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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 scsi_req(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) - scsi_req(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) - scsi_req(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 scsi_req(rq)->result = 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, BLK_STS_IOERR, 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(scsi_req(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 struct scsi_request *req = scsi_req(rq);
574 u8 stat;
575
576 ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
577 req->cmd[0], (unsigned long long)blk_rq_pos(rq),
578 blk_rq_sectors(rq));
579
580 BUG_ON(!blk_rq_is_private(rq));
581 BUG_ON(ide_req(rq)->type != ATA_PRIV_MISC &&
582 ide_req(rq)->type != ATA_PRIV_SENSE);
583
584 /* Retry a failed packet command */
585 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
586 pc = drive->failed_pc;
587 goto out;
588 }
589
590 /*
591 * If the tape is still busy, postpone our request and service
592 * the other device meanwhile.
593 */
594 stat = hwif->tp_ops->read_status(hwif);
595
596 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
597 (req->cmd[13] & REQ_IDETAPE_PC2) == 0)
598 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
599
600 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
601 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
602 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
603 }
604
605 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
606 !(stat & ATA_DSC)) {
607 if (!tape->postponed_rq) {
608 tape->dsc_polling_start = jiffies;
609 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
610 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
611 } else if (time_after(jiffies, tape->dsc_timeout)) {
612 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
613 tape->name);
614 if (req->cmd[13] & REQ_IDETAPE_PC2) {
615 idetape_media_access_finished(drive);
616 return ide_stopped;
617 } else {
618 return ide_do_reset(drive);
619 }
620 } else if (time_after(jiffies,
621 tape->dsc_polling_start +
622 IDETAPE_DSC_MA_THRESHOLD))
623 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
624 ide_tape_stall_queue(drive);
625 return ide_stopped;
626 } else {
627 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
628 tape->postponed_rq = false;
629 }
630
631 if (req->cmd[13] & REQ_IDETAPE_READ) {
632 pc = &tape->queued_pc;
633 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
634 goto out;
635 }
636 if (req->cmd[13] & REQ_IDETAPE_WRITE) {
637 pc = &tape->queued_pc;
638 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
639 goto out;
640 }
641 if (req->cmd[13] & REQ_IDETAPE_PC1) {
642 pc = (struct ide_atapi_pc *)ide_req(rq)->special;
643 req->cmd[13] &= ~(REQ_IDETAPE_PC1);
644 req->cmd[13] |= REQ_IDETAPE_PC2;
645 goto out;
646 }
647 if (req->cmd[13] & REQ_IDETAPE_PC2) {
648 idetape_media_access_finished(drive);
649 return ide_stopped;
650 }
651 BUG();
652
653out:
654 /* prepare sense request for this command */
655 ide_prep_sense(drive, rq);
656
657 memset(&cmd, 0, sizeof(cmd));
658
659 if (rq_data_dir(rq))
660 cmd.tf_flags |= IDE_TFLAG_WRITE;
661
662 cmd.rq = rq;
663
664 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
665 ide_map_sg(drive, &cmd);
666
667 return ide_tape_issue_pc(drive, &cmd, pc);
668}
669
670/*
671 * Write a filemark if write_filemark=1. Flush the device buffers without
672 * writing a filemark otherwise.
673 */
674static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
675 struct ide_atapi_pc *pc, int write_filemark)
676{
677 ide_init_pc(pc);
678 pc->c[0] = WRITE_FILEMARKS;
679 pc->c[4] = write_filemark;
680 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
681}
682
683static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
684{
685 idetape_tape_t *tape = drive->driver_data;
686 struct gendisk *disk = tape->disk;
687 int load_attempted = 0;
688
689 /* Wait for the tape to become ready */
690 set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags);
691 timeout += jiffies;
692 while (time_before(jiffies, timeout)) {
693 if (ide_do_test_unit_ready(drive, disk) == 0)
694 return 0;
695 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
696 || (tape->asc == 0x3A)) {
697 /* no media */
698 if (load_attempted)
699 return -ENOMEDIUM;
700 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
701 load_attempted = 1;
702 /* not about to be ready */
703 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
704 (tape->ascq == 1 || tape->ascq == 8)))
705 return -EIO;
706 msleep(100);
707 }
708 return -EIO;
709}
710
711static int idetape_flush_tape_buffers(ide_drive_t *drive)
712{
713 struct ide_tape_obj *tape = drive->driver_data;
714 struct ide_atapi_pc pc;
715 int rc;
716
717 idetape_create_write_filemark_cmd(drive, &pc, 0);
718 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
719 if (rc)
720 return rc;
721 idetape_wait_ready(drive, 60 * 5 * HZ);
722 return 0;
723}
724
725static int ide_tape_read_position(ide_drive_t *drive)
726{
727 idetape_tape_t *tape = drive->driver_data;
728 struct ide_atapi_pc pc;
729 u8 buf[20];
730
731 ide_debug_log(IDE_DBG_FUNC, "enter");
732
733 /* prep cmd */
734 ide_init_pc(&pc);
735 pc.c[0] = READ_POSITION;
736 pc.req_xfer = 20;
737
738 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
739 return -1;
740
741 if (!pc.error) {
742 ide_debug_log(IDE_DBG_FUNC, "BOP - %s",
743 (buf[0] & 0x80) ? "Yes" : "No");
744 ide_debug_log(IDE_DBG_FUNC, "EOP - %s",
745 (buf[0] & 0x40) ? "Yes" : "No");
746
747 if (buf[0] & 0x4) {
748 printk(KERN_INFO "ide-tape: Block location is unknown"
749 "to the tape\n");
750 clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
751 &drive->atapi_flags);
752 return -1;
753 } else {
754 ide_debug_log(IDE_DBG_FUNC, "Block Location: %u",
755 be32_to_cpup((__be32 *)&buf[4]));
756
757 tape->partition = buf[1];
758 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
759 set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
760 &drive->atapi_flags);
761 }
762 }
763
764 return tape->first_frame;
765}
766
767static void idetape_create_locate_cmd(ide_drive_t *drive,
768 struct ide_atapi_pc *pc,
769 unsigned int block, u8 partition, int skip)
770{
771 ide_init_pc(pc);
772 pc->c[0] = POSITION_TO_ELEMENT;
773 pc->c[1] = 2;
774 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
775 pc->c[8] = partition;
776 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
777}
778
779static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
780{
781 idetape_tape_t *tape = drive->driver_data;
782
783 if (tape->chrdev_dir != IDETAPE_DIR_READ)
784 return;
785
786 clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags);
787 tape->valid = 0;
788 if (tape->buf != NULL) {
789 kfree(tape->buf);
790 tape->buf = NULL;
791 }
792
793 tape->chrdev_dir = IDETAPE_DIR_NONE;
794}
795
796/*
797 * Position the tape to the requested block using the LOCATE packet command.
