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1/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
12 Copyright 1992 - 2010 Kai Makisara
13 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
20static const char *verstr = "20101219";
21
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/mm.h>
28#include <linux/init.h>
29#include <linux/string.h>
30#include <linux/slab.h>
31#include <linux/errno.h>
32#include <linux/mtio.h>
33#include <linux/cdrom.h>
34#include <linux/ioctl.h>
35#include <linux/fcntl.h>
36#include <linux/spinlock.h>
37#include <linux/blkdev.h>
38#include <linux/moduleparam.h>
39#include <linux/cdev.h>
40#include <linux/delay.h>
41#include <linux/mutex.h>
42
43#include <asm/uaccess.h>
44#include <asm/dma.h>
45#include <asm/system.h>
46
47#include <scsi/scsi.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/scsi_device.h>
50#include <scsi/scsi_driver.h>
51#include <scsi/scsi_eh.h>
52#include <scsi/scsi_host.h>
53#include <scsi/scsi_ioctl.h>
54#include <scsi/sg.h>
55
56
57/* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59#define DEBUG 0
60
61#if DEBUG
62/* The message level for the debug messages is currently set to KERN_NOTICE
63 so that people can easily see the messages. Later when the debugging messages
64 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
65#define ST_DEB_MSG KERN_NOTICE
66#define DEB(a) a
67#define DEBC(a) if (debugging) { a ; }
68#else
69#define DEB(a)
70#define DEBC(a)
71#endif
72
73#define ST_KILOBYTE 1024
74
75#include "st_options.h"
76#include "st.h"
77
78static DEFINE_MUTEX(st_mutex);
79static int buffer_kbs;
80static int max_sg_segs;
81static int try_direct_io = TRY_DIRECT_IO;
82static int try_rdio = 1;
83static int try_wdio = 1;
84
85static int st_dev_max;
86static int st_nr_dev;
87
88static struct class *st_sysfs_class;
89
90MODULE_AUTHOR("Kai Makisara");
91MODULE_DESCRIPTION("SCSI tape (st) driver");
92MODULE_LICENSE("GPL");
93MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
95
96/* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100module_param_named(buffer_kbs, buffer_kbs, int, 0);
101MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102module_param_named(max_sg_segs, max_sg_segs, int, 0);
103MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104module_param_named(try_direct_io, try_direct_io, int, 0);
105MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106
107/* Extra parameters for testing */
108module_param_named(try_rdio, try_rdio, int, 0);
109MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
110module_param_named(try_wdio, try_wdio, int, 0);
111MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
112
113#ifndef MODULE
114static int write_threshold_kbs; /* retained for compatibility */
115static struct st_dev_parm {
116 char *name;
117 int *val;
118} parms[] __initdata = {
119 {
120 "buffer_kbs", &buffer_kbs
121 },
122 { /* Retained for compatibility with 2.4 */
123 "write_threshold_kbs", &write_threshold_kbs
124 },
125 {
126 "max_sg_segs", NULL
127 },
128 {
129 "try_direct_io", &try_direct_io
130 }
131};
132#endif
133
134/* Restrict the number of modes so that names for all are assigned */
135#if ST_NBR_MODES > 16
136#error "Maximum number of modes is 16"
137#endif
138/* Bit reversed order to get same names for same minors with all
139 mode counts */
140static const char *st_formats[] = {
141 "", "r", "k", "s", "l", "t", "o", "u",
142 "m", "v", "p", "x", "a", "y", "q", "z"};
143
144/* The default definitions have been moved to st_options.h */
145
146#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
147
148/* The buffer size should fit into the 24 bits for length in the
149 6-byte SCSI read and write commands. */
150#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
151#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
152#endif
153
154static int debugging = DEBUG;
155
156#define MAX_RETRIES 0
157#define MAX_WRITE_RETRIES 0
158#define MAX_READY_RETRIES 0
159#define NO_TAPE NOT_READY
160
161#define ST_TIMEOUT (900 * HZ)
162#define ST_LONG_TIMEOUT (14000 * HZ)
163
164/* Remove mode bits and auto-rewind bit (7) */
165#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
166 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
167#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
168
169/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
170#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
171 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
172
173/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
174 24 bits) */
175#define SET_DENS_AND_BLK 0x10001
176
177static DEFINE_RWLOCK(st_dev_arr_lock);
178
179static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
180static int st_max_sg_segs = ST_MAX_SG;
181
182static struct scsi_tape **scsi_tapes = NULL;
183
184static int modes_defined;
185
186static int enlarge_buffer(struct st_buffer *, int, int);
187static void clear_buffer(struct st_buffer *);
188static void normalize_buffer(struct st_buffer *);
189static int append_to_buffer(const char __user *, struct st_buffer *, int);
190static int from_buffer(struct st_buffer *, char __user *, int);
191static void move_buffer_data(struct st_buffer *, int);
192
193static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
194 unsigned long, size_t, int);
195static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
196
197static int st_probe(struct device *);
198static int st_remove(struct device *);
199
200static int do_create_sysfs_files(void);
201static void do_remove_sysfs_files(void);
202static int do_create_class_files(struct scsi_tape *, int, int);
203
204static struct scsi_driver st_template = {
205 .owner = THIS_MODULE,
206 .gendrv = {
207 .name = "st",
208 .probe = st_probe,
209 .remove = st_remove,
210 },
211};
212
213static int st_compression(struct scsi_tape *, int);
214
215static int find_partition(struct scsi_tape *);
216static int switch_partition(struct scsi_tape *);
217
218static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
219
220static void scsi_tape_release(struct kref *);
221
222#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
223
224static DEFINE_MUTEX(st_ref_mutex);
225
226
227#include "osst_detect.h"
228#ifndef SIGS_FROM_OSST
229#define SIGS_FROM_OSST \
230 {"OnStream", "SC-", "", "osst"}, \
231 {"OnStream", "DI-", "", "osst"}, \
232 {"OnStream", "DP-", "", "osst"}, \
233 {"OnStream", "USB", "", "osst"}, \
234 {"OnStream", "FW-", "", "osst"}
235#endif
236
237static struct scsi_tape *scsi_tape_get(int dev)
238{
239 struct scsi_tape *STp = NULL;
240
241 mutex_lock(&st_ref_mutex);
242 write_lock(&st_dev_arr_lock);
243
244 if (dev < st_dev_max && scsi_tapes != NULL)
245 STp = scsi_tapes[dev];
246 if (!STp) goto out;
247
248 kref_get(&STp->kref);
249
250 if (!STp->device)
251 goto out_put;
252
253 if (scsi_device_get(STp->device))
254 goto out_put;
255
256 goto out;
257
258out_put:
259 kref_put(&STp->kref, scsi_tape_release);
260 STp = NULL;
261out:
262 write_unlock(&st_dev_arr_lock);
263 mutex_unlock(&st_ref_mutex);
264 return STp;
265}
266
267static void scsi_tape_put(struct scsi_tape *STp)
268{
269 struct scsi_device *sdev = STp->device;
270
271 mutex_lock(&st_ref_mutex);
272 kref_put(&STp->kref, scsi_tape_release);
273 scsi_device_put(sdev);
274 mutex_unlock(&st_ref_mutex);
275}
276
277struct st_reject_data {
278 char *vendor;
279 char *model;
280 char *rev;
281 char *driver_hint; /* Name of the correct driver, NULL if unknown */
282};
283
284static struct st_reject_data reject_list[] = {
285 /* {"XXX", "Yy-", "", NULL}, example */
286 SIGS_FROM_OSST,
287 {NULL, }};
288
289/* If the device signature is on the list of incompatible drives, the
290 function returns a pointer to the name of the correct driver (if known) */
291static char * st_incompatible(struct scsi_device* SDp)
292{
293 struct st_reject_data *rp;
294
295 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
296 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
297 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
298 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
299 if (rp->driver_hint)
300 return rp->driver_hint;
301 else
302 return "unknown";
303 }
304 return NULL;
305}
306
307
308static inline char *tape_name(struct scsi_tape *tape)
309{
310 return tape->disk->disk_name;
311}
312
313
314static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
315{
316 const u8 *ucp;
317 const u8 *sense = SRpnt->sense;
318
319 s->have_sense = scsi_normalize_sense(SRpnt->sense,
320 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
321 s->flags = 0;
322
323 if (s->have_sense) {
324 s->deferred = 0;
325 s->remainder_valid =
326 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
327 switch (sense[0] & 0x7f) {
328 case 0x71:
329 s->deferred = 1;
330 case 0x70:
331 s->fixed_format = 1;
332 s->flags = sense[2] & 0xe0;
333 break;
334 case 0x73:
335 s->deferred = 1;
336 case 0x72:
337 s->fixed_format = 0;
338 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
339 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
340 break;
341 }
342 }
343}
344
345
346/* Convert the result to success code */
347static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
348{
349 int result = SRpnt->result;
350 u8 scode;
351 DEB(const char *stp;)
352 char *name = tape_name(STp);
353 struct st_cmdstatus *cmdstatp;
354
355 if (!result)
356 return 0;
357
358 cmdstatp = &STp->buffer->cmdstat;
359 st_analyze_sense(SRpnt, cmdstatp);
360
361 if (cmdstatp->have_sense)
362 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
363 else
364 scode = 0;
365
366 DEB(
367 if (debugging) {
368 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
369 name, result,
370 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
371 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
372 if (cmdstatp->have_sense)
373 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
374 } ) /* end DEB */
375 if (!debugging) { /* Abnormal conditions for tape */
376 if (!cmdstatp->have_sense)
377 printk(KERN_WARNING
378 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
379 name, result, driver_byte(result),
380 host_byte(result));
381 else if (cmdstatp->have_sense &&
382 scode != NO_SENSE &&
383 scode != RECOVERED_ERROR &&
384 /* scode != UNIT_ATTENTION && */
385 scode != BLANK_CHECK &&
386 scode != VOLUME_OVERFLOW &&
387 SRpnt->cmd[0] != MODE_SENSE &&
388 SRpnt->cmd[0] != TEST_UNIT_READY) {
389
390 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
391 }
392 }
393
394 if (cmdstatp->fixed_format &&
395 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
396 if (STp->cln_sense_value)
397 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
398 STp->cln_sense_mask) == STp->cln_sense_value);
399 else
400 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
401 STp->cln_sense_mask) != 0);
402 }
403 if (cmdstatp->have_sense &&
404 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
405 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
406
407 STp->pos_unknown |= STp->device->was_reset;
408
409 if (cmdstatp->have_sense &&
410 scode == RECOVERED_ERROR
411#if ST_RECOVERED_WRITE_FATAL
412 && SRpnt->cmd[0] != WRITE_6
413 && SRpnt->cmd[0] != WRITE_FILEMARKS
414#endif
415 ) {
416 STp->recover_count++;
417 STp->recover_reg++;
418
419 DEB(
420 if (debugging) {
421 if (SRpnt->cmd[0] == READ_6)
422 stp = "read";
423 else if (SRpnt->cmd[0] == WRITE_6)
424 stp = "write";
425 else
426 stp = "ioctl";
427 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp,
428 STp->recover_count);
429 } ) /* end DEB */
430
431 if (cmdstatp->flags == 0)
432 return 0;
433 }
434 return (-EIO);
435}
436
437static struct st_request *st_allocate_request(struct scsi_tape *stp)
438{
439 struct st_request *streq;
440
441 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
442 if (streq)
443 streq->stp = stp;
444 else {
445 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
446 tape_name(stp)););
447 if (signal_pending(current))
448 stp->buffer->syscall_result = -EINTR;
449 else
450 stp->buffer->syscall_result = -EBUSY;
451 }
452
453 return streq;
454}
455
456static void st_release_request(struct st_request *streq)
457{
458 kfree(streq);
459}
460
461static void st_scsi_execute_end(struct request *req, int uptodate)
462{
463 struct st_request *SRpnt = req->end_io_data;
464 struct scsi_tape *STp = SRpnt->stp;
465
466 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
467 STp->buffer->cmdstat.residual = req->resid_len;
468
469 if (SRpnt->waiting)
470 complete(SRpnt->waiting);
471
472 blk_rq_unmap_user(SRpnt->bio);
473 __blk_put_request(req->q, req);
474}
475
476static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
477 int data_direction, void *buffer, unsigned bufflen,
478 int timeout, int retries)
479{
480 struct request *req;
481 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
482 int err = 0;
483 int write = (data_direction == DMA_TO_DEVICE);
484
485 req = blk_get_request(SRpnt->stp->device->request_queue, write,
486 GFP_KERNEL);
487 if (!req)
488 return DRIVER_ERROR << 24;
489
490 req->cmd_type = REQ_TYPE_BLOCK_PC;
491 req->cmd_flags |= REQ_QUIET;
492
493 mdata->null_mapped = 1;
494
495 if (bufflen) {
496 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
497 GFP_KERNEL);
498 if (err) {
499 blk_put_request(req);
500 return DRIVER_ERROR << 24;
501 }
502 }
503
504 SRpnt->bio = req->bio;
505 req->cmd_len = COMMAND_SIZE(cmd[0]);
506 memset(req->cmd, 0, BLK_MAX_CDB);
507 memcpy(req->cmd, cmd, req->cmd_len);
508 req->sense = SRpnt->sense;
509 req->sense_len = 0;
510 req->timeout = timeout;
511 req->retries = retries;
512 req->end_io_data = SRpnt;
513
514 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
515 return 0;
516}
517
518/* Do the scsi command. Waits until command performed if do_wait is true.
519 Otherwise write_behind_check() is used to check that the command
520 has finished. */
521static struct st_request *
522st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
523 int bytes, int direction, int timeout, int retries, int do_wait)
524{
525 struct completion *waiting;
526 struct rq_map_data *mdata = &STp->buffer->map_data;
527 int ret;
528
529 /* if async, make sure there's no command outstanding */
530 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
531 printk(KERN_ERR "%s: Async command already active.\n",
532 tape_name(STp));
533 if (signal_pending(current))
534 (STp->buffer)->syscall_result = (-EINTR);
535 else
536 (STp->buffer)->syscall_result = (-EBUSY);
537 return NULL;
538 }
539
540 if (!SRpnt) {
541 SRpnt = st_allocate_request(STp);
542 if (!SRpnt)
543 return NULL;
544 }
545
546 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
547 which IO is outstanding. It's nulled out when the IO completes. */
548 if (!do_wait)
549 (STp->buffer)->last_SRpnt = SRpnt;
550
551 waiting = &STp->wait;
552 init_completion(waiting);
553 SRpnt->waiting = waiting;
554
555 if (STp->buffer->do_dio) {
556 mdata->page_order = 0;
557 mdata->nr_entries = STp->buffer->sg_segs;
558 mdata->pages = STp->buffer->mapped_pages;
559 } else {
560 mdata->page_order = STp->buffer->reserved_page_order;
561 mdata->nr_entries =
562 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
563 mdata->pages = STp->buffer->reserved_pages;
564 mdata->offset = 0;
565 }
566
567 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
568 STp->buffer->cmdstat.have_sense = 0;
569 STp->buffer->syscall_result = 0;
570
571 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
572 retries);
573 if (ret) {
574 /* could not allocate the buffer or request was too large */
575 (STp->buffer)->syscall_result = (-EBUSY);
576 (STp->buffer)->last_SRpnt = NULL;
577 } else if (do_wait) {
578 wait_for_completion(waiting);
579 SRpnt->waiting = NULL;
580 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
581 }
582
583 return SRpnt;
584}
585
586
587/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
588 write has been correct but EOM early warning reached, -EIO if write ended in
589 error or zero if write successful. Asynchronous writes are used only in
590 variable block mode. */
591static int write_behind_check(struct scsi_tape * STp)
592{
593 int retval = 0;
594 struct st_buffer *STbuffer;
595 struct st_partstat *STps;
596 struct st_cmdstatus *cmdstatp;
597 struct st_request *SRpnt;
598
599 STbuffer = STp->buffer;
600 if (!STbuffer->writing)
601 return 0;
602
603 DEB(
604 if (STp->write_pending)
605 STp->nbr_waits++;
606 else
607 STp->nbr_finished++;
608 ) /* end DEB */
609
610 wait_for_completion(&(STp->wait));
611 SRpnt = STbuffer->last_SRpnt;
612 STbuffer->last_SRpnt = NULL;
613 SRpnt->waiting = NULL;
614
615 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
616 st_release_request(SRpnt);
617
618 STbuffer->buffer_bytes -= STbuffer->writing;
619 STps = &(STp->ps[STp->partition]);
620 if (STps->drv_block >= 0) {
621 if (STp->block_size == 0)
622 STps->drv_block++;
623 else
624 STps->drv_block += STbuffer->writing / STp->block_size;
625 }
626
627 cmdstatp = &STbuffer->cmdstat;
628 if (STbuffer->syscall_result) {
629 retval = -EIO;
630 if (cmdstatp->have_sense && !cmdstatp->deferred &&
631 (cmdstatp->flags & SENSE_EOM) &&
632 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
633 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
634 /* EOM at write-behind, has all data been written? */
635 if (!cmdstatp->remainder_valid ||
636 cmdstatp->uremainder64 == 0)
637 retval = -ENOSPC;
638 }
639 if (retval == -EIO)
640 STps->drv_block = -1;
641 }
642 STbuffer->writing = 0;
643
644 DEB(if (debugging && retval)
645 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n",
646 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
647
648 return retval;
649}
650
651
652/* Step over EOF if it has been inadvertently crossed (ioctl not used because
653 it messes up the block number). */
654static int cross_eof(struct scsi_tape * STp, int forward)
655{
656 struct st_request *SRpnt;
657 unsigned char cmd[MAX_COMMAND_SIZE];
658
659 cmd[0] = SPACE;
660 cmd[1] = 0x01; /* Space FileMarks */
661 if (forward) {
662 cmd[2] = cmd[3] = 0;
663 cmd[4] = 1;
664 } else
665 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
666 cmd[5] = 0;
667
668 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
669 tape_name(STp), forward ? "forward" : "backward"));
670
671 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
672 STp->device->request_queue->rq_timeout,
673 MAX_RETRIES, 1);
674 if (!SRpnt)
675 return (STp->buffer)->syscall_result;
676
677 st_release_request(SRpnt);
678 SRpnt = NULL;
679
680 if ((STp->buffer)->cmdstat.midlevel_result != 0)
681 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
682 tape_name(STp), forward ? "forward" : "backward");
683
684 return (STp->buffer)->syscall_result;
685}
686
687
688/* Flush the write buffer (never need to write if variable blocksize). */
689static int st_flush_write_buffer(struct scsi_tape * STp)
690{
691 int transfer, blks;
692 int result;
693 unsigned char cmd[MAX_COMMAND_SIZE];
694 struct st_request *SRpnt;
695 struct st_partstat *STps;
696
697 result = write_behind_check(STp);
698 if (result)
699 return result;
700
701 result = 0;
702 if (STp->dirty == 1) {
703
704 transfer = STp->buffer->buffer_bytes;
705 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
706 tape_name(STp), transfer));
707
708 memset(cmd, 0, MAX_COMMAND_SIZE);
709 cmd[0] = WRITE_6;
710 cmd[1] = 1;
711 blks = transfer / STp->block_size;
712 cmd[2] = blks >> 16;
713 cmd[3] = blks >> 8;
714 cmd[4] = blks;
715
716 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
717 STp->device->request_queue->rq_timeout,
718 MAX_WRITE_RETRIES, 1);
719 if (!SRpnt)
720 return (STp->buffer)->syscall_result;
721
722 STps = &(STp->ps[STp->partition]);
723 if ((STp->buffer)->syscall_result != 0) {
724 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
725
726 if (cmdstatp->have_sense && !cmdstatp->deferred &&
727 (cmdstatp->flags & SENSE_EOM) &&
728 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
729 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
730 (!cmdstatp->remainder_valid ||
731 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
732 STp->dirty = 0;
733 (STp->buffer)->buffer_bytes = 0;
734 if (STps->drv_block >= 0)
735 STps->drv_block += blks;
736 result = (-ENOSPC);
737 } else {
738 printk(KERN_ERR "%s: Error on flush.\n",
739 tape_name(STp));
740 STps->drv_block = (-1);
741 result = (-EIO);
742 }
743 } else {
744 if (STps->drv_block >= 0)
745 STps->drv_block += blks;
746 STp->dirty = 0;
747 (STp->buffer)->buffer_bytes = 0;
748 }
749 st_release_request(SRpnt);
750 SRpnt = NULL;
751 }
752 return result;
753}
754
755
756/* Flush the tape buffer. The tape will be positioned correctly unless
757 seek_next is true. */
758static int flush_buffer(struct scsi_tape *STp, int seek_next)
759{
760 int backspace, result;
761 struct st_buffer *STbuffer;
762 struct st_partstat *STps;
763
764 STbuffer = STp->buffer;
765
766 /*
767 * If there was a bus reset, block further access
768 * to this device.
