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 /* Error codes returned in rq->errors to the higher part of the driver. */
156 #define IDETAPE_ERROR_GENERAL 101
157 #define IDETAPE_ERROR_FILEMARK 102
158 #define IDETAPE_ERROR_EOD 103
160 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
161 #define IDETAPE_BLOCK_DESCRIPTOR 0
162 #define IDETAPE_CAPABILITIES_PAGE 0x2a
165 * Most of our global data which we need to save even as we leave the driver due
166 * to an interrupt or a timer event is stored in the struct defined below.
168 typedef struct ide_tape_obj {
170 ide_driver_t *driver;
171 struct gendisk *disk;
175 * failed_pc points to the last failed packet command, or contains
176 * NULL if we do not need to retry any packet command. This is
177 * required since an additional packet command is needed before the
178 * retry, to get detailed information on what went wrong.
180 /* Last failed packet command */
181 struct ide_atapi_pc *failed_pc;
182 /* used by REQ_IDETAPE_{READ,WRITE} requests */
183 struct ide_atapi_pc queued_pc;
186 * DSC polling variables.
188 * While polling for DSC we use postponed_rq to postpone the current
189 * request so that ide.c will be able to service pending requests on the
190 * other device. Note that at most we will have only one DSC (usually
191 * data transfer) request in the device request queue.
193 struct request *postponed_rq;
194 /* The time in which we started polling for DSC */
195 unsigned long dsc_polling_start;
196 /* Timer used to poll for dsc */
197 struct timer_list dsc_timer;
198 /* Read/Write dsc polling frequency */
199 unsigned long best_dsc_rw_freq;
200 unsigned long dsc_poll_freq;
201 unsigned long dsc_timeout;
203 /* Read position information */
206 unsigned int first_frame;
208 /* Last error information */
209 u8 sense_key, asc, ascq;
211 /* Character device operation */
215 /* Current character device data transfer direction */
218 /* tape block size, usually 512 or 1024 bytes */
219 unsigned short blk_size;
222 /* Copy of the tape's Capabilities and Mechanical Page */
226 * Active data transfer request parameters.
228 * At most, there is only one ide-tape originated data transfer request
229 * in the device request queue. This allows ide.c to easily service
230 * requests from the other device when we postpone our active request.
233 /* Data buffer size chosen based on the tape's recommendation */
236 struct idetape_bh *merge_bh;
237 /* size of the merge buffer */
239 /* pointer to current buffer head within the merge buffer */
240 struct idetape_bh *bh;
244 int pages_per_buffer;
245 /* Wasted space in each stage */
248 /* protects the ide-tape queue */
251 /* Measures average tape speed */
252 unsigned long avg_time;
256 /* the door is currently locked */
258 /* the tape hardware is write protected */
260 /* the tape is write protected (hardware or opened as read-only) */
266 static DEFINE_MUTEX(idetape_ref_mutex);
268 static struct class *idetape_sysfs_class;
270 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
272 #define ide_tape_g(disk) \
273 container_of((disk)->private_data, struct ide_tape_obj, driver)
275 static void ide_tape_release(struct kref *);
277 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
279 struct ide_tape_obj *tape = NULL;
281 mutex_lock(&idetape_ref_mutex);
282 tape = ide_tape_g(disk);
284 if (ide_device_get(tape->drive))
287 kref_get(&tape->kref);
289 mutex_unlock(&idetape_ref_mutex);
293 static void ide_tape_put(struct ide_tape_obj *tape)
295 ide_drive_t *drive = tape->drive;
297 mutex_lock(&idetape_ref_mutex);
298 kref_put(&tape->kref, ide_tape_release);
299 ide_device_put(drive);
300 mutex_unlock(&idetape_ref_mutex);
304 * The variables below are used for the character device interface. Additional
305 * state variables are defined in our ide_drive_t structure.
307 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
309 #define ide_tape_f(file) ((file)->private_data)
311 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
313 struct ide_tape_obj *tape = NULL;
315 mutex_lock(&idetape_ref_mutex);
316 tape = idetape_devs[i];
318 kref_get(&tape->kref);
319 mutex_unlock(&idetape_ref_mutex);
323 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
326 struct idetape_bh *bh = pc->bh;
331 printk(KERN_ERR "ide-tape: bh == NULL in "
332 "idetape_input_buffers\n");
333 ide_pad_transfer(drive, 0, bcount);
337 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
339 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
340 atomic_read(&bh->b_count), count);
342 atomic_add(count, &bh->b_count);
343 if (atomic_read(&bh->b_count) == bh->b_size) {
346 atomic_set(&bh->b_count, 0);
352 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
355 struct idetape_bh *bh = pc->bh;
360 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
364 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
365 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
368 pc->b_count -= count;
373 pc->b_data = bh->b_data;
374 pc->b_count = atomic_read(&bh->b_count);
380 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
382 struct idetape_bh *bh = pc->bh;
384 unsigned int bcount = pc->xferred;
386 if (pc->flags & PC_FLAG_WRITING)
390 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
394 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
395 atomic_set(&bh->b_count, count);
396 if (atomic_read(&bh->b_count) == bh->b_size)
404 * called on each failed packet command retry to analyze the request sense. We
405 * currently do not utilize this information.
