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 * Some drives (for example, Seagate STT3401A Travan) require a very long
85 * timeout, because they don't return an interrupt or clear their busy bit
86 * until after the command completes (even retension commands).
88 #define IDETAPE_WAIT_CMD (900*HZ)
91 * The following parameter is used to select the point in the internal tape fifo
92 * in which we will start to refill the buffer. Decreasing the following
93 * parameter will improve the system's latency and interactive response, while
94 * using a high value might improve system throughput.
96 #define IDETAPE_FIFO_THRESHOLD 2
99 * DSC polling parameters.
101 * Polling for DSC (a single bit in the status register) is a very important
102 * function in ide-tape. There are two cases in which we poll for DSC:
104 * 1. Before a read/write packet command, to ensure that we can transfer data
105 * from/to the tape's data buffers, without causing an actual media access.
106 * In case the tape is not ready yet, we take out our request from the device
107 * request queue, so that ide.c could service requests from the other device
108 * on the same interface in the meantime.
110 * 2. After the successful initialization of a "media access packet command",
111 * which is a command that can take a long time to complete (the interval can
112 * range from several seconds to even an hour). Again, we postpone our request
113 * in the middle to free the bus for the other device. The polling frequency
114 * here should be lower than the read/write frequency since those media access
115 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
116 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
117 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
119 * We also set a timeout for the timer, in case something goes wrong. The
120 * timeout should be longer then the maximum execution time of a tape operation.
124 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
125 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
126 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
127 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
128 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
129 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
130 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
132 /*************************** End of tunable parameters ***********************/
134 /* tape directions */
136 IDETAPE_DIR_NONE = (1 << 0),
137 IDETAPE_DIR_READ = (1 << 1),
138 IDETAPE_DIR_WRITE = (1 << 2),
144 struct idetape_bh *b_reqnext;
148 /* Tape door status */
149 #define DOOR_UNLOCKED 0
150 #define DOOR_LOCKED 1
151 #define DOOR_EXPLICITLY_LOCKED 2
153 /* Some defines for the SPACE command */
154 #define IDETAPE_SPACE_OVER_FILEMARK 1
155 #define IDETAPE_SPACE_TO_EOD 3
157 /* Some defines for the LOAD UNLOAD command */
158 #define IDETAPE_LU_LOAD_MASK 1
159 #define IDETAPE_LU_RETENSION_MASK 2
160 #define IDETAPE_LU_EOT_MASK 4
162 /* Error codes returned in rq->errors to the higher part of the driver. */
163 #define IDETAPE_ERROR_GENERAL 101
164 #define IDETAPE_ERROR_FILEMARK 102
165 #define IDETAPE_ERROR_EOD 103
167 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
168 #define IDETAPE_BLOCK_DESCRIPTOR 0
169 #define IDETAPE_CAPABILITIES_PAGE 0x2a
172 * Most of our global data which we need to save even as we leave the driver due
173 * to an interrupt or a timer event is stored in the struct defined below.
175 typedef struct ide_tape_obj {
177 ide_driver_t *driver;
178 struct gendisk *disk;
182 * pc points to the current processed packet command.
184 * failed_pc points to the last failed packet command, or contains
185 * NULL if we do not need to retry any packet command. This is
186 * required since an additional packet command is needed before the
187 * retry, to get detailed information on what went wrong.
189 /* Current packet command */
190 struct ide_atapi_pc *pc;
191 /* Last failed packet command */
192 struct ide_atapi_pc *failed_pc;
193 /* used by REQ_IDETAPE_{READ,WRITE} requests */
194 struct ide_atapi_pc queued_pc;
196 struct ide_atapi_pc request_sense_pc;
197 struct request request_sense_rq;
200 * DSC polling variables.
202 * While polling for DSC we use postponed_rq to postpone the current
203 * request so that ide.c will be able to service pending requests on the
204 * other device. Note that at most we will have only one DSC (usually
205 * data transfer) request in the device request queue.
207 struct request *postponed_rq;
208 /* The time in which we started polling for DSC */
209 unsigned long dsc_polling_start;
210 /* Timer used to poll for dsc */
211 struct timer_list dsc_timer;
212 /* Read/Write dsc polling frequency */
213 unsigned long best_dsc_rw_freq;
214 unsigned long dsc_poll_freq;
215 unsigned long dsc_timeout;
217 /* Read position information */
220 unsigned int first_frame;
222 /* Last error information */
223 u8 sense_key, asc, ascq;
225 /* Character device operation */
229 /* Current character device data transfer direction */
232 /* tape block size, usually 512 or 1024 bytes */
233 unsigned short blk_size;
236 /* Copy of the tape's Capabilities and Mechanical Page */
240 * Active data transfer request parameters.
242 * At most, there is only one ide-tape originated data transfer request
243 * in the device request queue. This allows ide.c to easily service
244 * requests from the other device when we postpone our active request.
247 /* Data buffer size chosen based on the tape's recommendation */
250 struct idetape_bh *merge_bh;
251 /* size of the merge buffer */
253 /* pointer to current buffer head within the merge buffer */
254 struct idetape_bh *bh;
258 int pages_per_buffer;
259 /* Wasted space in each stage */
262 /* protects the ide-tape queue */
265 /* Measures average tape speed */
266 unsigned long avg_time;
270 /* the door is currently locked */
272 /* the tape hardware is write protected */
274 /* the tape is write protected (hardware or opened as read-only) */
280 static DEFINE_MUTEX(idetape_ref_mutex);
282 static struct class *idetape_sysfs_class;
284 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
286 #define ide_tape_g(disk) \
287 container_of((disk)->private_data, struct ide_tape_obj, driver)
289 static void ide_tape_release(struct kref *);
291 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
293 struct ide_tape_obj *tape = NULL;
295 mutex_lock(&idetape_ref_mutex);
296 tape = ide_tape_g(disk);
298 if (ide_device_get(tape->drive))
301 kref_get(&tape->kref);
303 mutex_unlock(&idetape_ref_mutex);
307 static void ide_tape_put(struct ide_tape_obj *tape)
309 ide_drive_t *drive = tape->drive;
311 mutex_lock(&idetape_ref_mutex);
312 kref_put(&tape->kref, ide_tape_release);
313 ide_device_put(drive);
314 mutex_unlock(&idetape_ref_mutex);
318 * The variables below are used for the character device interface. Additional
319 * state variables are defined in our ide_drive_t structure.