769 */
770 if (STp->pos_unknown)
771 return (-EIO);
772
773 if (STp->ready != ST_READY)
774 return 0;
775 STps = &(STp->ps[STp->partition]);
776 if (STps->rw == ST_WRITING) /* Writing */
777 return st_flush_write_buffer(STp);
778
779 if (STp->block_size == 0)
780 return 0;
781
782 backspace = ((STp->buffer)->buffer_bytes +
783 (STp->buffer)->read_pointer) / STp->block_size -
784 ((STp->buffer)->read_pointer + STp->block_size - 1) /
785 STp->block_size;
786 (STp->buffer)->buffer_bytes = 0;
787 (STp->buffer)->read_pointer = 0;
788 result = 0;
789 if (!seek_next) {
790 if (STps->eof == ST_FM_HIT) {
791 result = cross_eof(STp, 0); /* Back over the EOF hit */
792 if (!result)
793 STps->eof = ST_NOEOF;
794 else {
795 if (STps->drv_file >= 0)
796 STps->drv_file++;
797 STps->drv_block = 0;
798 }
799 }
800 if (!result && backspace > 0)
801 result = st_int_ioctl(STp, MTBSR, backspace);
802 } else if (STps->eof == ST_FM_HIT) {
803 if (STps->drv_file >= 0)
804 STps->drv_file++;
805 STps->drv_block = 0;
806 STps->eof = ST_NOEOF;
807 }
808 return result;
809
810}
811
812/* Set the mode parameters */
813static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
814{
815 int set_it = 0;
816 unsigned long arg;
817 char *name = tape_name(STp);
818
819 if (!STp->density_changed &&
820 STm->default_density >= 0 &&
821 STm->default_density != STp->density) {
822 arg = STm->default_density;
823 set_it = 1;
824 } else
825 arg = STp->density;
826 arg <<= MT_ST_DENSITY_SHIFT;
827 if (!STp->blksize_changed &&
828 STm->default_blksize >= 0 &&
829 STm->default_blksize != STp->block_size) {
830 arg |= STm->default_blksize;
831 set_it = 1;
832 } else
833 arg |= STp->block_size;
834 if (set_it &&
835 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
836 printk(KERN_WARNING
837 "%s: Can't set default block size to %d bytes and density %x.\n",
838 name, STm->default_blksize, STm->default_density);
839 if (modes_defined)
840 return (-EINVAL);
841 }
842 return 0;
843}
844
845
846/* Lock or unlock the drive door. Don't use when st_request allocated. */
847static int do_door_lock(struct scsi_tape * STp, int do_lock)
848{
849 int retval, cmd;
850 DEB(char *name = tape_name(STp);)
851
852
853 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK;
854 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name,
855 do_lock ? "L" : "Unl"));
856 retval = scsi_ioctl(STp->device, cmd, NULL);
857 if (!retval) {
858 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
859 }
860 else {
861 STp->door_locked = ST_LOCK_FAILS;
862 }
863 return retval;
864}
865
866
867/* Set the internal state after reset */
868static void reset_state(struct scsi_tape *STp)
869{
870 int i;
871 struct st_partstat *STps;
872
873 STp->pos_unknown = 0;
874 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
875 STps = &(STp->ps[i]);
876 STps->rw = ST_IDLE;
877 STps->eof = ST_NOEOF;
878 STps->at_sm = 0;
879 STps->last_block_valid = 0;
880 STps->drv_block = -1;
881 STps->drv_file = -1;
882 }
883 if (STp->can_partitions) {
884 STp->partition = find_partition(STp);
885 if (STp->partition < 0)
886 STp->partition = 0;
887 STp->new_partition = STp->partition;
888 }
889}
890
891/* Test if the drive is ready. Returns either one of the codes below or a negative system
892 error code. */
893#define CHKRES_READY 0
894#define CHKRES_NEW_SESSION 1
895#define CHKRES_NOT_READY 2
896#define CHKRES_NO_TAPE 3
897
898#define MAX_ATTENTIONS 10
899
900static int test_ready(struct scsi_tape *STp, int do_wait)
901{
902 int attentions, waits, max_wait, scode;
903 int retval = CHKRES_READY, new_session = 0;
904 unsigned char cmd[MAX_COMMAND_SIZE];
905 struct st_request *SRpnt = NULL;
906 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
907
908 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
909
910 for (attentions=waits=0; ; ) {
911 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
912 cmd[0] = TEST_UNIT_READY;
913 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
914 STp->long_timeout, MAX_READY_RETRIES, 1);
915
916 if (!SRpnt) {
917 retval = (STp->buffer)->syscall_result;
918 break;
919 }
920
921 if (cmdstatp->have_sense) {
922
923 scode = cmdstatp->sense_hdr.sense_key;
924
925 if (scode == UNIT_ATTENTION) { /* New media? */
926 new_session = 1;
927 if (attentions < MAX_ATTENTIONS) {
928 attentions++;
929 continue;
930 }
931 else {
932 retval = (-EIO);
933 break;
934 }
935 }
936
937 if (scode == NOT_READY) {
938 if (waits < max_wait) {
939 if (msleep_interruptible(1000)) {
940 retval = (-EINTR);
941 break;
942 }
943 waits++;
944 continue;
945 }
946 else {
947 if ((STp->device)->scsi_level >= SCSI_2 &&
948 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
949 retval = CHKRES_NO_TAPE;
950 else
951 retval = CHKRES_NOT_READY;
952 break;
953 }
954 }
955 }
956
957 retval = (STp->buffer)->syscall_result;
958 if (!retval)
959 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
960 break;
961 }
962
963 if (SRpnt != NULL)
964 st_release_request(SRpnt);
965 return retval;
966}
967
968
969/* See if the drive is ready and gather information about the tape. Return values:
970 < 0 negative error code from errno.h
971 0 drive ready
972 1 drive not ready (possibly no tape)
973*/
974static int check_tape(struct scsi_tape *STp, struct file *filp)
975{
976 int i, retval, new_session = 0, do_wait;
977 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
978 unsigned short st_flags = filp->f_flags;
979 struct st_request *SRpnt = NULL;
980 struct st_modedef *STm;
981 struct st_partstat *STps;
982 char *name = tape_name(STp);
983 struct inode *inode = filp->f_path.dentry->d_inode;
984 int mode = TAPE_MODE(inode);
985
986 STp->ready = ST_READY;
987
988 if (mode != STp->current_mode) {
989 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n",
990 name, STp->current_mode, mode));
991 new_session = 1;
992 STp->current_mode = mode;
993 }
994 STm = &(STp->modes[STp->current_mode]);
995
996 saved_cleaning = STp->cleaning_req;
997 STp->cleaning_req = 0;
998
999 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1000 retval = test_ready(STp, do_wait);
1001
1002 if (retval < 0)
1003 goto err_out;
1004
1005 if (retval == CHKRES_NEW_SESSION) {
1006 STp->pos_unknown = 0;
1007 STp->partition = STp->new_partition = 0;
1008 if (STp->can_partitions)
1009 STp->nbr_partitions = 1; /* This guess will be updated later
1010 if necessary */
1011 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1012 STps = &(STp->ps[i]);
1013 STps->rw = ST_IDLE;
1014 STps->eof = ST_NOEOF;
1015 STps->at_sm = 0;
1016 STps->last_block_valid = 0;
1017 STps->drv_block = 0;
1018 STps->drv_file = 0;
1019 }
1020 new_session = 1;
1021 }
1022 else {
1023 STp->cleaning_req |= saved_cleaning;
1024
1025 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1026 if (retval == CHKRES_NO_TAPE)
1027 STp->ready = ST_NO_TAPE;
1028 else
1029 STp->ready = ST_NOT_READY;
1030
1031 STp->density = 0; /* Clear the erroneous "residue" */
1032 STp->write_prot = 0;
1033 STp->block_size = 0;
1034 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1035 STp->partition = STp->new_partition = 0;
1036 STp->door_locked = ST_UNLOCKED;
1037 return CHKRES_NOT_READY;
1038 }
1039 }
1040
1041 if (STp->omit_blklims)
1042 STp->min_block = STp->max_block = (-1);
1043 else {
1044 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1045 cmd[0] = READ_BLOCK_LIMITS;
1046
1047 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1048 STp->device->request_queue->rq_timeout,
1049 MAX_READY_RETRIES, 1);
1050 if (!SRpnt) {
1051 retval = (STp->buffer)->syscall_result;
1052 goto err_out;
1053 }
1054
1055 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1056 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1057 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1058 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1059 (STp->buffer)->b_data[5];
1060 if ( DEB( debugging || ) !STp->inited)
1061 printk(KERN_INFO
1062 "%s: Block limits %d - %d bytes.\n", name,
1063 STp->min_block, STp->max_block);
1064 } else {
1065 STp->min_block = STp->max_block = (-1);
1066 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n",
1067 name));
1068 }
1069 }
1070
1071 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1072 cmd[0] = MODE_SENSE;
1073 cmd[4] = 12;
1074
1075 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1076 STp->device->request_queue->rq_timeout,
1077 MAX_READY_RETRIES, 1);
1078 if (!SRpnt) {
1079 retval = (STp->buffer)->syscall_result;
1080 goto err_out;
1081 }
1082
1083 if ((STp->buffer)->syscall_result != 0) {
1084 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name));
1085 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1086 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1087 STp->drv_write_prot = 0;
1088 } else {
1089 DEBC(printk(ST_DEB_MSG
1090 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n",
1091 name,
1092 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1],
1093 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]));
1094
1095 if ((STp->buffer)->b_data[3] >= 8) {
1096 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1097 STp->density = (STp->buffer)->b_data[4];
1098 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1099 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1100 DEBC(printk(ST_DEB_MSG
1101 "%s: Density %x, tape length: %x, drv buffer: %d\n",
1102 name, STp->density, (STp->buffer)->b_data[5] * 65536 +
1103 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7],
1104 STp->drv_buffer));
1105 }
1106 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1107 }
1108 st_release_request(SRpnt);
1109 SRpnt = NULL;
1110 STp->inited = 1;
1111
1112 if (STp->block_size > 0)
1113 (STp->buffer)->buffer_blocks =
1114 (STp->buffer)->buffer_size / STp->block_size;
1115 else
1116 (STp->buffer)->buffer_blocks = 1;
1117 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1118
1119 DEBC(printk(ST_DEB_MSG
1120 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name,
1121 STp->block_size, (STp->buffer)->buffer_size,
1122 (STp->buffer)->buffer_blocks));
1123
1124 if (STp->drv_write_prot) {
1125 STp->write_prot = 1;
1126
1127 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name));
1128
1129 if (do_wait &&
1130 ((st_flags & O_ACCMODE) == O_WRONLY ||
1131 (st_flags & O_ACCMODE) == O_RDWR)) {
1132 retval = (-EROFS);
1133 goto err_out;
1134 }
1135 }
1136
1137 if (STp->can_partitions && STp->nbr_partitions < 1) {
1138 /* This code is reached when the device is opened for the first time
1139 after the driver has been initialized with tape in the drive and the
1140 partition support has been enabled. */
1141 DEBC(printk(ST_DEB_MSG
1142 "%s: Updating partition number in status.\n", name));
1143 if ((STp->partition = find_partition(STp)) < 0) {
1144 retval = STp->partition;
1145 goto err_out;
1146 }
1147 STp->new_partition = STp->partition;
1148 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1149 }
1150
1151 if (new_session) { /* Change the drive parameters for the new mode */
1152 STp->density_changed = STp->blksize_changed = 0;
1153 STp->compression_changed = 0;
1154 if (!(STm->defaults_for_writes) &&
1155 (retval = set_mode_densblk(STp, STm)) < 0)
1156 goto err_out;
1157
1158 if (STp->default_drvbuffer != 0xff) {
1159 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1160 printk(KERN_WARNING
1161 "%s: Can't set default drive buffering to %d.\n",
1162 name, STp->default_drvbuffer);
1163 }
1164 }
1165
1166 return CHKRES_READY;
1167
1168 err_out:
1169 return retval;
1170}
1171
1172
1173 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1174 module count. */
1175static int st_open(struct inode *inode, struct file *filp)
1176{
1177 int i, retval = (-EIO);
1178 struct scsi_tape *STp;
1179 struct st_partstat *STps;
1180 int dev = TAPE_NR(inode);
1181 char *name;
1182
1183 mutex_lock(&st_mutex);
1184 /*
1185 * We really want to do nonseekable_open(inode, filp); here, but some
1186 * versions of tar incorrectly call lseek on tapes and bail out if that
1187 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1188 */
1189 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1190
1191 if (!(STp = scsi_tape_get(dev))) {
1192 mutex_unlock(&st_mutex);
1193 return -ENXIO;
1194 }
1195
1196 write_lock(&st_dev_arr_lock);
1197 filp->private_data = STp;
1198 name = tape_name(STp);
1199
1200 if (STp->in_use) {
1201 write_unlock(&st_dev_arr_lock);
1202 scsi_tape_put(STp);
1203 mutex_unlock(&st_mutex);
1204 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
1205 return (-EBUSY);
1206 }
1207
1208 STp->in_use = 1;
1209 write_unlock(&st_dev_arr_lock);
1210 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1211
1212 if (!scsi_block_when_processing_errors(STp->device)) {
1213 retval = (-ENXIO);
1214 goto err_out;
1215 }
1216
1217 /* See that we have at least a one page buffer available */
1218 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1219 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n",
1220 name);
1221 retval = (-EOVERFLOW);
1222 goto err_out;
1223 }
1224
1225 (STp->buffer)->cleared = 0;
1226 (STp->buffer)->writing = 0;
1227 (STp->buffer)->syscall_result = 0;
1228
1229 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1230
1231 STp->dirty = 0;
1232 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1233 STps = &(STp->ps[i]);
1234 STps->rw = ST_IDLE;
1235 }
1236 STp->try_dio_now = STp->try_dio;
1237 STp->recover_count = 0;
1238 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1239 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1240
1241 retval = check_tape(STp, filp);
1242 if (retval < 0)
1243 goto err_out;
1244 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1245 retval != CHKRES_READY) {
1246 if (STp->ready == NO_TAPE)
1247 retval = (-ENOMEDIUM);
1248 else
1249 retval = (-EIO);
1250 goto err_out;
1251 }
1252 mutex_unlock(&st_mutex);
1253 return 0;
1254
1255 err_out:
1256 normalize_buffer(STp->buffer);
1257 STp->in_use = 0;
1258 scsi_tape_put(STp);
1259 mutex_unlock(&st_mutex);
1260 return retval;
1261
1262}
1263
1264
1265/* Flush the tape buffer before close */
1266static int st_flush(struct file *filp, fl_owner_t id)
1267{
1268 int result = 0, result2;
1269 unsigned char cmd[MAX_COMMAND_SIZE];
1270 struct st_request *SRpnt;
1271 struct scsi_tape *STp = filp->private_data;
1272 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1273 struct st_partstat *STps = &(STp->ps[STp->partition]);
1274 char *name = tape_name(STp);
1275
1276 if (file_count(filp) > 1)
1277 return 0;
1278
1279 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1280 result = st_flush_write_buffer(STp);
1281 if (result != 0 && result != (-ENOSPC))
1282 goto out;
1283 }
1284
1285 if (STp->can_partitions &&
1286 (result2 = switch_partition(STp)) < 0) {
1287 DEBC(printk(ST_DEB_MSG
1288 "%s: switch_partition at close failed.\n", name));
1289 if (result == 0)
1290 result = result2;
1291 goto out;
1292 }
1293
1294 DEBC( if (STp->nbr_requests)
1295 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n",
1296 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages));
1297
1298 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1299 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1300
1301 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n",
1302 name, STp->nbr_waits, STp->nbr_finished);
1303 )
1304
1305 memset(cmd, 0, MAX_COMMAND_SIZE);
1306 cmd[0] = WRITE_FILEMARKS;
1307 cmd[4] = 1 + STp->two_fm;
1308
1309 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1310 STp->device->request_queue->rq_timeout,
1311 MAX_WRITE_RETRIES, 1);
1312 if (!SRpnt) {
1313 result = (STp->buffer)->syscall_result;
1314 goto out;
1315 }
1316
1317 if (STp->buffer->syscall_result == 0 ||
1318 (cmdstatp->have_sense && !cmdstatp->deferred &&
1319 (cmdstatp->flags & SENSE_EOM) &&
1320 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1321 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1322 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1323 /* Write successful at EOM */
1324 st_release_request(SRpnt);
1325 SRpnt = NULL;
1326 if (STps->drv_file >= 0)
1327 STps->drv_file++;
1328 STps->drv_block = 0;
1329 if (STp->two_fm)
1330 cross_eof(STp, 0);
1331 STps->eof = ST_FM;
1332 }
1333 else { /* Write error */
1334 st_release_request(SRpnt);
1335 SRpnt = NULL;
1336 printk(KERN_ERR "%s: Error on write filemark.\n", name);
1337 if (result == 0)
1338 result = (-EIO);
1339 }
1340
1341 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n",
1342 name, cmd[4]));
1343 } else if (!STp->rew_at_close) {
1344 STps = &(STp->ps[STp->partition]);
1345 if (!STm->sysv || STps->rw != ST_READING) {
1346 if (STp->can_bsr)
1347 result = flush_buffer(STp, 0);
1348 else if (STps->eof == ST_FM_HIT) {
1349 result = cross_eof(STp, 0);
1350 if (result) {
1351 if (STps->drv_file >= 0)
1352 STps->drv_file++;
1353 STps->drv_block = 0;
1354 STps->eof = ST_FM;
1355 } else
1356 STps->eof = ST_NOEOF;
1357 }
1358 } else if ((STps->eof == ST_NOEOF &&
1359 !(result = cross_eof(STp, 1))) ||
1360 STps->eof == ST_FM_HIT) {
1361 if (STps->drv_file >= 0)
1362 STps->drv_file++;
1363 STps->drv_block = 0;
1364 STps->eof = ST_FM;
1365 }
1366 }
1367
1368 out:
1369 if (STp->rew_at_close) {
1370 result2 = st_int_ioctl(STp, MTREW, 1);
1371 if (result == 0)
1372 result = result2;
1373 }
1374 return result;
1375}
1376
1377
1378/* Close the device and release it. BKL is not needed: this is the only thread
1379 accessing this tape. */
1380static int st_release(struct inode *inode, struct file *filp)
1381{
1382 int result = 0;
1383 struct scsi_tape *STp = filp->private_data;
1384
1385 if (STp->door_locked == ST_LOCKED_AUTO)
1386 do_door_lock(STp, 0);
1387
1388 normalize_buffer(STp->buffer);
1389 write_lock(&st_dev_arr_lock);
1390 STp->in_use = 0;
1391 write_unlock(&st_dev_arr_lock);
1392 scsi_tape_put(STp);
1393
1394 return result;
1395}
1396
1397/* The checks common to both reading and writing */
1398static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1399{
1400 ssize_t retval = 0;
1401
1402 /*
1403 * If we are in the middle of error recovery, don't let anyone
1404 * else try and use this device. Also, if error recovery fails, it
1405 * may try and take the device offline, in which case all further
1406 * access to the device is prohibited.
1407 */
1408 if (!scsi_block_when_processing_errors(STp->device)) {
1409 retval = (-ENXIO);
1410 goto out;
1411 }
1412
1413 if (STp->ready != ST_READY) {
1414 if (STp->ready == ST_NO_TAPE)
1415 retval = (-ENOMEDIUM);
1416 else
1417 retval = (-EIO);
1418 goto out;
1419 }
1420
1421 if (! STp->modes[STp->current_mode].defined) {
1422 retval = (-ENXIO);
1423 goto out;
1424 }
1425
1426
1427 /*
1428 * If there was a bus reset, block further access
1429 * to this device.
1430 */
1431 if (STp->pos_unknown) {
1432 retval = (-EIO);
1433 goto out;
1434 }
1435
1436 if (count == 0)
1437 goto out;
1438
1439 DEB(
1440 if (!STp->in_use) {
1441 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp));
1442 retval = (-EIO);
1443 goto out;
1444 } ) /* end DEB */
1445
1446 if (STp->can_partitions &&
1447 (retval = switch_partition(STp)) < 0)
1448 goto out;
1449
1450 if (STp->block_size == 0 && STp->max_block > 0 &&
1451 (count < STp->min_block || count > STp->max_block)) {
1452 retval = (-EINVAL);
1453 goto out;
1454 }
1455
1456 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1457 !do_door_lock(STp, 1))
1458 STp->door_locked = ST_LOCKED_AUTO;
1459
1460 out:
1461 return retval;
1462}
1463
1464
1465static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1466 size_t count, int is_read)
1467{
1468 int i, bufsize, retval = 0;
1469 struct st_buffer *STbp = STp->buffer;
1470
1471 if (is_read)
1472 i = STp->try_dio_now && try_rdio;
1473 else
1474 i = STp->try_dio_now && try_wdio;
1475
1476 if (i && ((unsigned long)buf & queue_dma_alignment(
1477 STp->device->request_queue)) == 0) {
1478 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1479 count, (is_read ? READ : WRITE));
1480 if (i > 0) {
1481 STbp->do_dio = i;
1482 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1483 }
1484 else
1485 STbp->do_dio = 0; /* fall back to buffering with any error */
1486 STbp->sg_segs = STbp->do_dio;
1487 DEB(
1488 if (STbp->do_dio) {
1489 STp->nbr_dio++;
1490 STp->nbr_pages += STbp->do_dio;
1491 }
1492 )
1493 } else
1494 STbp->do_dio = 0;
1495 DEB( STp->nbr_requests++; )
1496
1497 if (!STbp->do_dio) {
1498 if (STp->block_size)
1499 bufsize = STp->block_size > st_fixed_buffer_size ?
1500 STp->block_size : st_fixed_buffer_size;
1501 else {
1502 bufsize = count;
1503 /* Make sure that data from previous user is not leaked even if
1504 HBA does not return correct residual */
1505 if (is_read && STp->sili && !STbp->cleared)
1506 clear_buffer(STbp);
1507 }
1508
1509 if (bufsize > STbp->buffer_size &&
1510 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1511 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
1512 tape_name(STp), bufsize);
1513 retval = (-EOVERFLOW);
1514 goto out;
1515 }
1516 if (STp->block_size)
1517 STbp->buffer_blocks = bufsize / STp->block_size;
1518 }
1519
1520 out:
1521 return retval;
1522}
1523
1524
1525/* Can be called more than once after each setup_buffer() */
1526static void release_buffering(struct scsi_tape *STp, int is_read)
1527{
1528 struct st_buffer *STbp;
1529
1530 STbp = STp->buffer;
1531 if (STbp->do_dio) {
1532 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1533 STbp->do_dio = 0;
1534 STbp->sg_segs = 0;
1535 }
1536}
1537
1538
1539/* Write command */
1540static ssize_t
1541st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1542{
1543 ssize_t total;
1544 ssize_t i, do_count, blks, transfer;
1545 ssize_t retval;
1546 int undone, retry_eot = 0, scode;
1547 int async_write;
1548 unsigned char cmd[MAX_COMMAND_SIZE];
1549 const char __user *b_point;
1550 struct st_request *SRpnt = NULL;
1551 struct scsi_tape *STp = filp->private_data;
1552 struct st_modedef *STm;
1553 struct st_partstat *STps;
1554 struct st_buffer *STbp;
1555 char *name = tape_name(STp);
1556
1557 if (mutex_lock_interruptible(&STp->lock))
1558 return -ERESTARTSYS;
1559
1560 retval = rw_checks(STp, filp, count);
1561 if (retval || count == 0)
1562 goto out;
1563
1564 /* Write must be integral number of blocks */
1565 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1566 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n",
1567 name);
1568 retval = (-EINVAL);
1569 goto out;
1570 }
1571
1572 STm = &(STp->modes[STp->current_mode]);
1573 STps = &(STp->ps[STp->partition]);
1574
1575 if (STp->write_prot) {
1576 retval = (-EACCES);
1577 goto out;
1578 }
1579
1580
1581 if (STps->rw == ST_READING) {
1582 retval = flush_buffer(STp, 0);
1583 if (retval)
1584 goto out;
1585 STps->rw = ST_WRITING;
1586 } else if (STps->rw != ST_WRITING &&
1587 STps->drv_file == 0 && STps->drv_block == 0) {
1588 if ((retval = set_mode_densblk(STp, STm)) < 0)
1589 goto out;
1590 if (STm->default_compression != ST_DONT_TOUCH &&
1591 !(STp->compression_changed)) {
1592 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1593 printk(KERN_WARNING "%s: Can't set default compression.\n",
1594 name);
1595 if (modes_defined) {
1596 retval = (-EINVAL);
1597 goto out;
1598 }
1599 }
1600 }
1601 }
1602
1603 STbp = STp->buffer;
1604 i = write_behind_check(STp);
1605 if (i) {
1606 if (i == -ENOSPC)
1607 STps->eof = ST_EOM_OK;
1608 else
1609 STps->eof = ST_EOM_ERROR;
1610 }
1611
1612 if (STps->eof == ST_EOM_OK) {
1613 STps->eof = ST_EOD_1; /* allow next write */
1614 retval = (-ENOSPC);
1615 goto out;
1616 }
1617 else if (STps->eof == ST_EOM_ERROR) {
1618 retval = (-EIO);
1619 goto out;
1620 }
1621
1622 /* Check the buffer readability in cases where copy_user might catch
1623 the problems after some tape movement. */
1624 if (STp->block_size != 0 &&
1625 !STbp->do_dio &&
1626 (copy_from_user(&i, buf, 1) != 0 ||
1627 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1628 retval = (-EFAULT);
1629 goto out;
1630 }
1631
1632 retval = setup_buffering(STp, buf, count, 0);
1633 if (retval)
1634 goto out;
1635
1636 total = count;
1637
1638 memset(cmd, 0, MAX_COMMAND_SIZE);
1639 cmd[0] = WRITE_6;
1640 cmd[1] = (STp->block_size != 0);
1641
1642 STps->rw = ST_WRITING;
1643
1644 b_point = buf;
1645 while (count > 0 && !retry_eot) {
1646
1647 if (STbp->do_dio) {
1648 do_count = count;
1649 }
1650 else {
1651 if (STp->block_size == 0)
1652 do_count = count;
1653 else {
1654 do_count = STbp->buffer_blocks * STp->block_size -
1655 STbp->buffer_bytes;
1656 if (do_count > count)
1657 do_count = count;
1658 }
1659
1660 i = append_to_buffer(b_point, STbp, do_count);
1661 if (i) {
1662 retval = i;
1663 goto out;
1664 }
1665 }
1666 count -= do_count;
1667 b_point += do_count;
1668
1669 async_write = STp->block_size == 0 && !STbp->do_dio &&
1670 STm->do_async_writes && STps->eof < ST_EOM_OK;
1671
1672 if (STp->block_size != 0 && STm->do_buffer_writes &&
1673 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1674 STbp->buffer_bytes < STbp->buffer_size) {
1675 STp->dirty = 1;
1676 /* Don't write a buffer that is not full enough. */
1677 if (!async_write && count == 0)
1678 break;
1679 }
1680
1681 retry_write:
1682 if (STp->block_size == 0)
1683 blks = transfer = do_count;
1684 else {
1685 if (!STbp->do_dio)
1686 blks = STbp->buffer_bytes;
1687 else
1688 blks = do_count;
1689 blks /= STp->block_size;
1690 transfer = blks * STp->block_size;
1691 }
1692 cmd[2] = blks >> 16;
1693 cmd[3] = blks >> 8;
1694 cmd[4] = blks;
1695
1696 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1697 STp->device->request_queue->rq_timeout,
1698 MAX_WRITE_RETRIES, !async_write);
1699 if (!SRpnt) {
1700 retval = STbp->syscall_result;
1701 goto out;
1702 }
1703 if (async_write && !STbp->syscall_result) {
1704 STbp->writing = transfer;
1705 STp->dirty = !(STbp->writing ==
1706 STbp->buffer_bytes);
1707 SRpnt = NULL; /* Prevent releasing this request! */
1708 DEB( STp->write_pending = 1; )
1709 break;
1710 }
1711
1712 if (STbp->syscall_result != 0) {
1713 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1714
1715 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name));
1716 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1717 scode = cmdstatp->sense_hdr.sense_key;
1718 if (cmdstatp->remainder_valid)
1719 undone = (int)cmdstatp->uremainder64;
1720 else if (STp->block_size == 0 &&
1721 scode == VOLUME_OVERFLOW)
1722 undone = transfer;
1723 else
1724 undone = 0;
1725 if (STp->block_size != 0)
1726 undone *= STp->block_size;
1727 if (undone <= do_count) {
1728 /* Only data from this write is not written */
1729 count += undone;
1730 b_point -= undone;
1731 do_count -= undone;
1732 if (STp->block_size)
1733 blks = (transfer - undone) / STp->block_size;
1734 STps->eof = ST_EOM_OK;
1735 /* Continue in fixed block mode if all written
1736 in this request but still something left to write
1737 (retval left to zero)
1738 */
1739 if (STp->block_size == 0 ||
1740 undone > 0 || count == 0)
1741 retval = (-ENOSPC); /* EOM within current request */
1742 DEBC(printk(ST_DEB_MSG
1743 "%s: EOM with %d bytes unwritten.\n",
1744 name, (int)count));
1745 } else {
1746 /* EOT within data buffered earlier (possible only
1747 in fixed block mode without direct i/o) */
1748 if (!retry_eot && !cmdstatp->deferred &&
1749 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1750 move_buffer_data(STp->buffer, transfer - undone);
1751 retry_eot = 1;
1752 if (STps->drv_block >= 0) {
1753 STps->drv_block += (transfer - undone) /
1754 STp->block_size;
1755 }
1756 STps->eof = ST_EOM_OK;
1757 DEBC(printk(ST_DEB_MSG
1758 "%s: Retry write of %d bytes at EOM.\n",
1759 name, STp->buffer->buffer_bytes));
1760 goto retry_write;
1761 }
1762 else {
1763 /* Either error within data buffered by driver or
1764 failed retry */
1765 count -= do_count;
1766 blks = do_count = 0;
1767 STps->eof = ST_EOM_ERROR;
1768 STps->drv_block = (-1); /* Too cautious? */
1769 retval = (-EIO); /* EOM for old data */
1770 DEBC(printk(ST_DEB_MSG
1771 "%s: EOM with lost data.\n",
1772 name));
1773 }
1774 }
1775 } else {
1776 count += do_count;
1777 STps->drv_block = (-1); /* Too cautious? */
1778 retval = STbp->syscall_result;
1779 }
1780
1781 }
1782
1783 if (STps->drv_block >= 0) {
1784 if (STp->block_size == 0)
1785 STps->drv_block += (do_count > 0);
1786 else
1787 STps->drv_block += blks;
1788 }
1789
1790 STbp->buffer_bytes = 0;
1791 STp->dirty = 0;
1792
1793 if (retval || retry_eot) {
1794 if (count < total)
1795 retval = total - count;
1796 goto out;
1797 }
1798 }
1799
1800 if (STps->eof == ST_EOD_1)
1801 STps->eof = ST_EOM_OK;
1802 else if (STps->eof != ST_EOM_OK)
1803 STps->eof = ST_NOEOF;
1804 retval = total - count;
1805
1806 out:
1807 if (SRpnt != NULL)
1808 st_release_request(SRpnt);
1809 release_buffering(STp, 0);
1810 mutex_unlock(&STp->lock);
1811
1812 return retval;
1813}
1814
1815/* Read data from the tape. Returns zero in the normal case, one if the
1816 eof status has changed, and the negative error code in case of a
1817 fatal error. Otherwise updates the buffer and the eof state.
