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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/smp_lock.h>
36#include <linux/slab.h>
37#include <linux/pci.h>
38#include <linux/ide.h>
39#include <linux/smp_lock.h>
40#include <linux/completion.h>
41#include <linux/bitops.h>
42#include <linux/mutex.h>
43#include <scsi/scsi.h>
44
45#include <asm/byteorder.h>
46#include <linux/irq.h>
47#include <linux/uaccess.h>
48#include <linux/io.h>
49#include <asm/unaligned.h>
50#include <linux/mtio.h>
51
52/* define to see debug info */
53#undef IDETAPE_DEBUG_LOG
54
55#ifdef IDETAPE_DEBUG_LOG
56#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args)
57#else
58#define ide_debug_log(lvl, fmt, args...) do {} while (0)
59#endif
60
61/**************************** Tunable parameters *****************************/
62/*
63 * After each failed packet command we issue a request sense command and retry
64 * the packet command IDETAPE_MAX_PC_RETRIES times.
65 *
66 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
67 */
68#define IDETAPE_MAX_PC_RETRIES		3
69
70/*
71 * The following parameter is used to select the point in the internal tape fifo
72 * in which we will start to refill the buffer. Decreasing the following
73 * parameter will improve the system's latency and interactive response, while
74 * using a high value might improve system throughput.
75 */
76#define IDETAPE_FIFO_THRESHOLD		2
77
78/*
79 * DSC polling parameters.
80 *
81 * Polling for DSC (a single bit in the status register) is a very important
82 * function in ide-tape. There are two cases in which we poll for DSC:
83 *
84 * 1. Before a read/write packet command, to ensure that we can transfer data
85 * from/to the tape's data buffers, without causing an actual media access.
86 * In case the tape is not ready yet, we take out our request from the device
87 * request queue, so that ide.c could service requests from the other device
88 * on the same interface in the meantime.
89 *
90 * 2. After the successful initialization of a "media access packet command",
91 * which is a command that can take a long time to complete (the interval can
92 * range from several seconds to even an hour). Again, we postpone our request
93 * in the middle to free the bus for the other device. The polling frequency
94 * here should be lower than the read/write frequency since those media access
95 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
96 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
97 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
98 *
99 * We also set a timeout for the timer, in case something goes wrong. The
100 * timeout should be longer then the maximum execution time of a tape operation.
101 */
102
103/* DSC timings. */
104#define IDETAPE_DSC_RW_MIN		5*HZ/100	/* 50 msec */
105#define IDETAPE_DSC_RW_MAX		40*HZ/100	/* 400 msec */
106#define IDETAPE_DSC_RW_TIMEOUT		2*60*HZ		/* 2 minutes */
107#define IDETAPE_DSC_MA_FAST		2*HZ		/* 2 seconds */
108#define IDETAPE_DSC_MA_THRESHOLD	5*60*HZ		/* 5 minutes */
109#define IDETAPE_DSC_MA_SLOW		30*HZ		/* 30 seconds */
110#define IDETAPE_DSC_MA_TIMEOUT		2*60*60*HZ	/* 2 hours */
111
112/*************************** End of tunable parameters ***********************/
113
114/* tape directions */
115enum {
116	IDETAPE_DIR_NONE  = (1 << 0),
117	IDETAPE_DIR_READ  = (1 << 1),
118	IDETAPE_DIR_WRITE = (1 << 2),
119};
120
121/* Tape door status */
122#define DOOR_UNLOCKED			0
123#define DOOR_LOCKED			1
124#define DOOR_EXPLICITLY_LOCKED		2
125
126/* Some defines for the SPACE command */
127#define IDETAPE_SPACE_OVER_FILEMARK	1
128#define IDETAPE_SPACE_TO_EOD		3
129
130/* Some defines for the LOAD UNLOAD command */
131#define IDETAPE_LU_LOAD_MASK		1
132#define IDETAPE_LU_RETENSION_MASK	2
133#define IDETAPE_LU_EOT_MASK		4
134
135/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
136#define IDETAPE_BLOCK_DESCRIPTOR	0
137#define IDETAPE_CAPABILITIES_PAGE	0x2a
138
139/*
140 * Most of our global data which we need to save even as we leave the driver due
141 * to an interrupt or a timer event is stored in the struct defined below.
