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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/compat.h>
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/string.h>
26#include <linux/kernel.h>
27#include <linux/delay.h>
28#include <linux/timer.h>
29#include <linux/mm.h>
30#include <linux/interrupt.h>
31#include <linux/jiffies.h>
32#include <linux/major.h>
33#include <linux/errno.h>
34#include <linux/genhd.h>
35#include <linux/seq_file.h>
36#include <linux/slab.h>
37#include <linux/pci.h>
38#include <linux/ide.h>
39#include <linux/completion.h>
40#include <linux/bitops.h>
41#include <linux/mutex.h>
42#include <scsi/scsi.h>
43
44#include <asm/byteorder.h>
45#include <linux/uaccess.h>
46#include <linux/io.h>
47#include <asm/unaligned.h>
48#include <linux/mtio.h>
49
50/* define to see debug info */
51#undef IDETAPE_DEBUG_LOG
52
53#ifdef IDETAPE_DEBUG_LOG
54#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args)
55#else
56#define ide_debug_log(lvl, fmt, args...) do {} while (0)
57#endif
58
59/**************************** Tunable parameters *****************************/
60/*
61 * After each failed packet command we issue a request sense command and retry
62 * the packet command IDETAPE_MAX_PC_RETRIES times.
63 *
64 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
65 */
66#define IDETAPE_MAX_PC_RETRIES 3
67
68/*
69 * The following parameter is used to select the point in the internal tape fifo
70 * in which we will start to refill the buffer. Decreasing the following
71 * parameter will improve the system's latency and interactive response, while
72 * using a high value might improve system throughput.
73 */
74#define IDETAPE_FIFO_THRESHOLD 2
75
76/*
77 * DSC polling parameters.
78 *
79 * Polling for DSC (a single bit in the status register) is a very important
80 * function in ide-tape. There are two cases in which we poll for DSC:
81 *
82 * 1. Before a read/write packet command, to ensure that we can transfer data
83 * from/to the tape's data buffers, without causing an actual media access.
84 * In case the tape is not ready yet, we take out our request from the device
85 * request queue, so that ide.c could service requests from the other device
86 * on the same interface in the meantime.
87 *
88 * 2. After the successful initialization of a "media access packet command",
89 * which is a command that can take a long time to complete (the interval can
90 * range from several seconds to even an hour). Again, we postpone our request
91 * in the middle to free the bus for the other device. The polling frequency
92 * here should be lower than the read/write frequency since those media access
93 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
94 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
95 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
96 *
97 * We also set a timeout for the timer, in case something goes wrong. The
98 * timeout should be longer then the maximum execution time of a tape operation.
99 */
100
101/* DSC timings. */
102#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
103#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
104#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
105#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
106#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
107#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
108#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
109
110/*************************** End of tunable parameters ***********************/
111
112/* tape directions */
113enum {
114 IDETAPE_DIR_NONE = (1 << 0),
115 IDETAPE_DIR_READ = (1 << 1),
116 IDETAPE_DIR_WRITE = (1 << 2),
117};
118
119/* Tape door status */
120#define DOOR_UNLOCKED 0
121#define DOOR_LOCKED 1
122#define DOOR_EXPLICITLY_LOCKED 2
123
124/* Some defines for the SPACE command */
125#define IDETAPE_SPACE_OVER_FILEMARK 1
126#define IDETAPE_SPACE_TO_EOD 3
127
128/* Some defines for the LOAD UNLOAD command */
129#define IDETAPE_LU_LOAD_MASK 1
130#define IDETAPE_LU_RETENSION_MASK 2
131#define IDETAPE_LU_EOT_MASK 4
132
133/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
134#define IDETAPE_BLOCK_DESCRIPTOR 0
135#define IDETAPE_CAPABILITIES_PAGE 0x2a
136
137/*
138 * Most of our global data which we need to save even as we leave the driver due
139 * to an interrupt or a timer event is stored in the struct defined below.
140 */
141typedef struct ide_tape_obj {
142 ide_drive_t *drive;
143 struct ide_driver *driver;
144 struct gendisk *disk;
145 struct device dev;
146
147 /* used by REQ_IDETAPE_{READ,WRITE} requests */
148 struct ide_atapi_pc queued_pc;
149
150 /*
151 * DSC polling variables.
152 *
153 * While polling for DSC we use postponed_rq to postpone the current
154 * request so that ide.c will be able to service pending requests on the
155 * other device. Note that at most we will have only one DSC (usually
156 * data transfer) request in the device request queue.
157 */
158 bool postponed_rq;
159
160 /* The time in which we started polling for DSC */
161 unsigned long dsc_polling_start;
162 /* Timer used to poll for dsc */
163 struct timer_list dsc_timer;
164 /* Read/Write dsc polling frequency */
165 unsigned long best_dsc_rw_freq;
166 unsigned long dsc_poll_freq;
167 unsigned long dsc_timeout;
168
169 /* Read position information */
170 u8 partition;
171 /* Current block */
172 unsigned int first_frame;
173
174 /* Last error information */
175 u8 sense_key, asc, ascq;
176
177 /* Character device operation */
178 unsigned int minor;
179 /* device name */
180 char name[4];
181 /* Current character device data transfer direction */
182 u8 chrdev_dir;
183
184 /* tape block size, usually 512 or 1024 bytes */
185 unsigned short blk_size;
186 int user_bs_factor;
187
188 /* Copy of the tape's Capabilities and Mechanical Page */
189 u8 caps[20];
190
191 /*
192 * Active data transfer request parameters.
193 *
194 * At most, there is only one ide-tape originated data transfer request
195 * in the device request queue. This allows ide.c to easily service
196 * requests from the other device when we postpone our active request.
197 */
198
199 /* Data buffer size chosen based on the tape's recommendation */
200 int buffer_size;
201 /* Staging buffer of buffer_size bytes */
202 void *buf;
203 /* The read/write cursor */
204 void *cur;
205 /* The number of valid bytes in buf */
206 size_t valid;
207
208 /* Measures average tape speed */
209 unsigned long avg_time;
210 int avg_size;
211 int avg_speed;
212
213 /* the door is currently locked */
214 int door_locked;
215 /* the tape hardware is write protected */
216 char drv_write_prot;
217 /* the tape is write protected (hardware or opened as read-only) */
218 char write_prot;
219} idetape_tape_t;
220
221static DEFINE_MUTEX(ide_tape_mutex);
222static DEFINE_MUTEX(idetape_ref_mutex);
223
224static DEFINE_MUTEX(idetape_chrdev_mutex);
225
226static struct class *idetape_sysfs_class;
227
228static void ide_tape_release(struct device *);
229
230static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
231
232static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev,
233 unsigned int i)
234{
235 struct ide_tape_obj *tape = NULL;
236
237 mutex_lock(&idetape_ref_mutex);
238
239 if (cdev)
240 tape = idetape_devs[i];
241 else
242 tape = ide_drv_g(disk, ide_tape_obj);
243
244 if (tape) {
245 if (ide_device_get(tape->drive))
246 tape = NULL;
247 else
248 get_device(&tape->dev);
249 }
250
251 mutex_unlock(&idetape_ref_mutex);
252 return tape;
253}
254
255static void ide_tape_put(struct ide_tape_obj *tape)
256{
257 ide_drive_t *drive = tape->drive;
258
259 mutex_lock(&idetape_ref_mutex);
260 put_device(&tape->dev);
261 ide_device_put(drive);
262 mutex_unlock(&idetape_ref_mutex);
263}
264
265/*
266 * called on each failed packet command retry to analyze the request sense. We
267 * currently do not utilize this information.