1818
1819 Does release user buffer mapping if it is set.
1820*/
1821static long read_tape(struct scsi_tape *STp, long count,
1822 struct st_request ** aSRpnt)
1823{
1824 int transfer, blks, bytes;
1825 unsigned char cmd[MAX_COMMAND_SIZE];
1826 struct st_request *SRpnt;
1827 struct st_modedef *STm;
1828 struct st_partstat *STps;
1829 struct st_buffer *STbp;
1830 int retval = 0;
1831 char *name = tape_name(STp);
1832
1833 if (count == 0)
1834 return 0;
1835
1836 STm = &(STp->modes[STp->current_mode]);
1837 STps = &(STp->ps[STp->partition]);
1838 if (STps->eof == ST_FM_HIT)
1839 return 1;
1840 STbp = STp->buffer;
1841
1842 if (STp->block_size == 0)
1843 blks = bytes = count;
1844 else {
1845 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1846 blks = (STp->buffer)->buffer_blocks;
1847 bytes = blks * STp->block_size;
1848 } else {
1849 bytes = count;
1850 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1851 bytes = (STp->buffer)->buffer_size;
1852 blks = bytes / STp->block_size;
1853 bytes = blks * STp->block_size;
1854 }
1855 }
1856
1857 memset(cmd, 0, MAX_COMMAND_SIZE);
1858 cmd[0] = READ_6;
1859 cmd[1] = (STp->block_size != 0);
1860 if (!cmd[1] && STp->sili)
1861 cmd[1] |= 2;
1862 cmd[2] = blks >> 16;
1863 cmd[3] = blks >> 8;
1864 cmd[4] = blks;
1865
1866 SRpnt = *aSRpnt;
1867 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1868 STp->device->request_queue->rq_timeout,
1869 MAX_RETRIES, 1);
1870 release_buffering(STp, 1);
1871 *aSRpnt = SRpnt;
1872 if (!SRpnt)
1873 return STbp->syscall_result;
1874
1875 STbp->read_pointer = 0;
1876 STps->at_sm = 0;
1877
1878 /* Something to check */
1879 if (STbp->syscall_result) {
1880 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1881
1882 retval = 1;
1883 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1884 name,
1885 SRpnt->sense[0], SRpnt->sense[1],
1886 SRpnt->sense[2], SRpnt->sense[3],
1887 SRpnt->sense[4], SRpnt->sense[5],
1888 SRpnt->sense[6], SRpnt->sense[7]));
1889 if (cmdstatp->have_sense) {
1890
1891 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1892 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1893
1894 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1895 /* Compute the residual count */
1896 if (cmdstatp->remainder_valid)
1897 transfer = (int)cmdstatp->uremainder64;
1898 else
1899 transfer = 0;
1900 if (STp->block_size == 0 &&
1901 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1902 transfer = bytes;
1903
1904 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1905 if (STp->block_size == 0) {
1906 if (transfer <= 0) {
1907 if (transfer < 0)
1908 printk(KERN_NOTICE
1909 "%s: Failed to read %d byte block with %d byte transfer.\n",
1910 name, bytes - transfer, bytes);
1911 if (STps->drv_block >= 0)
1912 STps->drv_block += 1;
1913 STbp->buffer_bytes = 0;
1914 return (-ENOMEM);
1915 }
1916 STbp->buffer_bytes = bytes - transfer;
1917 } else {
1918 st_release_request(SRpnt);
1919 SRpnt = *aSRpnt = NULL;
1920 if (transfer == blks) { /* We did not get anything, error */
1921 printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
1922 if (STps->drv_block >= 0)
1923 STps->drv_block += blks - transfer + 1;
1924 st_int_ioctl(STp, MTBSR, 1);
1925 return (-EIO);
1926 }
1927 /* We have some data, deliver it */
1928 STbp->buffer_bytes = (blks - transfer) *
1929 STp->block_size;
1930 DEBC(printk(ST_DEB_MSG
1931 "%s: ILI but enough data received %ld %d.\n",
1932 name, count, STbp->buffer_bytes));
1933 if (STps->drv_block >= 0)
1934 STps->drv_block += 1;
1935 if (st_int_ioctl(STp, MTBSR, 1))
1936 return (-EIO);
1937 }
1938 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
1939 if (STps->eof != ST_FM_HIT)
1940 STps->eof = ST_FM_HIT;
1941 else
1942 STps->eof = ST_EOD_2;
1943 if (STp->block_size == 0)
1944 STbp->buffer_bytes = 0;
1945 else
1946 STbp->buffer_bytes =
1947 bytes - transfer * STp->block_size;
1948 DEBC(printk(ST_DEB_MSG
1949 "%s: EOF detected (%d bytes read).\n",
1950 name, STbp->buffer_bytes));
1951 } else if (cmdstatp->flags & SENSE_EOM) {
1952 if (STps->eof == ST_FM)
1953 STps->eof = ST_EOD_1;
1954 else
1955 STps->eof = ST_EOM_OK;
1956 if (STp->block_size == 0)
1957 STbp->buffer_bytes = bytes - transfer;
1958 else
1959 STbp->buffer_bytes =
1960 bytes - transfer * STp->block_size;
1961
1962 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n",
1963 name, STbp->buffer_bytes));
1964 }
1965 }
1966 /* end of EOF, EOM, ILI test */
1967 else { /* nonzero sense key */
1968 DEBC(printk(ST_DEB_MSG
1969 "%s: Tape error while reading.\n", name));
1970 STps->drv_block = (-1);
1971 if (STps->eof == ST_FM &&
1972 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
1973 DEBC(printk(ST_DEB_MSG
1974 "%s: Zero returned for first BLANK CHECK after EOF.\n",
1975 name));
1976 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
1977 } else /* Some other extended sense code */
1978 retval = (-EIO);
1979 }
1980
1981 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
1982 STbp->buffer_bytes = 0;
1983 }
1984 /* End of extended sense test */
1985 else { /* Non-extended sense */
1986 retval = STbp->syscall_result;
1987 }
1988
1989 }
1990 /* End of error handling */
1991 else { /* Read successful */
1992 STbp->buffer_bytes = bytes;
1993 if (STp->sili) /* In fixed block mode residual is always zero here */
1994 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
1995 }
1996
1997 if (STps->drv_block >= 0) {
1998 if (STp->block_size == 0)
1999 STps->drv_block++;
2000 else
2001 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2002 }
2003 return retval;
2004}
2005
2006
2007/* Read command */
2008static ssize_t
2009st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2010{
2011 ssize_t total;
2012 ssize_t retval = 0;
2013 ssize_t i, transfer;
2014 int special, do_dio = 0;
2015 struct st_request *SRpnt = NULL;
2016 struct scsi_tape *STp = filp->private_data;
2017 struct st_modedef *STm;
2018 struct st_partstat *STps;
2019 struct st_buffer *STbp = STp->buffer;
2020 DEB( char *name = tape_name(STp); )
2021
2022 if (mutex_lock_interruptible(&STp->lock))
2023 return -ERESTARTSYS;
2024
2025 retval = rw_checks(STp, filp, count);
2026 if (retval || count == 0)
2027 goto out;
2028
2029 STm = &(STp->modes[STp->current_mode]);
2030 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2031 if (!STm->do_read_ahead) {
2032 retval = (-EINVAL); /* Read must be integral number of blocks */
2033 goto out;
2034 }
2035 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2036 }
2037
2038 STps = &(STp->ps[STp->partition]);
2039 if (STps->rw == ST_WRITING) {
2040 retval = flush_buffer(STp, 0);
2041 if (retval)
2042 goto out;
2043 STps->rw = ST_READING;
2044 }
2045 DEB(
2046 if (debugging && STps->eof != ST_NOEOF)
2047 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name,
2048 STps->eof, STbp->buffer_bytes);
2049 ) /* end DEB */
2050
2051 retval = setup_buffering(STp, buf, count, 1);
2052 if (retval)
2053 goto out;
2054 do_dio = STbp->do_dio;
2055
2056 if (STbp->buffer_bytes == 0 &&
2057 STps->eof >= ST_EOD_1) {
2058 if (STps->eof < ST_EOD) {
2059 STps->eof += 1;
2060 retval = 0;
2061 goto out;
2062 }
2063 retval = (-EIO); /* EOM or Blank Check */
2064 goto out;
2065 }
2066
2067 if (do_dio) {
2068 /* Check the buffer writability before any tape movement. Don't alter
2069 buffer data. */
2070 if (copy_from_user(&i, buf, 1) != 0 ||
2071 copy_to_user(buf, &i, 1) != 0 ||
2072 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2073 copy_to_user(buf + count - 1, &i, 1) != 0) {
2074 retval = (-EFAULT);
2075 goto out;
2076 }
2077 }
2078
2079 STps->rw = ST_READING;
2080
2081
2082 /* Loop until enough data in buffer or a special condition found */
2083 for (total = 0, special = 0; total < count && !special;) {
2084
2085 /* Get new data if the buffer is empty */
2086 if (STbp->buffer_bytes == 0) {
2087 special = read_tape(STp, count - total, &SRpnt);
2088 if (special < 0) { /* No need to continue read */
2089 retval = special;
2090 goto out;
2091 }
2092 }
2093
2094 /* Move the data from driver buffer to user buffer */
2095 if (STbp->buffer_bytes > 0) {
2096 DEB(
2097 if (debugging && STps->eof != ST_NOEOF)
2098 printk(ST_DEB_MSG
2099 "%s: EOF up (%d). Left %d, needed %d.\n", name,
2100 STps->eof, STbp->buffer_bytes,
2101 (int)(count - total));
2102 ) /* end DEB */
2103 transfer = STbp->buffer_bytes < count - total ?
2104 STbp->buffer_bytes : count - total;
2105 if (!do_dio) {
2106 i = from_buffer(STbp, buf, transfer);
2107 if (i) {
2108 retval = i;
2109 goto out;
2110 }
2111 }
2112 buf += transfer;
2113 total += transfer;
2114 }
2115
2116 if (STp->block_size == 0)
2117 break; /* Read only one variable length block */
2118
2119 } /* for (total = 0, special = 0;
2120 total < count && !special; ) */
2121
2122 /* Change the eof state if no data from tape or buffer */
2123 if (total == 0) {
2124 if (STps->eof == ST_FM_HIT) {
2125 STps->eof = ST_FM;
2126 STps->drv_block = 0;
2127 if (STps->drv_file >= 0)
2128 STps->drv_file++;
2129 } else if (STps->eof == ST_EOD_1) {
2130 STps->eof = ST_EOD_2;
2131 STps->drv_block = 0;
2132 if (STps->drv_file >= 0)
2133 STps->drv_file++;
2134 } else if (STps->eof == ST_EOD_2)
2135 STps->eof = ST_EOD;
2136 } else if (STps->eof == ST_FM)
2137 STps->eof = ST_NOEOF;
2138 retval = total;
2139
2140 out:
2141 if (SRpnt != NULL) {
2142 st_release_request(SRpnt);
2143 SRpnt = NULL;
2144 }
2145 if (do_dio) {
2146 release_buffering(STp, 1);
2147 STbp->buffer_bytes = 0;
2148 }
2149 mutex_unlock(&STp->lock);
2150
2151 return retval;
2152}
2153
2154
2155
2156DEB(
2157/* Set the driver options */
2158static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name)
2159{
2160 if (debugging) {
2161 printk(KERN_INFO
2162 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
2163 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
2164 STm->do_read_ahead);
2165 printk(KERN_INFO
2166 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
2167 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
2168 printk(KERN_INFO
2169 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
2170 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
2171 STp->scsi2_logical);
2172 printk(KERN_INFO
2173 "%s: sysv: %d nowait: %d sili: %d\n", name, STm->sysv, STp->immediate,
2174 STp->sili);
2175 printk(KERN_INFO "%s: debugging: %d\n",
2176 name, debugging);
2177 }
2178}
2179 )
2180
2181
2182static int st_set_options(struct scsi_tape *STp, long options)
2183{
2184 int value;
2185 long code;
2186 struct st_modedef *STm;
2187 char *name = tape_name(STp);
2188 struct cdev *cd0, *cd1;
2189
2190 STm = &(STp->modes[STp->current_mode]);
2191 if (!STm->defined) {
2192 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
2193 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2194 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
2195 modes_defined = 1;
2196 DEBC(printk(ST_DEB_MSG
2197 "%s: Initialized mode %d definition from mode 0\n",
2198 name, STp->current_mode));
2199 }
2200
2201 code = options & MT_ST_OPTIONS;
2202 if (code == MT_ST_BOOLEANS) {
2203 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2204 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2205 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2206 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2207 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2208 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2209 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2210 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2211 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2212 if ((STp->device)->scsi_level >= SCSI_2)
2213 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2214 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2215 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2216 STm->sysv = (options & MT_ST_SYSV) != 0;
2217 STp->sili = (options & MT_ST_SILI) != 0;
2218 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2219 st_log_options(STp, STm, name); )
2220 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2221 value = (code == MT_ST_SETBOOLEANS);
2222 if ((options & MT_ST_BUFFER_WRITES) != 0)
2223 STm->do_buffer_writes = value;
2224 if ((options & MT_ST_ASYNC_WRITES) != 0)
2225 STm->do_async_writes = value;
2226 if ((options & MT_ST_DEF_WRITES) != 0)
2227 STm->defaults_for_writes = value;
2228 if ((options & MT_ST_READ_AHEAD) != 0)
2229 STm->do_read_ahead = value;
2230 if ((options & MT_ST_TWO_FM) != 0)
2231 STp->two_fm = value;
2232 if ((options & MT_ST_FAST_MTEOM) != 0)
2233 STp->fast_mteom = value;
2234 if ((options & MT_ST_AUTO_LOCK) != 0)
2235 STp->do_auto_lock = value;
2236 if ((options & MT_ST_CAN_BSR) != 0)
2237 STp->can_bsr = value;
2238 if ((options & MT_ST_NO_BLKLIMS) != 0)
2239 STp->omit_blklims = value;
2240 if ((STp->device)->scsi_level >= SCSI_2 &&
2241 (options & MT_ST_CAN_PARTITIONS) != 0)
2242 STp->can_partitions = value;
2243 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2244 STp->scsi2_logical = value;
2245 if ((options & MT_ST_NOWAIT) != 0)
2246 STp->immediate = value;
2247 if ((options & MT_ST_SYSV) != 0)
2248 STm->sysv = value;
2249 if ((options & MT_ST_SILI) != 0)
2250 STp->sili = value;
2251 DEB(
2252 if ((options & MT_ST_DEBUGGING) != 0)
2253 debugging = value;
2254 st_log_options(STp, STm, name); )
2255 } else if (code == MT_ST_WRITE_THRESHOLD) {
2256 /* Retained for compatibility */
2257 } else if (code == MT_ST_DEF_BLKSIZE) {
2258 value = (options & ~MT_ST_OPTIONS);
2259 if (value == ~MT_ST_OPTIONS) {
2260 STm->default_blksize = (-1);
2261 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name));
2262 } else {
2263 STm->default_blksize = value;
2264 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n",
2265 name, STm->default_blksize));
2266 if (STp->ready == ST_READY) {
2267 STp->blksize_changed = 0;
2268 set_mode_densblk(STp, STm);
2269 }
2270 }
2271 } else if (code == MT_ST_TIMEOUTS) {
2272 value = (options & ~MT_ST_OPTIONS);
2273 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2274 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2275 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
2276 (value & ~MT_ST_SET_LONG_TIMEOUT)));
2277 } else {
2278 blk_queue_rq_timeout(STp->device->request_queue,
2279 value * HZ);
2280 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
2281 name, value) );
2282 }
2283 } else if (code == MT_ST_SET_CLN) {
2284 value = (options & ~MT_ST_OPTIONS) & 0xff;
2285 if (value != 0 &&
2286 (value < EXTENDED_SENSE_START ||
2287 value >= SCSI_SENSE_BUFFERSIZE))
2288 return (-EINVAL);
2289 STp->cln_mode = value;
2290 STp->cln_sense_mask = (options >> 8) & 0xff;
2291 STp->cln_sense_value = (options >> 16) & 0xff;
2292 printk(KERN_INFO
2293 "%s: Cleaning request mode %d, mask %02x, value %02x\n",
2294 name, value, STp->cln_sense_mask, STp->cln_sense_value);
2295 } else if (code == MT_ST_DEF_OPTIONS) {
2296 code = (options & ~MT_ST_CLEAR_DEFAULT);
2297 value = (options & MT_ST_CLEAR_DEFAULT);
2298 if (code == MT_ST_DEF_DENSITY) {
2299 if (value == MT_ST_CLEAR_DEFAULT) {
2300 STm->default_density = (-1);
2301 DEBC( printk(KERN_INFO "%s: Density default disabled.\n",
2302 name));
2303 } else {
2304 STm->default_density = value & 0xff;
2305 DEBC( printk(KERN_INFO "%s: Density default set to %x\n",
2306 name, STm->default_density));
2307 if (STp->ready == ST_READY) {
2308 STp->density_changed = 0;
2309 set_mode_densblk(STp, STm);
2310 }
2311 }
2312 } else if (code == MT_ST_DEF_DRVBUFFER) {
2313 if (value == MT_ST_CLEAR_DEFAULT) {
2314 STp->default_drvbuffer = 0xff;
2315 DEBC( printk(KERN_INFO
2316 "%s: Drive buffer default disabled.\n", name));
2317 } else {
2318 STp->default_drvbuffer = value & 7;
2319 DEBC( printk(KERN_INFO
2320 "%s: Drive buffer default set to %x\n",
2321 name, STp->default_drvbuffer));
2322 if (STp->ready == ST_READY)
2323 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2324 }
2325 } else if (code == MT_ST_DEF_COMPRESSION) {
2326 if (value == MT_ST_CLEAR_DEFAULT) {
2327 STm->default_compression = ST_DONT_TOUCH;
2328 DEBC( printk(KERN_INFO
2329 "%s: Compression default disabled.\n", name));
2330 } else {
2331 if ((value & 0xff00) != 0) {
2332 STp->c_algo = (value & 0xff00) >> 8;
2333 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n",
2334 name, STp->c_algo));
2335 }
2336 if ((value & 0xff) != 0xff) {
2337 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2338 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n",
2339 name, (value & 1)));
2340 if (STp->ready == ST_READY) {
2341 STp->compression_changed = 0;
2342 st_compression(STp, (STm->default_compression == ST_YES));
2343 }
2344 }
2345 }
2346 }
2347 } else
2348 return (-EIO);
2349
2350 return 0;
2351}
2352
2353#define MODE_HEADER_LENGTH 4
2354
2355/* Mode header and page byte offsets */
2356#define MH_OFF_DATA_LENGTH 0
2357#define MH_OFF_MEDIUM_TYPE 1
2358#define MH_OFF_DEV_SPECIFIC 2
2359#define MH_OFF_BDESCS_LENGTH 3
2360#define MP_OFF_PAGE_NBR 0
2361#define MP_OFF_PAGE_LENGTH 1
2362
2363/* Mode header and page bit masks */
2364#define MH_BIT_WP 0x80
2365#define MP_MSK_PAGE_NBR 0x3f
2366
2367/* Don't return block descriptors */
2368#define MODE_SENSE_OMIT_BDESCS 0x08
2369
2370#define MODE_SELECT_PAGE_FORMAT 0x10
2371
2372/* Read a mode page into the tape buffer. The block descriptors are included
2373 if incl_block_descs is true. The page control is ored to the page number
2374 parameter, if necessary. */
2375static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2376{
2377 unsigned char cmd[MAX_COMMAND_SIZE];
2378 struct st_request *SRpnt;
2379
2380 memset(cmd, 0, MAX_COMMAND_SIZE);
2381 cmd[0] = MODE_SENSE;
2382 if (omit_block_descs)
2383 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2384 cmd[2] = page;
2385 cmd[4] = 255;
2386
2387 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2388 STp->device->request_queue->rq_timeout, 0, 1);
2389 if (SRpnt == NULL)
2390 return (STp->buffer)->syscall_result;
2391
2392 st_release_request(SRpnt);
2393
2394 return STp->buffer->syscall_result;
2395}
2396
2397
2398/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2399 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2400static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2401{
2402 int pgo;
2403 unsigned char cmd[MAX_COMMAND_SIZE];
2404 struct st_request *SRpnt;
2405 int timeout;
2406
2407 memset(cmd, 0, MAX_COMMAND_SIZE);
2408 cmd[0] = MODE_SELECT;
2409 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2410 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2411 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2412
2413 /* Clear reserved fields */
2414 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2415 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2416 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2417 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2418
2419 timeout = slow ?
2420 STp->long_timeout : STp->device->request_queue->rq_timeout;
2421 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2422 timeout, 0, 1);
2423 if (SRpnt == NULL)
2424 return (STp->buffer)->syscall_result;
2425
2426 st_release_request(SRpnt);
2427
2428 return STp->buffer->syscall_result;
2429}
2430
2431
2432#define COMPRESSION_PAGE 0x0f
2433#define COMPRESSION_PAGE_LENGTH 16
2434
2435#define CP_OFF_DCE_DCC 2
2436#define CP_OFF_C_ALGO 7
2437
2438#define DCE_MASK 0x80
2439#define DCC_MASK 0x40
2440#define RED_MASK 0x60
2441
2442
2443/* Control the compression with mode page 15. Algorithm not changed if zero.
