1 // SPDX-License-Identifier: GPL-2.0-only
3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
4 file Documentation/scsi/st.rst for more information.
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.
13 Copyright 1992 - 2016 Kai Makisara
14 email Kai.Makisara@kolumbus.fi
16 Some small formal changes - aeb, 950809
18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
21 static const char *verstr
= "20160209";
23 #include <linux/module.h>
25 #include <linux/compat.h>
27 #include <linux/kernel.h>
28 #include <linux/sched/signal.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/cdrom.h>
36 #include <linux/ioctl.h>
37 #include <linux/fcntl.h>
38 #include <linux/spinlock.h>
39 #include <linux/blkdev.h>
40 #include <linux/moduleparam.h>
41 #include <linux/cdev.h>
42 #include <linux/idr.h>
43 #include <linux/delay.h>
44 #include <linux/mutex.h>
46 #include <linux/uaccess.h>
48 #include <asm/unaligned.h>
50 #include <scsi/scsi.h>
51 #include <scsi/scsi_dbg.h>
52 #include <scsi/scsi_device.h>
53 #include <scsi/scsi_driver.h>
54 #include <scsi/scsi_eh.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_ioctl.h>
60 /* The driver prints some debugging information on the console if DEBUG
61 is defined and non-zero. */
65 #define ST_DEB_MSG KERN_NOTICE
67 /* The message level for the debug messages is currently set to KERN_NOTICE
68 so that people can easily see the messages. Later when the debugging messages
69 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
71 #define DEBC(a) if (debugging) { a ; }
77 #define ST_KILOBYTE 1024
79 #include "st_options.h"
82 static int buffer_kbs
;
83 static int max_sg_segs
;
84 static int try_direct_io
= TRY_DIRECT_IO
;
85 static int try_rdio
= 1;
86 static int try_wdio
= 1;
87 static int debug_flag
;
89 static struct class st_sysfs_class
;
90 static const struct attribute_group
*st_dev_groups
[];
91 static const struct attribute_group
*st_drv_groups
[];
93 MODULE_AUTHOR("Kai Makisara");
94 MODULE_DESCRIPTION("SCSI tape (st) driver");
95 MODULE_LICENSE("GPL");
96 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR
);
97 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE
);
99 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
100 * of sysfs parameters (which module_param doesn't yet support).
101 * Sysfs parameters defined explicitly later.
103 module_param_named(buffer_kbs
, buffer_kbs
, int, 0);
104 MODULE_PARM_DESC(buffer_kbs
, "Default driver buffer size for fixed block mode (KB; 32)");
105 module_param_named(max_sg_segs
, max_sg_segs
, int, 0);
106 MODULE_PARM_DESC(max_sg_segs
, "Maximum number of scatter/gather segments to use (256)");
107 module_param_named(try_direct_io
, try_direct_io
, int, 0);
108 MODULE_PARM_DESC(try_direct_io
, "Try direct I/O between user buffer and tape drive (1)");
109 module_param_named(debug_flag
, debug_flag
, int, 0);
110 MODULE_PARM_DESC(debug_flag
, "Enable DEBUG, same as setting debugging=1");
113 /* Extra parameters for testing */
114 module_param_named(try_rdio
, try_rdio
, int, 0);
115 MODULE_PARM_DESC(try_rdio
, "Try direct read i/o when possible");
116 module_param_named(try_wdio
, try_wdio
, int, 0);
117 MODULE_PARM_DESC(try_wdio
, "Try direct write i/o when possible");
120 static int write_threshold_kbs
; /* retained for compatibility */
121 static struct st_dev_parm
{
124 } parms
[] __initdata
= {
126 "buffer_kbs", &buffer_kbs
128 { /* Retained for compatibility with 2.4 */
129 "write_threshold_kbs", &write_threshold_kbs
135 "try_direct_io", &try_direct_io
138 "debug_flag", &debug_flag
143 /* Restrict the number of modes so that names for all are assigned */
144 #if ST_NBR_MODES > 16
145 #error "Maximum number of modes is 16"
147 /* Bit reversed order to get same names for same minors with all
149 static const char *st_formats
[] = {
150 "", "r", "k", "s", "l", "t", "o", "u",
151 "m", "v", "p", "x", "a", "y", "q", "z"};
153 /* The default definitions have been moved to st_options.h */
155 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
157 /* The buffer size should fit into the 24 bits for length in the
158 6-byte SCSI read and write commands. */
159 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
160 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
163 static int debugging
= DEBUG
;
165 #define MAX_RETRIES 0
166 #define MAX_WRITE_RETRIES 0
167 #define MAX_READY_RETRIES 0
168 #define NO_TAPE NOT_READY
170 #define ST_TIMEOUT (900 * HZ)
171 #define ST_LONG_TIMEOUT (14000 * HZ)
173 /* Remove mode bits and auto-rewind bit (7) */
174 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
175 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
176 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
178 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
179 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
180 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
182 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
184 #define SET_DENS_AND_BLK 0x10001
186 static int st_fixed_buffer_size
= ST_FIXED_BUFFER_SIZE
;
187 static int st_max_sg_segs
= ST_MAX_SG
;
189 static int modes_defined
;
191 static int enlarge_buffer(struct st_buffer
*, int, int);
192 static void clear_buffer(struct st_buffer
*);
193 static void normalize_buffer(struct st_buffer
*);
194 static int append_to_buffer(const char __user
*, struct st_buffer
*, int);
195 static int from_buffer(struct st_buffer
*, char __user
*, int);
196 static void move_buffer_data(struct st_buffer
*, int);
198 static int sgl_map_user_pages(struct st_buffer
*, const unsigned int,
199 unsigned long, size_t, int);
200 static int sgl_unmap_user_pages(struct st_buffer
*, const unsigned int, int);
202 static int st_probe(struct device
*);
203 static int st_remove(struct device
*);
205 static struct scsi_driver st_template
= {
208 .owner
= THIS_MODULE
,
211 .groups
= st_drv_groups
,
215 static int st_compression(struct scsi_tape
*, int);
217 static int find_partition(struct scsi_tape
*);
218 static int switch_partition(struct scsi_tape
*);
220 static int st_int_ioctl(struct scsi_tape
*, unsigned int, unsigned long);
222 static void scsi_tape_release(struct kref
*);
224 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
226 static DEFINE_MUTEX(st_ref_mutex
);
227 static DEFINE_SPINLOCK(st_index_lock
);
228 static DEFINE_SPINLOCK(st_use_lock
);
229 static DEFINE_IDR(st_index_idr
);
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"}
242 static struct scsi_tape
*scsi_tape_get(int dev
)
244 struct scsi_tape
*STp
= NULL
;
246 mutex_lock(&st_ref_mutex
);
247 spin_lock(&st_index_lock
);
249 STp
= idr_find(&st_index_idr
, dev
);
252 kref_get(&STp
->kref
);
257 if (scsi_device_get(STp
->device
))
263 kref_put(&STp
->kref
, scsi_tape_release
);
266 spin_unlock(&st_index_lock
);
267 mutex_unlock(&st_ref_mutex
);
271 static void scsi_tape_put(struct scsi_tape
*STp
)
273 struct scsi_device
*sdev
= STp
->device
;
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
);
281 struct st_reject_data
{
285 char *driver_hint
; /* Name of the correct driver, NULL if unknown */
288 static struct st_reject_data reject_list
[] = {
289 /* {"XXX", "Yy-", "", NULL}, example */
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) */
295 static char * st_incompatible(struct scsi_device
* SDp
)
297 struct st_reject_data
*rp
;
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
))) {
304 return rp
->driver_hint
;
312 static inline char *tape_name(struct scsi_tape
*tape
)
314 return tape
->disk
->disk_name
;
317 #define st_printk(prefix, t, fmt, a...) \
318 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
320 #define DEBC_printk(t, fmt, a...) \
321 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
323 #define DEBC_printk(t, fmt, a...)
326 static void st_analyze_sense(struct st_request
*SRpnt
, struct st_cmdstatus
*s
)
329 const u8
*sense
= SRpnt
->sense
;
331 s
->have_sense
= scsi_normalize_sense(SRpnt
->sense
,
332 SCSI_SENSE_BUFFERSIZE
, &s
->sense_hdr
);
338 scsi_get_sense_info_fld(sense
, SCSI_SENSE_BUFFERSIZE
, &s
->uremainder64
);
339 switch (sense
[0] & 0x7f) {
345 s
->flags
= sense
[2] & 0xe0;
352 ucp
= scsi_sense_desc_find(sense
, SCSI_SENSE_BUFFERSIZE
, 4);
353 s
->flags
= ucp
? (ucp
[3] & 0xe0) : 0;
360 /* Convert the result to success code */
361 static int st_chk_result(struct scsi_tape
*STp
, struct st_request
* SRpnt
)
363 int result
= SRpnt
->result
;
365 DEB(const char *stp
;)
366 char *name
= tape_name(STp
);
367 struct st_cmdstatus
*cmdstatp
;
372 cmdstatp
= &STp
->buffer
->cmdstat
;
373 st_analyze_sense(SRpnt
, cmdstatp
);
375 if (cmdstatp
->have_sense
)
376 scode
= STp
->buffer
->cmdstat
.sense_hdr
.sense_key
;
382 st_printk(ST_DEB_MSG
, STp
,
383 "Error: %x, cmd: %x %x %x %x %x %x\n", result
,
384 SRpnt
->cmd
[0], SRpnt
->cmd
[1], SRpnt
->cmd
[2],
385 SRpnt
->cmd
[3], SRpnt
->cmd
[4], SRpnt
->cmd
[5]);
386 if (cmdstatp
->have_sense
)
387 __scsi_print_sense(STp
->device
, name
,
388 SRpnt
->sense
, SCSI_SENSE_BUFFERSIZE
);
390 if (!debugging
) { /* Abnormal conditions for tape */
391 if (!cmdstatp
->have_sense
)
392 st_printk(KERN_WARNING
, STp
,
393 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
394 result
, driver_byte(result
), host_byte(result
));
395 else if (cmdstatp
->have_sense
&&
397 scode
!= RECOVERED_ERROR
&&
398 /* scode != UNIT_ATTENTION && */
399 scode
!= BLANK_CHECK
&&
400 scode
!= VOLUME_OVERFLOW
&&
401 SRpnt
->cmd
[0] != MODE_SENSE
&&
402 SRpnt
->cmd
[0] != TEST_UNIT_READY
) {
404 __scsi_print_sense(STp
->device
, name
,
405 SRpnt
->sense
, SCSI_SENSE_BUFFERSIZE
);
409 if (cmdstatp
->fixed_format
&&
410 STp
->cln_mode
>= EXTENDED_SENSE_START
) { /* Only fixed format sense */
411 if (STp
->cln_sense_value
)
412 STp
->cleaning_req
|= ((SRpnt
->sense
[STp
->cln_mode
] &
413 STp
->cln_sense_mask
) == STp
->cln_sense_value
);
415 STp
->cleaning_req
|= ((SRpnt
->sense
[STp
->cln_mode
] &
416 STp
->cln_sense_mask
) != 0);
418 if (cmdstatp
->have_sense
&&
419 cmdstatp
->sense_hdr
.asc
== 0 && cmdstatp
->sense_hdr
.ascq
== 0x17)
420 STp
->cleaning_req
= 1; /* ASC and ASCQ => cleaning requested */
422 STp
->pos_unknown
|= STp
->device
->was_reset
;
424 if (cmdstatp
->have_sense
&&
425 scode
== RECOVERED_ERROR
426 #if ST_RECOVERED_WRITE_FATAL
427 && SRpnt
->cmd
[0] != WRITE_6
428 && SRpnt
->cmd
[0] != WRITE_FILEMARKS
431 STp
->recover_count
++;
436 if (SRpnt
->cmd
[0] == READ_6
)
438 else if (SRpnt
->cmd
[0] == WRITE_6
)
442 st_printk(ST_DEB_MSG
, STp
,
443 "Recovered %s error (%d).\n",
444 stp
, STp
->recover_count
);
447 if (cmdstatp
->flags
== 0)
453 static struct st_request
*st_allocate_request(struct scsi_tape
*stp
)
455 struct st_request
*streq
;
457 streq
= kzalloc(sizeof(*streq
), GFP_KERNEL
);
461 st_printk(KERN_ERR
, stp
,
462 "Can't get SCSI request.\n");
463 if (signal_pending(current
))
464 stp
->buffer
->syscall_result
= -EINTR
;
466 stp
->buffer
->syscall_result
= -EBUSY
;
472 static void st_release_request(struct st_request
*streq
)
477 static void st_do_stats(struct scsi_tape
*STp
, struct request
*req
)
482 if (scsi_req(req
)->cmd
[0] == WRITE_6
) {
483 now
= ktime_sub(now
, STp
->stats
->write_time
);
484 atomic64_add(ktime_to_ns(now
), &STp
->stats
->tot_write_time
);
485 atomic64_add(ktime_to_ns(now
), &STp
->stats
->tot_io_time
);
486 atomic64_inc(&STp
->stats
->write_cnt
);
487 if (scsi_req(req
)->result
) {
488 atomic64_add(atomic_read(&STp
->stats
->last_write_size
)
489 - STp
->buffer
->cmdstat
.residual
,
490 &STp
->stats
->write_byte_cnt
);
491 if (STp
->buffer
->cmdstat
.residual
> 0)
492 atomic64_inc(&STp
->stats
->resid_cnt
);
494 atomic64_add(atomic_read(&STp
->stats
->last_write_size
),
495 &STp
->stats
->write_byte_cnt
);
496 } else if (scsi_req(req
)->cmd
[0] == READ_6
) {
497 now
= ktime_sub(now
, STp
->stats
->read_time
);
498 atomic64_add(ktime_to_ns(now
), &STp
->stats
->tot_read_time
);
499 atomic64_add(ktime_to_ns(now
), &STp
->stats
->tot_io_time
);
500 atomic64_inc(&STp
->stats
->read_cnt
);
501 if (scsi_req(req
)->result
) {
502 atomic64_add(atomic_read(&STp
->stats
->last_read_size
)
503 - STp
->buffer
->cmdstat
.residual
,
504 &STp
->stats
->read_byte_cnt
);
505 if (STp
->buffer
->cmdstat
.residual
> 0)
506 atomic64_inc(&STp
->stats
->resid_cnt
);
508 atomic64_add(atomic_read(&STp
->stats
->last_read_size
),
509 &STp
->stats
->read_byte_cnt
);
511 now
= ktime_sub(now
, STp
->stats
->other_time
);
512 atomic64_add(ktime_to_ns(now
), &STp
->stats
->tot_io_time
);
513 atomic64_inc(&STp
->stats
->other_cnt
);
515 atomic64_dec(&STp
->stats
->in_flight
);
518 static void st_scsi_execute_end(struct request
*req
, blk_status_t status
)
520 struct st_request
*SRpnt
= req
->end_io_data
;
521 struct scsi_request
*rq
= scsi_req(req
);
522 struct scsi_tape
*STp
= SRpnt
->stp
;
525 STp
->buffer
->cmdstat
.midlevel_result
= SRpnt
->result
= rq
->result
;
526 STp
->buffer
->cmdstat
.residual
= rq
->resid_len
;
528 st_do_stats(STp
, req
);
532 memcpy(SRpnt
->sense
, rq
->sense
, SCSI_SENSE_BUFFERSIZE
);
534 complete(SRpnt
->waiting
);
536 blk_rq_unmap_user(tmp
);
537 blk_put_request(req
);
540 static 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
)
545 struct scsi_request
*rq
;
546 struct rq_map_data
*mdata
= &SRpnt
->stp
->buffer
->map_data
;
548 struct scsi_tape
*STp
= SRpnt
->stp
;
550 req
= blk_get_request(SRpnt
->stp
->device
->request_queue
,
551 data_direction
== DMA_TO_DEVICE
?
