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1/*
2 * IDE ATAPI streaming tape driver.
3 *
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
6 *
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.
10 *
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
13 *
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
16 */
17
18#define DRV_NAME "ide-tape"
19
20#define IDETAPE_VERSION "1.20"
21
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>
28#include <linux/mm.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/seq_file.h>
35#include <linux/slab.h>
36#include <linux/pci.h>
37#include <linux/ide.h>
38#include <linux/completion.h>
39#include <linux/bitops.h>
40#include <linux/mutex.h>
41#include <scsi/scsi.h>
42
43#include <asm/byteorder.h>
44#include <linux/uaccess.h>
45#include <linux/io.h>
46#include <asm/unaligned.h>
47#include <linux/mtio.h>
48
49/* define to see debug info */
50#undef IDETAPE_DEBUG_LOG
51
52#ifdef IDETAPE_DEBUG_LOG
53#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args)
54#else
55#define ide_debug_log(lvl, fmt, args...) do {} while (0)
56#endif
57
58/**************************** Tunable parameters *****************************/
59/*
60 * After each failed packet command we issue a request sense command and retry
61 * the packet command IDETAPE_MAX_PC_RETRIES times.
62 *
63 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
64 */
65#define IDETAPE_MAX_PC_RETRIES 3
66
67/*
68 * The following parameter is used to select the point in the internal tape fifo
69 * in which we will start to refill the buffer. Decreasing the following
70 * parameter will improve the system's latency and interactive response, while
71 * using a high value might improve system throughput.
72 */
73#define IDETAPE_FIFO_THRESHOLD 2
74
75/*
76 * DSC polling parameters.
77 *
78 * Polling for DSC (a single bit in the status register) is a very important
79 * function in ide-tape. There are two cases in which we poll for DSC:
80 *
81 * 1. Before a read/write packet command, to ensure that we can transfer data
82 * from/to the tape's data buffers, without causing an actual media access.
83 * In case the tape is not ready yet, we take out our request from the device
84 * request queue, so that ide.c could service requests from the other device
85 * on the same interface in the meantime.
86 *
87 * 2. After the successful initialization of a "media access packet command",
88 * which is a command that can take a long time to complete (the interval can
89 * range from several seconds to even an hour). Again, we postpone our request
90 * in the middle to free the bus for the other device. The polling frequency
91 * here should be lower than the read/write frequency since those media access
92 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
93 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
94 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
95 *
96 * We also set a timeout for the timer, in case something goes wrong. The
97 * timeout should be longer then the maximum execution time of a tape operation.
98 */
99
100/* DSC timings. */
101#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
102#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
103#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
104#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
105#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
106#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
107#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
108
109/*************************** End of tunable parameters ***********************/
110
111/* tape directions */
112enum {
113 IDETAPE_DIR_NONE = (1 << 0),
114 IDETAPE_DIR_READ = (1 << 1),
115 IDETAPE_DIR_WRITE = (1 << 2),
116};
117
118/* Tape door status */
119#define DOOR_UNLOCKED 0
120#define DOOR_LOCKED 1
121#define DOOR_EXPLICITLY_LOCKED 2
122
123/* Some defines for the SPACE command */
124#define IDETAPE_SPACE_OVER_FILEMARK 1
125#define IDETAPE_SPACE_TO_EOD 3
126
127/* Some defines for the LOAD UNLOAD command */
128#define IDETAPE_LU_LOAD_MASK 1
129#define IDETAPE_LU_RETENSION_MASK 2
130#define IDETAPE_LU_EOT_MASK 4
131
132/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
133#define IDETAPE_BLOCK_DESCRIPTOR 0
134#define IDETAPE_CAPABILITIES_PAGE 0x2a
135
136/*
137 * Most of our global data which we need to save even as we leave the driver due
138 * to an interrupt or a timer event is stored in the struct defined below.
139 */
140typedef struct ide_tape_obj {
141 ide_drive_t *drive;
142 struct ide_driver *driver;
143 struct gendisk *disk;
144 struct device dev;
145
146 /* used by REQ_IDETAPE_{READ,WRITE} requests */
147 struct ide_atapi_pc queued_pc;
148
149 /*
150 * DSC polling variables.
151 *
152 * While polling for DSC we use postponed_rq to postpone the current
153 * request so that ide.c will be able to service pending requests on the
154 * other device. Note that at most we will have only one DSC (usually
155 * data transfer) request in the device request queue.
156 */
157 bool postponed_rq;
158
159 /* The time in which we started polling for DSC */
160 unsigned long dsc_polling_start;
161 /* Timer used to poll for dsc */
162 struct timer_list dsc_timer;
163 /* Read/Write dsc polling frequency */
164 unsigned long best_dsc_rw_freq;
165 unsigned long dsc_poll_freq;
166 unsigned long dsc_timeout;
167
168 /* Read position information */
169 u8 partition;
170 /* Current block */
171 unsigned int first_frame;
172
173 /* Last error information */
174 u8 sense_key, asc, ascq;
175
176 /* Character device operation */
177 unsigned int minor;
178 /* device name */
179 char name[4];
180 /* Current character device data transfer direction */
181 u8 chrdev_dir;
182
183 /* tape block size, usually 512 or 1024 bytes */
184 unsigned short blk_size;
185 int user_bs_factor;
186
187 /* Copy of the tape's Capabilities and Mechanical Page */
188 u8 caps[20];
189
190 /*
191 * Active data transfer request parameters.
192 *
193 * At most, there is only one ide-tape originated data transfer request
194 * in the device request queue. This allows ide.c to easily service
195 * requests from the other device when we postpone our active request.
196 */
197
198 /* Data buffer size chosen based on the tape's recommendation */
199 int buffer_size;
200 /* Staging buffer of buffer_size bytes */
201 void *buf;
202 /* The read/write cursor */
203 void *cur;
204 /* The number of valid bytes in buf */
205 size_t valid;
206
207 /* Measures average tape speed */
208 unsigned long avg_time;
209 int avg_size;
210 int avg_speed;
211
212 /* the door is currently locked */
213 int door_locked;
214 /* the tape hardware is write protected */
215 char drv_write_prot;
216 /* the tape is write protected (hardware or opened as read-only) */
217 char write_prot;
218} idetape_tape_t;
219
220static DEFINE_MUTEX(ide_tape_mutex);
221static DEFINE_MUTEX(idetape_ref_mutex);
222
223static DEFINE_MUTEX(idetape_chrdev_mutex);
224
225static struct class *idetape_sysfs_class;
226
227static void ide_tape_release(struct device *);
228
229static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
230
231static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev,
232 unsigned int i)
233{
234 struct ide_tape_obj *tape = NULL;
235
236 mutex_lock(&idetape_ref_mutex);
237
238 if (cdev)
239 tape = idetape_devs[i];
240 else
241 tape = ide_drv_g(disk, ide_tape_obj);
242
243 if (tape) {
244 if (ide_device_get(tape->drive))
245 tape = NULL;
246 else
247 get_device(&tape->dev);
248 }
249
250 mutex_unlock(&idetape_ref_mutex);
251 return tape;
252}
253
254static void ide_tape_put(struct ide_tape_obj *tape)
255{
256 ide_drive_t *drive = tape->drive;
257
258 mutex_lock(&idetape_ref_mutex);
259 put_device(&tape->dev);
260 ide_device_put(drive);
261 mutex_unlock(&idetape_ref_mutex);
262}
263
264/*
265 * called on each failed packet command retry to analyze the request sense. We
266 * currently do not utilize this information.