2444
2445 The block descriptors are read and written because Sony SDT-7000 does not
2446 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2447 Including block descriptors should not cause any harm to other drives. */
2448
2449static int st_compression(struct scsi_tape * STp, int state)
2450{
2451 int retval;
2452 int mpoffs; /* Offset to mode page start */
2453 unsigned char *b_data = (STp->buffer)->b_data;
2454 DEB( char *name = tape_name(STp); )
2455
2456 if (STp->ready != ST_READY)
2457 return (-EIO);
2458
2459 /* Read the current page contents */
2460 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2461 if (retval) {
2462 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n",
2463 name));
2464 return (-EIO);
2465 }
2466
2467 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2468 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name,
2469 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)));
2470
2471 /* Check if compression can be changed */
2472 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2473 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name));
2474 return (-EIO);
2475 }
2476
2477 /* Do the change */
2478 if (state) {
2479 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2480 if (STp->c_algo != 0)
2481 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2482 }
2483 else {
2484 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2485 if (STp->c_algo != 0)
2486 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2487 }
2488
2489 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2490 if (retval) {
2491 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name));
2492 return (-EIO);
2493 }
2494 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n",
2495 name, state));
2496
2497 STp->compression_changed = 1;
2498 return 0;
2499}
2500
2501
2502/* Process the load and unload commands (does unload if the load code is zero) */
2503static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2504{
2505 int retval = (-EIO), timeout;
2506 DEB( char *name = tape_name(STp); )
2507 unsigned char cmd[MAX_COMMAND_SIZE];
2508 struct st_partstat *STps;
2509 struct st_request *SRpnt;
2510
2511 if (STp->ready != ST_READY && !load_code) {
2512 if (STp->ready == ST_NO_TAPE)
2513 return (-ENOMEDIUM);
2514 else
2515 return (-EIO);
2516 }
2517
2518 memset(cmd, 0, MAX_COMMAND_SIZE);
2519 cmd[0] = START_STOP;
2520 if (load_code)
2521 cmd[4] |= 1;
2522 /*
2523 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2524 */
2525 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2526 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2527 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n",
2528 name, (cmd[4]) ? "" : "un",
2529 load_code - MT_ST_HPLOADER_OFFSET));
2530 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2531 }
2532 if (STp->immediate) {
2533 cmd[1] = 1; /* Don't wait for completion */
2534 timeout = STp->device->request_queue->rq_timeout;
2535 }
2536 else
2537 timeout = STp->long_timeout;
2538
2539 DEBC(
2540 if (!load_code)
2541 printk(ST_DEB_MSG "%s: Unloading tape.\n", name);
2542 else
2543 printk(ST_DEB_MSG "%s: Loading tape.\n", name);
2544 );
2545
2546 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2547 timeout, MAX_RETRIES, 1);
2548 if (!SRpnt)
2549 return (STp->buffer)->syscall_result;
2550
2551 retval = (STp->buffer)->syscall_result;
2552 st_release_request(SRpnt);
2553
2554 if (!retval) { /* SCSI command successful */
2555
2556 if (!load_code) {
2557 STp->rew_at_close = 0;
2558 STp->ready = ST_NO_TAPE;
2559 }
2560 else {
2561 STp->rew_at_close = STp->autorew_dev;
2562 retval = check_tape(STp, filp);
2563 if (retval > 0)
2564 retval = 0;
2565 }
2566 }
2567 else {
2568 STps = &(STp->ps[STp->partition]);
2569 STps->drv_file = STps->drv_block = (-1);
2570 }
2571
2572 return retval;
2573}
2574
2575#if DEBUG
2576#define ST_DEB_FORWARD 0
2577#define ST_DEB_BACKWARD 1
2578static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
2579{
2580 s32 sc;
2581
2582 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2583 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2584 if (direction)
2585 sc = -sc;
2586 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
2587 direction ? "backward" : "forward", sc, units);
2588}
2589#endif
2590
2591
2592/* Internal ioctl function */
2593static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2594{
2595 int timeout;
2596 long ltmp;
2597 int ioctl_result;
2598 int chg_eof = 1;
2599 unsigned char cmd[MAX_COMMAND_SIZE];
2600 struct st_request *SRpnt;
2601 struct st_partstat *STps;
2602 int fileno, blkno, at_sm, undone;
2603 int datalen = 0, direction = DMA_NONE;
2604 char *name = tape_name(STp);
2605
2606 WARN_ON(STp->buffer->do_dio != 0);
2607 if (STp->ready != ST_READY) {
2608 if (STp->ready == ST_NO_TAPE)
2609 return (-ENOMEDIUM);
2610 else
2611 return (-EIO);
2612 }
2613 timeout = STp->long_timeout;
2614 STps = &(STp->ps[STp->partition]);
2615 fileno = STps->drv_file;
2616 blkno = STps->drv_block;
2617 at_sm = STps->at_sm;
2618
2619 memset(cmd, 0, MAX_COMMAND_SIZE);
2620 switch (cmd_in) {
2621 case MTFSFM:
2622 chg_eof = 0; /* Changed from the FSF after this */
2623 case MTFSF:
2624 cmd[0] = SPACE;
2625 cmd[1] = 0x01; /* Space FileMarks */
2626 cmd[2] = (arg >> 16);
2627 cmd[3] = (arg >> 8);
2628 cmd[4] = arg;
2629 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
2630 if (fileno >= 0)
2631 fileno += arg;
2632 blkno = 0;
2633 at_sm &= (arg == 0);
2634 break;
2635 case MTBSFM:
2636 chg_eof = 0; /* Changed from the FSF after this */
2637 case MTBSF:
2638 cmd[0] = SPACE;
2639 cmd[1] = 0x01; /* Space FileMarks */
2640 ltmp = (-arg);
2641 cmd[2] = (ltmp >> 16);
2642 cmd[3] = (ltmp >> 8);
2643 cmd[4] = ltmp;
2644 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
2645 if (fileno >= 0)
2646 fileno -= arg;
2647 blkno = (-1); /* We can't know the block number */
2648 at_sm &= (arg == 0);
2649 break;
2650 case MTFSR:
2651 cmd[0] = SPACE;
2652 cmd[1] = 0x00; /* Space Blocks */
2653 cmd[2] = (arg >> 16);
2654 cmd[3] = (arg >> 8);
2655 cmd[4] = arg;
2656 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
2657 if (blkno >= 0)
2658 blkno += arg;
2659 at_sm &= (arg == 0);
2660 break;
2661 case MTBSR:
2662 cmd[0] = SPACE;
2663 cmd[1] = 0x00; /* Space Blocks */
2664 ltmp = (-arg);
2665 cmd[2] = (ltmp >> 16);
2666 cmd[3] = (ltmp >> 8);
2667 cmd[4] = ltmp;
2668 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
2669 if (blkno >= 0)
2670 blkno -= arg;
2671 at_sm &= (arg == 0);
2672 break;
2673 case MTFSS:
2674 cmd[0] = SPACE;
2675 cmd[1] = 0x04; /* Space Setmarks */
2676 cmd[2] = (arg >> 16);
2677 cmd[3] = (arg >> 8);
2678 cmd[4] = arg;
2679 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
2680 if (arg != 0) {
2681 blkno = fileno = (-1);
2682 at_sm = 1;
2683 }
2684 break;
2685 case MTBSS:
2686 cmd[0] = SPACE;
2687 cmd[1] = 0x04; /* Space Setmarks */
2688 ltmp = (-arg);
2689 cmd[2] = (ltmp >> 16);
2690 cmd[3] = (ltmp >> 8);
2691 cmd[4] = ltmp;
2692 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
2693 if (arg != 0) {
2694 blkno = fileno = (-1);
2695 at_sm = 1;
2696 }
2697 break;
2698 case MTWEOF:
2699 case MTWEOFI:
2700 case MTWSM:
2701 if (STp->write_prot)
2702 return (-EACCES);
2703 cmd[0] = WRITE_FILEMARKS;
2704 if (cmd_in == MTWSM)
2705 cmd[1] = 2;
2706 if (cmd_in == MTWEOFI)
2707 cmd[1] |= 1;
2708 cmd[2] = (arg >> 16);
2709 cmd[3] = (arg >> 8);
2710 cmd[4] = arg;
2711 timeout = STp->device->request_queue->rq_timeout;
2712 DEBC(
2713 if (cmd_in != MTWSM)
2714 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
2715 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2716 else
2717 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name,
2718 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
2719 )
2720 if (fileno >= 0)
2721 fileno += arg;
2722 blkno = 0;
2723 at_sm = (cmd_in == MTWSM);
2724 break;
2725 case MTREW:
2726 cmd[0] = REZERO_UNIT;
2727 if (STp->immediate) {
2728 cmd[1] = 1; /* Don't wait for completion */
2729 timeout = STp->device->request_queue->rq_timeout;
2730 }
2731 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
2732 fileno = blkno = at_sm = 0;
2733 break;
2734 case MTNOP:
2735 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name));
2736 return 0; /* Should do something ? */
2737 break;
2738 case MTRETEN:
2739 cmd[0] = START_STOP;
2740 if (STp->immediate) {
2741 cmd[1] = 1; /* Don't wait for completion */
2742 timeout = STp->device->request_queue->rq_timeout;
2743 }
2744 cmd[4] = 3;
2745 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
2746 fileno = blkno = at_sm = 0;
2747 break;
2748 case MTEOM:
2749 if (!STp->fast_mteom) {
2750 /* space to the end of tape */
2751 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2752 fileno = STps->drv_file;
2753 if (STps->eof >= ST_EOD_1)
2754 return 0;
2755 /* The next lines would hide the number of spaced FileMarks
2756 That's why I inserted the previous lines. I had no luck
2757 with detecting EOM with FSF, so we go now to EOM.
2758 Joerg Weule */
2759 } else
2760 fileno = (-1);
2761 cmd[0] = SPACE;
2762 cmd[1] = 3;
2763 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
2764 name));
2765 blkno = -1;
2766 at_sm = 0;
2767 break;
2768 case MTERASE:
2769 if (STp->write_prot)
2770 return (-EACCES);
2771 cmd[0] = ERASE;
2772 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2773 if (STp->immediate) {
2774 cmd[1] |= 2; /* Don't wait for completion */
2775 timeout = STp->device->request_queue->rq_timeout;
2776 }
2777 else
2778 timeout = STp->long_timeout * 8;
2779
2780 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name));
2781 fileno = blkno = at_sm = 0;
2782 break;
2783 case MTSETBLK: /* Set block length */
2784 case MTSETDENSITY: /* Set tape density */
2785 case MTSETDRVBUFFER: /* Set drive buffering */
2786 case SET_DENS_AND_BLK: /* Set density and block size */
2787 chg_eof = 0;
2788 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2789 return (-EIO); /* Not allowed if data in buffer */
2790 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2791 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2792 STp->max_block > 0 &&
2793 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2794 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2795 printk(KERN_WARNING "%s: Illegal block size.\n", name);
2796 return (-EINVAL);
2797 }
2798 cmd[0] = MODE_SELECT;
2799 if ((STp->use_pf & USE_PF))
2800 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2801 cmd[4] = datalen = 12;
2802 direction = DMA_TO_DEVICE;
2803
2804 memset((STp->buffer)->b_data, 0, 12);
2805 if (cmd_in == MTSETDRVBUFFER)
2806 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2807 else
2808 (STp->buffer)->b_data[2] =
2809 STp->drv_buffer << 4;
2810 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2811 if (cmd_in == MTSETDENSITY) {
2812 (STp->buffer)->b_data[4] = arg;
2813 STp->density_changed = 1; /* At least we tried ;-) */
2814 } else if (cmd_in == SET_DENS_AND_BLK)
2815 (STp->buffer)->b_data[4] = arg >> 24;
2816 else
2817 (STp->buffer)->b_data[4] = STp->density;
2818 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2819 ltmp = arg & MT_ST_BLKSIZE_MASK;
2820 if (cmd_in == MTSETBLK)
2821 STp->blksize_changed = 1; /* At least we tried ;-) */
2822 } else
2823 ltmp = STp->block_size;
2824 (STp->buffer)->b_data[9] = (ltmp >> 16);
2825 (STp->buffer)->b_data[10] = (ltmp >> 8);
2826 (STp->buffer)->b_data[11] = ltmp;
2827 timeout = STp->device->request_queue->rq_timeout;
2828 DEBC(
2829 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2830 printk(ST_DEB_MSG
2831 "%s: Setting block size to %d bytes.\n", name,
2832 (STp->buffer)->b_data[9] * 65536 +
2833 (STp->buffer)->b_data[10] * 256 +
2834 (STp->buffer)->b_data[11]);
2835 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2836 printk(ST_DEB_MSG
2837 "%s: Setting density code to %x.\n", name,
2838 (STp->buffer)->b_data[4]);
2839 if (cmd_in == MTSETDRVBUFFER)
2840 printk(ST_DEB_MSG
2841 "%s: Setting drive buffer code to %d.\n", name,
2842 ((STp->buffer)->b_data[2] >> 4) & 7);
2843 )
2844 break;
2845 default:
2846 return (-ENOSYS);
2847 }
2848
2849 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2850 timeout, MAX_RETRIES, 1);
2851 if (!SRpnt)
2852 return (STp->buffer)->syscall_result;
2853
2854 ioctl_result = (STp->buffer)->syscall_result;
2855
2856 if (!ioctl_result) { /* SCSI command successful */
2857 st_release_request(SRpnt);
2858 SRpnt = NULL;
2859 STps->drv_block = blkno;
2860 STps->drv_file = fileno;
2861 STps->at_sm = at_sm;
2862
2863 if (cmd_in == MTBSFM)
2864 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2865 else if (cmd_in == MTFSFM)
2866 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2867
2868 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2869 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2870 if (STp->block_size != 0) {
2871 (STp->buffer)->buffer_blocks =
2872 (STp->buffer)->buffer_size / STp->block_size;
2873 }
2874 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2875 if (cmd_in == SET_DENS_AND_BLK)
2876 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2877 } else if (cmd_in == MTSETDRVBUFFER)
2878 STp->drv_buffer = (arg & 7);
2879 else if (cmd_in == MTSETDENSITY)
2880 STp->density = arg;
2881
2882 if (cmd_in == MTEOM)
2883 STps->eof = ST_EOD;
2884 else if (cmd_in == MTFSF)
2885 STps->eof = ST_FM;
2886 else if (chg_eof)
2887 STps->eof = ST_NOEOF;
2888
2889 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2890 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2891 } else { /* SCSI command was not completely successful. Don't return
2892 from this block without releasing the SCSI command block! */
2893 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
2894
2895 if (cmdstatp->flags & SENSE_EOM) {
2896 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
2897 cmd_in != MTBSR && cmd_in != MTBSS)
2898 STps->eof = ST_EOM_OK;
2899 STps->drv_block = 0;
2900 }
2901
2902 if (cmdstatp->remainder_valid)
2903 undone = (int)cmdstatp->uremainder64;
2904 else
2905 undone = 0;
2906
2907 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
2908 cmdstatp->have_sense &&
2909 (cmdstatp->flags & SENSE_EOM)) {
2910 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
2911 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
2912 ioctl_result = 0; /* EOF(s) written successfully at EOM */
2913 STps->eof = ST_NOEOF;
2914 } else { /* Writing EOF(s) failed */
2915 if (fileno >= 0)
2916 fileno -= undone;
2917 if (undone < arg)
2918 STps->eof = ST_NOEOF;
2919 }
2920 STps->drv_file = fileno;
2921 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
2922 if (fileno >= 0)
2923 STps->drv_file = fileno - undone;
2924 else
2925 STps->drv_file = fileno;
2926 STps->drv_block = -1;
2927 STps->eof = ST_NOEOF;
2928 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
2929 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2930 undone = (-undone);
2931 if (STps->drv_file >= 0)
2932 STps->drv_file = fileno + undone;
2933 STps->drv_block = 0;
2934 STps->eof = ST_NOEOF;
2935 } else if (cmd_in == MTFSR) {
2936 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2937 if (STps->drv_file >= 0)
2938 STps->drv_file++;
2939 STps->drv_block = 0;
2940 STps->eof = ST_FM;
2941 } else {
2942 if (blkno >= undone)
2943 STps->drv_block = blkno - undone;
2944 else
2945 STps->drv_block = (-1);
2946 STps->eof = ST_NOEOF;
2947 }
2948 } else if (cmd_in == MTBSR) {
2949 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
2950 STps->drv_file--;
2951 STps->drv_block = (-1);
2952 } else {
2953 if (arg > 0 && undone < 0) /* Some drives get this wrong */
2954 undone = (-undone);
2955 if (STps->drv_block >= 0)
2956 STps->drv_block = blkno + undone;
2957 }
2958 STps->eof = ST_NOEOF;
2959 } else if (cmd_in == MTEOM) {
2960 STps->drv_file = (-1);
2961 STps->drv_block = (-1);
2962 STps->eof = ST_EOD;
2963 } else if (cmd_in == MTSETBLK ||
2964 cmd_in == MTSETDENSITY ||
2965 cmd_in == MTSETDRVBUFFER ||
2966 cmd_in == SET_DENS_AND_BLK) {
2967 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
2968 !(STp->use_pf & PF_TESTED)) {
2969 /* Try the other possible state of Page Format if not
2970 already tried */
2971 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
2972 st_release_request(SRpnt);
2973 SRpnt = NULL;
2974 return st_int_ioctl(STp, cmd_in, arg);
2975 }
2976 } else if (chg_eof)
2977 STps->eof = ST_NOEOF;
2978
2979 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
2980 STps->eof = ST_EOD;
2981
2982 st_release_request(SRpnt);
2983 SRpnt = NULL;
2984 }
2985
2986 return ioctl_result;
2987}
2988
2989
2990/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
2991 structure. */
2992
2993static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
2994 int logical)
2995{
2996 int result;
2997 unsigned char scmd[MAX_COMMAND_SIZE];
2998 struct st_request *SRpnt;
2999 DEB( char *name = tape_name(STp); )
3000
3001 if (STp->ready != ST_READY)
3002 return (-EIO);
3003
3004 memset(scmd, 0, MAX_COMMAND_SIZE);
3005 if ((STp->device)->scsi_level < SCSI_2) {
3006 scmd[0] = QFA_REQUEST_BLOCK;
3007 scmd[4] = 3;
3008 } else {
3009 scmd[0] = READ_POSITION;
3010 if (!logical && !STp->scsi2_logical)
3011 scmd[1] = 1;
3012 }
3013 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3014 STp->device->request_queue->rq_timeout,
3015 MAX_READY_RETRIES, 1);
3016 if (!SRpnt)
3017 return (STp->buffer)->syscall_result;
3018
3019 if ((STp->buffer)->syscall_result != 0 ||
3020 (STp->device->scsi_level >= SCSI_2 &&
3021 ((STp->buffer)->b_data[0] & 4) != 0)) {
3022 *block = *partition = 0;
3023 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name));
3024 result = (-EIO);
3025 } else {
3026 result = 0;
3027 if ((STp->device)->scsi_level < SCSI_2) {
3028 *block = ((STp->buffer)->b_data[0] << 16)
3029 + ((STp->buffer)->b_data[1] << 8)
3030 + (STp->buffer)->b_data[2];
3031 *partition = 0;
3032 } else {
3033 *block = ((STp->buffer)->b_data[4] << 24)
3034 + ((STp->buffer)->b_data[5] << 16)
3035 + ((STp->buffer)->b_data[6] << 8)
3036 + (STp->buffer)->b_data[7];
3037 *partition = (STp->buffer)->b_data[1];
3038 if (((STp->buffer)->b_data[0] & 0x80) &&
3039 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3040 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3041 }
3042 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
3043 *block, *partition));
3044 }
3045 st_release_request(SRpnt);
3046 SRpnt = NULL;
3047
3048 return result;
3049}
3050
3051
3052/* Set the tape block and partition. Negative partition means that only the
3053 block should be set in vendor specific way. */
3054static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3055 int logical)
3056{
3057 struct st_partstat *STps;
3058 int result, p;
3059 unsigned int blk;
3060 int timeout;
3061 unsigned char scmd[MAX_COMMAND_SIZE];
3062 struct st_request *SRpnt;
3063 DEB( char *name = tape_name(STp); )
3064
3065 if (STp->ready != ST_READY)
3066 return (-EIO);
3067 timeout = STp->long_timeout;
3068 STps = &(STp->ps[STp->partition]);
3069
3070 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n",
3071 name, block, partition));
3072 DEB(if (partition < 0)
3073 return (-EIO); )
3074
3075 /* Update the location at the partition we are leaving */
3076 if ((!STp->can_partitions && partition != 0) ||
3077 partition >= ST_NBR_PARTITIONS)
3078 return (-EINVAL);
3079 if (partition != STp->partition) {
3080 if (get_location(STp, &blk, &p, 1))
3081 STps->last_block_valid = 0;
3082 else {
3083 STps->last_block_valid = 1;
3084 STps->last_block_visited = blk;
3085 DEBC(printk(ST_DEB_MSG
3086 "%s: Visited block %d for partition %d saved.\n",
3087 name, blk, STp->partition));
3088 }
3089 }
3090
3091 memset(scmd, 0, MAX_COMMAND_SIZE);
3092 if ((STp->device)->scsi_level < SCSI_2) {
3093 scmd[0] = QFA_SEEK_BLOCK;
3094 scmd[2] = (block >> 16);
3095 scmd[3] = (block >> 8);
3096 scmd[4] = block;
3097 scmd[5] = 0;
3098 } else {
3099 scmd[0] = SEEK_10;
3100 scmd[3] = (block >> 24);
3101 scmd[4] = (block >> 16);
3102 scmd[5] = (block >> 8);
3103 scmd[6] = block;
3104 if (!logical && !STp->scsi2_logical)
3105 scmd[1] = 4;
3106 if (STp->partition != partition) {
3107 scmd[1] |= 2;
3108 scmd[8] = partition;
3109 DEBC(printk(ST_DEB_MSG
3110 "%s: Trying to change partition from %d to %d\n",
3111 name, STp->partition, partition));
3112 }
3113 }
3114 if (STp->immediate) {
3115 scmd[1] |= 1; /* Don't wait for completion */
3116 timeout = STp->device->request_queue->rq_timeout;
3117 }
3118
3119 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3120 timeout, MAX_READY_RETRIES, 1);
3121 if (!SRpnt)
3122 return (STp->buffer)->syscall_result;
3123
3124 STps->drv_block = STps->drv_file = (-1);
3125 STps->eof = ST_NOEOF;
3126 if ((STp->buffer)->syscall_result != 0) {
3127 result = (-EIO);
3128 if (STp->can_partitions &&
3129 (STp->device)->scsi_level >= SCSI_2 &&
3130 (p = find_partition(STp)) >= 0)
3131 STp->partition = p;
3132 } else {
3133 if (STp->can_partitions) {
3134 STp->partition = partition;
3135 STps = &(STp->ps[partition]);
3136 if (!STps->last_block_valid ||
3137 STps->last_block_visited != block) {
3138 STps->at_sm = 0;
3139 STps->rw = ST_IDLE;
3140 }
3141 } else
3142 STps->at_sm = 0;
3143 if (block == 0)
3144 STps->drv_block = STps->drv_file = 0;
3145 result = 0;
3146 }
3147
3148 st_release_request(SRpnt);
3149 SRpnt = NULL;
3150
3151 return result;
3152}
3153
3154
3155/* Find the current partition number for the drive status. Called from open and
3156 returns either partition number of negative error code. */
3157static int find_partition(struct scsi_tape *STp)
3158{
3159 int i, partition;
3160 unsigned int block;
3161
3162 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3163 return i;
3164 if (partition >= ST_NBR_PARTITIONS)
3165 return (-EIO);
3166 return partition;
3167}
3168
3169
3170/* Change the partition if necessary */
3171static int switch_partition(struct scsi_tape *STp)
3172{
3173 struct st_partstat *STps;
3174
3175 if (STp->partition == STp->new_partition)
3176 return 0;
3177 STps = &(STp->ps[STp->new_partition]);
3178 if (!STps->last_block_valid)
3179 STps->last_block_visited = 0;
3180 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3181}
3182
3183/* Functions for reading and writing the medium partition mode page. */
3184
3185#define PART_PAGE 0x11
3186#define PART_PAGE_FIXED_LENGTH 8
3187
3188#define PP_OFF_MAX_ADD_PARTS 2
3189#define PP_OFF_NBR_ADD_PARTS 3
3190#define PP_OFF_FLAGS 4
3191#define PP_OFF_PART_UNITS 6
3192#define PP_OFF_RESERVED 7
3193
3194#define PP_BIT_IDP 0x20
3195#define PP_MSK_PSUM_MB 0x10
3196
3197/* Get the number of partitions on the tape. As a side effect reads the
3198 mode page into the tape buffer. */
3199static int nbr_partitions(struct scsi_tape *STp)
3200{
3201 int result;
3202 DEB( char *name = tape_name(STp); )
3203
3204 if (STp->ready != ST_READY)
3205 return (-EIO);
3206
3207 result = read_mode_page(STp, PART_PAGE, 1);
3208
3209 if (result) {
3210 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n",
3211 name));
3212 result = (-EIO);
3213 } else {
3214 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3215 PP_OFF_NBR_ADD_PARTS] + 1;
3216 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result));
3217 }
3218
3219 return result;
3220}
3221
3222
3223/* Partition the tape into two partitions if size > 0 or one partition if
3224 size == 0.
3225
3226 The block descriptors are read and written because Sony SDT-7000 does not
3227 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3228
3229 My HP C1533A drive returns only one partition size field. This is used to
3230 set the size of partition 1. There is no size field for the default partition.
3231 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3232 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3233 The following algorithm is used to accommodate both drives: if the number of
3234 partition size fields is greater than the maximum number of additional partitions
3235 in the mode page, the second field is used. Otherwise the first field is used.
3236
3237 For Seagate DDS drives the page length must be 8 when no partitions is defined
3238 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3239 is acceptable also to some other old drives and enforced if the first partition
3240 size field is used for the first additional partition size.
3241 */
3242static int partition_tape(struct scsi_tape *STp, int size)
3243{
3244 char *name = tape_name(STp);
3245 int result;
3246 int pgo, psd_cnt, psdo;
3247 unsigned char *bp;
3248
3249 result = read_mode_page(STp, PART_PAGE, 0);
3250 if (result) {
3251 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name));
3252 return result;
3253 }
3254 /* The mode page is in the buffer. Let's modify it and write it. */
3255 bp = (STp->buffer)->b_data;
3256 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3257 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n",
3258 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2));
3259
3260 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3261 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3262 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3263 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3264 psdo += 2;
3265 }
3266 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3267
3268 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name,
3269 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3270 bp[pgo + PP_OFF_NBR_ADD_PARTS]));
3271
3272 if (size <= 0) {
3273 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3274 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3275 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3276 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n",
3277 name));
3278 } else {
3279 bp[psdo] = (size >> 8) & 0xff;
3280 bp[psdo + 1] = size & 0xff;
3281 bp[pgo + 3] = 1;
3282 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3283 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3284 DEBC(printk(ST_DEB_MSG
3285 "%s: Formatting tape with two partitions (1 = %d MB).\n",
3286 name, size));
3287 }
3288 bp[pgo + PP_OFF_PART_UNITS] = 0;
3289 bp[pgo + PP_OFF_RESERVED] = 0;
3290 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3291
3292 result = write_mode_page(STp, PART_PAGE, 1);
3293 if (result) {
3294 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name);
3295 result = (-EIO);
3296 }
3297
3298 return result;
3299}
3300
3301
3302
3303/* The ioctl command */
3304static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3305{
3306 int i, cmd_nr, cmd_type, bt;
3307 int retval = 0;
3308 unsigned int blk;
3309 struct scsi_tape *STp = file->private_data;
3310 struct st_modedef *STm;
3311 struct st_partstat *STps;
3312 char *name = tape_name(STp);
3313 void __user *p = (void __user *)arg;
3314
3315 if (mutex_lock_interruptible(&STp->lock))
3316 return -ERESTARTSYS;
3317
3318 DEB(
3319 if (debugging && !STp->in_use) {
3320 printk(ST_DEB_MSG "%s: Incorrect device.\n", name);
3321 retval = (-EIO);
3322 goto out;
3323 } ) /* end DEB */
3324
3325 STm = &(STp->modes[STp->current_mode]);
3326 STps = &(STp->ps[STp->partition]);
3327
3328 /*
3329 * If we are in the middle of error recovery, don't let anyone
3330 * else try and use this device. Also, if error recovery fails, it
3331 * may try and take the device offline, in which case all further
3332 * access to the device is prohibited.
