2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV = (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE = (1 << 0),
130 IDETAPE_DIR_READ = (1 << 1),
131 IDETAPE_DIR_WRITE = (1 << 2),
137 struct idetape_bh *b_reqnext;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Error codes returned in rq->errors to the higher part of the driver. */
156 #define IDETAPE_ERROR_GENERAL 101
157 #define IDETAPE_ERROR_FILEMARK 102
158 #define IDETAPE_ERROR_EOD 103
160 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
161 #define IDETAPE_BLOCK_DESCRIPTOR 0
162 #define IDETAPE_CAPABILITIES_PAGE 0x2a
165 * Most of our global data which we need to save even as we leave the driver due
166 * to an interrupt or a timer event is stored in the struct defined below.
168 typedef struct ide_tape_obj {
170 ide_driver_t *driver;
171 struct gendisk *disk;
175 * pc points to the current processed packet command.
177 * failed_pc points to the last failed packet command, or contains
178 * NULL if we do not need to retry any packet command. This is
179 * required since an additional packet command is needed before the
180 * retry, to get detailed information on what went wrong.
182 /* Current packet command */
183 struct ide_atapi_pc *pc;
184 /* Last failed packet command */
185 struct ide_atapi_pc *failed_pc;
186 /* used by REQ_IDETAPE_{READ,WRITE} requests */
187 struct ide_atapi_pc queued_pc;
189 struct ide_atapi_pc request_sense_pc;
190 struct request request_sense_rq;
193 * DSC polling variables.
195 * While polling for DSC we use postponed_rq to postpone the current
196 * request so that ide.c will be able to service pending requests on the
197 * other device. Note that at most we will have only one DSC (usually
198 * data transfer) request in the device request queue.
200 struct request *postponed_rq;
201 /* The time in which we started polling for DSC */
202 unsigned long dsc_polling_start;
203 /* Timer used to poll for dsc */
204 struct timer_list dsc_timer;
205 /* Read/Write dsc polling frequency */
206 unsigned long best_dsc_rw_freq;
207 unsigned long dsc_poll_freq;
208 unsigned long dsc_timeout;
210 /* Read position information */
213 unsigned int first_frame;
215 /* Last error information */
216 u8 sense_key, asc, ascq;
218 /* Character device operation */
222 /* Current character device data transfer direction */
225 /* tape block size, usually 512 or 1024 bytes */
226 unsigned short blk_size;
229 /* Copy of the tape's Capabilities and Mechanical Page */
233 * Active data transfer request parameters.
235 * At most, there is only one ide-tape originated data transfer request
236 * in the device request queue. This allows ide.c to easily service
237 * requests from the other device when we postpone our active request.
240 /* Data buffer size chosen based on the tape's recommendation */
243 struct idetape_bh *merge_bh;
244 /* size of the merge buffer */
246 /* pointer to current buffer head within the merge buffer */
247 struct idetape_bh *bh;
251 int pages_per_buffer;
252 /* Wasted space in each stage */
255 /* protects the ide-tape queue */
258 /* Measures average tape speed */
259 unsigned long avg_time;
263 /* the door is currently locked */
265 /* the tape hardware is write protected */
267 /* the tape is write protected (hardware or opened as read-only) */
273 static DEFINE_MUTEX(idetape_ref_mutex);
275 static struct class *idetape_sysfs_class;
277 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
279 #define ide_tape_g(disk) \
280 container_of((disk)->private_data, struct ide_tape_obj, driver)
282 static void ide_tape_release(struct kref *);
284 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
286 struct ide_tape_obj *tape = NULL;
288 mutex_lock(&idetape_ref_mutex);
289 tape = ide_tape_g(disk);
291 if (ide_device_get(tape->drive))
294 kref_get(&tape->kref);
296 mutex_unlock(&idetape_ref_mutex);
300 static void ide_tape_put(struct ide_tape_obj *tape)
302 ide_drive_t *drive = tape->drive;
304 mutex_lock(&idetape_ref_mutex);
305 kref_put(&tape->kref, ide_tape_release);
306 ide_device_put(drive);
307 mutex_unlock(&idetape_ref_mutex);
311 * The variables below are used for the character device interface. Additional
312 * state variables are defined in our ide_drive_t structure.
314 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
316 #define ide_tape_f(file) ((file)->private_data)
318 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
320 struct ide_tape_obj *tape = NULL;
322 mutex_lock(&idetape_ref_mutex);
323 tape = idetape_devs[i];
325 kref_get(&tape->kref);
326 mutex_unlock(&idetape_ref_mutex);
330 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
333 struct idetape_bh *bh = pc->bh;
338 printk(KERN_ERR "ide-tape: bh == NULL in "
339 "idetape_input_buffers\n");
340 ide_pad_transfer(drive, 0, bcount);
344 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
346 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
347 atomic_read(&bh->b_count), count);
349 atomic_add(count, &bh->b_count);
350 if (atomic_read(&bh->b_count) == bh->b_size) {
353 atomic_set(&bh->b_count, 0);
359 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
362 struct idetape_bh *bh = pc->bh;
367 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
371 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
372 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
375 pc->b_count -= count;
380 pc->b_data = bh->b_data;
381 pc->b_count = atomic_read(&bh->b_count);
387 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
389 struct idetape_bh *bh = pc->bh;
391 unsigned int bcount = pc->xferred;
393 if (pc->flags & PC_FLAG_WRITING)
397 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
401 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
402 atomic_set(&bh->b_count, count);
403 if (atomic_read(&bh->b_count) == bh->b_size)
411 * called on each failed packet command retry to analyze the request sense. We
412 * currently do not utilize this information.