142 */
143typedef struct ide_tape_obj {
144	ide_drive_t		*drive;
145	struct ide_driver	*driver;
146	struct gendisk		*disk;
147	struct device		dev;
148
149	/* used by REQ_IDETAPE_{READ,WRITE} requests */
150	struct ide_atapi_pc queued_pc;
151
152	/*
153	 * DSC polling variables.
154	 *
155	 * While polling for DSC we use postponed_rq to postpone the current
156	 * request so that ide.c will be able to service pending requests on the
157	 * other device. Note that at most we will have only one DSC (usually
158	 * data transfer) request in the device request queue.
159	 */
160	bool postponed_rq;
161
162	/* The time in which we started polling for DSC */
163	unsigned long dsc_polling_start;
164	/* Timer used to poll for dsc */
165	struct timer_list dsc_timer;
166	/* Read/Write dsc polling frequency */
167	unsigned long best_dsc_rw_freq;
168	unsigned long dsc_poll_freq;
169	unsigned long dsc_timeout;
170
171	/* Read position information */
172	u8 partition;
173	/* Current block */
174	unsigned int first_frame;
175
176	/* Last error information */
177	u8 sense_key, asc, ascq;
178
179	/* Character device operation */
180	unsigned int minor;
181	/* device name */
182	char name[4];
183	/* Current character device data transfer direction */
184	u8 chrdev_dir;
185
186	/* tape block size, usually 512 or 1024 bytes */
187	unsigned short blk_size;
188	int user_bs_factor;
189
190	/* Copy of the tape's Capabilities and Mechanical Page */
191	u8 caps[20];
192
193	/*
194	 * Active data transfer request parameters.
195	 *
196	 * At most, there is only one ide-tape originated data transfer request
197	 * in the device request queue. This allows ide.c to easily service
198	 * requests from the other device when we postpone our active request.
199	 */
200
201	/* Data buffer size chosen based on the tape's recommendation */
202	int buffer_size;
203	/* Staging buffer of buffer_size bytes */
204	void *buf;
205	/* The read/write cursor */
206	void *cur;
207	/* The number of valid bytes in buf */
208	size_t valid;
209
210	/* Measures average tape speed */
211	unsigned long avg_time;
212	int avg_size;
213	int avg_speed;
214
215	/* the door is currently locked */
216	int door_locked;
217	/* the tape hardware is write protected */
218	char drv_write_prot;
219	/* the tape is write protected (hardware or opened as read-only) */
220	char write_prot;
221} idetape_tape_t;
222
223static DEFINE_MUTEX(idetape_ref_mutex);
224
225static DEFINE_MUTEX(idetape_chrdev_mutex);
226
227static struct class *idetape_sysfs_class;
228
229static void ide_tape_release(struct device *);
230
231static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
232
233static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev,
234					 unsigned int i)
235{
236	struct ide_tape_obj *tape = NULL;
237
238	mutex_lock(&idetape_ref_mutex);
239
240	if (cdev)
241		tape = idetape_devs[i];
242	else
243		tape = ide_drv_g(disk, ide_tape_obj);
244
245	if (tape) {
246		if (ide_device_get(tape->drive))
247			tape = NULL;
248		else
249			get_device(&tape->dev);
250	}
251
252	mutex_unlock(&idetape_ref_mutex);
253	return tape;
254}
255
256static void ide_tape_put(struct ide_tape_obj *tape)
257{
258	ide_drive_t *drive = tape->drive;
259
260	mutex_lock(&idetape_ref_mutex);
261	put_device(&tape->dev);
262	ide_device_put(drive);
263	mutex_unlock(&idetape_ref_mutex);
264}
265
266/*
267 * called on each failed packet command retry to analyze the request sense. We
268 * currently do not utilize this information.
