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),
140 /* Tape door status */
141 #define DOOR_UNLOCKED 0
142 #define DOOR_LOCKED 1
143 #define DOOR_EXPLICITLY_LOCKED 2
145 /* Some defines for the SPACE command */
146 #define IDETAPE_SPACE_OVER_FILEMARK 1
147 #define IDETAPE_SPACE_TO_EOD 3
149 /* Some defines for the LOAD UNLOAD command */
150 #define IDETAPE_LU_LOAD_MASK 1
151 #define IDETAPE_LU_RETENSION_MASK 2
152 #define IDETAPE_LU_EOT_MASK 4
154 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
155 #define IDETAPE_BLOCK_DESCRIPTOR 0
156 #define IDETAPE_CAPABILITIES_PAGE 0x2a
159 * Most of our global data which we need to save even as we leave the driver due
160 * to an interrupt or a timer event is stored in the struct defined below.
162 typedef struct ide_tape_obj
{
164 struct ide_driver
*driver
;
165 struct gendisk
*disk
;
168 /* used by REQ_IDETAPE_{READ,WRITE} requests */
169 struct ide_atapi_pc queued_pc
;
172 * DSC polling variables.
174 * While polling for DSC we use postponed_rq to postpone the current
175 * request so that ide.c will be able to service pending requests on the
176 * other device. Note that at most we will have only one DSC (usually
177 * data transfer) request in the device request queue.
179 struct request
*postponed_rq
;
180 /* The time in which we started polling for DSC */
181 unsigned long dsc_polling_start
;
182 /* Timer used to poll for dsc */
183 struct timer_list dsc_timer
;
184 /* Read/Write dsc polling frequency */
185 unsigned long best_dsc_rw_freq
;
186 unsigned long dsc_poll_freq
;
187 unsigned long dsc_timeout
;
189 /* Read position information */
192 unsigned int first_frame
;
194 /* Last error information */
195 u8 sense_key
, asc
, ascq
;
197 /* Character device operation */
201 /* Current character device data transfer direction */
204 /* tape block size, usually 512 or 1024 bytes */
205 unsigned short blk_size
;
208 /* Copy of the tape's Capabilities and Mechanical Page */
212 * Active data transfer request parameters.
214 * At most, there is only one ide-tape originated data transfer request
215 * in the device request queue. This allows ide.c to easily service
216 * requests from the other device when we postpone our active request.
219 /* Data buffer size chosen based on the tape's recommendation */
222 struct idetape_bh
*merge_bh
;
223 /* size of the merge buffer */
225 /* pointer to current buffer head within the merge buffer */
226 struct idetape_bh
*bh
;
230 /* Measures average tape speed */
231 unsigned long avg_time
;
235 /* the door is currently locked */
237 /* the tape hardware is write protected */
239 /* the tape is write protected (hardware or opened as read-only) */
245 static DEFINE_MUTEX(idetape_ref_mutex
);
247 static struct class *idetape_sysfs_class
;
249 static void ide_tape_release(struct device
*);
251 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
253 struct ide_tape_obj
*tape
= NULL
;
255 mutex_lock(&idetape_ref_mutex
);
256 tape
= ide_drv_g(disk
, ide_tape_obj
);
258 if (ide_device_get(tape
->drive
))
261 get_device(&tape
->dev
);
263 mutex_unlock(&idetape_ref_mutex
);
267 static void ide_tape_put(struct ide_tape_obj
*tape
)
269 ide_drive_t
*drive
= tape
->drive
;
271 mutex_lock(&idetape_ref_mutex
);
272 put_device(&tape
->dev
);
273 ide_device_put(drive
);
274 mutex_unlock(&idetape_ref_mutex
);
278 * The variables below are used for the character device interface. Additional
279 * state variables are defined in our ide_drive_t structure.
281 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
283 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
285 struct ide_tape_obj
*tape
= NULL
;
287 mutex_lock(&idetape_ref_mutex
);
288 tape
= idetape_devs
[i
];
290 get_device(&tape
->dev
);
291 mutex_unlock(&idetape_ref_mutex
);
295 static int idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
298 struct idetape_bh
*bh
= pc
->bh
;
303 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
305 drive
->hwif
->tp_ops
->input_data(drive
, NULL
, bh
->b_data
+
306 atomic_read(&bh
->b_count
), count
);
308 atomic_add(count
, &bh
->b_count
);
309 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
316 static int idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
319 struct idetape_bh
*bh
= pc
->bh
;
323 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
324 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, pc
->b_data
, count
);
327 pc
->b_count
-= count
;
335 static void idetape_update_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
337 struct idetape_bh
*bh
= pc
->bh
;
338 unsigned int bcount
= pc
->xferred
;
340 if (pc
->flags
& PC_FLAG_WRITING
)
343 if (bh
== NULL
|| bcount
> bh
->b_size
) {
344 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
348 atomic_set(&bh
->b_count
, bcount
);
349 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
355 * called on each failed packet command retry to analyze the request sense. We
356 * currently do not utilize this information.
