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 * This is the usual interrupt handler which will be called during a packet
623 * command. We will transfer some of the data (as requested by the drive) and
624 * will re-point interrupt handler to us. When data transfer is finished, we
625 * will act according to the algorithm described before
628 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
630 return ide_pc_intr(drive, idetape_pc_intr);
634 * Packet Command Interface
636 * The current Packet Command is available in drive->pc, and will not change
637 * until we finish handling it. Each packet command is associated with a
638 * callback function that will be called when the command is finished.
640 * The handling will be done in three stages:
642 * 1. idetape_issue_pc will send the packet command to the drive, and will set
643 * the interrupt handler to idetape_pc_intr.
645 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
646 * repeated until the device signals us that no more interrupts will be issued.
648 * 3. ATAPI Tape media access commands have immediate status with a delayed
649 * process. In case of a successful initiation of a media access packet command,
650 * the DSC bit will be set when the actual execution of the command is finished.
651 * Since the tape drive will not issue an interrupt, we have to poll for this
652 * event. In this case, we define the request as "low priority request" by
653 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
656 * ide.c will then give higher priority to requests which originate from the
657 * other device, until will change rq_status to RQ_ACTIVE.
659 * 4. When the packet command is finished, it will be checked for errors.
661 * 5. In case an error was found, we queue a request sense packet command in
662 * front of the request queue and retry the operation up to
663 * IDETAPE_MAX_PC_RETRIES times.
665 * 6. In case no error was found, or we decided to give up and not to retry
666 * again, the callback function will be called and then we will handle the next
669 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
671 return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL);
674 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
675 struct ide_atapi_pc *pc)
677 idetape_tape_t *tape = drive->driver_data;
679 if (drive->pc->c[0] == REQUEST_SENSE &&
680 pc->c[0] == REQUEST_SENSE) {
681 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
682 "Two request sense in serial were issued\n");
685 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
686 tape->failed_pc = pc;
688 /* Set the current packet command */
691 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
692 (pc->flags & PC_FLAG_ABORT)) {
694 * We will "abort" retrying a packet command in case legitimate
695 * error code was received (crossing a filemark, or end of the
696 * media, for example).
698 if (!(pc->flags & PC_FLAG_ABORT)) {
699 if (!(pc->c[0] == TEST_UNIT_READY &&
700 tape->sense_key == 2 && tape->asc == 4 &&
701 (tape->ascq == 1 || tape->ascq == 8))) {
702 printk(KERN_ERR "ide-tape: %s: I/O error, "
703 "pc = %2x, key = %2x, "
704 "asc = %2x, ascq = %2x\n",
705 tape->name, pc->c[0],
706 tape->sense_key, tape->asc,
710 pc->error = IDETAPE_ERROR_GENERAL;
712 tape->failed_pc = NULL;
713 drive->pc_callback(drive, 0);
716 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
720 return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
723 /* A mode sense command is used to "sense" tape parameters. */
724 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
727 pc->c[0] = MODE_SENSE;
728 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
729 /* DBD = 1 - Don't return block descriptors */
731 pc->c[2] = page_code;
733 * Changed pc->c[3] to 0 (255 will at best return unused info).
735 * For SCSI this byte is defined as subpage instead of high byte
736 * of length and some IDE drives seem to interpret it this way
737 * and return an error when 255 is used.
740 /* We will just discard data in that case */
742 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
744 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
750 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
752 ide_hwif_t *hwif = drive->hwif;
753 idetape_tape_t *tape = drive->driver_data;
754 struct ide_atapi_pc *pc = drive->pc;
757 stat = hwif->tp_ops->read_status(hwif);
759 if (stat & ATA_DSC) {
760 if (stat & ATA_ERR) {
762 if (pc->c[0] != TEST_UNIT_READY)
763 printk(KERN_ERR "ide-tape: %s: I/O error, ",
765 /* Retry operation */
766 ide_retry_pc(drive, tape->disk);
771 pc->error = IDETAPE_ERROR_GENERAL;
772 tape->failed_pc = NULL;
774 drive->pc_callback(drive, 0);
778 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
779 struct ide_atapi_pc *pc, struct request *rq,
782 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
783 unsigned int length = rq->current_nr_sectors;
786 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
790 pc->buf_size = length * tape->blk_size;
791 pc->req_xfer = pc->buf_size;
792 if (pc->req_xfer == tape->buffer_size)
793 pc->flags |= PC_FLAG_DMA_OK;
795 if (opcode == READ_6) {
797 atomic_set(&bh->b_count, 0);
798 } else if (opcode == WRITE_6) {
800 pc->flags |= PC_FLAG_WRITING;
801 pc->b_data = bh->b_data;
802 pc->b_count = atomic_read(&bh->b_count);
805 memcpy(rq->cmd, pc->c, 12);
808 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
809 struct request *rq, sector_t block)
811 ide_hwif_t *hwif = drive->hwif;
812 idetape_tape_t *tape = drive->driver_data;
813 struct ide_atapi_pc *pc = NULL;
814 struct request *postponed_rq = tape->postponed_rq;
817 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
818 " current_nr_sectors: %u\n",
819 (unsigned long long)rq->sector, rq->nr_sectors,
820 rq->current_nr_sectors);
822 if (!blk_special_request(rq)) {
823 /* We do not support buffer cache originated requests. */
824 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
825 "request queue (%d)\n", drive->name, rq->cmd_type);
826 ide_end_request(drive, 0, 0);
830 /* Retry a failed packet command */
831 if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
832 pc = tape->failed_pc;
836 if (postponed_rq != NULL)
837 if (rq != postponed_rq) {
838 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
839 "Two DSC requests were queued\n");
840 idetape_end_request(drive, 0, 0);
844 tape->postponed_rq = NULL;
847 * If the tape is still busy, postpone our request and service
848 * the other device meanwhile.