3333 */
3334 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
3335 file->f_flags & O_NDELAY);
3336 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
3337 goto out;
3338 retval = 0;
3339
3340 cmd_type = _IOC_TYPE(cmd_in);
3341 cmd_nr = _IOC_NR(cmd_in);
3342
3343 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3344 struct mtop mtc;
3345
3346 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3347 retval = (-EINVAL);
3348 goto out;
3349 }
3350
3351 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3352 if (i) {
3353 retval = (-EFAULT);
3354 goto out;
3355 }
3356
3357 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3358 printk(KERN_WARNING
3359 "%s: MTSETDRVBUFFER only allowed for root.\n", name);
3360 retval = (-EPERM);
3361 goto out;
3362 }
3363 if (!STm->defined &&
3364 (mtc.mt_op != MTSETDRVBUFFER &&
3365 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3366 retval = (-ENXIO);
3367 goto out;
3368 }
3369
3370 if (!STp->pos_unknown) {
3371
3372 if (STps->eof == ST_FM_HIT) {
3373 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3374 mtc.mt_op == MTEOM) {
3375 mtc.mt_count -= 1;
3376 if (STps->drv_file >= 0)
3377 STps->drv_file += 1;
3378 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3379 mtc.mt_count += 1;
3380 if (STps->drv_file >= 0)
3381 STps->drv_file += 1;
3382 }
3383 }
3384
3385 if (mtc.mt_op == MTSEEK) {
3386 /* Old position must be restored if partition will be
3387 changed */
3388 i = !STp->can_partitions ||
3389 (STp->new_partition != STp->partition);
3390 } else {
3391 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3392 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3393 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3394 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3395 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3396 mtc.mt_op == MTCOMPRESSION;
3397 }
3398 i = flush_buffer(STp, i);
3399 if (i < 0) {
3400 retval = i;
3401 goto out;
3402 }
3403 if (STps->rw == ST_WRITING &&
3404 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3405 mtc.mt_op == MTSEEK ||
3406 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3407 i = st_int_ioctl(STp, MTWEOF, 1);
3408 if (i < 0) {
3409 retval = i;
3410 goto out;
3411 }
3412 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3413 mtc.mt_count++;
3414 STps->rw = ST_IDLE;
3415 }
3416
3417 } else {
3418 /*
3419 * If there was a bus reset, block further access
3420 * to this device. If the user wants to rewind the tape,
3421 * then reset the flag and allow access again.
3422 */
3423 if (mtc.mt_op != MTREW &&
3424 mtc.mt_op != MTOFFL &&
3425 mtc.mt_op != MTRETEN &&
3426 mtc.mt_op != MTERASE &&
3427 mtc.mt_op != MTSEEK &&
3428 mtc.mt_op != MTEOM) {
3429 retval = (-EIO);
3430 goto out;
3431 }
3432 reset_state(STp);
3433 /* remove this when the midlevel properly clears was_reset */
3434 STp->device->was_reset = 0;
3435 }
3436
3437 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3438 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3439 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3440 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3441
3442 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3443 do_door_lock(STp, 0); /* Ignore result! */
3444
3445 if (mtc.mt_op == MTSETDRVBUFFER &&
3446 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3447 retval = st_set_options(STp, mtc.mt_count);
3448 goto out;
3449 }
3450
3451 if (mtc.mt_op == MTSETPART) {
3452 if (!STp->can_partitions ||
3453 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3454 retval = (-EINVAL);
3455 goto out;
3456 }
3457 if (mtc.mt_count >= STp->nbr_partitions &&
3458 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3459 retval = (-EIO);
3460 goto out;
3461 }
3462 if (mtc.mt_count >= STp->nbr_partitions) {
3463 retval = (-EINVAL);
3464 goto out;
3465 }
3466 STp->new_partition = mtc.mt_count;
3467 retval = 0;
3468 goto out;
3469 }
3470
3471 if (mtc.mt_op == MTMKPART) {
3472 if (!STp->can_partitions) {
3473 retval = (-EINVAL);
3474 goto out;
3475 }
3476 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3477 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3478 retval = i;
3479 goto out;
3480 }
3481 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3482 STp->ps[i].rw = ST_IDLE;
3483 STp->ps[i].at_sm = 0;
3484 STp->ps[i].last_block_valid = 0;
3485 }
3486 STp->partition = STp->new_partition = 0;
3487 STp->nbr_partitions = 1; /* Bad guess ?-) */
3488 STps->drv_block = STps->drv_file = 0;
3489 retval = 0;
3490 goto out;
3491 }
3492
3493 if (mtc.mt_op == MTSEEK) {
3494 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3495 if (!STp->can_partitions)
3496 STp->ps[0].rw = ST_IDLE;
3497 retval = i;
3498 goto out;
3499 }
3500
3501 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3502 retval = do_load_unload(STp, file, 0);
3503 goto out;
3504 }
3505
3506 if (mtc.mt_op == MTLOAD) {
3507 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3508 goto out;
3509 }
3510
3511 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3512 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3513 goto out;
3514 }
3515
3516 if (STp->can_partitions && STp->ready == ST_READY &&
3517 (i = switch_partition(STp)) < 0) {
3518 retval = i;
3519 goto out;
3520 }
3521
3522 if (mtc.mt_op == MTCOMPRESSION)
3523 retval = st_compression(STp, (mtc.mt_count & 1));
3524 else
3525 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3526 goto out;
3527 }
3528 if (!STm->defined) {
3529 retval = (-ENXIO);
3530 goto out;
3531 }
3532
3533 if ((i = flush_buffer(STp, 0)) < 0) {
3534 retval = i;
3535 goto out;
3536 }
3537 if (STp->can_partitions &&
3538 (i = switch_partition(STp)) < 0) {
3539 retval = i;
3540 goto out;
3541 }
3542
3543 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3544 struct mtget mt_status;
3545
3546 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3547 retval = (-EINVAL);
3548 goto out;
3549 }
3550
3551 mt_status.mt_type = STp->tape_type;
3552 mt_status.mt_dsreg =
3553 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3554 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3555 mt_status.mt_blkno = STps->drv_block;
3556 mt_status.mt_fileno = STps->drv_file;
3557 if (STp->block_size != 0) {
3558 if (STps->rw == ST_WRITING)
3559 mt_status.mt_blkno +=
3560 (STp->buffer)->buffer_bytes / STp->block_size;
3561 else if (STps->rw == ST_READING)
3562 mt_status.mt_blkno -=
3563 ((STp->buffer)->buffer_bytes +
3564 STp->block_size - 1) / STp->block_size;
3565 }
3566
3567 mt_status.mt_gstat = 0;
3568 if (STp->drv_write_prot)
3569 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3570 if (mt_status.mt_blkno == 0) {
3571 if (mt_status.mt_fileno == 0)
3572 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3573 else
3574 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3575 }
3576 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3577 mt_status.mt_resid = STp->partition;
3578 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3579 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3580 else if (STps->eof >= ST_EOM_OK)
3581 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3582 if (STp->density == 1)
3583 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3584 else if (STp->density == 2)
3585 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3586 else if (STp->density == 3)
3587 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3588 if (STp->ready == ST_READY)
3589 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3590 if (STp->ready == ST_NO_TAPE)
3591 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3592 if (STps->at_sm)
3593 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3594 if (STm->do_async_writes ||
3595 (STm->do_buffer_writes && STp->block_size != 0) ||
3596 STp->drv_buffer != 0)
3597 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3598 if (STp->cleaning_req)
3599 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3600
3601 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3602 if (i) {
3603 retval = (-EFAULT);
3604 goto out;
3605 }
3606
3607 STp->recover_reg = 0; /* Clear after read */
3608 retval = 0;
3609 goto out;
3610 } /* End of MTIOCGET */
3611 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3612 struct mtpos mt_pos;
3613 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3614 retval = (-EINVAL);
3615 goto out;
3616 }
3617 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3618 retval = i;
3619 goto out;
3620 }
3621 mt_pos.mt_blkno = blk;
3622 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3623 if (i)
3624 retval = (-EFAULT);
3625 goto out;
3626 }
3627 mutex_unlock(&STp->lock);
3628 switch (cmd_in) {
3629 case SCSI_IOCTL_GET_IDLUN:
3630 case SCSI_IOCTL_GET_BUS_NUMBER:
3631 break;
3632 default:
3633 if ((cmd_in == SG_IO ||
3634 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3635 cmd_in == CDROM_SEND_PACKET) &&
3636 !capable(CAP_SYS_RAWIO))
3637 i = -EPERM;
3638 else
3639 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3640 file->f_mode, cmd_in, p);
3641 if (i != -ENOTTY)
3642 return i;
3643 break;
3644 }
3645 retval = scsi_ioctl(STp->device, cmd_in, p);
3646 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3647 STp->rew_at_close = 0;
3648 STp->ready = ST_NO_TAPE;
3649 }
3650 return retval;
3651
3652 out:
3653 mutex_unlock(&STp->lock);
3654 return retval;
3655}
3656
3657#ifdef CONFIG_COMPAT
3658static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3659{
3660 struct scsi_tape *STp = file->private_data;
3661 struct scsi_device *sdev = STp->device;
3662 int ret = -ENOIOCTLCMD;
3663 if (sdev->host->hostt->compat_ioctl) {
3664
3665 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3666
3667 }
3668 return ret;
3669}
3670#endif
3671
3672
3673
3674/* Try to allocate a new tape buffer. Calling function must not hold
3675 dev_arr_lock. */
3676static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3677{
3678 struct st_buffer *tb;
3679
3680 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3681 if (!tb) {
3682 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3683 return NULL;
3684 }
3685 tb->frp_segs = 0;
3686 tb->use_sg = max_sg;
3687 tb->dma = need_dma;
3688 tb->buffer_size = 0;
3689
3690 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3691 GFP_ATOMIC);
3692 if (!tb->reserved_pages) {
3693 kfree(tb);
3694 return NULL;
3695 }
3696
3697 return tb;
3698}
3699
3700
3701/* Try to allocate enough space in the tape buffer */
3702#define ST_MAX_ORDER 6
3703
3704static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3705{
3706 int segs, nbr, max_segs, b_size, order, got;
3707 gfp_t priority;
3708
3709 if (new_size <= STbuffer->buffer_size)
3710 return 1;
3711
3712 if (STbuffer->buffer_size <= PAGE_SIZE)
3713 normalize_buffer(STbuffer); /* Avoid extra segment */
3714
3715 max_segs = STbuffer->use_sg;
3716 nbr = max_segs - STbuffer->frp_segs;
3717 if (nbr <= 0)
3718 return 0;
3719
3720 priority = GFP_KERNEL | __GFP_NOWARN;
3721 if (need_dma)
3722 priority |= GFP_DMA;
3723
3724 if (STbuffer->cleared)
3725 priority |= __GFP_ZERO;
3726
3727 if (STbuffer->frp_segs) {
3728 order = STbuffer->reserved_page_order;
3729 b_size = PAGE_SIZE << order;
3730 } else {
3731 for (b_size = PAGE_SIZE, order = 0;
3732 order < ST_MAX_ORDER &&
3733 max_segs * (PAGE_SIZE << order) < new_size;
3734 order++, b_size *= 2)
3735 ; /* empty */
3736 STbuffer->reserved_page_order = order;
3737 }
3738 if (max_segs * (PAGE_SIZE << order) < new_size) {
3739 if (order == ST_MAX_ORDER)
3740 return 0;
3741 normalize_buffer(STbuffer);
3742 return enlarge_buffer(STbuffer, new_size, need_dma);
3743 }
3744
3745 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3746 segs < max_segs && got < new_size;) {
3747 struct page *page;
3748
3749 page = alloc_pages(priority, order);
3750 if (!page) {
3751 DEB(STbuffer->buffer_size = got);
3752 normalize_buffer(STbuffer);
3753 return 0;
3754 }
3755
3756 STbuffer->frp_segs += 1;
3757 got += b_size;
3758 STbuffer->buffer_size = got;
3759 STbuffer->reserved_pages[segs] = page;
3760 segs++;
3761 }
3762 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3763
3764 return 1;
3765}
3766
3767
3768/* Make sure that no data from previous user is in the internal buffer */
3769static void clear_buffer(struct st_buffer * st_bp)
3770{
3771 int i;
3772
3773 for (i=0; i < st_bp->frp_segs; i++)
3774 memset(page_address(st_bp->reserved_pages[i]), 0,
3775 PAGE_SIZE << st_bp->reserved_page_order);
3776 st_bp->cleared = 1;
3777}
3778
3779
3780/* Release the extra buffer */
3781static void normalize_buffer(struct st_buffer * STbuffer)
3782{
3783 int i, order = STbuffer->reserved_page_order;
3784
3785 for (i = 0; i < STbuffer->frp_segs; i++) {
3786 __free_pages(STbuffer->reserved_pages[i], order);
3787 STbuffer->buffer_size -= (PAGE_SIZE << order);
3788 }
3789 STbuffer->frp_segs = 0;
3790 STbuffer->sg_segs = 0;
3791 STbuffer->reserved_page_order = 0;
3792 STbuffer->map_data.offset = 0;
3793}
3794
3795
3796/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3797 negative error code. */
3798static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3799{
3800 int i, cnt, res, offset;
3801 int length = PAGE_SIZE << st_bp->reserved_page_order;
3802
3803 for (i = 0, offset = st_bp->buffer_bytes;
3804 i < st_bp->frp_segs && offset >= length; i++)
3805 offset -= length;
3806 if (i == st_bp->frp_segs) { /* Should never happen */
3807 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3808 return (-EIO);
3809 }
3810 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3811 struct page *page = st_bp->reserved_pages[i];
3812 cnt = length - offset < do_count ? length - offset : do_count;
3813 res = copy_from_user(page_address(page) + offset, ubp, cnt);
3814 if (res)
3815 return (-EFAULT);
3816 do_count -= cnt;
3817 st_bp->buffer_bytes += cnt;
3818 ubp += cnt;
3819 offset = 0;
3820 }
3821 if (do_count) /* Should never happen */
3822 return (-EIO);
3823
3824 return 0;
3825}
3826
3827
3828/* Move data from the tape buffer to the user buffer. Returns zero (success) or
3829 negative error code. */
3830static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3831{
3832 int i, cnt, res, offset;
3833 int length = PAGE_SIZE << st_bp->reserved_page_order;
3834
3835 for (i = 0, offset = st_bp->read_pointer;
3836 i < st_bp->frp_segs && offset >= length; i++)
3837 offset -= length;
3838 if (i == st_bp->frp_segs) { /* Should never happen */
3839 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3840 return (-EIO);
3841 }
3842 for (; i < st_bp->frp_segs && do_count > 0; i++) {
3843 struct page *page = st_bp->reserved_pages[i];
3844 cnt = length - offset < do_count ? length - offset : do_count;
3845 res = copy_to_user(ubp, page_address(page) + offset, cnt);
3846 if (res)
3847 return (-EFAULT);
3848 do_count -= cnt;
3849 st_bp->buffer_bytes -= cnt;
3850 st_bp->read_pointer += cnt;
3851 ubp += cnt;
3852 offset = 0;
3853 }
3854 if (do_count) /* Should never happen */
3855 return (-EIO);
3856
3857 return 0;
3858}
3859
3860
3861/* Move data towards start of buffer */
3862static void move_buffer_data(struct st_buffer * st_bp, int offset)
3863{
3864 int src_seg, dst_seg, src_offset = 0, dst_offset;
3865 int count, total;
3866 int length = PAGE_SIZE << st_bp->reserved_page_order;
3867
3868 if (offset == 0)
3869 return;
3870
3871 total=st_bp->buffer_bytes - offset;
3872 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3873 src_offset = offset;
3874 if (src_offset < length)
3875 break;
3876 offset -= length;
3877 }
3878
3879 st_bp->buffer_bytes = st_bp->read_pointer = total;
3880 for (dst_seg=dst_offset=0; total > 0; ) {
3881 struct page *dpage = st_bp->reserved_pages[dst_seg];
3882 struct page *spage = st_bp->reserved_pages[src_seg];
3883
3884 count = min(length - dst_offset, length - src_offset);
3885 memmove(page_address(dpage) + dst_offset,
3886 page_address(spage) + src_offset, count);
3887 src_offset += count;
3888 if (src_offset >= length) {
3889 src_seg++;
3890 src_offset = 0;
3891 }
3892 dst_offset += count;
3893 if (dst_offset >= length) {
3894 dst_seg++;
3895 dst_offset = 0;
3896 }
3897 total -= count;
3898 }
3899}
3900
3901/* Validate the options from command line or module parameters */
3902static void validate_options(void)
3903{
3904 if (buffer_kbs > 0)
3905 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
3906 if (max_sg_segs >= ST_FIRST_SG)
3907 st_max_sg_segs = max_sg_segs;
3908}
3909
3910#ifndef MODULE
3911/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
3912 */
3913static int __init st_setup(char *str)
3914{
3915 int i, len, ints[5];
3916 char *stp;
3917
3918 stp = get_options(str, ARRAY_SIZE(ints), ints);
3919
3920 if (ints[0] > 0) {
3921 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
3922 if (parms[i].val)
3923 *parms[i].val = ints[i + 1];
3924 } else {
3925 while (stp != NULL) {
3926 for (i = 0; i < ARRAY_SIZE(parms); i++) {
3927 len = strlen(parms[i].name);
3928 if (!strncmp(stp, parms[i].name, len) &&
3929 (*(stp + len) == ':' || *(stp + len) == '=')) {
3930 if (parms[i].val)
3931 *parms[i].val =
3932 simple_strtoul(stp + len + 1, NULL, 0);
3933 else
3934 printk(KERN_WARNING "st: Obsolete parameter %s\n",
3935 parms[i].name);
3936 break;
3937 }
3938 }
3939 if (i >= ARRAY_SIZE(parms))
3940 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
3941 stp);
3942 stp = strchr(stp, ',');
3943 if (stp)
3944 stp++;
3945 }
3946 }
3947
3948 validate_options();
3949
3950 return 1;
3951}
3952
3953__setup("st=", st_setup);
3954
3955#endif
3956
3957static const struct file_operations st_fops =
3958{
3959 .owner = THIS_MODULE,
3960 .read = st_read,
3961 .write = st_write,
3962 .unlocked_ioctl = st_ioctl,
3963#ifdef CONFIG_COMPAT
3964 .compat_ioctl = st_compat_ioctl,
3965#endif
3966 .open = st_open,
3967 .flush = st_flush,
3968 .release = st_release,
3969 .llseek = noop_llseek,
3970};
3971
3972static int st_probe(struct device *dev)
3973{
3974 struct scsi_device *SDp = to_scsi_device(dev);
3975 struct gendisk *disk = NULL;
3976 struct cdev *cdev = NULL;
3977 struct scsi_tape *tpnt = NULL;
3978 struct st_modedef *STm;
3979 struct st_partstat *STps;
3980 struct st_buffer *buffer;
3981 int i, j, mode, dev_num, error;
3982 char *stp;
3983
3984 if (SDp->type != TYPE_TAPE)
3985 return -ENODEV;
3986 if ((stp = st_incompatible(SDp))) {
3987 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
3988 printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
3989 return -ENODEV;
3990 }
3991
3992 i = queue_max_segments(SDp->request_queue);
3993 if (st_max_sg_segs < i)
3994 i = st_max_sg_segs;
3995 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
3996 if (buffer == NULL) {
3997 printk(KERN_ERR
3998 "st: Can't allocate new tape buffer. Device not attached.\n");
3999 goto out;
4000 }
4001
4002 disk = alloc_disk(1);
4003 if (!disk) {
4004 printk(KERN_ERR "st: out of memory. Device not attached.\n");
4005 goto out_buffer_free;
4006 }
4007
4008 write_lock(&st_dev_arr_lock);
4009 if (st_nr_dev >= st_dev_max) {
4010 struct scsi_tape **tmp_da;
4011 int tmp_dev_max;
4012
4013 tmp_dev_max = max(st_nr_dev * 2, 8);
4014 if (tmp_dev_max > ST_MAX_TAPES)
4015 tmp_dev_max = ST_MAX_TAPES;
4016 if (tmp_dev_max <= st_nr_dev) {
4017 write_unlock(&st_dev_arr_lock);
4018 printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
4019 ST_MAX_TAPES);
4020 goto out_put_disk;
4021 }
4022
4023 tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
4024 if (tmp_da == NULL) {
4025 write_unlock(&st_dev_arr_lock);
4026 printk(KERN_ERR "st: Can't extend device array.\n");
4027 goto out_put_disk;
4028 }
4029
4030 if (scsi_tapes != NULL) {
4031 memcpy(tmp_da, scsi_tapes,
4032 st_dev_max * sizeof(struct scsi_tape *));
4033 kfree(scsi_tapes);
4034 }
4035 scsi_tapes = tmp_da;
4036
4037 st_dev_max = tmp_dev_max;
4038 }
4039
4040 for (i = 0; i < st_dev_max; i++)
4041 if (scsi_tapes[i] == NULL)
4042 break;
4043 if (i >= st_dev_max)
4044 panic("scsi_devices corrupt (st)");
4045
4046 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4047 if (tpnt == NULL) {
4048 write_unlock(&st_dev_arr_lock);
4049 printk(KERN_ERR "st: Can't allocate device descriptor.\n");
4050 goto out_put_disk;
4051 }
4052 kref_init(&tpnt->kref);
4053 tpnt->disk = disk;
4054 sprintf(disk->disk_name, "st%d", i);
4055 disk->private_data = &tpnt->driver;
4056 disk->queue = SDp->request_queue;
4057 tpnt->driver = &st_template;
4058 scsi_tapes[i] = tpnt;
4059 dev_num = i;
4060
4061 tpnt->device = SDp;
4062 if (SDp->scsi_level <= 2)
4063 tpnt->tape_type = MT_ISSCSI1;
4064 else
4065 tpnt->tape_type = MT_ISSCSI2;
4066
4067 tpnt->buffer = buffer;
4068 tpnt->buffer->last_SRpnt = NULL;
4069
4070 tpnt->inited = 0;
4071 tpnt->dirty = 0;
4072 tpnt->in_use = 0;
4073 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4074 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4075 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4076 tpnt->density = 0;
4077 tpnt->do_auto_lock = ST_AUTO_LOCK;
4078 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4079 tpnt->can_partitions = 0;
4080 tpnt->two_fm = ST_TWO_FM;
4081 tpnt->fast_mteom = ST_FAST_MTEOM;
4082 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4083 tpnt->sili = ST_SILI;
4084 tpnt->immediate = ST_NOWAIT;
4085 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4086 tpnt->partition = 0;
4087 tpnt->new_partition = 0;
4088 tpnt->nbr_partitions = 0;
4089 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4090 tpnt->long_timeout = ST_LONG_TIMEOUT;
4091 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4092
4093 for (i = 0; i < ST_NBR_MODES; i++) {
4094 STm = &(tpnt->modes[i]);
4095 STm->defined = 0;
4096 STm->sysv = ST_SYSV;
4097 STm->defaults_for_writes = 0;
4098 STm->do_async_writes = ST_ASYNC_WRITES;
4099 STm->do_buffer_writes = ST_BUFFER_WRITES;
4100 STm->do_read_ahead = ST_READ_AHEAD;
4101 STm->default_compression = ST_DONT_TOUCH;
4102 STm->default_blksize = (-1); /* No forced size */
4103 STm->default_density = (-1); /* No forced density */
4104 }
4105
4106 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4107 STps = &(tpnt->ps[i]);
4108 STps->rw = ST_IDLE;
4109 STps->eof = ST_NOEOF;
4110 STps->at_sm = 0;
4111 STps->last_block_valid = 0;
4112 STps->drv_block = (-1);
4113 STps->drv_file = (-1);
4114 }
4115
4116 tpnt->current_mode = 0;
4117 tpnt->modes[0].defined = 1;
4118
4119 tpnt->density_changed = tpnt->compression_changed =
4120 tpnt->blksize_changed = 0;
4121 mutex_init(&tpnt->lock);
4122
4123 st_nr_dev++;
4124 write_unlock(&st_dev_arr_lock);
4125
4126 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4127 STm = &(tpnt->modes[mode]);
4128 for (j=0; j < 2; j++) {
4129 cdev = cdev_alloc();
4130 if (!cdev) {
4131 printk(KERN_ERR
4132 "st%d: out of memory. Device not attached.\n",
4133 dev_num);
4134 goto out_free_tape;
4135 }
4136 cdev->owner = THIS_MODULE;
4137 cdev->ops = &st_fops;
4138
4139 error = cdev_add(cdev,
4140 MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
4141 1);
4142 if (error) {
4143 printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
4144 dev_num, j ? "non" : "auto", mode);
4145 printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
4146 goto out_free_tape;
4147 }
4148 STm->cdevs[j] = cdev;
4149
4150 }
4151 error = do_create_class_files(tpnt, dev_num, mode);
4152 if (error)
4153 goto out_free_tape;
4154 }
4155
4156 sdev_printk(KERN_NOTICE, SDp,
4157 "Attached scsi tape %s\n", tape_name(tpnt));
4158 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4159 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4160 queue_dma_alignment(SDp->request_queue) + 1);
4161
4162 return 0;
4163
4164out_free_tape:
4165 for (mode=0; mode < ST_NBR_MODES; mode++) {
4166 STm = &(tpnt->modes[mode]);
4167 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4168 "tape");
4169 for (j=0; j < 2; j++) {
4170 if (STm->cdevs[j]) {
4171 if (cdev == STm->cdevs[j])
4172 cdev = NULL;
4173 device_destroy(st_sysfs_class,
4174 MKDEV(SCSI_TAPE_MAJOR,
4175 TAPE_MINOR(i, mode, j)));
4176 cdev_del(STm->cdevs[j]);
4177 }
4178 }
4179 }
4180 if (cdev)
4181 cdev_del(cdev);
4182 write_lock(&st_dev_arr_lock);
4183 scsi_tapes[dev_num] = NULL;
4184 st_nr_dev--;
4185 write_unlock(&st_dev_arr_lock);
4186out_put_disk:
4187 put_disk(disk);
4188 kfree(tpnt);
4189out_buffer_free:
4190 kfree(buffer);
4191out:
4192 return -ENODEV;
4193};
4194
4195
4196static int st_remove(struct device *dev)
4197{
4198 struct scsi_device *SDp = to_scsi_device(dev);
4199 struct scsi_tape *tpnt;
4200 int i, j, mode;
4201
4202 write_lock(&st_dev_arr_lock);
4203 for (i = 0; i < st_dev_max; i++) {
4204 tpnt = scsi_tapes[i];
4205 if (tpnt != NULL && tpnt->device == SDp) {
4206 scsi_tapes[i] = NULL;
4207 st_nr_dev--;
4208 write_unlock(&st_dev_arr_lock);
4209 sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
4210 "tape");
4211 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4212 for (j=0; j < 2; j++) {
4213 device_destroy(st_sysfs_class,
4214 MKDEV(SCSI_TAPE_MAJOR,
4215 TAPE_MINOR(i, mode, j)));
4216 cdev_del(tpnt->modes[mode].cdevs[j]);
4217 tpnt->modes[mode].cdevs[j] = NULL;
4218 }
4219 }
4220
4221 mutex_lock(&st_ref_mutex);
4222 kref_put(&tpnt->kref, scsi_tape_release);
4223 mutex_unlock(&st_ref_mutex);
4224 return 0;
4225 }
4226 }
4227
4228 write_unlock(&st_dev_arr_lock);
4229 return 0;
4230}
4231
4232/**
4233 * scsi_tape_release - Called to free the Scsi_Tape structure
4234 * @kref: pointer to embedded kref
4235 *
4236 * st_ref_mutex must be held entering this routine. Because it is
4237 * called on last put, you should always use the scsi_tape_get()
4238 * scsi_tape_put() helpers which manipulate the semaphore directly
4239 * and never do a direct kref_put().