358 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
360 idetape_tape_t
*tape
= drive
->driver_data
;
361 struct ide_atapi_pc
*pc
= drive
->failed_pc
;
363 tape
->sense_key
= sense
[2] & 0xF;
364 tape
->asc
= sense
[12];
365 tape
->ascq
= sense
[13];
367 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
368 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
370 /* Correct pc->xferred by asking the tape. */
371 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
372 pc
->xferred
= pc
->req_xfer
-
374 get_unaligned_be32(&sense
[3]);
375 idetape_update_buffers(drive
, pc
);
379 * If error was the result of a zero-length read or write command,
380 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
381 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
383 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
385 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
386 if (tape
->sense_key
== 5) {
387 /* don't report an error, everything's ok */
389 /* don't retry read/write */
390 pc
->flags
|= PC_FLAG_ABORT
;
393 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
394 pc
->error
= IDE_DRV_ERROR_FILEMARK
;
395 pc
->flags
|= PC_FLAG_ABORT
;
397 if (pc
->c
[0] == WRITE_6
) {
398 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
399 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
400 pc
->error
= IDE_DRV_ERROR_EOD
;
401 pc
->flags
|= PC_FLAG_ABORT
;
404 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
405 if (tape
->sense_key
== 8) {
406 pc
->error
= IDE_DRV_ERROR_EOD
;
407 pc
->flags
|= PC_FLAG_ABORT
;
409 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
411 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
415 /* Free data buffers completely. */
416 static void ide_tape_kfree_buffer(idetape_tape_t
*tape
)
418 struct idetape_bh
*bh
= tape
->merge_bh
;
424 static void ide_tape_handle_dsc(ide_drive_t
*);
426 static int ide_tape_callback(ide_drive_t
*drive
, int dsc
)
428 idetape_tape_t
*tape
= drive
->driver_data
;
429 struct ide_atapi_pc
*pc
= drive
->pc
;
430 struct request
*rq
= drive
->hwif
->rq
;
431 int uptodate
= pc
->error
? 0 : 1;
432 int err
= uptodate
? 0 : IDE_DRV_ERROR_GENERAL
;
434 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
437 ide_tape_handle_dsc(drive
);
439 if (drive
->failed_pc
== pc
)
440 drive
->failed_pc
= NULL
;
442 if (pc
->c
[0] == REQUEST_SENSE
) {
444 idetape_analyze_error(drive
, pc
->buf
);
446 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE "
447 "itself - Aborting request!\n");
448 } else if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
449 int blocks
= pc
->xferred
/ tape
->blk_size
;
451 tape
->avg_size
+= blocks
* tape
->blk_size
;
453 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
454 tape
->avg_speed
= tape
->avg_size
* HZ
/
455 (jiffies
- tape
->avg_time
) / 1024;
457 tape
->avg_time
= jiffies
;
460 tape
->first_frame
+= blocks
;
461 rq
->current_nr_sectors
-= blocks
;
467 } else if (pc
->c
[0] == READ_POSITION
&& uptodate
) {
468 u8
*readpos
= pc
->buf
;
470 debug_log(DBG_SENSE
, "BOP - %s\n",
471 (readpos
[0] & 0x80) ? "Yes" : "No");
472 debug_log(DBG_SENSE
, "EOP - %s\n",
473 (readpos
[0] & 0x40) ? "Yes" : "No");
475 if (readpos
[0] & 0x4) {
476 printk(KERN_INFO
"ide-tape: Block location is unknown"
478 clear_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
480 err
= IDE_DRV_ERROR_GENERAL
;
482 debug_log(DBG_SENSE
, "Block Location - %u\n",
483 be32_to_cpup((__be32
*)&readpos
[4]));
485 tape
->partition
= readpos
[1];
486 tape
->first_frame
= be32_to_cpup((__be32
*)&readpos
[4]);
487 set_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
497 * Postpone the current request so that ide.c will be able to service requests
498 * from another device on the same port while we are polling for DSC.
500 static void idetape_postpone_request(ide_drive_t
*drive
)
502 idetape_tape_t
*tape
= drive
->driver_data
;
504 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
506 tape
->postponed_rq
= drive
->hwif
->rq
;
508 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
511 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
513 idetape_tape_t
*tape
= drive
->driver_data
;
515 /* Media access command */
516 tape
->dsc_polling_start
= jiffies
;
517 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
518 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
519 /* Allow ide.c to handle other requests */
520 idetape_postpone_request(drive
);
523 static int ide_tape_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
524 unsigned int bcount
, int write
)
529 bleft
= idetape_output_buffers(drive
, pc
, bcount
);
531 bleft
= idetape_input_buffers(drive
, pc
, bcount
);
533 return bcount
- bleft
;
537 * Packet Command Interface
539 * The current Packet Command is available in drive->pc, and will not change
540 * until we finish handling it. Each packet command is associated with a
541 * callback function that will be called when the command is finished.
543 * The handling will be done in three stages:
545 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
546 * the interrupt handler to ide_pc_intr.
548 * 2. On each interrupt, ide_pc_intr will be called. This step will be
549 * repeated until the device signals us that no more interrupts will be issued.
551 * 3. ATAPI Tape media access commands have immediate status with a delayed
552 * process. In case of a successful initiation of a media access packet command,
553 * the DSC bit will be set when the actual execution of the command is finished.
554 * Since the tape drive will not issue an interrupt, we have to poll for this
555 * event. In this case, we define the request as "low priority request" by
556 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
559 * ide.c will then give higher priority to requests which originate from the
560 * other device, until will change rq_status to RQ_ACTIVE.
562 * 4. When the packet command is finished, it will be checked for errors.
564 * 5. In case an error was found, we queue a request sense packet command in
565 * front of the request queue and retry the operation up to
566 * IDETAPE_MAX_PC_RETRIES times.
568 * 6. In case no error was found, or we decided to give up and not to retry
569 * again, the callback function will be called and then we will handle the next
573 static ide_startstop_t
ide_tape_issue_pc(ide_drive_t
*drive
,
575 struct ide_atapi_pc
*pc
)
577 idetape_tape_t
*tape
= drive
->driver_data
;
579 if (drive
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
580 drive
->failed_pc
= pc
;
582 /* Set the current packet command */
585 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
586 (pc
->flags
& PC_FLAG_ABORT
)) {
587 unsigned int done
= blk_rq_bytes(drive
->hwif
->rq
);
590 * We will "abort" retrying a packet command in case legitimate
591 * error code was received (crossing a filemark, or end of the
592 * media, for example).
