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 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
156 #define IDETAPE_BLOCK_DESCRIPTOR 0
157 #define IDETAPE_CAPABILITIES_PAGE 0x2a
160 * Most of our global data which we need to save even as we leave the driver due
161 * to an interrupt or a timer event is stored in the struct defined below.
163 typedef struct ide_tape_obj {
165 struct ide_driver *driver;
166 struct gendisk *disk;
169 /* used by REQ_IDETAPE_{READ,WRITE} requests */
170 struct ide_atapi_pc queued_pc;
173 * DSC polling variables.
175 * While polling for DSC we use postponed_rq to postpone the current
176 * request so that ide.c will be able to service pending requests on the
177 * other device. Note that at most we will have only one DSC (usually
178 * data transfer) request in the device request queue.
180 struct request *postponed_rq;
181 /* The time in which we started polling for DSC */
182 unsigned long dsc_polling_start;
183 /* Timer used to poll for dsc */
184 struct timer_list dsc_timer;
185 /* Read/Write dsc polling frequency */
186 unsigned long best_dsc_rw_freq;
187 unsigned long dsc_poll_freq;
188 unsigned long dsc_timeout;
190 /* Read position information */
193 unsigned int first_frame;
195 /* Last error information */
196 u8 sense_key, asc, ascq;
198 /* Character device operation */
202 /* Current character device data transfer direction */
205 /* tape block size, usually 512 or 1024 bytes */
206 unsigned short blk_size;
209 /* Copy of the tape's Capabilities and Mechanical Page */
213 * Active data transfer request parameters.
215 * At most, there is only one ide-tape originated data transfer request
216 * in the device request queue. This allows ide.c to easily service
217 * requests from the other device when we postpone our active request.
220 /* Data buffer size chosen based on the tape's recommendation */
223 struct idetape_bh *merge_bh;
224 /* size of the merge buffer */
226 /* pointer to current buffer head within the merge buffer */
227 struct idetape_bh *bh;
231 int pages_per_buffer;
232 /* Wasted space in each stage */
235 /* Measures average tape speed */
236 unsigned long avg_time;
240 /* the door is currently locked */
242 /* the tape hardware is write protected */
244 /* the tape is write protected (hardware or opened as read-only) */
250 static DEFINE_MUTEX(idetape_ref_mutex);
252 static struct class *idetape_sysfs_class;
254 static void ide_tape_release(struct device *);
256 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
258 struct ide_tape_obj *tape = NULL;
260 mutex_lock(&idetape_ref_mutex);
261 tape = ide_drv_g(disk, ide_tape_obj);
263 if (ide_device_get(tape->drive))
266 get_device(&tape->dev);
268 mutex_unlock(&idetape_ref_mutex);
272 static void ide_tape_put(struct ide_tape_obj *tape)
274 ide_drive_t *drive = tape->drive;
276 mutex_lock(&idetape_ref_mutex);
277 put_device(&tape->dev);
278 ide_device_put(drive);
279 mutex_unlock(&idetape_ref_mutex);
283 * The variables below are used for the character device interface. Additional
284 * state variables are defined in our ide_drive_t structure.
286 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
288 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
290 struct ide_tape_obj *tape = NULL;
292 mutex_lock(&idetape_ref_mutex);
293 tape = idetape_devs[i];
295 get_device(&tape->dev);
296 mutex_unlock(&idetape_ref_mutex);
300 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
303 struct idetape_bh *bh = pc->bh;
308 printk(KERN_ERR "ide-tape: bh == NULL in "
309 "idetape_input_buffers\n");
310 ide_pad_transfer(drive, 0, bcount);
314 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
316 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
317 atomic_read(&bh->b_count), count);
319 atomic_add(count, &bh->b_count);
320 if (atomic_read(&bh->b_count) == bh->b_size) {
323 atomic_set(&bh->b_count, 0);
329 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
332 struct idetape_bh *bh = pc->bh;
337 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
341 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
342 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
345 pc->b_count -= count;
350 pc->b_data = bh->b_data;
351 pc->b_count = atomic_read(&bh->b_count);
357 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
359 struct idetape_bh *bh = pc->bh;
361 unsigned int bcount = pc->xferred;
363 if (pc->flags & PC_FLAG_WRITING)
367 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
371 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
372 atomic_set(&bh->b_count, count);
373 if (atomic_read(&bh->b_count) == bh->b_size)
381 * called on each failed packet command retry to analyze the request sense. We
382 * currently do not utilize this information.