414 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
416 idetape_tape_t *tape = drive->driver_data;
417 struct ide_atapi_pc *pc = tape->failed_pc;
419 tape->sense_key = sense[2] & 0xF;
420 tape->asc = sense[12];
421 tape->ascq = sense[13];
423 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
424 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
426 /* Correct pc->xferred by asking the tape. */
427 if (pc->flags & PC_FLAG_DMA_ERROR) {
428 pc->xferred = pc->req_xfer -
430 get_unaligned_be32(&sense[3]);
431 idetape_update_buffers(drive, pc);
435 * If error was the result of a zero-length read or write command,
436 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
437 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
439 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
441 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
442 if (tape->sense_key == 5) {
443 /* don't report an error, everything's ok */
445 /* don't retry read/write */
446 pc->flags |= PC_FLAG_ABORT;
449 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
450 pc->error = IDETAPE_ERROR_FILEMARK;
451 pc->flags |= PC_FLAG_ABORT;
453 if (pc->c[0] == WRITE_6) {
454 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
455 && tape->asc == 0x0 && tape->ascq == 0x2)) {
456 pc->error = IDETAPE_ERROR_EOD;
457 pc->flags |= PC_FLAG_ABORT;
460 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
461 if (tape->sense_key == 8) {
462 pc->error = IDETAPE_ERROR_EOD;
463 pc->flags |= PC_FLAG_ABORT;
465 if (!(pc->flags & PC_FLAG_ABORT) &&
467 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
471 /* Free data buffers completely. */
472 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
474 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
477 u32 size = bh->b_size;
480 unsigned int order = fls(size >> PAGE_SHIFT)-1;
483 free_pages((unsigned long)bh->b_data, order);
486 bh->b_data += (1 << order) * PAGE_SIZE;
494 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
496 struct request *rq = HWGROUP(drive)->rq;
497 idetape_tape_t *tape = drive->driver_data;
501 debug_log(DBG_PROCS, "Enter %s\n", __func__);
504 case 0: error = IDETAPE_ERROR_GENERAL; break;
505 case 1: error = 0; break;
506 default: error = uptodate;
510 tape->failed_pc = NULL;
512 if (!blk_special_request(rq)) {
513 ide_end_request(drive, uptodate, nr_sects);
517 spin_lock_irqsave(&tape->lock, flags);
519 ide_end_drive_cmd(drive, 0, 0);
521 spin_unlock_irqrestore(&tape->lock, flags);
525 static void ide_tape_handle_dsc(ide_drive_t *);
527 static void ide_tape_callback(ide_drive_t *drive, int dsc)
529 idetape_tape_t *tape = drive->driver_data;
530 struct ide_atapi_pc *pc = tape->pc;
531 int uptodate = pc->error ? 0 : 1;
533 debug_log(DBG_PROCS, "Enter %s\n", __func__);
536 ide_tape_handle_dsc(drive);
538 if (tape->failed_pc == pc)
539 tape->failed_pc = NULL;
541 if (pc->c[0] == REQUEST_SENSE) {
543 idetape_analyze_error(drive, pc->buf);
545 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
546 "itself - Aborting request!\n");
547 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
548 struct request *rq = drive->hwif->hwgroup->rq;
549 int blocks = pc->xferred / tape->blk_size;
551 tape->avg_size += blocks * tape->blk_size;
553 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
554 tape->avg_speed = tape->avg_size * HZ /
555 (jiffies - tape->avg_time) / 1024;
557 tape->avg_time = jiffies;
560 tape->first_frame += blocks;
561 rq->current_nr_sectors -= blocks;
564 uptodate = pc->error;
565 } else if (pc->c[0] == READ_POSITION && uptodate) {
566 u8 *readpos = tape->pc->buf;
568 debug_log(DBG_SENSE, "BOP - %s\n",
569 (readpos[0] & 0x80) ? "Yes" : "No");
570 debug_log(DBG_SENSE, "EOP - %s\n",
571 (readpos[0] & 0x40) ? "Yes" : "No");
573 if (readpos[0] & 0x4) {
574 printk(KERN_INFO "ide-tape: Block location is unknown"
576 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
579 debug_log(DBG_SENSE, "Block Location - %u\n",
580 be32_to_cpup((__be32 *)&readpos[4]));
582 tape->partition = readpos[1];
583 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
584 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
588 idetape_end_request(drive, uptodate, 0);
591 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
594 pc->c[0] = REQUEST_SENSE;
600 * idetape_retry_pc is called when an error was detected during the
601 * last packet command. We queue a request sense packet command in
602 * the head of the request list.
604 static void idetape_retry_pc(ide_drive_t *drive)
606 struct ide_tape_obj *tape = drive->driver_data;
607 struct request *rq = &tape->request_sense_rq;
608 struct ide_atapi_pc *pc = &tape->request_sense_pc;
610 (void)ide_read_error(drive);
611 idetape_create_request_sense_cmd(pc);
612 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
613 ide_queue_pc_head(drive, tape->disk, pc, rq);
617 * Postpone the current request so that ide.c will be able to service requests
618 * from another device on the same hwgroup while we are polling for DSC.
620 static void idetape_postpone_request(ide_drive_t *drive)
622 idetape_tape_t *tape = drive->driver_data;
624 debug_log(DBG_PROCS, "Enter %s\n", __func__);
626 tape->postponed_rq = HWGROUP(drive)->rq;
627 ide_stall_queue(drive, tape->dsc_poll_freq);
630 static void ide_tape_handle_dsc(ide_drive_t *drive)
632 idetape_tape_t *tape = drive->driver_data;
634 /* Media access command */
635 tape->dsc_polling_start = jiffies;
636 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
637 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
638 /* Allow ide.c to handle other requests */
639 idetape_postpone_request(drive);
642 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
643 unsigned int bcount, int write)
646 idetape_output_buffers(drive, pc, bcount);
648 idetape_input_buffers(drive, pc, bcount);
654 * This is the usual interrupt handler which will be called during a packet
655 * command. We will transfer some of the data (as requested by the drive) and
656 * will re-point interrupt handler to us. When data transfer is finished, we
657 * will act according to the algorithm described before
660 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
662 idetape_tape_t *tape = drive->driver_data;
664 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, WAIT_TAPE_CMD,
665 NULL, idetape_update_buffers, idetape_retry_pc,
666 ide_tape_io_buffers);
670 * Packet Command Interface
672 * The current Packet Command is available in tape->pc, and will not change
673 * until we finish handling it. Each packet command is associated with a
674 * callback function that will be called when the command is finished.
676 * The handling will be done in three stages:
678 * 1. idetape_issue_pc will send the packet command to the drive, and will set
679 * the interrupt handler to idetape_pc_intr.
681 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
682 * repeated until the device signals us that no more interrupts will be issued.
684 * 3. ATAPI Tape media access commands have immediate status with a delayed
685 * process. In case of a successful initiation of a media access packet command,
686 * the DSC bit will be set when the actual execution of the command is finished.
687 * Since the tape drive will not issue an interrupt, we have to poll for this
688 * event. In this case, we define the request as "low priority request" by
689 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
692 * ide.c will then give higher priority to requests which originate from the
693 * other device, until will change rq_status to RQ_ACTIVE.
695 * 4. When the packet command is finished, it will be checked for errors.
697 * 5. In case an error was found, we queue a request sense packet command in
698 * front of the request queue and retry the operation up to
699 * IDETAPE_MAX_PC_RETRIES times.