321 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
323 #define ide_tape_f(file) ((file)->private_data)
325 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
327 struct ide_tape_obj *tape = NULL;
329 mutex_lock(&idetape_ref_mutex);
330 tape = idetape_devs[i];
332 kref_get(&tape->kref);
333 mutex_unlock(&idetape_ref_mutex);
337 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
340 struct idetape_bh *bh = pc->bh;
345 printk(KERN_ERR "ide-tape: bh == NULL in "
346 "idetape_input_buffers\n");
347 ide_pad_transfer(drive, 0, bcount);
351 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
353 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
354 atomic_read(&bh->b_count), count);
356 atomic_add(count, &bh->b_count);
357 if (atomic_read(&bh->b_count) == bh->b_size) {
360 atomic_set(&bh->b_count, 0);
366 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
369 struct idetape_bh *bh = pc->bh;
374 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
378 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
379 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
382 pc->b_count -= count;
387 pc->b_data = bh->b_data;
388 pc->b_count = atomic_read(&bh->b_count);
394 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
396 struct idetape_bh *bh = pc->bh;
398 unsigned int bcount = pc->xferred;
400 if (pc->flags & PC_FLAG_WRITING)
404 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
408 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
409 atomic_set(&bh->b_count, count);
410 if (atomic_read(&bh->b_count) == bh->b_size)
418 * called on each failed packet command retry to analyze the request sense. We
419 * currently do not utilize this information.
421 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
423 idetape_tape_t *tape = drive->driver_data;
424 struct ide_atapi_pc *pc = tape->failed_pc;
426 tape->sense_key = sense[2] & 0xF;
427 tape->asc = sense[12];
428 tape->ascq = sense[13];
430 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
431 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
433 /* Correct pc->xferred by asking the tape. */
434 if (pc->flags & PC_FLAG_DMA_ERROR) {
435 pc->xferred = pc->req_xfer -
437 get_unaligned_be32(&sense[3]);
438 idetape_update_buffers(drive, pc);
442 * If error was the result of a zero-length read or write command,
443 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
444 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
446 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
448 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
449 if (tape->sense_key == 5) {
450 /* don't report an error, everything's ok */
452 /* don't retry read/write */
453 pc->flags |= PC_FLAG_ABORT;
456 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
457 pc->error = IDETAPE_ERROR_FILEMARK;
458 pc->flags |= PC_FLAG_ABORT;
460 if (pc->c[0] == WRITE_6) {
461 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
462 && tape->asc == 0x0 && tape->ascq == 0x2)) {
463 pc->error = IDETAPE_ERROR_EOD;
464 pc->flags |= PC_FLAG_ABORT;
467 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
468 if (tape->sense_key == 8) {
469 pc->error = IDETAPE_ERROR_EOD;
470 pc->flags |= PC_FLAG_ABORT;
472 if (!(pc->flags & PC_FLAG_ABORT) &&
474 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
478 /* Free data buffers completely. */
479 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
481 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
484 u32 size = bh->b_size;
487 unsigned int order = fls(size >> PAGE_SHIFT)-1;
490 free_pages((unsigned long)bh->b_data, order);
493 bh->b_data += (1 << order) * PAGE_SIZE;
501 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
503 struct request *rq = HWGROUP(drive)->rq;
504 idetape_tape_t *tape = drive->driver_data;
508 debug_log(DBG_PROCS, "Enter %s\n", __func__);
511 case 0: error = IDETAPE_ERROR_GENERAL; break;
512 case 1: error = 0; break;
513 default: error = uptodate;
517 tape->failed_pc = NULL;
519 if (!blk_special_request(rq)) {
520 ide_end_request(drive, uptodate, nr_sects);
524 spin_lock_irqsave(&tape->lock, flags);
526 ide_end_drive_cmd(drive, 0, 0);
528 spin_unlock_irqrestore(&tape->lock, flags);
532 static void ide_tape_callback(ide_drive_t *drive)
534 idetape_tape_t *tape = drive->driver_data;
535 struct ide_atapi_pc *pc = tape->pc;
536 int uptodate = pc->error ? 0 : 1;
538 debug_log(DBG_PROCS, "Enter %s\n", __func__);
540 if (tape->failed_pc == pc)
541 tape->failed_pc = NULL;
543 if (pc->c[0] == REQUEST_SENSE) {
545 idetape_analyze_error(drive, pc->buf);
547 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
548 "itself - Aborting request!\n");
549 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
550 struct request *rq = drive->hwif->hwgroup->rq;
551 int blocks = pc->xferred / tape->blk_size;
553 tape->avg_size += blocks * tape->blk_size;
555 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
556 tape->avg_speed = tape->avg_size * HZ /
557 (jiffies - tape->avg_time) / 1024;
559 tape->avg_time = jiffies;
562 tape->first_frame += blocks;
563 rq->current_nr_sectors -= blocks;
566 uptodate = pc->error;
567 } else if (pc->c[0] == READ_POSITION && uptodate) {
568 u8 *readpos = tape->pc->buf;
570 debug_log(DBG_SENSE, "BOP - %s\n",
571 (readpos[0] & 0x80) ? "Yes" : "No");
572 debug_log(DBG_SENSE, "EOP - %s\n",
573 (readpos[0] & 0x40) ? "Yes" : "No");
575 if (readpos[0] & 0x4) {
576 printk(KERN_INFO "ide-tape: Block location is unknown"
578 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
581 debug_log(DBG_SENSE, "Block Location - %u\n",
582 be32_to_cpup((__be32 *)&readpos[4]));
584 tape->partition = readpos[1];
585 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
586 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
590 idetape_end_request(drive, uptodate, 0);
593 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
596 pc->c[0] = REQUEST_SENSE;
602 * idetape_retry_pc is called when an error was detected during the
603 * last packet command. We queue a request sense packet command in
604 * the head of the request list.
606 static void idetape_retry_pc(ide_drive_t *drive)
608 struct ide_tape_obj *tape = drive->driver_data;
609 struct request *rq = &tape->request_sense_rq;
610 struct ide_atapi_pc *pc = &tape->request_sense_pc;
612 (void)ide_read_error(drive);
613 idetape_create_request_sense_cmd(pc);
614 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
615 ide_queue_pc_head(drive, tape->disk, pc, rq);
619 * Postpone the current request so that ide.c will be able to service requests
620 * from another device on the same hwgroup while we are polling for DSC.
622 static void idetape_postpone_request(ide_drive_t *drive)
624 idetape_tape_t *tape = drive->driver_data;
626 debug_log(DBG_PROCS, "Enter %s\n", __func__);
628 tape->postponed_rq = HWGROUP(drive)->rq;
629 ide_stall_queue(drive, tape->dsc_poll_freq);
632 static void ide_tape_handle_dsc(ide_drive_t *drive)
634 idetape_tape_t *tape = drive->driver_data;
636 /* Media access command */
637 tape->dsc_polling_start = jiffies;
638 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
639 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
640 /* Allow ide.c to handle other requests */
641 idetape_postpone_request(drive);
644 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
645 unsigned int bcount, int write)
648 idetape_output_buffers(drive, pc, bcount);
650 idetape_input_buffers(drive, pc, bcount);
656 * This is the usual interrupt handler which will be called during a packet
657 * command. We will transfer some of the data (as requested by the drive) and
658 * will re-point interrupt handler to us. When data transfer is finished, we
659 * will act according to the algorithm described before
662 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
664 idetape_tape_t *tape = drive->driver_data;
666 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD,
667 NULL, idetape_update_buffers, idetape_retry_pc,
668 ide_tape_handle_dsc, ide_tape_io_buffers);
672 * Packet Command Interface
674 * The current Packet Command is available in tape->pc, and will not change
675 * until we finish handling it. Each packet command is associated with a
676 * callback function that will be called when the command is finished.
