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.txt 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>
26 #include <linux/kernel.h>
27 #include <linux/sched/signal.h>
29 #include <linux/init.h>
30 #include <linux/string.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/mtio.h>
34 #include <linux/cdrom.h>
35 #include <linux/ioctl.h>
36 #include <linux/fcntl.h>
37 #include <linux/spinlock.h>
38 #include <linux/blkdev.h>
39 #include <linux/moduleparam.h>
40 #include <linux/cdev.h>
41 #include <linux/idr.h>
42 #include <linux/delay.h>
43 #include <linux/mutex.h>
45 #include <linux/uaccess.h>
48 #include <scsi/scsi.h>
49 #include <scsi/scsi_dbg.h>
50 #include <scsi/scsi_device.h>
51 #include <scsi/scsi_driver.h>
52 #include <scsi/scsi_eh.h>
53 #include <scsi/scsi_host.h>
54 #include <scsi/scsi_ioctl.h>
58 /* The driver prints some debugging information on the console if DEBUG
59 is defined and non-zero. */
63 #define ST_DEB_MSG KERN_NOTICE
65 /* The message level for the debug messages is currently set to KERN_NOTICE
66 so that people can easily see the messages. Later when the debugging messages
67 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
69 #define DEBC(a) if (debugging) { a ; }
75 #define ST_KILOBYTE 1024
77 #include "st_options.h"
80 static int buffer_kbs;
81 static int max_sg_segs;
82 static int try_direct_io = TRY_DIRECT_IO;
83 static int try_rdio = 1;
84 static int try_wdio = 1;
85 static int debug_flag;
87 static struct class st_sysfs_class;
88 static const struct attribute_group *st_dev_groups[];
89 static const struct attribute_group *st_drv_groups[];
91 MODULE_AUTHOR("Kai Makisara");
92 MODULE_DESCRIPTION("SCSI tape (st) driver");
93 MODULE_LICENSE("GPL");
94 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
95 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
97 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
98 * of sysfs parameters (which module_param doesn't yet support).
99 * Sysfs parameters defined explicitly later.
101 module_param_named(buffer_kbs, buffer_kbs, int, 0);
102 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
103 module_param_named(max_sg_segs, max_sg_segs, int, 0);
104 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
105 module_param_named(try_direct_io, try_direct_io, int, 0);
106 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
107 module_param_named(debug_flag, debug_flag, int, 0);
108 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
111 /* Extra parameters for testing */
112 module_param_named(try_rdio, try_rdio, int, 0);
113 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
114 module_param_named(try_wdio, try_wdio, int, 0);
115 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
118 static int write_threshold_kbs; /* retained for compatibility */
119 static struct st_dev_parm {
122 } parms[] __initdata = {
124 "buffer_kbs", &buffer_kbs
126 { /* Retained for compatibility with 2.4 */
127 "write_threshold_kbs", &write_threshold_kbs
133 "try_direct_io", &try_direct_io
136 "debug_flag", &debug_flag
141 /* Restrict the number of modes so that names for all are assigned */
142 #if ST_NBR_MODES > 16
143 #error "Maximum number of modes is 16"
145 /* Bit reversed order to get same names for same minors with all
147 static const char *st_formats[] = {
148 "", "r", "k", "s", "l", "t", "o", "u",
149 "m", "v", "p", "x", "a", "y", "q", "z"};
151 /* The default definitions have been moved to st_options.h */
153 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
155 /* The buffer size should fit into the 24 bits for length in the
156 6-byte SCSI read and write commands. */
157 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
158 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
161 static int debugging = DEBUG;
163 #define MAX_RETRIES 0
164 #define MAX_WRITE_RETRIES 0
165 #define MAX_READY_RETRIES 0
166 #define NO_TAPE NOT_READY
168 #define ST_TIMEOUT (900 * HZ)
169 #define ST_LONG_TIMEOUT (14000 * HZ)
171 /* Remove mode bits and auto-rewind bit (7) */
172 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
173 (iminor(x) & ((1 << ST_MODE_SHIFT)-1)))
174 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
176 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
177 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
178 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
180 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
182 #define SET_DENS_AND_BLK 0x10001
184 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
185 static int st_max_sg_segs = ST_MAX_SG;
187 static int modes_defined;
189 static int enlarge_buffer(struct st_buffer *, int, int);
190 static void clear_buffer(struct st_buffer *);
191 static void normalize_buffer(struct st_buffer *);
192 static int append_to_buffer(const char __user *, struct st_buffer *, int);
193 static int from_buffer(struct st_buffer *, char __user *, int);
194 static void move_buffer_data(struct st_buffer *, int);
196 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
197 unsigned long, size_t, int);
198 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
200 static int st_probe(struct device *);
201 static int st_remove(struct device *);
203 static struct scsi_driver st_template = {
206 .owner = THIS_MODULE,
209 .groups = st_drv_groups,
213 static int st_compression(struct scsi_tape *, int);
215 static int find_partition(struct scsi_tape *);
216 static int switch_partition(struct scsi_tape *);
218 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
220 static void scsi_tape_release(struct kref *);
222 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
224 static DEFINE_MUTEX(st_ref_mutex);
225 static DEFINE_SPINLOCK(st_index_lock);
226 static DEFINE_SPINLOCK(st_use_lock);
227 static DEFINE_IDR(st_index_idr);
231 #include "osst_detect.h"
232 #ifndef SIGS_FROM_OSST
233 #define SIGS_FROM_OSST \
234 {"OnStream", "SC-", "", "osst"}, \
235 {"OnStream", "DI-", "", "osst"}, \
236 {"OnStream", "DP-", "", "osst"}, \
237 {"OnStream", "USB", "", "osst"}, \
238 {"OnStream", "FW-", "", "osst"}
241 static struct scsi_tape *scsi_tape_get(int dev)
243 struct scsi_tape *STp = NULL;
245 mutex_lock(&st_ref_mutex);
246 spin_lock(&st_index_lock);
248 STp = idr_find(&st_index_idr, dev);
251 kref_get(&STp->kref);
256 if (scsi_device_get(STp->device))
262 kref_put(&STp->kref, scsi_tape_release);
265 spin_unlock(&st_index_lock);
266 mutex_unlock(&st_ref_mutex);
270 static void scsi_tape_put(struct scsi_tape *STp)
272 struct scsi_device *sdev = STp->device;
274 mutex_lock(&st_ref_mutex);
275 kref_put(&STp->kref, scsi_tape_release);
276 scsi_device_put(sdev);
277 mutex_unlock(&st_ref_mutex);
280 struct st_reject_data {
284 char *driver_hint; /* Name of the correct driver, NULL if unknown */
287 static struct st_reject_data reject_list[] = {
288 /* {"XXX", "Yy-", "", NULL}, example */
292 /* If the device signature is on the list of incompatible drives, the
293 function returns a pointer to the name of the correct driver (if known) */
294 static char * st_incompatible(struct scsi_device* SDp)
296 struct st_reject_data *rp;
298 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
299 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
300 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
301 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
303 return rp->driver_hint;
311 static inline char *tape_name(struct scsi_tape *tape)
313 return tape->disk->disk_name;
316 #define st_printk(prefix, t, fmt, a...) \
317 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
319 #define DEBC_printk(t, fmt, a...) \
320 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
322 #define DEBC_printk(t, fmt, a...)
325 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
328 const u8 *sense = SRpnt->sense;
330 s->have_sense = scsi_normalize_sense(SRpnt->sense,
331 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
337 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
338 switch (sense[0] & 0x7f) {
344 s->flags = sense[2] & 0xe0;
351 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
352 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
359 /* Convert the result to success code */
360 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
362 int result = SRpnt->result;
364 DEB(const char *stp;)
365 char *name = tape_name(STp);
366 struct st_cmdstatus *cmdstatp;
371 cmdstatp = &STp->buffer->cmdstat;
372 st_analyze_sense(SRpnt, cmdstatp);
374 if (cmdstatp->have_sense)
375 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
381 st_printk(ST_DEB_MSG, STp,
382 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
383 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
384 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
385 if (cmdstatp->have_sense)
386 __scsi_print_sense(STp->device, name,
387 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
389 if (!debugging) { /* Abnormal conditions for tape */
390 if (!cmdstatp->have_sense)
391 st_printk(KERN_WARNING, STp,
392 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
393 result, driver_byte(result), host_byte(result));
394 else if (cmdstatp->have_sense &&
396 scode != RECOVERED_ERROR &&
397 /* scode != UNIT_ATTENTION && */
398 scode != BLANK_CHECK &&
399 scode != VOLUME_OVERFLOW &&
400 SRpnt->cmd[0] != MODE_SENSE &&
401 SRpnt->cmd[0] != TEST_UNIT_READY) {
403 __scsi_print_sense(STp->device, name,
404 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
408 if (cmdstatp->fixed_format &&
409 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
410 if (STp->cln_sense_value)
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) == STp->cln_sense_value);
414 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
415 STp->cln_sense_mask) != 0);
417 if (cmdstatp->have_sense &&
418 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
419 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
421 STp->pos_unknown |= STp->device->was_reset;
423 if (cmdstatp->have_sense &&
424 scode == RECOVERED_ERROR
425 #if ST_RECOVERED_WRITE_FATAL
426 && SRpnt->cmd[0] != WRITE_6
427 && SRpnt->cmd[0] != WRITE_FILEMARKS
430 STp->recover_count++;
435 if (SRpnt->cmd[0] == READ_6)
437 else if (SRpnt->cmd[0] == WRITE_6)
441 st_printk(ST_DEB_MSG, STp,
442 "Recovered %s error (%d).\n",
443 stp, STp->recover_count);
446 if (cmdstatp->flags == 0)
452 static struct st_request *st_allocate_request(struct scsi_tape *stp)
454 struct st_request *streq;
456 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
460 st_printk(KERN_ERR, stp,
461 "Can't get SCSI request.\n");
462 if (signal_pending(current))
463 stp->buffer->syscall_result = -EINTR;
465 stp->buffer->syscall_result = -EBUSY;
471 static void st_release_request(struct st_request *streq)
476 static void st_do_stats(struct scsi_tape *STp, struct request *req)
481 if (scsi_req(req)->cmd[0] == WRITE_6) {
482 now = ktime_sub(now, STp->stats->write_time);
483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
485 atomic64_inc(&STp->stats->write_cnt);
486 if (scsi_req(req)->result) {
487 atomic64_add(atomic_read(&STp->stats->last_write_size)
488 - STp->buffer->cmdstat.residual,
489 &STp->stats->write_byte_cnt);
490 if (STp->buffer->cmdstat.residual > 0)
491 atomic64_inc(&STp->stats->resid_cnt);
493 atomic64_add(atomic_read(&STp->stats->last_write_size),
494 &STp->stats->write_byte_cnt);
495 } else if (scsi_req(req)->cmd[0] == READ_6) {
496 now = ktime_sub(now, STp->stats->read_time);
497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
499 atomic64_inc(&STp->stats->read_cnt);
500 if (scsi_req(req)->result) {
501 atomic64_add(atomic_read(&STp->stats->last_read_size)
502 - STp->buffer->cmdstat.residual,
503 &STp->stats->read_byte_cnt);
504 if (STp->buffer->cmdstat.residual > 0)
505 atomic64_inc(&STp->stats->resid_cnt);
507 atomic64_add(atomic_read(&STp->stats->last_read_size),
508 &STp->stats->read_byte_cnt);
510 now = ktime_sub(now, STp->stats->other_time);
511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
512 atomic64_inc(&STp->stats->other_cnt);
514 atomic64_dec(&STp->stats->in_flight);
517 static void st_scsi_execute_end(struct request *req, blk_status_t status)
519 struct st_request *SRpnt = req->end_io_data;
520 struct scsi_request *rq = scsi_req(req);
521 struct scsi_tape *STp = SRpnt->stp;
524 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
525 STp->buffer->cmdstat.residual = rq->resid_len;
527 st_do_stats(STp, req);
531 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
533 complete(SRpnt->waiting);
535 blk_rq_unmap_user(tmp);
536 blk_put_request(req);
539 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
540 int data_direction, void *buffer, unsigned bufflen,
541 int timeout, int retries)
544 struct scsi_request *rq;
545 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
547 struct scsi_tape *STp = SRpnt->stp;
549 req = blk_get_request(SRpnt->stp->device->request_queue,
550 data_direction == DMA_TO_DEVICE ?
