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 struct ide_driver *driver;
171 struct gendisk *disk;
174 /* used by REQ_IDETAPE_{READ,WRITE} requests */
175 struct ide_atapi_pc queued_pc;
178 * DSC polling variables.
180 * While polling for DSC we use postponed_rq to postpone the current
181 * request so that ide.c will be able to service pending requests on the
182 * other device. Note that at most we will have only one DSC (usually
183 * data transfer) request in the device request queue.
185 struct request *postponed_rq;
186 /* The time in which we started polling for DSC */
187 unsigned long dsc_polling_start;
188 /* Timer used to poll for dsc */
189 struct timer_list dsc_timer;
190 /* Read/Write dsc polling frequency */
191 unsigned long best_dsc_rw_freq;
192 unsigned long dsc_poll_freq;
193 unsigned long dsc_timeout;
195 /* Read position information */
198 unsigned int first_frame;
200 /* Last error information */
201 u8 sense_key, asc, ascq;
203 /* Character device operation */
207 /* Current character device data transfer direction */
210 /* tape block size, usually 512 or 1024 bytes */
211 unsigned short blk_size;
214 /* Copy of the tape's Capabilities and Mechanical Page */
218 * Active data transfer request parameters.
220 * At most, there is only one ide-tape originated data transfer request
221 * in the device request queue. This allows ide.c to easily service
222 * requests from the other device when we postpone our active request.
225 /* Data buffer size chosen based on the tape's recommendation */
228 struct idetape_bh *merge_bh;
229 /* size of the merge buffer */
231 /* pointer to current buffer head within the merge buffer */
232 struct idetape_bh *bh;
236 int pages_per_buffer;
237 /* Wasted space in each stage */
240 /* Measures average tape speed */
241 unsigned long avg_time;
245 /* the door is currently locked */
247 /* the tape hardware is write protected */
249 /* the tape is write protected (hardware or opened as read-only) */
255 static DEFINE_MUTEX(idetape_ref_mutex);
257 static struct class *idetape_sysfs_class;
259 static void ide_tape_release(struct device *);
261 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
263 struct ide_tape_obj *tape = NULL;
265 mutex_lock(&idetape_ref_mutex);
266 tape = ide_drv_g(disk, ide_tape_obj);
268 if (ide_device_get(tape->drive))
271 get_device(&tape->dev);
273 mutex_unlock(&idetape_ref_mutex);
277 static void ide_tape_put(struct ide_tape_obj *tape)
279 ide_drive_t *drive = tape->drive;
281 mutex_lock(&idetape_ref_mutex);
282 put_device(&tape->dev);
283 ide_device_put(drive);
284 mutex_unlock(&idetape_ref_mutex);
288 * The variables below are used for the character device interface. Additional
289 * state variables are defined in our ide_drive_t structure.
291 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
293 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
295 struct ide_tape_obj *tape = NULL;
297 mutex_lock(&idetape_ref_mutex);
298 tape = idetape_devs[i];
300 get_device(&tape->dev);
301 mutex_unlock(&idetape_ref_mutex);
305 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
308 struct idetape_bh *bh = pc->bh;
313 printk(KERN_ERR "ide-tape: bh == NULL in "
314 "idetape_input_buffers\n");
315 ide_pad_transfer(drive, 0, bcount);
319 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
321 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
322 atomic_read(&bh->b_count), count);
324 atomic_add(count, &bh->b_count);
325 if (atomic_read(&bh->b_count) == bh->b_size) {
328 atomic_set(&bh->b_count, 0);
334 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
337 struct idetape_bh *bh = pc->bh;
342 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
346 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
347 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
350 pc->b_count -= count;
355 pc->b_data = bh->b_data;
356 pc->b_count = atomic_read(&bh->b_count);
362 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
364 struct idetape_bh *bh = pc->bh;
366 unsigned int bcount = pc->xferred;
368 if (pc->flags & PC_FLAG_WRITING)
372 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
376 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
377 atomic_set(&bh->b_count, count);
378 if (atomic_read(&bh->b_count) == bh->b_size)
386 * called on each failed packet command retry to analyze the request sense. We
387 * currently do not utilize this information.
389 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
391 idetape_tape_t *tape = drive->driver_data;
392 struct ide_atapi_pc *pc = drive->failed_pc;
394 tape->sense_key = sense[2] & 0xF;
395 tape->asc = sense[12];
396 tape->ascq = sense[13];
398 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
399 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
401 /* Correct pc->xferred by asking the tape. */
402 if (pc->flags & PC_FLAG_DMA_ERROR) {
403 pc->xferred = pc->req_xfer -
405 get_unaligned_be32(&sense[3]);
406 idetape_update_buffers(drive, pc);
410 * If error was the result of a zero-length read or write command,
411 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
412 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
414 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
416 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
417 if (tape->sense_key == 5) {
418 /* don't report an error, everything's ok */
420 /* don't retry read/write */
421 pc->flags |= PC_FLAG_ABORT;
424 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
425 pc->error = IDETAPE_ERROR_FILEMARK;
426 pc->flags |= PC_FLAG_ABORT;
428 if (pc->c[0] == WRITE_6) {
429 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
430 && tape->asc == 0x0 && tape->ascq == 0x2)) {
431 pc->error = IDETAPE_ERROR_EOD;
432 pc->flags |= PC_FLAG_ABORT;
435 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
436 if (tape->sense_key == 8) {
437 pc->error = IDETAPE_ERROR_EOD;
438 pc->flags |= PC_FLAG_ABORT;
440 if (!(pc->flags & PC_FLAG_ABORT) &&
442 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
446 /* Free data buffers completely. */
447 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
449 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
452 u32 size = bh->b_size;
455 unsigned int order = fls(size >> PAGE_SHIFT)-1;
458 free_pages((unsigned long)bh->b_data, order);
461 bh->b_data += (1 << order) * PAGE_SIZE;
469 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
