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);
584 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
587 pc->c[0] = REQUEST_SENSE;
593 * idetape_retry_pc is called when an error was detected during the
594 * last packet command. We queue a request sense packet command in
595 * the head of the request list.
597 static void idetape_retry_pc(ide_drive_t *drive)
599 struct ide_tape_obj *tape = drive->driver_data;
600 struct request *rq = &drive->request_sense_rq;
601 struct ide_atapi_pc *pc = &drive->request_sense_pc;
603 (void)ide_read_error(drive);
604 idetape_create_request_sense_cmd(pc);
605 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
606 ide_queue_pc_head(drive, tape->disk, pc, rq);
610 * Postpone the current request so that ide.c will be able to service requests
611 * from another device on the same hwgroup while we are polling for DSC.
613 static void idetape_postpone_request(ide_drive_t *drive)
615 idetape_tape_t *tape = drive->driver_data;
617 debug_log(DBG_PROCS, "Enter %s\n", __func__);
619 tape->postponed_rq = HWGROUP(drive)->rq;
620 ide_stall_queue(drive, tape->dsc_poll_freq);
623 static void ide_tape_handle_dsc(ide_drive_t *drive)
625 idetape_tape_t *tape = drive->driver_data;
627 /* Media access command */
628 tape->dsc_polling_start = jiffies;
629 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
630 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
631 /* Allow ide.c to handle other requests */
632 idetape_postpone_request(drive);
635 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
636 unsigned int bcount, int write)
639 idetape_output_buffers(drive, pc, bcount);
641 idetape_input_buffers(drive, pc, bcount);
647 * This is the usual interrupt handler which will be called during a packet
648 * command. We will transfer some of the data (as requested by the drive) and
649 * will re-point interrupt handler to us. When data transfer is finished, we
650 * will act according to the algorithm described before
653 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
655 return ide_pc_intr(drive, idetape_pc_intr, idetape_update_buffers,
656 idetape_retry_pc, ide_tape_io_buffers);
660 * Packet Command Interface
662 * The current Packet Command is available in drive->pc, and will not change
663 * until we finish handling it. Each packet command is associated with a
664 * callback function that will be called when the command is finished.
666 * The handling will be done in three stages:
668 * 1. idetape_issue_pc will send the packet command to the drive, and will set
669 * the interrupt handler to idetape_pc_intr.
671 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
672 * repeated until the device signals us that no more interrupts will be issued.
674 * 3. ATAPI Tape media access commands have immediate status with a delayed
675 * process. In case of a successful initiation of a media access packet command,
676 * the DSC bit will be set when the actual execution of the command is finished.
677 * Since the tape drive will not issue an interrupt, we have to poll for this
678 * event. In this case, we define the request as "low priority request" by
679 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
682 * ide.c will then give higher priority to requests which originate from the
683 * other device, until will change rq_status to RQ_ACTIVE.
685 * 4. When the packet command is finished, it will be checked for errors.
687 * 5. In case an error was found, we queue a request sense packet command in
688 * front of the request queue and retry the operation up to
689 * IDETAPE_MAX_PC_RETRIES times.
691 * 6. In case no error was found, or we decided to give up and not to retry
692 * again, the callback function will be called and then we will handle the next
695 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
697 return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL);
700 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
701 struct ide_atapi_pc *pc)
703 idetape_tape_t *tape = drive->driver_data;
705 if (drive->pc->c[0] == REQUEST_SENSE &&
706 pc->c[0] == REQUEST_SENSE) {
707 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
708 "Two request sense in serial were issued\n");
711 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
712 tape->failed_pc = pc;
714 /* Set the current packet command */
717 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
718 (pc->flags & PC_FLAG_ABORT)) {
720 * We will "abort" retrying a packet command in case legitimate
721 * error code was received (crossing a filemark, or end of the
722 * media, for example).
724 if (!(pc->flags & PC_FLAG_ABORT)) {
725 if (!(pc->c[0] == TEST_UNIT_READY &&
726 tape->sense_key == 2 && tape->asc == 4 &&
727 (tape->ascq == 1 || tape->ascq == 8))) {
728 printk(KERN_ERR "ide-tape: %s: I/O error, "
729 "pc = %2x, key = %2x, "
730 "asc = %2x, ascq = %2x\n",
731 tape->name, pc->c[0],
732 tape->sense_key, tape->asc,
736 pc->error = IDETAPE_ERROR_GENERAL;
738 tape->failed_pc = NULL;
739 drive->pc_callback(drive, 0);
742 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
746 return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
749 /* A mode sense command is used to "sense" tape parameters. */
750 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
753 pc->c[0] = MODE_SENSE;
754 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
755 /* DBD = 1 - Don't return block descriptors */
757 pc->c[2] = page_code;
759 * Changed pc->c[3] to 0 (255 will at best return unused info).
761 * For SCSI this byte is defined as subpage instead of high byte
762 * of length and some IDE drives seem to interpret it this way
763 * and return an error when 255 is used.
