2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV
= (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE
= (1 << 0),
130 IDETAPE_DIR_READ
= (1 << 1),
131 IDETAPE_DIR_WRITE
= (1 << 2),
137 struct idetape_bh
*b_reqnext
;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
156 #define IDETAPE_BLOCK_DESCRIPTOR 0
157 #define IDETAPE_CAPABILITIES_PAGE 0x2a
160 * Most of our global data which we need to save even as we leave the driver due
161 * to an interrupt or a timer event is stored in the struct defined below.
163 typedef struct ide_tape_obj
{
165 struct ide_driver
*driver
;
166 struct gendisk
*disk
;
169 /* used by REQ_IDETAPE_{READ,WRITE} requests */
170 struct ide_atapi_pc queued_pc
;
173 * DSC polling variables.
175 * While polling for DSC we use postponed_rq to postpone the current
176 * request so that ide.c will be able to service pending requests on the
177 * other device. Note that at most we will have only one DSC (usually
178 * data transfer) request in the device request queue.
180 struct request
*postponed_rq
;
181 /* The time in which we started polling for DSC */
182 unsigned long dsc_polling_start
;
183 /* Timer used to poll for dsc */
184 struct timer_list dsc_timer
;
185 /* Read/Write dsc polling frequency */
186 unsigned long best_dsc_rw_freq
;
187 unsigned long dsc_poll_freq
;
188 unsigned long dsc_timeout
;
190 /* Read position information */
193 unsigned int first_frame
;
195 /* Last error information */
196 u8 sense_key
, asc
, ascq
;
198 /* Character device operation */
202 /* Current character device data transfer direction */
205 /* tape block size, usually 512 or 1024 bytes */
206 unsigned short blk_size
;
209 /* Copy of the tape's Capabilities and Mechanical Page */
213 * Active data transfer request parameters.
215 * At most, there is only one ide-tape originated data transfer request
216 * in the device request queue. This allows ide.c to easily service
217 * requests from the other device when we postpone our active request.
220 /* Data buffer size chosen based on the tape's recommendation */
223 struct idetape_bh
*merge_bh
;
224 /* size of the merge buffer */
226 /* pointer to current buffer head within the merge buffer */
227 struct idetape_bh
*bh
;
231 int pages_per_buffer
;
232 /* Wasted space in each stage */
235 /* Measures average tape speed */
236 unsigned long avg_time
;
240 /* the door is currently locked */
242 /* the tape hardware is write protected */
244 /* the tape is write protected (hardware or opened as read-only) */
250 static DEFINE_MUTEX(idetape_ref_mutex
);
252 static struct class *idetape_sysfs_class
;
254 static void ide_tape_release(struct device
*);
256 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
258 struct ide_tape_obj
*tape
= NULL
;
260 mutex_lock(&idetape_ref_mutex
);
261 tape
= ide_drv_g(disk
, ide_tape_obj
);
263 if (ide_device_get(tape
->drive
))
266 get_device(&tape
->dev
);
268 mutex_unlock(&idetape_ref_mutex
);
272 static void ide_tape_put(struct ide_tape_obj
*tape
)
274 ide_drive_t
*drive
= tape
->drive
;
276 mutex_lock(&idetape_ref_mutex
);
277 put_device(&tape
->dev
);
278 ide_device_put(drive
);
279 mutex_unlock(&idetape_ref_mutex
);
283 * The variables below are used for the character device interface. Additional
284 * state variables are defined in our ide_drive_t structure.
286 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
288 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
290 struct ide_tape_obj
*tape
= NULL
;
292 mutex_lock(&idetape_ref_mutex
);
293 tape
= idetape_devs
[i
];
295 get_device(&tape
->dev
);
296 mutex_unlock(&idetape_ref_mutex
);
300 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
303 struct idetape_bh
*bh
= pc
->bh
;
308 printk(KERN_ERR
"ide-tape: bh == NULL in "
309 "idetape_input_buffers\n");
310 ide_pad_transfer(drive
, 0, bcount
);
314 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
316 drive
->hwif
->tp_ops
->input_data(drive
, NULL
, bh
->b_data
+
317 atomic_read(&bh
->b_count
), count
);
319 atomic_add(count
, &bh
->b_count
);
320 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
323 atomic_set(&bh
->b_count
, 0);
329 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
332 struct idetape_bh
*bh
= pc
->bh
;
337 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
341 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
342 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, pc
->b_data
, count
);
345 pc
->b_count
-= count
;
350 pc
->b_data
= bh
->b_data
;
351 pc
->b_count
= atomic_read(&bh
->b_count
);
357 static void idetape_update_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
359 struct idetape_bh
*bh
= pc
->bh
;
361 unsigned int bcount
= pc
->xferred
;
363 if (pc
->flags
& PC_FLAG_WRITING
)
367 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
371 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
372 atomic_set(&bh
->b_count
, count
);
373 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
381 * called on each failed packet command retry to analyze the request sense. We
382 * currently do not utilize this information.