552 REQ_OP_SCSI_OUT
: REQ_OP_SCSI_IN
, 0);
554 return DRIVER_ERROR
<< 24;
556 req
->rq_flags
|= RQF_QUIET
;
558 mdata
->null_mapped
= 1;
561 err
= blk_rq_map_user(req
->q
, req
, mdata
, NULL
, bufflen
,
564 blk_put_request(req
);
565 return DRIVER_ERROR
<< 24;
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();
577 STp
->stats
->other_time
= ktime_get();
580 SRpnt
->bio
= req
->bio
;
581 rq
->cmd_len
= COMMAND_SIZE(cmd
[0]);
582 memset(rq
->cmd
, 0, BLK_MAX_CDB
);
583 memcpy(rq
->cmd
, cmd
, rq
->cmd_len
);
584 req
->timeout
= timeout
;
585 rq
->retries
= retries
;
586 req
->end_io_data
= SRpnt
;
588 blk_execute_rq_nowait(req
->q
, NULL
, req
, 1, st_scsi_execute_end
);
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
595 static struct st_request
*
596 st_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
)
599 struct completion
*waiting
;
600 struct rq_map_data
*mdata
= &STp
->buffer
->map_data
;
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
);
610 (STp
->buffer
)->syscall_result
= (-EBUSY
);
615 SRpnt
= st_allocate_request(STp
);
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. */
623 (STp
->buffer
)->last_SRpnt
= SRpnt
;
625 waiting
= &STp
->wait
;
626 init_completion(waiting
);
627 SRpnt
->waiting
= waiting
;
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
;
634 mdata
->page_order
= STp
->buffer
->reserved_page_order
;
636 DIV_ROUND_UP(bytes
, PAGE_SIZE
<< mdata
->page_order
);
637 mdata
->pages
= STp
->buffer
->reserved_pages
;
641 memcpy(SRpnt
->cmd
, cmd
, sizeof(SRpnt
->cmd
));
642 STp
->buffer
->cmdstat
.have_sense
= 0;
643 STp
->buffer
->syscall_result
= 0;
645 ret
= st_scsi_execute(SRpnt
, cmd
, direction
, NULL
, bytes
, timeout
,
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
);
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. */
665 static int write_behind_check(struct scsi_tape
* STp
)
668 struct st_buffer
*STbuffer
;
669 struct st_partstat
*STps
;
670 struct st_cmdstatus
*cmdstatp
;
671 struct st_request
*SRpnt
;
673 STbuffer
= STp
->buffer
;
674 if (!STbuffer
->writing
)
678 if (STp
->write_pending
)
684 wait_for_completion(&(STp
->wait
));
685 SRpnt
= STbuffer
->last_SRpnt
;
686 STbuffer
->last_SRpnt
= NULL
;
687 SRpnt
->waiting
= NULL
;
689 (STp
->buffer
)->syscall_result
= st_chk_result(STp
, SRpnt
);
690 st_release_request(SRpnt
);
692 STbuffer
->buffer_bytes
-= STbuffer
->writing
;
693 STps
= &(STp
->ps
[STp
->partition
]);
694 if (STps
->drv_block
>= 0) {
695 if (STp
->block_size
== 0)
698 STps
->drv_block
+= STbuffer
->writing
/ STp
->block_size
;
701 cmdstatp
= &STbuffer
->cmdstat
;
702 if (STbuffer
->syscall_result
) {
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)
714 STps
->drv_block
= -1;
716 STbuffer
->writing
= 0;
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 */
727 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
728 it messes up the block number). */
729 static int cross_eof(struct scsi_tape
* STp
, int forward
)
731 struct st_request
*SRpnt
;
732 unsigned char cmd
[MAX_COMMAND_SIZE
];
735 cmd
[1] = 0x01; /* Space FileMarks */
740 cmd
[2] = cmd
[3] = cmd
[4] = 0xff; /* -1 filemarks */
743 DEBC_printk(STp
, "Stepping over filemark %s.\n",
744 forward
? "forward" : "backward");
746 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, 0, DMA_NONE
,
747 STp
->device
->request_queue
->rq_timeout
,
750 return (STp
->buffer
)->syscall_result
;
752 st_release_request(SRpnt
);
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");
760 return (STp
->buffer
)->syscall_result
;
764 /* Flush the write buffer (never need to write if variable blocksize). */
765 static int st_flush_write_buffer(struct scsi_tape
* STp
)
769 unsigned char cmd
[MAX_COMMAND_SIZE
];
770 struct st_request
*SRpnt
;
771 struct st_partstat
*STps
;
773 result
= write_behind_check(STp
);
778 if (STp
->dirty
== 1) {
780 transfer
= STp
->buffer
->buffer_bytes
;
781 DEBC_printk(STp
, "Flushing %d bytes.\n", transfer
);
783 memset(cmd
, 0, MAX_COMMAND_SIZE
);
786 blks
= transfer
/ STp
->block_size
;
791 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, transfer
, DMA_TO_DEVICE
,
792 STp
->device
->request_queue
->rq_timeout
,
793 MAX_WRITE_RETRIES
, 1);
795 return (STp
->buffer
)->syscall_result
;
797 STps
= &(STp
->ps
[STp
->partition
]);
798 if ((STp
->buffer
)->syscall_result
!= 0) {
799 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
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 */
808 (STp
->buffer
)->buffer_bytes
= 0;
809 if (STps
->drv_block
>= 0)
810 STps
->drv_block
+= blks
;
813 st_printk(KERN_ERR
, STp
, "Error on flush.\n");
814 STps
->drv_block
= (-1);
818 if (STps
->drv_block
>= 0)
819 STps
->drv_block
+= blks
;
821 (STp
->buffer
)->buffer_bytes
= 0;
823 st_release_request(SRpnt
);
830 /* Flush the tape buffer. The tape will be positioned correctly unless
831 seek_next is true. */
832 static int flush_buffer(struct scsi_tape
*STp
, int seek_next
)
834 int backspace
, result
;
835 struct st_partstat
*STps
;
838 * If there was a bus reset, block further access
841 if (STp
->pos_unknown
)
844 if (STp
->ready
!= ST_READY
)
846 STps
= &(STp
->ps
[STp
->partition
]);
847 if (STps
->rw
== ST_WRITING
) /* Writing */
848 return st_flush_write_buffer(STp
);
850 if (STp
->block_size
== 0)
853 backspace
= ((STp
->buffer
)->buffer_bytes
+
854 (STp
->buffer
)->read_pointer
) / STp
->block_size
-
855 ((STp
->buffer
)->read_pointer
+ STp
->block_size
- 1) /
857 (STp
->buffer
)->buffer_bytes
= 0;
858 (STp
->buffer
)->read_pointer
= 0;
861 if (STps
->eof
== ST_FM_HIT
) {
862 result
= cross_eof(STp
, 0); /* Back over the EOF hit */
864 STps
->eof
= ST_NOEOF
;
866 if (STps
->drv_file
>= 0)
871 if (!result
&& backspace
> 0)
872 result
= st_int_ioctl(STp
, MTBSR
, backspace
);
873 } else if (STps
->eof
== ST_FM_HIT
) {
874 if (STps
->drv_file
>= 0)
877 STps
->eof
= ST_NOEOF
;
883 /* Set the mode parameters */
884 static int set_mode_densblk(struct scsi_tape
* STp
, struct st_modedef
* STm
)
889 if (!STp
->density_changed
&&
890 STm
->default_density
>= 0 &&
891 STm
->default_density
!= STp
->density
) {
892 arg
= STm
->default_density
;
896 arg
<<= MT_ST_DENSITY_SHIFT
;
897 if (!STp
->blksize_changed
&&
898 STm
->default_blksize
>= 0 &&
899 STm
->default_blksize
!= STp
->block_size
) {
900 arg
|= STm
->default_blksize
;
903 arg
|= STp
->block_size
;
905 st_int_ioctl(STp
, SET_DENS_AND_BLK
, arg
)) {
906 st_printk(KERN_WARNING
, STp
,
907 "Can't set default block size to %d bytes "
909 STm
->default_blksize
, STm
->default_density
);
917 /* Lock or unlock the drive door. Don't use when st_request allocated. */
918 static int do_door_lock(struct scsi_tape
* STp
, int do_lock
)
922 DEBC_printk(STp
, "%socking drive door.\n", do_lock
? "L" : "Unl");
924 retval
= scsi_set_medium_removal(STp
->device
,
925 do_lock
? SCSI_REMOVAL_PREVENT
: SCSI_REMOVAL_ALLOW
);
927 STp
->door_locked
= do_lock
? ST_LOCKED_EXPLICIT
: ST_UNLOCKED
;
929 STp
->door_locked
= ST_LOCK_FAILS
;
934 /* Set the internal state after reset */
935 static void reset_state(struct scsi_tape
*STp
)
938 struct st_partstat
*STps
;
940 STp
->pos_unknown
= 0;
941 for (i
= 0; i
< ST_NBR_PARTITIONS
; i
++) {
942 STps
= &(STp
->ps
[i
]);
944 STps
->eof
= ST_NOEOF
;
946 STps
->last_block_valid
= 0;
947 STps
->drv_block
= -1;
950 if (STp
->can_partitions
) {
951 STp
->partition
= find_partition(STp
);
952 if (STp
->partition
< 0)
954 STp
->new_partition
= STp
->partition
;
958 /* Test if the drive is ready. Returns either one of the codes below or a negative system
960 #define CHKRES_READY 0
961 #define CHKRES_NEW_SESSION 1
962 #define CHKRES_NOT_READY 2
963 #define CHKRES_NO_TAPE 3
965 #define MAX_ATTENTIONS 10
967 static int test_ready(struct scsi_tape
*STp
, int do_wait
)
969 int attentions
, waits
, max_wait
, scode
;
970 int retval
= CHKRES_READY
, new_session
= 0;
971 unsigned char cmd
[MAX_COMMAND_SIZE
];
972 struct st_request
*SRpnt
= NULL
;
973 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
975 max_wait
= do_wait
? ST_BLOCK_SECONDS
: 0;
977 for (attentions
=waits
=0; ; ) {
978 memset((void *) &cmd
[0], 0, MAX_COMMAND_SIZE
);
979 cmd
[0] = TEST_UNIT_READY
;
980 SRpnt
= st_do_scsi(SRpnt
, STp
, cmd
, 0, DMA_NONE
,
981 STp
->long_timeout
, MAX_READY_RETRIES
, 1);
984 retval
= (STp
->buffer
)->syscall_result
;
988 if (cmdstatp
->have_sense
) {
990 scode
= cmdstatp
->sense_hdr
.sense_key
;
992 if (scode
== UNIT_ATTENTION
) { /* New media? */
994 if (attentions
< MAX_ATTENTIONS
) {
1004 if (scode
== NOT_READY
) {
1005 if (waits
< max_wait
) {
1006 if (msleep_interruptible(1000)) {
1014 if ((STp
->device
)->scsi_level
>= SCSI_2
&&
1015 cmdstatp
->sense_hdr
.asc
== 0x3a) /* Check ASC */
1016 retval
= CHKRES_NO_TAPE
;
1018 retval
= CHKRES_NOT_READY
;
1024 retval
= (STp
->buffer
)->syscall_result
;
1026 retval
= new_session
? CHKRES_NEW_SESSION
: CHKRES_READY
;
1031 st_release_request(SRpnt
);
1036 /* See if the drive is ready and gather information about the tape. Return values:
1037 < 0 negative error code from errno.h
1039 1 drive not ready (possibly no tape)
1041 static int check_tape(struct scsi_tape
*STp
, struct file
*filp
)
1043 int i
, retval
, new_session
= 0, do_wait
;
1044 unsigned char cmd
[MAX_COMMAND_SIZE
], saved_cleaning
;
1045 unsigned short st_flags
= filp
->f_flags
;
1046 struct st_request
*SRpnt
= NULL
;
1047 struct st_modedef
*STm
;
1048 struct st_partstat
*STps
;
1049 struct inode
*inode
= file_inode(filp
);
1050 int mode
= TAPE_MODE(inode
);
1052 STp
->ready
= ST_READY
;
1054 if (mode
!= STp
->current_mode
) {
1055 DEBC_printk(STp
, "Mode change from %d to %d.\n",
1056 STp
->current_mode
, mode
);
1058 STp
->current_mode
= mode
;
1060 STm
= &(STp
->modes
[STp
->current_mode
]);
1062 saved_cleaning
= STp
->cleaning_req
;
1063 STp
->cleaning_req
= 0;
1065 do_wait
= ((filp
->f_flags
& O_NONBLOCK
) == 0);
1066 retval
= test_ready(STp
, do_wait
);
1071 if (retval
== CHKRES_NEW_SESSION
) {
1072 STp
->pos_unknown
= 0;
1073 STp
->partition
= STp
->new_partition
= 0;
1074 if (STp
->can_partitions
)
1075 STp
->nbr_partitions
= 1; /* This guess will be updated later
1077 for (i
= 0; i
< ST_NBR_PARTITIONS
; i
++) {
1078 STps
= &(STp
->ps
[i
]);
1080 STps
->eof
= ST_NOEOF
;
1082 STps
->last_block_valid
= 0;
1083 STps
->drv_block
= 0;
1089 STp
->cleaning_req
|= saved_cleaning
;
1091 if (retval
== CHKRES_NOT_READY
|| retval
== CHKRES_NO_TAPE
) {
1092 if (retval
== CHKRES_NO_TAPE
)
1093 STp
->ready
= ST_NO_TAPE
;
1095 STp
->ready
= ST_NOT_READY
;
1097 STp
->density
= 0; /* Clear the erroneous "residue" */
1098 STp
->write_prot
= 0;
1099 STp
->block_size
= 0;
1100 STp
->ps
[0].drv_file
= STp
->ps
[0].drv_block
= (-1);
1101 STp
->partition
= STp
->new_partition
= 0;
1102 STp
->door_locked
= ST_UNLOCKED
;
1103 return CHKRES_NOT_READY
;
1107 if (STp
->omit_blklims
)
1108 STp
->min_block
= STp
->max_block
= (-1);
1110 memset((void *) &cmd
[0], 0, MAX_COMMAND_SIZE
);
1111 cmd
[0] = READ_BLOCK_LIMITS
;
1113 SRpnt
= st_do_scsi(SRpnt
, STp
, cmd
, 6, DMA_FROM_DEVICE
,
1114 STp
->device
->request_queue
->rq_timeout
,
1115 MAX_READY_RETRIES
, 1);
1117 retval
= (STp
->buffer
)->syscall_result
;
1121 if (!SRpnt
->result
&& !STp
->buffer
->cmdstat
.have_sense
) {
1122 STp
->max_block
= ((STp
->buffer
)->b_data
[1] << 16) |
1123 ((STp
->buffer
)->b_data
[2] << 8) | (STp
->buffer
)->b_data
[3];
1124 STp
->min_block
= ((STp
->buffer
)->b_data
[4] << 8) |
1125 (STp
->buffer
)->b_data
[5];
1126 if ( DEB( debugging
|| ) !STp
->inited
)
1127 st_printk(KERN_INFO
, STp
,
1128 "Block limits %d - %d bytes.\n",
1129 STp
->min_block
, STp
->max_block
);
1131 STp
->min_block
= STp
->max_block
= (-1);
1132 DEBC_printk(STp
, "Can't read block limits.\n");
1136 memset((void *) &cmd
[0], 0, MAX_COMMAND_SIZE
);
1137 cmd
[0] = MODE_SENSE
;
1140 SRpnt
= st_do_scsi(SRpnt
, STp
, cmd
, 12, DMA_FROM_DEVICE
,
1141 STp
->device
->request_queue
->rq_timeout
,
1142 MAX_READY_RETRIES
, 1);
1144 retval
= (STp
->buffer
)->syscall_result
;
1148 if ((STp
->buffer
)->syscall_result
!= 0) {
1149 DEBC_printk(STp
, "No Mode Sense.\n");
1150 STp
->block_size
= ST_DEFAULT_BLOCK
; /* Educated guess (?) */
1151 (STp
->buffer
)->syscall_result
= 0; /* Prevent error propagation */
1152 STp
->drv_write_prot
= 0;
1154 DEBC_printk(STp
,"Mode sense. Length %d, "
1155 "medium %x, WBS %x, BLL %d\n",
1156 (STp
->buffer
)->b_data
[0],
1157 (STp
->buffer
)->b_data
[1],
1158 (STp
->buffer
)->b_data
[2],
1159 (STp
->buffer
)->b_data
[3]);
1161 if ((STp
->buffer
)->b_data
[3] >= 8) {
1162 STp
->drv_buffer
= ((STp
->buffer
)->b_data
[2] >> 4) & 7;
1163 STp
->density
= (STp
->buffer
)->b_data
[4];
1164 STp
->block_size
= (STp
->buffer
)->b_data
[9] * 65536 +
1165 (STp
->buffer
)->b_data
[10] * 256 + (STp
->buffer
)->b_data
[11];
1166 DEBC_printk(STp
, "Density %x, tape length: %x, "
1169 (STp
->buffer
)->b_data
[5] * 65536 +
1170 (STp
->buffer
)->b_data
[6] * 256 +
1171 (STp
->buffer
)->b_data
[7],
1174 STp
->drv_write_prot
= ((STp
->buffer
)->b_data
[2] & 0x80) != 0;
1175 if (!STp
->drv_buffer
&& STp
->immediate_filemark
) {
1176 st_printk(KERN_WARNING
, STp
,
1177 "non-buffered tape: disabling "
1178 "writing immediate filemarks\n");
1179 STp
->immediate_filemark
= 0;
1182 st_release_request(SRpnt
);
1186 if (STp
->block_size
> 0)
1187 (STp
->buffer
)->buffer_blocks
=
1188 (STp
->buffer
)->buffer_size
/ STp
->block_size
;
1190 (STp
->buffer
)->buffer_blocks
= 1;
1191 (STp
->buffer
)->buffer_bytes
= (STp
->buffer
)->read_pointer
= 0;
1193 DEBC_printk(STp
, "Block size: %d, buffer size: %d (%d blocks).\n",
1194 STp
->block_size
, (STp
->buffer
)->buffer_size
,
1195 (STp
->buffer
)->buffer_blocks
);
1197 if (STp
->drv_write_prot
) {
1198 STp
->write_prot
= 1;
1200 DEBC_printk(STp
, "Write protected\n");
1203 ((st_flags
& O_ACCMODE
) == O_WRONLY
||
1204 (st_flags
& O_ACCMODE
) == O_RDWR
)) {
1210 if (STp
->can_partitions
&& STp
->nbr_partitions
< 1) {
1211 /* This code is reached when the device is opened for the first time
1212 after the driver has been initialized with tape in the drive and the
1213 partition support has been enabled. */
1214 DEBC_printk(STp
, "Updating partition number in status.\n");
1215 if ((STp
->partition
= find_partition(STp
)) < 0) {
1216 retval
= STp
->partition
;
1219 STp
->new_partition
= STp
->partition
;
1220 STp
->nbr_partitions
= 1; /* This guess will be updated when necessary */
1223 if (new_session
) { /* Change the drive parameters for the new mode */
1224 STp
->density_changed
= STp
->blksize_changed
= 0;
1225 STp
->compression_changed
= 0;
1226 if (!(STm
->defaults_for_writes
) &&
1227 (retval
= set_mode_densblk(STp
, STm
)) < 0)
1230 if (STp
->default_drvbuffer
!= 0xff) {
1231 if (st_int_ioctl(STp
, MTSETDRVBUFFER
, STp
->default_drvbuffer
))
1232 st_printk(KERN_WARNING
, STp
,
1233 "Can't set default drive "
1234 "buffering to %d.\n",
1235 STp
->default_drvbuffer
);
1239 return CHKRES_READY
;
1246 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1248 static int st_open(struct inode
*inode
, struct file
*filp
)
1250 int i
, retval
= (-EIO
);
1252 struct scsi_tape
*STp
;
1253 struct st_partstat
*STps
;
1254 int dev
= TAPE_NR(inode
);
1257 * We really want to do nonseekable_open(inode, filp); here, but some
1258 * versions of tar incorrectly call lseek on tapes and bail out if that
1259 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1261 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1263 if (!(STp
= scsi_tape_get(dev
))) {
1267 filp
->private_data
= STp
;
1269 spin_lock(&st_use_lock
);
1271 spin_unlock(&st_use_lock
);
1273 DEBC_printk(STp
, "Device already in use.\n");
1278 spin_unlock(&st_use_lock
);
1279 STp
->rew_at_close
= STp
->autorew_dev
= (iminor(inode
) & 0x80) == 0;
1281 if (scsi_autopm_get_device(STp
->device
) < 0) {
1286 if (!scsi_block_when_processing_errors(STp
->device
)) {
1291 /* See that we have at least a one page buffer available */
1292 if (!enlarge_buffer(STp
->buffer
, PAGE_SIZE
, STp
->restr_dma
)) {
1293 st_printk(KERN_WARNING
, STp
,
1294 "Can't allocate one page tape buffer.\n");
1295 retval
= (-EOVERFLOW
);
1299 (STp
->buffer
)->cleared
= 0;
1300 (STp
->buffer
)->writing
= 0;
1301 (STp
->buffer
)->syscall_result
= 0;
1303 STp
->write_prot
= ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
);
1306 for (i
= 0; i
< ST_NBR_PARTITIONS
; i
++) {
1307 STps
= &(STp
->ps
[i
]);
1310 STp
->try_dio_now
= STp
->try_dio
;
1311 STp
->recover_count
= 0;
1312 DEB( STp
->nbr_waits
= STp
->nbr_finished
= 0;
1313 STp
->nbr_requests
= STp
->nbr_dio
= STp
->nbr_pages
= 0; )
1315 retval
= check_tape(STp
, filp
);
1318 if ((filp
->f_flags
& O_NONBLOCK
) == 0 &&
1319 retval
!= CHKRES_READY
) {
1320 if (STp
->ready
== NO_TAPE
)
1321 retval
= (-ENOMEDIUM
);
1329 normalize_buffer(STp
->buffer
);
1330 spin_lock(&st_use_lock
);
1332 spin_unlock(&st_use_lock
);
1334 scsi_autopm_put_device(STp
->device
);
1341 /* Flush the tape buffer before close */
1342 static int st_flush(struct file
*filp
, fl_owner_t id
)
1344 int result
= 0, result2
;
1345 unsigned char cmd
[MAX_COMMAND_SIZE
];
1346 struct st_request
*SRpnt
;
1347 struct scsi_tape
*STp
= filp
->private_data
;
1348 struct st_modedef
*STm
= &(STp
->modes
[STp
->current_mode
]);
1349 struct st_partstat
*STps
= &(STp
->ps
[STp
->partition
]);
1351 if (file_count(filp
) > 1)
1354 if (STps
->rw
== ST_WRITING
&& !STp
->pos_unknown
) {
1355 result
= st_flush_write_buffer(STp
);
1356 if (result
!= 0 && result
!= (-ENOSPC
))
1360 if (STp
->can_partitions
&&
1361 (result2
= switch_partition(STp
)) < 0) {
1362 DEBC_printk(STp
, "switch_partition at close failed.\n");
1368 DEBC( if (STp
->nbr_requests
)
1369 st_printk(KERN_DEBUG
, STp
,
1370 "Number of r/w requests %d, dio used in %d, "
1371 "pages %d.\n", STp
->nbr_requests
, STp
->nbr_dio
,
1374 if (STps
->rw
== ST_WRITING
&& !STp
->pos_unknown
) {
1375 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
1378 DEBC_printk(STp
, "Async write waits %d, finished %d.\n",
1379 STp
->nbr_waits
, STp
->nbr_finished
);
1381 memset(cmd
, 0, MAX_COMMAND_SIZE
);
1382 cmd
[0] = WRITE_FILEMARKS
;
1383 if (STp
->immediate_filemark
)
1385 cmd
[4] = 1 + STp
->two_fm
;
1387 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, 0, DMA_NONE
,
1388 STp
->device
->request_queue
->rq_timeout
,
1389 MAX_WRITE_RETRIES
, 1);
1391 result
= (STp
->buffer
)->syscall_result
;
1395 if (STp
->buffer
->syscall_result
== 0 ||
1396 (cmdstatp
->have_sense
&& !cmdstatp
->deferred
&&
1397 (cmdstatp
->flags
& SENSE_EOM
) &&
1398 (cmdstatp
->sense_hdr
.sense_key
== NO_SENSE
||
1399 cmdstatp
->sense_hdr
.sense_key
== RECOVERED_ERROR
) &&
1400 (!cmdstatp
->remainder_valid
|| cmdstatp
->uremainder64
== 0))) {
1401 /* Write successful at EOM */
1402 st_release_request(SRpnt
);
1404 if (STps
->drv_file
>= 0)
1406 STps
->drv_block
= 0;
1411 else { /* Write error */
1412 st_release_request(SRpnt
);
1414 st_printk(KERN_ERR
, STp
,
1415 "Error on write filemark.\n");
1420 DEBC_printk(STp
, "Buffer flushed, %d EOF(s) written\n", cmd
[4]);
1421 } else if (!STp
->rew_at_close
) {
1422 STps
= &(STp
->ps
[STp
->partition
]);
1423 if (!STm
->sysv
|| STps
->rw
!= ST_READING
) {
1425 result
= flush_buffer(STp
, 0);
1426 else if (STps
->eof
== ST_FM_HIT
) {
1427 result
= cross_eof(STp
, 0);
1429 if (STps
->drv_file
>= 0)
1431 STps
->drv_block
= 0;
1434 STps
->eof
= ST_NOEOF
;
1436 } else if ((STps
->eof
== ST_NOEOF
&&
1437 !(result
= cross_eof(STp
, 1))) ||
1438 STps
->eof
== ST_FM_HIT
) {
1439 if (STps
->drv_file
>= 0)
1441 STps
->drv_block
= 0;
1447 if (STp
->rew_at_close
) {
1448 result2
= st_int_ioctl(STp
, MTREW
, 1);
1456 /* Close the device and release it. BKL is not needed: this is the only thread
1457 accessing this tape. */
1458 static int st_release(struct inode
*inode
, struct file
*filp
)
1461 struct scsi_tape
*STp
= filp
->private_data
;
1463 if (STp
->door_locked
== ST_LOCKED_AUTO
)
1464 do_door_lock(STp
, 0);
1466 normalize_buffer(STp
->buffer
);
1467 spin_lock(&st_use_lock
);
1469 spin_unlock(&st_use_lock
);
1470 scsi_autopm_put_device(STp
->device
);
1476 /* The checks common to both reading and writing */
1477 static ssize_t
rw_checks(struct scsi_tape
*STp
, struct file
*filp
, size_t count
)
1482 * If we are in the middle of error recovery, don't let anyone
1483 * else try and use this device. Also, if error recovery fails, it
1484 * may try and take the device offline, in which case all further
1485 * access to the device is prohibited.
