2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV = (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE = (1 << 0),
130 IDETAPE_DIR_READ = (1 << 1),
131 IDETAPE_DIR_WRITE = (1 << 2),
137 struct idetape_bh *b_reqnext;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Error codes returned in rq->errors to the higher part of the driver. */
156 #define IDETAPE_ERROR_GENERAL 101
157 #define IDETAPE_ERROR_FILEMARK 102
158 #define IDETAPE_ERROR_EOD 103
160 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
161 #define IDETAPE_BLOCK_DESCRIPTOR 0
162 #define IDETAPE_CAPABILITIES_PAGE 0x2a
165 * Most of our global data which we need to save even as we leave the driver due
166 * to an interrupt or a timer event is stored in the struct defined below.
168 typedef struct ide_tape_obj {
170 ide_driver_t *driver;
171 struct gendisk *disk;
175 * failed_pc points to the last failed packet command, or contains
176 * NULL if we do not need to retry any packet command. This is
177 * required since an additional packet command is needed before the
178 * retry, to get detailed information on what went wrong.
180 /* Last failed packet command */
181 struct ide_atapi_pc *failed_pc;
182 /* used by REQ_IDETAPE_{READ,WRITE} requests */
183 struct ide_atapi_pc queued_pc;
185 struct ide_atapi_pc request_sense_pc;
186 struct request request_sense_rq;
189 * DSC polling variables.
191 * While polling for DSC we use postponed_rq to postpone the current
192 * request so that ide.c will be able to service pending requests on the
193 * other device. Note that at most we will have only one DSC (usually
194 * data transfer) request in the device request queue.
196 struct request *postponed_rq;
197 /* The time in which we started polling for DSC */
198 unsigned long dsc_polling_start;
199 /* Timer used to poll for dsc */
200 struct timer_list dsc_timer;
201 /* Read/Write dsc polling frequency */
202 unsigned long best_dsc_rw_freq;
203 unsigned long dsc_poll_freq;
204 unsigned long dsc_timeout;
206 /* Read position information */
209 unsigned int first_frame;
211 /* Last error information */
212 u8 sense_key, asc, ascq;
214 /* Character device operation */
218 /* Current character device data transfer direction */
221 /* tape block size, usually 512 or 1024 bytes */
222 unsigned short blk_size;
225 /* Copy of the tape's Capabilities and Mechanical Page */
229 * Active data transfer request parameters.
231 * At most, there is only one ide-tape originated data transfer request
232 * in the device request queue. This allows ide.c to easily service
233 * requests from the other device when we postpone our active request.
236 /* Data buffer size chosen based on the tape's recommendation */
239 struct idetape_bh *merge_bh;
240 /* size of the merge buffer */
242 /* pointer to current buffer head within the merge buffer */
243 struct idetape_bh *bh;
247 int pages_per_buffer;
248 /* Wasted space in each stage */
251 /* protects the ide-tape queue */
254 /* Measures average tape speed */
255 unsigned long avg_time;
259 /* the door is currently locked */
261 /* the tape hardware is write protected */
263 /* the tape is write protected (hardware or opened as read-only) */
269 static DEFINE_MUTEX(idetape_ref_mutex);
271 static struct class *idetape_sysfs_class;
273 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
275 #define ide_tape_g(disk) \
276 container_of((disk)->private_data, struct ide_tape_obj, driver)
278 static void ide_tape_release(struct kref *);
280 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
282 struct ide_tape_obj *tape = NULL;
284 mutex_lock(&idetape_ref_mutex);
285 tape = ide_tape_g(disk);
287 if (ide_device_get(tape->drive))
290 kref_get(&tape->kref);
292 mutex_unlock(&idetape_ref_mutex);
296 static void ide_tape_put(struct ide_tape_obj *tape)
298 ide_drive_t *drive = tape->drive;
300 mutex_lock(&idetape_ref_mutex);
301 kref_put(&tape->kref, ide_tape_release);
302 ide_device_put(drive);
303 mutex_unlock(&idetape_ref_mutex);
307 * The variables below are used for the character device interface. Additional
308 * state variables are defined in our ide_drive_t structure.
310 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
312 #define ide_tape_f(file) ((file)->private_data)
314 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
316 struct ide_tape_obj *tape = NULL;
318 mutex_lock(&idetape_ref_mutex);
319 tape = idetape_devs[i];
321 kref_get(&tape->kref);
322 mutex_unlock(&idetape_ref_mutex);
326 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
329 struct idetape_bh *bh = pc->bh;
334 printk(KERN_ERR "ide-tape: bh == NULL in "
335 "idetape_input_buffers\n");
336 ide_pad_transfer(drive, 0, bcount);
340 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
342 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
343 atomic_read(&bh->b_count), count);
345 atomic_add(count, &bh->b_count);
346 if (atomic_read(&bh->b_count) == bh->b_size) {
349 atomic_set(&bh->b_count, 0);
355 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
358 struct idetape_bh *bh = pc->bh;
363 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
367 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
368 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
371 pc->b_count -= count;
376 pc->b_data = bh->b_data;
377 pc->b_count = atomic_read(&bh->b_count);
383 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
385 struct idetape_bh *bh = pc->bh;
387 unsigned int bcount = pc->xferred;
389 if (pc->flags & PC_FLAG_WRITING)
393 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
397 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
398 atomic_set(&bh->b_count, count);
399 if (atomic_read(&bh->b_count) == bh->b_size)
407 * called on each failed packet command retry to analyze the request sense. We
408 * currently do not utilize this information.
