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