471 struct request *rq = drive->hwif->rq;
474 debug_log(DBG_PROCS, "Enter %s\n", __func__);
477 case 0: error = IDETAPE_ERROR_GENERAL; break;
478 case 1: error = 0; break;
479 default: error = uptodate;
483 drive->failed_pc = NULL;
485 if (!blk_special_request(rq)) {
486 ide_end_request(drive, uptodate, nr_sects);
490 ide_complete_rq(drive, 0);
495 static void ide_tape_handle_dsc(ide_drive_t *);
497 static void ide_tape_callback(ide_drive_t *drive, int dsc)
499 idetape_tape_t *tape = drive->driver_data;
500 struct ide_atapi_pc *pc = drive->pc;
501 int uptodate = pc->error ? 0 : 1;
503 debug_log(DBG_PROCS, "Enter %s\n", __func__);
506 ide_tape_handle_dsc(drive);
508 if (drive->failed_pc == pc)
509 drive->failed_pc = NULL;
511 if (pc->c[0] == REQUEST_SENSE) {
513 idetape_analyze_error(drive, pc->buf);
515 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
516 "itself - Aborting request!\n");
517 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
518 struct request *rq = drive->hwif->rq;
519 int blocks = pc->xferred / tape->blk_size;
521 tape->avg_size += blocks * tape->blk_size;
523 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
524 tape->avg_speed = tape->avg_size * HZ /
525 (jiffies - tape->avg_time) / 1024;
527 tape->avg_time = jiffies;
530 tape->first_frame += blocks;
531 rq->current_nr_sectors -= blocks;
534 uptodate = pc->error;
535 } else if (pc->c[0] == READ_POSITION && uptodate) {
536 u8 *readpos = pc->buf;
538 debug_log(DBG_SENSE, "BOP - %s\n",
539 (readpos[0] & 0x80) ? "Yes" : "No");
540 debug_log(DBG_SENSE, "EOP - %s\n",
541 (readpos[0] & 0x40) ? "Yes" : "No");
543 if (readpos[0] & 0x4) {
544 printk(KERN_INFO "ide-tape: Block location is unknown"
546 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
549 debug_log(DBG_SENSE, "Block Location - %u\n",
550 be32_to_cpup((__be32 *)&readpos[4]));
552 tape->partition = readpos[1];
553 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
554 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
558 idetape_end_request(drive, uptodate, 0);
562 * Postpone the current request so that ide.c will be able to service requests
563 * from another device on the same port while we are polling for DSC.
565 static void idetape_postpone_request(ide_drive_t *drive)
567 idetape_tape_t *tape = drive->driver_data;
569 debug_log(DBG_PROCS, "Enter %s\n", __func__);
571 tape->postponed_rq = drive->hwif->rq;
573 ide_stall_queue(drive, tape->dsc_poll_freq);
576 static void ide_tape_handle_dsc(ide_drive_t *drive)
578 idetape_tape_t *tape = drive->driver_data;
580 /* Media access command */
581 tape->dsc_polling_start = jiffies;
582 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
583 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
584 /* Allow ide.c to handle other requests */
585 idetape_postpone_request(drive);
588 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
589 unsigned int bcount, int write)
592 idetape_output_buffers(drive, pc, bcount);
594 idetape_input_buffers(drive, pc, bcount);
600 * Packet Command Interface
602 * The current Packet Command is available in drive->pc, and will not change
603 * until we finish handling it. Each packet command is associated with a
604 * callback function that will be called when the command is finished.
606 * The handling will be done in three stages:
608 * 1. idetape_issue_pc will send the packet command to the drive, and will set
609 * the interrupt handler to ide_pc_intr.
611 * 2. On each interrupt, ide_pc_intr will be called. This step will be
612 * repeated until the device signals us that no more interrupts will be issued.
614 * 3. ATAPI Tape media access commands have immediate status with a delayed
615 * process. In case of a successful initiation of a media access packet command,
616 * the DSC bit will be set when the actual execution of the command is finished.
617 * Since the tape drive will not issue an interrupt, we have to poll for this
618 * event. In this case, we define the request as "low priority request" by
619 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
622 * ide.c will then give higher priority to requests which originate from the
623 * other device, until will change rq_status to RQ_ACTIVE.
625 * 4. When the packet command is finished, it will be checked for errors.
627 * 5. In case an error was found, we queue a request sense packet command in
628 * front of the request queue and retry the operation up to
629 * IDETAPE_MAX_PC_RETRIES times.
631 * 6. In case no error was found, or we decided to give up and not to retry
632 * again, the callback function will be called and then we will handle the next
636 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
637 struct ide_atapi_pc *pc)
639 idetape_tape_t *tape = drive->driver_data;
641 if (drive->pc->c[0] == REQUEST_SENSE &&
642 pc->c[0] == REQUEST_SENSE) {
643 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
644 "Two request sense in serial were issued\n");
647 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
648 drive->failed_pc = pc;
650 /* Set the current packet command */
653 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
654 (pc->flags & PC_FLAG_ABORT)) {
656 * We will "abort" retrying a packet command in case legitimate
657 * error code was received (crossing a filemark, or end of the
658 * media, for example).
660 if (!(pc->flags & PC_FLAG_ABORT)) {
661 if (!(pc->c[0] == TEST_UNIT_READY &&
662 tape->sense_key == 2 && tape->asc == 4 &&
663 (tape->ascq == 1 || tape->ascq == 8))) {
664 printk(KERN_ERR "ide-tape: %s: I/O error, "
665 "pc = %2x, key = %2x, "
666 "asc = %2x, ascq = %2x\n",
667 tape->name, pc->c[0],
668 tape->sense_key, tape->asc,
672 pc->error = IDETAPE_ERROR_GENERAL;
674 drive->failed_pc = NULL;
675 drive->pc_callback(drive, 0);
678 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
682 return ide_issue_pc(drive);
685 /* A mode sense command is used to "sense" tape parameters. */
686 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
689 pc->c[0] = MODE_SENSE;
690 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
691 /* DBD = 1 - Don't return block descriptors */
693 pc->c[2] = page_code;
695 * Changed pc->c[3] to 0 (255 will at best return unused info).
697 * For SCSI this byte is defined as subpage instead of high byte
698 * of length and some IDE drives seem to interpret it this way
699 * and return an error when 255 is used.