551 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
553 return DRIVER_ERROR << 24;
555 req->rq_flags |= RQF_QUIET;
557 mdata->null_mapped = 1;
560 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
563 blk_put_request(req);
564 return DRIVER_ERROR << 24;
568 atomic64_inc(&STp->stats->in_flight);
569 if (cmd[0] == WRITE_6) {
570 atomic_set(&STp->stats->last_write_size, bufflen);
571 STp->stats->write_time = ktime_get();
572 } else if (cmd[0] == READ_6) {
573 atomic_set(&STp->stats->last_read_size, bufflen);
574 STp->stats->read_time = ktime_get();
576 STp->stats->other_time = ktime_get();
579 SRpnt->bio = req->bio;
580 rq->cmd_len = COMMAND_SIZE(cmd[0]);
581 memset(rq->cmd, 0, BLK_MAX_CDB);
582 memcpy(rq->cmd, cmd, rq->cmd_len);
583 req->timeout = timeout;
584 rq->retries = retries;
585 req->end_io_data = SRpnt;
587 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
591 /* Do the scsi command. Waits until command performed if do_wait is true.
592 Otherwise write_behind_check() is used to check that the command
594 static struct st_request *
595 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
596 int bytes, int direction, int timeout, int retries, int do_wait)
598 struct completion *waiting;
599 struct rq_map_data *mdata = &STp->buffer->map_data;
602 /* if async, make sure there's no command outstanding */
603 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
604 st_printk(KERN_ERR, STp,
605 "Async command already active.\n");
606 if (signal_pending(current))
607 (STp->buffer)->syscall_result = (-EINTR);
609 (STp->buffer)->syscall_result = (-EBUSY);
614 SRpnt = st_allocate_request(STp);
619 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
620 which IO is outstanding. It's nulled out when the IO completes. */
622 (STp->buffer)->last_SRpnt = SRpnt;
624 waiting = &STp->wait;
625 init_completion(waiting);
626 SRpnt->waiting = waiting;
628 if (STp->buffer->do_dio) {
629 mdata->page_order = 0;
630 mdata->nr_entries = STp->buffer->sg_segs;
631 mdata->pages = STp->buffer->mapped_pages;
633 mdata->page_order = STp->buffer->reserved_page_order;
635 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
636 mdata->pages = STp->buffer->reserved_pages;
640 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
641 STp->buffer->cmdstat.have_sense = 0;
642 STp->buffer->syscall_result = 0;
644 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
647 /* could not allocate the buffer or request was too large */
648 (STp->buffer)->syscall_result = (-EBUSY);
649 (STp->buffer)->last_SRpnt = NULL;
650 } else if (do_wait) {
651 wait_for_completion(waiting);
652 SRpnt->waiting = NULL;
653 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
660 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
661 write has been correct but EOM early warning reached, -EIO if write ended in
662 error or zero if write successful. Asynchronous writes are used only in
663 variable block mode. */
664 static int write_behind_check(struct scsi_tape * STp)
667 struct st_buffer *STbuffer;
668 struct st_partstat *STps;
669 struct st_cmdstatus *cmdstatp;
670 struct st_request *SRpnt;
672 STbuffer = STp->buffer;
673 if (!STbuffer->writing)
677 if (STp->write_pending)
683 wait_for_completion(&(STp->wait));
684 SRpnt = STbuffer->last_SRpnt;
685 STbuffer->last_SRpnt = NULL;
686 SRpnt->waiting = NULL;
688 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
689 st_release_request(SRpnt);
691 STbuffer->buffer_bytes -= STbuffer->writing;
692 STps = &(STp->ps[STp->partition]);
693 if (STps->drv_block >= 0) {
694 if (STp->block_size == 0)
697 STps->drv_block += STbuffer->writing / STp->block_size;
700 cmdstatp = &STbuffer->cmdstat;
701 if (STbuffer->syscall_result) {
703 if (cmdstatp->have_sense && !cmdstatp->deferred &&
704 (cmdstatp->flags & SENSE_EOM) &&
705 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
706 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
707 /* EOM at write-behind, has all data been written? */
708 if (!cmdstatp->remainder_valid ||
709 cmdstatp->uremainder64 == 0)
713 STps->drv_block = -1;
715 STbuffer->writing = 0;
717 DEB(if (debugging && retval)
718 st_printk(ST_DEB_MSG, STp,
719 "Async write error %x, return value %d.\n",
720 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
726 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
727 it messes up the block number). */
728 static int cross_eof(struct scsi_tape * STp, int forward)
730 struct st_request *SRpnt;
731 unsigned char cmd[MAX_COMMAND_SIZE];
734 cmd[1] = 0x01; /* Space FileMarks */
739 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
742 DEBC_printk(STp, "Stepping over filemark %s.\n",
743 forward ? "forward" : "backward");
745 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
746 STp->device->request_queue->rq_timeout,
749 return (STp->buffer)->syscall_result;
751 st_release_request(SRpnt);
754 if ((STp->buffer)->cmdstat.midlevel_result != 0)
755 st_printk(KERN_ERR, STp,
756 "Stepping over filemark %s failed.\n",
757 forward ? "forward" : "backward");
759 return (STp->buffer)->syscall_result;
763 /* Flush the write buffer (never need to write if variable blocksize). */
764 static int st_flush_write_buffer(struct scsi_tape * STp)
768 unsigned char cmd[MAX_COMMAND_SIZE];
769 struct st_request *SRpnt;
770 struct st_partstat *STps;
772 result = write_behind_check(STp);
777 if (STp->dirty == 1) {
779 transfer = STp->buffer->buffer_bytes;
780 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
782 memset(cmd, 0, MAX_COMMAND_SIZE);
785 blks = transfer / STp->block_size;
790 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
791 STp->device->request_queue->rq_timeout,
792 MAX_WRITE_RETRIES, 1);
794 return (STp->buffer)->syscall_result;
796 STps = &(STp->ps[STp->partition]);
797 if ((STp->buffer)->syscall_result != 0) {
798 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
800 if (cmdstatp->have_sense && !cmdstatp->deferred &&
801 (cmdstatp->flags & SENSE_EOM) &&
802 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
803 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
804 (!cmdstatp->remainder_valid ||
805 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
807 (STp->buffer)->buffer_bytes = 0;
808 if (STps->drv_block >= 0)
809 STps->drv_block += blks;
812 st_printk(KERN_ERR, STp, "Error on flush.\n");
813 STps->drv_block = (-1);
817 if (STps->drv_block >= 0)
818 STps->drv_block += blks;
820 (STp->buffer)->buffer_bytes = 0;
822 st_release_request(SRpnt);
829 /* Flush the tape buffer. The tape will be positioned correctly unless
830 seek_next is true. */
831 static int flush_buffer(struct scsi_tape *STp, int seek_next)
833 int backspace, result;
834 struct st_partstat *STps;
837 * If there was a bus reset, block further access
840 if (STp->pos_unknown)
843 if (STp->ready != ST_READY)
845 STps = &(STp->ps[STp->partition]);
846 if (STps->rw == ST_WRITING) /* Writing */
847 return st_flush_write_buffer(STp);
849 if (STp->block_size == 0)
852 backspace = ((STp->buffer)->buffer_bytes +
853 (STp->buffer)->read_pointer) / STp->block_size -
854 ((STp->buffer)->read_pointer + STp->block_size - 1) /
856 (STp->buffer)->buffer_bytes = 0;
857 (STp->buffer)->read_pointer = 0;
860 if (STps->eof == ST_FM_HIT) {
861 result = cross_eof(STp, 0); /* Back over the EOF hit */
863 STps->eof = ST_NOEOF;
865 if (STps->drv_file >= 0)
870 if (!result && backspace > 0)
871 result = st_int_ioctl(STp, MTBSR, backspace);
872 } else if (STps->eof == ST_FM_HIT) {
873 if (STps->drv_file >= 0)
876 STps->eof = ST_NOEOF;
882 /* Set the mode parameters */
883 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
888 if (!STp->density_changed &&
889 STm->default_density >= 0 &&
890 STm->default_density != STp->density) {
891 arg = STm->default_density;
895 arg <<= MT_ST_DENSITY_SHIFT;
896 if (!STp->blksize_changed &&
897 STm->default_blksize >= 0 &&
898 STm->default_blksize != STp->block_size) {
899 arg |= STm->default_blksize;
902 arg |= STp->block_size;
904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
905 st_printk(KERN_WARNING, STp,
906 "Can't set default block size to %d bytes "
908 STm->default_blksize, STm->default_density);
916 /* Lock or unlock the drive door. Don't use when st_request allocated. */
917 static int do_door_lock(struct scsi_tape * STp, int do_lock)
921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
923 retval = scsi_set_medium_removal(STp->device,
924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
928 STp->door_locked = ST_LOCK_FAILS;
933 /* Set the internal state after reset */
934 static void reset_state(struct scsi_tape *STp)
937 struct st_partstat *STps;
939 STp->pos_unknown = 0;
940 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
941 STps = &(STp->ps[i]);
943 STps->eof = ST_NOEOF;
945 STps->last_block_valid = 0;
946 STps->drv_block = -1;
949 if (STp->can_partitions) {
950 STp->partition = find_partition(STp);
951 if (STp->partition < 0)
953 STp->new_partition = STp->partition;
957 /* Test if the drive is ready. Returns either one of the codes below or a negative system
959 #define CHKRES_READY 0
960 #define CHKRES_NEW_SESSION 1
961 #define CHKRES_NOT_READY 2
962 #define CHKRES_NO_TAPE 3
964 #define MAX_ATTENTIONS 10
966 static int test_ready(struct scsi_tape *STp, int do_wait)
968 int attentions, waits, max_wait, scode;
969 int retval = CHKRES_READY, new_session = 0;
970 unsigned char cmd[MAX_COMMAND_SIZE];
971 struct st_request *SRpnt = NULL;
972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
976 for (attentions=waits=0; ; ) {
977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
978 cmd[0] = TEST_UNIT_READY;
979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
980 STp->long_timeout, MAX_READY_RETRIES, 1);
983 retval = (STp->buffer)->syscall_result;
987 if (cmdstatp->have_sense) {
989 scode = cmdstatp->sense_hdr.sense_key;
991 if (scode == UNIT_ATTENTION) { /* New media? */
993 if (attentions < MAX_ATTENTIONS) {
1003 if (scode == NOT_READY) {
1004 if (waits < max_wait) {
1005 if (msleep_interruptible(1000)) {
1013 if ((STp->device)->scsi_level >= SCSI_2 &&
1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1015 retval = CHKRES_NO_TAPE;
1017 retval = CHKRES_NOT_READY;
1023 retval = (STp->buffer)->syscall_result;
1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1030 st_release_request(SRpnt);
1035 /* See if the drive is ready and gather information about the tape. Return values:
1036 < 0 negative error code from errno.h
1038 1 drive not ready (possibly no tape)
1040 static int check_tape(struct scsi_tape *STp, struct file *filp)
1042 int i, retval, new_session = 0, do_wait;
1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1044 unsigned short st_flags = filp->f_flags;
1045 struct st_request *SRpnt = NULL;
1046 struct st_modedef *STm;
1047 struct st_partstat *STps;
1048 struct inode *inode = file_inode(filp);
1049 int mode = TAPE_MODE(inode);
1051 STp->ready = ST_READY;