384 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
386 idetape_tape_t
*tape
= drive
->driver_data
;
387 struct ide_atapi_pc
*pc
= drive
->failed_pc
;
389 tape
->sense_key
= sense
[2] & 0xF;
390 tape
->asc
= sense
[12];
391 tape
->ascq
= sense
[13];
393 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
394 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
396 /* Correct pc->xferred by asking the tape. */
397 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
398 pc
->xferred
= pc
->req_xfer
-
400 get_unaligned_be32(&sense
[3]);
401 idetape_update_buffers(drive
, pc
);
405 * If error was the result of a zero-length read or write command,
406 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
407 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
409 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
411 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
412 if (tape
->sense_key
== 5) {
413 /* don't report an error, everything's ok */
415 /* don't retry read/write */
416 pc
->flags
|= PC_FLAG_ABORT
;
419 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
420 pc
->error
= IDE_DRV_ERROR_FILEMARK
;
421 pc
->flags
|= PC_FLAG_ABORT
;
423 if (pc
->c
[0] == WRITE_6
) {
424 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
425 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
426 pc
->error
= IDE_DRV_ERROR_EOD
;
427 pc
->flags
|= PC_FLAG_ABORT
;
430 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
431 if (tape
->sense_key
== 8) {
432 pc
->error
= IDE_DRV_ERROR_EOD
;
433 pc
->flags
|= PC_FLAG_ABORT
;
435 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
437 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
441 /* Free data buffers completely. */
442 static void ide_tape_kfree_buffer(idetape_tape_t
*tape
)
444 struct idetape_bh
*prev_bh
, *bh
= tape
->merge_bh
;
447 u32 size
= bh
->b_size
;
450 unsigned int order
= fls(size
>> PAGE_SHIFT
)-1;
453 free_pages((unsigned long)bh
->b_data
, order
);
456 bh
->b_data
+= (1 << order
) * PAGE_SIZE
;
464 static void ide_tape_handle_dsc(ide_drive_t
*);
466 static int ide_tape_callback(ide_drive_t
*drive
, int dsc
)
468 idetape_tape_t
*tape
= drive
->driver_data
;
469 struct ide_atapi_pc
*pc
= drive
->pc
;
470 struct request
*rq
= drive
->hwif
->rq
;
471 int uptodate
= pc
->error
? 0 : 1;
472 int err
= uptodate
? 0 : IDE_DRV_ERROR_GENERAL
;
474 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
477 ide_tape_handle_dsc(drive
);
479 if (drive
->failed_pc
== pc
)
480 drive
->failed_pc
= NULL
;
482 if (pc
->c
[0] == REQUEST_SENSE
) {
484 idetape_analyze_error(drive
, pc
->buf
);
486 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE "
487 "itself - Aborting request!\n");
488 } else if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
489 int blocks
= pc
->xferred
/ tape
->blk_size
;
491 tape
->avg_size
+= blocks
* tape
->blk_size
;
493 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
494 tape
->avg_speed
= tape
->avg_size
* HZ
/
495 (jiffies
- tape
->avg_time
) / 1024;
497 tape
->avg_time
= jiffies
;
500 tape
->first_frame
+= blocks
;
501 rq
->current_nr_sectors
-= blocks
;
507 } else if (pc
->c
[0] == READ_POSITION
&& uptodate
) {
508 u8
*readpos
= pc
->buf
;
510 debug_log(DBG_SENSE
, "BOP - %s\n",
511 (readpos
[0] & 0x80) ? "Yes" : "No");
512 debug_log(DBG_SENSE
, "EOP - %s\n",
513 (readpos
[0] & 0x40) ? "Yes" : "No");
515 if (readpos
[0] & 0x4) {
516 printk(KERN_INFO
"ide-tape: Block location is unknown"
518 clear_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
520 err
= IDE_DRV_ERROR_GENERAL
;
522 debug_log(DBG_SENSE
, "Block Location - %u\n",
523 be32_to_cpup((__be32
*)&readpos
[4]));
525 tape
->partition
= readpos
[1];
526 tape
->first_frame
= be32_to_cpup((__be32
*)&readpos
[4]);
527 set_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
537 * Postpone the current request so that ide.c will be able to service requests
538 * from another device on the same port while we are polling for DSC.
540 static void idetape_postpone_request(ide_drive_t
*drive
)
542 idetape_tape_t
*tape
= drive
->driver_data
;
544 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
546 tape
->postponed_rq
= drive
->hwif
->rq
;
548 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
551 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
553 idetape_tape_t
*tape
= drive
->driver_data
;
555 /* Media access command */
556 tape
->dsc_polling_start
= jiffies
;
557 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
558 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
559 /* Allow ide.c to handle other requests */
560 idetape_postpone_request(drive
);
563 static int ide_tape_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
564 unsigned int bcount
, int write
)
567 idetape_output_buffers(drive
, pc
, bcount
);
569 idetape_input_buffers(drive
, pc
, bcount
);
575 * Packet Command Interface
577 * The current Packet Command is available in drive->pc, and will not change
578 * until we finish handling it. Each packet command is associated with a
579 * callback function that will be called when the command is finished.
581 * The handling will be done in three stages:
583 * 1. idetape_issue_pc will send the packet command to the drive, and will set
584 * the interrupt handler to ide_pc_intr.
586 * 2. On each interrupt, ide_pc_intr will be called. This step will be
587 * repeated until the device signals us that no more interrupts will be issued.
589 * 3. ATAPI Tape media access commands have immediate status with a delayed
590 * process. In case of a successful initiation of a media access packet command,
591 * the DSC bit will be set when the actual execution of the command is finished.
592 * Since the tape drive will not issue an interrupt, we have to poll for this
593 * event. In this case, we define the request as "low priority request" by
594 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
597 * ide.c will then give higher priority to requests which originate from the
598 * other device, until will change rq_status to RQ_ACTIVE.
600 * 4. When the packet command is finished, it will be checked for errors.
602 * 5. In case an error was found, we queue a request sense packet command in
603 * front of the request queue and retry the operation up to
604 * IDETAPE_MAX_PC_RETRIES times.
606 * 6. In case no error was found, or we decided to give up and not to retry
607 * again, the callback function will be called and then we will handle the next
611 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
612 struct ide_atapi_pc
*pc
)
614 idetape_tape_t
*tape
= drive
->driver_data
;
616 if (drive
->pc
->c
[0] == REQUEST_SENSE
&&
617 pc
->c
[0] == REQUEST_SENSE
) {
618 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
619 "Two request sense in serial were issued\n");
622 if (drive
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
623 drive
->failed_pc
= pc
;
625 /* Set the current packet command */
628 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
629 (pc
->flags
& PC_FLAG_ABORT
)) {
631 * We will "abort" retrying a packet command in case legitimate
632 * error code was received (crossing a filemark, or end of the
633 * media, for example).
635 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
636 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
637 tape
->sense_key
== 2 && tape
->asc
== 4 &&
638 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
639 printk(KERN_ERR
"ide-tape: %s: I/O error, "
640 "pc = %2x, key = %2x, "
641 "asc = %2x, ascq = %2x\n",
642 tape
->name
, pc
->c
[0],
643 tape
->sense_key
, tape
->asc
,
647 pc
->error
= IDE_DRV_ERROR_GENERAL
;
649 drive
->failed_pc
= NULL
;
650 drive
->pc_callback(drive
, 0);
653 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
657 return ide_issue_pc(drive
);
660 /* A mode sense command is used to "sense" tape parameters. */
661 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
664 pc
->c
[0] = MODE_SENSE
;
665 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
666 /* DBD = 1 - Don't return block descriptors */
668 pc
->c
[2] = page_code
;
670 * Changed pc->c[3] to 0 (255 will at best return unused info).