850 stat = hwif->tp_ops->read_status(hwif);
852 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
853 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
855 if (drive->post_reset == 1) {
856 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
857 drive->post_reset = 0;
860 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
861 (stat & ATA_DSC) == 0) {
862 if (postponed_rq == NULL) {
863 tape->dsc_polling_start = jiffies;
864 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
865 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
866 } else if (time_after(jiffies, tape->dsc_timeout)) {
867 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
869 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
870 idetape_media_access_finished(drive);
873 return ide_do_reset(drive);
875 } else if (time_after(jiffies,
876 tape->dsc_polling_start +
877 IDETAPE_DSC_MA_THRESHOLD))
878 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
879 idetape_postpone_request(drive);
882 if (rq->cmd[13] & REQ_IDETAPE_READ) {
883 pc = &tape->queued_pc;
884 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
887 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
888 pc = &tape->queued_pc;
889 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
892 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
893 pc = (struct ide_atapi_pc *) rq->buffer;
894 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
895 rq->cmd[13] |= REQ_IDETAPE_PC2;
898 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
899 idetape_media_access_finished(drive);
905 return idetape_issue_pc(drive, pc);
909 * The function below uses __get_free_pages to allocate a data buffer of size
910 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
913 * It returns a pointer to the newly allocated buffer, or NULL in case of
916 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
919 struct idetape_bh *prev_bh, *bh, *merge_bh;
920 int pages = tape->pages_per_buffer;
921 unsigned int order, b_allocd;
924 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
929 order = fls(pages) - 1;
930 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
933 b_allocd = (1 << order) * PAGE_SIZE;
937 memset(bh->b_data, 0, b_allocd);
938 bh->b_reqnext = NULL;
939 bh->b_size = b_allocd;
940 atomic_set(&bh->b_count, full ? bh->b_size : 0);
943 order = fls(pages) - 1;
944 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
947 b_allocd = (1 << order) * PAGE_SIZE;
950 memset(b_data, 0, b_allocd);
952 /* newly allocated page frames below buffer header or ...*/
953 if (bh->b_data == b_data + b_allocd) {
954 bh->b_size += b_allocd;
955 bh->b_data -= b_allocd;
957 atomic_add(b_allocd, &bh->b_count);
960 /* they are above the header */
961 if (b_data == bh->b_data + bh->b_size) {
962 bh->b_size += b_allocd;
964 atomic_add(b_allocd, &bh->b_count);
968 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
970 free_pages((unsigned long) b_data, order);
973 bh->b_reqnext = NULL;
975 bh->b_size = b_allocd;
976 atomic_set(&bh->b_count, full ? bh->b_size : 0);
977 prev_bh->b_reqnext = bh;
982 bh->b_size -= tape->excess_bh_size;
984 atomic_sub(tape->excess_bh_size, &bh->b_count);
987 ide_tape_kfree_buffer(tape);
991 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
992 const char __user *buf, int n)
994 struct idetape_bh *bh = tape->bh;
1000 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1004 count = min((unsigned int)
1005 (bh->b_size - atomic_read(&bh->b_count)),
1007 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1011 atomic_add(count, &bh->b_count);
1013 if (atomic_read(&bh->b_count) == bh->b_size) {
1016 atomic_set(&bh->b_count, 0);
1023 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1026 struct idetape_bh *bh = tape->bh;
1032 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1036 count = min(tape->b_count, n);
1037 if (copy_to_user(buf, tape->b_data, count))
1040 tape->b_data += count;
1041 tape->b_count -= count;
1043 if (!tape->b_count) {
1047 tape->b_data = bh->b_data;
1048 tape->b_count = atomic_read(&bh->b_count);
1055 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1057 struct idetape_bh *bh = tape->merge_bh;
1058 tape->bh = tape->merge_bh;
1060 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1061 atomic_set(&bh->b_count, 0);
1063 tape->b_data = bh->b_data;
1064 tape->b_count = atomic_read(&bh->b_count);
1069 * Write a filemark if write_filemark=1. Flush the device buffers without
1070 * writing a filemark otherwise.