407 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
409 idetape_tape_t *tape = drive->driver_data;
410 struct ide_atapi_pc *pc = tape->failed_pc;
412 tape->sense_key = sense[2] & 0xF;
413 tape->asc = sense[12];
414 tape->ascq = sense[13];
416 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
417 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
419 /* Correct pc->xferred by asking the tape. */
420 if (pc->flags & PC_FLAG_DMA_ERROR) {
421 pc->xferred = pc->req_xfer -
423 get_unaligned_be32(&sense[3]);
424 idetape_update_buffers(drive, pc);
428 * If error was the result of a zero-length read or write command,
429 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
430 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
432 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
434 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
435 if (tape->sense_key == 5) {
436 /* don't report an error, everything's ok */
438 /* don't retry read/write */
439 pc->flags |= PC_FLAG_ABORT;
442 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
443 pc->error = IDETAPE_ERROR_FILEMARK;
444 pc->flags |= PC_FLAG_ABORT;
446 if (pc->c[0] == WRITE_6) {
447 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
448 && tape->asc == 0x0 && tape->ascq == 0x2)) {
449 pc->error = IDETAPE_ERROR_EOD;
450 pc->flags |= PC_FLAG_ABORT;
453 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
454 if (tape->sense_key == 8) {
455 pc->error = IDETAPE_ERROR_EOD;
456 pc->flags |= PC_FLAG_ABORT;
458 if (!(pc->flags & PC_FLAG_ABORT) &&
460 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
464 /* Free data buffers completely. */
465 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
467 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
470 u32 size = bh->b_size;
473 unsigned int order = fls(size >> PAGE_SHIFT)-1;
476 free_pages((unsigned long)bh->b_data, order);
479 bh->b_data += (1 << order) * PAGE_SIZE;
487 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
489 struct request *rq = HWGROUP(drive)->rq;
490 idetape_tape_t *tape = drive->driver_data;
494 debug_log(DBG_PROCS, "Enter %s\n", __func__);
497 case 0: error = IDETAPE_ERROR_GENERAL; break;
498 case 1: error = 0; break;
499 default: error = uptodate;
503 tape->failed_pc = NULL;
505 if (!blk_special_request(rq)) {
506 ide_end_request(drive, uptodate, nr_sects);
510 spin_lock_irqsave(&tape->lock, flags);
512 ide_end_drive_cmd(drive, 0, 0);
514 spin_unlock_irqrestore(&tape->lock, flags);
518 static void ide_tape_handle_dsc(ide_drive_t *);
520 static void ide_tape_callback(ide_drive_t *drive, int dsc)
522 idetape_tape_t *tape = drive->driver_data;
523 struct ide_atapi_pc *pc = drive->pc;
524 int uptodate = pc->error ? 0 : 1;
526 debug_log(DBG_PROCS, "Enter %s\n", __func__);
529 ide_tape_handle_dsc(drive);
531 if (tape->failed_pc == pc)
532 tape->failed_pc = NULL;
534 if (pc->c[0] == REQUEST_SENSE) {
536 idetape_analyze_error(drive, pc->buf);
538 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
539 "itself - Aborting request!\n");
540 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
541 struct request *rq = drive->hwif->hwgroup->rq;
542 int blocks = pc->xferred / tape->blk_size;
544 tape->avg_size += blocks * tape->blk_size;
546 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
547 tape->avg_speed = tape->avg_size * HZ /
548 (jiffies - tape->avg_time) / 1024;
550 tape->avg_time = jiffies;
553 tape->first_frame += blocks;
554 rq->current_nr_sectors -= blocks;
557 uptodate = pc->error;
558 } else if (pc->c[0] == READ_POSITION && uptodate) {
559 u8 *readpos = pc->buf;
561 debug_log(DBG_SENSE, "BOP - %s\n",
562 (readpos[0] & 0x80) ? "Yes" : "No");
563 debug_log(DBG_SENSE, "EOP - %s\n",
564 (readpos[0] & 0x40) ? "Yes" : "No");
566 if (readpos[0] & 0x4) {
567 printk(KERN_INFO "ide-tape: Block location is unknown"
569 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
572 debug_log(DBG_SENSE, "Block Location - %u\n",
573 be32_to_cpup((__be32 *)&readpos[4]));
575 tape->partition = readpos[1];
576 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
577 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
581 idetape_end_request(drive, uptodate, 0);
585 * Postpone the current request so that ide.c will be able to service requests
586 * from another device on the same hwgroup while we are polling for DSC.
588 static void idetape_postpone_request(ide_drive_t *drive)
590 idetape_tape_t *tape = drive->driver_data;
592 debug_log(DBG_PROCS, "Enter %s\n", __func__);
594 tape->postponed_rq = HWGROUP(drive)->rq;
595 ide_stall_queue(drive, tape->dsc_poll_freq);
598 static void ide_tape_handle_dsc(ide_drive_t *drive)
600 idetape_tape_t *tape = drive->driver_data;
602 /* Media access command */
603 tape->dsc_polling_start = jiffies;
604 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
605 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
606 /* Allow ide.c to handle other requests */
607 idetape_postpone_request(drive);
610 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
611 unsigned int bcount, int write)
614 idetape_output_buffers(drive, pc, bcount);
616 idetape_input_buffers(drive, pc, bcount);
622 * Packet Command Interface
624 * The current Packet Command is available in drive->pc, and will not change
625 * until we finish handling it. Each packet command is associated with a
626 * callback function that will be called when the command is finished.
628 * The handling will be done in three stages:
630 * 1. idetape_issue_pc will send the packet command to the drive, and will set
631 * the interrupt handler to ide_pc_intr.
633 * 2. On each interrupt, ide_pc_intr will be called. This step will be
634 * repeated until the device signals us that no more interrupts will be issued.
636 * 3. ATAPI Tape media access commands have immediate status with a delayed
637 * process. In case of a successful initiation of a media access packet command,
638 * the DSC bit will be set when the actual execution of the command is finished.
639 * Since the tape drive will not issue an interrupt, we have to poll for this
640 * event. In this case, we define the request as "low priority request" by
641 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
644 * ide.c will then give higher priority to requests which originate from the
645 * other device, until will change rq_status to RQ_ACTIVE.
647 * 4. When the packet command is finished, it will be checked for errors.
649 * 5. In case an error was found, we queue a request sense packet command in
650 * front of the request queue and retry the operation up to
651 * IDETAPE_MAX_PC_RETRIES times.
653 * 6. In case no error was found, or we decided to give up and not to retry
654 * again, the callback function will be called and then we will handle the next
657 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
659 return ide_transfer_pc(drive, WAIT_TAPE_CMD, NULL);
662 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
663 struct ide_atapi_pc *pc)
665 idetape_tape_t *tape = drive->driver_data;
667 if (drive->pc->c[0] == REQUEST_SENSE &&
668 pc->c[0] == REQUEST_SENSE) {
669 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
670 "Two request sense in serial were issued\n");
673 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
674 tape->failed_pc = pc;
676 /* Set the current packet command */
679 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
680 (pc->flags & PC_FLAG_ABORT)) {
682 * We will "abort" retrying a packet command in case legitimate
683 * error code was received (crossing a filemark, or end of the
684 * media, for example).