410 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
412 idetape_tape_t *tape = drive->driver_data;
413 struct ide_atapi_pc *pc = tape->failed_pc;
415 tape->sense_key = sense[2] & 0xF;
416 tape->asc = sense[12];
417 tape->ascq = sense[13];
419 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
420 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
422 /* Correct pc->xferred by asking the tape. */
423 if (pc->flags & PC_FLAG_DMA_ERROR) {
424 pc->xferred = pc->req_xfer -
426 get_unaligned_be32(&sense[3]);
427 idetape_update_buffers(drive, pc);
431 * If error was the result of a zero-length read or write command,
432 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
433 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
435 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
437 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
438 if (tape->sense_key == 5) {
439 /* don't report an error, everything's ok */
441 /* don't retry read/write */
442 pc->flags |= PC_FLAG_ABORT;
445 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
446 pc->error = IDETAPE_ERROR_FILEMARK;
447 pc->flags |= PC_FLAG_ABORT;
449 if (pc->c[0] == WRITE_6) {
450 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
451 && tape->asc == 0x0 && tape->ascq == 0x2)) {
452 pc->error = IDETAPE_ERROR_EOD;
453 pc->flags |= PC_FLAG_ABORT;
456 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
457 if (tape->sense_key == 8) {
458 pc->error = IDETAPE_ERROR_EOD;
459 pc->flags |= PC_FLAG_ABORT;
461 if (!(pc->flags & PC_FLAG_ABORT) &&
463 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
467 /* Free data buffers completely. */
468 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
470 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
473 u32 size = bh->b_size;
476 unsigned int order = fls(size >> PAGE_SHIFT)-1;
479 free_pages((unsigned long)bh->b_data, order);
482 bh->b_data += (1 << order) * PAGE_SIZE;
490 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
492 struct request *rq = HWGROUP(drive)->rq;
493 idetape_tape_t *tape = drive->driver_data;
497 debug_log(DBG_PROCS, "Enter %s\n", __func__);
500 case 0: error = IDETAPE_ERROR_GENERAL; break;
501 case 1: error = 0; break;
502 default: error = uptodate;
506 tape->failed_pc = NULL;
508 if (!blk_special_request(rq)) {
509 ide_end_request(drive, uptodate, nr_sects);
513 spin_lock_irqsave(&tape->lock, flags);
515 ide_end_drive_cmd(drive, 0, 0);
517 spin_unlock_irqrestore(&tape->lock, flags);
521 static void ide_tape_handle_dsc(ide_drive_t *);
523 static void ide_tape_callback(ide_drive_t *drive, int dsc)
525 idetape_tape_t *tape = drive->driver_data;
526 struct ide_atapi_pc *pc = drive->pc;
527 int uptodate = pc->error ? 0 : 1;
529 debug_log(DBG_PROCS, "Enter %s\n", __func__);
532 ide_tape_handle_dsc(drive);
534 if (tape->failed_pc == pc)
535 tape->failed_pc = NULL;
537 if (pc->c[0] == REQUEST_SENSE) {
539 idetape_analyze_error(drive, pc->buf);
541 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
542 "itself - Aborting request!\n");
543 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
544 struct request *rq = drive->hwif->hwgroup->rq;
545 int blocks = pc->xferred / tape->blk_size;
547 tape->avg_size += blocks * tape->blk_size;
549 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
550 tape->avg_speed = tape->avg_size * HZ /
551 (jiffies - tape->avg_time) / 1024;
553 tape->avg_time = jiffies;
556 tape->first_frame += blocks;
557 rq->current_nr_sectors -= blocks;
560 uptodate = pc->error;
561 } else if (pc->c[0] == READ_POSITION && uptodate) {
562 u8 *readpos = pc->buf;
564 debug_log(DBG_SENSE, "BOP - %s\n",
565 (readpos[0] & 0x80) ? "Yes" : "No");
566 debug_log(DBG_SENSE, "EOP - %s\n",
567 (readpos[0] & 0x40) ? "Yes" : "No");
569 if (readpos[0] & 0x4) {
570 printk(KERN_INFO "ide-tape: Block location is unknown"
572 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
575 debug_log(DBG_SENSE, "Block Location - %u\n",
576 be32_to_cpup((__be32 *)&readpos[4]));
578 tape->partition = readpos[1];
579 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
580 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
584 idetape_end_request(drive, uptodate, 0);
587 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
590 pc->c[0] = REQUEST_SENSE;
596 * idetape_retry_pc is called when an error was detected during the
597 * last packet command. We queue a request sense packet command in
598 * the head of the request list.
600 static void idetape_retry_pc(ide_drive_t *drive)
602 struct ide_tape_obj *tape = drive->driver_data;
603 struct request *rq = &tape->request_sense_rq;
604 struct ide_atapi_pc *pc = &tape->request_sense_pc;
606 (void)ide_read_error(drive);
607 idetape_create_request_sense_cmd(pc);
608 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
609 ide_queue_pc_head(drive, tape->disk, pc, rq);
613 * Postpone the current request so that ide.c will be able to service requests
614 * from another device on the same hwgroup while we are polling for DSC.
616 static void idetape_postpone_request(ide_drive_t *drive)
618 idetape_tape_t *tape = drive->driver_data;
620 debug_log(DBG_PROCS, "Enter %s\n", __func__);
622 tape->postponed_rq = HWGROUP(drive)->rq;
623 ide_stall_queue(drive, tape->dsc_poll_freq);
626 static void ide_tape_handle_dsc(ide_drive_t *drive)
628 idetape_tape_t *tape = drive->driver_data;
630 /* Media access command */
631 tape->dsc_polling_start = jiffies;
632 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
633 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
634 /* Allow ide.c to handle other requests */
635 idetape_postpone_request(drive);
638 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
639 unsigned int bcount, int write)
642 idetape_output_buffers(drive, pc, bcount);
644 idetape_input_buffers(drive, pc, bcount);
650 * This is the usual interrupt handler which will be called during a packet
651 * command. We will transfer some of the data (as requested by the drive) and
652 * will re-point interrupt handler to us. When data transfer is finished, we
653 * will act according to the algorithm described before
656 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
658 return ide_pc_intr(drive, idetape_pc_intr, idetape_update_buffers,
659 idetape_retry_pc, ide_tape_io_buffers);
663 * Packet Command Interface
665 * The current Packet Command is available in drive->pc, and will not change
666 * until we finish handling it. Each packet command is associated with a
667 * callback function that will be called when the command is finished.
669 * The handling will be done in three stages:
671 * 1. idetape_issue_pc will send the packet command to the drive, and will set
672 * the interrupt handler to idetape_pc_intr.
674 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
675 * repeated until the device signals us that no more interrupts will be issued.
677 * 3. ATAPI Tape media access commands have immediate status with a delayed
678 * process. In case of a successful initiation of a media access packet command,
679 * the DSC bit will be set when the actual execution of the command is finished.
680 * Since the tape drive will not issue an interrupt, we have to poll for this
681 * event. In this case, we define the request as "low priority request" by
682 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
685 * ide.c will then give higher priority to requests which originate from the
686 * other device, until will change rq_status to RQ_ACTIVE.
688 * 4. When the packet command is finished, it will be checked for errors.
690 * 5. In case an error was found, we queue a request sense packet command in
691 * front of the request queue and retry the operation up to
692 * IDETAPE_MAX_PC_RETRIES times.
