_data[4] = arg >> 24;
2925 else
2926 (STp->buffer)->b_data[4] = STp->density;
2927 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2928 ltmp = arg & MT_ST_BLKSIZE_MASK;
2929 if (cmd_in == MTSETBLK)
2930 STp->blksize_changed = 1; /* At least we tried ;-) */
2931 } else
2932 ltmp = STp->block_size;
2933 (STp->buffer)->b_data[9] = (ltmp >> 16);
2934 (STp->buffer)->b_data[10] = (ltmp >> 8);
2935 (STp->buffer)->b_data[11] = ltmp;
2936 timeout = STp->device->request_queue->rq_timeout;
2937 DEBC(
2938 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2939 st_printk(ST_DEB_MSG, STp,
2940 "Setting block size to %d bytes.\n",
2941 (STp->buffer)->b_data[9] * 65536 +
2942 (STp->buffer)->b_data[10] * 256 +
2943 (STp->buffer)->b_data[11]);
2944 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2945 st_printk(ST_DEB_MSG, STp,
2946 "Setting density code to %x.\n",
2947 (STp->buffer)->b_data[4]);
2948 if (cmd_in == MTSETDRVBUFFER)
2949 st_printk(ST_DEB_MSG, STp,
2950 "Setting drive buffer code to %d.\n",
2951 ((STp->buffer)->b_data[2] >> 4) & 7);
2952 )
2953 break;
2954 default:
2955 return (-ENOSYS);
2956 }
2957
2958 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2959 timeout, MAX_RETRIES, 1);
2960 if (!SRpnt)
2961 return (STp->buffer)->syscall_result;
2962
2963 ioctl_result = (STp->buffer)->syscall_result;
2964
2965 if (!ioctl_result) { /* SCSI command successful */
2966 st_release_request(SRpnt);
2967 SRpnt = NULL;
2968 STps->drv_block = blkno;
2969 STps->drv_file = fileno;
2970 STps->at_sm = at_sm;
2971
2972 if (cmd_in == MTBSFM)
2973 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2974 else if (cmd_in == MTFSFM)
2975 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2976
2977 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2978 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2979 if (STp->block_size != 0) {
2980 (STp->buffer)->buffer_blocks =
2981 (STp->buffer)->buffer_size / STp->block_size;
2982 }
2983 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2984 if (cmd_in == SET_DENS_AND_BLK)
2985 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2986 } else if (cmd_in == MTSETDRVBUFFER)
2987 STp->drv_buffer = (arg & 7);
2988 else if (cmd_in == MTSETDENSITY)
2989 STp->density = arg;
2990
2991 if (cmd_in == MTEOM)
2992 STps->eof = ST_EOD;
2993 else if (cmd_in == MTFSF)
2994 STps->eof = ST_FM;
2995 else if (chg_eof)
2996 STps->eof = ST_NOEOF;
2997
2998 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2999 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3000 } else { /* SCSI command was not completely successful. Don't return
3001 from this block without releasing the SCSI command block! */
3002 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3003
3004 if (cmdstatp->flags & SENSE_EOM) {
3005 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3006 cmd_in != MTBSR && cmd_in != MTBSS)
3007 STps->eof = ST_EOM_OK;
3008 STps->drv_block = 0;
3009 }
3010
3011 if (cmdstatp->remainder_valid)
3012 undone = (int)cmdstatp->uremainder64;
3013 else
3014 undone = 0;
3015
3016 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3017 cmdstatp->have_sense &&
3018 (cmdstatp->flags & SENSE_EOM)) {
3019 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3020 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3021 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3022 STps->eof = ST_NOEOF;
3023 } else { /* Writing EOF(s) failed */
3024 if (fileno >= 0)
3025 fileno -= undone;
3026 if (undone < arg)
3027 STps->eof = ST_NOEOF;
3028 }
3029 STps->drv_file = fileno;
3030 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3031 if (fileno >= 0)
3032 STps->drv_file = fileno - undone;
3033 else
3034 STps->drv_file = fileno;
3035 STps->drv_block = -1;
3036 STps->eof = ST_NOEOF;
3037 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3038 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3039 undone = (-undone);
3040 if (STps->drv_file >= 0)
3041 STps->drv_file = fileno + undone;
3042 STps->drv_block = 0;
3043 STps->eof = ST_NOEOF;
3044 } else if (cmd_in == MTFSR) {
3045 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3046 if (STps->drv_file >= 0)
3047 STps->drv_file++;
3048 STps->drv_block = 0;
3049 STps->eof = ST_FM;
3050 } else {
3051 if (blkno >= undone)
3052 STps->drv_block = blkno - undone;
3053 else
3054 STps->drv_block = (-1);
3055 STps->eof = ST_NOEOF;
3056 }
3057 } else if (cmd_in == MTBSR) {
3058 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3059 STps->drv_file--;
3060 STps->drv_block = (-1);
3061 } else {
3062 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3063 undone = (-undone);
3064 if (STps->drv_block >= 0)
3065 STps->drv_block = blkno + undone;
3066 }
3067 STps->eof = ST_NOEOF;
3068 } else if (cmd_in == MTEOM) {
3069 STps->drv_file = (-1);
3070 STps->drv_block = (-1);
3071 STps->eof = ST_EOD;
3072 } else if (cmd_in == MTSETBLK ||
3073 cmd_in == MTSETDENSITY ||
3074 cmd_in == MTSETDRVBUFFER ||
3075 cmd_in == SET_DENS_AND_BLK) {
3076 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3077 !(STp->use_pf & PF_TESTED)) {
3078 /* Try the other possible state of Page Format if not
3079 already tried */
3080 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3081 st_release_request(SRpnt);
3082 SRpnt = NULL;
3083 return st_int_ioctl(STp, cmd_in, arg);
3084 }
3085 } else if (chg_eof)
3086 STps->eof = ST_NOEOF;
3087
3088 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3089 STps->eof = ST_EOD;
3090
3091 st_release_request(SRpnt);
3092 SRpnt = NULL;
3093 }
3094
3095 return ioctl_result;
3096}
3097
3098
3099/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3100 structure. */
3101
3102static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3103 int logical)
3104{
3105 int result;
3106 unsigned char scmd[MAX_COMMAND_SIZE];
3107 struct st_request *SRpnt;
3108
3109 if (STp->ready != ST_READY)
3110 return (-EIO);
3111
3112 memset(scmd, 0, MAX_COMMAND_SIZE);
3113 if ((STp->device)->scsi_level < SCSI_2) {
3114 scmd[0] = QFA_REQUEST_BLOCK;
3115 scmd[4] = 3;
3116 } else {
3117 scmd[0] = READ_POSITION;
3118 if (!logical && !STp->scsi2_logical)
3119 scmd[1] = 1;
3120 }
3121 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3122 STp->device->request_queue->rq_timeout,
3123 MAX_READY_RETRIES, 1);
3124 if (!SRpnt)
3125 return (STp->buffer)->syscall_result;
3126
3127 if ((STp->buffer)->syscall_result != 0 ||
3128 (STp->device->scsi_level >= SCSI_2 &&
3129 ((STp->buffer)->b_data[0] & 4) != 0)) {
3130 *block = *partition = 0;
3131 DEBC_printk(STp, " Can't read tape position.\n");
3132 result = (-EIO);
3133 } else {
3134 result = 0;
3135 if ((STp->device)->scsi_level < SCSI_2) {
3136 *block = ((STp->buffer)->b_data[0] << 16)
3137 + ((STp->buffer)->b_data[1] << 8)
3138 + (STp->buffer)->b_data[2];
3139 *partition = 0;
3140 } else {
3141 *block = ((STp->buffer)->b_data[4] << 24)
3142 + ((STp->buffer)->b_data[5] << 16)
3143 + ((STp->buffer)->b_data[6] << 8)