269 */
270static void idetape_analyze_error(ide_drive_t *drive)
271{
272	idetape_tape_t *tape = drive->driver_data;
273	struct ide_atapi_pc *pc = drive->failed_pc;
274	struct request *rq = drive->hwif->rq;
275	u8 *sense = bio_data(rq->bio);
276
277	tape->sense_key = sense[2] & 0xF;
278	tape->asc       = sense[12];
279	tape->ascq      = sense[13];
280
281	ide_debug_log(IDE_DBG_FUNC,
282		      "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x",
283		      rq->cmd[0], tape->sense_key, tape->asc, tape->ascq);
284
285	/* correct remaining bytes to transfer */
286	if (pc->flags & PC_FLAG_DMA_ERROR)
287		rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
288
289	/*
290	 * If error was the result of a zero-length read or write command,
291	 * with sense key=5, asc=0x22, ascq=0, let it slide.  Some drives
292	 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
293	 */
294	if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
295	    /* length == 0 */
296	    && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
297		if (tape->sense_key == 5) {
298			/* don't report an error, everything's ok */
299			pc->error = 0;
300			/* don't retry read/write */
301			pc->flags |= PC_FLAG_ABORT;
302		}
303	}
304	if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
305		pc->error = IDE_DRV_ERROR_FILEMARK;
306		pc->flags |= PC_FLAG_ABORT;
307	}
308	if (pc->c[0] == WRITE_6) {
309		if ((sense[2] & 0x40) || (tape->sense_key == 0xd
310		     && tape->asc == 0x0 && tape->ascq == 0x2)) {
311			pc->error = IDE_DRV_ERROR_EOD;
312			pc->flags |= PC_FLAG_ABORT;
313		}
314	}
315	if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
316		if (tape->sense_key == 8) {
317			pc->error = IDE_DRV_ERROR_EOD;
318			pc->flags |= PC_FLAG_ABORT;
319		}
320		if (!(pc->flags & PC_FLAG_ABORT) &&
321		    (blk_rq_bytes(rq) - rq->resid_len))
322			pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
323	}
324}
325
326static void ide_tape_handle_dsc(ide_drive_t *);
327
328static int ide_tape_callback(ide_drive_t *drive, int dsc)
329{
330	idetape_tape_t *tape = drive->driver_data;
331	struct ide_atapi_pc *pc = drive->pc;
332	struct request *rq = drive->hwif->rq;
333	int uptodate = pc->error ? 0 : 1;
334	int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
335
336	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0],
337		      dsc, err);
338
339	if (dsc)
340		ide_tape_handle_dsc(drive);
341
342	if (drive->failed_pc == pc)
343		drive->failed_pc = NULL;
344
345	if (pc->c[0] == REQUEST_SENSE) {
346		if (uptodate)
347			idetape_analyze_error(drive);
348		else
349			printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
350					"itself - Aborting request!\n");
351	} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
352		unsigned int blocks =
353			(blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size;
354
355		tape->avg_size += blocks * tape->blk_size;
356
357		if (time_after_eq(jiffies, tape->avg_time + HZ)) {
358			tape->avg_speed = tape->avg_size * HZ /
359				(jiffies - tape->avg_time) / 1024;
360			tape->avg_size = 0;
361			tape->avg_time = jiffies;
362		}
363
364		tape->first_frame += blocks;
365
366		if (pc->error) {
367			uptodate = 0;
368			err = pc->error;
369		}
370	}
371	rq->errors = err;
372
373	return uptodate;
374}
375
376/*
377 * Postpone the current request so that ide.c will be able to service requests
378 * from another device on the same port while we are polling for DSC.
379 */
380static void ide_tape_stall_queue(ide_drive_t *drive)
381{
382	idetape_tape_t *tape = drive->driver_data;
383
384	ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu",
385		      drive->hwif->rq->cmd[0], tape->dsc_poll_freq);
386
387	tape->postponed_rq = true;
388
389	ide_stall_queue(drive, tape->dsc_poll_freq);
390}
391
392static void ide_tape_handle_dsc(ide_drive_t *drive)
393{
394	idetape_tape_t *tape = drive->driver_data;
395
396	/* Media access command */
397	tape->dsc_polling_start = jiffies;
398	tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
399	tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
400	/* Allow ide.c to handle other requests */
401	ide_tape_stall_queue(drive);
402}
403
404/*
405 * Packet Command Interface
406 *
407 * The current Packet Command is available in drive->pc, and will not change
408 * until we finish handling it. Each packet command is associated with a
409 * callback function that will be called when the command is finished.