686 if (!(pc->flags & PC_FLAG_ABORT)) {
687 if (!(pc->c[0] == TEST_UNIT_READY &&
688 tape->sense_key == 2 && tape->asc == 4 &&
689 (tape->ascq == 1 || tape->ascq == 8))) {
690 printk(KERN_ERR "ide-tape: %s: I/O error, "
691 "pc = %2x, key = %2x, "
692 "asc = %2x, ascq = %2x\n",
693 tape->name, pc->c[0],
694 tape->sense_key, tape->asc,
698 pc->error = IDETAPE_ERROR_GENERAL;
700 tape->failed_pc = NULL;
701 drive->pc_callback(drive, 0);
704 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
708 return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
711 /* A mode sense command is used to "sense" tape parameters. */
712 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
715 pc->c[0] = MODE_SENSE;
716 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
717 /* DBD = 1 - Don't return block descriptors */
719 pc->c[2] = page_code;
721 * Changed pc->c[3] to 0 (255 will at best return unused info).
723 * For SCSI this byte is defined as subpage instead of high byte
724 * of length and some IDE drives seem to interpret it this way
725 * and return an error when 255 is used.
728 /* We will just discard data in that case */
730 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
732 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
738 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
740 ide_hwif_t *hwif = drive->hwif;
741 idetape_tape_t *tape = drive->driver_data;
742 struct ide_atapi_pc *pc = drive->pc;
745 stat = hwif->tp_ops->read_status(hwif);
747 if (stat & ATA_DSC) {
748 if (stat & ATA_ERR) {
750 if (pc->c[0] != TEST_UNIT_READY)
751 printk(KERN_ERR "ide-tape: %s: I/O error, ",
753 /* Retry operation */
754 ide_retry_pc(drive, tape->disk);
759 pc->error = IDETAPE_ERROR_GENERAL;
760 tape->failed_pc = NULL;
762 drive->pc_callback(drive, 0);
766 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
767 struct ide_atapi_pc *pc, struct request *rq,
770 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
771 unsigned int length = rq->current_nr_sectors;
774 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
778 pc->buf_size = length * tape->blk_size;
779 pc->req_xfer = pc->buf_size;
780 if (pc->req_xfer == tape->buffer_size)
781 pc->flags |= PC_FLAG_DMA_OK;
783 if (opcode == READ_6) {
785 atomic_set(&bh->b_count, 0);
786 } else if (opcode == WRITE_6) {
788 pc->flags |= PC_FLAG_WRITING;
789 pc->b_data = bh->b_data;
790 pc->b_count = atomic_read(&bh->b_count);
793 memcpy(rq->cmd, pc->c, 12);
796 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
797 struct request *rq, sector_t block)
799 ide_hwif_t *hwif = drive->hwif;
800 idetape_tape_t *tape = drive->driver_data;
801 struct ide_atapi_pc *pc = NULL;
802 struct request *postponed_rq = tape->postponed_rq;
805 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
806 " current_nr_sectors: %u\n",
807 (unsigned long long)rq->sector, rq->nr_sectors,
808 rq->current_nr_sectors);
810 if (!blk_special_request(rq)) {
811 /* We do not support buffer cache originated requests. */
812 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
813 "request queue (%d)\n", drive->name, rq->cmd_type);
814 ide_end_request(drive, 0, 0);
818 /* Retry a failed packet command */
819 if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
820 pc = tape->failed_pc;
824 if (postponed_rq != NULL)
825 if (rq != postponed_rq) {
826 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
827 "Two DSC requests were queued\n");
828 idetape_end_request(drive, 0, 0);
832 tape->postponed_rq = NULL;
835 * If the tape is still busy, postpone our request and service
836 * the other device meanwhile.
838 stat = hwif->tp_ops->read_status(hwif);
840 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
841 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
843 if (drive->post_reset == 1) {
844 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
845 drive->post_reset = 0;
848 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
849 (stat & ATA_DSC) == 0) {
850 if (postponed_rq == NULL) {
851 tape->dsc_polling_start = jiffies;
852 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
853 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
854 } else if (time_after(jiffies, tape->dsc_timeout)) {
855 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
857 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
858 idetape_media_access_finished(drive);
861 return ide_do_reset(drive);
863 } else if (time_after(jiffies,
864 tape->dsc_polling_start +
865 IDETAPE_DSC_MA_THRESHOLD))
866 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
867 idetape_postpone_request(drive);
870 if (rq->cmd[13] & REQ_IDETAPE_READ) {
871 pc = &tape->queued_pc;
872 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
875 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
876 pc = &tape->queued_pc;
877 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
880 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
881 pc = (struct ide_atapi_pc *) rq->buffer;
882 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
883 rq->cmd[13] |= REQ_IDETAPE_PC2;
886 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
887 idetape_media_access_finished(drive);
893 return idetape_issue_pc(drive, pc);
897 * The function below uses __get_free_pages to allocate a data buffer of size
898 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
901 * It returns a pointer to the newly allocated buffer, or NULL in case of
904 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
907 struct idetape_bh *prev_bh, *bh, *merge_bh;
908 int pages = tape->pages_per_buffer;
909 unsigned int order, b_allocd;
912 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
917 order = fls(pages) - 1;
918 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
921 b_allocd = (1 << order) * PAGE_SIZE;
925 memset(bh->b_data, 0, b_allocd);
926 bh->b_reqnext = NULL;
927 bh->b_size = b_allocd;
928 atomic_set(&bh->b_count, full ? bh->b_size : 0);
931 order = fls(pages) - 1;
932 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
935 b_allocd = (1 << order) * PAGE_SIZE;
938 memset(b_data, 0, b_allocd);
940 /* newly allocated page frames below buffer header or ...*/
941 if (bh->b_data == b_data + b_allocd) {
942 bh->b_size += b_allocd;
943 bh->b_data -= b_allocd;
945 atomic_add(b_allocd, &bh->b_count);
948 /* they are above the header */
949 if (b_data == bh->b_data + bh->b_size) {
950 bh->b_size += b_allocd;
952 atomic_add(b_allocd, &bh->b_count);
956 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
958 free_pages((unsigned long) b_data, order);
961 bh->b_reqnext = NULL;
963 bh->b_size = b_allocd;
964 atomic_set(&bh->b_count, full ? bh->b_size : 0);
965 prev_bh->b_reqnext = bh;
970 bh->b_size -= tape->excess_bh_size;
972 atomic_sub(tape->excess_bh_size, &bh->b_count);
975 ide_tape_kfree_buffer(tape);
979 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
980 const char __user *buf, int n)
982 struct idetape_bh *bh = tape->bh;
988 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
992 count = min((unsigned int)
993 (bh->b_size - atomic_read(&bh->b_count)),
995 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
999 atomic_add(count, &bh->b_count);
1001 if (atomic_read(&bh->b_count) == bh->b_size) {
1004 atomic_set(&bh->b_count, 0);
1011 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1014 struct idetape_bh *bh = tape->bh;
1020 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1024 count = min(tape->b_count, n);
1025 if (copy_to_user(buf, tape->b_data, count))
1028 tape->b_data += count;
1029 tape->b_count -= count;
1031 if (!tape->b_count) {
1035 tape->b_data = bh->b_data;
1036 tape->b_count = atomic_read(&bh->b_count);
1043 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1045 struct idetape_bh *bh = tape->merge_bh;
1046 tape->bh = tape->merge_bh;
1048 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1049 atomic_set(&bh->b_count, 0);
1051 tape->b_data = bh->b_data;
1052 tape->b_count = atomic_read(&bh->b_count);
1057 * Write a filemark if write_filemark=1. Flush the device buffers without
1058 * writing a filemark otherwise.