594 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
595 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
596 tape
->sense_key
== 2 && tape
->asc
== 4 &&
597 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
598 printk(KERN_ERR
"ide-tape: %s: I/O error, "
599 "pc = %2x, key = %2x, "
600 "asc = %2x, ascq = %2x\n",
601 tape
->name
, pc
->c
[0],
602 tape
->sense_key
, tape
->asc
,
606 pc
->error
= IDE_DRV_ERROR_GENERAL
;
609 drive
->failed_pc
= NULL
;
610 drive
->pc_callback(drive
, 0);
611 ide_complete_rq(drive
, -EIO
, done
);
614 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
618 return ide_issue_pc(drive
, cmd
);
621 /* A mode sense command is used to "sense" tape parameters. */
622 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
625 pc
->c
[0] = MODE_SENSE
;
626 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
627 /* DBD = 1 - Don't return block descriptors */
629 pc
->c
[2] = page_code
;
631 * Changed pc->c[3] to 0 (255 will at best return unused info).
633 * For SCSI this byte is defined as subpage instead of high byte
634 * of length and some IDE drives seem to interpret it this way
635 * and return an error when 255 is used.
638 /* We will just discard data in that case */
640 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
642 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
648 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
650 ide_hwif_t
*hwif
= drive
->hwif
;
651 idetape_tape_t
*tape
= drive
->driver_data
;
652 struct ide_atapi_pc
*pc
= drive
->pc
;
655 stat
= hwif
->tp_ops
->read_status(hwif
);
657 if (stat
& ATA_DSC
) {
658 if (stat
& ATA_ERR
) {
660 if (pc
->c
[0] != TEST_UNIT_READY
)
661 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
663 /* Retry operation */
669 pc
->error
= IDE_DRV_ERROR_GENERAL
;
670 drive
->failed_pc
= NULL
;
672 drive
->pc_callback(drive
, 0);
676 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
677 struct ide_atapi_pc
*pc
, struct request
*rq
,
680 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
681 unsigned int length
= rq
->current_nr_sectors
;
684 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
688 pc
->buf_size
= length
* tape
->blk_size
;
689 pc
->req_xfer
= pc
->buf_size
;
690 if (pc
->req_xfer
== tape
->buffer_size
)
691 pc
->flags
|= PC_FLAG_DMA_OK
;
693 if (opcode
== READ_6
) {
695 atomic_set(&bh
->b_count
, 0);
696 } else if (opcode
== WRITE_6
) {
698 pc
->flags
|= PC_FLAG_WRITING
;
699 pc
->b_data
= bh
->b_data
;
700 pc
->b_count
= atomic_read(&bh
->b_count
);
703 memcpy(rq
->cmd
, pc
->c
, 12);
706 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
707 struct request
*rq
, sector_t block
)
709 ide_hwif_t
*hwif
= drive
->hwif
;
710 idetape_tape_t
*tape
= drive
->driver_data
;
711 struct ide_atapi_pc
*pc
= NULL
;
712 struct request
*postponed_rq
= tape
->postponed_rq
;
716 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
717 " current_nr_sectors: %u\n",
718 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
719 rq
->current_nr_sectors
);
721 if (!(blk_special_request(rq
) || blk_sense_request(rq
))) {
722 /* We do not support buffer cache originated requests. */
723 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
724 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
725 if (blk_fs_request(rq
) == 0 && rq
->errors
== 0)
727 ide_complete_rq(drive
, -EIO
, ide_rq_bytes(rq
));
731 /* Retry a failed packet command */
732 if (drive
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
733 pc
= drive
->failed_pc
;
737 if (postponed_rq
!= NULL
)
738 if (rq
!= postponed_rq
) {
739 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
740 "Two DSC requests were queued\n");
741 drive
->failed_pc
= NULL
;
743 ide_complete_rq(drive
, 0, blk_rq_bytes(rq
));
747 tape
->postponed_rq
= NULL
;
750 * If the tape is still busy, postpone our request and service
751 * the other device meanwhile.
753 stat
= hwif
->tp_ops
->read_status(hwif
);
755 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
756 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
757 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
759 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
760 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
761 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
764 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
765 (stat
& ATA_DSC
) == 0) {
766 if (postponed_rq
== NULL
) {
767 tape
->dsc_polling_start
= jiffies
;
768 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
769 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
770 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
771 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
773 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
774 idetape_media_access_finished(drive
);
777 return ide_do_reset(drive
);
779 } else if (time_after(jiffies
,
780 tape
->dsc_polling_start
+
781 IDETAPE_DSC_MA_THRESHOLD
))
782 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
783 idetape_postpone_request(drive
);
786 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
787 pc
= &tape
->queued_pc
;
788 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
791 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
792 pc
= &tape
->queued_pc
;
793 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
796 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
797 pc
= (struct ide_atapi_pc
*)rq
->special
;
798 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
799 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
802 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
803 idetape_media_access_finished(drive
);
809 /* prepare sense request for this command */
810 ide_prep_sense(drive
, rq
);
812 memset(&cmd
, 0, sizeof(cmd
));
815 cmd
.tf_flags
|= IDE_TFLAG_WRITE
;
819 ide_init_sg_cmd(&cmd
, pc
->req_xfer
);
820 ide_map_sg(drive
, &cmd
);
822 return ide_tape_issue_pc(drive
, &cmd
, pc
);
826 * It returns a pointer to the newly allocated buffer, or NULL in case
829 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
832 struct idetape_bh
*bh
;
834 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
838 bh
->b_data
= kmalloc(tape
->buffer_size
, GFP_KERNEL
);
844 bh
->b_size
= tape
->buffer_size
;
845 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
850 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
851 const char __user
*buf
, int n
)
853 struct idetape_bh
*bh
= tape
->bh
;
857 if (bh
== NULL
|| n
> bh
->b_size
- atomic_read(&bh
->b_count
)) {
858 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
862 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
865 atomic_add(n
, &bh
->b_count
);
866 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
873 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
876 struct idetape_bh
*bh
= tape
->bh
;
880 if (bh
== NULL
|| n
> tape
->b_count
) {
881 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
885 if (copy_to_user(buf
, tape
->b_data
, n
))
895 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
897 struct idetape_bh
*bh
= tape
->merge_bh
;
898 tape
->bh
= tape
->merge_bh
;
900 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
901 atomic_set(&bh
->b_count
, 0);
903 tape
->b_data
= bh
->b_data
;
904 tape
->b_count
= atomic_read(&bh
->b_count
);
909 * Write a filemark if write_filemark=1. Flush the device buffers without
910 * writing a filemark otherwise.