678 * The handling will be done in three stages:
680 * 1. idetape_issue_pc will send the packet command to the drive, and will set
681 * the interrupt handler to idetape_pc_intr.
683 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
684 * repeated until the device signals us that no more interrupts will be issued.
686 * 3. ATAPI Tape media access commands have immediate status with a delayed
687 * process. In case of a successful initiation of a media access packet command,
688 * the DSC bit will be set when the actual execution of the command is finished.
689 * Since the tape drive will not issue an interrupt, we have to poll for this
690 * event. In this case, we define the request as "low priority request" by
691 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
694 * ide.c will then give higher priority to requests which originate from the
695 * other device, until will change rq_status to RQ_ACTIVE.
697 * 4. When the packet command is finished, it will be checked for errors.
699 * 5. In case an error was found, we queue a request sense packet command in
700 * front of the request queue and retry the operation up to
701 * IDETAPE_MAX_PC_RETRIES times.
703 * 6. In case no error was found, or we decided to give up and not to retry
704 * again, the callback function will be called and then we will handle the next
707 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
709 idetape_tape_t *tape = drive->driver_data;
711 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
712 IDETAPE_WAIT_CMD, NULL);
715 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
716 struct ide_atapi_pc *pc)
718 idetape_tape_t *tape = drive->driver_data;
720 if (tape->pc->c[0] == REQUEST_SENSE &&
721 pc->c[0] == REQUEST_SENSE) {
722 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
723 "Two request sense in serial were issued\n");
726 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
727 tape->failed_pc = pc;
728 /* Set the current packet command */
731 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
732 (pc->flags & PC_FLAG_ABORT)) {
734 * We will "abort" retrying a packet command in case legitimate
735 * error code was received (crossing a filemark, or end of the
736 * media, for example).
738 if (!(pc->flags & PC_FLAG_ABORT)) {
739 if (!(pc->c[0] == TEST_UNIT_READY &&
740 tape->sense_key == 2 && tape->asc == 4 &&
741 (tape->ascq == 1 || tape->ascq == 8))) {
742 printk(KERN_ERR "ide-tape: %s: I/O error, "
743 "pc = %2x, key = %2x, "
744 "asc = %2x, ascq = %2x\n",
745 tape->name, pc->c[0],
746 tape->sense_key, tape->asc,
750 pc->error = IDETAPE_ERROR_GENERAL;
752 tape->failed_pc = NULL;
753 drive->pc_callback(drive);
756 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
760 return ide_issue_pc(drive, pc, idetape_transfer_pc,
761 IDETAPE_WAIT_CMD, NULL);
764 /* A mode sense command is used to "sense" tape parameters. */
765 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
768 pc->c[0] = MODE_SENSE;
769 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
770 /* DBD = 1 - Don't return block descriptors */
772 pc->c[2] = page_code;
774 * Changed pc->c[3] to 0 (255 will at best return unused info).
776 * For SCSI this byte is defined as subpage instead of high byte
777 * of length and some IDE drives seem to interpret it this way
778 * and return an error when 255 is used.
781 /* We will just discard data in that case */
783 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
785 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
791 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
793 ide_hwif_t *hwif = drive->hwif;
794 idetape_tape_t *tape = drive->driver_data;
795 struct ide_atapi_pc *pc = tape->pc;
798 stat = hwif->tp_ops->read_status(hwif);
800 if (stat & ATA_DSC) {
801 if (stat & ATA_ERR) {
803 if (pc->c[0] != TEST_UNIT_READY)
804 printk(KERN_ERR "ide-tape: %s: I/O error, ",
806 /* Retry operation */
807 idetape_retry_pc(drive);
812 pc->error = IDETAPE_ERROR_GENERAL;
813 tape->failed_pc = NULL;
815 drive->pc_callback(drive);
819 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
820 struct ide_atapi_pc *pc, struct request *rq,
823 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
824 unsigned int length = rq->current_nr_sectors;
827 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
831 pc->buf_size = length * tape->blk_size;
832 pc->req_xfer = pc->buf_size;
833 if (pc->req_xfer == tape->buffer_size)
834 pc->flags |= PC_FLAG_DMA_OK;
836 if (opcode == READ_6) {
838 atomic_set(&bh->b_count, 0);
839 } else if (opcode == WRITE_6) {
841 pc->flags |= PC_FLAG_WRITING;
842 pc->b_data = bh->b_data;
843 pc->b_count = atomic_read(&bh->b_count);
846 memcpy(rq->cmd, pc->c, 12);
849 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
850 struct request *rq, sector_t block)
852 ide_hwif_t *hwif = drive->hwif;
853 idetape_tape_t *tape = drive->driver_data;
854 struct ide_atapi_pc *pc = NULL;
855 struct request *postponed_rq = tape->postponed_rq;
858 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
859 " current_nr_sectors: %u\n",
860 (unsigned long long)rq->sector, rq->nr_sectors,
861 rq->current_nr_sectors);
863 if (!blk_special_request(rq)) {
864 /* We do not support buffer cache originated requests. */
865 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
866 "request queue (%d)\n", drive->name, rq->cmd_type);
867 ide_end_request(drive, 0, 0);
871 /* Retry a failed packet command */
872 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
873 pc = tape->failed_pc;
877 if (postponed_rq != NULL)
878 if (rq != postponed_rq) {
879 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
880 "Two DSC requests were queued\n");
881 idetape_end_request(drive, 0, 0);
885 tape->postponed_rq = NULL;
888 * If the tape is still busy, postpone our request and service
889 * the other device meanwhile.