268 */
269static void idetape_analyze_error(ide_drive_t *drive)
270{
271 idetape_tape_t *tape = drive->driver_data;
272 struct ide_atapi_pc *pc = drive->failed_pc;
273 struct request *rq = drive->hwif->rq;
274 u8 *sense = bio_data(rq->bio);
275
276 tape->sense_key = sense[2] & 0xF;
277 tape->asc = sense[12];
278 tape->ascq = sense[13];
279
280 ide_debug_log(IDE_DBG_FUNC,
281 "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x",
282 rq->cmd[0], tape->sense_key, tape->asc, tape->ascq);
283
284 /* correct remaining bytes to transfer */
285 if (pc->flags & PC_FLAG_DMA_ERROR)
286 scsi_req(rq)->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
287
288 /*
289 * If error was the result of a zero-length read or write command,
290 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
291 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
292 */
293 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
294 /* length == 0 */
295 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
296 if (tape->sense_key == 5) {
297 /* don't report an error, everything's ok */
298 pc->error = 0;
299 /* don't retry read/write */
300 pc->flags |= PC_FLAG_ABORT;
301 }
302 }
303 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
304 pc->error = IDE_DRV_ERROR_FILEMARK;
305 pc->flags |= PC_FLAG_ABORT;
306 }
307 if (pc->c[0] == WRITE_6) {
308 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
309 && tape->asc == 0x0 && tape->ascq == 0x2)) {
310 pc->error = IDE_DRV_ERROR_EOD;
311 pc->flags |= PC_FLAG_ABORT;
312 }
313 }
314 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
315 if (tape->sense_key == 8) {
316 pc->error = IDE_DRV_ERROR_EOD;
317 pc->flags |= PC_FLAG_ABORT;
318 }
319 if (!(pc->flags & PC_FLAG_ABORT) &&
320 (blk_rq_bytes(rq) - scsi_req(rq)->resid_len))
321 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
322 }
323}
324
325static void ide_tape_handle_dsc(ide_drive_t *);
326
327static int ide_tape_callback(ide_drive_t *drive, int dsc)
328{
329 idetape_tape_t *tape = drive->driver_data;
330 struct ide_atapi_pc *pc = drive->pc;
331 struct request *rq = drive->hwif->rq;
332 int uptodate = pc->error ? 0 : 1;
333 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
334
335 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0],
336 dsc, err);
337
338 if (dsc)
339 ide_tape_handle_dsc(drive);
340
341 if (drive->failed_pc == pc)
342 drive->failed_pc = NULL;
343
344 if (pc->c[0] == REQUEST_SENSE) {
345 if (uptodate)
346 idetape_analyze_error(drive);
347 else
348 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
349 "itself - Aborting request!\n");
350 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
351 unsigned int blocks =
352 (blk_rq_bytes(rq) - scsi_req(rq)->resid_len) / tape->blk_size;
353
354 tape->avg_size += blocks * tape->blk_size;
355
356 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
357 tape->avg_speed = tape->avg_size * HZ /
358 (jiffies - tape->avg_time) / 1024;
359 tape->avg_size = 0;
360 tape->avg_time = jiffies;
361 }
362
363 tape->first_frame += blocks;
364
365 if (pc->error) {
366 uptodate = 0;
367 err = pc->error;
368 }
369 }
370 scsi_req(rq)->result = err;
371
372 return uptodate;
373}
374
375/*
376 * Postpone the current request so that ide.c will be able to service requests
377 * from another device on the same port while we are polling for DSC.
378 */
379static void ide_tape_stall_queue(ide_drive_t *drive)
380{
381 idetape_tape_t *tape = drive->driver_data;
382
383 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu",
384 drive->hwif->rq->cmd[0], tape->dsc_poll_freq);
385
386 tape->postponed_rq = true;
387
388 ide_stall_queue(drive, tape->dsc_poll_freq);
389}
390
391static void ide_tape_handle_dsc(ide_drive_t *drive)
392{
393 idetape_tape_t *tape = drive->driver_data;
394
395 /* Media access command */
396 tape->dsc_polling_start = jiffies;
397 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
398 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
399 /* Allow ide.c to handle other requests */
400 ide_tape_stall_queue(drive);
401}
402
403/*
404 * Packet Command Interface
405 *
406 * The current Packet Command is available in drive->pc, and will not change
407 * until we finish handling it. Each packet command is associated with a
408 * callback function that will be called when the command is finished.
409 *
410 * The handling will be done in three stages:
411 *
412 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
413 * the interrupt handler to ide_pc_intr.
414 *
415 * 2. On each interrupt, ide_pc_intr will be called. This step will be
416 * repeated until the device signals us that no more interrupts will be issued.
417 *
418 * 3. ATAPI Tape media access commands have immediate status with a delayed
419 * process. In case of a successful initiation of a media access packet command,
420 * the DSC bit will be set when the actual execution of the command is finished.
421 * Since the tape drive will not issue an interrupt, we have to poll for this
422 * event. In this case, we define the request as "low priority request" by
423 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
424 * exit the driver.
425 *
426 * ide.c will then give higher priority to requests which originate from the
427 * other device, until will change rq_status to RQ_ACTIVE.
428 *
429 * 4. When the packet command is finished, it will be checked for errors.
430 *
431 * 5. In case an error was found, we queue a request sense packet command in
432 * front of the request queue and retry the operation up to
433 * IDETAPE_MAX_PC_RETRIES times.
434 *
435 * 6. In case no error was found, or we decided to give up and not to retry
436 * again, the callback function will be called and then we will handle the next
437 * request.
438 */
439
440static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
441 struct ide_cmd *cmd,
442 struct ide_atapi_pc *pc)
443{
444 idetape_tape_t *tape = drive->driver_data;
445 struct request *rq = drive->hwif->rq;
446
447 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
448 drive->failed_pc = pc;
449
450 /* Set the current packet command */
451 drive->pc = pc;
452
453 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
454 (pc->flags & PC_FLAG_ABORT)) {
455
456 /*
457 * We will "abort" retrying a packet command in case legitimate
458 * error code was received (crossing a filemark, or end of the
459 * media, for example).
460 */
461 if (!(pc->flags & PC_FLAG_ABORT)) {
462 if (!(pc->c[0] == TEST_UNIT_READY &&
463 tape->sense_key == 2 && tape->asc == 4 &&
464 (tape->ascq == 1 || tape->ascq == 8))) {
465 printk(KERN_ERR "ide-tape: %s: I/O error, "
466 "pc = %2x, key = %2x, "
467 "asc = %2x, ascq = %2x\n",
468 tape->name, pc->c[0],
469 tape->sense_key, tape->asc,
470 tape->ascq);
471 }
472 /* Giving up */
473 pc->error = IDE_DRV_ERROR_GENERAL;
474 }
475
476 drive->failed_pc = NULL;
477 drive->pc_callback(drive, 0);
478 ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq));
479 return ide_stopped;
480 }
481 ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries,
482 pc->c[0]);
483
484 pc->retries++;
485
486 return ide_issue_pc(drive, cmd);
487}
488
489/* A mode sense command is used to "sense" tape parameters. */
490static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
491{
492 ide_init_pc(pc);
493 pc->c[0] = MODE_SENSE;
494 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
495 /* DBD = 1 - Don't return block descriptors */
496 pc->c[1] = 8;
497 pc->c[2] = page_code;
498 /*
499 * Changed pc->c[3] to 0 (255 will at best return unused info).
500 *
501 * For SCSI this byte is defined as subpage instead of high byte
502 * of length and some IDE drives seem to interpret it this way
503 * and return an error when 255 is used.