702 /* We will just discard data in that case */
704 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
706 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
712 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
714 ide_hwif_t *hwif = drive->hwif;
715 idetape_tape_t *tape = drive->driver_data;
716 struct ide_atapi_pc *pc = drive->pc;
719 stat = hwif->tp_ops->read_status(hwif);
721 if (stat & ATA_DSC) {
722 if (stat & ATA_ERR) {
724 if (pc->c[0] != TEST_UNIT_READY)
725 printk(KERN_ERR "ide-tape: %s: I/O error, ",
727 /* Retry operation */
728 ide_retry_pc(drive, tape->disk);
733 pc->error = IDETAPE_ERROR_GENERAL;
734 drive->failed_pc = NULL;
736 drive->pc_callback(drive, 0);
740 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
741 struct ide_atapi_pc *pc, struct request *rq,
744 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
745 unsigned int length = rq->current_nr_sectors;
748 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
752 pc->buf_size = length * tape->blk_size;
753 pc->req_xfer = pc->buf_size;
754 if (pc->req_xfer == tape->buffer_size)
755 pc->flags |= PC_FLAG_DMA_OK;
757 if (opcode == READ_6) {
759 atomic_set(&bh->b_count, 0);
760 } else if (opcode == WRITE_6) {
762 pc->flags |= PC_FLAG_WRITING;
763 pc->b_data = bh->b_data;
764 pc->b_count = atomic_read(&bh->b_count);
767 memcpy(rq->cmd, pc->c, 12);
770 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
771 struct request *rq, sector_t block)
773 ide_hwif_t *hwif = drive->hwif;
774 idetape_tape_t *tape = drive->driver_data;
775 struct ide_atapi_pc *pc = NULL;
776 struct request *postponed_rq = tape->postponed_rq;
779 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
780 " current_nr_sectors: %u\n",
781 (unsigned long long)rq->sector, rq->nr_sectors,
782 rq->current_nr_sectors);
784 if (!blk_special_request(rq)) {
785 /* We do not support buffer cache originated requests. */
786 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
787 "request queue (%d)\n", drive->name, rq->cmd_type);
788 ide_end_request(drive, 0, 0);
792 /* Retry a failed packet command */
793 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
794 pc = drive->failed_pc;
798 if (postponed_rq != NULL)
799 if (rq != postponed_rq) {
800 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
801 "Two DSC requests were queued\n");
802 idetape_end_request(drive, 0, 0);
806 tape->postponed_rq = NULL;
809 * If the tape is still busy, postpone our request and service
810 * the other device meanwhile.
812 stat = hwif->tp_ops->read_status(hwif);
814 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
815 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
816 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
818 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
819 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
820 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
823 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
824 (stat & ATA_DSC) == 0) {
825 if (postponed_rq == NULL) {
826 tape->dsc_polling_start = jiffies;
827 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
828 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
829 } else if (time_after(jiffies, tape->dsc_timeout)) {
830 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
832 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
833 idetape_media_access_finished(drive);
836 return ide_do_reset(drive);
838 } else if (time_after(jiffies,
839 tape->dsc_polling_start +
840 IDETAPE_DSC_MA_THRESHOLD))
841 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
842 idetape_postpone_request(drive);
845 if (rq->cmd[13] & REQ_IDETAPE_READ) {
846 pc = &tape->queued_pc;
847 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
850 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
851 pc = &tape->queued_pc;
852 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
855 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
856 pc = (struct ide_atapi_pc *) rq->buffer;
857 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
858 rq->cmd[13] |= REQ_IDETAPE_PC2;
861 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
862 idetape_media_access_finished(drive);
868 return idetape_issue_pc(drive, pc);
872 * The function below uses __get_free_pages to allocate a data buffer of size
873 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
876 * It returns a pointer to the newly allocated buffer, or NULL in case of
879 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
882 struct idetape_bh *prev_bh, *bh, *merge_bh;
883 int pages = tape->pages_per_buffer;
884 unsigned int order, b_allocd;
887 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
892 order = fls(pages) - 1;
893 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
896 b_allocd = (1 << order) * PAGE_SIZE;
900 memset(bh->b_data, 0, b_allocd);
901 bh->b_reqnext = NULL;
902 bh->b_size = b_allocd;
903 atomic_set(&bh->b_count, full ? bh->b_size : 0);
906 order = fls(pages) - 1;
907 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
910 b_allocd = (1 << order) * PAGE_SIZE;
913 memset(b_data, 0, b_allocd);
915 /* newly allocated page frames below buffer header or ...*/
916 if (bh->b_data == b_data + b_allocd) {
917 bh->b_size += b_allocd;
918 bh->b_data -= b_allocd;
920 atomic_add(b_allocd, &bh->b_count);
923 /* they are above the header */
924 if (b_data == bh->b_data + bh->b_size) {
925 bh->b_size += b_allocd;
927 atomic_add(b_allocd, &bh->b_count);
931 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
933 free_pages((unsigned long) b_data, order);
936 bh->b_reqnext = NULL;
938 bh->b_size = b_allocd;
939 atomic_set(&bh->b_count, full ? bh->b_size : 0);
940 prev_bh->b_reqnext = bh;
945 bh->b_size -= tape->excess_bh_size;
947 atomic_sub(tape->excess_bh_size, &bh->b_count);
950 ide_tape_kfree_buffer(tape);
954 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
955 const char __user *buf, int n)
957 struct idetape_bh *bh = tape->bh;
963 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
967 count = min((unsigned int)
968 (bh->b_size - atomic_read(&bh->b_count)),
970 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
974 atomic_add(count, &bh->b_count);
976 if (atomic_read(&bh->b_count) == bh->b_size) {
979 atomic_set(&bh->b_count, 0);
986 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
989 struct idetape_bh *bh = tape->bh;
995 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
999 count = min(tape->b_count, n);
1000 if (copy_to_user(buf, tape->b_data, count))
1003 tape->b_data += count;
1004 tape->b_count -= count;
1006 if (!tape->b_count) {
1010 tape->b_data = bh->b_data;
1011 tape->b_count = atomic_read(&bh->b_count);
1018 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1020 struct idetape_bh *bh = tape->merge_bh;
1021 tape->bh = tape->merge_bh;
1023 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1024 atomic_set(&bh->b_count, 0);
1026 tape->b_data = bh->b_data;
1027 tape->b_count = atomic_read(&bh->b_count);
1032 * Write a filemark if write_filemark=1. Flush the device buffers without
1033 * writing a filemark otherwise.