701 * 6. In case no error was found, or we decided to give up and not to retry
702 * again, the callback function will be called and then we will handle the next
705 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
707 idetape_tape_t *tape = drive->driver_data;
709 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
710 WAIT_TAPE_CMD, NULL);
713 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
714 struct ide_atapi_pc *pc)
716 idetape_tape_t *tape = drive->driver_data;
718 if (tape->pc->c[0] == REQUEST_SENSE &&
719 pc->c[0] == REQUEST_SENSE) {
720 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
721 "Two request sense in serial were issued\n");
724 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
725 tape->failed_pc = pc;
726 /* Set the current packet command */
729 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
730 (pc->flags & PC_FLAG_ABORT)) {
732 * We will "abort" retrying a packet command in case legitimate
733 * error code was received (crossing a filemark, or end of the
734 * media, for example).
736 if (!(pc->flags & PC_FLAG_ABORT)) {
737 if (!(pc->c[0] == TEST_UNIT_READY &&
738 tape->sense_key == 2 && tape->asc == 4 &&
739 (tape->ascq == 1 || tape->ascq == 8))) {
740 printk(KERN_ERR "ide-tape: %s: I/O error, "
741 "pc = %2x, key = %2x, "
742 "asc = %2x, ascq = %2x\n",
743 tape->name, pc->c[0],
744 tape->sense_key, tape->asc,
748 pc->error = IDETAPE_ERROR_GENERAL;
750 tape->failed_pc = NULL;
751 drive->pc_callback(drive, 0);
754 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
758 return ide_issue_pc(drive, pc, idetape_transfer_pc,
759 WAIT_TAPE_CMD, NULL);
762 /* A mode sense command is used to "sense" tape parameters. */
763 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
766 pc->c[0] = MODE_SENSE;
767 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
768 /* DBD = 1 - Don't return block descriptors */
770 pc->c[2] = page_code;
772 * Changed pc->c[3] to 0 (255 will at best return unused info).
774 * For SCSI this byte is defined as subpage instead of high byte
775 * of length and some IDE drives seem to interpret it this way
776 * and return an error when 255 is used.
779 /* We will just discard data in that case */
781 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
783 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
789 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
791 ide_hwif_t *hwif = drive->hwif;
792 idetape_tape_t *tape = drive->driver_data;
793 struct ide_atapi_pc *pc = tape->pc;
796 stat = hwif->tp_ops->read_status(hwif);
798 if (stat & ATA_DSC) {
799 if (stat & ATA_ERR) {
801 if (pc->c[0] != TEST_UNIT_READY)
802 printk(KERN_ERR "ide-tape: %s: I/O error, ",
804 /* Retry operation */
805 idetape_retry_pc(drive);
810 pc->error = IDETAPE_ERROR_GENERAL;
811 tape->failed_pc = NULL;
813 drive->pc_callback(drive, 0);
817 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
818 struct ide_atapi_pc *pc, struct request *rq,
821 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
822 unsigned int length = rq->current_nr_sectors;
825 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
829 pc->buf_size = length * tape->blk_size;
830 pc->req_xfer = pc->buf_size;
831 if (pc->req_xfer == tape->buffer_size)
832 pc->flags |= PC_FLAG_DMA_OK;
834 if (opcode == READ_6) {
836 atomic_set(&bh->b_count, 0);
837 } else if (opcode == WRITE_6) {
839 pc->flags |= PC_FLAG_WRITING;
840 pc->b_data = bh->b_data;
841 pc->b_count = atomic_read(&bh->b_count);
844 memcpy(rq->cmd, pc->c, 12);
847 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
848 struct request *rq, sector_t block)
850 ide_hwif_t *hwif = drive->hwif;
851 idetape_tape_t *tape = drive->driver_data;
852 struct ide_atapi_pc *pc = NULL;
853 struct request *postponed_rq = tape->postponed_rq;
856 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
857 " current_nr_sectors: %u\n",
858 (unsigned long long)rq->sector, rq->nr_sectors,
859 rq->current_nr_sectors);
861 if (!blk_special_request(rq)) {
862 /* We do not support buffer cache originated requests. */
863 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
864 "request queue (%d)\n", drive->name, rq->cmd_type);
865 ide_end_request(drive, 0, 0);
869 /* Retry a failed packet command */
870 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
871 pc = tape->failed_pc;
875 if (postponed_rq != NULL)
876 if (rq != postponed_rq) {
877 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
878 "Two DSC requests were queued\n");
879 idetape_end_request(drive, 0, 0);
883 tape->postponed_rq = NULL;
886 * If the tape is still busy, postpone our request and service
887 * the other device meanwhile.
889 stat = hwif->tp_ops->read_status(hwif);
891 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
892 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
894 if (drive->post_reset == 1) {
895 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
896 drive->post_reset = 0;
899 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
900 (stat & ATA_DSC) == 0) {
901 if (postponed_rq == NULL) {
902 tape->dsc_polling_start = jiffies;
903 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
904 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
905 } else if (time_after(jiffies, tape->dsc_timeout)) {
906 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
908 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
909 idetape_media_access_finished(drive);
912 return ide_do_reset(drive);
914 } else if (time_after(jiffies,
915 tape->dsc_polling_start +
916 IDETAPE_DSC_MA_THRESHOLD))
917 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
918 idetape_postpone_request(drive);
921 if (rq->cmd[13] & REQ_IDETAPE_READ) {
922 pc = &tape->queued_pc;
923 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
926 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
927 pc = &tape->queued_pc;
928 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
931 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
932 pc = (struct ide_atapi_pc *) rq->buffer;
933 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
934 rq->cmd[13] |= REQ_IDETAPE_PC2;
937 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
938 idetape_media_access_finished(drive);
944 return idetape_issue_pc(drive, pc);
948 * The function below uses __get_free_pages to allocate a data buffer of size
949 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
952 * It returns a pointer to the newly allocated buffer, or NULL in case of
955 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
958 struct idetape_bh *prev_bh, *bh, *merge_bh;
959 int pages = tape->pages_per_buffer;
960 unsigned int order, b_allocd;
963 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
968 order = fls(pages) - 1;
969 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
972 b_allocd = (1 << order) * PAGE_SIZE;
976 memset(bh->b_data, 0, b_allocd);
977 bh->b_reqnext = NULL;
978 bh->b_size = b_allocd;
979 atomic_set(&bh->b_count, full ? bh->b_size : 0);
982 order = fls(pages) - 1;
983 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
986 b_allocd = (1 << order) * PAGE_SIZE;
989 memset(b_data, 0, b_allocd);
991 /* newly allocated page frames below buffer header or ...*/
992 if (bh->b_data == b_data + b_allocd) {
993 bh->b_size += b_allocd;
994 bh->b_data -= b_allocd;
996 atomic_add(b_allocd, &bh->b_count);
999 /* they are above the header */
1000 if (b_data == bh->b_data + bh->b_size) {
1001 bh->b_size += b_allocd;
1003 atomic_add(b_allocd, &bh->b_count);
1007 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1009 free_pages((unsigned long) b_data, order);
1012 bh->b_reqnext = NULL;
1013 bh->b_data = b_data;
1014 bh->b_size = b_allocd;
1015 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1016 prev_bh->b_reqnext = bh;
1021 bh->b_size -= tape->excess_bh_size;
1023 atomic_sub(tape->excess_bh_size, &bh->b_count);
1026 ide_tape_kfree_buffer(tape);
1030 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1031 const char __user *buf, int n)
1033 struct idetape_bh *bh = tape->bh;
1039 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1043 count = min((unsigned int)
1044 (bh->b_size - atomic_read(&bh->b_count)),
1046 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1050 atomic_add(count, &bh->b_count);
1052 if (atomic_read(&bh->b_count) == bh->b_size) {
1055 atomic_set(&bh->b_count, 0);
1062 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1065 struct idetape_bh *bh = tape->bh;
1071 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1075 count = min(tape->b_count, n);
1076 if (copy_to_user(buf, tape->b_data, count))
1079 tape->b_data += count;
1080 tape->b_count -= count;
1082 if (!tape->b_count) {
1086 tape->b_data = bh->b_data;
1087 tape->b_count = atomic_read(&bh->b_count);
1094 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1096 struct idetape_bh *bh = tape->merge_bh;
1097 tape->bh = tape->merge_bh;
1099 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1100 atomic_set(&bh->b_count, 0);
1102 tape->b_data = bh->b_data;
1103 tape->b_count = atomic_read(&bh->b_count);
1108 * Write a filemark if write_filemark=1. Flush the device buffers without
1109 * writing a filemark otherwise.