672 * For SCSI this byte is defined as subpage instead of high byte
673 * of length and some IDE drives seem to interpret it this way
674 * and return an error when 255 is used.
677 /* We will just discard data in that case */
679 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
681 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
687 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
689 ide_hwif_t
*hwif
= drive
->hwif
;
690 idetape_tape_t
*tape
= drive
->driver_data
;
691 struct ide_atapi_pc
*pc
= drive
->pc
;
694 stat
= hwif
->tp_ops
->read_status(hwif
);
696 if (stat
& ATA_DSC
) {
697 if (stat
& ATA_ERR
) {
699 if (pc
->c
[0] != TEST_UNIT_READY
)
700 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
702 /* Retry operation */
703 ide_retry_pc(drive
, tape
->disk
);
708 pc
->error
= IDE_DRV_ERROR_GENERAL
;
709 drive
->failed_pc
= NULL
;
711 drive
->pc_callback(drive
, 0);
715 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
716 struct ide_atapi_pc
*pc
, struct request
*rq
,
719 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
720 unsigned int length
= rq
->current_nr_sectors
;
723 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
727 pc
->buf_size
= length
* tape
->blk_size
;
728 pc
->req_xfer
= pc
->buf_size
;
729 if (pc
->req_xfer
== tape
->buffer_size
)
730 pc
->flags
|= PC_FLAG_DMA_OK
;
732 if (opcode
== READ_6
) {
734 atomic_set(&bh
->b_count
, 0);
735 } else if (opcode
== WRITE_6
) {
737 pc
->flags
|= PC_FLAG_WRITING
;
738 pc
->b_data
= bh
->b_data
;
739 pc
->b_count
= atomic_read(&bh
->b_count
);
742 memcpy(rq
->cmd
, pc
->c
, 12);
745 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
746 struct request
*rq
, sector_t block
)
748 ide_hwif_t
*hwif
= drive
->hwif
;
749 idetape_tape_t
*tape
= drive
->driver_data
;
750 struct ide_atapi_pc
*pc
= NULL
;
751 struct request
*postponed_rq
= tape
->postponed_rq
;
754 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
755 " current_nr_sectors: %u\n",
756 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
757 rq
->current_nr_sectors
);
759 if (!blk_special_request(rq
)) {
760 /* We do not support buffer cache originated requests. */
761 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
762 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
763 if (blk_fs_request(rq
) == 0 && rq
->errors
== 0)
765 ide_complete_rq(drive
, -EIO
, ide_rq_bytes(rq
));
769 /* Retry a failed packet command */
770 if (drive
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
771 pc
= drive
->failed_pc
;
775 if (postponed_rq
!= NULL
)
776 if (rq
!= postponed_rq
) {
777 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
778 "Two DSC requests were queued\n");
779 drive
->failed_pc
= NULL
;
781 ide_complete_rq(drive
, 0, blk_rq_bytes(rq
));
785 tape
->postponed_rq
= NULL
;
788 * If the tape is still busy, postpone our request and service
789 * the other device meanwhile.
791 stat
= hwif
->tp_ops
->read_status(hwif
);
793 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
794 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
795 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
797 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
798 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
799 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
802 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
803 (stat
& ATA_DSC
) == 0) {
804 if (postponed_rq
== NULL
) {
805 tape
->dsc_polling_start
= jiffies
;
806 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
807 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
808 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
809 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
811 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
812 idetape_media_access_finished(drive
);
815 return ide_do_reset(drive
);
817 } else if (time_after(jiffies
,
818 tape
->dsc_polling_start
+
819 IDETAPE_DSC_MA_THRESHOLD
))
820 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
821 idetape_postpone_request(drive
);
824 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
825 pc
= &tape
->queued_pc
;
826 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
829 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
830 pc
= &tape
->queued_pc
;
831 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
834 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
835 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
836 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
837 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
840 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
841 idetape_media_access_finished(drive
);
847 return idetape_issue_pc(drive
, pc
);
851 * The function below uses __get_free_pages to allocate a data buffer of size
852 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
855 * It returns a pointer to the newly allocated buffer, or NULL in case of
858 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
861 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
862 int pages
= tape
->pages_per_buffer
;
863 unsigned int order
, b_allocd
;
866 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
871 order
= fls(pages
) - 1;
872 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
875 b_allocd
= (1 << order
) * PAGE_SIZE
;
879 memset(bh
->b_data
, 0, b_allocd
);
880 bh
->b_reqnext
= NULL
;
881 bh
->b_size
= b_allocd
;
882 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
885 order
= fls(pages
) - 1;
886 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
889 b_allocd
= (1 << order
) * PAGE_SIZE
;
892 memset(b_data
, 0, b_allocd
);
894 /* newly allocated page frames below buffer header or ...*/
895 if (bh
->b_data
== b_data
+ b_allocd
) {
896 bh
->b_size
+= b_allocd
;
897 bh
->b_data
-= b_allocd
;
899 atomic_add(b_allocd
, &bh
->b_count
);
902 /* they are above the header */
903 if (b_data
== bh
->b_data
+ bh
->b_size
) {
904 bh
->b_size
+= b_allocd
;
906 atomic_add(b_allocd
, &bh
->b_count
);
910 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
912 free_pages((unsigned long) b_data
, order
);
915 bh
->b_reqnext
= NULL
;
917 bh
->b_size
= b_allocd
;
918 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
919 prev_bh
->b_reqnext
= bh
;
924 bh
->b_size
-= tape
->excess_bh_size
;
926 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
929 ide_tape_kfree_buffer(tape
);
933 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
934 const char __user
*buf
, int n
)
936 struct idetape_bh
*bh
= tape
->bh
;
942 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
946 count
= min((unsigned int)
947 (bh
->b_size
- atomic_read(&bh
->b_count
)),
949 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
953 atomic_add(count
, &bh
->b_count
);
955 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
958 atomic_set(&bh
->b_count
, 0);
965 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
968 struct idetape_bh
*bh
= tape
->bh
;
974 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
978 count
= min(tape
->b_count
, n
);
979 if (copy_to_user(buf
, tape
->b_data
, count
))
982 tape
->b_data
+= count
;
983 tape
->b_count
-= count
;
985 if (!tape
->b_count
) {
989 tape
->b_data
= bh
->b_data
;
990 tape
->b_count
= atomic_read(&bh
->b_count
);
997 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
999 struct idetape_bh
*bh
= tape
->merge_bh
;
1000 tape
->bh
= tape
->merge_bh
;
1002 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1003 atomic_set(&bh
->b_count
, 0);
1005 tape
->b_data
= bh
->b_data
;
1006 tape
->b_count
= atomic_read(&bh
->b_count
);
1011 * Write a filemark if write_filemark=1. Flush the device buffers without
1012 * writing a filemark otherwise.