4240 **/
4241static void scsi_tape_release(struct kref *kref)
4242{
4243 struct scsi_tape *tpnt = to_scsi_tape(kref);
4244 struct gendisk *disk = tpnt->disk;
4245
4246 tpnt->device = NULL;
4247
4248 if (tpnt->buffer) {
4249 normalize_buffer(tpnt->buffer);
4250 kfree(tpnt->buffer->reserved_pages);
4251 kfree(tpnt->buffer);
4252 }
4253
4254 disk->private_data = NULL;
4255 put_disk(disk);
4256 kfree(tpnt);
4257 return;
4258}
4259
4260static int __init init_st(void)
4261{
4262 int err;
4263
4264 validate_options();
4265
4266 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4267 verstr, st_fixed_buffer_size, st_max_sg_segs);
4268
4269 st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
4270 if (IS_ERR(st_sysfs_class)) {
4271 printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
4272 return PTR_ERR(st_sysfs_class);
4273 }
4274
4275 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4276 ST_MAX_TAPE_ENTRIES, "st");
4277 if (err) {
4278 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4279 SCSI_TAPE_MAJOR);
4280 goto err_class;
4281 }
4282
4283 err = scsi_register_driver(&st_template.gendrv);
4284 if (err)
4285 goto err_chrdev;
4286
4287 err = do_create_sysfs_files();
4288 if (err)
4289 goto err_scsidrv;
4290
4291 return 0;
4292
4293err_scsidrv:
4294 scsi_unregister_driver(&st_template.gendrv);
4295err_chrdev:
4296 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4297 ST_MAX_TAPE_ENTRIES);
4298err_class:
4299 class_destroy(st_sysfs_class);
4300 return err;
4301}
4302
4303static void __exit exit_st(void)
4304{
4305 do_remove_sysfs_files();
4306 scsi_unregister_driver(&st_template.gendrv);
4307 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4308 ST_MAX_TAPE_ENTRIES);
4309 class_destroy(st_sysfs_class);
4310 kfree(scsi_tapes);
4311 printk(KERN_INFO "st: Unloaded.\n");
4312}
4313
4314module_init(init_st);
4315module_exit(exit_st);
4316
4317
4318/* The sysfs driver interface. Read-only at the moment */
4319static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf)
4320{
4321 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4322}
4323static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL);
4324
4325static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4326{
4327 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4328}
4329static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL);
4330
4331static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf)
4332{
4333 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4334}
4335static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL);
4336
4337static ssize_t st_version_show(struct device_driver *ddd, char *buf)
4338{
4339 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4340}
4341static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
4342
4343static int do_create_sysfs_files(void)
4344{
4345 struct device_driver *sysfs = &st_template.gendrv;
4346 int err;
4347
4348 err = driver_create_file(sysfs, &driver_attr_try_direct_io);
4349 if (err)
4350 return err;
4351 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size);
4352 if (err)
4353 goto err_try_direct_io;
4354 err = driver_create_file(sysfs, &driver_attr_max_sg_segs);
4355 if (err)
4356 goto err_attr_fixed_buf;
4357 err = driver_create_file(sysfs, &driver_attr_version);
4358 if (err)
4359 goto err_attr_max_sg;
4360
4361 return 0;
4362
4363err_attr_max_sg:
4364 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4365err_attr_fixed_buf:
4366 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4367err_try_direct_io:
4368 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4369 return err;
4370}
4371
4372static void do_remove_sysfs_files(void)
4373{
4374 struct device_driver *sysfs = &st_template.gendrv;
4375
4376 driver_remove_file(sysfs, &driver_attr_version);
4377 driver_remove_file(sysfs, &driver_attr_max_sg_segs);
4378 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size);
4379 driver_remove_file(sysfs, &driver_attr_try_direct_io);
4380}
4381
4382
4383/* The sysfs simple class interface */
4384static ssize_t
4385st_defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4386{
4387 struct st_modedef *STm = dev_get_drvdata(dev);
4388 ssize_t l = 0;
4389
4390 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4391 return l;
4392}
4393
4394DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
4395
4396static ssize_t
4397st_defblk_show(struct device *dev, struct device_attribute *attr, char *buf)
4398{
4399 struct st_modedef *STm = dev_get_drvdata(dev);
4400 ssize_t l = 0;
4401
4402 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4403 return l;
4404}
4405
4406DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
4407
4408static ssize_t
4409st_defdensity_show(struct device *dev, struct device_attribute *attr, char *buf)
4410{
4411 struct st_modedef *STm = dev_get_drvdata(dev);
4412 ssize_t l = 0;
4413 char *fmt;
4414
4415 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4416 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4417 return l;
4418}
4419
4420DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
4421
4422static ssize_t
4423st_defcompression_show(struct device *dev, struct device_attribute *attr,
4424 char *buf)
4425{
4426 struct st_modedef *STm = dev_get_drvdata(dev);
4427 ssize_t l = 0;
4428
4429 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4430 return l;
4431}
4432
4433DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
4434
4435static ssize_t
4436st_options_show(struct device *dev, struct device_attribute *attr, char *buf)
4437{
4438 struct st_modedef *STm = dev_get_drvdata(dev);
4439 struct scsi_tape *STp;
4440 int i, j, options;
4441 ssize_t l = 0;
4442
4443 for (i=0; i < st_dev_max; i++) {
4444 for (j=0; j < ST_NBR_MODES; j++)
4445 if (&scsi_tapes[i]->modes[j] == STm)
4446 break;
4447 if (j < ST_NBR_MODES)
4448 break;
4449 }
4450 if (i == st_dev_max)
4451 return 0; /* should never happen */
4452
4453 STp = scsi_tapes[i];
4454
4455 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4456 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4457 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4458 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4459 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4460 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4461 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4462 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4463 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4464 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4465 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4466 options |= STm->sysv ? MT_ST_SYSV : 0;
4467 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4468 options |= STp->sili ? MT_ST_SILI : 0;
4469
4470 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4471 return l;
4472}
4473
4474DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
4475
4476static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
4477{
4478 int i, rew, error;
4479 char name[10];
4480 struct device *st_class_member;
4481
4482 for (rew=0; rew < 2; rew++) {
4483 /* Make sure that the minor numbers corresponding to the four
4484 first modes always get the same names */
4485 i = mode << (4 - ST_NBR_MODE_BITS);
4486 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4487 STp->disk->disk_name, st_formats[i]);
4488 st_class_member =
4489 device_create(st_sysfs_class, &STp->device->sdev_gendev,
4490 MKDEV(SCSI_TAPE_MAJOR,
4491 TAPE_MINOR(dev_num, mode, rew)),
4492 &STp->modes[mode], "%s", name);
4493 if (IS_ERR(st_class_member)) {
4494 printk(KERN_WARNING "st%d: device_create failed\n",
4495 dev_num);
4496 error = PTR_ERR(st_class_member);
4497 goto out;
4498 }
4499
4500 error = device_create_file(st_class_member,
4501 &dev_attr_defined);
4502 if (error) goto out;
4503 error = device_create_file(st_class_member,
4504 &dev_attr_default_blksize);
4505 if (error) goto out;
4506 error = device_create_file(st_class_member,
4507 &dev_attr_default_density);
4508 if (error) goto out;
4509 error = device_create_file(st_class_member,
4510 &dev_attr_default_compression);
4511 if (error) goto out;
4512 error = device_create_file(st_class_member,
4513 &dev_attr_options);
4514 if (error) goto out;
4515
4516 if (mode == 0 && rew == 0) {
4517 error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
4518 &st_class_member->kobj,
4519 "tape");
4520 if (error) {
4521 printk(KERN_ERR
4522 "st%d: Can't create sysfs link from SCSI device.\n",
4523 dev_num);
4524 goto out;
4525 }
4526 }
4527 }
4528
4529 return 0;
4530
4531out:
4532 return error;
4533}
4534
4535/* The following functions may be useful for a larger audience. */
4536static int sgl_map_user_pages(struct st_buffer *STbp,
4537 const unsigned int max_pages, unsigned long uaddr,
4538 size_t count, int rw)
4539{
4540 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4541 unsigned long start = uaddr >> PAGE_SHIFT;
4542 const int nr_pages = end - start;
4543 int res, i, j;
4544 struct page **pages;
4545 struct rq_map_data *mdata = &STbp->map_data;
4546
4547 /* User attempted Overflow! */
4548 if ((uaddr + count) < uaddr)
4549 return -EINVAL;
4550
4551 /* Too big */
4552 if (nr_pages > max_pages)
4553 return -ENOMEM;
4554
4555 /* Hmm? */
4556 if (count == 0)
4557 return 0;
4558
4559 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4560 return -ENOMEM;
4561
4562 /* Try to fault in all of the necessary pages */
4563 down_read(¤t->mm->mmap_sem);
4564 /* rw==READ means read from drive, write into memory area */
4565 res = get_user_pages(
4566 current,
4567 current->mm,
4568 uaddr,
4569 nr_pages,
4570 rw == READ,
4571 0, /* don't force */
4572 pages,
4573 NULL);
4574 up_read(¤t->mm->mmap_sem);
4575
4576 /* Errors and no page mapped should return here */
4577 if (res < nr_pages)
4578 goto out_unmap;
4579
4580 for (i=0; i < nr_pages; i++) {
4581 /* FIXME: flush superflous for rw==READ,
4582 * probably wrong function for rw==WRITE
4583 */
4584 flush_dcache_page(pages[i]);
4585 }
4586
4587 mdata->offset = uaddr & ~PAGE_MASK;
4588 STbp->mapped_pages = pages;
4589
4590 return nr_pages;
4591 out_unmap:
4592 if (res > 0) {
4593 for (j=0; j < res; j++)
4594 page_cache_release(pages[j]);
4595 res = 0;
4596 }
4597 kfree(pages);
4598 return res;
4599}
4600
4601
4602/* And unmap them... */
4603static int sgl_unmap_user_pages(struct st_buffer *STbp,
4604 const unsigned int nr_pages, int dirtied)
4605{
4606 int i;
4607
4608 for (i=0; i < nr_pages; i++) {
4609 struct page *page = STbp->mapped_pages[i];
4610
4611 if (dirtied)
4612 SetPageDirty(page);
4613 /* FIXME: cache flush missing for rw==READ
4614 * FIXME: call the correct reference counting function
4615 */
4616 page_cache_release(page);
4617 }
4618 kfree(STbp->mapped_pages);
4619 STbp->mapped_pages = NULL;
4620
4621 return 0;
4622}
1/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
12 Copyright 1992 - 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 <asm/uaccess.h>
45#include <asm/dma.h>
46
47#include <scsi/scsi.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/scsi_device.h>
50#include <scsi/scsi_driver.h>
51#include <scsi/scsi_eh.h>
52#include <scsi/scsi_host.h>
53#include <scsi/scsi_ioctl.h>
54#include <scsi/sg.h>
55
56
57/* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
59#define DEBUG 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->cmd_flags |= REQ_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 (STp->block_size == 0 &&
1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1979 transfer = bytes;
1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
1995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
1997 st_release_request(SRpnt);
1998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
2000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
2003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
2011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
2016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
2031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
2034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
2045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
2048 }
2049 }
2050 /* end of EOF, EOM, ILI test */
2051 else { /* nonzero sense key */
2052 DEBC_printk(STp, "Tape error while reading.\n");
2053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
2067 /* End of extended sense test */
2068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
2073 /* End of error handling */
2074 else { /* Read successful */
2075 STbp->buffer_bytes = bytes;
2076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
2079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087}
2088
2089
2090/* Read command */
2091static ssize_t
2092st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093{
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
2098 struct st_request *SRpnt = NULL;
2099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
2103
2104 if (mutex_lock_interruptible(&STp->lock))
2105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
2127 DEB(
2128 if (debugging && STps->eof != ST_NOEOF)
2129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
2133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
2179 DEB(
2180 if (debugging && STps->eof != ST_NOEOF)
2181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
2186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
2225 st_release_request(SRpnt);
2226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
2229 release_buffering(STp, 1);
2230 STbp->buffer_bytes = 0;
2231 }
2232 mutex_unlock(&STp->lock);
2233
2234 return retval;
2235}
2236
2237
2238
2239DEB(
2240/* Set the driver options */
2241static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2242{
2243 if (debugging) {
2244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2265 }
2266}
2267 )
2268
2269
2270static int st_set_options(struct scsi_tape *STp, long options)
2271{
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
2275 struct cdev *cd0, *cd1;
2276 struct device *d0, *d1;
2277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
2280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
2289 modes_defined = 1;
2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
2292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2310 STm->sysv = (options & MT_ST_SYSV) != 0;
2311 STp->sili = (options & MT_ST_SILI) != 0;
2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2313 st_log_options(STp, STm); )
2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
2341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
2343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
2345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
2347 DEB(
2348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
2350 st_log_options(STp, STm); )
2351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
2357 DEBC_printk(STp, "Default block size disabled.\n");
2358 } else {
2359 STm->default_blksize = value;
2360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
2362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
2373 } else {
2374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
2378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
2382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
2384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
2388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
2391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
2397 DEBC_printk(STp,
2398 "Density default disabled.\n");
2399 } else {
2400 STm->default_density = value & 0xff;
2401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
2403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
2411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
2413 } else {
2414 STp->default_drvbuffer = value & 7;
2415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
2418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
2424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
2426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
2429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
2432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
2438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449}
2450
2451#define MODE_HEADER_LENGTH 4
2452
2453/* Mode header and page byte offsets */
2454#define MH_OFF_DATA_LENGTH 0
2455#define MH_OFF_MEDIUM_TYPE 1
2456#define MH_OFF_DEV_SPECIFIC 2
2457#define MH_OFF_BDESCS_LENGTH 3
2458#define MP_OFF_PAGE_NBR 0
2459#define MP_OFF_PAGE_LENGTH 1
2460
2461/* Mode header and page bit masks */
2462#define MH_BIT_WP 0x80
2463#define MP_MSK_PAGE_NBR 0x3f
2464
2465/* Don't return block descriptors */
2466#define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468#define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470/* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474{
2475 unsigned char cmd[MAX_COMMAND_SIZE];
2476 struct st_request *SRpnt;
2477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
2489
2490 st_release_request(SRpnt);
2491
2492 return STp->buffer->syscall_result;
2493}
2494
2495
2496/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499{
2500 int pgo;
2501 unsigned char cmd[MAX_COMMAND_SIZE];
2502 struct st_request *SRpnt;
2503 int timeout;
2504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
2517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
2523
2524 st_release_request(SRpnt);
2525
2526 return STp->buffer->syscall_result;
2527}
2528
2529
2530#define COMPRESSION_PAGE 0x0f
2531#define COMPRESSION_PAGE_LENGTH 16
2532
2533#define CP_OFF_DCE_DCC 2
2534#define CP_OFF_C_ALGO 7
2535
2536#define DCE_MASK 0x80
2537#define DCC_MASK 0x40
2538#define RED_MASK 0x60
2539
2540
2541/* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547static int st_compression(struct scsi_tape * STp, int state)
2548{
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
2552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
2559 DEBC_printk(STp, "Compression mode page not supported.\n");
2560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2569 DEBC_printk(STp, "Compression not supported.\n");
2570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
2587 DEBC_printk(STp, "Compression change failed.\n");
2588 return (-EIO);
2589 }
2590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2591
2592 STp->compression_changed = 1;
2593 return 0;
2594}
2595
2596
2597/* Process the load and unload commands (does unload if the load code is zero) */
2598static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599{
2600 int retval = (-EIO), timeout;
2601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
2603 struct st_request *SRpnt;
2604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
2628 timeout = STp->device->request_queue->rq_timeout;
2629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2636 else
2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2638 );
2639
2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
2642 if (!SRpnt)
2643 return (STp->buffer)->syscall_result;
2644
2645 retval = (STp->buffer)->syscall_result;
2646 st_release_request(SRpnt);
2647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667}
2668
2669#if DEBUG
2670#define ST_DEB_FORWARD 0
2671#define ST_DEB_BACKWARD 1
2672static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2673{
2674 s32 sc;
2675
2676 if (!debugging)
2677 return;
2678
2679 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2681 if (direction)
2682 sc = -sc;
2683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2684 direction ? "backward" : "forward", sc, units);
2685}
2686#else
2687#define ST_DEB_FORWARD 0
2688#define ST_DEB_BACKWARD 1
2689static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
2690#endif
2691
2692
2693/* Internal ioctl function */
2694static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2695{
2696 int timeout;
2697 long ltmp;
2698 int ioctl_result;
2699 int chg_eof = 1;
2700 unsigned char cmd[MAX_COMMAND_SIZE];
2701 struct st_request *SRpnt;
2702 struct st_partstat *STps;
2703 int fileno, blkno, at_sm, undone;
2704 int datalen = 0, direction = DMA_NONE;
2705
2706 WARN_ON(STp->buffer->do_dio != 0);
2707 if (STp->ready != ST_READY) {
2708 if (STp->ready == ST_NO_TAPE)
2709 return (-ENOMEDIUM);
2710 else
2711 return (-EIO);
2712 }
2713 timeout = STp->long_timeout;
2714 STps = &(STp->ps[STp->partition]);
2715 fileno = STps->drv_file;
2716 blkno = STps->drv_block;
2717 at_sm = STps->at_sm;
2718
2719 memset(cmd, 0, MAX_COMMAND_SIZE);
2720 switch (cmd_in) {
2721 case MTFSFM:
2722 chg_eof = 0; /* Changed from the FSF after this */
2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
2737 case MTBSF:
2738 cmd[0] = SPACE;
2739 cmd[1] = 0x01; /* Space FileMarks */
2740 ltmp = (-arg);
2741 cmd[2] = (ltmp >> 16);
2742 cmd[3] = (ltmp >> 8);
2743 cmd[4] = ltmp;
2744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2745 if (fileno >= 0)
2746 fileno -= arg;
2747 blkno = (-1); /* We can't know the block number */
2748 at_sm &= (arg == 0);
2749 break;
2750 case MTFSR:
2751 cmd[0] = SPACE;
2752 cmd[1] = 0x00; /* Space Blocks */
2753 cmd[2] = (arg >> 16);
2754 cmd[3] = (arg >> 8);
2755 cmd[4] = arg;
2756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2757 if (blkno >= 0)
2758 blkno += arg;
2759 at_sm &= (arg == 0);
2760 break;
2761 case MTBSR:
2762 cmd[0] = SPACE;
2763 cmd[1] = 0x00; /* Space Blocks */
2764 ltmp = (-arg);
2765 cmd[2] = (ltmp >> 16);
2766 cmd[3] = (ltmp >> 8);
2767 cmd[4] = ltmp;
2768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2769 if (blkno >= 0)
2770 blkno -= arg;
2771 at_sm &= (arg == 0);
2772 break;
2773 case MTFSS:
2774 cmd[0] = SPACE;
2775 cmd[1] = 0x04; /* Space Setmarks */
2776 cmd[2] = (arg >> 16);
2777 cmd[3] = (arg >> 8);
2778 cmd[4] = arg;
2779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2780 if (arg != 0) {
2781 blkno = fileno = (-1);
2782 at_sm = 1;
2783 }
2784 break;
2785 case MTBSS:
2786 cmd[0] = SPACE;
2787 cmd[1] = 0x04; /* Space Setmarks */
2788 ltmp = (-arg);
2789 cmd[2] = (ltmp >> 16);
2790 cmd[3] = (ltmp >> 8);
2791 cmd[4] = ltmp;
2792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2793 if (arg != 0) {
2794 blkno = fileno = (-1);
2795 at_sm = 1;
2796 }
2797 break;
2798 case MTWEOF:
2799 case MTWEOFI:
2800 case MTWSM:
2801 if (STp->write_prot)
2802 return (-EACCES);
2803 cmd[0] = WRITE_FILEMARKS;
2804 if (cmd_in == MTWSM)
2805 cmd[1] = 2;
2806 if (cmd_in == MTWEOFI ||
2807 (cmd_in == MTWEOF && STp->immediate_filemark))
2808 cmd[1] |= 1;
2809 cmd[2] = (arg >> 16);
2810 cmd[3] = (arg >> 8);
2811 cmd[4] = arg;
2812 timeout = STp->device->request_queue->rq_timeout;
2813 DEBC(
2814 if (cmd_in != MTWSM)
2815 st_printk(ST_DEB_MSG, STp,
2816 "Writing %d filemarks.\n",
2817 cmd[2] * 65536 +
2818 cmd[3] * 256 +
2819 cmd[4]);
2820 else
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d setmarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
2826 )
2827 if (fileno >= 0)
2828 fileno += arg;
2829 blkno = 0;
2830 at_sm = (cmd_in == MTWSM);
2831 break;
2832 case MTREW:
2833 cmd[0] = REZERO_UNIT;
2834 if (STp->immediate) {
2835 cmd[1] = 1; /* Don't wait for completion */
2836 timeout = STp->device->request_queue->rq_timeout;
2837 }
2838 DEBC_printk(STp, "Rewinding tape.\n");
2839 fileno = blkno = at_sm = 0;
2840 break;
2841 case MTNOP:
2842 DEBC_printk(STp, "No op on tape.\n");
2843 return 0; /* Should do something ? */
2844 break;
2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
2849 timeout = STp->device->request_queue->rq_timeout;
2850 }
2851 cmd[4] = 3;
2852 DEBC_printk(STp, "Retensioning tape.\n");
2853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
2881 timeout = STp->device->request_queue->rq_timeout;
2882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
2886 DEBC_printk(STp, "Erasing tape.\n");
2887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
2933 timeout = STp->device->request_queue->rq_timeout;
2934 DEBC(
2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
2945 if (cmd_in == MTSETDRVBUFFER)
2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
2949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
2957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
2960 ioctl_result = (STp->buffer)->syscall_result;
2961
2962 if (!ioctl_result) { /* SCSI command successful */
2963 st_release_request(SRpnt);
2964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
2977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
2997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3014 cmdstatp->have_sense &&
3015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
3026 STps->drv_file = fileno;
3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3078 st_release_request(SRpnt);
3079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
3088 st_release_request(SRpnt);
3089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093}
3094
3095
3096/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101{
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
3104 struct st_request *SRpnt;
3105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
3121 if (!SRpnt)
3122 return (STp->buffer)->syscall_result;
3123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
3128 DEBC_printk(STp, " Can't read tape position.\n");
3129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
3149 }
3150 st_release_request(SRpnt);
3151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161{
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
3167 struct st_request *SRpnt;
3168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
3176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
3189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
3192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
3213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
3216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
3220 timeout = STp->device->request_queue->rq_timeout;
3221 }
3222
3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
3225 if (!SRpnt)
3226 return (STp->buffer)->syscall_result;
3227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
3251
3252 st_release_request(SRpnt);
3253 SRpnt = NULL;
3254
3255 return result;
3256}
3257
3258
3259/* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261static int find_partition(struct scsi_tape *STp)
3262{
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271}
3272
3273
3274/* Change the partition if necessary */
3275static int switch_partition(struct scsi_tape *STp)
3276{
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285}
3286
3287/* Functions for reading and writing the medium partition mode page. */
3288
3289#define PART_PAGE 0x11
3290#define PART_PAGE_FIXED_LENGTH 8
3291
3292#define PP_OFF_MAX_ADD_PARTS 2
3293#define PP_OFF_NBR_ADD_PARTS 3
3294#define PP_OFF_FLAGS 4
3295#define PP_OFF_PART_UNITS 6
3296#define PP_OFF_RESERVED 7
3297
3298#define PP_BIT_IDP 0x20
3299#define PP_BIT_FDP 0x80
3300#define PP_MSK_PSUM_MB 0x10
3301#define PP_MSK_PSUM_UNITS 0x18
3302#define PP_MSK_POFM 0x04
3303
3304/* Get the number of partitions on the tape. As a side effect reads the
3305 mode page into the tape buffer. */
3306static int nbr_partitions(struct scsi_tape *STp)
3307{
3308 int result;
3309
3310 if (STp->ready != ST_READY)
3311 return (-EIO);
3312
3313 result = read_mode_page(STp, PART_PAGE, 1);
3314
3315 if (result) {
3316 DEBC_printk(STp, "Can't read medium partition page.\n");
3317 result = (-EIO);
3318 } else {
3319 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3320 PP_OFF_NBR_ADD_PARTS] + 1;
3321 DEBC_printk(STp, "Number of partitions %d.\n", result);
3322 }
3323
3324 return result;
3325}
3326
3327
3328static int format_medium(struct scsi_tape *STp, int format)
3329{
3330 int result = 0;
3331 int timeout = STp->long_timeout;
3332 unsigned char scmd[MAX_COMMAND_SIZE];
3333 struct st_request *SRpnt;
3334
3335 memset(scmd, 0, MAX_COMMAND_SIZE);
3336 scmd[0] = FORMAT_UNIT;
3337 scmd[2] = format;
3338 if (STp->immediate) {
3339 scmd[1] |= 1; /* Don't wait for completion */
3340 timeout = STp->device->request_queue->rq_timeout;
3341 }
3342 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3343 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3344 timeout, MAX_RETRIES, 1);
3345 if (!SRpnt)
3346 result = STp->buffer->syscall_result;
3347 return result;
3348}
3349
3350
3351/* Partition the tape into two partitions if size > 0 or one partition if
3352 size == 0.