1487 if (!scsi_block_when_processing_errors(STp
->device
)) {
1492 if (STp
->ready
!= ST_READY
) {
1493 if (STp
->ready
== ST_NO_TAPE
)
1494 retval
= (-ENOMEDIUM
);
1500 if (! STp
->modes
[STp
->current_mode
].defined
) {
1507 * If there was a bus reset, block further access
1510 if (STp
->pos_unknown
) {
1520 st_printk(ST_DEB_MSG
, STp
,
1521 "Incorrect device.\n");
1526 if (STp
->can_partitions
&&
1527 (retval
= switch_partition(STp
)) < 0)
1530 if (STp
->block_size
== 0 && STp
->max_block
> 0 &&
1531 (count
< STp
->min_block
|| count
> STp
->max_block
)) {
1536 if (STp
->do_auto_lock
&& STp
->door_locked
== ST_UNLOCKED
&&
1537 !do_door_lock(STp
, 1))
1538 STp
->door_locked
= ST_LOCKED_AUTO
;
1545 static int setup_buffering(struct scsi_tape
*STp
, const char __user
*buf
,
1546 size_t count
, int is_read
)
1548 int i
, bufsize
, retval
= 0;
1549 struct st_buffer
*STbp
= STp
->buffer
;
1552 i
= STp
->try_dio_now
&& try_rdio
;
1554 i
= STp
->try_dio_now
&& try_wdio
;
1556 if (i
&& ((unsigned long)buf
& queue_dma_alignment(
1557 STp
->device
->request_queue
)) == 0) {
1558 i
= sgl_map_user_pages(STbp
, STbp
->use_sg
, (unsigned long)buf
,
1559 count
, (is_read
? READ
: WRITE
));
1562 STbp
->buffer_bytes
= 0; /* can be used as transfer counter */
1565 STbp
->do_dio
= 0; /* fall back to buffering with any error */
1566 STbp
->sg_segs
= STbp
->do_dio
;
1570 STp
->nbr_pages
+= STbp
->do_dio
;
1575 DEB( STp
->nbr_requests
++; )
1577 if (!STbp
->do_dio
) {
1578 if (STp
->block_size
)
1579 bufsize
= STp
->block_size
> st_fixed_buffer_size
?
1580 STp
->block_size
: st_fixed_buffer_size
;
1583 /* Make sure that data from previous user is not leaked even if
1584 HBA does not return correct residual */
1585 if (is_read
&& STp
->sili
&& !STbp
->cleared
)
1589 if (bufsize
> STbp
->buffer_size
&&
1590 !enlarge_buffer(STbp
, bufsize
, STp
->restr_dma
)) {
1591 st_printk(KERN_WARNING
, STp
,
1592 "Can't allocate %d byte tape buffer.\n",
1594 retval
= (-EOVERFLOW
);
1597 if (STp
->block_size
)
1598 STbp
->buffer_blocks
= bufsize
/ STp
->block_size
;
1606 /* Can be called more than once after each setup_buffer() */
1607 static void release_buffering(struct scsi_tape
*STp
, int is_read
)
1609 struct st_buffer
*STbp
;
1613 sgl_unmap_user_pages(STbp
, STbp
->do_dio
, is_read
);
1622 st_write(struct file
*filp
, const char __user
*buf
, size_t count
, loff_t
* ppos
)
1625 ssize_t i
, do_count
, blks
, transfer
;
1627 int undone
, retry_eot
= 0, scode
;
1629 unsigned char cmd
[MAX_COMMAND_SIZE
];
1630 const char __user
*b_point
;
1631 struct st_request
*SRpnt
= NULL
;
1632 struct scsi_tape
*STp
= filp
->private_data
;
1633 struct st_modedef
*STm
;
1634 struct st_partstat
*STps
;
1635 struct st_buffer
*STbp
;
1637 if (mutex_lock_interruptible(&STp
->lock
))
1638 return -ERESTARTSYS
;
1640 retval
= rw_checks(STp
, filp
, count
);
1641 if (retval
|| count
== 0)
1644 /* Write must be integral number of blocks */
1645 if (STp
->block_size
!= 0 && (count
% STp
->block_size
) != 0) {
1646 st_printk(KERN_WARNING
, STp
,
1647 "Write not multiple of tape block size.\n");
1652 STm
= &(STp
->modes
[STp
->current_mode
]);
1653 STps
= &(STp
->ps
[STp
->partition
]);
1655 if (STp
->write_prot
) {
1661 if (STps
->rw
== ST_READING
) {
1662 retval
= flush_buffer(STp
, 0);
1665 STps
->rw
= ST_WRITING
;
1666 } else if (STps
->rw
!= ST_WRITING
&&
1667 STps
->drv_file
== 0 && STps
->drv_block
== 0) {
1668 if ((retval
= set_mode_densblk(STp
, STm
)) < 0)
1670 if (STm
->default_compression
!= ST_DONT_TOUCH
&&
1671 !(STp
->compression_changed
)) {
1672 if (st_compression(STp
, (STm
->default_compression
== ST_YES
))) {
1673 st_printk(KERN_WARNING
, STp
,
1674 "Can't set default compression.\n");
1675 if (modes_defined
) {
1684 i
= write_behind_check(STp
);
1687 STps
->eof
= ST_EOM_OK
;
1689 STps
->eof
= ST_EOM_ERROR
;
1692 if (STps
->eof
== ST_EOM_OK
) {
1693 STps
->eof
= ST_EOD_1
; /* allow next write */
1697 else if (STps
->eof
== ST_EOM_ERROR
) {
1702 /* Check the buffer readability in cases where copy_user might catch
1703 the problems after some tape movement. */
1704 if (STp
->block_size
!= 0 &&
1706 (copy_from_user(&i
, buf
, 1) != 0 ||
1707 copy_from_user(&i
, buf
+ count
- 1, 1) != 0)) {
1712 retval
= setup_buffering(STp
, buf
, count
, 0);
1718 memset(cmd
, 0, MAX_COMMAND_SIZE
);
1720 cmd
[1] = (STp
->block_size
!= 0);
1722 STps
->rw
= ST_WRITING
;
1725 while (count
> 0 && !retry_eot
) {
1731 if (STp
->block_size
== 0)
1734 do_count
= STbp
->buffer_blocks
* STp
->block_size
-
1736 if (do_count
> count
)
1740 i
= append_to_buffer(b_point
, STbp
, do_count
);
1747 b_point
+= do_count
;
1749 async_write
= STp
->block_size
== 0 && !STbp
->do_dio
&&
1750 STm
->do_async_writes
&& STps
->eof
< ST_EOM_OK
;
1752 if (STp
->block_size
!= 0 && STm
->do_buffer_writes
&&
1753 !(STp
->try_dio_now
&& try_wdio
) && STps
->eof
< ST_EOM_OK
&&
1754 STbp
->buffer_bytes
< STbp
->buffer_size
) {
1756 /* Don't write a buffer that is not full enough. */
1757 if (!async_write
&& count
== 0)
1762 if (STp
->block_size
== 0)
1763 blks
= transfer
= do_count
;
1766 blks
= STbp
->buffer_bytes
;
1769 blks
/= STp
->block_size
;
1770 transfer
= blks
* STp
->block_size
;
1772 cmd
[2] = blks
>> 16;
1776 SRpnt
= st_do_scsi(SRpnt
, STp
, cmd
, transfer
, DMA_TO_DEVICE
,
1777 STp
->device
->request_queue
->rq_timeout
,
1778 MAX_WRITE_RETRIES
, !async_write
);
1780 retval
= STbp
->syscall_result
;
1783 if (async_write
&& !STbp
->syscall_result
) {
1784 STbp
->writing
= transfer
;
1785 STp
->dirty
= !(STbp
->writing
==
1786 STbp
->buffer_bytes
);
1787 SRpnt
= NULL
; /* Prevent releasing this request! */
1788 DEB( STp
->write_pending
= 1; )
1792 if (STbp
->syscall_result
!= 0) {
1793 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
1795 DEBC_printk(STp
, "Error on write:\n");
1796 if (cmdstatp
->have_sense
&& (cmdstatp
->flags
& SENSE_EOM
)) {
1797 scode
= cmdstatp
->sense_hdr
.sense_key
;
1798 if (cmdstatp
->remainder_valid
)
1799 undone
= (int)cmdstatp
->uremainder64
;
1800 else if (STp
->block_size
== 0 &&
1801 scode
== VOLUME_OVERFLOW
)
1805 if (STp
->block_size
!= 0)
1806 undone
*= STp
->block_size
;
1807 if (undone
<= do_count
) {
1808 /* Only data from this write is not written */
1812 if (STp
->block_size
)
1813 blks
= (transfer
- undone
) / STp
->block_size
;
1814 STps
->eof
= ST_EOM_OK
;
1815 /* Continue in fixed block mode if all written
1816 in this request but still something left to write
1817 (retval left to zero)
1819 if (STp
->block_size
== 0 ||
1820 undone
> 0 || count
== 0)
1821 retval
= (-ENOSPC
); /* EOM within current request */
1822 DEBC_printk(STp
, "EOM with %d "
1823 "bytes unwritten.\n",
1826 /* EOT within data buffered earlier (possible only
1827 in fixed block mode without direct i/o) */
1828 if (!retry_eot
&& !cmdstatp
->deferred
&&
1829 (scode
== NO_SENSE
|| scode
== RECOVERED_ERROR
)) {
1830 move_buffer_data(STp
->buffer
, transfer
- undone
);
1832 if (STps
->drv_block
>= 0) {
1833 STps
->drv_block
+= (transfer
- undone
) /
1836 STps
->eof
= ST_EOM_OK
;
1837 DEBC_printk(STp
, "Retry "
1840 STp
->buffer
->buffer_bytes
);
1844 /* Either error within data buffered by driver or
1847 blks
= do_count
= 0;
1848 STps
->eof
= ST_EOM_ERROR
;
1849 STps
->drv_block
= (-1); /* Too cautious? */
1850 retval
= (-EIO
); /* EOM for old data */
1851 DEBC_printk(STp
, "EOM with "
1857 STps
->drv_block
= (-1); /* Too cautious? */
1858 retval
= STbp
->syscall_result
;
1863 if (STps
->drv_block
>= 0) {
1864 if (STp
->block_size
== 0)
1865 STps
->drv_block
+= (do_count
> 0);
1867 STps
->drv_block
+= blks
;
1870 STbp
->buffer_bytes
= 0;
1873 if (retval
|| retry_eot
) {
1875 retval
= total
- count
;
1880 if (STps
->eof
== ST_EOD_1
)
1881 STps
->eof
= ST_EOM_OK
;
1882 else if (STps
->eof
!= ST_EOM_OK
)
1883 STps
->eof
= ST_NOEOF
;
1884 retval
= total
- count
;
1888 st_release_request(SRpnt
);
1889 release_buffering(STp
, 0);
1890 mutex_unlock(&STp
->lock
);
1895 /* Read data from the tape. Returns zero in the normal case, one if the
1896 eof status has changed, and the negative error code in case of a
1897 fatal error. Otherwise updates the buffer and the eof state.
1899 Does release user buffer mapping if it is set.
1901 static long read_tape(struct scsi_tape
*STp
, long count
,
1902 struct st_request
** aSRpnt
)
1904 int transfer
, blks
, bytes
;
1905 unsigned char cmd
[MAX_COMMAND_SIZE
];
1906 struct st_request
*SRpnt
;
1907 struct st_modedef
*STm
;
1908 struct st_partstat
*STps
;
1909 struct st_buffer
*STbp
;
1915 STm
= &(STp
->modes
[STp
->current_mode
]);
1916 STps
= &(STp
->ps
[STp
->partition
]);
1917 if (STps
->eof
== ST_FM_HIT
)
1921 if (STp
->block_size
== 0)
1922 blks
= bytes
= count
;
1924 if (!(STp
->try_dio_now
&& try_rdio
) && STm
->do_read_ahead
) {
1925 blks
= (STp
->buffer
)->buffer_blocks
;
1926 bytes
= blks
* STp
->block_size
;
1929 if (!STbp
->do_dio
&& bytes
> (STp
->buffer
)->buffer_size
)
1930 bytes
= (STp
->buffer
)->buffer_size
;
1931 blks
= bytes
/ STp
->block_size
;
1932 bytes
= blks
* STp
->block_size
;
1936 memset(cmd
, 0, MAX_COMMAND_SIZE
);
1938 cmd
[1] = (STp
->block_size
!= 0);
1939 if (!cmd
[1] && STp
->sili
)
1941 cmd
[2] = blks
>> 16;
1946 SRpnt
= st_do_scsi(SRpnt
, STp
, cmd
, bytes
, DMA_FROM_DEVICE
,
1947 STp
->device
->request_queue
->rq_timeout
,
1949 release_buffering(STp
, 1);
1952 return STbp
->syscall_result
;
1954 STbp
->read_pointer
= 0;
1957 /* Something to check */
1958 if (STbp
->syscall_result
) {
1959 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
1963 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1964 SRpnt
->sense
[0], SRpnt
->sense
[1],
1965 SRpnt
->sense
[2], SRpnt
->sense
[3],
1966 SRpnt
->sense
[4], SRpnt
->sense
[5],
1967 SRpnt
->sense
[6], SRpnt
->sense
[7]);
1968 if (cmdstatp
->have_sense
) {
1970 if (cmdstatp
->sense_hdr
.sense_key
== BLANK_CHECK
)
1971 cmdstatp
->flags
&= 0xcf; /* No need for EOM in this case */
1973 if (cmdstatp
->flags
!= 0) { /* EOF, EOM, or ILI */
1974 /* Compute the residual count */
1975 if (cmdstatp
->remainder_valid
)
1976 transfer
= (int)cmdstatp
->uremainder64
;
1979 if (cmdstatp
->sense_hdr
.sense_key
== MEDIUM_ERROR
) {
1980 if (STp
->block_size
== 0)
1982 /* Some drives set ILI with MEDIUM ERROR */
1983 cmdstatp
->flags
&= ~SENSE_ILI
;
1986 if (cmdstatp
->flags
& SENSE_ILI
) { /* ILI */
1987 if (STp
->block_size
== 0 &&
1989 st_printk(KERN_NOTICE
, STp
,
1990 "Failed to read %d "
1991 "byte block with %d "
1995 if (STps
->drv_block
>= 0)
1996 STps
->drv_block
+= 1;
1997 STbp
->buffer_bytes
= 0;
1999 } else if (STp
->block_size
== 0) {
2000 STbp
->buffer_bytes
= bytes
- transfer
;
2002 st_release_request(SRpnt
);
2003 SRpnt
= *aSRpnt
= NULL
;
2004 if (transfer
== blks
) { /* We did not get anything, error */
2005 st_printk(KERN_NOTICE
, STp
,
2008 if (STps
->drv_block
>= 0)
2009 STps
->drv_block
+= blks
- transfer
+ 1;
2010 st_int_ioctl(STp
, MTBSR
, 1);
2013 /* We have some data, deliver it */
2014 STbp
->buffer_bytes
= (blks
- transfer
) *
2016 DEBC_printk(STp
, "ILI but "
2020 STbp
->buffer_bytes
);
2021 if (STps
->drv_block
>= 0)
2022 STps
->drv_block
+= 1;
2023 if (st_int_ioctl(STp
, MTBSR
, 1))
2026 } else if (cmdstatp
->flags
& SENSE_FMK
) { /* FM overrides EOM */
2027 if (STps
->eof
!= ST_FM_HIT
)
2028 STps
->eof
= ST_FM_HIT
;
2030 STps
->eof
= ST_EOD_2
;
2031 if (STp
->block_size
== 0)
2032 STbp
->buffer_bytes
= 0;
2034 STbp
->buffer_bytes
=
2035 bytes
- transfer
* STp
->block_size
;
2036 DEBC_printk(STp
, "EOF detected (%d "
2038 STbp
->buffer_bytes
);
2039 } else if (cmdstatp
->flags
& SENSE_EOM
) {
2040 if (STps
->eof
== ST_FM
)
2041 STps
->eof
= ST_EOD_1
;
2043 STps
->eof
= ST_EOM_OK
;
2044 if (STp
->block_size
== 0)
2045 STbp
->buffer_bytes
= bytes
- transfer
;
2047 STbp
->buffer_bytes
=
2048 bytes
- transfer
* STp
->block_size
;
2050 DEBC_printk(STp
, "EOM detected (%d "
2052 STbp
->buffer_bytes
);
2055 /* end of EOF, EOM, ILI test */
2056 else { /* nonzero sense key */
2057 DEBC_printk(STp
, "Tape error while reading.\n");
2058 STps
->drv_block
= (-1);
2059 if (STps
->eof
== ST_FM
&&
2060 cmdstatp
->sense_hdr
.sense_key
== BLANK_CHECK
) {
2061 DEBC_printk(STp
, "Zero returned for "
2062 "first BLANK CHECK "
2064 STps
->eof
= ST_EOD_2
; /* First BLANK_CHECK after FM */
2065 } else /* Some other extended sense code */
2069 if (STbp
->buffer_bytes
< 0) /* Caused by bogus sense data */
2070 STbp
->buffer_bytes
= 0;
2072 /* End of extended sense test */
2073 else { /* Non-extended sense */
2074 retval
= STbp
->syscall_result
;
2078 /* End of error handling */
2079 else { /* Read successful */
2080 STbp
->buffer_bytes
= bytes
;
2081 if (STp
->sili
) /* In fixed block mode residual is always zero here */
2082 STbp
->buffer_bytes
-= STp
->buffer
->cmdstat
.residual
;
2085 if (STps
->drv_block
>= 0) {
2086 if (STp
->block_size
== 0)
2089 STps
->drv_block
+= STbp
->buffer_bytes
/ STp
->block_size
;
2097 st_read(struct file
*filp
, char __user
*buf
, size_t count
, loff_t
* ppos
)
2101 ssize_t i
, transfer
;
2102 int special
, do_dio
= 0;
2103 struct st_request
*SRpnt
= NULL
;
2104 struct scsi_tape
*STp
= filp
->private_data
;
2105 struct st_modedef
*STm
;
2106 struct st_partstat
*STps
;
2107 struct st_buffer
*STbp
= STp
->buffer
;
2109 if (mutex_lock_interruptible(&STp
->lock
))
2110 return -ERESTARTSYS
;
2112 retval
= rw_checks(STp
, filp
, count
);
2113 if (retval
|| count
== 0)
2116 STm
= &(STp
->modes
[STp
->current_mode
]);
2117 if (STp
->block_size
!= 0 && (count
% STp
->block_size
) != 0) {
2118 if (!STm
->do_read_ahead
) {
2119 retval
= (-EINVAL
); /* Read must be integral number of blocks */
2122 STp
->try_dio_now
= 0; /* Direct i/o can't handle split blocks */
2125 STps
= &(STp
->ps
[STp
->partition
]);
2126 if (STps
->rw
== ST_WRITING
) {
2127 retval
= flush_buffer(STp
, 0);
2130 STps
->rw
= ST_READING
;
2133 if (debugging
&& STps
->eof
!= ST_NOEOF
)
2134 st_printk(ST_DEB_MSG
, STp
,
2135 "EOF/EOM flag up (%d). Bytes %d\n",
2136 STps
->eof
, STbp
->buffer_bytes
);
2139 retval
= setup_buffering(STp
, buf
, count
, 1);
2142 do_dio
= STbp
->do_dio
;
2144 if (STbp
->buffer_bytes
== 0 &&
2145 STps
->eof
>= ST_EOD_1
) {
2146 if (STps
->eof
< ST_EOD
) {
2151 retval
= (-EIO
); /* EOM or Blank Check */
2156 /* Check the buffer writability before any tape movement. Don't alter
2158 if (copy_from_user(&i
, buf
, 1) != 0 ||
2159 copy_to_user(buf
, &i
, 1) != 0 ||
2160 copy_from_user(&i
, buf
+ count
- 1, 1) != 0 ||
2161 copy_to_user(buf
+ count
- 1, &i
, 1) != 0) {
2167 STps
->rw
= ST_READING
;
2170 /* Loop until enough data in buffer or a special condition found */
2171 for (total
= 0, special
= 0; total
< count
&& !special
;) {
2173 /* Get new data if the buffer is empty */
2174 if (STbp
->buffer_bytes
== 0) {
2175 special
= read_tape(STp
, count
- total
, &SRpnt
);
2176 if (special
< 0) { /* No need to continue read */
2182 /* Move the data from driver buffer to user buffer */
2183 if (STbp
->buffer_bytes
> 0) {
2185 if (debugging
&& STps
->eof
!= ST_NOEOF
)
2186 st_printk(ST_DEB_MSG
, STp
,
2187 "EOF up (%d). Left %d, needed %d.\n",
2188 STps
->eof
, STbp
->buffer_bytes
,
2189 (int)(count
- total
));
2191 transfer
= STbp
->buffer_bytes
< count
- total
?
