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 int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
466 struct request *rq = drive->hwif->rq;
469 debug_log(DBG_PROCS, "Enter %s\n", __func__);
472 case 0: error = IDE_DRV_ERROR_GENERAL; break;
473 case 1: error = 0; break;
474 default: error = uptodate;
478 drive->failed_pc = NULL;
480 if (!blk_special_request(rq)) {
481 ide_end_request(drive, uptodate, nr_sects);
485 ide_complete_rq(drive, 0);
490 static void ide_tape_handle_dsc(ide_drive_t *);
492 static void ide_tape_callback(ide_drive_t *drive, int dsc)
494 idetape_tape_t *tape = drive->driver_data;
495 struct ide_atapi_pc *pc = drive->pc;
496 int uptodate = pc->error ? 0 : 1;
498 debug_log(DBG_PROCS, "Enter %s\n", __func__);
501 ide_tape_handle_dsc(drive);
503 if (drive->failed_pc == pc)
504 drive->failed_pc = NULL;
506 if (pc->c[0] == REQUEST_SENSE) {
508 idetape_analyze_error(drive, pc->buf);
510 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
511 "itself - Aborting request!\n");
512 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
513 struct request *rq = drive->hwif->rq;
514 int blocks = pc->xferred / tape->blk_size;
516 tape->avg_size += blocks * tape->blk_size;
518 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
519 tape->avg_speed = tape->avg_size * HZ /
520 (jiffies - tape->avg_time) / 1024;
522 tape->avg_time = jiffies;
525 tape->first_frame += blocks;
526 rq->current_nr_sectors -= blocks;
529 uptodate = pc->error;
530 } else if (pc->c[0] == READ_POSITION && uptodate) {
531 u8 *readpos = pc->buf;
533 debug_log(DBG_SENSE, "BOP - %s\n",
534 (readpos[0] & 0x80) ? "Yes" : "No");
535 debug_log(DBG_SENSE, "EOP - %s\n",
536 (readpos[0] & 0x40) ? "Yes" : "No");
538 if (readpos[0] & 0x4) {
539 printk(KERN_INFO "ide-tape: Block location is unknown"
541 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
544 debug_log(DBG_SENSE, "Block Location - %u\n",
545 be32_to_cpup((__be32 *)&readpos[4]));
547 tape->partition = readpos[1];
548 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
549 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
553 idetape_end_request(drive, uptodate, 0);
557 * Postpone the current request so that ide.c will be able to service requests
558 * from another device on the same port while we are polling for DSC.
560 static void idetape_postpone_request(ide_drive_t *drive)
562 idetape_tape_t *tape = drive->driver_data;
564 debug_log(DBG_PROCS, "Enter %s\n", __func__);
566 tape->postponed_rq = drive->hwif->rq;
568 ide_stall_queue(drive, tape->dsc_poll_freq);
571 static void ide_tape_handle_dsc(ide_drive_t *drive)
573 idetape_tape_t *tape = drive->driver_data;
575 /* Media access command */
576 tape->dsc_polling_start = jiffies;
577 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
578 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
579 /* Allow ide.c to handle other requests */
580 idetape_postpone_request(drive);
583 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
584 unsigned int bcount, int write)
587 idetape_output_buffers(drive, pc, bcount);
589 idetape_input_buffers(drive, pc, bcount);
595 * Packet Command Interface
597 * The current Packet Command is available in drive->pc, and will not change
598 * until we finish handling it. Each packet command is associated with a
599 * callback function that will be called when the command is finished.
601 * The handling will be done in three stages:
603 * 1. idetape_issue_pc will send the packet command to the drive, and will set
604 * the interrupt handler to ide_pc_intr.
606 * 2. On each interrupt, ide_pc_intr will be called. This step will be
607 * repeated until the device signals us that no more interrupts will be issued.
609 * 3. ATAPI Tape media access commands have immediate status with a delayed
610 * process. In case of a successful initiation of a media access packet command,
611 * the DSC bit will be set when the actual execution of the command is finished.
612 * Since the tape drive will not issue an interrupt, we have to poll for this
613 * event. In this case, we define the request as "low priority request" by
614 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
617 * ide.c will then give higher priority to requests which originate from the
618 * other device, until will change rq_status to RQ_ACTIVE.
620 * 4. When the packet command is finished, it will be checked for errors.
622 * 5. In case an error was found, we queue a request sense packet command in
623 * front of the request queue and retry the operation up to
624 * IDETAPE_MAX_PC_RETRIES times.
626 * 6. In case no error was found, or we decided to give up and not to retry
627 * again, the callback function will be called and then we will handle the next
631 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
632 struct ide_atapi_pc *pc)
634 idetape_tape_t *tape = drive->driver_data;
636 if (drive->pc->c[0] == REQUEST_SENSE &&
637 pc->c[0] == REQUEST_SENSE) {
638 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
639 "Two request sense in serial were issued\n");
642 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
643 drive->failed_pc = pc;
645 /* Set the current packet command */
648 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
649 (pc->flags & PC_FLAG_ABORT)) {
651 * We will "abort" retrying a packet command in case legitimate
652 * error code was received (crossing a filemark, or end of the
653 * media, for example).