912 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
913 struct ide_atapi_pc
*pc
, int write_filemark
)
916 pc
->c
[0] = WRITE_FILEMARKS
;
917 pc
->c
[4] = write_filemark
;
918 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
921 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
923 idetape_tape_t
*tape
= drive
->driver_data
;
924 struct gendisk
*disk
= tape
->disk
;
925 int load_attempted
= 0;
927 /* Wait for the tape to become ready */
928 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
930 while (time_before(jiffies
, timeout
)) {
931 if (ide_do_test_unit_ready(drive
, disk
) == 0)
933 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
934 || (tape
->asc
== 0x3A)) {
938 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
940 /* not about to be ready */
941 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
942 (tape
->ascq
== 1 || tape
->ascq
== 8)))
949 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
951 struct ide_tape_obj
*tape
= drive
->driver_data
;
952 struct ide_atapi_pc pc
;
955 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
956 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
959 idetape_wait_ready(drive
, 60 * 5 * HZ
);
963 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
966 pc
->c
[0] = READ_POSITION
;
970 static int idetape_read_position(ide_drive_t
*drive
)
972 idetape_tape_t
*tape
= drive
->driver_data
;
973 struct ide_atapi_pc pc
;
976 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
978 idetape_create_read_position_cmd(&pc
);
979 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
981 position
= tape
->first_frame
;
985 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
986 struct ide_atapi_pc
*pc
,
987 unsigned int block
, u8 partition
, int skip
)
990 pc
->c
[0] = POSITION_TO_ELEMENT
;
992 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
993 pc
->c
[8] = partition
;
994 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
997 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
999 idetape_tape_t
*tape
= drive
->driver_data
;
1001 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1004 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1005 tape
->merge_bh_size
= 0;
1006 if (tape
->merge_bh
!= NULL
) {
1007 ide_tape_kfree_buffer(tape
);
1008 tape
->merge_bh
= NULL
;
1011 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1015 * Position the tape to the requested block using the LOCATE packet command.
1016 * A READ POSITION command is then issued to check where we are positioned. Like
1017 * all higher level operations, we queue the commands at the tail of the request
1018 * queue and wait for their completion.
1020 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1021 u8 partition
, int skip
)
1023 idetape_tape_t
*tape
= drive
->driver_data
;
1024 struct gendisk
*disk
= tape
->disk
;
1026 struct ide_atapi_pc pc
;
1028 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1029 __ide_tape_discard_merge_buffer(drive
);
1030 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1031 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1032 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1036 idetape_create_read_position_cmd(&pc
);
1037 return ide_queue_pc_tail(drive
, disk
, &pc
);
1040 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1041 int restore_position
)
1043 idetape_tape_t
*tape
= drive
->driver_data
;
1046 __ide_tape_discard_merge_buffer(drive
);
1047 if (restore_position
) {
1048 position
= idetape_read_position(drive
);
1049 seek
= position
> 0 ? position
: 0;
1050 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1051 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1052 " %s\n", tape
->name
, __func__
);
1059 * Generate a read/write request for the block device interface and wait for it
1062 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1063 struct idetape_bh
*bh
)
1065 idetape_tape_t
*tape
= drive
->driver_data
;
1069 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1071 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1072 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1074 rq
->rq_disk
= tape
->disk
;
1075 rq
->special
= (void *)bh
;
1076 rq
->sector
= tape
->first_frame
;
1077 rq
->nr_sectors
= blocks
;
1078 rq
->current_nr_sectors
= blocks
;
1079 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1081 errors
= rq
->errors
;
1082 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1083 blk_put_request(rq
);
1085 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1089 idetape_init_merge_buffer(tape
);
1090 if (errors
== IDE_DRV_ERROR_GENERAL
)
1095 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1103 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1104 struct ide_atapi_pc
*pc
)
1107 pc
->c
[0] = REZERO_UNIT
;
1108 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1111 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1116 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1119 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1123 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1125 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1128 /* Queue up a character device originated write request. */
1129 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1131 idetape_tape_t
*tape
= drive
->driver_data
;
1133 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1135 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1136 blocks
, tape
->merge_bh
);
1139 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1141 idetape_tape_t
*tape
= drive
->driver_data
;
1143 struct idetape_bh
*bh
;
1145 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1146 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1147 " but we are not writing.\n");
1150 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1151 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1152 tape
->merge_bh_size
= tape
->buffer_size
;
1154 if (tape
->merge_bh_size
) {
1155 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1156 if (tape
->merge_bh_size
% tape
->blk_size
) {
1157 unsigned int i
= tape
->blk_size
-
1158 tape
->merge_bh_size
% tape
->blk_size
;
1162 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1164 atomic_add(i
, &bh
->b_count
);
1166 printk(KERN_INFO
"ide-tape: bug, bh NULL\n");
1168 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1169 tape
->merge_bh_size
= 0;
1171 if (tape
->merge_bh
!= NULL
) {
1172 ide_tape_kfree_buffer(tape
);
1173 tape
->merge_bh
= NULL
;
1175 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1178 static int idetape_init_read(ide_drive_t
*drive
)
1180 idetape_tape_t
*tape
= drive
->driver_data
;
1183 /* Initialize read operation */
1184 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1185 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1186 ide_tape_flush_merge_buffer(drive
);
1187 idetape_flush_tape_buffers(drive
);
1189 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1190 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1192 tape
->merge_bh_size
= 0;
1194 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0);
1195 if (!tape
->merge_bh
)
1197 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1200 * Issue a read 0 command to ensure that DSC handshake is
1201 * switched from completion mode to buffer available mode.
1202 * No point in issuing this if DSC overlap isn't supported, some
1203 * drives (Seagate STT3401A) will return an error.