891 stat = hwif->tp_ops->read_status(hwif);
893 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
894 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
896 if (drive->post_reset == 1) {
897 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
898 drive->post_reset = 0;
901 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
902 (stat & ATA_DSC) == 0) {
903 if (postponed_rq == NULL) {
904 tape->dsc_polling_start = jiffies;
905 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
906 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
907 } else if (time_after(jiffies, tape->dsc_timeout)) {
908 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
910 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
911 idetape_media_access_finished(drive);
914 return ide_do_reset(drive);
916 } else if (time_after(jiffies,
917 tape->dsc_polling_start +
918 IDETAPE_DSC_MA_THRESHOLD))
919 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
920 idetape_postpone_request(drive);
923 if (rq->cmd[13] & REQ_IDETAPE_READ) {
924 pc = &tape->queued_pc;
925 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
928 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
929 pc = &tape->queued_pc;
930 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
933 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
934 pc = (struct ide_atapi_pc *) rq->buffer;
935 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
936 rq->cmd[13] |= REQ_IDETAPE_PC2;
939 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
940 idetape_media_access_finished(drive);
946 return idetape_issue_pc(drive, pc);
950 * The function below uses __get_free_pages to allocate a data buffer of size
951 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
954 * It returns a pointer to the newly allocated buffer, or NULL in case of
957 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
960 struct idetape_bh *prev_bh, *bh, *merge_bh;
961 int pages = tape->pages_per_buffer;
962 unsigned int order, b_allocd;
965 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
970 order = fls(pages) - 1;
971 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
974 b_allocd = (1 << order) * PAGE_SIZE;
978 memset(bh->b_data, 0, b_allocd);
979 bh->b_reqnext = NULL;
980 bh->b_size = b_allocd;
981 atomic_set(&bh->b_count, full ? bh->b_size : 0);
984 order = fls(pages) - 1;
985 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
988 b_allocd = (1 << order) * PAGE_SIZE;
991 memset(b_data, 0, b_allocd);
993 /* newly allocated page frames below buffer header or ...*/
994 if (bh->b_data == b_data + b_allocd) {
995 bh->b_size += b_allocd;
996 bh->b_data -= b_allocd;
998 atomic_add(b_allocd, &bh->b_count);
1001 /* they are above the header */
1002 if (b_data == bh->b_data + bh->b_size) {
1003 bh->b_size += b_allocd;
1005 atomic_add(b_allocd, &bh->b_count);
1009 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1011 free_pages((unsigned long) b_data, order);
1014 bh->b_reqnext = NULL;
1015 bh->b_data = b_data;
1016 bh->b_size = b_allocd;
1017 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1018 prev_bh->b_reqnext = bh;
1023 bh->b_size -= tape->excess_bh_size;
1025 atomic_sub(tape->excess_bh_size, &bh->b_count);
1028 ide_tape_kfree_buffer(tape);
1032 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1033 const char __user *buf, int n)
1035 struct idetape_bh *bh = tape->bh;
1041 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1045 count = min((unsigned int)
1046 (bh->b_size - atomic_read(&bh->b_count)),
1048 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1052 atomic_add(count, &bh->b_count);
1054 if (atomic_read(&bh->b_count) == bh->b_size) {
1057 atomic_set(&bh->b_count, 0);
1064 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1067 struct idetape_bh *bh = tape->bh;
1073 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1077 count = min(tape->b_count, n);
1078 if (copy_to_user(buf, tape->b_data, count))
1081 tape->b_data += count;
1082 tape->b_count -= count;
1084 if (!tape->b_count) {
1088 tape->b_data = bh->b_data;
1089 tape->b_count = atomic_read(&bh->b_count);
1096 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1098 struct idetape_bh *bh = tape->merge_bh;
1099 tape->bh = tape->merge_bh;
1101 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1102 atomic_set(&bh->b_count, 0);
1104 tape->b_data = bh->b_data;
1105 tape->b_count = atomic_read(&bh->b_count);
1110 * Write a filemark if write_filemark=1. Flush the device buffers without
1111 * writing a filemark otherwise.
1113 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1114 struct ide_atapi_pc *pc, int write_filemark)
1117 pc->c[0] = WRITE_FILEMARKS;
1118 pc->c[4] = write_filemark;
1119 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1122 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1125 pc->c[0] = TEST_UNIT_READY;
1128 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1130 idetape_tape_t *tape = drive->driver_data;
1131 struct gendisk *disk = tape->disk;
1132 struct ide_atapi_pc pc;
1133 int load_attempted = 0;
1135 /* Wait for the tape to become ready */
1136 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1138 while (time_before(jiffies, timeout)) {
1139 idetape_create_test_unit_ready_cmd(&pc);
1140 if (!ide_queue_pc_tail(drive, disk, &pc))
1142 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1143 || (tape->asc == 0x3A)) {
1147 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1149 /* not about to be ready */
1150 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1151 (tape->ascq == 1 || tape->ascq == 8)))
1158 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1160 struct ide_tape_obj *tape = drive->driver_data;
1161 struct ide_atapi_pc pc;
1164 idetape_create_write_filemark_cmd(drive, &pc, 0);
1165 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1168 idetape_wait_ready(drive, 60 * 5 * HZ);
1172 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1175 pc->c[0] = READ_POSITION;
1179 static int idetape_read_position(ide_drive_t *drive)
1181 idetape_tape_t *tape = drive->driver_data;
1182 struct ide_atapi_pc pc;
1185 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1187 idetape_create_read_position_cmd(&pc);
1188 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1190 position = tape->first_frame;
1194 static void idetape_create_locate_cmd(ide_drive_t *drive,
1195 struct ide_atapi_pc *pc,
1196 unsigned int block, u8 partition, int skip)
1199 pc->c[0] = POSITION_TO_ELEMENT;
1201 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1202 pc->c[8] = partition;
1203 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1206 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1208 idetape_tape_t *tape = drive->driver_data;
1210 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1213 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1214 tape->merge_bh_size = 0;
1215 if (tape->merge_bh != NULL) {
1216 ide_tape_kfree_buffer(tape);
1217 tape->merge_bh = NULL;
1220 tape->chrdev_dir = IDETAPE_DIR_NONE;
1224 * Position the tape to the requested block using the LOCATE packet command.
1225 * A READ POSITION command is then issued to check where we are positioned. Like
1226 * all higher level operations, we queue the commands at the tail of the request
1227 * queue and wait for their completion.
