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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/delay.h>
41#include <linux/mutex.h>
42
43#include <asm/uaccess.h>
44#include <asm/dma.h>
45
46#include <scsi/scsi.h>
47#include <scsi/scsi_dbg.h>
48#include <scsi/scsi_device.h>
49#include <scsi/scsi_driver.h>
50#include <scsi/scsi_eh.h>
51#include <scsi/scsi_host.h>
52#include <scsi/scsi_ioctl.h>
53#include <scsi/sg.h>
54
55
56/* The driver prints some debugging information on the console if DEBUG
57 is defined and non-zero. */
58#define DEBUG 0
59
60#if DEBUG
61/* The message level for the debug messages is currently set to KERN_NOTICE
62 so that people can easily see the messages. Later when the debugging messages
63 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
64#define ST_DEB_MSG KERN_NOTICE
65#define DEB(a) a
66#define DEBC(a) if (debugging) { a ; }
67#else
68#define DEB(a)
69#define DEBC(a)
70#endif
71
72#define ST_KILOBYTE 1024
73
74#include "st_options.h"
75#include "st.h"
76
77static DEFINE_MUTEX(st_mutex);
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 int st_dev_max;
85static int st_nr_dev;
86
87static struct class *st_sysfs_class;
88
89MODULE_AUTHOR("Kai Makisara");
90MODULE_DESCRIPTION("SCSI tape (st) driver");
91MODULE_LICENSE("GPL");
92MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
94
95/* Set 'perm' (4th argument) to 0 to disable module_param's definition
96 * of sysfs parameters (which module_param doesn't yet support).
97 * Sysfs parameters defined explicitly later.
98 */
99module_param_named(buffer_kbs, buffer_kbs, int, 0);
100MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
101module_param_named(max_sg_segs, max_sg_segs, int, 0);
102MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
103module_param_named(try_direct_io, try_direct_io, int, 0);
104MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
105
106/* Extra parameters for testing */
107module_param_named(try_rdio, try_rdio, int, 0);
108MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
109module_param_named(try_wdio, try_wdio, int, 0);
110MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
111
112#ifndef MODULE
113static int write_threshold_kbs; /* retained for compatibility */
114static struct st_dev_parm {
115 char *name;
116 int *val;
117} parms[] __initdata = {
118 {
119 "buffer_kbs", &buffer_kbs
120 },
121 { /* Retained for compatibility with 2.4 */
122 "write_threshold_kbs", &write_threshold_kbs
123 },
124 {
125 "max_sg_segs", NULL
126 },
127 {
128 "try_direct_io", &try_direct_io
129 }
130};
131#endif
132
133/* Restrict the number of modes so that names for all are assigned */
134#if ST_NBR_MODES > 16
135#error "Maximum number of modes is 16"
136#endif
137/* Bit reversed order to get same names for same minors with all
138 mode counts */
139static const char *st_formats[] = {
140 "", "r", "k", "s", "l", "t", "o", "u",
141 "m", "v", "p", "x", "a", "y", "q", "z"};
142
143/* The default definitions have been moved to st_options.h */
144
145#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
146
147/* The buffer size should fit into the 24 bits for length in the
148 6-byte SCSI read and write commands. */
149#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
150#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
151#endif
152
153static int debugging = DEBUG;
154
155#define MAX_RETRIES 0
156#define MAX_WRITE_RETRIES 0
157#define MAX_READY_RETRIES 0
158#define NO_TAPE NOT_READY
159
160#define ST_TIMEOUT (900 * HZ)
161#define ST_LONG_TIMEOUT (14000 * HZ)
162
163/* Remove mode bits and auto-rewind bit (7) */
164#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
165 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
166#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
167
168/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
169#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
170 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
171
172/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
173 24 bits) */
174#define SET_DENS_AND_BLK 0x10001
175
176static DEFINE_RWLOCK(st_dev_arr_lock);
177
178static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
179static int st_max_sg_segs = ST_MAX_SG;
180
181static struct scsi_tape **scsi_tapes = NULL;
182
183static int modes_defined;
184
185static int enlarge_buffer(struct st_buffer *, int, int);
186static void clear_buffer(struct st_buffer *);
187static void normalize_buffer(struct st_buffer *);
188static int append_to_buffer(const char __user *, struct st_buffer *, int);
189static int from_buffer(struct st_buffer *, char __user *, int);
190static void move_buffer_data(struct st_buffer *, int);
191
192static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
193 unsigned long, size_t, int);
194static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
195
196static int st_probe(struct device *);
197static int st_remove(struct device *);
198
199static int do_create_sysfs_files(void);
200static void do_remove_sysfs_files(void);
201static int do_create_class_files(struct scsi_tape *, int, int);
202
203static struct scsi_driver st_template = {
204 .owner = THIS_MODULE,
205 .gendrv = {
206 .name = "st",
207 .probe = st_probe,
208 .remove = st_remove,
209 },
210};
211
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);
224
225
226#include "osst_detect.h"
227#ifndef SIGS_FROM_OSST
228#define SIGS_FROM_OSST \
229 {"OnStream", "SC-", "", "osst"}, \
230 {"OnStream", "DI-", "", "osst"}, \
231 {"OnStream", "DP-", "", "osst"}, \
232 {"OnStream", "USB", "", "osst"}, \
233 {"OnStream", "FW-", "", "osst"}
234#endif
235
236static struct scsi_tape *scsi_tape_get(int dev)
237{
238 struct scsi_tape *STp = NULL;
239
240 mutex_lock(&st_ref_mutex);
241 write_lock(&st_dev_arr_lock);
242
243 if (dev < st_dev_max && scsi_tapes != NULL)
244 STp = scsi_tapes[dev];
245 if (!STp) goto out;
246
247 kref_get(&STp->kref);
248
249 if (!STp->device)
250 goto out_put;
251
252 if (scsi_device_get(STp->device))
253 goto out_put;
254
255 goto out;
256
257out_put:
258 kref_put(&STp->kref, scsi_tape_release);
259 STp = NULL;
260out:
261 write_unlock(&st_dev_arr_lock);
262 mutex_unlock(&st_ref_mutex);
263 return STp;
264}
265
266static void scsi_tape_put(struct scsi_tape *STp)
267{
268 struct scsi_device *sdev = STp->device;
269
270 mutex_lock(&st_ref_mutex);
271 kref_put(&STp->kref, scsi_tape_release);
272 scsi_device_put(sdev);
273 mutex_unlock(&st_ref_mutex);
274}
275
276struct st_reject_data {
277 char *vendor;
278 char *model;
279 char *rev;
280 char *driver_hint; /* Name of the correct driver, NULL if unknown */
281};
282
283static struct st_reject_data reject_list[] = {
284 /* {"XXX", "Yy-", "", NULL}, example */
285 SIGS_FROM_OSST,
286 {NULL, }};
287
288/* If the device signature is on the list of incompatible drives, the
289 function returns a pointer to the name of the correct driver (if known) */
290static char * st_incompatible(struct scsi_device* SDp)
291{
292 struct st_reject_data *rp;
293
294 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
295 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
296 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
297 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
298 if (rp->driver_hint)
299 return rp->driver_hint;
300 else
301 return "unknown";
302 }
303 return NULL;
304}
305
306
307static inline char *tape_name(struct scsi_tape *tape)
308{
309 return tape->disk->disk_name;
310}
311
312
313static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
314{
315 const u8 *ucp;
316 const u8 *sense = SRpnt->sense;
317
318 s->have_sense = scsi_normalize_sense(SRpnt->sense,
319 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
320 s->flags = 0;
321
322 if (s->have_sense) {
323 s->deferred = 0;
324 s->remainder_valid =
325 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
326 switch (sense[0] & 0x7f) {
327 case 0x71:
328 s->deferred = 1;
329 case 0x70:
330 s->fixed_format = 1;
331 s->flags = sense[2] & 0xe0;
332 break;
333 case 0x73:
334 s->deferred = 1;
335 case 0x72:
336 s->fixed_format = 0;
337 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
338 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
339 break;
340 }
341 }
342}
343
344
345/* Convert the result to success code */
346static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
347{
348 int result = SRpnt->result;
349 u8 scode;
350 DEB(const char *stp;)
351 char *name = tape_name(STp);
352 struct st_cmdstatus *cmdstatp;
353
354 if (!result)
355 return 0;
356
357 cmdstatp = &STp->buffer->cmdstat;
358 st_analyze_sense(SRpnt, cmdstatp);
359
360 if (cmdstatp->have_sense)
361 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
362 else
363 scode = 0;
364
365 DEB(
366 if (debugging) {
367 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
368 name, result,
369 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
370 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
371 if (cmdstatp->have_sense)
372 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
373 } ) /* end DEB */
374 if (!debugging) { /* Abnormal conditions for tape */
375 if (!cmdstatp->have_sense)
376 printk(KERN_WARNING
377 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
378 name, result, driver_byte(result),
379 host_byte(result));
380 else if (cmdstatp->have_sense &&
381 scode != NO_SENSE &&
382 scode != RECOVERED_ERROR &&
383 /* scode != UNIT_ATTENTION && */
384 scode != BLANK_CHECK &&
385 scode != VOLUME_OVERFLOW &&
386 SRpnt->cmd[0] != MODE_SENSE &&
387 SRpnt->cmd[0] != TEST_UNIT_READY) {
388
389 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
390 }
391 }
392
393 if (cmdstatp->fixed_format &&
394 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
395 if (STp->cln_sense_value)
396 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
397 STp->cln_sense_mask) == STp->cln_sense_value);
398 else
399 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
400 STp->cln_sense_mask) != 0);
401 }
402 if (cmdstatp->have_sense &&
403 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
404 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
405
406 STp->pos_unknown |= STp->device->was_reset;
407
408 if (cmdstatp->have_sense &&
409 scode == RECOVERED_ERROR
410#if ST_RECOVERED_WRITE_FATAL
411 && SRpnt->cmd[0] != WRITE_6
412 && SRpnt->cmd[0] != WRITE_FILEMARKS
413#endif
414 ) {
415 STp->recover_count++;
416 STp->recover_reg++;
417
418 DEB(
419 if (debugging) {
420 if (SRpnt->cmd[0] == READ_6)
421 stp = "read";
422 else if (SRpnt->cmd[0] == WRITE_6)
423 stp = "write";
424 else
425 stp = "ioctl";
426 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
427 STp->recover_count);
428 } ) /* end DEB */
429
430 if (cmdstatp->flags == 0)
431 return 0;
432 }
433 return (-EIO);
434}
435
436static struct st_request *st_allocate_request(struct scsi_tape *stp)
437{
438 struct st_request *streq;
439
440 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
441 if (streq)
442 streq->stp = stp;
443 else {
444 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
445 tape_name(stp)););
446 if (signal_pending(current))
447 stp->buffer->syscall_result = -EINTR;
448 else
449 stp->buffer->syscall_result = -EBUSY;
450 }
451
452 return streq;
453}
454
455static void st_release_request(struct st_request *streq)
456{
457 kfree(streq);
458}
459
460static void st_scsi_execute_end(struct request *req, int uptodate)
461{
462 struct st_request *SRpnt = req->end_io_data;
463 struct scsi_tape *STp = SRpnt->stp;
464 struct bio *tmp;
465
466 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
467 STp->buffer->cmdstat.residual = req->resid_len;
468
469 tmp = SRpnt->bio;
470 if (SRpnt->waiting)
471 complete(SRpnt->waiting);
472
473 blk_rq_unmap_user(tmp);
474 __blk_put_request(req->q, req);
475}
476
477static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
478 int data_direction, void *buffer, unsigned bufflen,
479 int timeout, int retries)
480{
481 struct request *req;
482 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
483 int err = 0;
484 int write = (data_direction == DMA_TO_DEVICE);
485
486 req = blk_get_request(SRpnt->stp->device->request_queue, write,
487 GFP_KERNEL);
488 if (!req)
489 return DRIVER_ERROR << 24;
490
491 req->cmd_type = REQ_TYPE_BLOCK_PC;
492 req->cmd_flags |= REQ_QUIET;
493
494 mdata->null_mapped = 1;
495
496 if (bufflen) {
497 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
498 GFP_KERNEL);
499 if (err) {
500 blk_put_request(req);
501 return DRIVER_ERROR << 24;
502 }
503 }
504
505 SRpnt->bio = req->bio;
506 req->cmd_len = COMMAND_SIZE(cmd[0]);
507 memset(req->cmd, 0, BLK_MAX_CDB);
508 memcpy(req->cmd, cmd, req->cmd_len);
509 req->sense = SRpnt->sense;
510 req->sense_len = 0;
511 req->timeout = timeout;
512 req->retries = retries;
513 req->end_io_data = SRpnt;
514
515 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
516 return 0;
517}
518
519/* Do the scsi command. Waits until command performed if do_wait is true.