384 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
386 idetape_tape_t *tape = drive->driver_data;
387 struct ide_atapi_pc *pc = drive->failed_pc;
389 tape->sense_key = sense[2] & 0xF;
390 tape->asc = sense[12];
391 tape->ascq = sense[13];
393 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
394 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
396 /* Correct pc->xferred by asking the tape. */
397 if (pc->flags & PC_FLAG_DMA_ERROR) {
398 pc->xferred = pc->req_xfer -
400 get_unaligned_be32(&sense[3]);
401 idetape_update_buffers(drive, pc);
405 * If error was the result of a zero-length read or write command,
406 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
407 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
409 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
411 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
412 if (tape->sense_key == 5) {
413 /* don't report an error, everything's ok */
415 /* don't retry read/write */
416 pc->flags |= PC_FLAG_ABORT;
419 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
420 pc->error = IDE_DRV_ERROR_FILEMARK;
421 pc->flags |= PC_FLAG_ABORT;
423 if (pc->c[0] == WRITE_6) {
424 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
425 && tape->asc == 0x0 && tape->ascq == 0x2)) {
426 pc->error = IDE_DRV_ERROR_EOD;
427 pc->flags |= PC_FLAG_ABORT;
430 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
431 if (tape->sense_key == 8) {
432 pc->error = IDE_DRV_ERROR_EOD;
433 pc->flags |= PC_FLAG_ABORT;
435 if (!(pc->flags & PC_FLAG_ABORT) &&
437 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
441 /* Free data buffers completely. */
442 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
444 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
447 u32 size = bh->b_size;
450 unsigned int order = fls(size >> PAGE_SHIFT)-1;
453 free_pages((unsigned long)bh->b_data, order);
456 bh->b_data += (1 << order) * PAGE_SIZE;
464 static void ide_tape_handle_dsc(ide_drive_t *);
466 static void ide_tape_callback(ide_drive_t *drive, int dsc)
468 idetape_tape_t *tape = drive->driver_data;
469 struct ide_atapi_pc *pc = drive->pc;
470 struct request *rq = drive->hwif->rq;
471 int uptodate = pc->error ? 0 : 1;
472 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
474 debug_log(DBG_PROCS, "Enter %s\n", __func__);
477 ide_tape_handle_dsc(drive);
479 if (drive->failed_pc == pc)
480 drive->failed_pc = NULL;
482 if (pc->c[0] == REQUEST_SENSE) {
484 idetape_analyze_error(drive, pc->buf);
486 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
487 "itself - Aborting request!\n");
488 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
489 int blocks = pc->xferred / tape->blk_size;
491 tape->avg_size += blocks * tape->blk_size;
493 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
494 tape->avg_speed = tape->avg_size * HZ /
495 (jiffies - tape->avg_time) / 1024;
497 tape->avg_time = jiffies;
500 tape->first_frame += blocks;
501 rq->current_nr_sectors -= blocks;
507 } else if (pc->c[0] == READ_POSITION && uptodate) {
508 u8 *readpos = pc->buf;
510 debug_log(DBG_SENSE, "BOP - %s\n",
511 (readpos[0] & 0x80) ? "Yes" : "No");
512 debug_log(DBG_SENSE, "EOP - %s\n",
513 (readpos[0] & 0x40) ? "Yes" : "No");
515 if (readpos[0] & 0x4) {
516 printk(KERN_INFO "ide-tape: Block location is unknown"
518 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
520 err = IDE_DRV_ERROR_GENERAL;
522 debug_log(DBG_SENSE, "Block Location - %u\n",
523 be32_to_cpup((__be32 *)&readpos[4]));
525 tape->partition = readpos[1];
526 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
527 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
534 drive->failed_pc = NULL;
536 if (blk_special_request(rq))
537 ide_complete_rq(drive, 0);
539 ide_end_request(drive, uptodate, 0);
543 * Postpone the current request so that ide.c will be able to service requests
544 * from another device on the same port while we are polling for DSC.
546 static void idetape_postpone_request(ide_drive_t *drive)
548 idetape_tape_t *tape = drive->driver_data;
550 debug_log(DBG_PROCS, "Enter %s\n", __func__);
552 tape->postponed_rq = drive->hwif->rq;
554 ide_stall_queue(drive, tape->dsc_poll_freq);
557 static void ide_tape_handle_dsc(ide_drive_t *drive)
559 idetape_tape_t *tape = drive->driver_data;
561 /* Media access command */
562 tape->dsc_polling_start = jiffies;
563 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
564 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
565 /* Allow ide.c to handle other requests */
566 idetape_postpone_request(drive);
569 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
570 unsigned int bcount, int write)
573 idetape_output_buffers(drive, pc, bcount);
575 idetape_input_buffers(drive, pc, bcount);
581 * Packet Command Interface
583 * The current Packet Command is available in drive->pc, and will not change
584 * until we finish handling it. Each packet command is associated with a
585 * callback function that will be called when the command is finished.
587 * The handling will be done in three stages:
589 * 1. idetape_issue_pc will send the packet command to the drive, and will set
590 * the interrupt handler to ide_pc_intr.
592 * 2. On each interrupt, ide_pc_intr will be called. This step will be
593 * repeated until the device signals us that no more interrupts will be issued.
595 * 3. ATAPI Tape media access commands have immediate status with a delayed
596 * process. In case of a successful initiation of a media access packet command,
597 * the DSC bit will be set when the actual execution of the command is finished.
598 * Since the tape drive will not issue an interrupt, we have to poll for this
599 * event. In this case, we define the request as "low priority request" by
600 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
603 * ide.c will then give higher priority to requests which originate from the
604 * other device, until will change rq_status to RQ_ACTIVE.
606 * 4. When the packet command is finished, it will be checked for errors.
608 * 5. In case an error was found, we queue a request sense packet command in
609 * front of the request queue and retry the operation up to
610 * IDETAPE_MAX_PC_RETRIES times.
612 * 6. In case no error was found, or we decided to give up and not to retry
613 * again, the callback function will be called and then we will handle the next
617 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
618 struct ide_atapi_pc *pc)
620 idetape_tape_t *tape = drive->driver_data;
622 if (drive->pc->c[0] == REQUEST_SENSE &&
623 pc->c[0] == REQUEST_SENSE) {
624 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
625 "Two request sense in serial were issued\n");
628 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
629 drive->failed_pc = pc;
631 /* Set the current packet command */
634 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
635 (pc->flags & PC_FLAG_ABORT)) {
637 * We will "abort" retrying a packet command in case legitimate
638 * error code was received (crossing a filemark, or end of the
639 * media, for example).
641 if (!(pc->flags & PC_FLAG_ABORT)) {
642 if (!(pc->c[0] == TEST_UNIT_READY &&
643 tape->sense_key == 2 && tape->asc == 4 &&
644 (tape->ascq == 1 || tape->ascq == 8))) {
645 printk(KERN_ERR "ide-tape: %s: I/O error, "
646 "pc = %2x, key = %2x, "
647 "asc = %2x, ascq = %2x\n",
648 tape->name, pc->c[0],
649 tape->sense_key, tape->asc,
653 pc->error = IDE_DRV_ERROR_GENERAL;
655 drive->failed_pc = NULL;
656 drive->pc_callback(drive, 0);
659 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
663 return ide_issue_pc(drive);
666 /* A mode sense command is used to "sense" tape parameters. */
667 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
670 pc->c[0] = MODE_SENSE;
671 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
672 /* DBD = 1 - Don't return block descriptors */
674 pc->c[2] = page_code;
676 * Changed pc->c[3] to 0 (255 will at best return unused info).
678 * For SCSI this byte is defined as subpage instead of high byte
679 * of length and some IDE drives seem to interpret it this way
680 * and return an error when 255 is used.