1035 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1036 struct ide_atapi_pc *pc, int write_filemark)
1039 pc->c[0] = WRITE_FILEMARKS;
1040 pc->c[4] = write_filemark;
1041 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1044 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1046 idetape_tape_t *tape = drive->driver_data;
1047 struct gendisk *disk = tape->disk;
1048 int load_attempted = 0;
1050 /* Wait for the tape to become ready */
1051 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1053 while (time_before(jiffies, timeout)) {
1054 if (ide_do_test_unit_ready(drive, disk) == 0)
1056 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1057 || (tape->asc == 0x3A)) {
1061 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1063 /* not about to be ready */
1064 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1065 (tape->ascq == 1 || tape->ascq == 8)))
1072 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1074 struct ide_tape_obj *tape = drive->driver_data;
1075 struct ide_atapi_pc pc;
1078 idetape_create_write_filemark_cmd(drive, &pc, 0);
1079 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1082 idetape_wait_ready(drive, 60 * 5 * HZ);
1086 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1089 pc->c[0] = READ_POSITION;
1093 static int idetape_read_position(ide_drive_t *drive)
1095 idetape_tape_t *tape = drive->driver_data;
1096 struct ide_atapi_pc pc;
1099 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1101 idetape_create_read_position_cmd(&pc);
1102 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1104 position = tape->first_frame;
1108 static void idetape_create_locate_cmd(ide_drive_t *drive,
1109 struct ide_atapi_pc *pc,
1110 unsigned int block, u8 partition, int skip)
1113 pc->c[0] = POSITION_TO_ELEMENT;
1115 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1116 pc->c[8] = partition;
1117 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1120 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1122 idetape_tape_t *tape = drive->driver_data;
1124 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1127 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1128 tape->merge_bh_size = 0;
1129 if (tape->merge_bh != NULL) {
1130 ide_tape_kfree_buffer(tape);
1131 tape->merge_bh = NULL;
1134 tape->chrdev_dir = IDETAPE_DIR_NONE;
1138 * Position the tape to the requested block using the LOCATE packet command.
1139 * A READ POSITION command is then issued to check where we are positioned. Like
1140 * all higher level operations, we queue the commands at the tail of the request
1141 * queue and wait for their completion.
1143 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1144 u8 partition, int skip)
1146 idetape_tape_t *tape = drive->driver_data;
1147 struct gendisk *disk = tape->disk;
1149 struct ide_atapi_pc pc;
1151 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1152 __ide_tape_discard_merge_buffer(drive);
1153 idetape_wait_ready(drive, 60 * 5 * HZ);
1154 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1155 retval = ide_queue_pc_tail(drive, disk, &pc);
1159 idetape_create_read_position_cmd(&pc);
1160 return ide_queue_pc_tail(drive, disk, &pc);
1163 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1164 int restore_position)
1166 idetape_tape_t *tape = drive->driver_data;
1169 __ide_tape_discard_merge_buffer(drive);
1170 if (restore_position) {
1171 position = idetape_read_position(drive);
1172 seek = position > 0 ? position : 0;
1173 if (idetape_position_tape(drive, seek, 0, 0)) {
1174 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1175 " %s\n", tape->name, __func__);
1182 * Generate a read/write request for the block device interface and wait for it
1185 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1186 struct idetape_bh *bh)
1188 idetape_tape_t *tape = drive->driver_data;
1192 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1194 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1195 rq->cmd_type = REQ_TYPE_SPECIAL;
1197 rq->rq_disk = tape->disk;
1198 rq->special = (void *)bh;
1199 rq->sector = tape->first_frame;
1200 rq->nr_sectors = blocks;
1201 rq->current_nr_sectors = blocks;
1202 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1204 errors = rq->errors;
1205 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1206 blk_put_request(rq);
1208 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1212 idetape_init_merge_buffer(tape);
1213 if (errors == IDETAPE_ERROR_GENERAL)
1218 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1226 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1227 struct ide_atapi_pc *pc)
1230 pc->c[0] = REZERO_UNIT;
1231 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1234 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1239 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1242 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1246 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1248 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1251 /* Queue up a character device originated write request. */
1252 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1254 idetape_tape_t *tape = drive->driver_data;
1256 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1258 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1259 blocks, tape->merge_bh);
1262 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1264 idetape_tape_t *tape = drive->driver_data;
1266 struct idetape_bh *bh;
1268 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1269 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1270 " but we are not writing.\n");
1273 if (tape->merge_bh_size > tape->buffer_size) {
1274 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1275 tape->merge_bh_size = tape->buffer_size;
1277 if (tape->merge_bh_size) {
1278 blocks = tape->merge_bh_size / tape->blk_size;
1279 if (tape->merge_bh_size % tape->blk_size) {
1283 i = tape->blk_size - tape->merge_bh_size %
1285 bh = tape->bh->b_reqnext;
1287 atomic_set(&bh->b_count, 0);
1293 printk(KERN_INFO "ide-tape: bug,"
1297 min = min(i, (unsigned int)(bh->b_size -
1298 atomic_read(&bh->b_count)));
1299 memset(bh->b_data + atomic_read(&bh->b_count),
1301 atomic_add(min, &bh->b_count);
1306 (void) idetape_add_chrdev_write_request(drive, blocks);
1307 tape->merge_bh_size = 0;
1309 if (tape->merge_bh != NULL) {
1310 ide_tape_kfree_buffer(tape);
1311 tape->merge_bh = NULL;
1313 tape->chrdev_dir = IDETAPE_DIR_NONE;
1316 static int idetape_init_read(ide_drive_t *drive)
1318 idetape_tape_t *tape = drive->driver_data;
1321 /* Initialize read operation */
1322 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1323 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1324 ide_tape_flush_merge_buffer(drive);
1325 idetape_flush_tape_buffers(drive);
1327 if (tape->merge_bh || tape->merge_bh_size) {
1328 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1330 tape->merge_bh_size = 0;
1332 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1333 if (!tape->merge_bh)
1335 tape->chrdev_dir = IDETAPE_DIR_READ;
1338 * Issue a read 0 command to ensure that DSC handshake is
1339 * switched from completion mode to buffer available mode.
1340 * No point in issuing this if DSC overlap isn't supported, some
1341 * drives (Seagate STT3401A) will return an error.
