2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
12 Copyright 1992 - 2016 Kai Makisara
13 email Kai.Makisara@kolumbus.fi
15 Some small formal changes - aeb, 950809
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
20 static const char *verstr = "20160209";
22 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/sched/signal.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/mtio.h>
33 #include <linux/cdrom.h>
34 #include <linux/ioctl.h>
35 #include <linux/fcntl.h>
36 #include <linux/spinlock.h>
37 #include <linux/blkdev.h>
38 #include <linux/moduleparam.h>
39 #include <linux/cdev.h>
40 #include <linux/idr.h>
41 #include <linux/delay.h>
42 #include <linux/mutex.h>
44 #include <linux/uaccess.h>
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_dbg.h>
49 #include <scsi/scsi_device.h>
50 #include <scsi/scsi_driver.h>
51 #include <scsi/scsi_eh.h>
52 #include <scsi/scsi_host.h>
53 #include <scsi/scsi_ioctl.h>
57 /* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
62 #define ST_DEB_MSG KERN_NOTICE
64 /* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
68 #define DEBC(a) if (debugging) { a ; }
74 #define ST_KILOBYTE 1024
76 #include "st_options.h"
79 static int buffer_kbs;
80 static int max_sg_segs;
81 static int try_direct_io = TRY_DIRECT_IO;
82 static int try_rdio = 1;
83 static int try_wdio = 1;
84 static int debug_flag;
86 static struct class st_sysfs_class;
87 static const struct attribute_group *st_dev_groups[];
88 static const struct attribute_group *st_drv_groups[];
90 MODULE_AUTHOR("Kai Makisara");
91 MODULE_DESCRIPTION("SCSI tape (st) driver");
92 MODULE_LICENSE("GPL");
93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
100 module_param_named(buffer_kbs, buffer_kbs, int, 0);
101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102 module_param_named(max_sg_segs, max_sg_segs, int, 0);
103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104 module_param_named(try_direct_io, try_direct_io, int, 0);
105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
106 module_param_named(debug_flag, debug_flag, int, 0);
107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
110 /* Extra parameters for testing */
111 module_param_named(try_rdio, try_rdio, int, 0);
112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113 module_param_named(try_wdio, try_wdio, int, 0);
114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
117 static int write_threshold_kbs; /* retained for compatibility */
118 static struct st_dev_parm {
121 } parms[] __initdata = {
123 "buffer_kbs", &buffer_kbs
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
132 "try_direct_io", &try_direct_io
135 "debug_flag", &debug_flag
140 /* Restrict the number of modes so that names for all are assigned */
141 #if ST_NBR_MODES > 16
142 #error "Maximum number of modes is 16"
144 /* Bit reversed order to get same names for same minors with all
146 static const char *st_formats[] = {
147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
150 /* The default definitions have been moved to st_options.h */
152 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
154 /* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157 #error "Buffer size should not exceed (2 << 24 - 1) bytes!"
160 static int debugging = DEBUG;
162 #define MAX_RETRIES 0
163 #define MAX_WRITE_RETRIES 0
164 #define MAX_READY_RETRIES 0
165 #define NO_TAPE NOT_READY
167 #define ST_TIMEOUT (900 * HZ)
168 #define ST_LONG_TIMEOUT (14000 * HZ)
170 /* Remove mode bits and auto-rewind bit (7) */
171 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
175 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
179 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
181 #define SET_DENS_AND_BLK 0x10001
183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184 static int st_max_sg_segs = ST_MAX_SG;
186 static int modes_defined;
188 static int enlarge_buffer(struct st_buffer *, int, int);
189 static void clear_buffer(struct st_buffer *);
190 static void normalize_buffer(struct st_buffer *);
191 static int append_to_buffer(const char __user *, struct st_buffer *, int);
192 static int from_buffer(struct st_buffer *, char __user *, int);
193 static void move_buffer_data(struct st_buffer *, int);
195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
196 unsigned long, size_t, int);
197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
199 static int st_probe(struct device *);
200 static int st_remove(struct device *);
202 static struct scsi_driver st_template = {
205 .owner = THIS_MODULE,
208 .groups = st_drv_groups,
212 static int st_compression(struct scsi_tape *, int);
214 static int find_partition(struct scsi_tape *);
215 static int switch_partition(struct scsi_tape *);
217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
219 static void scsi_tape_release(struct kref *);
221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
223 static DEFINE_MUTEX(st_ref_mutex);
224 static DEFINE_SPINLOCK(st_index_lock);
225 static DEFINE_SPINLOCK(st_use_lock);
226 static DEFINE_IDR(st_index_idr);
230 #include "osst_detect.h"
231 #ifndef SIGS_FROM_OSST
232 #define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
240 static struct scsi_tape *scsi_tape_get(int dev)
242 struct scsi_tape *STp = NULL;
244 mutex_lock(&st_ref_mutex);
245 spin_lock(&st_index_lock);
247 STp = idr_find(&st_index_idr, dev);
250 kref_get(&STp->kref);
255 if (scsi_device_get(STp->device))
261 kref_put(&STp->kref, scsi_tape_release);
264 spin_unlock(&st_index_lock);
265 mutex_unlock(&st_ref_mutex);
269 static void scsi_tape_put(struct scsi_tape *STp)
271 struct scsi_device *sdev = STp->device;
273 mutex_lock(&st_ref_mutex);
274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
276 mutex_unlock(&st_ref_mutex);
279 struct st_reject_data {
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
286 static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
291 /* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293 static char * st_incompatible(struct scsi_device* SDp)
295 struct st_reject_data *rp;
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
302 return rp->driver_hint;
310 static inline char *tape_name(struct scsi_tape *tape)
312 return tape->disk->disk_name;
315 #define st_printk(prefix, t, fmt, a...) \
316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
318 #define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
321 #define DEBC_printk(t, fmt, a...)
324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
327 const u8 *sense = SRpnt->sense;
329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
342 s->flags = sense[2] & 0xe0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
356 /* Convert the result to success code */
357 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
359 int result = SRpnt->result;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
368 cmdstatp = &STp->buffer->cmdstat;
369 st_analyze_sense(SRpnt, cmdstatp);
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
382 if (cmdstatp->have_sense)
383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
391 else if (cmdstatp->have_sense &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
409 STp->cln_sense_mask) == STp->cln_sense_value);
411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
412 STp->cln_sense_mask) != 0);
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
418 STp->pos_unknown |= STp->device->was_reset;
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422 #if ST_RECOVERED_WRITE_FATAL
423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
427 STp->recover_count++;
432 if (SRpnt->cmd[0] == READ_6)
434 else if (SRpnt->cmd[0] == WRITE_6)
438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
443 if (cmdstatp->flags == 0)
449 static struct st_request *st_allocate_request(struct scsi_tape *stp)
451 struct st_request *streq;
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
462 stp->buffer->syscall_result = -EBUSY;
468 static void st_release_request(struct st_request *streq)
473 static void st_do_stats(struct scsi_tape *STp, struct request *req)
478 if (scsi_req(req)->cmd[0] == WRITE_6) {
479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
483 if (scsi_req(req)->result) {
484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
492 } else if (scsi_req(req)->cmd[0] == READ_6) {
493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
497 if (scsi_req(req)->result) {
498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
511 atomic64_dec(&STp->stats->in_flight);
514 static void st_scsi_execute_end(struct request *req, blk_status_t status)
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_request *rq = scsi_req(req);
518 struct scsi_tape *STp = SRpnt->stp;
521 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
522 STp->buffer->cmdstat.residual = rq->resid_len;
524 st_do_stats(STp, req);
528 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
530 complete(SRpnt->waiting);
532 blk_rq_unmap_user(tmp);
533 __blk_put_request(req->q, req);
536 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
537 int data_direction, void *buffer, unsigned bufflen,
538 int timeout, int retries)
541 struct scsi_request *rq;
542 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
544 struct scsi_tape *STp = SRpnt->stp;
546 req = blk_get_request(SRpnt->stp->device->request_queue,
547 data_direction == DMA_TO_DEVICE ?