2192 STbp
->buffer_bytes
: count
- total
;
2194 i
= from_buffer(STbp
, buf
, transfer
);
2204 if (STp
->block_size
== 0)
2205 break; /* Read only one variable length block */
2207 } /* for (total = 0, special = 0;
2208 total < count && !special; ) */
2210 /* Change the eof state if no data from tape or buffer */
2212 if (STps
->eof
== ST_FM_HIT
) {
2214 STps
->drv_block
= 0;
2215 if (STps
->drv_file
>= 0)
2217 } else if (STps
->eof
== ST_EOD_1
) {
2218 STps
->eof
= ST_EOD_2
;
2219 STps
->drv_block
= 0;
2220 if (STps
->drv_file
>= 0)
2222 } else if (STps
->eof
== ST_EOD_2
)
2224 } else if (STps
->eof
== ST_FM
)
2225 STps
->eof
= ST_NOEOF
;
2229 if (SRpnt
!= NULL
) {
2230 st_release_request(SRpnt
);
2234 release_buffering(STp
, 1);
2235 STbp
->buffer_bytes
= 0;
2237 mutex_unlock(&STp
->lock
);
2245 /* Set the driver options */
2246 static void st_log_options(struct scsi_tape
* STp
, struct st_modedef
* STm
)
2249 st_printk(KERN_INFO
, STp
,
2250 "Mode %d options: buffer writes: %d, "
2251 "async writes: %d, read ahead: %d\n",
2252 STp
->current_mode
, STm
->do_buffer_writes
,
2253 STm
->do_async_writes
, STm
->do_read_ahead
);
2254 st_printk(KERN_INFO
, STp
,
2255 " can bsr: %d, two FMs: %d, "
2256 "fast mteom: %d, auto lock: %d,\n",
2257 STp
->can_bsr
, STp
->two_fm
, STp
->fast_mteom
,
2259 st_printk(KERN_INFO
, STp
,
2260 " defs for wr: %d, no block limits: %d, "
2261 "partitions: %d, s2 log: %d\n",
2262 STm
->defaults_for_writes
, STp
->omit_blklims
,
2263 STp
->can_partitions
, STp
->scsi2_logical
);
2264 st_printk(KERN_INFO
, STp
,
2265 " sysv: %d nowait: %d sili: %d "
2266 "nowait_filemark: %d\n",
2267 STm
->sysv
, STp
->immediate
, STp
->sili
,
2268 STp
->immediate_filemark
);
2269 st_printk(KERN_INFO
, STp
, " debugging: %d\n", debugging
);
2275 static int st_set_options(struct scsi_tape
*STp
, long options
)
2279 struct st_modedef
*STm
;
2280 struct cdev
*cd0
, *cd1
;
2281 struct device
*d0
, *d1
;
2283 STm
= &(STp
->modes
[STp
->current_mode
]);
2284 if (!STm
->defined
) {
2285 cd0
= STm
->cdevs
[0];
2286 cd1
= STm
->cdevs
[1];
2289 memcpy(STm
, &(STp
->modes
[0]), sizeof(struct st_modedef
));
2290 STm
->cdevs
[0] = cd0
;
2291 STm
->cdevs
[1] = cd1
;
2295 DEBC_printk(STp
, "Initialized mode %d definition from mode 0\n",
2299 code
= options
& MT_ST_OPTIONS
;
2300 if (code
== MT_ST_BOOLEANS
) {
2301 STm
->do_buffer_writes
= (options
& MT_ST_BUFFER_WRITES
) != 0;
2302 STm
->do_async_writes
= (options
& MT_ST_ASYNC_WRITES
) != 0;
2303 STm
->defaults_for_writes
= (options
& MT_ST_DEF_WRITES
) != 0;
2304 STm
->do_read_ahead
= (options
& MT_ST_READ_AHEAD
) != 0;
2305 STp
->two_fm
= (options
& MT_ST_TWO_FM
) != 0;
2306 STp
->fast_mteom
= (options
& MT_ST_FAST_MTEOM
) != 0;
2307 STp
->do_auto_lock
= (options
& MT_ST_AUTO_LOCK
) != 0;
2308 STp
->can_bsr
= (options
& MT_ST_CAN_BSR
) != 0;
2309 STp
->omit_blklims
= (options
& MT_ST_NO_BLKLIMS
) != 0;
2310 if ((STp
->device
)->scsi_level
>= SCSI_2
)
2311 STp
->can_partitions
= (options
& MT_ST_CAN_PARTITIONS
) != 0;
2312 STp
->scsi2_logical
= (options
& MT_ST_SCSI2LOGICAL
) != 0;
2313 STp
->immediate
= (options
& MT_ST_NOWAIT
) != 0;
2314 STp
->immediate_filemark
= (options
& MT_ST_NOWAIT_EOF
) != 0;
2315 STm
->sysv
= (options
& MT_ST_SYSV
) != 0;
2316 STp
->sili
= (options
& MT_ST_SILI
) != 0;
2317 DEB( debugging
= (options
& MT_ST_DEBUGGING
) != 0;
2318 st_log_options(STp
, STm
); )
2319 } else if (code
== MT_ST_SETBOOLEANS
|| code
== MT_ST_CLEARBOOLEANS
) {
2320 value
= (code
== MT_ST_SETBOOLEANS
);
2321 if ((options
& MT_ST_BUFFER_WRITES
) != 0)
2322 STm
->do_buffer_writes
= value
;
2323 if ((options
& MT_ST_ASYNC_WRITES
) != 0)
2324 STm
->do_async_writes
= value
;
2325 if ((options
& MT_ST_DEF_WRITES
) != 0)
2326 STm
->defaults_for_writes
= value
;
2327 if ((options
& MT_ST_READ_AHEAD
) != 0)
2328 STm
->do_read_ahead
= value
;
2329 if ((options
& MT_ST_TWO_FM
) != 0)
2330 STp
->two_fm
= value
;
2331 if ((options
& MT_ST_FAST_MTEOM
) != 0)
2332 STp
->fast_mteom
= value
;
2333 if ((options
& MT_ST_AUTO_LOCK
) != 0)
2334 STp
->do_auto_lock
= value
;
2335 if ((options
& MT_ST_CAN_BSR
) != 0)
2336 STp
->can_bsr
= value
;
2337 if ((options
& MT_ST_NO_BLKLIMS
) != 0)
2338 STp
->omit_blklims
= value
;
2339 if ((STp
->device
)->scsi_level
>= SCSI_2
&&
2340 (options
& MT_ST_CAN_PARTITIONS
) != 0)
2341 STp
->can_partitions
= value
;
2342 if ((options
& MT_ST_SCSI2LOGICAL
) != 0)
2343 STp
->scsi2_logical
= value
;
2344 if ((options
& MT_ST_NOWAIT
) != 0)
2345 STp
->immediate
= value
;
2346 if ((options
& MT_ST_NOWAIT_EOF
) != 0)
2347 STp
->immediate_filemark
= value
;
2348 if ((options
& MT_ST_SYSV
) != 0)
2350 if ((options
& MT_ST_SILI
) != 0)
2353 if ((options
& MT_ST_DEBUGGING
) != 0)
2355 st_log_options(STp
, STm
); )
2356 } else if (code
== MT_ST_WRITE_THRESHOLD
) {
2357 /* Retained for compatibility */
2358 } else if (code
== MT_ST_DEF_BLKSIZE
) {
2359 value
= (options
& ~MT_ST_OPTIONS
);
2360 if (value
== ~MT_ST_OPTIONS
) {
2361 STm
->default_blksize
= (-1);
2362 DEBC_printk(STp
, "Default block size disabled.\n");
2364 STm
->default_blksize
= value
;
2365 DEBC_printk(STp
,"Default block size set to "
2366 "%d bytes.\n", STm
->default_blksize
);
2367 if (STp
->ready
== ST_READY
) {
2368 STp
->blksize_changed
= 0;
2369 set_mode_densblk(STp
, STm
);
2372 } else if (code
== MT_ST_TIMEOUTS
) {
2373 value
= (options
& ~MT_ST_OPTIONS
);
2374 if ((value
& MT_ST_SET_LONG_TIMEOUT
) != 0) {
2375 STp
->long_timeout
= (value
& ~MT_ST_SET_LONG_TIMEOUT
) * HZ
;
2376 DEBC_printk(STp
, "Long timeout set to %d seconds.\n",
2377 (value
& ~MT_ST_SET_LONG_TIMEOUT
));
2379 blk_queue_rq_timeout(STp
->device
->request_queue
,
2381 DEBC_printk(STp
, "Normal timeout set to %d seconds.\n",
2384 } else if (code
== MT_ST_SET_CLN
) {
2385 value
= (options
& ~MT_ST_OPTIONS
) & 0xff;
2387 (value
< EXTENDED_SENSE_START
||
2388 value
>= SCSI_SENSE_BUFFERSIZE
))
2390 STp
->cln_mode
= value
;
2391 STp
->cln_sense_mask
= (options
>> 8) & 0xff;
2392 STp
->cln_sense_value
= (options
>> 16) & 0xff;
2393 st_printk(KERN_INFO
, STp
,
2394 "Cleaning request mode %d, mask %02x, value %02x\n",
2395 value
, STp
->cln_sense_mask
, STp
->cln_sense_value
);
2396 } else if (code
== MT_ST_DEF_OPTIONS
) {
2397 code
= (options
& ~MT_ST_CLEAR_DEFAULT
);
2398 value
= (options
& MT_ST_CLEAR_DEFAULT
);
2399 if (code
== MT_ST_DEF_DENSITY
) {
2400 if (value
== MT_ST_CLEAR_DEFAULT
) {
2401 STm
->default_density
= (-1);
2403 "Density default disabled.\n");
2405 STm
->default_density
= value
& 0xff;
2406 DEBC_printk(STp
, "Density default set to %x\n",
2407 STm
->default_density
);
2408 if (STp
->ready
== ST_READY
) {
2409 STp
->density_changed
= 0;
2410 set_mode_densblk(STp
, STm
);
2413 } else if (code
== MT_ST_DEF_DRVBUFFER
) {
2414 if (value
== MT_ST_CLEAR_DEFAULT
) {
2415 STp
->default_drvbuffer
= 0xff;
2417 "Drive buffer default disabled.\n");
2419 STp
->default_drvbuffer
= value
& 7;
2421 "Drive buffer default set to %x\n",
2422 STp
->default_drvbuffer
);
2423 if (STp
->ready
== ST_READY
)
2424 st_int_ioctl(STp
, MTSETDRVBUFFER
, STp
->default_drvbuffer
);
2426 } else if (code
== MT_ST_DEF_COMPRESSION
) {
2427 if (value
== MT_ST_CLEAR_DEFAULT
) {
2428 STm
->default_compression
= ST_DONT_TOUCH
;
2430 "Compression default disabled.\n");
2432 if ((value
& 0xff00) != 0) {
2433 STp
->c_algo
= (value
& 0xff00) >> 8;
2434 DEBC_printk(STp
, "Compression "
2435 "algorithm set to 0x%x.\n",
2438 if ((value
& 0xff) != 0xff) {
2439 STm
->default_compression
= (value
& 1 ? ST_YES
: ST_NO
);
2440 DEBC_printk(STp
, "Compression default "
2443 if (STp
->ready
== ST_READY
) {
2444 STp
->compression_changed
= 0;
2445 st_compression(STp
, (STm
->default_compression
== ST_YES
));
2456 #define MODE_HEADER_LENGTH 4
2458 /* Mode header and page byte offsets */
2459 #define MH_OFF_DATA_LENGTH 0
2460 #define MH_OFF_MEDIUM_TYPE 1
2461 #define MH_OFF_DEV_SPECIFIC 2
2462 #define MH_OFF_BDESCS_LENGTH 3
2463 #define MP_OFF_PAGE_NBR 0
2464 #define MP_OFF_PAGE_LENGTH 1
2466 /* Mode header and page bit masks */
2467 #define MH_BIT_WP 0x80
2468 #define MP_MSK_PAGE_NBR 0x3f
2470 /* Don't return block descriptors */
2471 #define MODE_SENSE_OMIT_BDESCS 0x08
2473 #define MODE_SELECT_PAGE_FORMAT 0x10
2475 /* Read a mode page into the tape buffer. The block descriptors are included
2476 if incl_block_descs is true. The page control is ored to the page number
2477 parameter, if necessary. */
2478 static int read_mode_page(struct scsi_tape
*STp
, int page
, int omit_block_descs
)
2480 unsigned char cmd
[MAX_COMMAND_SIZE
];
2481 struct st_request
*SRpnt
;
2483 memset(cmd
, 0, MAX_COMMAND_SIZE
);
2484 cmd
[0] = MODE_SENSE
;
2485 if (omit_block_descs
)
2486 cmd
[1] = MODE_SENSE_OMIT_BDESCS
;
2490 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, cmd
[4], DMA_FROM_DEVICE
,
2491 STp
->device
->request_queue
->rq_timeout
, 0, 1);
2493 return (STp
->buffer
)->syscall_result
;
2495 st_release_request(SRpnt
);
2497 return STp
->buffer
->syscall_result
;
2501 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2502 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2503 static int write_mode_page(struct scsi_tape
*STp
, int page
, int slow
)
2506 unsigned char cmd
[MAX_COMMAND_SIZE
];
2507 struct st_request
*SRpnt
;
2510 memset(cmd
, 0, MAX_COMMAND_SIZE
);
2511 cmd
[0] = MODE_SELECT
;
2512 cmd
[1] = MODE_SELECT_PAGE_FORMAT
;
2513 pgo
= MODE_HEADER_LENGTH
+ (STp
->buffer
)->b_data
[MH_OFF_BDESCS_LENGTH
];
2514 cmd
[4] = pgo
+ (STp
->buffer
)->b_data
[pgo
+ MP_OFF_PAGE_LENGTH
] + 2;
2516 /* Clear reserved fields */
2517 (STp
->buffer
)->b_data
[MH_OFF_DATA_LENGTH
] = 0;
2518 (STp
->buffer
)->b_data
[MH_OFF_MEDIUM_TYPE
] = 0;
2519 (STp
->buffer
)->b_data
[MH_OFF_DEV_SPECIFIC
] &= ~MH_BIT_WP
;
2520 (STp
->buffer
)->b_data
[pgo
+ MP_OFF_PAGE_NBR
] &= MP_MSK_PAGE_NBR
;
2523 STp
->long_timeout
: STp
->device
->request_queue
->rq_timeout
;
2524 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, cmd
[4], DMA_TO_DEVICE
,
2527 return (STp
->buffer
)->syscall_result
;
2529 st_release_request(SRpnt
);
2531 return STp
->buffer
->syscall_result
;
2535 #define COMPRESSION_PAGE 0x0f
2536 #define COMPRESSION_PAGE_LENGTH 16
2538 #define CP_OFF_DCE_DCC 2
2539 #define CP_OFF_C_ALGO 7
2541 #define DCE_MASK 0x80
2542 #define DCC_MASK 0x40
2543 #define RED_MASK 0x60
2546 /* Control the compression with mode page 15. Algorithm not changed if zero.