1229 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1230 u8 partition, int skip)
1232 idetape_tape_t *tape = drive->driver_data;
1233 struct gendisk *disk = tape->disk;
1235 struct ide_atapi_pc pc;
1237 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1238 __ide_tape_discard_merge_buffer(drive);
1239 idetape_wait_ready(drive, 60 * 5 * HZ);
1240 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1241 retval = ide_queue_pc_tail(drive, disk, &pc);
1245 idetape_create_read_position_cmd(&pc);
1246 return ide_queue_pc_tail(drive, disk, &pc);
1249 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1250 int restore_position)
1252 idetape_tape_t *tape = drive->driver_data;
1255 __ide_tape_discard_merge_buffer(drive);
1256 if (restore_position) {
1257 position = idetape_read_position(drive);
1258 seek = position > 0 ? position : 0;
1259 if (idetape_position_tape(drive, seek, 0, 0)) {
1260 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1261 " %s\n", tape->name, __func__);
1268 * Generate a read/write request for the block device interface and wait for it
1271 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1272 struct idetape_bh *bh)
1274 idetape_tape_t *tape = drive->driver_data;
1278 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1280 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1281 rq->cmd_type = REQ_TYPE_SPECIAL;
1283 rq->rq_disk = tape->disk;
1284 rq->special = (void *)bh;
1285 rq->sector = tape->first_frame;
1286 rq->nr_sectors = blocks;
1287 rq->current_nr_sectors = blocks;
1288 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1290 errors = rq->errors;
1291 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1292 blk_put_request(rq);
1294 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1298 idetape_init_merge_buffer(tape);
1299 if (errors == IDETAPE_ERROR_GENERAL)
1304 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1312 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1313 struct ide_atapi_pc *pc)
1316 pc->c[0] = REZERO_UNIT;
1317 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1320 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1325 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1328 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1332 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1334 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1337 /* Queue up a character device originated write request. */
1338 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1340 idetape_tape_t *tape = drive->driver_data;
1342 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1344 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1345 blocks, tape->merge_bh);
1348 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1350 idetape_tape_t *tape = drive->driver_data;
1352 struct idetape_bh *bh;
1354 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1355 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1356 " but we are not writing.\n");
1359 if (tape->merge_bh_size > tape->buffer_size) {
1360 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1361 tape->merge_bh_size = tape->buffer_size;
1363 if (tape->merge_bh_size) {
1364 blocks = tape->merge_bh_size / tape->blk_size;
1365 if (tape->merge_bh_size % tape->blk_size) {
1369 i = tape->blk_size - tape->merge_bh_size %
1371 bh = tape->bh->b_reqnext;
1373 atomic_set(&bh->b_count, 0);
1379 printk(KERN_INFO "ide-tape: bug,"
1383 min = min(i, (unsigned int)(bh->b_size -
1384 atomic_read(&bh->b_count)));
1385 memset(bh->b_data + atomic_read(&bh->b_count),
1387 atomic_add(min, &bh->b_count);
1392 (void) idetape_add_chrdev_write_request(drive, blocks);
1393 tape->merge_bh_size = 0;
1395 if (tape->merge_bh != NULL) {
1396 ide_tape_kfree_buffer(tape);
1397 tape->merge_bh = NULL;
1399 tape->chrdev_dir = IDETAPE_DIR_NONE;
1402 static int idetape_init_read(ide_drive_t *drive)
1404 idetape_tape_t *tape = drive->driver_data;
1407 /* Initialize read operation */
1408 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1409 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1410 ide_tape_flush_merge_buffer(drive);
1411 idetape_flush_tape_buffers(drive);
1413 if (tape->merge_bh || tape->merge_bh_size) {
1414 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1416 tape->merge_bh_size = 0;
1418 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1419 if (!tape->merge_bh)
1421 tape->chrdev_dir = IDETAPE_DIR_READ;
1424 * Issue a read 0 command to ensure that DSC handshake is
1425 * switched from completion mode to buffer available mode.
1426 * No point in issuing this if DSC overlap isn't supported, some
1427 * drives (Seagate STT3401A) will return an error.
1429 if (drive->dsc_overlap) {
1430 bytes_read = idetape_queue_rw_tail(drive,
1431 REQ_IDETAPE_READ, 0,
1433 if (bytes_read < 0) {
1434 ide_tape_kfree_buffer(tape);
1435 tape->merge_bh = NULL;
1436 tape->chrdev_dir = IDETAPE_DIR_NONE;
1445 /* called from idetape_chrdev_read() to service a chrdev read request. */
1446 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1448 idetape_tape_t *tape = drive->driver_data;
1450 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1452 /* If we are at a filemark, return a read length of 0 */
1453 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1456 idetape_init_read(drive);
1458 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1462 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1464 idetape_tape_t *tape = drive->driver_data;
1465 struct idetape_bh *bh;
1471 bh = tape->merge_bh;
1472 count = min(tape->buffer_size, bcount);
1474 blocks = count / tape->blk_size;
1476 atomic_set(&bh->b_count,
1477 min(count, (unsigned int)bh->b_size));
1478 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1479 count -= atomic_read(&bh->b_count);
1482 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1488 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1489 * currently support only one partition.
1491 static int idetape_rewind_tape(ide_drive_t *drive)
1493 struct ide_tape_obj *tape = drive->driver_data;
1494 struct gendisk *disk = tape->disk;
1496 struct ide_atapi_pc pc;
1498 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1500 idetape_create_rewind_cmd(drive, &pc);
1501 retval = ide_queue_pc_tail(drive, disk, &pc);
1505 idetape_create_read_position_cmd(&pc);
1506 retval = ide_queue_pc_tail(drive, disk, &pc);
1512 /* mtio.h compatible commands should be issued to the chrdev interface. */
1513 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1516 idetape_tape_t *tape = drive->driver_data;
1517 void __user *argp = (void __user *)arg;
1519 struct idetape_config {
1520 int dsc_rw_frequency;
1521 int dsc_media_access_frequency;
1525 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1529 if (copy_from_user(&config, argp, sizeof(config)))
1531 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1534 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1535 config.nr_stages = 1;
1536 if (copy_to_user(argp, &config, sizeof(config)))
1545 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1548 idetape_tape_t *tape = drive->driver_data;
1549 struct gendisk *disk = tape->disk;
1550 struct ide_atapi_pc pc;
1551 int retval, count = 0;
1552 int sprev = !!(tape->caps[4] & 0x20);
1556 if (MTBSF == mt_op || MTBSFM == mt_op) {
1559 mt_count = -mt_count;
1562 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1563 tape->merge_bh_size = 0;
1564 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1566 ide_tape_discard_merge_buffer(drive, 0);
1572 idetape_create_space_cmd(&pc, mt_count - count,
1573 IDETAPE_SPACE_OVER_FILEMARK);
1574 return ide_queue_pc_tail(drive, disk, &pc);
1579 retval = idetape_space_over_filemarks(drive, MTFSF,
1583 count = (MTBSFM == mt_op ? 1 : -1);
1584 return idetape_space_over_filemarks(drive, MTFSF, count);
1586 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1593 * Our character device read / write functions.
1595 * The tape is optimized to maximize throughput when it is transferring an
1596 * integral number of the "continuous transfer limit", which is a parameter of
1597 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1599 * As of version 1.3 of the driver, the character device provides an abstract
1600 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1601 * same backup/restore procedure is supported. The driver will internally
1602 * convert the requests to the recommended transfer unit, so that an unmatch
1603 * between the user's block size to the recommended size will only result in a
1604 * (slightly) increased driver overhead, but will no longer hit performance.
1605 * This is not applicable to Onstream.
