ide-tape.c revision 626542ca2277961aaa64855206574f8ca4f360e3
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/slab.h>
35#include <linux/pci.h>
36#include <linux/ide.h>
37#include <linux/smp_lock.h>
38#include <linux/completion.h>
39#include <linux/bitops.h>
40#include <linux/mutex.h>
41#include <scsi/scsi.h>
42
43#include <asm/byteorder.h>
44#include <linux/irq.h>
45#include <linux/uaccess.h>
46#include <linux/io.h>
47#include <asm/unaligned.h>
48#include <linux/mtio.h>
49
50enum {
51	/* output errors only */
52	DBG_ERR =		(1 << 0),
53	/* output all sense key/asc */
54	DBG_SENSE =		(1 << 1),
55	/* info regarding all chrdev-related procedures */
56	DBG_CHRDEV =		(1 << 2),
57	/* all remaining procedures */
58	DBG_PROCS =		(1 << 3),
59};
60
61/* define to see debug info */
62#define IDETAPE_DEBUG_LOG		0
63
64#if IDETAPE_DEBUG_LOG
65#define debug_log(lvl, fmt, args...)			\
66{							\
67	if (tape->debug_mask & lvl)			\
68	printk(KERN_INFO "ide-tape: " fmt, ## args);	\
69}
70#else
71#define debug_log(lvl, fmt, args...) do {} while (0)
72#endif
73
74/**************************** Tunable parameters *****************************/
75/*
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
78 *
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
80 */
81#define IDETAPE_MAX_PC_RETRIES		3
82
83/*
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
88 */
89#define IDETAPE_FIFO_THRESHOLD		2
90
91/*
92 * DSC polling parameters.
93 *
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
96 *
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
102 *
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
111 *
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
114 */
115
116/* DSC timings. */
117#define IDETAPE_DSC_RW_MIN		5*HZ/100	/* 50 msec */
118#define IDETAPE_DSC_RW_MAX		40*HZ/100	/* 400 msec */
119#define IDETAPE_DSC_RW_TIMEOUT		2*60*HZ		/* 2 minutes */
120#define IDETAPE_DSC_MA_FAST		2*HZ		/* 2 seconds */
121#define IDETAPE_DSC_MA_THRESHOLD	5*60*HZ		/* 5 minutes */
122#define IDETAPE_DSC_MA_SLOW		30*HZ		/* 30 seconds */
123#define IDETAPE_DSC_MA_TIMEOUT		2*60*60*HZ	/* 2 hours */
124
125/*************************** End of tunable parameters ***********************/
126
127/* tape directions */
128enum {
129	IDETAPE_DIR_NONE  = (1 << 0),
130	IDETAPE_DIR_READ  = (1 << 1),
131	IDETAPE_DIR_WRITE = (1 << 2),
132};
133
134/* Tape door status */
135#define DOOR_UNLOCKED			0
136#define DOOR_LOCKED			1
137#define DOOR_EXPLICITLY_LOCKED		2
138
139/* Some defines for the SPACE command */
140#define IDETAPE_SPACE_OVER_FILEMARK	1
141#define IDETAPE_SPACE_TO_EOD		3
142
143/* Some defines for the LOAD UNLOAD command */
144#define IDETAPE_LU_LOAD_MASK		1
145#define IDETAPE_LU_RETENSION_MASK	2
146#define IDETAPE_LU_EOT_MASK		4
147
148/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
149#define IDETAPE_BLOCK_DESCRIPTOR	0
150#define IDETAPE_CAPABILITIES_PAGE	0x2a
151
152/*
153 * Most of our global data which we need to save even as we leave the driver due
154 * to an interrupt or a timer event is stored in the struct defined below.
155 */
156typedef struct ide_tape_obj {
157	ide_drive_t		*drive;
158	struct ide_driver	*driver;
159	struct gendisk		*disk;
160	struct device		dev;
161
162	/* used by REQ_IDETAPE_{READ,WRITE} requests */
163	struct ide_atapi_pc queued_pc;
164
165	/*
166	 * DSC polling variables.
167	 *
168	 * While polling for DSC we use postponed_rq to postpone the current
169	 * request so that ide.c will be able to service pending requests on the
170	 * other device. Note that at most we will have only one DSC (usually
171	 * data transfer) request in the device request queue.