766 /* We will just discard data in that case */
768 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
770 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
776 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
778 ide_hwif_t *hwif = drive->hwif;
779 idetape_tape_t *tape = drive->driver_data;
780 struct ide_atapi_pc *pc = drive->pc;
783 stat = hwif->tp_ops->read_status(hwif);
785 if (stat & ATA_DSC) {
786 if (stat & ATA_ERR) {
788 if (pc->c[0] != TEST_UNIT_READY)
789 printk(KERN_ERR "ide-tape: %s: I/O error, ",
791 /* Retry operation */
792 idetape_retry_pc(drive);
797 pc->error = IDETAPE_ERROR_GENERAL;
798 tape->failed_pc = NULL;
800 drive->pc_callback(drive, 0);
804 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
805 struct ide_atapi_pc *pc, struct request *rq,
808 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
809 unsigned int length = rq->current_nr_sectors;
812 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
816 pc->buf_size = length * tape->blk_size;
817 pc->req_xfer = pc->buf_size;
818 if (pc->req_xfer == tape->buffer_size)
819 pc->flags |= PC_FLAG_DMA_OK;
821 if (opcode == READ_6) {
823 atomic_set(&bh->b_count, 0);
824 } else if (opcode == WRITE_6) {
826 pc->flags |= PC_FLAG_WRITING;
827 pc->b_data = bh->b_data;
828 pc->b_count = atomic_read(&bh->b_count);
831 memcpy(rq->cmd, pc->c, 12);
834 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
835 struct request *rq, sector_t block)
837 ide_hwif_t *hwif = drive->hwif;
838 idetape_tape_t *tape = drive->driver_data;
839 struct ide_atapi_pc *pc = NULL;
840 struct request *postponed_rq = tape->postponed_rq;
843 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
844 " current_nr_sectors: %u\n",
845 (unsigned long long)rq->sector, rq->nr_sectors,
846 rq->current_nr_sectors);
848 if (!blk_special_request(rq)) {
849 /* We do not support buffer cache originated requests. */
850 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
851 "request queue (%d)\n", drive->name, rq->cmd_type);
852 ide_end_request(drive, 0, 0);
856 /* Retry a failed packet command */
857 if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
858 pc = tape->failed_pc;
862 if (postponed_rq != NULL)
863 if (rq != postponed_rq) {
864 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
865 "Two DSC requests were queued\n");
866 idetape_end_request(drive, 0, 0);
870 tape->postponed_rq = NULL;
873 * If the tape is still busy, postpone our request and service
874 * the other device meanwhile.
876 stat = hwif->tp_ops->read_status(hwif);
878 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
879 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
881 if (drive->post_reset == 1) {
882 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
883 drive->post_reset = 0;
886 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
887 (stat & ATA_DSC) == 0) {
888 if (postponed_rq == NULL) {
889 tape->dsc_polling_start = jiffies;
890 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
891 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
892 } else if (time_after(jiffies, tape->dsc_timeout)) {
893 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
895 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
896 idetape_media_access_finished(drive);
899 return ide_do_reset(drive);
901 } else if (time_after(jiffies,
902 tape->dsc_polling_start +
903 IDETAPE_DSC_MA_THRESHOLD))
904 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
905 idetape_postpone_request(drive);
908 if (rq->cmd[13] & REQ_IDETAPE_READ) {
909 pc = &tape->queued_pc;
910 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
913 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
914 pc = &tape->queued_pc;
915 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
918 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
919 pc = (struct ide_atapi_pc *) rq->buffer;
920 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
921 rq->cmd[13] |= REQ_IDETAPE_PC2;
924 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
925 idetape_media_access_finished(drive);
931 return idetape_issue_pc(drive, pc);
935 * The function below uses __get_free_pages to allocate a data buffer of size
936 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
939 * It returns a pointer to the newly allocated buffer, or NULL in case of
942 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
945 struct idetape_bh *prev_bh, *bh, *merge_bh;
946 int pages = tape->pages_per_buffer;
947 unsigned int order, b_allocd;
950 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
955 order = fls(pages) - 1;
956 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
959 b_allocd = (1 << order) * PAGE_SIZE;
963 memset(bh->b_data, 0, b_allocd);
964 bh->b_reqnext = NULL;
965 bh->b_size = b_allocd;
966 atomic_set(&bh->b_count, full ? bh->b_size : 0);
969 order = fls(pages) - 1;
970 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
973 b_allocd = (1 << order) * PAGE_SIZE;
976 memset(b_data, 0, b_allocd);
978 /* newly allocated page frames below buffer header or ...*/
979 if (bh->b_data == b_data + b_allocd) {
980 bh->b_size += b_allocd;
981 bh->b_data -= b_allocd;
983 atomic_add(b_allocd, &bh->b_count);
986 /* they are above the header */
987 if (b_data == bh->b_data + bh->b_size) {
988 bh->b_size += b_allocd;
990 atomic_add(b_allocd, &bh->b_count);
994 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
996 free_pages((unsigned long) b_data, order);
999 bh->b_reqnext = NULL;
1000 bh->b_data = b_data;
1001 bh->b_size = b_allocd;
1002 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1003 prev_bh->b_reqnext = bh;
1008 bh->b_size -= tape->excess_bh_size;
1010 atomic_sub(tape->excess_bh_size, &bh->b_count);
1013 ide_tape_kfree_buffer(tape);
1017 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1018 const char __user *buf, int n)
1020 struct idetape_bh *bh = tape->bh;
1026 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1030 count = min((unsigned int)
1031 (bh->b_size - atomic_read(&bh->b_count)),
1033 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1037 atomic_add(count, &bh->b_count);
1039 if (atomic_read(&bh->b_count) == bh->b_size) {
1042 atomic_set(&bh->b_count, 0);
1049 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1052 struct idetape_bh *bh = tape->bh;
1058 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1062 count = min(tape->b_count, n);
1063 if (copy_to_user(buf, tape->b_data, count))
1066 tape->b_data += count;
1067 tape->b_count -= count;
1069 if (!tape->b_count) {
1073 tape->b_data = bh->b_data;
1074 tape->b_count = atomic_read(&bh->b_count);
1081 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1083 struct idetape_bh *bh = tape->merge_bh;
1084 tape->bh = tape->merge_bh;
1086 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1087 atomic_set(&bh->b_count, 0);
1089 tape->b_data = bh->b_data;
1090 tape->b_count = atomic_read(&bh->b_count);
1095 * Write a filemark if write_filemark=1. Flush the device buffers without
1096 * writing a filemark otherwise.