267 */
268static void idetape_analyze_error(ide_drive_t *drive)
269{
270 idetape_tape_t *tape = drive->driver_data;
271 struct ide_atapi_pc *pc = drive->failed_pc;
272 struct request *rq = drive->hwif->rq;
273 u8 *sense = bio_data(rq->bio);
274
275 tape->sense_key = sense[2] & 0xF;
276 tape->asc = sense[12];
277 tape->ascq = sense[13];
278
279 ide_debug_log(IDE_DBG_FUNC,
280 "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x",
281 rq->cmd[0], tape->sense_key, tape->asc, tape->ascq);
282
283 /* correct remaining bytes to transfer */
284 if (pc->flags & PC_FLAG_DMA_ERROR)
285 rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
286
287 /*
288 * If error was the result of a zero-length read or write command,
289 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
290 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
291 */
292 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
293 /* length == 0 */
294 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
295 if (tape->sense_key == 5) {
296 /* don't report an error, everything's ok */
297 pc->error = 0;
298 /* don't retry read/write */
299 pc->flags |= PC_FLAG_ABORT;
300 }
301 }
302 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
303 pc->error = IDE_DRV_ERROR_FILEMARK;
304 pc->flags |= PC_FLAG_ABORT;
305 }
306 if (pc->c[0] == WRITE_6) {
307 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
308 && tape->asc == 0x0 && tape->ascq == 0x2)) {
309 pc->error = IDE_DRV_ERROR_EOD;
310 pc->flags |= PC_FLAG_ABORT;
311 }
312 }
313 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
314 if (tape->sense_key == 8) {
315 pc->error = IDE_DRV_ERROR_EOD;
316 pc->flags |= PC_FLAG_ABORT;
317 }
318 if (!(pc->flags & PC_FLAG_ABORT) &&
319 (blk_rq_bytes(rq) - rq->resid_len))
320 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
321 }
322}
323
324static void ide_tape_handle_dsc(ide_drive_t *);
325
326static int ide_tape_callback(ide_drive_t *drive, int dsc)
327{
328 idetape_tape_t *tape = drive->driver_data;
329 struct ide_atapi_pc *pc = drive->pc;
330 struct request *rq = drive->hwif->rq;
331 int uptodate = pc->error ? 0 : 1;
332 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
333
334 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0],
335 dsc, err);
336
337 if (dsc)
338 ide_tape_handle_dsc(drive);
339
340 if (drive->failed_pc == pc)
341 drive->failed_pc = NULL;
342
343 if (pc->c[0] == REQUEST_SENSE) {
344 if (uptodate)
345 idetape_analyze_error(drive);
346 else
347 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
348 "itself - Aborting request!\n");
349 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
350 unsigned int blocks =
351 (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size;
352
353 tape->avg_size += blocks * tape->blk_size;
354
355 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
356 tape->avg_speed = tape->avg_size * HZ /
357 (jiffies - tape->avg_time) / 1024;
358 tape->avg_size = 0;
359 tape->avg_time = jiffies;
360 }
361
362 tape->first_frame += blocks;
363
364 if (pc->error) {
365 uptodate = 0;
366 err = pc->error;
367 }
368 }
369 rq->errors = err;
370
371 return uptodate;
372}
373
374/*
375 * Postpone the current request so that ide.c will be able to service requests
376 * from another device on the same port while we are polling for DSC.
377 */
378static void ide_tape_stall_queue(ide_drive_t *drive)
379{
380 idetape_tape_t *tape = drive->driver_data;
381
382 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu",
383 drive->hwif->rq->cmd[0], tape->dsc_poll_freq);
384
385 tape->postponed_rq = true;
386
387 ide_stall_queue(drive, tape->dsc_poll_freq);
388}
389
390static void ide_tape_handle_dsc(ide_drive_t *drive)
391{
392 idetape_tape_t *tape = drive->driver_data;
393
394 /* Media access command */
395 tape->dsc_polling_start = jiffies;
396 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
397 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
398 /* Allow ide.c to handle other requests */
399 ide_tape_stall_queue(drive);
400}
401
402/*
403 * Packet Command Interface
404 *
405 * The current Packet Command is available in drive->pc, and will not change
406 * until we finish handling it. Each packet command is associated with a
407 * callback function that will be called when the command is finished.
408 *
409 * The handling will be done in three stages:
410 *
411 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
412 * the interrupt handler to ide_pc_intr.
413 *
414 * 2. On each interrupt, ide_pc_intr will be called. This step will be
415 * repeated until the device signals us that no more interrupts will be issued.
416 *
417 * 3. ATAPI Tape media access commands have immediate status with a delayed
418 * process. In case of a successful initiation of a media access packet command,
419 * the DSC bit will be set when the actual execution of the command is finished.
420 * Since the tape drive will not issue an interrupt, we have to poll for this
421 * event. In this case, we define the request as "low priority request" by
422 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
423 * exit the driver.
424 *
425 * ide.c will then give higher priority to requests which originate from the
426 * other device, until will change rq_status to RQ_ACTIVE.
427 *
428 * 4. When the packet command is finished, it will be checked for errors.
429 *
430 * 5. In case an error was found, we queue a request sense packet command in
431 * front of the request queue and retry the operation up to
432 * IDETAPE_MAX_PC_RETRIES times.
433 *
434 * 6. In case no error was found, or we decided to give up and not to retry
435 * again, the callback function will be called and then we will handle the next
436 * request.
437 */
438
439static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
440 struct ide_cmd *cmd,
441 struct ide_atapi_pc *pc)
442{
443 idetape_tape_t *tape = drive->driver_data;
444 struct request *rq = drive->hwif->rq;
445
446 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
447 drive->failed_pc = pc;
448
449 /* Set the current packet command */
450 drive->pc = pc;
451
452 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
453 (pc->flags & PC_FLAG_ABORT)) {
454
455 /*
456 * We will "abort" retrying a packet command in case legitimate
457 * error code was received (crossing a filemark, or end of the
458 * media, for example).
459 */
460 if (!(pc->flags & PC_FLAG_ABORT)) {
461 if (!(pc->c[0] == TEST_UNIT_READY &&
462 tape->sense_key == 2 && tape->asc == 4 &&
463 (tape->ascq == 1 || tape->ascq == 8))) {
464 printk(KERN_ERR "ide-tape: %s: I/O error, "
465 "pc = %2x, key = %2x, "
466 "asc = %2x, ascq = %2x\n",
467 tape->name, pc->c[0],
468 tape->sense_key, tape->asc,
469 tape->ascq);
470 }
471 /* Giving up */
472 pc->error = IDE_DRV_ERROR_GENERAL;
473 }
474
475 drive->failed_pc = NULL;
476 drive->pc_callback(drive, 0);
477 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
478 return ide_stopped;
479 }
480 ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries,
481 pc->c[0]);
482
483 pc->retries++;
484
485 return ide_issue_pc(drive, cmd);
486}
487
488/* A mode sense command is used to "sense" tape parameters. */
489static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
490{
491 ide_init_pc(pc);
492 pc->c[0] = MODE_SENSE;
493 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
494 /* DBD = 1 - Don't return block descriptors */
495 pc->c[1] = 8;
496 pc->c[2] = page_code;
497 /*
498 * Changed pc->c[3] to 0 (255 will at best return unused info).
499 *
500 * For SCSI this byte is defined as subpage instead of high byte
501 * of length and some IDE drives seem to interpret it this way
502 * and return an error when 255 is used.