1607 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1608 size_t count, loff_t *ppos)
1610 struct ide_tape_obj *tape = ide_tape_f(file);
1611 ide_drive_t *drive = tape->drive;
1612 ssize_t bytes_read, temp, actually_read = 0, rc;
1614 u16 ctl = *(u16 *)&tape->caps[12];
1616 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1618 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1619 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1620 if (count > tape->blk_size &&
1621 (count % tape->blk_size) == 0)
1622 tape->user_bs_factor = count / tape->blk_size;
1624 rc = idetape_init_read(drive);
1629 if (tape->merge_bh_size) {
1630 actually_read = min((unsigned int)(tape->merge_bh_size),
1631 (unsigned int)count);
1632 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1634 buf += actually_read;
1635 tape->merge_bh_size -= actually_read;
1636 count -= actually_read;
1638 while (count >= tape->buffer_size) {
1639 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1640 if (bytes_read <= 0)
1642 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1645 count -= bytes_read;
1646 actually_read += bytes_read;
1649 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1650 if (bytes_read <= 0)
1652 temp = min((unsigned long)count, (unsigned long)bytes_read);
1653 if (idetape_copy_stage_to_user(tape, buf, temp))
1655 actually_read += temp;
1656 tape->merge_bh_size = bytes_read-temp;
1659 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1660 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1662 idetape_space_over_filemarks(drive, MTFSF, 1);
1666 return ret ? ret : actually_read;
1669 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1670 size_t count, loff_t *ppos)
1672 struct ide_tape_obj *tape = ide_tape_f(file);
1673 ide_drive_t *drive = tape->drive;
1674 ssize_t actually_written = 0;
1676 u16 ctl = *(u16 *)&tape->caps[12];
1678 /* The drive is write protected. */
1679 if (tape->write_prot)
1682 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1684 /* Initialize write operation */
1685 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1686 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1687 ide_tape_discard_merge_buffer(drive, 1);
1688 if (tape->merge_bh || tape->merge_bh_size) {
1689 printk(KERN_ERR "ide-tape: merge_bh_size "
1690 "should be 0 now\n");
1691 tape->merge_bh_size = 0;
1693 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1694 if (!tape->merge_bh)
1696 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1697 idetape_init_merge_buffer(tape);
1700 * Issue a write 0 command to ensure that DSC handshake is
1701 * switched from completion mode to buffer available mode. No
1702 * point in issuing this if DSC overlap isn't supported, some
1703 * drives (Seagate STT3401A) will return an error.
1705 if (drive->dsc_overlap) {
1706 ssize_t retval = idetape_queue_rw_tail(drive,
1707 REQ_IDETAPE_WRITE, 0,
1710 ide_tape_kfree_buffer(tape);
1711 tape->merge_bh = NULL;
1712 tape->chrdev_dir = IDETAPE_DIR_NONE;
1719 if (tape->merge_bh_size) {
1720 if (tape->merge_bh_size >= tape->buffer_size) {
1721 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1722 tape->merge_bh_size = 0;
1724 actually_written = min((unsigned int)
1725 (tape->buffer_size - tape->merge_bh_size),
1726 (unsigned int)count);
1727 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1729 buf += actually_written;
1730 tape->merge_bh_size += actually_written;
1731 count -= actually_written;
1733 if (tape->merge_bh_size == tape->buffer_size) {
1735 tape->merge_bh_size = 0;
1736 retval = idetape_add_chrdev_write_request(drive, ctl);
1741 while (count >= tape->buffer_size) {
1743 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1745 buf += tape->buffer_size;
1746 count -= tape->buffer_size;
1747 retval = idetape_add_chrdev_write_request(drive, ctl);
1748 actually_written += tape->buffer_size;
1753 actually_written += count;
1754 if (idetape_copy_stage_from_user(tape, buf, count))
1756 tape->merge_bh_size += count;
1758 return ret ? ret : actually_written;
1761 static int idetape_write_filemark(ide_drive_t *drive)
1763 struct ide_tape_obj *tape = drive->driver_data;
1764 struct ide_atapi_pc pc;
1766 /* Write a filemark */
1767 idetape_create_write_filemark_cmd(drive, &pc, 1);
1768 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1769 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1776 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1779 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1780 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1781 * usually not supported.
1783 * The following commands are currently not supported:
1785 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1786 * MT_ST_WRITE_THRESHOLD.
1788 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1790 idetape_tape_t *tape = drive->driver_data;
1791 struct gendisk *disk = tape->disk;
1792 struct ide_atapi_pc pc;
1795 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1805 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1812 if (tape->write_prot)
1814 ide_tape_discard_merge_buffer(drive, 1);
1815 for (i = 0; i < mt_count; i++) {
1816 retval = idetape_write_filemark(drive);
1822 ide_tape_discard_merge_buffer(drive, 0);
1823 if (idetape_rewind_tape(drive))
1827 ide_tape_discard_merge_buffer(drive, 0);
1828 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1832 * If door is locked, attempt to unlock before
1833 * attempting to eject.
1835 if (tape->door_locked) {
1836 if (!ide_set_media_lock(drive, disk, 0))
1837 tape->door_locked = DOOR_UNLOCKED;
1839 ide_tape_discard_merge_buffer(drive, 0);
1840 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1842 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1845 ide_tape_discard_merge_buffer(drive, 0);
1846 return idetape_flush_tape_buffers(drive);
1848 ide_tape_discard_merge_buffer(drive, 0);
1849 return ide_do_start_stop(drive, disk,
1850 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1852 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1853 return ide_queue_pc_tail(drive, disk, &pc);
1855 (void)idetape_rewind_tape(drive);
1856 idetape_create_erase_cmd(&pc);
1857 return ide_queue_pc_tail(drive, disk, &pc);
1860 if (mt_count < tape->blk_size ||
1861 mt_count % tape->blk_size)
1863 tape->user_bs_factor = mt_count / tape->blk_size;
1864 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1866 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1869 ide_tape_discard_merge_buffer(drive, 0);
1870 return idetape_position_tape(drive,
1871 mt_count * tape->user_bs_factor, tape->partition, 0);
1873 ide_tape_discard_merge_buffer(drive, 0);
1874 return idetape_position_tape(drive, 0, mt_count, 0);
1878 retval = ide_set_media_lock(drive, disk, 1);
1881 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1884 retval = ide_set_media_lock(drive, disk, 0);
1887 tape->door_locked = DOOR_UNLOCKED;
1890 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1897 * Our character device ioctls. General mtio.h magnetic io commands are
1898 * supported here, and not in the corresponding block interface. Our own
1899 * ide-tape ioctls are supported on both interfaces.
1901 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1902 unsigned int cmd, unsigned long arg)
1904 struct ide_tape_obj *tape = ide_tape_f(file);
1905 ide_drive_t *drive = tape->drive;
1909 int block_offset = 0, position = tape->first_frame;
1910 void __user *argp = (void __user *)arg;
1912 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1914 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1915 ide_tape_flush_merge_buffer(drive);
1916 idetape_flush_tape_buffers(drive);
1918 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1919 block_offset = tape->merge_bh_size /
1920 (tape->blk_size * tape->user_bs_factor);
1921 position = idetape_read_position(drive);
1927 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1929 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1931 memset(&mtget, 0, sizeof(struct mtget));
1932 mtget.mt_type = MT_ISSCSI2;
1933 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1935 ((tape->blk_size * tape->user_bs_factor)
1936 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1938 if (tape->drv_write_prot)
1939 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1941 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1945 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1946 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1950 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1951 ide_tape_discard_merge_buffer(drive, 1);
1952 return idetape_blkdev_ioctl(drive, cmd, arg);
1957 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1958 * block size with the reported value.