1343 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1344 bytes_read = idetape_queue_rw_tail(drive,
1345 REQ_IDETAPE_READ, 0,
1347 if (bytes_read < 0) {
1348 ide_tape_kfree_buffer(tape);
1349 tape->merge_bh = NULL;
1350 tape->chrdev_dir = IDETAPE_DIR_NONE;
1359 /* called from idetape_chrdev_read() to service a chrdev read request. */
1360 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1362 idetape_tape_t *tape = drive->driver_data;
1364 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1366 /* If we are at a filemark, return a read length of 0 */
1367 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1370 idetape_init_read(drive);
1372 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1376 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1378 idetape_tape_t *tape = drive->driver_data;
1379 struct idetape_bh *bh;
1385 bh = tape->merge_bh;
1386 count = min(tape->buffer_size, bcount);
1388 blocks = count / tape->blk_size;
1390 atomic_set(&bh->b_count,
1391 min(count, (unsigned int)bh->b_size));
1392 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1393 count -= atomic_read(&bh->b_count);
1396 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1402 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1403 * currently support only one partition.
1405 static int idetape_rewind_tape(ide_drive_t *drive)
1407 struct ide_tape_obj *tape = drive->driver_data;
1408 struct gendisk *disk = tape->disk;
1410 struct ide_atapi_pc pc;
1412 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1414 idetape_create_rewind_cmd(drive, &pc);
1415 retval = ide_queue_pc_tail(drive, disk, &pc);
1419 idetape_create_read_position_cmd(&pc);
1420 retval = ide_queue_pc_tail(drive, disk, &pc);
1426 /* mtio.h compatible commands should be issued to the chrdev interface. */
1427 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1430 idetape_tape_t *tape = drive->driver_data;
1431 void __user *argp = (void __user *)arg;
1433 struct idetape_config {
1434 int dsc_rw_frequency;
1435 int dsc_media_access_frequency;
1439 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1443 if (copy_from_user(&config, argp, sizeof(config)))
1445 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1448 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1449 config.nr_stages = 1;
1450 if (copy_to_user(argp, &config, sizeof(config)))
1459 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1462 idetape_tape_t *tape = drive->driver_data;
1463 struct gendisk *disk = tape->disk;
1464 struct ide_atapi_pc pc;
1465 int retval, count = 0;
1466 int sprev = !!(tape->caps[4] & 0x20);
1470 if (MTBSF == mt_op || MTBSFM == mt_op) {
1473 mt_count = -mt_count;
1476 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1477 tape->merge_bh_size = 0;
1478 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1480 ide_tape_discard_merge_buffer(drive, 0);
1486 idetape_create_space_cmd(&pc, mt_count - count,
1487 IDETAPE_SPACE_OVER_FILEMARK);
1488 return ide_queue_pc_tail(drive, disk, &pc);
1493 retval = idetape_space_over_filemarks(drive, MTFSF,
1497 count = (MTBSFM == mt_op ? 1 : -1);
1498 return idetape_space_over_filemarks(drive, MTFSF, count);
1500 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1507 * Our character device read / write functions.
1509 * The tape is optimized to maximize throughput when it is transferring an
1510 * integral number of the "continuous transfer limit", which is a parameter of
1511 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1513 * As of version 1.3 of the driver, the character device provides an abstract
1514 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1515 * same backup/restore procedure is supported. The driver will internally
1516 * convert the requests to the recommended transfer unit, so that an unmatch
1517 * between the user's block size to the recommended size will only result in a
1518 * (slightly) increased driver overhead, but will no longer hit performance.
1519 * This is not applicable to Onstream.
1521 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1522 size_t count, loff_t *ppos)
1524 struct ide_tape_obj *tape = file->private_data;
1525 ide_drive_t *drive = tape->drive;
1526 ssize_t bytes_read, temp, actually_read = 0, rc;
1528 u16 ctl = *(u16 *)&tape->caps[12];
1530 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1532 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1533 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1534 if (count > tape->blk_size &&
1535 (count % tape->blk_size) == 0)
1536 tape->user_bs_factor = count / tape->blk_size;
1538 rc = idetape_init_read(drive);
1543 if (tape->merge_bh_size) {
1544 actually_read = min((unsigned int)(tape->merge_bh_size),
1545 (unsigned int)count);
1546 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1548 buf += actually_read;
1549 tape->merge_bh_size -= actually_read;
1550 count -= actually_read;
1552 while (count >= tape->buffer_size) {
1553 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1554 if (bytes_read <= 0)
1556 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1559 count -= bytes_read;
1560 actually_read += bytes_read;
1563 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1564 if (bytes_read <= 0)
1566 temp = min((unsigned long)count, (unsigned long)bytes_read);
1567 if (idetape_copy_stage_to_user(tape, buf, temp))
1569 actually_read += temp;
1570 tape->merge_bh_size = bytes_read-temp;
1573 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1574 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1576 idetape_space_over_filemarks(drive, MTFSF, 1);
1580 return ret ? ret : actually_read;
1583 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1584 size_t count, loff_t *ppos)
1586 struct ide_tape_obj *tape = file->private_data;
1587 ide_drive_t *drive = tape->drive;
1588 ssize_t actually_written = 0;
1590 u16 ctl = *(u16 *)&tape->caps[12];
1592 /* The drive is write protected. */
1593 if (tape->write_prot)
1596 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1598 /* Initialize write operation */
1599 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1600 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1601 ide_tape_discard_merge_buffer(drive, 1);
1602 if (tape->merge_bh || tape->merge_bh_size) {
1603 printk(KERN_ERR "ide-tape: merge_bh_size "
1604 "should be 0 now\n");
1605 tape->merge_bh_size = 0;
1607 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1608 if (!tape->merge_bh)
1610 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1611 idetape_init_merge_buffer(tape);
1614 * Issue a write 0 command to ensure that DSC handshake is
1615 * switched from completion mode to buffer available mode. No
1616 * point in issuing this if DSC overlap isn't supported, some
1617 * drives (Seagate STT3401A) will return an error.