3144 + (STp->buffer)->b_data[7];
3145 *partition = (STp->buffer)->b_data[1];
3146 if (((STp->buffer)->b_data[0] & 0x80) &&
3147 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3148 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3149 }
3150 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3151 *block, *partition);
3152 }
3153 st_release_request(SRpnt);
3154 SRpnt = NULL;
3155
3156 return result;
3157}
3158
3159
3160/* Set the tape block and partition. Negative partition means that only the
3161 block should be set in vendor specific way. */
3162static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3163 int logical)
3164{
3165 struct st_partstat *STps;
3166 int result, p;
3167 unsigned int blk;
3168 int timeout;
3169 unsigned char scmd[MAX_COMMAND_SIZE];
3170 struct st_request *SRpnt;
3171
3172 if (STp->ready != ST_READY)
3173 return (-EIO);
3174 timeout = STp->long_timeout;
3175 STps = &(STp->ps[STp->partition]);
3176
3177 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3178 block, partition);
3179 DEB(if (partition < 0)
3180 return (-EIO); )
3181
3182 /* Update the location at the partition we are leaving */
3183 if ((!STp->can_partitions && partition != 0) ||
3184 partition >= ST_NBR_PARTITIONS)
3185 return (-EINVAL);
3186 if (partition != STp->partition) {
3187 if (get_location(STp, &blk, &p, 1))
3188 STps->last_block_valid = 0;
3189 else {
3190 STps->last_block_valid = 1;
3191 STps->last_block_visited = blk;
3192 DEBC_printk(STp, "Visited block %d for "
3193 "partition %d saved.\n",
3194 blk, STp->partition);
3195 }
3196 }
3197
3198 memset(scmd, 0, MAX_COMMAND_SIZE);
3199 if ((STp->device)->scsi_level < SCSI_2) {
3200 scmd[0] = QFA_SEEK_BLOCK;
3201 scmd[2] = (block >> 16);
3202 scmd[3] = (block >> 8);
3203 scmd[4] = block;
3204 scmd[5] = 0;
3205 } else {
3206 scmd[0] = SEEK_10;
3207 scmd[3] = (block >> 24);
3208 scmd[4] = (block >> 16);
3209 scmd[5] = (block >> 8);
3210 scmd[6] = block;
3211 if (!logical && !STp->scsi2_logical)
3212 scmd[1] = 4;
3213 if (STp->partition != partition) {
3214 scmd[1] |= 2;
3215 scmd[8] = partition;
3216 DEBC_printk(STp, "Trying to change partition "
3217 "from %d to %d\n", STp->partition,
3218 partition);
3219 }
3220 }
3221 if (STp->immediate) {
3222 scmd[1] |= 1; /* Don't wait for completion */
3223 timeout = STp->device->request_queue->rq_timeout;
3224 }
3225
3226 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3227 timeout, MAX_READY_RETRIES, 1);
3228 if (!SRpnt)
3229 return (STp->buffer)->syscall_result;
3230
3231 STps->drv_block = STps->drv_file = (-1);
3232 STps->eof = ST_NOEOF;
3233 if ((STp->buffer)->syscall_result != 0) {
3234 result = (-EIO);
3235 if (STp->can_partitions &&
3236 (STp->device)->scsi_level >= SCSI_2 &&
3237 (p = find_partition(STp)) >= 0)
3238 STp->partition = p;
3239 } else {
3240 if (STp->can_partitions) {
3241 STp->partition = partition;
3242 STps = &(STp->ps[partition]);
3243 if (!STps->last_block_valid ||
3244 STps->last_block_visited != block) {
3245 STps->at_sm = 0;
3246 STps->rw = ST_IDLE;
3247 }
3248 } else
3249 STps->at_sm = 0;
3250 if (block == 0)
3251 STps->drv_block = STps->drv_file = 0;
3252 result = 0;
3253 }
3254
3255 st_release_request(SRpnt);
3256 SRpnt = NULL;
3257
3258 return result;
3259}
3260
3261
3262/* Find the current partition number for the drive status. Called from open and
3263 returns either partition number of negative error code. */
3264static int find_partition(struct scsi_tape *STp)
3265{
3266 int i, partition;
3267 unsigned int block;
3268
3269 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3270 return i;
3271 if (partition >= ST_NBR_PARTITIONS)
3272 return (-EIO);
3273 return partition;
3274}
3275
3276
3277/* Change the partition if necessary */
3278static int switch_partition(struct scsi_tape *STp)
3279{
3280 struct st_partstat *STps;
3281
3282 if (STp->partition == STp->new_partition)
3283 return 0;
3284 STps = &(STp->ps[STp->new_partition]);
3285 if (!STps->last_block_valid)
3286 STps->last_block_visited = 0;
3287 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3288}
3289
3290/* Functions for reading and writing the medium partition mode page. */
3291
3292#define PART_PAGE 0x11
3293#define PART_PAGE_FIXED_LENGTH 8
3294
3295#define PP_OFF_MAX_ADD_PARTS 2
3296#define PP_OFF_NBR_ADD_PARTS 3
3297#define PP_OFF_FLAGS 4
3298#define PP_OFF_PART_UNITS 6
3299#define PP_OFF_RESERVED 7
3300
3301#define PP_BIT_IDP 0x20
3302#define PP_BIT_FDP 0x80
3303#define PP_MSK_PSUM_MB 0x10
3304#define PP_MSK_PSUM_UNITS 0x18
3305#define PP_MSK_POFM 0x04
3306
3307/* Get the number of partitions on the tape. As a side effect reads the
3308 mode page into the tape buffer. */
3309static int nbr_partitions(struct scsi_tape *STp)
3310{
3311 int result;
3312
3313 if (STp->ready != ST_READY)
3314 return (-EIO);
3315
3316 result = read_mode_page(STp, PART_PAGE, 1);
3317
3318 if (result) {
3319 DEBC_printk(STp, "Can't read medium partition page.\n");
3320 result = (-EIO);
3321 } else {
3322 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3323 PP_OFF_NBR_ADD_PARTS] + 1;
3324 DEBC_printk(STp, "Number of partitions %d.\n", result);
3325 }
3326
3327 return result;
3328}
3329
3330
3331static int format_medium(struct scsi_tape *STp, int format)
3332{
3333 int result = 0;
3334 int timeout = STp->long_timeout;
3335 unsigned char scmd[MAX_COMMAND_SIZE];
3336 struct st_request *SRpnt;
3337
3338 memset(scmd, 0, MAX_COMMAND_SIZE);
3339 scmd[0] = FORMAT_UNIT;
3340 scmd[2] = format;
3341 if (STp->immediate) {
3342 scmd[1] |= 1; /* Don't wait for completion */
3343 timeout = STp->device->request_queue->rq_timeout;
3344 }
3345 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3346 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3347 timeout, MAX_RETRIES, 1);
3348 if (!SRpnt)
3349 result = STp->buffer->syscall_result;
3350 return result;
3351}
3352
3353
3354/* Partition the tape into two partitions if size > 0 or one partition if
3355 size == 0.
3356
3357 The block descriptors are read and written because Sony SDT-7000 does not
3358 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3359
3360 My HP C1533A drive returns only one partition size field. This is used to
3361 set the size of partition 1. There is no size field for the default partition.
3362 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3363 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3364 The following algorithm is used to accommodate both drives: if the number of
3365 partition size fields is greater than the maximum number of additional partitions
3366 in the mode page, the second field is used. Otherwise the first field is used.
3367
3368 For Seagate DDS drives the page length must be 8 when no partitions is defined
3369 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3370 is acceptable also to some other old drives and enforced if the first partition
3371 size field is used for the first additional partition size.
