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 void idetape_create_load_unload_cmd(ide_drive_t *drive,
1129 struct ide_atapi_pc *pc, int cmd)
1132 pc->c[0] = START_STOP;
1134 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1137 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1139 idetape_tape_t *tape = drive->driver_data;
1140 struct gendisk *disk = tape->disk;
1141 struct ide_atapi_pc pc;
1142 int load_attempted = 0;
1144 /* Wait for the tape to become ready */
1145 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1147 while (time_before(jiffies, timeout)) {
1148 idetape_create_test_unit_ready_cmd(&pc);
1149 if (!ide_queue_pc_tail(drive, disk, &pc))
1151 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1152 || (tape->asc == 0x3A)) {
1156 idetape_create_load_unload_cmd(drive, &pc,
1157 IDETAPE_LU_LOAD_MASK);
1158 ide_queue_pc_tail(drive, disk, &pc);
1160 /* not about to be ready */
1161 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1162 (tape->ascq == 1 || tape->ascq == 8)))
1169 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1171 struct ide_tape_obj *tape = drive->driver_data;
1172 struct ide_atapi_pc pc;
1175 idetape_create_write_filemark_cmd(drive, &pc, 0);
1176 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1179 idetape_wait_ready(drive, 60 * 5 * HZ);
1183 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1186 pc->c[0] = READ_POSITION;
1190 static int idetape_read_position(ide_drive_t *drive)
1192 idetape_tape_t *tape = drive->driver_data;
1193 struct ide_atapi_pc pc;
1196 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1198 idetape_create_read_position_cmd(&pc);
1199 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1201 position = tape->first_frame;
1205 static void idetape_create_locate_cmd(ide_drive_t *drive,
1206 struct ide_atapi_pc *pc,
1207 unsigned int block, u8 partition, int skip)
1210 pc->c[0] = POSITION_TO_ELEMENT;
1212 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1213 pc->c[8] = partition;
1214 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1217 static int idetape_create_prevent_cmd(ide_drive_t *drive,
1218 struct ide_atapi_pc *pc, int prevent)
1220 idetape_tape_t *tape = drive->driver_data;
1222 /* device supports locking according to capabilities page */
1223 if (!(tape->caps[6] & 0x01))
1227 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
1232 static int ide_tape_set_media_lock(ide_drive_t *drive, int on)
1234 struct ide_tape_obj *tape = drive->driver_data;
1235 struct ide_atapi_pc pc;
1237 if (!idetape_create_prevent_cmd(drive, &pc, on))
1240 return ide_queue_pc_tail(drive, tape->disk, &pc);
1243 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1245 idetape_tape_t *tape = drive->driver_data;
1247 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1250 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1251 tape->merge_bh_size = 0;
1252 if (tape->merge_bh != NULL) {
1253 ide_tape_kfree_buffer(tape);
1254 tape->merge_bh = NULL;
1257 tape->chrdev_dir = IDETAPE_DIR_NONE;
1261 * Position the tape to the requested block using the LOCATE packet command.
1262 * A READ POSITION command is then issued to check where we are positioned. Like
1263 * all higher level operations, we queue the commands at the tail of the request
1264 * queue and wait for their completion.