1060 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1061 struct ide_atapi_pc *pc, int write_filemark)
1064 pc->c[0] = WRITE_FILEMARKS;
1065 pc->c[4] = write_filemark;
1066 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1069 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1071 idetape_tape_t *tape = drive->driver_data;
1072 struct gendisk *disk = tape->disk;
1073 int load_attempted = 0;
1075 /* Wait for the tape to become ready */
1076 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1078 while (time_before(jiffies, timeout)) {
1079 if (ide_do_test_unit_ready(drive, disk) == 0)
1081 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1082 || (tape->asc == 0x3A)) {
1086 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1088 /* not about to be ready */
1089 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1090 (tape->ascq == 1 || tape->ascq == 8)))
1097 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1099 struct ide_tape_obj *tape = drive->driver_data;
1100 struct ide_atapi_pc pc;
1103 idetape_create_write_filemark_cmd(drive, &pc, 0);
1104 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1107 idetape_wait_ready(drive, 60 * 5 * HZ);
1111 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1114 pc->c[0] = READ_POSITION;
1118 static int idetape_read_position(ide_drive_t *drive)
1120 idetape_tape_t *tape = drive->driver_data;
1121 struct ide_atapi_pc pc;
1124 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1126 idetape_create_read_position_cmd(&pc);
1127 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1129 position = tape->first_frame;
1133 static void idetape_create_locate_cmd(ide_drive_t *drive,
1134 struct ide_atapi_pc *pc,
1135 unsigned int block, u8 partition, int skip)
1138 pc->c[0] = POSITION_TO_ELEMENT;
1140 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1141 pc->c[8] = partition;
1142 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1145 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1147 idetape_tape_t *tape = drive->driver_data;
1149 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1152 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1153 tape->merge_bh_size = 0;
1154 if (tape->merge_bh != NULL) {
1155 ide_tape_kfree_buffer(tape);
1156 tape->merge_bh = NULL;
1159 tape->chrdev_dir = IDETAPE_DIR_NONE;
1163 * Position the tape to the requested block using the LOCATE packet command.
1164 * A READ POSITION command is then issued to check where we are positioned. Like
1165 * all higher level operations, we queue the commands at the tail of the request
1166 * queue and wait for their completion.
1168 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1169 u8 partition, int skip)
1171 idetape_tape_t *tape = drive->driver_data;
1172 struct gendisk *disk = tape->disk;
1174 struct ide_atapi_pc pc;
1176 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1177 __ide_tape_discard_merge_buffer(drive);
1178 idetape_wait_ready(drive, 60 * 5 * HZ);
1179 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1180 retval = ide_queue_pc_tail(drive, disk, &pc);
1184 idetape_create_read_position_cmd(&pc);
1185 return ide_queue_pc_tail(drive, disk, &pc);
1188 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1189 int restore_position)
1191 idetape_tape_t *tape = drive->driver_data;
1194 __ide_tape_discard_merge_buffer(drive);
1195 if (restore_position) {
1196 position = idetape_read_position(drive);
1197 seek = position > 0 ? position : 0;
1198 if (idetape_position_tape(drive, seek, 0, 0)) {
1199 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1200 " %s\n", tape->name, __func__);
1207 * Generate a read/write request for the block device interface and wait for it
1210 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1211 struct idetape_bh *bh)
1213 idetape_tape_t *tape = drive->driver_data;
1217 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1219 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1220 rq->cmd_type = REQ_TYPE_SPECIAL;
1222 rq->rq_disk = tape->disk;
1223 rq->special = (void *)bh;
1224 rq->sector = tape->first_frame;
1225 rq->nr_sectors = blocks;
1226 rq->current_nr_sectors = blocks;
1227 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1229 errors = rq->errors;
1230 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1231 blk_put_request(rq);
1233 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1237 idetape_init_merge_buffer(tape);
1238 if (errors == IDETAPE_ERROR_GENERAL)
1243 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1251 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1252 struct ide_atapi_pc *pc)
1255 pc->c[0] = REZERO_UNIT;
1256 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1259 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1264 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1267 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1271 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1273 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1276 /* Queue up a character device originated write request. */
1277 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1279 idetape_tape_t *tape = drive->driver_data;
1281 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1283 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1284 blocks, tape->merge_bh);
1287 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1289 idetape_tape_t *tape = drive->driver_data;
1291 struct idetape_bh *bh;
1293 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1294 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1295 " but we are not writing.\n");
1298 if (tape->merge_bh_size > tape->buffer_size) {
1299 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1300 tape->merge_bh_size = tape->buffer_size;
1302 if (tape->merge_bh_size) {
1303 blocks = tape->merge_bh_size / tape->blk_size;
1304 if (tape->merge_bh_size % tape->blk_size) {
1308 i = tape->blk_size - tape->merge_bh_size %
1310 bh = tape->bh->b_reqnext;
1312 atomic_set(&bh->b_count, 0);
1318 printk(KERN_INFO "ide-tape: bug,"
1322 min = min(i, (unsigned int)(bh->b_size -
1323 atomic_read(&bh->b_count)));
1324 memset(bh->b_data + atomic_read(&bh->b_count),
1326 atomic_add(min, &bh->b_count);
1331 (void) idetape_add_chrdev_write_request(drive, blocks);
1332 tape->merge_bh_size = 0;
1334 if (tape->merge_bh != NULL) {
1335 ide_tape_kfree_buffer(tape);
1336 tape->merge_bh = NULL;
1338 tape->chrdev_dir = IDETAPE_DIR_NONE;
1341 static int idetape_init_read(ide_drive_t *drive)
1343 idetape_tape_t *tape = drive->driver_data;
1346 /* Initialize read operation */
1347 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1348 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1349 ide_tape_flush_merge_buffer(drive);
1350 idetape_flush_tape_buffers(drive);
1352 if (tape->merge_bh || tape->merge_bh_size) {
1353 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1355 tape->merge_bh_size = 0;
1357 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1358 if (!tape->merge_bh)
1360 tape->chrdev_dir = IDETAPE_DIR_READ;
1363 * Issue a read 0 command to ensure that DSC handshake is
1364 * switched from completion mode to buffer available mode.