3353
3354 The block descriptors are read and written because Sony SDT-7000 does not
3355 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3356
3357 My HP C1533A drive returns only one partition size field. This is used to
3358 set the size of partition 1. There is no size field for the default partition.
3359 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3360 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3361 The following algorithm is used to accommodate both drives: if the number of
3362 partition size fields is greater than the maximum number of additional partitions
3363 in the mode page, the second field is used. Otherwise the first field is used.
3364
3365 For Seagate DDS drives the page length must be 8 when no partitions is defined
3366 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3367 is acceptable also to some other old drives and enforced if the first partition
3368 size field is used for the first additional partition size.
3369
3370 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3371 */
3372static int partition_tape(struct scsi_tape *STp, int size)
3373{
3374 int result;
3375 int target_partition;
3376 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3377 int pgo, psd_cnt, psdo;
3378 int psum = PP_MSK_PSUM_MB, units = 0;
3379 unsigned char *bp;
3380
3381 result = read_mode_page(STp, PART_PAGE, 0);
3382 if (result) {
3383 DEBC_printk(STp, "Can't read partition mode page.\n");
3384 return result;
3385 }
3386 target_partition = 1;
3387 if (size < 0) {
3388 target_partition = 0;
3389 size = -size;
3390 }
3391
3392 /* The mode page is in the buffer. Let's modify it and write it. */
3393 bp = (STp->buffer)->b_data;
3394 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3395 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3396 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3397
3398 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3399
3400 if (scsi3) {
3401 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3402 if (needs_format && size == 0) {
3403 /* No need to write the mode page when clearing
3404 * partitioning
3405 */
3406 DEBC_printk(STp, "Formatting tape with one partition.\n");
3407 result = format_medium(STp, 0);
3408 goto out;
3409 }
3410 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3411 psd_cnt = 2;
3412 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3413 /* Use units scaling for large partitions if the device
3414 * suggests it and no precision lost. Required for IBM
3415 * TS1140/50 drives that don't support MB units.
3416 */
3417 if (size >= 1000 && (size % 1000) == 0) {
3418 size /= 1000;
3419 psum = PP_MSK_PSUM_UNITS;
3420 units = 9; /* GB */
3421 }
3422 }
3423 /* Try it anyway if too large to specify in MB */
3424 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3425 size /= 1000;
3426 psum = PP_MSK_PSUM_UNITS;
3427 units = 9; /* GB */
3428 }
3429 }
3430
3431 if (size >= 65535 || /* Does not fit into two bytes */
3432 (target_partition == 0 && psd_cnt < 2)) {
3433 result = -EINVAL;
3434 goto out;
3435 }
3436
3437 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3438 /* The second condition is for HP DDS which use only one partition size
3439 * descriptor
3440 */
3441 if (target_partition > 0 &&
3442 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3443 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3444 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3445 psdo += 2;
3446 }
3447 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3448
3449 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3450 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3451 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3452
3453 if (size == 0) {
3454 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3455 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3456 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3457 DEBC_printk(STp, "Formatting tape with one partition.\n");
3458 } else {
3459 bp[psdo] = (size >> 8) & 0xff;
3460 bp[psdo + 1] = size & 0xff;
3461 if (target_partition == 0)
3462 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3463 bp[pgo + 3] = 1;
3464 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3465 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3466 DEBC_printk(STp,
3467 "Formatting tape with two partitions (%i = %d MB).\n",
3468 target_partition, units > 0 ? size * 1000 : size);
3469 }
3470 bp[pgo + PP_OFF_PART_UNITS] = 0;
3471 bp[pgo + PP_OFF_RESERVED] = 0;
3472 if (size != 1 || units != 0) {
3473 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3474 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3475 bp[pgo + PP_OFF_PART_UNITS] = units;
3476 } else
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3479 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3480
3481 result = write_mode_page(STp, PART_PAGE, 1);
3482
3483 if (!result && needs_format)
3484 result = format_medium(STp, 1);
3485
3486 if (result) {
3487 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3488 result = (-EIO);
3489 }
3490
3491out:
3492 return result;
3493}
3494
3495
3496
3497/* The ioctl command */
3498static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3499{
3500 int i, cmd_nr, cmd_type, bt;
3501 int retval = 0;
3502 unsigned int blk;
3503 struct scsi_tape *STp = file->private_data;
3504 struct st_modedef *STm;
3505 struct st_partstat *STps;
3506 void __user *p = (void __user *)arg;
3507
3508 if (mutex_lock_interruptible(&STp->lock))
3509 return -ERESTARTSYS;
3510
3511 DEB(
3512 if (debugging && !STp->in_use) {
3513 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3514 retval = (-EIO);
3515 goto out;
3516 } ) /* end DEB */
3517
3518 STm = &(STp->modes[STp->current_mode]);
3519 STps = &(STp->ps[STp->partition]);
3520
3521 /*
3522 * If we are in the middle of error recovery, don't let anyone
3523 * else try and use this device. Also, if error recovery fails, it
3524 * may try and take the device offline, in which case all further
3525 * access to the device is prohibited.
3526 */
3527 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3528 file->f_flags & O_NDELAY);
3529 if (retval)
3530 goto out;
3531
3532 cmd_type = _IOC_TYPE(cmd_in);
3533 cmd_nr = _IOC_NR(cmd_in);
3534
3535 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3536 struct mtop mtc;
3537
3538 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3539 retval = (-EINVAL);
3540 goto out;
3541 }
3542
3543 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3544 if (i) {
3545 retval = (-EFAULT);
3546 goto out;
3547 }
3548
3549 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3550 st_printk(KERN_WARNING, STp,
3551 "MTSETDRVBUFFER only allowed for root.\n");
3552 retval = (-EPERM);
3553 goto out;
3554 }
3555 if (!STm->defined &&
3556 (mtc.mt_op != MTSETDRVBUFFER &&
3557 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3558 retval = (-ENXIO);
3559 goto out;
3560 }
3561
3562 if (!STp->pos_unknown) {
3563
3564 if (STps->eof == ST_FM_HIT) {
3565 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3566 mtc.mt_op == MTEOM) {
3567 mtc.mt_count -= 1;
3568 if (STps->drv_file >= 0)
3569 STps->drv_file += 1;
3570 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3571 mtc.mt_count += 1;
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 }
3575 }
3576
3577 if (mtc.mt_op == MTSEEK) {
3578 /* Old position must be restored if partition will be
3579 changed */
3580 i = !STp->can_partitions ||
3581 (STp->new_partition != STp->partition);
3582 } else {
3583 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3584 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3585 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3586 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3587 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3588 mtc.mt_op == MTCOMPRESSION;
3589 }
3590 i = flush_buffer(STp, i);
3591 if (i < 0) {
3592 retval = i;
3593 goto out;
3594 }
3595 if (STps->rw == ST_WRITING &&
3596 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3597 mtc.mt_op == MTSEEK ||
3598 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3599 i = st_int_ioctl(STp, MTWEOF, 1);
3600 if (i < 0) {
3601 retval = i;
3602 goto out;
3603 }
3604 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3605 mtc.mt_count++;
3606 STps->rw = ST_IDLE;
3607 }
3608
3609 } else {
3610 /*
3611 * If there was a bus reset, block further access
3612 * to this device. If the user wants to rewind the tape,
3613 * then reset the flag and allow access again.
3614 */
3615 if (mtc.mt_op != MTREW &&
3616 mtc.mt_op != MTOFFL &&
3617 mtc.mt_op != MTRETEN &&
3618 mtc.mt_op != MTERASE &&
3619 mtc.mt_op != MTSEEK &&
3620 mtc.mt_op != MTEOM) {
3621 retval = (-EIO);
3622 goto out;
3623 }
3624 reset_state(STp);
3625 /* remove this when the midlevel properly clears was_reset */
3626 STp->device->was_reset = 0;
3627 }
3628
3629 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3630 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3631 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3632 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3633
3634 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3635 do_door_lock(STp, 0); /* Ignore result! */
3636
3637 if (mtc.mt_op == MTSETDRVBUFFER &&
3638 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3639 retval = st_set_options(STp, mtc.mt_count);
3640 goto out;
3641 }
3642
3643 if (mtc.mt_op == MTSETPART) {
3644 if (!STp->can_partitions ||
3645 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3646 retval = (-EINVAL);
3647 goto out;
3648 }
3649 if (mtc.mt_count >= STp->nbr_partitions &&
3650 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3651 retval = (-EIO);
3652 goto out;
3653 }
3654 if (mtc.mt_count >= STp->nbr_partitions) {
3655 retval = (-EINVAL);
3656 goto out;
3657 }
3658 STp->new_partition = mtc.mt_count;
3659 retval = 0;
3660 goto out;
3661 }
3662
3663 if (mtc.mt_op == MTMKPART) {
3664 if (!STp->can_partitions) {
3665 retval = (-EINVAL);
3666 goto out;
3667 }
3668 i = do_load_unload(STp, file, 1);
3669 if (i < 0) {
3670 retval = i;
3671 goto out;
3672 }
3673 i = partition_tape(STp, mtc.mt_count);
3674 if (i < 0) {
3675 retval = i;
3676 goto out;
3677 }
3678 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3679 STp->ps[i].rw = ST_IDLE;
3680 STp->ps[i].at_sm = 0;
3681 STp->ps[i].last_block_valid = 0;
3682 }
3683 STp->partition = STp->new_partition = 0;
3684 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3685 STps->drv_block = STps->drv_file = 0;
3686 retval = 0;
3687 goto out;
3688 }
3689
3690 if (mtc.mt_op == MTSEEK) {
3691 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3692 if (!STp->can_partitions)
3693 STp->ps[0].rw = ST_IDLE;
3694 retval = i;
3695 goto out;
3696 }
3697
3698 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3699 retval = do_load_unload(STp, file, 0);
3700 goto out;
3701 }
3702
3703 if (mtc.mt_op == MTLOAD) {
3704 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3705 goto out;
3706 }
3707
3708 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3709 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3710 goto out;
3711 }
3712
3713 if (STp->can_partitions && STp->ready == ST_READY &&
3714 (i = switch_partition(STp)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718
3719 if (mtc.mt_op == MTCOMPRESSION)
3720 retval = st_compression(STp, (mtc.mt_count & 1));
3721 else
3722 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3723 goto out;
3724 }
3725 if (!STm->defined) {
3726 retval = (-ENXIO);
3727 goto out;
3728 }
3729
3730 if ((i = flush_buffer(STp, 0)) < 0) {
3731 retval = i;
3732 goto out;
3733 }
3734 if (STp->can_partitions &&
3735 (i = switch_partition(STp)) < 0) {
3736 retval = i;
3737 goto out;
3738 }
3739
3740 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3741 struct mtget mt_status;
3742
3743 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3744 retval = (-EINVAL);
3745 goto out;
3746 }
3747
3748 mt_status.mt_type = STp->tape_type;
3749 mt_status.mt_dsreg =
3750 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3751 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3752 mt_status.mt_blkno = STps->drv_block;
3753 mt_status.mt_fileno = STps->drv_file;
3754 if (STp->block_size != 0) {
3755 if (STps->rw == ST_WRITING)
3756 mt_status.mt_blkno +=
3757 (STp->buffer)->buffer_bytes / STp->block_size;
3758 else if (STps->rw == ST_READING)
3759 mt_status.mt_blkno -=
3760 ((STp->buffer)->buffer_bytes +
3761 STp->block_size - 1) / STp->block_size;
3762 }
3763
3764 mt_status.mt_gstat = 0;
3765 if (STp->drv_write_prot)
3766 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3767 if (mt_status.mt_blkno == 0) {
3768 if (mt_status.mt_fileno == 0)
3769 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3770 else
3771 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3772 }
3773 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3774 mt_status.mt_resid = STp->partition;
3775 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3776 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3777 else if (STps->eof >= ST_EOM_OK)
3778 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3779 if (STp->density == 1)
3780 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3781 else if (STp->density == 2)
3782 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3783 else if (STp->density == 3)
3784 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3785 if (STp->ready == ST_READY)
3786 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3787 if (STp->ready == ST_NO_TAPE)
3788 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3789 if (STps->at_sm)
3790 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3791 if (STm->do_async_writes ||
3792 (STm->do_buffer_writes && STp->block_size != 0) ||
3793 STp->drv_buffer != 0)
3794 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3795 if (STp->cleaning_req)
3796 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3797
3798 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3799 if (i) {
3800 retval = (-EFAULT);
3801 goto out;
3802 }
3803
3804 STp->recover_reg = 0; /* Clear after read */
3805 retval = 0;
3806 goto out;
3807 } /* End of MTIOCGET */
3808 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3809 struct mtpos mt_pos;
3810 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3811 retval = (-EINVAL);
3812 goto out;
3813 }
3814 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3815 retval = i;
3816 goto out;
3817 }
3818 mt_pos.mt_blkno = blk;
3819 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3820 if (i)
3821 retval = (-EFAULT);
3822 goto out;
3823 }
3824 mutex_unlock(&STp->lock);
3825 switch (cmd_in) {
3826 case SCSI_IOCTL_GET_IDLUN:
3827 case SCSI_IOCTL_GET_BUS_NUMBER:
3828 break;
3829 default:
3830 if ((cmd_in == SG_IO ||
3831 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3832 cmd_in == CDROM_SEND_PACKET) &&
3833 !capable(CAP_SYS_RAWIO))
3834 i = -EPERM;
3835 else
3836 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3837 file->f_mode, cmd_in, p);
3838 if (i != -ENOTTY)
3839 return i;
3840 break;
3841 }
3842 retval = scsi_ioctl(STp->device, cmd_in, p);
3843 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3844 STp->rew_at_close = 0;
3845 STp->ready = ST_NO_TAPE;
3846 }
3847 return retval;
3848
3849 out:
3850 mutex_unlock(&STp->lock);
3851 return retval;
3852}
3853
3854#ifdef CONFIG_COMPAT
3855static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3856{
3857 struct scsi_tape *STp = file->private_data;
3858 struct scsi_device *sdev = STp->device;
3859 int ret = -ENOIOCTLCMD;
3860 if (sdev->host->hostt->compat_ioctl) {
3861
3862 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3863
3864 }
3865 return ret;
3866}
3867#endif
3868
3869
3870
3871/* Try to allocate a new tape buffer. Calling function must not hold
3872 dev_arr_lock. */
3873static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3874{
3875 struct st_buffer *tb;
3876
3877 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
3878 if (!tb) {
3879 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3880 return NULL;
3881 }
3882 tb->frp_segs = 0;
3883 tb->use_sg = max_sg;
3884 tb->dma = need_dma;
3885 tb->buffer_size = 0;
3886
3887 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3888 GFP_ATOMIC);
3889 if (!tb->reserved_pages) {
3890 kfree(tb);
3891 return NULL;
3892 }
3893
3894 return tb;
3895}
3896
3897
3898/* Try to allocate enough space in the tape buffer */
3899#define ST_MAX_ORDER 6
3900
3901static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3902{
3903 int segs, max_segs, b_size, order, got;
3904 gfp_t priority;
3905
3906 if (new_size <= STbuffer->buffer_size)
3907 return 1;
3908
3909 if (STbuffer->buffer_size <= PAGE_SIZE)
3910 normalize_buffer(STbuffer); /* Avoid extra segment */
3911
3912 max_segs = STbuffer->use_sg;
3913
3914 priority = GFP_KERNEL | __GFP_NOWARN;
3915 if (need_dma)
3916 priority |= GFP_DMA;
3917
3918 if (STbuffer->cleared)
3919 priority |= __GFP_ZERO;
3920
3921 if (STbuffer->frp_segs) {
3922 order = STbuffer->reserved_page_order;
3923 b_size = PAGE_SIZE << order;
3924 } else {
3925 for (b_size = PAGE_SIZE, order = 0;
3926 order < ST_MAX_ORDER &&
3927 max_segs * (PAGE_SIZE << order) < new_size;
3928 order++, b_size *= 2)
3929 ; /* empty */
3930 STbuffer->reserved_page_order = order;
3931 }
3932 if (max_segs * (PAGE_SIZE << order) < new_size) {
3933 if (order == ST_MAX_ORDER)
3934 return 0;
3935 normalize_buffer(STbuffer);
3936 return enlarge_buffer(STbuffer, new_size, need_dma);
3937 }
3938
3939 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3940 segs < max_segs && got < new_size;) {
3941 struct page *page;
3942
3943 page = alloc_pages(priority, order);
3944 if (!page) {
3945 DEB(STbuffer->buffer_size = got);
3946 normalize_buffer(STbuffer);
3947 return 0;
3948 }
3949
3950 STbuffer->frp_segs += 1;
3951 got += b_size;
3952 STbuffer->buffer_size = got;
3953 STbuffer->reserved_pages[segs] = page;
3954 segs++;
3955 }
3956 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3957
3958 return 1;
3959}
3960
3961
3962/* Make sure that no data from previous user is in the internal buffer */
3963static void clear_buffer(struct st_buffer * st_bp)
3964{
3965 int i;
3966
3967 for (i=0; i < st_bp->frp_segs; i++)
3968 memset(page_address(st_bp->reserved_pages[i]), 0,
3969 PAGE_SIZE << st_bp->reserved_page_order);
3970 st_bp->cleared = 1;
3971}
3972
3973
3974/* Release the extra buffer */
3975static void normalize_buffer(struct st_buffer * STbuffer)
3976{
3977 int i, order = STbuffer->reserved_page_order;
3978
3979 for (i = 0; i < STbuffer->frp_segs; i++) {
3980 __free_pages(STbuffer->reserved_pages[i], order);
3981 STbuffer->buffer_size -= (PAGE_SIZE << order);
3982 }
3983 STbuffer->frp_segs = 0;
3984 STbuffer->sg_segs = 0;
3985 STbuffer->reserved_page_order = 0;
3986 STbuffer->map_data.offset = 0;
3987}
3988
3989
3990/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3991 negative error code. */
3992static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3993{
3994 int i, cnt, res, offset;
3995 int length = PAGE_SIZE << st_bp->reserved_page_order;
3996
3997 for (i = 0, offset = st_bp->buffer_bytes;
3998 i < st_bp->frp_segs && offset >= length; i++)
3999 offset -= length;
4000 if (i == st_bp->frp_segs) { /* Should never happen */
4001 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4002 return (-EIO);
4003 }
4004 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4005 struct page *page = st_bp->reserved_pages[i];
4006 cnt = length - offset < do_count ? length - offset : do_count;
4007 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4008 if (res)
4009 return (-EFAULT);
4010 do_count -= cnt;
4011 st_bp->buffer_bytes += cnt;
4012 ubp += cnt;
4013 offset = 0;
4014 }
4015 if (do_count) /* Should never happen */
4016 return (-EIO);
4017
4018 return 0;
4019}
4020
4021
4022/* Move data from the tape buffer to the user buffer. Returns zero (success) or
4023 negative error code. */
4024static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4025{
4026 int i, cnt, res, offset;
4027 int length = PAGE_SIZE << st_bp->reserved_page_order;
4028
4029 for (i = 0, offset = st_bp->read_pointer;
4030 i < st_bp->frp_segs && offset >= length; i++)
4031 offset -= length;
4032 if (i == st_bp->frp_segs) { /* Should never happen */
4033 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4034 return (-EIO);
4035 }
4036 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4037 struct page *page = st_bp->reserved_pages[i];
4038 cnt = length - offset < do_count ? length - offset : do_count;
4039 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4040 if (res)
4041 return (-EFAULT);
4042 do_count -= cnt;
4043 st_bp->buffer_bytes -= cnt;
4044 st_bp->read_pointer += cnt;
4045 ubp += cnt;
4046 offset = 0;
4047 }
4048 if (do_count) /* Should never happen */
4049 return (-EIO);
4050
4051 return 0;
4052}
4053
4054
4055/* Move data towards start of buffer */
4056static void move_buffer_data(struct st_buffer * st_bp, int offset)
4057{
4058 int src_seg, dst_seg, src_offset = 0, dst_offset;
4059 int count, total;
4060 int length = PAGE_SIZE << st_bp->reserved_page_order;
4061
4062 if (offset == 0)
4063 return;
4064
4065 total=st_bp->buffer_bytes - offset;
4066 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4067 src_offset = offset;
4068 if (src_offset < length)
4069 break;
4070 offset -= length;
4071 }
4072
4073 st_bp->buffer_bytes = st_bp->read_pointer = total;
4074 for (dst_seg=dst_offset=0; total > 0; ) {
4075 struct page *dpage = st_bp->reserved_pages[dst_seg];
4076 struct page *spage = st_bp->reserved_pages[src_seg];
4077
4078 count = min(length - dst_offset, length - src_offset);
4079 memmove(page_address(dpage) + dst_offset,
4080 page_address(spage) + src_offset, count);
4081 src_offset += count;
4082 if (src_offset >= length) {
4083 src_seg++;
4084 src_offset = 0;
4085 }
4086 dst_offset += count;
4087 if (dst_offset >= length) {
4088 dst_seg++;
4089 dst_offset = 0;
4090 }
4091 total -= count;
4092 }
4093}
4094
4095/* Validate the options from command line or module parameters */
4096static void validate_options(void)
4097{
4098 if (buffer_kbs > 0)
4099 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4100 if (max_sg_segs >= ST_FIRST_SG)
4101 st_max_sg_segs = max_sg_segs;
4102}
4103
4104#ifndef MODULE
4105/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4106 */
4107static int __init st_setup(char *str)
4108{
4109 int i, len, ints[5];
4110 char *stp;
4111
4112 stp = get_options(str, ARRAY_SIZE(ints), ints);
4113
4114 if (ints[0] > 0) {
4115 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4116 if (parms[i].val)
4117 *parms[i].val = ints[i + 1];
4118 } else {
4119 while (stp != NULL) {
4120 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4121 len = strlen(parms[i].name);
4122 if (!strncmp(stp, parms[i].name, len) &&
4123 (*(stp + len) == ':' || *(stp + len) == '=')) {
4124 if (parms[i].val)
4125 *parms[i].val =
4126 simple_strtoul(stp + len + 1, NULL, 0);
4127 else
4128 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4129 parms[i].name);
4130 break;
4131 }
4132 }
4133 if (i >= ARRAY_SIZE(parms))
4134 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4135 stp);
4136 stp = strchr(stp, ',');
4137 if (stp)
4138 stp++;
4139 }
4140 }
4141
4142 validate_options();
4143
4144 return 1;
4145}
4146
4147__setup("st=", st_setup);
4148
4149#endif
4150
4151static const struct file_operations st_fops =
4152{
4153 .owner = THIS_MODULE,
4154 .read = st_read,
4155 .write = st_write,
4156 .unlocked_ioctl = st_ioctl,
4157#ifdef CONFIG_COMPAT
4158 .compat_ioctl = st_compat_ioctl,
4159#endif
4160 .open = st_open,
4161 .flush = st_flush,