410 *
411 * The handling will be done in three stages:
412 *
413 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
414 * the interrupt handler to ide_pc_intr.
415 *
416 * 2. On each interrupt, ide_pc_intr will be called. This step will be
417 * repeated until the device signals us that no more interrupts will be issued.
418 *
419 * 3. ATAPI Tape media access commands have immediate status with a delayed
420 * process. In case of a successful initiation of a media access packet command,
421 * the DSC bit will be set when the actual execution of the command is finished.
422 * Since the tape drive will not issue an interrupt, we have to poll for this
423 * event. In this case, we define the request as "low priority request" by
424 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
425 * exit the driver.
426 *
427 * ide.c will then give higher priority to requests which originate from the
428 * other device, until will change rq_status to RQ_ACTIVE.
429 *
430 * 4. When the packet command is finished, it will be checked for errors.
431 *
432 * 5. In case an error was found, we queue a request sense packet command in
433 * front of the request queue and retry the operation up to
434 * IDETAPE_MAX_PC_RETRIES times.
435 *
436 * 6. In case no error was found, or we decided to give up and not to retry
437 * again, the callback function will be called and then we will handle the next
438 * request.
439 */
440
441static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
442					 struct ide_cmd *cmd,
443					 struct ide_atapi_pc *pc)
444{
445	idetape_tape_t *tape = drive->driver_data;
446	struct request *rq = drive->hwif->rq;
447
448	if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
449		drive->failed_pc = pc;
450
451	/* Set the current packet command */
452	drive->pc = pc;
453
454	if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
455		(pc->flags & PC_FLAG_ABORT)) {
456
457		/*
458		 * We will "abort" retrying a packet command in case legitimate
459		 * error code was received (crossing a filemark, or end of the
460		 * media, for example).
461		 */
462		if (!(pc->flags & PC_FLAG_ABORT)) {
463			if (!(pc->c[0] == TEST_UNIT_READY &&
464			      tape->sense_key == 2 && tape->asc == 4 &&
465			     (tape->ascq == 1 || tape->ascq == 8))) {
466				printk(KERN_ERR "ide-tape: %s: I/O error, "
467						"pc = %2x, key = %2x, "
468						"asc = %2x, ascq = %2x\n",
469						tape->name, pc->c[0],
470						tape->sense_key, tape->asc,
471						tape->ascq);
472			}
473			/* Giving up */
474			pc->error = IDE_DRV_ERROR_GENERAL;
475		}
476
477		drive->failed_pc = NULL;
478		drive->pc_callback(drive, 0);
479		ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
480		return ide_stopped;
481	}
482	ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries,
483		      pc->c[0]);
484
485	pc->retries++;
486
487	return ide_issue_pc(drive, cmd);
488}
489
490/* A mode sense command is used to "sense" tape parameters. */
491static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
492{
493	ide_init_pc(pc);
494	pc->c[0] = MODE_SENSE;
495	if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
496		/* DBD = 1 - Don't return block descriptors */
497		pc->c[1] = 8;
498	pc->c[2] = page_code;
499	/*
500	 * Changed pc->c[3] to 0 (255 will at best return unused info).
501	 *
502	 * For SCSI this byte is defined as subpage instead of high byte
503	 * of length and some IDE drives seem to interpret it this way
504	 * and return an error when 255 is used.