504 */
505 pc->c[3] = 0;
506 /* We will just discard data in that case */
507 pc->c[4] = 255;
508 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
509 pc->req_xfer = 12;
510 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
511 pc->req_xfer = 24;
512 else
513 pc->req_xfer = 50;
514}
515
516static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
517{
518 ide_hwif_t *hwif = drive->hwif;
519 idetape_tape_t *tape = drive->driver_data;
520 struct ide_atapi_pc *pc = drive->pc;
521 u8 stat;
522
523 stat = hwif->tp_ops->read_status(hwif);
524
525 if (stat & ATA_DSC) {
526 if (stat & ATA_ERR) {
527 /* Error detected */
528 if (pc->c[0] != TEST_UNIT_READY)
529 printk(KERN_ERR "ide-tape: %s: I/O error, ",
530 tape->name);
531 /* Retry operation */
532 ide_retry_pc(drive);
533 return ide_stopped;
534 }
535 pc->error = 0;
536 } else {
537 pc->error = IDE_DRV_ERROR_GENERAL;
538 drive->failed_pc = NULL;
539 }
540 drive->pc_callback(drive, 0);
541 return ide_stopped;
542}
543
544static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
545 struct ide_atapi_pc *pc, struct request *rq,
546 u8 opcode)
547{
548 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
549
550 ide_init_pc(pc);
551 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
552 pc->c[1] = 1;
553
554 if (blk_rq_bytes(rq) == tape->buffer_size)
555 pc->flags |= PC_FLAG_DMA_OK;
556
557 if (opcode == READ_6)
558 pc->c[0] = READ_6;
559 else if (opcode == WRITE_6) {
560 pc->c[0] = WRITE_6;
561 pc->flags |= PC_FLAG_WRITING;
562 }
563
564 memcpy(scsi_req(rq)->cmd, pc->c, 12);
565}
566
567static ide_startstop_t idetape_do_request(ide_drive_t *drive,
568 struct request *rq, sector_t block)
569{
570 ide_hwif_t *hwif = drive->hwif;
571 idetape_tape_t *tape = drive->driver_data;
572 struct ide_atapi_pc *pc = NULL;
573 struct ide_cmd cmd;
574 struct scsi_request *req = scsi_req(rq);
575 u8 stat;
576
577 ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
578 req->cmd[0], (unsigned long long)blk_rq_pos(rq),
579 blk_rq_sectors(rq));
580
581 BUG_ON(!blk_rq_is_private(rq));
582 BUG_ON(ide_req(rq)->type != ATA_PRIV_MISC &&
583 ide_req(rq)->type != ATA_PRIV_SENSE);
584
585 /* Retry a failed packet command */
586 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
587 pc = drive->failed_pc;
588 goto out;
589 }
590
591 /*
592 * If the tape is still busy, postpone our request and service
593 * the other device meanwhile.
594 */
595 stat = hwif->tp_ops->read_status(hwif);
596
597 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
598 (req->cmd[13] & REQ_IDETAPE_PC2) == 0)
599 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
600
601 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
602 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
603 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
604 }
605
606 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
607 !(stat & ATA_DSC)) {
608 if (!tape->postponed_rq) {
609 tape->dsc_polling_start = jiffies;
610 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
611 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
612 } else if (time_after(jiffies, tape->dsc_timeout)) {
613 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
614 tape->name);
615 if (req->cmd[13] & REQ_IDETAPE_PC2) {
616 idetape_media_access_finished(drive);
617 return ide_stopped;
618 } else {
619 return ide_do_reset(drive);
620 }
621 } else if (time_after(jiffies,
622 tape->dsc_polling_start +
623 IDETAPE_DSC_MA_THRESHOLD))
624 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
625 ide_tape_stall_queue(drive);
626 return ide_stopped;
627 } else {
628 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
629 tape->postponed_rq = false;
630 }
631
632 if (req->cmd[13] & REQ_IDETAPE_READ) {
633 pc = &tape->queued_pc;
634 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
635 goto out;
636 }
637 if (req->cmd[13] & REQ_IDETAPE_WRITE) {
638 pc = &tape->queued_pc;
639 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
640 goto out;
641 }
642 if (req->cmd[13] & REQ_IDETAPE_PC1) {
643 pc = (struct ide_atapi_pc *)ide_req(rq)->special;
644 req->cmd[13] &= ~(REQ_IDETAPE_PC1);
645 req->cmd[13] |= REQ_IDETAPE_PC2;
646 goto out;
647 }
648 if (req->cmd[13] & REQ_IDETAPE_PC2) {
649 idetape_media_access_finished(drive);
650 return ide_stopped;
651 }
652 BUG();
653
654out:
655 /* prepare sense request for this command */
656 ide_prep_sense(drive, rq);
657
658 memset(&cmd, 0, sizeof(cmd));
659
660 if (rq_data_dir(rq))
661 cmd.tf_flags |= IDE_TFLAG_WRITE;
662
663 cmd.rq = rq;
664
665 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
666 ide_map_sg(drive, &cmd);
667
668 return ide_tape_issue_pc(drive, &cmd, pc);
669}
670
671/*
672 * Write a filemark if write_filemark=1. Flush the device buffers without
673 * writing a filemark otherwise.
674 */
675static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
676 struct ide_atapi_pc *pc, int write_filemark)
677{
678 ide_init_pc(pc);
679 pc->c[0] = WRITE_FILEMARKS;
680 pc->c[4] = write_filemark;
681 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
682}
683
684static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
685{
686 idetape_tape_t *tape = drive->driver_data;
687 struct gendisk *disk = tape->disk;
688 int load_attempted = 0;
689
690 /* Wait for the tape to become ready */
691 set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags);
692 timeout += jiffies;
693 while (time_before(jiffies, timeout)) {
694 if (ide_do_test_unit_ready(drive, disk) == 0)
695 return 0;
696 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
697 || (tape->asc == 0x3A)) {
698 /* no media */
699 if (load_attempted)
700 return -ENOMEDIUM;
701 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
702 load_attempted = 1;
703 /* not about to be ready */
704 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
705 (tape->ascq == 1 || tape->ascq == 8)))
706 return -EIO;
707 msleep(100);
708 }
709 return -EIO;
710}
711
712static int idetape_flush_tape_buffers(ide_drive_t *drive)
713{
714 struct ide_tape_obj *tape = drive->driver_data;
715 struct ide_atapi_pc pc;
716 int rc;
717
718 idetape_create_write_filemark_cmd(drive, &pc, 0);
719 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
720 if (rc)
721 return rc;
722 idetape_wait_ready(drive, 60 * 5 * HZ);
723 return 0;
724}
725
726static int ide_tape_read_position(ide_drive_t *drive)
727{
728 idetape_tape_t *tape = drive->driver_data;
729 struct ide_atapi_pc pc;
730 u8 buf[20];
731
732 ide_debug_log(IDE_DBG_FUNC, "enter");
733
734 /* prep cmd */
735 ide_init_pc(&pc);
736 pc.c[0] = READ_POSITION;
737 pc.req_xfer = 20;
738
739 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
740 return -1;
741
742 if (!pc.error) {
743 ide_debug_log(IDE_DBG_FUNC, "BOP - %s",
744 (buf[0] & 0x80) ? "Yes" : "No");
745 ide_debug_log(IDE_DBG_FUNC, "EOP - %s",
746 (buf[0] & 0x40) ? "Yes" : "No");
747
748 if (buf[0] & 0x4) {
749 printk(KERN_INFO "ide-tape: Block location is unknown"
750 "to the tape\n");
751 clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
752 &drive->atapi_flags);
753 return -1;
754 } else {
755 ide_debug_log(IDE_DBG_FUNC, "Block Location: %u",
756 be32_to_cpup((__be32 *)&buf[4]));
757
758 tape->partition = buf[1];
759 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
760 set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID),
761 &drive->atapi_flags);
762 }
763 }
764
765 return tape->first_frame;
766}
767
768static void idetape_create_locate_cmd(ide_drive_t *drive,
769 struct ide_atapi_pc *pc,
770 unsigned int block, u8 partition, int skip)
771{
772 ide_init_pc(pc);
773 pc->c[0] = POSITION_TO_ELEMENT;
774 pc->c[1] = 2;
775 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
776 pc->c[8] = partition;
777 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
778}
779
780static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
781{
782 idetape_tape_t *tape = drive->driver_data;
783
784 if (tape->chrdev_dir != IDETAPE_DIR_READ)
785 return;
786
787 clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags);
788 tape->valid = 0;
789 if (tape->buf != NULL) {
790 kfree(tape->buf);
791 tape->buf = NULL;
792 }
793
794 tape->chrdev_dir = IDETAPE_DIR_NONE;
795}
796
797/*
798 * Position the tape to the requested block using the LOCATE packet command.