3372
3373 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3374 */
3375static int partition_tape(struct scsi_tape *STp, int size)
3376{
3377 int result;
3378 int target_partition;
3379 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3380 int pgo, psd_cnt, psdo;
3381 int psum = PP_MSK_PSUM_MB, units = 0;
3382 unsigned char *bp;
3383
3384 result = read_mode_page(STp, PART_PAGE, 0);
3385 if (result) {
3386 DEBC_printk(STp, "Can't read partition mode page.\n");
3387 return result;
3388 }
3389 target_partition = 1;
3390 if (size < 0) {
3391 target_partition = 0;
3392 size = -size;
3393 }
3394
3395 /* The mode page is in the buffer. Let's modify it and write it. */
3396 bp = (STp->buffer)->b_data;
3397 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3398 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3399 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3400
3401 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3402
3403 if (scsi3) {
3404 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3405 if (needs_format && size == 0) {
3406 /* No need to write the mode page when clearing
3407 * partitioning
3408 */
3409 DEBC_printk(STp, "Formatting tape with one partition.\n");
3410 result = format_medium(STp, 0);
3411 goto out;
3412 }
3413 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3414 psd_cnt = 2;
3415 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3416 /* Use units scaling for large partitions if the device
3417 * suggests it and no precision lost. Required for IBM
3418 * TS1140/50 drives that don't support MB units.
3419 */
3420 if (size >= 1000 && (size % 1000) == 0) {
3421 size /= 1000;
3422 psum = PP_MSK_PSUM_UNITS;
3423 units = 9; /* GB */
3424 }
3425 }
3426 /* Try it anyway if too large to specify in MB */
3427 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3428 size /= 1000;
3429 psum = PP_MSK_PSUM_UNITS;
3430 units = 9; /* GB */
3431 }
3432 }
3433
3434 if (size >= 65535 || /* Does not fit into two bytes */
3435 (target_partition == 0 && psd_cnt < 2)) {
3436 result = -EINVAL;
3437 goto out;
3438 }
3439
3440 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3441 /* The second condition is for HP DDS which use only one partition size
3442 * descriptor
3443 */
3444 if (target_partition > 0 &&
3445 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3446 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3447 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3448 psdo += 2;
3449 }
3450 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3451
3452 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3453 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3454 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3455
3456 if (size == 0) {
3457 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3458 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3459 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3460 DEBC_printk(STp, "Formatting tape with one partition.\n");
3461 } else {
3462 bp[psdo] = (size >> 8) & 0xff;
3463 bp[psdo + 1] = size & 0xff;
3464 if (target_partition == 0)
3465 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3466 bp[pgo + 3] = 1;
3467 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3468 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3469 DEBC_printk(STp,
3470 "Formatting tape with two partitions (%i = %d MB).\n",
3471 target_partition, units > 0 ? size * 1000 : size);
3472 }
3473 bp[pgo + PP_OFF_PART_UNITS] = 0;
3474 bp[pgo + PP_OFF_RESERVED] = 0;
3475 if (size != 1 || units != 0) {
3476 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3477 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3478 bp[pgo + PP_OFF_PART_UNITS] = units;
3479 } else
3480 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3481 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3482 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3483
3484 result = write_mode_page(STp, PART_PAGE, 1);
3485
3486 if (!result && needs_format)
3487 result = format_medium(STp, 1);
3488
3489 if (result) {
3490 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3491 result = (-EIO);
3492 }
3493
3494out:
3495 return result;
3496}
3497
3498
3499
3500/* The ioctl command */
3501static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3502{
3503 int i, cmd_nr, cmd_type, bt;
3504 int retval = 0;
3505 unsigned int blk;
3506 struct scsi_tape *STp = file->private_data;
3507 struct st_modedef *STm;
3508 struct st_partstat *STps;
3509 void __user *p = (void __user *)arg;
3510
3511 if (mutex_lock_interruptible(&STp->lock))
3512 return -ERESTARTSYS;
3513
3514 DEB(
3515 if (debugging && !STp->in_use) {
3516 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3517 retval = (-EIO);
3518 goto out;
3519 } ) /* end DEB */
3520
3521 STm = &(STp->modes[STp->current_mode]);
3522 STps = &(STp->ps[STp->partition]);
3523
3524 /*
3525 * If we are in the middle of error recovery, don't let anyone
3526 * else try and use this device. Also, if error recovery fails, it
3527 * may try and take the device offline, in which case all further
3528 * access to the device is prohibited.
3529 */
3530 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3531 file->f_flags & O_NDELAY);
3532 if (retval)
3533 goto out;
3534
3535 cmd_type = _IOC_TYPE(cmd_in);
3536 cmd_nr = _IOC_NR(cmd_in);
3537
3538 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3539 struct mtop mtc;
3540
3541 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3542 retval = (-EINVAL);
3543 goto out;
3544 }
3545
3546 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3547 if (i) {
3548 retval = (-EFAULT);
3549 goto out;
3550 }
3551
3552 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3553 st_printk(KERN_WARNING, STp,
3554 "MTSETDRVBUFFER only allowed for root.\n");
3555 retval = (-EPERM);
3556 goto out;
3557 }
3558 if (!STm->defined &&
3559 (mtc.mt_op != MTSETDRVBUFFER &&
3560 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3561 retval = (-ENXIO);
3562 goto out;
3563 }
3564
3565 if (!STp->pos_unknown) {
3566
3567 if (STps->eof == ST_FM_HIT) {
3568 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3569 mtc.mt_op == MTEOM) {
3570 mtc.mt_count -= 1;
3571 if (STps->drv_file >= 0)
3572 STps->drv_file += 1;
3573 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3574 mtc.mt_count += 1;
3575 if (STps->drv_file >= 0)
3576 STps->drv_file += 1;
3577 }
3578 }
3579
3580 if (mtc.mt_op == MTSEEK) {
3581 /* Old position must be restored if partition will be
3582 changed */
3583 i = !STp->can_partitions ||
3584 (STp->new_partition != STp->partition);
3585 } else {
3586 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3587 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3588 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3589 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3590 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3591 mtc.mt_op == MTCOMPRESSION;
3592 }
3593 i = flush_buffer(STp, i);
3594 if (i < 0) {
3595 retval = i;
3596 goto out;
3597 }
3598 if (STps->rw == ST_WRITING &&
3599 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3600 mtc.mt_op == MTSEEK ||
3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3602 i = st_int_ioctl(STp, MTWEOF, 1);
3603 if (i < 0) {
3604 retval = i;
3605 goto out;
3606 }
3607 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3608 mtc.mt_count++;
3609 STps->rw = ST_IDLE;
3610 }
3611
3612 } else {
3613 /*
3614 * If there was a bus reset, block further access
3615 * to this device. If the user wants to rewind the tape,
3616 * then reset the flag and allow access again.