548 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
550 return DRIVER_ERROR << 24;
552 req->rq_flags |= RQF_QUIET;
554 mdata->null_mapped = 1;
557 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
560 blk_put_request(req);
561 return DRIVER_ERROR << 24;
565 atomic64_inc(&STp->stats->in_flight);
566 if (cmd[0] == WRITE_6) {
567 atomic_set(&STp->stats->last_write_size, bufflen);
568 STp->stats->write_time = ktime_get();
569 } else if (cmd[0] == READ_6) {
570 atomic_set(&STp->stats->last_read_size, bufflen);
571 STp->stats->read_time = ktime_get();
573 STp->stats->other_time = ktime_get();
576 SRpnt->bio = req->bio;
577 rq->cmd_len = COMMAND_SIZE(cmd[0]);
578 memset(rq->cmd, 0, BLK_MAX_CDB);
579 memcpy(rq->cmd, cmd, rq->cmd_len);
580 req->timeout = timeout;
581 rq->retries = retries;
582 req->end_io_data = SRpnt;
584 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
588 /* Do the scsi command. Waits until command performed if do_wait is true.
589 Otherwise write_behind_check() is used to check that the command
591 static struct st_request *
592 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
593 int bytes, int direction, int timeout, int retries, int do_wait)
595 struct completion *waiting;
596 struct rq_map_data *mdata = &STp->buffer->map_data;
599 /* if async, make sure there's no command outstanding */
600 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
601 st_printk(KERN_ERR, STp,
602 "Async command already active.\n");
603 if (signal_pending(current))
604 (STp->buffer)->syscall_result = (-EINTR);
606 (STp->buffer)->syscall_result = (-EBUSY);
611 SRpnt = st_allocate_request(STp);
616 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
617 which IO is outstanding. It's nulled out when the IO completes. */
619 (STp->buffer)->last_SRpnt = SRpnt;
621 waiting = &STp->wait;
622 init_completion(waiting);
623 SRpnt->waiting = waiting;
625 if (STp->buffer->do_dio) {
626 mdata->page_order = 0;
627 mdata->nr_entries = STp->buffer->sg_segs;
628 mdata->pages = STp->buffer->mapped_pages;
630 mdata->page_order = STp->buffer->reserved_page_order;
632 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
633 mdata->pages = STp->buffer->reserved_pages;
637 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
638 STp->buffer->cmdstat.have_sense = 0;
639 STp->buffer->syscall_result = 0;
641 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
644 /* could not allocate the buffer or request was too large */
645 (STp->buffer)->syscall_result = (-EBUSY);
646 (STp->buffer)->last_SRpnt = NULL;
647 } else if (do_wait) {
648 wait_for_completion(waiting);
649 SRpnt->waiting = NULL;
650 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
657 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
658 write has been correct but EOM early warning reached, -EIO if write ended in
659 error or zero if write successful. Asynchronous writes are used only in
660 variable block mode. */
661 static int write_behind_check(struct scsi_tape * STp)
664 struct st_buffer *STbuffer;
665 struct st_partstat *STps;
666 struct st_cmdstatus *cmdstatp;
667 struct st_request *SRpnt;
669 STbuffer = STp->buffer;
670 if (!STbuffer->writing)
674 if (STp->write_pending)
680 wait_for_completion(&(STp->wait));
681 SRpnt = STbuffer->last_SRpnt;
682 STbuffer->last_SRpnt = NULL;
683 SRpnt->waiting = NULL;
685 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
686 st_release_request(SRpnt);
688 STbuffer->buffer_bytes -= STbuffer->writing;
689 STps = &(STp->ps[STp->partition]);
690 if (STps->drv_block >= 0) {
691 if (STp->block_size == 0)
694 STps->drv_block += STbuffer->writing / STp->block_size;
697 cmdstatp = &STbuffer->cmdstat;
698 if (STbuffer->syscall_result) {
700 if (cmdstatp->have_sense && !cmdstatp->deferred &&
701 (cmdstatp->flags & SENSE_EOM) &&
702 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
703 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
704 /* EOM at write-behind, has all data been written? */
705 if (!cmdstatp->remainder_valid ||
706 cmdstatp->uremainder64 == 0)
710 STps->drv_block = -1;
712 STbuffer->writing = 0;
714 DEB(if (debugging && retval)
715 st_printk(ST_DEB_MSG, STp,
716 "Async write error %x, return value %d.\n",
717 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
723 /* Step over EOF if it has been inadvertently crossed (ioctl not used because
724 it messes up the block number). */
725 static int cross_eof(struct scsi_tape * STp, int forward)
727 struct st_request *SRpnt;
728 unsigned char cmd[MAX_COMMAND_SIZE];
731 cmd[1] = 0x01; /* Space FileMarks */
736 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
739 DEBC_printk(STp, "Stepping over filemark %s.\n",
740 forward ? "forward" : "backward");
742 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
743 STp->device->request_queue->rq_timeout,
746 return (STp->buffer)->syscall_result;
748 st_release_request(SRpnt);
751 if ((STp->buffer)->cmdstat.midlevel_result != 0)
752 st_printk(KERN_ERR, STp,
753 "Stepping over filemark %s failed.\n",
754 forward ? "forward" : "backward");
756 return (STp->buffer)->syscall_result;
760 /* Flush the write buffer (never need to write if variable blocksize). */
761 static int st_flush_write_buffer(struct scsi_tape * STp)
765 unsigned char cmd[MAX_COMMAND_SIZE];
766 struct st_request *SRpnt;
767 struct st_partstat *STps;
769 result = write_behind_check(STp);
774 if (STp->dirty == 1) {
776 transfer = STp->buffer->buffer_bytes;
777 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
779 memset(cmd, 0, MAX_COMMAND_SIZE);
782 blks = transfer / STp->block_size;
787 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
788 STp->device->request_queue->rq_timeout,
789 MAX_WRITE_RETRIES, 1);
791 return (STp->buffer)->syscall_result;
793 STps = &(STp->ps[STp->partition]);
794 if ((STp->buffer)->syscall_result != 0) {
795 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
797 if (cmdstatp->have_sense && !cmdstatp->deferred &&
798 (cmdstatp->flags & SENSE_EOM) &&
799 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
800 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
801 (!cmdstatp->remainder_valid ||
802 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
804 (STp->buffer)->buffer_bytes = 0;
805 if (STps->drv_block >= 0)
806 STps->drv_block += blks;
809 st_printk(KERN_ERR, STp, "Error on flush.\n");
810 STps->drv_block = (-1);
814 if (STps->drv_block >= 0)
815 STps->drv_block += blks;
817 (STp->buffer)->buffer_bytes = 0;
819 st_release_request(SRpnt);
826 /* Flush the tape buffer. The tape will be positioned correctly unless
827 seek_next is true. */
828 static int flush_buffer(struct scsi_tape *STp, int seek_next)
830 int backspace, result;
831 struct st_buffer *STbuffer;
832 struct st_partstat *STps;
834 STbuffer = STp->buffer;
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 */
2729 cmd[1] = 0x01; /* Space FileMarks */
2730 cmd[2] = (arg >> 16);
2731 cmd[3] = (arg >> 8);
2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
2737 at_sm &= (arg == 0);
2740 chg_eof = 0; /* Changed from the FSF after this */
2743 cmd[1] = 0x01; /* Space FileMarks */
2745 cmd[2] = (ltmp >> 16);
2746 cmd[3] = (ltmp >> 8);
2748 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
2751 blkno = (-1); /* We can't know the block number */
2752 at_sm &= (arg == 0);
2756 cmd[1] = 0x00; /* Space Blocks */
2757 cmd[2] = (arg >> 16);
2758 cmd[3] = (arg >> 8);
2760 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
2763 at_sm &= (arg == 0);
2767 cmd[1] = 0x00; /* Space Blocks */
2769 cmd[2] = (ltmp >> 16);
2770 cmd[3] = (ltmp >> 8);
2772 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
2775 at_sm &= (arg == 0);
2779 cmd[1] = 0x04; /* Space Setmarks */
2780 cmd[2] = (arg >> 16);
2781 cmd[3] = (arg >> 8);
2783 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
2785 blkno = fileno = (-1);
2791 cmd[1] = 0x04; /* Space Setmarks */
2793 cmd[2] = (ltmp >> 16);
2794 cmd[3] = (ltmp >> 8);
2796 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
2798 blkno = fileno = (-1);
2805 if (STp->write_prot)
2807 cmd[0] = WRITE_FILEMARKS;
2808 if (cmd_in == MTWSM)
2810 if (cmd_in == MTWEOFI ||
2811 (cmd_in == MTWEOF && STp->immediate_filemark))
2813 cmd[2] = (arg >> 16);
2814 cmd[3] = (arg >> 8);
2816 timeout = STp->device->request_queue->rq_timeout;
2818 if (cmd_in != MTWSM)
2819 st_printk(ST_DEB_MSG, STp,
2820 "Writing %d filemarks.\n",
2825 st_printk(ST_DEB_MSG, STp,
2826 "Writing %d setmarks.\n",
2834 at_sm = (cmd_in == MTWSM);
2837 cmd[0] = REZERO_UNIT;
2838 if (STp->immediate) {
2839 cmd[1] = 1; /* Don't wait for completion */
2840 timeout = STp->device->request_queue->rq_timeout;
2842 DEBC_printk(STp, "Rewinding tape.\n");
2843 fileno = blkno = at_sm = 0;
2846 DEBC_printk(STp, "No op on tape.\n");
2847 return 0; /* Should do something ? */
2850 cmd[0] = START_STOP;
2851 if (STp->immediate) {
2852 cmd[1] = 1; /* Don't wait for completion */
2853 timeout = STp->device->request_queue->rq_timeout;
2856 DEBC_printk(STp, "Retensioning tape.\n");
2857 fileno = blkno = at_sm = 0;
2860 if (!STp->fast_mteom) {
2861 /* space to the end of tape */
2862 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2863 fileno = STps->drv_file;
2864 if (STps->eof >= ST_EOD_1)
2866 /* The next lines would hide the number of spaced FileMarks
2867 That's why I inserted the previous lines. I had no luck
2868 with detecting EOM with FSF, so we go now to EOM.