520 Otherwise write_behind_check() is used to check that the command
521 has finished. */
522static struct st_request *
523st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
524 int bytes, int direction, int timeout, int retries, int do_wait)
525{
526 struct completion *waiting;
527 struct rq_map_data *mdata = &STp->buffer->map_data;
528 int ret;
529
530 /* if async, make sure there's no command outstanding */
531 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
532 printk(KERN_ERR "%s: Async command already active.\n",
533 tape_name(STp));
534 if (signal_pending(current))
535 (STp->buffer)->syscall_result = (-EINTR);
536 else
537 (STp->buffer)->syscall_result = (-EBUSY);
538 return NULL;
539 }
540
541 if (!SRpnt) {
542 SRpnt = st_allocate_request(STp);
543 if (!SRpnt)
544 return NULL;
545 }
546
547 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
548 which IO is outstanding. It's nulled out when the IO completes. */
549 if (!do_wait)
550 (STp->buffer)->last_SRpnt = SRpnt;
551
552 waiting = &STp->wait;
553 init_completion(waiting);
554 SRpnt->waiting = waiting;
555
556 if (STp->buffer->do_dio) {
557 mdata->page_order = 0;
558 mdata->nr_entries = STp->buffer->sg_segs;
559 mdata->pages = STp->buffer->mapped_pages;
560 } else {
561 mdata->page_order = STp->buffer->reserved_page_order;
562 mdata->nr_entries =
563 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
564 mdata->pages = STp->buffer->reserved_pages;
565 mdata->offset = 0;
566 }
567
568 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
569 STp->buffer->cmdstat.have_sense = 0;
570 STp->buffer->syscall_result = 0;
571
572 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
573 retries);
574 if (ret) {
575 /* could not allocate the buffer or request was too large */
576 (STp->buffer)->syscall_result = (-EBUSY);
577 (STp->buffer)->last_SRpnt = NULL;
578 } else if (do_wait) {
579 wait_for_completion(waiting);
580 SRpnt->waiting = NULL;
581 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
582 }
583
584 return SRpnt;
585}
586
587
588/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
589 write has been correct but EOM early warning reached, -EIO if write ended in
590 error or zero if write successful. Asynchronous writes are used only in
591 variable block mode. */
592static int write_behind_check(struct scsi_tape * STp)
593{
594 int retval = 0;
595 struct st_buffer *STbuffer;
596 struct st_partstat *STps;
597 struct st_cmdstatus *cmdstatp;
598 struct st_request *SRpnt;
599
600 STbuffer = STp->buffer;
601 if (!STbuffer->writing)
602 return 0;
603
604 DEB(
605 if (STp->write_pending)
606 STp->nbr_waits++;
607 else
608 STp->nbr_finished++;
609 ) /* end DEB */
610
611 wait_for_completion(&(STp->wait));
612 SRpnt = STbuffer->last_SRpnt;
613 STbuffer->last_SRpnt = NULL;
614 SRpnt->waiting = NULL;
615
616 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
617 st_release_request(SRpnt);
618
619 STbuffer->buffer_bytes -= STbuffer->writing;
620 STps = &(STp->ps[STp->partition]);
621 if (STps->drv_block >= 0) {
622 if (STp->block_size == 0)
623 STps->drv_block++;
624 else
625 STps->drv_block += STbuffer->writing / STp->block_size;
626 }
627
628 cmdstatp = &STbuffer->cmdstat;
629 if (STbuffer->syscall_result) {
630 retval = -EIO;
631 if (cmdstatp->have_sense && !cmdstatp->deferred &&
632 (cmdstatp->flags & SENSE_EOM) &&
633 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
634 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
635 /* EOM at write-behind, has all data been written? */
636 if (!cmdstatp->remainder_valid ||
637 cmdstatp->uremainder64 == 0)
638 retval = -ENOSPC;
639 }
640 if (retval == -EIO)
641 STps->drv_block = -1;
642 }
643 STbuffer->writing = 0;
644
645 DEB(if (debugging && retval)
646 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
647 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
648
649 return retval;
650}
651
652
653/* Step over EOF if it has been inadvertently crossed (ioctl not used because
654 it messes up the block number). */
655static int cross_eof(struct scsi_tape * STp, int forward)
656{
657 struct st_request *SRpnt;
658 unsigned char cmd[MAX_COMMAND_SIZE];
659
660 cmd[0] = SPACE;
661 cmd[1] = 0x01; /* Space FileMarks */
662 if (forward) {
663 cmd[2] = cmd[3] = 0;
664 cmd[4] = 1;
665 } else
666 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
667 cmd[5] = 0;
668
669 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
670 tape_name(STp), forward ? "forward" : "backward"));
671
672 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
673 STp->device->request_queue->rq_timeout,
674 MAX_RETRIES, 1);
675 if (!SRpnt)
676 return (STp->buffer)->syscall_result;
677
678 st_release_request(SRpnt);
679 SRpnt = NULL;
680
681 if ((STp->buffer)->cmdstat.midlevel_result != 0)
682 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
683 tape_name(STp), forward ? "forward" : "backward");
684
685 return (STp->buffer)->syscall_result;
686}
687
688
689/* Flush the write buffer (never need to write if variable blocksize). */
690static int st_flush_write_buffer(struct scsi_tape * STp)
691{
692 int transfer, blks;
693 int result;
694 unsigned char cmd[MAX_COMMAND_SIZE];
695 struct st_request *SRpnt;
696 struct st_partstat *STps;
697
698 result = write_behind_check(STp);
699 if (result)
700 return result;
701
702 result = 0;
703 if (STp->dirty == 1) {
704
705 transfer = STp->buffer->buffer_bytes;
706 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
707 tape_name(STp), transfer));
708
709 memset(cmd, 0, MAX_COMMAND_SIZE);
710 cmd[0] = WRITE_6;
711 cmd[1] = 1;
712 blks = transfer / STp->block_size;
713 cmd[2] = blks >> 16;
714 cmd[3] = blks >> 8;
715 cmd[4] = blks;
716
717 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
718 STp->device->request_queue->rq_timeout,
719 MAX_WRITE_RETRIES, 1);
720 if (!SRpnt)
721 return (STp->buffer)->syscall_result;
722
723 STps = &(STp->ps[STp->partition]);
724 if ((STp->buffer)->syscall_result != 0) {
725 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
726
727 if (cmdstatp->have_sense && !cmdstatp->deferred &&
728 (cmdstatp->flags & SENSE_EOM) &&
729 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
730 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
731 (!cmdstatp->remainder_valid ||
732 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
733 STp->dirty = 0;
734 (STp->buffer)->buffer_bytes = 0;
735 if (STps->drv_block >= 0)
736 STps->drv_block += blks;
737 result = (-ENOSPC);
738 } else {
739 printk(KERN_ERR "%s: Error on flush.\n",
740 tape_name(STp));
741 STps->drv_block = (-1);
742 result = (-EIO);
743 }
744 } else {
745 if (STps->drv_block >= 0)
746 STps->drv_block += blks;
747 STp->dirty = 0;
748 (STp->buffer)->buffer_bytes = 0;
749 }
750 st_release_request(SRpnt);
751 SRpnt = NULL;
752 }
753 return result;
754}
755
756
757/* Flush the tape buffer. The tape will be positioned correctly unless
758 seek_next is true. */
759static int flush_buffer(struct scsi_tape *STp, int seek_next)
760{
761 int backspace, result;
762 struct st_buffer *STbuffer;
763 struct st_partstat *STps;
764
765 STbuffer = STp->buffer;
766
767 /*
768 * If there was a bus reset, block further access
769 * to this device.