503 */
504 pc->c[3] = 0;
505 /* We will just discard data in that case */
506 pc->c[4] = 255;
507 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
508 pc->req_xfer = 12;
509 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
510 pc->req_xfer = 24;
511 else
512 pc->req_xfer = 50;
513}
514
515static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
516{
517 ide_hwif_t *hwif = drive->hwif;
518 idetape_tape_t *tape = drive->driver_data;
519 struct ide_atapi_pc *pc = drive->pc;
520 u8 stat;
521
522 stat = hwif->tp_ops->read_status(hwif);
523
524 if (stat & ATA_DSC) {
525 if (stat & ATA_ERR) {
526 /* Error detected */
527 if (pc->c[0] != TEST_UNIT_READY)
528 printk(KERN_ERR "ide-tape: %s: I/O error, ",
529 tape->name);
530 /* Retry operation */
531 ide_retry_pc(drive);
532 return ide_stopped;
533 }
534 pc->error = 0;
535 } else {
536 pc->error = IDE_DRV_ERROR_GENERAL;
537 drive->failed_pc = NULL;
538 }
539 drive->pc_callback(drive, 0);
540 return ide_stopped;
541}
542
543static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
544 struct ide_atapi_pc *pc, struct request *rq,
545 u8 opcode)
546{
547 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
548
549 ide_init_pc(pc);
550 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
551 pc->c[1] = 1;
552
553 if (blk_rq_bytes(rq) == tape->buffer_size)
554 pc->flags |= PC_FLAG_DMA_OK;
555
556 if (opcode == READ_6)
557 pc->c[0] = READ_6;
558 else if (opcode == WRITE_6) {
559 pc->c[0] = WRITE_6;
560 pc->flags |= PC_FLAG_WRITING;
561 }
562
563 memcpy(rq->cmd, pc->c, 12);
564}
565
566static ide_startstop_t idetape_do_request(ide_drive_t *drive,
567 struct request *rq, sector_t block)
568{
569 ide_hwif_t *hwif = drive->hwif;
570 idetape_tape_t *tape = drive->driver_data;
571 struct ide_atapi_pc *pc = NULL;
572 struct ide_cmd cmd;
573 u8 stat;
574
575 ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
576 rq->cmd[0], (unsigned long long)blk_rq_pos(rq),
577 blk_rq_sectors(rq));
578
579 BUG_ON(!(rq->cmd_type == REQ_TYPE_DRV_PRIV ||
580 rq->cmd_type == REQ_TYPE_ATA_SENSE));
581
582 /* Retry a failed packet command */
583 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
584 pc = drive->failed_pc;
585 goto out;
586 }
587
588 /*
589 * If the tape is still busy, postpone our request and service
590 * the other device meanwhile.
591 */
592 stat = hwif->tp_ops->read_status(hwif);
593
594 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
595 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
596 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
597
598 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
599 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
600 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
601 }
602
603 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
604 !(stat & ATA_DSC)) {
605 if (!tape->postponed_rq) {
606 tape->dsc_polling_start = jiffies;
607 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
608 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
609 } else if (time_after(jiffies, tape->dsc_timeout)) {
610 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
611 tape->name);
612 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
613 idetape_media_access_finished(drive);
614 return ide_stopped;
615 } else {
616 return ide_do_reset(drive);
617 }
618 } else if (time_after(jiffies,
619 tape->dsc_polling_start +
620 IDETAPE_DSC_MA_THRESHOLD))
621 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
622 ide_tape_stall_queue(drive);
623 return ide_stopped;
624 } else {
625 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
626 tape->postponed_rq = false;
627 }
628
629 if (rq->cmd[13] & REQ_IDETAPE_READ) {
630 pc = &tape->queued_pc;
631 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
632 goto out;
633 }
634 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
635 pc = &tape->queued_pc;
636 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
637 goto out;
638 }
639 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
640 pc = (struct ide_atapi_pc *)rq->special;
641 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
642 rq->cmd[13] |= REQ_IDETAPE_PC2;
643 goto out;
644 }
645 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
646 idetape_media_access_finished(drive);
647 return ide_stopped;
648 }
649 BUG();
650
651out:
652 /* prepare sense request for this command */
653 ide_prep_sense(drive, rq);
654
655 memset(&cmd, 0, sizeof(cmd));
656
657 if (rq_data_dir(rq))
658 cmd.tf_flags |= IDE_TFLAG_WRITE;
659
660 cmd.rq = rq;
661
662 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
663 ide_map_sg(drive, &cmd);
664
665 return ide_tape_issue_pc(drive, &cmd, pc);
666}
667
668/*
669 * Write a filemark if write_filemark=1. Flush the device buffers without
670 * writing a filemark otherwise.
671 */
672static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
673 struct ide_atapi_pc *pc, int write_filemark)
674{
675 ide_init_pc(pc);
676 pc->c[0] = WRITE_FILEMARKS;
677 pc->c[4] = write_filemark;
678 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
679}
680
681static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
682{
683 idetape_tape_t *tape = drive->driver_data;
684 struct gendisk *disk = tape->disk;
685 int load_attempted = 0;
686
687 /* Wait for the tape to become ready */
688 set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags);
689 timeout += jiffies;
690 while (time_before(jiffies, timeout)) {
691 if (ide_do_test_unit_ready(drive, disk) == 0)
692 return 0;
693 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
694 || (tape->asc == 0x3A)) {
695 /* no media */
696 if (load_attempted)
697 return -ENOMEDIUM;
698 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
699 load_attempted = 1;
700 /* not about to be ready */
701 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
702 (tape->ascq == 1 || tape->ascq == 8)))
703 return -EIO;
704 msleep(100);
705 }
706 return -EIO;
707}
708
709static int idetape_flush_tape_buffers(ide_drive_t *drive)
710{
711 struct ide_tape_obj *tape = drive->driver_data;
712 struct ide_atapi_pc pc;
713 int rc;
714
715 idetape_create_write_filemark_cmd(drive, &pc, 0);
716 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
717 if (rc)
718 return rc;
719 idetape_wait_ready(drive, 60 * 5 * HZ);
720 return 0;
721}
722
723static int ide_tape_read_position(ide_drive_t *drive)
724{
725 idetape_tape_t *tape = drive->driver_data;
726 struct ide_atapi_pc pc;
727 u8 buf[20];
728
729 ide_debug_log(IDE_DBG_FUNC, "enter");
730
731 /* prep cmd */
732 ide_init_pc(&pc);
733 pc.c[0] = READ_POSITION;
734 pc.req_xfer = 20;
735
736 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
737 return -1;
738
739 if (!pc.error) {
740 ide_debug_log(IDE_DBG_FUNC, "BOP - %s",
741 (buf[0] & 0x80) ? "Yes" : "No");
742 ide_debug_log(IDE_DBG_FUNC, "EOP - %s",
743 (buf[0] & 0x40) ? "Yes" : "No");
744
745 if (buf[0] & 0x4) {
746 printk(KERN_INFO "ide-tape: Block location is unknown"
747 "to the tape\n");
748 clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
749 &drive->atapi_flags);
750 return -1;
751 } else {
752 ide_debug_log(IDE_DBG_FUNC, "Block Location: %u",
753 be32_to_cpup((__be32 *)&buf[4]));
754
755 tape->partition = buf[1];
756 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
757 set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
758 &drive->atapi_flags);
759 }
760 }
761
762 return tape->first_frame;
763}
764
765static void idetape_create_locate_cmd(ide_drive_t *drive,
766 struct ide_atapi_pc *pc,
767 unsigned int block, u8 partition, int skip)
768{
769 ide_init_pc(pc);
770 pc->c[0] = POSITION_TO_ELEMENT;
771 pc->c[1] = 2;
772 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
773 pc->c[8] = partition;
774 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
775}
776
777static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
778{
779 idetape_tape_t *tape = drive->driver_data;
780
781 if (tape->chrdev_dir != IDETAPE_DIR_READ)
782 return;
783
784 clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags);
785 tape->valid = 0;
786 if (tape->buf != NULL) {
787 kfree(tape->buf);
788 tape->buf = NULL;
789 }
790
791 tape->chrdev_dir = IDETAPE_DIR_NONE;
792}
793
794/*
795 * Position the tape to the requested block using the LOCATE packet command.