2874 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
2879 if (STp->write_prot)
2882 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2883 if (STp->immediate) {
2884 cmd[1] |= 2; /* Don't wait for completion */
2885 timeout = STp->device->request_queue->rq_timeout;
2888 timeout = STp->long_timeout * 8;
2890 DEBC_printk(STp, "Erasing tape.\n");
2891 fileno = blkno = at_sm = 0;
2893 case MTSETBLK: /* Set block length */
2894 case MTSETDENSITY: /* Set tape density */
2895 case MTSETDRVBUFFER: /* Set drive buffering */
2896 case SET_DENS_AND_BLK: /* Set density and block size */
2898 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2899 return (-EIO); /* Not allowed if data in buffer */
2900 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2901 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2902 STp->max_block > 0 &&
2903 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2904 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
2905 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
2908 cmd[0] = MODE_SELECT;
2909 if ((STp->use_pf & USE_PF))
2910 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2911 cmd[4] = datalen = 12;
2912 direction = DMA_TO_DEVICE;
2914 memset((STp->buffer)->b_data, 0, 12);
2915 if (cmd_in == MTSETDRVBUFFER)
2916 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2918 (STp->buffer)->b_data[2] =
2919 STp->drv_buffer << 4;
2920 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2921 if (cmd_in == MTSETDENSITY) {
2922 (STp->buffer)->b_data[4] = arg;
2923 STp->density_changed = 1; /* At least we tried ;-) */
2924 } else if (cmd_in == SET_DENS_AND_BLK)
2925 (STp->buffer)->b_data[4] = arg >> 24;
2927 (STp->buffer)->b_data[4] = STp->density;
2928 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2929 ltmp = arg & MT_ST_BLKSIZE_MASK;
2930 if (cmd_in == MTSETBLK)
2931 STp->blksize_changed = 1; /* At least we tried ;-) */
2933 ltmp = STp->block_size;
2934 (STp->buffer)->b_data[9] = (ltmp >> 16);
2935 (STp->buffer)->b_data[10] = (ltmp >> 8);
2936 (STp->buffer)->b_data[11] = ltmp;
2937 timeout = STp->device->request_queue->rq_timeout;
2939 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
2940 st_printk(ST_DEB_MSG, STp,
2941 "Setting block size to %d bytes.\n",
2942 (STp->buffer)->b_data[9] * 65536 +
2943 (STp->buffer)->b_data[10] * 256 +
2944 (STp->buffer)->b_data[11]);
2945 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
2946 st_printk(ST_DEB_MSG, STp,
2947 "Setting density code to %x.\n",
2948 (STp->buffer)->b_data[4]);
2949 if (cmd_in == MTSETDRVBUFFER)
2950 st_printk(ST_DEB_MSG, STp,
2951 "Setting drive buffer code to %d.\n",
2952 ((STp->buffer)->b_data[2] >> 4) & 7);
2959 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2960 timeout, MAX_RETRIES, 1);
2962 return (STp->buffer)->syscall_result;
2964 ioctl_result = (STp->buffer)->syscall_result;
2966 if (!ioctl_result) { /* SCSI command successful */
2967 st_release_request(SRpnt);
2969 STps->drv_block = blkno;
2970 STps->drv_file = fileno;
2971 STps->at_sm = at_sm;
2973 if (cmd_in == MTBSFM)
2974 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2975 else if (cmd_in == MTFSFM)
2976 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2978 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2979 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2980 if (STp->block_size != 0) {
2981 (STp->buffer)->buffer_blocks =
2982 (STp->buffer)->buffer_size / STp->block_size;
2984 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2985 if (cmd_in == SET_DENS_AND_BLK)
2986 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2987 } else if (cmd_in == MTSETDRVBUFFER)
2988 STp->drv_buffer = (arg & 7);
2989 else if (cmd_in == MTSETDENSITY)
2992 if (cmd_in == MTEOM)
2994 else if (cmd_in == MTFSF)
2997 STps->eof = ST_NOEOF;
2999 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
3000 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
3001 } else { /* SCSI command was not completely successful. Don't return
3002 from this block without releasing the SCSI command block! */
3003 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3005 if (cmdstatp->flags & SENSE_EOM) {
3006 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3007 cmd_in != MTBSR && cmd_in != MTBSS)
3008 STps->eof = ST_EOM_OK;
3009 STps->drv_block = 0;
3012 if (cmdstatp->remainder_valid)
3013 undone = (int)cmdstatp->uremainder64;
3017 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
3018 cmdstatp->have_sense &&
3019 (cmdstatp->flags & SENSE_EOM)) {
3020 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3021 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3022 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3023 STps->eof = ST_NOEOF;
3024 } else { /* Writing EOF(s) failed */
3028 STps->eof = ST_NOEOF;
3030 STps->drv_file = fileno;
3031 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3033 STps->drv_file = fileno - undone;
3035 STps->drv_file = fileno;
3036 STps->drv_block = -1;
3037 STps->eof = ST_NOEOF;
3038 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3039 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3041 if (STps->drv_file >= 0)
3042 STps->drv_file = fileno + undone;
3043 STps->drv_block = 0;
3044 STps->eof = ST_NOEOF;
3045 } else if (cmd_in == MTFSR) {
3046 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3047 if (STps->drv_file >= 0)
3049 STps->drv_block = 0;
3052 if (blkno >= undone)
3053 STps->drv_block = blkno - undone;
3055 STps->drv_block = (-1);
3056 STps->eof = ST_NOEOF;
3058 } else if (cmd_in == MTBSR) {
3059 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3061 STps->drv_block = (-1);
3063 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3065 if (STps->drv_block >= 0)
3066 STps->drv_block = blkno + undone;
3068 STps->eof = ST_NOEOF;
3069 } else if (cmd_in == MTEOM) {
3070 STps->drv_file = (-1);
3071 STps->drv_block = (-1);
3073 } else if (cmd_in == MTSETBLK ||
3074 cmd_in == MTSETDENSITY ||
3075 cmd_in == MTSETDRVBUFFER ||
3076 cmd_in == SET_DENS_AND_BLK) {
3077 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3078 !(STp->use_pf & PF_TESTED)) {
3079 /* Try the other possible state of Page Format if not
3081 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
3082 st_release_request(SRpnt);
3084 return st_int_ioctl(STp, cmd_in, arg);
3087 STps->eof = ST_NOEOF;
3089 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3092 st_release_request(SRpnt);
3096 return ioctl_result;
3100 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3103 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3107 unsigned char scmd[MAX_COMMAND_SIZE];
3108 struct st_request *SRpnt;
3110 if (STp->ready != ST_READY)
3113 memset(scmd, 0, MAX_COMMAND_SIZE);
3114 if ((STp->device)->scsi_level < SCSI_2) {
3115 scmd[0] = QFA_REQUEST_BLOCK;
3118 scmd[0] = READ_POSITION;
3119 if (!logical && !STp->scsi2_logical)
3122 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3123 STp->device->request_queue->rq_timeout,
3124 MAX_READY_RETRIES, 1);
3126 return (STp->buffer)->syscall_result;
3128 if ((STp->buffer)->syscall_result != 0 ||
3129 (STp->device->scsi_level >= SCSI_2 &&
3130 ((STp->buffer)->b_data[0] & 4) != 0)) {
3131 *block = *partition = 0;
3132 DEBC_printk(STp, " Can't read tape position.\n");
3136 if ((STp->device)->scsi_level < SCSI_2) {