1053 if (mode != STp->current_mode) {
1054 DEBC_printk(STp, "Mode change from %d to %d.\n",
1055 STp->current_mode, mode);
1057 STp->current_mode = mode;
1059 STm = &(STp->modes[STp->current_mode]);
1061 saved_cleaning = STp->cleaning_req;
1062 STp->cleaning_req = 0;
1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1065 retval = test_ready(STp, do_wait);
1070 if (retval == CHKRES_NEW_SESSION) {
1071 STp->pos_unknown = 0;
1072 STp->partition = STp->new_partition = 0;
1073 if (STp->can_partitions)
1074 STp->nbr_partitions = 1; /* This guess will be updated later
1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1077 STps = &(STp->ps[i]);
1079 STps->eof = ST_NOEOF;
1081 STps->last_block_valid = 0;
1082 STps->drv_block = 0;
1088 STp->cleaning_req |= saved_cleaning;
1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1091 if (retval == CHKRES_NO_TAPE)
1092 STp->ready = ST_NO_TAPE;
1094 STp->ready = ST_NOT_READY;
1096 STp->density = 0; /* Clear the erroneous "residue" */
1097 STp->write_prot = 0;
1098 STp->block_size = 0;
1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1100 STp->partition = STp->new_partition = 0;
1101 STp->door_locked = ST_UNLOCKED;
1102 return CHKRES_NOT_READY;
1106 if (STp->omit_blklims)
1107 STp->min_block = STp->max_block = (-1);
1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1110 cmd[0] = READ_BLOCK_LIMITS;
1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1113 STp->device->request_queue->rq_timeout,
1114 MAX_READY_RETRIES, 1);
1116 retval = (STp->buffer)->syscall_result;
1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1124 (STp->buffer)->b_data[5];
1125 if ( DEB( debugging || ) !STp->inited)
1126 st_printk(KERN_INFO, STp,
1127 "Block limits %d - %d bytes.\n",
1128 STp->min_block, STp->max_block);
1130 STp->min_block = STp->max_block = (-1);
1131 DEBC_printk(STp, "Can't read block limits.\n");
1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1136 cmd[0] = MODE_SENSE;
1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1140 STp->device->request_queue->rq_timeout,
1141 MAX_READY_RETRIES, 1);
1143 retval = (STp->buffer)->syscall_result;
1147 if ((STp->buffer)->syscall_result != 0) {
1148 DEBC_printk(STp, "No Mode Sense.\n");
1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1151 STp->drv_write_prot = 0;
1153 DEBC_printk(STp,"Mode sense. Length %d, "
1154 "medium %x, WBS %x, BLL %d\n",
1155 (STp->buffer)->b_data[0],
1156 (STp->buffer)->b_data[1],
1157 (STp->buffer)->b_data[2],
1158 (STp->buffer)->b_data[3]);
1160 if ((STp->buffer)->b_data[3] >= 8) {
1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1162 STp->density = (STp->buffer)->b_data[4];
1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
1165 DEBC_printk(STp, "Density %x, tape length: %x, "
1168 (STp->buffer)->b_data[5] * 65536 +
1169 (STp->buffer)->b_data[6] * 256 +
1170 (STp->buffer)->b_data[7],
1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
1174 if (!STp->drv_buffer && STp->immediate_filemark) {
1175 st_printk(KERN_WARNING, STp,
1176 "non-buffered tape: disabling "
1177 "writing immediate filemarks\n");
1178 STp->immediate_filemark = 0;
1181 st_release_request(SRpnt);
1185 if (STp->block_size > 0)
1186 (STp->buffer)->buffer_blocks =
1187 (STp->buffer)->buffer_size / STp->block_size;
1189 (STp->buffer)->buffer_blocks = 1;
1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1193 STp->block_size, (STp->buffer)->buffer_size,
1194 (STp->buffer)->buffer_blocks);
1196 if (STp->drv_write_prot) {
1197 STp->write_prot = 1;
1199 DEBC_printk(STp, "Write protected\n");
1202 ((st_flags & O_ACCMODE) == O_WRONLY ||
1203 (st_flags & O_ACCMODE) == O_RDWR)) {
1209 if (STp->can_partitions && STp->nbr_partitions < 1) {
1210 /* This code is reached when the device is opened for the first time
1211 after the driver has been initialized with tape in the drive and the
1212 partition support has been enabled. */
1213 DEBC_printk(STp, "Updating partition number in status.\n");
1214 if ((STp->partition = find_partition(STp)) < 0) {
1215 retval = STp->partition;
1218 STp->new_partition = STp->partition;
1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1222 if (new_session) { /* Change the drive parameters for the new mode */
1223 STp->density_changed = STp->blksize_changed = 0;
1224 STp->compression_changed = 0;
1225 if (!(STm->defaults_for_writes) &&
1226 (retval = set_mode_densblk(STp, STm)) < 0)
1229 if (STp->default_drvbuffer != 0xff) {
1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
1231 st_printk(KERN_WARNING, STp,
1232 "Can't set default drive "
1233 "buffering to %d.\n",
1234 STp->default_drvbuffer);
1238 return CHKRES_READY;
1245 \f/* Open the device. Needs to take the BKL only because of incrementing the SCSI host
1247 static int st_open(struct inode *inode, struct file *filp)
1249 int i, retval = (-EIO);
1251 struct scsi_tape *STp;
1252 struct st_partstat *STps;
1253 int dev = TAPE_NR(inode);
1256 * We really want to do nonseekable_open(inode, filp); here, but some
1257 * versions of tar incorrectly call lseek on tapes and bail out if that
1258 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1262 if (!(STp = scsi_tape_get(dev))) {
1266 filp->private_data = STp;
1268 spin_lock(&st_use_lock);
1270 spin_unlock(&st_use_lock);
1272 DEBC_printk(STp, "Device already in use.\n");
1277 spin_unlock(&st_use_lock);
1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1280 if (scsi_autopm_get_device(STp->device) < 0) {
1285 if (!scsi_block_when_processing_errors(STp->device)) {
1290 /* See that we have at least a one page buffer available */
1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
1292 st_printk(KERN_WARNING, STp,
1293 "Can't allocate one page tape buffer.\n");
1294 retval = (-EOVERFLOW);
1298 (STp->buffer)->cleared = 0;
1299 (STp->buffer)->writing = 0;
1300 (STp->buffer)->syscall_result = 0;
1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1306 STps = &(STp->ps[i]);
1309 STp->try_dio_now = STp->try_dio;
1310 STp->recover_count = 0;
1311 DEB( STp->nbr_waits = STp->nbr_finished = 0;
1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
1314 retval = check_tape(STp, filp);
1317 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1318 retval != CHKRES_READY) {
1319 if (STp->ready == NO_TAPE)
1320 retval = (-ENOMEDIUM);
1328 normalize_buffer(STp->buffer);
1329 spin_lock(&st_use_lock);
1331 spin_unlock(&st_use_lock);
1333 scsi_autopm_put_device(STp->device);
1340 /* Flush the tape buffer before close */
1341 static int st_flush(struct file *filp, fl_owner_t id)
1343 int result = 0, result2;
1344 unsigned char cmd[MAX_COMMAND_SIZE];
1345 struct st_request *SRpnt;
1346 struct scsi_tape *STp = filp->private_data;
1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1348 struct st_partstat *STps = &(STp->ps[STp->partition]);
1350 if (file_count(filp) > 1)
1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1354 result = st_flush_write_buffer(STp);
1355 if (result != 0 && result != (-ENOSPC))
1359 if (STp->can_partitions &&
1360 (result2 = switch_partition(STp)) < 0) {
1361 DEBC_printk(STp, "switch_partition at close failed.\n");
1367 DEBC( if (STp->nbr_requests)
1368 st_printk(KERN_DEBUG, STp,
1369 "Number of r/w requests %d, dio used in %d, "
1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1378 STp->nbr_waits, STp->nbr_finished);
1380 memset(cmd, 0, MAX_COMMAND_SIZE);
1381 cmd[0] = WRITE_FILEMARKS;
1382 if (STp->immediate_filemark)
1384 cmd[4] = 1 + STp->two_fm;
1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1387 STp->device->request_queue->rq_timeout,
1388 MAX_WRITE_RETRIES, 1);
1390 result = (STp->buffer)->syscall_result;
1394 if (STp->buffer->syscall_result == 0 ||
1395 (cmdstatp->have_sense && !cmdstatp->deferred &&
1396 (cmdstatp->flags & SENSE_EOM) &&
1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1400 /* Write successful at EOM */
1401 st_release_request(SRpnt);
1403 if (STps->drv_file >= 0)
1405 STps->drv_block = 0;
1410 else { /* Write error */
1411 st_release_request(SRpnt);
1413 st_printk(KERN_ERR, STp,
1414 "Error on write filemark.\n");
1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
1420 } else if (!STp->rew_at_close) {
1421 STps = &(STp->ps[STp->partition]);
1422 if (!STm->sysv || STps->rw != ST_READING) {
1424 result = flush_buffer(STp, 0);
1425 else if (STps->eof == ST_FM_HIT) {
1426 result = cross_eof(STp, 0);
1428 if (STps->drv_file >= 0)
1430 STps->drv_block = 0;
1433 STps->eof = ST_NOEOF;
1435 } else if ((STps->eof == ST_NOEOF &&
1436 !(result = cross_eof(STp, 1))) ||
1437 STps->eof == ST_FM_HIT) {
1438 if (STps->drv_file >= 0)
1440 STps->drv_block = 0;
1446 if (STp->rew_at_close) {
1447 result2 = st_int_ioctl(STp, MTREW, 1);
1455 /* Close the device and release it. BKL is not needed: this is the only thread
1456 accessing this tape. */
1457 static int st_release(struct inode *inode, struct file *filp)
1460 struct scsi_tape *STp = filp->private_data;
1462 if (STp->door_locked == ST_LOCKED_AUTO)
1463 do_door_lock(STp, 0);
1465 normalize_buffer(STp->buffer);
1466 spin_lock(&st_use_lock);
1468 spin_unlock(&st_use_lock);
1469 scsi_autopm_put_device(STp->device);
1475 /* The checks common to both reading and writing */
1476 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1481 * If we are in the middle of error recovery, don't let anyone
1482 * else try and use this device. Also, if error recovery fails, it
1483 * may try and take the device offline, in which case all further
1484 * access to the device is prohibited.
1486 if (!scsi_block_when_processing_errors(STp->device)) {
1491 if (STp->ready != ST_READY) {
1492 if (STp->ready == ST_NO_TAPE)
1493 retval = (-ENOMEDIUM);
1499 if (! STp->modes[STp->current_mode].defined) {
1506 * If there was a bus reset, block further access
1509 if (STp->pos_unknown) {
1519 st_printk(ST_DEB_MSG, STp,
1520 "Incorrect device.\n");
1525 if (STp->can_partitions &&
1526 (retval = switch_partition(STp)) < 0)
1529 if (STp->block_size == 0 && STp->max_block > 0 &&
1530 (count < STp->min_block || count > STp->max_block)) {
1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1536 !do_door_lock(STp, 1))
1537 STp->door_locked = ST_LOCKED_AUTO;
1544 static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1545 size_t count, int is_read)
1547 int i, bufsize, retval = 0;
1548 struct st_buffer *STbp = STp->buffer;
1551 i = STp->try_dio_now && try_rdio;
1553 i = STp->try_dio_now && try_wdio;
1555 if (i && ((unsigned long)buf & queue_dma_alignment(
1556 STp->device->request_queue)) == 0) {
1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1558 count, (is_read ? READ : WRITE));
1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1564 STbp->do_dio = 0; /* fall back to buffering with any error */
1565 STbp->sg_segs = STbp->do_dio;
1569 STp->nbr_pages += STbp->do_dio;
1574 DEB( STp->nbr_requests++; )
1576 if (!STbp->do_dio) {
1577 if (STp->block_size)
1578 bufsize = STp->block_size > st_fixed_buffer_size ?