2548 The block descriptors are read and written because Sony SDT-7000 does not
2549 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2550 Including block descriptors should not cause any harm to other drives. */
2552 static int st_compression(struct scsi_tape
* STp
, int state
)
2555 int mpoffs
; /* Offset to mode page start */
2556 unsigned char *b_data
= (STp
->buffer
)->b_data
;
2558 if (STp
->ready
!= ST_READY
)
2561 /* Read the current page contents */
2562 retval
= read_mode_page(STp
, COMPRESSION_PAGE
, 0);
2564 DEBC_printk(STp
, "Compression mode page not supported.\n");
2568 mpoffs
= MODE_HEADER_LENGTH
+ b_data
[MH_OFF_BDESCS_LENGTH
];
2569 DEBC_printk(STp
, "Compression state is %d.\n",
2570 (b_data
[mpoffs
+ CP_OFF_DCE_DCC
] & DCE_MASK
? 1 : 0));
2572 /* Check if compression can be changed */
2573 if ((b_data
[mpoffs
+ CP_OFF_DCE_DCC
] & DCC_MASK
) == 0) {
2574 DEBC_printk(STp
, "Compression not supported.\n");
2580 b_data
[mpoffs
+ CP_OFF_DCE_DCC
] |= DCE_MASK
;
2581 if (STp
->c_algo
!= 0)
2582 b_data
[mpoffs
+ CP_OFF_C_ALGO
] = STp
->c_algo
;
2585 b_data
[mpoffs
+ CP_OFF_DCE_DCC
] &= ~DCE_MASK
;
2586 if (STp
->c_algo
!= 0)
2587 b_data
[mpoffs
+ CP_OFF_C_ALGO
] = 0; /* no compression */
2590 retval
= write_mode_page(STp
, COMPRESSION_PAGE
, 0);
2592 DEBC_printk(STp
, "Compression change failed.\n");
2595 DEBC_printk(STp
, "Compression state changed to %d.\n", state
);
2597 STp
->compression_changed
= 1;
2602 /* Process the load and unload commands (does unload if the load code is zero) */
2603 static int do_load_unload(struct scsi_tape
*STp
, struct file
*filp
, int load_code
)
2605 int retval
= (-EIO
), timeout
;
2606 unsigned char cmd
[MAX_COMMAND_SIZE
];
2607 struct st_partstat
*STps
;
2608 struct st_request
*SRpnt
;
2610 if (STp
->ready
!= ST_READY
&& !load_code
) {
2611 if (STp
->ready
== ST_NO_TAPE
)
2612 return (-ENOMEDIUM
);
2617 memset(cmd
, 0, MAX_COMMAND_SIZE
);
2618 cmd
[0] = START_STOP
;
2622 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2624 if (load_code
>= 1 + MT_ST_HPLOADER_OFFSET
2625 && load_code
<= 6 + MT_ST_HPLOADER_OFFSET
) {
2626 DEBC_printk(STp
, " Enhanced %sload slot %2d.\n",
2627 (cmd
[4]) ? "" : "un",
2628 load_code
- MT_ST_HPLOADER_OFFSET
);
2629 cmd
[3] = load_code
- MT_ST_HPLOADER_OFFSET
; /* MediaID field of C1553A */
2631 if (STp
->immediate
) {
2632 cmd
[1] = 1; /* Don't wait for completion */
2633 timeout
= STp
->device
->request_queue
->rq_timeout
;
2636 timeout
= STp
->long_timeout
;
2640 st_printk(ST_DEB_MSG
, STp
, "Unloading tape.\n");
2642 st_printk(ST_DEB_MSG
, STp
, "Loading tape.\n");
2645 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, 0, DMA_NONE
,
2646 timeout
, MAX_RETRIES
, 1);
2648 return (STp
->buffer
)->syscall_result
;
2650 retval
= (STp
->buffer
)->syscall_result
;
2651 st_release_request(SRpnt
);
2653 if (!retval
) { /* SCSI command successful */
2656 STp
->rew_at_close
= 0;
2657 STp
->ready
= ST_NO_TAPE
;
2660 STp
->rew_at_close
= STp
->autorew_dev
;
2661 retval
= check_tape(STp
, filp
);
2667 STps
= &(STp
->ps
[STp
->partition
]);
2668 STps
->drv_file
= STps
->drv_block
= (-1);
2675 #define ST_DEB_FORWARD 0
2676 #define ST_DEB_BACKWARD 1
2677 static void deb_space_print(struct scsi_tape
*STp
, int direction
, char *units
, unsigned char *cmd
)
2684 sc
= sign_extend32(get_unaligned_be24(&cmd
[2]), 23);
2687 st_printk(ST_DEB_MSG
, STp
, "Spacing tape %s over %d %s.\n",
2688 direction
? "backward" : "forward", sc
, units
);
2691 #define ST_DEB_FORWARD 0
2692 #define ST_DEB_BACKWARD 1
2693 static void deb_space_print(struct scsi_tape
*STp
, int direction
, char *units
, unsigned char *cmd
) {}
2697 /* Internal ioctl function */
2698 static int st_int_ioctl(struct scsi_tape
*STp
, unsigned int cmd_in
, unsigned long arg
)
2704 unsigned char cmd
[MAX_COMMAND_SIZE
];
2705 struct st_request
*SRpnt
;
2706 struct st_partstat
*STps
;
2707 int fileno
, blkno
, at_sm
, undone
;
2708 int datalen
= 0, direction
= DMA_NONE
;
2710 WARN_ON(STp
->buffer
->do_dio
!= 0);
2711 if (STp
->ready
!= ST_READY
) {
2712 if (STp
->ready
== ST_NO_TAPE
)
2713 return (-ENOMEDIUM
);
2717 timeout
= STp
->long_timeout
;
2718 STps
= &(STp
->ps
[STp
->partition
]);
2719 fileno
= STps
->drv_file
;
2720 blkno
= STps
->drv_block
;
2721 at_sm
= STps
->at_sm
;
2723 memset(cmd
, 0, MAX_COMMAND_SIZE
);
2726 chg_eof
= 0; /* Changed from the FSF after this */
2730 cmd
[1] = 0x01; /* Space FileMarks */
2731 cmd
[2] = (arg
>> 16);
2732 cmd
[3] = (arg
>> 8);
2734 deb_space_print(STp
, ST_DEB_FORWARD
, "filemarks", cmd
);
2738 at_sm
&= (arg
== 0);
2741 chg_eof
= 0; /* Changed from the FSF after this */
2745 cmd
[1] = 0x01; /* Space FileMarks */
2747 cmd
[2] = (ltmp
>> 16);
2748 cmd
[3] = (ltmp
>> 8);
2750 deb_space_print(STp
, ST_DEB_BACKWARD
, "filemarks", cmd
);
2753 blkno
= (-1); /* We can't know the block number */
2754 at_sm
&= (arg
== 0);
2758 cmd
[1] = 0x00; /* Space Blocks */
2759 cmd
[2] = (arg
>> 16);
2760 cmd
[3] = (arg
>> 8);
2762 deb_space_print(STp
, ST_DEB_FORWARD
, "blocks", cmd
);
2765 at_sm
&= (arg
== 0);
2769 cmd
[1] = 0x00; /* Space Blocks */
2771 cmd
[2] = (ltmp
>> 16);
2772 cmd
[3] = (ltmp
>> 8);
2774 deb_space_print(STp
, ST_DEB_BACKWARD
, "blocks", cmd
);
2777 at_sm
&= (arg
== 0);
2781 cmd
[1] = 0x04; /* Space Setmarks */
2782 cmd
[2] = (arg
>> 16);
2783 cmd
[3] = (arg
>> 8);
2785 deb_space_print(STp
, ST_DEB_FORWARD
, "setmarks", cmd
);
2787 blkno
= fileno
= (-1);
2793 cmd
[1] = 0x04; /* Space Setmarks */
2795 cmd
[2] = (ltmp
>> 16);
2796 cmd
[3] = (ltmp
>> 8);
2798 deb_space_print(STp
, ST_DEB_BACKWARD
, "setmarks", cmd
);
2800 blkno
= fileno
= (-1);
2807 if (STp
->write_prot
)
2809 cmd
[0] = WRITE_FILEMARKS
;
2810 if (cmd_in
== MTWSM
)
2812 if (cmd_in
== MTWEOFI
||
2813 (cmd_in
== MTWEOF
&& STp
->immediate_filemark
))
2815 cmd
[2] = (arg
>> 16);
2816 cmd
[3] = (arg
>> 8);
2818 timeout
= STp
->device
->request_queue
->rq_timeout
;
2820 if (cmd_in
!= MTWSM
)
2821 st_printk(ST_DEB_MSG
, STp
,
2822 "Writing %d filemarks.\n",
2827 st_printk(ST_DEB_MSG
, STp
,
2828 "Writing %d setmarks.\n",
2836 at_sm
= (cmd_in
== MTWSM
);
2839 cmd
[0] = REZERO_UNIT
;
2840 if (STp
->immediate
) {
2841 cmd
[1] = 1; /* Don't wait for completion */
2842 timeout
= STp
->device
->request_queue
->rq_timeout
;
2844 DEBC_printk(STp
, "Rewinding tape.\n");
2845 fileno
= blkno
= at_sm
= 0;
2848 DEBC_printk(STp
, "No op on tape.\n");
2849 return 0; /* Should do something ? */
2852 cmd
[0] = START_STOP
;
2853 if (STp
->immediate
) {
2854 cmd
[1] = 1; /* Don't wait for completion */
2855 timeout
= STp
->device
->request_queue
->rq_timeout
;
2858 DEBC_printk(STp
, "Retensioning tape.\n");
2859 fileno
= blkno
= at_sm
= 0;
2862 if (!STp
->fast_mteom
) {
2863 /* space to the end of tape */
2864 ioctl_result
= st_int_ioctl(STp
, MTFSF
, 0x7fffff);
2865 fileno
= STps
->drv_file
;
2866 if (STps
->eof
>= ST_EOD_1
)
2868 /* The next lines would hide the number of spaced FileMarks
2869 That's why I inserted the previous lines. I had no luck
2870 with detecting EOM with FSF, so we go now to EOM.
2876 DEBC_printk(STp
, "Spacing to end of recorded medium.\n");
2881 if (STp
->write_prot
)
2884 cmd
[1] = (arg
? 1 : 0); /* Long erase with non-zero argument */
2885 if (STp
->immediate
) {
2886 cmd
[1] |= 2; /* Don't wait for completion */
2887 timeout
= STp
->device
->request_queue
->rq_timeout
;
2890 timeout
= STp
->long_timeout
* 8;
2892 DEBC_printk(STp
, "Erasing tape.\n");
2893 fileno
= blkno
= at_sm
= 0;
2895 case MTSETBLK
: /* Set block length */
2896 case MTSETDENSITY
: /* Set tape density */
2897 case MTSETDRVBUFFER
: /* Set drive buffering */
2898 case SET_DENS_AND_BLK
: /* Set density and block size */
2900 if (STp
->dirty
|| (STp
->buffer
)->buffer_bytes
!= 0)
2901 return (-EIO
); /* Not allowed if data in buffer */
2902 if ((cmd_in
== MTSETBLK
|| cmd_in
== SET_DENS_AND_BLK
) &&
2903 (arg
& MT_ST_BLKSIZE_MASK
) != 0 &&
2904 STp
->max_block
> 0 &&
2905 ((arg
& MT_ST_BLKSIZE_MASK
) < STp
->min_block
||
2906 (arg
& MT_ST_BLKSIZE_MASK
) > STp
->max_block
)) {
2907 st_printk(KERN_WARNING
, STp
, "Illegal block size.\n");
2910 cmd
[0] = MODE_SELECT
;
2911 if ((STp
->use_pf
& USE_PF
))
2912 cmd
[1] = MODE_SELECT_PAGE_FORMAT
;
2913 cmd
[4] = datalen
= 12;
2914 direction
= DMA_TO_DEVICE
;
2916 memset((STp
->buffer
)->b_data
, 0, 12);
2917 if (cmd_in
== MTSETDRVBUFFER
)
2918 (STp
->buffer
)->b_data
[2] = (arg
& 7) << 4;
2920 (STp
->buffer
)->b_data
[2] =
2921 STp
->drv_buffer
<< 4;
2922 (STp
->buffer
)->b_data
[3] = 8; /* block descriptor length */
2923 if (cmd_in
== MTSETDENSITY
) {
2924 (STp
->buffer
)->b_data
[4] = arg
;
2925 STp
->density_changed
= 1; /* At least we tried ;-) */
2926 } else if (cmd_in
== SET_DENS_AND_BLK
)
2927 (STp
->buffer
)->b_data
[4] = arg
>> 24;
2929 (STp
->buffer
)->b_data
[4] = STp
->density
;
2930 if (cmd_in
== MTSETBLK
|| cmd_in
== SET_DENS_AND_BLK
) {
2931 ltmp
= arg
& MT_ST_BLKSIZE_MASK
;
2932 if (cmd_in
== MTSETBLK
)
2933 STp
->blksize_changed
= 1; /* At least we tried ;-) */
2935 ltmp
= STp
->block_size
;
2936 (STp
->buffer
)->b_data
[9] = (ltmp
>> 16);
2937 (STp
->buffer
)->b_data
[10] = (ltmp
>> 8);
2938 (STp
->buffer
)->b_data
[11] = ltmp
;
2939 timeout
= STp
->device
->request_queue
->rq_timeout
;
2941 if (cmd_in
== MTSETBLK
|| cmd_in
== SET_DENS_AND_BLK
)
2942 st_printk(ST_DEB_MSG
, STp
,
2943 "Setting block size to %d bytes.\n",
2944 (STp
->buffer
)->b_data
[9] * 65536 +
2945 (STp
->buffer
)->b_data
[10] * 256 +
2946 (STp
->buffer
)->b_data
[11]);
2947 if (cmd_in
== MTSETDENSITY
|| cmd_in
== SET_DENS_AND_BLK
)
2948 st_printk(ST_DEB_MSG
, STp
,
2949 "Setting density code to %x.\n",
2950 (STp
->buffer
)->b_data
[4]);
2951 if (cmd_in
== MTSETDRVBUFFER
)
2952 st_printk(ST_DEB_MSG
, STp
,
2953 "Setting drive buffer code to %d.\n",
2954 ((STp
->buffer
)->b_data
[2] >> 4) & 7);
2961 SRpnt
= st_do_scsi(NULL
, STp
, cmd
, datalen
, direction
,
2962 timeout
, MAX_RETRIES
, 1);
2964 return (STp
->buffer
)->syscall_result
;
2966 ioctl_result
= (STp
->buffer
)->syscall_result
;
2968 if (!ioctl_result
) { /* SCSI command successful */
2969 st_release_request(SRpnt
);
2971 STps
->drv_block
= blkno
;
2972 STps
->drv_file
= fileno
;
2973 STps
->at_sm
= at_sm
;
2975 if (cmd_in
== MTBSFM
)
2976 ioctl_result
= st_int_ioctl(STp
, MTFSF
, 1);
2977 else if (cmd_in
== MTFSFM
)
2978 ioctl_result
= st_int_ioctl(STp
, MTBSF
, 1);
2980 if (cmd_in
== MTSETBLK
|| cmd_in
== SET_DENS_AND_BLK
) {
2981 STp
->block_size
= arg
& MT_ST_BLKSIZE_MASK
;
2982 if (STp
->block_size
!= 0) {
2983 (STp
->buffer
)->buffer_blocks
=
2984 (STp
->buffer
)->buffer_size
/ STp
->block_size
;
2986 (STp
->buffer
)->buffer_bytes
= (STp
->buffer
)->read_pointer
= 0;
2987 if (cmd_in
== SET_DENS_AND_BLK
)
2988 STp
->density
= arg
>> MT_ST_DENSITY_SHIFT
;
2989 } else if (cmd_in
== MTSETDRVBUFFER
)
2990 STp
->drv_buffer
= (arg
& 7);
2991 else if (cmd_in
== MTSETDENSITY
)
2994 if (cmd_in
== MTEOM
)
2996 else if (cmd_in
== MTFSF
)
2999 STps
->eof
= ST_NOEOF
;
3001 if (cmd_in
== MTWEOF
|| cmd_in
== MTWEOFI
)
3002 STps
->rw
= ST_IDLE
; /* prevent automatic WEOF at close */
3003 } else { /* SCSI command was not completely successful. Don't return
3004 from this block without releasing the SCSI command block! */
3005 struct st_cmdstatus
*cmdstatp
= &STp
->buffer
->cmdstat
;
3007 if (cmdstatp
->flags
& SENSE_EOM
) {
3008 if (cmd_in
!= MTBSF
&& cmd_in
!= MTBSFM
&&
3009 cmd_in
!= MTBSR
&& cmd_in
!= MTBSS
)
3010 STps
->eof
= ST_EOM_OK
;
3011 STps
->drv_block
= 0;
3014 if (cmdstatp
->remainder_valid
)
3015 undone
= (int)cmdstatp
->uremainder64
;
3019 if ((cmd_in
== MTWEOF
|| cmd_in
== MTWEOFI
) &&
3020 cmdstatp
->have_sense
&&
3021 (cmdstatp
->flags
& SENSE_EOM
)) {
3022 if (cmdstatp
->sense_hdr
.sense_key
== NO_SENSE
||
3023 cmdstatp
->sense_hdr
.sense_key
== RECOVERED_ERROR
) {
3024 ioctl_result
= 0; /* EOF(s) written successfully at EOM */
3025 STps
->eof
= ST_NOEOF
;
3026 } else { /* Writing EOF(s) failed */
3030 STps
->eof
= ST_NOEOF
;
3032 STps
->drv_file
= fileno
;
3033 } else if ((cmd_in
== MTFSF
) || (cmd_in
== MTFSFM
)) {
3035 STps
->drv_file
= fileno
- undone
;
3037 STps
->drv_file
= fileno
;
3038 STps
->drv_block
= -1;
3039 STps
->eof
= ST_NOEOF
;
3040 } else if ((cmd_in
== MTBSF
) || (cmd_in
== MTBSFM
)) {
3041 if (arg
> 0 && undone
< 0) /* Some drives get this wrong */
3043 if (STps
->drv_file
>= 0)
3044 STps
->drv_file
= fileno
+ undone
;
3045 STps
->drv_block
= 0;
3046 STps
->eof
= ST_NOEOF
;
3047 } else if (cmd_in
== MTFSR
) {
3048 if (cmdstatp
->flags
& SENSE_FMK
) { /* Hit filemark */
3049 if (STps
->drv_file
>= 0)
3051 STps
->drv_block
= 0;
3054 if (blkno
>= undone
)
3055 STps
->drv_block
= blkno
- undone
;
3057 STps
->drv_block
= (-1);
3058 STps
->eof
= ST_NOEOF
;
3060 } else if (cmd_in
== MTBSR
) {
3061 if (cmdstatp
->flags
& SENSE_FMK
) { /* Hit filemark */
3063 STps
->drv_block
= (-1);
3065 if (arg
> 0 && undone
< 0) /* Some drives get this wrong */
3067 if (STps
->drv_block
>= 0)
3068 STps
->drv_block
= blkno
+ undone
;
3070 STps
->eof
= ST_NOEOF
;
3071 } else if (cmd_in
== MTEOM
) {
3072 STps
->drv_file
= (-1);
3073 STps
->drv_block
= (-1);
3075 } else if (cmd_in
== MTSETBLK
||
3076 cmd_in
== MTSETDENSITY
||
3077 cmd_in
== MTSETDRVBUFFER
||
3078 cmd_in
== SET_DENS_AND_BLK
) {
3079 if (cmdstatp
->sense_hdr
.sense_key
== ILLEGAL_REQUEST
&&
3080 !(STp
->use_pf
& PF_TESTED
)) {
3081 /* Try the other possible state of Page Format if not
3083 STp
->use_pf
= (STp
->use_pf
^ USE_PF
) | PF_TESTED
;