770 */
771 if (STp->pos_unknown)
772 return (-EIO);
773
774 if (STp->ready != ST_READY)
775 return 0;
776 STps = &(STp->ps[STp->partition]);
777 if (STps->rw == ST_WRITING) /* Writing */
778 return st_flush_write_buffer(STp);
779
780 if (STp->block_size == 0)
781 return 0;
782
783 backspace = ((STp->buffer)->buffer_bytes +
784 (STp->buffer)->read_pointer) / STp->block_size -
785 ((STp->buffer)->read_pointer + STp->block_size - 1) /
786 STp->block_size;
787 (STp->buffer)->buffer_bytes = 0;
788 (STp->buffer)->read_pointer = 0;
789 result = 0;
790 if (!seek_next) {
791 if (STps->eof == ST_FM_HIT) {
792 result = cross_eof(STp, 0); /* Back over the EOF hit */
793 if (!result)
794 STps->eof = ST_NOEOF;
795 else {
796 if (STps->drv_file >= 0)
797 STps->drv_file++;
798 STps->drv_block = 0;
799 }
800 }
801 if (!result && backspace > 0)
802 result = st_int_ioctl(STp, MTBSR, backspace);
803 } else if (STps->eof == ST_FM_HIT) {
804 if (STps->drv_file >= 0)
805 STps->drv_file++;
806 STps->drv_block = 0;
807 STps->eof = ST_NOEOF;
808 }
809 return result;
810
811}
812
813/* Set the mode parameters */
814static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
815{
816 int set_it = 0;
817 unsigned long arg;
818 char *name = tape_name(STp);
819
820 if (!STp->density_changed &&
821 STm->default_density >= 0 &&
822 STm->default_density != STp->density) {
823 arg = STm->default_density;
824 set_it = 1;
825 } else
826 arg = STp->density;
827 arg <<= MT_ST_DENSITY_SHIFT;
828 if (!STp->blksize_changed &&
829 STm->default_blksize >= 0 &&
830 STm->default_blksize != STp->block_size) {
831 arg |= STm->default_blksize;
832 set_it = 1;
833 } else
834 arg |= STp->block_size;
835 if (set_it &&
836 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
837 printk(KERN_WARNING
838 "%s: Can't set default block size to %d bytes and density %x.\n",
839 name, STm->default_blksize, STm->default_density);
840 if (modes_defined)
841 return (-EINVAL);
842 }
843 return 0;
844}
845
846
847/* Lock or unlock the drive door. Don't use when st_request allocated. */
848static int do_door_lock(struct scsi_tape * STp, int do_lock)
849{
850 int retval, cmd;
851 DEB(char *name = tape_name(STp);)
852
853
854 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
855 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
856 do_lock ? "L" : "Unl"));
857 retval = scsi_ioctl(STp->device, cmd, NULL);
858 if (!retval) {
859 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
860 }
861 else {
862 STp->door_locked = ST_LOCK_FAILS;
863 }
864 return retval;
865}
866
867
868/* Set the internal state after reset */
869static void reset_state(struct scsi_tape *STp)
870{
871 int i;
872 struct st_partstat *STps;
873
874 STp->pos_unknown = 0;
875 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
876 STps = &(STp->ps[i]);
877 STps->rw = ST_IDLE;
878 STps->eof = ST_NOEOF;
879 STps->at_sm = 0;
880 STps->last_block_valid = 0;
881 STps->drv_block = -1;
882 STps->drv_file = -1;
883 }
884 if (STp->can_partitions) {
885 STp->partition = find_partition(STp);
886 if (STp->partition < 0)
887 STp->partition = 0;
888 STp->new_partition = STp->partition;
889 }
890}
891
892/* Test if the drive is ready. Returns either one of the codes below or a negative system
893 error code. */
894#define CHKRES_READY 0
895#define CHKRES_NEW_SESSION 1
896#define CHKRES_NOT_READY 2
897#define CHKRES_NO_TAPE 3
898
899#define MAX_ATTENTIONS 10
900
901static int test_ready(struct scsi_tape *STp, int do_wait)
902{
903 int attentions, waits, max_wait, scode;
904 int retval = CHKRES_READY, new_session = 0;
905 unsigned char cmd[MAX_COMMAND_SIZE];
906 struct st_request *SRpnt = NULL;
907 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
908
909 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
910
911 for (attentions=waits=0; ; ) {
912 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
913 cmd[0] = TEST_UNIT_READY;
914 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
915 STp->long_timeout, MAX_READY_RETRIES, 1);
916
917 if (!SRpnt) {
918 retval = (STp->buffer)->syscall_result;
919 break;
920 }
921
922 if (cmdstatp->have_sense) {
923
924 scode = cmdstatp->sense_hdr.sense_key;
925
926 if (scode == UNIT_ATTENTION) { /* New media? */
927 new_session = 1;
928 if (attentions < MAX_ATTENTIONS) {
929 attentions++;
930 continue;
931 }
932 else {
933 retval = (-EIO);
934 break;
935 }
936 }
937
938 if (scode == NOT_READY) {
939 if (waits < max_wait) {
940 if (msleep_interruptible(1000)) {
941 retval = (-EINTR);
942 break;
943 }
944 waits++;
945 continue;
946 }
947 else {
948 if ((STp->device)->scsi_level >= SCSI_2 &&
949 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
950 retval = CHKRES_NO_TAPE;
951 else
952 retval = CHKRES_NOT_READY;
953 break;
954 }
955 }
956 }
957
958 retval = (STp->buffer)->syscall_result;
959 if (!retval)
960 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
961 break;
962 }
963
964 if (SRpnt != NULL)
965 st_release_request(SRpnt);
966 return retval;
967}
968
969
970/* See if the drive is ready and gather information about the tape. Return values:
971 < 0 negative error code from errno.h
972 0 drive ready
973 1 drive not ready (possibly no tape)
974*/
975static int check_tape(struct scsi_tape *STp, struct file *filp)
976{
977 int i, retval, new_session = 0, do_wait;
978 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
979 unsigned short st_flags = filp->f_flags;
980 struct st_request *SRpnt = NULL;
981 struct st_modedef *STm;
982 struct st_partstat *STps;
983 char *name = tape_name(STp);
984 struct inode *inode = filp->f_path.dentry->d_inode;
985 int mode = TAPE_MODE(inode);
986
987 STp->ready = ST_READY;
988
989 if (mode != STp->current_mode) {
990 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
991 name, STp->current_mode, mode));
992 new_session = 1;
993 STp->current_mode = mode;
994 }
995 STm = &(STp->modes[STp->current_mode]);
996
997 saved_cleaning = STp->cleaning_req;
998 STp->cleaning_req = 0;
999
1000 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1001 retval = test_ready(STp, do_wait);
1002
1003 if (retval < 0)
1004 goto err_out;
1005
1006 if (retval == CHKRES_NEW_SESSION) {
1007 STp->pos_unknown = 0;
1008 STp->partition = STp->new_partition = 0;
1009 if (STp->can_partitions)
1010 STp->nbr_partitions = 1; /* This guess will be updated later
1011 if necessary */
1012 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1013 STps = &(STp->ps[i]);
1014 STps->rw = ST_IDLE;
1015 STps->eof = ST_NOEOF;
1016 STps->at_sm = 0;
1017 STps->last_block_valid = 0;
1018 STps->drv_block = 0;
1019 STps->drv_file = 0;
1020 }
1021 new_session = 1;
1022 }
1023 else {
1024 STp->cleaning_req |= saved_cleaning;
1025
1026 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1027 if (retval == CHKRES_NO_TAPE)
1028 STp->ready = ST_NO_TAPE;
1029 else
1030 STp->ready = ST_NOT_READY;
1031
1032 STp->density = 0; /* Clear the erroneous "residue" */
1033 STp->write_prot = 0;
1034 STp->block_size = 0;
1035 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1036 STp->partition = STp->new_partition = 0;
1037 STp->door_locked = ST_UNLOCKED;
1038 return CHKRES_NOT_READY;
1039 }
1040 }
1041
1042 if (STp->omit_blklims)
1043 STp->min_block = STp->max_block = (-1);
1044 else {
1045 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1046 cmd[0] = READ_BLOCK_LIMITS;
1047
1048 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1049 STp->device->request_queue->rq_timeout,
1050 MAX_READY_RETRIES, 1);
1051 if (!SRpnt) {
1052 retval = (STp->buffer)->syscall_result;
1053 goto err_out;
1054 }
1055
1056 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1057 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1058 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1059 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1060 (STp->buffer)->b_data[5];
1061 if ( DEB( debugging || ) !STp->inited)
1062 printk(KERN_INFO
1063 "%s: Block limits %d - %d bytes.\n", name,
1064 STp->min_block, STp->max_block);
1065 } else {
1066 STp->min_block = STp->max_block = (-1);
1067 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1068 name));
1069 }
1070 }
1071
1072 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1073 cmd[0] = MODE_SENSE;
1074 cmd[4] = 12;
1075
1076 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1077 STp->device->request_queue->rq_timeout,
1078 MAX_READY_RETRIES, 1);
1079 if (!SRpnt) {
1080 retval = (STp->buffer)->syscall_result;
1081 goto err_out;
1082 }
1083
1084 if ((STp->buffer)->syscall_result != 0) {
1085 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1086 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1087 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1088 STp->drv_write_prot = 0;
1089 } else {
1090 DEBC(printk(ST_DEB_MSG
1091 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1092 name,
1093 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1094 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1095
1096 if ((STp->buffer)->b_data[3] >= 8) {
1097 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1098 STp->density = (STp->buffer)->b_data[4];
1099 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1100 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1101 DEBC(printk(ST_DEB_MSG
1102 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1103 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1104 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1105 STp->drv_buffer));
1106 }
1107 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1108 if (!STp->drv_buffer && STp->immediate_filemark) {
1109 printk(KERN_WARNING
1110 "%s: non-buffered tape: disabling writing immediate filemarks\n",
1111 name);
1112 STp->immediate_filemark = 0;
1113 }
1114 }
1115 st_release_request(SRpnt);
1116 SRpnt = NULL;
1117 STp->inited = 1;
1118
1119 if (STp->block_size > 0)
1120 (STp->buffer)->buffer_blocks =
1121 (STp->buffer)->buffer_size / STp->block_size;
1122 else
1123 (STp->buffer)->buffer_blocks = 1;
1124 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1125
1126 DEBC(printk(ST_DEB_MSG
1127 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1128 STp->block_size, (STp->buffer)->buffer_size,
1129 (STp->buffer)->buffer_blocks));
1130
1131 if (STp->drv_write_prot) {
1132 STp->write_prot = 1;
1133
1134 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1135
1136 if (do_wait &&
1137 ((st_flags & O_ACCMODE) == O_WRONLY ||
1138 (st_flags & O_ACCMODE) == O_RDWR)) {