3617 */
3618 if (mtc.mt_op != MTREW &&
3619 mtc.mt_op != MTOFFL &&
3620 mtc.mt_op != MTRETEN &&
3621 mtc.mt_op != MTERASE &&
3622 mtc.mt_op != MTSEEK &&
3623 mtc.mt_op != MTEOM) {
3624 retval = (-EIO);
3625 goto out;
3626 }
3627 reset_state(STp);
3628 /* remove this when the midlevel properly clears was_reset */
3629 STp->device->was_reset = 0;
3630 }
3631
3632 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3633 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3634 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3635 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3636
3637 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3638 do_door_lock(STp, 0); /* Ignore result! */
3639
3640 if (mtc.mt_op == MTSETDRVBUFFER &&
3641 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3642 retval = st_set_options(STp, mtc.mt_count);
3643 goto out;
3644 }
3645
3646 if (mtc.mt_op == MTSETPART) {
3647 if (!STp->can_partitions ||
3648 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3649 retval = (-EINVAL);
3650 goto out;
3651 }
3652 if (mtc.mt_count >= STp->nbr_partitions &&
3653 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3654 retval = (-EIO);
3655 goto out;
3656 }
3657 if (mtc.mt_count >= STp->nbr_partitions) {
3658 retval = (-EINVAL);
3659 goto out;
3660 }
3661 STp->new_partition = mtc.mt_count;
3662 retval = 0;
3663 goto out;
3664 }
3665
3666 if (mtc.mt_op == MTMKPART) {
3667 if (!STp->can_partitions) {
3668 retval = (-EINVAL);
3669 goto out;
3670 }
3671 i = do_load_unload(STp, file, 1);
3672 if (i < 0) {
3673 retval = i;
3674 goto out;
3675 }
3676 i = partition_tape(STp, mtc.mt_count);
3677 if (i < 0) {
3678 retval = i;
3679 goto out;
3680 }
3681 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3682 STp->ps[i].rw = ST_IDLE;
3683 STp->ps[i].at_sm = 0;
3684 STp->ps[i].last_block_valid = 0;
3685 }
3686 STp->partition = STp->new_partition = 0;
3687 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3688 STps->drv_block = STps->drv_file = 0;
3689 retval = 0;
3690 goto out;
3691 }
3692
3693 if (mtc.mt_op == MTSEEK) {
3694 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3695 if (!STp->can_partitions)
3696 STp->ps[0].rw = ST_IDLE;
3697 retval = i;
3698 goto out;
3699 }
3700
3701 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3702 retval = do_load_unload(STp, file, 0);
3703 goto out;
3704 }
3705
3706 if (mtc.mt_op == MTLOAD) {
3707 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3708 goto out;
3709 }
3710
3711 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3712 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3713 goto out;
3714 }
3715
3716 if (STp->can_partitions && STp->ready == ST_READY &&
3717 (i = switch_partition(STp)) < 0) {
3718 retval = i;
3719 goto out;
3720 }
3721
3722 if (mtc.mt_op == MTCOMPRESSION)
3723 retval = st_compression(STp, (mtc.mt_count & 1));
3724 else
3725 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3726 goto out;
3727 }
3728 if (!STm->defined) {
3729 retval = (-ENXIO);
3730 goto out;
3731 }
3732
3733 if ((i = flush_buffer(STp, 0)) < 0) {
3734 retval = i;
3735 goto out;
3736 }
3737 if (STp->can_partitions &&
3738 (i = switch_partition(STp)) < 0) {
3739 retval = i;
3740 goto out;
3741 }
3742
3743 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3744 struct mtget mt_status;
3745
3746 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3747 retval = (-EINVAL);
3748 goto out;
3749 }
3750
3751 mt_status.mt_type = STp->tape_type;
3752 mt_status.mt_dsreg =
3753 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3754 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3755 mt_status.mt_blkno = STps->drv_block;
3756 mt_status.mt_fileno = STps->drv_file;
3757 if (STp->block_size != 0) {
3758 if (STps->rw == ST_WRITING)
3759 mt_status.mt_blkno +=
3760 (STp->buffer)->buffer_bytes / STp->block_size;
3761 else if (STps->rw == ST_READING)
3762 mt_status.mt_blkno -=
3763 ((STp->buffer)->buffer_bytes +
3764 STp->block_size - 1) / STp->block_size;
3765 }
3766
3767 mt_status.mt_gstat = 0;
3768 if (STp->drv_write_prot)
3769 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3770 if (mt_status.mt_blkno == 0) {
3771 if (mt_status.mt_fileno == 0)
3772 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3773 else
3774 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3775 }
3776 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3777 mt_status.mt_resid = STp->partition;
3778 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3779 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3780 else if (STps->eof >= ST_EOM_OK)
3781 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3782 if (STp->density == 1)
3783 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3784 else if (STp->density == 2)
3785 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3786 else if (STp->density == 3)
3787 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3788 if (STp->ready == ST_READY)
3789 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3790 if (STp->ready == ST_NO_TAPE)
3791 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3792 if (STps->at_sm)
3793 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3794 if (STm->do_async_writes ||
3795 (STm->do_buffer_writes && STp->block_size != 0) ||
3796 STp->drv_buffer != 0)
3797 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3798 if (STp->cleaning_req)
3799 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3800
3801 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3802 if (i) {
3803 retval = (-EFAULT);
3804 goto out;
3805 }
3806
3807 STp->recover_reg = 0; /* Clear after read */
3808 retval = 0;
3809 goto out;
3810 } /* End of MTIOCGET */
3811 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3812 struct mtpos mt_pos;
3813 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3814 retval = (-EINVAL);
3815 goto out;
3816 }
3817 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3818 retval = i;
3819 goto out;
3820 }
3821 mt_pos.mt_blkno = blk;
3822 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3823 if (i)
3824 retval = (-EFAULT);
3825 goto out;
3826 }
3827 mutex_unlock(&STp->lock);
3828 switch (cmd_in) {
3829 case SCSI_IOCTL_GET_IDLUN:
3830 case SCSI_IOCTL_GET_BUS_NUMBER:
3831 break;
3832 default:
3833 if ((cmd_in == SG_IO ||
3834 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3835 cmd_in == CDROM_SEND_PACKET) &&
3836 !capable(CAP_SYS_RAWIO))
3837 i = -EPERM;
3838 else
3839 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3840 file->f_mode, cmd_in, p);
3841 if (i != -ENOTTY)
3842 return i;
3843 break;
3844 }
3845 retval = scsi_ioctl(STp->device, cmd_in, p);
3846 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3847 STp->rew_at_close = 0;
3848 STp->ready = ST_NO_TAPE;
3849 }
3850 return retval;
3851
3852 out:
3853 mutex_unlock(&STp->lock);
3854 return retval;
3855}
3856
3857#ifdef CONFIG_COMPAT
3858static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3859{
3860 struct scsi_tape *STp = file->private_data;
3861 struct scsi_device *sdev = STp->device;
3862 int ret = -ENOIOCTLCMD;
3863 if (sdev->host->hostt->compat_ioctl) {
3864
3865 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3866
3867 }
3868 return ret;
3869}
3870#endif
3871
3872
3873
3874/* Try to allocate a new tape buffer. Calling function must not hold
3875 dev_arr_lock. */
3876static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3877{
3878 struct st_buffer *tb;
3879
3880 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3881 if (!tb) {
3882 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3883 return NULL;
3884 }
3885 tb->frp_segs = 0;
3886 tb->use_sg = max_sg;
3887 tb->dma = need_dma;
3888 tb->buffer_size = 0;
3889
3890 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3891 GFP_ATOMIC);
3892 if (!tb->reserved_pages) {
3893 kfree(tb);