799 * A READ POSITION command is then issued to check where we are positioned. Like
800 * all higher level operations, we queue the commands at the tail of the request
801 * queue and wait for their completion.
802 */
803static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
804 u8 partition, int skip)
805{
806 idetape_tape_t *tape = drive->driver_data;
807 struct gendisk *disk = tape->disk;
808 int ret;
809 struct ide_atapi_pc pc;
810
811 if (tape->chrdev_dir == IDETAPE_DIR_READ)
812 __ide_tape_discard_merge_buffer(drive);
813 idetape_wait_ready(drive, 60 * 5 * HZ);
814 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
815 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
816 if (ret)
817 return ret;
818
819 ret = ide_tape_read_position(drive);
820 if (ret < 0)
821 return ret;
822 return 0;
823}
824
825static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
826 int restore_position)
827{
828 idetape_tape_t *tape = drive->driver_data;
829 int seek, position;
830
831 __ide_tape_discard_merge_buffer(drive);
832 if (restore_position) {
833 position = ide_tape_read_position(drive);
834 seek = position > 0 ? position : 0;
835 if (idetape_position_tape(drive, seek, 0, 0)) {
836 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
837 " %s\n", tape->name, __func__);
838 return;
839 }
840 }
841}
842
843/*
844 * Generate a read/write request for the block device interface and wait for it
845 * to be serviced.
846 */
847static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
848{
849 idetape_tape_t *tape = drive->driver_data;
850 struct request *rq;
851 int ret;
852
853 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size);
854
855 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
856 BUG_ON(size < 0 || size % tape->blk_size);
857
858 rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
859 ide_req(rq)->type = ATA_PRIV_MISC;
860 scsi_req(rq)->cmd[13] = cmd;
861 rq->rq_disk = tape->disk;
862 rq->__sector = tape->first_frame;
863
864 if (size) {
865 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
866 GFP_NOIO);
867 if (ret)
868 goto out_put;
869 }
870
871 blk_execute_rq(drive->queue, tape->disk, rq, 0);
872
873 /* calculate the number of transferred bytes and update buffer state */
874 size -= scsi_req(rq)->resid_len;
875 tape->cur = tape->buf;
876 if (cmd == REQ_IDETAPE_READ)
877 tape->valid = size;
878 else
879 tape->valid = 0;
880
881 ret = size;
882 if (scsi_req(rq)->result == IDE_DRV_ERROR_GENERAL)
883 ret = -EIO;
884out_put:
885 blk_put_request(rq);
886 return ret;
887}
888
889static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
890{
891 ide_init_pc(pc);
892 pc->c[0] = INQUIRY;
893 pc->c[4] = 254;
894 pc->req_xfer = 254;
895}
896
897static void idetape_create_rewind_cmd(ide_drive_t *drive,
898 struct ide_atapi_pc *pc)
899{
900 ide_init_pc(pc);
901 pc->c[0] = REZERO_UNIT;
902 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
903}
904
905static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
906{
907 ide_init_pc(pc);
908 pc->c[0] = ERASE;
909 pc->c[1] = 1;
910 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
911}
912
913static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
914{
915 ide_init_pc(pc);
916 pc->c[0] = SPACE;
917 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
918 pc->c[1] = cmd;
919 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
920}
921
922static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
923{
924 idetape_tape_t *tape = drive->driver_data;
925
926 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
927 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
928 " but we are not writing.\n");
929 return;
930 }
931 if (tape->buf) {
932 size_t aligned = roundup(tape->valid, tape->blk_size);
933
934 memset(tape->cur, 0, aligned - tape->valid);
935 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
936 kfree(tape->buf);
937 tape->buf = NULL;
938 }
939 tape->chrdev_dir = IDETAPE_DIR_NONE;
940}
941
942static int idetape_init_rw(ide_drive_t *drive, int dir)
943{
944 idetape_tape_t *tape = drive->driver_data;
945 int rc;
946
947 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
948
949 if (tape->chrdev_dir == dir)
950 return 0;
951
952 if (tape->chrdev_dir == IDETAPE_DIR_READ)
953 ide_tape_discard_merge_buffer(drive, 1);
954 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
955 ide_tape_flush_merge_buffer(drive);
956 idetape_flush_tape_buffers(drive);
957 }
958
959 if (tape->buf || tape->valid) {
960 printk(KERN_ERR "ide-tape: valid should be 0 now\n");
961 tape->valid = 0;
962 }
963
964 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
965 if (!tape->buf)
966 return -ENOMEM;
967 tape->chrdev_dir = dir;
968 tape->cur = tape->buf;
969
970 /*
971 * Issue a 0 rw command to ensure that DSC handshake is
972 * switched from completion mode to buffer available mode. No
973 * point in issuing this if DSC overlap isn't supported, some
974 * drives (Seagate STT3401A) will return an error.
975 */
976 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
977 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
978 : REQ_IDETAPE_WRITE;
979
980 rc = idetape_queue_rw_tail(drive, cmd, 0);
981 if (rc < 0) {
982 kfree(tape->buf);
983 tape->buf = NULL;
984 tape->chrdev_dir = IDETAPE_DIR_NONE;
985 return rc;
986 }
987 }
988
989 return 0;
990}
991
992static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
993{
994 idetape_tape_t *tape = drive->driver_data;
995
996 memset(tape->buf, 0, tape->buffer_size);
997
998 while (bcount) {
999 unsigned int count = min(tape->buffer_size, bcount);
1000
1001 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
1002 bcount -= count;
1003 }
1004}
1005
1006/*
1007 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1008 * currently support only one partition.