1205 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1206 bytes_read
= idetape_queue_rw_tail(drive
,
1207 REQ_IDETAPE_READ
, 0,
1209 if (bytes_read
< 0) {
1210 ide_tape_kfree_buffer(tape
);
1211 tape
->merge_bh
= NULL
;
1212 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1221 /* called from idetape_chrdev_read() to service a chrdev read request. */
1222 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1224 idetape_tape_t
*tape
= drive
->driver_data
;
1226 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1228 /* If we are at a filemark, return a read length of 0 */
1229 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1232 idetape_init_read(drive
);
1234 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1238 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1240 idetape_tape_t
*tape
= drive
->driver_data
;
1241 struct idetape_bh
*bh
= tape
->merge_bh
;
1247 count
= min(tape
->buffer_size
, bcount
);
1249 blocks
= count
/ tape
->blk_size
;
1250 atomic_set(&bh
->b_count
, count
);
1251 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1253 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1259 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1260 * currently support only one partition.
1262 static int idetape_rewind_tape(ide_drive_t
*drive
)
1264 struct ide_tape_obj
*tape
= drive
->driver_data
;
1265 struct gendisk
*disk
= tape
->disk
;
1267 struct ide_atapi_pc pc
;
1269 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1271 idetape_create_rewind_cmd(drive
, &pc
);
1272 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1276 idetape_create_read_position_cmd(&pc
);
1277 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1283 /* mtio.h compatible commands should be issued to the chrdev interface. */
1284 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1287 idetape_tape_t
*tape
= drive
->driver_data
;
1288 void __user
*argp
= (void __user
*)arg
;
1290 struct idetape_config
{
1291 int dsc_rw_frequency
;
1292 int dsc_media_access_frequency
;
1296 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1300 if (copy_from_user(&config
, argp
, sizeof(config
)))
1302 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1305 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1306 config
.nr_stages
= 1;
1307 if (copy_to_user(argp
, &config
, sizeof(config
)))
1316 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1319 idetape_tape_t
*tape
= drive
->driver_data
;
1320 struct gendisk
*disk
= tape
->disk
;
1321 struct ide_atapi_pc pc
;
1322 int retval
, count
= 0;
1323 int sprev
= !!(tape
->caps
[4] & 0x20);
1327 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1330 mt_count
= -mt_count
;
1333 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1334 tape
->merge_bh_size
= 0;
1335 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1337 ide_tape_discard_merge_buffer(drive
, 0);
1343 idetape_create_space_cmd(&pc
, mt_count
- count
,
1344 IDETAPE_SPACE_OVER_FILEMARK
);
1345 return ide_queue_pc_tail(drive
, disk
, &pc
);
1350 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1354 count
= (MTBSFM
== mt_op
? 1 : -1);
1355 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1357 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1364 * Our character device read / write functions.
1366 * The tape is optimized to maximize throughput when it is transferring an
1367 * integral number of the "continuous transfer limit", which is a parameter of
1368 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1370 * As of version 1.3 of the driver, the character device provides an abstract
1371 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1372 * same backup/restore procedure is supported. The driver will internally
1373 * convert the requests to the recommended transfer unit, so that an unmatch
1374 * between the user's block size to the recommended size will only result in a
1375 * (slightly) increased driver overhead, but will no longer hit performance.
1376 * This is not applicable to Onstream.
1378 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1379 size_t count
, loff_t
*ppos
)
1381 struct ide_tape_obj
*tape
= file
->private_data
;
1382 ide_drive_t
*drive
= tape
->drive
;
1383 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1385 u16 ctl
= *(u16
*)&tape
->caps
[12];
1387 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1389 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1390 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1391 if (count
> tape
->blk_size
&&
1392 (count
% tape
->blk_size
) == 0)
1393 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1395 rc
= idetape_init_read(drive
);
1400 if (tape
->merge_bh_size
) {
1401 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1402 (unsigned int)count
);
1403 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1405 buf
+= actually_read
;
1406 tape
->merge_bh_size
-= actually_read
;
1407 count
-= actually_read
;
1409 while (count
>= tape
->buffer_size
) {
1410 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1411 if (bytes_read
<= 0)
1413 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1416 count
-= bytes_read
;
1417 actually_read
+= bytes_read
;
1420 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1421 if (bytes_read
<= 0)
1423 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1424 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1426 actually_read
+= temp
;
1427 tape
->merge_bh_size
= bytes_read
-temp
;
1430 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1431 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1433 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1437 return ret
? ret
: actually_read
;
1440 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1441 size_t count
, loff_t
*ppos
)
1443 struct ide_tape_obj
*tape
= file
->private_data
;
1444 ide_drive_t
*drive
= tape
->drive
;
1445 ssize_t actually_written
= 0;
1447 u16 ctl
= *(u16
*)&tape
->caps
[12];
1449 /* The drive is write protected. */
1450 if (tape
->write_prot
)
1453 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1455 /* Initialize write operation */
1456 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1457 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1458 ide_tape_discard_merge_buffer(drive
, 1);
1459 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1460 printk(KERN_ERR
"ide-tape: merge_bh_size "
1461 "should be 0 now\n");
1462 tape
->merge_bh_size
= 0;
1464 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0);
1465 if (!tape
->merge_bh
)
1467 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1468 idetape_init_merge_buffer(tape
);
1471 * Issue a write 0 command to ensure that DSC handshake is
1472 * switched from completion mode to buffer available mode. No
1473 * point in issuing this if DSC overlap isn't supported, some
1474 * drives (Seagate STT3401A) will return an error.