1960 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1962 idetape_tape_t *tape = drive->driver_data;
1963 struct ide_atapi_pc pc;
1965 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1966 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1967 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1968 if (tape->blk_size == 0) {
1969 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1970 "block size, assuming 32k\n");
1971 tape->blk_size = 32768;
1975 tape->blk_size = (pc.buf[4 + 5] << 16) +
1976 (pc.buf[4 + 6] << 8) +
1978 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1981 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1983 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1985 idetape_tape_t *tape;
1988 if (i >= MAX_HWIFS * MAX_DRIVES)
1992 tape = ide_tape_chrdev_get(i);
1998 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2001 * We really want to do nonseekable_open(inode, filp); here, but some
2002 * versions of tar incorrectly call lseek on tapes and bail out if that
2003 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2005 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2007 drive = tape->drive;
2009 filp->private_data = tape;
2011 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
2016 retval = idetape_wait_ready(drive, 60 * HZ);
2018 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2019 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2023 idetape_read_position(drive);
2024 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2025 (void)idetape_rewind_tape(drive);
2027 /* Read block size and write protect status from drive. */
2028 ide_tape_get_bsize_from_bdesc(drive);
2030 /* Set write protect flag if device is opened as read-only. */
2031 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2032 tape->write_prot = 1;
2034 tape->write_prot = tape->drv_write_prot;
2036 /* Make sure drive isn't write protected if user wants to write. */
2037 if (tape->write_prot) {
2038 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2039 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2040 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2046 /* Lock the tape drive door so user can't eject. */
2047 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2048 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2049 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2050 tape->door_locked = DOOR_LOCKED;
2062 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2064 idetape_tape_t *tape = drive->driver_data;
2066 ide_tape_flush_merge_buffer(drive);
2067 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2068 if (tape->merge_bh != NULL) {
2069 idetape_pad_zeros(drive, tape->blk_size *
2070 (tape->user_bs_factor - 1));
2071 ide_tape_kfree_buffer(tape);
2072 tape->merge_bh = NULL;
2074 idetape_write_filemark(drive);
2075 idetape_flush_tape_buffers(drive);
2076 idetape_flush_tape_buffers(drive);
2079 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2081 struct ide_tape_obj *tape = ide_tape_f(filp);
2082 ide_drive_t *drive = tape->drive;
2083 unsigned int minor = iminor(inode);
2086 tape = drive->driver_data;
2088 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2090 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2091 idetape_write_release(drive, minor);
2092 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2094 ide_tape_discard_merge_buffer(drive, 1);
2097 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2098 (void) idetape_rewind_tape(drive);
2099 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2100 if (tape->door_locked == DOOR_LOCKED) {
2101 if (!ide_set_media_lock(drive, tape->disk, 0))
2102 tape->door_locked = DOOR_UNLOCKED;
2105 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2111 static void idetape_get_inquiry_results(ide_drive_t *drive)
2113 idetape_tape_t *tape = drive->driver_data;
2114 struct ide_atapi_pc pc;
2115 char fw_rev[4], vendor_id[8], product_id[16];
2117 idetape_create_inquiry_cmd(&pc);
2118 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2119 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2123 memcpy(vendor_id, &pc.buf[8], 8);
2124 memcpy(product_id, &pc.buf[16], 16);
2125 memcpy(fw_rev, &pc.buf[32], 4);
2127 ide_fixstring(vendor_id, 8, 0);
2128 ide_fixstring(product_id, 16, 0);
2129 ide_fixstring(fw_rev, 4, 0);
2131 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2132 drive->name, tape->name, vendor_id, product_id, fw_rev);
2136 * Ask the tape about its various parameters. In particular, we will adjust our
2137 * data transfer buffer size to the recommended value as returned by the tape.
2139 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2141 idetape_tape_t *tape = drive->driver_data;
2142 struct ide_atapi_pc pc;
2144 u8 speed, max_speed;
2146 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2147 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2148 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2149 " some default values\n");
2150 tape->blk_size = 512;
2151 put_unaligned(52, (u16 *)&tape->caps[12]);
2152 put_unaligned(540, (u16 *)&tape->caps[14]);
2153 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2156 caps = pc.buf + 4 + pc.buf[3];
2158 /* convert to host order and save for later use */
2159 speed = be16_to_cpup((__be16 *)&caps[14]);
2160 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2162 *(u16 *)&caps[8] = max_speed;
2163 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2164 *(u16 *)&caps[14] = speed;
2165 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2168 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2169 "(assuming 650KB/sec)\n", drive->name);
2170 *(u16 *)&caps[14] = 650;
2173 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2174 "(assuming 650KB/sec)\n", drive->name);
2175 *(u16 *)&caps[8] = 650;
2178 memcpy(&tape->caps, caps, 20);
2180 /* device lacks locking support according to capabilities page */
2181 if ((caps[6] & 1) == 0)
2182 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2185 tape->blk_size = 512;
2186 else if (caps[7] & 0x04)
2187 tape->blk_size = 1024;
2190 #ifdef CONFIG_IDE_PROC_FS
2191 #define ide_tape_devset_get(name, field) \
2192 static int get_##name(ide_drive_t *drive) \
2194 idetape_tape_t *tape = drive->driver_data; \
2195 return tape->field; \
2198 #define ide_tape_devset_set(name, field) \
2199 static int set_##name(ide_drive_t *drive, int arg) \
2201 idetape_tape_t *tape = drive->driver_data; \
2202 tape->field = arg; \
2206 #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \
2207 ide_tape_devset_get(_name, _field) \
2208 ide_tape_devset_set(_name, _field) \
2209 __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf)
2211 #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \
2212 ide_tape_devset_get(_name, _field) \
2213 __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf)
2215 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2216 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2217 static int divf_buffer(ide_drive_t *drive) { return 2; }
2218 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2220 ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap);
2222 ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL);
2223 ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2224 best_dsc_rw_freq, mulf_tdsc, divf_tdsc);
2226 ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL);
2227 ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL);
2228 ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer);
2229 ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size);
2231 static const struct ide_devset *idetape_settings[] = {
2232 &ide_devset_avg_speed,
2234 &ide_devset_buffer_size,
2235 &ide_devset_debug_mask,
2236 &ide_devset_dsc_overlap,
2244 * The function below is called to:
2246 * 1. Initialize our various state variables.
2247 * 2. Ask the tape for its capabilities.
2248 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2249 * is chosen based on the recommendation which we received in step 2.
2251 * Note that at this point ide.c already assigned us an irq, so that we can
2252 * queue requests here and wait for their completion.