694 * 6. In case no error was found, or we decided to give up and not to retry
695 * again, the callback function will be called and then we will handle the next
698 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
700 return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL);
703 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
704 struct ide_atapi_pc *pc)
706 idetape_tape_t *tape = drive->driver_data;
708 if (drive->pc->c[0] == REQUEST_SENSE &&
709 pc->c[0] == REQUEST_SENSE) {
710 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
711 "Two request sense in serial were issued\n");
714 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
715 tape->failed_pc = pc;
717 /* Set the current packet command */
720 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
721 (pc->flags & PC_FLAG_ABORT)) {
723 * We will "abort" retrying a packet command in case legitimate
724 * error code was received (crossing a filemark, or end of the
725 * media, for example).
727 if (!(pc->flags & PC_FLAG_ABORT)) {
728 if (!(pc->c[0] == TEST_UNIT_READY &&
729 tape->sense_key == 2 && tape->asc == 4 &&
730 (tape->ascq == 1 || tape->ascq == 8))) {
731 printk(KERN_ERR "ide-tape: %s: I/O error, "
732 "pc = %2x, key = %2x, "
733 "asc = %2x, ascq = %2x\n",
734 tape->name, pc->c[0],
735 tape->sense_key, tape->asc,
739 pc->error = IDETAPE_ERROR_GENERAL;
741 tape->failed_pc = NULL;
742 drive->pc_callback(drive, 0);
745 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
749 return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
752 /* A mode sense command is used to "sense" tape parameters. */
753 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
756 pc->c[0] = MODE_SENSE;
757 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
758 /* DBD = 1 - Don't return block descriptors */
760 pc->c[2] = page_code;
762 * Changed pc->c[3] to 0 (255 will at best return unused info).
764 * For SCSI this byte is defined as subpage instead of high byte
765 * of length and some IDE drives seem to interpret it this way
766 * and return an error when 255 is used.
769 /* We will just discard data in that case */
771 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
773 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
779 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
781 ide_hwif_t *hwif = drive->hwif;
782 idetape_tape_t *tape = drive->driver_data;
783 struct ide_atapi_pc *pc = drive->pc;
786 stat = hwif->tp_ops->read_status(hwif);
788 if (stat & ATA_DSC) {
789 if (stat & ATA_ERR) {
791 if (pc->c[0] != TEST_UNIT_READY)
792 printk(KERN_ERR "ide-tape: %s: I/O error, ",
794 /* Retry operation */
795 idetape_retry_pc(drive);
800 pc->error = IDETAPE_ERROR_GENERAL;
801 tape->failed_pc = NULL;
803 drive->pc_callback(drive, 0);
807 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
808 struct ide_atapi_pc *pc, struct request *rq,
811 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
812 unsigned int length = rq->current_nr_sectors;
815 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
819 pc->buf_size = length * tape->blk_size;
820 pc->req_xfer = pc->buf_size;
821 if (pc->req_xfer == tape->buffer_size)
822 pc->flags |= PC_FLAG_DMA_OK;
824 if (opcode == READ_6) {
826 atomic_set(&bh->b_count, 0);
827 } else if (opcode == WRITE_6) {
829 pc->flags |= PC_FLAG_WRITING;
830 pc->b_data = bh->b_data;
831 pc->b_count = atomic_read(&bh->b_count);
834 memcpy(rq->cmd, pc->c, 12);
837 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
838 struct request *rq, sector_t block)
840 ide_hwif_t *hwif = drive->hwif;
841 idetape_tape_t *tape = drive->driver_data;
842 struct ide_atapi_pc *pc = NULL;
843 struct request *postponed_rq = tape->postponed_rq;
846 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
847 " current_nr_sectors: %u\n",
848 (unsigned long long)rq->sector, rq->nr_sectors,
849 rq->current_nr_sectors);
851 if (!blk_special_request(rq)) {
852 /* We do not support buffer cache originated requests. */
853 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
854 "request queue (%d)\n", drive->name, rq->cmd_type);
855 ide_end_request(drive, 0, 0);
859 /* Retry a failed packet command */
860 if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
861 pc = tape->failed_pc;
865 if (postponed_rq != NULL)
866 if (rq != postponed_rq) {
867 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
868 "Two DSC requests were queued\n");
869 idetape_end_request(drive, 0, 0);
873 tape->postponed_rq = NULL;
876 * If the tape is still busy, postpone our request and service
877 * the other device meanwhile.
879 stat = hwif->tp_ops->read_status(hwif);
881 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
882 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
884 if (drive->post_reset == 1) {
885 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
886 drive->post_reset = 0;
889 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
890 (stat & ATA_DSC) == 0) {
891 if (postponed_rq == NULL) {
892 tape->dsc_polling_start = jiffies;
893 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
894 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
895 } else if (time_after(jiffies, tape->dsc_timeout)) {
896 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
898 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
899 idetape_media_access_finished(drive);
902 return ide_do_reset(drive);
904 } else if (time_after(jiffies,
905 tape->dsc_polling_start +
906 IDETAPE_DSC_MA_THRESHOLD))
907 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
908 idetape_postpone_request(drive);
911 if (rq->cmd[13] & REQ_IDETAPE_READ) {
912 pc = &tape->queued_pc;
913 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
916 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
917 pc = &tape->queued_pc;
918 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
921 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
922 pc = (struct ide_atapi_pc *) rq->buffer;
923 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
924 rq->cmd[13] |= REQ_IDETAPE_PC2;
927 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
928 idetape_media_access_finished(drive);
934 return idetape_issue_pc(drive, pc);
938 * The function below uses __get_free_pages to allocate a data buffer of size
939 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
942 * It returns a pointer to the newly allocated buffer, or NULL in case of
945 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
948 struct idetape_bh *prev_bh, *bh, *merge_bh;
949 int pages = tape->pages_per_buffer;
950 unsigned int order, b_allocd;
953 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
958 order = fls(pages) - 1;
959 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
962 b_allocd = (1 << order) * PAGE_SIZE;
966 memset(bh->b_data, 0, b_allocd);
967 bh->b_reqnext = NULL;
968 bh->b_size = b_allocd;
969 atomic_set(&bh->b_count, full ? bh->b_size : 0);
972 order = fls(pages) - 1;
973 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
976 b_allocd = (1 << order) * PAGE_SIZE;
979 memset(b_data, 0, b_allocd);
981 /* newly allocated page frames below buffer header or ...*/
982 if (bh->b_data == b_data + b_allocd) {
983 bh->b_size += b_allocd;
984 bh->b_data -= b_allocd;
986 atomic_add(b_allocd, &bh->b_count);
989 /* they are above the header */
990 if (b_data == bh->b_data + bh->b_size) {
991 bh->b_size += b_allocd;
993 atomic_add(b_allocd, &bh->b_count);
997 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
999 free_pages((unsigned long) b_data, order);
1002 bh->b_reqnext = NULL;
1003 bh->b_data = b_data;
1004 bh->b_size = b_allocd;
1005 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1006 prev_bh->b_reqnext = bh;
1011 bh->b_size -= tape->excess_bh_size;
1013 atomic_sub(tape->excess_bh_size, &bh->b_count);
1016 ide_tape_kfree_buffer(tape);
1020 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1021 const char __user *buf, int n)
1023 struct idetape_bh *bh = tape->bh;
1029 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1033 count = min((unsigned int)
1034 (bh->b_size - atomic_read(&bh->b_count)),
1036 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1040 atomic_add(count, &bh->b_count);
1042 if (atomic_read(&bh->b_count) == bh->b_size) {
1045 atomic_set(&bh->b_count, 0);
1052 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1055 struct idetape_bh *bh = tape->bh;
1061 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1065 count = min(tape->b_count, n);
1066 if (copy_to_user(buf, tape->b_data, count))
1069 tape->b_data += count;
1070 tape->b_count -= count;
1072 if (!tape->b_count) {
1076 tape->b_data = bh->b_data;
1077 tape->b_count = atomic_read(&bh->b_count);
1084 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1086 struct idetape_bh *bh = tape->merge_bh;
1087 tape->bh = tape->merge_bh;
1089 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1090 atomic_set(&bh->b_count, 0);
1092 tape->b_data = bh->b_data;
1093 tape->b_count = atomic_read(&bh->b_count);
1098 * Write a filemark if write_filemark=1. Flush the device buffers without
1099 * writing a filemark otherwise.