798 * A READ POSITION command is then issued to check where we are positioned. Like
799 * all higher level operations, we queue the commands at the tail of the request
800 * queue and wait for their completion.
801 */
802static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
803 u8 partition, int skip)
804{
805 idetape_tape_t *tape = drive->driver_data;
806 struct gendisk *disk = tape->disk;
807 int ret;
808 struct ide_atapi_pc pc;
809
810 if (tape->chrdev_dir == IDETAPE_DIR_READ)
811 __ide_tape_discard_merge_buffer(drive);
812 idetape_wait_ready(drive, 60 * 5 * HZ);
813 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
814 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
815 if (ret)
816 return ret;
817
818 ret = ide_tape_read_position(drive);
819 if (ret < 0)
820 return ret;
821 return 0;
822}
823
824static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
825 int restore_position)
826{
827 idetape_tape_t *tape = drive->driver_data;
828 int seek, position;
829
830 __ide_tape_discard_merge_buffer(drive);
831 if (restore_position) {
832 position = ide_tape_read_position(drive);
833 seek = position > 0 ? position : 0;
834 if (idetape_position_tape(drive, seek, 0, 0)) {
835 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
836 " %s\n", tape->name, __func__);
837 return;
838 }
839 }
840}
841
842/*
843 * Generate a read/write request for the block device interface and wait for it
844 * to be serviced.
845 */
846static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
847{
848 idetape_tape_t *tape = drive->driver_data;
849 struct request *rq;
850 int ret;
851
852 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size);
853
854 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
855 BUG_ON(size < 0 || size % tape->blk_size);
856
857 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
858 ide_req(rq)->type = ATA_PRIV_MISC;
859 scsi_req(rq)->cmd[13] = cmd;
860 rq->rq_disk = tape->disk;
861 rq->__sector = tape->first_frame;
862
863 if (size) {
864 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
865 GFP_NOIO);
866 if (ret)
867 goto out_put;
868 }
869
870 blk_execute_rq(drive->queue, tape->disk, rq, 0);
871
872 /* calculate the number of transferred bytes and update buffer state */
873 size -= scsi_req(rq)->resid_len;
874 tape->cur = tape->buf;
875 if (cmd == REQ_IDETAPE_READ)
876 tape->valid = size;
877 else
878 tape->valid = 0;
879
880 ret = size;
881 if (scsi_req(rq)->result == IDE_DRV_ERROR_GENERAL)
882 ret = -EIO;
883out_put:
884 blk_put_request(rq);
885 return ret;
886}
887
888static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
889{
890 ide_init_pc(pc);
891 pc->c[0] = INQUIRY;
892 pc->c[4] = 254;
893 pc->req_xfer = 254;
894}
895
896static void idetape_create_rewind_cmd(ide_drive_t *drive,
897 struct ide_atapi_pc *pc)
898{
899 ide_init_pc(pc);
900 pc->c[0] = REZERO_UNIT;
901 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
902}
903
904static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
905{
906 ide_init_pc(pc);
907 pc->c[0] = ERASE;
908 pc->c[1] = 1;
909 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
910}
911
912static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
913{
914 ide_init_pc(pc);
915 pc->c[0] = SPACE;
916 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
917 pc->c[1] = cmd;
918 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
919}
920
921static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
922{
923 idetape_tape_t *tape = drive->driver_data;
924
925 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
926 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
927 " but we are not writing.\n");
928 return;
929 }
930 if (tape->buf) {
931 size_t aligned = roundup(tape->valid, tape->blk_size);
932
933 memset(tape->cur, 0, aligned - tape->valid);
934 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
935 kfree(tape->buf);
936 tape->buf = NULL;
937 }
938 tape->chrdev_dir = IDETAPE_DIR_NONE;
939}
940
941static int idetape_init_rw(ide_drive_t *drive, int dir)
942{
943 idetape_tape_t *tape = drive->driver_data;
944 int rc;
945
946 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
947
948 if (tape->chrdev_dir == dir)
949 return 0;
950
951 if (tape->chrdev_dir == IDETAPE_DIR_READ)
952 ide_tape_discard_merge_buffer(drive, 1);
953 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
954 ide_tape_flush_merge_buffer(drive);
955 idetape_flush_tape_buffers(drive);
956 }
957
958 if (tape->buf || tape->valid) {
959 printk(KERN_ERR "ide-tape: valid should be 0 now\n");
960 tape->valid = 0;
961 }
962
963 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
964 if (!tape->buf)
965 return -ENOMEM;
966 tape->chrdev_dir = dir;
967 tape->cur = tape->buf;
968
969 /*
970 * Issue a 0 rw command to ensure that DSC handshake is
971 * switched from completion mode to buffer available mode. No
972 * point in issuing this if DSC overlap isn't supported, some
973 * drives (Seagate STT3401A) will return an error.