1579 STp->block_size : st_fixed_buffer_size;
1582 /* Make sure that data from previous user is not leaked even if
1583 HBA does not return correct residual */
1584 if (is_read && STp->sili && !STbp->cleared)
1588 if (bufsize > STbp->buffer_size &&
1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
1590 st_printk(KERN_WARNING, STp,
1591 "Can't allocate %d byte tape buffer.\n",
1593 retval = (-EOVERFLOW);
1596 if (STp->block_size)
1597 STbp->buffer_blocks = bufsize / STp->block_size;
1605 /* Can be called more than once after each setup_buffer() */
1606 static void release_buffering(struct scsi_tape *STp, int is_read)
1608 struct st_buffer *STbp;
1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
1621 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1624 ssize_t i, do_count, blks, transfer;
1626 int undone, retry_eot = 0, scode;
1628 unsigned char cmd[MAX_COMMAND_SIZE];
1629 const char __user *b_point;
1630 struct st_request *SRpnt = NULL;
1631 struct scsi_tape *STp = filp->private_data;
1632 struct st_modedef *STm;
1633 struct st_partstat *STps;
1634 struct st_buffer *STbp;
1636 if (mutex_lock_interruptible(&STp->lock))
1637 return -ERESTARTSYS;
1639 retval = rw_checks(STp, filp, count);
1640 if (retval || count == 0)
1643 /* Write must be integral number of blocks */
1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
1645 st_printk(KERN_WARNING, STp,
1646 "Write not multiple of tape block size.\n");
1651 STm = &(STp->modes[STp->current_mode]);
1652 STps = &(STp->ps[STp->partition]);
1654 if (STp->write_prot) {
1660 if (STps->rw == ST_READING) {
1661 retval = flush_buffer(STp, 0);
1664 STps->rw = ST_WRITING;
1665 } else if (STps->rw != ST_WRITING &&
1666 STps->drv_file == 0 && STps->drv_block == 0) {
1667 if ((retval = set_mode_densblk(STp, STm)) < 0)
1669 if (STm->default_compression != ST_DONT_TOUCH &&
1670 !(STp->compression_changed)) {
1671 if (st_compression(STp, (STm->default_compression == ST_YES))) {
1672 st_printk(KERN_WARNING, STp,
1673 "Can't set default compression.\n");
1674 if (modes_defined) {
1683 i = write_behind_check(STp);
1686 STps->eof = ST_EOM_OK;
1688 STps->eof = ST_EOM_ERROR;
1691 if (STps->eof == ST_EOM_OK) {
1692 STps->eof = ST_EOD_1; /* allow next write */
1696 else if (STps->eof == ST_EOM_ERROR) {
1701 /* Check the buffer readability in cases where copy_user might catch
1702 the problems after some tape movement. */
1703 if (STp->block_size != 0 &&
1705 (copy_from_user(&i, buf, 1) != 0 ||
1706 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1711 retval = setup_buffering(STp, buf, count, 0);
1717 memset(cmd, 0, MAX_COMMAND_SIZE);
1719 cmd[1] = (STp->block_size != 0);
1721 STps->rw = ST_WRITING;
1724 while (count > 0 && !retry_eot) {
1730 if (STp->block_size == 0)
1733 do_count = STbp->buffer_blocks * STp->block_size -
1735 if (do_count > count)
1739 i = append_to_buffer(b_point, STbp, do_count);
1746 b_point += do_count;
1748 async_write = STp->block_size == 0 && !STbp->do_dio &&
1749 STm->do_async_writes && STps->eof < ST_EOM_OK;
1751 if (STp->block_size != 0 && STm->do_buffer_writes &&
1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
1753 STbp->buffer_bytes < STbp->buffer_size) {
1755 /* Don't write a buffer that is not full enough. */
1756 if (!async_write && count == 0)
1761 if (STp->block_size == 0)
1762 blks = transfer = do_count;
1765 blks = STbp->buffer_bytes;
1768 blks /= STp->block_size;
1769 transfer = blks * STp->block_size;
1771 cmd[2] = blks >> 16;
1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
1776 STp->device->request_queue->rq_timeout,
1777 MAX_WRITE_RETRIES, !async_write);
1779 retval = STbp->syscall_result;
1782 if (async_write && !STbp->syscall_result) {
1783 STbp->writing = transfer;
1784 STp->dirty = !(STbp->writing ==
1785 STbp->buffer_bytes);
1786 SRpnt = NULL; /* Prevent releasing this request! */
1787 DEB( STp->write_pending = 1; )
1791 if (STbp->syscall_result != 0) {
1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1794 DEBC_printk(STp, "Error on write:\n");
1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1796 scode = cmdstatp->sense_hdr.sense_key;
1797 if (cmdstatp->remainder_valid)
1798 undone = (int)cmdstatp->uremainder64;
1799 else if (STp->block_size == 0 &&
1800 scode == VOLUME_OVERFLOW)
1804 if (STp->block_size != 0)
1805 undone *= STp->block_size;
1806 if (undone <= do_count) {
1807 /* Only data from this write is not written */
1811 if (STp->block_size)
1812 blks = (transfer - undone) / STp->block_size;
1813 STps->eof = ST_EOM_OK;
1814 /* Continue in fixed block mode if all written
1815 in this request but still something left to write
1816 (retval left to zero)
1818 if (STp->block_size == 0 ||
1819 undone > 0 || count == 0)
1820 retval = (-ENOSPC); /* EOM within current request */
1821 DEBC_printk(STp, "EOM with %d "
1822 "bytes unwritten.\n",
1825 /* EOT within data buffered earlier (possible only
1826 in fixed block mode without direct i/o) */
1827 if (!retry_eot && !cmdstatp->deferred &&
1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1829 move_buffer_data(STp->buffer, transfer - undone);
1831 if (STps->drv_block >= 0) {
1832 STps->drv_block += (transfer - undone) /
1835 STps->eof = ST_EOM_OK;
1836 DEBC_printk(STp, "Retry "
1839 STp->buffer->buffer_bytes);
1843 /* Either error within data buffered by driver or
1846 blks = do_count = 0;
1847 STps->eof = ST_EOM_ERROR;
1848 STps->drv_block = (-1); /* Too cautious? */
1849 retval = (-EIO); /* EOM for old data */
1850 DEBC_printk(STp, "EOM with "
1856 STps->drv_block = (-1); /* Too cautious? */
1857 retval = STbp->syscall_result;
1862 if (STps->drv_block >= 0) {
1863 if (STp->block_size == 0)
1864 STps->drv_block += (do_count > 0);
1866 STps->drv_block += blks;
1869 STbp->buffer_bytes = 0;
1872 if (retval || retry_eot) {
1874 retval = total - count;
1879 if (STps->eof == ST_EOD_1)
1880 STps->eof = ST_EOM_OK;
1881 else if (STps->eof != ST_EOM_OK)
1882 STps->eof = ST_NOEOF;
1883 retval = total - count;
1887 st_release_request(SRpnt);
1888 release_buffering(STp, 0);
1889 mutex_unlock(&STp->lock);
1894 /* Read data from the tape. Returns zero in the normal case, one if the
1895 eof status has changed, and the negative error code in case of a
1896 fatal error. Otherwise updates the buffer and the eof state.
1898 Does release user buffer mapping if it is set.
1900 static long read_tape(struct scsi_tape *STp, long count,
1901 struct st_request ** aSRpnt)
1903 int transfer, blks, bytes;
1904 unsigned char cmd[MAX_COMMAND_SIZE];
1905 struct st_request *SRpnt;
1906 struct st_modedef *STm;
1907 struct st_partstat *STps;
1908 struct st_buffer *STbp;
1914 STm = &(STp->modes[STp->current_mode]);
1915 STps = &(STp->ps[STp->partition]);
1916 if (STps->eof == ST_FM_HIT)
1920 if (STp->block_size == 0)
1921 blks = bytes = count;
1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
1924 blks = (STp->buffer)->buffer_blocks;
1925 bytes = blks * STp->block_size;
1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1929 bytes = (STp->buffer)->buffer_size;
1930 blks = bytes / STp->block_size;
1931 bytes = blks * STp->block_size;
1935 memset(cmd, 0, MAX_COMMAND_SIZE);
1937 cmd[1] = (STp->block_size != 0);
1938 if (!cmd[1] && STp->sili)
1940 cmd[2] = blks >> 16;
1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
1946 STp->device->request_queue->rq_timeout,
1948 release_buffering(STp, 1);
1951 return STbp->syscall_result;
1953 STbp->read_pointer = 0;
1956 /* Something to check */
1957 if (STbp->syscall_result) {
1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1963 SRpnt->sense[0], SRpnt->sense[1],
1964 SRpnt->sense[2], SRpnt->sense[3],
1965 SRpnt->sense[4], SRpnt->sense[5],
1966 SRpnt->sense[6], SRpnt->sense[7]);
1967 if (cmdstatp->have_sense) {
1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1973 /* Compute the residual count */
1974 if (cmdstatp->remainder_valid)
1975 transfer = (int)cmdstatp->uremainder64;
1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
1979 if (STp->block_size == 0)
1981 /* Some drives set ILI with MEDIUM ERROR */
1982 cmdstatp->flags &= ~SENSE_ILI;
1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
1986 if (STp->block_size == 0 &&
1988 st_printk(KERN_NOTICE, STp,
1989 "Failed to read %d "
1990 "byte block with %d "
1994 if (STps->drv_block >= 0)
1995 STps->drv_block += 1;
1996 STbp->buffer_bytes = 0;
1998 } else if (STp->block_size == 0) {
1999 STbp->buffer_bytes = bytes - transfer;
2001 st_release_request(SRpnt);
2002 SRpnt = *aSRpnt = NULL;
2003 if (transfer == blks) { /* We did not get anything, error */
2004 st_printk(KERN_NOTICE, STp,
2007 if (STps->drv_block >= 0)
2008 STps->drv_block += blks - transfer + 1;
2009 st_int_ioctl(STp, MTBSR, 1);
2012 /* We have some data, deliver it */
2013 STbp->buffer_bytes = (blks - transfer) *
2015 DEBC_printk(STp, "ILI but "
2019 STbp->buffer_bytes);
2020 if (STps->drv_block >= 0)
2021 STps->drv_block += 1;
2022 if (st_int_ioctl(STp, MTBSR, 1))
2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2026 if (STps->eof != ST_FM_HIT)
2027 STps->eof = ST_FM_HIT;
2029 STps->eof = ST_EOD_2;
2030 if (STp->block_size == 0)
2031 STbp->buffer_bytes = 0;
2033 STbp->buffer_bytes =
2034 bytes - transfer * STp->block_size;
2035 DEBC_printk(STp, "EOF detected (%d "
2037 STbp->buffer_bytes);
2038 } else if (cmdstatp->flags & SENSE_EOM) {
2039 if (STps->eof == ST_FM)
2040 STps->eof = ST_EOD_1;
2042 STps->eof = ST_EOM_OK;
2043 if (STp->block_size == 0)
2044 STbp->buffer_bytes = bytes - transfer;
2046 STbp->buffer_bytes =
2047 bytes - transfer * STp->block_size;
2049 DEBC_printk(STp, "EOM detected (%d "
2051 STbp->buffer_bytes);
2054 /* end of EOF, EOM, ILI test */
2055 else { /* nonzero sense key */
2056 DEBC_printk(STp, "Tape error while reading.\n");
2057 STps->drv_block = (-1);
2058 if (STps->eof == ST_FM &&
2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
2060 DEBC_printk(STp, "Zero returned for "
2061 "first BLANK CHECK "
2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2064 } else /* Some other extended sense code */
2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2069 STbp->buffer_bytes = 0;
2071 /* End of extended sense test */
2072 else { /* Non-extended sense */
2073 retval = STbp->syscall_result;
2077 /* End of error handling */
2078 else { /* Read successful */
2079 STbp->buffer_bytes = bytes;
2080 if (STp->sili) /* In fixed block mode residual is always zero here */
2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2084 if (STps->drv_block >= 0) {
2085 if (STp->block_size == 0)
2088 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2096 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2100 ssize_t i, transfer;
2101 int special, do_dio = 0;
2102 struct st_request *SRpnt = NULL;
2103 struct scsi_tape *STp = filp->private_data;
2104 struct st_modedef *STm;
2105 struct st_partstat *STps;
2106 struct st_buffer *STbp = STp->buffer;
2108 if (mutex_lock_interruptible(&STp->lock))
2109 return -ERESTARTSYS;
2111 retval = rw_checks(STp, filp, count);
2112 if (retval || count == 0)
2115 STm = &(STp->modes[STp->current_mode]);
2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2117 if (!STm->do_read_ahead) {
2118 retval = (-EINVAL); /* Read must be integral number of blocks */
2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
2124 STps = &(STp->ps[STp->partition]);
2125 if (STps->rw == ST_WRITING) {
2126 retval = flush_buffer(STp, 0);
2129 STps->rw = ST_READING;
2132 if (debugging && STps->eof != ST_NOEOF)
2133 st_printk(ST_DEB_MSG, STp,
2134 "EOF/EOM flag up (%d). Bytes %d\n",
2135 STps->eof, STbp->buffer_bytes);
2138 retval = setup_buffering(STp, buf, count, 1);
2141 do_dio = STbp->do_dio;
2143 if (STbp->buffer_bytes == 0 &&
2144 STps->eof >= ST_EOD_1) {
2145 if (STps->eof < ST_EOD) {
2150 retval = (-EIO); /* EOM or Blank Check */
2155 /* Check the buffer writability before any tape movement. Don't alter
2157 if (copy_from_user(&i, buf, 1) != 0 ||
2158 copy_to_user(buf, &i, 1) != 0 ||
2159 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2160 copy_to_user(buf + count - 1, &i, 1) != 0) {
2166 STps->rw = ST_READING;
2169 /* Loop until enough data in buffer or a special condition found */
2170 for (total = 0, special = 0; total < count && !special;) {
2172 /* Get new data if the buffer is empty */
2173 if (STbp->buffer_bytes == 0) {
2174 special = read_tape(STp, count - total, &SRpnt);
2175 if (special < 0) { /* No need to continue read */
2181 /* Move the data from driver buffer to user buffer */
2182 if (STbp->buffer_bytes > 0) {
2184 if (debugging && STps->eof != ST_NOEOF)
2185 st_printk(ST_DEB_MSG, STp,
2186 "EOF up (%d). Left %d, needed %d.\n",
2187 STps->eof, STbp->buffer_bytes,
2188 (int)(count - total));
2190 transfer = STbp->buffer_bytes < count - total ?