1098 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1099 struct ide_atapi_pc *pc, int write_filemark)
1102 pc->c[0] = WRITE_FILEMARKS;
1103 pc->c[4] = write_filemark;
1104 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1107 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1109 idetape_tape_t *tape = drive->driver_data;
1110 struct gendisk *disk = tape->disk;
1111 int load_attempted = 0;
1113 /* Wait for the tape to become ready */
1114 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1116 while (time_before(jiffies, timeout)) {
1117 if (ide_do_test_unit_ready(drive, disk) == 0)
1119 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1120 || (tape->asc == 0x3A)) {
1124 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1126 /* not about to be ready */
1127 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1128 (tape->ascq == 1 || tape->ascq == 8)))
1135 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1137 struct ide_tape_obj *tape = drive->driver_data;
1138 struct ide_atapi_pc pc;
1141 idetape_create_write_filemark_cmd(drive, &pc, 0);
1142 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1145 idetape_wait_ready(drive, 60 * 5 * HZ);
1149 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1152 pc->c[0] = READ_POSITION;
1156 static int idetape_read_position(ide_drive_t *drive)
1158 idetape_tape_t *tape = drive->driver_data;
1159 struct ide_atapi_pc pc;
1162 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1164 idetape_create_read_position_cmd(&pc);
1165 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1167 position = tape->first_frame;
1171 static void idetape_create_locate_cmd(ide_drive_t *drive,
1172 struct ide_atapi_pc *pc,
1173 unsigned int block, u8 partition, int skip)
1176 pc->c[0] = POSITION_TO_ELEMENT;
1178 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1179 pc->c[8] = partition;
1180 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1183 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1185 idetape_tape_t *tape = drive->driver_data;
1187 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1190 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1191 tape->merge_bh_size = 0;
1192 if (tape->merge_bh != NULL) {
1193 ide_tape_kfree_buffer(tape);
1194 tape->merge_bh = NULL;
1197 tape->chrdev_dir = IDETAPE_DIR_NONE;
1201 * Position the tape to the requested block using the LOCATE packet command.
1202 * A READ POSITION command is then issued to check where we are positioned. Like
1203 * all higher level operations, we queue the commands at the tail of the request
1204 * queue and wait for their completion.
1206 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1207 u8 partition, int skip)
1209 idetape_tape_t *tape = drive->driver_data;
1210 struct gendisk *disk = tape->disk;
1212 struct ide_atapi_pc pc;
1214 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1215 __ide_tape_discard_merge_buffer(drive);
1216 idetape_wait_ready(drive, 60 * 5 * HZ);
1217 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1218 retval = ide_queue_pc_tail(drive, disk, &pc);
1222 idetape_create_read_position_cmd(&pc);
1223 return ide_queue_pc_tail(drive, disk, &pc);
1226 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1227 int restore_position)
1229 idetape_tape_t *tape = drive->driver_data;
1232 __ide_tape_discard_merge_buffer(drive);
1233 if (restore_position) {
1234 position = idetape_read_position(drive);
1235 seek = position > 0 ? position : 0;
1236 if (idetape_position_tape(drive, seek, 0, 0)) {
1237 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1238 " %s\n", tape->name, __func__);
1245 * Generate a read/write request for the block device interface and wait for it
1248 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1249 struct idetape_bh *bh)
1251 idetape_tape_t *tape = drive->driver_data;
1255 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1257 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1258 rq->cmd_type = REQ_TYPE_SPECIAL;
1260 rq->rq_disk = tape->disk;
1261 rq->special = (void *)bh;
1262 rq->sector = tape->first_frame;
1263 rq->nr_sectors = blocks;
1264 rq->current_nr_sectors = blocks;
1265 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1267 errors = rq->errors;
1268 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1269 blk_put_request(rq);
1271 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1275 idetape_init_merge_buffer(tape);
1276 if (errors == IDETAPE_ERROR_GENERAL)
1281 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1289 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1290 struct ide_atapi_pc *pc)
1293 pc->c[0] = REZERO_UNIT;
1294 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1297 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1302 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1305 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1309 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1311 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1314 /* Queue up a character device originated write request. */
1315 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1317 idetape_tape_t *tape = drive->driver_data;
1319 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1321 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1322 blocks, tape->merge_bh);
1325 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1327 idetape_tape_t *tape = drive->driver_data;
1329 struct idetape_bh *bh;
1331 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1332 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1333 " but we are not writing.\n");
1336 if (tape->merge_bh_size > tape->buffer_size) {
1337 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1338 tape->merge_bh_size = tape->buffer_size;
1340 if (tape->merge_bh_size) {
1341 blocks = tape->merge_bh_size / tape->blk_size;
1342 if (tape->merge_bh_size % tape->blk_size) {
1346 i = tape->blk_size - tape->merge_bh_size %
1348 bh = tape->bh->b_reqnext;
1350 atomic_set(&bh->b_count, 0);
1356 printk(KERN_INFO "ide-tape: bug,"
1360 min = min(i, (unsigned int)(bh->b_size -
1361 atomic_read(&bh->b_count)));
1362 memset(bh->b_data + atomic_read(&bh->b_count),
1364 atomic_add(min, &bh->b_count);
1369 (void) idetape_add_chrdev_write_request(drive, blocks);
1370 tape->merge_bh_size = 0;
1372 if (tape->merge_bh != NULL) {
1373 ide_tape_kfree_buffer(tape);
1374 tape->merge_bh = NULL;
1376 tape->chrdev_dir = IDETAPE_DIR_NONE;
1379 static int idetape_init_read(ide_drive_t *drive)
1381 idetape_tape_t *tape = drive->driver_data;
1384 /* Initialize read operation */
1385 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1386 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1387 ide_tape_flush_merge_buffer(drive);
1388 idetape_flush_tape_buffers(drive);
1390 if (tape->merge_bh || tape->merge_bh_size) {
1391 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1393 tape->merge_bh_size = 0;
1395 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1396 if (!tape->merge_bh)
1398 tape->chrdev_dir = IDETAPE_DIR_READ;
1401 * Issue a read 0 command to ensure that DSC handshake is
1402 * switched from completion mode to buffer available mode.