3084 st_release_request(SRpnt
);
3086 return st_int_ioctl(STp
, cmd_in
, arg
);
3089 STps
->eof
= ST_NOEOF
;
3091 if (cmdstatp
->sense_hdr
.sense_key
== BLANK_CHECK
)
3094 st_release_request(SRpnt
);
3098 return ioctl_result
;
3102 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3105 static int get_location(struct scsi_tape
*STp
, unsigned int *block
, int *partition
,
3109 unsigned char scmd
[MAX_COMMAND_SIZE
];
3110 struct st_request
*SRpnt
;
3112 if (STp
->ready
!= ST_READY
)
3115 memset(scmd
, 0, MAX_COMMAND_SIZE
);
3116 if ((STp
->device
)->scsi_level
< SCSI_2
) {
3117 scmd
[0] = QFA_REQUEST_BLOCK
;
3120 scmd
[0] = READ_POSITION
;
3121 if (!logical
&& !STp
->scsi2_logical
)
3124 SRpnt
= st_do_scsi(NULL
, STp
, scmd
, 20, DMA_FROM_DEVICE
,
3125 STp
->device
->request_queue
->rq_timeout
,
3126 MAX_READY_RETRIES
, 1);
3128 return (STp
->buffer
)->syscall_result
;
3130 if ((STp
->buffer
)->syscall_result
!= 0 ||
3131 (STp
->device
->scsi_level
>= SCSI_2
&&
3132 ((STp
->buffer
)->b_data
[0] & 4) != 0)) {
3133 *block
= *partition
= 0;
3134 DEBC_printk(STp
, " Can't read tape position.\n");
3138 if ((STp
->device
)->scsi_level
< SCSI_2
) {
3139 *block
= ((STp
->buffer
)->b_data
[0] << 16)
3140 + ((STp
->buffer
)->b_data
[1] << 8)
3141 + (STp
->buffer
)->b_data
[2];
3144 *block
= ((STp
->buffer
)->b_data
[4] << 24)
3145 + ((STp
->buffer
)->b_data
[5] << 16)
3146 + ((STp
->buffer
)->b_data
[6] << 8)
3147 + (STp
->buffer
)->b_data
[7];
3148 *partition
= (STp
->buffer
)->b_data
[1];
3149 if (((STp
->buffer
)->b_data
[0] & 0x80) &&
3150 (STp
->buffer
)->b_data
[1] == 0) /* BOP of partition 0 */
3151 STp
->ps
[0].drv_block
= STp
->ps
[0].drv_file
= 0;
3153 DEBC_printk(STp
, "Got tape pos. blk %d part %d.\n",
3154 *block
, *partition
);
3156 st_release_request(SRpnt
);
3163 /* Set the tape block and partition. Negative partition means that only the
3164 block should be set in vendor specific way. */
3165 static int set_location(struct scsi_tape
*STp
, unsigned int block
, int partition
,
3168 struct st_partstat
*STps
;
3172 unsigned char scmd
[MAX_COMMAND_SIZE
];
3173 struct st_request
*SRpnt
;
3175 if (STp
->ready
!= ST_READY
)
3177 timeout
= STp
->long_timeout
;
3178 STps
= &(STp
->ps
[STp
->partition
]);
3180 DEBC_printk(STp
, "Setting block to %d and partition to %d.\n",
3182 DEB(if (partition
< 0)
3185 /* Update the location at the partition we are leaving */
3186 if ((!STp
->can_partitions
&& partition
!= 0) ||
3187 partition
>= ST_NBR_PARTITIONS
)
3189 if (partition
!= STp
->partition
) {
3190 if (get_location(STp
, &blk
, &p
, 1))
3191 STps
->last_block_valid
= 0;
3193 STps
->last_block_valid
= 1;
3194 STps
->last_block_visited
= blk
;
3195 DEBC_printk(STp
, "Visited block %d for "
3196 "partition %d saved.\n",
3197 blk
, STp
->partition
);
3201 memset(scmd
, 0, MAX_COMMAND_SIZE
);
3202 if ((STp
->device
)->scsi_level
< SCSI_2
) {
3203 scmd
[0] = QFA_SEEK_BLOCK
;
3204 scmd
[2] = (block
>> 16);
3205 scmd
[3] = (block
>> 8);
3210 scmd
[3] = (block
>> 24);
3211 scmd
[4] = (block
>> 16);
3212 scmd
[5] = (block
>> 8);
3214 if (!logical
&& !STp
->scsi2_logical
)
3216 if (STp
->partition
!= partition
) {
3218 scmd
[8] = partition
;
3219 DEBC_printk(STp
, "Trying to change partition "
3220 "from %d to %d\n", STp
->partition
,
3224 if (STp
->immediate
) {
3225 scmd
[1] |= 1; /* Don't wait for completion */
3226 timeout
= STp
->device
->request_queue
->rq_timeout
;
3229 SRpnt
= st_do_scsi(NULL
, STp
, scmd
, 0, DMA_NONE
,
3230 timeout
, MAX_READY_RETRIES
, 1);
3232 return (STp
->buffer
)->syscall_result
;
3234 STps
->drv_block
= STps
->drv_file
= (-1);
3235 STps
->eof
= ST_NOEOF
;
3236 if ((STp
->buffer
)->syscall_result
!= 0) {
3238 if (STp
->can_partitions
&&
3239 (STp
->device
)->scsi_level
>= SCSI_2
&&
3240 (p
= find_partition(STp
)) >= 0)
3243 if (STp
->can_partitions
) {
3244 STp
->partition
= partition
;
3245 STps
= &(STp
->ps
[partition
]);
3246 if (!STps
->last_block_valid
||
3247 STps
->last_block_visited
!= block
) {
3254 STps
->drv_block
= STps
->drv_file
= 0;
3258 st_release_request(SRpnt
);
3265 /* Find the current partition number for the drive status. Called from open and
3266 returns either partition number of negative error code. */
3267 static int find_partition(struct scsi_tape
*STp
)
3272 if ((i
= get_location(STp
, &block
, &partition
, 1)) < 0)
3274 if (partition
>= ST_NBR_PARTITIONS
)
3280 /* Change the partition if necessary */
3281 static int switch_partition(struct scsi_tape
*STp
)
3283 struct st_partstat
*STps
;
3285 if (STp
->partition
== STp
->new_partition
)
3287 STps
= &(STp
->ps
[STp
->new_partition
]);
3288 if (!STps
->last_block_valid
)
3289 STps
->last_block_visited
= 0;
3290 return set_location(STp
, STps
->last_block_visited
, STp
->new_partition
, 1);
3293 /* Functions for reading and writing the medium partition mode page. */
3295 #define PART_PAGE 0x11
3296 #define PART_PAGE_FIXED_LENGTH 8
3298 #define PP_OFF_MAX_ADD_PARTS 2
3299 #define PP_OFF_NBR_ADD_PARTS 3
3300 #define PP_OFF_FLAGS 4
3301 #define PP_OFF_PART_UNITS 6
3302 #define PP_OFF_RESERVED 7
3304 #define PP_BIT_IDP 0x20
3305 #define PP_BIT_FDP 0x80
3306 #define PP_MSK_PSUM_MB 0x10
3307 #define PP_MSK_PSUM_UNITS 0x18
3308 #define PP_MSK_POFM 0x04
3310 /* Get the number of partitions on the tape. As a side effect reads the
3311 mode page into the tape buffer. */
3312 static int nbr_partitions(struct scsi_tape
*STp
)
3316 if (STp
->ready
!= ST_READY
)
3319 result
= read_mode_page(STp
, PART_PAGE
, 1);
3322 DEBC_printk(STp
, "Can't read medium partition page.\n");
3325 result
= (STp
->buffer
)->b_data
[MODE_HEADER_LENGTH
+
3326 PP_OFF_NBR_ADD_PARTS
] + 1;
3327 DEBC_printk(STp
, "Number of partitions %d.\n", result
);
3334 static int format_medium(struct scsi_tape
*STp
, int format
)
3337 int timeout
= STp
->long_timeout
;
3338 unsigned char scmd
[MAX_COMMAND_SIZE
];
3339 struct st_request
*SRpnt
;
3341 memset(scmd
, 0, MAX_COMMAND_SIZE
);
3342 scmd
[0] = FORMAT_UNIT
;
3344 if (STp
->immediate
) {
3345 scmd
[1] |= 1; /* Don't wait for completion */
3346 timeout
= STp
->device
->request_queue
->rq_timeout
;
3348 DEBC_printk(STp
, "Sending FORMAT MEDIUM\n");
3349 SRpnt
= st_do_scsi(NULL
, STp
, scmd
, 0, DMA_NONE
,
3350 timeout
, MAX_RETRIES
, 1);
3352 result
= STp
->buffer
->syscall_result
;
3357 /* Partition the tape into two partitions if size > 0 or one partition if
3360 The block descriptors are read and written because Sony SDT-7000 does not
3361 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3363 My HP C1533A drive returns only one partition size field. This is used to
3364 set the size of partition 1. There is no size field for the default partition.
3365 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3366 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3367 The following algorithm is used to accommodate both drives: if the number of
3368 partition size fields is greater than the maximum number of additional partitions
3369 in the mode page, the second field is used. Otherwise the first field is used.
3371 For Seagate DDS drives the page length must be 8 when no partitions is defined
3372 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3373 is acceptable also to some other old drives and enforced if the first partition
3374 size field is used for the first additional partition size.
3376 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3378 static int partition_tape(struct scsi_tape
*STp
, int size
)
3381 int target_partition
;
3382 bool scsi3
= STp
->device
->scsi_level
>= SCSI_3
, needs_format
= false;
3383 int pgo
, psd_cnt
, psdo
;
3384 int psum
= PP_MSK_PSUM_MB
, units
= 0;
3387 result
= read_mode_page(STp
, PART_PAGE
, 0);
3389 DEBC_printk(STp
, "Can't read partition mode page.\n");
3392 target_partition
= 1;
3394 target_partition
= 0;
3398 /* The mode page is in the buffer. Let's modify it and write it. */
3399 bp
= (STp
->buffer
)->b_data
;
3400 pgo
= MODE_HEADER_LENGTH
+ bp
[MH_OFF_BDESCS_LENGTH
];
3401 DEBC_printk(STp
, "Partition page length is %d bytes.\n",
3402 bp
[pgo
+ MP_OFF_PAGE_LENGTH
] + 2);
3404 psd_cnt
= (bp
[pgo
+ MP_OFF_PAGE_LENGTH
] + 2 - PART_PAGE_FIXED_LENGTH
) / 2;
3407 needs_format
= (bp
[pgo
+ PP_OFF_FLAGS
] & PP_MSK_POFM
) != 0;
3408 if (needs_format
&& size
== 0) {
3409 /* No need to write the mode page when clearing
3412 DEBC_printk(STp
, "Formatting tape with one partition.\n");
3413 result
= format_medium(STp
, 0);
3416 if (needs_format
) /* Leave the old value for HP DATs claiming SCSI_3 */
3418 if ((bp
[pgo
+ PP_OFF_FLAGS
] & PP_MSK_PSUM_UNITS
) == PP_MSK_PSUM_UNITS
) {
3419 /* Use units scaling for large partitions if the device
3420 * suggests it and no precision lost. Required for IBM
3421 * TS1140/50 drives that don't support MB units.
3423 if (size
>= 1000 && (size
% 1000) == 0) {
3425 psum
= PP_MSK_PSUM_UNITS
;
3429 /* Try it anyway if too large to specify in MB */
3430 if (psum
== PP_MSK_PSUM_MB
&& size
>= 65534) {
3432 psum
= PP_MSK_PSUM_UNITS
;
3437 if (size
>= 65535 || /* Does not fit into two bytes */
3438 (target_partition
== 0 && psd_cnt
< 2)) {
3443 psdo
= pgo
+ PART_PAGE_FIXED_LENGTH
;
3444 /* The second condition is for HP DDS which use only one partition size
3447 if (target_partition
> 0 &&
3448 (psd_cnt
> bp
[pgo
+ PP_OFF_MAX_ADD_PARTS
] ||
3449 bp
[pgo
+ PP_OFF_MAX_ADD_PARTS
] != 1)) {
3450 bp
[psdo
] = bp
[psdo
+ 1] = 0xff; /* Rest to partition 0 */
3453 memset(bp
+ psdo
, 0, bp
[pgo
+ PP_OFF_NBR_ADD_PARTS
] * 2);
3455 DEBC_printk(STp
, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3456 psd_cnt
, bp
[pgo
+ PP_OFF_MAX_ADD_PARTS
],
3457 bp
[pgo
+ PP_OFF_NBR_ADD_PARTS
]);
3460 bp
[pgo
+ PP_OFF_NBR_ADD_PARTS
] = 0;
3461 if (psd_cnt
<= bp
[pgo
+ PP_OFF_MAX_ADD_PARTS
])
3462 bp
[pgo
+ MP_OFF_PAGE_LENGTH
] = 6;
3463 DEBC_printk(STp
, "Formatting tape with one partition.\n");
3465 bp
[psdo
] = (size
>> 8) & 0xff;
3466 bp
[psdo
+ 1] = size
& 0xff;
3467 if (target_partition
== 0)
3468 bp
[psdo
+ 2] = bp
[psdo
+ 3] = 0xff;
3470 if (bp
[pgo
+ MP_OFF_PAGE_LENGTH
] < 8)
3471 bp
[pgo
+ MP_OFF_PAGE_LENGTH
] = 8;
3473 "Formatting tape with two partitions (%i = %d MB).\n",
3474 target_partition
, units
> 0 ? size
* 1000 : size
);
3476 bp
[pgo
+ PP_OFF_PART_UNITS
] = 0;
3477 bp
[pgo
+ PP_OFF_RESERVED
] = 0;
3478 if (size
!= 1 || units
!= 0) {
3479 bp
[pgo
+ PP_OFF_FLAGS
] = PP_BIT_IDP
| psum
|
3480 (bp
[pgo
+ PP_OFF_FLAGS
] & 0x07);
3481 bp
[pgo
+ PP_OFF_PART_UNITS
] = units
;
3483 bp
[pgo
+ PP_OFF_FLAGS
] = PP_BIT_FDP
|
3484 (bp
[pgo
+ PP_OFF_FLAGS
] & 0x1f);
3485 bp
[pgo
+ MP_OFF_PAGE_LENGTH
] = 6 + psd_cnt
* 2;
3487 result
= write_mode_page(STp
, PART_PAGE
, 1);
3489 if (!result
&& needs_format
)
3490 result
= format_medium(STp
, 1);
3493 st_printk(KERN_INFO
, STp
, "Partitioning of tape failed.\n");
3503 /* The ioctl command */
3504 static long st_ioctl_common(struct file
*file
, unsigned int cmd_in
, void __user
*p
)
3506 int i
, cmd_nr
, cmd_type
, bt
;
3509 struct scsi_tape
*STp
= file
->private_data
;
3510 struct st_modedef
*STm
;
3511 struct st_partstat
*STps
;
3513 if (mutex_lock_interruptible(&STp
->lock
))
3514 return -ERESTARTSYS
;
3517 if (debugging
&& !STp
->in_use
) {
3518 st_printk(ST_DEB_MSG
, STp
, "Incorrect device.\n");
3523 STm
= &(STp
->modes
[STp
->current_mode
]);
3524 STps
= &(STp
->ps
[STp
->partition
]);
3527 * If we are in the middle of error recovery, don't let anyone
3528 * else try and use this device. Also, if error recovery fails, it
3529 * may try and take the device offline, in which case all further
3530 * access to the device is prohibited.
3532 retval
= scsi_ioctl_block_when_processing_errors(STp
->device
, cmd_in
,
3533 file
->f_flags
& O_NDELAY
);
3537 cmd_type
= _IOC_TYPE(cmd_in
);
3538 cmd_nr
= _IOC_NR(cmd_in
);
3540 if (cmd_type
== _IOC_TYPE(MTIOCTOP
) && cmd_nr
== _IOC_NR(MTIOCTOP
)) {
3543 if (_IOC_SIZE(cmd_in
) != sizeof(mtc
)) {
3548 i
= copy_from_user(&mtc
, p
, sizeof(struct mtop
));
3554 if (mtc
.mt_op
== MTSETDRVBUFFER
&& !capable(CAP_SYS_ADMIN
)) {
3555 st_printk(KERN_WARNING
, STp
,
3556 "MTSETDRVBUFFER only allowed for root.\n");
3560 if (!STm
->defined
&&
3561 (mtc
.mt_op
!= MTSETDRVBUFFER
&&
3562 (mtc
.mt_count
& MT_ST_OPTIONS
) == 0)) {
3567 if (!STp
->pos_unknown
) {
3569 if (STps
->eof
== ST_FM_HIT
) {
3570 if (mtc
.mt_op
== MTFSF
|| mtc
.mt_op
== MTFSFM
||
3571 mtc
.mt_op
== MTEOM
) {
3573 if (STps
->drv_file
>= 0)
3574 STps
->drv_file
+= 1;
3575 } else if (mtc
.mt_op
== MTBSF
|| mtc
.mt_op
== MTBSFM
) {
3577 if (STps
->drv_file
>= 0)
3578 STps
->drv_file
+= 1;
3582 if (mtc
.mt_op
== MTSEEK
) {
3583 /* Old position must be restored if partition will be
3585 i
= !STp
->can_partitions
||
3586 (STp
->new_partition
!= STp
->partition
);
3588 i
= mtc
.mt_op
== MTREW
|| mtc
.mt_op
== MTOFFL
||
3589 mtc
.mt_op
== MTRETEN
|| mtc
.mt_op
== MTEOM
||
3590 mtc
.mt_op
== MTLOCK
|| mtc
.mt_op
== MTLOAD
||
3591 mtc
.mt_op
== MTFSF
|| mtc
.mt_op
== MTFSFM
||
3592 mtc
.mt_op
== MTBSF
|| mtc
.mt_op
== MTBSFM
||
3593 mtc
.mt_op
== MTCOMPRESSION
;
3595 i
= flush_buffer(STp
, i
);
3600 if (STps
->rw
== ST_WRITING
&&
3601 (mtc
.mt_op
== MTREW
|| mtc
.mt_op
== MTOFFL
||
3602 mtc
.mt_op
== MTSEEK
||
3603 mtc
.mt_op
== MTBSF
|| mtc
.mt_op
== MTBSFM
)) {
3604 i
= st_int_ioctl(STp
, MTWEOF
, 1);
3609 if (mtc
.mt_op
== MTBSF
|| mtc
.mt_op
== MTBSFM
)
3616 * If there was a bus reset, block further access
3617 * to this device. If the user wants to rewind the tape,
3618 * then reset the flag and allow access again.