3137 *block = ((STp->buffer)->b_data[0] << 16)
3138 + ((STp->buffer)->b_data[1] << 8)
3139 + (STp->buffer)->b_data[2];
3142 *block = ((STp->buffer)->b_data[4] << 24)
3143 + ((STp->buffer)->b_data[5] << 16)
3144 + ((STp->buffer)->b_data[6] << 8)
3145 + (STp->buffer)->b_data[7];
3146 *partition = (STp->buffer)->b_data[1];
3147 if (((STp->buffer)->b_data[0] & 0x80) &&
3148 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3149 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3151 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3152 *block, *partition);
3154 st_release_request(SRpnt);
3161 /* Set the tape block and partition. Negative partition means that only the
3162 block should be set in vendor specific way. */
3163 static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3166 struct st_partstat *STps;
3170 unsigned char scmd[MAX_COMMAND_SIZE];
3171 struct st_request *SRpnt;
3173 if (STp->ready != ST_READY)
3175 timeout = STp->long_timeout;
3176 STps = &(STp->ps[STp->partition]);
3178 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3180 DEB(if (partition < 0)
3183 /* Update the location at the partition we are leaving */
3184 if ((!STp->can_partitions && partition != 0) ||
3185 partition >= ST_NBR_PARTITIONS)
3187 if (partition != STp->partition) {
3188 if (get_location(STp, &blk, &p, 1))
3189 STps->last_block_valid = 0;
3191 STps->last_block_valid = 1;
3192 STps->last_block_visited = blk;
3193 DEBC_printk(STp, "Visited block %d for "
3194 "partition %d saved.\n",
3195 blk, STp->partition);
3199 memset(scmd, 0, MAX_COMMAND_SIZE);
3200 if ((STp->device)->scsi_level < SCSI_2) {
3201 scmd[0] = QFA_SEEK_BLOCK;
3202 scmd[2] = (block >> 16);
3203 scmd[3] = (block >> 8);
3208 scmd[3] = (block >> 24);
3209 scmd[4] = (block >> 16);
3210 scmd[5] = (block >> 8);
3212 if (!logical && !STp->scsi2_logical)
3214 if (STp->partition != partition) {
3216 scmd[8] = partition;
3217 DEBC_printk(STp, "Trying to change partition "
3218 "from %d to %d\n", STp->partition,
3222 if (STp->immediate) {
3223 scmd[1] |= 1; /* Don't wait for completion */
3224 timeout = STp->device->request_queue->rq_timeout;
3227 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3228 timeout, MAX_READY_RETRIES, 1);
3230 return (STp->buffer)->syscall_result;
3232 STps->drv_block = STps->drv_file = (-1);
3233 STps->eof = ST_NOEOF;
3234 if ((STp->buffer)->syscall_result != 0) {
3236 if (STp->can_partitions &&
3237 (STp->device)->scsi_level >= SCSI_2 &&
3238 (p = find_partition(STp)) >= 0)
3241 if (STp->can_partitions) {
3242 STp->partition = partition;
3243 STps = &(STp->ps[partition]);
3244 if (!STps->last_block_valid ||
3245 STps->last_block_visited != block) {
3252 STps->drv_block = STps->drv_file = 0;
3256 st_release_request(SRpnt);
3263 /* Find the current partition number for the drive status. Called from open and
3264 returns either partition number of negative error code. */
3265 static int find_partition(struct scsi_tape *STp)
3270 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3272 if (partition >= ST_NBR_PARTITIONS)
3278 /* Change the partition if necessary */
3279 static int switch_partition(struct scsi_tape *STp)
3281 struct st_partstat *STps;
3283 if (STp->partition == STp->new_partition)
3285 STps = &(STp->ps[STp->new_partition]);
3286 if (!STps->last_block_valid)
3287 STps->last_block_visited = 0;
3288 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3291 /* Functions for reading and writing the medium partition mode page. */
3293 #define PART_PAGE 0x11
3294 #define PART_PAGE_FIXED_LENGTH 8
3296 #define PP_OFF_MAX_ADD_PARTS 2
3297 #define PP_OFF_NBR_ADD_PARTS 3
3298 #define PP_OFF_FLAGS 4
3299 #define PP_OFF_PART_UNITS 6
3300 #define PP_OFF_RESERVED 7
3302 #define PP_BIT_IDP 0x20
3303 #define PP_BIT_FDP 0x80
3304 #define PP_MSK_PSUM_MB 0x10
3305 #define PP_MSK_PSUM_UNITS 0x18
3306 #define PP_MSK_POFM 0x04
3308 /* Get the number of partitions on the tape. As a side effect reads the
3309 mode page into the tape buffer. */
3310 static int nbr_partitions(struct scsi_tape *STp)
3314 if (STp->ready != ST_READY)
3317 result = read_mode_page(STp, PART_PAGE, 1);
3320 DEBC_printk(STp, "Can't read medium partition page.\n");
3323 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3324 PP_OFF_NBR_ADD_PARTS] + 1;
3325 DEBC_printk(STp, "Number of partitions %d.\n", result);
3332 static int format_medium(struct scsi_tape *STp, int format)
3335 int timeout = STp->long_timeout;
3336 unsigned char scmd[MAX_COMMAND_SIZE];
3337 struct st_request *SRpnt;
3339 memset(scmd, 0, MAX_COMMAND_SIZE);
3340 scmd[0] = FORMAT_UNIT;
3342 if (STp->immediate) {
3343 scmd[1] |= 1; /* Don't wait for completion */
3344 timeout = STp->device->request_queue->rq_timeout;
3346 DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
3347 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3348 timeout, MAX_RETRIES, 1);
3350 result = STp->buffer->syscall_result;
3355 /* Partition the tape into two partitions if size > 0 or one partition if
3358 The block descriptors are read and written because Sony SDT-7000 does not
3359 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3361 My HP C1533A drive returns only one partition size field. This is used to
3362 set the size of partition 1. There is no size field for the default partition.
3363 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3364 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3365 The following algorithm is used to accommodate both drives: if the number of
3366 partition size fields is greater than the maximum number of additional partitions
3367 in the mode page, the second field is used. Otherwise the first field is used.
3369 For Seagate DDS drives the page length must be 8 when no partitions is defined
3370 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3371 is acceptable also to some other old drives and enforced if the first partition
3372 size field is used for the first additional partition size.
3374 For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
3376 static int partition_tape(struct scsi_tape *STp, int size)
3379 int target_partition;
3380 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
3381 int pgo, psd_cnt, psdo;
3382 int psum = PP_MSK_PSUM_MB, units = 0;
3385 result = read_mode_page(STp, PART_PAGE, 0);
3387 DEBC_printk(STp, "Can't read partition mode page.\n");
3390 target_partition = 1;
3392 target_partition = 0;
3396 /* The mode page is in the buffer. Let's modify it and write it. */
3397 bp = (STp->buffer)->b_data;
3398 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
3399 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3400 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
3402 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3405 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
3406 if (needs_format && size == 0) {
3407 /* No need to write the mode page when clearing
3410 DEBC_printk(STp, "Formatting tape with one partition.\n");
3411 result = format_medium(STp, 0);
3414 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
3416 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
3417 /* Use units scaling for large partitions if the device
3418 * suggests it and no precision lost. Required for IBM
3419 * TS1140/50 drives that don't support MB units.