1014 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1015 struct ide_atapi_pc
*pc
, int write_filemark
)
1018 pc
->c
[0] = WRITE_FILEMARKS
;
1019 pc
->c
[4] = write_filemark
;
1020 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1023 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1025 idetape_tape_t
*tape
= drive
->driver_data
;
1026 struct gendisk
*disk
= tape
->disk
;
1027 int load_attempted
= 0;
1029 /* Wait for the tape to become ready */
1030 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1032 while (time_before(jiffies
, timeout
)) {
1033 if (ide_do_test_unit_ready(drive
, disk
) == 0)
1035 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1036 || (tape
->asc
== 0x3A)) {
1040 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1042 /* not about to be ready */
1043 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1044 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1051 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1053 struct ide_tape_obj
*tape
= drive
->driver_data
;
1054 struct ide_atapi_pc pc
;
1057 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1058 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
1061 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1065 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1068 pc
->c
[0] = READ_POSITION
;
1072 static int idetape_read_position(ide_drive_t
*drive
)
1074 idetape_tape_t
*tape
= drive
->driver_data
;
1075 struct ide_atapi_pc pc
;
1078 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1080 idetape_create_read_position_cmd(&pc
);
1081 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
1083 position
= tape
->first_frame
;
1087 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1088 struct ide_atapi_pc
*pc
,
1089 unsigned int block
, u8 partition
, int skip
)
1092 pc
->c
[0] = POSITION_TO_ELEMENT
;
1094 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1095 pc
->c
[8] = partition
;
1096 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1099 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1101 idetape_tape_t
*tape
= drive
->driver_data
;
1103 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1106 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1107 tape
->merge_bh_size
= 0;
1108 if (tape
->merge_bh
!= NULL
) {
1109 ide_tape_kfree_buffer(tape
);
1110 tape
->merge_bh
= NULL
;
1113 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1117 * Position the tape to the requested block using the LOCATE packet command.
1118 * A READ POSITION command is then issued to check where we are positioned. Like
1119 * all higher level operations, we queue the commands at the tail of the request
1120 * queue and wait for their completion.
1122 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1123 u8 partition
, int skip
)
1125 idetape_tape_t
*tape
= drive
->driver_data
;
1126 struct gendisk
*disk
= tape
->disk
;
1128 struct ide_atapi_pc pc
;
1130 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1131 __ide_tape_discard_merge_buffer(drive
);
1132 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1133 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1134 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1138 idetape_create_read_position_cmd(&pc
);
1139 return ide_queue_pc_tail(drive
, disk
, &pc
);
1142 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1143 int restore_position
)
1145 idetape_tape_t
*tape
= drive
->driver_data
;
1148 __ide_tape_discard_merge_buffer(drive
);
1149 if (restore_position
) {
1150 position
= idetape_read_position(drive
);
1151 seek
= position
> 0 ? position
: 0;
1152 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1153 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1154 " %s\n", tape
->name
, __func__
);
1161 * Generate a read/write request for the block device interface and wait for it
1164 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1165 struct idetape_bh
*bh
)
1167 idetape_tape_t
*tape
= drive
->driver_data
;
1171 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1173 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1174 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1176 rq
->rq_disk
= tape
->disk
;
1177 rq
->special
= (void *)bh
;
1178 rq
->sector
= tape
->first_frame
;
1179 rq
->nr_sectors
= blocks
;
1180 rq
->current_nr_sectors
= blocks
;
1181 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1183 errors
= rq
->errors
;
1184 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1185 blk_put_request(rq
);
1187 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1191 idetape_init_merge_buffer(tape
);
1192 if (errors
== IDE_DRV_ERROR_GENERAL
)
1197 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1205 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1206 struct ide_atapi_pc
*pc
)
1209 pc
->c
[0] = REZERO_UNIT
;
1210 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1213 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1218 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1221 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1225 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1227 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1230 /* Queue up a character device originated write request. */
1231 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1233 idetape_tape_t
*tape
= drive
->driver_data
;
1235 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1237 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1238 blocks
, tape
->merge_bh
);
1241 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1243 idetape_tape_t
*tape
= drive
->driver_data
;
1245 struct idetape_bh
*bh
;
1247 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1248 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1249 " but we are not writing.\n");
1252 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1253 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1254 tape
->merge_bh_size
= tape
->buffer_size
;
1256 if (tape
->merge_bh_size
) {
1257 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1258 if (tape
->merge_bh_size
% tape
->blk_size
) {
1262 i
= tape
->blk_size
- tape
->merge_bh_size
%
1264 bh
= tape
->bh
->b_reqnext
;
1266 atomic_set(&bh
->b_count
, 0);
1272 printk(KERN_INFO
"ide-tape: bug,"
1276 min
= min(i
, (unsigned int)(bh
->b_size
-
1277 atomic_read(&bh
->b_count
)));
1278 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1280 atomic_add(min
, &bh
->b_count
);
1285 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1286 tape
->merge_bh_size
= 0;
1288 if (tape
->merge_bh
!= NULL
) {
1289 ide_tape_kfree_buffer(tape
);
1290 tape
->merge_bh
= NULL
;
1292 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1295 static int idetape_init_read(ide_drive_t
*drive
)
1297 idetape_tape_t
*tape
= drive
->driver_data
;
1300 /* Initialize read operation */
1301 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1302 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1303 ide_tape_flush_merge_buffer(drive
);
1304 idetape_flush_tape_buffers(drive
);
1306 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1307 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1309 tape
->merge_bh_size
= 0;
1311 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1312 if (!tape
->merge_bh
)
1314 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1317 * Issue a read 0 command to ensure that DSC handshake is
1318 * switched from completion mode to buffer available mode.