796 * A READ POSITION command is then issued to check where we are positioned. Like
797 * all higher level operations, we queue the commands at the tail of the request
798 * queue and wait for their completion.
799 */
800static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
801 u8 partition, int skip)
802{
803 idetape_tape_t *tape = drive->driver_data;
804 struct gendisk *disk = tape->disk;
805 int ret;
806 struct ide_atapi_pc pc;
807
808 if (tape->chrdev_dir == IDETAPE_DIR_READ)
809 __ide_tape_discard_merge_buffer(drive);
810 idetape_wait_ready(drive, 60 * 5 * HZ);
811 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
812 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
813 if (ret)
814 return ret;
815
816 ret = ide_tape_read_position(drive);
817 if (ret < 0)
818 return ret;
819 return 0;
820}
821
822static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
823 int restore_position)
824{
825 idetape_tape_t *tape = drive->driver_data;
826 int seek, position;
827
828 __ide_tape_discard_merge_buffer(drive);
829 if (restore_position) {
830 position = ide_tape_read_position(drive);
831 seek = position > 0 ? position : 0;
832 if (idetape_position_tape(drive, seek, 0, 0)) {
833 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
834 " %s\n", tape->name, __func__);
835 return;
836 }
837 }
838}
839
840/*
841 * Generate a read/write request for the block device interface and wait for it
842 * to be serviced.
843 */
844static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
845{
846 idetape_tape_t *tape = drive->driver_data;
847 struct request *rq;
848 int ret;
849
850 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size);
851
852 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
853 BUG_ON(size < 0 || size % tape->blk_size);
854
855 rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
856 rq->cmd_type = REQ_TYPE_DRV_PRIV;
857 rq->cmd[13] = cmd;
858 rq->rq_disk = tape->disk;
859 rq->__sector = tape->first_frame;
860
861 if (size) {
862 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
863 __GFP_RECLAIM);
864 if (ret)
865 goto out_put;
866 }
867
868 blk_execute_rq(drive->queue, tape->disk, rq, 0);
869
870 /* calculate the number of transferred bytes and update buffer state */
871 size -= rq->resid_len;
872 tape->cur = tape->buf;
873 if (cmd == REQ_IDETAPE_READ)
874 tape->valid = size;
875 else
876 tape->valid = 0;
877
878 ret = size;
879 if (rq->errors == IDE_DRV_ERROR_GENERAL)
880 ret = -EIO;
881out_put:
882 blk_put_request(rq);
883 return ret;
884}
885
886static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
887{
888 ide_init_pc(pc);
889 pc->c[0] = INQUIRY;
890 pc->c[4] = 254;
891 pc->req_xfer = 254;
892}
893
894static void idetape_create_rewind_cmd(ide_drive_t *drive,
895 struct ide_atapi_pc *pc)
896{
897 ide_init_pc(pc);
898 pc->c[0] = REZERO_UNIT;
899 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
900}
901
902static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
903{
904 ide_init_pc(pc);
905 pc->c[0] = ERASE;
906 pc->c[1] = 1;
907 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
908}
909
910static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
911{
912 ide_init_pc(pc);
913 pc->c[0] = SPACE;
914 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
915 pc->c[1] = cmd;
916 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
917}
918
919static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
920{
921 idetape_tape_t *tape = drive->driver_data;
922
923 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
924 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
925 " but we are not writing.\n");
926 return;
927 }
928 if (tape->buf) {
929 size_t aligned = roundup(tape->valid, tape->blk_size);
930
931 memset(tape->cur, 0, aligned - tape->valid);
932 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
933 kfree(tape->buf);
934 tape->buf = NULL;
935 }
936 tape->chrdev_dir = IDETAPE_DIR_NONE;
937}
938
939static int idetape_init_rw(ide_drive_t *drive, int dir)
940{
941 idetape_tape_t *tape = drive->driver_data;
942 int rc;
943
944 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
945
946 if (tape->chrdev_dir == dir)
947 return 0;
948
949 if (tape->chrdev_dir == IDETAPE_DIR_READ)
950 ide_tape_discard_merge_buffer(drive, 1);
951 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
952 ide_tape_flush_merge_buffer(drive);
953 idetape_flush_tape_buffers(drive);
954 }
955
956 if (tape->buf || tape->valid) {
957 printk(KERN_ERR "ide-tape: valid should be 0 now\n");
958 tape->valid = 0;
959 }
960
961 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
962 if (!tape->buf)
963 return -ENOMEM;
964 tape->chrdev_dir = dir;
965 tape->cur = tape->buf;
966
967 /*
968 * Issue a 0 rw command to ensure that DSC handshake is
969 * switched from completion mode to buffer available mode. No
970 * point in issuing this if DSC overlap isn't supported, some
971 * drives (Seagate STT3401A) will return an error.
972 */
973 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
974 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
975 : REQ_IDETAPE_WRITE;
976
977 rc = idetape_queue_rw_tail(drive, cmd, 0);
978 if (rc < 0) {
979 kfree(tape->buf);
980 tape->buf = NULL;
981 tape->chrdev_dir = IDETAPE_DIR_NONE;
982 return rc;
983 }
984 }
985
986 return 0;
987}
988
989static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
990{
991 idetape_tape_t *tape = drive->driver_data;
992
993 memset(tape->buf, 0, tape->buffer_size);
994
995 while (bcount) {
996 unsigned int count = min(tape->buffer_size, bcount);
997
998 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
999 bcount -= count;
1000 }
1001}
1002
1003/*
1004 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1005 * currently support only one partition.
1006 */
1007static int idetape_rewind_tape(ide_drive_t *drive)
1008{
1009 struct ide_tape_obj *tape = drive->driver_data;
1010 struct gendisk *disk = tape->disk;
1011 struct ide_atapi_pc pc;
1012 int ret;
1013
1014 ide_debug_log(IDE_DBG_FUNC, "enter");
1015
1016 idetape_create_rewind_cmd(drive, &pc);
1017 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1018 if (ret)
1019 return ret;
1020
1021 ret = ide_tape_read_position(drive);
1022 if (ret < 0)
1023 return ret;
1024 return 0;
1025}
1026
1027/* mtio.h compatible commands should be issued to the chrdev interface. */
1028static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1029 unsigned long arg)
1030{
1031 idetape_tape_t *tape = drive->driver_data;
1032 void __user *argp = (void __user *)arg;
1033
1034 struct idetape_config {
1035 int dsc_rw_frequency;
1036 int dsc_media_access_frequency;
1037 int nr_stages;
1038 } config;
1039
1040 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd);
1041
1042 switch (cmd) {
1043 case 0x0340:
1044 if (copy_from_user(&config, argp, sizeof(config)))
1045 return -EFAULT;
1046 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1047 break;
1048 case 0x0350:
1049 memset(&config, 0, sizeof(config));
1050 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1051 config.nr_stages = 1;
1052 if (copy_to_user(argp, &config, sizeof(config)))
1053 return -EFAULT;
1054 break;
1055 default:
1056 return -EIO;
1057 }
1058 return 0;
1059}
1060
1061static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1062 int mt_count)
1063{
1064 idetape_tape_t *tape = drive->driver_data;
1065 struct gendisk *disk = tape->disk;
1066 struct ide_atapi_pc pc;
1067 int retval, count = 0;
1068 int sprev = !!(tape->caps[4] & 0x20);
1069
1070
1071 ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count);
1072
1073 if (mt_count == 0)
1074 return 0;
1075 if (MTBSF == mt_op || MTBSFM == mt_op) {
1076 if (!sprev)
1077 return -EIO;
1078 mt_count = -mt_count;
1079 }
1080
1081 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1082 tape->valid = 0;
1083 if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK),
1084 &drive->atapi_flags))
1085 ++count;
1086 ide_tape_discard_merge_buffer(drive, 0);
1087 }
1088
1089 switch (mt_op) {
1090 case MTFSF:
1091 case MTBSF:
1092 idetape_create_space_cmd(&pc, mt_count - count,
1093 IDETAPE_SPACE_OVER_FILEMARK);
1094 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1095 case MTFSFM:
1096 case MTBSFM:
1097 if (!sprev)
1098 return -EIO;
1099 retval = idetape_space_over_filemarks(drive, MTFSF,
1100 mt_count - count);
1101 if (retval)
1102 return retval;
1103 count = (MTBSFM == mt_op ? 1 : -1);
1104 return idetape_space_over_filemarks(drive, MTFSF, count);
1105 default:
1106 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1107 mt_op);
1108 return -EIO;
1109 }
1110}
1111
1112/*
1113 * Our character device read / write functions.