1009 */
1010static int idetape_rewind_tape(ide_drive_t *drive)
1011{
1012 struct ide_tape_obj *tape = drive->driver_data;
1013 struct gendisk *disk = tape->disk;
1014 struct ide_atapi_pc pc;
1015 int ret;
1016
1017 ide_debug_log(IDE_DBG_FUNC, "enter");
1018
1019 idetape_create_rewind_cmd(drive, &pc);
1020 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1021 if (ret)
1022 return ret;
1023
1024 ret = ide_tape_read_position(drive);
1025 if (ret < 0)
1026 return ret;
1027 return 0;
1028}
1029
1030/* mtio.h compatible commands should be issued to the chrdev interface. */
1031static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1032 unsigned long arg)
1033{
1034 idetape_tape_t *tape = drive->driver_data;
1035 void __user *argp = (void __user *)arg;
1036
1037 struct idetape_config {
1038 int dsc_rw_frequency;
1039 int dsc_media_access_frequency;
1040 int nr_stages;
1041 } config;
1042
1043 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd);
1044
1045 switch (cmd) {
1046 case 0x0340:
1047 if (copy_from_user(&config, argp, sizeof(config)))
1048 return -EFAULT;
1049 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1050 break;
1051 case 0x0350:
1052 memset(&config, 0, sizeof(config));
1053 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1054 config.nr_stages = 1;
1055 if (copy_to_user(argp, &config, sizeof(config)))
1056 return -EFAULT;
1057 break;
1058 default:
1059 return -EIO;
1060 }
1061 return 0;
1062}
1063
1064static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1065 int mt_count)
1066{
1067 idetape_tape_t *tape = drive->driver_data;
1068 struct gendisk *disk = tape->disk;
1069 struct ide_atapi_pc pc;
1070 int retval, count = 0;
1071 int sprev = !!(tape->caps[4] & 0x20);
1072
1073
1074 ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count);
1075
1076 if (mt_count == 0)
1077 return 0;
1078 if (MTBSF == mt_op || MTBSFM == mt_op) {
1079 if (!sprev)
1080 return -EIO;
1081 mt_count = -mt_count;
1082 }
1083
1084 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1085 tape->valid = 0;
1086 if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK),
1087 &drive->atapi_flags))
1088 ++count;
1089 ide_tape_discard_merge_buffer(drive, 0);
1090 }
1091
1092 switch (mt_op) {
1093 case MTFSF:
1094 case MTBSF:
1095 idetape_create_space_cmd(&pc, mt_count - count,
1096 IDETAPE_SPACE_OVER_FILEMARK);
1097 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1098 case MTFSFM:
1099 case MTBSFM:
1100 if (!sprev)
1101 return -EIO;
1102 retval = idetape_space_over_filemarks(drive, MTFSF,
1103 mt_count - count);
1104 if (retval)
1105 return retval;
1106 count = (MTBSFM == mt_op ? 1 : -1);
1107 return idetape_space_over_filemarks(drive, MTFSF, count);
1108 default:
1109 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1110 mt_op);
1111 return -EIO;
1112 }
1113}
1114
1115/*
1116 * Our character device read / write functions.
1117 *
1118 * The tape is optimized to maximize throughput when it is transferring an
1119 * integral number of the "continuous transfer limit", which is a parameter of
1120 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1121 *
1122 * As of version 1.3 of the driver, the character device provides an abstract
1123 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1124 * same backup/restore procedure is supported. The driver will internally
1125 * convert the requests to the recommended transfer unit, so that an unmatch
1126 * between the user's block size to the recommended size will only result in a
1127 * (slightly) increased driver overhead, but will no longer hit performance.
1128 * This is not applicable to Onstream.
1129 */
1130static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1131 size_t count, loff_t *ppos)
1132{
1133 struct ide_tape_obj *tape = file->private_data;
1134 ide_drive_t *drive = tape->drive;
1135 size_t done = 0;
1136 ssize_t ret = 0;
1137 int rc;
1138
1139 ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
1140
1141 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1142 if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags))
1143 if (count > tape->blk_size &&
1144 (count % tape->blk_size) == 0)
1145 tape->user_bs_factor = count / tape->blk_size;
1146 }
1147
1148 rc = idetape_init_rw(drive, IDETAPE_DIR_READ);
1149 if (rc < 0)
1150 return rc;
1151
1152 while (done < count) {
1153 size_t todo;
1154
1155 /* refill if staging buffer is empty */
1156 if (!tape->valid) {
1157 /* If we are at a filemark, nothing more to read */
1158 if (test_bit(ilog2(IDE_AFLAG_FILEMARK),
1159 &drive->atapi_flags))
1160 break;
1161 /* read */
1162 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
1163 tape->buffer_size) <= 0)
1164 break;
1165 }
1166
1167 /* copy out */
1168 todo = min_t(size_t, count - done, tape->valid);
1169 if (copy_to_user(buf + done, tape->cur, todo))
1170 ret = -EFAULT;
1171
1172 tape->cur += todo;
1173 tape->valid -= todo;
1174 done += todo;
1175 }
1176
1177 if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) {
1178 idetape_space_over_filemarks(drive, MTFSF, 1);
1179 return 0;
1180 }
1181
1182 return ret ? ret : done;
1183}
1184
1185static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1186 size_t count, loff_t *ppos)
1187{
1188 struct ide_tape_obj *tape = file->private_data;
1189 ide_drive_t *drive = tape->drive;
1190 size_t done = 0;
1191 ssize_t ret = 0;
1192 int rc;
1193
1194 /* The drive is write protected. */
1195 if (tape->write_prot)
1196 return -EACCES;
1197
1198 ide_debug_log(IDE_DBG_FUNC, "count %zd", count);
1199
1200 /* Initialize write operation */
1201 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
1202 if (rc < 0)
1203 return rc;
1204
1205 while (done < count) {
1206 size_t todo;
1207
1208 /* flush if staging buffer is full */
1209 if (tape->valid == tape->buffer_size &&
1210 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1211 tape->buffer_size) <= 0)
1212 return rc;
1213
1214 /* copy in */
1215 todo = min_t(size_t, count - done,
1216 tape->buffer_size - tape->valid);
1217 if (copy_from_user(tape->cur, buf + done, todo))
1218 ret = -EFAULT;
1219
1220 tape->cur += todo;
1221 tape->valid += todo;
1222 done += todo;
1223 }
1224
1225 return ret ? ret : done;
1226}
1227
1228static int idetape_write_filemark(ide_drive_t *drive)
1229{
1230 struct ide_tape_obj *tape = drive->driver_data;
1231 struct ide_atapi_pc pc;
1232
1233 /* Write a filemark */
1234 idetape_create_write_filemark_cmd(drive, &pc, 1);
1235 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
1236 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1237 return -EIO;
1238 }
1239 return 0;
1240}
1241
1242/*
1243 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1244 * requested.
1245 *
1246 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1247 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1248 * usually not supported.
1249 *
1250 * The following commands are currently not supported:
1251 *
1252 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1253 * MT_ST_WRITE_THRESHOLD.
1254 */
1255static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1256{
1257 idetape_tape_t *tape = drive->driver_data;
1258 struct gendisk *disk = tape->disk;
1259 struct ide_atapi_pc pc;
1260 int i, retval;
1261
1262 ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d",
1263 mt_op, mt_count);
1264
1265 switch (mt_op) {
1266 case MTFSF:
1267 case MTFSFM:
1268 case MTBSF:
1269 case MTBSFM:
1270 if (!mt_count)
1271 return 0;
1272 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1273 default:
1274 break;
1275 }
1276
1277 switch (mt_op) {
1278 case MTWEOF:
1279 if (tape->write_prot)
1280 return -EACCES;
1281 ide_tape_discard_merge_buffer(drive, 1);
1282 for (i = 0; i < mt_count; i++) {
1283 retval = idetape_write_filemark(drive);
1284 if (retval)
1285 return retval;
1286 }
1287 return 0;
1288 case MTREW:
1289 ide_tape_discard_merge_buffer(drive, 0);
1290 if (idetape_rewind_tape(drive))
1291 return -EIO;
1292 return 0;
1293 case MTLOAD:
1294 ide_tape_discard_merge_buffer(drive, 0);
1295 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1296 case MTUNLOAD:
1297 case MTOFFL:
1298 /*
1299 * If door is locked, attempt to unlock before
1300 * attempting to eject.