1619 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1620 ssize_t retval = idetape_queue_rw_tail(drive,
1621 REQ_IDETAPE_WRITE, 0,
1624 ide_tape_kfree_buffer(tape);
1625 tape->merge_bh = NULL;
1626 tape->chrdev_dir = IDETAPE_DIR_NONE;
1633 if (tape->merge_bh_size) {
1634 if (tape->merge_bh_size >= tape->buffer_size) {
1635 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1636 tape->merge_bh_size = 0;
1638 actually_written = min((unsigned int)
1639 (tape->buffer_size - tape->merge_bh_size),
1640 (unsigned int)count);
1641 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1643 buf += actually_written;
1644 tape->merge_bh_size += actually_written;
1645 count -= actually_written;
1647 if (tape->merge_bh_size == tape->buffer_size) {
1649 tape->merge_bh_size = 0;
1650 retval = idetape_add_chrdev_write_request(drive, ctl);
1655 while (count >= tape->buffer_size) {
1657 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1659 buf += tape->buffer_size;
1660 count -= tape->buffer_size;
1661 retval = idetape_add_chrdev_write_request(drive, ctl);
1662 actually_written += tape->buffer_size;
1667 actually_written += count;
1668 if (idetape_copy_stage_from_user(tape, buf, count))
1670 tape->merge_bh_size += count;
1672 return ret ? ret : actually_written;
1675 static int idetape_write_filemark(ide_drive_t *drive)
1677 struct ide_tape_obj *tape = drive->driver_data;
1678 struct ide_atapi_pc pc;
1680 /* Write a filemark */
1681 idetape_create_write_filemark_cmd(drive, &pc, 1);
1682 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1683 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1690 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1693 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1694 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1695 * usually not supported.
1697 * The following commands are currently not supported:
1699 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1700 * MT_ST_WRITE_THRESHOLD.
1702 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1704 idetape_tape_t *tape = drive->driver_data;
1705 struct gendisk *disk = tape->disk;
1706 struct ide_atapi_pc pc;
1709 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1719 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1726 if (tape->write_prot)
1728 ide_tape_discard_merge_buffer(drive, 1);
1729 for (i = 0; i < mt_count; i++) {
1730 retval = idetape_write_filemark(drive);
1736 ide_tape_discard_merge_buffer(drive, 0);
1737 if (idetape_rewind_tape(drive))
1741 ide_tape_discard_merge_buffer(drive, 0);
1742 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1746 * If door is locked, attempt to unlock before
1747 * attempting to eject.
1749 if (tape->door_locked) {
1750 if (!ide_set_media_lock(drive, disk, 0))
1751 tape->door_locked = DOOR_UNLOCKED;
1753 ide_tape_discard_merge_buffer(drive, 0);
1754 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1756 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1759 ide_tape_discard_merge_buffer(drive, 0);
1760 return idetape_flush_tape_buffers(drive);
1762 ide_tape_discard_merge_buffer(drive, 0);
1763 return ide_do_start_stop(drive, disk,
1764 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1766 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1767 return ide_queue_pc_tail(drive, disk, &pc);
1769 (void)idetape_rewind_tape(drive);
1770 idetape_create_erase_cmd(&pc);
1771 return ide_queue_pc_tail(drive, disk, &pc);
1774 if (mt_count < tape->blk_size ||
1775 mt_count % tape->blk_size)
1777 tape->user_bs_factor = mt_count / tape->blk_size;
1778 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1780 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1783 ide_tape_discard_merge_buffer(drive, 0);
1784 return idetape_position_tape(drive,
1785 mt_count * tape->user_bs_factor, tape->partition, 0);
1787 ide_tape_discard_merge_buffer(drive, 0);
1788 return idetape_position_tape(drive, 0, mt_count, 0);
1792 retval = ide_set_media_lock(drive, disk, 1);
1795 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1798 retval = ide_set_media_lock(drive, disk, 0);
1801 tape->door_locked = DOOR_UNLOCKED;
1804 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1811 * Our character device ioctls. General mtio.h magnetic io commands are
1812 * supported here, and not in the corresponding block interface. Our own
1813 * ide-tape ioctls are supported on both interfaces.
1815 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1816 unsigned int cmd, unsigned long arg)
1818 struct ide_tape_obj *tape = file->private_data;
1819 ide_drive_t *drive = tape->drive;
1823 int block_offset = 0, position = tape->first_frame;
1824 void __user *argp = (void __user *)arg;
1826 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1828 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1829 ide_tape_flush_merge_buffer(drive);
1830 idetape_flush_tape_buffers(drive);
1832 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1833 block_offset = tape->merge_bh_size /
1834 (tape->blk_size * tape->user_bs_factor);
1835 position = idetape_read_position(drive);
1841 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1843 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1845 memset(&mtget, 0, sizeof(struct mtget));
1846 mtget.mt_type = MT_ISSCSI2;
1847 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1849 ((tape->blk_size * tape->user_bs_factor)
1850 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1852 if (tape->drv_write_prot)
1853 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1855 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1859 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1860 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1864 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1865 ide_tape_discard_merge_buffer(drive, 1);
1866 return idetape_blkdev_ioctl(drive, cmd, arg);
1871 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1872 * block size with the reported value.