974 */
975 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
976 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
977 : REQ_IDETAPE_WRITE;
978
979 rc = idetape_queue_rw_tail(drive, cmd, 0);
980 if (rc < 0) {
981 kfree(tape->buf);
982 tape->buf = NULL;
983 tape->chrdev_dir = IDETAPE_DIR_NONE;
984 return rc;
985 }
986 }
987
988 return 0;
989}
990
991static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
992{
993 idetape_tape_t *tape = drive->driver_data;
994
995 memset(tape->buf, 0, tape->buffer_size);
996
997 while (bcount) {
998 unsigned int count = min(tape->buffer_size, bcount);
999
1000 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
1001 bcount -= count;
1002 }
1003}
1004
1005/*
1006 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1007 * currently support only one partition.
1008 */
1009static int idetape_rewind_tape(ide_drive_t *drive)
1010{
1011 struct ide_tape_obj *tape = drive->driver_data;
1012 struct gendisk *disk = tape->disk;
1013 struct ide_atapi_pc pc;
1014 int ret;
1015
1016 ide_debug_log(IDE_DBG_FUNC, "enter");
1017
1018 idetape_create_rewind_cmd(drive, &pc);
1019 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1020 if (ret)
1021 return ret;
1022
1023 ret = ide_tape_read_position(drive);
1024 if (ret < 0)
1025 return ret;
1026 return 0;
1027}
1028
1029/* mtio.h compatible commands should be issued to the chrdev interface. */
1030static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1031 unsigned long arg)
1032{
1033 idetape_tape_t *tape = drive->driver_data;
1034 void __user *argp = (void __user *)arg;
1035
1036 struct idetape_config {
1037 int dsc_rw_frequency;
1038 int dsc_media_access_frequency;
1039 int nr_stages;
1040 } config;
1041
1042 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd);
1043
1044 switch (cmd) {
1045 case 0x0340:
1046 if (copy_from_user(&config, argp, sizeof(config)))
1047 return -EFAULT;
1048 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1049 break;
1050 case 0x0350:
1051 memset(&config, 0, sizeof(config));
1052 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1053 config.nr_stages = 1;
1054 if (copy_to_user(argp, &config, sizeof(config)))
1055 return -EFAULT;
1056 break;
1057 default:
1058 return -EIO;
1059 }
1060 return 0;
1061}
1062
1063static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1064 int mt_count)
1065{
1066 idetape_tape_t *tape = drive->driver_data;
1067 struct gendisk *disk = tape->disk;
1068 struct ide_atapi_pc pc;
1069 int retval, count = 0;
1070 int sprev = !!(tape->caps[4] & 0x20);
1071
1072
1073 ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count);
1074
1075 if (mt_count == 0)
1076 return 0;
1077 if (MTBSF == mt_op || MTBSFM == mt_op) {
1078 if (!sprev)
1079 return -EIO;
1080 mt_count = -mt_count;
1081 }
1082
1083 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1084 tape->valid = 0;
1085 if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK),
1086 &drive->atapi_flags))
1087 ++count;
1088 ide_tape_discard_merge_buffer(drive, 0);
1089 }
1090
1091 switch (mt_op) {
1092 case MTFSF:
1093 case MTBSF:
1094 idetape_create_space_cmd(&pc, mt_count - count,
1095 IDETAPE_SPACE_OVER_FILEMARK);
1096 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1097 case MTFSFM:
1098 case MTBSFM:
1099 if (!sprev)
1100 return -EIO;
1101 retval = idetape_space_over_filemarks(drive, MTFSF,
1102 mt_count - count);
1103 if (retval)
1104 return retval;
1105 count = (MTBSFM == mt_op ? 1 : -1);
1106 return idetape_space_over_filemarks(drive, MTFSF, count);
1107 default:
1108 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1109 mt_op);
1110 return -EIO;
1111 }
1112}
1113
1114/*
1115 * Our character device read / write functions.
1116 *
1117 * The tape is optimized to maximize throughput when it is transferring an
1118 * integral number of the "continuous transfer limit", which is a parameter of
1119 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1120 *
1121 * As of version 1.3 of the driver, the character device provides an abstract
1122 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1123 * same backup/restore procedure is supported. The driver will internally
1124 * convert the requests to the recommended transfer unit, so that an unmatch
1125 * between the user's block size to the recommended size will only result in a
1126 * (slightly) increased driver overhead, but will no longer hit performance.