1111 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1112 struct ide_atapi_pc *pc, int write_filemark)
1115 pc->c[0] = WRITE_FILEMARKS;
1116 pc->c[4] = write_filemark;
1117 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1120 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1122 idetape_tape_t *tape = drive->driver_data;
1123 struct gendisk *disk = tape->disk;
1124 int load_attempted = 0;
1126 /* Wait for the tape to become ready */
1127 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1129 while (time_before(jiffies, timeout)) {
1130 if (ide_do_test_unit_ready(drive, disk) == 0)
1132 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1133 || (tape->asc == 0x3A)) {
1137 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1139 /* not about to be ready */
1140 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1141 (tape->ascq == 1 || tape->ascq == 8)))
1148 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1150 struct ide_tape_obj *tape = drive->driver_data;
1151 struct ide_atapi_pc pc;
1154 idetape_create_write_filemark_cmd(drive, &pc, 0);
1155 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1158 idetape_wait_ready(drive, 60 * 5 * HZ);
1162 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1165 pc->c[0] = READ_POSITION;
1169 static int idetape_read_position(ide_drive_t *drive)
1171 idetape_tape_t *tape = drive->driver_data;
1172 struct ide_atapi_pc pc;
1175 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1177 idetape_create_read_position_cmd(&pc);
1178 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1180 position = tape->first_frame;
1184 static void idetape_create_locate_cmd(ide_drive_t *drive,
1185 struct ide_atapi_pc *pc,
1186 unsigned int block, u8 partition, int skip)
1189 pc->c[0] = POSITION_TO_ELEMENT;
1191 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1192 pc->c[8] = partition;
1193 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1196 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1198 idetape_tape_t *tape = drive->driver_data;
1200 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1203 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1204 tape->merge_bh_size = 0;
1205 if (tape->merge_bh != NULL) {
1206 ide_tape_kfree_buffer(tape);
1207 tape->merge_bh = NULL;
1210 tape->chrdev_dir = IDETAPE_DIR_NONE;
1214 * Position the tape to the requested block using the LOCATE packet command.
1215 * A READ POSITION command is then issued to check where we are positioned. Like
1216 * all higher level operations, we queue the commands at the tail of the request
1217 * queue and wait for their completion.
1219 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1220 u8 partition, int skip)
1222 idetape_tape_t *tape = drive->driver_data;
1223 struct gendisk *disk = tape->disk;
1225 struct ide_atapi_pc pc;
1227 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1228 __ide_tape_discard_merge_buffer(drive);
1229 idetape_wait_ready(drive, 60 * 5 * HZ);
1230 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1231 retval = ide_queue_pc_tail(drive, disk, &pc);
1235 idetape_create_read_position_cmd(&pc);
1236 return ide_queue_pc_tail(drive, disk, &pc);
1239 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1240 int restore_position)
1242 idetape_tape_t *tape = drive->driver_data;
1245 __ide_tape_discard_merge_buffer(drive);
1246 if (restore_position) {
1247 position = idetape_read_position(drive);
1248 seek = position > 0 ? position : 0;
1249 if (idetape_position_tape(drive, seek, 0, 0)) {
1250 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1251 " %s\n", tape->name, __func__);
1258 * Generate a read/write request for the block device interface and wait for it
1261 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1262 struct idetape_bh *bh)
1264 idetape_tape_t *tape = drive->driver_data;
1268 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1270 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1271 rq->cmd_type = REQ_TYPE_SPECIAL;
1273 rq->rq_disk = tape->disk;
1274 rq->special = (void *)bh;
1275 rq->sector = tape->first_frame;
1276 rq->nr_sectors = blocks;
1277 rq->current_nr_sectors = blocks;
1278 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1280 errors = rq->errors;
1281 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1282 blk_put_request(rq);
1284 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1288 idetape_init_merge_buffer(tape);
1289 if (errors == IDETAPE_ERROR_GENERAL)
1294 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1302 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1303 struct ide_atapi_pc *pc)
1306 pc->c[0] = REZERO_UNIT;
1307 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1310 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1315 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1318 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1322 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1324 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1327 /* Queue up a character device originated write request. */
1328 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1330 idetape_tape_t *tape = drive->driver_data;
1332 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1334 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1335 blocks, tape->merge_bh);
1338 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1340 idetape_tape_t *tape = drive->driver_data;
1342 struct idetape_bh *bh;
1344 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1345 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1346 " but we are not writing.\n");
1349 if (tape->merge_bh_size > tape->buffer_size) {
1350 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1351 tape->merge_bh_size = tape->buffer_size;
1353 if (tape->merge_bh_size) {
1354 blocks = tape->merge_bh_size / tape->blk_size;
1355 if (tape->merge_bh_size % tape->blk_size) {
1359 i = tape->blk_size - tape->merge_bh_size %
1361 bh = tape->bh->b_reqnext;
1363 atomic_set(&bh->b_count, 0);
1369 printk(KERN_INFO "ide-tape: bug,"
1373 min = min(i, (unsigned int)(bh->b_size -
1374 atomic_read(&bh->b_count)));
1375 memset(bh->b_data + atomic_read(&bh->b_count),
1377 atomic_add(min, &bh->b_count);
1382 (void) idetape_add_chrdev_write_request(drive, blocks);
1383 tape->merge_bh_size = 0;
1385 if (tape->merge_bh != NULL) {
1386 ide_tape_kfree_buffer(tape);
1387 tape->merge_bh = NULL;
1389 tape->chrdev_dir = IDETAPE_DIR_NONE;
1392 static int idetape_init_read(ide_drive_t *drive)
1394 idetape_tape_t *tape = drive->driver_data;
1397 /* Initialize read operation */
1398 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1399 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1400 ide_tape_flush_merge_buffer(drive);
1401 idetape_flush_tape_buffers(drive);
1403 if (tape->merge_bh || tape->merge_bh_size) {
1404 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1406 tape->merge_bh_size = 0;
1408 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1409 if (!tape->merge_bh)
1411 tape->chrdev_dir = IDETAPE_DIR_READ;
1414 * Issue a read 0 command to ensure that DSC handshake is
1415 * switched from completion mode to buffer available mode.