655 if (!(pc->flags & PC_FLAG_ABORT)) {
656 if (!(pc->c[0] == TEST_UNIT_READY &&
657 tape->sense_key == 2 && tape->asc == 4 &&
658 (tape->ascq == 1 || tape->ascq == 8))) {
659 printk(KERN_ERR "ide-tape: %s: I/O error, "
660 "pc = %2x, key = %2x, "
661 "asc = %2x, ascq = %2x\n",
662 tape->name, pc->c[0],
663 tape->sense_key, tape->asc,
667 pc->error = IDE_DRV_ERROR_GENERAL;
669 drive->failed_pc = NULL;
670 drive->pc_callback(drive, 0);
673 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
677 return ide_issue_pc(drive);
680 /* A mode sense command is used to "sense" tape parameters. */
681 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
684 pc->c[0] = MODE_SENSE;
685 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
686 /* DBD = 1 - Don't return block descriptors */
688 pc->c[2] = page_code;
690 * Changed pc->c[3] to 0 (255 will at best return unused info).
692 * For SCSI this byte is defined as subpage instead of high byte
693 * of length and some IDE drives seem to interpret it this way
694 * and return an error when 255 is used.
697 /* We will just discard data in that case */
699 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
701 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
707 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
709 ide_hwif_t *hwif = drive->hwif;
710 idetape_tape_t *tape = drive->driver_data;
711 struct ide_atapi_pc *pc = drive->pc;
714 stat = hwif->tp_ops->read_status(hwif);
716 if (stat & ATA_DSC) {
717 if (stat & ATA_ERR) {
719 if (pc->c[0] != TEST_UNIT_READY)
720 printk(KERN_ERR "ide-tape: %s: I/O error, ",
722 /* Retry operation */
723 ide_retry_pc(drive, tape->disk);
728 pc->error = IDE_DRV_ERROR_GENERAL;
729 drive->failed_pc = NULL;
731 drive->pc_callback(drive, 0);
735 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
736 struct ide_atapi_pc *pc, struct request *rq,
739 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
740 unsigned int length = rq->current_nr_sectors;
743 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
747 pc->buf_size = length * tape->blk_size;
748 pc->req_xfer = pc->buf_size;
749 if (pc->req_xfer == tape->buffer_size)
750 pc->flags |= PC_FLAG_DMA_OK;
752 if (opcode == READ_6) {
754 atomic_set(&bh->b_count, 0);
755 } else if (opcode == WRITE_6) {
757 pc->flags |= PC_FLAG_WRITING;
758 pc->b_data = bh->b_data;
759 pc->b_count = atomic_read(&bh->b_count);
762 memcpy(rq->cmd, pc->c, 12);
765 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
766 struct request *rq, sector_t block)
768 ide_hwif_t *hwif = drive->hwif;
769 idetape_tape_t *tape = drive->driver_data;
770 struct ide_atapi_pc *pc = NULL;
771 struct request *postponed_rq = tape->postponed_rq;
774 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
775 " current_nr_sectors: %u\n",
776 (unsigned long long)rq->sector, rq->nr_sectors,
777 rq->current_nr_sectors);
779 if (!blk_special_request(rq)) {
780 /* We do not support buffer cache originated requests. */
781 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
782 "request queue (%d)\n", drive->name, rq->cmd_type);
783 ide_end_request(drive, 0, 0);
787 /* Retry a failed packet command */
788 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
789 pc = drive->failed_pc;
793 if (postponed_rq != NULL)
794 if (rq != postponed_rq) {
795 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
796 "Two DSC requests were queued\n");
797 idetape_end_request(drive, 0, 0);
801 tape->postponed_rq = NULL;
804 * If the tape is still busy, postpone our request and service
805 * the other device meanwhile.
807 stat = hwif->tp_ops->read_status(hwif);
809 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
810 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
811 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
813 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
814 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
815 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
818 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
819 (stat & ATA_DSC) == 0) {
820 if (postponed_rq == NULL) {
821 tape->dsc_polling_start = jiffies;
822 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
823 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
824 } else if (time_after(jiffies, tape->dsc_timeout)) {
825 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
827 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
828 idetape_media_access_finished(drive);
831 return ide_do_reset(drive);
833 } else if (time_after(jiffies,
834 tape->dsc_polling_start +
835 IDETAPE_DSC_MA_THRESHOLD))
836 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
837 idetape_postpone_request(drive);
840 if (rq->cmd[13] & REQ_IDETAPE_READ) {
841 pc = &tape->queued_pc;
842 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
845 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
846 pc = &tape->queued_pc;
847 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
850 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
851 pc = (struct ide_atapi_pc *) rq->buffer;
852 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
853 rq->cmd[13] |= REQ_IDETAPE_PC2;
856 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
857 idetape_media_access_finished(drive);
863 return idetape_issue_pc(drive, pc);
867 * The function below uses __get_free_pages to allocate a data buffer of size