3421 if (size >= 1000 && (size % 1000) == 0) {
3423 psum = PP_MSK_PSUM_UNITS;
3427 /* Try it anyway if too large to specify in MB */
3428 if (psum == PP_MSK_PSUM_MB && size >= 65534) {
3430 psum = PP_MSK_PSUM_UNITS;
3435 if (size >= 65535 || /* Does not fit into two bytes */
3436 (target_partition == 0 && psd_cnt < 2)) {
3441 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3442 /* The second condition is for HP DDS which use only one partition size
3445 if (target_partition > 0 &&
3446 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
3447 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
3448 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
3451 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3453 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
3454 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
3455 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
3458 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3459 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3460 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
3461 DEBC_printk(STp, "Formatting tape with one partition.\n");
3463 bp[psdo] = (size >> 8) & 0xff;
3464 bp[psdo + 1] = size & 0xff;
3465 if (target_partition == 0)
3466 bp[psdo + 2] = bp[psdo + 3] = 0xff;
3468 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3469 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
3471 "Formatting tape with two partitions (%i = %d MB).\n",
3472 target_partition, units > 0 ? size * 1000 : size);
3474 bp[pgo + PP_OFF_PART_UNITS] = 0;
3475 bp[pgo + PP_OFF_RESERVED] = 0;
3476 if (size != 1 || units != 0) {
3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
3478 (bp[pgo + PP_OFF_FLAGS] & 0x07);
3479 bp[pgo + PP_OFF_PART_UNITS] = units;
3481 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
3482 (bp[pgo + PP_OFF_FLAGS] & 0x1f);
3483 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
3485 result = write_mode_page(STp, PART_PAGE, 1);
3487 if (!result && needs_format)
3488 result = format_medium(STp, 1);
3491 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
3501 /* The ioctl command */
3502 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
3504 int i, cmd_nr, cmd_type, bt;
3507 struct scsi_tape *STp = file->private_data;
3508 struct st_modedef *STm;
3509 struct st_partstat *STps;
3510 void __user *p = (void __user *)arg;
3512 if (mutex_lock_interruptible(&STp->lock))
3513 return -ERESTARTSYS;
3516 if (debugging && !STp->in_use) {
3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
3522 STm = &(STp->modes[STp->current_mode]);
3523 STps = &(STp->ps[STp->partition]);
3526 * If we are in the middle of error recovery, don't let anyone
3527 * else try and use this device. Also, if error recovery fails, it
3528 * may try and take the device offline, in which case all further
3529 * access to the device is prohibited.
3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3532 file->f_flags & O_NDELAY);
3536 cmd_type = _IOC_TYPE(cmd_in);
3537 cmd_nr = _IOC_NR(cmd_in);
3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3547 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
3554 st_printk(KERN_WARNING, STp,
3555 "MTSETDRVBUFFER only allowed for root.\n");
3559 if (!STm->defined &&
3560 (mtc.mt_op != MTSETDRVBUFFER &&
3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3566 if (!STp->pos_unknown) {
3568 if (STps->eof == ST_FM_HIT) {
3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3570 mtc.mt_op == MTEOM) {
3572 if (STps->drv_file >= 0)
3573 STps->drv_file += 1;
3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3576 if (STps->drv_file >= 0)
3577 STps->drv_file += 1;
3581 if (mtc.mt_op == MTSEEK) {
3582 /* Old position must be restored if partition will be
3584 i = !STp->can_partitions ||
3585 (STp->new_partition != STp->partition);
3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3592 mtc.mt_op == MTCOMPRESSION;
3594 i = flush_buffer(STp, i);
3599 if (STps->rw == ST_WRITING &&
3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3601 mtc.mt_op == MTSEEK ||
3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3603 i = st_int_ioctl(STp, MTWEOF, 1);
3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3615 * If there was a bus reset, block further access
3616 * to this device. If the user wants to rewind the tape,
3617 * then reset the flag and allow access again.
3619 if (mtc.mt_op != MTREW &&
3620 mtc.mt_op != MTOFFL &&
3621 mtc.mt_op != MTRETEN &&
3622 mtc.mt_op != MTERASE &&
3623 mtc.mt_op != MTSEEK &&
3624 mtc.mt_op != MTEOM) {
3629 /* remove this when the midlevel properly clears was_reset */
3630 STp->device->was_reset = 0;
3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3639 do_door_lock(STp, 0); /* Ignore result! */
3641 if (mtc.mt_op == MTSETDRVBUFFER &&
3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3643 retval = st_set_options(STp, mtc.mt_count);
3647 if (mtc.mt_op == MTSETPART) {
3648 if (!STp->can_partitions ||
3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3653 if (mtc.mt_count >= STp->nbr_partitions &&
3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3658 if (mtc.mt_count >= STp->nbr_partitions) {
3662 STp->new_partition = mtc.mt_count;
3667 if (mtc.mt_op == MTMKPART) {
3668 if (!STp->can_partitions) {
3672 i = do_load_unload(STp, file, 1);
3677 i = partition_tape(STp, mtc.mt_count);
3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3683 STp->ps[i].rw = ST_IDLE;
3684 STp->ps[i].at_sm = 0;
3685 STp->ps[i].last_block_valid = 0;
3687 STp->partition = STp->new_partition = 0;
3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
3689 STps->drv_block = STps->drv_file = 0;
3694 if (mtc.mt_op == MTSEEK) {
3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3696 if (!STp->can_partitions)
3697 STp->ps[0].rw = ST_IDLE;
3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3703 retval = do_load_unload(STp, file, 0);
3707 if (mtc.mt_op == MTLOAD) {
3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3717 if (STp->can_partitions && STp->ready == ST_READY &&
3718 (i = switch_partition(STp)) < 0) {
3723 if (mtc.mt_op == MTCOMPRESSION)
3724 retval = st_compression(STp, (mtc.mt_count & 1));
3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3729 if (!STm->defined) {
3734 if ((i = flush_buffer(STp, 0)) < 0) {
3738 if (STp->can_partitions &&
3739 (i = switch_partition(STp)) < 0) {
3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3745 struct mtget mt_status;
3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3752 mt_status.mt_type = STp->tape_type;
3753 mt_status.mt_dsreg =
3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3756 mt_status.mt_blkno = STps->drv_block;
3757 mt_status.mt_fileno = STps->drv_file;
3758 if (STp->block_size != 0) {
3759 if (STps->rw == ST_WRITING)
3760 mt_status.mt_blkno +=
3761 (STp->buffer)->buffer_bytes / STp->block_size;
3762 else if (STps->rw == ST_READING)
3763 mt_status.mt_blkno -=
3764 ((STp->buffer)->buffer_bytes +
3765 STp->block_size - 1) / STp->block_size;
3768 mt_status.mt_gstat = 0;
3769 if (STp->drv_write_prot)
3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3771 if (mt_status.mt_blkno == 0) {
3772 if (mt_status.mt_fileno == 0)
3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3778 mt_status.mt_resid = STp->partition;
3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3781 else if (STps->eof >= ST_EOM_OK)
3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3783 if (STp->density == 1)
3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3785 else if (STp->density == 2)
3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3787 else if (STp->density == 3)
3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3789 if (STp->ready == ST_READY)
3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3791 if (STp->ready == ST_NO_TAPE)
3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3794 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3795 if (STm->do_async_writes ||
3796 (STm->do_buffer_writes && STp->block_size != 0) ||
3797 STp->drv_buffer != 0)
3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3799 if (STp->cleaning_req)
3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3802 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3808 STp->recover_reg = 0; /* Clear after read */
3811 } /* End of MTIOCGET */
3812 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3813 struct mtpos mt_pos;
3814 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3818 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3822 mt_pos.mt_blkno = blk;
3823 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3828 mutex_unlock(&STp->lock);
3830 case SCSI_IOCTL_GET_IDLUN:
3831 case SCSI_IOCTL_GET_BUS_NUMBER:
3834 if ((cmd_in == SG_IO ||
3835 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3836 cmd_in == CDROM_SEND_PACKET) &&
3837 !capable(CAP_SYS_RAWIO))
3840 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3841 file->f_mode, cmd_in, p);
3846 retval = scsi_ioctl(STp->device, cmd_in, p);
3847 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3848 STp->rew_at_close = 0;
3849 STp->ready = ST_NO_TAPE;
3854 mutex_unlock(&STp->lock);
3858 #ifdef CONFIG_COMPAT
3859 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3861 struct scsi_tape *STp = file->private_data;
3862 struct scsi_device *sdev = STp->device;
3863 int ret = -ENOIOCTLCMD;
3864 if (sdev->host->hostt->compat_ioctl) {