1127 * This is not applicable to Onstream.
1128 */
1129static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1130 size_t count, loff_t *ppos)
1131{
1132 struct ide_tape_obj *tape = file->private_data;
1133 ide_drive_t *drive = tape->drive;
1134 size_t done = 0;
1135 ssize_t ret = 0;
1136 int rc;
1137
1138 ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
1139
1140 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1141 if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags))
1142 if (count > tape->blk_size &&
1143 (count % tape->blk_size) == 0)
1144 tape->user_bs_factor = count / tape->blk_size;
1145 }
1146
1147 rc = idetape_init_rw(drive, IDETAPE_DIR_READ);
1148 if (rc < 0)
1149 return rc;
1150
1151 while (done < count) {
1152 size_t todo;
1153
1154 /* refill if staging buffer is empty */
1155 if (!tape->valid) {
1156 /* If we are at a filemark, nothing more to read */
1157 if (test_bit(ilog2(IDE_AFLAG_FILEMARK),
1158 &drive->atapi_flags))
1159 break;
1160 /* read */
1161 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
1162 tape->buffer_size) <= 0)
1163 break;
1164 }
1165
1166 /* copy out */
1167 todo = min_t(size_t, count - done, tape->valid);
1168 if (copy_to_user(buf + done, tape->cur, todo))
1169 ret = -EFAULT;
1170
1171 tape->cur += todo;
1172 tape->valid -= todo;
1173 done += todo;
1174 }
1175
1176 if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) {
1177 idetape_space_over_filemarks(drive, MTFSF, 1);
1178 return 0;
1179 }
1180
1181 return ret ? ret : done;
1182}
1183
1184static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1185 size_t count, loff_t *ppos)
1186{
1187 struct ide_tape_obj *tape = file->private_data;
1188 ide_drive_t *drive = tape->drive;
1189 size_t done = 0;
1190 ssize_t ret = 0;
1191 int rc;
1192
1193 /* The drive is write protected. */
1194 if (tape->write_prot)
1195 return -EACCES;
1196
1197 ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
1198
1199 /* Initialize write operation */
1200 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
1201 if (rc < 0)
1202 return rc;
1203
1204 while (done < count) {
1205 size_t todo;
1206
1207 /* flush if staging buffer is full */
1208 if (tape->valid == tape->buffer_size &&
1209 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1210 tape->buffer_size) <= 0)
1211 return rc;
1212
1213 /* copy in */
1214 todo = min_t(size_t, count - done,
1215 tape->buffer_size - tape->valid);
1216 if (copy_from_user(tape->cur, buf + done, todo))
1217 ret = -EFAULT;
1218
1219 tape->cur += todo;
1220 tape->valid += todo;
1221 done += todo;
1222 }
1223
1224 return ret ? ret : done;
1225}
1226
1227static int idetape_write_filemark(ide_drive_t *drive)
1228{
1229 struct ide_tape_obj *tape = drive->driver_data;
1230 struct ide_atapi_pc pc;
1231
1232 /* Write a filemark */
1233 idetape_create_write_filemark_cmd(drive, &pc, 1);
1234 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
1235 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1236 return -EIO;
1237 }
1238 return 0;
1239}
1240
1241/*
1242 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1243 * requested.
1244 *
1245 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1246 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1247 * usually not supported.
1248 *
1249 * The following commands are currently not supported:
1250 *
1251 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1252 * MT_ST_WRITE_THRESHOLD.
1253 */
1254static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1255{
1256 idetape_tape_t *tape = drive->driver_data;
1257 struct gendisk *disk = tape->disk;
1258 struct ide_atapi_pc pc;
1259 int i, retval;
1260
1261 ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d",
1262 mt_op, mt_count);
1263
1264 switch (mt_op) {
1265 case MTFSF:
1266 case MTFSFM:
1267 case MTBSF:
1268 case MTBSFM:
1269 if (!mt_count)
1270 return 0;
1271 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1272 default:
1273 break;
1274 }
1275
1276 switch (mt_op) {
1277 case MTWEOF:
1278 if (tape->write_prot)
1279 return -EACCES;
1280 ide_tape_discard_merge_buffer(drive, 1);
1281 for (i = 0; i < mt_count; i++) {
1282 retval = idetape_write_filemark(drive);
1283 if (retval)
1284 return retval;
1285 }
1286 return 0;
1287 case MTREW:
1288 ide_tape_discard_merge_buffer(drive, 0);
1289 if (idetape_rewind_tape(drive))
1290 return -EIO;
1291 return 0;
1292 case MTLOAD:
1293 ide_tape_discard_merge_buffer(drive, 0);
1294 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1295 case MTUNLOAD:
1296 case MTOFFL:
1297 /*
1298 * If door is locked, attempt to unlock before
1299 * attempting to eject.