3894 return NULL;
3895 }
3896
3897 return tb;
3898}
3899
3900
3901/* Try to allocate enough space in the tape buffer */
3902#define ST_MAX_ORDER 6
3903
3904static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3905{
3906 int segs, max_segs, b_size, order, got;
3907 gfp_t priority;
3908
3909 if (new_size <= STbuffer->buffer_size)
3910 return 1;
3911
3912 if (STbuffer->buffer_size <= PAGE_SIZE)
3913 normalize_buffer(STbuffer); /* Avoid extra segment */
3914
3915 max_segs = STbuffer->use_sg;
3916
3917 priority = GFP_KERNEL | __GFP_NOWARN;
3918 if (need_dma)
3919 priority |= GFP_DMA;
3920
3921 if (STbuffer->cleared)
3922 priority |= __GFP_ZERO;
3923
3924 if (STbuffer->frp_segs) {
3925 order = STbuffer->reserved_page_order;
3926 b_size = PAGE_SIZE << order;
3927 } else {
3928 for (b_size = PAGE_SIZE, order = 0;
3929 order < ST_MAX_ORDER &&
3930 max_segs * (PAGE_SIZE << order) < new_size;
3931 order++, b_size *= 2)
3932 ; /* empty */
3933 STbuffer->reserved_page_order = order;
3934 }
3935 if (max_segs * (PAGE_SIZE << order) < new_size) {
3936 if (order == ST_MAX_ORDER)
3937 return 0;
3938 normalize_buffer(STbuffer);
3939 return enlarge_buffer(STbuffer, new_size, need_dma);
3940 }
3941
3942 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3943 segs < max_segs && got < new_size;) {
3944 struct page *page;
3945
3946 page = alloc_pages(priority, order);
3947 if (!page) {
3948 DEB(STbuffer->buffer_size = got);
3949 normalize_buffer(STbuffer);
3950 return 0;
3951 }
3952
3953 STbuffer->frp_segs += 1;
3954 got += b_size;
3955 STbuffer->buffer_size = got;
3956 STbuffer->reserved_pages[segs] = page;
3957 segs++;
3958 }
3959 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3960
3961 return 1;
3962}
3963
3964
3965/* Make sure that no data from previous user is in the internal buffer */
3966static void clear_buffer(struct st_buffer * st_bp)
3967{
3968 int i;
3969
3970 for (i=0; i < st_bp->frp_segs; i++)
3971 memset(page_address(st_bp->reserved_pages[i]), 0,
3972 PAGE_SIZE << st_bp->reserved_page_order);
3973 st_bp->cleared = 1;
3974}
3975
3976
3977/* Release the extra buffer */
3978static void normalize_buffer(struct st_buffer * STbuffer)
3979{
3980 int i, order = STbuffer->reserved_page_order;
3981
3982 for (i = 0; i < STbuffer->frp_segs; i++) {
3983 __free_pages(STbuffer->reserved_pages[i], order);
3984 STbuffer->buffer_size -= (PAGE_SIZE << order);
3985 }
3986 STbuffer->frp_segs = 0;
3987 STbuffer->sg_segs = 0;
3988 STbuffer->reserved_page_order = 0;
3989 STbuffer->map_data.offset = 0;
3990}
3991
3992
3993/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3994 negative error code. */
3995static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3996{
3997 int i, cnt, res, offset;
3998 int length = PAGE_SIZE << st_bp->reserved_page_order;
3999
4000 for (i = 0, offset = st_bp->buffer_bytes;
4001 i < st_bp->frp_segs && offset >= length; i++)
4002 offset -= length;
4003 if (i == st_bp->frp_segs) { /* Should never happen */
4004 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4005 return (-EIO);
4006 }
4007 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4008 struct page *page = st_bp->reserved_pages[i];
4009 cnt = length - offset < do_count ? length - offset : do_count;
4010 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4011 if (res)
4012 return (-EFAULT);
4013 do_count -= cnt;
4014 st_bp->buffer_bytes += cnt;
4015 ubp += cnt;
4016 offset = 0;
4017 }
4018 if (do_count) /* Should never happen */
4019 return (-EIO);
4020
4021 return 0;
4022}
4023
4024
4025/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4026 negative error code. */
4027static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4028{
4029 int i, cnt, res, offset;
4030 int length = PAGE_SIZE << st_bp->reserved_page_order;
4031
4032 for (i = 0, offset = st_bp->read_pointer;
4033 i < st_bp->frp_segs && offset >= length; i++)
4034 offset -= length;
4035 if (i == st_bp->frp_segs) { /* Should never happen */
4036 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4037 return (-EIO);
4038 }
4039 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4040 struct page *page = st_bp->reserved_pages[i];
4041 cnt = length - offset < do_count ? length - offset : do_count;
4042 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4043 if (res)
4044 return (-EFAULT);
4045 do_count -= cnt;
4046 st_bp->buffer_bytes -= cnt;
4047 st_bp->read_pointer += cnt;
4048 ubp += cnt;
4049 offset = 0;
4050 }
4051 if (do_count) /* Should never happen */
4052 return (-EIO);
4053
4054 return 0;
4055}
4056
4057
4058/* Move data towards start of buffer */
4059static void move_buffer_data(struct st_buffer * st_bp, int offset)
4060{
4061 int src_seg, dst_seg, src_offset = 0, dst_offset;
4062 int count, total;
4063 int length = PAGE_SIZE << st_bp->reserved_page_order;
4064
4065 if (offset == 0)
4066 return;
4067
4068 total=st_bp->buffer_bytes - offset;
4069 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4070 src_offset = offset;
4071 if (src_offset < length)
4072 break;
4073 offset -= length;
4074 }
4075
4076 st_bp->buffer_bytes = st_bp->read_pointer = total;
4077 for (dst_seg=dst_offset=0; total > 0; ) {
4078 struct page *dpage = st_bp->reserved_pages[dst_seg];
4079 struct page *spage = st_bp->reserved_pages[src_seg];
4080
4081 count = min(length - dst_offset, length - src_offset);
4082 memmove(page_address(dpage) + dst_offset,
4083 page_address(spage) + src_offset, count);
4084 src_offset += count;
4085 if (src_offset >= length) {
4086 src_seg++;
4087 src_offset = 0;
4088 }
4089 dst_offset += count;
4090 if (dst_offset >= length) {
4091 dst_seg++;
4092 dst_offset = 0;
4093 }
4094 total -= count;
4095 }
4096}
4097
4098/* Validate the options from command line or module parameters */
4099static void validate_options(void)
4100{
4101 if (buffer_kbs > 0)
4102 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4103 if (max_sg_segs >= ST_FIRST_SG)
4104 st_max_sg_segs = max_sg_segs;
4105}
4106
4107#ifndef MODULE
4108/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4109 */
4110static int __init st_setup(char *str)
4111{
4112 int i, len, ints[5];
4113 char *stp;
4114
4115 stp = get_options(str, ARRAY_SIZE(ints), ints);
4116
4117 if (ints[0] > 0) {
4118 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4119 if (parms[i].val)
4120 *parms[i].val = ints[i + 1];
4121 } else {
4122 while (stp != NULL) {
4123 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4124 len = strlen(parms[i].name);
4125 if (!strncmp(stp, parms[i].name, len) &&
4126 (*(stp + len) == ':' || *(stp + len) == '=')) {
4127 if (parms[i].val)
4128 *parms[i].val =
4129 simple_strtoul(stp + len + 1, NULL, 0);
4130 else
4131 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4132 parms[i].name);
4133 break;
4134 }
4135 }
4136 if (i >= ARRAY_SIZE(parms))
4137 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4138 stp);
4139 stp = strchr(stp, ',');
4140 if (stp)
4141 stp++;
4142 }
4143 }
4144
4145 validate_options();
4146
4147 return 1;
4148}
4149
4150__setup("st=", st_setup);
4151
4152#endif
4153
4154static const struct file_operations st_fops =
4155{
4156 .owner = THIS_MODULE,
4157 .read = st_read,
4158 .write = st_write,
4159 .unlocked_ioctl = st_ioctl,
4160#ifdef CONFIG_COMPAT
4161 .compat_ioctl = st_compat_ioctl,
4162#endif
4163 .open = st_open,
4164 .flush = st_flush,
4165 .release = st_release,
4166 .llseek = noop_llseek,
4167};
4168
4169static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4170{
4171 int i, error;
4172 dev_t cdev_devno;
4173 struct cdev *cdev;
4174 struct device *dev;
4175 struct st_modedef *STm = &(tape->modes[mode]);
4176 char name[10];
4177 int dev_num = tape->index;
4178
4179 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4180
4181 cdev = cdev_alloc();
4182 if (!cdev) {
4183 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4184 error = -ENOMEM;