3866 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3875 /* Try to allocate a new tape buffer. Calling function must not hold
3877 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
3879 struct st_buffer *tb;
3881 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
3883 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3887 tb->use_sg = max_sg;
3889 tb->buffer_size = 0;
3891 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3893 if (!tb->reserved_pages) {
3902 /* Try to allocate enough space in the tape buffer */
3903 #define ST_MAX_ORDER 6
3905 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3907 int segs, max_segs, b_size, order, got;
3910 if (new_size <= STbuffer->buffer_size)
3913 if (STbuffer->buffer_size <= PAGE_SIZE)
3914 normalize_buffer(STbuffer); /* Avoid extra segment */
3916 max_segs = STbuffer->use_sg;
3918 priority = GFP_KERNEL | __GFP_NOWARN;
3920 priority |= GFP_DMA;
3922 if (STbuffer->cleared)
3923 priority |= __GFP_ZERO;
3925 if (STbuffer->frp_segs) {
3926 order = STbuffer->reserved_page_order;
3927 b_size = PAGE_SIZE << order;
3929 for (b_size = PAGE_SIZE, order = 0;
3930 order < ST_MAX_ORDER &&
3931 max_segs * (PAGE_SIZE << order) < new_size;
3932 order++, b_size *= 2)
3934 STbuffer->reserved_page_order = order;
3936 if (max_segs * (PAGE_SIZE << order) < new_size) {
3937 if (order == ST_MAX_ORDER)
3939 normalize_buffer(STbuffer);
3940 return enlarge_buffer(STbuffer, new_size, need_dma);
3943 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3944 segs < max_segs && got < new_size;) {
3947 page = alloc_pages(priority, order);
3949 DEB(STbuffer->buffer_size = got);
3950 normalize_buffer(STbuffer);
3954 STbuffer->frp_segs += 1;
3956 STbuffer->buffer_size = got;
3957 STbuffer->reserved_pages[segs] = page;
3960 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
3966 /* Make sure that no data from previous user is in the internal buffer */
3967 static void clear_buffer(struct st_buffer * st_bp)
3971 for (i=0; i < st_bp->frp_segs; i++)
3972 memset(page_address(st_bp->reserved_pages[i]), 0,
3973 PAGE_SIZE << st_bp->reserved_page_order);
3978 /* Release the extra buffer */
3979 static void normalize_buffer(struct st_buffer * STbuffer)
3981 int i, order = STbuffer->reserved_page_order;
3983 for (i = 0; i < STbuffer->frp_segs; i++) {
3984 __free_pages(STbuffer->reserved_pages[i], order);
3985 STbuffer->buffer_size -= (PAGE_SIZE << order);
3987 STbuffer->frp_segs = 0;
3988 STbuffer->sg_segs = 0;
3989 STbuffer->reserved_page_order = 0;
3990 STbuffer->map_data.offset = 0;
3994 /* Move data from the user buffer to the tape buffer. Returns zero (success) or
3995 negative error code. */
3996 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3998 int i, cnt, res, offset;
3999 int length = PAGE_SIZE << st_bp->reserved_page_order;
4001 for (i = 0, offset = st_bp->buffer_bytes;
4002 i < st_bp->frp_segs && offset >= length; i++)
4004 if (i == st_bp->frp_segs) { /* Should never happen */
4005 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
4008 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4009 struct page *page = st_bp->reserved_pages[i];
4010 cnt = length - offset < do_count ? length - offset : do_count;
4011 res = copy_from_user(page_address(page) + offset, ubp, cnt);
4015 st_bp->buffer_bytes += cnt;
4019 if (do_count) /* Should never happen */
4026 /* Move data from the tape buffer to the user buffer. Returns zero (success) or
4027 negative error code. */
4028 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
4030 int i, cnt, res, offset;
4031 int length = PAGE_SIZE << st_bp->reserved_page_order;
4033 for (i = 0, offset = st_bp->read_pointer;
4034 i < st_bp->frp_segs && offset >= length; i++)
4036 if (i == st_bp->frp_segs) { /* Should never happen */
4037 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
4040 for (; i < st_bp->frp_segs && do_count > 0; i++) {
4041 struct page *page = st_bp->reserved_pages[i];
4042 cnt = length - offset < do_count ? length - offset : do_count;
4043 res = copy_to_user(ubp, page_address(page) + offset, cnt);
4047 st_bp->buffer_bytes -= cnt;
4048 st_bp->read_pointer += cnt;
4052 if (do_count) /* Should never happen */
4059 /* Move data towards start of buffer */
4060 static void move_buffer_data(struct st_buffer * st_bp, int offset)
4062 int src_seg, dst_seg, src_offset = 0, dst_offset;
4064 int length = PAGE_SIZE << st_bp->reserved_page_order;
4069 total=st_bp->buffer_bytes - offset;
4070 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
4071 src_offset = offset;
4072 if (src_offset < length)
4077 st_bp->buffer_bytes = st_bp->read_pointer = total;
4078 for (dst_seg=dst_offset=0; total > 0; ) {
4079 struct page *dpage = st_bp->reserved_pages[dst_seg];
4080 struct page *spage = st_bp->reserved_pages[src_seg];
4082 count = min(length - dst_offset, length - src_offset);
4083 memmove(page_address(dpage) + dst_offset,
4084 page_address(spage) + src_offset, count);
4085 src_offset += count;
4086 if (src_offset >= length) {
4090 dst_offset += count;
4091 if (dst_offset >= length) {
4099 /* Validate the options from command line or module parameters */
4100 static void validate_options(void)
4103 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4104 if (max_sg_segs >= ST_FIRST_SG)
4105 st_max_sg_segs = max_sg_segs;
4109 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4111 static int __init st_setup(char *str)
4113 int i, len, ints[5];
4116 stp = get_options(str, ARRAY_SIZE(ints), ints);
4119 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4121 *parms[i].val = ints[i + 1];
4123 while (stp != NULL) {
4124 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4125 len = strlen(parms[i].name);
4126 if (!strncmp(stp, parms[i].name, len) &&
4127 (*(stp + len) == ':' || *(stp + len) == '=')) {
4130 simple_strtoul(stp + len + 1, NULL, 0);
4132 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4137 if (i >= ARRAY_SIZE(parms))
4138 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4140 stp = strchr(stp, ',');
4151 __setup("st=", st_setup);
4155 static const struct file_operations st_fops =
4157 .owner = THIS_MODULE,
4160 .unlocked_ioctl = st_ioctl,
4161 #ifdef CONFIG_COMPAT
4162 .compat_ioctl = st_compat_ioctl,
4166 .release = st_release,
4167 .llseek = noop_llseek,
4170 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4176 struct st_modedef *STm = &(tape->modes[mode]);
4178 int dev_num = tape->index;
4180 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4182 cdev = cdev_alloc();
4184 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4188 cdev->owner = THIS_MODULE;
4189 cdev->ops = &st_fops;
4190 STm->cdevs[rew] = cdev;
4192 error = cdev_add(cdev, cdev_devno, 1);
4194 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4195 rew ? "non" : "auto", mode);
4196 pr_err("st%d: Device not attached.\n", dev_num);
4200 i = mode << (4 - ST_NBR_MODE_BITS);
4201 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4202 tape->disk->disk_name, st_formats[i]);
4204 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4205 cdev_devno, &tape->modes[mode], "%s", name);
4207 pr_err("st%d: device_create failed\n", dev_num);
4208 error = PTR_ERR(dev);
4212 STm->devs[rew] = dev;
4216 cdev_del(STm->cdevs[rew]);
4218 STm->cdevs[rew] = NULL;
4219 STm->devs[rew] = NULL;
4223 static int create_cdevs(struct scsi_tape *tape)
4226 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4227 error = create_one_cdev(tape, mode, 0);
4230 error = create_one_cdev(tape, mode, 1);
4235 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4236 &tape->modes[0].devs[0]->kobj, "tape");
4239 static void remove_cdevs(struct scsi_tape *tape)
4242 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4243 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4244 struct st_modedef *STm = &(tape->modes[mode]);
4245 for (rew = 0; rew < 2; rew++) {
4246 if (STm->cdevs[rew])
4247 cdev_del(STm->cdevs[rew]);
4249 device_unregister(STm->devs[rew]);
4254 static int st_probe(struct device *dev)
4256 struct scsi_device *SDp = to_scsi_device(dev);
4257 struct gendisk *disk = NULL;
4258 struct scsi_tape *tpnt = NULL;
4259 struct st_modedef *STm;
4260 struct st_partstat *STps;
4261 struct st_buffer *buffer;
4265 if (SDp->type != TYPE_TAPE)
4267 if ((stp = st_incompatible(SDp))) {
4268 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
4269 sdev_printk(KERN_INFO, SDp,
4270 "st: The suggested driver is %s.\n", stp);
4274 scsi_autopm_get_device(SDp);
4275 i = queue_max_segments(SDp->request_queue);
4276 if (st_max_sg_segs < i)
4278 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
4279 if (buffer == NULL) {
4280 sdev_printk(KERN_ERR, SDp,
4281 "st: Can't allocate new tape buffer. "
4282 "Device not attached.\n");
4286 disk = alloc_disk(1);
4288 sdev_printk(KERN_ERR, SDp,
4289 "st: out of memory. Device not attached.\n");
4290 goto out_buffer_free;
4293 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
4295 sdev_printk(KERN_ERR, SDp,
4296 "st: Can't allocate device descriptor.\n");
4299 kref_init(&tpnt->kref);
4301 disk->private_data = &tpnt->driver;
4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4303 * take queue reference that release_disk() expects. */
4304 if (!blk_get_queue(SDp->request_queue))
4306 disk->queue = SDp->request_queue;
4307 tpnt->driver = &st_template;
4310 if (SDp->scsi_level <= 2)