1300 */
1301 if (tape->door_locked) {
1302 if (!ide_set_media_lock(drive, disk, 0))
1303 tape->door_locked = DOOR_UNLOCKED;
1304 }
1305 ide_tape_discard_merge_buffer(drive, 0);
1306 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1307 if (!retval)
1308 clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1309 &drive->atapi_flags);
1310 return retval;
1311 case MTNOP:
1312 ide_tape_discard_merge_buffer(drive, 0);
1313 return idetape_flush_tape_buffers(drive);
1314 case MTRETEN:
1315 ide_tape_discard_merge_buffer(drive, 0);
1316 return ide_do_start_stop(drive, disk,
1317 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1318 case MTEOM:
1319 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1320 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1321 case MTERASE:
1322 (void)idetape_rewind_tape(drive);
1323 idetape_create_erase_cmd(&pc);
1324 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1325 case MTSETBLK:
1326 if (mt_count) {
1327 if (mt_count < tape->blk_size ||
1328 mt_count % tape->blk_size)
1329 return -EIO;
1330 tape->user_bs_factor = mt_count / tape->blk_size;
1331 clear_bit(ilog2(IDE_AFLAG_DETECT_BS),
1332 &drive->atapi_flags);
1333 } else
1334 set_bit(ilog2(IDE_AFLAG_DETECT_BS),
1335 &drive->atapi_flags);
1336 return 0;
1337 case MTSEEK:
1338 ide_tape_discard_merge_buffer(drive, 0);
1339 return idetape_position_tape(drive,
1340 mt_count * tape->user_bs_factor, tape->partition, 0);
1341 case MTSETPART:
1342 ide_tape_discard_merge_buffer(drive, 0);
1343 return idetape_position_tape(drive, 0, mt_count, 0);
1344 case MTFSR:
1345 case MTBSR:
1346 case MTLOCK:
1347 retval = ide_set_media_lock(drive, disk, 1);
1348 if (retval)
1349 return retval;
1350 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1351 return 0;
1352 case MTUNLOCK:
1353 retval = ide_set_media_lock(drive, disk, 0);
1354 if (retval)
1355 return retval;
1356 tape->door_locked = DOOR_UNLOCKED;
1357 return 0;
1358 default:
1359 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1360 mt_op);
1361 return -EIO;
1362 }
1363}
1364
1365/*
1366 * Our character device ioctls. General mtio.h magnetic io commands are
1367 * supported here, and not in the corresponding block interface. Our own
1368 * ide-tape ioctls are supported on both interfaces.
1369 */
1370static long do_idetape_chrdev_ioctl(struct file *file,
1371 unsigned int cmd, unsigned long arg)
1372{
1373 struct ide_tape_obj *tape = file->private_data;
1374 ide_drive_t *drive = tape->drive;
1375 struct mtop mtop;
1376 struct mtget mtget;
1377 struct mtpos mtpos;
1378 int block_offset = 0, position = tape->first_frame;
1379 void __user *argp = (void __user *)arg;
1380
1381 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd);
1382
1383 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1384 ide_tape_flush_merge_buffer(drive);
1385 idetape_flush_tape_buffers(drive);
1386 }
1387 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1388 block_offset = tape->valid /
1389 (tape->blk_size * tape->user_bs_factor);
1390 position = ide_tape_read_position(drive);
1391 if (position < 0)
1392 return -EIO;
1393 }
1394 switch (cmd) {
1395 case MTIOCTOP:
1396 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1397 return -EFAULT;
1398 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1399 case MTIOCGET:
1400 memset(&mtget, 0, sizeof(struct mtget));
1401 mtget.mt_type = MT_ISSCSI2;
1402 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1403 mtget.mt_dsreg =
1404 ((tape->blk_size * tape->user_bs_factor)
1405 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1406
1407 if (tape->drv_write_prot)
1408 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1409
1410 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1411 return -EFAULT;
1412 return 0;
1413 case MTIOCPOS:
1414 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1415 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1416 return -EFAULT;
1417 return 0;
1418 default:
1419 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1420 ide_tape_discard_merge_buffer(drive, 1);
1421 return idetape_blkdev_ioctl(drive, cmd, arg);
1422 }
1423}
1424
1425static long idetape_chrdev_ioctl(struct file *file,
1426 unsigned int cmd, unsigned long arg)
1427{
1428 long ret;
1429 mutex_lock(&ide_tape_mutex);
1430 ret = do_idetape_chrdev_ioctl(file, cmd, arg);
1431 mutex_unlock(&ide_tape_mutex);
1432 return ret;
1433}
1434
1435/*
1436 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1437 * block size with the reported value.