1266 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1267 u8 partition, int skip)
1269 idetape_tape_t *tape = drive->driver_data;
1270 struct gendisk *disk = tape->disk;
1272 struct ide_atapi_pc pc;
1274 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1275 __ide_tape_discard_merge_buffer(drive);
1276 idetape_wait_ready(drive, 60 * 5 * HZ);
1277 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1278 retval = ide_queue_pc_tail(drive, disk, &pc);
1282 idetape_create_read_position_cmd(&pc);
1283 return ide_queue_pc_tail(drive, disk, &pc);
1286 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1287 int restore_position)
1289 idetape_tape_t *tape = drive->driver_data;
1292 __ide_tape_discard_merge_buffer(drive);
1293 if (restore_position) {
1294 position = idetape_read_position(drive);
1295 seek = position > 0 ? position : 0;
1296 if (idetape_position_tape(drive, seek, 0, 0)) {
1297 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1298 " %s\n", tape->name, __func__);
1305 * Generate a read/write request for the block device interface and wait for it
1308 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1309 struct idetape_bh *bh)
1311 idetape_tape_t *tape = drive->driver_data;
1315 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1317 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1318 rq->cmd_type = REQ_TYPE_SPECIAL;
1320 rq->rq_disk = tape->disk;
1321 rq->special = (void *)bh;
1322 rq->sector = tape->first_frame;
1323 rq->nr_sectors = blocks;
1324 rq->current_nr_sectors = blocks;
1325 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1327 errors = rq->errors;
1328 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1329 blk_put_request(rq);
1331 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1335 idetape_init_merge_buffer(tape);
1336 if (errors == IDETAPE_ERROR_GENERAL)
1341 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1349 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1350 struct ide_atapi_pc *pc)
1353 pc->c[0] = REZERO_UNIT;
1354 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1357 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1362 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1365 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1369 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1371 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1374 /* Queue up a character device originated write request. */
1375 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1377 idetape_tape_t *tape = drive->driver_data;
1379 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1381 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1382 blocks, tape->merge_bh);
1385 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1387 idetape_tape_t *tape = drive->driver_data;
1389 struct idetape_bh *bh;
1391 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1392 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1393 " but we are not writing.\n");
1396 if (tape->merge_bh_size > tape->buffer_size) {
1397 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1398 tape->merge_bh_size = tape->buffer_size;
1400 if (tape->merge_bh_size) {
1401 blocks = tape->merge_bh_size / tape->blk_size;
1402 if (tape->merge_bh_size % tape->blk_size) {
1406 i = tape->blk_size - tape->merge_bh_size %
1408 bh = tape->bh->b_reqnext;
1410 atomic_set(&bh->b_count, 0);
1416 printk(KERN_INFO "ide-tape: bug,"
1420 min = min(i, (unsigned int)(bh->b_size -
1421 atomic_read(&bh->b_count)));
1422 memset(bh->b_data + atomic_read(&bh->b_count),
1424 atomic_add(min, &bh->b_count);
1429 (void) idetape_add_chrdev_write_request(drive, blocks);
1430 tape->merge_bh_size = 0;
1432 if (tape->merge_bh != NULL) {
1433 ide_tape_kfree_buffer(tape);
1434 tape->merge_bh = NULL;
1436 tape->chrdev_dir = IDETAPE_DIR_NONE;
1439 static int idetape_init_read(ide_drive_t *drive)
1441 idetape_tape_t *tape = drive->driver_data;
1444 /* Initialize read operation */
1445 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1446 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1447 ide_tape_flush_merge_buffer(drive);
1448 idetape_flush_tape_buffers(drive);
1450 if (tape->merge_bh || tape->merge_bh_size) {
1451 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1453 tape->merge_bh_size = 0;
1455 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1456 if (!tape->merge_bh)
1458 tape->chrdev_dir = IDETAPE_DIR_READ;
1461 * Issue a read 0 command to ensure that DSC handshake is
1462 * switched from completion mode to buffer available mode.
1463 * No point in issuing this if DSC overlap isn't supported, some
1464 * drives (Seagate STT3401A) will return an error.
1466 if (drive->dsc_overlap) {
1467 bytes_read = idetape_queue_rw_tail(drive,
1468 REQ_IDETAPE_READ, 0,
1470 if (bytes_read < 0) {
1471 ide_tape_kfree_buffer(tape);
1472 tape->merge_bh = NULL;
1473 tape->chrdev_dir = IDETAPE_DIR_NONE;
1482 /* called from idetape_chrdev_read() to service a chrdev read request. */
1483 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1485 idetape_tape_t *tape = drive->driver_data;
1487 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1489 /* If we are at a filemark, return a read length of 0 */
1490 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1493 idetape_init_read(drive);
1495 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1499 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1501 idetape_tape_t *tape = drive->driver_data;
1502 struct idetape_bh *bh;
1508 bh = tape->merge_bh;
1509 count = min(tape->buffer_size, bcount);
1511 blocks = count / tape->blk_size;
1513 atomic_set(&bh->b_count,
1514 min(count, (unsigned int)bh->b_size));
1515 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1516 count -= atomic_read(&bh->b_count);
1519 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1525 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1526 * currently support only one partition.