1139 retval = (-EROFS);
1140 goto err_out;
1141 }
1142 }
1143
1144 if (STp->can_partitions && STp->nbr_partitions < 1) {
1145 /* This code is reached when the device is opened for the first time
1146 after the driver has been initialized with tape in the drive and the
1147 partition support has been enabled. */
1148 DEBC(printk(ST_DEB_MSG
1149 "%s: Updating partition number in status.\n", name));
1150 if ((STp->partition = find_partition(STp)) < 0) {
1151 retval = STp->partition;
1152 goto err_out;
1153 }
1154 STp->new_partition = STp->partition;
1155 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1156 }
1157
1158 if (new_session) { /* Change the drive parameters for the new mode */
1159 STp->density_changed = STp->blksize_changed = 0;
1160 STp->compression_changed = 0;
1161 if (!(STm->defaults_for_writes) &&
1162 (retval = set_mode_densblk(STp, STm)) < 0)
1163 goto err_out;
1164
1165 if (STp->default_drvbuffer != 0xff) {
1166 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1167 printk(KERN_WARNING
1168 "%s: Can't set default drive buffering to %d.\n",
1169 name, STp->default_drvbuffer);
1170 }
1171 }
1172
1173 return CHKRES_READY;
1174
1175 err_out:
1176 return retval;
1177}
1178
1179
1180 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1181 module count. */
1182static int st_open(struct inode *inode, struct file *filp)
1183{
1184 int i, retval = (-EIO);
1185 int resumed = 0;
1186 struct scsi_tape *STp;
1187 struct st_partstat *STps;
1188 int dev = TAPE_NR(inode);
1189 char *name;
1190
1191 mutex_lock(&st_mutex);
1192 /*
1193 * We really want to do nonseekable_open(inode, filp); here, but some
1194 * versions of tar incorrectly call lseek on tapes and bail out if that
1195 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1196 */
1197 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1198
1199 if (!(STp = scsi_tape_get(dev))) {
1200 mutex_unlock(&st_mutex);
1201 return -ENXIO;
1202 }
1203
1204 write_lock(&st_dev_arr_lock);
1205 filp->private_data = STp;
1206 name = tape_name(STp);
1207
1208 if (STp->in_use) {
1209 write_unlock(&st_dev_arr_lock);
1210 scsi_tape_put(STp);
1211 mutex_unlock(&st_mutex);
1212 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1213 return (-EBUSY);
1214 }
1215
1216 STp->in_use = 1;
1217 write_unlock(&st_dev_arr_lock);
1218 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1219
1220 if (scsi_autopm_get_device(STp->device) < 0) {
1221 retval = -EIO;
1222 goto err_out;
1223 }
1224 resumed = 1;
1225 if (!scsi_block_when_processing_errors(STp->device)) {
1226 retval = (-ENXIO);
1227 goto err_out;
1228 }
1229
1230 /* See that we have at least a one page buffer available */
1231 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1232 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1233 name);
1234 retval = (-EOVERFLOW);
1235 goto err_out;
1236 }
1237
1238 (STp->buffer)->cleared = 0;
1239 (STp->buffer)->writing = 0;
1240 (STp->buffer)->syscall_result = 0;
1241
1242 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1243
1244 STp->dirty = 0;
1245 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1246 STps = &(STp->ps[i]);
1247 STps->rw = ST_IDLE;
1248 }
1249 STp->try_dio_now = STp->try_dio;
1250 STp->recover_count = 0;
1251 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1252 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1253
1254 retval = check_tape(STp, filp);
1255 if (retval < 0)
1256 goto err_out;
1257 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1258 retval != CHKRES_READY) {
1259 if (STp->ready == NO_TAPE)
1260 retval = (-ENOMEDIUM);
1261 else
1262 retval = (-EIO);
1263 goto err_out;
1264 }
1265 mutex_unlock(&st_mutex);
1266 return 0;
1267
1268 err_out:
1269 normalize_buffer(STp->buffer);
1270 STp->in_use = 0;
1271 scsi_tape_put(STp);
1272 if (resumed)
1273 scsi_autopm_put_device(STp->device);
1274 mutex_unlock(&st_mutex);
1275 return retval;
1276
1277}
1278
1279
1280/* Flush the tape buffer before close */
1281static int st_flush(struct file *filp, fl_owner_t id)
1282{
1283 int result = 0, result2;
1284 unsigned char cmd[MAX_COMMAND_SIZE];
1285 struct st_request *SRpnt;
1286 struct scsi_tape *STp = filp->private_data;
1287 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1288 struct st_partstat *STps = &(STp->ps[STp->partition]);
1289 char *name = tape_name(STp);
1290
1291 if (file_count(filp) > 1)
1292 return 0;
1293
1294 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1295 result = st_flush_write_buffer(STp);
1296 if (result != 0 && result != (-ENOSPC))
1297 goto out;
1298 }
1299
1300 if (STp->can_partitions &&
1301 (result2 = switch_partition(STp)) < 0) {
1302 DEBC(printk(ST_DEB_MSG
1303 "%s: switch_partition at close failed.\n", name));
1304 if (result == 0)
1305 result = result2;
1306 goto out;
1307 }
1308
1309 DEBC( if (STp->nbr_requests)
1310 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1311 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1312
1313 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1314 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1315
1316 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1317 name, STp->nbr_waits, STp->nbr_finished);
1318 )
1319
1320 memset(cmd, 0, MAX_COMMAND_SIZE);
1321 cmd[0] = WRITE_FILEMARKS;
1322 if (STp->immediate_filemark)
1323 cmd[1] = 1;
1324 cmd[4] = 1 + STp->two_fm;
1325
1326 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1327 STp->device->request_queue->rq_timeout,
1328 MAX_WRITE_RETRIES, 1);
1329 if (!SRpnt) {
1330 result = (STp->buffer)->syscall_result;
1331 goto out;
1332 }
1333
1334 if (STp->buffer->syscall_result == 0 ||
1335 (cmdstatp->have_sense && !cmdstatp->deferred &&
1336 (cmdstatp->flags & SENSE_EOM) &&
1337 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1338 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1339 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1340 /* Write successful at EOM */
1341 st_release_request(SRpnt);
1342 SRpnt = NULL;
1343 if (STps->drv_file >= 0)
1344 STps->drv_file++;
1345 STps->drv_block = 0;
1346 if (STp->two_fm)
1347 cross_eof(STp, 0);
1348 STps->eof = ST_FM;
1349 }
1350 else { /* Write error */
1351 st_release_request(SRpnt);
1352 SRpnt = NULL;
1353 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1354 if (result == 0)
1355 result = (-EIO);
1356 }
1357
1358 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1359 name, cmd[4]));
1360 } else if (!STp->rew_at_close) {
1361 STps = &(STp->ps[STp->partition]);
1362 if (!STm->sysv || STps->rw != ST_READING) {
1363 if (STp->can_bsr)
1364 result = flush_buffer(STp, 0);
1365 else if (STps->eof == ST_FM_HIT) {
1366 result = cross_eof(STp, 0);
1367 if (result) {
1368 if (STps->drv_file >= 0)
1369 STps->drv_file++;
1370 STps->drv_block = 0;
1371 STps->eof = ST_FM;
1372 } else
1373 STps->eof = ST_NOEOF;
1374 }
1375 } else if ((STps->eof == ST_NOEOF &&
1376 !(result = cross_eof(STp, 1))) ||
1377 STps->eof == ST_FM_HIT) {
1378 if (STps->drv_file >= 0)
1379 STps->drv_file++;
1380 STps->drv_block = 0;
1381 STps->eof = ST_FM;
1382 }
1383 }
1384
1385 out:
1386 if (STp->rew_at_close) {
1387 result2 = st_int_ioctl(STp, MTREW, 1);
1388 if (result == 0)
1389 result = result2;
1390 }
1391 return result;
1392}
1393
1394
1395/* Close the device and release it. BKL is not needed: this is the only thread
1396 accessing this tape. */
1397static int st_release(struct inode *inode, struct file *filp)
1398{
1399 int result = 0;
1400 struct scsi_tape *STp = filp->private_data;
1401
1402 if (STp->door_locked == ST_LOCKED_AUTO)
1403 do_door_lock(STp, 0);
1404
1405 normalize_buffer(STp->buffer);
1406 write_lock(&st_dev_arr_lock);
1407 STp->in_use = 0;
1408 write_unlock(&st_dev_arr_lock);
1409 scsi_autopm_put_device(STp->device);
1410 scsi_tape_put(STp);
1411
1412 return result;
1413}
1414
1415/* The checks common to both reading and writing */
1416static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1417{
1418 ssize_t retval = 0;
1419
1420 /*
1421 * If we are in the middle of error recovery, don't let anyone
1422 * else try and use this device. Also, if error recovery fails, it
1423 * may try and take the device offline, in which case all further
1424 * access to the device is prohibited.
1425 */
1426 if (!scsi_block_when_processing_errors(STp->device)) {
1427 retval = (-ENXIO);
1428 goto out;
1429 }
1430
1431 if (STp->ready != ST_READY) {
1432 if (STp->ready == ST_NO_TAPE)
1433 retval = (-ENOMEDIUM);
1434 else
1435 retval = (-EIO);
1436 goto out;
1437 }
1438
1439 if (! STp->modes[STp->current_mode].defined) {
1440 retval = (-ENXIO);
1441 goto out;
1442 }
1443
1444
1445 /*
1446 * If there was a bus reset, block further access
1447 * to this device.
1448 */
1449 if (STp->pos_unknown) {
1450 retval = (-EIO);
1451 goto out;
1452 }
1453
1454 if (count == 0)
1455 goto out;
1456
1457 DEB(
1458 if (!STp->in_use) {
1459 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1460 retval = (-EIO);
1461 goto out;
1462 } ) /* end DEB */
1463
1464 if (STp->can_partitions &&
1465 (retval = switch_partition(STp)) < 0)
1466 goto out;
1467
1468 if (STp->block_size == 0 && STp->max_block > 0 &&
1469 (count < STp->min_block || count > STp->max_block)) {
1470 retval = (-EINVAL);
1471 goto out;
1472 }
1473
1474 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1475 !do_door_lock(STp, 1))
1476 STp->door_locked = ST_LOCKED_AUTO;
1477
1478 out:
1479 return retval;
1480}
1481
1482
1483static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1484 size_t count, int is_read)
1485{
1486 int i, bufsize, retval = 0;
1487 struct st_buffer *STbp = STp->buffer;
1488
1489 if (is_read)
1490 i = STp->try_dio_now && try_rdio;
1491 else
1492 i = STp->try_dio_now && try_wdio;
1493
1494 if (i && ((unsigned long)buf & queue_dma_alignment(
1495 STp->device->request_queue)) == 0) {
1496 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1497 count, (is_read ? READ : WRITE));
1498 if (i > 0) {
1499 STbp->do_dio = i;
1500 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1501 }
1502 else
1503 STbp->do_dio = 0; /* fall back to buffering with any error */
1504 STbp->sg_segs = STbp->do_dio;
1505 DEB(
1506 if (STbp->do_dio) {
1507 STp->nbr_dio++;
1508 STp->nbr_pages += STbp->do_dio;
1509 }
1510 )
1511 } else
1512 STbp->do_dio = 0;
1513 DEB( STp->nbr_requests++; )
1514
1515 if (!STbp->do_dio) {
1516 if (STp->block_size)
1517 bufsize = STp->block_size > st_fixed_buffer_size ?