1403 * No point in issuing this if DSC overlap isn't supported, some
1404 * drives (Seagate STT3401A) will return an error.
1406 if (drive->dsc_overlap) {
1407 bytes_read = idetape_queue_rw_tail(drive,
1408 REQ_IDETAPE_READ, 0,
1410 if (bytes_read < 0) {
1411 ide_tape_kfree_buffer(tape);
1412 tape->merge_bh = NULL;
1413 tape->chrdev_dir = IDETAPE_DIR_NONE;
1422 /* called from idetape_chrdev_read() to service a chrdev read request. */
1423 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1425 idetape_tape_t *tape = drive->driver_data;
1427 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1429 /* If we are at a filemark, return a read length of 0 */
1430 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1433 idetape_init_read(drive);
1435 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1439 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1441 idetape_tape_t *tape = drive->driver_data;
1442 struct idetape_bh *bh;
1448 bh = tape->merge_bh;
1449 count = min(tape->buffer_size, bcount);
1451 blocks = count / tape->blk_size;
1453 atomic_set(&bh->b_count,
1454 min(count, (unsigned int)bh->b_size));
1455 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1456 count -= atomic_read(&bh->b_count);
1459 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1465 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1466 * currently support only one partition.
1468 static int idetape_rewind_tape(ide_drive_t *drive)
1470 struct ide_tape_obj *tape = drive->driver_data;
1471 struct gendisk *disk = tape->disk;
1473 struct ide_atapi_pc pc;
1475 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1477 idetape_create_rewind_cmd(drive, &pc);
1478 retval = ide_queue_pc_tail(drive, disk, &pc);
1482 idetape_create_read_position_cmd(&pc);
1483 retval = ide_queue_pc_tail(drive, disk, &pc);
1489 /* mtio.h compatible commands should be issued to the chrdev interface. */
1490 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1493 idetape_tape_t *tape = drive->driver_data;
1494 void __user *argp = (void __user *)arg;
1496 struct idetape_config {
1497 int dsc_rw_frequency;
1498 int dsc_media_access_frequency;
1502 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1506 if (copy_from_user(&config, argp, sizeof(config)))
1508 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1511 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1512 config.nr_stages = 1;
1513 if (copy_to_user(argp, &config, sizeof(config)))
1522 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1525 idetape_tape_t *tape = drive->driver_data;
1526 struct gendisk *disk = tape->disk;
1527 struct ide_atapi_pc pc;
1528 int retval, count = 0;
1529 int sprev = !!(tape->caps[4] & 0x20);
1533 if (MTBSF == mt_op || MTBSFM == mt_op) {
1536 mt_count = -mt_count;
1539 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1540 tape->merge_bh_size = 0;
1541 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1543 ide_tape_discard_merge_buffer(drive, 0);
1549 idetape_create_space_cmd(&pc, mt_count - count,
1550 IDETAPE_SPACE_OVER_FILEMARK);
1551 return ide_queue_pc_tail(drive, disk, &pc);
1556 retval = idetape_space_over_filemarks(drive, MTFSF,
1560 count = (MTBSFM == mt_op ? 1 : -1);
1561 return idetape_space_over_filemarks(drive, MTFSF, count);
1563 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1570 * Our character device read / write functions.
1572 * The tape is optimized to maximize throughput when it is transferring an
1573 * integral number of the "continuous transfer limit", which is a parameter of
1574 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1576 * As of version 1.3 of the driver, the character device provides an abstract
1577 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1578 * same backup/restore procedure is supported. The driver will internally
1579 * convert the requests to the recommended transfer unit, so that an unmatch
1580 * between the user's block size to the recommended size will only result in a
1581 * (slightly) increased driver overhead, but will no longer hit performance.
1582 * This is not applicable to Onstream.