1301 */
1302 if (tape->door_locked) {
1303 if (!ide_set_media_lock(drive, disk, 0))
1304 tape->door_locked = DOOR_UNLOCKED;
1305 }
1306 ide_tape_discard_merge_buffer(drive, 0);
1307 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1308 if (!retval)
1309 clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1310 &drive->atapi_flags);
1311 return retval;
1312 case MTNOP:
1313 ide_tape_discard_merge_buffer(drive, 0);
1314 return idetape_flush_tape_buffers(drive);
1315 case MTRETEN:
1316 ide_tape_discard_merge_buffer(drive, 0);
1317 return ide_do_start_stop(drive, disk,
1318 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1319 case MTEOM:
1320 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1321 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1322 case MTERASE:
1323 (void)idetape_rewind_tape(drive);
1324 idetape_create_erase_cmd(&pc);
1325 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1326 case MTSETBLK:
1327 if (mt_count) {
1328 if (mt_count < tape->blk_size ||
1329 mt_count % tape->blk_size)
1330 return -EIO;
1331 tape->user_bs_factor = mt_count / tape->blk_size;
1332 clear_bit(ilog2(IDE_AFLAG_DETECT_BS),
1333 &drive->atapi_flags);
1334 } else
1335 set_bit(ilog2(IDE_AFLAG_DETECT_BS),
1336 &drive->atapi_flags);
1337 return 0;
1338 case MTSEEK:
1339 ide_tape_discard_merge_buffer(drive, 0);
1340 return idetape_position_tape(drive,
1341 mt_count * tape->user_bs_factor, tape->partition, 0);
1342 case MTSETPART:
1343 ide_tape_discard_merge_buffer(drive, 0);
1344 return idetape_position_tape(drive, 0, mt_count, 0);
1345 case MTFSR:
1346 case MTBSR:
1347 case MTLOCK:
1348 retval = ide_set_media_lock(drive, disk, 1);
1349 if (retval)
1350 return retval;
1351 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1352 return 0;
1353 case MTUNLOCK:
1354 retval = ide_set_media_lock(drive, disk, 0);
1355 if (retval)
1356 return retval;
1357 tape->door_locked = DOOR_UNLOCKED;
1358 return 0;
1359 default:
1360 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1361 mt_op);
1362 return -EIO;
1363 }
1364}
1365
1366/*
1367 * Our character device ioctls. General mtio.h magnetic io commands are
1368 * supported here, and not in the corresponding block interface. Our own
1369 * ide-tape ioctls are supported on both interfaces.
1370 */
1371static long do_idetape_chrdev_ioctl(struct file *file,
1372 unsigned int cmd, unsigned long arg)
1373{
1374 struct ide_tape_obj *tape = file->private_data;
1375 ide_drive_t *drive = tape->drive;
1376 struct mtop mtop;
1377 struct mtget mtget;
1378 struct mtpos mtpos;
1379 int block_offset = 0, position = tape->first_frame;
1380 void __user *argp = (void __user *)arg;
1381
1382 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd);
1383
1384 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1385 ide_tape_flush_merge_buffer(drive);
1386 idetape_flush_tape_buffers(drive);
1387 }
1388 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1389 block_offset = tape->valid /
1390 (tape->blk_size * tape->user_bs_factor);
1391 position = ide_tape_read_position(drive);
1392 if (position < 0)
1393 return -EIO;
1394 }
1395 switch (cmd) {
1396 case MTIOCTOP:
1397 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1398 return -EFAULT;
1399 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1400 case MTIOCGET:
1401 memset(&mtget, 0, sizeof(struct mtget));
1402 mtget.mt_type = MT_ISSCSI2;
1403 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1404 mtget.mt_dsreg =
1405 ((tape->blk_size * tape->user_bs_factor)
1406 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1407
1408 if (tape->drv_write_prot)
1409 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1410
1411 return put_user_mtget(argp, &mtget);
1412 case MTIOCPOS:
1413 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1414 return put_user_mtpos(argp, &mtpos);
1415 default:
1416 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1417 ide_tape_discard_merge_buffer(drive, 1);
1418 return idetape_blkdev_ioctl(drive, cmd, arg);
1419 }
1420}
1421
1422static long idetape_chrdev_ioctl(struct file *file,
1423 unsigned int cmd, unsigned long arg)
1424{
1425 long ret;
1426 mutex_lock(&ide_tape_mutex);
1427 ret = do_idetape_chrdev_ioctl(file, cmd, arg);
1428 mutex_unlock(&ide_tape_mutex);
1429 return ret;
1430}
1431
1432static long idetape_chrdev_compat_ioctl(struct file *file,
1433 unsigned int cmd, unsigned long arg)
1434{
1435 long ret;
1436
1437 if (cmd == MTIOCPOS32)
1438 cmd = MTIOCPOS;
1439 else if (cmd == MTIOCGET32)
1440 cmd = MTIOCGET;
1441
1442 mutex_lock(&ide_tape_mutex);
1443 ret = do_idetape_chrdev_ioctl(file, cmd, arg);
1444 mutex_unlock(&ide_tape_mutex);
1445 return ret;
1446}
1447
1448/*
1449 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1450 * block size with the reported value.
1451 */
1452static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1453{
1454 idetape_tape_t *tape = drive->driver_data;
1455 struct ide_atapi_pc pc;
1456 u8 buf[12];
1457
1458 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1459 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1460 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1461 if (tape->blk_size == 0) {
1462 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1463 "block size, assuming 32k\n");
1464 tape->blk_size = 32768;
1465 }
1466 return;
1467 }
1468 tape->blk_size = (buf[4 + 5] << 16) +
1469 (buf[4 + 6] << 8) +
1470 buf[4 + 7];
1471 tape->drv_write_prot = (buf[2] & 0x80) >> 7;
1472
1473 ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d",
1474 tape->blk_size, tape->drv_write_prot);
1475}
1476
1477static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1478{
1479 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1480 ide_drive_t *drive;
1481 idetape_tape_t *tape;
1482 int retval;
1483
1484 if (i >= MAX_HWIFS * MAX_DRIVES)
1485 return -ENXIO;
1486
1487 mutex_lock(&idetape_chrdev_mutex);
1488
1489 tape = ide_tape_get(NULL, true, i);
1490 if (!tape) {
1491 mutex_unlock(&idetape_chrdev_mutex);
1492 return -ENXIO;
1493 }
1494
1495 drive = tape->drive;
1496 filp->private_data = tape;
1497
1498 ide_debug_log(IDE_DBG_FUNC, "enter");
1499
1500 /*
1501 * We really want to do nonseekable_open(inode, filp); here, but some
1502 * versions of tar incorrectly call lseek on tapes and bail out if that
1503 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1504 */
1505 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1506
1507
1508 if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) {
1509 retval = -EBUSY;
1510 goto out_put_tape;
1511 }
1512
1513 retval = idetape_wait_ready(drive, 60 * HZ);
1514 if (retval) {
1515 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1516 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1517 goto out_put_tape;
1518 }
1519
1520 ide_tape_read_position(drive);
1521 if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags))
1522 (void)idetape_rewind_tape(drive);
1523
1524 /* Read block size and write protect status from drive. */
1525 ide_tape_get_bsize_from_bdesc(drive);
1526
1527 /* Set write protect flag if device is opened as read-only. */
1528 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1529 tape->write_prot = 1;
1530 else
1531 tape->write_prot = tape->drv_write_prot;
1532
1533 /* Make sure drive isn't write protected if user wants to write. */