1072 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1073 struct ide_atapi_pc *pc, int write_filemark)
1076 pc->c[0] = WRITE_FILEMARKS;
1077 pc->c[4] = write_filemark;
1078 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1081 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1083 idetape_tape_t *tape = drive->driver_data;
1084 struct gendisk *disk = tape->disk;
1085 int load_attempted = 0;
1087 /* Wait for the tape to become ready */
1088 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1090 while (time_before(jiffies, timeout)) {
1091 if (ide_do_test_unit_ready(drive, disk) == 0)
1093 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1094 || (tape->asc == 0x3A)) {
1098 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1100 /* not about to be ready */
1101 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1102 (tape->ascq == 1 || tape->ascq == 8)))
1109 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1111 struct ide_tape_obj *tape = drive->driver_data;
1112 struct ide_atapi_pc pc;
1115 idetape_create_write_filemark_cmd(drive, &pc, 0);
1116 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1119 idetape_wait_ready(drive, 60 * 5 * HZ);
1123 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1126 pc->c[0] = READ_POSITION;
1130 static int idetape_read_position(ide_drive_t *drive)
1132 idetape_tape_t *tape = drive->driver_data;
1133 struct ide_atapi_pc pc;
1136 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1138 idetape_create_read_position_cmd(&pc);
1139 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1141 position = tape->first_frame;
1145 static void idetape_create_locate_cmd(ide_drive_t *drive,
1146 struct ide_atapi_pc *pc,
1147 unsigned int block, u8 partition, int skip)
1150 pc->c[0] = POSITION_TO_ELEMENT;
1152 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1153 pc->c[8] = partition;
1154 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1157 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1159 idetape_tape_t *tape = drive->driver_data;
1161 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1164 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1165 tape->merge_bh_size = 0;
1166 if (tape->merge_bh != NULL) {
1167 ide_tape_kfree_buffer(tape);
1168 tape->merge_bh = NULL;
1171 tape->chrdev_dir = IDETAPE_DIR_NONE;
1175 * Position the tape to the requested block using the LOCATE packet command.
1176 * A READ POSITION command is then issued to check where we are positioned. Like
1177 * all higher level operations, we queue the commands at the tail of the request
1178 * queue and wait for their completion.
1180 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1181 u8 partition, int skip)
1183 idetape_tape_t *tape = drive->driver_data;
1184 struct gendisk *disk = tape->disk;
1186 struct ide_atapi_pc pc;
1188 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1189 __ide_tape_discard_merge_buffer(drive);
1190 idetape_wait_ready(drive, 60 * 5 * HZ);
1191 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1192 retval = ide_queue_pc_tail(drive, disk, &pc);
1196 idetape_create_read_position_cmd(&pc);
1197 return ide_queue_pc_tail(drive, disk, &pc);
1200 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1201 int restore_position)
1203 idetape_tape_t *tape = drive->driver_data;
1206 __ide_tape_discard_merge_buffer(drive);
1207 if (restore_position) {
1208 position = idetape_read_position(drive);
1209 seek = position > 0 ? position : 0;
1210 if (idetape_position_tape(drive, seek, 0, 0)) {
1211 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1212 " %s\n", tape->name, __func__);
1219 * Generate a read/write request for the block device interface and wait for it
1222 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1223 struct idetape_bh *bh)
1225 idetape_tape_t *tape = drive->driver_data;
1229 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1231 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1232 rq->cmd_type = REQ_TYPE_SPECIAL;
1234 rq->rq_disk = tape->disk;
1235 rq->special = (void *)bh;
1236 rq->sector = tape->first_frame;
1237 rq->nr_sectors = blocks;
1238 rq->current_nr_sectors = blocks;
1239 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1241 errors = rq->errors;
1242 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1243 blk_put_request(rq);
1245 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1249 idetape_init_merge_buffer(tape);
1250 if (errors == IDETAPE_ERROR_GENERAL)
1255 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1263 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1264 struct ide_atapi_pc *pc)
1267 pc->c[0] = REZERO_UNIT;
1268 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1271 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1276 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1279 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1283 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1285 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1288 /* Queue up a character device originated write request. */
1289 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1291 idetape_tape_t *tape = drive->driver_data;
1293 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1295 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1296 blocks, tape->merge_bh);
1299 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1301 idetape_tape_t *tape = drive->driver_data;
1303 struct idetape_bh *bh;
1305 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1306 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1307 " but we are not writing.\n");
1310 if (tape->merge_bh_size > tape->buffer_size) {
1311 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1312 tape->merge_bh_size = tape->buffer_size;
1314 if (tape->merge_bh_size) {
1315 blocks = tape->merge_bh_size / tape->blk_size;
1316 if (tape->merge_bh_size % tape->blk_size) {
1320 i = tape->blk_size - tape->merge_bh_size %
1322 bh = tape->bh->b_reqnext;
1324 atomic_set(&bh->b_count, 0);
1330 printk(KERN_INFO "ide-tape: bug,"
1334 min = min(i, (unsigned int)(bh->b_size -
1335 atomic_read(&bh->b_count)));
1336 memset(bh->b_data + atomic_read(&bh->b_count),
1338 atomic_add(min, &bh->b_count);
1343 (void) idetape_add_chrdev_write_request(drive, blocks);
1344 tape->merge_bh_size = 0;
1346 if (tape->merge_bh != NULL) {
1347 ide_tape_kfree_buffer(tape);
1348 tape->merge_bh = NULL;
1350 tape->chrdev_dir = IDETAPE_DIR_NONE;
1353 static int idetape_init_read(ide_drive_t *drive)
1355 idetape_tape_t *tape = drive->driver_data;
1358 /* Initialize read operation */
1359 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1360 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1361 ide_tape_flush_merge_buffer(drive);
1362 idetape_flush_tape_buffers(drive);
1364 if (tape->merge_bh || tape->merge_bh_size) {
1365 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1367 tape->merge_bh_size = 0;
1369 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1370 if (!tape->merge_bh)
1372 tape->chrdev_dir = IDETAPE_DIR_READ;
1375 * Issue a read 0 command to ensure that DSC handshake is
1376 * switched from completion mode to buffer available mode.