1584 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1585 size_t count, loff_t *ppos)
1587 struct ide_tape_obj *tape = ide_tape_f(file);
1588 ide_drive_t *drive = tape->drive;
1589 ssize_t bytes_read, temp, actually_read = 0, rc;
1591 u16 ctl = *(u16 *)&tape->caps[12];
1593 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1595 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1596 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1597 if (count > tape->blk_size &&
1598 (count % tape->blk_size) == 0)
1599 tape->user_bs_factor = count / tape->blk_size;
1601 rc = idetape_init_read(drive);
1606 if (tape->merge_bh_size) {
1607 actually_read = min((unsigned int)(tape->merge_bh_size),
1608 (unsigned int)count);
1609 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1611 buf += actually_read;
1612 tape->merge_bh_size -= actually_read;
1613 count -= actually_read;
1615 while (count >= tape->buffer_size) {
1616 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1617 if (bytes_read <= 0)
1619 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1622 count -= bytes_read;
1623 actually_read += bytes_read;
1626 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1627 if (bytes_read <= 0)
1629 temp = min((unsigned long)count, (unsigned long)bytes_read);
1630 if (idetape_copy_stage_to_user(tape, buf, temp))
1632 actually_read += temp;
1633 tape->merge_bh_size = bytes_read-temp;
1636 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1637 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1639 idetape_space_over_filemarks(drive, MTFSF, 1);
1643 return ret ? ret : actually_read;
1646 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1647 size_t count, loff_t *ppos)
1649 struct ide_tape_obj *tape = ide_tape_f(file);
1650 ide_drive_t *drive = tape->drive;
1651 ssize_t actually_written = 0;
1653 u16 ctl = *(u16 *)&tape->caps[12];
1655 /* The drive is write protected. */
1656 if (tape->write_prot)
1659 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1661 /* Initialize write operation */
1662 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1663 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1664 ide_tape_discard_merge_buffer(drive, 1);
1665 if (tape->merge_bh || tape->merge_bh_size) {
1666 printk(KERN_ERR "ide-tape: merge_bh_size "
1667 "should be 0 now\n");
1668 tape->merge_bh_size = 0;
1670 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1671 if (!tape->merge_bh)
1673 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1674 idetape_init_merge_buffer(tape);
1677 * Issue a write 0 command to ensure that DSC handshake is
1678 * switched from completion mode to buffer available mode. No
1679 * point in issuing this if DSC overlap isn't supported, some
1680 * drives (Seagate STT3401A) will return an error.
1682 if (drive->dsc_overlap) {
1683 ssize_t retval = idetape_queue_rw_tail(drive,
1684 REQ_IDETAPE_WRITE, 0,
1687 ide_tape_kfree_buffer(tape);
1688 tape->merge_bh = NULL;
1689 tape->chrdev_dir = IDETAPE_DIR_NONE;
1696 if (tape->merge_bh_size) {
1697 if (tape->merge_bh_size >= tape->buffer_size) {
1698 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1699 tape->merge_bh_size = 0;
1701 actually_written = min((unsigned int)
1702 (tape->buffer_size - tape->merge_bh_size),
1703 (unsigned int)count);
1704 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1706 buf += actually_written;
1707 tape->merge_bh_size += actually_written;
1708 count -= actually_written;
1710 if (tape->merge_bh_size == tape->buffer_size) {
1712 tape->merge_bh_size = 0;
1713 retval = idetape_add_chrdev_write_request(drive, ctl);
1718 while (count >= tape->buffer_size) {
1720 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1722 buf += tape->buffer_size;
1723 count -= tape->buffer_size;
1724 retval = idetape_add_chrdev_write_request(drive, ctl);
1725 actually_written += tape->buffer_size;
1730 actually_written += count;
1731 if (idetape_copy_stage_from_user(tape, buf, count))
1733 tape->merge_bh_size += count;
1735 return ret ? ret : actually_written;
1738 static int idetape_write_filemark(ide_drive_t *drive)
1740 struct ide_tape_obj *tape = drive->driver_data;
1741 struct ide_atapi_pc pc;
1743 /* Write a filemark */
1744 idetape_create_write_filemark_cmd(drive, &pc, 1);
1745 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1746 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1753 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1756 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1757 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1758 * usually not supported.
1760 * The following commands are currently not supported:
1762 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1763 * MT_ST_WRITE_THRESHOLD.
1765 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1767 idetape_tape_t *tape = drive->driver_data;
1768 struct gendisk *disk = tape->disk;
1769 struct ide_atapi_pc pc;
1772 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1782 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1789 if (tape->write_prot)
1791 ide_tape_discard_merge_buffer(drive, 1);
1792 for (i = 0; i < mt_count; i++) {
1793 retval = idetape_write_filemark(drive);
1799 ide_tape_discard_merge_buffer(drive, 0);
1800 if (idetape_rewind_tape(drive))
1804 ide_tape_discard_merge_buffer(drive, 0);
1805 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1809 * If door is locked, attempt to unlock before
1810 * attempting to eject.