1534 if (tape->write_prot) {
1535 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1536 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1537 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1538 retval = -EROFS;
1539 goto out_put_tape;
1540 }
1541 }
1542
1543 /* Lock the tape drive door so user can't eject. */
1544 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1545 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1546 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1547 tape->door_locked = DOOR_LOCKED;
1548 }
1549 }
1550 mutex_unlock(&idetape_chrdev_mutex);
1551
1552 return 0;
1553
1554out_put_tape:
1555 ide_tape_put(tape);
1556
1557 mutex_unlock(&idetape_chrdev_mutex);
1558
1559 return retval;
1560}
1561
1562static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1563{
1564 idetape_tape_t *tape = drive->driver_data;
1565
1566 ide_tape_flush_merge_buffer(drive);
1567 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1568 if (tape->buf != NULL) {
1569 idetape_pad_zeros(drive, tape->blk_size *
1570 (tape->user_bs_factor - 1));
1571 kfree(tape->buf);
1572 tape->buf = NULL;
1573 }
1574 idetape_write_filemark(drive);
1575 idetape_flush_tape_buffers(drive);
1576 idetape_flush_tape_buffers(drive);
1577}
1578
1579static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1580{
1581 struct ide_tape_obj *tape = filp->private_data;
1582 ide_drive_t *drive = tape->drive;
1583 unsigned int minor = iminor(inode);
1584
1585 mutex_lock(&idetape_chrdev_mutex);
1586
1587 tape = drive->driver_data;
1588
1589 ide_debug_log(IDE_DBG_FUNC, "enter");
1590
1591 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1592 idetape_write_release(drive, minor);
1593 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1594 if (minor < 128)
1595 ide_tape_discard_merge_buffer(drive, 1);
1596 }
1597
1598 if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT),
1599 &drive->atapi_flags))
1600 (void) idetape_rewind_tape(drive);
1601
1602 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1603 if (tape->door_locked == DOOR_LOCKED) {
1604 if (!ide_set_media_lock(drive, tape->disk, 0))
1605 tape->door_locked = DOOR_UNLOCKED;
1606 }
1607 }
1608 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags);
1609 ide_tape_put(tape);
1610
1611 mutex_unlock(&idetape_chrdev_mutex);
1612
1613 return 0;
1614}
1615
1616static void idetape_get_inquiry_results(ide_drive_t *drive)
1617{
1618 idetape_tape_t *tape = drive->driver_data;
1619 struct ide_atapi_pc pc;
1620 u8 pc_buf[256];
1621 char fw_rev[4], vendor_id[8], product_id[16];
1622
1623 idetape_create_inquiry_cmd(&pc);
1624 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
1625 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
1626 tape->name);
1627 return;
1628 }
1629 memcpy(vendor_id, &pc_buf[8], 8);
1630 memcpy(product_id, &pc_buf[16], 16);
1631 memcpy(fw_rev, &pc_buf[32], 4);
1632
1633 ide_fixstring(vendor_id, 8, 0);
1634 ide_fixstring(product_id, 16, 0);
1635 ide_fixstring(fw_rev, 4, 0);
1636
1637 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1638 drive->name, tape->name, vendor_id, product_id, fw_rev);
1639}
1640
1641/*
1642 * Ask the tape about its various parameters. In particular, we will adjust our
1643 * data transfer buffer size to the recommended value as returned by the tape.
1644 */
1645static void idetape_get_mode_sense_results(ide_drive_t *drive)
1646{
1647 idetape_tape_t *tape = drive->driver_data;
1648 struct ide_atapi_pc pc;
1649 u8 buf[24], *caps;
1650 u8 speed, max_speed;
1651
1652 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
1653 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1654 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
1655 " some default values\n");
1656 tape->blk_size = 512;
1657 put_unaligned(52, (u16 *)&tape->caps[12]);
1658 put_unaligned(540, (u16 *)&tape->caps[14]);
1659 put_unaligned(6*52, (u16 *)&tape->caps[16]);
1660 return;
1661 }
1662 caps = buf + 4 + buf[3];
1663
1664 /* convert to host order and save for later use */
1665 speed = be16_to_cpup((__be16 *)&caps[14]);
1666 max_speed = be16_to_cpup((__be16 *)&caps[8]);
1667
1668 *(u16 *)&caps[8] = max_speed;
1669 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
1670 *(u16 *)&caps[14] = speed;
1671 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
1672
1673 if (!speed) {
1674 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
1675 "(assuming 650KB/sec)\n", drive->name);
1676 *(u16 *)&caps[14] = 650;
1677 }
1678 if (!max_speed) {
1679 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
1680 "(assuming 650KB/sec)\n", drive->name);
1681 *(u16 *)&caps[8] = 650;
1682 }
1683
1684 memcpy(&tape->caps, caps, 20);
1685
1686 /* device lacks locking support according to capabilities page */
1687 if ((caps[6] & 1) == 0)
1688 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1689
1690 if (caps[7] & 0x02)
1691 tape->blk_size = 512;
1692 else if (caps[7] & 0x04)
1693 tape->blk_size = 1024;
1694}
1695
1696#ifdef CONFIG_IDE_PROC_FS
1697#define ide_tape_devset_get(name, field) \
1698static int get_##name(ide_drive_t *drive) \
1699{ \
1700 idetape_tape_t *tape = drive->driver_data; \
1701 return tape->field; \
1702}
1703
1704#define ide_tape_devset_set(name, field) \
1705static int set_##name(ide_drive_t *drive, int arg) \
1706{ \
1707 idetape_tape_t *tape = drive->driver_data; \
1708 tape->field = arg; \
1709 return 0; \
1710}
1711
1712#define ide_tape_devset_rw_field(_name, _field) \
1713ide_tape_devset_get(_name, _field) \
1714ide_tape_devset_set(_name, _field) \
1715IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1716
1717#define ide_tape_devset_r_field(_name, _field) \
1718ide_tape_devset_get(_name, _field) \
1719IDE_DEVSET(_name, 0, get_##_name, NULL)
1720
1721static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
1722static int divf_tdsc(ide_drive_t *drive) { return HZ; }
1723static int divf_buffer(ide_drive_t *drive) { return 2; }
1724static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
1725
1726ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1727
1728ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
1729
1730ide_tape_devset_r_field(avg_speed, avg_speed);
1731ide_tape_devset_r_field(speed, caps[14]);
1732ide_tape_devset_r_field(buffer, caps[16]);
1733ide_tape_devset_r_field(buffer_size, buffer_size);
1734
1735static const struct ide_proc_devset idetape_settings[] = {
1736 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
1737 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
1738 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
1739 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
1740 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
1741 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
1742 mulf_tdsc, divf_tdsc),
1743 { NULL },
1744};
1745#endif
1746
1747/*
1748 * The function below is called to:
1749 *
1750 * 1. Initialize our various state variables.
1751 * 2. Ask the tape for its capabilities.
1752 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1753 * is chosen based on the recommendation which we received in step 2.
1754 *
1755 * Note that at this point ide.c already assigned us an irq, so that we can
1756 * queue requests here and wait for their completion.