2191 STbp->buffer_bytes : count - total;
2193 i = from_buffer(STbp, buf, transfer);
2203 if (STp->block_size == 0)
2204 break; /* Read only one variable length block */
2206 } /* for (total = 0, special = 0;
2207 total < count && !special; ) */
2209 /* Change the eof state if no data from tape or buffer */
2211 if (STps->eof == ST_FM_HIT) {
2213 STps->drv_block = 0;
2214 if (STps->drv_file >= 0)
2216 } else if (STps->eof == ST_EOD_1) {
2217 STps->eof = ST_EOD_2;
2218 STps->drv_block = 0;
2219 if (STps->drv_file >= 0)
2221 } else if (STps->eof == ST_EOD_2)
2223 } else if (STps->eof == ST_FM)
2224 STps->eof = ST_NOEOF;
2228 if (SRpnt != NULL) {
2229 st_release_request(SRpnt);
2233 release_buffering(STp, 1);
2234 STbp->buffer_bytes = 0;
2236 mutex_unlock(&STp->lock);
2244 /* Set the driver options */
2245 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
2248 st_printk(KERN_INFO, STp,
2249 "Mode %d options: buffer writes: %d, "
2250 "async writes: %d, read ahead: %d\n",
2251 STp->current_mode, STm->do_buffer_writes,
2252 STm->do_async_writes, STm->do_read_ahead);
2253 st_printk(KERN_INFO, STp,
2254 " can bsr: %d, two FMs: %d, "
2255 "fast mteom: %d, auto lock: %d,\n",
2256 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2258 st_printk(KERN_INFO, STp,
2259 " defs for wr: %d, no block limits: %d, "
2260 "partitions: %d, s2 log: %d\n",
2261 STm->defaults_for_writes, STp->omit_blklims,
2262 STp->can_partitions, STp->scsi2_logical);
2263 st_printk(KERN_INFO, STp,
2264 " sysv: %d nowait: %d sili: %d "
2265 "nowait_filemark: %d\n",
2266 STm->sysv, STp->immediate, STp->sili,
2267 STp->immediate_filemark);
2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
2274 static int st_set_options(struct scsi_tape *STp, long options)
2278 struct st_modedef *STm;
2279 struct cdev *cd0, *cd1;
2280 struct device *d0, *d1;
2282 STm = &(STp->modes[STp->current_mode]);
2283 if (!STm->defined) {
2284 cd0 = STm->cdevs[0];
2285 cd1 = STm->cdevs[1];
2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
2289 STm->cdevs[0] = cd0;
2290 STm->cdevs[1] = cd1;
2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2298 code = options & MT_ST_OPTIONS;
2299 if (code == MT_ST_BOOLEANS) {
2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2309 if ((STp->device)->scsi_level >= SCSI_2)
2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2312 STp->immediate = (options & MT_ST_NOWAIT) != 0;
2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
2314 STm->sysv = (options & MT_ST_SYSV) != 0;
2315 STp->sili = (options & MT_ST_SILI) != 0;
2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
2317 st_log_options(STp, STm); )
2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2319 value = (code == MT_ST_SETBOOLEANS);
2320 if ((options & MT_ST_BUFFER_WRITES) != 0)
2321 STm->do_buffer_writes = value;
2322 if ((options & MT_ST_ASYNC_WRITES) != 0)
2323 STm->do_async_writes = value;
2324 if ((options & MT_ST_DEF_WRITES) != 0)
2325 STm->defaults_for_writes = value;
2326 if ((options & MT_ST_READ_AHEAD) != 0)
2327 STm->do_read_ahead = value;
2328 if ((options & MT_ST_TWO_FM) != 0)
2329 STp->two_fm = value;
2330 if ((options & MT_ST_FAST_MTEOM) != 0)
2331 STp->fast_mteom = value;
2332 if ((options & MT_ST_AUTO_LOCK) != 0)
2333 STp->do_auto_lock = value;
2334 if ((options & MT_ST_CAN_BSR) != 0)
2335 STp->can_bsr = value;
2336 if ((options & MT_ST_NO_BLKLIMS) != 0)
2337 STp->omit_blklims = value;
2338 if ((STp->device)->scsi_level >= SCSI_2 &&
2339 (options & MT_ST_CAN_PARTITIONS) != 0)
2340 STp->can_partitions = value;
2341 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2342 STp->scsi2_logical = value;
2343 if ((options & MT_ST_NOWAIT) != 0)
2344 STp->immediate = value;
2345 if ((options & MT_ST_NOWAIT_EOF) != 0)
2346 STp->immediate_filemark = value;
2347 if ((options & MT_ST_SYSV) != 0)
2349 if ((options & MT_ST_SILI) != 0)
2352 if ((options & MT_ST_DEBUGGING) != 0)
2354 st_log_options(STp, STm); )
2355 } else if (code == MT_ST_WRITE_THRESHOLD) {
2356 /* Retained for compatibility */
2357 } else if (code == MT_ST_DEF_BLKSIZE) {
2358 value = (options & ~MT_ST_OPTIONS);
2359 if (value == ~MT_ST_OPTIONS) {
2360 STm->default_blksize = (-1);
2361 DEBC_printk(STp, "Default block size disabled.\n");
2363 STm->default_blksize = value;
2364 DEBC_printk(STp,"Default block size set to "
2365 "%d bytes.\n", STm->default_blksize);
2366 if (STp->ready == ST_READY) {
2367 STp->blksize_changed = 0;
2368 set_mode_densblk(STp, STm);
2371 } else if (code == MT_ST_TIMEOUTS) {
2372 value = (options & ~MT_ST_OPTIONS);
2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2376 (value & ~MT_ST_SET_LONG_TIMEOUT));
2378 blk_queue_rq_timeout(STp->device->request_queue,
2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2383 } else if (code == MT_ST_SET_CLN) {
2384 value = (options & ~MT_ST_OPTIONS) & 0xff;
2386 (value < EXTENDED_SENSE_START ||
2387 value >= SCSI_SENSE_BUFFERSIZE))
2389 STp->cln_mode = value;
2390 STp->cln_sense_mask = (options >> 8) & 0xff;
2391 STp->cln_sense_value = (options >> 16) & 0xff;
2392 st_printk(KERN_INFO, STp,
2393 "Cleaning request mode %d, mask %02x, value %02x\n",
2394 value, STp->cln_sense_mask, STp->cln_sense_value);
2395 } else if (code == MT_ST_DEF_OPTIONS) {
2396 code = (options & ~MT_ST_CLEAR_DEFAULT);
2397 value = (options & MT_ST_CLEAR_DEFAULT);
2398 if (code == MT_ST_DEF_DENSITY) {
2399 if (value == MT_ST_CLEAR_DEFAULT) {
2400 STm->default_density = (-1);
2402 "Density default disabled.\n");
2404 STm->default_density = value & 0xff;
2405 DEBC_printk(STp, "Density default set to %x\n",
2406 STm->default_density);
2407 if (STp->ready == ST_READY) {
2408 STp->density_changed = 0;
2409 set_mode_densblk(STp, STm);
2412 } else if (code == MT_ST_DEF_DRVBUFFER) {
2413 if (value == MT_ST_CLEAR_DEFAULT) {
2414 STp->default_drvbuffer = 0xff;
2416 "Drive buffer default disabled.\n");
2418 STp->default_drvbuffer = value & 7;
2420 "Drive buffer default set to %x\n",
2421 STp->default_drvbuffer);
2422 if (STp->ready == ST_READY)
2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2425 } else if (code == MT_ST_DEF_COMPRESSION) {
2426 if (value == MT_ST_CLEAR_DEFAULT) {
2427 STm->default_compression = ST_DONT_TOUCH;
2429 "Compression default disabled.\n");
2431 if ((value & 0xff00) != 0) {
2432 STp->c_algo = (value & 0xff00) >> 8;
2433 DEBC_printk(STp, "Compression "
2434 "algorithm set to 0x%x.\n",
2437 if ((value & 0xff) != 0xff) {
2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
2439 DEBC_printk(STp, "Compression default "
2442 if (STp->ready == ST_READY) {
2443 STp->compression_changed = 0;
2444 st_compression(STp, (STm->default_compression == ST_YES));
2455 #define MODE_HEADER_LENGTH 4
2457 /* Mode header and page byte offsets */
2458 #define MH_OFF_DATA_LENGTH 0
2459 #define MH_OFF_MEDIUM_TYPE 1
2460 #define MH_OFF_DEV_SPECIFIC 2
2461 #define MH_OFF_BDESCS_LENGTH 3
2462 #define MP_OFF_PAGE_NBR 0
2463 #define MP_OFF_PAGE_LENGTH 1
2465 /* Mode header and page bit masks */
2466 #define MH_BIT_WP 0x80
2467 #define MP_MSK_PAGE_NBR 0x3f
2469 /* Don't return block descriptors */
2470 #define MODE_SENSE_OMIT_BDESCS 0x08
2472 #define MODE_SELECT_PAGE_FORMAT 0x10
2474 /* Read a mode page into the tape buffer. The block descriptors are included
2475 if incl_block_descs is true. The page control is ored to the page number
2476 parameter, if necessary. */
2477 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2479 unsigned char cmd[MAX_COMMAND_SIZE];
2480 struct st_request *SRpnt;
2482 memset(cmd, 0, MAX_COMMAND_SIZE);
2483 cmd[0] = MODE_SENSE;
2484 if (omit_block_descs)
2485 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2490 STp->device->request_queue->rq_timeout, 0, 1);
2492 return (STp->buffer)->syscall_result;
2494 st_release_request(SRpnt);
2496 return STp->buffer->syscall_result;
2500 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2502 static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2505 unsigned char cmd[MAX_COMMAND_SIZE];
2506 struct st_request *SRpnt;
2509 memset(cmd, 0, MAX_COMMAND_SIZE);
2510 cmd[0] = MODE_SELECT;
2511 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2515 /* Clear reserved fields */
2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2522 STp->long_timeout : STp->device->request_queue->rq_timeout;
2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2526 return (STp->buffer)->syscall_result;
2528 st_release_request(SRpnt);
2530 return STp->buffer->syscall_result;
2534 #define COMPRESSION_PAGE 0x0f
2535 #define COMPRESSION_PAGE_LENGTH 16
2537 #define CP_OFF_DCE_DCC 2
2538 #define CP_OFF_C_ALGO 7
2540 #define DCE_MASK 0x80
2541 #define DCC_MASK 0x40
2542 #define RED_MASK 0x60
2545 /* Control the compression with mode page 15. Algorithm not changed if zero.