1528 static int idetape_rewind_tape(ide_drive_t *drive)
1530 struct ide_tape_obj *tape = drive->driver_data;
1531 struct gendisk *disk = tape->disk;
1533 struct ide_atapi_pc pc;
1535 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1537 idetape_create_rewind_cmd(drive, &pc);
1538 retval = ide_queue_pc_tail(drive, disk, &pc);
1542 idetape_create_read_position_cmd(&pc);
1543 retval = ide_queue_pc_tail(drive, disk, &pc);
1549 /* mtio.h compatible commands should be issued to the chrdev interface. */
1550 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1553 idetape_tape_t *tape = drive->driver_data;
1554 void __user *argp = (void __user *)arg;
1556 struct idetape_config {
1557 int dsc_rw_frequency;
1558 int dsc_media_access_frequency;
1562 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1566 if (copy_from_user(&config, argp, sizeof(config)))
1568 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1571 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1572 config.nr_stages = 1;
1573 if (copy_to_user(argp, &config, sizeof(config)))
1582 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1585 idetape_tape_t *tape = drive->driver_data;
1586 struct gendisk *disk = tape->disk;
1587 struct ide_atapi_pc pc;
1588 int retval, count = 0;
1589 int sprev = !!(tape->caps[4] & 0x20);
1593 if (MTBSF == mt_op || MTBSFM == mt_op) {
1596 mt_count = -mt_count;
1599 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1600 tape->merge_bh_size = 0;
1601 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1603 ide_tape_discard_merge_buffer(drive, 0);
1609 idetape_create_space_cmd(&pc, mt_count - count,
1610 IDETAPE_SPACE_OVER_FILEMARK);
1611 return ide_queue_pc_tail(drive, disk, &pc);
1616 retval = idetape_space_over_filemarks(drive, MTFSF,
1620 count = (MTBSFM == mt_op ? 1 : -1);
1621 return idetape_space_over_filemarks(drive, MTFSF, count);
1623 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1630 * Our character device read / write functions.
1632 * The tape is optimized to maximize throughput when it is transferring an
1633 * integral number of the "continuous transfer limit", which is a parameter of
1634 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1636 * As of version 1.3 of the driver, the character device provides an abstract
1637 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1638 * same backup/restore procedure is supported. The driver will internally
1639 * convert the requests to the recommended transfer unit, so that an unmatch
1640 * between the user's block size to the recommended size will only result in a
1641 * (slightly) increased driver overhead, but will no longer hit performance.
1642 * This is not applicable to Onstream.
1644 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1645 size_t count, loff_t *ppos)
1647 struct ide_tape_obj *tape = ide_tape_f(file);
1648 ide_drive_t *drive = tape->drive;
1649 ssize_t bytes_read, temp, actually_read = 0, rc;
1651 u16 ctl = *(u16 *)&tape->caps[12];
1653 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1655 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1656 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1657 if (count > tape->blk_size &&
1658 (count % tape->blk_size) == 0)
1659 tape->user_bs_factor = count / tape->blk_size;
1661 rc = idetape_init_read(drive);
1666 if (tape->merge_bh_size) {
1667 actually_read = min((unsigned int)(tape->merge_bh_size),
1668 (unsigned int)count);
1669 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1671 buf += actually_read;
1672 tape->merge_bh_size -= actually_read;
1673 count -= actually_read;
1675 while (count >= tape->buffer_size) {
1676 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1677 if (bytes_read <= 0)
1679 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1682 count -= bytes_read;
1683 actually_read += bytes_read;
1686 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1687 if (bytes_read <= 0)
1689 temp = min((unsigned long)count, (unsigned long)bytes_read);
1690 if (idetape_copy_stage_to_user(tape, buf, temp))
1692 actually_read += temp;
1693 tape->merge_bh_size = bytes_read-temp;
1696 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1697 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1699 idetape_space_over_filemarks(drive, MTFSF, 1);
1703 return ret ? ret : actually_read;
1706 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1707 size_t count, loff_t *ppos)
1709 struct ide_tape_obj *tape = ide_tape_f(file);
1710 ide_drive_t *drive = tape->drive;
1711 ssize_t actually_written = 0;
1713 u16 ctl = *(u16 *)&tape->caps[12];
1715 /* The drive is write protected. */
1716 if (tape->write_prot)
1719 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1721 /* Initialize write operation */
1722 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1723 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1724 ide_tape_discard_merge_buffer(drive, 1);
1725 if (tape->merge_bh || tape->merge_bh_size) {
1726 printk(KERN_ERR "ide-tape: merge_bh_size "
1727 "should be 0 now\n");
1728 tape->merge_bh_size = 0;
1730 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1731 if (!tape->merge_bh)
1733 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1734 idetape_init_merge_buffer(tape);
1737 * Issue a write 0 command to ensure that DSC handshake is
1738 * switched from completion mode to buffer available mode. No
1739 * point in issuing this if DSC overlap isn't supported, some
1740 * drives (Seagate STT3401A) will return an error.