1101 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1102 struct ide_atapi_pc *pc, int write_filemark)
1105 pc->c[0] = WRITE_FILEMARKS;
1106 pc->c[4] = write_filemark;
1107 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1110 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1112 idetape_tape_t *tape = drive->driver_data;
1113 struct gendisk *disk = tape->disk;
1114 int load_attempted = 0;
1116 /* Wait for the tape to become ready */
1117 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1119 while (time_before(jiffies, timeout)) {
1120 if (ide_do_test_unit_ready(drive, disk) == 0)
1122 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1123 || (tape->asc == 0x3A)) {
1127 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1129 /* not about to be ready */
1130 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1131 (tape->ascq == 1 || tape->ascq == 8)))
1138 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1140 struct ide_tape_obj *tape = drive->driver_data;
1141 struct ide_atapi_pc pc;
1144 idetape_create_write_filemark_cmd(drive, &pc, 0);
1145 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1148 idetape_wait_ready(drive, 60 * 5 * HZ);
1152 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1155 pc->c[0] = READ_POSITION;
1159 static int idetape_read_position(ide_drive_t *drive)
1161 idetape_tape_t *tape = drive->driver_data;
1162 struct ide_atapi_pc pc;
1165 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1167 idetape_create_read_position_cmd(&pc);
1168 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1170 position = tape->first_frame;
1174 static void idetape_create_locate_cmd(ide_drive_t *drive,
1175 struct ide_atapi_pc *pc,
1176 unsigned int block, u8 partition, int skip)
1179 pc->c[0] = POSITION_TO_ELEMENT;
1181 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1182 pc->c[8] = partition;
1183 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1186 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1188 idetape_tape_t *tape = drive->driver_data;
1190 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1193 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1194 tape->merge_bh_size = 0;
1195 if (tape->merge_bh != NULL) {
1196 ide_tape_kfree_buffer(tape);
1197 tape->merge_bh = NULL;
1200 tape->chrdev_dir = IDETAPE_DIR_NONE;
1204 * Position the tape to the requested block using the LOCATE packet command.
1205 * A READ POSITION command is then issued to check where we are positioned. Like
1206 * all higher level operations, we queue the commands at the tail of the request
1207 * queue and wait for their completion.
1209 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1210 u8 partition, int skip)
1212 idetape_tape_t *tape = drive->driver_data;
1213 struct gendisk *disk = tape->disk;
1215 struct ide_atapi_pc pc;
1217 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1218 __ide_tape_discard_merge_buffer(drive);
1219 idetape_wait_ready(drive, 60 * 5 * HZ);
1220 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1221 retval = ide_queue_pc_tail(drive, disk, &pc);
1225 idetape_create_read_position_cmd(&pc);
1226 return ide_queue_pc_tail(drive, disk, &pc);
1229 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1230 int restore_position)
1232 idetape_tape_t *tape = drive->driver_data;
1235 __ide_tape_discard_merge_buffer(drive);
1236 if (restore_position) {
1237 position = idetape_read_position(drive);
1238 seek = position > 0 ? position : 0;
1239 if (idetape_position_tape(drive, seek, 0, 0)) {
1240 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1241 " %s\n", tape->name, __func__);
1248 * Generate a read/write request for the block device interface and wait for it
1251 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1252 struct idetape_bh *bh)
1254 idetape_tape_t *tape = drive->driver_data;
1258 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1260 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1261 rq->cmd_type = REQ_TYPE_SPECIAL;
1263 rq->rq_disk = tape->disk;
1264 rq->special = (void *)bh;
1265 rq->sector = tape->first_frame;
1266 rq->nr_sectors = blocks;
1267 rq->current_nr_sectors = blocks;
1268 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1270 errors = rq->errors;
1271 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1272 blk_put_request(rq);
1274 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1278 idetape_init_merge_buffer(tape);
1279 if (errors == IDETAPE_ERROR_GENERAL)
1284 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1292 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1293 struct ide_atapi_pc *pc)
1296 pc->c[0] = REZERO_UNIT;
1297 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1300 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1305 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1308 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1312 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1314 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1317 /* Queue up a character device originated write request. */
1318 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1320 idetape_tape_t *tape = drive->driver_data;
1322 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1324 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1325 blocks, tape->merge_bh);
1328 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1330 idetape_tape_t *tape = drive->driver_data;
1332 struct idetape_bh *bh;
1334 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1335 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1336 " but we are not writing.\n");
1339 if (tape->merge_bh_size > tape->buffer_size) {
1340 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1341 tape->merge_bh_size = tape->buffer_size;
1343 if (tape->merge_bh_size) {
1344 blocks = tape->merge_bh_size / tape->blk_size;
1345 if (tape->merge_bh_size % tape->blk_size) {
1349 i = tape->blk_size - tape->merge_bh_size %
1351 bh = tape->bh->b_reqnext;
1353 atomic_set(&bh->b_count, 0);
1359 printk(KERN_INFO "ide-tape: bug,"
1363 min = min(i, (unsigned int)(bh->b_size -
1364 atomic_read(&bh->b_count)));
1365 memset(bh->b_data + atomic_read(&bh->b_count),
1367 atomic_add(min, &bh->b_count);
1372 (void) idetape_add_chrdev_write_request(drive, blocks);
1373 tape->merge_bh_size = 0;
1375 if (tape->merge_bh != NULL) {
1376 ide_tape_kfree_buffer(tape);
1377 tape->merge_bh = NULL;
1379 tape->chrdev_dir = IDETAPE_DIR_NONE;
1382 static int idetape_init_read(ide_drive_t *drive)
1384 idetape_tape_t *tape = drive->driver_data;
1387 /* Initialize read operation */
1388 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1389 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1390 ide_tape_flush_merge_buffer(drive);
1391 idetape_flush_tape_buffers(drive);
1393 if (tape->merge_bh || tape->merge_bh_size) {
1394 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1396 tape->merge_bh_size = 0;
1398 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1399 if (!tape->merge_bh)
1401 tape->chrdev_dir = IDETAPE_DIR_READ;
1404 * Issue a read 0 command to ensure that DSC handshake is
1405 * switched from completion mode to buffer available mode.