1812 if (tape->door_locked) {
1813 if (!ide_set_media_lock(drive, disk, 0))
1814 tape->door_locked = DOOR_UNLOCKED;
1816 ide_tape_discard_merge_buffer(drive, 0);
1817 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1819 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1822 ide_tape_discard_merge_buffer(drive, 0);
1823 return idetape_flush_tape_buffers(drive);
1825 ide_tape_discard_merge_buffer(drive, 0);
1826 return ide_do_start_stop(drive, disk,
1827 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1829 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1830 return ide_queue_pc_tail(drive, disk, &pc);
1832 (void)idetape_rewind_tape(drive);
1833 idetape_create_erase_cmd(&pc);
1834 return ide_queue_pc_tail(drive, disk, &pc);
1837 if (mt_count < tape->blk_size ||
1838 mt_count % tape->blk_size)
1840 tape->user_bs_factor = mt_count / tape->blk_size;
1841 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1843 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1846 ide_tape_discard_merge_buffer(drive, 0);
1847 return idetape_position_tape(drive,
1848 mt_count * tape->user_bs_factor, tape->partition, 0);
1850 ide_tape_discard_merge_buffer(drive, 0);
1851 return idetape_position_tape(drive, 0, mt_count, 0);
1855 retval = ide_set_media_lock(drive, disk, 1);
1858 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1861 retval = ide_set_media_lock(drive, disk, 0);
1864 tape->door_locked = DOOR_UNLOCKED;
1867 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1874 * Our character device ioctls. General mtio.h magnetic io commands are
1875 * supported here, and not in the corresponding block interface. Our own
1876 * ide-tape ioctls are supported on both interfaces.
1878 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1879 unsigned int cmd, unsigned long arg)
1881 struct ide_tape_obj *tape = ide_tape_f(file);
1882 ide_drive_t *drive = tape->drive;
1886 int block_offset = 0, position = tape->first_frame;
1887 void __user *argp = (void __user *)arg;
1889 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1891 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1892 ide_tape_flush_merge_buffer(drive);
1893 idetape_flush_tape_buffers(drive);
1895 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1896 block_offset = tape->merge_bh_size /
1897 (tape->blk_size * tape->user_bs_factor);
1898 position = idetape_read_position(drive);
1904 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1906 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1908 memset(&mtget, 0, sizeof(struct mtget));
1909 mtget.mt_type = MT_ISSCSI2;
1910 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1912 ((tape->blk_size * tape->user_bs_factor)
1913 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1915 if (tape->drv_write_prot)
1916 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1918 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1922 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1923 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1927 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1928 ide_tape_discard_merge_buffer(drive, 1);
1929 return idetape_blkdev_ioctl(drive, cmd, arg);
1934 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1935 * block size with the reported value.
1937 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1939 idetape_tape_t *tape = drive->driver_data;
1940 struct ide_atapi_pc pc;
1942 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1943 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1944 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1945 if (tape->blk_size == 0) {
1946 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1947 "block size, assuming 32k\n");
1948 tape->blk_size = 32768;
1952 tape->blk_size = (pc.buf[4 + 5] << 16) +
1953 (pc.buf[4 + 6] << 8) +
1955 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1958 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1960 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1962 idetape_tape_t *tape;
1965 if (i >= MAX_HWIFS * MAX_DRIVES)
1969 tape = ide_tape_chrdev_get(i);
1975 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1978 * We really want to do nonseekable_open(inode, filp); here, but some
1979 * versions of tar incorrectly call lseek on tapes and bail out if that
1980 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1982 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1984 drive = tape->drive;
1986 filp->private_data = tape;
1988 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1993 retval = idetape_wait_ready(drive, 60 * HZ);
1995 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1996 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2000 idetape_read_position(drive);
2001 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2002 (void)idetape_rewind_tape(drive);
2004 /* Read block size and write protect status from drive. */
2005 ide_tape_get_bsize_from_bdesc(drive);
2007 /* Set write protect flag if device is opened as read-only. */
2008 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2009 tape->write_prot = 1;
2011 tape->write_prot = tape->drv_write_prot;
2013 /* Make sure drive isn't write protected if user wants to write. */
2014 if (tape->write_prot) {
2015 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2016 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2017 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2023 /* Lock the tape drive door so user can't eject. */
2024 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2025 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2026 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2027 tape->door_locked = DOOR_LOCKED;
2039 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2041 idetape_tape_t *tape = drive->driver_data;
2043 ide_tape_flush_merge_buffer(drive);
2044 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2045 if (tape->merge_bh != NULL) {
2046 idetape_pad_zeros(drive, tape->blk_size *
2047 (tape->user_bs_factor - 1));
2048 ide_tape_kfree_buffer(tape);
2049 tape->merge_bh = NULL;
2051 idetape_write_filemark(drive);
2052 idetape_flush_tape_buffers(drive);
2053 idetape_flush_tape_buffers(drive);
2056 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2058 struct ide_tape_obj *tape = ide_tape_f(filp);
2059 ide_drive_t *drive = tape->drive;
2060 unsigned int minor = iminor(inode);
2063 tape = drive->driver_data;
2065 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2067 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2068 idetape_write_release(drive, minor);
2069 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2071 ide_tape_discard_merge_buffer(drive, 1);
2074 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2075 (void) idetape_rewind_tape(drive);
2076 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2077 if (tape->door_locked == DOOR_LOCKED) {
2078 if (!ide_set_media_lock(drive, tape->disk, 0))
2079 tape->door_locked = DOOR_UNLOCKED;
2082 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2088 static void idetape_get_inquiry_results(ide_drive_t *drive)
2090 idetape_tape_t *tape = drive->driver_data;
2091 struct ide_atapi_pc pc;
2092 char fw_rev[4], vendor_id[8], product_id[16];
2094 idetape_create_inquiry_cmd(&pc);
2095 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2096 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2100 memcpy(vendor_id, &pc.buf[8], 8);
2101 memcpy(product_id, &pc.buf[16], 16);
2102 memcpy(fw_rev, &pc.buf[32], 4);
2104 ide_fixstring(vendor_id, 8, 0);
2105 ide_fixstring(product_id, 16, 0);
2106 ide_fixstring(fw_rev, 4, 0);
2108 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2109 drive->name, tape->name, vendor_id, product_id, fw_rev);
2113 * Ask the tape about its various parameters. In particular, we will adjust our
2114 * data transfer buffer size to the recommended value as returned by the tape.