1874 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1876 idetape_tape_t *tape = drive->driver_data;
1877 struct ide_atapi_pc pc;
1879 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1880 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1881 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1882 if (tape->blk_size == 0) {
1883 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1884 "block size, assuming 32k\n");
1885 tape->blk_size = 32768;
1889 tape->blk_size = (pc.buf[4 + 5] << 16) +
1890 (pc.buf[4 + 6] << 8) +
1892 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1895 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1897 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1899 idetape_tape_t *tape;
1902 if (i >= MAX_HWIFS * MAX_DRIVES)
1906 tape = ide_tape_chrdev_get(i);
1912 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1915 * We really want to do nonseekable_open(inode, filp); here, but some
1916 * versions of tar incorrectly call lseek on tapes and bail out if that
1917 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1919 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1921 drive = tape->drive;
1923 filp->private_data = tape;
1925 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1930 retval = idetape_wait_ready(drive, 60 * HZ);
1932 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1933 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1937 idetape_read_position(drive);
1938 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1939 (void)idetape_rewind_tape(drive);
1941 /* Read block size and write protect status from drive. */
1942 ide_tape_get_bsize_from_bdesc(drive);
1944 /* Set write protect flag if device is opened as read-only. */
1945 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1946 tape->write_prot = 1;
1948 tape->write_prot = tape->drv_write_prot;
1950 /* Make sure drive isn't write protected if user wants to write. */
1951 if (tape->write_prot) {
1952 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1953 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1954 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1960 /* Lock the tape drive door so user can't eject. */
1961 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1962 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1963 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1964 tape->door_locked = DOOR_LOCKED;
1976 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1978 idetape_tape_t *tape = drive->driver_data;
1980 ide_tape_flush_merge_buffer(drive);
1981 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
1982 if (tape->merge_bh != NULL) {
1983 idetape_pad_zeros(drive, tape->blk_size *
1984 (tape->user_bs_factor - 1));
1985 ide_tape_kfree_buffer(tape);
1986 tape->merge_bh = NULL;
1988 idetape_write_filemark(drive);
1989 idetape_flush_tape_buffers(drive);
1990 idetape_flush_tape_buffers(drive);
1993 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1995 struct ide_tape_obj *tape = filp->private_data;
1996 ide_drive_t *drive = tape->drive;
1997 unsigned int minor = iminor(inode);
2000 tape = drive->driver_data;
2002 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2004 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2005 idetape_write_release(drive, minor);
2006 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2008 ide_tape_discard_merge_buffer(drive, 1);
2011 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2012 (void) idetape_rewind_tape(drive);
2013 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2014 if (tape->door_locked == DOOR_LOCKED) {
2015 if (!ide_set_media_lock(drive, tape->disk, 0))
2016 tape->door_locked = DOOR_UNLOCKED;
2019 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2025 static void idetape_get_inquiry_results(ide_drive_t *drive)
2027 idetape_tape_t *tape = drive->driver_data;
2028 struct ide_atapi_pc pc;
2029 char fw_rev[4], vendor_id[8], product_id[16];
2031 idetape_create_inquiry_cmd(&pc);
2032 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2033 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2037 memcpy(vendor_id, &pc.buf[8], 8);
2038 memcpy(product_id, &pc.buf[16], 16);
2039 memcpy(fw_rev, &pc.buf[32], 4);
2041 ide_fixstring(vendor_id, 8, 0);
2042 ide_fixstring(product_id, 16, 0);
2043 ide_fixstring(fw_rev, 4, 0);
2045 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2046 drive->name, tape->name, vendor_id, product_id, fw_rev);
2050 * Ask the tape about its various parameters. In particular, we will adjust our
2051 * data transfer buffer size to the recommended value as returned by the tape.
2053 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2055 idetape_tape_t *tape = drive->driver_data;
2056 struct ide_atapi_pc pc;
2058 u8 speed, max_speed;
2060 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2061 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2062 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2063 " some default values\n");
2064 tape->blk_size = 512;
2065 put_unaligned(52, (u16 *)&tape->caps[12]);
2066 put_unaligned(540, (u16 *)&tape->caps[14]);
2067 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2070 caps = pc.buf + 4 + pc.buf[3];
2072 /* convert to host order and save for later use */
2073 speed = be16_to_cpup((__be16 *)&caps[14]);
2074 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2076 *(u16 *)&caps[8] = max_speed;
2077 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2078 *(u16 *)&caps[14] = speed;
2079 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2082 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2083 "(assuming 650KB/sec)\n", drive->name);
2084 *(u16 *)&caps[14] = 650;
2087 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2088 "(assuming 650KB/sec)\n", drive->name);
2089 *(u16 *)&caps[8] = 650;
2092 memcpy(&tape->caps, caps, 20);
2094 /* device lacks locking support according to capabilities page */
2095 if ((caps[6] & 1) == 0)
2096 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
2099 tape->blk_size = 512;
2100 else if (caps[7] & 0x04)
2101 tape->blk_size = 1024;
2104 #ifdef CONFIG_IDE_PROC_FS
2105 #define ide_tape_devset_get(name, field) \
2106 static int get_##name(ide_drive_t *drive) \
2108 idetape_tape_t *tape = drive->driver_data; \
2109 return tape->field; \
2112 #define ide_tape_devset_set(name, field) \
2113 static int set_##name(ide_drive_t *drive, int arg) \
2115 idetape_tape_t *tape = drive->driver_data; \
2116 tape->field = arg; \
2120 #define ide_tape_devset_rw_field(_name, _field) \
2121 ide_tape_devset_get(_name, _field) \
2122 ide_tape_devset_set(_name, _field) \
2123 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2125 #define ide_tape_devset_r_field(_name, _field) \
2126 ide_tape_devset_get(_name, _field) \
2127 IDE_DEVSET(_name, 0, get_##_name, NULL)
2129 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2130 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2131 static int divf_buffer(ide_drive_t *drive) { return 2; }
2132 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2134 ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
2136 ide_tape_devset_rw_field(debug_mask, debug_mask);
2137 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2139 ide_tape_devset_r_field(avg_speed, avg_speed);
2140 ide_tape_devset_r_field(speed, caps[14]);
2141 ide_tape_devset_r_field(buffer, caps[16]);
2142 ide_tape_devset_r_field(buffer_size, buffer_size);
2144 static const struct ide_proc_devset idetape_settings[] = {
2145 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2146 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2147 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2148 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2149 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2150 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2151 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2152 mulf_tdsc, divf_tdsc),
2158 * The function below is called to:
2160 * 1. Initialize our various state variables.
2161 * 2. Ask the tape for its capabilities.
2162 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2163 * is chosen based on the recommendation which we received in step 2.
2165 * Note that at this point ide.c already assigned us an irq, so that we can
2166 * queue requests here and wait for their completion.