1406 * No point in issuing this if DSC overlap isn't supported, some
1407 * drives (Seagate STT3401A) will return an error.
1409 if (drive->dsc_overlap) {
1410 bytes_read = idetape_queue_rw_tail(drive,
1411 REQ_IDETAPE_READ, 0,
1413 if (bytes_read < 0) {
1414 ide_tape_kfree_buffer(tape);
1415 tape->merge_bh = NULL;
1416 tape->chrdev_dir = IDETAPE_DIR_NONE;
1425 /* called from idetape_chrdev_read() to service a chrdev read request. */
1426 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1428 idetape_tape_t *tape = drive->driver_data;
1430 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1432 /* If we are at a filemark, return a read length of 0 */
1433 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1436 idetape_init_read(drive);
1438 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1442 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1444 idetape_tape_t *tape = drive->driver_data;
1445 struct idetape_bh *bh;
1451 bh = tape->merge_bh;
1452 count = min(tape->buffer_size, bcount);
1454 blocks = count / tape->blk_size;
1456 atomic_set(&bh->b_count,
1457 min(count, (unsigned int)bh->b_size));
1458 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1459 count -= atomic_read(&bh->b_count);
1462 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1468 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1469 * currently support only one partition.
1471 static int idetape_rewind_tape(ide_drive_t *drive)
1473 struct ide_tape_obj *tape = drive->driver_data;
1474 struct gendisk *disk = tape->disk;
1476 struct ide_atapi_pc pc;
1478 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1480 idetape_create_rewind_cmd(drive, &pc);
1481 retval = ide_queue_pc_tail(drive, disk, &pc);
1485 idetape_create_read_position_cmd(&pc);
1486 retval = ide_queue_pc_tail(drive, disk, &pc);
1492 /* mtio.h compatible commands should be issued to the chrdev interface. */
1493 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1496 idetape_tape_t *tape = drive->driver_data;
1497 void __user *argp = (void __user *)arg;
1499 struct idetape_config {
1500 int dsc_rw_frequency;
1501 int dsc_media_access_frequency;
1505 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1509 if (copy_from_user(&config, argp, sizeof(config)))
1511 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1514 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1515 config.nr_stages = 1;
1516 if (copy_to_user(argp, &config, sizeof(config)))
1525 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1528 idetape_tape_t *tape = drive->driver_data;
1529 struct gendisk *disk = tape->disk;
1530 struct ide_atapi_pc pc;
1531 int retval, count = 0;
1532 int sprev = !!(tape->caps[4] & 0x20);
1536 if (MTBSF == mt_op || MTBSFM == mt_op) {
1539 mt_count = -mt_count;
1542 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1543 tape->merge_bh_size = 0;
1544 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1546 ide_tape_discard_merge_buffer(drive, 0);
1552 idetape_create_space_cmd(&pc, mt_count - count,
1553 IDETAPE_SPACE_OVER_FILEMARK);
1554 return ide_queue_pc_tail(drive, disk, &pc);
1559 retval = idetape_space_over_filemarks(drive, MTFSF,
1563 count = (MTBSFM == mt_op ? 1 : -1);
1564 return idetape_space_over_filemarks(drive, MTFSF, count);
1566 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1573 * Our character device read / write functions.
1575 * The tape is optimized to maximize throughput when it is transferring an
1576 * integral number of the "continuous transfer limit", which is a parameter of
1577 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1579 * As of version 1.3 of the driver, the character device provides an abstract
1580 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1581 * same backup/restore procedure is supported. The driver will internally
1582 * convert the requests to the recommended transfer unit, so that an unmatch
1583 * between the user's block size to the recommended size will only result in a
1584 * (slightly) increased driver overhead, but will no longer hit performance.
1585 * This is not applicable to Onstream.
1587 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1588 size_t count, loff_t *ppos)
1590 struct ide_tape_obj *tape = ide_tape_f(file);
1591 ide_drive_t *drive = tape->drive;
1592 ssize_t bytes_read, temp, actually_read = 0, rc;
1594 u16 ctl = *(u16 *)&tape->caps[12];
1596 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1598 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1599 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1600 if (count > tape->blk_size &&
1601 (count % tape->blk_size) == 0)
1602 tape->user_bs_factor = count / tape->blk_size;
1604 rc = idetape_init_read(drive);
1609 if (tape->merge_bh_size) {
1610 actually_read = min((unsigned int)(tape->merge_bh_size),
1611 (unsigned int)count);
1612 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1614 buf += actually_read;
1615 tape->merge_bh_size -= actually_read;
1616 count -= actually_read;
1618 while (count >= tape->buffer_size) {
1619 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1620 if (bytes_read <= 0)
1622 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1625 count -= bytes_read;
1626 actually_read += bytes_read;
1629 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1630 if (bytes_read <= 0)
1632 temp = min((unsigned long)count, (unsigned long)bytes_read);
1633 if (idetape_copy_stage_to_user(tape, buf, temp))
1635 actually_read += temp;
1636 tape->merge_bh_size = bytes_read-temp;
1639 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1640 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1642 idetape_space_over_filemarks(drive, MTFSF, 1);
1646 return ret ? ret : actually_read;
1649 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1650 size_t count, loff_t *ppos)
1652 struct ide_tape_obj *tape = ide_tape_f(file);
1653 ide_drive_t *drive = tape->drive;
1654 ssize_t actually_written = 0;
1656 u16 ctl = *(u16 *)&tape->caps[12];
1658 /* The drive is write protected. */
1659 if (tape->write_prot)
1662 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1664 /* Initialize write operation */
1665 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1666 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1667 ide_tape_discard_merge_buffer(drive, 1);
1668 if (tape->merge_bh || tape->merge_bh_size) {
1669 printk(KERN_ERR "ide-tape: merge_bh_size "
1670 "should be 0 now\n");
1671 tape->merge_bh_size = 0;
1673 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1674 if (!tape->merge_bh)
1676 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1677 idetape_init_merge_buffer(tape);
1680 * Issue a write 0 command to ensure that DSC handshake is
1681 * switched from completion mode to buffer available mode. No
1682 * point in issuing this if DSC overlap isn't supported, some
1683 * drives (Seagate STT3401A) will return an error.