1742 if (drive->dsc_overlap) {
1743 ssize_t retval = idetape_queue_rw_tail(drive,
1744 REQ_IDETAPE_WRITE, 0,
1747 ide_tape_kfree_buffer(tape);
1748 tape->merge_bh = NULL;
1749 tape->chrdev_dir = IDETAPE_DIR_NONE;
1756 if (tape->merge_bh_size) {
1757 if (tape->merge_bh_size >= tape->buffer_size) {
1758 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1759 tape->merge_bh_size = 0;
1761 actually_written = min((unsigned int)
1762 (tape->buffer_size - tape->merge_bh_size),
1763 (unsigned int)count);
1764 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1766 buf += actually_written;
1767 tape->merge_bh_size += actually_written;
1768 count -= actually_written;
1770 if (tape->merge_bh_size == tape->buffer_size) {
1772 tape->merge_bh_size = 0;
1773 retval = idetape_add_chrdev_write_request(drive, ctl);
1778 while (count >= tape->buffer_size) {
1780 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1782 buf += tape->buffer_size;
1783 count -= tape->buffer_size;
1784 retval = idetape_add_chrdev_write_request(drive, ctl);
1785 actually_written += tape->buffer_size;
1790 actually_written += count;
1791 if (idetape_copy_stage_from_user(tape, buf, count))
1793 tape->merge_bh_size += count;
1795 return ret ? ret : actually_written;
1798 static int idetape_write_filemark(ide_drive_t *drive)
1800 struct ide_tape_obj *tape = drive->driver_data;
1801 struct ide_atapi_pc pc;
1803 /* Write a filemark */
1804 idetape_create_write_filemark_cmd(drive, &pc, 1);
1805 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1806 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1813 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1816 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1817 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1818 * usually not supported.
1820 * The following commands are currently not supported:
1822 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1823 * MT_ST_WRITE_THRESHOLD.
1825 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1827 idetape_tape_t *tape = drive->driver_data;
1828 struct gendisk *disk = tape->disk;
1829 struct ide_atapi_pc pc;
1832 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1842 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1849 if (tape->write_prot)
1851 ide_tape_discard_merge_buffer(drive, 1);
1852 for (i = 0; i < mt_count; i++) {
1853 retval = idetape_write_filemark(drive);
1859 ide_tape_discard_merge_buffer(drive, 0);
1860 if (idetape_rewind_tape(drive))
1864 ide_tape_discard_merge_buffer(drive, 0);
1865 idetape_create_load_unload_cmd(drive, &pc,
1866 IDETAPE_LU_LOAD_MASK);
1867 return ide_queue_pc_tail(drive, disk, &pc);
1871 * If door is locked, attempt to unlock before
1872 * attempting to eject.