868 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
871 * It returns a pointer to the newly allocated buffer, or NULL in case of
874 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
877 struct idetape_bh *prev_bh, *bh, *merge_bh;
878 int pages = tape->pages_per_buffer;
879 unsigned int order, b_allocd;
882 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
887 order = fls(pages) - 1;
888 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
891 b_allocd = (1 << order) * PAGE_SIZE;
895 memset(bh->b_data, 0, b_allocd);
896 bh->b_reqnext = NULL;
897 bh->b_size = b_allocd;
898 atomic_set(&bh->b_count, full ? bh->b_size : 0);
901 order = fls(pages) - 1;
902 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
905 b_allocd = (1 << order) * PAGE_SIZE;
908 memset(b_data, 0, b_allocd);
910 /* newly allocated page frames below buffer header or ...*/
911 if (bh->b_data == b_data + b_allocd) {
912 bh->b_size += b_allocd;
913 bh->b_data -= b_allocd;
915 atomic_add(b_allocd, &bh->b_count);
918 /* they are above the header */
919 if (b_data == bh->b_data + bh->b_size) {
920 bh->b_size += b_allocd;
922 atomic_add(b_allocd, &bh->b_count);
926 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
928 free_pages((unsigned long) b_data, order);
931 bh->b_reqnext = NULL;
933 bh->b_size = b_allocd;
934 atomic_set(&bh->b_count, full ? bh->b_size : 0);
935 prev_bh->b_reqnext = bh;
940 bh->b_size -= tape->excess_bh_size;
942 atomic_sub(tape->excess_bh_size, &bh->b_count);
945 ide_tape_kfree_buffer(tape);
949 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
950 const char __user *buf, int n)
952 struct idetape_bh *bh = tape->bh;
958 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
962 count = min((unsigned int)
963 (bh->b_size - atomic_read(&bh->b_count)),
965 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
969 atomic_add(count, &bh->b_count);
971 if (atomic_read(&bh->b_count) == bh->b_size) {
974 atomic_set(&bh->b_count, 0);
981 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
984 struct idetape_bh *bh = tape->bh;
990 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
994 count = min(tape->b_count, n);
995 if (copy_to_user(buf, tape->b_data, count))
998 tape->b_data += count;
999 tape->b_count -= count;
1001 if (!tape->b_count) {
1005 tape->b_data = bh->b_data;
1006 tape->b_count = atomic_read(&bh->b_count);
1013 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1015 struct idetape_bh *bh = tape->merge_bh;
1016 tape->bh = tape->merge_bh;
1018 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1019 atomic_set(&bh->b_count, 0);
1021 tape->b_data = bh->b_data;
1022 tape->b_count = atomic_read(&bh->b_count);
1027 * Write a filemark if write_filemark=1. Flush the device buffers without
1028 * writing a filemark otherwise.
1030 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1031 struct ide_atapi_pc *pc, int write_filemark)
1034 pc->c[0] = WRITE_FILEMARKS;
1035 pc->c[4] = write_filemark;
1036 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1039 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1041 idetape_tape_t *tape = drive->driver_data;
1042 struct gendisk *disk = tape->disk;
1043 int load_attempted = 0;
1045 /* Wait for the tape to become ready */
1046 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1048 while (time_before(jiffies, timeout)) {
1049 if (ide_do_test_unit_ready(drive, disk) == 0)
1051 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1052 || (tape->asc == 0x3A)) {
1056 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1058 /* not about to be ready */
1059 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1060 (tape->ascq == 1 || tape->ascq == 8)))
1067 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1069 struct ide_tape_obj *tape = drive->driver_data;
1070 struct ide_atapi_pc pc;
1073 idetape_create_write_filemark_cmd(drive, &pc, 0);
1074 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1077 idetape_wait_ready(drive, 60 * 5 * HZ);
1081 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1084 pc->c[0] = READ_POSITION;
1088 static int idetape_read_position(ide_drive_t *drive)
1090 idetape_tape_t *tape = drive->driver_data;
1091 struct ide_atapi_pc pc;
1094 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1096 idetape_create_read_position_cmd(&pc);
1097 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1099 position = tape->first_frame;
1103 static void idetape_create_locate_cmd(ide_drive_t *drive,
1104 struct ide_atapi_pc *pc,
1105 unsigned int block, u8 partition, int skip)
1108 pc->c[0] = POSITION_TO_ELEMENT;
1110 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1111 pc->c[8] = partition;
1112 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1115 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1117 idetape_tape_t *tape = drive->driver_data;
1119 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1122 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1123 tape->merge_bh_size = 0;
1124 if (tape->merge_bh != NULL) {
1125 ide_tape_kfree_buffer(tape);
1126 tape->merge_bh = NULL;
1129 tape->chrdev_dir = IDETAPE_DIR_NONE;
1133 * Position the tape to the requested block using the LOCATE packet command.
1134 * A READ POSITION command is then issued to check where we are positioned. Like
1135 * all higher level operations, we queue the commands at the tail of the request
1136 * queue and wait for their completion.