1416 * No point in issuing this if DSC overlap isn't supported, some
1417 * drives (Seagate STT3401A) will return an error.
1419 if (drive->dsc_overlap) {
1420 bytes_read = idetape_queue_rw_tail(drive,
1421 REQ_IDETAPE_READ, 0,
1423 if (bytes_read < 0) {
1424 ide_tape_kfree_buffer(tape);
1425 tape->merge_bh = NULL;
1426 tape->chrdev_dir = IDETAPE_DIR_NONE;
1435 /* called from idetape_chrdev_read() to service a chrdev read request. */
1436 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1438 idetape_tape_t *tape = drive->driver_data;
1440 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1442 /* If we are at a filemark, return a read length of 0 */
1443 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1446 idetape_init_read(drive);
1448 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1452 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1454 idetape_tape_t *tape = drive->driver_data;
1455 struct idetape_bh *bh;
1461 bh = tape->merge_bh;
1462 count = min(tape->buffer_size, bcount);
1464 blocks = count / tape->blk_size;
1466 atomic_set(&bh->b_count,
1467 min(count, (unsigned int)bh->b_size));
1468 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1469 count -= atomic_read(&bh->b_count);
1472 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1478 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1479 * currently support only one partition.
1481 static int idetape_rewind_tape(ide_drive_t *drive)
1483 struct ide_tape_obj *tape = drive->driver_data;
1484 struct gendisk *disk = tape->disk;
1486 struct ide_atapi_pc pc;
1488 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1490 idetape_create_rewind_cmd(drive, &pc);
1491 retval = ide_queue_pc_tail(drive, disk, &pc);
1495 idetape_create_read_position_cmd(&pc);
1496 retval = ide_queue_pc_tail(drive, disk, &pc);
1502 /* mtio.h compatible commands should be issued to the chrdev interface. */
1503 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1506 idetape_tape_t *tape = drive->driver_data;
1507 void __user *argp = (void __user *)arg;
1509 struct idetape_config {
1510 int dsc_rw_frequency;
1511 int dsc_media_access_frequency;
1515 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1519 if (copy_from_user(&config, argp, sizeof(config)))
1521 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1524 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1525 config.nr_stages = 1;
1526 if (copy_to_user(argp, &config, sizeof(config)))
1535 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1538 idetape_tape_t *tape = drive->driver_data;
1539 struct gendisk *disk = tape->disk;
1540 struct ide_atapi_pc pc;
1541 int retval, count = 0;
1542 int sprev = !!(tape->caps[4] & 0x20);
1546 if (MTBSF == mt_op || MTBSFM == mt_op) {
1549 mt_count = -mt_count;
1552 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1553 tape->merge_bh_size = 0;
1554 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1556 ide_tape_discard_merge_buffer(drive, 0);
1562 idetape_create_space_cmd(&pc, mt_count - count,
1563 IDETAPE_SPACE_OVER_FILEMARK);
1564 return ide_queue_pc_tail(drive, disk, &pc);
1569 retval = idetape_space_over_filemarks(drive, MTFSF,
1573 count = (MTBSFM == mt_op ? 1 : -1);
1574 return idetape_space_over_filemarks(drive, MTFSF, count);
1576 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1583 * Our character device read / write functions.
1585 * The tape is optimized to maximize throughput when it is transferring an
1586 * integral number of the "continuous transfer limit", which is a parameter of
1587 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1589 * As of version 1.3 of the driver, the character device provides an abstract
1590 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1591 * same backup/restore procedure is supported. The driver will internally
1592 * convert the requests to the recommended transfer unit, so that an unmatch
1593 * between the user's block size to the recommended size will only result in a
1594 * (slightly) increased driver overhead, but will no longer hit performance.
1595 * This is not applicable to Onstream.
1597 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1598 size_t count, loff_t *ppos)
1600 struct ide_tape_obj *tape = ide_tape_f(file);
1601 ide_drive_t *drive = tape->drive;
1602 ssize_t bytes_read, temp, actually_read = 0, rc;
1604 u16 ctl = *(u16 *)&tape->caps[12];
1606 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1608 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1609 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1610 if (count > tape->blk_size &&
1611 (count % tape->blk_size) == 0)
1612 tape->user_bs_factor = count / tape->blk_size;
1614 rc = idetape_init_read(drive);
1619 if (tape->merge_bh_size) {
1620 actually_read = min((unsigned int)(tape->merge_bh_size),
1621 (unsigned int)count);
1622 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1624 buf += actually_read;
1625 tape->merge_bh_size -= actually_read;
1626 count -= actually_read;
1628 while (count >= tape->buffer_size) {
1629 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1630 if (bytes_read <= 0)
1632 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1635 count -= bytes_read;
1636 actually_read += bytes_read;
1639 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1640 if (bytes_read <= 0)
1642 temp = min((unsigned long)count, (unsigned long)bytes_read);
1643 if (idetape_copy_stage_to_user(tape, buf, temp))
1645 actually_read += temp;
1646 tape->merge_bh_size = bytes_read-temp;
1649 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1650 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1652 idetape_space_over_filemarks(drive, MTFSF, 1);
1656 return ret ? ret : actually_read;
1659 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1660 size_t count, loff_t *ppos)
1662 struct ide_tape_obj *tape = ide_tape_f(file);
1663 ide_drive_t *drive = tape->drive;
1664 ssize_t actually_written = 0;
1666 u16 ctl = *(u16 *)&tape->caps[12];
1668 /* The drive is write protected. */
1669 if (tape->write_prot)
1672 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1674 /* Initialize write operation */
1675 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1676 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1677 ide_tape_discard_merge_buffer(drive, 1);
1678 if (tape->merge_bh || tape->merge_bh_size) {
1679 printk(KERN_ERR "ide-tape: merge_bh_size "
1680 "should be 0 now\n");
1681 tape->merge_bh_size = 0;
1683 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1684 if (!tape->merge_bh)
1686 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1687 idetape_init_merge_buffer(tape);
1690 * Issue a write 0 command to ensure that DSC handshake is
1691 * switched from completion mode to buffer available mode. No
1692 * point in issuing this if DSC overlap isn't supported, some
1693 * drives (Seagate STT3401A) will return an error.