1319 * No point in issuing this if DSC overlap isn't supported, some
1320 * drives (Seagate STT3401A) will return an error.
1322 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1323 bytes_read
= idetape_queue_rw_tail(drive
,
1324 REQ_IDETAPE_READ
, 0,
1326 if (bytes_read
< 0) {
1327 ide_tape_kfree_buffer(tape
);
1328 tape
->merge_bh
= NULL
;
1329 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1338 /* called from idetape_chrdev_read() to service a chrdev read request. */
1339 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1341 idetape_tape_t
*tape
= drive
->driver_data
;
1343 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1345 /* If we are at a filemark, return a read length of 0 */
1346 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1349 idetape_init_read(drive
);
1351 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1355 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1357 idetape_tape_t
*tape
= drive
->driver_data
;
1358 struct idetape_bh
*bh
;
1364 bh
= tape
->merge_bh
;
1365 count
= min(tape
->buffer_size
, bcount
);
1367 blocks
= count
/ tape
->blk_size
;
1369 atomic_set(&bh
->b_count
,
1370 min(count
, (unsigned int)bh
->b_size
));
1371 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1372 count
-= atomic_read(&bh
->b_count
);
1375 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1381 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1382 * currently support only one partition.
1384 static int idetape_rewind_tape(ide_drive_t
*drive
)
1386 struct ide_tape_obj
*tape
= drive
->driver_data
;
1387 struct gendisk
*disk
= tape
->disk
;
1389 struct ide_atapi_pc pc
;
1391 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1393 idetape_create_rewind_cmd(drive
, &pc
);
1394 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1398 idetape_create_read_position_cmd(&pc
);
1399 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1405 /* mtio.h compatible commands should be issued to the chrdev interface. */
1406 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1409 idetape_tape_t
*tape
= drive
->driver_data
;
1410 void __user
*argp
= (void __user
*)arg
;
1412 struct idetape_config
{
1413 int dsc_rw_frequency
;
1414 int dsc_media_access_frequency
;
1418 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1422 if (copy_from_user(&config
, argp
, sizeof(config
)))
1424 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1427 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1428 config
.nr_stages
= 1;
1429 if (copy_to_user(argp
, &config
, sizeof(config
)))
1438 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1441 idetape_tape_t
*tape
= drive
->driver_data
;
1442 struct gendisk
*disk
= tape
->disk
;
1443 struct ide_atapi_pc pc
;
1444 int retval
, count
= 0;
1445 int sprev
= !!(tape
->caps
[4] & 0x20);
1449 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1452 mt_count
= -mt_count
;
1455 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1456 tape
->merge_bh_size
= 0;
1457 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1459 ide_tape_discard_merge_buffer(drive
, 0);
1465 idetape_create_space_cmd(&pc
, mt_count
- count
,
1466 IDETAPE_SPACE_OVER_FILEMARK
);
1467 return ide_queue_pc_tail(drive
, disk
, &pc
);
1472 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1476 count
= (MTBSFM
== mt_op
? 1 : -1);
1477 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1479 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1486 * Our character device read / write functions.
1488 * The tape is optimized to maximize throughput when it is transferring an
1489 * integral number of the "continuous transfer limit", which is a parameter of
1490 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1492 * As of version 1.3 of the driver, the character device provides an abstract
1493 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1494 * same backup/restore procedure is supported. The driver will internally
1495 * convert the requests to the recommended transfer unit, so that an unmatch
1496 * between the user's block size to the recommended size will only result in a
1497 * (slightly) increased driver overhead, but will no longer hit performance.
1498 * This is not applicable to Onstream.
1500 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1501 size_t count
, loff_t
*ppos
)
1503 struct ide_tape_obj
*tape
= file
->private_data
;
1504 ide_drive_t
*drive
= tape
->drive
;
1505 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1507 u16 ctl
= *(u16
*)&tape
->caps
[12];
1509 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1511 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1512 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1513 if (count
> tape
->blk_size
&&
1514 (count
% tape
->blk_size
) == 0)
1515 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1517 rc
= idetape_init_read(drive
);
1522 if (tape
->merge_bh_size
) {
1523 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1524 (unsigned int)count
);
1525 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1527 buf
+= actually_read
;
1528 tape
->merge_bh_size
-= actually_read
;
1529 count
-= actually_read
;
1531 while (count
>= tape
->buffer_size
) {
1532 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1533 if (bytes_read
<= 0)
1535 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1538 count
-= bytes_read
;
1539 actually_read
+= bytes_read
;
1542 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1543 if (bytes_read
<= 0)
1545 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1546 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1548 actually_read
+= temp
;
1549 tape
->merge_bh_size
= bytes_read
-temp
;
1552 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1553 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1555 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1559 return ret
? ret
: actually_read
;
1562 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1563 size_t count
, loff_t
*ppos
)
1565 struct ide_tape_obj
*tape
= file
->private_data
;
1566 ide_drive_t
*drive
= tape
->drive
;
1567 ssize_t actually_written
= 0;
1569 u16 ctl
= *(u16
*)&tape
->caps
[12];
1571 /* The drive is write protected. */
1572 if (tape
->write_prot
)
1575 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1577 /* Initialize write operation */
1578 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1579 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1580 ide_tape_discard_merge_buffer(drive
, 1);
1581 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1582 printk(KERN_ERR
"ide-tape: merge_bh_size "
1583 "should be 0 now\n");
1584 tape
->merge_bh_size
= 0;
1586 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1587 if (!tape
->merge_bh
)
1589 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1590 idetape_init_merge_buffer(tape
);
1593 * Issue a write 0 command to ensure that DSC handshake is
1594 * switched from completion mode to buffer available mode. No
1595 * point in issuing this if DSC overlap isn't supported, some
1596 * drives (Seagate STT3401A) will return an error.