2254 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2260 u16 *ctl = (u16 *)&tape->caps[12];
2262 drive->pc_callback = ide_tape_callback;
2264 spin_lock_init(&tape->lock);
2265 drive->dsc_overlap = 1;
2266 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2267 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2269 drive->dsc_overlap = 0;
2271 /* Seagate Travan drives do not support DSC overlap. */
2272 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2273 drive->dsc_overlap = 0;
2274 tape->minor = minor;
2275 tape->name[0] = 'h';
2276 tape->name[1] = 't';
2277 tape->name[2] = '0' + minor;
2278 tape->chrdev_dir = IDETAPE_DIR_NONE;
2280 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2282 /* Command packet DRQ type */
2283 if (((gcw[0] & 0x60) >> 5) == 1)
2284 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2286 idetape_get_inquiry_results(drive);
2287 idetape_get_mode_sense_results(drive);
2288 ide_tape_get_bsize_from_bdesc(drive);
2289 tape->user_bs_factor = 1;
2290 tape->buffer_size = *ctl * tape->blk_size;
2291 while (tape->buffer_size > 0xffff) {
2292 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2294 tape->buffer_size = *ctl * tape->blk_size;
2296 buffer_size = tape->buffer_size;
2297 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2298 if (buffer_size % PAGE_SIZE) {
2299 tape->pages_per_buffer++;
2300 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2303 /* select the "best" DSC read/write polling freq */
2304 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2306 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2309 * Ensure that the number we got makes sense; limit it within
2310 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2312 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2313 IDETAPE_DSC_RW_MAX);
2314 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2316 drive->name, tape->name, *(u16 *)&tape->caps[14],
2317 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2318 tape->buffer_size / 1024,
2319 tape->best_dsc_rw_freq * 1000 / HZ,
2320 drive->using_dma ? ", DMA":"");
2322 ide_proc_register_driver(drive, tape->driver);
2325 static void ide_tape_remove(ide_drive_t *drive)
2327 idetape_tape_t *tape = drive->driver_data;
2329 ide_proc_unregister_driver(drive, tape->driver);
2331 ide_unregister_region(tape->disk);
2336 static void ide_tape_release(struct kref *kref)
2338 struct ide_tape_obj *tape = to_ide_tape(kref);
2339 ide_drive_t *drive = tape->drive;
2340 struct gendisk *g = tape->disk;
2342 BUG_ON(tape->merge_bh_size);
2344 drive->dsc_overlap = 0;
2345 drive->driver_data = NULL;
2346 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2347 device_destroy(idetape_sysfs_class,
2348 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2349 idetape_devs[tape->minor] = NULL;
2350 g->private_data = NULL;
2355 #ifdef CONFIG_IDE_PROC_FS
2356 static int proc_idetape_read_name
2357 (char *page, char **start, off_t off, int count, int *eof, void *data)
2359 ide_drive_t *drive = (ide_drive_t *) data;
2360 idetape_tape_t *tape = drive->driver_data;
2364 len = sprintf(out, "%s\n", tape->name);
2365 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2368 static ide_proc_entry_t idetape_proc[] = {
2369 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2370 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2371 { NULL, 0, NULL, NULL }
2375 static int ide_tape_probe(ide_drive_t *);
2377 static ide_driver_t idetape_driver = {
2379 .owner = THIS_MODULE,
2381 .bus = &ide_bus_type,
2383 .probe = ide_tape_probe,
2384 .remove = ide_tape_remove,
2385 .version = IDETAPE_VERSION,
2387 .do_request = idetape_do_request,
2388 .end_request = idetape_end_request,
2389 .error = __ide_error,
2390 #ifdef CONFIG_IDE_PROC_FS
2391 .proc = idetape_proc,
2392 .settings = idetape_settings,
2396 /* Our character device supporting functions, passed to register_chrdev. */
2397 static const struct file_operations idetape_fops = {
2398 .owner = THIS_MODULE,
2399 .read = idetape_chrdev_read,
2400 .write = idetape_chrdev_write,
2401 .ioctl = idetape_chrdev_ioctl,
2402 .open = idetape_chrdev_open,
2403 .release = idetape_chrdev_release,
2406 static int idetape_open(struct inode *inode, struct file *filp)
2408 struct gendisk *disk = inode->i_bdev->bd_disk;
2409 struct ide_tape_obj *tape;
2411 tape = ide_tape_get(disk);
2418 static int idetape_release(struct inode *inode, struct file *filp)
2420 struct gendisk *disk = inode->i_bdev->bd_disk;
2421 struct ide_tape_obj *tape = ide_tape_g(disk);
2428 static int idetape_ioctl(struct inode *inode, struct file *file,
2429 unsigned int cmd, unsigned long arg)
2431 struct block_device *bdev = inode->i_bdev;
2432 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2433 ide_drive_t *drive = tape->drive;
2434 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2436 err = idetape_blkdev_ioctl(drive, cmd, arg);
2440 static struct block_device_operations idetape_block_ops = {
2441 .owner = THIS_MODULE,
2442 .open = idetape_open,
2443 .release = idetape_release,
2444 .ioctl = idetape_ioctl,
2447 static int ide_tape_probe(ide_drive_t *drive)
2449 idetape_tape_t *tape;
2453 if (!strstr("ide-tape", drive->driver_req))
2456 if (drive->media != ide_tape)
2459 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2460 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2461 " the driver\n", drive->name);
2464 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2466 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2471 g = alloc_disk(1 << PARTN_BITS);
2475 ide_init_disk(g, drive);
2477 kref_init(&tape->kref);
2479 tape->drive = drive;
2480 tape->driver = &idetape_driver;
2483 g->private_data = &tape->driver;
2485 drive->driver_data = tape;
2487 mutex_lock(&idetape_ref_mutex);
2488 for (minor = 0; idetape_devs[minor]; minor++)
2490 idetape_devs[minor] = tape;
2491 mutex_unlock(&idetape_ref_mutex);
2493 idetape_setup(drive, tape, minor);
2495 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2496 MKDEV(IDETAPE_MAJOR, minor), NULL,
2498 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2499 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2502 g->fops = &idetape_block_ops;
2503 ide_register_region(g);
2513 static void __exit idetape_exit(void)
2515 driver_unregister(&idetape_driver.gen_driver);
2516 class_destroy(idetape_sysfs_class);
2517 unregister_chrdev(IDETAPE_MAJOR, "ht");
2520 static int __init idetape_init(void)
2523 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2524 if (IS_ERR(idetape_sysfs_class)) {
2525 idetape_sysfs_class = NULL;
2526 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2531 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2532 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2535 goto out_free_class;
2538 error = driver_register(&idetape_driver.gen_driver);
2540 goto out_free_driver;
2545 driver_unregister(&idetape_driver.gen_driver);
2547 class_destroy(idetape_sysfs_class);
2552 MODULE_ALIAS("ide:*m-tape*");
2553 module_init(idetape_init);
2554 module_exit(idetape_exit);
2555 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2556 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2557 MODULE_LICENSE("GPL");