683 /* We will just discard data in that case */
685 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
687 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
693 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
695 ide_hwif_t *hwif = drive->hwif;
696 idetape_tape_t *tape = drive->driver_data;
697 struct ide_atapi_pc *pc = drive->pc;
700 stat = hwif->tp_ops->read_status(hwif);
702 if (stat & ATA_DSC) {
703 if (stat & ATA_ERR) {
705 if (pc->c[0] != TEST_UNIT_READY)
706 printk(KERN_ERR "ide-tape: %s: I/O error, ",
708 /* Retry operation */
709 ide_retry_pc(drive, tape->disk);
714 pc->error = IDE_DRV_ERROR_GENERAL;
715 drive->failed_pc = NULL;
717 drive->pc_callback(drive, 0);
721 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
722 struct ide_atapi_pc *pc, struct request *rq,
725 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
726 unsigned int length = rq->current_nr_sectors;
729 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
733 pc->buf_size = length * tape->blk_size;
734 pc->req_xfer = pc->buf_size;
735 if (pc->req_xfer == tape->buffer_size)
736 pc->flags |= PC_FLAG_DMA_OK;
738 if (opcode == READ_6) {
740 atomic_set(&bh->b_count, 0);
741 } else if (opcode == WRITE_6) {
743 pc->flags |= PC_FLAG_WRITING;
744 pc->b_data = bh->b_data;
745 pc->b_count = atomic_read(&bh->b_count);
748 memcpy(rq->cmd, pc->c, 12);
751 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
752 struct request *rq, sector_t block)
754 ide_hwif_t *hwif = drive->hwif;
755 idetape_tape_t *tape = drive->driver_data;
756 struct ide_atapi_pc *pc = NULL;
757 struct request *postponed_rq = tape->postponed_rq;
760 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
761 " current_nr_sectors: %u\n",
762 (unsigned long long)rq->sector, rq->nr_sectors,
763 rq->current_nr_sectors);
765 if (!blk_special_request(rq)) {
766 /* We do not support buffer cache originated requests. */
767 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
768 "request queue (%d)\n", drive->name, rq->cmd_type);
769 ide_end_request(drive, 0, 0);
773 /* Retry a failed packet command */
774 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
775 pc = drive->failed_pc;
779 if (postponed_rq != NULL)
780 if (rq != postponed_rq) {
781 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
782 "Two DSC requests were queued\n");
783 rq->errors = IDE_DRV_ERROR_GENERAL;
784 drive->failed_pc = NULL;
785 ide_complete_rq(drive, 0);
789 tape->postponed_rq = NULL;
792 * If the tape is still busy, postpone our request and service
793 * the other device meanwhile.
795 stat = hwif->tp_ops->read_status(hwif);
797 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
798 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
799 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
801 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
802 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
803 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
806 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
807 (stat & ATA_DSC) == 0) {
808 if (postponed_rq == NULL) {
809 tape->dsc_polling_start = jiffies;
810 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
811 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
812 } else if (time_after(jiffies, tape->dsc_timeout)) {
813 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
815 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
816 idetape_media_access_finished(drive);
819 return ide_do_reset(drive);
821 } else if (time_after(jiffies,
822 tape->dsc_polling_start +
823 IDETAPE_DSC_MA_THRESHOLD))
824 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
825 idetape_postpone_request(drive);
828 if (rq->cmd[13] & REQ_IDETAPE_READ) {
829 pc = &tape->queued_pc;
830 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
833 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
834 pc = &tape->queued_pc;
835 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
838 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
839 pc = (struct ide_atapi_pc *) rq->buffer;
840 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
841 rq->cmd[13] |= REQ_IDETAPE_PC2;
844 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
845 idetape_media_access_finished(drive);
851 return idetape_issue_pc(drive, pc);
855 * The function below uses __get_free_pages to allocate a data buffer of size
856 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
859 * It returns a pointer to the newly allocated buffer, or NULL in case of
862 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
865 struct idetape_bh *prev_bh, *bh, *merge_bh;
866 int pages = tape->pages_per_buffer;
867 unsigned int order, b_allocd;
870 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
875 order = fls(pages) - 1;
876 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
879 b_allocd = (1 << order) * PAGE_SIZE;
883 memset(bh->b_data, 0, b_allocd);
884 bh->b_reqnext = NULL;
885 bh->b_size = b_allocd;
886 atomic_set(&bh->b_count, full ? bh->b_size : 0);
889 order = fls(pages) - 1;
890 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
893 b_allocd = (1 << order) * PAGE_SIZE;
896 memset(b_data, 0, b_allocd);
898 /* newly allocated page frames below buffer header or ...*/
899 if (bh->b_data == b_data + b_allocd) {
900 bh->b_size += b_allocd;
901 bh->b_data -= b_allocd;
903 atomic_add(b_allocd, &bh->b_count);
906 /* they are above the header */
907 if (b_data == bh->b_data + bh->b_size) {
908 bh->b_size += b_allocd;
910 atomic_add(b_allocd, &bh->b_count);
914 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
916 free_pages((unsigned long) b_data, order);
919 bh->b_reqnext = NULL;
921 bh->b_size = b_allocd;
922 atomic_set(&bh->b_count, full ? bh->b_size : 0);
923 prev_bh->b_reqnext = bh;
928 bh->b_size -= tape->excess_bh_size;
930 atomic_sub(tape->excess_bh_size, &bh->b_count);
933 ide_tape_kfree_buffer(tape);
937 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
938 const char __user *buf, int n)
940 struct idetape_bh *bh = tape->bh;
946 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
950 count = min((unsigned int)
951 (bh->b_size - atomic_read(&bh->b_count)),
953 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
957 atomic_add(count, &bh->b_count);
959 if (atomic_read(&bh->b_count) == bh->b_size) {
962 atomic_set(&bh->b_count, 0);
969 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
972 struct idetape_bh *bh = tape->bh;
978 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
982 count = min(tape->b_count, n);
983 if (copy_to_user(buf, tape->b_data, count))
986 tape->b_data += count;
987 tape->b_count -= count;
989 if (!tape->b_count) {
993 tape->b_data = bh->b_data;
994 tape->b_count = atomic_read(&bh->b_count);
1001 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1003 struct idetape_bh *bh = tape->merge_bh;
1004 tape->bh = tape->merge_bh;
1006 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1007 atomic_set(&bh->b_count, 0);
1009 tape->b_data = bh->b_data;
1010 tape->b_count = atomic_read(&bh->b_count);
1015 * Write a filemark if write_filemark=1. Flush the device buffers without
1016 * writing a filemark otherwise.