1695 if (drive->dsc_overlap) {
1696 ssize_t retval = idetape_queue_rw_tail(drive,
1697 REQ_IDETAPE_WRITE, 0,
1700 ide_tape_kfree_buffer(tape);
1701 tape->merge_bh = NULL;
1702 tape->chrdev_dir = IDETAPE_DIR_NONE;
1709 if (tape->merge_bh_size) {
1710 if (tape->merge_bh_size >= tape->buffer_size) {
1711 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1712 tape->merge_bh_size = 0;
1714 actually_written = min((unsigned int)
1715 (tape->buffer_size - tape->merge_bh_size),
1716 (unsigned int)count);
1717 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1719 buf += actually_written;
1720 tape->merge_bh_size += actually_written;
1721 count -= actually_written;
1723 if (tape->merge_bh_size == tape->buffer_size) {
1725 tape->merge_bh_size = 0;
1726 retval = idetape_add_chrdev_write_request(drive, ctl);
1731 while (count >= tape->buffer_size) {
1733 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1735 buf += tape->buffer_size;
1736 count -= tape->buffer_size;
1737 retval = idetape_add_chrdev_write_request(drive, ctl);
1738 actually_written += tape->buffer_size;
1743 actually_written += count;
1744 if (idetape_copy_stage_from_user(tape, buf, count))
1746 tape->merge_bh_size += count;
1748 return ret ? ret : actually_written;
1751 static int idetape_write_filemark(ide_drive_t *drive)
1753 struct ide_tape_obj *tape = drive->driver_data;
1754 struct ide_atapi_pc pc;
1756 /* Write a filemark */
1757 idetape_create_write_filemark_cmd(drive, &pc, 1);
1758 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1759 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1766 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1769 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1770 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1771 * usually not supported.
1773 * The following commands are currently not supported:
1775 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1776 * MT_ST_WRITE_THRESHOLD.
1778 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1780 idetape_tape_t *tape = drive->driver_data;
1781 struct gendisk *disk = tape->disk;
1782 struct ide_atapi_pc pc;
1785 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1795 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1802 if (tape->write_prot)
1804 ide_tape_discard_merge_buffer(drive, 1);
1805 for (i = 0; i < mt_count; i++) {
1806 retval = idetape_write_filemark(drive);
1812 ide_tape_discard_merge_buffer(drive, 0);
1813 if (idetape_rewind_tape(drive))
1817 ide_tape_discard_merge_buffer(drive, 0);
1818 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1822 * If door is locked, attempt to unlock before
1823 * attempting to eject.
1825 if (tape->door_locked) {
1826 if (!ide_set_media_lock(drive, disk, 0))
1827 tape->door_locked = DOOR_UNLOCKED;
1829 ide_tape_discard_merge_buffer(drive, 0);
1830 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1832 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1835 ide_tape_discard_merge_buffer(drive, 0);
1836 return idetape_flush_tape_buffers(drive);
1838 ide_tape_discard_merge_buffer(drive, 0);
1839 return ide_do_start_stop(drive, disk,
1840 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1842 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1843 return ide_queue_pc_tail(drive, disk, &pc);
1845 (void)idetape_rewind_tape(drive);
1846 idetape_create_erase_cmd(&pc);
1847 return ide_queue_pc_tail(drive, disk, &pc);
1850 if (mt_count < tape->blk_size ||
1851 mt_count % tape->blk_size)
1853 tape->user_bs_factor = mt_count / tape->blk_size;
1854 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1856 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1859 ide_tape_discard_merge_buffer(drive, 0);
1860 return idetape_position_tape(drive,
1861 mt_count * tape->user_bs_factor, tape->partition, 0);
1863 ide_tape_discard_merge_buffer(drive, 0);
1864 return idetape_position_tape(drive, 0, mt_count, 0);
1868 retval = ide_set_media_lock(drive, disk, 1);
1871 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1874 retval = ide_set_media_lock(drive, disk, 0);
1877 tape->door_locked = DOOR_UNLOCKED;
1880 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1887 * Our character device ioctls. General mtio.h magnetic io commands are
1888 * supported here, and not in the corresponding block interface. Our own
1889 * ide-tape ioctls are supported on both interfaces.
1891 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1892 unsigned int cmd, unsigned long arg)
1894 struct ide_tape_obj *tape = ide_tape_f(file);
1895 ide_drive_t *drive = tape->drive;
1899 int block_offset = 0, position = tape->first_frame;
1900 void __user *argp = (void __user *)arg;
1902 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1904 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1905 ide_tape_flush_merge_buffer(drive);
1906 idetape_flush_tape_buffers(drive);
1908 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1909 block_offset = tape->merge_bh_size /
1910 (tape->blk_size * tape->user_bs_factor);
1911 position = idetape_read_position(drive);
1917 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1919 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1921 memset(&mtget, 0, sizeof(struct mtget));
1922 mtget.mt_type = MT_ISSCSI2;
1923 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1925 ((tape->blk_size * tape->user_bs_factor)
1926 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1928 if (tape->drv_write_prot)
1929 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1931 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1935 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1936 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1940 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1941 ide_tape_discard_merge_buffer(drive, 1);
1942 return idetape_blkdev_ioctl(drive, cmd, arg);
1947 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1948 * block size with the reported value.