4185 goto out;
4186 }
4187 cdev->owner = THIS_MODULE;
4188 cdev->ops = &st_fops;
4189 STm->cdevs[rew] = cdev;
4190
4191 error = cdev_add(cdev, cdev_devno, 1);
4192 if (error) {
4193 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4194 rew ? "non" : "auto", mode);
4195 pr_err("st%d: Device not attached.\n", dev_num);
4196 goto out_free;
4197 }
4198
4199 i = mode << (4 - ST_NBR_MODE_BITS);
4200 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4201 tape->disk->disk_name, st_formats[i]);
4202
4203 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4204 cdev_devno, &tape->modes[mode], "%s", name);
4205 if (IS_ERR(dev)) {
4206 pr_err("st%d: device_create failed\n", dev_num);
4207 error = PTR_ERR(dev);
4208 goto out_free;
4209 }
4210
4211 STm->devs[rew] = dev;
4212
4213 return 0;
4214out_free:
4215 cdev_del(STm->cdevs[rew]);
4216out:
4217 STm->cdevs[rew] = NULL;
4218 STm->devs[rew] = NULL;
4219 return error;
4220}
4221
4222static int create_cdevs(struct scsi_tape *tape)
4223{
4224 int mode, error;
4225 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4226 error = create_one_cdev(tape, mode, 0);
4227 if (error)
4228 return error;
4229 error = create_one_cdev(tape, mode, 1);
4230 if (error)
4231 return error;
4232 }
4233
4234 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4235 &tape->modes[0].devs[0]->kobj, "tape");
4236}
4237
4238static void remove_cdevs(struct scsi_tape *tape)
4239{
4240 int mode, rew;
4241 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4242 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4243 struct st_modedef *STm = &(tape->modes[mode]);
4244 for (rew = 0; rew < 2; rew++) {
4245 if (STm->cdevs[rew])
4246 cdev_del(STm->cdevs[rew]);
4247 if (STm->devs[rew])
4248 device_unregister(STm->devs[rew]);
4249 }
4250 }
4251}
4252
4253static int st_probe(struct device *dev)
4254{
4255 struct scsi_device *SDp = to_scsi_device(dev);
4256 struct gendisk *disk = NULL;
4257 struct scsi_tape *tpnt = NULL;
4258 struct st_modedef *STm;
4259 struct st_partstat *STps;
4260 struct st_buffer *buffer;
4261 int i, error;
4262 char *stp;
4263
4264 if (SDp->type != TYPE_TAPE)
4265 return -ENODEV;
4266 if ((stp = st_incompatible(SDp))) {
4267 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4268 sdev_printk(KERN_INFO, SDp,
4269 "st: The suggested driver is %s.\n", stp);
4270 return -ENODEV;
4271 }
4272
4273 scsi_autopm_get_device(SDp);
4274 i = queue_max_segments(SDp->request_queue);
4275 if (st_max_sg_segs < i)
4276 i = st_max_sg_segs;
4277 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4278 if (buffer == NULL) {
4279 sdev_printk(KERN_ERR, SDp,
4280 "st: Can't allocate new tape buffer. "
4281 "Device not attached.\n");
4282 goto out;
4283 }
4284
4285 disk = alloc_disk(1);
4286 if (!disk) {
4287 sdev_printk(KERN_ERR, SDp,
4288 "st: out of memory. Device not attached.\n");
4289 goto out_buffer_free;
4290 }
4291
4292 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4293 if (tpnt == NULL) {
4294 sdev_printk(KERN_ERR, SDp,
4295 "st: Can't allocate device descriptor.\n");
4296 goto out_put_disk;
4297 }
4298 kref_init(&tpnt->kref);
4299 tpnt->disk = disk;
4300 disk->private_data = &tpnt->driver;
4301 disk->queue = SDp->request_queue;
4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4303 * take queue reference that release_disk() expects. */
4304 if (!blk_get_queue(disk->queue))
4305 goto out_put_disk;
4306 tpnt->driver = &st_template;
4307
4308 tpnt->device = SDp;
4309 if (SDp->scsi_level <= 2)
4310 tpnt->tape_type = MT_ISSCSI1;
4311 else
4312 tpnt->tape_type = MT_ISSCSI2;
4313
4314 tpnt->buffer = buffer;
4315 tpnt->buffer->last_SRpnt = NULL;
4316
4317 tpnt->inited = 0;
4318 tpnt->dirty = 0;
4319 tpnt->in_use = 0;
4320 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4321 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4322 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4323 tpnt->density = 0;
4324 tpnt->do_auto_lock = ST_AUTO_LOCK;
4325 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4326 tpnt->can_partitions = 0;
4327 tpnt->two_fm = ST_TWO_FM;
4328 tpnt->fast_mteom = ST_FAST_MTEOM;
4329 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4330 tpnt->sili = ST_SILI;
4331 tpnt->immediate = ST_NOWAIT;
4332 tpnt->immediate_filemark = 0;
4333 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4334 tpnt->partition = 0;
4335 tpnt->new_partition = 0;
4336 tpnt->nbr_partitions = 0;
4337 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4338 tpnt->long_timeout = ST_LONG_TIMEOUT;
4339 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4340
4341 for (i = 0; i < ST_NBR_MODES; i++) {
4342 STm = &(tpnt->modes[i]);
4343 STm->defined = 0;
4344 STm->sysv = ST_SYSV;
4345 STm->defaults_for_writes = 0;
4346 STm->do_async_writes = ST_ASYNC_WRITES;
4347 STm->do_buffer_writes = ST_BUFFER_WRITES;
4348 STm->do_read_ahead = ST_READ_AHEAD;
4349 STm->default_compression = ST_DONT_TOUCH;
4350 STm->default_blksize = (-1); /* No forced size */
4351 STm->default_density = (-1); /* No forced density */
4352 STm->tape = tpnt;
4353 }
4354
4355 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4356 STps = &(tpnt->ps[i]);
4357 STps->rw = ST_IDLE;
4358 STps->eof = ST_NOEOF;
4359 STps->at_sm = 0;
4360 STps->last_block_valid = 0;
4361 STps->drv_block = (-1);
4362 STps->drv_file = (-1);
4363 }
4364
4365 tpnt->current_mode = 0;
4366 tpnt->modes[0].defined = 1;
4367
4368 tpnt->density_changed = tpnt->compression_changed =
4369 tpnt->blksize_changed = 0;
4370 mutex_init(&tpnt->lock);
4371
4372 idr_preload(GFP_KERNEL);
4373 spin_lock(&st_index_lock);
4374 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4375 spin_unlock(&st_index_lock);
4376 idr_preload_end();
4377 if (error < 0) {
4378 pr_warn("st: idr allocation failed: %d\n", error);
4379 goto out_put_queue;
4380 }
4381 tpnt->index = error;
4382 sprintf(disk->disk_name, "st%d", tpnt->index);
4383 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4384 if (tpnt->stats == NULL) {
4385 sdev_printk(KERN_ERR, SDp,
4386 "st: Can't allocate statistics.\n");
4387 goto out_idr_remove;
4388 }
4389
4390 dev_set_drvdata(dev, tpnt);
4391
4392
4393 error = create_cdevs(tpnt);
4394 if (error)
4395 goto out_remove_devs;
4396 scsi_autopm_put_device(SDp);
4397
4398 sdev_printk(KERN_NOTICE, SDp,
4399 "Attached scsi tape %s\n", tape_name(tpnt));
4400 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4401 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4402 queue_dma_alignment(SDp->request_queue) + 1);
4403
4404 return 0;
4405
4406out_remove_devs:
4407 remove_cdevs(tpnt);
4408 kfree(tpnt->stats);
4409out_idr_remove:
4410 spin_lock(&st_index_lock);
4411 idr_remove(&st_index_idr, tpnt->index);
4412 spin_unlock(&st_index_lock);
4413out_put_queue:
4414 blk_put_queue(disk->queue);
4415out_put_disk:
4416 put_disk(disk);
4417 kfree(tpnt);
4418out_buffer_free:
4419 kfree(buffer);
4420out:
4421 scsi_autopm_put_device(SDp);
4422 return -ENODEV;
4423};
4424
4425
4426static int st_remove(struct device *dev)
4427{
4428 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4429 int index = tpnt->index;
4430
4431 scsi_autopm_get_device(to_scsi_device(dev));
4432 remove_cdevs(tpnt);
4433
4434 mutex_lock(&st_ref_mutex);
4435 kref_put(&tpnt->kref, scsi_tape_release);
4436 mutex_unlock(&st_ref_mutex);
4437 spin_lock(&st_index_lock);
4438 idr_remove(&st_index_idr, index);
4439 spin_unlock(&st_index_lock);
4440 return 0;
4441}
4442
4443/**
4444 * scsi_tape_release - Called to free the Scsi_Tape structure
4445 * @kref: pointer to embedded kref
4446 *
4447 * st_ref_mutex must be held entering this routine. Because it is
4448 * called on last put, you should always use the scsi_tape_get()
4449 * scsi_tape_put() helpers which manipulate the semaphore directly
4450 * and never do a direct kref_put().