1018 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1019 struct ide_atapi_pc *pc, int write_filemark)
1022 pc->c[0] = WRITE_FILEMARKS;
1023 pc->c[4] = write_filemark;
1024 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1027 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1029 idetape_tape_t *tape = drive->driver_data;
1030 struct gendisk *disk = tape->disk;
1031 int load_attempted = 0;
1033 /* Wait for the tape to become ready */
1034 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1036 while (time_before(jiffies, timeout)) {
1037 if (ide_do_test_unit_ready(drive, disk) == 0)
1039 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1040 || (tape->asc == 0x3A)) {
1044 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1046 /* not about to be ready */
1047 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1048 (tape->ascq == 1 || tape->ascq == 8)))
1055 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1057 struct ide_tape_obj *tape = drive->driver_data;
1058 struct ide_atapi_pc pc;
1061 idetape_create_write_filemark_cmd(drive, &pc, 0);
1062 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1065 idetape_wait_ready(drive, 60 * 5 * HZ);
1069 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1072 pc->c[0] = READ_POSITION;
1076 static int idetape_read_position(ide_drive_t *drive)
1078 idetape_tape_t *tape = drive->driver_data;
1079 struct ide_atapi_pc pc;
1082 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1084 idetape_create_read_position_cmd(&pc);
1085 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1087 position = tape->first_frame;
1091 static void idetape_create_locate_cmd(ide_drive_t *drive,
1092 struct ide_atapi_pc *pc,
1093 unsigned int block, u8 partition, int skip)
1096 pc->c[0] = POSITION_TO_ELEMENT;
1098 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1099 pc->c[8] = partition;
1100 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1103 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1105 idetape_tape_t *tape = drive->driver_data;
1107 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1110 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1111 tape->merge_bh_size = 0;
1112 if (tape->merge_bh != NULL) {
1113 ide_tape_kfree_buffer(tape);
1114 tape->merge_bh = NULL;
1117 tape->chrdev_dir = IDETAPE_DIR_NONE;
1121 * Position the tape to the requested block using the LOCATE packet command.
1122 * A READ POSITION command is then issued to check where we are positioned. Like
1123 * all higher level operations, we queue the commands at the tail of the request
1124 * queue and wait for their completion.
1126 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1127 u8 partition, int skip)
1129 idetape_tape_t *tape = drive->driver_data;
1130 struct gendisk *disk = tape->disk;
1132 struct ide_atapi_pc pc;
1134 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1135 __ide_tape_discard_merge_buffer(drive);
1136 idetape_wait_ready(drive, 60 * 5 * HZ);
1137 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1138 retval = ide_queue_pc_tail(drive, disk, &pc);
1142 idetape_create_read_position_cmd(&pc);
1143 return ide_queue_pc_tail(drive, disk, &pc);
1146 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1147 int restore_position)
1149 idetape_tape_t *tape = drive->driver_data;
1152 __ide_tape_discard_merge_buffer(drive);
1153 if (restore_position) {
1154 position = idetape_read_position(drive);
1155 seek = position > 0 ? position : 0;
1156 if (idetape_position_tape(drive, seek, 0, 0)) {
1157 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1158 " %s\n", tape->name, __func__);
1165 * Generate a read/write request for the block device interface and wait for it
1168 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1169 struct idetape_bh *bh)
1171 idetape_tape_t *tape = drive->driver_data;
1175 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1177 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1178 rq->cmd_type = REQ_TYPE_SPECIAL;
1180 rq->rq_disk = tape->disk;
1181 rq->special = (void *)bh;
1182 rq->sector = tape->first_frame;
1183 rq->nr_sectors = blocks;
1184 rq->current_nr_sectors = blocks;
1185 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1187 errors = rq->errors;
1188 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1189 blk_put_request(rq);
1191 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1195 idetape_init_merge_buffer(tape);
1196 if (errors == IDE_DRV_ERROR_GENERAL)
1201 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1209 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1210 struct ide_atapi_pc *pc)
1213 pc->c[0] = REZERO_UNIT;
1214 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1217 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1222 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1225 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1229 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1231 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1234 /* Queue up a character device originated write request. */
1235 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1237 idetape_tape_t *tape = drive->driver_data;
1239 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1241 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1242 blocks, tape->merge_bh);
1245 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1247 idetape_tape_t *tape = drive->driver_data;
1249 struct idetape_bh *bh;
1251 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1252 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1253 " but we are not writing.\n");
1256 if (tape->merge_bh_size > tape->buffer_size) {
1257 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1258 tape->merge_bh_size = tape->buffer_size;
1260 if (tape->merge_bh_size) {
1261 blocks = tape->merge_bh_size / tape->blk_size;
1262 if (tape->merge_bh_size % tape->blk_size) {
1266 i = tape->blk_size - tape->merge_bh_size %
1268 bh = tape->bh->b_reqnext;
1270 atomic_set(&bh->b_count, 0);
1276 printk(KERN_INFO "ide-tape: bug,"
1280 min = min(i, (unsigned int)(bh->b_size -
1281 atomic_read(&bh->b_count)));
1282 memset(bh->b_data + atomic_read(&bh->b_count),
1284 atomic_add(min, &bh->b_count);
1289 (void) idetape_add_chrdev_write_request(drive, blocks);
1290 tape->merge_bh_size = 0;
1292 if (tape->merge_bh != NULL) {
1293 ide_tape_kfree_buffer(tape);
1294 tape->merge_bh = NULL;
1296 tape->chrdev_dir = IDETAPE_DIR_NONE;
1299 static int idetape_init_read(ide_drive_t *drive)
1301 idetape_tape_t *tape = drive->driver_data;
1304 /* Initialize read operation */
1305 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1306 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1307 ide_tape_flush_merge_buffer(drive);
1308 idetape_flush_tape_buffers(drive);
1310 if (tape->merge_bh || tape->merge_bh_size) {
1311 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1313 tape->merge_bh_size = 0;
1315 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1316 if (!tape->merge_bh)
1318 tape->chrdev_dir = IDETAPE_DIR_READ;
1321 * Issue a read 0 command to ensure that DSC handshake is
1322 * switched from completion mode to buffer available mode.
1323 * No point in issuing this if DSC overlap isn't supported, some
1324 * drives (Seagate STT3401A) will return an error.