1365 * No point in issuing this if DSC overlap isn't supported, some
1366 * drives (Seagate STT3401A) will return an error.
1368 if (drive->dsc_overlap) {
1369 bytes_read = idetape_queue_rw_tail(drive,
1370 REQ_IDETAPE_READ, 0,
1372 if (bytes_read < 0) {
1373 ide_tape_kfree_buffer(tape);
1374 tape->merge_bh = NULL;
1375 tape->chrdev_dir = IDETAPE_DIR_NONE;
1384 /* called from idetape_chrdev_read() to service a chrdev read request. */
1385 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1387 idetape_tape_t *tape = drive->driver_data;
1389 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1391 /* If we are at a filemark, return a read length of 0 */
1392 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1395 idetape_init_read(drive);
1397 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1401 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1403 idetape_tape_t *tape = drive->driver_data;
1404 struct idetape_bh *bh;
1410 bh = tape->merge_bh;
1411 count = min(tape->buffer_size, bcount);
1413 blocks = count / tape->blk_size;
1415 atomic_set(&bh->b_count,
1416 min(count, (unsigned int)bh->b_size));
1417 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1418 count -= atomic_read(&bh->b_count);
1421 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1427 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1428 * currently support only one partition.
1430 static int idetape_rewind_tape(ide_drive_t *drive)
1432 struct ide_tape_obj *tape = drive->driver_data;
1433 struct gendisk *disk = tape->disk;
1435 struct ide_atapi_pc pc;
1437 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1439 idetape_create_rewind_cmd(drive, &pc);
1440 retval = ide_queue_pc_tail(drive, disk, &pc);
1444 idetape_create_read_position_cmd(&pc);
1445 retval = ide_queue_pc_tail(drive, disk, &pc);
1451 /* mtio.h compatible commands should be issued to the chrdev interface. */
1452 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1455 idetape_tape_t *tape = drive->driver_data;
1456 void __user *argp = (void __user *)arg;
1458 struct idetape_config {
1459 int dsc_rw_frequency;
1460 int dsc_media_access_frequency;
1464 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1468 if (copy_from_user(&config, argp, sizeof(config)))
1470 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1473 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1474 config.nr_stages = 1;
1475 if (copy_to_user(argp, &config, sizeof(config)))
1484 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1487 idetape_tape_t *tape = drive->driver_data;
1488 struct gendisk *disk = tape->disk;
1489 struct ide_atapi_pc pc;
1490 int retval, count = 0;
1491 int sprev = !!(tape->caps[4] & 0x20);
1495 if (MTBSF == mt_op || MTBSFM == mt_op) {
1498 mt_count = -mt_count;
1501 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1502 tape->merge_bh_size = 0;
1503 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1505 ide_tape_discard_merge_buffer(drive, 0);
1511 idetape_create_space_cmd(&pc, mt_count - count,
1512 IDETAPE_SPACE_OVER_FILEMARK);
1513 return ide_queue_pc_tail(drive, disk, &pc);
1518 retval = idetape_space_over_filemarks(drive, MTFSF,
1522 count = (MTBSFM == mt_op ? 1 : -1);
1523 return idetape_space_over_filemarks(drive, MTFSF, count);
1525 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1532 * Our character device read / write functions.
1534 * The tape is optimized to maximize throughput when it is transferring an
1535 * integral number of the "continuous transfer limit", which is a parameter of
1536 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1538 * As of version 1.3 of the driver, the character device provides an abstract
1539 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1540 * same backup/restore procedure is supported. The driver will internally
1541 * convert the requests to the recommended transfer unit, so that an unmatch
1542 * between the user's block size to the recommended size will only result in a
1543 * (slightly) increased driver overhead, but will no longer hit performance.
1544 * This is not applicable to Onstream.
1546 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1547 size_t count, loff_t *ppos)
1549 struct ide_tape_obj *tape = ide_tape_f(file);
1550 ide_drive_t *drive = tape->drive;
1551 ssize_t bytes_read, temp, actually_read = 0, rc;
1553 u16 ctl = *(u16 *)&tape->caps[12];
1555 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1557 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1558 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1559 if (count > tape->blk_size &&
1560 (count % tape->blk_size) == 0)
1561 tape->user_bs_factor = count / tape->blk_size;
1563 rc = idetape_init_read(drive);
1568 if (tape->merge_bh_size) {
1569 actually_read = min((unsigned int)(tape->merge_bh_size),
1570 (unsigned int)count);
1571 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1573 buf += actually_read;
1574 tape->merge_bh_size -= actually_read;
1575 count -= actually_read;
1577 while (count >= tape->buffer_size) {
1578 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1579 if (bytes_read <= 0)
1581 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1584 count -= bytes_read;
1585 actually_read += bytes_read;
1588 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1589 if (bytes_read <= 0)
1591 temp = min((unsigned long)count, (unsigned long)bytes_read);
1592 if (idetape_copy_stage_to_user(tape, buf, temp))
1594 actually_read += temp;
1595 tape->merge_bh_size = bytes_read-temp;
1598 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1599 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1601 idetape_space_over_filemarks(drive, MTFSF, 1);
1605 return ret ? ret : actually_read;
1608 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1609 size_t count, loff_t *ppos)
1611 struct ide_tape_obj *tape = ide_tape_f(file);
1612 ide_drive_t *drive = tape->drive;
1613 ssize_t actually_written = 0;
1615 u16 ctl = *(u16 *)&tape->caps[12];
1617 /* The drive is write protected. */
1618 if (tape->write_prot)
1621 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1623 /* Initialize write operation */
1624 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1625 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1626 ide_tape_discard_merge_buffer(drive, 1);
1627 if (tape->merge_bh || tape->merge_bh_size) {
1628 printk(KERN_ERR "ide-tape: merge_bh_size "
1629 "should be 0 now\n");
1630 tape->merge_bh_size = 0;
1632 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1633 if (!tape->merge_bh)
1635 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1636 idetape_init_merge_buffer(tape);
1639 * Issue a write 0 command to ensure that DSC handshake is
1640 * switched from completion mode to buffer available mode. No
1641 * point in issuing this if DSC overlap isn't supported, some
1642 * drives (Seagate STT3401A) will return an error.