1685 if (drive->dsc_overlap) {
1686 ssize_t retval = idetape_queue_rw_tail(drive,
1687 REQ_IDETAPE_WRITE, 0,
1690 ide_tape_kfree_buffer(tape);
1691 tape->merge_bh = NULL;
1692 tape->chrdev_dir = IDETAPE_DIR_NONE;
1699 if (tape->merge_bh_size) {
1700 if (tape->merge_bh_size >= tape->buffer_size) {
1701 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1702 tape->merge_bh_size = 0;
1704 actually_written = min((unsigned int)
1705 (tape->buffer_size - tape->merge_bh_size),
1706 (unsigned int)count);
1707 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1709 buf += actually_written;
1710 tape->merge_bh_size += actually_written;
1711 count -= actually_written;
1713 if (tape->merge_bh_size == tape->buffer_size) {
1715 tape->merge_bh_size = 0;
1716 retval = idetape_add_chrdev_write_request(drive, ctl);
1721 while (count >= tape->buffer_size) {
1723 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1725 buf += tape->buffer_size;
1726 count -= tape->buffer_size;
1727 retval = idetape_add_chrdev_write_request(drive, ctl);
1728 actually_written += tape->buffer_size;
1733 actually_written += count;
1734 if (idetape_copy_stage_from_user(tape, buf, count))
1736 tape->merge_bh_size += count;
1738 return ret ? ret : actually_written;
1741 static int idetape_write_filemark(ide_drive_t *drive)
1743 struct ide_tape_obj *tape = drive->driver_data;
1744 struct ide_atapi_pc pc;
1746 /* Write a filemark */
1747 idetape_create_write_filemark_cmd(drive, &pc, 1);
1748 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1749 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1756 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1759 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1760 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1761 * usually not supported.
1763 * The following commands are currently not supported:
1765 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1766 * MT_ST_WRITE_THRESHOLD.
1768 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1770 idetape_tape_t *tape = drive->driver_data;
1771 struct gendisk *disk = tape->disk;
1772 struct ide_atapi_pc pc;
1775 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1785 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1792 if (tape->write_prot)
1794 ide_tape_discard_merge_buffer(drive, 1);
1795 for (i = 0; i < mt_count; i++) {
1796 retval = idetape_write_filemark(drive);
1802 ide_tape_discard_merge_buffer(drive, 0);
1803 if (idetape_rewind_tape(drive))
1807 ide_tape_discard_merge_buffer(drive, 0);
1808 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1812 * If door is locked, attempt to unlock before
1813 * attempting to eject.
1815 if (tape->door_locked) {
1816 if (!ide_set_media_lock(drive, disk, 0))
1817 tape->door_locked = DOOR_UNLOCKED;
1819 ide_tape_discard_merge_buffer(drive, 0);
1820 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1822 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1825 ide_tape_discard_merge_buffer(drive, 0);
1826 return idetape_flush_tape_buffers(drive);
1828 ide_tape_discard_merge_buffer(drive, 0);
1829 return ide_do_start_stop(drive, disk,
1830 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1832 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1833 return ide_queue_pc_tail(drive, disk, &pc);
1835 (void)idetape_rewind_tape(drive);
1836 idetape_create_erase_cmd(&pc);
1837 return ide_queue_pc_tail(drive, disk, &pc);
1840 if (mt_count < tape->blk_size ||
1841 mt_count % tape->blk_size)
1843 tape->user_bs_factor = mt_count / tape->blk_size;
1844 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1846 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1849 ide_tape_discard_merge_buffer(drive, 0);
1850 return idetape_position_tape(drive,
1851 mt_count * tape->user_bs_factor, tape->partition, 0);
1853 ide_tape_discard_merge_buffer(drive, 0);
1854 return idetape_position_tape(drive, 0, mt_count, 0);
1858 retval = ide_set_media_lock(drive, disk, 1);
1861 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1864 retval = ide_set_media_lock(drive, disk, 0);
1867 tape->door_locked = DOOR_UNLOCKED;
1870 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1877 * Our character device ioctls. General mtio.h magnetic io commands are
1878 * supported here, and not in the corresponding block interface. Our own
1879 * ide-tape ioctls are supported on both interfaces.
1881 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1882 unsigned int cmd, unsigned long arg)
1884 struct ide_tape_obj *tape = ide_tape_f(file);
1885 ide_drive_t *drive = tape->drive;
1889 int block_offset = 0, position = tape->first_frame;
1890 void __user *argp = (void __user *)arg;
1892 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1894 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1895 ide_tape_flush_merge_buffer(drive);
1896 idetape_flush_tape_buffers(drive);
1898 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1899 block_offset = tape->merge_bh_size /
1900 (tape->blk_size * tape->user_bs_factor);
1901 position = idetape_read_position(drive);
1907 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1909 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1911 memset(&mtget, 0, sizeof(struct mtget));
1912 mtget.mt_type = MT_ISSCSI2;
1913 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1915 ((tape->blk_size * tape->user_bs_factor)
1916 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1918 if (tape->drv_write_prot)
1919 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1921 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1925 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1926 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1930 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1931 ide_tape_discard_merge_buffer(drive, 1);
1932 return idetape_blkdev_ioctl(drive, cmd, arg);
1937 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1938 * block size with the reported value.