1518 STp->block_size : st_fixed_buffer_size;
1519 else {
1520 bufsize = count;
1521 /* Make sure that data from previous user is not leaked even if
1522 HBA does not return correct residual */
1523 if (is_read && STp->sili && !STbp->cleared)
1524 clear_buffer(STbp);
1525 }
1526
1527 if (bufsize > STbp->buffer_size &&
1528 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1529 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1530 tape_name(STp), bufsize);
1531 retval = (-EOVERFLOW);
1532 goto out;
1533 }
1534 if (STp->block_size)
1535 STbp->buffer_blocks = bufsize / STp->block_size;
1536 }
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543/* Can be called more than once after each setup_buffer() */
1544static void release_buffering(struct scsi_tape *STp, int is_read)
1545{
1546 struct st_buffer *STbp;
1547
1548 STbp = STp->buffer;
1549 if (STbp->do_dio) {
1550 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1551 STbp->do_dio = 0;
1552 STbp->sg_segs = 0;
1553 }
1554}
1555
1556
1557/* Write command */
1558static ssize_t
1559st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1560{
1561 ssize_t total;
1562 ssize_t i, do_count, blks, transfer;
1563 ssize_t retval;
1564 int undone, retry_eot = 0, scode;
1565 int async_write;
1566 unsigned char cmd[MAX_COMMAND_SIZE];
1567 const char __user *b_point;
1568 struct st_request *SRpnt = NULL;
1569 struct scsi_tape *STp = filp->private_data;
1570 struct st_modedef *STm;
1571 struct st_partstat *STps;
1572 struct st_buffer *STbp;
1573 char *name = tape_name(STp);
1574
1575 if (mutex_lock_interruptible(&STp->lock))
1576 return -ERESTARTSYS;
1577
1578 retval = rw_checks(STp, filp, count);
1579 if (retval || count == 0)
1580 goto out;
1581
1582 /* Write must be integral number of blocks */
1583 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1584 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1585 name);
1586 retval = (-EINVAL);
1587 goto out;
1588 }
1589
1590 STm = &(STp->modes[STp->current_mode]);
1591 STps = &(STp->ps[STp->partition]);
1592
1593 if (STp->write_prot) {
1594 retval = (-EACCES);
1595 goto out;
1596 }
1597
1598
1599 if (STps->rw == ST_READING) {
1600 retval = flush_buffer(STp, 0);
1601 if (retval)
1602 goto out;
1603 STps->rw = ST_WRITING;
1604 } else if (STps->rw != ST_WRITING &&
1605 STps->drv_file == 0 && STps->drv_block == 0) {
1606 if ((retval = set_mode_densblk(STp, STm)) < 0)
1607 goto out;
1608 if (STm->default_compression != ST_DONT_TOUCH &&
1609 !(STp->compression_changed)) {
1610 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1611 printk(KERN_WARNING "%s: Can't set default compression.\n",
1612 name);
1613 if (modes_defined) {
1614 retval = (-EINVAL);
1615 goto out;
1616 }
1617 }
1618 }
1619 }
1620
1621 STbp = STp->buffer;
1622 i = write_behind_check(STp);
1623 if (i) {
1624 if (i == -ENOSPC)
1625 STps->eof = ST_EOM_OK;
1626 else
1627 STps->eof = ST_EOM_ERROR;
1628 }
1629
1630 if (STps->eof == ST_EOM_OK) {
1631 STps->eof = ST_EOD_1; /* allow next write */
1632 retval = (-ENOSPC);
1633 goto out;
1634 }
1635 else if (STps->eof == ST_EOM_ERROR) {
1636 retval = (-EIO);
1637 goto out;
1638 }
1639
1640 /* Check the buffer readability in cases where copy_user might catch
1641 the problems after some tape movement. */
1642 if (STp->block_size != 0 &&
1643 !STbp->do_dio &&
1644 (copy_from_user(&i, buf, 1) != 0 ||
1645 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1646 retval = (-EFAULT);
1647 goto out;
1648 }
1649
1650 retval = setup_buffering(STp, buf, count, 0);
1651 if (retval)
1652 goto out;
1653
1654 total = count;
1655
1656 memset(cmd, 0, MAX_COMMAND_SIZE);
1657 cmd[0] = WRITE_6;
1658 cmd[1] = (STp->block_size != 0);
1659
1660 STps->rw = ST_WRITING;
1661
1662 b_point = buf;
1663 while (count > 0 && !retry_eot) {
1664
1665 if (STbp->do_dio) {
1666 do_count = count;
1667 }
1668 else {
1669 if (STp->block_size == 0)
1670 do_count = count;
1671 else {
1672 do_count = STbp->buffer_blocks * STp->block_size -
1673 STbp->buffer_bytes;
1674 if (do_count > count)
1675 do_count = count;
1676 }
1677
1678 i = append_to_buffer(b_point, STbp, do_count);
1679 if (i) {
1680 retval = i;
1681 goto out;
1682 }
1683 }
1684 count -= do_count;
1685 b_point += do_count;
1686
1687 async_write = STp->block_size == 0 && !STbp->do_dio &&
1688 STm->do_async_writes && STps->eof < ST_EOM_OK;
1689
1690 if (STp->block_size != 0 && STm->do_buffer_writes &&
1691 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1692 STbp->buffer_bytes < STbp->buffer_size) {
1693 STp->dirty = 1;
1694 /* Don't write a buffer that is not full enough. */
1695 if (!async_write && count == 0)
1696 break;
1697 }
1698
1699 retry_write:
1700 if (STp->block_size == 0)
1701 blks = transfer = do_count;
1702 else {
1703 if (!STbp->do_dio)
1704 blks = STbp->buffer_bytes;
1705 else
1706 blks = do_count;
1707 blks /= STp->block_size;
1708 transfer = blks * STp->block_size;
1709 }
1710 cmd[2] = blks >> 16;
1711 cmd[3] = blks >> 8;
1712 cmd[4] = blks;
1713
1714 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1715 STp->device->request_queue->rq_timeout,
1716 MAX_WRITE_RETRIES, !async_write);
1717 if (!SRpnt) {
1718 retval = STbp->syscall_result;
1719 goto out;
1720 }
1721 if (async_write && !STbp->syscall_result) {
1722 STbp->writing = transfer;
1723 STp->dirty = !(STbp->writing ==
1724 STbp->buffer_bytes);
1725 SRpnt = NULL; /* Prevent releasing this request! */
1726 DEB( STp->write_pending = 1; )
1727 break;
1728 }
1729
1730 if (STbp->syscall_result != 0) {
1731 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1732
1733 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1734 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1735 scode = cmdstatp->sense_hdr.sense_key;
1736 if (cmdstatp->remainder_valid)
1737 undone = (int)cmdstatp->uremainder64;
1738 else if (STp->block_size == 0 &&
1739 scode == VOLUME_OVERFLOW)
1740 undone = transfer;
1741 else
1742 undone = 0;
1743 if (STp->block_size != 0)
1744 undone *= STp->block_size;
1745 if (undone <= do_count) {
1746 /* Only data from this write is not written */
1747 count += undone;
1748 b_point -= undone;
1749 do_count -= undone;
1750 if (STp->block_size)
1751 blks = (transfer - undone) / STp->block_size;
1752 STps->eof = ST_EOM_OK;
1753 /* Continue in fixed block mode if all written
1754 in this request but still something left to write
1755 (retval left to zero)
1756 */
1757 if (STp->block_size == 0 ||
1758 undone > 0 || count == 0)
1759 retval = (-ENOSPC); /* EOM within current request */
1760 DEBC(printk(ST_DEB_MSG
1761 "%s: EOM with %d bytes unwritten.\n",
1762 name, (int)count));
1763 } else {
1764 /* EOT within data buffered earlier (possible only
1765 in fixed block mode without direct i/o) */
1766 if (!retry_eot && !cmdstatp->deferred &&
1767 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1768 move_buffer_data(STp->buffer, transfer - undone);
1769 retry_eot = 1;
1770 if (STps->drv_block >= 0) {
1771 STps->drv_block += (transfer - undone) /
1772 STp->block_size;
1773 }
1774 STps->eof = ST_EOM_OK;
1775 DEBC(printk(ST_DEB_MSG
1776 "%s: Retry write of %d bytes at EOM.\n",
1777 name, STp->buffer->buffer_bytes));
1778 goto retry_write;
1779 }
1780 else {
1781 /* Either error within data buffered by driver or
1782 failed retry */
1783 count -= do_count;
1784 blks = do_count = 0;
1785 STps->eof = ST_EOM_ERROR;
1786 STps->drv_block = (-1); /* Too cautious? */
1787 retval = (-EIO); /* EOM for old data */
1788 DEBC(printk(ST_DEB_MSG
1789 "%s: EOM with lost data.\n",
1790 name));
1791 }
1792 }
1793 } else {
1794 count += do_count;
1795 STps->drv_block = (-1); /* Too cautious? */
1796 retval = STbp->syscall_result;
1797 }
1798
1799 }
1800
1801 if (STps->drv_block >= 0) {
1802 if (STp->block_size == 0)
1803 STps->drv_block += (do_count > 0);
1804 else
1805 STps->drv_block += blks;
1806 }
1807
1808 STbp->buffer_bytes = 0;
1809 STp->dirty = 0;
1810
1811 if (retval || retry_eot) {
1812 if (count < total)
1813 retval = total - count;
1814 goto out;
1815 }
1816 }
1817
1818 if (STps->eof == ST_EOD_1)
1819 STps->eof = ST_EOM_OK;
1820 else if (STps->eof != ST_EOM_OK)
1821 STps->eof = ST_NOEOF;
1822 retval = total - count;
1823
1824 out:
1825 if (SRpnt != NULL)
1826 st_release_request(SRpnt);
1827 release_buffering(STp, 0);
1828 mutex_unlock(&STp->lock);
1829
1830 return retval;
1831}
1832
1833/* Read data from the tape. Returns zero in the normal case, one if the
1834 eof status has changed, and the negative error code in case of a
1835 fatal error. Otherwise updates the buffer and the eof state.
1836
1837 Does release user buffer mapping if it is set.
1838*/
1839static long read_tape(struct scsi_tape *STp, long count,
1840 struct st_request ** aSRpnt)
1841{
1842 int transfer, blks, bytes;
1843 unsigned char cmd[MAX_COMMAND_SIZE];
1844 struct st_request *SRpnt;
1845 struct st_modedef *STm;
1846 struct st_partstat *STps;
1847 struct st_buffer *STbp;
1848 int retval = 0;
1849 char *name = tape_name(STp);
1850
1851 if (count == 0)
1852 return 0;
1853
1854 STm = &(STp->modes[STp->current_mode]);
1855 STps = &(STp->ps[STp->partition]);
1856 if (STps->eof == ST_FM_HIT)
1857 return 1;
1858 STbp = STp->buffer;
1859
1860 if (STp->block_size == 0)
1861 blks = bytes = count;
1862 else {
1863 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1864 blks = (STp->buffer)->buffer_blocks;
1865 bytes = blks * STp->block_size;
1866 } else {
1867 bytes = count;
1868 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1869 bytes = (STp->buffer)->buffer_size;
1870 blks = bytes / STp->block_size;
1871 bytes = blks * STp->block_size;
1872 }
1873 }
1874
1875 memset(cmd, 0, MAX_COMMAND_SIZE);
1876 cmd[0] = READ_6;
1877 cmd[1] = (STp->block_size != 0);
1878 if (!cmd[1] && STp->sili)
1879 cmd[1] |= 2;
1880 cmd[2] = blks >> 16;
1881 cmd[3] = blks >> 8;
1882 cmd[4] = blks;
1883
1884 SRpnt = *aSRpnt;
1885 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1886 STp->device->request_queue->rq_timeout,
1887 MAX_RETRIES, 1);
1888 release_buffering(STp, 1);
1889 *aSRpnt = SRpnt;
1890 if (!SRpnt)
1891 return STbp->syscall_result;
1892
1893 STbp->read_pointer = 0;
1894 STps->at_sm = 0;
1895
1896 /* Something to check */
1897 if (STbp->syscall_result) {
1898 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1899
1900 retval = 1;
1901 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1902 name,
1903 SRpnt->sense[0], SRpnt->sense[1],
1904 SRpnt->sense[2], SRpnt->sense[3],
1905 SRpnt->sense[4], SRpnt->sense[5],
1906 SRpnt->sense[6], SRpnt->sense[7]));
1907 if (cmdstatp->have_sense) {
1908
1909 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1910 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1911
1912 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1913 /* Compute the residual count */
1914 if (cmdstatp->remainder_valid)
1915 transfer = (int)cmdstatp->uremainder64;
1916 else
1917 transfer = 0;
1918 if (STp->block_size == 0 &&
1919 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1920 transfer = bytes;
1921
1922 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1923 if (STp->block_size == 0) {
1924 if (transfer <= 0) {
1925 if (transfer < 0)
1926 printk(KERN_NOTICE
1927 "%s: Failed to read %d byte block with %d byte transfer.\n",
1928 name, bytes - transfer, bytes);
1929 if (STps->drv_block >= 0)
1930 STps->drv_block += 1;
1931 STbp->buffer_bytes = 0;
1932 return (-ENOMEM);
1933 }
1934 STbp->buffer_bytes = bytes - transfer;
1935 } else {