1377 * No point in issuing this if DSC overlap isn't supported, some
1378 * drives (Seagate STT3401A) will return an error.
1380 if (drive->dsc_overlap) {
1381 bytes_read = idetape_queue_rw_tail(drive,
1382 REQ_IDETAPE_READ, 0,
1384 if (bytes_read < 0) {
1385 ide_tape_kfree_buffer(tape);
1386 tape->merge_bh = NULL;
1387 tape->chrdev_dir = IDETAPE_DIR_NONE;
1396 /* called from idetape_chrdev_read() to service a chrdev read request. */
1397 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1399 idetape_tape_t *tape = drive->driver_data;
1401 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1403 /* If we are at a filemark, return a read length of 0 */
1404 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1407 idetape_init_read(drive);
1409 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1413 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1415 idetape_tape_t *tape = drive->driver_data;
1416 struct idetape_bh *bh;
1422 bh = tape->merge_bh;
1423 count = min(tape->buffer_size, bcount);
1425 blocks = count / tape->blk_size;
1427 atomic_set(&bh->b_count,
1428 min(count, (unsigned int)bh->b_size));
1429 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1430 count -= atomic_read(&bh->b_count);
1433 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1439 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1440 * currently support only one partition.
1442 static int idetape_rewind_tape(ide_drive_t *drive)
1444 struct ide_tape_obj *tape = drive->driver_data;
1445 struct gendisk *disk = tape->disk;
1447 struct ide_atapi_pc pc;
1449 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1451 idetape_create_rewind_cmd(drive, &pc);
1452 retval = ide_queue_pc_tail(drive, disk, &pc);
1456 idetape_create_read_position_cmd(&pc);
1457 retval = ide_queue_pc_tail(drive, disk, &pc);
1463 /* mtio.h compatible commands should be issued to the chrdev interface. */
1464 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1467 idetape_tape_t *tape = drive->driver_data;
1468 void __user *argp = (void __user *)arg;
1470 struct idetape_config {
1471 int dsc_rw_frequency;
1472 int dsc_media_access_frequency;
1476 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1480 if (copy_from_user(&config, argp, sizeof(config)))
1482 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1485 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1486 config.nr_stages = 1;
1487 if (copy_to_user(argp, &config, sizeof(config)))
1496 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1499 idetape_tape_t *tape = drive->driver_data;
1500 struct gendisk *disk = tape->disk;
1501 struct ide_atapi_pc pc;
1502 int retval, count = 0;
1503 int sprev = !!(tape->caps[4] & 0x20);
1507 if (MTBSF == mt_op || MTBSFM == mt_op) {
1510 mt_count = -mt_count;
1513 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1514 tape->merge_bh_size = 0;
1515 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1517 ide_tape_discard_merge_buffer(drive, 0);
1523 idetape_create_space_cmd(&pc, mt_count - count,
1524 IDETAPE_SPACE_OVER_FILEMARK);
1525 return ide_queue_pc_tail(drive, disk, &pc);
1530 retval = idetape_space_over_filemarks(drive, MTFSF,
1534 count = (MTBSFM == mt_op ? 1 : -1);
1535 return idetape_space_over_filemarks(drive, MTFSF, count);
1537 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1544 * Our character device read / write functions.
1546 * The tape is optimized to maximize throughput when it is transferring an
1547 * integral number of the "continuous transfer limit", which is a parameter of
1548 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1550 * As of version 1.3 of the driver, the character device provides an abstract
1551 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1552 * same backup/restore procedure is supported. The driver will internally
1553 * convert the requests to the recommended transfer unit, so that an unmatch
1554 * between the user's block size to the recommended size will only result in a
1555 * (slightly) increased driver overhead, but will no longer hit performance.
1556 * This is not applicable to Onstream.