1138 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1139 u8 partition, int skip)
1141 idetape_tape_t *tape = drive->driver_data;
1142 struct gendisk *disk = tape->disk;
1144 struct ide_atapi_pc pc;
1146 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1147 __ide_tape_discard_merge_buffer(drive);
1148 idetape_wait_ready(drive, 60 * 5 * HZ);
1149 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1150 retval = ide_queue_pc_tail(drive, disk, &pc);
1154 idetape_create_read_position_cmd(&pc);
1155 return ide_queue_pc_tail(drive, disk, &pc);
1158 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1159 int restore_position)
1161 idetape_tape_t *tape = drive->driver_data;
1164 __ide_tape_discard_merge_buffer(drive);
1165 if (restore_position) {
1166 position = idetape_read_position(drive);
1167 seek = position > 0 ? position : 0;
1168 if (idetape_position_tape(drive, seek, 0, 0)) {
1169 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1170 " %s\n", tape->name, __func__);
1177 * Generate a read/write request for the block device interface and wait for it
1180 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1181 struct idetape_bh *bh)
1183 idetape_tape_t *tape = drive->driver_data;
1187 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1189 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1190 rq->cmd_type = REQ_TYPE_SPECIAL;
1192 rq->rq_disk = tape->disk;
1193 rq->special = (void *)bh;
1194 rq->sector = tape->first_frame;
1195 rq->nr_sectors = blocks;
1196 rq->current_nr_sectors = blocks;
1197 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1199 errors = rq->errors;
1200 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1201 blk_put_request(rq);
1203 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1207 idetape_init_merge_buffer(tape);
1208 if (errors == IDE_DRV_ERROR_GENERAL)
1213 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1221 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1222 struct ide_atapi_pc *pc)
1225 pc->c[0] = REZERO_UNIT;
1226 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1229 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1234 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1237 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1241 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1243 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1246 /* Queue up a character device originated write request. */
1247 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1249 idetape_tape_t *tape = drive->driver_data;
1251 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1253 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1254 blocks, tape->merge_bh);
1257 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1259 idetape_tape_t *tape = drive->driver_data;
1261 struct idetape_bh *bh;
1263 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1264 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1265 " but we are not writing.\n");
1268 if (tape->merge_bh_size > tape->buffer_size) {
1269 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1270 tape->merge_bh_size = tape->buffer_size;
1272 if (tape->merge_bh_size) {
1273 blocks = tape->merge_bh_size / tape->blk_size;
1274 if (tape->merge_bh_size % tape->blk_size) {
1278 i = tape->blk_size - tape->merge_bh_size %
1280 bh = tape->bh->b_reqnext;
1282 atomic_set(&bh->b_count, 0);
1288 printk(KERN_INFO "ide-tape: bug,"
1292 min = min(i, (unsigned int)(bh->b_size -
1293 atomic_read(&bh->b_count)));
1294 memset(bh->b_data + atomic_read(&bh->b_count),
1296 atomic_add(min, &bh->b_count);
1301 (void) idetape_add_chrdev_write_request(drive, blocks);
1302 tape->merge_bh_size = 0;
1304 if (tape->merge_bh != NULL) {
1305 ide_tape_kfree_buffer(tape);
1306 tape->merge_bh = NULL;
1308 tape->chrdev_dir = IDETAPE_DIR_NONE;
1311 static int idetape_init_read(ide_drive_t *drive)
1313 idetape_tape_t *tape = drive->driver_data;
1316 /* Initialize read operation */
1317 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1318 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1319 ide_tape_flush_merge_buffer(drive);
1320 idetape_flush_tape_buffers(drive);
1322 if (tape->merge_bh || tape->merge_bh_size) {
1323 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1325 tape->merge_bh_size = 0;
1327 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1328 if (!tape->merge_bh)
1330 tape->chrdev_dir = IDETAPE_DIR_READ;
1333 * Issue a read 0 command to ensure that DSC handshake is
1334 * switched from completion mode to buffer available mode.
1335 * No point in issuing this if DSC overlap isn't supported, some
1336 * drives (Seagate STT3401A) will return an error.
1338 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1339 bytes_read = idetape_queue_rw_tail(drive,
1340 REQ_IDETAPE_READ, 0,
1342 if (bytes_read < 0) {
1343 ide_tape_kfree_buffer(tape);
1344 tape->merge_bh = NULL;
1345 tape->chrdev_dir = IDETAPE_DIR_NONE;
1354 /* called from idetape_chrdev_read() to service a chrdev read request. */
1355 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1357 idetape_tape_t *tape = drive->driver_data;
1359 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1361 /* If we are at a filemark, return a read length of 0 */
1362 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1365 idetape_init_read(drive);
1367 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1371 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1373 idetape_tape_t *tape = drive->driver_data;
1374 struct idetape_bh *bh;
1380 bh = tape->merge_bh;
1381 count = min(tape->buffer_size, bcount);
1383 blocks = count / tape->blk_size;
1385 atomic_set(&bh->b_count,
1386 min(count, (unsigned int)bh->b_size));
1387 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1388 count -= atomic_read(&bh->b_count);
1391 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1397 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1398 * currently support only one partition.
1400 static int idetape_rewind_tape(ide_drive_t *drive)
1402 struct ide_tape_obj *tape = drive->driver_data;
1403 struct gendisk *disk = tape->disk;
1405 struct ide_atapi_pc pc;
1407 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1409 idetape_create_rewind_cmd(drive, &pc);
1410 retval = ide_queue_pc_tail(drive, disk, &pc);
1414 idetape_create_read_position_cmd(&pc);
1415 retval = ide_queue_pc_tail(drive, disk, &pc);
1421 /* mtio.h compatible commands should be issued to the chrdev interface. */
1422 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1425 idetape_tape_t *tape = drive->driver_data;
1426 void __user *argp = (void __user *)arg;
1428 struct idetape_config {
1429 int dsc_rw_frequency;
1430 int dsc_media_access_frequency;
1434 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1438 if (copy_from_user(&config, argp, sizeof(config)))
1440 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1443 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1444 config.nr_stages = 1;
1445 if (copy_to_user(argp, &config, sizeof(config)))
1454 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1457 idetape_tape_t *tape = drive->driver_data;
1458 struct gendisk *disk = tape->disk;
1459 struct ide_atapi_pc pc;
1460 int retval, count = 0;
1461 int sprev = !!(tape->caps[4] & 0x20);
1465 if (MTBSF == mt_op || MTBSFM == mt_op) {
1468 mt_count = -mt_count;
1471 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1472 tape->merge_bh_size = 0;
1473 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1475 ide_tape_discard_merge_buffer(drive, 0);
1481 idetape_create_space_cmd(&pc, mt_count - count,
1482 IDETAPE_SPACE_OVER_FILEMARK);
1483 return ide_queue_pc_tail(drive, disk, &pc);
1488 retval = idetape_space_over_filemarks(drive, MTFSF,
1492 count = (MTBSFM == mt_op ? 1 : -1);
1493 return idetape_space_over_filemarks(drive, MTFSF, count);
1495 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1502 * Our character device read / write functions.