1644 if (drive->dsc_overlap) {
1645 ssize_t retval = idetape_queue_rw_tail(drive,
1646 REQ_IDETAPE_WRITE, 0,
1649 ide_tape_kfree_buffer(tape);
1650 tape->merge_bh = NULL;
1651 tape->chrdev_dir = IDETAPE_DIR_NONE;
1658 if (tape->merge_bh_size) {
1659 if (tape->merge_bh_size >= tape->buffer_size) {
1660 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1661 tape->merge_bh_size = 0;
1663 actually_written = min((unsigned int)
1664 (tape->buffer_size - tape->merge_bh_size),
1665 (unsigned int)count);
1666 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1668 buf += actually_written;
1669 tape->merge_bh_size += actually_written;
1670 count -= actually_written;
1672 if (tape->merge_bh_size == tape->buffer_size) {
1674 tape->merge_bh_size = 0;
1675 retval = idetape_add_chrdev_write_request(drive, ctl);
1680 while (count >= tape->buffer_size) {
1682 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1684 buf += tape->buffer_size;
1685 count -= tape->buffer_size;
1686 retval = idetape_add_chrdev_write_request(drive, ctl);
1687 actually_written += tape->buffer_size;
1692 actually_written += count;
1693 if (idetape_copy_stage_from_user(tape, buf, count))
1695 tape->merge_bh_size += count;
1697 return ret ? ret : actually_written;
1700 static int idetape_write_filemark(ide_drive_t *drive)
1702 struct ide_tape_obj *tape = drive->driver_data;
1703 struct ide_atapi_pc pc;
1705 /* Write a filemark */
1706 idetape_create_write_filemark_cmd(drive, &pc, 1);
1707 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1708 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1715 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1718 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1719 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1720 * usually not supported.
1722 * The following commands are currently not supported:
1724 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1725 * MT_ST_WRITE_THRESHOLD.
1727 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1729 idetape_tape_t *tape = drive->driver_data;
1730 struct gendisk *disk = tape->disk;
1731 struct ide_atapi_pc pc;
1734 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1744 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1751 if (tape->write_prot)
1753 ide_tape_discard_merge_buffer(drive, 1);
1754 for (i = 0; i < mt_count; i++) {
1755 retval = idetape_write_filemark(drive);
1761 ide_tape_discard_merge_buffer(drive, 0);
1762 if (idetape_rewind_tape(drive))
1766 ide_tape_discard_merge_buffer(drive, 0);
1767 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1771 * If door is locked, attempt to unlock before
1772 * attempting to eject.
1774 if (tape->door_locked) {
1775 if (!ide_set_media_lock(drive, disk, 0))
1776 tape->door_locked = DOOR_UNLOCKED;
1778 ide_tape_discard_merge_buffer(drive, 0);
1779 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1781 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1784 ide_tape_discard_merge_buffer(drive, 0);
1785 return idetape_flush_tape_buffers(drive);
1787 ide_tape_discard_merge_buffer(drive, 0);
1788 return ide_do_start_stop(drive, disk,
1789 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1791 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1792 return ide_queue_pc_tail(drive, disk, &pc);
1794 (void)idetape_rewind_tape(drive);
1795 idetape_create_erase_cmd(&pc);
1796 return ide_queue_pc_tail(drive, disk, &pc);
1799 if (mt_count < tape->blk_size ||
1800 mt_count % tape->blk_size)
1802 tape->user_bs_factor = mt_count / tape->blk_size;
1803 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1805 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1808 ide_tape_discard_merge_buffer(drive, 0);
1809 return idetape_position_tape(drive,
1810 mt_count * tape->user_bs_factor, tape->partition, 0);
1812 ide_tape_discard_merge_buffer(drive, 0);
1813 return idetape_position_tape(drive, 0, mt_count, 0);
1817 retval = ide_set_media_lock(drive, disk, 1);
1820 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1823 retval = ide_set_media_lock(drive, disk, 0);
1826 tape->door_locked = DOOR_UNLOCKED;
1829 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1836 * Our character device ioctls. General mtio.h magnetic io commands are
1837 * supported here, and not in the corresponding block interface. Our own
1838 * ide-tape ioctls are supported on both interfaces.
1840 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1841 unsigned int cmd, unsigned long arg)
1843 struct ide_tape_obj *tape = ide_tape_f(file);
1844 ide_drive_t *drive = tape->drive;
1848 int block_offset = 0, position = tape->first_frame;
1849 void __user *argp = (void __user *)arg;
1851 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1853 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1854 ide_tape_flush_merge_buffer(drive);
1855 idetape_flush_tape_buffers(drive);
1857 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1858 block_offset = tape->merge_bh_size /
1859 (tape->blk_size * tape->user_bs_factor);
1860 position = idetape_read_position(drive);
1866 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1868 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1870 memset(&mtget, 0, sizeof(struct mtget));
1871 mtget.mt_type = MT_ISSCSI2;
1872 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1874 ((tape->blk_size * tape->user_bs_factor)
1875 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1877 if (tape->drv_write_prot)
1878 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1880 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1884 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1885 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1889 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1890 ide_tape_discard_merge_buffer(drive, 1);
1891 return idetape_blkdev_ioctl(drive, cmd, arg);
1896 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1897 * block size with the reported value.