2116 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2118 idetape_tape_t *tape = drive->driver_data;
2119 struct ide_atapi_pc pc;
2121 u8 speed, max_speed;
2123 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2124 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2125 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2126 " some default values\n");
2127 tape->blk_size = 512;
2128 put_unaligned(52, (u16 *)&tape->caps[12]);
2129 put_unaligned(540, (u16 *)&tape->caps[14]);
2130 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2133 caps = pc.buf + 4 + pc.buf[3];
2135 /* convert to host order and save for later use */
2136 speed = be16_to_cpup((__be16 *)&caps[14]);
2137 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2139 *(u16 *)&caps[8] = max_speed;
2140 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2141 *(u16 *)&caps[14] = speed;
2142 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2145 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2146 "(assuming 650KB/sec)\n", drive->name);
2147 *(u16 *)&caps[14] = 650;
2150 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2151 "(assuming 650KB/sec)\n", drive->name);
2152 *(u16 *)&caps[8] = 650;
2155 memcpy(&tape->caps, caps, 20);
2157 /* device lacks locking support according to capabilities page */
2158 if ((caps[6] & 1) == 0)
2159 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2162 tape->blk_size = 512;
2163 else if (caps[7] & 0x04)
2164 tape->blk_size = 1024;
2167 #ifdef CONFIG_IDE_PROC_FS
2168 #define ide_tape_devset_get(name, field) \
2169 static int get_##name(ide_drive_t *drive) \
2171 idetape_tape_t *tape = drive->driver_data; \
2172 return tape->field; \
2175 #define ide_tape_devset_set(name, field) \
2176 static int set_##name(ide_drive_t *drive, int arg) \
2178 idetape_tape_t *tape = drive->driver_data; \
2179 tape->field = arg; \
2183 #define ide_tape_devset_rw_field(_name, _field) \
2184 ide_tape_devset_get(_name, _field) \
2185 ide_tape_devset_set(_name, _field) \
2186 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2188 #define ide_tape_devset_r_field(_name, _field) \
2189 ide_tape_devset_get(_name, _field) \
2190 IDE_DEVSET(_name, 0, get_##_name, NULL)
2192 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2193 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2194 static int divf_buffer(ide_drive_t *drive) { return 2; }
2195 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2197 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2199 ide_tape_devset_rw_field(debug_mask, debug_mask);
2200 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2202 ide_tape_devset_r_field(avg_speed, avg_speed);
2203 ide_tape_devset_r_field(speed, caps[14]);
2204 ide_tape_devset_r_field(buffer, caps[16]);
2205 ide_tape_devset_r_field(buffer_size, buffer_size);
2207 static const struct ide_proc_devset idetape_settings[] = {
2208 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2209 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2210 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2211 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2212 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2213 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2214 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2215 mulf_tdsc, divf_tdsc),
2221 * The function below is called to:
2223 * 1. Initialize our various state variables.
2224 * 2. Ask the tape for its capabilities.
2225 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2226 * is chosen based on the recommendation which we received in step 2.
2228 * Note that at this point ide.c already assigned us an irq, so that we can
2229 * queue requests here and wait for their completion.
2231 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2237 u16 *ctl = (u16 *)&tape->caps[12];
2239 drive->pc_callback = ide_tape_callback;
2241 spin_lock_init(&tape->lock);
2242 drive->dsc_overlap = 1;
2243 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2244 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2246 drive->dsc_overlap = 0;
2248 /* Seagate Travan drives do not support DSC overlap. */
2249 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2250 drive->dsc_overlap = 0;
2251 tape->minor = minor;
2252 tape->name[0] = 'h';
2253 tape->name[1] = 't';
2254 tape->name[2] = '0' + minor;
2255 tape->chrdev_dir = IDETAPE_DIR_NONE;
2257 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2259 /* Command packet DRQ type */
2260 if (((gcw[0] & 0x60) >> 5) == 1)
2261 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2263 idetape_get_inquiry_results(drive);
2264 idetape_get_mode_sense_results(drive);
2265 ide_tape_get_bsize_from_bdesc(drive);
2266 tape->user_bs_factor = 1;
2267 tape->buffer_size = *ctl * tape->blk_size;
2268 while (tape->buffer_size > 0xffff) {
2269 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2271 tape->buffer_size = *ctl * tape->blk_size;
2273 buffer_size = tape->buffer_size;
2274 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2275 if (buffer_size % PAGE_SIZE) {
2276 tape->pages_per_buffer++;
2277 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2280 /* select the "best" DSC read/write polling freq */
2281 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2283 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2286 * Ensure that the number we got makes sense; limit it within
2287 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2289 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2290 IDETAPE_DSC_RW_MAX);