1936 st_release_request(SRpnt);
1937 SRpnt = *aSRpnt = NULL;
1938 if (transfer == blks) { /* We did not get anything, error */
1939 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1940 if (STps->drv_block >= 0)
1941 STps->drv_block += blks - transfer + 1;
1942 st_int_ioctl(STp, MTBSR, 1);
1943 return (-EIO);
1944 }
1945 /* We have some data, deliver it */
1946 STbp->buffer_bytes = (blks - transfer) *
1947 STp->block_size;
1948 DEBC(printk(ST_DEB_MSG
1949 "%s: ILI but enough data received %ld %d.\n",
1950 name, count, STbp->buffer_bytes));
1951 if (STps->drv_block >= 0)
1952 STps->drv_block += 1;
1953 if (st_int_ioctl(STp, MTBSR, 1))
1954 return (-EIO);
1955 }
1956 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1957 if (STps->eof != ST_FM_HIT)
1958 STps->eof = ST_FM_HIT;
1959 else
1960 STps->eof = ST_EOD_2;
1961 if (STp->block_size == 0)
1962 STbp->buffer_bytes = 0;
1963 else
1964 STbp->buffer_bytes =
1965 bytes - transfer * STp->block_size;
1966 DEBC(printk(ST_DEB_MSG
1967 "%s: EOF detected (%d bytes read).\n",
1968 name, STbp->buffer_bytes));
1969 } else if (cmdstatp->flags & SENSE_EOM) {
1970 if (STps->eof == ST_FM)
1971 STps->eof = ST_EOD_1;
1972 else
1973 STps->eof = ST_EOM_OK;
1974 if (STp->block_size == 0)
1975 STbp->buffer_bytes = bytes - transfer;
1976 else
1977 STbp->buffer_bytes =
1978 bytes - transfer * STp->block_size;
1979
1980 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1981 name, STbp->buffer_bytes));
1982 }
1983 }
1984 /* end of EOF, EOM, ILI test */
1985 else { /* nonzero sense key */
1986 DEBC(printk(ST_DEB_MSG
1987 "%s: Tape error while reading.\n", name));
1988 STps->drv_block = (-1);
1989 if (STps->eof == ST_FM &&
1990 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1991 DEBC(printk(ST_DEB_MSG
1992 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1993 name));
1994 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1995 } else /* Some other extended sense code */
1996 retval = (-EIO);
1997 }
1998
1999 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2000 STbp->buffer_bytes = 0;
2001 }
2002 /* End of extended sense test */
2003 else { /* Non-extended sense */
2004 retval = STbp->syscall_result;
2005 }
2006
2007 }
2008 /* End of error handling */
2009 else { /* Read successful */
2010 STbp->buffer_bytes = bytes;
2011 if (STp->sili) /* In fixed block mode residual is always zero here */
2012 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2013 }
2014
2015 if (STps->drv_block >= 0) {
2016 if (STp->block_size == 0)
2017 STps->drv_block++;
2018 else
2019 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2020 }
2021 return retval;
2022}
2023
2024
2025/* Read command */
2026static ssize_t
2027st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2028{
2029 ssize_t total;
2030 ssize_t retval = 0;
2031 ssize_t i, transfer;
2032 int special, do_dio = 0;
2033 struct st_request *SRpnt = NULL;
2034 struct scsi_tape *STp = filp->private_data;
2035 struct st_modedef *STm;
2036 struct st_partstat *STps;
2037 struct st_buffer *STbp = STp->buffer;
2038 DEB( char *name = tape_name(STp); )
2039
2040 if (mutex_lock_interruptible(&STp->lock))
2041 return -ERESTARTSYS;
2042
2043 retval = rw_checks(STp, filp, count);
2044 if (retval || count == 0)
2045 goto out;
2046
2047 STm = &(STp->modes[STp->current_mode]);
2048 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2049 if (!STm->do_read_ahead) {
2050 retval = (-EINVAL); /* Read must be integral number of blocks */
2051 goto out;
2052 }
2053 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2054 }
2055
2056 STps = &(STp->ps[STp->partition]);
2057 if (STps->rw == ST_WRITING) {
2058 retval = flush_buffer(STp, 0);
2059 if (retval)
2060 goto out;
2061 STps->rw = ST_READING;
2062 }
2063 DEB(
2064 if (debugging && STps->eof != ST_NOEOF)
2065 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2066 STps->eof, STbp->buffer_bytes);
2067 ) /* end DEB */
2068
2069 retval = setup_buffering(STp, buf, count, 1);
2070 if (retval)
2071 goto out;
2072 do_dio = STbp->do_dio;
2073
2074 if (STbp->buffer_bytes == 0 &&
2075 STps->eof >= ST_EOD_1) {
2076 if (STps->eof < ST_EOD) {
2077 STps->eof += 1;
2078 retval = 0;
2079 goto out;
2080 }
2081 retval = (-EIO); /* EOM or Blank Check */
2082 goto out;
2083 }
2084
2085 if (do_dio) {
2086 /* Check the buffer writability before any tape movement. Don't alter
2087 buffer data. */
2088 if (copy_from_user(&i, buf, 1) != 0 ||
2089 copy_to_user(buf, &i, 1) != 0 ||
2090 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2091 copy_to_user(buf + count - 1, &i, 1) != 0) {
2092 retval = (-EFAULT);
2093 goto out;
2094 }
2095 }
2096
2097 STps->rw = ST_READING;
2098
2099
2100 /* Loop until enough data in buffer or a special condition found */
2101 for (total = 0, special = 0; total < count && !special;) {
2102
2103 /* Get new data if the buffer is empty */
2104 if (STbp->buffer_bytes == 0) {
2105 special = read_tape(STp, count - total, &SRpnt);
2106 if (special < 0) { /* No need to continue read */
2107 retval = special;
2108 goto out;
2109 }
2110 }
2111
2112 /* Move the data from driver buffer to user buffer */
2113 if (STbp->buffer_bytes > 0) {
2114 DEB(
2115 if (debugging && STps->eof != ST_NOEOF)
2116 printk(ST_DEB_MSG
2117 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2118 STps->eof, STbp->buffer_bytes,
2119 (int)(count - total));
2120 ) /* end DEB */
2121 transfer = STbp->buffer_bytes < count - total ?
2122 STbp->buffer_bytes : count - total;
2123 if (!do_dio) {
2124 i = from_buffer(STbp, buf, transfer);
2125 if (i) {
2126 retval = i;
2127 goto out;
2128 }
2129 }
2130 buf += transfer;
2131 total += transfer;
2132 }
2133
2134 if (STp->block_size == 0)
2135 break; /* Read only one variable length block */
2136
2137 } /* for (total = 0, special = 0;
2138 total < count && !special; ) */
2139
2140 /* Change the eof state if no data from tape or buffer */
2141 if (total == 0) {
2142 if (STps->eof == ST_FM_HIT) {
2143 STps->eof = ST_FM;
2144 STps->drv_block = 0;
2145 if (STps->drv_file >= 0)
2146 STps->drv_file++;
2147 } else if (STps->eof == ST_EOD_1) {
2148 STps->eof = ST_EOD_2;
2149 STps->drv_block = 0;
2150 if (STps->drv_file >= 0)
2151 STps->drv_file++;
2152 } else if (STps->eof == ST_EOD_2)
2153 STps->eof = ST_EOD;
2154 } else if (STps->eof == ST_FM)
2155 STps->eof = ST_NOEOF;
2156 retval = total;
2157
2158 out:
2159 if (SRpnt != NULL) {
2160 st_release_request(SRpnt);
2161 SRpnt = NULL;
2162 }
2163 if (do_dio) {
2164 release_buffering(STp, 1);
2165 STbp->buffer_bytes = 0;
2166 }
2167 mutex_unlock(&STp->lock);
2168
2169 return retval;
2170}
2171
2172
2173
2174DEB(
2175/* Set the driver options */
2176static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2177{
2178 if (debugging) {
2179 printk(KERN_INFO
2180 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2181 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2182 STm->do_read_ahead);
2183 printk(KERN_INFO
2184 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2185 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2186 printk(KERN_INFO
2187 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2188 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2189 STp->scsi2_logical);
2190 printk(KERN_INFO
2191 "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n",
2192 name, STm->sysv, STp->immediate, STp->sili,
2193 STp->immediate_filemark);
2194 printk(KERN_INFO "%s: debugging: %d\n",
2195 name, debugging);
2196 }
2197}
2198 )
2199
2200
2201static int st_set_options(struct scsi_tape *STp, long options)
2202{
2203 int value;
2204 long code;
2205 struct st_modedef *STm;
2206 char *name = tape_name(STp);
2207 struct cdev *cd0, *cd1;
2208
2209 STm = &(STp->modes[STp->current_mode]);
2210 if (!STm->defined) {
2211 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2212 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2213 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
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, nbr, 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 nbr = max_segs - STbuffer->frp_segs;
3740 if (nbr <= 0)
3741 return 0;
3742
3743 priority = GFP_KERNEL | __GFP_NOWARN;
3744 if (need_dma)
3745 priority |= GFP_DMA;
3746
3747 if (STbuffer->cleared)
3748 priority |= __GFP_ZERO;
3749
3750 if (STbuffer->frp_segs) {
3751 order = STbuffer->reserved_page_order;
3752 b_size = PAGE_SIZE << order;
3753 } else {
3754 for (b_size = PAGE_SIZE, order = 0;
3755 order < ST_MAX_ORDER &&
3756 max_segs * (PAGE_SIZE << order) < new_size;
3757 order++, b_size *= 2)
3758 ; /* empty */
3759 STbuffer->reserved_page_order = order;
3760 }
3761 if (max_segs * (PAGE_SIZE << order) < new_size) {
3762 if (order == ST_MAX_ORDER)
3763 return 0;
3764 normalize_buffer(STbuffer);
3765 return enlarge_buffer(STbuffer, new_size, need_dma);
3766 }
3767
3768 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3769 segs < max_segs && got < new_size;) {
3770 struct page *page;
3771
3772 page = alloc_pages(priority, order);
3773 if (!page) {
3774 DEB(STbuffer->buffer_size = got);
3775 normalize_buffer(STbuffer);
3776 return 0;
3777 }
3778
3779 STbuffer->frp_segs += 1;
3780 got += b_size;
3781 STbuffer->buffer_size = got;
3782 STbuffer->reserved_pages[segs] = page;
3783 segs++;
3784 }
3785 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3786
3787 return 1;
3788}
3789
3790
3791/* Make sure that no data from previous user is in the internal buffer */
3792static void clear_buffer(struct st_buffer * st_bp)
3793{
3794 int i;
3795
3796 for (i=0; i < st_bp->frp_segs; i++)
3797 memset(page_address(st_bp->reserved_pages[i]), 0,
3798 PAGE_SIZE << st_bp->reserved_page_order);
3799 st_bp->cleared = 1;
3800}
3801
3802
3803/* Release the extra buffer */
3804static void normalize_buffer(struct st_buffer * STbuffer)
3805{
3806 int i, order = STbuffer->reserved_page_order;
3807
3808 for (i = 0; i < STbuffer->frp_segs; i++) {
3809 __free_pages(STbuffer->reserved_pages[i], order);
3810 STbuffer->buffer_size -= (PAGE_SIZE << order);
3811 }
3812 STbuffer->frp_segs = 0;
3813 STbuffer->sg_segs = 0;
3814 STbuffer->reserved_page_order = 0;
3815 STbuffer->map_data.offset = 0;
3816}
3817
3818
3819/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3820 negative error code. */
3821static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3822{
3823 int i, cnt, res, offset;
3824 int length = PAGE_SIZE << st_bp->reserved_page_order;
3825
3826 for (i = 0, offset = st_bp->buffer_bytes;
3827 i < st_bp->frp_segs && offset >= length; i++)
3828 offset -= length;
3829 if (i == st_bp->frp_segs) { /* Should never happen */
3830 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3831 return (-EIO);
3832 }
3833 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3834 struct page *page = st_bp->reserved_pages[i];
3835 cnt = length - offset < do_count ? length - offset : do_count;
3836 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3837 if (res)
3838 return (-EFAULT);
3839 do_count -= cnt;
3840 st_bp->buffer_bytes += cnt;
3841 ubp += cnt;
3842 offset = 0;
3843 }
3844 if (do_count) /* Should never happen */
3845 return (-EIO);
3846
3847 return 0;
3848}
3849
3850
3851/* Move data from the tape buffer to the user buffer. Returns zero (success) or
3852 negative error code. */
3853static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3854{
3855 int i, cnt, res, offset;
3856 int length = PAGE_SIZE << st_bp->reserved_page_order;
3857
3858 for (i = 0, offset = st_bp->read_pointer;