3620 if (mtc
.mt_op
!= MTREW
&&
3621 mtc
.mt_op
!= MTOFFL
&&
3622 mtc
.mt_op
!= MTRETEN
&&
3623 mtc
.mt_op
!= MTERASE
&&
3624 mtc
.mt_op
!= MTSEEK
&&
3625 mtc
.mt_op
!= MTEOM
) {
3630 /* remove this when the midlevel properly clears was_reset */
3631 STp
->device
->was_reset
= 0;
3634 if (mtc
.mt_op
!= MTNOP
&& mtc
.mt_op
!= MTSETBLK
&&
3635 mtc
.mt_op
!= MTSETDENSITY
&& mtc
.mt_op
!= MTWSM
&&
3636 mtc
.mt_op
!= MTSETDRVBUFFER
&& mtc
.mt_op
!= MTSETPART
)
3637 STps
->rw
= ST_IDLE
; /* Prevent automatic WEOF and fsf */
3639 if (mtc
.mt_op
== MTOFFL
&& STp
->door_locked
!= ST_UNLOCKED
)
3640 do_door_lock(STp
, 0); /* Ignore result! */
3642 if (mtc
.mt_op
== MTSETDRVBUFFER
&&
3643 (mtc
.mt_count
& MT_ST_OPTIONS
) != 0) {
3644 retval
= st_set_options(STp
, mtc
.mt_count
);
3648 if (mtc
.mt_op
== MTSETPART
) {
3649 if (!STp
->can_partitions
||
3650 mtc
.mt_count
< 0 || mtc
.mt_count
>= ST_NBR_PARTITIONS
) {
3654 if (mtc
.mt_count
>= STp
->nbr_partitions
&&
3655 (STp
->nbr_partitions
= nbr_partitions(STp
)) < 0) {
3659 if (mtc
.mt_count
>= STp
->nbr_partitions
) {
3663 STp
->new_partition
= mtc
.mt_count
;
3668 if (mtc
.mt_op
== MTMKPART
) {
3669 if (!STp
->can_partitions
) {
3673 i
= do_load_unload(STp
, file
, 1);
3678 i
= partition_tape(STp
, mtc
.mt_count
);
3683 for (i
= 0; i
< ST_NBR_PARTITIONS
; i
++) {
3684 STp
->ps
[i
].rw
= ST_IDLE
;
3685 STp
->ps
[i
].at_sm
= 0;
3686 STp
->ps
[i
].last_block_valid
= 0;
3688 STp
->partition
= STp
->new_partition
= 0;
3689 STp
->nbr_partitions
= mtc
.mt_count
!= 0 ? 2 : 1;
3690 STps
->drv_block
= STps
->drv_file
= 0;
3695 if (mtc
.mt_op
== MTSEEK
) {
3696 i
= set_location(STp
, mtc
.mt_count
, STp
->new_partition
, 0);
3697 if (!STp
->can_partitions
)
3698 STp
->ps
[0].rw
= ST_IDLE
;
3703 if (mtc
.mt_op
== MTUNLOAD
|| mtc
.mt_op
== MTOFFL
) {
3704 retval
= do_load_unload(STp
, file
, 0);
3708 if (mtc
.mt_op
== MTLOAD
) {
3709 retval
= do_load_unload(STp
, file
, max(1, mtc
.mt_count
));
3713 if (mtc
.mt_op
== MTLOCK
|| mtc
.mt_op
== MTUNLOCK
) {
3714 retval
= do_door_lock(STp
, (mtc
.mt_op
== MTLOCK
));
3718 if (STp
->can_partitions
&& STp
->ready
== ST_READY
&&
3719 (i
= switch_partition(STp
)) < 0) {
3724 if (mtc
.mt_op
== MTCOMPRESSION
)
3725 retval
= st_compression(STp
, (mtc
.mt_count
& 1));
3727 retval
= st_int_ioctl(STp
, mtc
.mt_op
, mtc
.mt_count
);
3730 if (!STm
->defined
) {
3735 if ((i
= flush_buffer(STp
, 0)) < 0) {
3739 if (STp
->can_partitions
&&
3740 (i
= switch_partition(STp
)) < 0) {
3745 if (cmd_type
== _IOC_TYPE(MTIOCGET
) && cmd_nr
== _IOC_NR(MTIOCGET
)) {
3746 struct mtget mt_status
;
3748 if (_IOC_SIZE(cmd_in
) != sizeof(struct mtget
)) {
3753 mt_status
.mt_type
= STp
->tape_type
;
3754 mt_status
.mt_dsreg
=
3755 ((STp
->block_size
<< MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
) |
3756 ((STp
->density
<< MT_ST_DENSITY_SHIFT
) & MT_ST_DENSITY_MASK
);
3757 mt_status
.mt_blkno
= STps
->drv_block
;
3758 mt_status
.mt_fileno
= STps
->drv_file
;
3759 if (STp
->block_size
!= 0) {
3760 if (STps
->rw
== ST_WRITING
)
3761 mt_status
.mt_blkno
+=
3762 (STp
->buffer
)->buffer_bytes
/ STp
->block_size
;
3763 else if (STps
->rw
== ST_READING
)
3764 mt_status
.mt_blkno
-=
3765 ((STp
->buffer
)->buffer_bytes
+
3766 STp
->block_size
- 1) / STp
->block_size
;
3769 mt_status
.mt_gstat
= 0;
3770 if (STp
->drv_write_prot
)
3771 mt_status
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
3772 if (mt_status
.mt_blkno
== 0) {
3773 if (mt_status
.mt_fileno
== 0)
3774 mt_status
.mt_gstat
|= GMT_BOT(0xffffffff);
3776 mt_status
.mt_gstat
|= GMT_EOF(0xffffffff);
3778 mt_status
.mt_erreg
= (STp
->recover_reg
<< MT_ST_SOFTERR_SHIFT
);
3779 mt_status
.mt_resid
= STp
->partition
;
3780 if (STps
->eof
== ST_EOM_OK
|| STps
->eof
== ST_EOM_ERROR
)
3781 mt_status
.mt_gstat
|= GMT_EOT(0xffffffff);
3782 else if (STps
->eof
>= ST_EOM_OK
)
3783 mt_status
.mt_gstat
|= GMT_EOD(0xffffffff);
3784 if (STp
->density
== 1)
3785 mt_status
.mt_gstat
|= GMT_D_800(0xffffffff);
3786 else if (STp
->density
== 2)
3787 mt_status
.mt_gstat
|= GMT_D_1600(0xffffffff);
3788 else if (STp
->density
== 3)
3789 mt_status
.mt_gstat
|= GMT_D_6250(0xffffffff);
3790 if (STp
->ready
== ST_READY
)
3791 mt_status
.mt_gstat
|= GMT_ONLINE(0xffffffff);
3792 if (STp
->ready
== ST_NO_TAPE
)
3793 mt_status
.mt_gstat
|= GMT_DR_OPEN(0xffffffff);
3795 mt_status
.mt_gstat
|= GMT_SM(0xffffffff);
3796 if (STm
->do_async_writes
||
3797 (STm
->do_buffer_writes
&& STp
->block_size
!= 0) ||
3798 STp
->drv_buffer
!= 0)
3799 mt_status
.mt_gstat
|= GMT_IM_REP_EN(0xffffffff);
3800 if (STp
->cleaning_req
)
3801 mt_status
.mt_gstat
|= GMT_CLN(0xffffffff);
3803 retval
= put_user_mtget(p
, &mt_status
);
3807 STp
->recover_reg
= 0; /* Clear after read */
3809 } /* End of MTIOCGET */
3810 if (cmd_type
== _IOC_TYPE(MTIOCPOS
) && cmd_nr
== _IOC_NR(MTIOCPOS
)) {
3811 struct mtpos mt_pos
;
3812 if (_IOC_SIZE(cmd_in
) != sizeof(struct mtpos
)) {
3816 if ((i
= get_location(STp
, &blk
, &bt
, 0)) < 0) {
3820 mt_pos
.mt_blkno
= blk
;
3821 retval
= put_user_mtpos(p
, &mt_pos
);
3824 mutex_unlock(&STp
->lock
);
3826 case SCSI_IOCTL_STOP_UNIT
:
3828 retval
= scsi_ioctl(STp
->device
, cmd_in
, p
);
3830 STp
->rew_at_close
= 0;
3831 STp
->ready
= ST_NO_TAPE
;
3835 case SCSI_IOCTL_GET_IDLUN
:
3836 case SCSI_IOCTL_GET_BUS_NUMBER
:
3840 if ((cmd_in
== SG_IO
||
3841 cmd_in
== SCSI_IOCTL_SEND_COMMAND
||
3842 cmd_in
== CDROM_SEND_PACKET
) &&
3843 !capable(CAP_SYS_RAWIO
))
3846 i
= scsi_cmd_ioctl(STp
->disk
->queue
, STp
->disk
,
3847 file
->f_mode
, cmd_in
, p
);
3855 mutex_unlock(&STp
->lock
);
3859 static long st_ioctl(struct file
*file
, unsigned int cmd_in
, unsigned long arg
)
3861 void __user
*p
= (void __user
*)arg
;
3862 struct scsi_tape
*STp
= file
->private_data
;
3865 ret
= st_ioctl_common(file
, cmd_in
, p
);
3869 return scsi_ioctl(STp
->device
, cmd_in
, p
);
3872 #ifdef CONFIG_COMPAT
3873 static long st_compat_ioctl(struct file
*file
, unsigned int cmd_in
, unsigned long arg
)
3875 void __user
*p
= compat_ptr(arg
);
3876 struct scsi_tape
*STp
= file
->private_data
;
3879 /* argument conversion is handled using put_user_mtpos/put_user_mtget */
3882 return st_ioctl_common(file
, MTIOCPOS
, p
);
3884 return st_ioctl_common(file
, MTIOCGET
, p
);
3887 ret
= st_ioctl_common(file
, cmd_in
, p
);
3891 return scsi_compat_ioctl(STp
->device
, cmd_in
, p
);
3897 /* Try to allocate a new tape buffer. Calling function must not hold
3899 static struct st_buffer
*new_tape_buffer(int need_dma
, int max_sg
)
3901 struct st_buffer
*tb
;
3903 tb
= kzalloc(sizeof(struct st_buffer
), GFP_KERNEL
);
3905 printk(KERN_NOTICE
"st: Can't allocate new tape buffer.\n");
3909 tb
->use_sg
= max_sg
;
3911 tb
->buffer_size
= 0;
3913 tb
->reserved_pages
= kcalloc(max_sg
, sizeof(struct page
*),
3915 if (!tb
->reserved_pages
) {
3924 /* Try to allocate enough space in the tape buffer */
3925 #define ST_MAX_ORDER 6
3927 static int enlarge_buffer(struct st_buffer
* STbuffer
, int new_size
, int need_dma
)
3929 int segs
, max_segs
, b_size
, order
, got
;
3932 if (new_size
<= STbuffer
->buffer_size
)
3935 if (STbuffer
->buffer_size
<= PAGE_SIZE
)
3936 normalize_buffer(STbuffer
); /* Avoid extra segment */
3938 max_segs
= STbuffer
->use_sg
;
3940 priority
= GFP_KERNEL
| __GFP_NOWARN
;
3942 priority
|= GFP_DMA
;
3944 if (STbuffer
->cleared
)
3945 priority
|= __GFP_ZERO
;
3947 if (STbuffer
->frp_segs
) {
3948 order
= STbuffer
->reserved_page_order
;
3949 b_size
= PAGE_SIZE
<< order
;
3951 for (b_size
= PAGE_SIZE
, order
= 0;
3952 order
< ST_MAX_ORDER
&&
3953 max_segs
* (PAGE_SIZE
<< order
) < new_size
;
3954 order
++, b_size
*= 2)
3956 STbuffer
->reserved_page_order
= order
;
3958 if (max_segs
* (PAGE_SIZE
<< order
) < new_size
) {
3959 if (order
== ST_MAX_ORDER
)
3961 normalize_buffer(STbuffer
);
3962 return enlarge_buffer(STbuffer
, new_size
, need_dma
);
3965 for (segs
= STbuffer
->frp_segs
, got
= STbuffer
->buffer_size
;
3966 segs
< max_segs
&& got
< new_size
;) {
3969 page
= alloc_pages(priority
, order
);
3971 DEB(STbuffer
->buffer_size
= got
);
3972 normalize_buffer(STbuffer
);
3976 STbuffer
->frp_segs
+= 1;
3978 STbuffer
->buffer_size
= got
;
3979 STbuffer
->reserved_pages
[segs
] = page
;
3982 STbuffer
->b_data
= page_address(STbuffer
->reserved_pages
[0]);
3988 /* Make sure that no data from previous user is in the internal buffer */
3989 static void clear_buffer(struct st_buffer
* st_bp
)
3993 for (i
=0; i
< st_bp
->frp_segs
; i
++)
3994 memset(page_address(st_bp
->reserved_pages
[i
]), 0,
3995 PAGE_SIZE
<< st_bp
->reserved_page_order
);
4000 /* Release the extra buffer */
4001 static void normalize_buffer(struct st_buffer
* STbuffer
)
4003 int i
, order
= STbuffer
->reserved_page_order
;
4005 for (i
= 0; i
< STbuffer
->frp_segs
; i
++) {
4006 __free_pages(STbuffer
->reserved_pages
[i
], order
);
4007 STbuffer
->buffer_size
-= (PAGE_SIZE
<< order
);
4009 STbuffer
->frp_segs
= 0;
4010 STbuffer
->sg_segs
= 0;
4011 STbuffer
->reserved_page_order
= 0;
4012 STbuffer
->map_data
.offset
= 0;
4016 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
4017 negative error code. */
4018 static int append_to_buffer(const char __user
*ubp
, struct st_buffer
* st_bp
, int do_count
)
4020 int i
, cnt
, res
, offset
;
4021 int length
= PAGE_SIZE
<< st_bp
->reserved_page_order
;
4023 for (i
= 0, offset
= st_bp
->buffer_bytes
;
4024 i
< st_bp
->frp_segs
&& offset
>= length
; i
++)
4026 if (i
== st_bp
->frp_segs
) { /* Should never happen */
4027 printk(KERN_WARNING
"st: append_to_buffer offset overflow.\n");
4030 for (; i
< st_bp
->frp_segs
&& do_count
> 0; i
++) {
4031 struct page
*page
= st_bp
->reserved_pages
[i
];
4032 cnt
= length
- offset
< do_count
? length
- offset
: do_count
;
4033 res
= copy_from_user(page_address(page
) + offset
, ubp
, cnt
);
4037 st_bp
->buffer_bytes
+= cnt
;
4041 if (do_count
) /* Should never happen */
4048 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4049 negative error code. */
4050 static int from_buffer(struct st_buffer
* st_bp
, char __user
*ubp
, int do_count
)
4052 int i
, cnt
, res
, offset
;
4053 int length
= PAGE_SIZE
<< st_bp
->reserved_page_order
;
4055 for (i
= 0, offset
= st_bp
->read_pointer
;
4056 i
< st_bp
->frp_segs
&& offset
>= length
; i
++)
4058 if (i
== st_bp
->frp_segs
) { /* Should never happen */
4059 printk(KERN_WARNING
"st: from_buffer offset overflow.\n");
4062 for (; i
< st_bp
->frp_segs
&& do_count
> 0; i
++) {
4063 struct page
*page
= st_bp
->reserved_pages
[i
];
4064 cnt
= length
- offset
< do_count
? length
- offset
: do_count
;
4065 res
= copy_to_user(ubp
, page_address(page
) + offset
, cnt
);
4069 st_bp
->buffer_bytes
-= cnt
;
4070 st_bp
->read_pointer
+= cnt
;
4074 if (do_count
) /* Should never happen */
4081 /* Move data towards start of buffer */
4082 static void move_buffer_data(struct st_buffer
* st_bp
, int offset
)
4084 int src_seg
, dst_seg
, src_offset
= 0, dst_offset
;
4086 int length
= PAGE_SIZE
<< st_bp
->reserved_page_order
;
4091 total
=st_bp
->buffer_bytes
- offset
;
4092 for (src_seg
=0; src_seg
< st_bp
->frp_segs
; src_seg
++) {
4093 src_offset
= offset
;
4094 if (src_offset
< length
)
4099 st_bp
->buffer_bytes
= st_bp
->read_pointer
= total
;
4100 for (dst_seg
=dst_offset
=0; total
> 0; ) {
4101 struct page
*dpage
= st_bp
->reserved_pages
[dst_seg
];
4102 struct page
*spage
= st_bp
->reserved_pages
[src_seg
];
4104 count
= min(length
- dst_offset
, length
- src_offset
);
4105 memmove(page_address(dpage
) + dst_offset
,
4106 page_address(spage
) + src_offset
, count
);
4107 src_offset
+= count
;
4108 if (src_offset
>= length
) {
4112 dst_offset
+= count
;
4113 if (dst_offset
>= length
) {
4121 /* Validate the options from command line or module parameters */
4122 static void validate_options(void)
4125 st_fixed_buffer_size
= buffer_kbs
* ST_KILOBYTE
;
4126 if (max_sg_segs
>= ST_FIRST_SG
)
4127 st_max_sg_segs
= max_sg_segs
;
4131 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4133 static int __init
st_setup(char *str
)
4135 int i
, len
, ints
[5];
4138 stp
= get_options(str
, ARRAY_SIZE(ints
), ints
);
4141 for (i
= 0; i
< ints
[0] && i
< ARRAY_SIZE(parms
); i
++)
4143 *parms
[i
].val
= ints
[i
+ 1];
4145 while (stp
!= NULL
) {
4146 for (i
= 0; i
< ARRAY_SIZE(parms
); i
++) {
4147 len
= strlen(parms
[i
].name
);
4148 if (!strncmp(stp
, parms
[i
].name
, len
) &&
4149 (*(stp
+ len
) == ':' || *(stp
+ len
) == '=')) {
4152 simple_strtoul(stp
+ len
+ 1, NULL
, 0);
4154 printk(KERN_WARNING
"st: Obsolete parameter %s\n",
4159 if (i
>= ARRAY_SIZE(parms
))
4160 printk(KERN_WARNING
"st: invalid parameter in '%s'\n",
4162 stp
= strchr(stp
, ',');
4173 __setup("st=", st_setup
);
4177 static const struct file_operations st_fops
=
4179 .owner
= THIS_MODULE
,
4182 .unlocked_ioctl
= st_ioctl
,
4183 #ifdef CONFIG_COMPAT
4184 .compat_ioctl
= st_compat_ioctl
,
4188 .release
= st_release
,
4189 .llseek
= noop_llseek
,
4192 static int create_one_cdev(struct scsi_tape
*tape
, int mode
, int rew
)
4198 struct st_modedef
*STm
= &(tape
->modes
[mode
]);
4200 int dev_num
= tape
->index
;
4202 cdev_devno
= MKDEV(SCSI_TAPE_MAJOR
, TAPE_MINOR(dev_num
, mode
, rew
));
4204 cdev
= cdev_alloc();
4206 pr_err("st%d: out of memory. Device not attached.\n", dev_num
);
4210 cdev
->owner
= THIS_MODULE
;
4211 cdev
->ops
= &st_fops
;
4212 STm
->cdevs
[rew
] = cdev
;
4214 error
= cdev_add(cdev
, cdev_devno
, 1);
4216 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num
,
4217 rew
? "non" : "auto", mode
);
4218 pr_err("st%d: Device not attached.\n", dev_num
);
4222 i
= mode
<< (4 - ST_NBR_MODE_BITS
);
4223 snprintf(name
, 10, "%s%s%s", rew
? "n" : "",
4224 tape
->disk
->disk_name
, st_formats
[i
]);
4226 dev
= device_create(&st_sysfs_class
, &tape
->device
->sdev_gendev
,
4227 cdev_devno
, &tape
->modes
[mode
], "%s", name
);
4229 pr_err("st%d: device_create failed\n", dev_num
);
4230 error
= PTR_ERR(dev
);
4234 STm
->devs
[rew
] = dev
;
4238 cdev_del(STm
->cdevs
[rew
]);
4240 STm
->cdevs
[rew
] = NULL
;
4241 STm
->devs
[rew
] = NULL
;
4245 static int create_cdevs(struct scsi_tape
*tape
)
4248 for (mode
= 0; mode
< ST_NBR_MODES
; ++mode
) {
4249 error
= create_one_cdev(tape
, mode
, 0);
4252 error
= create_one_cdev(tape
, mode
, 1);
4257 return sysfs_create_link(&tape
->device
->sdev_gendev
.kobj
,
4258 &tape
->modes
[0].devs
[0]->kobj
, "tape");
4261 static void remove_cdevs(struct scsi_tape
*tape
)
4264 sysfs_remove_link(&tape
->device
->sdev_gendev
.kobj
, "tape");
4265 for (mode
= 0; mode
< ST_NBR_MODES
; mode
++) {
4266 struct st_modedef
*STm
= &(tape
->modes
[mode
]);
4267 for (rew
= 0; rew
< 2; rew
++) {
4268 if (STm
->cdevs
[rew
])
4269 cdev_del(STm
->cdevs
[rew
]);
4271 device_unregister(STm
->devs
[rew
]);
4276 static int st_probe(struct device
*dev
)
4278 struct scsi_device
*SDp
= to_scsi_device(dev
);
4279 struct gendisk
*disk
= NULL
;
4280 struct scsi_tape
*tpnt
= NULL
;
4281 struct st_modedef
*STm
;
4282 struct st_partstat
*STps
;
4283 struct st_buffer
*buffer
;
4287 if (SDp
->type
!= TYPE_TAPE
)
4289 if ((stp
= st_incompatible(SDp
))) {
4290 sdev_printk(KERN_INFO
, SDp
,
4291 "OnStream tapes are no longer supported;\n");
4292 sdev_printk(KERN_INFO
, SDp
,
4293 "please mail to linux-scsi@vger.kernel.org.\n");
4297 scsi_autopm_get_device(SDp
);
4298 i
= queue_max_segments(SDp
->request_queue
);
4299 if (st_max_sg_segs
< i
)
4301 buffer
= new_tape_buffer((SDp
->host
)->unchecked_isa_dma
, i
);
4302 if (buffer
== NULL
) {
4303 sdev_printk(KERN_ERR
, SDp
,
4304 "st: Can't allocate new tape buffer. "
4305 "Device not attached.\n");
4309 disk
= alloc_disk(1);
4311 sdev_printk(KERN_ERR
, SDp
,
4312 "st: out of memory. Device not attached.\n");
4313 goto out_buffer_free
;
4316 tpnt
= kzalloc(sizeof(struct scsi_tape
), GFP_KERNEL
);
4318 sdev_printk(KERN_ERR
, SDp
,
4319 "st: Can't allocate device descriptor.\n");
4322 kref_init(&tpnt
->kref
);
4324 disk
->private_data
= &tpnt
->driver
;
4325 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4326 * take queue reference that release_disk() expects. */
4327 if (!blk_get_queue(SDp
->request_queue
))
4329 disk
->queue
= SDp
->request_queue
;
4330 tpnt
->driver
= &st_template
;
4333 if (SDp
->scsi_level
<= 2)
4334 tpnt
->tape_type
= MT_ISSCSI1
;
4336 tpnt
->tape_type
= MT_ISSCSI2
;
4338 tpnt
->buffer
= buffer
;
4339 tpnt
->buffer
->last_SRpnt
= NULL
;
4344 tpnt
->drv_buffer
= 1; /* Try buffering if no mode sense */
4345 tpnt
->restr_dma
= (SDp
->host
)->unchecked_isa_dma
;
4346 tpnt
->use_pf
= (SDp
->scsi_level
>= SCSI_2
);
4348 tpnt
->do_auto_lock
= ST_AUTO_LOCK
;
4349 tpnt
->can_bsr
= (SDp
->scsi_level
> 2 ? 1 : ST_IN_FILE_POS
); /* BSR mandatory in SCSI3 */
4350 tpnt
->can_partitions
= 0;
4351 tpnt
->two_fm
= ST_TWO_FM
;
4352 tpnt
->fast_mteom
= ST_FAST_MTEOM
;
4353 tpnt
->scsi2_logical
= ST_SCSI2LOGICAL
;
4354 tpnt
->sili
= ST_SILI
;
4355 tpnt
->immediate
= ST_NOWAIT
;
4356 tpnt
->immediate_filemark
= 0;
4357 tpnt
->default_drvbuffer
= 0xff; /* No forced buffering */
4358 tpnt
->partition
= 0;
4359 tpnt
->new_partition
= 0;
4360 tpnt
->nbr_partitions
= 0;
4361 blk_queue_rq_timeout(tpnt
->device
->request_queue
, ST_TIMEOUT
);
4362 tpnt
->long_timeout
= ST_LONG_TIMEOUT
;
4363 tpnt
->try_dio
= try_direct_io
&& !SDp
->host
->unchecked_isa_dma
;
4365 for (i
= 0; i
< ST_NBR_MODES
; i
++) {
4366 STm
= &(tpnt
->modes
[i
]);
4368 STm
->sysv
= ST_SYSV
;
4369 STm
->defaults_for_writes
= 0;
4370 STm
->do_async_writes
= ST_ASYNC_WRITES
;
4371 STm
->do_buffer_writes
= ST_BUFFER_WRITES
;
4372 STm
->do_read_ahead
= ST_READ_AHEAD
;
4373 STm
->default_compression
= ST_DONT_TOUCH
;
4374 STm
->default_blksize
= (-1); /* No forced size */
4375 STm
->default_density
= (-1); /* No forced density */
4379 for (i
= 0; i
< ST_NBR_PARTITIONS
; i
++) {
4380 STps
= &(tpnt
->ps
[i
]);
4382 STps
->eof
= ST_NOEOF
;
4384 STps
->last_block_valid
= 0;
4385 STps
->drv_block
= (-1);
4386 STps
->drv_file
= (-1);
4389 tpnt
->current_mode
= 0;
4390 tpnt
->modes
[0].defined
= 1;
4392 tpnt
->density_changed
= tpnt
->compression_changed
=
4393 tpnt
->blksize_changed
= 0;
4394 mutex_init(&tpnt
->lock
);
4396 idr_preload(GFP_KERNEL
);
4397 spin_lock(&st_index_lock
);
4398 error
= idr_alloc(&st_index_idr
, tpnt
, 0, ST_MAX_TAPES
+ 1, GFP_NOWAIT
);
4399 spin_unlock(&st_index_lock
);
4402 pr_warn("st: idr allocation failed: %d\n", error
);
4405 tpnt
->index
= error
;
4406 sprintf(disk
->disk_name
, "st%d", tpnt
->index
);
4407 tpnt
->stats
= kzalloc(sizeof(struct scsi_tape_stats
), GFP_KERNEL
);
4408 if (tpnt
->stats
== NULL
) {
4409 sdev_printk(KERN_ERR
, SDp
,
4410 "st: Can't allocate statistics.\n");
4411 goto out_idr_remove
;
4414 dev_set_drvdata(dev
, tpnt
);
4417 error
= create_cdevs(tpnt
);
4419 goto out_remove_devs
;
4420 scsi_autopm_put_device(SDp
);
4422 sdev_printk(KERN_NOTICE
, SDp
,
4423 "Attached scsi tape %s\n", tape_name(tpnt
));
4424 sdev_printk(KERN_INFO
, SDp
, "%s: try direct i/o: %s (alignment %d B)\n",
4425 tape_name(tpnt
), tpnt
->try_dio
? "yes" : "no",
4426 queue_dma_alignment(SDp
->request_queue
) + 1);
4434 spin_lock(&st_index_lock
);
4435 idr_remove(&st_index_idr
, tpnt
->index
);
4436 spin_unlock(&st_index_lock
);
4438 blk_put_queue(disk
->queue
);
4445 scsi_autopm_put_device(SDp
);
4450 static int st_remove(struct device
*dev
)
4452 struct scsi_tape
*tpnt
= dev_get_drvdata(dev
);
4453 int index
= tpnt
->index
;
4455 scsi_autopm_get_device(to_scsi_device(dev
));
4458 mutex_lock(&st_ref_mutex
);
4459 kref_put(&tpnt
->kref
, scsi_tape_release
);
4460 mutex_unlock(&st_ref_mutex
);
4461 spin_lock(&st_index_lock
);
4462 idr_remove(&st_index_idr
, index
);
4463 spin_unlock(&st_index_lock
);
4468 * scsi_tape_release - Called to free the Scsi_Tape structure
4469 * @kref: pointer to embedded kref
4471 * st_ref_mutex must be held entering this routine. Because it is
4472 * called on last put, you should always use the scsi_tape_get()
4473 * scsi_tape_put() helpers which manipulate the semaphore directly
4474 * and never do a direct kref_put().