1326 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1327 bytes_read = idetape_queue_rw_tail(drive,
1328 REQ_IDETAPE_READ, 0,
1330 if (bytes_read < 0) {
1331 ide_tape_kfree_buffer(tape);
1332 tape->merge_bh = NULL;
1333 tape->chrdev_dir = IDETAPE_DIR_NONE;
1342 /* called from idetape_chrdev_read() to service a chrdev read request. */
1343 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1345 idetape_tape_t *tape = drive->driver_data;
1347 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1349 /* If we are at a filemark, return a read length of 0 */
1350 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1353 idetape_init_read(drive);
1355 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1359 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1361 idetape_tape_t *tape = drive->driver_data;
1362 struct idetape_bh *bh;
1368 bh = tape->merge_bh;
1369 count = min(tape->buffer_size, bcount);
1371 blocks = count / tape->blk_size;
1373 atomic_set(&bh->b_count,
1374 min(count, (unsigned int)bh->b_size));
1375 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1376 count -= atomic_read(&bh->b_count);
1379 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1385 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1386 * currently support only one partition.
1388 static int idetape_rewind_tape(ide_drive_t *drive)
1390 struct ide_tape_obj *tape = drive->driver_data;
1391 struct gendisk *disk = tape->disk;
1393 struct ide_atapi_pc pc;
1395 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1397 idetape_create_rewind_cmd(drive, &pc);
1398 retval = ide_queue_pc_tail(drive, disk, &pc);
1402 idetape_create_read_position_cmd(&pc);
1403 retval = ide_queue_pc_tail(drive, disk, &pc);
1409 /* mtio.h compatible commands should be issued to the chrdev interface. */
1410 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1413 idetape_tape_t *tape = drive->driver_data;
1414 void __user *argp = (void __user *)arg;
1416 struct idetape_config {
1417 int dsc_rw_frequency;
1418 int dsc_media_access_frequency;
1422 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1426 if (copy_from_user(&config, argp, sizeof(config)))
1428 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1431 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1432 config.nr_stages = 1;
1433 if (copy_to_user(argp, &config, sizeof(config)))
1442 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1445 idetape_tape_t *tape = drive->driver_data;
1446 struct gendisk *disk = tape->disk;
1447 struct ide_atapi_pc pc;
1448 int retval, count = 0;
1449 int sprev = !!(tape->caps[4] & 0x20);
1453 if (MTBSF == mt_op || MTBSFM == mt_op) {
1456 mt_count = -mt_count;
1459 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1460 tape->merge_bh_size = 0;
1461 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1463 ide_tape_discard_merge_buffer(drive, 0);
1469 idetape_create_space_cmd(&pc, mt_count - count,
1470 IDETAPE_SPACE_OVER_FILEMARK);
1471 return ide_queue_pc_tail(drive, disk, &pc);
1476 retval = idetape_space_over_filemarks(drive, MTFSF,
1480 count = (MTBSFM == mt_op ? 1 : -1);
1481 return idetape_space_over_filemarks(drive, MTFSF, count);
1483 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1490 * Our character device read / write functions.
1492 * The tape is optimized to maximize throughput when it is transferring an
1493 * integral number of the "continuous transfer limit", which is a parameter of
1494 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1496 * As of version 1.3 of the driver, the character device provides an abstract
1497 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1498 * same backup/restore procedure is supported. The driver will internally
1499 * convert the requests to the recommended transfer unit, so that an unmatch
1500 * between the user's block size to the recommended size will only result in a
1501 * (slightly) increased driver overhead, but will no longer hit performance.
1502 * This is not applicable to Onstream.
1504 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1505 size_t count, loff_t *ppos)
1507 struct ide_tape_obj *tape = file->private_data;
1508 ide_drive_t *drive = tape->drive;
1509 ssize_t bytes_read, temp, actually_read = 0, rc;
1511 u16 ctl = *(u16 *)&tape->caps[12];
1513 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1515 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1516 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1517 if (count > tape->blk_size &&
1518 (count % tape->blk_size) == 0)
1519 tape->user_bs_factor = count / tape->blk_size;
1521 rc = idetape_init_read(drive);
1526 if (tape->merge_bh_size) {
1527 actually_read = min((unsigned int)(tape->merge_bh_size),
1528 (unsigned int)count);
1529 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1531 buf += actually_read;
1532 tape->merge_bh_size -= actually_read;
1533 count -= actually_read;
1535 while (count >= tape->buffer_size) {
1536 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1537 if (bytes_read <= 0)
1539 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1542 count -= bytes_read;
1543 actually_read += bytes_read;
1546 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1547 if (bytes_read <= 0)
1549 temp = min((unsigned long)count, (unsigned long)bytes_read);
1550 if (idetape_copy_stage_to_user(tape, buf, temp))
1552 actually_read += temp;
1553 tape->merge_bh_size = bytes_read-temp;
1556 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1557 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1559 idetape_space_over_filemarks(drive, MTFSF, 1);
1563 return ret ? ret : actually_read;
1566 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1567 size_t count, loff_t *ppos)
1569 struct ide_tape_obj *tape = file->private_data;
1570 ide_drive_t *drive = tape->drive;
1571 ssize_t actually_written = 0;
1573 u16 ctl = *(u16 *)&tape->caps[12];
1575 /* The drive is write protected. */
1576 if (tape->write_prot)
1579 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1581 /* Initialize write operation */
1582 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1583 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1584 ide_tape_discard_merge_buffer(drive, 1);
1585 if (tape->merge_bh || tape->merge_bh_size) {
1586 printk(KERN_ERR "ide-tape: merge_bh_size "
1587 "should be 0 now\n");
1588 tape->merge_bh_size = 0;
1590 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1591 if (!tape->merge_bh)
1593 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1594 idetape_init_merge_buffer(tape);
1597 * Issue a write 0 command to ensure that DSC handshake is
1598 * switched from completion mode to buffer available mode. No
1599 * point in issuing this if DSC overlap isn't supported, some
1600 * drives (Seagate STT3401A) will return an error.