4451 **/
4452static void scsi_tape_release(struct kref *kref)
4453{
4454 struct scsi_tape *tpnt = to_scsi_tape(kref);
4455 struct gendisk *disk = tpnt->disk;
4456
4457 tpnt->device = NULL;
4458
4459 if (tpnt->buffer) {
4460 normalize_buffer(tpnt->buffer);
4461 kfree(tpnt->buffer->reserved_pages);
4462 kfree(tpnt->buffer);
4463 }
4464
4465 disk->private_data = NULL;
4466 put_disk(disk);
4467 kfree(tpnt->stats);
4468 kfree(tpnt);
4469 return;
4470}
4471
4472static struct class st_sysfs_class = {
4473 .name = "scsi_tape",
4474 .dev_groups = st_dev_groups,
4475};
4476
4477static int __init init_st(void)
4478{
4479 int err;
4480
4481 validate_options();
4482
4483 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4484 verstr, st_fixed_buffer_size, st_max_sg_segs);
4485
4486 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4487 if (debugging) {
4488 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4489 debugging);
4490 }
4491
4492 err = class_register(&st_sysfs_class);
4493 if (err) {
4494 pr_err("Unable register sysfs class for SCSI tapes\n");
4495 return err;
4496 }
4497
4498 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4499 ST_MAX_TAPE_ENTRIES, "st");
4500 if (err) {
4501 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4502 SCSI_TAPE_MAJOR);
4503 goto err_class;
4504 }
4505
4506 err = scsi_register_driver(&st_template.gendrv);
4507 if (err)
4508 goto err_chrdev;
4509
4510 return 0;
4511
4512err_chrdev:
4513 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4514 ST_MAX_TAPE_ENTRIES);
4515err_class:
4516 class_unregister(&st_sysfs_class);
4517 return err;
4518}
4519
4520static void __exit exit_st(void)
4521{
4522 scsi_unregister_driver(&st_template.gendrv);
4523 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4524 ST_MAX_TAPE_ENTRIES);
4525 class_unregister(&st_sysfs_class);
4526 idr_destroy(&st_index_idr);
4527 printk(KERN_INFO "st: Unloaded.\n");
4528}
4529
4530module_init(init_st);
4531module_exit(exit_st);
4532
4533
4534/* The sysfs driver interface. Read-only at the moment */
4535static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4536{
4537 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4538}
4539static DRIVER_ATTR_RO(try_direct_io);
4540
4541static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4542{
4543 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4544}
4545static DRIVER_ATTR_RO(fixed_buffer_size);
4546
4547static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4548{
4549 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4550}
4551static DRIVER_ATTR_RO(max_sg_segs);
4552
4553static ssize_t version_show(struct device_driver *ddd, char *buf)
4554{
4555 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4556}
4557static DRIVER_ATTR_RO(version);
4558
4559#if DEBUG
4560static ssize_t debug_flag_store(struct device_driver *ddp,
4561 const char *buf, size_t count)
4562{
4563/* We only care what the first byte of the data is the rest is unused.
4564 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4565 * other values have -EINVAL returned if they are passed in.
4566 */
4567 if (count > 0) {
4568 if (buf[0] == '0') {
4569 debugging = NO_DEBUG;
4570 return count;
4571 } else if (buf[0] == '1') {
4572 debugging = 1;
4573 return count;
4574 }
4575 }
4576 return -EINVAL;
4577}
4578
4579static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4580{
4581 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4582}
4583static DRIVER_ATTR_RW(debug_flag);
4584#endif
4585
4586static struct attribute *st_drv_attrs[] = {
4587 &driver_attr_try_direct_io.attr,
4588 &driver_attr_fixed_buffer_size.attr,
4589 &driver_attr_max_sg_segs.attr,
4590 &driver_attr_version.attr,
4591#if DEBUG
4592 &driver_attr_debug_flag.attr,
4593#endif
4594 NULL,
4595};
4596ATTRIBUTE_GROUPS(st_drv);
4597
4598/* The sysfs simple class interface */
4599static ssize_t
4600defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4601{
4602 struct st_modedef *STm = dev_get_drvdata(dev);
4603 ssize_t l = 0;
4604
4605 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4606 return l;
4607}
4608static DEVICE_ATTR_RO(defined);
4609
4610static ssize_t
4611default_blksize_show(struct device *dev, struct device_attribute *attr,
4612 char *buf)
4613{
4614 struct st_modedef *STm = dev_get_drvdata(dev);
4615 ssize_t l = 0;
4616
4617 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4618 return l;
4619}
4620static DEVICE_ATTR_RO(default_blksize);
4621
4622static ssize_t
4623default_density_show(struct device *dev, struct device_attribute *attr,
4624 char *buf)
4625{
4626 struct st_modedef *STm = dev_get_drvdata(dev);
4627 ssize_t l = 0;
4628 char *fmt;
4629
4630 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4631 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4632 return l;
4633}
4634static DEVICE_ATTR_RO(default_density);
4635
4636static ssize_t
4637default_compression_show(struct device *dev, struct device_attribute *attr,
4638 char *buf)
4639{
4640 struct st_modedef *STm = dev_get_drvdata(dev);
4641 ssize_t l = 0;
4642
4643 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4644 return l;
4645}
4646static DEVICE_ATTR_RO(default_compression);
4647
4648static ssize_t
4649options_show(struct device *dev, struct device_attribute *attr, char *buf)
4650{
4651 struct st_modedef *STm = dev_get_drvdata(dev);
4652 struct scsi_tape *STp = STm->tape;
4653 int options;
4654 ssize_t l = 0;
4655
4656 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4657 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4658 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4659 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4660 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4661 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4662 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4663 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4664 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4665 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4666 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4667 options |= STm->sysv ? MT_ST_SYSV : 0;
4668 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4669 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4670 options |= STp->sili ? MT_ST_SILI : 0;
4671
4672 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4673 return l;
4674}
4675static DEVICE_ATTR_RO(options);
4676
4677/* Support for tape stats */
4678
4679/**
4680 * read_cnt_show - return read count - count of reads made from tape drive
4681 * @dev: struct device
4682 * @attr: attribute structure
4683 * @buf: buffer to return formatted data in
4684 */
4685static ssize_t read_cnt_show(struct device *dev,
4686 struct device_attribute *attr, char *buf)
4687{
4688 struct st_modedef *STm = dev_get_drvdata(dev);
4689
4690 return sprintf(buf, "%lld",
4691 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4692}
4693static DEVICE_ATTR_RO(read_cnt);
4694
4695/**
4696 * read_byte_cnt_show - return read byte count - tape drives
4697 * may use blocks less than 512 bytes this gives the raw byte count of
4698 * of data read from the tape drive.
4699 * @dev: struct device
4700 * @attr: attribute structure
4701 * @buf: buffer to return formatted data in
4702 */
4703static ssize_t read_byte_cnt_show(struct device *dev,
4704 struct device_attribute *attr, char *buf)
4705{
4706 struct st_modedef *STm = dev_get_drvdata(dev);
4707
4708 return sprintf(buf, "%lld",
4709 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4710}
4711static DEVICE_ATTR_RO(read_byte_cnt);
4712
4713/**
4714 * read_us_show - return read us - overall time spent waiting on reads in ns.
4715 * @dev: struct device
4716 * @attr: attribute structure
4717 * @buf: buffer to return formatted data in
4718 */
4719static ssize_t read_ns_show(struct device *dev,
4720 struct device_attribute *attr, char *buf)
4721{
4722 struct st_modedef *STm = dev_get_drvdata(dev);
4723
4724 return sprintf(buf, "%lld",
4725 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4726}
4727static DEVICE_ATTR_RO(read_ns);
4728
4729/**
4730 * write_cnt_show - write count - number of user calls
4731 * to write(2) that have written data to tape.