1558 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1559 size_t count, loff_t *ppos)
1561 struct ide_tape_obj *tape = ide_tape_f(file);
1562 ide_drive_t *drive = tape->drive;
1563 ssize_t bytes_read, temp, actually_read = 0, rc;
1565 u16 ctl = *(u16 *)&tape->caps[12];
1567 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1569 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1570 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1571 if (count > tape->blk_size &&
1572 (count % tape->blk_size) == 0)
1573 tape->user_bs_factor = count / tape->blk_size;
1575 rc = idetape_init_read(drive);
1580 if (tape->merge_bh_size) {
1581 actually_read = min((unsigned int)(tape->merge_bh_size),
1582 (unsigned int)count);
1583 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1585 buf += actually_read;
1586 tape->merge_bh_size -= actually_read;
1587 count -= actually_read;
1589 while (count >= tape->buffer_size) {
1590 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1591 if (bytes_read <= 0)
1593 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1596 count -= bytes_read;
1597 actually_read += bytes_read;
1600 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1601 if (bytes_read <= 0)
1603 temp = min((unsigned long)count, (unsigned long)bytes_read);
1604 if (idetape_copy_stage_to_user(tape, buf, temp))
1606 actually_read += temp;
1607 tape->merge_bh_size = bytes_read-temp;
1610 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1611 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1613 idetape_space_over_filemarks(drive, MTFSF, 1);
1617 return ret ? ret : actually_read;
1620 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1621 size_t count, loff_t *ppos)
1623 struct ide_tape_obj *tape = ide_tape_f(file);
1624 ide_drive_t *drive = tape->drive;
1625 ssize_t actually_written = 0;
1627 u16 ctl = *(u16 *)&tape->caps[12];
1629 /* The drive is write protected. */
1630 if (tape->write_prot)
1633 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1635 /* Initialize write operation */
1636 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1637 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1638 ide_tape_discard_merge_buffer(drive, 1);
1639 if (tape->merge_bh || tape->merge_bh_size) {
1640 printk(KERN_ERR "ide-tape: merge_bh_size "
1641 "should be 0 now\n");
1642 tape->merge_bh_size = 0;
1644 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1645 if (!tape->merge_bh)
1647 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1648 idetape_init_merge_buffer(tape);
1651 * Issue a write 0 command to ensure that DSC handshake is
1652 * switched from completion mode to buffer available mode. No
1653 * point in issuing this if DSC overlap isn't supported, some
1654 * drives (Seagate STT3401A) will return an error.
1656 if (drive->dsc_overlap) {
1657 ssize_t retval = idetape_queue_rw_tail(drive,
1658 REQ_IDETAPE_WRITE, 0,
1661 ide_tape_kfree_buffer(tape);
1662 tape->merge_bh = NULL;
1663 tape->chrdev_dir = IDETAPE_DIR_NONE;
1670 if (tape->merge_bh_size) {
1671 if (tape->merge_bh_size >= tape->buffer_size) {
1672 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1673 tape->merge_bh_size = 0;
1675 actually_written = min((unsigned int)
1676 (tape->buffer_size - tape->merge_bh_size),
1677 (unsigned int)count);
1678 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1680 buf += actually_written;
1681 tape->merge_bh_size += actually_written;
1682 count -= actually_written;
1684 if (tape->merge_bh_size == tape->buffer_size) {
1686 tape->merge_bh_size = 0;
1687 retval = idetape_add_chrdev_write_request(drive, ctl);
1692 while (count >= tape->buffer_size) {
1694 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1696 buf += tape->buffer_size;
1697 count -= tape->buffer_size;
1698 retval = idetape_add_chrdev_write_request(drive, ctl);
1699 actually_written += tape->buffer_size;
1704 actually_written += count;
1705 if (idetape_copy_stage_from_user(tape, buf, count))
1707 tape->merge_bh_size += count;
1709 return ret ? ret : actually_written;
1712 static int idetape_write_filemark(ide_drive_t *drive)
1714 struct ide_tape_obj *tape = drive->driver_data;
1715 struct ide_atapi_pc pc;
1717 /* Write a filemark */
1718 idetape_create_write_filemark_cmd(drive, &pc, 1);
1719 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1720 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1727 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1730 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1731 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1732 * usually not supported.
1734 * The following commands are currently not supported:
1736 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1737 * MT_ST_WRITE_THRESHOLD.
1739 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1741 idetape_tape_t *tape = drive->driver_data;
1742 struct gendisk *disk = tape->disk;
1743 struct ide_atapi_pc pc;
1746 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1756 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1763 if (tape->write_prot)
1765 ide_tape_discard_merge_buffer(drive, 1);
1766 for (i = 0; i < mt_count; i++) {
1767 retval = idetape_write_filemark(drive);
1773 ide_tape_discard_merge_buffer(drive, 0);
1774 if (idetape_rewind_tape(drive))
1778 ide_tape_discard_merge_buffer(drive, 0);
1779 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1783 * If door is locked, attempt to unlock before
1784 * attempting to eject.
1786 if (tape->door_locked) {
1787 if (!ide_set_media_lock(drive, disk, 0))
1788 tape->door_locked = DOOR_UNLOCKED;
1790 ide_tape_discard_merge_buffer(drive, 0);
1791 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1793 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1796 ide_tape_discard_merge_buffer(drive, 0);
1797 return idetape_flush_tape_buffers(drive);
1799 ide_tape_discard_merge_buffer(drive, 0);
1800 return ide_do_start_stop(drive, disk,
1801 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1803 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1804 return ide_queue_pc_tail(drive, disk, &pc);
1806 (void)idetape_rewind_tape(drive);
1807 idetape_create_erase_cmd(&pc);
1808 return ide_queue_pc_tail(drive, disk, &pc);
1811 if (mt_count < tape->blk_size ||
1812 mt_count % tape->blk_size)
1814 tape->user_bs_factor = mt_count / tape->blk_size;
1815 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1817 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1820 ide_tape_discard_merge_buffer(drive, 0);
1821 return idetape_position_tape(drive,
1822 mt_count * tape->user_bs_factor, tape->partition, 0);
1824 ide_tape_discard_merge_buffer(drive, 0);
1825 return idetape_position_tape(drive, 0, mt_count, 0);
1829 retval = ide_set_media_lock(drive, disk, 1);
1832 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1835 retval = ide_set_media_lock(drive, disk, 0);
1838 tape->door_locked = DOOR_UNLOCKED;
1841 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1848 * Our character device ioctls. General mtio.h magnetic io commands are
1849 * supported here, and not in the corresponding block interface. Our own
1850 * ide-tape ioctls are supported on both interfaces.