3859 i < st_bp->frp_segs && offset >= length; i++)
3860 offset -= length;
3861 if (i == st_bp->frp_segs) { /* Should never happen */
3862 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3863 return (-EIO);
3864 }
3865 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3866 struct page *page = st_bp->reserved_pages[i];
3867 cnt = length - offset < do_count ? length - offset : do_count;
3868 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3869 if (res)
3870 return (-EFAULT);
3871 do_count -= cnt;
3872 st_bp->buffer_bytes -= cnt;
3873 st_bp->read_pointer += cnt;
3874 ubp += cnt;
3875 offset = 0;
3876 }
3877 if (do_count) /* Should never happen */
3878 return (-EIO);
3879
3880 return 0;
3881}
3882
3883
3884/* Move data towards start of buffer */
3885static void move_buffer_data(struct st_buffer * st_bp, int offset)
3886{
3887 int src_seg, dst_seg, src_offset = 0, dst_offset;
3888 int count, total;
3889 int length = PAGE_SIZE << st_bp->reserved_page_order;
3890
3891 if (offset == 0)
3892 return;
3893
3894 total=st_bp->buffer_bytes - offset;
3895 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3896 src_offset = offset;
3897 if (src_offset < length)
3898 break;
3899 offset -= length;
3900 }
3901
3902 st_bp->buffer_bytes = st_bp->read_pointer = total;
3903 for (dst_seg=dst_offset=0; total > 0; ) {
3904 struct page *dpage = st_bp->reserved_pages[dst_seg];
3905 struct page *spage = st_bp->reserved_pages[src_seg];
3906
3907 count = min(length - dst_offset, length - src_offset);
3908 memmove(page_address(dpage) + dst_offset,
3909 page_address(spage) + src_offset, count);
3910 src_offset += count;
3911 if (src_offset >= length) {
3912 src_seg++;
3913 src_offset = 0;
3914 }
3915 dst_offset += count;
3916 if (dst_offset >= length) {
3917 dst_seg++;
3918 dst_offset = 0;
3919 }
3920 total -= count;
3921 }
3922}
3923
3924/* Validate the options from command line or module parameters */
3925static void validate_options(void)
3926{
3927 if (buffer_kbs > 0)
3928 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3929 if (max_sg_segs >= ST_FIRST_SG)
3930 st_max_sg_segs = max_sg_segs;
3931}
3932
3933#ifndef MODULE
3934/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3935 */
3936static int __init st_setup(char *str)
3937{
3938 int i, len, ints[5];
3939 char *stp;
3940
3941 stp = get_options(str, ARRAY_SIZE(ints), ints);
3942
3943 if (ints[0] > 0) {
3944 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3945 if (parms[i].val)
3946 *parms[i].val = ints[i + 1];
3947 } else {
3948 while (stp != NULL) {
3949 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3950 len = strlen(parms[i].name);
3951 if (!strncmp(stp, parms[i].name, len) &&
3952 (*(stp + len) == ':' || *(stp + len) == '=')) {
3953 if (parms[i].val)
3954 *parms[i].val =
3955 simple_strtoul(stp + len + 1, NULL, 0);
3956 else
3957 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3958 parms[i].name);
3959 break;
3960 }
3961 }
3962 if (i >= ARRAY_SIZE(parms))
3963 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3964 stp);
3965 stp = strchr(stp, ',');
3966 if (stp)
3967 stp++;
3968 }
3969 }
3970
3971 validate_options();
3972
3973 return 1;
3974}
3975
3976__setup("st=", st_setup);
3977
3978#endif
3979
3980static const struct file_operations st_fops =
3981{
3982 .owner = THIS_MODULE,
3983 .read = st_read,
3984 .write = st_write,
3985 .unlocked_ioctl = st_ioctl,
3986#ifdef CONFIG_COMPAT
3987 .compat_ioctl = st_compat_ioctl,
3988#endif
3989 .open = st_open,
3990 .flush = st_flush,
3991 .release = st_release,
3992 .llseek = noop_llseek,
3993};
3994
3995static int st_probe(struct device *dev)
3996{
3997 struct scsi_device *SDp = to_scsi_device(dev);
3998 struct gendisk *disk = NULL;
3999 struct cdev *cdev = NULL;
4000 struct scsi_tape *tpnt = NULL;
4001 struct st_modedef *STm;
4002 struct st_partstat *STps;
4003 struct st_buffer *buffer;
4004 int i, j, mode, dev_num, error;
4005 char *stp;
4006
4007 if (SDp->type != TYPE_TAPE)
4008 return -ENODEV;
4009 if ((stp = st_incompatible(SDp))) {
4010 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4011 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
4012 return -ENODEV;
4013 }
4014
4015 i = queue_max_segments(SDp->request_queue);
4016 if (st_max_sg_segs < i)
4017 i = st_max_sg_segs;
4018 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4019 if (buffer == NULL) {
4020 printk(KERN_ERR
4021 "st: Can't allocate new tape buffer. Device not attached.\n");
4022 goto out;
4023 }
4024
4025 disk = alloc_disk(1);
4026 if (!disk) {
4027 printk(KERN_ERR "st: out of memory. Device not attached.\n");
4028 goto out_buffer_free;
4029 }
4030
4031 write_lock(&st_dev_arr_lock);
4032 if (st_nr_dev >= st_dev_max) {
4033 struct scsi_tape **tmp_da;
4034 int tmp_dev_max;
4035
4036 tmp_dev_max = max(st_nr_dev * 2, 8);
4037 if (tmp_dev_max > ST_MAX_TAPES)
4038 tmp_dev_max = ST_MAX_TAPES;
4039 if (tmp_dev_max <= st_nr_dev) {
4040 write_unlock(&st_dev_arr_lock);
4041 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4042 ST_MAX_TAPES);
4043 goto out_put_disk;
4044 }
4045
4046 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
4047 if (tmp_da == NULL) {
4048 write_unlock(&st_dev_arr_lock);
4049 printk(KERN_ERR "st: Can't extend device array.\n");
4050 goto out_put_disk;
4051 }
4052
4053 if (scsi_tapes != NULL) {
4054 memcpy(tmp_da, scsi_tapes,
4055 st_dev_max * sizeof(struct scsi_tape *));
4056 kfree(scsi_tapes);
4057 }
4058 scsi_tapes = tmp_da;
4059
4060 st_dev_max = tmp_dev_max;
4061 }
4062
4063 for (i = 0; i < st_dev_max; i++)
4064 if (scsi_tapes[i] == NULL)
4065 break;
4066 if (i >= st_dev_max)
4067 panic("scsi_devices corrupt (st)");
4068
4069 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4070 if (tpnt == NULL) {
4071 write_unlock(&st_dev_arr_lock);
4072 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4073 goto out_put_disk;
4074 }
4075 kref_init(&tpnt->kref);
4076 tpnt->disk = disk;
4077 sprintf(disk->disk_name, "st%d", i);
4078 disk->private_data = &tpnt->driver;
4079 disk->queue = SDp->request_queue;
4080 tpnt->driver = &st_template;
4081 scsi_tapes[i] = tpnt;
4082 dev_num = i;
4083
4084 tpnt->device = SDp;
4085 if (SDp->scsi_level <= 2)
4086 tpnt->tape_type = MT_ISSCSI1;
4087 else
4088 tpnt->tape_type = MT_ISSCSI2;
4089
4090 tpnt->buffer = buffer;
4091 tpnt->buffer->last_SRpnt = NULL;
4092
4093 tpnt->inited = 0;
4094 tpnt->dirty = 0;
4095 tpnt->in_use = 0;
4096 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4097 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4098 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4099 tpnt->density = 0;
4100 tpnt->do_auto_lock = ST_AUTO_LOCK;
4101 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4102 tpnt->can_partitions = 0;
4103 tpnt->two_fm = ST_TWO_FM;
4104 tpnt->fast_mteom = ST_FAST_MTEOM;
4105 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4106 tpnt->sili = ST_SILI;
4107 tpnt->immediate = ST_NOWAIT;
4108 tpnt->immediate_filemark = 0;
4109 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4110 tpnt->partition = 0;
4111 tpnt->new_partition = 0;
4112 tpnt->nbr_partitions = 0;
4113 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4114 tpnt->long_timeout = ST_LONG_TIMEOUT;
4115 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4116
4117 for (i = 0; i < ST_NBR_MODES; i++) {
4118 STm = &(tpnt->modes[i]);
4119 STm->defined = 0;
4120 STm->sysv = ST_SYSV;
4121 STm->defaults_for_writes = 0;
4122 STm->do_async_writes = ST_ASYNC_WRITES;
4123 STm->do_buffer_writes = ST_BUFFER_WRITES;
4124 STm->do_read_ahead = ST_READ_AHEAD;
4125 STm->default_compression = ST_DONT_TOUCH;
4126 STm->default_blksize = (-1); /* No forced size */
4127 STm->default_density = (-1); /* No forced density */
4128 }
4129
4130 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4131 STps = &(tpnt->ps[i]);
4132 STps->rw = ST_IDLE;
4133 STps->eof = ST_NOEOF;
4134 STps->at_sm = 0;
4135 STps->last_block_valid = 0;
4136 STps->drv_block = (-1);
4137 STps->drv_file = (-1);
4138 }
4139
4140 tpnt->current_mode = 0;
4141 tpnt->modes[0].defined = 1;
4142
4143 tpnt->density_changed = tpnt->compression_changed =
4144 tpnt->blksize_changed = 0;
4145 mutex_init(&tpnt->lock);
4146
4147 st_nr_dev++;
4148 write_unlock(&st_dev_arr_lock);
4149
4150 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4151 STm = &(tpnt->modes[mode]);
4152 for (j=0; j < 2; j++) {
4153 cdev = cdev_alloc();
4154 if (!cdev) {
4155 printk(KERN_ERR
4156 "st%d: out of memory. Device not attached.\n",
4157 dev_num);
4158 goto out_free_tape;
4159 }
4160 cdev->owner = THIS_MODULE;
4161 cdev->ops = &st_fops;
4162
4163 error = cdev_add(cdev,
4164 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4165 1);
4166 if (error) {
4167 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4168 dev_num, j ? "non" : "auto", mode);
4169 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4170 goto out_free_tape;
4171 }
4172 STm->cdevs[j] = cdev;
4173
4174 }
4175 error = do_create_class_files(tpnt, dev_num, mode);
4176 if (error)
4177 goto out_free_tape;
4178 }
4179 scsi_autopm_put_device(SDp);
4180
4181 sdev_printk(KERN_NOTICE, SDp,
4182 "Attached scsi tape %s\n", tape_name(tpnt));
4183 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4184 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4185 queue_dma_alignment(SDp->request_queue) + 1);
4186
4187 return 0;
4188
4189out_free_tape:
4190 for (mode=0; mode < ST_NBR_MODES; mode++) {
4191 STm = &(tpnt->modes[mode]);
4192 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4193 "tape");
4194 for (j=0; j < 2; j++) {
4195 if (STm->cdevs[j]) {
4196 if (cdev == STm->cdevs[j])
4197 cdev = NULL;
4198 device_destroy(st_sysfs_class,
4199 MKDEV(SCSI_TAPE_MAJOR,
4200 TAPE_MINOR(i, mode, j)));
4201 cdev_del(STm->cdevs[j]);
4202 }
4203 }
4204 }
4205 if (cdev)
4206 cdev_del(cdev);
4207 write_lock(&st_dev_arr_lock);
4208 scsi_tapes[dev_num] = NULL;
4209 st_nr_dev--;
4210 write_unlock(&st_dev_arr_lock);
4211out_put_disk:
4212 put_disk(disk);
4213 kfree(tpnt);
4214out_buffer_free:
4215 kfree(buffer);
4216out:
4217 return -ENODEV;
4218};
4219
4220
4221static int st_remove(struct device *dev)
4222{
4223 struct scsi_device *SDp = to_scsi_device(dev);
4224 struct scsi_tape *tpnt;
4225 int i, j, mode;
4226
4227 scsi_autopm_get_device(SDp);
4228 write_lock(&st_dev_arr_lock);
4229 for (i = 0; i < st_dev_max; i++) {
4230 tpnt = scsi_tapes[i];
4231 if (tpnt != NULL && tpnt->device == SDp) {
4232 scsi_tapes[i] = NULL;
4233 st_nr_dev--;
4234 write_unlock(&st_dev_arr_lock);
4235 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4236 "tape");
4237 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4238 for (j=0; j < 2; j++) {
4239 device_destroy(st_sysfs_class,
4240 MKDEV(SCSI_TAPE_MAJOR,
4241 TAPE_MINOR(i, mode, j)));
4242 cdev_del(tpnt->modes[mode].cdevs[j]);
4243 tpnt->modes[mode].cdevs[j] = NULL;
4244 }
4245 }
4246
4247 mutex_lock(&st_ref_mutex);
4248 kref_put(&tpnt->kref, scsi_tape_release);
4249 mutex_unlock(&st_ref_mutex);
4250 return 0;
4251 }
4252 }
4253
4254 write_unlock(&st_dev_arr_lock);
4255 return 0;
4256}
4257
4258/**
4259 * scsi_tape_release - Called to free the Scsi_Tape structure
4260 * @kref: pointer to embedded kref
4261 *
4262 * st_ref_mutex must be held entering this routine. Because it is
4263 * called on last put, you should always use the scsi_tape_get()
4264 * scsi_tape_put() helpers which manipulate the semaphore directly
4265 * and never do a direct kref_put().