1950 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1952 idetape_tape_t *tape = drive->driver_data;
1953 struct ide_atapi_pc pc;
1955 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1956 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1957 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1958 if (tape->blk_size == 0) {
1959 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1960 "block size, assuming 32k\n");
1961 tape->blk_size = 32768;
1965 tape->blk_size = (pc.buf[4 + 5] << 16) +
1966 (pc.buf[4 + 6] << 8) +
1968 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1971 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1973 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1975 idetape_tape_t *tape;
1978 if (i >= MAX_HWIFS * MAX_DRIVES)
1982 tape = ide_tape_chrdev_get(i);
1988 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1991 * We really want to do nonseekable_open(inode, filp); here, but some
1992 * versions of tar incorrectly call lseek on tapes and bail out if that
1993 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1995 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1997 drive = tape->drive;
1999 filp->private_data = tape;
2001 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
2006 retval = idetape_wait_ready(drive, 60 * HZ);
2008 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2009 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2013 idetape_read_position(drive);
2014 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2015 (void)idetape_rewind_tape(drive);
2017 /* Read block size and write protect status from drive. */
2018 ide_tape_get_bsize_from_bdesc(drive);
2020 /* Set write protect flag if device is opened as read-only. */
2021 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2022 tape->write_prot = 1;
2024 tape->write_prot = tape->drv_write_prot;
2026 /* Make sure drive isn't write protected if user wants to write. */
2027 if (tape->write_prot) {
2028 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2029 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2030 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2036 /* Lock the tape drive door so user can't eject. */
2037 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2038 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2039 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2040 tape->door_locked = DOOR_LOCKED;
2052 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2054 idetape_tape_t *tape = drive->driver_data;
2056 ide_tape_flush_merge_buffer(drive);
2057 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2058 if (tape->merge_bh != NULL) {
2059 idetape_pad_zeros(drive, tape->blk_size *
2060 (tape->user_bs_factor - 1));
2061 ide_tape_kfree_buffer(tape);
2062 tape->merge_bh = NULL;
2064 idetape_write_filemark(drive);
2065 idetape_flush_tape_buffers(drive);
2066 idetape_flush_tape_buffers(drive);
2069 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2071 struct ide_tape_obj *tape = ide_tape_f(filp);
2072 ide_drive_t *drive = tape->drive;
2073 unsigned int minor = iminor(inode);
2076 tape = drive->driver_data;
2078 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2080 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2081 idetape_write_release(drive, minor);
2082 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2084 ide_tape_discard_merge_buffer(drive, 1);
2087 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2088 (void) idetape_rewind_tape(drive);
2089 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2090 if (tape->door_locked == DOOR_LOCKED) {
2091 if (!ide_set_media_lock(drive, tape->disk, 0))
2092 tape->door_locked = DOOR_UNLOCKED;
2095 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2101 static void idetape_get_inquiry_results(ide_drive_t *drive)
2103 idetape_tape_t *tape = drive->driver_data;
2104 struct ide_atapi_pc pc;
2105 char fw_rev[4], vendor_id[8], product_id[16];
2107 idetape_create_inquiry_cmd(&pc);
2108 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2109 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2113 memcpy(vendor_id, &pc.buf[8], 8);
2114 memcpy(product_id, &pc.buf[16], 16);
2115 memcpy(fw_rev, &pc.buf[32], 4);
2117 ide_fixstring(vendor_id, 8, 0);
2118 ide_fixstring(product_id, 16, 0);
2119 ide_fixstring(fw_rev, 4, 0);
2121 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2122 drive->name, tape->name, vendor_id, product_id, fw_rev);
2126 * Ask the tape about its various parameters. In particular, we will adjust our
2127 * data transfer buffer size to the recommended value as returned by the tape.
2129 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2131 idetape_tape_t *tape = drive->driver_data;
2132 struct ide_atapi_pc pc;
2134 u8 speed, max_speed;
2136 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2137 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2138 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2139 " some default values\n");
2140 tape->blk_size = 512;
2141 put_unaligned(52, (u16 *)&tape->caps[12]);
2142 put_unaligned(540, (u16 *)&tape->caps[14]);
2143 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2146 caps = pc.buf + 4 + pc.buf[3];
2148 /* convert to host order and save for later use */
2149 speed = be16_to_cpup((__be16 *)&caps[14]);
2150 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2152 *(u16 *)&caps[8] = max_speed;
2153 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2154 *(u16 *)&caps[14] = speed;
2155 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2158 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2159 "(assuming 650KB/sec)\n", drive->name);
2160 *(u16 *)&caps[14] = 650;
2163 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2164 "(assuming 650KB/sec)\n", drive->name);
2165 *(u16 *)&caps[8] = 650;
2168 memcpy(&tape->caps, caps, 20);
2170 /* device lacks locking support according to capabilities page */
2171 if ((caps[6] & 1) == 0)
2172 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2175 tape->blk_size = 512;
2176 else if (caps[7] & 0x04)
2177 tape->blk_size = 1024;
2180 #ifdef CONFIG_IDE_PROC_FS
2181 #define ide_tape_devset_get(name, field) \
2182 static int get_##name(ide_drive_t *drive) \
2184 idetape_tape_t *tape = drive->driver_data; \
2185 return tape->field; \
2188 #define ide_tape_devset_set(name, field) \
2189 static int set_##name(ide_drive_t *drive, int arg) \
2191 idetape_tape_t *tape = drive->driver_data; \
2192 tape->field = arg; \
2196 #define ide_tape_devset_rw_field(_name, _field) \
2197 ide_tape_devset_get(_name, _field) \
2198 ide_tape_devset_set(_name, _field) \
2199 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2201 #define ide_tape_devset_r_field(_name, _field) \
2202 ide_tape_devset_get(_name, _field) \
2203 IDE_DEVSET(_name, 0, get_##_name, NULL)
2205 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2206 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2207 static int divf_buffer(ide_drive_t *drive) { return 2; }
2208 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2210 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2212 ide_tape_devset_rw_field(debug_mask, debug_mask);
2213 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2215 ide_tape_devset_r_field(avg_speed, avg_speed);
2216 ide_tape_devset_r_field(speed, caps[14]);
2217 ide_tape_devset_r_field(buffer, caps[16]);
2218 ide_tape_devset_r_field(buffer_size, buffer_size);
2220 static const struct ide_proc_devset idetape_settings[] = {
2221 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2222 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2223 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2224 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2225 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2226 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2227 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2228 mulf_tdsc, divf_tdsc),
2234 * The function below is called to:
2236 * 1. Initialize our various state variables.
2237 * 2. Ask the tape for its capabilities.
2238 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2239 * is chosen based on the recommendation which we received in step 2.
2241 * Note that at this point ide.c already assigned us an irq, so that we can
2242 * queue requests here and wait for their completion.