505	 */
506	pc->c[3] = 0;
507	/* We will just discard data in that case */
508	pc->c[4] = 255;
509	if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
510		pc->req_xfer = 12;
511	else if (page_code == IDETAPE_CAPABILITIES_PAGE)
512		pc->req_xfer = 24;
513	else
514		pc->req_xfer = 50;
515}
516
517static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
518{
519	ide_hwif_t *hwif = drive->hwif;
520	idetape_tape_t *tape = drive->driver_data;
521	struct ide_atapi_pc *pc = drive->pc;
522	u8 stat;
523
524	stat = hwif->tp_ops->read_status(hwif);
525
526	if (stat & ATA_DSC) {
527		if (stat & ATA_ERR) {
528			/* Error detected */
529			if (pc->c[0] != TEST_UNIT_READY)
530				printk(KERN_ERR "ide-tape: %s: I/O error, ",
531						tape->name);
532			/* Retry operation */
533			ide_retry_pc(drive);
534			return ide_stopped;
535		}
536		pc->error = 0;
537	} else {
538		pc->error = IDE_DRV_ERROR_GENERAL;
539		drive->failed_pc = NULL;
540	}
541	drive->pc_callback(drive, 0);
542	return ide_stopped;
543}
544
545static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
546				   struct ide_atapi_pc *pc, struct request *rq,
547				   u8 opcode)
548{
549	unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
550
551	ide_init_pc(pc);
552	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
553	pc->c[1] = 1;
554
555	if (blk_rq_bytes(rq) == tape->buffer_size)
556		pc->flags |= PC_FLAG_DMA_OK;
557
558	if (opcode == READ_6)
559		pc->c[0] = READ_6;
560	else if (opcode == WRITE_6) {
561		pc->c[0] = WRITE_6;
562		pc->flags |= PC_FLAG_WRITING;
563	}
564
565	memcpy(rq->cmd, pc->c, 12);
566}
567
568static ide_startstop_t idetape_do_request(ide_drive_t *drive,
569					  struct request *rq, sector_t block)
570{
571	ide_hwif_t *hwif = drive->hwif;
572	idetape_tape_t *tape = drive->driver_data;
573	struct ide_atapi_pc *pc = NULL;
574	struct ide_cmd cmd;
575	u8 stat;
576
577	ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u",
578		      rq->cmd[0], (unsigned long long)blk_rq_pos(rq),
579		      blk_rq_sectors(rq));
580
581	BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL ||
582		 rq->cmd_type == REQ_TYPE_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	    (rq->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 (rq->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 (rq->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 (rq->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 (rq->cmd[13] & REQ_IDETAPE_PC1) {
642		pc = (struct ide_atapi_pc *)rq->special;
643		rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
644		rq->cmd[13] |= REQ_IDETAPE_PC2;
645		goto out;
646	}
647	if (rq->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, READ, __GFP_WAIT);
858	rq->cmd_type = REQ_TYPE_SPECIAL;
859	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_WAIT);
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 -= 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 (rq->errors == 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	lock_kernel();
1430	ret = do_idetape_chrdev_ioctl(file, cmd, arg);
1431	unlock_kernel();
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	int buffer_size;
1750	u16 *ctl = (u16 *)&tape->caps[12];
1751
1752	ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor);
1753
1754	drive->pc_callback = ide_tape_callback;
1755
1756	drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1757
1758	if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1759		printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1760				 tape->name);
1761		drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1762	}
1763
1764	/* Seagate Travan drives do not support DSC overlap. */
1765	if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1766		drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1767
1768	tape->minor = minor;
1769	tape->name[0] = 'h';
1770	tape->name[1] = 't';
1771	tape->name[2] = '0' + minor;
1772	tape->chrdev_dir = IDETAPE_DIR_NONE;
1773
1774	idetape_get_inquiry_results(drive);
1775	idetape_get_mode_sense_results(drive);
1776	ide_tape_get_bsize_from_bdesc(drive);
1777	tape->user_bs_factor = 1;
1778	tape->buffer_size = *ctl * tape->blk_size;