1504 * The tape is optimized to maximize throughput when it is transferring an
1505 * integral number of the "continuous transfer limit", which is a parameter of
1506 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1508 * As of version 1.3 of the driver, the character device provides an abstract
1509 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1510 * same backup/restore procedure is supported. The driver will internally
1511 * convert the requests to the recommended transfer unit, so that an unmatch
1512 * between the user's block size to the recommended size will only result in a
1513 * (slightly) increased driver overhead, but will no longer hit performance.
1514 * This is not applicable to Onstream.
1516 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1517 size_t count, loff_t *ppos)
1519 struct ide_tape_obj *tape = file->private_data;
1520 ide_drive_t *drive = tape->drive;
1521 ssize_t bytes_read, temp, actually_read = 0, rc;
1523 u16 ctl = *(u16 *)&tape->caps[12];
1525 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1527 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1528 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1529 if (count > tape->blk_size &&
1530 (count % tape->blk_size) == 0)
1531 tape->user_bs_factor = count / tape->blk_size;
1533 rc = idetape_init_read(drive);
1538 if (tape->merge_bh_size) {
1539 actually_read = min((unsigned int)(tape->merge_bh_size),
1540 (unsigned int)count);
1541 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1543 buf += actually_read;
1544 tape->merge_bh_size -= actually_read;
1545 count -= actually_read;
1547 while (count >= tape->buffer_size) {
1548 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1549 if (bytes_read <= 0)
1551 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1554 count -= bytes_read;
1555 actually_read += bytes_read;
1558 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1559 if (bytes_read <= 0)
1561 temp = min((unsigned long)count, (unsigned long)bytes_read);
1562 if (idetape_copy_stage_to_user(tape, buf, temp))
1564 actually_read += temp;
1565 tape->merge_bh_size = bytes_read-temp;
1568 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1569 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1571 idetape_space_over_filemarks(drive, MTFSF, 1);
1575 return ret ? ret : actually_read;
1578 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1579 size_t count, loff_t *ppos)
1581 struct ide_tape_obj *tape = file->private_data;
1582 ide_drive_t *drive = tape->drive;
1583 ssize_t actually_written = 0;
1585 u16 ctl = *(u16 *)&tape->caps[12];
1587 /* The drive is write protected. */
1588 if (tape->write_prot)
1591 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1593 /* Initialize write operation */
1594 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1595 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1596 ide_tape_discard_merge_buffer(drive, 1);
1597 if (tape->merge_bh || tape->merge_bh_size) {
1598 printk(KERN_ERR "ide-tape: merge_bh_size "
1599 "should be 0 now\n");
1600 tape->merge_bh_size = 0;
1602 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1603 if (!tape->merge_bh)
1605 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1606 idetape_init_merge_buffer(tape);
1609 * Issue a write 0 command to ensure that DSC handshake is
1610 * switched from completion mode to buffer available mode. No
1611 * point in issuing this if DSC overlap isn't supported, some
1612 * drives (Seagate STT3401A) will return an error.
1614 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1615 ssize_t retval = idetape_queue_rw_tail(drive,
1616 REQ_IDETAPE_WRITE, 0,
1619 ide_tape_kfree_buffer(tape);
1620 tape->merge_bh = NULL;
1621 tape->chrdev_dir = IDETAPE_DIR_NONE;
1628 if (tape->merge_bh_size) {
1629 if (tape->merge_bh_size >= tape->buffer_size) {
1630 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1631 tape->merge_bh_size = 0;
1633 actually_written = min((unsigned int)
1634 (tape->buffer_size - tape->merge_bh_size),
1635 (unsigned int)count);
1636 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1638 buf += actually_written;
1639 tape->merge_bh_size += actually_written;
1640 count -= actually_written;
1642 if (tape->merge_bh_size == tape->buffer_size) {
1644 tape->merge_bh_size = 0;
1645 retval = idetape_add_chrdev_write_request(drive, ctl);
1650 while (count >= tape->buffer_size) {
1652 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1654 buf += tape->buffer_size;
1655 count -= tape->buffer_size;
1656 retval = idetape_add_chrdev_write_request(drive, ctl);
1657 actually_written += tape->buffer_size;
1662 actually_written += count;
1663 if (idetape_copy_stage_from_user(tape, buf, count))
1665 tape->merge_bh_size += count;
1667 return ret ? ret : actually_written;
1670 static int idetape_write_filemark(ide_drive_t *drive)
1672 struct ide_tape_obj *tape = drive->driver_data;
1673 struct ide_atapi_pc pc;
1675 /* Write a filemark */
1676 idetape_create_write_filemark_cmd(drive, &pc, 1);
1677 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1678 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1685 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1688 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1689 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1690 * usually not supported.
1692 * The following commands are currently not supported:
1694 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1695 * MT_ST_WRITE_THRESHOLD.
1697 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1699 idetape_tape_t *tape = drive->driver_data;
1700 struct gendisk *disk = tape->disk;
1701 struct ide_atapi_pc pc;
1704 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1714 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1721 if (tape->write_prot)
1723 ide_tape_discard_merge_buffer(drive, 1);
1724 for (i = 0; i < mt_count; i++) {
1725 retval = idetape_write_filemark(drive);
1731 ide_tape_discard_merge_buffer(drive, 0);
1732 if (idetape_rewind_tape(drive))
1736 ide_tape_discard_merge_buffer(drive, 0);
1737 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1741 * If door is locked, attempt to unlock before
1742 * attempting to eject.