1598 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1599 ssize_t retval
= idetape_queue_rw_tail(drive
,
1600 REQ_IDETAPE_WRITE
, 0,
1603 ide_tape_kfree_buffer(tape
);
1604 tape
->merge_bh
= NULL
;
1605 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1612 if (tape
->merge_bh_size
) {
1613 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1614 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1615 tape
->merge_bh_size
= 0;
1617 actually_written
= min((unsigned int)
1618 (tape
->buffer_size
- tape
->merge_bh_size
),
1619 (unsigned int)count
);
1620 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1622 buf
+= actually_written
;
1623 tape
->merge_bh_size
+= actually_written
;
1624 count
-= actually_written
;
1626 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1628 tape
->merge_bh_size
= 0;
1629 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1634 while (count
>= tape
->buffer_size
) {
1636 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1638 buf
+= tape
->buffer_size
;
1639 count
-= tape
->buffer_size
;
1640 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1641 actually_written
+= tape
->buffer_size
;
1646 actually_written
+= count
;
1647 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1649 tape
->merge_bh_size
+= count
;
1651 return ret
? ret
: actually_written
;
1654 static int idetape_write_filemark(ide_drive_t
*drive
)
1656 struct ide_tape_obj
*tape
= drive
->driver_data
;
1657 struct ide_atapi_pc pc
;
1659 /* Write a filemark */
1660 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1661 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1662 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1669 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1672 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1673 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1674 * usually not supported.
1676 * The following commands are currently not supported:
1678 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1679 * MT_ST_WRITE_THRESHOLD.
1681 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1683 idetape_tape_t
*tape
= drive
->driver_data
;
1684 struct gendisk
*disk
= tape
->disk
;
1685 struct ide_atapi_pc pc
;
1688 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1698 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1705 if (tape
->write_prot
)
1707 ide_tape_discard_merge_buffer(drive
, 1);
1708 for (i
= 0; i
< mt_count
; i
++) {
1709 retval
= idetape_write_filemark(drive
);
1715 ide_tape_discard_merge_buffer(drive
, 0);
1716 if (idetape_rewind_tape(drive
))
1720 ide_tape_discard_merge_buffer(drive
, 0);
1721 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1725 * If door is locked, attempt to unlock before
1726 * attempting to eject.
1728 if (tape
->door_locked
) {
1729 if (!ide_set_media_lock(drive
, disk
, 0))
1730 tape
->door_locked
= DOOR_UNLOCKED
;
1732 ide_tape_discard_merge_buffer(drive
, 0);
1733 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1735 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1738 ide_tape_discard_merge_buffer(drive
, 0);
1739 return idetape_flush_tape_buffers(drive
);
1741 ide_tape_discard_merge_buffer(drive
, 0);
1742 return ide_do_start_stop(drive
, disk
,
1743 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1745 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1746 return ide_queue_pc_tail(drive
, disk
, &pc
);
1748 (void)idetape_rewind_tape(drive
);
1749 idetape_create_erase_cmd(&pc
);
1750 return ide_queue_pc_tail(drive
, disk
, &pc
);
1753 if (mt_count
< tape
->blk_size
||
1754 mt_count
% tape
->blk_size
)
1756 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1757 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1759 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1762 ide_tape_discard_merge_buffer(drive
, 0);
1763 return idetape_position_tape(drive
,
1764 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1766 ide_tape_discard_merge_buffer(drive
, 0);
1767 return idetape_position_tape(drive
, 0, mt_count
, 0);
1771 retval
= ide_set_media_lock(drive
, disk
, 1);
1774 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1777 retval
= ide_set_media_lock(drive
, disk
, 0);
1780 tape
->door_locked
= DOOR_UNLOCKED
;
1783 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1790 * Our character device ioctls. General mtio.h magnetic io commands are
1791 * supported here, and not in the corresponding block interface. Our own
1792 * ide-tape ioctls are supported on both interfaces.
1794 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1795 unsigned int cmd
, unsigned long arg
)
1797 struct ide_tape_obj
*tape
= file
->private_data
;
1798 ide_drive_t
*drive
= tape
->drive
;
1802 int block_offset
= 0, position
= tape
->first_frame
;
1803 void __user
*argp
= (void __user
*)arg
;
1805 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1807 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1808 ide_tape_flush_merge_buffer(drive
);
1809 idetape_flush_tape_buffers(drive
);
1811 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1812 block_offset
= tape
->merge_bh_size
/
1813 (tape
->blk_size
* tape
->user_bs_factor
);
1814 position
= idetape_read_position(drive
);
1820 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1822 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1824 memset(&mtget
, 0, sizeof(struct mtget
));
1825 mtget
.mt_type
= MT_ISSCSI2
;
1826 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1828 ((tape
->blk_size
* tape
->user_bs_factor
)
1829 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1831 if (tape
->drv_write_prot
)
1832 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1834 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1838 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1839 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1843 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1844 ide_tape_discard_merge_buffer(drive
, 1);
1845 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1850 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1851 * block size with the reported value.