1602 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1603 ssize_t retval = idetape_queue_rw_tail(drive,
1604 REQ_IDETAPE_WRITE, 0,
1607 ide_tape_kfree_buffer(tape);
1608 tape->merge_bh = NULL;
1609 tape->chrdev_dir = IDETAPE_DIR_NONE;
1616 if (tape->merge_bh_size) {
1617 if (tape->merge_bh_size >= tape->buffer_size) {
1618 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1619 tape->merge_bh_size = 0;
1621 actually_written = min((unsigned int)
1622 (tape->buffer_size - tape->merge_bh_size),
1623 (unsigned int)count);
1624 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1626 buf += actually_written;
1627 tape->merge_bh_size += actually_written;
1628 count -= actually_written;
1630 if (tape->merge_bh_size == tape->buffer_size) {
1632 tape->merge_bh_size = 0;
1633 retval = idetape_add_chrdev_write_request(drive, ctl);
1638 while (count >= tape->buffer_size) {
1640 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1642 buf += tape->buffer_size;
1643 count -= tape->buffer_size;
1644 retval = idetape_add_chrdev_write_request(drive, ctl);
1645 actually_written += tape->buffer_size;
1650 actually_written += count;
1651 if (idetape_copy_stage_from_user(tape, buf, count))
1653 tape->merge_bh_size += count;
1655 return ret ? ret : actually_written;
1658 static int idetape_write_filemark(ide_drive_t *drive)
1660 struct ide_tape_obj *tape = drive->driver_data;
1661 struct ide_atapi_pc pc;
1663 /* Write a filemark */
1664 idetape_create_write_filemark_cmd(drive, &pc, 1);
1665 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1666 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1673 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1676 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1677 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1678 * usually not supported.
1680 * The following commands are currently not supported:
1682 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1683 * MT_ST_WRITE_THRESHOLD.
1685 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1687 idetape_tape_t *tape = drive->driver_data;
1688 struct gendisk *disk = tape->disk;
1689 struct ide_atapi_pc pc;
1692 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1702 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1709 if (tape->write_prot)
1711 ide_tape_discard_merge_buffer(drive, 1);
1712 for (i = 0; i < mt_count; i++) {
1713 retval = idetape_write_filemark(drive);
1719 ide_tape_discard_merge_buffer(drive, 0);
1720 if (idetape_rewind_tape(drive))
1724 ide_tape_discard_merge_buffer(drive, 0);
1725 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1729 * If door is locked, attempt to unlock before
1730 * attempting to eject.
1732 if (tape->door_locked) {
1733 if (!ide_set_media_lock(drive, disk, 0))
1734 tape->door_locked = DOOR_UNLOCKED;
1736 ide_tape_discard_merge_buffer(drive, 0);
1737 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1739 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1742 ide_tape_discard_merge_buffer(drive, 0);
1743 return idetape_flush_tape_buffers(drive);
1745 ide_tape_discard_merge_buffer(drive, 0);
1746 return ide_do_start_stop(drive, disk,
1747 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1749 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1750 return ide_queue_pc_tail(drive, disk, &pc);
1752 (void)idetape_rewind_tape(drive);
1753 idetape_create_erase_cmd(&pc);
1754 return ide_queue_pc_tail(drive, disk, &pc);
1757 if (mt_count < tape->blk_size ||
1758 mt_count % tape->blk_size)
1760 tape->user_bs_factor = mt_count / tape->blk_size;
1761 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1763 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1766 ide_tape_discard_merge_buffer(drive, 0);
1767 return idetape_position_tape(drive,
1768 mt_count * tape->user_bs_factor, tape->partition, 0);
1770 ide_tape_discard_merge_buffer(drive, 0);
1771 return idetape_position_tape(drive, 0, mt_count, 0);
1775 retval = ide_set_media_lock(drive, disk, 1);
1778 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1781 retval = ide_set_media_lock(drive, disk, 0);
1784 tape->door_locked = DOOR_UNLOCKED;
1787 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1794 * Our character device ioctls. General mtio.h magnetic io commands are
1795 * supported here, and not in the corresponding block interface. Our own
1796 * ide-tape ioctls are supported on both interfaces.
1798 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1799 unsigned int cmd, unsigned long arg)
1801 struct ide_tape_obj *tape = file->private_data;
1802 ide_drive_t *drive = tape->drive;
1806 int block_offset = 0, position = tape->first_frame;
1807 void __user *argp = (void __user *)arg;
1809 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1811 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1812 ide_tape_flush_merge_buffer(drive);
1813 idetape_flush_tape_buffers(drive);
1815 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1816 block_offset = tape->merge_bh_size /
1817 (tape->blk_size * tape->user_bs_factor);
1818 position = idetape_read_position(drive);
1824 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1826 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1828 memset(&mtget, 0, sizeof(struct mtget));
1829 mtget.mt_type = MT_ISSCSI2;
1830 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1832 ((tape->blk_size * tape->user_bs_factor)
1833 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1835 if (tape->drv_write_prot)
1836 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1838 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1842 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1843 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1847 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1848 ide_tape_discard_merge_buffer(drive, 1);
1849 return idetape_blkdev_ioctl(drive, cmd, arg);
1854 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1855 * block size with the reported value.