1114 *
1115 * The tape is optimized to maximize throughput when it is transferring an
1116 * integral number of the "continuous transfer limit", which is a parameter of
1117 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1118 *
1119 * As of version 1.3 of the driver, the character device provides an abstract
1120 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1121 * same backup/restore procedure is supported. The driver will internally
1122 * convert the requests to the recommended transfer unit, so that an unmatch
1123 * between the user's block size to the recommended size will only result in a
1124 * (slightly) increased driver overhead, but will no longer hit performance.
1125 * This is not applicable to Onstream.
1126 */
1127static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1128 size_t count, loff_t *ppos)
1129{
1130 struct ide_tape_obj *tape = file->private_data;
1131 ide_drive_t *drive = tape->drive;
1132 size_t done = 0;
1133 ssize_t ret = 0;
1134 int rc;
1135
1136 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count);
1137
1138 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1139 if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags))
1140 if (count > tape->blk_size &&
1141 (count % tape->blk_size) == 0)
1142 tape->user_bs_factor = count / tape->blk_size;
1143 }
1144
1145 rc = idetape_init_rw(drive, IDETAPE_DIR_READ);
1146 if (rc < 0)
1147 return rc;
1148
1149 while (done < count) {
1150 size_t todo;
1151
1152 /* refill if staging buffer is empty */
1153 if (!tape->valid) {
1154 /* If we are at a filemark, nothing more to read */
1155 if (test_bit(ilog2(IDE_AFLAG_FILEMARK),
1156 &drive->atapi_flags))
1157 break;
1158 /* read */
1159 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
1160 tape->buffer_size) <= 0)
1161 break;
1162 }
1163
1164 /* copy out */
1165 todo = min_t(size_t, count - done, tape->valid);
1166 if (copy_to_user(buf + done, tape->cur, todo))
1167 ret = -EFAULT;
1168
1169 tape->cur += todo;
1170 tape->valid -= todo;
1171 done += todo;
1172 }
1173
1174 if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) {
1175 idetape_space_over_filemarks(drive, MTFSF, 1);
1176 return 0;
1177 }
1178
1179 return ret ? ret : done;
1180}
1181
1182static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1183 size_t count, loff_t *ppos)
1184{
1185 struct ide_tape_obj *tape = file->private_data;
1186 ide_drive_t *drive = tape->drive;
1187 size_t done = 0;
1188 ssize_t ret = 0;
1189 int rc;
1190
1191 /* The drive is write protected. */
1192 if (tape->write_prot)
1193 return -EACCES;
1194
1195 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count);
1196
1197 /* Initialize write operation */
1198 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
1199 if (rc < 0)
1200 return rc;
1201
1202 while (done < count) {
1203 size_t todo;
1204
1205 /* flush if staging buffer is full */
1206 if (tape->valid == tape->buffer_size &&
1207 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1208 tape->buffer_size) <= 0)
1209 return rc;
1210
1211 /* copy in */
1212 todo = min_t(size_t, count - done,
1213 tape->buffer_size - tape->valid);
1214 if (copy_from_user(tape->cur, buf + done, todo))
1215 ret = -EFAULT;
1216
1217 tape->cur += todo;
1218 tape->valid += todo;
1219 done += todo;
1220 }
1221
1222 return ret ? ret : done;
1223}
1224
1225static int idetape_write_filemark(ide_drive_t *drive)
1226{
1227 struct ide_tape_obj *tape = drive->driver_data;
1228 struct ide_atapi_pc pc;
1229
1230 /* Write a filemark */
1231 idetape_create_write_filemark_cmd(drive, &pc, 1);
1232 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
1233 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1234 return -EIO;
1235 }
1236 return 0;
1237}
1238
1239/*
1240 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1241 * requested.
1242 *
1243 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1244 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1245 * usually not supported.
1246 *
1247 * The following commands are currently not supported:
1248 *
1249 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1250 * MT_ST_WRITE_THRESHOLD.
1251 */
1252static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1253{
1254 idetape_tape_t *tape = drive->driver_data;
1255 struct gendisk *disk = tape->disk;
1256 struct ide_atapi_pc pc;
1257 int i, retval;
1258
1259 ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d",
1260 mt_op, mt_count);
1261
1262 switch (mt_op) {
1263 case MTFSF:
1264 case MTFSFM:
1265 case MTBSF:
1266 case MTBSFM:
1267 if (!mt_count)
1268 return 0;
1269 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1270 default:
1271 break;
1272 }
1273
1274 switch (mt_op) {
1275 case MTWEOF:
1276 if (tape->write_prot)
1277 return -EACCES;
1278 ide_tape_discard_merge_buffer(drive, 1);
1279 for (i = 0; i < mt_count; i++) {
1280 retval = idetape_write_filemark(drive);
1281 if (retval)
1282 return retval;
1283 }
1284 return 0;
1285 case MTREW:
1286 ide_tape_discard_merge_buffer(drive, 0);
1287 if (idetape_rewind_tape(drive))
1288 return -EIO;
1289 return 0;
1290 case MTLOAD:
1291 ide_tape_discard_merge_buffer(drive, 0);
1292 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1293 case MTUNLOAD:
1294 case MTOFFL:
1295 /*
1296 * If door is locked, attempt to unlock before
1297 * attempting to eject.