1874 if (tape->door_locked) {
1875 if (!ide_tape_set_media_lock(drive, 0))
1876 tape->door_locked = DOOR_UNLOCKED;
1878 ide_tape_discard_merge_buffer(drive, 0);
1879 idetape_create_load_unload_cmd(drive, &pc,
1880 !IDETAPE_LU_LOAD_MASK);
1881 retval = ide_queue_pc_tail(drive, disk, &pc);
1883 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1886 ide_tape_discard_merge_buffer(drive, 0);
1887 return idetape_flush_tape_buffers(drive);
1889 ide_tape_discard_merge_buffer(drive, 0);
1890 idetape_create_load_unload_cmd(drive, &pc,
1891 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1892 return ide_queue_pc_tail(drive, disk, &pc);
1894 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1895 return ide_queue_pc_tail(drive, disk, &pc);
1897 (void)idetape_rewind_tape(drive);
1898 idetape_create_erase_cmd(&pc);
1899 return ide_queue_pc_tail(drive, disk, &pc);
1902 if (mt_count < tape->blk_size ||
1903 mt_count % tape->blk_size)
1905 tape->user_bs_factor = mt_count / tape->blk_size;
1906 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1908 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1911 ide_tape_discard_merge_buffer(drive, 0);
1912 return idetape_position_tape(drive,
1913 mt_count * tape->user_bs_factor, tape->partition, 0);
1915 ide_tape_discard_merge_buffer(drive, 0);
1916 return idetape_position_tape(drive, 0, mt_count, 0);
1920 retval = ide_tape_set_media_lock(drive, 1);
1923 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1926 retval = ide_tape_set_media_lock(drive, 0);
1929 tape->door_locked = DOOR_UNLOCKED;
1932 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1939 * Our character device ioctls. General mtio.h magnetic io commands are
1940 * supported here, and not in the corresponding block interface. Our own
1941 * ide-tape ioctls are supported on both interfaces.
1943 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1944 unsigned int cmd, unsigned long arg)
1946 struct ide_tape_obj *tape = ide_tape_f(file);
1947 ide_drive_t *drive = tape->drive;
1951 int block_offset = 0, position = tape->first_frame;
1952 void __user *argp = (void __user *)arg;
1954 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1956 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1957 ide_tape_flush_merge_buffer(drive);
1958 idetape_flush_tape_buffers(drive);
1960 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1961 block_offset = tape->merge_bh_size /
1962 (tape->blk_size * tape->user_bs_factor);
1963 position = idetape_read_position(drive);
1969 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1971 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1973 memset(&mtget, 0, sizeof(struct mtget));
1974 mtget.mt_type = MT_ISSCSI2;
1975 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1977 ((tape->blk_size * tape->user_bs_factor)
1978 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1980 if (tape->drv_write_prot)
1981 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1983 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1987 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1988 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1992 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1993 ide_tape_discard_merge_buffer(drive, 1);
1994 return idetape_blkdev_ioctl(drive, cmd, arg);
1999 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2000 * block size with the reported value.
2002 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2004 idetape_tape_t *tape = drive->driver_data;
2005 struct ide_atapi_pc pc;
2007 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2008 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2009 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
2010 if (tape->blk_size == 0) {
2011 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2012 "block size, assuming 32k\n");
2013 tape->blk_size = 32768;
2017 tape->blk_size = (pc.buf[4 + 5] << 16) +
2018 (pc.buf[4 + 6] << 8) +
2020 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
2023 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
2025 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2027 idetape_tape_t *tape;
2030 if (i >= MAX_HWIFS * MAX_DRIVES)
2034 tape = ide_tape_chrdev_get(i);
2040 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2043 * We really want to do nonseekable_open(inode, filp); here, but some
2044 * versions of tar incorrectly call lseek on tapes and bail out if that
2045 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2047 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2049 drive = tape->drive;
2051 filp->private_data = tape;
2053 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
2058 retval = idetape_wait_ready(drive, 60 * HZ);
2060 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2061 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2065 idetape_read_position(drive);
2066 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2067 (void)idetape_rewind_tape(drive);
2069 /* Read block size and write protect status from drive. */
2070 ide_tape_get_bsize_from_bdesc(drive);
2072 /* Set write protect flag if device is opened as read-only. */
2073 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2074 tape->write_prot = 1;
2076 tape->write_prot = tape->drv_write_prot;
2078 /* Make sure drive isn't write protected if user wants to write. */
2079 if (tape->write_prot) {
2080 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2081 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2082 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2088 /* Lock the tape drive door so user can't eject. */