1857 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1859 idetape_tape_t *tape = drive->driver_data;
1860 struct ide_atapi_pc pc;
1862 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1863 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1864 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1865 if (tape->blk_size == 0) {
1866 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1867 "block size, assuming 32k\n");
1868 tape->blk_size = 32768;
1872 tape->blk_size = (pc.buf[4 + 5] << 16) +
1873 (pc.buf[4 + 6] << 8) +
1875 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1878 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1880 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1882 idetape_tape_t *tape;
1885 if (i >= MAX_HWIFS * MAX_DRIVES)
1889 tape = ide_tape_chrdev_get(i);
1895 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1898 * We really want to do nonseekable_open(inode, filp); here, but some
1899 * versions of tar incorrectly call lseek on tapes and bail out if that
1900 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1902 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1904 drive = tape->drive;
1906 filp->private_data = tape;
1908 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1913 retval = idetape_wait_ready(drive, 60 * HZ);
1915 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1916 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1920 idetape_read_position(drive);
1921 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1922 (void)idetape_rewind_tape(drive);
1924 /* Read block size and write protect status from drive. */
1925 ide_tape_get_bsize_from_bdesc(drive);
1927 /* Set write protect flag if device is opened as read-only. */
1928 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1929 tape->write_prot = 1;
1931 tape->write_prot = tape->drv_write_prot;
1933 /* Make sure drive isn't write protected if user wants to write. */
1934 if (tape->write_prot) {
1935 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1936 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1937 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1943 /* Lock the tape drive door so user can't eject. */
1944 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1945 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1946 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1947 tape->door_locked = DOOR_LOCKED;
1959 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1961 idetape_tape_t *tape = drive->driver_data;
1963 ide_tape_flush_merge_buffer(drive);
1964 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
1965 if (tape->merge_bh != NULL) {
1966 idetape_pad_zeros(drive, tape->blk_size *
1967 (tape->user_bs_factor - 1));
1968 ide_tape_kfree_buffer(tape);
1969 tape->merge_bh = NULL;
1971 idetape_write_filemark(drive);
1972 idetape_flush_tape_buffers(drive);
1973 idetape_flush_tape_buffers(drive);
1976 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1978 struct ide_tape_obj *tape = filp->private_data;
1979 ide_drive_t *drive = tape->drive;
1980 unsigned int minor = iminor(inode);
1983 tape = drive->driver_data;
1985 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1987 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1988 idetape_write_release(drive, minor);
1989 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1991 ide_tape_discard_merge_buffer(drive, 1);
1994 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
1995 (void) idetape_rewind_tape(drive);
1996 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1997 if (tape->door_locked == DOOR_LOCKED) {
1998 if (!ide_set_media_lock(drive, tape->disk, 0))
1999 tape->door_locked = DOOR_UNLOCKED;
2002 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2008 static void idetape_get_inquiry_results(ide_drive_t *drive)
2010 idetape_tape_t *tape = drive->driver_data;
2011 struct ide_atapi_pc pc;
2012 char fw_rev[4], vendor_id[8], product_id[16];
2014 idetape_create_inquiry_cmd(&pc);
2015 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2016 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2020 memcpy(vendor_id, &pc.buf[8], 8);
2021 memcpy(product_id, &pc.buf[16], 16);
2022 memcpy(fw_rev, &pc.buf[32], 4);
2024 ide_fixstring(vendor_id, 8, 0);
2025 ide_fixstring(product_id, 16, 0);
2026 ide_fixstring(fw_rev, 4, 0);
2028 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2029 drive->name, tape->name, vendor_id, product_id, fw_rev);
2033 * Ask the tape about its various parameters. In particular, we will adjust our
2034 * data transfer buffer size to the recommended value as returned by the tape.
2036 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2038 idetape_tape_t *tape = drive->driver_data;
2039 struct ide_atapi_pc pc;
2041 u8 speed, max_speed;
2043 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2044 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2045 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2046 " some default values\n");
2047 tape->blk_size = 512;
2048 put_unaligned(52, (u16 *)&tape->caps[12]);
2049 put_unaligned(540, (u16 *)&tape->caps[14]);
2050 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2053 caps = pc.buf + 4 + pc.buf[3];
2055 /* convert to host order and save for later use */
2056 speed = be16_to_cpup((__be16 *)&caps[14]);
2057 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2059 *(u16 *)&caps[8] = max_speed;
2060 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2061 *(u16 *)&caps[14] = speed;
2062 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2065 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2066 "(assuming 650KB/sec)\n", drive->name);
2067 *(u16 *)&caps[14] = 650;
2070 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2071 "(assuming 650KB/sec)\n", drive->name);
2072 *(u16 *)&caps[8] = 650;
2075 memcpy(&tape->caps, caps, 20);
2077 /* device lacks locking support according to capabilities page */
2078 if ((caps[6] & 1) == 0)
2079 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
2082 tape->blk_size = 512;
2083 else if (caps[7] & 0x04)
2084 tape->blk_size = 1024;
2087 #ifdef CONFIG_IDE_PROC_FS
2088 #define ide_tape_devset_get(name, field) \
2089 static int get_##name(ide_drive_t *drive) \
2091 idetape_tape_t *tape = drive->driver_data; \
2092 return tape->field; \
2095 #define ide_tape_devset_set(name, field) \
2096 static int set_##name(ide_drive_t *drive, int arg) \
2098 idetape_tape_t *tape = drive->driver_data; \
2099 tape->field = arg; \
2103 #define ide_tape_devset_rw_field(_name, _field) \
2104 ide_tape_devset_get(_name, _field) \
2105 ide_tape_devset_set(_name, _field) \
2106 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2108 #define ide_tape_devset_r_field(_name, _field) \
2109 ide_tape_devset_get(_name, _field) \
2110 IDE_DEVSET(_name, 0, get_##_name, NULL)
2112 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2113 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2114 static int divf_buffer(ide_drive_t *drive) { return 2; }
2115 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2117 ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
2119 ide_tape_devset_rw_field(debug_mask, debug_mask);
2120 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2122 ide_tape_devset_r_field(avg_speed, avg_speed);
2123 ide_tape_devset_r_field(speed, caps[14]);
2124 ide_tape_devset_r_field(buffer, caps[16]);
2125 ide_tape_devset_r_field(buffer_size, buffer_size);
2127 static const struct ide_proc_devset idetape_settings[] = {
2128 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2129 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2130 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2131 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2132 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2133 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2134 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2135 mulf_tdsc, divf_tdsc),
2141 * The function below is called to:
2143 * 1. Initialize our various state variables.
2144 * 2. Ask the tape for its capabilities.
2145 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2146 * is chosen based on the recommendation which we received in step 2.
2148 * Note that at this point ide.c already assigned us an irq, so that we can
2149 * queue requests here and wait for their completion.