4732 * @dev: struct device
4733 * @attr: attribute structure
4734 * @buf: buffer to return formatted data in
4735 */
4736static ssize_t write_cnt_show(struct device *dev,
4737 struct device_attribute *attr, char *buf)
4738{
4739 struct st_modedef *STm = dev_get_drvdata(dev);
4740
4741 return sprintf(buf, "%lld",
4742 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4743}
4744static DEVICE_ATTR_RO(write_cnt);
4745
4746/**
4747 * write_byte_cnt_show - write byte count - raw count of
4748 * bytes written to tape.
4749 * @dev: struct device
4750 * @attr: attribute structure
4751 * @buf: buffer to return formatted data in
4752 */
4753static ssize_t write_byte_cnt_show(struct device *dev,
4754 struct device_attribute *attr, char *buf)
4755{
4756 struct st_modedef *STm = dev_get_drvdata(dev);
4757
4758 return sprintf(buf, "%lld",
4759 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4760}
4761static DEVICE_ATTR_RO(write_byte_cnt);
4762
4763/**
4764 * write_ns_show - write ns - number of nanoseconds waiting on write
4765 * requests to complete.
4766 * @dev: struct device
4767 * @attr: attribute structure
4768 * @buf: buffer to return formatted data in
4769 */
4770static ssize_t write_ns_show(struct device *dev,
4771 struct device_attribute *attr, char *buf)
4772{
4773 struct st_modedef *STm = dev_get_drvdata(dev);
4774
4775 return sprintf(buf, "%lld",
4776 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4777}
4778static DEVICE_ATTR_RO(write_ns);
4779
4780/**
4781 * in_flight_show - number of I/Os currently in flight -
4782 * in most cases this will be either 0 or 1. It may be higher if someone
4783 * has also issued other SCSI commands such as via an ioctl.
4784 * @dev: struct device
4785 * @attr: attribute structure
4786 * @buf: buffer to return formatted data in
4787 */
4788static ssize_t in_flight_show(struct device *dev,
4789 struct device_attribute *attr, char *buf)
4790{
4791 struct st_modedef *STm = dev_get_drvdata(dev);
4792
4793 return sprintf(buf, "%lld",
4794 (long long)atomic64_read(&STm->tape->stats->in_flight));
4795}
4796static DEVICE_ATTR_RO(in_flight);
4797
4798/**
4799 * io_ns_show - io wait ns - this is the number of ns spent
4800 * waiting on all I/O to complete. This includes tape movement commands
4801 * such as rewinding, seeking to end of file or tape, it also includes
4802 * read and write. To determine the time spent on tape movement
4803 * subtract the read and write ns from this value.
4804 * @dev: struct device
4805 * @attr: attribute structure
4806 * @buf: buffer to return formatted data in
4807 */
4808static ssize_t io_ns_show(struct device *dev,
4809 struct device_attribute *attr, char *buf)
4810{
4811 struct st_modedef *STm = dev_get_drvdata(dev);
4812
4813 return sprintf(buf, "%lld",
4814 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4815}
4816static DEVICE_ATTR_RO(io_ns);
4817
4818/**
4819 * other_cnt_show - other io count - this is the number of
4820 * I/O requests other than read and write requests.
4821 * Typically these are tape movement requests but will include driver
4822 * tape movement. This includes only requests issued by the st driver.
4823 * @dev: struct device
4824 * @attr: attribute structure
4825 * @buf: buffer to return formatted data in
4826 */
4827static ssize_t other_cnt_show(struct device *dev,
4828 struct device_attribute *attr, char *buf)
4829{
4830 struct st_modedef *STm = dev_get_drvdata(dev);
4831
4832 return sprintf(buf, "%lld",
4833 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4834}
4835static DEVICE_ATTR_RO(other_cnt);
4836
4837/**
4838 * resid_cnt_show - A count of the number of times we get a residual
4839 * count - this should indicate someone issuing reads larger than the
4840 * block size on tape.
4841 * @dev: struct device
4842 * @attr: attribute structure
4843 * @buf: buffer to return formatted data in
4844 */
4845static ssize_t resid_cnt_show(struct device *dev,
4846 struct device_attribute *attr, char *buf)
4847{
4848 struct st_modedef *STm = dev_get_drvdata(dev);
4849
4850 return sprintf(buf, "%lld",
4851 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4852}
4853static DEVICE_ATTR_RO(resid_cnt);
4854
4855static struct attribute *st_dev_attrs[] = {
4856 &dev_attr_defined.attr,
4857 &dev_attr_default_blksize.attr,
4858 &dev_attr_default_density.attr,
4859 &dev_attr_default_compression.attr,
4860 &dev_attr_options.attr,
4861 NULL,
4862};
4863
4864static struct attribute *st_stats_attrs[] = {
4865 &dev_attr_read_cnt.attr,
4866 &dev_attr_read_byte_cnt.attr,
4867 &dev_attr_read_ns.attr,
4868 &dev_attr_write_cnt.attr,
4869 &dev_attr_write_byte_cnt.attr,
4870 &dev_attr_write_ns.attr,
4871 &dev_attr_in_flight.attr,
4872 &dev_attr_io_ns.attr,
4873 &dev_attr_other_cnt.attr,
4874 &dev_attr_resid_cnt.attr,
4875 NULL,
4876};
4877
4878static struct attribute_group stats_group = {
4879 .name = "stats",
4880 .attrs = st_stats_attrs,
4881};
4882
4883static struct attribute_group st_group = {
4884 .attrs = st_dev_attrs,
4885};
4886
4887static const struct attribute_group *st_dev_groups[] = {
4888 &st_group,
4889 &stats_group,
4890 NULL,
4891};
4892
4893/* The following functions may be useful for a larger audience. */
4894static int sgl_map_user_pages(struct st_buffer *STbp,
4895 const unsigned int max_pages, unsigned long uaddr,
4896 size_t count, int rw)
4897{
4898 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4899 unsigned long start = uaddr >> PAGE_SHIFT;
4900 const int nr_pages = end - start;
4901 int res, i, j;
4902 struct page **pages;
4903 struct rq_map_data *mdata = &STbp->map_data;
4904
4905 /* User attempted Overflow! */
4906 if ((uaddr + count) < uaddr)
4907 return -EINVAL;
4908
4909 /* Too big */
4910 if (nr_pages > max_pages)
4911 return -ENOMEM;
4912
4913 /* Hmm? */
4914 if (count == 0)
4915 return 0;
4916
4917 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4918 return -ENOMEM;
4919
4920 /* Try to fault in all of the necessary pages */
4921 /* rw==READ means read from drive, write into memory area */
4922 res = get_user_pages_unlocked(
4923 uaddr,
4924 nr_pages,
4925 pages,
4926 rw == READ ? FOLL_WRITE : 0); /* don't force */
4927
4928 /* Errors and no page mapped should return here */
4929 if (res < nr_pages)
4930 goto out_unmap;
4931
4932 for (i=0; i < nr_pages; i++) {
4933 /* FIXME: flush superflous for rw==READ,
4934 * probably wrong function for rw==WRITE
4935 */
4936 flush_dcache_page(pages[i]);
4937 }
4938
4939 mdata->offset = uaddr & ~PAGE_MASK;
4940 STbp->mapped_pages = pages;
4941
4942 return nr_pages;
4943 out_unmap:
4944 if (res > 0) {
4945 for (j=0; j < res; j++)
4946 put_page(pages[j]);
4947 res = 0;
4948 }
4949 kfree(pages);
4950 return res;
4951}
4952
4953
4954/* And unmap them... */
4955static int sgl_unmap_user_pages(struct st_buffer *STbp,
4956 const unsigned int nr_pages, int dirtied)
4957{
4958 int i;
4959
4960 for (i=0; i < nr_pages; i++) {
4961 struct page *page = STbp->mapped_pages[i];
4962
4963 if (dirtied)
4964 SetPageDirty(page);
4965 /* FIXME: cache flush missing for rw==READ
4966 * FIXME: call the correct reference counting function
4967 */
4968 put_page(page);
4969 }
4970 kfree(STbp->mapped_pages);
4971 STbp->mapped_pages = NULL;
4972
4973 return 0;
4974}
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}