1476 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1477 ssize_t retval
= idetape_queue_rw_tail(drive
,
1478 REQ_IDETAPE_WRITE
, 0,
1481 ide_tape_kfree_buffer(tape
);
1482 tape
->merge_bh
= NULL
;
1483 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1490 if (tape
->merge_bh_size
) {
1491 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1492 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1493 tape
->merge_bh_size
= 0;
1495 actually_written
= min((unsigned int)
1496 (tape
->buffer_size
- tape
->merge_bh_size
),
1497 (unsigned int)count
);
1498 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1500 buf
+= actually_written
;
1501 tape
->merge_bh_size
+= actually_written
;
1502 count
-= actually_written
;
1504 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1506 tape
->merge_bh_size
= 0;
1507 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1512 while (count
>= tape
->buffer_size
) {
1514 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1516 buf
+= tape
->buffer_size
;
1517 count
-= tape
->buffer_size
;
1518 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1519 actually_written
+= tape
->buffer_size
;
1524 actually_written
+= count
;
1525 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1527 tape
->merge_bh_size
+= count
;
1529 return ret
? ret
: actually_written
;
1532 static int idetape_write_filemark(ide_drive_t
*drive
)
1534 struct ide_tape_obj
*tape
= drive
->driver_data
;
1535 struct ide_atapi_pc pc
;
1537 /* Write a filemark */
1538 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1539 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1540 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1547 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1550 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1551 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1552 * usually not supported.
1554 * The following commands are currently not supported:
1556 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1557 * MT_ST_WRITE_THRESHOLD.
1559 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1561 idetape_tape_t
*tape
= drive
->driver_data
;
1562 struct gendisk
*disk
= tape
->disk
;
1563 struct ide_atapi_pc pc
;
1566 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1576 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1583 if (tape
->write_prot
)
1585 ide_tape_discard_merge_buffer(drive
, 1);
1586 for (i
= 0; i
< mt_count
; i
++) {
1587 retval
= idetape_write_filemark(drive
);
1593 ide_tape_discard_merge_buffer(drive
, 0);
1594 if (idetape_rewind_tape(drive
))
1598 ide_tape_discard_merge_buffer(drive
, 0);
1599 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1603 * If door is locked, attempt to unlock before
1604 * attempting to eject.
1606 if (tape
->door_locked
) {
1607 if (!ide_set_media_lock(drive
, disk
, 0))
1608 tape
->door_locked
= DOOR_UNLOCKED
;
1610 ide_tape_discard_merge_buffer(drive
, 0);
1611 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1613 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1616 ide_tape_discard_merge_buffer(drive
, 0);
1617 return idetape_flush_tape_buffers(drive
);
1619 ide_tape_discard_merge_buffer(drive
, 0);
1620 return ide_do_start_stop(drive
, disk
,
1621 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1623 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1624 return ide_queue_pc_tail(drive
, disk
, &pc
);
1626 (void)idetape_rewind_tape(drive
);
1627 idetape_create_erase_cmd(&pc
);
1628 return ide_queue_pc_tail(drive
, disk
, &pc
);
1631 if (mt_count
< tape
->blk_size
||
1632 mt_count
% tape
->blk_size
)
1634 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1635 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1637 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1640 ide_tape_discard_merge_buffer(drive
, 0);
1641 return idetape_position_tape(drive
,
1642 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1644 ide_tape_discard_merge_buffer(drive
, 0);
1645 return idetape_position_tape(drive
, 0, mt_count
, 0);
1649 retval
= ide_set_media_lock(drive
, disk
, 1);
1652 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1655 retval
= ide_set_media_lock(drive
, disk
, 0);
1658 tape
->door_locked
= DOOR_UNLOCKED
;
1661 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1668 * Our character device ioctls. General mtio.h magnetic io commands are
1669 * supported here, and not in the corresponding block interface. Our own
1670 * ide-tape ioctls are supported on both interfaces.
1672 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1673 unsigned int cmd
, unsigned long arg
)
1675 struct ide_tape_obj
*tape
= file
->private_data
;
1676 ide_drive_t
*drive
= tape
->drive
;
1680 int block_offset
= 0, position
= tape
->first_frame
;
1681 void __user
*argp
= (void __user
*)arg
;
1683 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1685 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1686 ide_tape_flush_merge_buffer(drive
);
1687 idetape_flush_tape_buffers(drive
);
1689 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1690 block_offset
= tape
->merge_bh_size
/
1691 (tape
->blk_size
* tape
->user_bs_factor
);
1692 position
= idetape_read_position(drive
);
1698 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1700 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1702 memset(&mtget
, 0, sizeof(struct mtget
));
1703 mtget
.mt_type
= MT_ISSCSI2
;
1704 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1706 ((tape
->blk_size
* tape
->user_bs_factor
)
1707 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1709 if (tape
->drv_write_prot
)
1710 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1712 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1716 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1717 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1721 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1722 ide_tape_discard_merge_buffer(drive
, 1);
1723 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1728 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1729 * block size with the reported value.