1779	while (tape->buffer_size > 0xffff) {
1780		printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1781		*ctl /= 2;
1782		tape->buffer_size = *ctl * tape->blk_size;
1783	}
1784	buffer_size = tape->buffer_size;
1785
1786	/* select the "best" DSC read/write polling freq */
1787	speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1788
1789	t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
1790
1791	/*
1792	 * Ensure that the number we got makes sense; limit it within
1793	 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1794	 */
1795	tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
1796					 IDETAPE_DSC_RW_MAX);
1797	printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1798		"%lums tDSC%s\n",
1799		drive->name, tape->name, *(u16 *)&tape->caps[14],
1800		(*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
1801		tape->buffer_size / 1024,
1802		tape->best_dsc_rw_freq * 1000 / HZ,
1803		(drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
1804
1805	ide_proc_register_driver(drive, tape->driver);
1806}
1807
1808static void ide_tape_remove(ide_drive_t *drive)
1809{
1810	idetape_tape_t *tape = drive->driver_data;
1811
1812	ide_proc_unregister_driver(drive, tape->driver);
1813	device_del(&tape->dev);
1814	ide_unregister_region(tape->disk);
1815
1816	mutex_lock(&idetape_ref_mutex);
1817	put_device(&tape->dev);
1818	mutex_unlock(&idetape_ref_mutex);
1819}
1820
1821static void ide_tape_release(struct device *dev)
1822{
1823	struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
1824	ide_drive_t *drive = tape->drive;
1825	struct gendisk *g = tape->disk;
1826
1827	BUG_ON(tape->valid);
1828
1829	drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1830	drive->driver_data = NULL;
1831	device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
1832	device_destroy(idetape_sysfs_class,
1833			MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1834	idetape_devs[tape->minor] = NULL;
1835	g->private_data = NULL;
1836	put_disk(g);
1837	kfree(tape);
1838}
1839
1840#ifdef CONFIG_IDE_PROC_FS
1841static int idetape_name_proc_show(struct seq_file *m, void *v)
1842{
1843	ide_drive_t	*drive = (ide_drive_t *) m->private;
1844	idetape_tape_t	*tape = drive->driver_data;
1845
1846	seq_printf(m, "%s\n", tape->name);
1847	return 0;
1848}
1849
1850static int idetape_name_proc_open(struct inode *inode, struct file *file)
1851{
1852	return single_open(file, idetape_name_proc_show, PDE(inode)->data);
1853}
1854
1855static const struct file_operations idetape_name_proc_fops = {
1856	.owner		= THIS_MODULE,
1857	.open		= idetape_name_proc_open,
1858	.read		= seq_read,
1859	.llseek		= seq_lseek,
1860	.release	= single_release,
1861};
1862
1863static ide_proc_entry_t idetape_proc[] = {
1864	{ "capacity",	S_IFREG|S_IRUGO,	&ide_capacity_proc_fops	},
1865	{ "name",	S_IFREG|S_IRUGO,	&idetape_name_proc_fops	},
1866	{}
1867};
1868
1869static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
1870{
1871	return idetape_proc;
1872}
1873
1874static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
1875{
1876	return idetape_settings;
1877}
1878#endif
1879
1880static int ide_tape_probe(ide_drive_t *);
1881
1882static struct ide_driver idetape_driver = {
1883	.gen_driver = {
1884		.owner		= THIS_MODULE,
1885		.name		= "ide-tape",
1886		.bus		= &ide_bus_type,
1887	},
1888	.probe			= ide_tape_probe,
1889	.remove			= ide_tape_remove,
1890	.version		= IDETAPE_VERSION,
1891	.do_request		= idetape_do_request,
1892#ifdef CONFIG_IDE_PROC_FS
1893	.proc_entries		= ide_tape_proc_entries,
1894	.proc_devsets		= ide_tape_proc_devsets,
1895#endif
1896};
1897
1898/* Our character device supporting functions, passed to register_chrdev. */
1899static const struct file_operations idetape_fops = {
1900	.owner		= THIS_MODULE,
1901	.read		= idetape_chrdev_read,
1902	.write		= idetape_chrdev_write,
1903	.unlocked_ioctl	= idetape_chrdev_ioctl,
1904	.open		= idetape_chrdev_open,
1905	.release	= idetape_chrdev_release,
1906};
1907
1908static int idetape_open(struct block_device *bdev, fmode_t mode)
1909{
1910	struct ide_tape_obj *tape;
1911
1912	lock_kernel();
1913	tape = ide_tape_get(bdev->bd_disk, false, 0);
1914	unlock_kernel();
1915