1757 */
1758static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1759{
1760 unsigned long t;
1761 int speed;
1762 u16 *ctl = (u16 *)&tape->caps[12];
1763
1764 ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor);
1765
1766 drive->pc_callback = ide_tape_callback;
1767
1768 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1769
1770 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1771 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1772 tape->name);
1773 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1774 }
1775
1776 /* Seagate Travan drives do not support DSC overlap. */
1777 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1778 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1779
1780 tape->minor = minor;
1781 tape->name[0] = 'h';
1782 tape->name[1] = 't';
1783 tape->name[2] = '0' + minor;
1784 tape->chrdev_dir = IDETAPE_DIR_NONE;
1785
1786 idetape_get_inquiry_results(drive);
1787 idetape_get_mode_sense_results(drive);
1788 ide_tape_get_bsize_from_bdesc(drive);
1789 tape->user_bs_factor = 1;
1790 tape->buffer_size = *ctl * tape->blk_size;
1791 while (tape->buffer_size > 0xffff) {
1792 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1793 *ctl /= 2;
1794 tape->buffer_size = *ctl * tape->blk_size;
1795 }
1796
1797 /* select the "best" DSC read/write polling freq */
1798 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1799
1800 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
1801
1802 /*
1803 * Ensure that the number we got makes sense; limit it within
1804 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1805 */
1806 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
1807 IDETAPE_DSC_RW_MAX);
1808 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1809 "%ums tDSC%s\n",
1810 drive->name, tape->name, *(u16 *)&tape->caps[14],
1811 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
1812 tape->buffer_size / 1024,
1813 jiffies_to_msecs(tape->best_dsc_rw_freq),
1814 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
1815
1816 ide_proc_register_driver(drive, tape->driver);
1817}
1818
1819static void ide_tape_remove(ide_drive_t *drive)
1820{
1821 idetape_tape_t *tape = drive->driver_data;
1822
1823 ide_proc_unregister_driver(drive, tape->driver);
1824 device_del(&tape->dev);
1825 ide_unregister_region(tape->disk);
1826
1827 mutex_lock(&idetape_ref_mutex);
1828 put_device(&tape->dev);
1829 mutex_unlock(&idetape_ref_mutex);
1830}
1831
1832static void ide_tape_release(struct device *dev)
1833{
1834 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
1835 ide_drive_t *drive = tape->drive;
1836 struct gendisk *g = tape->disk;
1837
1838 BUG_ON(tape->valid);
1839
1840 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1841 drive->driver_data = NULL;
1842 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
1843 device_destroy(idetape_sysfs_class,
1844 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1845 idetape_devs[tape->minor] = NULL;
1846 g->private_data = NULL;
1847 put_disk(g);
1848 kfree(tape);
1849}
1850
1851#ifdef CONFIG_IDE_PROC_FS
1852static int idetape_name_proc_show(struct seq_file *m, void *v)
1853{
1854 ide_drive_t *drive = (ide_drive_t *) m->private;
1855 idetape_tape_t *tape = drive->driver_data;
1856
1857 seq_printf(m, "%s\n", tape->name);
1858 return 0;
1859}
1860
1861static ide_proc_entry_t idetape_proc[] = {
1862 { "capacity", S_IFREG|S_IRUGO, ide_capacity_proc_show },
1863 { "name", S_IFREG|S_IRUGO, idetape_name_proc_show },
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 .compat_ioctl = IS_ENABLED(CONFIG_COMPAT) ?
1903 idetape_chrdev_compat_ioctl : NULL,
1904 .open = idetape_chrdev_open,
1905 .release = idetape_chrdev_release,
1906 .llseek = noop_llseek,
1907};
1908
1909static int idetape_open(struct block_device *bdev, fmode_t mode)
1910{
1911 struct ide_tape_obj *tape;
1912
1913 mutex_lock(&ide_tape_mutex);
1914 tape = ide_tape_get(bdev->bd_disk, false, 0);
1915 mutex_unlock(&ide_tape_mutex);
1916
1917 if (!tape)
1918 return -ENXIO;
1919
1920 return 0;
1921}
1922
1923static void idetape_release(struct gendisk *disk, fmode_t mode)
1924{
1925 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1926
1927 mutex_lock(&ide_tape_mutex);
1928 ide_tape_put(tape);
1929 mutex_unlock(&ide_tape_mutex);
1930}
1931
1932static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1933 unsigned int cmd, unsigned long arg)
1934{
1935 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1936 ide_drive_t *drive = tape->drive;
1937 int err;
1938
1939 mutex_lock(&ide_tape_mutex);
1940 err = generic_ide_ioctl(drive, bdev, cmd, arg);
1941 if (err == -EINVAL)
1942 err = idetape_blkdev_ioctl(drive, cmd, arg);
1943 mutex_unlock(&ide_tape_mutex);
1944
1945 return err;
1946}
1947
1948static int idetape_compat_ioctl(struct block_device *bdev, fmode_t mode,
1949 unsigned int cmd, unsigned long arg)
1950{
1951 if (cmd == 0x0340 || cmd == 0x350)
1952 arg = (unsigned long)compat_ptr(arg);
1953
1954 return idetape_ioctl(bdev, mode, cmd, arg);
1955}
1956
1957static const struct block_device_operations idetape_block_ops = {
1958 .owner = THIS_MODULE,
1959 .open = idetape_open,
1960 .release = idetape_release,
1961 .ioctl = idetape_ioctl,
1962 .compat_ioctl = IS_ENABLED(CONFIG_COMPAT) ?
1963 idetape_compat_ioctl : NULL,
1964};
1965
1966static int ide_tape_probe(ide_drive_t *drive)
1967{
1968 idetape_tape_t *tape;
1969 struct gendisk *g;
1970 int minor;
1971
1972 ide_debug_log(IDE_DBG_FUNC, "enter");
1973
1974 if (!strstr(DRV_NAME, drive->driver_req))
1975 goto failed;
1976
1977 if (drive->media != ide_tape)
1978 goto failed;
1979
1980 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1981 ide_check_atapi_device(drive, DRV_NAME) == 0) {
1982 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1983 " the driver\n", drive->name);
1984 goto failed;
1985 }
1986 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1987 if (tape == NULL) {
1988 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1989 drive->name);
1990 goto failed;
1991 }
1992
1993 g = alloc_disk(1 << PARTN_BITS);
1994 if (!g)
1995 goto out_free_tape;
1996
1997 ide_init_disk(g, drive);
1998
1999 tape->dev.parent = &drive->gendev;
2000 tape->dev.release = ide_tape_release;
2001 dev_set_name(&tape->dev, "%s", dev_name(&drive->gendev));
2002
2003 if (device_register(&tape->dev))
2004 goto out_free_disk;
2005
2006 tape->drive = drive;
2007 tape->driver = &idetape_driver;
2008 tape->disk = g;
2009
2010 g->private_data = &tape->driver;
2011
2012 drive->driver_data = tape;
2013
2014 mutex_lock(&idetape_ref_mutex);
2015 for (minor = 0; idetape_devs[minor]; minor++)
2016 ;
2017 idetape_devs[minor] = tape;
2018 mutex_unlock(&idetape_ref_mutex);
2019
2020 idetape_setup(drive, tape, minor);
2021
2022 device_create(idetape_sysfs_class, &drive->gendev,
2023 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2024 device_create(idetape_sysfs_class, &drive->gendev,
2025 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2026 "n%s", tape->name);
2027
2028 g->fops = &idetape_block_ops;
2029 ide_register_region(g);
2030
2031 return 0;
2032
2033out_free_disk:
2034 put_disk(g);
2035out_free_tape:
2036 kfree(tape);
2037failed:
2038 return -ENODEV;
2039}
2040
2041static void __exit idetape_exit(void)
2042{
2043 driver_unregister(&idetape_driver.gen_driver);
2044 class_destroy(idetape_sysfs_class);
2045 unregister_chrdev(IDETAPE_MAJOR, "ht");
2046}
2047
2048static int __init idetape_init(void)
2049{
2050 int error = 1;
2051 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2052 if (IS_ERR(idetape_sysfs_class)) {
2053 idetape_sysfs_class = NULL;
2054 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2055 error = -EBUSY;
2056 goto out;
2057 }
2058
2059 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2060 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2061 " interface\n");
2062 error = -EBUSY;
2063 goto out_free_class;
2064 }
2065
2066 error = driver_register(&idetape_driver.gen_driver);
2067 if (error)
2068 goto out_free_chrdev;
2069
2070 return 0;
2071
2072out_free_chrdev:
2073 unregister_chrdev(IDETAPE_MAJOR, "ht");
2074out_free_class:
2075 class_destroy(idetape_sysfs_class);
2076out:
2077 return error;
2078}
2079
2080MODULE_ALIAS("ide:*m-tape*");
2081module_init(idetape_init);
2082module_exit(idetape_exit);
2083MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2084MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2085MODULE_LICENSE("GPL");