1731 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1733 idetape_tape_t
*tape
= drive
->driver_data
;
1734 struct ide_atapi_pc pc
;
1736 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1737 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1738 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1739 if (tape
->blk_size
== 0) {
1740 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1741 "block size, assuming 32k\n");
1742 tape
->blk_size
= 32768;
1746 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1747 (pc
.buf
[4 + 6] << 8) +
1749 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1752 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1754 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1756 idetape_tape_t
*tape
;
1759 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1763 tape
= ide_tape_chrdev_get(i
);
1769 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1772 * We really want to do nonseekable_open(inode, filp); here, but some
1773 * versions of tar incorrectly call lseek on tapes and bail out if that
1774 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1776 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1778 drive
= tape
->drive
;
1780 filp
->private_data
= tape
;
1782 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1787 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1789 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1790 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1794 idetape_read_position(drive
);
1795 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1796 (void)idetape_rewind_tape(drive
);
1798 /* Read block size and write protect status from drive. */
1799 ide_tape_get_bsize_from_bdesc(drive
);
1801 /* Set write protect flag if device is opened as read-only. */
1802 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1803 tape
->write_prot
= 1;
1805 tape
->write_prot
= tape
->drv_write_prot
;
1807 /* Make sure drive isn't write protected if user wants to write. */
1808 if (tape
->write_prot
) {
1809 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1810 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1811 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1817 /* Lock the tape drive door so user can't eject. */
1818 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1819 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1820 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1821 tape
->door_locked
= DOOR_LOCKED
;
1833 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1835 idetape_tape_t
*tape
= drive
->driver_data
;
1837 ide_tape_flush_merge_buffer(drive
);
1838 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1);
1839 if (tape
->merge_bh
!= NULL
) {
1840 idetape_pad_zeros(drive
, tape
->blk_size
*
1841 (tape
->user_bs_factor
- 1));
1842 ide_tape_kfree_buffer(tape
);
1843 tape
->merge_bh
= NULL
;
1845 idetape_write_filemark(drive
);
1846 idetape_flush_tape_buffers(drive
);
1847 idetape_flush_tape_buffers(drive
);
1850 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
1852 struct ide_tape_obj
*tape
= filp
->private_data
;
1853 ide_drive_t
*drive
= tape
->drive
;
1854 unsigned int minor
= iminor(inode
);
1857 tape
= drive
->driver_data
;
1859 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1861 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1862 idetape_write_release(drive
, minor
);
1863 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1865 ide_tape_discard_merge_buffer(drive
, 1);
1868 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
1869 (void) idetape_rewind_tape(drive
);
1870 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1871 if (tape
->door_locked
== DOOR_LOCKED
) {
1872 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
1873 tape
->door_locked
= DOOR_UNLOCKED
;
1876 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1882 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
1884 idetape_tape_t
*tape
= drive
->driver_data
;
1885 struct ide_atapi_pc pc
;
1887 char fw_rev
[4], vendor_id
[8], product_id
[16];
1889 idetape_create_inquiry_cmd(&pc
);
1890 pc
.buf
= &pc_buf
[0];
1891 pc
.buf_size
= sizeof(pc_buf
);
1893 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1894 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
1898 memcpy(vendor_id
, &pc
.buf
[8], 8);
1899 memcpy(product_id
, &pc
.buf
[16], 16);
1900 memcpy(fw_rev
, &pc
.buf
[32], 4);
1902 ide_fixstring(vendor_id
, 8, 0);
1903 ide_fixstring(product_id
, 16, 0);
1904 ide_fixstring(fw_rev
, 4, 0);
1906 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1907 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
1911 * Ask the tape about its various parameters. In particular, we will adjust our
1912 * data transfer buffer size to the recommended value as returned by the tape.
1914 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
1916 idetape_tape_t
*tape
= drive
->driver_data
;
1917 struct ide_atapi_pc pc
;
1919 u8 speed
, max_speed
;
1921 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
1922 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1923 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
1924 " some default values\n");
1925 tape
->blk_size
= 512;
1926 put_unaligned(52, (u16
*)&tape
->caps
[12]);
1927 put_unaligned(540, (u16
*)&tape
->caps
[14]);
1928 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
1931 caps
= pc
.buf
+ 4 + pc
.buf
[3];
1933 /* convert to host order and save for later use */
1934 speed
= be16_to_cpup((__be16
*)&caps
[14]);
1935 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
1937 *(u16
*)&caps
[8] = max_speed
;
1938 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
1939 *(u16
*)&caps
[14] = speed
;
1940 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
1943 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
1944 "(assuming 650KB/sec)\n", drive
->name
);
1945 *(u16
*)&caps
[14] = 650;
1948 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
1949 "(assuming 650KB/sec)\n", drive
->name
);
1950 *(u16
*)&caps
[8] = 650;
1953 memcpy(&tape
->caps
, caps
, 20);
1955 /* device lacks locking support according to capabilities page */
1956 if ((caps
[6] & 1) == 0)
1957 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
1960 tape
->blk_size
= 512;
1961 else if (caps
[7] & 0x04)
1962 tape
->blk_size
= 1024;
1965 #ifdef CONFIG_IDE_PROC_FS
1966 #define ide_tape_devset_get(name, field) \
1967 static int get_##name(ide_drive_t *drive) \
1969 idetape_tape_t *tape = drive->driver_data; \
1970 return tape->field; \
1973 #define ide_tape_devset_set(name, field) \
1974 static int set_##name(ide_drive_t *drive, int arg) \
1976 idetape_tape_t *tape = drive->driver_data; \
1977 tape->field = arg; \
1981 #define ide_tape_devset_rw_field(_name, _field) \
1982 ide_tape_devset_get(_name, _field) \
1983 ide_tape_devset_set(_name, _field) \
1984 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1986 #define ide_tape_devset_r_field(_name, _field) \
1987 ide_tape_devset_get(_name, _field) \
1988 IDE_DEVSET(_name, 0, get_##_name, NULL)
1990 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
1991 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
1992 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
1993 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
1995 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
1997 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
1998 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2000 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2001 ide_tape_devset_r_field(speed
, caps
[14]);
2002 ide_tape_devset_r_field(buffer
, caps
[16]);
2003 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2005 static const struct ide_proc_devset idetape_settings
[] = {
2006 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2007 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2008 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2009 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2010 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2011 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2012 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2013 mulf_tdsc
, divf_tdsc
),
2019 * The function below is called to:
2021 * 1. Initialize our various state variables.
2022 * 2. Ask the tape for its capabilities.
2023 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2024 * is chosen based on the recommendation which we received in step 2.
2026 * Note that at this point ide.c already assigned us an irq, so that we can
2027 * queue requests here and wait for their completion.