1853 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1855 idetape_tape_t
*tape
= drive
->driver_data
;
1856 struct ide_atapi_pc pc
;
1858 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1859 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1860 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1861 if (tape
->blk_size
== 0) {
1862 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1863 "block size, assuming 32k\n");
1864 tape
->blk_size
= 32768;
1868 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1869 (pc
.buf
[4 + 6] << 8) +
1871 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1874 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1876 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1878 idetape_tape_t
*tape
;
1881 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1885 tape
= ide_tape_chrdev_get(i
);
1891 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1894 * We really want to do nonseekable_open(inode, filp); here, but some
1895 * versions of tar incorrectly call lseek on tapes and bail out if that
1896 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1898 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1900 drive
= tape
->drive
;
1902 filp
->private_data
= tape
;
1904 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1909 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1911 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1912 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1916 idetape_read_position(drive
);
1917 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1918 (void)idetape_rewind_tape(drive
);
1920 /* Read block size and write protect status from drive. */
1921 ide_tape_get_bsize_from_bdesc(drive
);
1923 /* Set write protect flag if device is opened as read-only. */
1924 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1925 tape
->write_prot
= 1;
1927 tape
->write_prot
= tape
->drv_write_prot
;
1929 /* Make sure drive isn't write protected if user wants to write. */
1930 if (tape
->write_prot
) {
1931 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1932 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1933 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1939 /* Lock the tape drive door so user can't eject. */
1940 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1941 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1942 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1943 tape
->door_locked
= DOOR_LOCKED
;
1955 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1957 idetape_tape_t
*tape
= drive
->driver_data
;
1959 ide_tape_flush_merge_buffer(drive
);
1960 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
1961 if (tape
->merge_bh
!= NULL
) {
1962 idetape_pad_zeros(drive
, tape
->blk_size
*
1963 (tape
->user_bs_factor
- 1));
1964 ide_tape_kfree_buffer(tape
);
1965 tape
->merge_bh
= NULL
;
1967 idetape_write_filemark(drive
);
1968 idetape_flush_tape_buffers(drive
);
1969 idetape_flush_tape_buffers(drive
);
1972 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
1974 struct ide_tape_obj
*tape
= filp
->private_data
;
1975 ide_drive_t
*drive
= tape
->drive
;
1976 unsigned int minor
= iminor(inode
);
1979 tape
= drive
->driver_data
;
1981 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1983 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1984 idetape_write_release(drive
, minor
);
1985 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1987 ide_tape_discard_merge_buffer(drive
, 1);
1990 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
1991 (void) idetape_rewind_tape(drive
);
1992 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1993 if (tape
->door_locked
== DOOR_LOCKED
) {
1994 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
1995 tape
->door_locked
= DOOR_UNLOCKED
;
1998 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
2004 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2006 idetape_tape_t
*tape
= drive
->driver_data
;
2007 struct ide_atapi_pc pc
;
2008 char fw_rev
[4], vendor_id
[8], product_id
[16];
2010 idetape_create_inquiry_cmd(&pc
);
2011 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2012 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2016 memcpy(vendor_id
, &pc
.buf
[8], 8);
2017 memcpy(product_id
, &pc
.buf
[16], 16);
2018 memcpy(fw_rev
, &pc
.buf
[32], 4);
2020 ide_fixstring(vendor_id
, 8, 0);
2021 ide_fixstring(product_id
, 16, 0);
2022 ide_fixstring(fw_rev
, 4, 0);
2024 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2025 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2029 * Ask the tape about its various parameters. In particular, we will adjust our
2030 * data transfer buffer size to the recommended value as returned by the tape.
2032 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2034 idetape_tape_t
*tape
= drive
->driver_data
;
2035 struct ide_atapi_pc pc
;
2037 u8 speed
, max_speed
;
2039 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2040 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2041 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2042 " some default values\n");
2043 tape
->blk_size
= 512;
2044 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2045 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2046 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2049 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2051 /* convert to host order and save for later use */
2052 speed
= be16_to_cpup((__be16
*)&caps
[14]);
2053 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
2055 *(u16
*)&caps
[8] = max_speed
;
2056 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
2057 *(u16
*)&caps
[14] = speed
;
2058 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
2061 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2062 "(assuming 650KB/sec)\n", drive
->name
);
2063 *(u16
*)&caps
[14] = 650;
2066 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2067 "(assuming 650KB/sec)\n", drive
->name
);
2068 *(u16
*)&caps
[8] = 650;
2071 memcpy(&tape
->caps
, caps
, 20);
2073 /* device lacks locking support according to capabilities page */
2074 if ((caps
[6] & 1) == 0)
2075 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
2078 tape
->blk_size
= 512;
2079 else if (caps
[7] & 0x04)
2080 tape
->blk_size
= 1024;
2083 #ifdef CONFIG_IDE_PROC_FS
2084 #define ide_tape_devset_get(name, field) \
2085 static int get_##name(ide_drive_t *drive) \
2087 idetape_tape_t *tape = drive->driver_data; \
2088 return tape->field; \
2091 #define ide_tape_devset_set(name, field) \
2092 static int set_##name(ide_drive_t *drive, int arg) \
2094 idetape_tape_t *tape = drive->driver_data; \
2095 tape->field = arg; \
2099 #define ide_tape_devset_rw_field(_name, _field) \
2100 ide_tape_devset_get(_name, _field) \
2101 ide_tape_devset_set(_name, _field) \
2102 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2104 #define ide_tape_devset_r_field(_name, _field) \
2105 ide_tape_devset_get(_name, _field) \
2106 IDE_DEVSET(_name, 0, get_##_name, NULL)
2108 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
2109 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
2110 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
2111 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
2113 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
2115 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
2116 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2118 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2119 ide_tape_devset_r_field(speed
, caps
[14]);
2120 ide_tape_devset_r_field(buffer
, caps
[16]);
2121 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2123 static const struct ide_proc_devset idetape_settings
[] = {
2124 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2125 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2126 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2127 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2128 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2129 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2130 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2131 mulf_tdsc
, divf_tdsc
),
2137 * The function below is called to:
2139 * 1. Initialize our various state variables.
2140 * 2. Ask the tape for its capabilities.
2141 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2142 * is chosen based on the recommendation which we received in step 2.
2144 * Note that at this point ide.c already assigned us an irq, so that we can
2145 * queue requests here and wait for their completion.