1852 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1853 unsigned int cmd, unsigned long arg)
1855 struct ide_tape_obj *tape = ide_tape_f(file);
1856 ide_drive_t *drive = tape->drive;
1860 int block_offset = 0, position = tape->first_frame;
1861 void __user *argp = (void __user *)arg;
1863 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1865 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1866 ide_tape_flush_merge_buffer(drive);
1867 idetape_flush_tape_buffers(drive);
1869 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1870 block_offset = tape->merge_bh_size /
1871 (tape->blk_size * tape->user_bs_factor);
1872 position = idetape_read_position(drive);
1878 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1880 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1882 memset(&mtget, 0, sizeof(struct mtget));
1883 mtget.mt_type = MT_ISSCSI2;
1884 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1886 ((tape->blk_size * tape->user_bs_factor)
1887 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1889 if (tape->drv_write_prot)
1890 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1892 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1896 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1897 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1901 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1902 ide_tape_discard_merge_buffer(drive, 1);
1903 return idetape_blkdev_ioctl(drive, cmd, arg);
1908 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1909 * block size with the reported value.
1911 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1913 idetape_tape_t *tape = drive->driver_data;
1914 struct ide_atapi_pc pc;
1916 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1917 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1918 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1919 if (tape->blk_size == 0) {
1920 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1921 "block size, assuming 32k\n");
1922 tape->blk_size = 32768;
1926 tape->blk_size = (pc.buf[4 + 5] << 16) +
1927 (pc.buf[4 + 6] << 8) +
1929 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1932 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1934 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1936 idetape_tape_t *tape;
1939 if (i >= MAX_HWIFS * MAX_DRIVES)
1943 tape = ide_tape_chrdev_get(i);
1949 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1952 * We really want to do nonseekable_open(inode, filp); here, but some
1953 * versions of tar incorrectly call lseek on tapes and bail out if that
1954 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1956 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1958 drive = tape->drive;
1960 filp->private_data = tape;
1962 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1967 retval = idetape_wait_ready(drive, 60 * HZ);
1969 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1970 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1974 idetape_read_position(drive);
1975 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1976 (void)idetape_rewind_tape(drive);
1978 /* Read block size and write protect status from drive. */
1979 ide_tape_get_bsize_from_bdesc(drive);
1981 /* Set write protect flag if device is opened as read-only. */
1982 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1983 tape->write_prot = 1;
1985 tape->write_prot = tape->drv_write_prot;
1987 /* Make sure drive isn't write protected if user wants to write. */
1988 if (tape->write_prot) {
1989 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1990 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1991 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1997 /* Lock the tape drive door so user can't eject. */
1998 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1999 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2000 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2001 tape->door_locked = DOOR_LOCKED;
2013 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2015 idetape_tape_t *tape = drive->driver_data;
2017 ide_tape_flush_merge_buffer(drive);
2018 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2019 if (tape->merge_bh != NULL) {
2020 idetape_pad_zeros(drive, tape->blk_size *
2021 (tape->user_bs_factor - 1));
2022 ide_tape_kfree_buffer(tape);
2023 tape->merge_bh = NULL;
2025 idetape_write_filemark(drive);
2026 idetape_flush_tape_buffers(drive);
2027 idetape_flush_tape_buffers(drive);
2030 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2032 struct ide_tape_obj *tape = ide_tape_f(filp);
2033 ide_drive_t *drive = tape->drive;
2034 unsigned int minor = iminor(inode);
2037 tape = drive->driver_data;
2039 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2041 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2042 idetape_write_release(drive, minor);
2043 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2045 ide_tape_discard_merge_buffer(drive, 1);
2048 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2049 (void) idetape_rewind_tape(drive);
2050 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2051 if (tape->door_locked == DOOR_LOCKED) {
2052 if (!ide_set_media_lock(drive, tape->disk, 0))
2053 tape->door_locked = DOOR_UNLOCKED;
2056 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2062 static void idetape_get_inquiry_results(ide_drive_t *drive)
2064 idetape_tape_t *tape = drive->driver_data;
2065 struct ide_atapi_pc pc;
2066 char fw_rev[4], vendor_id[8], product_id[16];
2068 idetape_create_inquiry_cmd(&pc);
2069 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2070 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2074 memcpy(vendor_id, &pc.buf[8], 8);
2075 memcpy(product_id, &pc.buf[16], 16);
2076 memcpy(fw_rev, &pc.buf[32], 4);
2078 ide_fixstring(vendor_id, 8, 0);
2079 ide_fixstring(product_id, 16, 0);
2080 ide_fixstring(fw_rev, 4, 0);
2082 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2083 drive->name, tape->name, vendor_id, product_id, fw_rev);
2087 * Ask the tape about its various parameters. In particular, we will adjust our
2088 * data transfer buffer size to the recommended value as returned by the tape.