4311 tpnt->tape_type = MT_ISSCSI1;
4313 tpnt->tape_type = MT_ISSCSI2;
4315 tpnt->buffer = buffer;
4316 tpnt->buffer->last_SRpnt = NULL;
4321 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4322 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4323 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4325 tpnt->do_auto_lock = ST_AUTO_LOCK;
4326 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4327 tpnt->can_partitions = 0;
4328 tpnt->two_fm = ST_TWO_FM;
4329 tpnt->fast_mteom = ST_FAST_MTEOM;
4330 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
4331 tpnt->sili = ST_SILI;
4332 tpnt->immediate = ST_NOWAIT;
4333 tpnt->immediate_filemark = 0;
4334 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4335 tpnt->partition = 0;
4336 tpnt->new_partition = 0;
4337 tpnt->nbr_partitions = 0;
4338 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
4339 tpnt->long_timeout = ST_LONG_TIMEOUT;
4340 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4342 for (i = 0; i < ST_NBR_MODES; i++) {
4343 STm = &(tpnt->modes[i]);
4345 STm->sysv = ST_SYSV;
4346 STm->defaults_for_writes = 0;
4347 STm->do_async_writes = ST_ASYNC_WRITES;
4348 STm->do_buffer_writes = ST_BUFFER_WRITES;
4349 STm->do_read_ahead = ST_READ_AHEAD;
4350 STm->default_compression = ST_DONT_TOUCH;
4351 STm->default_blksize = (-1); /* No forced size */
4352 STm->default_density = (-1); /* No forced density */
4356 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4357 STps = &(tpnt->ps[i]);
4359 STps->eof = ST_NOEOF;
4361 STps->last_block_valid = 0;
4362 STps->drv_block = (-1);
4363 STps->drv_file = (-1);
4366 tpnt->current_mode = 0;
4367 tpnt->modes[0].defined = 1;
4369 tpnt->density_changed = tpnt->compression_changed =
4370 tpnt->blksize_changed = 0;
4371 mutex_init(&tpnt->lock);
4373 idr_preload(GFP_KERNEL);
4374 spin_lock(&st_index_lock);
4375 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
4376 spin_unlock(&st_index_lock);
4379 pr_warn("st: idr allocation failed: %d\n", error);
4382 tpnt->index = error;
4383 sprintf(disk->disk_name, "st%d", tpnt->index);
4384 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4385 if (tpnt->stats == NULL) {
4386 sdev_printk(KERN_ERR, SDp,
4387 "st: Can't allocate statistics.\n");
4388 goto out_idr_remove;
4391 dev_set_drvdata(dev, tpnt);
4394 error = create_cdevs(tpnt);
4396 goto out_remove_devs;
4397 scsi_autopm_put_device(SDp);
4399 sdev_printk(KERN_NOTICE, SDp,
4400 "Attached scsi tape %s\n", tape_name(tpnt));
4401 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4402 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4403 queue_dma_alignment(SDp->request_queue) + 1);
4411 spin_lock(&st_index_lock);
4412 idr_remove(&st_index_idr, tpnt->index);
4413 spin_unlock(&st_index_lock);
4415 blk_put_queue(disk->queue);
4422 scsi_autopm_put_device(SDp);
4427 static int st_remove(struct device *dev)
4429 struct scsi_tape *tpnt = dev_get_drvdata(dev);
4430 int index = tpnt->index;
4432 scsi_autopm_get_device(to_scsi_device(dev));
4435 mutex_lock(&st_ref_mutex);
4436 kref_put(&tpnt->kref, scsi_tape_release);
4437 mutex_unlock(&st_ref_mutex);
4438 spin_lock(&st_index_lock);
4439 idr_remove(&st_index_idr, index);
4440 spin_unlock(&st_index_lock);
4445 * scsi_tape_release - Called to free the Scsi_Tape structure
4446 * @kref: pointer to embedded kref
4448 * st_ref_mutex must be held entering this routine. Because it is
4449 * called on last put, you should always use the scsi_tape_get()
4450 * scsi_tape_put() helpers which manipulate the semaphore directly
4451 * and never do a direct kref_put().
4453 static void scsi_tape_release(struct kref *kref)
4455 struct scsi_tape *tpnt = to_scsi_tape(kref);
4456 struct gendisk *disk = tpnt->disk;
4458 tpnt->device = NULL;
4461 normalize_buffer(tpnt->buffer);
4462 kfree(tpnt->buffer->reserved_pages);
4463 kfree(tpnt->buffer);
4466 disk->private_data = NULL;
4473 static struct class st_sysfs_class = {
4474 .name = "scsi_tape",
4475 .dev_groups = st_dev_groups,
4478 static int __init init_st(void)
4484 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
4485 verstr, st_fixed_buffer_size, st_max_sg_segs);
4487 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4489 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4493 err = class_register(&st_sysfs_class);
4495 pr_err("Unable register sysfs class for SCSI tapes\n");
4499 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4500 ST_MAX_TAPE_ENTRIES, "st");
4502 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4507 err = scsi_register_driver(&st_template.gendrv);
4514 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4515 ST_MAX_TAPE_ENTRIES);
4517 class_unregister(&st_sysfs_class);
4521 static void __exit exit_st(void)
4523 scsi_unregister_driver(&st_template.gendrv);
4524 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4525 ST_MAX_TAPE_ENTRIES);
4526 class_unregister(&st_sysfs_class);
4527 idr_destroy(&st_index_idr);
4528 printk(KERN_INFO "st: Unloaded.\n");
4531 module_init(init_st);
4532 module_exit(exit_st);
4535 /* The sysfs driver interface. Read-only at the moment */
4536 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
4538 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
4540 static DRIVER_ATTR_RO(try_direct_io);
4542 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
4544 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
4546 static DRIVER_ATTR_RO(fixed_buffer_size);
4548 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
4550 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
4552 static DRIVER_ATTR_RO(max_sg_segs);
4554 static ssize_t version_show(struct device_driver *ddd, char *buf)
4556 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
4558 static DRIVER_ATTR_RO(version);
4561 static ssize_t debug_flag_store(struct device_driver *ddp,
4562 const char *buf, size_t count)
4564 /* We only care what the first byte of the data is the rest is unused.
4565 * if it's a '1' we turn on debug and if it's a '0' we disable it. All
4566 * other values have -EINVAL returned if they are passed in.
4569 if (buf[0] == '0') {
4570 debugging = NO_DEBUG;
4572 } else if (buf[0] == '1') {
4580 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
4582 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
4584 static DRIVER_ATTR_RW(debug_flag);
4587 static struct attribute *st_drv_attrs[] = {
4588 &driver_attr_try_direct_io.attr,
4589 &driver_attr_fixed_buffer_size.attr,
4590 &driver_attr_max_sg_segs.attr,
4591 &driver_attr_version.attr,
4593 &driver_attr_debug_flag.attr,
4597 ATTRIBUTE_GROUPS(st_drv);
4599 /* The sysfs simple class interface */
4601 defined_show(struct device *dev, struct device_attribute *attr, char *buf)
4603 struct st_modedef *STm = dev_get_drvdata(dev);
4606 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4609 static DEVICE_ATTR_RO(defined);
4612 default_blksize_show(struct device *dev, struct device_attribute *attr,
4615 struct st_modedef *STm = dev_get_drvdata(dev);
4618 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4621 static DEVICE_ATTR_RO(default_blksize);
4624 default_density_show(struct device *dev, struct device_attribute *attr,
4627 struct st_modedef *STm = dev_get_drvdata(dev);
4631 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4632 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4635 static DEVICE_ATTR_RO(default_density);
4638 default_compression_show(struct device *dev, struct device_attribute *attr,
4641 struct st_modedef *STm = dev_get_drvdata(dev);
4644 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4647 static DEVICE_ATTR_RO(default_compression);
4650 options_show(struct device *dev, struct device_attribute *attr, char *buf)
4652 struct st_modedef *STm = dev_get_drvdata(dev);
4653 struct scsi_tape *STp = STm->tape;
4657 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4658 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4659 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4660 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4661 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4662 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4663 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4664 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4665 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4666 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4667 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4668 options |= STm->sysv ? MT_ST_SYSV : 0;
4669 options |= STp->immediate ? MT_ST_NOWAIT : 0;
4670 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
4671 options |= STp->sili ? MT_ST_SILI : 0;
4673 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4676 static DEVICE_ATTR_RO(options);
4678 /* Support for tape stats */
4681 * read_cnt_show - return read count - count of reads made from tape drive
4682 * @dev: struct device
4683 * @attr: attribute structure
4684 * @buf: buffer to return formatted data in
4686 static ssize_t read_cnt_show(struct device *dev,
4687 struct device_attribute *attr, char *buf)
4689 struct st_modedef *STm = dev_get_drvdata(dev);
4691 return sprintf(buf, "%lld",
4692 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4694 static DEVICE_ATTR_RO(read_cnt);
4697 * read_byte_cnt_show - return read byte count - tape drives
4698 * may use blocks less than 512 bytes this gives the raw byte count of
4699 * of data read from the tape drive.