1298 */
1299 if (tape->door_locked) {
1300 if (!ide_set_media_lock(drive, disk, 0))
1301 tape->door_locked = DOOR_UNLOCKED;
1302 }
1303 ide_tape_discard_merge_buffer(drive, 0);
1304 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1305 if (!retval)
1306 clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1307 &drive->atapi_flags);
1308 return retval;
1309 case MTNOP:
1310 ide_tape_discard_merge_buffer(drive, 0);
1311 return idetape_flush_tape_buffers(drive);
1312 case MTRETEN:
1313 ide_tape_discard_merge_buffer(drive, 0);
1314 return ide_do_start_stop(drive, disk,
1315 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1316 case MTEOM:
1317 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1318 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1319 case MTERASE:
1320 (void)idetape_rewind_tape(drive);
1321 idetape_create_erase_cmd(&pc);
1322 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1323 case MTSETBLK:
1324 if (mt_count) {
1325 if (mt_count < tape->blk_size ||
1326 mt_count % tape->blk_size)
1327 return -EIO;
1328 tape->user_bs_factor = mt_count / tape->blk_size;
1329 clear_bit(ilog2(IDE_AFLAG_DETECT_BS),
1330 &drive->atapi_flags);
1331 } else
1332 set_bit(ilog2(IDE_AFLAG_DETECT_BS),
1333 &drive->atapi_flags);
1334 return 0;
1335 case MTSEEK:
1336 ide_tape_discard_merge_buffer(drive, 0);
1337 return idetape_position_tape(drive,
1338 mt_count * tape->user_bs_factor, tape->partition, 0);
1339 case MTSETPART:
1340 ide_tape_discard_merge_buffer(drive, 0);
1341 return idetape_position_tape(drive, 0, mt_count, 0);
1342 case MTFSR:
1343 case MTBSR:
1344 case MTLOCK:
1345 retval = ide_set_media_lock(drive, disk, 1);
1346 if (retval)
1347 return retval;
1348 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1349 return 0;
1350 case MTUNLOCK:
1351 retval = ide_set_media_lock(drive, disk, 0);
1352 if (retval)
1353 return retval;
1354 tape->door_locked = DOOR_UNLOCKED;
1355 return 0;
1356 default:
1357 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1358 mt_op);
1359 return -EIO;
1360 }
1361}
1362
1363/*
1364 * Our character device ioctls. General mtio.h magnetic io commands are
1365 * supported here, and not in the corresponding block interface. Our own
1366 * ide-tape ioctls are supported on both interfaces.
1367 */
1368static long do_idetape_chrdev_ioctl(struct file *file,
1369 unsigned int cmd, unsigned long arg)
1370{
1371 struct ide_tape_obj *tape = file->private_data;
1372 ide_drive_t *drive = tape->drive;
1373 struct mtop mtop;
1374 struct mtget mtget;
1375 struct mtpos mtpos;
1376 int block_offset = 0, position = tape->first_frame;
1377 void __user *argp = (void __user *)arg;
1378
1379 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd);
1380
1381 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1382 ide_tape_flush_merge_buffer(drive);
1383 idetape_flush_tape_buffers(drive);
1384 }
1385 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1386 block_offset = tape->valid /
1387 (tape->blk_size * tape->user_bs_factor);
1388 position = ide_tape_read_position(drive);
1389 if (position < 0)
1390 return -EIO;
1391 }
1392 switch (cmd) {
1393 case MTIOCTOP:
1394 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1395 return -EFAULT;
1396 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1397 case MTIOCGET:
1398 memset(&mtget, 0, sizeof(struct mtget));
1399 mtget.mt_type = MT_ISSCSI2;
1400 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1401 mtget.mt_dsreg =
1402 ((tape->blk_size * tape->user_bs_factor)
1403 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1404
1405 if (tape->drv_write_prot)
1406 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1407
1408 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1409 return -EFAULT;
1410 return 0;
1411 case MTIOCPOS:
1412 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1413 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1414 return -EFAULT;
1415 return 0;
1416 default:
1417 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1418 ide_tape_discard_merge_buffer(drive, 1);
1419 return idetape_blkdev_ioctl(drive, cmd, arg);
1420 }
1421}
1422
1423static long idetape_chrdev_ioctl(struct file *file,
1424 unsigned int cmd, unsigned long arg)
1425{
1426 long ret;
1427 mutex_lock(&ide_tape_mutex);
1428 ret = do_idetape_chrdev_ioctl(file, cmd, arg);
1429 mutex_unlock(&ide_tape_mutex);
1430 return ret;
1431}
1432
1433/*
1434 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1435 * block size with the reported value.
1436 */
1437static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1438{
1439 idetape_tape_t *tape = drive->driver_data;
1440 struct ide_atapi_pc pc;
1441 u8 buf[12];
1442
1443 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1444 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1445 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1446 if (tape->blk_size == 0) {
1447 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1448 "block size, assuming 32k\n");
1449 tape->blk_size = 32768;
1450 }
1451 return;
1452 }
1453 tape->blk_size = (buf[4 + 5] << 16) +
1454 (buf[4 + 6] << 8) +
1455 buf[4 + 7];
1456 tape->drv_write_prot = (buf[2] & 0x80) >> 7;
1457
1458 ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d",
1459 tape->blk_size, tape->drv_write_prot);
1460}
1461
1462static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1463{
1464 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1465 ide_drive_t *drive;
1466 idetape_tape_t *tape;
1467 int retval;
1468
1469 if (i >= MAX_HWIFS * MAX_DRIVES)
1470 return -ENXIO;
1471
1472 mutex_lock(&idetape_chrdev_mutex);
1473
1474 tape = ide_tape_get(NULL, true, i);
1475 if (!tape) {
1476 mutex_unlock(&idetape_chrdev_mutex);
1477 return -ENXIO;
1478 }
1479
1480 drive = tape->drive;
1481 filp->private_data = tape;
1482
1483 ide_debug_log(IDE_DBG_FUNC, "enter");
1484
1485 /*
1486 * We really want to do nonseekable_open(inode, filp); here, but some
1487 * versions of tar incorrectly call lseek on tapes and bail out if that
1488 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1489 */
1490 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1491
1492
1493 if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) {
1494 retval = -EBUSY;
1495 goto out_put_tape;
1496 }
1497
1498 retval = idetape_wait_ready(drive, 60 * HZ);
1499 if (retval) {
1500 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1501 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1502 goto out_put_tape;
1503 }
1504
1505 ide_tape_read_position(drive);
1506 if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags))
1507 (void)idetape_rewind_tape(drive);
1508
1509 /* Read block size and write protect status from drive. */
1510 ide_tape_get_bsize_from_bdesc(drive);
1511
1512 /* Set write protect flag if device is opened as read-only. */
1513 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1514 tape->write_prot = 1;
1515 else
1516 tape->write_prot = tape->drv_write_prot;
1517
1518 /* Make sure drive isn't write protected if user wants to write. */
1519 if (tape->write_prot) {
1520 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1521 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1522 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1523 retval = -EROFS;
1524 goto out_put_tape;
1525 }
1526 }
1527
1528 /* Lock the tape drive door so user can't eject. */
1529 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1530 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1531 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1532 tape->door_locked = DOOR_LOCKED;
1533 }
1534 }
1535 mutex_unlock(&idetape_chrdev_mutex);
1536
1537 return 0;
1538
1539out_put_tape:
1540 ide_tape_put(tape);
1541
1542 mutex_unlock(&idetape_chrdev_mutex);
1543
1544 return retval;
1545}
1546
1547static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1548{
1549 idetape_tape_t *tape = drive->driver_data;
1550
1551 ide_tape_flush_merge_buffer(drive);
1552 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1553 if (tape->buf != NULL) {
1554 idetape_pad_zeros(drive, tape->blk_size *
1555 (tape->user_bs_factor - 1));
1556 kfree(tape->buf);
1557 tape->buf = NULL;
1558 }
1559 idetape_write_filemark(drive);
1560 idetape_flush_tape_buffers(drive);
1561 idetape_flush_tape_buffers(drive);
1562}
1563
1564static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1565{
1566 struct ide_tape_obj *tape = filp->private_data;
1567 ide_drive_t *drive = tape->drive;
1568 unsigned int minor = iminor(inode);
1569
1570 mutex_lock(&idetape_chrdev_mutex);
1571
1572 tape = drive->driver_data;
1573
1574 ide_debug_log(IDE_DBG_FUNC, "enter");
1575
1576 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1577 idetape_write_release(drive, minor);
1578 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1579 if (minor < 128)
1580 ide_tape_discard_merge_buffer(drive, 1);
1581 }
1582
1583 if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1584 &drive->atapi_flags))
1585 (void) idetape_rewind_tape(drive);
1586
1587 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1588 if (tape->door_locked == DOOR_LOCKED) {
1589 if (!ide_set_media_lock(drive, tape->disk, 0))
1590 tape->door_locked = DOOR_UNLOCKED;
1591 }
1592 }
1593 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1594 ide_tape_put(tape);
1595
1596 mutex_unlock(&idetape_chrdev_mutex);
1597
1598 return 0;
1599}
1600
1601static void idetape_get_inquiry_results(ide_drive_t *drive)
1602{
1603 idetape_tape_t *tape = drive->driver_data;
1604 struct ide_atapi_pc pc;
1605 u8 pc_buf[256];
1606 char fw_rev[4], vendor_id[8], product_id[16];
1607
1608 idetape_create_inquiry_cmd(&pc);
1609 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
1610 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
1611 tape->name);
1612 return;
1613 }
1614 memcpy(vendor_id, &pc_buf[8], 8);
1615 memcpy(product_id, &pc_buf[16], 16);
1616 memcpy(fw_rev, &pc_buf[32], 4);
1617
1618 ide_fixstring(vendor_id, 8, 0);
1619 ide_fixstring(product_id, 16, 0);
1620 ide_fixstring(fw_rev, 4, 0);
1621
1622 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1623 drive->name, tape->name, vendor_id, product_id, fw_rev);
1624}
1625
1626/*
1627 * Ask the tape about its various parameters. In particular, we will adjust our
1628 * data transfer buffer size to the recommended value as returned by the tape.