2089 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2090 if (!ide_tape_set_media_lock(drive, 1)) {
2091 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2092 tape->door_locked = DOOR_LOCKED;
2104 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2106 idetape_tape_t *tape = drive->driver_data;
2108 ide_tape_flush_merge_buffer(drive);
2109 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2110 if (tape->merge_bh != NULL) {
2111 idetape_pad_zeros(drive, tape->blk_size *
2112 (tape->user_bs_factor - 1));
2113 ide_tape_kfree_buffer(tape);
2114 tape->merge_bh = NULL;
2116 idetape_write_filemark(drive);
2117 idetape_flush_tape_buffers(drive);
2118 idetape_flush_tape_buffers(drive);
2121 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2123 struct ide_tape_obj *tape = ide_tape_f(filp);
2124 ide_drive_t *drive = tape->drive;
2125 unsigned int minor = iminor(inode);
2128 tape = drive->driver_data;
2130 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2132 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2133 idetape_write_release(drive, minor);
2134 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2136 ide_tape_discard_merge_buffer(drive, 1);
2139 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2140 (void) idetape_rewind_tape(drive);
2141 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2142 if (tape->door_locked == DOOR_LOCKED) {
2143 if (!ide_tape_set_media_lock(drive, 0))
2144 tape->door_locked = DOOR_UNLOCKED;
2147 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2153 static void idetape_get_inquiry_results(ide_drive_t *drive)
2155 idetape_tape_t *tape = drive->driver_data;
2156 struct ide_atapi_pc pc;
2157 char fw_rev[4], vendor_id[8], product_id[16];
2159 idetape_create_inquiry_cmd(&pc);
2160 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2161 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2165 memcpy(vendor_id, &pc.buf[8], 8);
2166 memcpy(product_id, &pc.buf[16], 16);
2167 memcpy(fw_rev, &pc.buf[32], 4);
2169 ide_fixstring(vendor_id, 8, 0);
2170 ide_fixstring(product_id, 16, 0);
2171 ide_fixstring(fw_rev, 4, 0);
2173 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2174 drive->name, tape->name, vendor_id, product_id, fw_rev);
2178 * Ask the tape about its various parameters. In particular, we will adjust our
2179 * data transfer buffer size to the recommended value as returned by the tape.
2181 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2183 idetape_tape_t *tape = drive->driver_data;
2184 struct ide_atapi_pc pc;
2186 u8 speed, max_speed;
2188 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2189 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2190 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2191 " some default values\n");
2192 tape->blk_size = 512;
2193 put_unaligned(52, (u16 *)&tape->caps[12]);
2194 put_unaligned(540, (u16 *)&tape->caps[14]);
2195 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2198 caps = pc.buf + 4 + pc.buf[3];
2200 /* convert to host order and save for later use */
2201 speed = be16_to_cpup((__be16 *)&caps[14]);
2202 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2204 *(u16 *)&caps[8] = max_speed;
2205 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2206 *(u16 *)&caps[14] = speed;
2207 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2210 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2211 "(assuming 650KB/sec)\n", drive->name);
2212 *(u16 *)&caps[14] = 650;
2215 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2216 "(assuming 650KB/sec)\n", drive->name);
2217 *(u16 *)&caps[8] = 650;
2220 memcpy(&tape->caps, caps, 20);
2222 tape->blk_size = 512;
2223 else if (caps[7] & 0x04)
2224 tape->blk_size = 1024;
2227 #ifdef CONFIG_IDE_PROC_FS
2228 #define ide_tape_devset_get(name, field) \
2229 static int get_##name(ide_drive_t *drive) \
2231 idetape_tape_t *tape = drive->driver_data; \
2232 return tape->field; \
2235 #define ide_tape_devset_set(name, field) \
2236 static int set_##name(ide_drive_t *drive, int arg) \
2238 idetape_tape_t *tape = drive->driver_data; \
2239 tape->field = arg; \
2243 #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \
2244 ide_tape_devset_get(_name, _field) \
2245 ide_tape_devset_set(_name, _field) \
2246 __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf)
2248 #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \
2249 ide_tape_devset_get(_name, _field) \
2250 __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf)
2252 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2253 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2254 static int divf_buffer(ide_drive_t *drive) { return 2; }
2255 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2257 ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap);
2259 ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL);
2260 ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2261 best_dsc_rw_freq, mulf_tdsc, divf_tdsc);
2263 ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL);
2264 ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL);
2265 ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer);
2266 ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size);
2268 static const struct ide_devset *idetape_settings[] = {
2269 &ide_devset_avg_speed,
2271 &ide_devset_buffer_size,
2272 &ide_devset_debug_mask,
2273 &ide_devset_dsc_overlap,
2281 * The function below is called to:
2283 * 1. Initialize our various state variables.