2547 The block descriptors are read and written because Sony SDT-7000 does not
2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2549 Including block descriptors should not cause any harm to other drives. */
2551 static int st_compression(struct scsi_tape * STp, int state)
2554 int mpoffs; /* Offset to mode page start */
2555 unsigned char *b_data = (STp->buffer)->b_data;
2557 if (STp->ready != ST_READY)
2560 /* Read the current page contents */
2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2563 DEBC_printk(STp, "Compression mode page not supported.\n");
2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
2568 DEBC_printk(STp, "Compression state is %d.\n",
2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
2571 /* Check if compression can be changed */
2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
2573 DEBC_printk(STp, "Compression not supported.\n");
2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2580 if (STp->c_algo != 0)
2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2585 if (STp->c_algo != 0)
2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2591 DEBC_printk(STp, "Compression change failed.\n");
2594 DEBC_printk(STp, "Compression state changed to %d.\n", state);
2596 STp->compression_changed = 1;
2601 /* Process the load and unload commands (does unload if the load code is zero) */
2602 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2604 int retval = (-EIO), timeout;
2605 unsigned char cmd[MAX_COMMAND_SIZE];
2606 struct st_partstat *STps;
2607 struct st_request *SRpnt;
2609 if (STp->ready != ST_READY && !load_code) {
2610 if (STp->ready == ST_NO_TAPE)
2611 return (-ENOMEDIUM);
2616 memset(cmd, 0, MAX_COMMAND_SIZE);
2617 cmd[0] = START_STOP;
2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2626 (cmd[4]) ? "" : "un",
2627 load_code - MT_ST_HPLOADER_OFFSET);
2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2630 if (STp->immediate) {
2631 cmd[1] = 1; /* Don't wait for completion */
2632 timeout = STp->device->request_queue->rq_timeout;
2635 timeout = STp->long_timeout;
2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2645 timeout, MAX_RETRIES, 1);
2647 return (STp->buffer)->syscall_result;
2649 retval = (STp->buffer)->syscall_result;
2650 st_release_request(SRpnt);
2652 if (!retval) { /* SCSI command successful */
2655 STp->rew_at_close = 0;
2656 STp->ready = ST_NO_TAPE;
2659 STp->rew_at_close = STp->autorew_dev;
2660 retval = check_tape(STp, filp);
2666 STps = &(STp->ps[STp->partition]);
2667 STps->drv_file = STps->drv_block = (-1);
2674 #define ST_DEB_FORWARD 0
2675 #define ST_DEB_BACKWARD 1
2676 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
2683 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2684 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
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(struct file *file, unsigned int cmd_in, unsigned long arg)
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;
3512 void __user *p = (void __user *)arg;
3514 if (mutex_lock_interruptible(&STp->lock))
3515 return -ERESTARTSYS;
3518 if (debugging && !STp->in_use) {
3519 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3524 STm = &(STp->modes[STp->current_mode]);
3525 STps = &(STp->ps[STp->partition]);
3528 * If we are in the middle of error recovery, don't let anyone
3529 * else try and use this device. Also, if error recovery fails, it
3530 * may try and take the device offline, in which case all further
3531 * access to the device is prohibited.
3533 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3534 file->f_flags & O_NDELAY);
3538 cmd_type = _IOC_TYPE(cmd_in);
3539 cmd_nr = _IOC_NR(cmd_in);
3541 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3544 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3549 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3555 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3556 st_printk(KERN_WARNING, STp,
3557 "MTSETDRVBUFFER only allowed for root.\n");
3561 if (!STm->defined &&
3562 (mtc.mt_op != MTSETDRVBUFFER &&
3563 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3568 if (!STp->pos_unknown) {
3570 if (STps->eof == ST_FM_HIT) {
3571 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3572 mtc.mt_op == MTEOM) {
3574 if (STps->drv_file >= 0)
3575 STps->drv_file += 1;
3576 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3578 if (STps->drv_file >= 0)
3579 STps->drv_file += 1;
3583 if (mtc.mt_op == MTSEEK) {
3584 /* Old position must be restored if partition will be
3586 i = !STp->can_partitions ||
3587 (STp->new_partition != STp->partition);
3589 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3590 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3591 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3592 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3593 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3594 mtc.mt_op == MTCOMPRESSION;
3596 i = flush_buffer(STp, i);
3601 if (STps->rw == ST_WRITING &&
3602 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3603 mtc.mt_op == MTSEEK ||
3604 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3605 i = st_int_ioctl(STp, MTWEOF, 1);
3610 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3617 * If there was a bus reset, block further access
3618 * to this device. If the user wants to rewind the tape,
3619 * then reset the flag and allow access again.
3621 if (mtc.mt_op != MTREW &&
3622 mtc.mt_op != MTOFFL &&
3623 mtc.mt_op != MTRETEN &&
3624 mtc.mt_op != MTERASE &&
3625 mtc.mt_op != MTSEEK &&
3626 mtc.mt_op != MTEOM) {
3631 /* remove this when the midlevel properly clears was_reset */
3632 STp->device->was_reset = 0;
3635 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3636 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3637 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3638 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3640 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3641 do_door_lock(STp, 0); /* Ignore result! */
3643 if (mtc.mt_op == MTSETDRVBUFFER &&
3644 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3645 retval = st_set_options(STp, mtc.mt_count);
3649 if (mtc.mt_op == MTSETPART) {
3650 if (!STp->can_partitions ||
3651 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3655 if (mtc.mt_count >= STp->nbr_partitions &&
3656 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3660 if (mtc.mt_count >= STp->nbr_partitions) {
3664 STp->new_partition = mtc.mt_count;
3669 if (mtc.mt_op == MTMKPART) {
3670 if (!STp->can_partitions) {
3674 i = do_load_unload(STp, file, 1);
3679 i = partition_tape(STp, mtc.mt_count);
3684 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3685 STp->ps[i].rw = ST_IDLE;
3686 STp->ps[i].at_sm = 0;
3687 STp->ps[i].last_block_valid = 0;
3689 STp->partition = STp->new_partition = 0;
3690 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3691 STps->drv_block = STps->drv_file = 0;
3696 if (mtc.mt_op == MTSEEK) {
3697 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3698 if (!STp->can_partitions)
3699 STp->ps[0].rw = ST_IDLE;
3704 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3705 retval = do_load_unload(STp, file, 0);
3709 if (mtc.mt_op == MTLOAD) {
3710 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3714 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3715 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3719 if (STp->can_partitions && STp->ready == ST_READY &&
3720 (i = switch_partition(STp)) < 0) {
3725 if (mtc.mt_op == MTCOMPRESSION)
3726 retval = st_compression(STp, (mtc.mt_count & 1));
3728 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3731 if (!STm->defined) {
3736 if ((i = flush_buffer(STp, 0)) < 0) {
3740 if (STp->can_partitions &&
3741 (i = switch_partition(STp)) < 0) {
3746 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3747 struct mtget mt_status;
3749 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3754 mt_status.mt_type = STp->tape_type;
3755 mt_status.mt_dsreg =
3756 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3757 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3758 mt_status.mt_blkno = STps->drv_block;
3759 mt_status.mt_fileno = STps->drv_file;
3760 if (STp->block_size != 0) {
3761 if (STps->rw == ST_WRITING)
3762 mt_status.mt_blkno +=
3763 (STp->buffer)->buffer_bytes / STp->block_size;
3764 else if (STps->rw == ST_READING)
3765 mt_status.mt_blkno -=
3766 ((STp->buffer)->buffer_bytes +
3767 STp->block_size - 1) / STp->block_size;
3770 mt_status.mt_gstat = 0;
3771 if (STp->drv_write_prot)
3772 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3773 if (mt_status.mt_blkno == 0) {
3774 if (mt_status.mt_fileno == 0)
3775 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3777 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3779 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3780 mt_status.mt_resid = STp->partition;
3781 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3782 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3783 else if (STps->eof >= ST_EOM_OK)
3784 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3785 if (STp->density == 1)
3786 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3787 else if (STp->density == 2)
3788 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3789 else if (STp->density == 3)
3790 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3791 if (STp->ready == ST_READY)
3792 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3793 if (STp->ready == ST_NO_TAPE)
3794 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3796 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3797 if (STm->do_async_writes ||
3798 (STm->do_buffer_writes && STp->block_size != 0) ||
3799 STp->drv_buffer != 0)
3800 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3801 if (STp->cleaning_req)
3802 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3804 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3810 STp->recover_reg = 0; /* Clear after read */
3813 } /* End of MTIOCGET */
3814 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3815 struct mtpos mt_pos;
3816 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3820 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3824 mt_pos.mt_blkno = blk;
3825 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3830 mutex_unlock(&STp->lock);
3832 case SCSI_IOCTL_GET_IDLUN:
3833 case SCSI_IOCTL_GET_BUS_NUMBER:
3836 if ((cmd_in == SG_IO ||
3837 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3838 cmd_in == CDROM_SEND_PACKET) &&
3839 !capable(CAP_SYS_RAWIO))
3842 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3843 file->f_mode, cmd_in, p);
3848 retval = scsi_ioctl(STp->device, cmd_in, p);
3849 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3850 STp->rew_at_close = 0;
3851 STp->ready = ST_NO_TAPE;
3856 mutex_unlock(&STp->lock);
3860 #ifdef CONFIG_COMPAT
3861 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3863 struct scsi_tape *STp = file->private_data;
3864 struct scsi_device *sdev = STp->device;
3865 int ret = -ENOIOCTLCMD;
3866 if (sdev->host->hostt->compat_ioctl) {
3868 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3877 /* Try to allocate a new tape buffer. Calling function must not hold
3879 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3881 struct st_buffer *tb;
3883 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3885 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3889 tb->use_sg = max_sg;
3891 tb->buffer_size = 0;
3893 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
3895 if (!tb->reserved_pages) {
3904 /* Try to allocate enough space in the tape buffer */
3905 #define ST_MAX_ORDER 6
3907 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3909 int segs, max_segs, b_size, order, got;
3912 if (new_size <= STbuffer->buffer_size)
3915 if (STbuffer->buffer_size <= PAGE_SIZE)
3916 normalize_buffer(STbuffer); /* Avoid extra segment */
3918 max_segs = STbuffer->use_sg;
3920 priority = GFP_KERNEL | __GFP_NOWARN;