1629 */
1630static void idetape_get_mode_sense_results(ide_drive_t *drive)
1631{
1632 idetape_tape_t *tape = drive->driver_data;
1633 struct ide_atapi_pc pc;
1634 u8 buf[24], *caps;
1635 u8 speed, max_speed;
1636
1637 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
1638 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1639 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
1640 " some default values\n");
1641 tape->blk_size = 512;
1642 put_unaligned(52, (u16 *)&tape->caps[12]);
1643 put_unaligned(540, (u16 *)&tape->caps[14]);
1644 put_unaligned(6*52, (u16 *)&tape->caps[16]);
1645 return;
1646 }
1647 caps = buf + 4 + buf[3];
1648
1649 /* convert to host order and save for later use */
1650 speed = be16_to_cpup((__be16 *)&caps[14]);
1651 max_speed = be16_to_cpup((__be16 *)&caps[8]);
1652
1653 *(u16 *)&caps[8] = max_speed;
1654 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
1655 *(u16 *)&caps[14] = speed;
1656 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
1657
1658 if (!speed) {
1659 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
1660 "(assuming 650KB/sec)\n", drive->name);
1661 *(u16 *)&caps[14] = 650;
1662 }
1663 if (!max_speed) {
1664 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
1665 "(assuming 650KB/sec)\n", drive->name);
1666 *(u16 *)&caps[8] = 650;
1667 }
1668
1669 memcpy(&tape->caps, caps, 20);
1670
1671 /* device lacks locking support according to capabilities page */
1672 if ((caps[6] & 1) == 0)
1673 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1674
1675 if (caps[7] & 0x02)
1676 tape->blk_size = 512;
1677 else if (caps[7] & 0x04)
1678 tape->blk_size = 1024;
1679}
1680
1681#ifdef CONFIG_IDE_PROC_FS
1682#define ide_tape_devset_get(name, field) \
1683static int get_##name(ide_drive_t *drive) \
1684{ \
1685 idetape_tape_t *tape = drive->driver_data; \
1686 return tape->field; \
1687}
1688
1689#define ide_tape_devset_set(name, field) \
1690static int set_##name(ide_drive_t *drive, int arg) \
1691{ \
1692 idetape_tape_t *tape = drive->driver_data; \
1693 tape->field = arg; \
1694 return 0; \
1695}
1696
1697#define ide_tape_devset_rw_field(_name, _field) \
1698ide_tape_devset_get(_name, _field) \
1699ide_tape_devset_set(_name, _field) \
1700IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1701
1702#define ide_tape_devset_r_field(_name, _field) \
1703ide_tape_devset_get(_name, _field) \
1704IDE_DEVSET(_name, 0, get_##_name, NULL)
1705
1706static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
1707static int divf_tdsc(ide_drive_t *drive) { return HZ; }
1708static int divf_buffer(ide_drive_t *drive) { return 2; }
1709static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
1710
1711ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1712
1713ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
1714
1715ide_tape_devset_r_field(avg_speed, avg_speed);
1716ide_tape_devset_r_field(speed, caps[14]);
1717ide_tape_devset_r_field(buffer, caps[16]);
1718ide_tape_devset_r_field(buffer_size, buffer_size);
1719
1720static const struct ide_proc_devset idetape_settings[] = {
1721 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
1722 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
1723 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
1724 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
1725 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
1726 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
1727 mulf_tdsc, divf_tdsc),
1728 { NULL },
1729};
1730#endif
1731
1732/*
1733 * The function below is called to:
1734 *
1735 * 1. Initialize our various state variables.
1736 * 2. Ask the tape for its capabilities.
1737 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1738 * is chosen based on the recommendation which we received in step 2.
1739 *
1740 * Note that at this point ide.c already assigned us an irq, so that we can
1741 * queue requests here and wait for their completion.
1742 */
1743static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1744{
1745 unsigned long t;
1746 int speed;
1747 int buffer_size;
1748 u16 *ctl = (u16 *)&tape->caps[12];
1749
1750 ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor);
1751
1752 drive->pc_callback = ide_tape_callback;
1753
1754 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1755
1756 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1757 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1758 tape->name);
1759 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1760 }
1761
1762 /* Seagate Travan drives do not support DSC overlap. */
1763 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1764 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1765
1766 tape->minor = minor;
1767 tape->name[0] = 'h';
1768 tape->name[1] = 't';
1769 tape->name[2] = '0' + minor;
1770 tape->chrdev_dir = IDETAPE_DIR_NONE;
1771
1772 idetape_get_inquiry_results(drive);
1773 idetape_get_mode_sense_results(drive);
1774 ide_tape_get_bsize_from_bdesc(drive);
1775 tape->user_bs_factor = 1;
1776 tape->buffer_size = *ctl * tape->blk_size;
1777 while (tape->buffer_size > 0xffff) {
1778 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1779 *ctl /= 2;
1780 tape->buffer_size = *ctl * tape->blk_size;
1781 }
1782 buffer_size = tape->buffer_size;
1783
1784 /* select the "best" DSC read/write polling freq */
1785 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1786
1787 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
1788
1789 /*
1790 * Ensure that the number we got makes sense; limit it within
1791 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1792 */
1793 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
1794 IDETAPE_DSC_RW_MAX);
1795 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1796 "%ums tDSC%s\n",
1797 drive->name, tape->name, *(u16 *)&tape->caps[14],
1798 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
1799 tape->buffer_size / 1024,
1800 jiffies_to_msecs(tape->best_dsc_rw_freq),
1801 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
1802
1803 ide_proc_register_driver(drive, tape->driver);
1804}
1805
1806static void ide_tape_remove(ide_drive_t *drive)
1807{
1808 idetape_tape_t *tape = drive->driver_data;
1809
1810 ide_proc_unregister_driver(drive, tape->driver);
1811 device_del(&tape->dev);
1812 ide_unregister_region(tape->disk);
1813
1814 mutex_lock(&idetape_ref_mutex);
1815 put_device(&tape->dev);
1816 mutex_unlock(&idetape_ref_mutex);
1817}
1818
1819static void ide_tape_release(struct device *dev)
1820{
1821 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
1822 ide_drive_t *drive = tape->drive;
1823 struct gendisk *g = tape->disk;
1824
1825 BUG_ON(tape->valid);
1826