2284 * 2. Ask the tape for its capabilities.
2285 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2286 * is chosen based on the recommendation which we received in step 2.
2288 * Note that at this point ide.c already assigned us an irq, so that we can
2289 * queue requests here and wait for their completion.
2291 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2297 u16 *ctl = (u16 *)&tape->caps[12];
2299 drive->pc_callback = ide_tape_callback;
2301 spin_lock_init(&tape->lock);
2302 drive->dsc_overlap = 1;
2303 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2304 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2306 drive->dsc_overlap = 0;
2308 /* Seagate Travan drives do not support DSC overlap. */
2309 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2310 drive->dsc_overlap = 0;
2311 tape->minor = minor;
2312 tape->name[0] = 'h';
2313 tape->name[1] = 't';
2314 tape->name[2] = '0' + minor;
2315 tape->chrdev_dir = IDETAPE_DIR_NONE;
2317 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2319 /* Command packet DRQ type */
2320 if (((gcw[0] & 0x60) >> 5) == 1)
2321 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2323 idetape_get_inquiry_results(drive);
2324 idetape_get_mode_sense_results(drive);
2325 ide_tape_get_bsize_from_bdesc(drive);
2326 tape->user_bs_factor = 1;
2327 tape->buffer_size = *ctl * tape->blk_size;
2328 while (tape->buffer_size > 0xffff) {
2329 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2331 tape->buffer_size = *ctl * tape->blk_size;
2333 buffer_size = tape->buffer_size;
2334 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2335 if (buffer_size % PAGE_SIZE) {
2336 tape->pages_per_buffer++;
2337 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2340 /* select the "best" DSC read/write polling freq */
2341 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2343 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2346 * Ensure that the number we got makes sense; limit it within
2347 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2349 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2350 IDETAPE_DSC_RW_MAX);
2351 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2353 drive->name, tape->name, *(u16 *)&tape->caps[14],
2354 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2355 tape->buffer_size / 1024,
2356 tape->best_dsc_rw_freq * 1000 / HZ,
2357 drive->using_dma ? ", DMA":"");
2359 ide_proc_register_driver(drive, tape->driver);
2362 static void ide_tape_remove(ide_drive_t *drive)
2364 idetape_tape_t *tape = drive->driver_data;
2366 ide_proc_unregister_driver(drive, tape->driver);
2368 ide_unregister_region(tape->disk);
2373 static void ide_tape_release(struct kref *kref)
2375 struct ide_tape_obj *tape = to_ide_tape(kref);
2376 ide_drive_t *drive = tape->drive;
2377 struct gendisk *g = tape->disk;
2379 BUG_ON(tape->merge_bh_size);
2381 drive->dsc_overlap = 0;
2382 drive->driver_data = NULL;
2383 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2384 device_destroy(idetape_sysfs_class,
2385 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2386 idetape_devs[tape->minor] = NULL;
2387 g->private_data = NULL;
2392 #ifdef CONFIG_IDE_PROC_FS
2393 static int proc_idetape_read_name
2394 (char *page, char **start, off_t off, int count, int *eof, void *data)
2396 ide_drive_t *drive = (ide_drive_t *) data;
2397 idetape_tape_t *tape = drive->driver_data;
2401 len = sprintf(out, "%s\n", tape->name);
2402 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2405 static ide_proc_entry_t idetape_proc[] = {
2406 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2407 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2408 { NULL, 0, NULL, NULL }
2412 static int ide_tape_probe(ide_drive_t *);