2090 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2092 idetape_tape_t *tape = drive->driver_data;
2093 struct ide_atapi_pc pc;
2095 u8 speed, max_speed;
2097 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2098 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2099 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2100 " some default values\n");
2101 tape->blk_size = 512;
2102 put_unaligned(52, (u16 *)&tape->caps[12]);
2103 put_unaligned(540, (u16 *)&tape->caps[14]);
2104 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2107 caps = pc.buf + 4 + pc.buf[3];
2109 /* convert to host order and save for later use */
2110 speed = be16_to_cpup((__be16 *)&caps[14]);
2111 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2113 *(u16 *)&caps[8] = max_speed;
2114 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2115 *(u16 *)&caps[14] = speed;
2116 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2119 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2120 "(assuming 650KB/sec)\n", drive->name);
2121 *(u16 *)&caps[14] = 650;
2124 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2125 "(assuming 650KB/sec)\n", drive->name);
2126 *(u16 *)&caps[8] = 650;
2129 memcpy(&tape->caps, caps, 20);
2131 /* device lacks locking support according to capabilities page */
2132 if ((caps[6] & 1) == 0)
2133 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2136 tape->blk_size = 512;
2137 else if (caps[7] & 0x04)
2138 tape->blk_size = 1024;
2141 #ifdef CONFIG_IDE_PROC_FS
2142 #define ide_tape_devset_get(name, field) \
2143 static int get_##name(ide_drive_t *drive) \
2145 idetape_tape_t *tape = drive->driver_data; \
2146 return tape->field; \
2149 #define ide_tape_devset_set(name, field) \
2150 static int set_##name(ide_drive_t *drive, int arg) \
2152 idetape_tape_t *tape = drive->driver_data; \
2153 tape->field = arg; \
2157 #define ide_tape_devset_rw_field(_name, _field) \
2158 ide_tape_devset_get(_name, _field) \
2159 ide_tape_devset_set(_name, _field) \
2160 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2162 #define ide_tape_devset_r_field(_name, _field) \
2163 ide_tape_devset_get(_name, _field) \
2164 IDE_DEVSET(_name, 0, get_##_name, NULL)
2166 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2167 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2168 static int divf_buffer(ide_drive_t *drive) { return 2; }
2169 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2171 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2173 ide_tape_devset_rw_field(debug_mask, debug_mask);
2174 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2176 ide_tape_devset_r_field(avg_speed, avg_speed);
2177 ide_tape_devset_r_field(speed, caps[14]);
2178 ide_tape_devset_r_field(buffer, caps[16]);
2179 ide_tape_devset_r_field(buffer_size, buffer_size);
2181 static const struct ide_proc_devset idetape_settings[] = {
2182 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2183 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2184 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2185 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2186 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2187 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2188 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2189 mulf_tdsc, divf_tdsc),
2195 * The function below is called to:
2197 * 1. Initialize our various state variables.
2198 * 2. Ask the tape for its capabilities.
2199 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2200 * is chosen based on the recommendation which we received in step 2.
2202 * Note that at this point ide.c already assigned us an irq, so that we can
2203 * queue requests here and wait for their completion.
2205 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2211 u16 *ctl = (u16 *)&tape->caps[12];
2213 drive->pc_callback = ide_tape_callback;
2214 drive->pc_update_buffers = idetape_update_buffers;
2215 drive->pc_io_buffers = ide_tape_io_buffers;
2217 spin_lock_init(&tape->lock);
2218 drive->dsc_overlap = 1;
2219 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2220 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2222 drive->dsc_overlap = 0;
2224 /* Seagate Travan drives do not support DSC overlap. */
2225 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2226 drive->dsc_overlap = 0;
2227 tape->minor = minor;
2228 tape->name[0] = 'h';
2229 tape->name[1] = 't';
2230 tape->name[2] = '0' + minor;
2231 tape->chrdev_dir = IDETAPE_DIR_NONE;
2233 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2235 /* Command packet DRQ type */
2236 if (((gcw[0] & 0x60) >> 5) == 1)
2237 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2239 idetape_get_inquiry_results(drive);
2240 idetape_get_mode_sense_results(drive);
2241 ide_tape_get_bsize_from_bdesc(drive);
2242 tape->user_bs_factor = 1;
2243 tape->buffer_size = *ctl * tape->blk_size;
2244 while (tape->buffer_size > 0xffff) {
2245 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2247 tape->buffer_size = *ctl * tape->blk_size;
2249 buffer_size = tape->buffer_size;
2250 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2251 if (buffer_size % PAGE_SIZE) {
2252 tape->pages_per_buffer++;
2253 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2256 /* select the "best" DSC read/write polling freq */
2257 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2259 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2262 * Ensure that the number we got makes sense; limit it within