2151 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2156 u16 *ctl = (u16 *)&tape->caps[12];
2158 drive->pc_callback = ide_tape_callback;
2159 drive->pc_update_buffers = idetape_update_buffers;
2160 drive->pc_io_buffers = ide_tape_io_buffers;
2162 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
2164 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2165 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2167 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2170 /* Seagate Travan drives do not support DSC overlap. */
2171 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2172 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2174 tape->minor = minor;
2175 tape->name[0] = 'h';
2176 tape->name[1] = 't';
2177 tape->name[2] = '0' + minor;
2178 tape->chrdev_dir = IDETAPE_DIR_NONE;
2180 idetape_get_inquiry_results(drive);
2181 idetape_get_mode_sense_results(drive);
2182 ide_tape_get_bsize_from_bdesc(drive);
2183 tape->user_bs_factor = 1;
2184 tape->buffer_size = *ctl * tape->blk_size;
2185 while (tape->buffer_size > 0xffff) {
2186 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2188 tape->buffer_size = *ctl * tape->blk_size;
2190 buffer_size = tape->buffer_size;
2191 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2192 if (buffer_size % PAGE_SIZE) {
2193 tape->pages_per_buffer++;
2194 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2197 /* select the "best" DSC read/write polling freq */
2198 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2200 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2203 * Ensure that the number we got makes sense; limit it within
2204 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2206 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2207 IDETAPE_DSC_RW_MAX);
2208 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2210 drive->name, tape->name, *(u16 *)&tape->caps[14],
2211 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2212 tape->buffer_size / 1024,
2213 tape->best_dsc_rw_freq * 1000 / HZ,
2214 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
2216 ide_proc_register_driver(drive, tape->driver);
2219 static void ide_tape_remove(ide_drive_t *drive)
2221 idetape_tape_t *tape = drive->driver_data;
2223 ide_proc_unregister_driver(drive, tape->driver);
2224 device_del(&tape->dev);
2225 ide_unregister_region(tape->disk);
2227 mutex_lock(&idetape_ref_mutex);
2228 put_device(&tape->dev);
2229 mutex_unlock(&idetape_ref_mutex);
2232 static void ide_tape_release(struct device *dev)
2234 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
2235 ide_drive_t *drive = tape->drive;
2236 struct gendisk *g = tape->disk;
2238 BUG_ON(tape->merge_bh_size);
2240 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2241 drive->driver_data = NULL;
2242 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2243 device_destroy(idetape_sysfs_class,
2244 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2245 idetape_devs[tape->minor] = NULL;
2246 g->private_data = NULL;
2251 #ifdef CONFIG_IDE_PROC_FS
2252 static int proc_idetape_read_name
2253 (char *page, char **start, off_t off, int count, int *eof, void *data)
2255 ide_drive_t *drive = (ide_drive_t *) data;
2256 idetape_tape_t *tape = drive->driver_data;
2260 len = sprintf(out, "%s\n", tape->name);
2261 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2264 static ide_proc_entry_t idetape_proc[] = {
2265 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2266 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2267 { NULL, 0, NULL, NULL }
2270 static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
2272 return idetape_proc;
2275 static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
2277 return idetape_settings;
2281 static int ide_tape_probe(ide_drive_t *);
2283 static struct ide_driver idetape_driver = {
2285 .owner = THIS_MODULE,
2287 .bus = &ide_bus_type,
2289 .probe = ide_tape_probe,
2290 .remove = ide_tape_remove,
2291 .version = IDETAPE_VERSION,
2292 .do_request = idetape_do_request,
2293 #ifdef CONFIG_IDE_PROC_FS
2294 .proc_entries = ide_tape_proc_entries,
2295 .proc_devsets = ide_tape_proc_devsets,
2299 /* Our character device supporting functions, passed to register_chrdev. */
2300 static const struct file_operations idetape_fops = {
2301 .owner = THIS_MODULE,
2302 .read = idetape_chrdev_read,
2303 .write = idetape_chrdev_write,
2304 .ioctl = idetape_chrdev_ioctl,
2305 .open = idetape_chrdev_open,
2306 .release = idetape_chrdev_release,
2309 static int idetape_open(struct block_device *bdev, fmode_t mode)
2311 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
2319 static int idetape_release(struct gendisk *disk, fmode_t mode)
2321 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
2327 static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
2328 unsigned int cmd, unsigned long arg)
2330 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
2331 ide_drive_t *drive = tape->drive;
2332 int err = generic_ide_ioctl(drive, bdev, cmd, arg);
2334 err = idetape_blkdev_ioctl(drive, cmd, arg);
2338 static struct block_device_operations idetape_block_ops = {
2339 .owner = THIS_MODULE,
2340 .open = idetape_open,
2341 .release = idetape_release,
2342 .locked_ioctl = idetape_ioctl,
2345 static int ide_tape_probe(ide_drive_t *drive)
2347 idetape_tape_t *tape;
2351 if (!strstr("ide-tape", drive->driver_req))
2354 if (drive->media != ide_tape)
2357 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
2358 ide_check_atapi_device(drive, DRV_NAME) == 0) {
2359 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2360 " the driver\n", drive->name);
2363 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2365 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2370 g = alloc_disk(1 << PARTN_BITS);
2374 ide_init_disk(g, drive);
2376 tape->dev.parent = &drive->gendev;
2377 tape->dev.release = ide_tape_release;
2378 dev_set_name(&tape->dev, dev_name(&drive->gendev));
2380 if (device_register(&tape->dev))
2383 tape->drive = drive;
2384 tape->driver = &idetape_driver;
2387 g->private_data = &tape->driver;
2389 drive->driver_data = tape;
2391 mutex_lock(&idetape_ref_mutex);
2392 for (minor = 0; idetape_devs[minor]; minor++)
2394 idetape_devs[minor] = tape;
2395 mutex_unlock(&idetape_ref_mutex);
2397 idetape_setup(drive, tape, minor);
2399 device_create(idetape_sysfs_class, &drive->gendev,
2400 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2401 device_create(idetape_sysfs_class, &drive->gendev,
2402 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2405 g->fops = &idetape_block_ops;
2406 ide_register_region(g);
2418 static void __exit idetape_exit(void)
2420 driver_unregister(&idetape_driver.gen_driver);
2421 class_destroy(idetape_sysfs_class);
2422 unregister_chrdev(IDETAPE_MAJOR, "ht");
2425 static int __init idetape_init(void)
2428 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2429 if (IS_ERR(idetape_sysfs_class)) {
2430 idetape_sysfs_class = NULL;
2431 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2436 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2437 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2440 goto out_free_class;
2443 error = driver_register(&idetape_driver.gen_driver);
2445 goto out_free_driver;
2450 driver_unregister(&idetape_driver.gen_driver);
2452 class_destroy(idetape_sysfs_class);
2457 MODULE_ALIAS("ide:*m-tape*");
2458 module_init(idetape_init);
2459 module_exit(idetape_exit);
2460 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2461 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2462 MODULE_LICENSE("GPL");