1744 if (tape->door_locked) {
1745 if (!ide_set_media_lock(drive, disk, 0))
1746 tape->door_locked = DOOR_UNLOCKED;
1748 ide_tape_discard_merge_buffer(drive, 0);
1749 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1751 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1754 ide_tape_discard_merge_buffer(drive, 0);
1755 return idetape_flush_tape_buffers(drive);
1757 ide_tape_discard_merge_buffer(drive, 0);
1758 return ide_do_start_stop(drive, disk,
1759 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1761 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1762 return ide_queue_pc_tail(drive, disk, &pc);
1764 (void)idetape_rewind_tape(drive);
1765 idetape_create_erase_cmd(&pc);
1766 return ide_queue_pc_tail(drive, disk, &pc);
1769 if (mt_count < tape->blk_size ||
1770 mt_count % tape->blk_size)
1772 tape->user_bs_factor = mt_count / tape->blk_size;
1773 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1775 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1778 ide_tape_discard_merge_buffer(drive, 0);
1779 return idetape_position_tape(drive,
1780 mt_count * tape->user_bs_factor, tape->partition, 0);
1782 ide_tape_discard_merge_buffer(drive, 0);
1783 return idetape_position_tape(drive, 0, mt_count, 0);
1787 retval = ide_set_media_lock(drive, disk, 1);
1790 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1793 retval = ide_set_media_lock(drive, disk, 0);
1796 tape->door_locked = DOOR_UNLOCKED;
1799 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1806 * Our character device ioctls. General mtio.h magnetic io commands are
1807 * supported here, and not in the corresponding block interface. Our own
1808 * ide-tape ioctls are supported on both interfaces.
1810 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1811 unsigned int cmd, unsigned long arg)
1813 struct ide_tape_obj *tape = file->private_data;
1814 ide_drive_t *drive = tape->drive;
1818 int block_offset = 0, position = tape->first_frame;
1819 void __user *argp = (void __user *)arg;
1821 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1823 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1824 ide_tape_flush_merge_buffer(drive);
1825 idetape_flush_tape_buffers(drive);
1827 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1828 block_offset = tape->merge_bh_size /
1829 (tape->blk_size * tape->user_bs_factor);
1830 position = idetape_read_position(drive);
1836 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1838 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1840 memset(&mtget, 0, sizeof(struct mtget));
1841 mtget.mt_type = MT_ISSCSI2;
1842 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1844 ((tape->blk_size * tape->user_bs_factor)
1845 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1847 if (tape->drv_write_prot)
1848 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1850 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1854 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1855 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1859 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1860 ide_tape_discard_merge_buffer(drive, 1);
1861 return idetape_blkdev_ioctl(drive, cmd, arg);
1866 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1867 * block size with the reported value.
1869 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1871 idetape_tape_t *tape = drive->driver_data;
1872 struct ide_atapi_pc pc;
1874 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1875 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1876 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1877 if (tape->blk_size == 0) {
1878 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1879 "block size, assuming 32k\n");
1880 tape->blk_size = 32768;
1884 tape->blk_size = (pc.buf[4 + 5] << 16) +
1885 (pc.buf[4 + 6] << 8) +
1887 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1890 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1892 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1894 idetape_tape_t *tape;
1897 if (i >= MAX_HWIFS * MAX_DRIVES)
1901 tape = ide_tape_chrdev_get(i);
1907 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1910 * We really want to do nonseekable_open(inode, filp); here, but some
1911 * versions of tar incorrectly call lseek on tapes and bail out if that
1912 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1914 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1916 drive = tape->drive;
1918 filp->private_data = tape;
1920 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1925 retval = idetape_wait_ready(drive, 60 * HZ);
1927 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1928 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1932 idetape_read_position(drive);
1933 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1934 (void)idetape_rewind_tape(drive);
1936 /* Read block size and write protect status from drive. */
1937 ide_tape_get_bsize_from_bdesc(drive);
1939 /* Set write protect flag if device is opened as read-only. */
1940 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1941 tape->write_prot = 1;
1943 tape->write_prot = tape->drv_write_prot;
1945 /* Make sure drive isn't write protected if user wants to write. */
1946 if (tape->write_prot) {
1947 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1948 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1949 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1955 /* Lock the tape drive door so user can't eject. */
1956 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1957 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1958 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1959 tape->door_locked = DOOR_LOCKED;
1971 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1973 idetape_tape_t *tape = drive->driver_data;
1975 ide_tape_flush_merge_buffer(drive);
1976 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
1977 if (tape->merge_bh != NULL) {
1978 idetape_pad_zeros(drive, tape->blk_size *
1979 (tape->user_bs_factor - 1));
1980 ide_tape_kfree_buffer(tape);
1981 tape->merge_bh = NULL;
1983 idetape_write_filemark(drive);
1984 idetape_flush_tape_buffers(drive);
1985 idetape_flush_tape_buffers(drive);
1988 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1990 struct ide_tape_obj *tape = filp->private_data;
1991 ide_drive_t *drive = tape->drive;
1992 unsigned int minor = iminor(inode);
1995 tape = drive->driver_data;
1997 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1999 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2000 idetape_write_release(drive, minor);
2001 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2003 ide_tape_discard_merge_buffer(drive, 1);
2006 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2007 (void) idetape_rewind_tape(drive);
2008 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2009 if (tape->door_locked == DOOR_LOCKED) {
2010 if (!ide_set_media_lock(drive, tape->disk, 0))
2011 tape->door_locked = DOOR_UNLOCKED;
2014 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2020 static void idetape_get_inquiry_results(ide_drive_t *drive)
2022 idetape_tape_t *tape = drive->driver_data;
2023 struct ide_atapi_pc pc;
2024 char fw_rev[4], vendor_id[8], product_id[16];
2026 idetape_create_inquiry_cmd(&pc);
2027 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2028 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2032 memcpy(vendor_id, &pc.buf[8], 8);
2033 memcpy(product_id, &pc.buf[16], 16);
2034 memcpy(fw_rev, &pc.buf[32], 4);
2036 ide_fixstring(vendor_id, 8, 0);
2037 ide_fixstring(product_id, 16, 0);
2038 ide_fixstring(fw_rev, 4, 0);
2040 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2041 drive->name, tape->name, vendor_id, product_id, fw_rev);
2045 * Ask the tape about its various parameters. In particular, we will adjust our
2046 * data transfer buffer size to the recommended value as returned by the tape.