2263 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2265 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2266 IDETAPE_DSC_RW_MAX);
2267 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2269 drive->name, tape->name, *(u16 *)&tape->caps[14],
2270 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2271 tape->buffer_size / 1024,
2272 tape->best_dsc_rw_freq * 1000 / HZ,
2273 drive->using_dma ? ", DMA":"");
2275 ide_proc_register_driver(drive, tape->driver);
2278 static void ide_tape_remove(ide_drive_t *drive)
2280 idetape_tape_t *tape = drive->driver_data;
2282 ide_proc_unregister_driver(drive, tape->driver);
2284 ide_unregister_region(tape->disk);
2289 static void ide_tape_release(struct kref *kref)
2291 struct ide_tape_obj *tape = to_ide_tape(kref);
2292 ide_drive_t *drive = tape->drive;
2293 struct gendisk *g = tape->disk;
2295 BUG_ON(tape->merge_bh_size);
2297 drive->dsc_overlap = 0;
2298 drive->driver_data = NULL;
2299 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2300 device_destroy(idetape_sysfs_class,
2301 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2302 idetape_devs[tape->minor] = NULL;
2303 g->private_data = NULL;
2308 #ifdef CONFIG_IDE_PROC_FS
2309 static int proc_idetape_read_name
2310 (char *page, char **start, off_t off, int count, int *eof, void *data)
2312 ide_drive_t *drive = (ide_drive_t *) data;
2313 idetape_tape_t *tape = drive->driver_data;
2317 len = sprintf(out, "%s\n", tape->name);
2318 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2321 static ide_proc_entry_t idetape_proc[] = {
2322 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2323 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2324 { NULL, 0, NULL, NULL }
2328 static int ide_tape_probe(ide_drive_t *);
2330 static ide_driver_t idetape_driver = {
2332 .owner = THIS_MODULE,
2334 .bus = &ide_bus_type,
2336 .probe = ide_tape_probe,
2337 .remove = ide_tape_remove,
2338 .version = IDETAPE_VERSION,
2340 .do_request = idetape_do_request,
2341 .end_request = idetape_end_request,
2342 .error = __ide_error,
2343 #ifdef CONFIG_IDE_PROC_FS
2344 .proc = idetape_proc,
2345 .settings = idetape_settings,
2349 /* Our character device supporting functions, passed to register_chrdev. */
2350 static const struct file_operations idetape_fops = {
2351 .owner = THIS_MODULE,
2352 .read = idetape_chrdev_read,
2353 .write = idetape_chrdev_write,
2354 .ioctl = idetape_chrdev_ioctl,
2355 .open = idetape_chrdev_open,
2356 .release = idetape_chrdev_release,
2359 static int idetape_open(struct inode *inode, struct file *filp)
2361 struct gendisk *disk = inode->i_bdev->bd_disk;
2362 struct ide_tape_obj *tape;
2364 tape = ide_tape_get(disk);
2371 static int idetape_release(struct inode *inode, struct file *filp)
2373 struct gendisk *disk = inode->i_bdev->bd_disk;
2374 struct ide_tape_obj *tape = ide_tape_g(disk);
2381 static int idetape_ioctl(struct inode *inode, struct file *file,
2382 unsigned int cmd, unsigned long arg)
2384 struct block_device *bdev = inode->i_bdev;
2385 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2386 ide_drive_t *drive = tape->drive;
2387 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2389 err = idetape_blkdev_ioctl(drive, cmd, arg);
2393 static struct block_device_operations idetape_block_ops = {
2394 .owner = THIS_MODULE,
2395 .open = idetape_open,
2396 .release = idetape_release,
2397 .ioctl = idetape_ioctl,
2400 static int ide_tape_probe(ide_drive_t *drive)
2402 idetape_tape_t *tape;
2406 if (!strstr("ide-tape", drive->driver_req))
2409 if (drive->media != ide_tape)
2412 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2413 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2414 " the driver\n", drive->name);
2417 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2419 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2424 g = alloc_disk(1 << PARTN_BITS);
2428 ide_init_disk(g, drive);
2430 kref_init(&tape->kref);
2432 tape->drive = drive;
2433 tape->driver = &idetape_driver;
2436 g->private_data = &tape->driver;
2438 drive->driver_data = tape;
2440 mutex_lock(&idetape_ref_mutex);
2441 for (minor = 0; idetape_devs[minor]; minor++)
2443 idetape_devs[minor] = tape;
2444 mutex_unlock(&idetape_ref_mutex);
2446 idetape_setup(drive, tape, minor);
2448 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2449 MKDEV(IDETAPE_MAJOR, minor), NULL,
2451 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2452 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2455 g->fops = &idetape_block_ops;
2456 ide_register_region(g);
2466 static void __exit idetape_exit(void)
2468 driver_unregister(&idetape_driver.gen_driver);
2469 class_destroy(idetape_sysfs_class);
2470 unregister_chrdev(IDETAPE_MAJOR, "ht");
2473 static int __init idetape_init(void)
2476 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2477 if (IS_ERR(idetape_sysfs_class)) {
2478 idetape_sysfs_class = NULL;
2479 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2484 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2485 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2488 goto out_free_class;
2491 error = driver_register(&idetape_driver.gen_driver);
2493 goto out_free_driver;
2498 driver_unregister(&idetape_driver.gen_driver);
2500 class_destroy(idetape_sysfs_class);
2505 MODULE_ALIAS("ide:*m-tape*");
2506 module_init(idetape_init);
2507 module_exit(idetape_exit);
2508 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2509 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2510 MODULE_LICENSE("GPL");