2244 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2250 u16 *ctl = (u16 *)&tape->caps[12];
2252 drive->pc_callback = ide_tape_callback;
2254 spin_lock_init(&tape->lock);
2255 drive->dsc_overlap = 1;
2256 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2257 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2259 drive->dsc_overlap = 0;
2261 /* Seagate Travan drives do not support DSC overlap. */
2262 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2263 drive->dsc_overlap = 0;
2264 tape->minor = minor;
2265 tape->name[0] = 'h';
2266 tape->name[1] = 't';
2267 tape->name[2] = '0' + minor;
2268 tape->chrdev_dir = IDETAPE_DIR_NONE;
2270 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2272 /* Command packet DRQ type */
2273 if (((gcw[0] & 0x60) >> 5) == 1)
2274 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2276 idetape_get_inquiry_results(drive);
2277 idetape_get_mode_sense_results(drive);
2278 ide_tape_get_bsize_from_bdesc(drive);
2279 tape->user_bs_factor = 1;
2280 tape->buffer_size = *ctl * tape->blk_size;
2281 while (tape->buffer_size > 0xffff) {
2282 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2284 tape->buffer_size = *ctl * tape->blk_size;
2286 buffer_size = tape->buffer_size;
2287 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2288 if (buffer_size % PAGE_SIZE) {
2289 tape->pages_per_buffer++;
2290 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2293 /* select the "best" DSC read/write polling freq */
2294 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2296 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2299 * Ensure that the number we got makes sense; limit it within
2300 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2302 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2303 IDETAPE_DSC_RW_MAX);
2304 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2306 drive->name, tape->name, *(u16 *)&tape->caps[14],
2307 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2308 tape->buffer_size / 1024,
2309 tape->best_dsc_rw_freq * 1000 / HZ,
2310 drive->using_dma ? ", DMA":"");
2312 ide_proc_register_driver(drive, tape->driver);
2315 static void ide_tape_remove(ide_drive_t *drive)
2317 idetape_tape_t *tape = drive->driver_data;
2319 ide_proc_unregister_driver(drive, tape->driver);
2321 ide_unregister_region(tape->disk);
2326 static void ide_tape_release(struct kref *kref)
2328 struct ide_tape_obj *tape = to_ide_tape(kref);
2329 ide_drive_t *drive = tape->drive;
2330 struct gendisk *g = tape->disk;
2332 BUG_ON(tape->merge_bh_size);
2334 drive->dsc_overlap = 0;
2335 drive->driver_data = NULL;
2336 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2337 device_destroy(idetape_sysfs_class,
2338 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2339 idetape_devs[tape->minor] = NULL;
2340 g->private_data = NULL;
2345 #ifdef CONFIG_IDE_PROC_FS
2346 static int proc_idetape_read_name
2347 (char *page, char **start, off_t off, int count, int *eof, void *data)
2349 ide_drive_t *drive = (ide_drive_t *) data;
2350 idetape_tape_t *tape = drive->driver_data;
2354 len = sprintf(out, "%s\n", tape->name);
2355 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2358 static ide_proc_entry_t idetape_proc[] = {
2359 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2360 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2361 { NULL, 0, NULL, NULL }
2365 static int ide_tape_probe(ide_drive_t *);
2367 static ide_driver_t idetape_driver = {
2369 .owner = THIS_MODULE,
2371 .bus = &ide_bus_type,
2373 .probe = ide_tape_probe,
2374 .remove = ide_tape_remove,
2375 .version = IDETAPE_VERSION,
2377 .do_request = idetape_do_request,
2378 .end_request = idetape_end_request,
2379 .error = __ide_error,
2380 #ifdef CONFIG_IDE_PROC_FS
2381 .proc = idetape_proc,
2382 .settings = idetape_settings,
2386 /* Our character device supporting functions, passed to register_chrdev. */
2387 static const struct file_operations idetape_fops = {
2388 .owner = THIS_MODULE,
2389 .read = idetape_chrdev_read,
2390 .write = idetape_chrdev_write,
2391 .ioctl = idetape_chrdev_ioctl,
2392 .open = idetape_chrdev_open,
2393 .release = idetape_chrdev_release,
2396 static int idetape_open(struct inode *inode, struct file *filp)
2398 struct gendisk *disk = inode->i_bdev->bd_disk;
2399 struct ide_tape_obj *tape;
2401 tape = ide_tape_get(disk);
2408 static int idetape_release(struct inode *inode, struct file *filp)
2410 struct gendisk *disk = inode->i_bdev->bd_disk;
2411 struct ide_tape_obj *tape = ide_tape_g(disk);
2418 static int idetape_ioctl(struct inode *inode, struct file *file,
2419 unsigned int cmd, unsigned long arg)
2421 struct block_device *bdev = inode->i_bdev;
2422 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2423 ide_drive_t *drive = tape->drive;
2424 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2426 err = idetape_blkdev_ioctl(drive, cmd, arg);
2430 static struct block_device_operations idetape_block_ops = {
2431 .owner = THIS_MODULE,
2432 .open = idetape_open,
2433 .release = idetape_release,
2434 .ioctl = idetape_ioctl,
2437 static int ide_tape_probe(ide_drive_t *drive)
2439 idetape_tape_t *tape;
2443 if (!strstr("ide-tape", drive->driver_req))
2446 if (drive->media != ide_tape)
2449 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2450 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2451 " the driver\n", drive->name);
2454 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2456 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2461 g = alloc_disk(1 << PARTN_BITS);
2465 ide_init_disk(g, drive);
2467 kref_init(&tape->kref);
2469 tape->drive = drive;
2470 tape->driver = &idetape_driver;
2473 g->private_data = &tape->driver;
2475 drive->driver_data = tape;
2477 mutex_lock(&idetape_ref_mutex);
2478 for (minor = 0; idetape_devs[minor]; minor++)
2480 idetape_devs[minor] = tape;
2481 mutex_unlock(&idetape_ref_mutex);
2483 idetape_setup(drive, tape, minor);
2485 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2486 MKDEV(IDETAPE_MAJOR, minor), NULL,
2488 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2489 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2492 g->fops = &idetape_block_ops;
2493 ide_register_region(g);
2503 static void __exit idetape_exit(void)
2505 driver_unregister(&idetape_driver.gen_driver);
2506 class_destroy(idetape_sysfs_class);
2507 unregister_chrdev(IDETAPE_MAJOR, "ht");
2510 static int __init idetape_init(void)
2513 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2514 if (IS_ERR(idetape_sysfs_class)) {
2515 idetape_sysfs_class = NULL;
2516 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2521 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2522 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2525 goto out_free_class;
2528 error = driver_register(&idetape_driver.gen_driver);
2530 goto out_free_driver;
2535 driver_unregister(&idetape_driver.gen_driver);
2537 class_destroy(idetape_sysfs_class);
2542 MODULE_ALIAS("ide:*m-tape*");
2543 module_init(idetape_init);
2544 module_exit(idetape_exit);
2545 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2546 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2547 MODULE_LICENSE("GPL");