2168 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2173 u16 *ctl = (u16 *)&tape->caps[12];
2175 drive->pc_callback = ide_tape_callback;
2176 drive->pc_update_buffers = idetape_update_buffers;
2177 drive->pc_io_buffers = ide_tape_io_buffers;
2179 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
2181 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2182 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2184 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2187 /* Seagate Travan drives do not support DSC overlap. */
2188 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2189 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2191 tape->minor = minor;
2192 tape->name[0] = 'h';
2193 tape->name[1] = 't';
2194 tape->name[2] = '0' + minor;
2195 tape->chrdev_dir = IDETAPE_DIR_NONE;
2197 idetape_get_inquiry_results(drive);
2198 idetape_get_mode_sense_results(drive);
2199 ide_tape_get_bsize_from_bdesc(drive);
2200 tape->user_bs_factor = 1;
2201 tape->buffer_size = *ctl * tape->blk_size;
2202 while (tape->buffer_size > 0xffff) {
2203 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2205 tape->buffer_size = *ctl * tape->blk_size;
2207 buffer_size = tape->buffer_size;
2208 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2209 if (buffer_size % PAGE_SIZE) {
2210 tape->pages_per_buffer++;
2211 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2214 /* select the "best" DSC read/write polling freq */
2215 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2217 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2220 * Ensure that the number we got makes sense; limit it within
2221 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2223 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2224 IDETAPE_DSC_RW_MAX);
2225 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2227 drive->name, tape->name, *(u16 *)&tape->caps[14],
2228 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2229 tape->buffer_size / 1024,
2230 tape->best_dsc_rw_freq * 1000 / HZ,
2231 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
2233 ide_proc_register_driver(drive, tape->driver);
2236 static void ide_tape_remove(ide_drive_t *drive)
2238 idetape_tape_t *tape = drive->driver_data;
2240 ide_proc_unregister_driver(drive, tape->driver);
2241 device_del(&tape->dev);
2242 ide_unregister_region(tape->disk);
2244 mutex_lock(&idetape_ref_mutex);
2245 put_device(&tape->dev);
2246 mutex_unlock(&idetape_ref_mutex);
2249 static void ide_tape_release(struct device *dev)
2251 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
2252 ide_drive_t *drive = tape->drive;
2253 struct gendisk *g = tape->disk;
2255 BUG_ON(tape->merge_bh_size);
2257 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2258 drive->driver_data = NULL;
2259 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2260 device_destroy(idetape_sysfs_class,
2261 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2262 idetape_devs[tape->minor] = NULL;
2263 g->private_data = NULL;
2268 #ifdef CONFIG_IDE_PROC_FS
2269 static int proc_idetape_read_name
2270 (char *page, char **start, off_t off, int count, int *eof, void *data)
2272 ide_drive_t *drive = (ide_drive_t *) data;
2273 idetape_tape_t *tape = drive->driver_data;
2277 len = sprintf(out, "%s\n", tape->name);
2278 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2281 static ide_proc_entry_t idetape_proc[] = {
2282 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2283 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2284 { NULL, 0, NULL, NULL }
2287 static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
2289 return idetape_proc;
2292 static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
2294 return idetape_settings;
2298 static int ide_tape_probe(ide_drive_t *);
2300 static struct ide_driver idetape_driver = {
2302 .owner = THIS_MODULE,
2304 .bus = &ide_bus_type,
2306 .probe = ide_tape_probe,
2307 .remove = ide_tape_remove,
2308 .version = IDETAPE_VERSION,
2309 .do_request = idetape_do_request,
2310 .end_request = idetape_end_request,
2311 #ifdef CONFIG_IDE_PROC_FS
2312 .proc_entries = ide_tape_proc_entries,
2313 .proc_devsets = ide_tape_proc_devsets,
2317 /* Our character device supporting functions, passed to register_chrdev. */
2318 static const struct file_operations idetape_fops = {
2319 .owner = THIS_MODULE,
2320 .read = idetape_chrdev_read,
2321 .write = idetape_chrdev_write,
2322 .ioctl = idetape_chrdev_ioctl,
2323 .open = idetape_chrdev_open,
2324 .release = idetape_chrdev_release,
2327 static int idetape_open(struct block_device *bdev, fmode_t mode)
2329 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
2337 static int idetape_release(struct gendisk *disk, fmode_t mode)
2339 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
2345 static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
2346 unsigned int cmd, unsigned long arg)
2348 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
2349 ide_drive_t *drive = tape->drive;
2350 int err = generic_ide_ioctl(drive, bdev, cmd, arg);
2352 err = idetape_blkdev_ioctl(drive, cmd, arg);
2356 static struct block_device_operations idetape_block_ops = {
2357 .owner = THIS_MODULE,
2358 .open = idetape_open,
2359 .release = idetape_release,
2360 .locked_ioctl = idetape_ioctl,
2363 static int ide_tape_probe(ide_drive_t *drive)
2365 idetape_tape_t *tape;
2369 if (!strstr("ide-tape", drive->driver_req))
2372 if (drive->media != ide_tape)
2375 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
2376 ide_check_atapi_device(drive, DRV_NAME) == 0) {
2377 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2378 " the driver\n", drive->name);
2381 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2383 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2388 g = alloc_disk(1 << PARTN_BITS);
2392 ide_init_disk(g, drive);
2394 tape->dev.parent = &drive->gendev;
2395 tape->dev.release = ide_tape_release;
2396 dev_set_name(&tape->dev, dev_name(&drive->gendev));
2398 if (device_register(&tape->dev))
2401 tape->drive = drive;
2402 tape->driver = &idetape_driver;
2405 g->private_data = &tape->driver;
2407 drive->driver_data = tape;
2409 mutex_lock(&idetape_ref_mutex);
2410 for (minor = 0; idetape_devs[minor]; minor++)
2412 idetape_devs[minor] = tape;
2413 mutex_unlock(&idetape_ref_mutex);
2415 idetape_setup(drive, tape, minor);
2417 device_create(idetape_sysfs_class, &drive->gendev,
2418 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2419 device_create(idetape_sysfs_class, &drive->gendev,
2420 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2423 g->fops = &idetape_block_ops;
2424 ide_register_region(g);
2436 static void __exit idetape_exit(void)
2438 driver_unregister(&idetape_driver.gen_driver);
2439 class_destroy(idetape_sysfs_class);
2440 unregister_chrdev(IDETAPE_MAJOR, "ht");
2443 static int __init idetape_init(void)
2446 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2447 if (IS_ERR(idetape_sysfs_class)) {
2448 idetape_sysfs_class = NULL;
2449 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2454 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2455 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2458 goto out_free_class;
2461 error = driver_register(&idetape_driver.gen_driver);
2463 goto out_free_driver;
2468 driver_unregister(&idetape_driver.gen_driver);
2470 class_destroy(idetape_sysfs_class);
2475 MODULE_ALIAS("ide:*m-tape*");
2476 module_init(idetape_init);
2477 module_exit(idetape_exit);
2478 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2479 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2480 MODULE_LICENSE("GPL");