1827 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1828 drive->driver_data = NULL;
1829 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
1830 device_destroy(idetape_sysfs_class,
1831 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1832 idetape_devs[tape->minor] = NULL;
1833 g->private_data = NULL;
1834 put_disk(g);
1835 kfree(tape);
1836}
1837
1838#ifdef CONFIG_IDE_PROC_FS
1839static int idetape_name_proc_show(struct seq_file *m, void *v)
1840{
1841 ide_drive_t *drive = (ide_drive_t *) m->private;
1842 idetape_tape_t *tape = drive->driver_data;
1843
1844 seq_printf(m, "%s\n", tape->name);
1845 return 0;
1846}
1847
1848static int idetape_name_proc_open(struct inode *inode, struct file *file)
1849{
1850 return single_open(file, idetape_name_proc_show, PDE_DATA(inode));
1851}
1852
1853static const struct file_operations idetape_name_proc_fops = {
1854 .owner = THIS_MODULE,
1855 .open = idetape_name_proc_open,
1856 .read = seq_read,
1857 .llseek = seq_lseek,
1858 .release = single_release,
1859};
1860
1861static ide_proc_entry_t idetape_proc[] = {
1862 { "capacity", S_IFREG|S_IRUGO, &ide_capacity_proc_fops },
1863 { "name", S_IFREG|S_IRUGO, &idetape_name_proc_fops },
1864 {}
1865};
1866
1867static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
1868{
1869 return idetape_proc;
1870}
1871
1872static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
1873{
1874 return idetape_settings;
1875}
1876#endif
1877
1878static int ide_tape_probe(ide_drive_t *);
1879
1880static struct ide_driver idetape_driver = {
1881 .gen_driver = {
1882 .owner = THIS_MODULE,
1883 .name = "ide-tape",
1884 .bus = &ide_bus_type,
1885 },
1886 .probe = ide_tape_probe,
1887 .remove = ide_tape_remove,
1888 .version = IDETAPE_VERSION,
1889 .do_request = idetape_do_request,
1890#ifdef CONFIG_IDE_PROC_FS
1891 .proc_entries = ide_tape_proc_entries,
1892 .proc_devsets = ide_tape_proc_devsets,
1893#endif
1894};
1895
1896/* Our character device supporting functions, passed to register_chrdev. */
1897static const struct file_operations idetape_fops = {
1898 .owner = THIS_MODULE,
1899 .read = idetape_chrdev_read,
1900 .write = idetape_chrdev_write,
1901 .unlocked_ioctl = idetape_chrdev_ioctl,
1902 .open = idetape_chrdev_open,
1903 .release = idetape_chrdev_release,
1904 .llseek = noop_llseek,
1905};
1906
1907static int idetape_open(struct block_device *bdev, fmode_t mode)
1908{
1909 struct ide_tape_obj *tape;
1910
1911 mutex_lock(&ide_tape_mutex);
1912 tape = ide_tape_get(bdev->bd_disk, false, 0);
1913 mutex_unlock(&ide_tape_mutex);
1914
1915 if (!tape)
1916 return -ENXIO;
1917
1918 return 0;
1919}
1920
1921static void idetape_release(struct gendisk *disk, fmode_t mode)
1922{
1923 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1924
1925 mutex_lock(&ide_tape_mutex);
1926 ide_tape_put(tape);
1927 mutex_unlock(&ide_tape_mutex);
1928}
1929
1930static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1931 unsigned int cmd, unsigned long arg)
1932{
1933 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1934 ide_drive_t *drive = tape->drive;
1935 int err;
1936
1937 mutex_lock(&ide_tape_mutex);
1938 err = generic_ide_ioctl(drive, bdev, cmd, arg);
1939 if (err == -EINVAL)
1940 err = idetape_blkdev_ioctl(drive, cmd, arg);
1941 mutex_unlock(&ide_tape_mutex);
1942
1943 return err;
1944}
1945
1946static const struct block_device_operations idetape_block_ops = {
1947 .owner = THIS_MODULE,
1948 .open = idetape_open,
1949 .release = idetape_release,
1950 .ioctl = idetape_ioctl,
1951};
1952
1953static int ide_tape_probe(ide_drive_t *drive)
1954{
1955 idetape_tape_t *tape;
1956 struct gendisk *g;
1957 int minor;
1958
1959 ide_debug_log(IDE_DBG_FUNC, "enter");
1960
1961 if (!strstr(DRV_NAME, drive->driver_req))
1962 goto failed;
1963
1964 if (drive->media != ide_tape)
1965 goto failed;
1966
1967 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1968 ide_check_atapi_device(drive, DRV_NAME) == 0) {
1969 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1970 " the driver\n", drive->name);
1971 goto failed;
1972 }
1973 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1974 if (tape == NULL) {
1975 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1976 drive->name);
1977 goto failed;
1978 }
1979
1980 g = alloc_disk(1 << PARTN_BITS);
1981 if (!g)
1982 goto out_free_tape;
1983
1984 ide_init_disk(g, drive);
1985
1986 tape->dev.parent = &drive->gendev;
1987 tape->dev.release = ide_tape_release;
1988 dev_set_name(&tape->dev, "%s", dev_name(&drive->gendev));
1989
1990 if (device_register(&tape->dev))
1991 goto out_free_disk;
1992
1993 tape->drive = drive;
1994 tape->driver = &idetape_driver;
1995 tape->disk = g;
1996
1997 g->private_data = &tape->driver;
1998
1999 drive->driver_data = tape;
2000
2001 mutex_lock(&idetape_ref_mutex);
2002 for (minor = 0; idetape_devs[minor]; minor++)
2003 ;
2004 idetape_devs[minor] = tape;
2005 mutex_unlock(&idetape_ref_mutex);
2006
2007 idetape_setup(drive, tape, minor);
2008
2009 device_create(idetape_sysfs_class, &drive->gendev,
2010 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2011 device_create(idetape_sysfs_class, &drive->gendev,
2012 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2013 "n%s", tape->name);
2014
2015 g->fops = &idetape_block_ops;
2016 ide_register_region(g);
2017
2018 return 0;
2019
2020out_free_disk:
2021 put_disk(g);
2022out_free_tape:
2023 kfree(tape);
2024failed:
2025 return -ENODEV;
2026}
2027
2028static void __exit idetape_exit(void)
2029{
2030 driver_unregister(&idetape_driver.gen_driver);
2031 class_destroy(idetape_sysfs_class);
2032 unregister_chrdev(IDETAPE_MAJOR, "ht");
2033}
2034
2035static int __init idetape_init(void)
2036{
2037 int error = 1;
2038 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2039 if (IS_ERR(idetape_sysfs_class)) {
2040 idetape_sysfs_class = NULL;
2041 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2042 error = -EBUSY;
2043 goto out;
2044 }
2045
2046 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2047 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2048 " interface\n");
2049 error = -EBUSY;
2050 goto out_free_class;
2051 }
2052
2053 error = driver_register(&idetape_driver.gen_driver);
2054 if (error)
2055 goto out_free_driver;
2056
2057 return 0;
2058
2059out_free_driver:
2060 driver_unregister(&idetape_driver.gen_driver);
2061out_free_class:
2062 class_destroy(idetape_sysfs_class);
2063out:
2064 return error;
2065}
2066
2067MODULE_ALIAS("ide:*m-tape*");
2068module_init(idetape_init);
2069module_exit(idetape_exit);
2070MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2071MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2072MODULE_LICENSE("GPL");