1940 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1942 idetape_tape_t *tape = drive->driver_data;
1943 struct ide_atapi_pc pc;
1945 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1946 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1947 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1948 if (tape->blk_size == 0) {
1949 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1950 "block size, assuming 32k\n");
1951 tape->blk_size = 32768;
1955 tape->blk_size = (pc.buf[4 + 5] << 16) +
1956 (pc.buf[4 + 6] << 8) +
1958 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1961 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1963 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1965 idetape_tape_t *tape;
1968 if (i >= MAX_HWIFS * MAX_DRIVES)
1972 tape = ide_tape_chrdev_get(i);
1978 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1981 * We really want to do nonseekable_open(inode, filp); here, but some
1982 * versions of tar incorrectly call lseek on tapes and bail out if that
1983 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1985 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1987 drive = tape->drive;
1989 filp->private_data = tape;
1991 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1996 retval = idetape_wait_ready(drive, 60 * HZ);
1998 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1999 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2003 idetape_read_position(drive);
2004 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2005 (void)idetape_rewind_tape(drive);
2007 /* Read block size and write protect status from drive. */
2008 ide_tape_get_bsize_from_bdesc(drive);
2010 /* Set write protect flag if device is opened as read-only. */
2011 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2012 tape->write_prot = 1;
2014 tape->write_prot = tape->drv_write_prot;
2016 /* Make sure drive isn't write protected if user wants to write. */
2017 if (tape->write_prot) {
2018 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2019 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2020 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2026 /* Lock the tape drive door so user can't eject. */
2027 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2028 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2029 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2030 tape->door_locked = DOOR_LOCKED;
2042 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2044 idetape_tape_t *tape = drive->driver_data;
2046 ide_tape_flush_merge_buffer(drive);
2047 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2048 if (tape->merge_bh != NULL) {
2049 idetape_pad_zeros(drive, tape->blk_size *
2050 (tape->user_bs_factor - 1));
2051 ide_tape_kfree_buffer(tape);
2052 tape->merge_bh = NULL;
2054 idetape_write_filemark(drive);
2055 idetape_flush_tape_buffers(drive);
2056 idetape_flush_tape_buffers(drive);
2059 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2061 struct ide_tape_obj *tape = ide_tape_f(filp);
2062 ide_drive_t *drive = tape->drive;
2063 unsigned int minor = iminor(inode);
2066 tape = drive->driver_data;
2068 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2070 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2071 idetape_write_release(drive, minor);
2072 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2074 ide_tape_discard_merge_buffer(drive, 1);
2077 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2078 (void) idetape_rewind_tape(drive);
2079 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2080 if (tape->door_locked == DOOR_LOCKED) {
2081 if (!ide_set_media_lock(drive, tape->disk, 0))
2082 tape->door_locked = DOOR_UNLOCKED;
2085 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2091 static void idetape_get_inquiry_results(ide_drive_t *drive)
2093 idetape_tape_t *tape = drive->driver_data;
2094 struct ide_atapi_pc pc;
2095 char fw_rev[4], vendor_id[8], product_id[16];
2097 idetape_create_inquiry_cmd(&pc);
2098 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2099 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2103 memcpy(vendor_id, &pc.buf[8], 8);
2104 memcpy(product_id, &pc.buf[16], 16);
2105 memcpy(fw_rev, &pc.buf[32], 4);
2107 ide_fixstring(vendor_id, 8, 0);
2108 ide_fixstring(product_id, 16, 0);
2109 ide_fixstring(fw_rev, 4, 0);
2111 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2112 drive->name, tape->name, vendor_id, product_id, fw_rev);
2116 * Ask the tape about its various parameters. In particular, we will adjust our
2117 * data transfer buffer size to the recommended value as returned by the tape.
2119 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2121 idetape_tape_t *tape = drive->driver_data;
2122 struct ide_atapi_pc pc;
2124 u8 speed, max_speed;
2126 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2127 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2128 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2129 " some default values\n");
2130 tape->blk_size = 512;
2131 put_unaligned(52, (u16 *)&tape->caps[12]);
2132 put_unaligned(540, (u16 *)&tape->caps[14]);
2133 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2136 caps = pc.buf + 4 + pc.buf[3];
2138 /* convert to host order and save for later use */
2139 speed = be16_to_cpup((__be16 *)&caps[14]);
2140 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2142 *(u16 *)&caps[8] = max_speed;
2143 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2144 *(u16 *)&caps[14] = speed;
2145 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2148 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2149 "(assuming 650KB/sec)\n", drive->name);
2150 *(u16 *)&caps[14] = 650;
2153 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2154 "(assuming 650KB/sec)\n", drive->name);
2155 *(u16 *)&caps[8] = 650;
2158 memcpy(&tape->caps, caps, 20);
2160 /* device lacks locking support according to capabilities page */
2161 if ((caps[6] & 1) == 0)
2162 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2165 tape->blk_size = 512;
2166 else if (caps[7] & 0x04)
2167 tape->blk_size = 1024;
2170 #ifdef CONFIG_IDE_PROC_FS
2171 #define ide_tape_devset_get(name, field) \
2172 static int get_##name(ide_drive_t *drive) \
2174 idetape_tape_t *tape = drive->driver_data; \
2175 return tape->field; \
2178 #define ide_tape_devset_set(name, field) \
2179 static int set_##name(ide_drive_t *drive, int arg) \
2181 idetape_tape_t *tape = drive->driver_data; \
2182 tape->field = arg; \
2186 #define ide_tape_devset_rw_field(_name, _field) \
2187 ide_tape_devset_get(_name, _field) \
2188 ide_tape_devset_set(_name, _field) \
2189 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2191 #define ide_tape_devset_r_field(_name, _field) \
2192 ide_tape_devset_get(_name, _field) \
2193 IDE_DEVSET(_name, 0, get_##_name, NULL)
2195 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2196 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2197 static int divf_buffer(ide_drive_t *drive) { return 2; }
2198 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2200 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2202 ide_tape_devset_rw_field(debug_mask, debug_mask);
2203 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2205 ide_tape_devset_r_field(avg_speed, avg_speed);
2206 ide_tape_devset_r_field(speed, caps[14]);
2207 ide_tape_devset_r_field(buffer, caps[16]);
2208 ide_tape_devset_r_field(buffer_size, buffer_size);
2210 static const struct ide_proc_devset idetape_settings[] = {
2211 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2212 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2213 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2214 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2215 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2216 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2217 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2218 mulf_tdsc, divf_tdsc),
2224 * The function below is called to:
2226 * 1. Initialize our various state variables.
2227 * 2. Ask the tape for its capabilities.
2228 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2229 * is chosen based on the recommendation which we received in step 2.
2231 * Note that at this point ide.c already assigned us an irq, so that we can
2232 * queue requests here and wait for their completion.