3922 priority |= GFP_DMA;
3924 if (STbuffer->cleared)
3925 priority |= __GFP_ZERO;
3927 if (STbuffer->frp_segs) {
3928 order = STbuffer->reserved_page_order;
3929 b_size = PAGE_SIZE << order;
3931 for (b_size = PAGE_SIZE, order = 0;
3932 order < ST_MAX_ORDER &&
3933 max_segs * (PAGE_SIZE << order) < new_size;
3934 order++, b_size *= 2)
3936 STbuffer->reserved_page_order = order;
3938 if (max_segs * (PAGE_SIZE << order) < new_size) {
3939 if (order == ST_MAX_ORDER)
3941 normalize_buffer(STbuffer);
3942 return enlarge_buffer(STbuffer, new_size, need_dma);
3945 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3946 segs < max_segs && got < new_size;) {
3949 page = alloc_pages(priority, order);
3951 DEB(STbuffer->buffer_size = got);
3952 normalize_buffer(STbuffer);
3956 STbuffer->frp_segs += 1;
3958 STbuffer->buffer_size = got;
3959 STbuffer->reserved_pages[segs] = page;
3962 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3968 /* Make sure that no data from previous user is in the internal buffer */
3969 static void clear_buffer(struct st_buffer * st_bp)
3973 for (i=0; i < st_bp->frp_segs; i++)
3974 memset(page_address(st_bp->reserved_pages[i]), 0,
3975 PAGE_SIZE << st_bp->reserved_page_order);
3980 /* Release the extra buffer */
3981 static void normalize_buffer(struct st_buffer * STbuffer)
3983 int i, order = STbuffer->reserved_page_order;
3985 for (i = 0; i < STbuffer->frp_segs; i++) {
3986 __free_pages(STbuffer->reserved_pages[i], order);
3987 STbuffer->buffer_size -= (PAGE_SIZE << order);
3989 STbuffer->frp_segs = 0;
3990 STbuffer->sg_segs = 0;
3991 STbuffer->reserved_page_order = 0;
3992 STbuffer->map_data.offset = 0;
3996 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3997 negative error code. */
3998 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
4000 int i, cnt, res, offset;
4001 int length = PAGE_SIZE << st_bp->reserved_page_order;
4003 for (i = 0, offset = st_bp->buffer_bytes;
4004 i < st_bp->frp_segs && offset >= length; i++)
4006 if (i == st_bp->frp_segs) { /* Should never happen */
4007 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4010 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4011 struct page *page = st_bp->reserved_pages[i];
4012 cnt = length - offset < do_count ? length - offset : do_count;
4013 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4017 st_bp->buffer_bytes += cnt;
4021 if (do_count) /* Should never happen */
4028 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4029 negative error code. */
4030 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4032 int i, cnt, res, offset;
4033 int length = PAGE_SIZE << st_bp->reserved_page_order;
4035 for (i = 0, offset = st_bp->read_pointer;
4036 i < st_bp->frp_segs && offset >= length; i++)
4038 if (i == st_bp->frp_segs) { /* Should never happen */
4039 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4042 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4043 struct page *page = st_bp->reserved_pages[i];
4044 cnt = length - offset < do_count ? length - offset : do_count;
4045 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4049 st_bp->buffer_bytes -= cnt;
4050 st_bp->read_pointer += cnt;
4054 if (do_count) /* Should never happen */
4061 /* Move data towards start of buffer */
4062 static void move_buffer_data(struct st_buffer * st_bp, int offset)
4064 int src_seg, dst_seg, src_offset = 0, dst_offset;
4066 int length = PAGE_SIZE << st_bp->reserved_page_order;
4071 total=st_bp->buffer_bytes - offset;
4072 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4073 src_offset = offset;
4074 if (src_offset < length)
4079 st_bp->buffer_bytes = st_bp->read_pointer = total;
4080 for (dst_seg=dst_offset=0; total > 0; ) {
4081 struct page *dpage = st_bp->reserved_pages[dst_seg];
4082 struct page *spage = st_bp->reserved_pages[src_seg];
4084 count = min(length - dst_offset, length - src_offset);
4085 memmove(page_address(dpage) + dst_offset,
4086 page_address(spage) + src_offset, count);
4087 src_offset += count;
4088 if (src_offset >= length) {
4092 dst_offset += count;
4093 if (dst_offset >= length) {
4101 /* Validate the options from command line or module parameters */
4102 static void validate_options(void)
4105 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4106 if (max_sg_segs >= ST_FIRST_SG)
4107 st_max_sg_segs = max_sg_segs;
4111 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4113 static int __init st_setup(char *str)
4115 int i, len, ints[5];
4118 stp = get_options(str, ARRAY_SIZE(ints), ints);
4121 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4123 *parms[i].val = ints[i + 1];
4125 while (stp != NULL) {
4126 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4127 len = strlen(parms[i].name);
4128 if (!strncmp(stp, parms[i].name, len) &&
4129 (*(stp + len) == ':' || *(stp + len) == '=')) {
4132 simple_strtoul(stp + len + 1, NULL, 0);
4134 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4139 if (i >= ARRAY_SIZE(parms))
4140 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4142 stp = strchr(stp, ',');
4153 __setup("st=", st_setup);
4157 static const struct file_operations st_fops =
4159 .owner = THIS_MODULE,
4162 .unlocked_ioctl = st_ioctl,
4163 #ifdef CONFIG_COMPAT
4164 .compat_ioctl = st_compat_ioctl,
4168 .release = st_release,
4169 .llseek = noop_llseek,
4172 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4178 struct st_modedef *STm = &(tape->modes[mode]);
4180 int dev_num = tape->index;
4182 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4184 cdev = cdev_alloc();
4186 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4190 cdev->owner = THIS_MODULE;
4191 cdev->ops = &st_fops;
4192 STm->cdevs[rew] = cdev;
4194 error = cdev_add(cdev, cdev_devno, 1);
4196 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4197 rew ? "non" : "auto", mode);
4198 pr_err("st%d: Device not attached.\n", dev_num);
4202 i = mode << (4 - ST_NBR_MODE_BITS);
4203 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4204 tape->disk->disk_name, st_formats[i]);
4206 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4207 cdev_devno, &tape->modes[mode], "%s", name);
4209 pr_err("st%d: device_create failed\n", dev_num);
4210 error = PTR_ERR(dev);
4214 STm->devs[rew] = dev;
4218 cdev_del(STm->cdevs[rew]);
4220 STm->cdevs[rew] = NULL;
4221 STm->devs[rew] = NULL;
4225 static int create_cdevs(struct scsi_tape *tape)
4228 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4229 error = create_one_cdev(tape, mode, 0);
4232 error = create_one_cdev(tape, mode, 1);
4237 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4238 &tape->modes[0].devs[0]->kobj, "tape");
4241 static void remove_cdevs(struct scsi_tape *tape)
4244 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4245 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4246 struct st_modedef *STm = &(tape->modes[mode]);
4247 for (rew = 0; rew < 2; rew++) {
4248 if (STm->cdevs[rew])
4249 cdev_del(STm->cdevs[rew]);
4251 device_unregister(STm->devs[rew]);
4256 static int st_probe(struct device *dev)
4258 struct scsi_device *SDp = to_scsi_device(dev);
4259 struct gendisk *disk = NULL;
4260 struct scsi_tape *tpnt = NULL;
4261 struct st_modedef *STm;
4262 struct st_partstat *STps;
4263 struct st_buffer *buffer;
4267 if (SDp->type != TYPE_TAPE)
4269 if ((stp = st_incompatible(SDp))) {
4270 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4271 sdev_printk(KERN_INFO, SDp,
4272 "st: The suggested driver is %s.\n", stp);
4276 scsi_autopm_get_device(SDp);
4277 i = queue_max_segments(SDp->request_queue);
4278 if (st_max_sg_segs < i)
4280 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4281 if (buffer == NULL) {
4282 sdev_printk(KERN_ERR, SDp,
4283 "st: Can't allocate new tape buffer. "
4284 "Device not attached.\n");
4288 disk = alloc_disk(1);
4290 sdev_printk(KERN_ERR, SDp,
4291 "st: out of memory. Device not attached.\n");
4292 goto out_buffer_free;
4295 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4297 sdev_printk(KERN_ERR, SDp,
4298 "st: Can't allocate device descriptor.\n");
4301 kref_init(&tpnt->kref);
4303 disk->private_data = &tpnt->driver;
4304 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4305 * take queue reference that release_disk() expects. */
4306 if (!blk_get_queue(SDp->request_queue))
4308 disk->queue = SDp->request_queue;
4309 tpnt->driver = &st_template;
4312 if (SDp->scsi_level <= 2)
4313 tpnt->tape_type = MT_ISSCSI1;
4315 tpnt->tape_type = MT_ISSCSI2;
4317 tpnt->buffer = buffer;
4318 tpnt->buffer->last_SRpnt = NULL;
4323 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4324 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4325 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4327 tpnt->do_auto_lock = ST_AUTO_LOCK;
4328 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4329 tpnt->can_partitions = 0;
4330 tpnt->two_fm = ST_TWO_FM;
4331 tpnt->fast_mteom = ST_FAST_MTEOM;
4332 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4333 tpnt->sili = ST_SILI;
4334 tpnt->immediate = ST_NOWAIT;
4335 tpnt->immediate_filemark = 0;
4336 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4337 tpnt->partition = 0;
4338 tpnt->new_partition = 0;
4339 tpnt->nbr_partitions = 0;
4340 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4341 tpnt->long_timeout = ST_LONG_TIMEOUT;
4342 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4344 for (i = 0; i < ST_NBR_MODES; i++) {
4345 STm = &(tpnt->modes[i]);
4347 STm->sysv = ST_SYSV;
4348 STm->defaults_for_writes = 0;
4349 STm->do_async_writes = ST_ASYNC_WRITES;
4350 STm->do_buffer_writes = ST_BUFFER_WRITES;
4351 STm->do_read_ahead = ST_READ_AHEAD;
4352 STm->default_compression = ST_DONT_TOUCH;
4353 STm->default_blksize = (-1); /* No forced size */
4354 STm->default_density = (-1); /* No forced density */
4358 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4359 STps = &(tpnt->ps[i]);
4361 STps->eof = ST_NOEOF;
4363 STps->last_block_valid = 0;
4364 STps->drv_block = (-1);
4365 STps->drv_file = (-1);
4368 tpnt->current_mode = 0;
4369 tpnt->modes[0].defined = 1;
4371 tpnt->density_changed = tpnt->compression_changed =
4372 tpnt->blksize_changed = 0;
4373 mutex_init(&tpnt->lock);
4375 idr_preload(GFP_KERNEL);
4376 spin_lock(&st_index_lock);
4377 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4378 spin_unlock(&st_index_lock);
4381 pr_warn("st: idr allocation failed: %d\n", error);
4384 tpnt->index = error;
4385 sprintf(disk->disk_name, "st%d", tpnt->index);
4386 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4387 if (tpnt->stats == NULL) {
4388 sdev_printk(KERN_ERR, SDp,
4389 "st: Can't allocate statistics.\n");
4390 goto out_idr_remove;
4393 dev_set_drvdata(dev, tpnt);
4396 error = create_cdevs(tpnt);
4398 goto out_remove_devs;
4399 scsi_autopm_put_device(SDp);
4401 sdev_printk(KERN_NOTICE, SDp,
4402 "Attached scsi tape %s\n", tape_name(tpnt));
4403 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4404 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4405 queue_dma_alignment(SDp->request_queue) + 1);
4413 spin_lock(&st_index_lock);
4414 idr_remove(&st_index_idr, tpnt->index);
4415 spin_unlock(&st_index_lock);
4417 blk_put_queue(disk->queue);
4424 scsi_autopm_put_device(SDp);
4429 static int st_remove(struct device *dev)
4431 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4432 int index = tpnt->index;
4434 scsi_autopm_get_device(to_scsi_device(dev));
4437 mutex_lock(&st_ref_mutex);
4438 kref_put(&tpnt->kref, scsi_tape_release);
4439 mutex_unlock(&st_ref_mutex);
4440 spin_lock(&st_index_lock);
4441 idr_remove(&st_index_idr, index);
4442 spin_unlock(&st_index_lock);
4447 * scsi_tape_release - Called to free the Scsi_Tape structure
4448 * @kref: pointer to embedded kref
4450 * st_ref_mutex must be held entering this routine. Because it is
4451 * called on last put, you should always use the scsi_tape_get()
4452 * scsi_tape_put() helpers which manipulate the semaphore directly
4453 * and never do a direct kref_put().