4476 static void scsi_tape_release(struct kref
*kref
)
4478 struct scsi_tape
*tpnt
= to_scsi_tape(kref
);
4479 struct gendisk
*disk
= tpnt
->disk
;
4481 tpnt
->device
= NULL
;
4484 normalize_buffer(tpnt
->buffer
);
4485 kfree(tpnt
->buffer
->reserved_pages
);
4486 kfree(tpnt
->buffer
);
4489 disk
->private_data
= NULL
;
4496 static struct class st_sysfs_class
= {
4497 .name
= "scsi_tape",
4498 .dev_groups
= st_dev_groups
,
4501 static int __init
init_st(void)
4507 printk(KERN_INFO
"st: Version %s, fixed bufsize %d, s/g segs %d\n",
4508 verstr
, st_fixed_buffer_size
, st_max_sg_segs
);
4510 debugging
= (debug_flag
> 0) ? debug_flag
: NO_DEBUG
;
4512 printk(KERN_INFO
"st: Debugging enabled debug_flag = %d\n",
4516 err
= class_register(&st_sysfs_class
);
4518 pr_err("Unable register sysfs class for SCSI tapes\n");
4522 err
= register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR
, 0),
4523 ST_MAX_TAPE_ENTRIES
, "st");
4525 printk(KERN_ERR
"Unable to get major %d for SCSI tapes\n",
4530 err
= scsi_register_driver(&st_template
.gendrv
);
4537 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR
, 0),
4538 ST_MAX_TAPE_ENTRIES
);
4540 class_unregister(&st_sysfs_class
);
4544 static void __exit
exit_st(void)
4546 scsi_unregister_driver(&st_template
.gendrv
);
4547 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR
, 0),
4548 ST_MAX_TAPE_ENTRIES
);
4549 class_unregister(&st_sysfs_class
);
4550 idr_destroy(&st_index_idr
);
4551 printk(KERN_INFO
"st: Unloaded.\n");
4554 module_init(init_st
);
4555 module_exit(exit_st
);
4558 /* The sysfs driver interface. Read-only at the moment */
4559 static ssize_t
try_direct_io_show(struct device_driver
*ddp
, char *buf
)
4561 return scnprintf(buf
, PAGE_SIZE
, "%d\n", try_direct_io
);
4563 static DRIVER_ATTR_RO(try_direct_io
);
4565 static ssize_t
fixed_buffer_size_show(struct device_driver
*ddp
, char *buf
)
4567 return scnprintf(buf
, PAGE_SIZE
, "%d\n", st_fixed_buffer_size
);
4569 static DRIVER_ATTR_RO(fixed_buffer_size
);
4571 static ssize_t
max_sg_segs_show(struct device_driver
*ddp
, char *buf
)
4573 return scnprintf(buf
, PAGE_SIZE
, "%d\n", st_max_sg_segs
);
4575 static DRIVER_ATTR_RO(max_sg_segs
);
4577 static ssize_t
version_show(struct device_driver
*ddd
, char *buf
)
4579 return scnprintf(buf
, PAGE_SIZE
, "[%s]\n", verstr
);
4581 static DRIVER_ATTR_RO(version
);
4584 static ssize_t
debug_flag_store(struct device_driver
*ddp
,
4585 const char *buf
, size_t count
)
4587 /* We only care what the first byte of the data is the rest is unused.
4588 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4589 * other values have -EINVAL returned if they are passed in.
4592 if (buf
[0] == '0') {
4593 debugging
= NO_DEBUG
;
4595 } else if (buf
[0] == '1') {
4603 static ssize_t
debug_flag_show(struct device_driver
*ddp
, char *buf
)
4605 return scnprintf(buf
, PAGE_SIZE
, "%d\n", debugging
);
4607 static DRIVER_ATTR_RW(debug_flag
);
4610 static struct attribute
*st_drv_attrs
[] = {
4611 &driver_attr_try_direct_io
.attr
,
4612 &driver_attr_fixed_buffer_size
.attr
,
4613 &driver_attr_max_sg_segs
.attr
,
4614 &driver_attr_version
.attr
,
4616 &driver_attr_debug_flag
.attr
,
4620 ATTRIBUTE_GROUPS(st_drv
);
4622 /* The sysfs simple class interface */
4624 defined_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
4626 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4629 l
= snprintf(buf
, PAGE_SIZE
, "%d\n", STm
->defined
);
4632 static DEVICE_ATTR_RO(defined
);
4635 default_blksize_show(struct device
*dev
, struct device_attribute
*attr
,
4638 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4641 l
= snprintf(buf
, PAGE_SIZE
, "%d\n", STm
->default_blksize
);
4644 static DEVICE_ATTR_RO(default_blksize
);
4647 default_density_show(struct device
*dev
, struct device_attribute
*attr
,
4650 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4654 fmt
= STm
->default_density
>= 0 ? "0x%02x\n" : "%d\n";
4655 l
= snprintf(buf
, PAGE_SIZE
, fmt
, STm
->default_density
);
4658 static DEVICE_ATTR_RO(default_density
);
4661 default_compression_show(struct device
*dev
, struct device_attribute
*attr
,
4664 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4667 l
= snprintf(buf
, PAGE_SIZE
, "%d\n", STm
->default_compression
- 1);
4670 static DEVICE_ATTR_RO(default_compression
);
4673 options_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
4675 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4676 struct scsi_tape
*STp
= STm
->tape
;
4680 options
= STm
->do_buffer_writes
? MT_ST_BUFFER_WRITES
: 0;
4681 options
|= STm
->do_async_writes
? MT_ST_ASYNC_WRITES
: 0;
4682 options
|= STm
->do_read_ahead
? MT_ST_READ_AHEAD
: 0;
4683 DEB( options
|= debugging
? MT_ST_DEBUGGING
: 0 );
4684 options
|= STp
->two_fm
? MT_ST_TWO_FM
: 0;
4685 options
|= STp
->fast_mteom
? MT_ST_FAST_MTEOM
: 0;
4686 options
|= STm
->defaults_for_writes
? MT_ST_DEF_WRITES
: 0;
4687 options
|= STp
->can_bsr
? MT_ST_CAN_BSR
: 0;
4688 options
|= STp
->omit_blklims
? MT_ST_NO_BLKLIMS
: 0;
4689 options
|= STp
->can_partitions
? MT_ST_CAN_PARTITIONS
: 0;
4690 options
|= STp
->scsi2_logical
? MT_ST_SCSI2LOGICAL
: 0;
4691 options
|= STm
->sysv
? MT_ST_SYSV
: 0;
4692 options
|= STp
->immediate
? MT_ST_NOWAIT
: 0;
4693 options
|= STp
->immediate_filemark
? MT_ST_NOWAIT_EOF
: 0;
4694 options
|= STp
->sili
? MT_ST_SILI
: 0;
4696 l
= snprintf(buf
, PAGE_SIZE
, "0x%08x\n", options
);
4699 static DEVICE_ATTR_RO(options
);
4701 /* Support for tape stats */
4704 * read_cnt_show - return read count - count of reads made from tape drive
4705 * @dev: struct device
4706 * @attr: attribute structure
4707 * @buf: buffer to return formatted data in
4709 static ssize_t
read_cnt_show(struct device
*dev
,
4710 struct device_attribute
*attr
, char *buf
)
4712 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4714 return sprintf(buf
, "%lld",
4715 (long long)atomic64_read(&STm
->tape
->stats
->read_cnt
));
4717 static DEVICE_ATTR_RO(read_cnt
);
4720 * read_byte_cnt_show - return read byte count - tape drives
4721 * may use blocks less than 512 bytes this gives the raw byte count of
4722 * of data read from the tape drive.
4723 * @dev: struct device
4724 * @attr: attribute structure
4725 * @buf: buffer to return formatted data in
4727 static ssize_t
read_byte_cnt_show(struct device
*dev
,
4728 struct device_attribute
*attr
, char *buf
)
4730 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4732 return sprintf(buf
, "%lld",
4733 (long long)atomic64_read(&STm
->tape
->stats
->read_byte_cnt
));
4735 static DEVICE_ATTR_RO(read_byte_cnt
);
4738 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4739 * @dev: struct device
4740 * @attr: attribute structure
4741 * @buf: buffer to return formatted data in
4743 static ssize_t
read_ns_show(struct device
*dev
,
4744 struct device_attribute
*attr
, char *buf
)
4746 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4748 return sprintf(buf
, "%lld",
4749 (long long)atomic64_read(&STm
->tape
->stats
->tot_read_time
));
4751 static DEVICE_ATTR_RO(read_ns
);
4754 * write_cnt_show - write count - number of user calls
4755 * to write(2) that have written data to tape.
4756 * @dev: struct device
4757 * @attr: attribute structure
4758 * @buf: buffer to return formatted data in
4760 static ssize_t
write_cnt_show(struct device
*dev
,
4761 struct device_attribute
*attr
, char *buf
)
4763 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4765 return sprintf(buf
, "%lld",
4766 (long long)atomic64_read(&STm
->tape
->stats
->write_cnt
));
4768 static DEVICE_ATTR_RO(write_cnt
);
4771 * write_byte_cnt_show - write byte count - raw count of
4772 * bytes written to tape.
4773 * @dev: struct device
4774 * @attr: attribute structure
4775 * @buf: buffer to return formatted data in
4777 static ssize_t
write_byte_cnt_show(struct device
*dev
,
4778 struct device_attribute
*attr
, char *buf
)
4780 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4782 return sprintf(buf
, "%lld",
4783 (long long)atomic64_read(&STm
->tape
->stats
->write_byte_cnt
));
4785 static DEVICE_ATTR_RO(write_byte_cnt
);
4788 * write_ns_show - write ns - number of nanoseconds waiting on write
4789 * requests to complete.
4790 * @dev: struct device
4791 * @attr: attribute structure
4792 * @buf: buffer to return formatted data in
4794 static ssize_t
write_ns_show(struct device
*dev
,
4795 struct device_attribute
*attr
, char *buf
)
4797 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4799 return sprintf(buf
, "%lld",
4800 (long long)atomic64_read(&STm
->tape
->stats
->tot_write_time
));
4802 static DEVICE_ATTR_RO(write_ns
);
4805 * in_flight_show - number of I/Os currently in flight -
4806 * in most cases this will be either 0 or 1. It may be higher if someone
4807 * has also issued other SCSI commands such as via an ioctl.
4808 * @dev: struct device
4809 * @attr: attribute structure
4810 * @buf: buffer to return formatted data in
4812 static ssize_t
in_flight_show(struct device
*dev
,
4813 struct device_attribute
*attr
, char *buf
)
4815 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4817 return sprintf(buf
, "%lld",
4818 (long long)atomic64_read(&STm
->tape
->stats
->in_flight
));
4820 static DEVICE_ATTR_RO(in_flight
);
4823 * io_ns_show - io wait ns - this is the number of ns spent
4824 * waiting on all I/O to complete. This includes tape movement commands
4825 * such as rewinding, seeking to end of file or tape, it also includes
4826 * read and write. To determine the time spent on tape movement
4827 * subtract the read and write ns from this value.
4828 * @dev: struct device
4829 * @attr: attribute structure
4830 * @buf: buffer to return formatted data in
4832 static ssize_t
io_ns_show(struct device
*dev
,
4833 struct device_attribute
*attr
, char *buf
)
4835 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4837 return sprintf(buf
, "%lld",
4838 (long long)atomic64_read(&STm
->tape
->stats
->tot_io_time
));
4840 static DEVICE_ATTR_RO(io_ns
);
4843 * other_cnt_show - other io count - this is the number of
4844 * I/O requests other than read and write requests.
4845 * Typically these are tape movement requests but will include driver
4846 * tape movement. This includes only requests issued by the st driver.
4847 * @dev: struct device
4848 * @attr: attribute structure
4849 * @buf: buffer to return formatted data in
4851 static ssize_t
other_cnt_show(struct device
*dev
,
4852 struct device_attribute
*attr
, char *buf
)
4854 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4856 return sprintf(buf
, "%lld",
4857 (long long)atomic64_read(&STm
->tape
->stats
->other_cnt
));
4859 static DEVICE_ATTR_RO(other_cnt
);
4862 * resid_cnt_show - A count of the number of times we get a residual
4863 * count - this should indicate someone issuing reads larger than the
4864 * block size on tape.
4865 * @dev: struct device
4866 * @attr: attribute structure
4867 * @buf: buffer to return formatted data in
4869 static ssize_t
resid_cnt_show(struct device
*dev
,
4870 struct device_attribute
*attr
, char *buf
)
4872 struct st_modedef
*STm
= dev_get_drvdata(dev
);
4874 return sprintf(buf
, "%lld",
4875 (long long)atomic64_read(&STm
->tape
->stats
->resid_cnt
));
4877 static DEVICE_ATTR_RO(resid_cnt
);
4879 static struct attribute
*st_dev_attrs
[] = {
4880 &dev_attr_defined
.attr
,
4881 &dev_attr_default_blksize
.attr
,
4882 &dev_attr_default_density
.attr
,
4883 &dev_attr_default_compression
.attr
,
4884 &dev_attr_options
.attr
,
4888 static struct attribute
*st_stats_attrs
[] = {
4889 &dev_attr_read_cnt
.attr
,
4890 &dev_attr_read_byte_cnt
.attr
,
4891 &dev_attr_read_ns
.attr
,
4892 &dev_attr_write_cnt
.attr
,
4893 &dev_attr_write_byte_cnt
.attr
,
4894 &dev_attr_write_ns
.attr
,
4895 &dev_attr_in_flight
.attr
,
4896 &dev_attr_io_ns
.attr
,
4897 &dev_attr_other_cnt
.attr
,
4898 &dev_attr_resid_cnt
.attr
,
4902 static struct attribute_group stats_group
= {
4904 .attrs
= st_stats_attrs
,
4907 static struct attribute_group st_group
= {
4908 .attrs
= st_dev_attrs
,
4911 static const struct attribute_group
*st_dev_groups
[] = {
4917 /* The following functions may be useful for a larger audience. */
4918 static int sgl_map_user_pages(struct st_buffer
*STbp
,
4919 const unsigned int max_pages
, unsigned long uaddr
,
4920 size_t count
, int rw
)
4922 unsigned long end
= (uaddr
+ count
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
4923 unsigned long start
= uaddr
>> PAGE_SHIFT
;
4924 const int nr_pages
= end
- start
;
4926 struct page
**pages
;
4927 struct rq_map_data
*mdata
= &STbp
->map_data
;
4929 /* User attempted Overflow! */
4930 if ((uaddr
+ count
) < uaddr
)
4934 if (nr_pages
> max_pages
)
4941 pages
= kmalloc_array(max_pages
, sizeof(*pages
), GFP_KERNEL
);
4945 /* Try to fault in all of the necessary pages */
4946 /* rw==READ means read from drive, write into memory area */
4947 res
= get_user_pages_fast(uaddr
, nr_pages
, rw
== READ
? FOLL_WRITE
: 0,
4950 /* Errors and no page mapped should return here */
4954 for (i
=0; i
< nr_pages
; i
++) {
4955 /* FIXME: flush superflous for rw==READ,
4956 * probably wrong function for rw==WRITE
4958 flush_dcache_page(pages
[i
]);
4961 mdata
->offset
= uaddr
& ~PAGE_MASK
;
4962 STbp
->mapped_pages
= pages
;
4967 for (j
=0; j
< res
; j
++)
4976 /* And unmap them... */
4977 static int sgl_unmap_user_pages(struct st_buffer
*STbp
,
4978 const unsigned int nr_pages
, int dirtied
)
4982 for (i
=0; i
< nr_pages
; i
++) {
4983 struct page
*page
= STbp
->mapped_pages
[i
];
4987 /* FIXME: cache flush missing for rw==READ
4988 * FIXME: call the correct reference counting function
4992 kfree(STbp
->mapped_pages
);
4993 STbp
->mapped_pages
= NULL
;