1438 */
1439static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1440{
1441 idetape_tape_t *tape = drive->driver_data;
1442 struct ide_atapi_pc pc;
1443 u8 buf[12];
1444
1445 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1446 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1447 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1448 if (tape->blk_size == 0) {
1449 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1450 "block size, assuming 32k\n");
1451 tape->blk_size = 32768;
1452 }
1453 return;
1454 }
1455 tape->blk_size = (buf[4 + 5] << 16) +
1456 (buf[4 + 6] << 8) +
1457 buf[4 + 7];
1458 tape->drv_write_prot = (buf[2] & 0x80) >> 7;
1459
1460 ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d",
1461 tape->blk_size, tape->drv_write_prot);
1462}
1463
1464static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1465{
1466 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1467 ide_drive_t *drive;
1468 idetape_tape_t *tape;
1469 int retval;
1470
1471 if (i >= MAX_HWIFS * MAX_DRIVES)
1472 return -ENXIO;
1473
1474 mutex_lock(&idetape_chrdev_mutex);
1475
1476 tape = ide_tape_get(NULL, true, i);
1477 if (!tape) {
1478 mutex_unlock(&idetape_chrdev_mutex);
1479 return -ENXIO;
1480 }
1481
1482 drive = tape->drive;
1483 filp->private_data = tape;
1484
1485 ide_debug_log(IDE_DBG_FUNC, "enter");
1486
1487 /*
1488 * We really want to do nonseekable_open(inode, filp); here, but some
1489 * versions of tar incorrectly call lseek on tapes and bail out if that
1490 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1491 */
1492 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1493
1494
1495 if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) {
1496 retval = -EBUSY;
1497 goto out_put_tape;
1498 }
1499
1500 retval = idetape_wait_ready(drive, 60 * HZ);
1501 if (retval) {
1502 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1503 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1504 goto out_put_tape;
1505 }
1506
1507 ide_tape_read_position(drive);
1508 if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags))
1509 (void)idetape_rewind_tape(drive);
1510
1511 /* Read block size and write protect status from drive. */
1512 ide_tape_get_bsize_from_bdesc(drive);
1513
1514 /* Set write protect flag if device is opened as read-only. */
1515 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1516 tape->write_prot = 1;
1517 else
1518 tape->write_prot = tape->drv_write_prot;
1519
1520 /* Make sure drive isn't write protected if user wants to write. */
1521 if (tape->write_prot) {
1522 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1523 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1524 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1525 retval = -EROFS;
1526 goto out_put_tape;
1527 }
1528 }
1529
1530 /* Lock the tape drive door so user can't eject. */
1531 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1532 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1533 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1534 tape->door_locked = DOOR_LOCKED;
1535 }
1536 }
1537 mutex_unlock(&idetape_chrdev_mutex);
1538
1539 return 0;
1540
1541out_put_tape:
1542 ide_tape_put(tape);
1543
1544 mutex_unlock(&idetape_chrdev_mutex);
1545
1546 return retval;
1547}
1548
1549static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1550{
1551 idetape_tape_t *tape = drive->driver_data;
1552
1553 ide_tape_flush_merge_buffer(drive);
1554 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1555 if (tape->buf != NULL) {
1556 idetape_pad_zeros(drive, tape->blk_size *
1557 (tape->user_bs_factor - 1));
1558 kfree(tape->buf);
1559 tape->buf = NULL;
1560 }
1561 idetape_write_filemark(drive);
1562 idetape_flush_tape_buffers(drive);
1563 idetape_flush_tape_buffers(drive);
1564}
1565
1566static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1567{
1568 struct ide_tape_obj *tape = filp->private_data;
1569 ide_drive_t *drive = tape->drive;
1570 unsigned int minor = iminor(inode);
1571
1572 mutex_lock(&idetape_chrdev_mutex);
1573
1574 tape = drive->driver_data;
1575
1576 ide_debug_log(IDE_DBG_FUNC, "enter");
1577
1578 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1579 idetape_write_release(drive, minor);
1580 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1581 if (minor < 128)
1582 ide_tape_discard_merge_buffer(drive, 1);
1583 }
1584
1585 if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1586 &drive->atapi_flags))
1587 (void) idetape_rewind_tape(drive);
1588
1589 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1590 if (tape->door_locked == DOOR_LOCKED) {
1591 if (!ide_set_media_lock(drive, tape->disk, 0))
1592 tape->door_locked = DOOR_UNLOCKED;
1593 }
1594 }
1595 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1596 ide_tape_put(tape);
1597
1598 mutex_unlock(&idetape_chrdev_mutex);
1599
1600 return 0;
1601}
1602
1603static void idetape_get_inquiry_results(ide_drive_t *drive)
1604{
1605 idetape_tape_t *tape = drive->driver_data;
1606 struct ide_atapi_pc pc;
1607 u8 pc_buf[256];
1608 char fw_rev[4], vendor_id[8], product_id[16];
1609
1610 idetape_create_inquiry_cmd(&pc);
1611 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
1612 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
1613 tape->name);
1614 return;
1615 }
1616 memcpy(vendor_id, &pc_buf[8], 8);
1617 memcpy(product_id, &pc_buf[16], 16);
1618 memcpy(fw_rev, &pc_buf[32], 4);
1619
1620 ide_fixstring(vendor_id, 8, 0);
1621 ide_fixstring(product_id, 16, 0);
1622 ide_fixstring(fw_rev, 4, 0);
1623
1624 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1625 drive->name, tape->name, vendor_id, product_id, fw_rev);
1626}
1627
1628/*
1629 * Ask the tape about its various parameters. In particular, we will adjust our
1630 * data transfer buffer size to the recommended value as returned by the tape.