2414 static ide_driver_t idetape_driver = {
2416 .owner = THIS_MODULE,
2418 .bus = &ide_bus_type,
2420 .probe = ide_tape_probe,
2421 .remove = ide_tape_remove,
2422 .version = IDETAPE_VERSION,
2424 .do_request = idetape_do_request,
2425 .end_request = idetape_end_request,
2426 .error = __ide_error,
2427 #ifdef CONFIG_IDE_PROC_FS
2428 .proc = idetape_proc,
2429 .settings = idetape_settings,
2433 /* Our character device supporting functions, passed to register_chrdev. */
2434 static const struct file_operations idetape_fops = {
2435 .owner = THIS_MODULE,
2436 .read = idetape_chrdev_read,
2437 .write = idetape_chrdev_write,
2438 .ioctl = idetape_chrdev_ioctl,
2439 .open = idetape_chrdev_open,
2440 .release = idetape_chrdev_release,
2443 static int idetape_open(struct inode *inode, struct file *filp)
2445 struct gendisk *disk = inode->i_bdev->bd_disk;
2446 struct ide_tape_obj *tape;
2448 tape = ide_tape_get(disk);
2455 static int idetape_release(struct inode *inode, struct file *filp)
2457 struct gendisk *disk = inode->i_bdev->bd_disk;
2458 struct ide_tape_obj *tape = ide_tape_g(disk);
2465 static int idetape_ioctl(struct inode *inode, struct file *file,
2466 unsigned int cmd, unsigned long arg)
2468 struct block_device *bdev = inode->i_bdev;
2469 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2470 ide_drive_t *drive = tape->drive;
2471 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2473 err = idetape_blkdev_ioctl(drive, cmd, arg);
2477 static struct block_device_operations idetape_block_ops = {
2478 .owner = THIS_MODULE,
2479 .open = idetape_open,
2480 .release = idetape_release,
2481 .ioctl = idetape_ioctl,
2484 static int ide_tape_probe(ide_drive_t *drive)
2486 idetape_tape_t *tape;
2490 if (!strstr("ide-tape", drive->driver_req))
2493 if (drive->media != ide_tape)
2496 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2497 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2498 " the driver\n", drive->name);
2501 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2503 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2508 g = alloc_disk(1 << PARTN_BITS);
2512 ide_init_disk(g, drive);
2514 kref_init(&tape->kref);
2516 tape->drive = drive;
2517 tape->driver = &idetape_driver;
2520 g->private_data = &tape->driver;
2522 drive->driver_data = tape;
2524 mutex_lock(&idetape_ref_mutex);
2525 for (minor = 0; idetape_devs[minor]; minor++)
2527 idetape_devs[minor] = tape;
2528 mutex_unlock(&idetape_ref_mutex);
2530 idetape_setup(drive, tape, minor);
2532 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2533 MKDEV(IDETAPE_MAJOR, minor), NULL,
2535 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2536 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2539 g->fops = &idetape_block_ops;
2540 ide_register_region(g);
2550 static void __exit idetape_exit(void)
2552 driver_unregister(&idetape_driver.gen_driver);
2553 class_destroy(idetape_sysfs_class);
2554 unregister_chrdev(IDETAPE_MAJOR, "ht");
2557 static int __init idetape_init(void)
2560 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2561 if (IS_ERR(idetape_sysfs_class)) {
2562 idetape_sysfs_class = NULL;
2563 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2568 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2569 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2572 goto out_free_class;
2575 error = driver_register(&idetape_driver.gen_driver);
2577 goto out_free_driver;
2582 driver_unregister(&idetape_driver.gen_driver);
2584 class_destroy(idetape_sysfs_class);
2589 MODULE_ALIAS("ide:*m-tape*");
2590 module_init(idetape_init);
2591 module_exit(idetape_exit);
2592 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2593 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2594 MODULE_LICENSE("GPL");