2291 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2293 drive->name, tape->name, *(u16 *)&tape->caps[14],
2294 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2295 tape->buffer_size / 1024,
2296 tape->best_dsc_rw_freq * 1000 / HZ,
2297 drive->using_dma ? ", DMA":"");
2299 ide_proc_register_driver(drive, tape->driver);
2302 static void ide_tape_remove(ide_drive_t *drive)
2304 idetape_tape_t *tape = drive->driver_data;
2306 ide_proc_unregister_driver(drive, tape->driver);
2308 ide_unregister_region(tape->disk);
2313 static void ide_tape_release(struct kref *kref)
2315 struct ide_tape_obj *tape = to_ide_tape(kref);
2316 ide_drive_t *drive = tape->drive;
2317 struct gendisk *g = tape->disk;
2319 BUG_ON(tape->merge_bh_size);
2321 drive->dsc_overlap = 0;
2322 drive->driver_data = NULL;
2323 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2324 device_destroy(idetape_sysfs_class,
2325 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2326 idetape_devs[tape->minor] = NULL;
2327 g->private_data = NULL;
2332 #ifdef CONFIG_IDE_PROC_FS
2333 static int proc_idetape_read_name
2334 (char *page, char **start, off_t off, int count, int *eof, void *data)
2336 ide_drive_t *drive = (ide_drive_t *) data;
2337 idetape_tape_t *tape = drive->driver_data;
2341 len = sprintf(out, "%s\n", tape->name);
2342 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2345 static ide_proc_entry_t idetape_proc[] = {
2346 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2347 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2348 { NULL, 0, NULL, NULL }
2352 static int ide_tape_probe(ide_drive_t *);
2354 static ide_driver_t idetape_driver = {
2356 .owner = THIS_MODULE,
2358 .bus = &ide_bus_type,
2360 .probe = ide_tape_probe,
2361 .remove = ide_tape_remove,
2362 .version = IDETAPE_VERSION,
2364 .do_request = idetape_do_request,
2365 .end_request = idetape_end_request,
2366 .error = __ide_error,
2367 #ifdef CONFIG_IDE_PROC_FS
2368 .proc = idetape_proc,
2369 .settings = idetape_settings,
2373 /* Our character device supporting functions, passed to register_chrdev. */
2374 static const struct file_operations idetape_fops = {
2375 .owner = THIS_MODULE,
2376 .read = idetape_chrdev_read,
2377 .write = idetape_chrdev_write,
2378 .ioctl = idetape_chrdev_ioctl,
2379 .open = idetape_chrdev_open,
2380 .release = idetape_chrdev_release,
2383 static int idetape_open(struct inode *inode, struct file *filp)
2385 struct gendisk *disk = inode->i_bdev->bd_disk;
2386 struct ide_tape_obj *tape;
2388 tape = ide_tape_get(disk);
2395 static int idetape_release(struct inode *inode, struct file *filp)
2397 struct gendisk *disk = inode->i_bdev->bd_disk;
2398 struct ide_tape_obj *tape = ide_tape_g(disk);
2405 static int idetape_ioctl(struct inode *inode, struct file *file,
2406 unsigned int cmd, unsigned long arg)
2408 struct block_device *bdev = inode->i_bdev;
2409 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2410 ide_drive_t *drive = tape->drive;
2411 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2413 err = idetape_blkdev_ioctl(drive, cmd, arg);
2417 static struct block_device_operations idetape_block_ops = {
2418 .owner = THIS_MODULE,
2419 .open = idetape_open,
2420 .release = idetape_release,
2421 .ioctl = idetape_ioctl,
2424 static int ide_tape_probe(ide_drive_t *drive)
2426 idetape_tape_t *tape;
2430 if (!strstr("ide-tape", drive->driver_req))
2433 if (drive->media != ide_tape)
2436 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2437 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2438 " the driver\n", drive->name);
2441 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2443 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2448 g = alloc_disk(1 << PARTN_BITS);
2452 ide_init_disk(g, drive);
2454 kref_init(&tape->kref);
2456 tape->drive = drive;
2457 tape->driver = &idetape_driver;
2460 g->private_data = &tape->driver;
2462 drive->driver_data = tape;
2464 mutex_lock(&idetape_ref_mutex);
2465 for (minor = 0; idetape_devs[minor]; minor++)
2467 idetape_devs[minor] = tape;
2468 mutex_unlock(&idetape_ref_mutex);
2470 idetape_setup(drive, tape, minor);
2472 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2473 MKDEV(IDETAPE_MAJOR, minor), NULL,
2475 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2476 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2479 g->fops = &idetape_block_ops;
2480 ide_register_region(g);
2490 static void __exit idetape_exit(void)
2492 driver_unregister(&idetape_driver.gen_driver);
2493 class_destroy(idetape_sysfs_class);
2494 unregister_chrdev(IDETAPE_MAJOR, "ht");
2497 static int __init idetape_init(void)
2500 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2501 if (IS_ERR(idetape_sysfs_class)) {
2502 idetape_sysfs_class = NULL;
2503 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2508 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2509 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2512 goto out_free_class;
2515 error = driver_register(&idetape_driver.gen_driver);
2517 goto out_free_driver;
2522 driver_unregister(&idetape_driver.gen_driver);
2524 class_destroy(idetape_sysfs_class);
2529 MODULE_ALIAS("ide:*m-tape*");
2530 module_init(idetape_init);
2531 module_exit(idetape_exit);
2532 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2533 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2534 MODULE_LICENSE("GPL");