2048 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2050 idetape_tape_t *tape = drive->driver_data;
2051 struct ide_atapi_pc pc;
2053 u8 speed, max_speed;
2055 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2056 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2057 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2058 " some default values\n");
2059 tape->blk_size = 512;
2060 put_unaligned(52, (u16 *)&tape->caps[12]);
2061 put_unaligned(540, (u16 *)&tape->caps[14]);
2062 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2065 caps = pc.buf + 4 + pc.buf[3];
2067 /* convert to host order and save for later use */
2068 speed = be16_to_cpup((__be16 *)&caps[14]);
2069 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2071 *(u16 *)&caps[8] = max_speed;
2072 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2073 *(u16 *)&caps[14] = speed;
2074 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2077 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2078 "(assuming 650KB/sec)\n", drive->name);
2079 *(u16 *)&caps[14] = 650;
2082 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2083 "(assuming 650KB/sec)\n", drive->name);
2084 *(u16 *)&caps[8] = 650;
2087 memcpy(&tape->caps, caps, 20);
2089 /* device lacks locking support according to capabilities page */
2090 if ((caps[6] & 1) == 0)
2091 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
2094 tape->blk_size = 512;
2095 else if (caps[7] & 0x04)
2096 tape->blk_size = 1024;
2099 #ifdef CONFIG_IDE_PROC_FS
2100 #define ide_tape_devset_get(name, field) \
2101 static int get_##name(ide_drive_t *drive) \
2103 idetape_tape_t *tape = drive->driver_data; \
2104 return tape->field; \
2107 #define ide_tape_devset_set(name, field) \
2108 static int set_##name(ide_drive_t *drive, int arg) \
2110 idetape_tape_t *tape = drive->driver_data; \
2111 tape->field = arg; \
2115 #define ide_tape_devset_rw_field(_name, _field) \
2116 ide_tape_devset_get(_name, _field) \
2117 ide_tape_devset_set(_name, _field) \
2118 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2120 #define ide_tape_devset_r_field(_name, _field) \
2121 ide_tape_devset_get(_name, _field) \
2122 IDE_DEVSET(_name, 0, get_##_name, NULL)
2124 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2125 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2126 static int divf_buffer(ide_drive_t *drive) { return 2; }
2127 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2129 ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
2131 ide_tape_devset_rw_field(debug_mask, debug_mask);
2132 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2134 ide_tape_devset_r_field(avg_speed, avg_speed);
2135 ide_tape_devset_r_field(speed, caps[14]);
2136 ide_tape_devset_r_field(buffer, caps[16]);
2137 ide_tape_devset_r_field(buffer_size, buffer_size);
2139 static const struct ide_proc_devset idetape_settings[] = {
2140 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2141 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2142 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2143 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2144 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2145 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2146 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2147 mulf_tdsc, divf_tdsc),
2153 * The function below is called to:
2155 * 1. Initialize our various state variables.
2156 * 2. Ask the tape for its capabilities.
2157 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2158 * is chosen based on the recommendation which we received in step 2.
2160 * Note that at this point ide.c already assigned us an irq, so that we can
2161 * queue requests here and wait for their completion.