1899 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1901 idetape_tape_t *tape = drive->driver_data;
1902 struct ide_atapi_pc pc;
1904 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1905 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1906 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1907 if (tape->blk_size == 0) {
1908 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1909 "block size, assuming 32k\n");
1910 tape->blk_size = 32768;
1914 tape->blk_size = (pc.buf[4 + 5] << 16) +
1915 (pc.buf[4 + 6] << 8) +
1917 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1920 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1922 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1924 idetape_tape_t *tape;
1927 if (i >= MAX_HWIFS * MAX_DRIVES)
1931 tape = ide_tape_chrdev_get(i);
1937 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1940 * We really want to do nonseekable_open(inode, filp); here, but some
1941 * versions of tar incorrectly call lseek on tapes and bail out if that
1942 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1944 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1946 drive = tape->drive;
1948 filp->private_data = tape;
1950 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1955 retval = idetape_wait_ready(drive, 60 * HZ);
1957 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1958 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1962 idetape_read_position(drive);
1963 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1964 (void)idetape_rewind_tape(drive);
1966 /* Read block size and write protect status from drive. */
1967 ide_tape_get_bsize_from_bdesc(drive);
1969 /* Set write protect flag if device is opened as read-only. */
1970 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1971 tape->write_prot = 1;
1973 tape->write_prot = tape->drv_write_prot;
1975 /* Make sure drive isn't write protected if user wants to write. */
1976 if (tape->write_prot) {
1977 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1978 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1979 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1985 /* Lock the tape drive door so user can't eject. */
1986 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1987 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1988 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1989 tape->door_locked = DOOR_LOCKED;
2001 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2003 idetape_tape_t *tape = drive->driver_data;
2005 ide_tape_flush_merge_buffer(drive);
2006 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2007 if (tape->merge_bh != NULL) {
2008 idetape_pad_zeros(drive, tape->blk_size *
2009 (tape->user_bs_factor - 1));
2010 ide_tape_kfree_buffer(tape);
2011 tape->merge_bh = NULL;
2013 idetape_write_filemark(drive);
2014 idetape_flush_tape_buffers(drive);
2015 idetape_flush_tape_buffers(drive);
2018 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2020 struct ide_tape_obj *tape = ide_tape_f(filp);
2021 ide_drive_t *drive = tape->drive;
2022 unsigned int minor = iminor(inode);
2025 tape = drive->driver_data;
2027 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2029 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2030 idetape_write_release(drive, minor);
2031 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2033 ide_tape_discard_merge_buffer(drive, 1);
2036 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2037 (void) idetape_rewind_tape(drive);
2038 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2039 if (tape->door_locked == DOOR_LOCKED) {
2040 if (!ide_set_media_lock(drive, tape->disk, 0))
2041 tape->door_locked = DOOR_UNLOCKED;
2044 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2050 static void idetape_get_inquiry_results(ide_drive_t *drive)
2052 idetape_tape_t *tape = drive->driver_data;
2053 struct ide_atapi_pc pc;
2054 char fw_rev[4], vendor_id[8], product_id[16];
2056 idetape_create_inquiry_cmd(&pc);
2057 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2058 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2062 memcpy(vendor_id, &pc.buf[8], 8);
2063 memcpy(product_id, &pc.buf[16], 16);
2064 memcpy(fw_rev, &pc.buf[32], 4);
2066 ide_fixstring(vendor_id, 8, 0);
2067 ide_fixstring(product_id, 16, 0);
2068 ide_fixstring(fw_rev, 4, 0);
2070 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2071 drive->name, tape->name, vendor_id, product_id, fw_rev);
2075 * Ask the tape about its various parameters. In particular, we will adjust our
2076 * data transfer buffer size to the recommended value as returned by the tape.
2078 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2080 idetape_tape_t *tape = drive->driver_data;
2081 struct ide_atapi_pc pc;
2083 u8 speed, max_speed;
2085 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2086 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2087 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2088 " some default values\n");
2089 tape->blk_size = 512;
2090 put_unaligned(52, (u16 *)&tape->caps[12]);
2091 put_unaligned(540, (u16 *)&tape->caps[14]);
2092 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2095 caps = pc.buf + 4 + pc.buf[3];
2097 /* convert to host order and save for later use */
2098 speed = be16_to_cpup((__be16 *)&caps[14]);
2099 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2101 *(u16 *)&caps[8] = max_speed;
2102 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2103 *(u16 *)&caps[14] = speed;
2104 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2107 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2108 "(assuming 650KB/sec)\n", drive->name);
2109 *(u16 *)&caps[14] = 650;
2112 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2113 "(assuming 650KB/sec)\n", drive->name);
2114 *(u16 *)&caps[8] = 650;
2117 memcpy(&tape->caps, caps, 20);
2119 /* device lacks locking support according to capabilities page */
2120 if ((caps[6] & 1) == 0)
2121 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2124 tape->blk_size = 512;
2125 else if (caps[7] & 0x04)
2126 tape->blk_size = 1024;
2129 #ifdef CONFIG_IDE_PROC_FS
2130 #define ide_tape_devset_get(name, field) \
2131 static int get_##name(ide_drive_t *drive) \
2133 idetape_tape_t *tape = drive->driver_data; \
2134 return tape->field; \
2137 #define ide_tape_devset_set(name, field) \
2138 static int set_##name(ide_drive_t *drive, int arg) \
2140 idetape_tape_t *tape = drive->driver_data; \
2141 tape->field = arg; \
2145 #define ide_tape_devset_rw_field(_name, _field) \
2146 ide_tape_devset_get(_name, _field) \
2147 ide_tape_devset_set(_name, _field) \
2148 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2150 #define ide_tape_devset_r_field(_name, _field) \
2151 ide_tape_devset_get(_name, _field) \
2152 IDE_DEVSET(_name, 0, get_##_name, NULL)
2154 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2155 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2156 static int divf_buffer(ide_drive_t *drive) { return 2; }
2157 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2159 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2161 ide_tape_devset_rw_field(debug_mask, debug_mask);
2162 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2164 ide_tape_devset_r_field(avg_speed, avg_speed);
2165 ide_tape_devset_r_field(speed, caps[14]);
2166 ide_tape_devset_r_field(buffer, caps[16]);
2167 ide_tape_devset_r_field(buffer_size, buffer_size);
2169 static const struct ide_proc_devset idetape_settings[] = {
2170 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2171 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2172 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2173 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2174 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2175 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2176 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2177 mulf_tdsc, divf_tdsc),
2183 * The function below is called to:
2185 * 1. Initialize our various state variables.
2186 * 2. Ask the tape for its capabilities.
2187 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2188 * is chosen based on the recommendation which we received in step 2.
2190 * Note that at this point ide.c already assigned us an irq, so that we can
2191 * queue requests here and wait for their completion.