4266 **/
4267static void scsi_tape_release(struct kref *kref)
4268{
4269 struct scsi_tape *tpnt = to_scsi_tape(kref);
4270 struct gendisk *disk = tpnt->disk;
4271
4272 tpnt->device = NULL;
4273
4274 if (tpnt->buffer) {
4275 normalize_buffer(tpnt->buffer);
4276 kfree(tpnt->buffer->reserved_pages);
4277 kfree(tpnt->buffer);
4278 }
4279
4280 disk->private_data = NULL;
4281 put_disk(disk);
4282 kfree(tpnt);
4283 return;
4284}
4285
4286static int __init init_st(void)
4287{
4288 int err;
4289
4290 validate_options();
4291
4292 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4293 verstr, st_fixed_buffer_size, st_max_sg_segs);
4294
4295 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
4296 if (IS_ERR(st_sysfs_class)) {
4297 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
4298 return PTR_ERR(st_sysfs_class);
4299 }
4300
4301 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4302 ST_MAX_TAPE_ENTRIES, "st");
4303 if (err) {
4304 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4305 SCSI_TAPE_MAJOR);
4306 goto err_class;
4307 }
4308
4309 err = scsi_register_driver(&st_template.gendrv);
4310 if (err)
4311 goto err_chrdev;
4312
4313 err = do_create_sysfs_files();
4314 if (err)
4315 goto err_scsidrv;
4316
4317 return 0;
4318
4319err_scsidrv:
4320 scsi_unregister_driver(&st_template.gendrv);
4321err_chrdev:
4322 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4323 ST_MAX_TAPE_ENTRIES);
4324err_class:
4325 class_destroy(st_sysfs_class);
4326 return err;
4327}
4328
4329static void __exit exit_st(void)
4330{
4331 do_remove_sysfs_files();
4332 scsi_unregister_driver(&st_template.gendrv);
4333 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4334 ST_MAX_TAPE_ENTRIES);
4335 class_destroy(st_sysfs_class);
4336 kfree(scsi_tapes);
4337 printk(KERN_INFO "st: Unloaded.\n");
4338}
4339
4340module_init(init_st);
4341module_exit(exit_st);
4342
4343
4344/* The sysfs driver interface. Read-only at the moment */
4345static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4346{
4347 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4348}
4349static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4350
4351static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4352{
4353 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4354}
4355static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4356
4357static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4358{
4359 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4360}
4361static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4362
4363static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4364{
4365 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4366}
4367static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4368
4369static int do_create_sysfs_files(void)
4370{
4371 struct device_driver *sysfs = &st_template.gendrv;
4372 int err;
4373
4374 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4375 if (err)
4376 return err;
4377 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4378 if (err)
4379 goto err_try_direct_io;
4380 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4381 if (err)
4382 goto err_attr_fixed_buf;
4383 err = driver_create_file(sysfs, &driver_attr_version);
4384 if (err)
4385 goto err_attr_max_sg;
4386
4387 return 0;
4388
4389err_attr_max_sg:
4390 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4391err_attr_fixed_buf:
4392 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4393err_try_direct_io:
4394 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4395 return err;
4396}
4397
4398static void do_remove_sysfs_files(void)
4399{
4400 struct device_driver *sysfs = &st_template.gendrv;
4401
4402 driver_remove_file(sysfs, &driver_attr_version);
4403 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4404 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4405 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4406}
4407
4408
4409/* The sysfs simple class interface */
4410static ssize_t
4411st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4412{
4413 struct st_modedef *STm = dev_get_drvdata(dev);
4414 ssize_t l = 0;
4415
4416 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4417 return l;
4418}
4419
4420DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
4421
4422static ssize_t
4423st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
4424{
4425 struct st_modedef *STm = dev_get_drvdata(dev);
4426 ssize_t l = 0;
4427
4428 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4429 return l;
4430}
4431
4432DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
4433
4434static ssize_t
4435st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
4436{
4437 struct st_modedef *STm = dev_get_drvdata(dev);
4438 ssize_t l = 0;
4439 char *fmt;
4440
4441 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4442 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4443 return l;
4444}
4445
4446DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
4447
4448static ssize_t
4449st_defcompression_show(struct device *dev, struct device_attribute *attr,
4450 char *buf)
4451{
4452 struct st_modedef *STm = dev_get_drvdata(dev);
4453 ssize_t l = 0;
4454
4455 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4456 return l;
4457}
4458
4459DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
4460
4461static ssize_t
4462st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
4463{
4464 struct st_modedef *STm = dev_get_drvdata(dev);
4465 struct scsi_tape *STp;
4466 int i, j, options;
4467 ssize_t l = 0;
4468
4469 for (i=0; i < st_dev_max; i++) {
4470 for (j=0; j < ST_NBR_MODES; j++)
4471 if (&scsi_tapes[i]->modes[j] == STm)
4472 break;
4473 if (j < ST_NBR_MODES)
4474 break;
4475 }
4476 if (i == st_dev_max)
4477 return 0; /* should never happen */
4478
4479 STp = scsi_tapes[i];
4480
4481 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4482 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4483 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4484 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4485 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4486 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4487 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4488 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4489 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4490 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4491 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4492 options |= STm->sysv ? MT_ST_SYSV : 0;
4493 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4494 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4495 options |= STp->sili ? MT_ST_SILI : 0;
4496
4497 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4498 return l;
4499}
4500
4501DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
4502
4503static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
4504{
4505 int i, rew, error;
4506 char name[10];
4507 struct device *st_class_member;
4508
4509 for (rew=0; rew < 2; rew++) {
4510 /* Make sure that the minor numbers corresponding to the four
4511 first modes always get the same names */
4512 i = mode << (4 - ST_NBR_MODE_BITS);
4513 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4514 STp->disk->disk_name, st_formats[i]);
4515 st_class_member =
4516 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4517 MKDEV(SCSI_TAPE_MAJOR,
4518 TAPE_MINOR(dev_num, mode, rew)),
4519 &STp->modes[mode], "%s", name);
4520 if (IS_ERR(st_class_member)) {
4521 printk(KERN_WARNING "st%d: device_create failed\n",
4522 dev_num);
4523 error = PTR_ERR(st_class_member);
4524 goto out;
4525 }
4526
4527 error = device_create_file(st_class_member,
4528 &dev_attr_defined);
4529 if (error) goto out;
4530 error = device_create_file(st_class_member,
4531 &dev_attr_default_blksize);
4532 if (error) goto out;
4533 error = device_create_file(st_class_member,
4534 &dev_attr_default_density);
4535 if (error) goto out;
4536 error = device_create_file(st_class_member,
4537 &dev_attr_default_compression);
4538 if (error) goto out;
4539 error = device_create_file(st_class_member,
4540 &dev_attr_options);
4541 if (error) goto out;
4542
4543 if (mode == 0 && rew == 0) {
4544 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4545 &st_class_member->kobj,
4546 "tape");
4547 if (error) {
4548 printk(KERN_ERR
4549 "st%d: Can't create sysfs link from SCSI device.\n",
4550 dev_num);
4551 goto out;
4552 }
4553 }
4554 }
4555
4556 return 0;
4557
4558out:
4559 return error;
4560}
4561
4562/* The following functions may be useful for a larger audience. */
4563static int sgl_map_user_pages(struct st_buffer *STbp,
4564 const unsigned int max_pages, unsigned long uaddr,
4565 size_t count, int rw)
4566{
4567 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4568 unsigned long start = uaddr >> PAGE_SHIFT;
4569 const int nr_pages = end - start;
4570 int res, i, j;
4571 struct page **pages;
4572 struct rq_map_data *mdata = &STbp->map_data;
4573
4574 /* User attempted Overflow! */
4575 if ((uaddr + count) < uaddr)
4576 return -EINVAL;
4577
4578 /* Too big */
4579 if (nr_pages > max_pages)
4580 return -ENOMEM;
4581
4582 /* Hmm? */
4583 if (count == 0)
4584 return 0;
4585
4586 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4587 return -ENOMEM;
4588
4589 /* Try to fault in all of the necessary pages */
4590 down_read(¤t->mm->mmap_sem);
4591 /* rw==READ means read from drive, write into memory area */
4592 res = get_user_pages(
4593 current,
4594 current->mm,
4595 uaddr,
4596 nr_pages,
4597 rw == READ,
4598 0, /* don't force */
4599 pages,
4600 NULL);
4601 up_read(¤t->mm->mmap_sem);
4602
4603 /* Errors and no page mapped should return here */
4604 if (res < nr_pages)
4605 goto out_unmap;
4606
4607 for (i=0; i < nr_pages; i++) {
4608 /* FIXME: flush superflous for rw==READ,
4609 * probably wrong function for rw==WRITE
4610 */
4611 flush_dcache_page(pages[i]);
4612 }
4613
4614 mdata->offset = uaddr & ~PAGE_MASK;
4615 STbp->mapped_pages = pages;
4616
4617 return nr_pages;
4618 out_unmap:
4619 if (res > 0) {
4620 for (j=0; j < res; j++)
4621 page_cache_release(pages[j]);
4622 res = 0;
4623 }
4624 kfree(pages);
4625 return res;
4626}
4627
4628
4629/* And unmap them... */
4630static int sgl_unmap_user_pages(struct st_buffer *STbp,
4631 const unsigned int nr_pages, int dirtied)
4632{
4633 int i;
4634
4635 for (i=0; i < nr_pages; i++) {
4636 struct page *page = STbp->mapped_pages[i];
4637
4638 if (dirtied)
4639 SetPageDirty(page);
4640 /* FIXME: cache flush missing for rw==READ
4641 * FIXME: call the correct reference counting function
4642 */
4643 page_cache_release(page);
4644 }
4645 kfree(STbp->mapped_pages);
4646 STbp->mapped_pages = NULL;
4647
4648 return 0;
4649}