2163 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2168 u16 *ctl = (u16 *)&tape->caps[12];
2170 drive->pc_callback = ide_tape_callback;
2171 drive->pc_update_buffers = idetape_update_buffers;
2172 drive->pc_io_buffers = ide_tape_io_buffers;
2174 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
2176 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2177 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2179 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2182 /* Seagate Travan drives do not support DSC overlap. */
2183 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2184 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2186 tape->minor = minor;
2187 tape->name[0] = 'h';
2188 tape->name[1] = 't';
2189 tape->name[2] = '0' + minor;
2190 tape->chrdev_dir = IDETAPE_DIR_NONE;
2192 idetape_get_inquiry_results(drive);
2193 idetape_get_mode_sense_results(drive);
2194 ide_tape_get_bsize_from_bdesc(drive);
2195 tape->user_bs_factor = 1;
2196 tape->buffer_size = *ctl * tape->blk_size;
2197 while (tape->buffer_size > 0xffff) {
2198 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2200 tape->buffer_size = *ctl * tape->blk_size;
2202 buffer_size = tape->buffer_size;
2203 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2204 if (buffer_size % PAGE_SIZE) {
2205 tape->pages_per_buffer++;
2206 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2209 /* select the "best" DSC read/write polling freq */
2210 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2212 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2215 * Ensure that the number we got makes sense; limit it within
2216 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2218 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2219 IDETAPE_DSC_RW_MAX);
2220 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2222 drive->name, tape->name, *(u16 *)&tape->caps[14],
2223 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2224 tape->buffer_size / 1024,
2225 tape->best_dsc_rw_freq * 1000 / HZ,
2226 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
2228 ide_proc_register_driver(drive, tape->driver);
2231 static void ide_tape_remove(ide_drive_t *drive)
2233 idetape_tape_t *tape = drive->driver_data;
2235 ide_proc_unregister_driver(drive, tape->driver);
2236 device_del(&tape->dev);
2237 ide_unregister_region(tape->disk);
2239 mutex_lock(&idetape_ref_mutex);
2240 put_device(&tape->dev);
2241 mutex_unlock(&idetape_ref_mutex);
2244 static void ide_tape_release(struct device *dev)
2246 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
2247 ide_drive_t *drive = tape->drive;
2248 struct gendisk *g = tape->disk;
2250 BUG_ON(tape->merge_bh_size);
2252 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2253 drive->driver_data = NULL;
2254 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2255 device_destroy(idetape_sysfs_class,
2256 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2257 idetape_devs[tape->minor] = NULL;
2258 g->private_data = NULL;
2263 #ifdef CONFIG_IDE_PROC_FS
2264 static int proc_idetape_read_name
2265 (char *page, char **start, off_t off, int count, int *eof, void *data)
2267 ide_drive_t *drive = (ide_drive_t *) data;
2268 idetape_tape_t *tape = drive->driver_data;
2272 len = sprintf(out, "%s\n", tape->name);
2273 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2276 static ide_proc_entry_t idetape_proc[] = {
2277 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2278 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2279 { NULL, 0, NULL, NULL }
2282 static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
2284 return idetape_proc;
2287 static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
2289 return idetape_settings;
2293 static int ide_tape_probe(ide_drive_t *);
2295 static struct ide_driver idetape_driver = {
2297 .owner = THIS_MODULE,
2299 .bus = &ide_bus_type,
2301 .probe = ide_tape_probe,
2302 .remove = ide_tape_remove,
2303 .version = IDETAPE_VERSION,
2304 .do_request = idetape_do_request,
2305 .end_request = idetape_end_request,
2306 #ifdef CONFIG_IDE_PROC_FS
2307 .proc_entries = ide_tape_proc_entries,
2308 .proc_devsets = ide_tape_proc_devsets,
2312 /* Our character device supporting functions, passed to register_chrdev. */
2313 static const struct file_operations idetape_fops = {
2314 .owner = THIS_MODULE,
2315 .read = idetape_chrdev_read,
2316 .write = idetape_chrdev_write,
2317 .ioctl = idetape_chrdev_ioctl,
2318 .open = idetape_chrdev_open,
2319 .release = idetape_chrdev_release,
2322 static int idetape_open(struct block_device *bdev, fmode_t mode)
2324 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
2332 static int idetape_release(struct gendisk *disk, fmode_t mode)
2334 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
2340 static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
2341 unsigned int cmd, unsigned long arg)
2343 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
2344 ide_drive_t *drive = tape->drive;
2345 int err = generic_ide_ioctl(drive, bdev, cmd, arg);
2347 err = idetape_blkdev_ioctl(drive, cmd, arg);
2351 static struct block_device_operations idetape_block_ops = {
2352 .owner = THIS_MODULE,
2353 .open = idetape_open,
2354 .release = idetape_release,
2355 .locked_ioctl = idetape_ioctl,
2358 static int ide_tape_probe(ide_drive_t *drive)
2360 idetape_tape_t *tape;
2364 if (!strstr("ide-tape", drive->driver_req))
2367 if (drive->media != ide_tape)
2370 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
2371 ide_check_atapi_device(drive, DRV_NAME) == 0) {
2372 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2373 " the driver\n", drive->name);
2376 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2378 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2383 g = alloc_disk(1 << PARTN_BITS);
2387 ide_init_disk(g, drive);
2389 tape->dev.parent = &drive->gendev;
2390 tape->dev.release = ide_tape_release;
2391 dev_set_name(&tape->dev, dev_name(&drive->gendev));
2393 if (device_register(&tape->dev))
2396 tape->drive = drive;
2397 tape->driver = &idetape_driver;
2400 g->private_data = &tape->driver;
2402 drive->driver_data = tape;
2404 mutex_lock(&idetape_ref_mutex);
2405 for (minor = 0; idetape_devs[minor]; minor++)
2407 idetape_devs[minor] = tape;
2408 mutex_unlock(&idetape_ref_mutex);
2410 idetape_setup(drive, tape, minor);
2412 device_create(idetape_sysfs_class, &drive->gendev,
2413 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2414 device_create(idetape_sysfs_class, &drive->gendev,
2415 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2418 g->fops = &idetape_block_ops;
2419 ide_register_region(g);
2431 static void __exit idetape_exit(void)
2433 driver_unregister(&idetape_driver.gen_driver);
2434 class_destroy(idetape_sysfs_class);
2435 unregister_chrdev(IDETAPE_MAJOR, "ht");
2438 static int __init idetape_init(void)
2441 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2442 if (IS_ERR(idetape_sysfs_class)) {
2443 idetape_sysfs_class = NULL;
2444 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2449 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2450 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2453 goto out_free_class;
2456 error = driver_register(&idetape_driver.gen_driver);
2458 goto out_free_driver;
2463 driver_unregister(&idetape_driver.gen_driver);
2465 class_destroy(idetape_sysfs_class);
2470 MODULE_ALIAS("ide:*m-tape*");
2471 module_init(idetape_init);
2472 module_exit(idetape_exit);
2473 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2474 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2475 MODULE_LICENSE("GPL");