2029 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2034 u16
*ctl
= (u16
*)&tape
->caps
[12];
2036 drive
->pc_callback
= ide_tape_callback
;
2037 drive
->pc_update_buffers
= idetape_update_buffers
;
2038 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2040 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2042 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2043 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2045 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2048 /* Seagate Travan drives do not support DSC overlap. */
2049 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2050 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2052 tape
->minor
= minor
;
2053 tape
->name
[0] = 'h';
2054 tape
->name
[1] = 't';
2055 tape
->name
[2] = '0' + minor
;
2056 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2058 idetape_get_inquiry_results(drive
);
2059 idetape_get_mode_sense_results(drive
);
2060 ide_tape_get_bsize_from_bdesc(drive
);
2061 tape
->user_bs_factor
= 1;
2062 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2063 while (tape
->buffer_size
> 0xffff) {
2064 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2066 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2068 buffer_size
= tape
->buffer_size
;
2070 /* select the "best" DSC read/write polling freq */
2071 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2073 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2076 * Ensure that the number we got makes sense; limit it within
2077 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2079 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2080 IDETAPE_DSC_RW_MAX
);
2081 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2083 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2084 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2085 tape
->buffer_size
/ 1024,
2086 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2087 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2089 ide_proc_register_driver(drive
, tape
->driver
);
2092 static void ide_tape_remove(ide_drive_t
*drive
)
2094 idetape_tape_t
*tape
= drive
->driver_data
;
2096 ide_proc_unregister_driver(drive
, tape
->driver
);
2097 device_del(&tape
->dev
);
2098 ide_unregister_region(tape
->disk
);
2100 mutex_lock(&idetape_ref_mutex
);
2101 put_device(&tape
->dev
);
2102 mutex_unlock(&idetape_ref_mutex
);
2105 static void ide_tape_release(struct device
*dev
)
2107 struct ide_tape_obj
*tape
= to_ide_drv(dev
, ide_tape_obj
);
2108 ide_drive_t
*drive
= tape
->drive
;
2109 struct gendisk
*g
= tape
->disk
;
2111 BUG_ON(tape
->merge_bh_size
);
2113 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2114 drive
->driver_data
= NULL
;
2115 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2116 device_destroy(idetape_sysfs_class
,
2117 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2118 idetape_devs
[tape
->minor
] = NULL
;
2119 g
->private_data
= NULL
;
2124 #ifdef CONFIG_IDE_PROC_FS
2125 static int proc_idetape_read_name
2126 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2128 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2129 idetape_tape_t
*tape
= drive
->driver_data
;
2133 len
= sprintf(out
, "%s\n", tape
->name
);
2134 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2137 static ide_proc_entry_t idetape_proc
[] = {
2138 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2139 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2140 { NULL
, 0, NULL
, NULL
}
2143 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2145 return idetape_proc
;
2148 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2150 return idetape_settings
;
2154 static int ide_tape_probe(ide_drive_t
*);
2156 static struct ide_driver idetape_driver
= {
2158 .owner
= THIS_MODULE
,
2160 .bus
= &ide_bus_type
,
2162 .probe
= ide_tape_probe
,
2163 .remove
= ide_tape_remove
,
2164 .version
= IDETAPE_VERSION
,
2165 .do_request
= idetape_do_request
,
2166 #ifdef CONFIG_IDE_PROC_FS
2167 .proc_entries
= ide_tape_proc_entries
,
2168 .proc_devsets
= ide_tape_proc_devsets
,
2172 /* Our character device supporting functions, passed to register_chrdev. */
2173 static const struct file_operations idetape_fops
= {
2174 .owner
= THIS_MODULE
,
2175 .read
= idetape_chrdev_read
,
2176 .write
= idetape_chrdev_write
,
2177 .ioctl
= idetape_chrdev_ioctl
,
2178 .open
= idetape_chrdev_open
,
2179 .release
= idetape_chrdev_release
,
2182 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
2184 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
2192 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
2194 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
2200 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
2201 unsigned int cmd
, unsigned long arg
)
2203 struct ide_tape_obj
*tape
= ide_drv_g(bdev
->bd_disk
, ide_tape_obj
);
2204 ide_drive_t
*drive
= tape
->drive
;
2205 int err
= generic_ide_ioctl(drive
, bdev
, cmd
, arg
);
2207 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2211 static struct block_device_operations idetape_block_ops
= {
2212 .owner
= THIS_MODULE
,
2213 .open
= idetape_open
,
2214 .release
= idetape_release
,
2215 .locked_ioctl
= idetape_ioctl
,
2218 static int ide_tape_probe(ide_drive_t
*drive
)
2220 idetape_tape_t
*tape
;
2224 if (!strstr("ide-tape", drive
->driver_req
))
2227 if (drive
->media
!= ide_tape
)
2230 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
2231 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
2232 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2233 " the driver\n", drive
->name
);
2236 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2238 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2243 g
= alloc_disk(1 << PARTN_BITS
);
2247 ide_init_disk(g
, drive
);
2249 tape
->dev
.parent
= &drive
->gendev
;
2250 tape
->dev
.release
= ide_tape_release
;
2251 dev_set_name(&tape
->dev
, dev_name(&drive
->gendev
));
2253 if (device_register(&tape
->dev
))
2256 tape
->drive
= drive
;
2257 tape
->driver
= &idetape_driver
;
2260 g
->private_data
= &tape
->driver
;
2262 drive
->driver_data
= tape
;
2264 mutex_lock(&idetape_ref_mutex
);
2265 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2267 idetape_devs
[minor
] = tape
;
2268 mutex_unlock(&idetape_ref_mutex
);
2270 idetape_setup(drive
, tape
, minor
);
2272 device_create(idetape_sysfs_class
, &drive
->gendev
,
2273 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
2274 device_create(idetape_sysfs_class
, &drive
->gendev
,
2275 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2278 g
->fops
= &idetape_block_ops
;
2279 ide_register_region(g
);
2291 static void __exit
idetape_exit(void)
2293 driver_unregister(&idetape_driver
.gen_driver
);
2294 class_destroy(idetape_sysfs_class
);
2295 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2298 static int __init
idetape_init(void)
2301 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2302 if (IS_ERR(idetape_sysfs_class
)) {
2303 idetape_sysfs_class
= NULL
;
2304 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2309 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2310 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2313 goto out_free_class
;
2316 error
= driver_register(&idetape_driver
.gen_driver
);
2318 goto out_free_driver
;
2323 driver_unregister(&idetape_driver
.gen_driver
);
2325 class_destroy(idetape_sysfs_class
);
2330 MODULE_ALIAS("ide:*m-tape*");
2331 module_init(idetape_init
);
2332 module_exit(idetape_exit
);
2333 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2334 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2335 MODULE_LICENSE("GPL");