1916	if (!tape)
1917		return -ENXIO;
1918
1919	return 0;
1920}
1921
1922static int idetape_release(struct gendisk *disk, fmode_t mode)
1923{
1924	struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1925
1926	lock_kernel();
1927	ide_tape_put(tape);
1928	unlock_kernel();
1929
1930	return 0;
1931}
1932
1933static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1934			unsigned int cmd, unsigned long arg)
1935{
1936	struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1937	ide_drive_t *drive = tape->drive;
1938	int err;
1939
1940	lock_kernel();
1941	err = generic_ide_ioctl(drive, bdev, cmd, arg);
1942	if (err == -EINVAL)
1943		err = idetape_blkdev_ioctl(drive, cmd, arg);
1944	unlock_kernel();
1945
1946	return err;
1947}
1948
1949static const struct block_device_operations idetape_block_ops = {
1950	.owner		= THIS_MODULE,
1951	.open		= idetape_open,
1952	.release	= idetape_release,
1953	.ioctl		= idetape_ioctl,
1954};
1955
1956static int ide_tape_probe(ide_drive_t *drive)
1957{
1958	idetape_tape_t *tape;
1959	struct gendisk *g;
1960	int minor;
1961
1962	ide_debug_log(IDE_DBG_FUNC, "enter");
1963
1964	if (!strstr(DRV_NAME, drive->driver_req))
1965		goto failed;
1966
1967	if (drive->media != ide_tape)
1968		goto failed;
1969
1970	if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1971	    ide_check_atapi_device(drive, DRV_NAME) == 0) {
1972		printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1973				" the driver\n", drive->name);
1974		goto failed;
1975	}
1976	tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1977	if (tape == NULL) {
1978		printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1979				drive->name);
1980		goto failed;
1981	}
1982
1983	g = alloc_disk(1 << PARTN_BITS);
1984	if (!g)
1985		goto out_free_tape;
1986
1987	ide_init_disk(g, drive);
1988
1989	tape->dev.parent = &drive->gendev;
1990	tape->dev.release = ide_tape_release;
1991	dev_set_name(&tape->dev, dev_name(&drive->gendev));
1992
1993	if (device_register(&tape->dev))
1994		goto out_free_disk;
1995
1996	tape->drive = drive;
1997	tape->driver = &idetape_driver;
1998	tape->disk = g;
1999
2000	g->private_data = &tape->driver;
2001
2002	drive->driver_data = tape;
2003
2004	mutex_lock(&idetape_ref_mutex);
2005	for (minor = 0; idetape_devs[minor]; minor++)
2006		;
2007	idetape_devs[minor] = tape;
2008	mutex_unlock(&idetape_ref_mutex);
2009
2010	idetape_setup(drive, tape, minor);
2011
2012	device_create(idetape_sysfs_class, &drive->gendev,
2013		      MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2014	device_create(idetape_sysfs_class, &drive->gendev,
2015		      MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2016		      "n%s", tape->name);
2017
2018	g->fops = &idetape_block_ops;
2019	ide_register_region(g);
2020
2021	return 0;
2022
2023out_free_disk:
2024	put_disk(g);
2025out_free_tape:
2026	kfree(tape);
2027failed:
2028	return -ENODEV;
2029}
2030
2031static void __exit idetape_exit(void)
2032{
2033	driver_unregister(&idetape_driver.gen_driver);
2034	class_destroy(idetape_sysfs_class);
2035	unregister_chrdev(IDETAPE_MAJOR, "ht");
2036}
2037
2038static int __init idetape_init(void)
2039{
2040	int error = 1;
2041	idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2042	if (IS_ERR(idetape_sysfs_class)) {
2043		idetape_sysfs_class = NULL;
2044		printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2045		error = -EBUSY;
2046		goto out;
2047	}
2048
2049	if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2050		printk(KERN_ERR "ide-tape: Failed to register chrdev"
2051				" interface\n");
2052		error = -EBUSY;
2053		goto out_free_class;
2054	}
2055
2056	error = driver_register(&idetape_driver.gen_driver);
2057	if (error)
2058		goto out_free_driver;
2059
2060	return 0;
2061
2062out_free_driver:
2063	driver_unregister(&idetape_driver.gen_driver);
2064out_free_class:
2065	class_destroy(idetape_sysfs_class);
2066out:
2067	return error;
2068}
2069
2070MODULE_ALIAS("ide:*m-tape*");
2071module_init(idetape_init);
2072module_exit(idetape_exit);
2073MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2074MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2075MODULE_LICENSE("GPL");
2076