4162 .release = st_release,
4163 .llseek = noop_llseek,
4164};
4165
4166static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4167{
4168 int i, error;
4169 dev_t cdev_devno;
4170 struct cdev *cdev;
4171 struct device *dev;
4172 struct st_modedef *STm = &(tape->modes[mode]);
4173 char name[10];
4174 int dev_num = tape->index;
4175
4176 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4177
4178 cdev = cdev_alloc();
4179 if (!cdev) {
4180 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4181 error = -ENOMEM;
4182 goto out;
4183 }
4184 cdev->owner = THIS_MODULE;
4185 cdev->ops = &st_fops;
4186 STm->cdevs[rew] = cdev;
4187
4188 error = cdev_add(cdev, cdev_devno, 1);
4189 if (error) {
4190 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4191 rew ? "non" : "auto", mode);
4192 pr_err("st%d: Device not attached.\n", dev_num);
4193 goto out_free;
4194 }
4195
4196 i = mode << (4 - ST_NBR_MODE_BITS);
4197 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4198 tape->disk->disk_name, st_formats[i]);
4199
4200 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4201 cdev_devno, &tape->modes[mode], "%s", name);
4202 if (IS_ERR(dev)) {
4203 pr_err("st%d: device_create failed\n", dev_num);
4204 error = PTR_ERR(dev);
4205 goto out_free;
4206 }
4207
4208 STm->devs[rew] = dev;
4209
4210 return 0;
4211out_free:
4212 cdev_del(STm->cdevs[rew]);
4213out:
4214 STm->cdevs[rew] = NULL;
4215 STm->devs[rew] = NULL;
4216 return error;
4217}
4218
4219static int create_cdevs(struct scsi_tape *tape)
4220{
4221 int mode, error;
4222 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4223 error = create_one_cdev(tape, mode, 0);
4224 if (error)
4225 return error;
4226 error = create_one_cdev(tape, mode, 1);
4227 if (error)
4228 return error;
4229 }
4230
4231 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4232 &tape->modes[0].devs[0]->kobj, "tape");
4233}
4234
4235static void remove_cdevs(struct scsi_tape *tape)
4236{
4237 int mode, rew;
4238 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4239 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4240 struct st_modedef *STm = &(tape->modes[mode]);
4241 for (rew = 0; rew < 2; rew++) {
4242 if (STm->cdevs[rew])
4243 cdev_del(STm->cdevs[rew]);
4244 if (STm->devs[rew])
4245 device_unregister(STm->devs[rew]);
4246 }
4247 }
4248}
4249
4250static int st_probe(struct device *dev)
4251{
4252 struct scsi_device *SDp = to_scsi_device(dev);
4253 struct gendisk *disk = NULL;
4254 struct scsi_tape *tpnt = NULL;
4255 struct st_modedef *STm;
4256 struct st_partstat *STps;
4257 struct st_buffer *buffer;
4258 int i, error;
4259 char *stp;
4260
4261 if (SDp->type != TYPE_TAPE)
4262 return -ENODEV;
4263 if ((stp = st_incompatible(SDp))) {
4264 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4265 sdev_printk(KERN_INFO, SDp,
4266 "st: The suggested driver is %s.\n", stp);
4267 return -ENODEV;
4268 }
4269
4270 scsi_autopm_get_device(SDp);
4271 i = queue_max_segments(SDp->request_queue);
4272 if (st_max_sg_segs < i)
4273 i = st_max_sg_segs;
4274 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4275 if (buffer == NULL) {
4276 sdev_printk(KERN_ERR, SDp,
4277 "st: Can't allocate new tape buffer. "
4278 "Device not attached.\n");
4279 goto out;
4280 }
4281
4282 disk = alloc_disk(1);
4283 if (!disk) {
4284 sdev_printk(KERN_ERR, SDp,
4285 "st: out of memory. Device not attached.\n");
4286 goto out_buffer_free;
4287 }
4288
4289 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
4290 if (tpnt == NULL) {
4291 sdev_printk(KERN_ERR, SDp,
4292 "st: Can't allocate device descriptor.\n");
4293 goto out_put_disk;
4294 }
4295 kref_init(&tpnt->kref);
4296 tpnt->disk = disk;
4297 disk->private_data = &tpnt->driver;
4298 disk->queue = SDp->request_queue;
4299 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4300 * take queue reference that release_disk() expects. */
4301 if (!blk_get_queue(disk->queue))
4302 goto out_put_disk;
4303 tpnt->driver = &st_template;
4304
4305 tpnt->device = SDp;
4306 if (SDp->scsi_level <= 2)
4307 tpnt->tape_type = MT_ISSCSI1;
4308 else
4309 tpnt->tape_type = MT_ISSCSI2;
4310
4311 tpnt->buffer = buffer;
4312 tpnt->buffer->last_SRpnt = NULL;
4313
4314 tpnt->inited = 0;
4315 tpnt->dirty = 0;
4316 tpnt->in_use = 0;
4317 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4318 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4319 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4320 tpnt->density = 0;
4321 tpnt->do_auto_lock = ST_AUTO_LOCK;
4322 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4323 tpnt->can_partitions = 0;
4324 tpnt->two_fm = ST_TWO_FM;
4325 tpnt->fast_mteom = ST_FAST_MTEOM;
4326 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4327 tpnt->sili = ST_SILI;
4328 tpnt->immediate = ST_NOWAIT;
4329 tpnt->immediate_filemark = 0;
4330 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4331 tpnt->partition = 0;
4332 tpnt->new_partition = 0;
4333 tpnt->nbr_partitions = 0;
4334 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4335 tpnt->long_timeout = ST_LONG_TIMEOUT;
4336 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4337
4338 for (i = 0; i < ST_NBR_MODES; i++) {
4339 STm = &(tpnt->modes[i]);
4340 STm->defined = 0;
4341 STm->sysv = ST_SYSV;
4342 STm->defaults_for_writes = 0;
4343 STm->do_async_writes = ST_ASYNC_WRITES;
4344 STm->do_buffer_writes = ST_BUFFER_WRITES;
4345 STm->do_read_ahead = ST_READ_AHEAD;
4346 STm->default_compression = ST_DONT_TOUCH;
4347 STm->default_blksize = (-1); /* No forced size */
4348 STm->default_density = (-1); /* No forced density */
4349 STm->tape = tpnt;
4350 }
4351
4352 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4353 STps = &(tpnt->ps[i]);
4354 STps->rw = ST_IDLE;
4355 STps->eof = ST_NOEOF;
4356 STps->at_sm = 0;
4357 STps->last_block_valid = 0;
4358 STps->drv_block = (-1);
4359 STps->drv_file = (-1);
4360 }
4361
4362 tpnt->current_mode = 0;
4363 tpnt->modes[0].defined = 1;
4364
4365 tpnt->density_changed = tpnt->compression_changed =
4366 tpnt->blksize_changed = 0;
4367 mutex_init(&tpnt->lock);
4368
4369 idr_preload(GFP_KERNEL);
4370 spin_lock(&st_index_lock);
4371 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4372 spin_unlock(&st_index_lock);
4373 idr_preload_end();
4374 if (error < 0) {
4375 pr_warn("st: idr allocation failed: %d\n", error);
4376 goto out_put_queue;
4377 }
4378 tpnt->index = error;
4379 sprintf(disk->disk_name, "st%d", tpnt->index);
4380 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4381 if (tpnt->stats == NULL) {
4382 sdev_printk(KERN_ERR, SDp,
4383 "st: Can't allocate statistics.\n");
4384 goto out_idr_remove;
4385 }
4386
4387 dev_set_drvdata(dev, tpnt);
4388
4389
4390 error = create_cdevs(tpnt);
4391 if (error)
4392 goto out_remove_devs;
4393 scsi_autopm_put_device(SDp);
4394
4395 sdev_printk(KERN_NOTICE, SDp,
4396 "Attached scsi tape %s\n", tape_name(tpnt));
4397 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4398 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4399 queue_dma_alignment(SDp->request_queue) + 1);
4400
4401 return 0;
4402
4403out_remove_devs:
4404 remove_cdevs(tpnt);
4405 kfree(tpnt->stats);
4406out_idr_remove:
4407 spin_lock(&st_index_lock);
4408 idr_remove(&st_index_idr, tpnt->index);
4409 spin_unlock(&st_index_lock);
4410out_put_queue:
4411 blk_put_queue(disk->queue);
4412out_put_disk:
4413 put_disk(disk);
4414 kfree(tpnt);
4415out_buffer_free:
4416 kfree(buffer);
4417out:
4418 scsi_autopm_put_device(SDp);
4419 return -ENODEV;
4420};
4421
4422
4423static int st_remove(struct device *dev)
4424{
4425 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4426 int index = tpnt->index;
4427
4428 scsi_autopm_get_device(to_scsi_device(dev));
4429 remove_cdevs(tpnt);
4430
4431 mutex_lock(&st_ref_mutex);
4432 kref_put(&tpnt->kref, scsi_tape_release);
4433 mutex_unlock(&st_ref_mutex);
4434 spin_lock(&st_index_lock);
4435 idr_remove(&st_index_idr, index);
4436 spin_unlock(&st_index_lock);
4437 return 0;
4438}
4439
4440/**
4441 * scsi_tape_release - Called to free the Scsi_Tape structure
4442 * @kref: pointer to embedded kref
4443 *
4444 * st_ref_mutex must be held entering this routine. Because it is
4445 * called on last put, you should always use the scsi_tape_get()
4446 * scsi_tape_put() helpers which manipulate the semaphore directly
4447 * and never do a direct kref_put().
4448 **/
4449static void scsi_tape_release(struct kref *kref)
4450{
4451 struct scsi_tape *tpnt = to_scsi_tape(kref);
4452 struct gendisk *disk = tpnt->disk;
4453
4454 tpnt->device = NULL;
4455
4456 if (tpnt->buffer) {
4457 normalize_buffer(tpnt->buffer);
4458 kfree(tpnt->buffer->reserved_pages);
4459 kfree(tpnt->buffer);
4460 }
4461
4462 disk->private_data = NULL;
4463 put_disk(disk);
4464 kfree(tpnt->stats);
4465 kfree(tpnt);
4466 return;
4467}
4468
4469static struct class st_sysfs_class = {
4470 .name = "scsi_tape",
4471 .dev_groups = st_dev_groups,
4472};
4473
4474static int __init init_st(void)
4475{
4476 int err;
4477
4478 validate_options();
4479
4480 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4481 verstr, st_fixed_buffer_size, st_max_sg_segs);
4482
4483 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4484 if (debugging) {
4485 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4486 debugging);
4487 }
4488
4489 err = class_register(&st_sysfs_class);
4490 if (err) {
4491 pr_err("Unable register sysfs class for SCSI tapes\n");
4492 return err;
4493 }
4494
4495 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4496 ST_MAX_TAPE_ENTRIES, "st");
4497 if (err) {
4498 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4499 SCSI_TAPE_MAJOR);
4500 goto err_class;
4501 }
4502
4503 err = scsi_register_driver(&st_template.gendrv);
4504 if (err)
4505 goto err_chrdev;
4506
4507 return 0;
4508
4509err_chrdev:
4510 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4511 ST_MAX_TAPE_ENTRIES);
4512err_class:
4513 class_unregister(&st_sysfs_class);
4514 return err;
4515}
4516
4517static void __exit exit_st(void)
4518{
4519 scsi_unregister_driver(&st_template.gendrv);
4520 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4521 ST_MAX_TAPE_ENTRIES);
4522 class_unregister(&st_sysfs_class);
4523 idr_destroy(&st_index_idr);
4524 printk(KERN_INFO "st: Unloaded.\n");
4525}
4526
4527module_init(init_st);
4528module_exit(exit_st);
4529
4530
4531/* The sysfs driver interface. Read-only at the moment */
4532static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4533{
4534 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4535}
4536static DRIVER_ATTR_RO(try_direct_io);
4537
4538static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4539{
4540 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4541}
4542static DRIVER_ATTR_RO(fixed_buffer_size);
4543
4544static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4545{
4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4547}
4548static DRIVER_ATTR_RO(max_sg_segs);
4549
4550static ssize_t version_show(struct device_driver *ddd, char *buf)
4551{
4552 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4553}
4554static DRIVER_ATTR_RO(version);
4555
4556#if DEBUG
4557static ssize_t debug_flag_store(struct device_driver *ddp,
4558 const char *buf, size_t count)
4559{
4560/* We only care what the first byte of the data is the rest is unused.
4561 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4562 * other values have -EINVAL returned if they are passed in.
4563 */
4564 if (count > 0) {
4565 if (buf[0] == '0') {
4566 debugging = NO_DEBUG;
4567 return count;
4568 } else if (buf[0] == '1') {
4569 debugging = 1;
4570 return count;
4571 }
4572 }
4573 return -EINVAL;
4574}
4575
4576static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4577{
4578 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4579}
4580static DRIVER_ATTR_RW(debug_flag);
4581#endif
4582
4583static struct attribute *st_drv_attrs[] = {
4584 &driver_attr_try_direct_io.attr,
4585 &driver_attr_fixed_buffer_size.attr,
4586 &driver_attr_max_sg_segs.attr,
4587 &driver_attr_version.attr,
4588#if DEBUG
4589 &driver_attr_debug_flag.attr,
4590#endif
4591 NULL,
4592};
4593ATTRIBUTE_GROUPS(st_drv);
4594
4595/* The sysfs simple class interface */
4596static ssize_t
4597defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4598{
4599 struct st_modedef *STm = dev_get_drvdata(dev);
4600 ssize_t l = 0;
4601
4602 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4603 return l;
4604}
4605static DEVICE_ATTR_RO(defined);
4606
4607static ssize_t
4608default_blksize_show(struct device *dev, struct device_attribute *attr,
4609 char *buf)
4610{
4611 struct st_modedef *STm = dev_get_drvdata(dev);
4612 ssize_t l = 0;
4613
4614 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4615 return l;
4616}
4617static DEVICE_ATTR_RO(default_blksize);
4618
4619static ssize_t
4620default_density_show(struct device *dev, struct device_attribute *attr,
4621 char *buf)
4622{
4623 struct st_modedef *STm = dev_get_drvdata(dev);
4624 ssize_t l = 0;
4625 char *fmt;
4626
4627 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4628 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4629 return l;
4630}
4631static DEVICE_ATTR_RO(default_density);
4632
4633static ssize_t
4634default_compression_show(struct device *dev, struct device_attribute *attr,
4635 char *buf)
4636{
4637 struct st_modedef *STm = dev_get_drvdata(dev);
4638 ssize_t l = 0;
4639
4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4641 return l;
4642}
4643static DEVICE_ATTR_RO(default_compression);
4644
4645static ssize_t
4646options_show(struct device *dev, struct device_attribute *attr, char *buf)
4647{
4648 struct st_modedef *STm = dev_get_drvdata(dev);
4649 struct scsi_tape *STp = STm->tape;
4650 int options;
4651 ssize_t l = 0;
4652
4653 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4654 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4655 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4656 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4657 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4658 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4659 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4660 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4661 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4662 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4663 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4664 options |= STm->sysv ? MT_ST_SYSV : 0;
4665 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4666 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4667 options |= STp->sili ? MT_ST_SILI : 0;
4668
4669 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4670 return l;
4671}
4672static DEVICE_ATTR_RO(options);
4673
4674/* Support for tape stats */
4675
4676/**
4677 * read_cnt_show - return read count - count of reads made from tape drive
4678 * @dev: struct device
4679 * @attr: attribute structure
4680 * @buf: buffer to return formatted data in
4681 */
4682static ssize_t read_cnt_show(struct device *dev,
4683 struct device_attribute *attr, char *buf)
4684{
4685 struct st_modedef *STm = dev_get_drvdata(dev);
4686
4687 return sprintf(buf, "%lld",
4688 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4689}
4690static DEVICE_ATTR_RO(read_cnt);
4691
4692/**
4693 * read_byte_cnt_show - return read byte count - tape drives
4694 * may use blocks less than 512 bytes this gives the raw byte count of
4695 * of data read from the tape drive.
4696 * @dev: struct device
4697 * @attr: attribute structure
4698 * @buf: buffer to return formatted data in
4699 */
4700static ssize_t read_byte_cnt_show(struct device *dev,
4701 struct device_attribute *attr, char *buf)
4702{
4703 struct st_modedef *STm = dev_get_drvdata(dev);
4704
4705 return sprintf(buf, "%lld",
4706 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4707}
4708static DEVICE_ATTR_RO(read_byte_cnt);
4709
4710/**
4711 * read_us_show - return read us - overall time spent waiting on reads in ns.
4712 * @dev: struct device
4713 * @attr: attribute structure
4714 * @buf: buffer to return formatted data in
4715 */
4716static ssize_t read_ns_show(struct device *dev,
4717 struct device_attribute *attr, char *buf)
4718{
4719 struct st_modedef *STm = dev_get_drvdata(dev);
4720
4721 return sprintf(buf, "%lld",
4722 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4723}
4724static DEVICE_ATTR_RO(read_ns);
4725
4726/**
4727 * write_cnt_show - write count - number of user calls
4728 * to write(2) that have written data to tape.
4729 * @dev: struct device
4730 * @attr: attribute structure
4731 * @buf: buffer to return formatted data in
4732 */
4733static ssize_t write_cnt_show(struct device *dev,
4734 struct device_attribute *attr, char *buf)
4735{
4736 struct st_modedef *STm = dev_get_drvdata(dev);
4737
4738 return sprintf(buf, "%lld",
4739 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4740}
4741static DEVICE_ATTR_RO(write_cnt);
4742
4743/**
4744 * write_byte_cnt_show - write byte count - raw count of
4745 * bytes written to tape.
4746 * @dev: struct device
4747 * @attr: attribute structure
4748 * @buf: buffer to return formatted data in
4749 */
4750static ssize_t write_byte_cnt_show(struct device *dev,
4751 struct device_attribute *attr, char *buf)
4752{
4753 struct st_modedef *STm = dev_get_drvdata(dev);
4754
4755 return sprintf(buf, "%lld",
4756 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4757}
4758static DEVICE_ATTR_RO(write_byte_cnt);
4759
4760/**
4761 * write_ns_show - write ns - number of nanoseconds waiting on write
4762 * requests to complete.
4763 * @dev: struct device
4764 * @attr: attribute structure
4765 * @buf: buffer to return formatted data in
4766 */
4767static ssize_t write_ns_show(struct device *dev,
4768 struct device_attribute *attr, char *buf)
4769{
4770 struct st_modedef *STm = dev_get_drvdata(dev);
4771
4772 return sprintf(buf, "%lld",
4773 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4774}
4775static DEVICE_ATTR_RO(write_ns);
4776
4777/**
4778 * in_flight_show - number of I/Os currently in flight -
4779 * in most cases this will be either 0 or 1. It may be higher if someone
4780 * has also issued other SCSI commands such as via an ioctl.
4781 * @dev: struct device
4782 * @attr: attribute structure
4783 * @buf: buffer to return formatted data in
4784 */
4785static ssize_t in_flight_show(struct device *dev,
4786 struct device_attribute *attr, char *buf)
4787{
4788 struct st_modedef *STm = dev_get_drvdata(dev);
4789
4790 return sprintf(buf, "%lld",
4791 (long long)atomic64_read(&STm->tape->stats->in_flight));
4792}
4793static DEVICE_ATTR_RO(in_flight);
4794
4795/**
4796 * io_ns_show - io wait ns - this is the number of ns spent
4797 * waiting on all I/O to complete. This includes tape movement commands
4798 * such as rewinding, seeking to end of file or tape, it also includes
4799 * read and write. To determine the time spent on tape movement
4800 * subtract the read and write ns from this value.
4801 * @dev: struct device
4802 * @attr: attribute structure
4803 * @buf: buffer to return formatted data in
4804 */
4805static ssize_t io_ns_show(struct device *dev,
4806 struct device_attribute *attr, char *buf)
4807{
4808 struct st_modedef *STm = dev_get_drvdata(dev);
4809
4810 return sprintf(buf, "%lld",
4811 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4812}
4813static DEVICE_ATTR_RO(io_ns);
4814
4815/**
4816 * other_cnt_show - other io count - this is the number of
4817 * I/O requests other than read and write requests.
4818 * Typically these are tape movement requests but will include driver
4819 * tape movement. This includes only requests issued by the st driver.
4820 * @dev: struct device
4821 * @attr: attribute structure
4822 * @buf: buffer to return formatted data in
4823 */
4824static ssize_t other_cnt_show(struct device *dev,
4825 struct device_attribute *attr, char *buf)
4826{
4827 struct st_modedef *STm = dev_get_drvdata(dev);
4828
4829 return sprintf(buf, "%lld",
4830 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4831}
4832static DEVICE_ATTR_RO(other_cnt);
4833
4834/**
4835 * resid_cnt_show - A count of the number of times we get a residual
4836 * count - this should indicate someone issuing reads larger than the
4837 * block size on tape.
4838 * @dev: struct device
4839 * @attr: attribute structure
4840 * @buf: buffer to return formatted data in
4841 */
4842static ssize_t resid_cnt_show(struct device *dev,
4843 struct device_attribute *attr, char *buf)
4844{
4845 struct st_modedef *STm = dev_get_drvdata(dev);
4846
4847 return sprintf(buf, "%lld",
4848 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4849}
4850static DEVICE_ATTR_RO(resid_cnt);
4851
4852static struct attribute *st_dev_attrs[] = {
4853 &dev_attr_defined.attr,
4854 &dev_attr_default_blksize.attr,
4855 &dev_attr_default_density.attr,
4856 &dev_attr_default_compression.attr,
4857 &dev_attr_options.attr,
4858 NULL,
4859};
4860
4861static struct attribute *st_stats_attrs[] = {
4862 &dev_attr_read_cnt.attr,
4863 &dev_attr_read_byte_cnt.attr,
4864 &dev_attr_read_ns.attr,
4865 &dev_attr_write_cnt.attr,
4866 &dev_attr_write_byte_cnt.attr,
4867 &dev_attr_write_ns.attr,
4868 &dev_attr_in_flight.attr,
4869 &dev_attr_io_ns.attr,
4870 &dev_attr_other_cnt.attr,
4871 &dev_attr_resid_cnt.attr,
4872 NULL,
4873};
4874
4875static struct attribute_group stats_group = {
4876 .name = "stats",
4877 .attrs = st_stats_attrs,
4878};
4879
4880static struct attribute_group st_group = {
4881 .attrs = st_dev_attrs,
4882};
4883
4884static const struct attribute_group *st_dev_groups[] = {
4885 &st_group,
4886 &stats_group,
4887 NULL,
4888};
4889
4890/* The following functions may be useful for a larger audience. */
4891static int sgl_map_user_pages(struct st_buffer *STbp,
4892 const unsigned int max_pages, unsigned long uaddr,
4893 size_t count, int rw)
4894{
4895 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4896 unsigned long start = uaddr >> PAGE_SHIFT;
4897 const int nr_pages = end - start;
4898 int res, i, j;
4899 struct page **pages;
4900 struct rq_map_data *mdata = &STbp->map_data;
4901
4902 /* User attempted Overflow! */
4903 if ((uaddr + count) < uaddr)
4904 return -EINVAL;
4905
4906 /* Too big */
4907 if (nr_pages > max_pages)
4908 return -ENOMEM;
4909
4910 /* Hmm? */
4911 if (count == 0)
4912 return 0;
4913
4914 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4915 return -ENOMEM;
4916
4917 /* Try to fault in all of the necessary pages */
4918 /* rw==READ means read from drive, write into memory area */
4919 res = get_user_pages_unlocked(
4920 uaddr,
4921 nr_pages,
4922 rw == READ,
4923 0, /* don't force */
4924 pages);
4925
4926 /* Errors and no page mapped should return here */
4927 if (res < nr_pages)
4928 goto out_unmap;
4929
4930 for (i=0; i < nr_pages; i++) {
4931 /* FIXME: flush superflous for rw==READ,
4932 * probably wrong function for rw==WRITE
4933 */
4934 flush_dcache_page(pages[i]);
4935 }
4936
4937 mdata->offset = uaddr & ~PAGE_MASK;
4938 STbp->mapped_pages = pages;
4939
4940 return nr_pages;
4941 out_unmap:
4942 if (res > 0) {
4943 for (j=0; j < res; j++)
4944 put_page(pages[j]);
4945 res = 0;
4946 }
4947 kfree(pages);
4948 return res;
4949}
4950
4951
4952/* And unmap them... */
4953static int sgl_unmap_user_pages(struct st_buffer *STbp,
4954 const unsigned int nr_pages, int dirtied)
4955{
4956 int i;
4957
4958 for (i=0; i < nr_pages; i++) {
4959 struct page *page = STbp->mapped_pages[i];
4960
4961 if (dirtied)
4962 SetPageDirty(page);
4963 /* FIXME: cache flush missing for rw==READ
4964 * FIXME: call the correct reference counting function
4965 */
4966 put_page(page);
4967 }
4968 kfree(STbp->mapped_pages);
4969 STbp->mapped_pages = NULL;
4970
4971 return 0;
4972}