1631 */
1632static void idetape_get_mode_sense_results(ide_drive_t *drive)
1633{
1634 idetape_tape_t *tape = drive->driver_data;
1635 struct ide_atapi_pc pc;
1636 u8 buf[24], *caps;
1637 u8 speed, max_speed;
1638
1639 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
1640 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1641 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
1642 " some default values\n");
1643 tape->blk_size = 512;
1644 put_unaligned(52, (u16 *)&tape->caps[12]);
1645 put_unaligned(540, (u16 *)&tape->caps[14]);
1646 put_unaligned(6*52, (u16 *)&tape->caps[16]);
1647 return;
1648 }
1649 caps = buf + 4 + buf[3];
1650
1651 /* convert to host order and save for later use */
1652 speed = be16_to_cpup((__be16 *)&caps[14]);
1653 max_speed = be16_to_cpup((__be16 *)&caps[8]);
1654
1655 *(u16 *)&caps[8] = max_speed;
1656 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
1657 *(u16 *)&caps[14] = speed;
1658 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
1659
1660 if (!speed) {
1661 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
1662 "(assuming 650KB/sec)\n", drive->name);
1663 *(u16 *)&caps[14] = 650;
1664 }
1665 if (!max_speed) {
1666 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
1667 "(assuming 650KB/sec)\n", drive->name);
1668 *(u16 *)&caps[8] = 650;
1669 }
1670
1671 memcpy(&tape->caps, caps, 20);
1672
1673 /* device lacks locking support according to capabilities page */
1674 if ((caps[6] & 1) == 0)
1675 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1676
1677 if (caps[7] & 0x02)
1678 tape->blk_size = 512;
1679 else if (caps[7] & 0x04)
1680 tape->blk_size = 1024;
1681}
1682
1683#ifdef CONFIG_IDE_PROC_FS
1684#define ide_tape_devset_get(name, field) \
1685static int get_##name(ide_drive_t *drive) \
1686{ \
1687 idetape_tape_t *tape = drive->driver_data; \
1688 return tape->field; \
1689}
1690
1691#define ide_tape_devset_set(name, field) \
1692static int set_##name(ide_drive_t *drive, int arg) \
1693{ \
1694 idetape_tape_t *tape = drive->driver_data; \
1695 tape->field = arg; \
1696 return 0; \
1697}
1698
1699#define ide_tape_devset_rw_field(_name, _field) \
1700ide_tape_devset_get(_name, _field) \
1701ide_tape_devset_set(_name, _field) \
1702IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1703
1704#define ide_tape_devset_r_field(_name, _field) \
1705ide_tape_devset_get(_name, _field) \
1706IDE_DEVSET(_name, 0, get_##_name, NULL)
1707
1708static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
1709static int divf_tdsc(ide_drive_t *drive) { return HZ; }
1710static int divf_buffer(ide_drive_t *drive) { return 2; }
1711static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
1712
1713ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1714
1715ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
1716
1717ide_tape_devset_r_field(avg_speed, avg_speed);
1718ide_tape_devset_r_field(speed, caps[14]);
1719ide_tape_devset_r_field(buffer, caps[16]);
1720ide_tape_devset_r_field(buffer_size, buffer_size);
1721
1722static const struct ide_proc_devset idetape_settings[] = {
1723 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
1724 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
1725 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
1726 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
1727 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
1728 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
1729 mulf_tdsc, divf_tdsc),
1730 { NULL },
1731};
1732#endif
1733
1734/*
1735 * The function below is called to:
1736 *
1737 * 1. Initialize our various state variables.
1738 * 2. Ask the tape for its capabilities.
1739 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1740 * is chosen based on the recommendation which we received in step 2.
1741 *
1742 * Note that at this point ide.c already assigned us an irq, so that we can
1743 * queue requests here and wait for their completion.
1744 */
1745static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1746{
1747 unsigned long t;
1748 int speed;
1749 u16 *ctl = (u16 *)&tape->caps[12];
1750
1751 ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor);
1752
1753 drive->pc_callback = ide_tape_callback;
1754
1755 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1756
1757 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1758 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1759 tape->name);
1760 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1761 }
1762
1763 /* Seagate Travan drives do not support DSC overlap. */
1764 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1765 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1766
1767 tape->minor = minor;
1768 tape->name[0] = 'h';
1769 tape->name[1] = 't';
1770 tape->name[2] = '0' + minor;
1771 tape->chrdev_dir = IDETAPE_DIR_NONE;
1772
1773 idetape_get_inquiry_results(drive);
1774 idetape_get_mode_sense_results(drive);
1775 ide_tape_get_bsize_from_bdesc(drive);
1776 tape->user_bs_factor = 1;
1777 tape->buffer_size = *ctl * tape->blk_size;
1778 while (tape->buffer_size > 0xffff) {
1779 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1780 *ctl /= 2;
1781 tape->buffer_size = *ctl * tape->blk_size;
1782 }
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 ide_proc_entry_t idetape_proc[] = {
1849 { "capacity", S_IFREG|S_IRUGO, ide_capacity_proc_show },
1850 { "name", S_IFREG|S_IRUGO, idetape_name_proc_show },
1851 {}
1852};
1853