2234 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2240 u16 *ctl = (u16 *)&tape->caps[12];
2242 drive->pc_callback = ide_tape_callback;
2244 spin_lock_init(&tape->lock);
2245 drive->dsc_overlap = 1;
2246 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2247 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2249 drive->dsc_overlap = 0;
2251 /* Seagate Travan drives do not support DSC overlap. */
2252 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2253 drive->dsc_overlap = 0;
2254 tape->minor = minor;
2255 tape->name[0] = 'h';
2256 tape->name[1] = 't';
2257 tape->name[2] = '0' + minor;
2258 tape->chrdev_dir = IDETAPE_DIR_NONE;
2260 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2262 /* Command packet DRQ type */
2263 if (((gcw[0] & 0x60) >> 5) == 1)
2264 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2266 idetape_get_inquiry_results(drive);
2267 idetape_get_mode_sense_results(drive);
2268 ide_tape_get_bsize_from_bdesc(drive);
2269 tape->user_bs_factor = 1;
2270 tape->buffer_size = *ctl * tape->blk_size;
2271 while (tape->buffer_size > 0xffff) {
2272 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2274 tape->buffer_size = *ctl * tape->blk_size;
2276 buffer_size = tape->buffer_size;
2277 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2278 if (buffer_size % PAGE_SIZE) {
2279 tape->pages_per_buffer++;
2280 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2283 /* select the "best" DSC read/write polling freq */
2284 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2286 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2289 * Ensure that the number we got makes sense; limit it within
2290 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2292 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2293 IDETAPE_DSC_RW_MAX);
2294 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2296 drive->name, tape->name, *(u16 *)&tape->caps[14],
2297 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2298 tape->buffer_size / 1024,
2299 tape->best_dsc_rw_freq * 1000 / HZ,
2300 drive->using_dma ? ", DMA":"");
2302 ide_proc_register_driver(drive, tape->driver);
2305 static void ide_tape_remove(ide_drive_t *drive)
2307 idetape_tape_t *tape = drive->driver_data;
2309 ide_proc_unregister_driver(drive, tape->driver);
2311 ide_unregister_region(tape->disk);
2316 static void ide_tape_release(struct kref *kref)
2318 struct ide_tape_obj *tape = to_ide_tape(kref);
2319 ide_drive_t *drive = tape->drive;
2320 struct gendisk *g = tape->disk;
2322 BUG_ON(tape->merge_bh_size);
2324 drive->dsc_overlap = 0;
2325 drive->driver_data = NULL;
2326 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2327 device_destroy(idetape_sysfs_class,
2328 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2329 idetape_devs[tape->minor] = NULL;
2330 g->private_data = NULL;
2335 #ifdef CONFIG_IDE_PROC_FS
2336 static int proc_idetape_read_name
2337 (char *page, char **start, off_t off, int count, int *eof, void *data)
2339 ide_drive_t *drive = (ide_drive_t *) data;
2340 idetape_tape_t *tape = drive->driver_data;
2344 len = sprintf(out, "%s\n", tape->name);
2345 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2348 static ide_proc_entry_t idetape_proc[] = {
2349 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2350 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2351 { NULL, 0, NULL, NULL }
2355 static int ide_tape_probe(ide_drive_t *);
2357 static ide_driver_t idetape_driver = {
2359 .owner = THIS_MODULE,
2361 .bus = &ide_bus_type,
2363 .probe = ide_tape_probe,
2364 .remove = ide_tape_remove,
2365 .version = IDETAPE_VERSION,
2367 .do_request = idetape_do_request,
2368 .end_request = idetape_end_request,
2369 .error = __ide_error,
2370 #ifdef CONFIG_IDE_PROC_FS
2371 .proc = idetape_proc,
2372 .settings = idetape_settings,
2376 /* Our character device supporting functions, passed to register_chrdev. */
2377 static const struct file_operations idetape_fops = {
2378 .owner = THIS_MODULE,
2379 .read = idetape_chrdev_read,
2380 .write = idetape_chrdev_write,
2381 .ioctl = idetape_chrdev_ioctl,
2382 .open = idetape_chrdev_open,
2383 .release = idetape_chrdev_release,
2386 static int idetape_open(struct inode *inode, struct file *filp)
2388 struct gendisk *disk = inode->i_bdev->bd_disk;
2389 struct ide_tape_obj *tape;
2391 tape = ide_tape_get(disk);
2398 static int idetape_release(struct inode *inode, struct file *filp)
2400 struct gendisk *disk = inode->i_bdev->bd_disk;
2401 struct ide_tape_obj *tape = ide_tape_g(disk);
2408 static int idetape_ioctl(struct inode *inode, struct file *file,
2409 unsigned int cmd, unsigned long arg)
2411 struct block_device *bdev = inode->i_bdev;
2412 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2413 ide_drive_t *drive = tape->drive;
2414 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2416 err = idetape_blkdev_ioctl(drive, cmd, arg);
2420 static struct block_device_operations idetape_block_ops = {
2421 .owner = THIS_MODULE,
2422 .open = idetape_open,
2423 .release = idetape_release,
2424 .ioctl = idetape_ioctl,
2427 static int ide_tape_probe(ide_drive_t *drive)
2429 idetape_tape_t *tape;
2433 if (!strstr("ide-tape", drive->driver_req))
2436 if (drive->media != ide_tape)
2439 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2440 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2441 " the driver\n", drive->name);
2444 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2446 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2451 g = alloc_disk(1 << PARTN_BITS);
2455 ide_init_disk(g, drive);
2457 kref_init(&tape->kref);
2459 tape->drive = drive;
2460 tape->driver = &idetape_driver;
2463 g->private_data = &tape->driver;
2465 drive->driver_data = tape;
2467 mutex_lock(&idetape_ref_mutex);
2468 for (minor = 0; idetape_devs[minor]; minor++)
2470 idetape_devs[minor] = tape;
2471 mutex_unlock(&idetape_ref_mutex);
2473 idetape_setup(drive, tape, minor);
2475 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2476 MKDEV(IDETAPE_MAJOR, minor), NULL,
2478 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2479 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2482 g->fops = &idetape_block_ops;
2483 ide_register_region(g);
2493 static void __exit idetape_exit(void)
2495 driver_unregister(&idetape_driver.gen_driver);
2496 class_destroy(idetape_sysfs_class);
2497 unregister_chrdev(IDETAPE_MAJOR, "ht");
2500 static int __init idetape_init(void)
2503 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2504 if (IS_ERR(idetape_sysfs_class)) {
2505 idetape_sysfs_class = NULL;
2506 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2511 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2512 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2515 goto out_free_class;
2518 error = driver_register(&idetape_driver.gen_driver);
2520 goto out_free_driver;
2525 driver_unregister(&idetape_driver.gen_driver);
2527 class_destroy(idetape_sysfs_class);
2532 MODULE_ALIAS("ide:*m-tape*");
2533 module_init(idetape_init);
2534 module_exit(idetape_exit);
2535 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2536 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2537 MODULE_LICENSE("GPL");