2147 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2152 u16
*ctl
= (u16
*)&tape
->caps
[12];
2154 drive
->pc_callback
= ide_tape_callback
;
2155 drive
->pc_update_buffers
= idetape_update_buffers
;
2156 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2158 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2160 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2161 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2163 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2166 /* Seagate Travan drives do not support DSC overlap. */
2167 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2168 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2170 tape
->minor
= minor
;
2171 tape
->name
[0] = 'h';
2172 tape
->name
[1] = 't';
2173 tape
->name
[2] = '0' + minor
;
2174 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2176 idetape_get_inquiry_results(drive
);
2177 idetape_get_mode_sense_results(drive
);
2178 ide_tape_get_bsize_from_bdesc(drive
);
2179 tape
->user_bs_factor
= 1;
2180 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2181 while (tape
->buffer_size
> 0xffff) {
2182 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2184 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2186 buffer_size
= tape
->buffer_size
;
2187 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2188 if (buffer_size
% PAGE_SIZE
) {
2189 tape
->pages_per_buffer
++;
2190 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2193 /* select the "best" DSC read/write polling freq */
2194 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2196 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2199 * Ensure that the number we got makes sense; limit it within
2200 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2202 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2203 IDETAPE_DSC_RW_MAX
);
2204 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2206 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2207 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2208 tape
->buffer_size
/ 1024,
2209 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2210 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2212 ide_proc_register_driver(drive
, tape
->driver
);
2215 static void ide_tape_remove(ide_drive_t
*drive
)
2217 idetape_tape_t
*tape
= drive
->driver_data
;
2219 ide_proc_unregister_driver(drive
, tape
->driver
);
2220 device_del(&tape
->dev
);
2221 ide_unregister_region(tape
->disk
);
2223 mutex_lock(&idetape_ref_mutex
);
2224 put_device(&tape
->dev
);
2225 mutex_unlock(&idetape_ref_mutex
);
2228 static void ide_tape_release(struct device
*dev
)
2230 struct ide_tape_obj
*tape
= to_ide_drv(dev
, ide_tape_obj
);
2231 ide_drive_t
*drive
= tape
->drive
;
2232 struct gendisk
*g
= tape
->disk
;
2234 BUG_ON(tape
->merge_bh_size
);
2236 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2237 drive
->driver_data
= NULL
;
2238 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2239 device_destroy(idetape_sysfs_class
,
2240 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2241 idetape_devs
[tape
->minor
] = NULL
;
2242 g
->private_data
= NULL
;
2247 #ifdef CONFIG_IDE_PROC_FS
2248 static int proc_idetape_read_name
2249 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2251 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2252 idetape_tape_t
*tape
= drive
->driver_data
;
2256 len
= sprintf(out
, "%s\n", tape
->name
);
2257 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2260 static ide_proc_entry_t idetape_proc
[] = {
2261 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2262 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2263 { NULL
, 0, NULL
, NULL
}
2266 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2268 return idetape_proc
;
2271 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2273 return idetape_settings
;
2277 static int ide_tape_probe(ide_drive_t
*);
2279 static struct ide_driver idetape_driver
= {
2281 .owner
= THIS_MODULE
,
2283 .bus
= &ide_bus_type
,
2285 .probe
= ide_tape_probe
,
2286 .remove
= ide_tape_remove
,
2287 .version
= IDETAPE_VERSION
,
2288 .do_request
= idetape_do_request
,
2289 #ifdef CONFIG_IDE_PROC_FS
2290 .proc_entries
= ide_tape_proc_entries
,
2291 .proc_devsets
= ide_tape_proc_devsets
,
2295 /* Our character device supporting functions, passed to register_chrdev. */
2296 static const struct file_operations idetape_fops
= {
2297 .owner
= THIS_MODULE
,
2298 .read
= idetape_chrdev_read
,
2299 .write
= idetape_chrdev_write
,
2300 .ioctl
= idetape_chrdev_ioctl
,
2301 .open
= idetape_chrdev_open
,
2302 .release
= idetape_chrdev_release
,
2305 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
2307 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
2315 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
2317 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
2323 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
2324 unsigned int cmd
, unsigned long arg
)
2326 struct ide_tape_obj
*tape
= ide_drv_g(bdev
->bd_disk
, ide_tape_obj
);
2327 ide_drive_t
*drive
= tape
->drive
;
2328 int err
= generic_ide_ioctl(drive
, bdev
, cmd
, arg
);
2330 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2334 static struct block_device_operations idetape_block_ops
= {
2335 .owner
= THIS_MODULE
,
2336 .open
= idetape_open
,
2337 .release
= idetape_release
,
2338 .locked_ioctl
= idetape_ioctl
,
2341 static int ide_tape_probe(ide_drive_t
*drive
)
2343 idetape_tape_t
*tape
;
2347 if (!strstr("ide-tape", drive
->driver_req
))
2350 if (drive
->media
!= ide_tape
)
2353 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
2354 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
2355 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2356 " the driver\n", drive
->name
);
2359 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2361 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2366 g
= alloc_disk(1 << PARTN_BITS
);
2370 ide_init_disk(g
, drive
);
2372 tape
->dev
.parent
= &drive
->gendev
;
2373 tape
->dev
.release
= ide_tape_release
;
2374 dev_set_name(&tape
->dev
, dev_name(&drive
->gendev
));
2376 if (device_register(&tape
->dev
))
2379 tape
->drive
= drive
;
2380 tape
->driver
= &idetape_driver
;
2383 g
->private_data
= &tape
->driver
;
2385 drive
->driver_data
= tape
;
2387 mutex_lock(&idetape_ref_mutex
);
2388 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2390 idetape_devs
[minor
] = tape
;
2391 mutex_unlock(&idetape_ref_mutex
);
2393 idetape_setup(drive
, tape
, minor
);
2395 device_create(idetape_sysfs_class
, &drive
->gendev
,
2396 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
2397 device_create(idetape_sysfs_class
, &drive
->gendev
,
2398 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2401 g
->fops
= &idetape_block_ops
;
2402 ide_register_region(g
);
2414 static void __exit
idetape_exit(void)
2416 driver_unregister(&idetape_driver
.gen_driver
);
2417 class_destroy(idetape_sysfs_class
);
2418 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2421 static int __init
idetape_init(void)
2424 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2425 if (IS_ERR(idetape_sysfs_class
)) {
2426 idetape_sysfs_class
= NULL
;
2427 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2432 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2433 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2436 goto out_free_class
;
2439 error
= driver_register(&idetape_driver
.gen_driver
);
2441 goto out_free_driver
;
2446 driver_unregister(&idetape_driver
.gen_driver
);
2448 class_destroy(idetape_sysfs_class
);
2453 MODULE_ALIAS("ide:*m-tape*");
2454 module_init(idetape_init
);
2455 module_exit(idetape_exit
);
2456 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2457 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2458 MODULE_LICENSE("GPL");