4455 static void scsi_tape_release(struct kref *kref)
4457 struct scsi_tape *tpnt = to_scsi_tape(kref);
4458 struct gendisk *disk = tpnt->disk;
4460 tpnt->device = NULL;
4463 normalize_buffer(tpnt->buffer);
4464 kfree(tpnt->buffer->reserved_pages);
4465 kfree(tpnt->buffer);
4468 disk->private_data = NULL;
4475 static struct class st_sysfs_class = {
4476 .name = "scsi_tape",
4477 .dev_groups = st_dev_groups,
4480 static int __init init_st(void)
4486 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4487 verstr, st_fixed_buffer_size, st_max_sg_segs);
4489 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4491 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4495 err = class_register(&st_sysfs_class);
4497 pr_err("Unable register sysfs class for SCSI tapes\n");
4501 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4502 ST_MAX_TAPE_ENTRIES, "st");
4504 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4509 err = scsi_register_driver(&st_template.gendrv);
4516 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4517 ST_MAX_TAPE_ENTRIES);
4519 class_unregister(&st_sysfs_class);
4523 static void __exit exit_st(void)
4525 scsi_unregister_driver(&st_template.gendrv);
4526 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4527 ST_MAX_TAPE_ENTRIES);
4528 class_unregister(&st_sysfs_class);
4529 idr_destroy(&st_index_idr);
4530 printk(KERN_INFO "st: Unloaded.\n");
4533 module_init(init_st);
4534 module_exit(exit_st);
4537 /* The sysfs driver interface. Read-only at the moment */
4538 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4540 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4542 static DRIVER_ATTR_RO(try_direct_io);
4544 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4548 static DRIVER_ATTR_RO(fixed_buffer_size);
4550 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4552 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4554 static DRIVER_ATTR_RO(max_sg_segs);
4556 static ssize_t version_show(struct device_driver *ddd, char *buf)
4558 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4560 static DRIVER_ATTR_RO(version);
4563 static ssize_t debug_flag_store(struct device_driver *ddp,
4564 const char *buf, size_t count)
4566 /* We only care what the first byte of the data is the rest is unused.
4567 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4568 * other values have -EINVAL returned if they are passed in.
4571 if (buf[0] == '0') {
4572 debugging = NO_DEBUG;
4574 } else if (buf[0] == '1') {
4582 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4584 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4586 static DRIVER_ATTR_RW(debug_flag);
4589 static struct attribute *st_drv_attrs[] = {
4590 &driver_attr_try_direct_io.attr,
4591 &driver_attr_fixed_buffer_size.attr,
4592 &driver_attr_max_sg_segs.attr,
4593 &driver_attr_version.attr,
4595 &driver_attr_debug_flag.attr,
4599 ATTRIBUTE_GROUPS(st_drv);
4601 /* The sysfs simple class interface */
4603 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4605 struct st_modedef *STm = dev_get_drvdata(dev);
4608 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4611 static DEVICE_ATTR_RO(defined);
4614 default_blksize_show(struct device *dev, struct device_attribute *attr,
4617 struct st_modedef *STm = dev_get_drvdata(dev);
4620 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4623 static DEVICE_ATTR_RO(default_blksize);
4626 default_density_show(struct device *dev, struct device_attribute *attr,
4629 struct st_modedef *STm = dev_get_drvdata(dev);
4633 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4634 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4637 static DEVICE_ATTR_RO(default_density);
4640 default_compression_show(struct device *dev, struct device_attribute *attr,
4643 struct st_modedef *STm = dev_get_drvdata(dev);
4646 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4649 static DEVICE_ATTR_RO(default_compression);
4652 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4654 struct st_modedef *STm = dev_get_drvdata(dev);
4655 struct scsi_tape *STp = STm->tape;
4659 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4660 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4661 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4662 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4663 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4664 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4665 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4666 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4667 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4668 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4669 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4670 options |= STm->sysv ? MT_ST_SYSV : 0;
4671 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4672 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4673 options |= STp->sili ? MT_ST_SILI : 0;
4675 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4678 static DEVICE_ATTR_RO(options);
4680 /* Support for tape stats */
4683 * read_cnt_show - return read count - count of reads made from tape drive
4684 * @dev: struct device
4685 * @attr: attribute structure
4686 * @buf: buffer to return formatted data in
4688 static ssize_t read_cnt_show(struct device *dev,
4689 struct device_attribute *attr, char *buf)
4691 struct st_modedef *STm = dev_get_drvdata(dev);
4693 return sprintf(buf, "%lld",
4694 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4696 static DEVICE_ATTR_RO(read_cnt);
4699 * read_byte_cnt_show - return read byte count - tape drives
4700 * may use blocks less than 512 bytes this gives the raw byte count of
4701 * of data read from the tape drive.
4702 * @dev: struct device
4703 * @attr: attribute structure
4704 * @buf: buffer to return formatted data in
4706 static ssize_t read_byte_cnt_show(struct device *dev,
4707 struct device_attribute *attr, char *buf)
4709 struct st_modedef *STm = dev_get_drvdata(dev);
4711 return sprintf(buf, "%lld",
4712 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4714 static DEVICE_ATTR_RO(read_byte_cnt);
4717 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4718 * @dev: struct device
4719 * @attr: attribute structure
4720 * @buf: buffer to return formatted data in
4722 static ssize_t read_ns_show(struct device *dev,
4723 struct device_attribute *attr, char *buf)
4725 struct st_modedef *STm = dev_get_drvdata(dev);
4727 return sprintf(buf, "%lld",
4728 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4730 static DEVICE_ATTR_RO(read_ns);
4733 * write_cnt_show - write count - number of user calls
4734 * to write(2) that have written data to tape.
4735 * @dev: struct device
4736 * @attr: attribute structure
4737 * @buf: buffer to return formatted data in
4739 static ssize_t write_cnt_show(struct device *dev,
4740 struct device_attribute *attr, char *buf)
4742 struct st_modedef *STm = dev_get_drvdata(dev);
4744 return sprintf(buf, "%lld",
4745 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4747 static DEVICE_ATTR_RO(write_cnt);
4750 * write_byte_cnt_show - write byte count - raw count of
4751 * bytes written to tape.
4752 * @dev: struct device
4753 * @attr: attribute structure
4754 * @buf: buffer to return formatted data in
4756 static ssize_t write_byte_cnt_show(struct device *dev,
4757 struct device_attribute *attr, char *buf)
4759 struct st_modedef *STm = dev_get_drvdata(dev);
4761 return sprintf(buf, "%lld",
4762 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4764 static DEVICE_ATTR_RO(write_byte_cnt);
4767 * write_ns_show - write ns - number of nanoseconds waiting on write
4768 * requests to complete.
4769 * @dev: struct device
4770 * @attr: attribute structure
4771 * @buf: buffer to return formatted data in
4773 static ssize_t write_ns_show(struct device *dev,
4774 struct device_attribute *attr, char *buf)
4776 struct st_modedef *STm = dev_get_drvdata(dev);
4778 return sprintf(buf, "%lld",
4779 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4781 static DEVICE_ATTR_RO(write_ns);
4784 * in_flight_show - number of I/Os currently in flight -
4785 * in most cases this will be either 0 or 1. It may be higher if someone
4786 * has also issued other SCSI commands such as via an ioctl.
4787 * @dev: struct device
4788 * @attr: attribute structure
4789 * @buf: buffer to return formatted data in
4791 static ssize_t in_flight_show(struct device *dev,
4792 struct device_attribute *attr, char *buf)
4794 struct st_modedef *STm = dev_get_drvdata(dev);
4796 return sprintf(buf, "%lld",
4797 (long long)atomic64_read(&STm->tape->stats->in_flight));
4799 static DEVICE_ATTR_RO(in_flight);
4802 * io_ns_show - io wait ns - this is the number of ns spent
4803 * waiting on all I/O to complete. This includes tape movement commands
4804 * such as rewinding, seeking to end of file or tape, it also includes
4805 * read and write. To determine the time spent on tape movement
4806 * subtract the read and write ns from this value.
4807 * @dev: struct device
4808 * @attr: attribute structure
4809 * @buf: buffer to return formatted data in
4811 static ssize_t io_ns_show(struct device *dev,
4812 struct device_attribute *attr, char *buf)
4814 struct st_modedef *STm = dev_get_drvdata(dev);
4816 return sprintf(buf, "%lld",
4817 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4819 static DEVICE_ATTR_RO(io_ns);
4822 * other_cnt_show - other io count - this is the number of
4823 * I/O requests other than read and write requests.
4824 * Typically these are tape movement requests but will include driver
4825 * tape movement. This includes only requests issued by the st driver.
4826 * @dev: struct device
4827 * @attr: attribute structure
4828 * @buf: buffer to return formatted data in
4830 static ssize_t other_cnt_show(struct device *dev,
4831 struct device_attribute *attr, char *buf)
4833 struct st_modedef *STm = dev_get_drvdata(dev);
4835 return sprintf(buf, "%lld",
4836 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4838 static DEVICE_ATTR_RO(other_cnt);
4841 * resid_cnt_show - A count of the number of times we get a residual
4842 * count - this should indicate someone issuing reads larger than the
4843 * block size on tape.
4844 * @dev: struct device
4845 * @attr: attribute structure
4846 * @buf: buffer to return formatted data in
4848 static ssize_t resid_cnt_show(struct device *dev,
4849 struct device_attribute *attr, char *buf)
4851 struct st_modedef *STm = dev_get_drvdata(dev);
4853 return sprintf(buf, "%lld",
4854 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4856 static DEVICE_ATTR_RO(resid_cnt);
4858 static struct attribute *st_dev_attrs[] = {
4859 &dev_attr_defined.attr,
4860 &dev_attr_default_blksize.attr,
4861 &dev_attr_default_density.attr,
4862 &dev_attr_default_compression.attr,
4863 &dev_attr_options.attr,
4867 static struct attribute *st_stats_attrs[] = {
4868 &dev_attr_read_cnt.attr,
4869 &dev_attr_read_byte_cnt.attr,
4870 &dev_attr_read_ns.attr,
4871 &dev_attr_write_cnt.attr,
4872 &dev_attr_write_byte_cnt.attr,
4873 &dev_attr_write_ns.attr,
4874 &dev_attr_in_flight.attr,
4875 &dev_attr_io_ns.attr,
4876 &dev_attr_other_cnt.attr,
4877 &dev_attr_resid_cnt.attr,
4881 static struct attribute_group stats_group = {
4883 .attrs = st_stats_attrs,
4886 static struct attribute_group st_group = {
4887 .attrs = st_dev_attrs,
4890 static const struct attribute_group *st_dev_groups[] = {
4896 /* The following functions may be useful for a larger audience. */
4897 static int sgl_map_user_pages(struct st_buffer *STbp,
4898 const unsigned int max_pages, unsigned long uaddr,
4899 size_t count, int rw)
4901 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4902 unsigned long start = uaddr >> PAGE_SHIFT;
4903 const int nr_pages = end - start;
4905 struct page **pages;
4906 struct rq_map_data *mdata = &STbp->map_data;
4908 /* User attempted Overflow! */
4909 if ((uaddr + count) < uaddr)
4913 if (nr_pages > max_pages)
4920 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
4924 /* Try to fault in all of the necessary pages */
4925 /* rw==READ means read from drive, write into memory area */
4926 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0,
4929 /* Errors and no page mapped should return here */
4933 for (i=0; i < nr_pages; i++) {
4934 /* FIXME: flush superflous for rw==READ,
4935 * probably wrong function for rw==WRITE
4937 flush_dcache_page(pages[i]);
4940 mdata->offset = uaddr & ~PAGE_MASK;
4941 STbp->mapped_pages = pages;
4946 for (j=0; j < res; j++)
4955 /* And unmap them... */
4956 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4957 const unsigned int nr_pages, int dirtied)
4961 for (i=0; i < nr_pages; i++) {
4962 struct page *page = STbp->mapped_pages[i];
4966 /* FIXME: cache flush missing for rw==READ
4967 * FIXME: call the correct reference counting function
4971 kfree(STbp->mapped_pages);
4972 STbp->mapped_pages = NULL;