4700 * @dev: struct device
4701 * @attr: attribute structure
4702 * @buf: buffer to return formatted data in
4704 static ssize_t read_byte_cnt_show(struct device *dev,
4705 struct device_attribute *attr, char *buf)
4707 struct st_modedef *STm = dev_get_drvdata(dev);
4709 return sprintf(buf, "%lld",
4710 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4712 static DEVICE_ATTR_RO(read_byte_cnt);
4715 * read_ns_show - return read ns - overall time spent waiting on reads in ns.
4716 * @dev: struct device
4717 * @attr: attribute structure
4718 * @buf: buffer to return formatted data in
4720 static ssize_t read_ns_show(struct device *dev,
4721 struct device_attribute *attr, char *buf)
4723 struct st_modedef *STm = dev_get_drvdata(dev);
4725 return sprintf(buf, "%lld",
4726 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4728 static DEVICE_ATTR_RO(read_ns);
4731 * write_cnt_show - write count - number of user calls
4732 * to write(2) that have written data to tape.
4733 * @dev: struct device
4734 * @attr: attribute structure
4735 * @buf: buffer to return formatted data in
4737 static ssize_t write_cnt_show(struct device *dev,
4738 struct device_attribute *attr, char *buf)
4740 struct st_modedef *STm = dev_get_drvdata(dev);
4742 return sprintf(buf, "%lld",
4743 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4745 static DEVICE_ATTR_RO(write_cnt);
4748 * write_byte_cnt_show - write byte count - raw count of
4749 * bytes written to tape.
4750 * @dev: struct device
4751 * @attr: attribute structure
4752 * @buf: buffer to return formatted data in
4754 static ssize_t write_byte_cnt_show(struct device *dev,
4755 struct device_attribute *attr, char *buf)
4757 struct st_modedef *STm = dev_get_drvdata(dev);
4759 return sprintf(buf, "%lld",
4760 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4762 static DEVICE_ATTR_RO(write_byte_cnt);
4765 * write_ns_show - write ns - number of nanoseconds waiting on write
4766 * requests to complete.
4767 * @dev: struct device
4768 * @attr: attribute structure
4769 * @buf: buffer to return formatted data in
4771 static ssize_t write_ns_show(struct device *dev,
4772 struct device_attribute *attr, char *buf)
4774 struct st_modedef *STm = dev_get_drvdata(dev);
4776 return sprintf(buf, "%lld",
4777 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4779 static DEVICE_ATTR_RO(write_ns);
4782 * in_flight_show - number of I/Os currently in flight -
4783 * in most cases this will be either 0 or 1. It may be higher if someone
4784 * has also issued other SCSI commands such as via an ioctl.
4785 * @dev: struct device
4786 * @attr: attribute structure
4787 * @buf: buffer to return formatted data in
4789 static ssize_t in_flight_show(struct device *dev,
4790 struct device_attribute *attr, char *buf)
4792 struct st_modedef *STm = dev_get_drvdata(dev);
4794 return sprintf(buf, "%lld",
4795 (long long)atomic64_read(&STm->tape->stats->in_flight));
4797 static DEVICE_ATTR_RO(in_flight);
4800 * io_ns_show - io wait ns - this is the number of ns spent
4801 * waiting on all I/O to complete. This includes tape movement commands
4802 * such as rewinding, seeking to end of file or tape, it also includes
4803 * read and write. To determine the time spent on tape movement
4804 * subtract the read and write ns from this value.
4805 * @dev: struct device
4806 * @attr: attribute structure
4807 * @buf: buffer to return formatted data in
4809 static ssize_t io_ns_show(struct device *dev,
4810 struct device_attribute *attr, char *buf)
4812 struct st_modedef *STm = dev_get_drvdata(dev);
4814 return sprintf(buf, "%lld",
4815 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4817 static DEVICE_ATTR_RO(io_ns);
4820 * other_cnt_show - other io count - this is the number of
4821 * I/O requests other than read and write requests.
4822 * Typically these are tape movement requests but will include driver
4823 * tape movement. This includes only requests issued by the st driver.
4824 * @dev: struct device
4825 * @attr: attribute structure
4826 * @buf: buffer to return formatted data in
4828 static ssize_t other_cnt_show(struct device *dev,
4829 struct device_attribute *attr, char *buf)
4831 struct st_modedef *STm = dev_get_drvdata(dev);
4833 return sprintf(buf, "%lld",
4834 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4836 static DEVICE_ATTR_RO(other_cnt);
4839 * resid_cnt_show - A count of the number of times we get a residual
4840 * count - this should indicate someone issuing reads larger than the
4841 * block size on tape.
4842 * @dev: struct device
4843 * @attr: attribute structure
4844 * @buf: buffer to return formatted data in
4846 static ssize_t resid_cnt_show(struct device *dev,
4847 struct device_attribute *attr, char *buf)
4849 struct st_modedef *STm = dev_get_drvdata(dev);
4851 return sprintf(buf, "%lld",
4852 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4854 static DEVICE_ATTR_RO(resid_cnt);
4856 static struct attribute *st_dev_attrs[] = {
4857 &dev_attr_defined.attr,
4858 &dev_attr_default_blksize.attr,
4859 &dev_attr_default_density.attr,
4860 &dev_attr_default_compression.attr,
4861 &dev_attr_options.attr,
4865 static struct attribute *st_stats_attrs[] = {
4866 &dev_attr_read_cnt.attr,
4867 &dev_attr_read_byte_cnt.attr,
4868 &dev_attr_read_ns.attr,
4869 &dev_attr_write_cnt.attr,
4870 &dev_attr_write_byte_cnt.attr,
4871 &dev_attr_write_ns.attr,
4872 &dev_attr_in_flight.attr,
4873 &dev_attr_io_ns.attr,
4874 &dev_attr_other_cnt.attr,
4875 &dev_attr_resid_cnt.attr,
4879 static struct attribute_group stats_group = {
4881 .attrs = st_stats_attrs,
4884 static struct attribute_group st_group = {
4885 .attrs = st_dev_attrs,
4888 static const struct attribute_group *st_dev_groups[] = {
4894 /* The following functions may be useful for a larger audience. */
4895 static int sgl_map_user_pages(struct st_buffer *STbp,
4896 const unsigned int max_pages, unsigned long uaddr,
4897 size_t count, int rw)
4899 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4900 unsigned long start = uaddr >> PAGE_SHIFT;
4901 const int nr_pages = end - start;
4903 struct page **pages;
4904 struct rq_map_data *mdata = &STbp->map_data;
4906 /* User attempted Overflow! */
4907 if ((uaddr + count) < uaddr)
4911 if (nr_pages > max_pages)
4918 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4921 /* Try to fault in all of the necessary pages */
4922 /* rw==READ means read from drive, write into memory area */
4923 res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages);
4925 /* Errors and no page mapped should return here */
4929 for (i=0; i < nr_pages; i++) {
4930 /* FIXME: flush superflous for rw==READ,
4931 * probably wrong function for rw==WRITE
4933 flush_dcache_page(pages[i]);
4936 mdata->offset = uaddr & ~PAGE_MASK;
4937 STbp->mapped_pages = pages;
4942 for (j=0; j < res; j++)
4951 /* And unmap them... */
4952 static int sgl_unmap_user_pages(struct st_buffer *STbp,
4953 const unsigned int nr_pages, int dirtied)
4957 for (i=0; i < nr_pages; i++) {
4958 struct page *page = STbp->mapped_pages[i];
4962 /* FIXME: cache flush missing for rw==READ
4963 * FIXME: call the correct reference counting function
4967 kfree(STbp->mapped_pages);
4968 STbp->mapped_pages = NULL;