1854static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
1855{
1856 return idetape_proc;
1857}
1858
1859static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
1860{
1861 return idetape_settings;
1862}
1863#endif
1864
1865static int ide_tape_probe(ide_drive_t *);
1866
1867static struct ide_driver idetape_driver = {
1868 .gen_driver = {
1869 .owner = THIS_MODULE,
1870 .name = "ide-tape",
1871 .bus = &ide_bus_type,
1872 },
1873 .probe = ide_tape_probe,
1874 .remove = ide_tape_remove,
1875 .version = IDETAPE_VERSION,
1876 .do_request = idetape_do_request,
1877#ifdef CONFIG_IDE_PROC_FS
1878 .proc_entries = ide_tape_proc_entries,
1879 .proc_devsets = ide_tape_proc_devsets,
1880#endif
1881};
1882
1883/* Our character device supporting functions, passed to register_chrdev. */
1884static const struct file_operations idetape_fops = {
1885 .owner = THIS_MODULE,
1886 .read = idetape_chrdev_read,
1887 .write = idetape_chrdev_write,
1888 .unlocked_ioctl = idetape_chrdev_ioctl,
1889 .open = idetape_chrdev_open,
1890 .release = idetape_chrdev_release,
1891 .llseek = noop_llseek,
1892};
1893
1894static int idetape_open(struct block_device *bdev, fmode_t mode)
1895{
1896 struct ide_tape_obj *tape;
1897
1898 mutex_lock(&ide_tape_mutex);
1899 tape = ide_tape_get(bdev->bd_disk, false, 0);
1900 mutex_unlock(&ide_tape_mutex);
1901
1902 if (!tape)
1903 return -ENXIO;
1904
1905 return 0;
1906}
1907
1908static void idetape_release(struct gendisk *disk, fmode_t mode)
1909{
1910 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1911
1912 mutex_lock(&ide_tape_mutex);
1913 ide_tape_put(tape);
1914 mutex_unlock(&ide_tape_mutex);
1915}
1916
1917static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1918 unsigned int cmd, unsigned long arg)
1919{
1920 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1921 ide_drive_t *drive = tape->drive;
1922 int err;
1923
1924 mutex_lock(&ide_tape_mutex);
1925 err = generic_ide_ioctl(drive, bdev, cmd, arg);
1926 if (err == -EINVAL)
1927 err = idetape_blkdev_ioctl(drive, cmd, arg);
1928 mutex_unlock(&ide_tape_mutex);
1929
1930 return err;
1931}
1932
1933static const struct block_device_operations idetape_block_ops = {
1934 .owner = THIS_MODULE,
1935 .open = idetape_open,
1936 .release = idetape_release,
1937 .ioctl = idetape_ioctl,
1938};
1939
1940static int ide_tape_probe(ide_drive_t *drive)
1941{
1942 idetape_tape_t *tape;
1943 struct gendisk *g;
1944 int minor;
1945
1946 ide_debug_log(IDE_DBG_FUNC, "enter");
1947
1948 if (!strstr(DRV_NAME, drive->driver_req))
1949 goto failed;
1950
1951 if (drive->media != ide_tape)
1952 goto failed;
1953
1954 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1955 ide_check_atapi_device(drive, DRV_NAME) == 0) {
1956 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1957 " the driver\n", drive->name);
1958 goto failed;
1959 }
1960 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1961 if (tape == NULL) {
1962 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1963 drive->name);
1964 goto failed;
1965 }
1966
1967 g = alloc_disk(1 << PARTN_BITS);
1968 if (!g)
1969 goto out_free_tape;
1970
1971 ide_init_disk(g, drive);
1972
1973 tape->dev.parent = &drive->gendev;
1974 tape->dev.release = ide_tape_release;
1975 dev_set_name(&tape->dev, "%s", dev_name(&drive->gendev));
1976
1977 if (device_register(&tape->dev))
1978 goto out_free_disk;
1979
1980 tape->drive = drive;
1981 tape->driver = &idetape_driver;
1982 tape->disk = g;
1983
1984 g->private_data = &tape->driver;
1985
1986 drive->driver_data = tape;
1987
1988 mutex_lock(&idetape_ref_mutex);
1989 for (minor = 0; idetape_devs[minor]; minor++)
1990 ;
1991 idetape_devs[minor] = tape;
1992 mutex_unlock(&idetape_ref_mutex);
1993
1994 idetape_setup(drive, tape, minor);
1995
1996 device_create(idetape_sysfs_class, &drive->gendev,
1997 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
1998 device_create(idetape_sysfs_class, &drive->gendev,
1999 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2000 "n%s", tape->name);
2001
2002 g->fops = &idetape_block_ops;
2003 ide_register_region(g);
2004
2005 return 0;
2006
2007out_free_disk:
2008 put_disk(g);
2009out_free_tape:
2010 kfree(tape);
2011failed:
2012 return -ENODEV;
2013}
2014
2015static void __exit idetape_exit(void)
2016{
2017 driver_unregister(&idetape_driver.gen_driver);
2018 class_destroy(idetape_sysfs_class);
2019 unregister_chrdev(IDETAPE_MAJOR, "ht");
2020}
2021
2022static int __init idetape_init(void)
2023{
2024 int error = 1;
2025 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2026 if (IS_ERR(idetape_sysfs_class)) {
2027 idetape_sysfs_class = NULL;
2028 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2029 error = -EBUSY;
2030 goto out;
2031 }
2032
2033 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2034 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2035 " interface\n");
2036 error = -EBUSY;
2037 goto out_free_class;
2038 }
2039
2040 error = driver_register(&idetape_driver.gen_driver);
2041 if (error)
2042 goto out_free_chrdev;
2043
2044 return 0;
2045
2046out_free_chrdev:
2047 unregister_chrdev(IDETAPE_MAJOR, "ht");
2048out_free_class:
2049 class_destroy(idetape_sysfs_class);
2050out:
2051 return error;
2052}
2053
2054MODULE_ALIAS("ide:*m-tape*");
2055module_init(idetape_init);
2056module_exit(idetape_exit);
2057MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2058MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2059MODULE_LICENSE("GPL");