2193 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2199 u16 *ctl = (u16 *)&tape->caps[12];
2201 drive->pc_callback = ide_tape_callback;
2202 drive->pc_update_buffers = idetape_update_buffers;
2203 drive->pc_io_buffers = ide_tape_io_buffers;
2205 spin_lock_init(&tape->lock);
2206 drive->dsc_overlap = 1;
2207 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2208 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2210 drive->dsc_overlap = 0;
2212 /* Seagate Travan drives do not support DSC overlap. */
2213 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2214 drive->dsc_overlap = 0;
2215 tape->minor = minor;
2216 tape->name[0] = 'h';
2217 tape->name[1] = 't';
2218 tape->name[2] = '0' + minor;
2219 tape->chrdev_dir = IDETAPE_DIR_NONE;
2221 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2223 /* Command packet DRQ type */
2224 if (((gcw[0] & 0x60) >> 5) == 1)
2225 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2227 idetape_get_inquiry_results(drive);
2228 idetape_get_mode_sense_results(drive);
2229 ide_tape_get_bsize_from_bdesc(drive);
2230 tape->user_bs_factor = 1;
2231 tape->buffer_size = *ctl * tape->blk_size;
2232 while (tape->buffer_size > 0xffff) {
2233 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2235 tape->buffer_size = *ctl * tape->blk_size;
2237 buffer_size = tape->buffer_size;
2238 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2239 if (buffer_size % PAGE_SIZE) {
2240 tape->pages_per_buffer++;
2241 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2244 /* select the "best" DSC read/write polling freq */
2245 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2247 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2250 * Ensure that the number we got makes sense; limit it within
2251 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2253 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2254 IDETAPE_DSC_RW_MAX);
2255 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2257 drive->name, tape->name, *(u16 *)&tape->caps[14],
2258 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2259 tape->buffer_size / 1024,
2260 tape->best_dsc_rw_freq * 1000 / HZ,
2261 drive->using_dma ? ", DMA":"");
2263 ide_proc_register_driver(drive, tape->driver);
2266 static void ide_tape_remove(ide_drive_t *drive)
2268 idetape_tape_t *tape = drive->driver_data;
2270 ide_proc_unregister_driver(drive, tape->driver);
2272 ide_unregister_region(tape->disk);
2277 static void ide_tape_release(struct kref *kref)
2279 struct ide_tape_obj *tape = to_ide_tape(kref);
2280 ide_drive_t *drive = tape->drive;
2281 struct gendisk *g = tape->disk;
2283 BUG_ON(tape->merge_bh_size);
2285 drive->dsc_overlap = 0;
2286 drive->driver_data = NULL;
2287 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2288 device_destroy(idetape_sysfs_class,
2289 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2290 idetape_devs[tape->minor] = NULL;
2291 g->private_data = NULL;
2296 #ifdef CONFIG_IDE_PROC_FS
2297 static int proc_idetape_read_name
2298 (char *page, char **start, off_t off, int count, int *eof, void *data)
2300 ide_drive_t *drive = (ide_drive_t *) data;
2301 idetape_tape_t *tape = drive->driver_data;
2305 len = sprintf(out, "%s\n", tape->name);
2306 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2309 static ide_proc_entry_t idetape_proc[] = {
2310 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2311 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2312 { NULL, 0, NULL, NULL }
2316 static int ide_tape_probe(ide_drive_t *);
2318 static ide_driver_t idetape_driver = {
2320 .owner = THIS_MODULE,
2322 .bus = &ide_bus_type,
2324 .probe = ide_tape_probe,
2325 .remove = ide_tape_remove,
2326 .version = IDETAPE_VERSION,
2328 .do_request = idetape_do_request,
2329 .end_request = idetape_end_request,
2330 .error = __ide_error,
2331 #ifdef CONFIG_IDE_PROC_FS
2332 .proc = idetape_proc,
2333 .settings = idetape_settings,
2337 /* Our character device supporting functions, passed to register_chrdev. */
2338 static const struct file_operations idetape_fops = {
2339 .owner = THIS_MODULE,
2340 .read = idetape_chrdev_read,
2341 .write = idetape_chrdev_write,
2342 .ioctl = idetape_chrdev_ioctl,
2343 .open = idetape_chrdev_open,
2344 .release = idetape_chrdev_release,
2347 static int idetape_open(struct inode *inode, struct file *filp)
2349 struct gendisk *disk = inode->i_bdev->bd_disk;
2350 struct ide_tape_obj *tape;
2352 tape = ide_tape_get(disk);
2359 static int idetape_release(struct inode *inode, struct file *filp)
2361 struct gendisk *disk = inode->i_bdev->bd_disk;
2362 struct ide_tape_obj *tape = ide_tape_g(disk);
2369 static int idetape_ioctl(struct inode *inode, struct file *file,
2370 unsigned int cmd, unsigned long arg)
2372 struct block_device *bdev = inode->i_bdev;
2373 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2374 ide_drive_t *drive = tape->drive;
2375 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2377 err = idetape_blkdev_ioctl(drive, cmd, arg);
2381 static struct block_device_operations idetape_block_ops = {
2382 .owner = THIS_MODULE,
2383 .open = idetape_open,
2384 .release = idetape_release,
2385 .ioctl = idetape_ioctl,
2388 static int ide_tape_probe(ide_drive_t *drive)
2390 idetape_tape_t *tape;
2394 if (!strstr("ide-tape", drive->driver_req))
2397 if (drive->media != ide_tape)
2400 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2401 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2402 " the driver\n", drive->name);
2405 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2407 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2412 g = alloc_disk(1 << PARTN_BITS);
2416 ide_init_disk(g, drive);
2418 kref_init(&tape->kref);
2420 tape->drive = drive;
2421 tape->driver = &idetape_driver;
2424 g->private_data = &tape->driver;
2426 drive->driver_data = tape;
2428 mutex_lock(&idetape_ref_mutex);
2429 for (minor = 0; idetape_devs[minor]; minor++)
2431 idetape_devs[minor] = tape;
2432 mutex_unlock(&idetape_ref_mutex);
2434 idetape_setup(drive, tape, minor);
2436 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2437 MKDEV(IDETAPE_MAJOR, minor), NULL,
2439 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2440 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2443 g->fops = &idetape_block_ops;
2444 ide_register_region(g);
2454 static void __exit idetape_exit(void)
2456 driver_unregister(&idetape_driver.gen_driver);
2457 class_destroy(idetape_sysfs_class);
2458 unregister_chrdev(IDETAPE_MAJOR, "ht");
2461 static int __init idetape_init(void)
2464 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2465 if (IS_ERR(idetape_sysfs_class)) {
2466 idetape_sysfs_class = NULL;
2467 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2472 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2473 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2476 goto out_free_class;
2479 error = driver_register(&idetape_driver.gen_driver);
2481 goto out_free_driver;
2486 driver_unregister(&idetape_driver.gen_driver);
2488 class_destroy(idetape_sysfs_class);
2493 MODULE_ALIAS("ide:*m-tape*");
2494 module_init(idetape_init);
2495 module_exit(idetape_exit);
2496 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2497 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2498 MODULE_LICENSE("GPL");