172	 */
173	struct request *postponed_rq;
174	/* The time in which we started polling for DSC */
175	unsigned long dsc_polling_start;
176	/* Timer used to poll for dsc */
177	struct timer_list dsc_timer;
178	/* Read/Write dsc polling frequency */
179	unsigned long best_dsc_rw_freq;
180	unsigned long dsc_poll_freq;
181	unsigned long dsc_timeout;
182
183	/* Read position information */
184	u8 partition;
185	/* Current block */
186	unsigned int first_frame;
187
188	/* Last error information */
189	u8 sense_key, asc, ascq;
190
191	/* Character device operation */
192	unsigned int minor;
193	/* device name */
194	char name[4];
195	/* Current character device data transfer direction */
196	u8 chrdev_dir;
197
198	/* tape block size, usually 512 or 1024 bytes */
199	unsigned short blk_size;
200	int user_bs_factor;
201
202	/* Copy of the tape's Capabilities and Mechanical Page */
203	u8 caps[20];
204
205	/*
206	 * Active data transfer request parameters.
207	 *
208	 * At most, there is only one ide-tape originated data transfer request
209	 * in the device request queue. This allows ide.c to easily service
210	 * requests from the other device when we postpone our active request.
211	 */
212
213	/* Data buffer size chosen based on the tape's recommendation */
214	int buffer_size;
215	/* Staging buffer of buffer_size bytes */
216	void *buf;
217	/* The read/write cursor */
218	void *cur;
219	/* The number of valid bytes in buf */
220	size_t valid;
221
222	/* Measures average tape speed */
223	unsigned long avg_time;
224	int avg_size;
225	int avg_speed;
226
227	/* the door is currently locked */
228	int door_locked;
229	/* the tape hardware is write protected */
230	char drv_write_prot;
231	/* the tape is write protected (hardware or opened as read-only) */
232	char write_prot;
233
234	u32 debug_mask;
235} idetape_tape_t;
236
237static DEFINE_MUTEX(idetape_ref_mutex);
238
239static struct class *idetape_sysfs_class;
240
241static void ide_tape_release(struct device *);
242
243static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
244{
245	struct ide_tape_obj *tape = NULL;
246
247	mutex_lock(&idetape_ref_mutex);
248	tape = ide_drv_g(disk, ide_tape_obj);
249	if (tape) {
250		if (ide_device_get(tape->drive))
251			tape = NULL;
252		else
253			get_device(&tape->dev);
254	}
255	mutex_unlock(&idetape_ref_mutex);
256	return tape;
257}
258
259static void ide_tape_put(struct ide_tape_obj *tape)
260{
261	ide_drive_t *drive = tape->drive;
262
263	mutex_lock(&idetape_ref_mutex);
264	put_device(&tape->dev);
265	ide_device_put(drive);
266	mutex_unlock(&idetape_ref_mutex);
267}
268
269/*
270 * The variables below are used for the character device interface. Additional
271 * state variables are defined in our ide_drive_t structure.
272 */
273static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
274
275static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
276{
277	struct ide_tape_obj *tape = NULL;
278
279	mutex_lock(&idetape_ref_mutex);
280	tape = idetape_devs[i];
281	if (tape)
282		get_device(&tape->dev);
283	mutex_unlock(&idetape_ref_mutex);
284	return tape;
285}
286
287/*
288 * called on each failed packet command retry to analyze the request sense. We
289 * currently do not utilize this information.
290 */
291static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
292{
293	idetape_tape_t *tape = drive->driver_data;
294	struct ide_atapi_pc *pc = drive->failed_pc;
295
296	tape->sense_key = sense[2] & 0xF;
297	tape->asc       = sense[12];
298	tape->ascq      = sense[13];
299
300	debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
301		 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
302
303	/* Correct pc->xferred by asking the tape.	 */
304	if (pc->flags & PC_FLAG_DMA_ERROR)
305		pc->xferred = pc->req_xfer -
306			tape->blk_size *
307			get_unaligned_be32(&sense[3]);
308
309	/*
310	 * If error was the result of a zero-length read or write command,
311	 * with sense key=5, asc=0x22, ascq=0, let it slide.  Some drives
312	 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
313	 */
314	if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
315	    /* length == 0 */
316	    && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
317		if (tape->sense_key == 5) {
318			/* don't report an error, everything's ok */
319			pc->error = 0;
320			/* don't retry read/write */
321			pc->flags |= PC_FLAG_ABORT;
322		}
323	}
324	if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
325		pc->error = IDE_DRV_ERROR_FILEMARK;
326		pc->flags |= PC_FLAG_ABORT;
327	}
328	if (pc->c[0] == WRITE_6) {
329		if ((sense[2] & 0x40) || (tape->sense_key == 0xd
330		     && tape->asc == 0x0 && tape->ascq == 0x2)) {
331			pc->error = IDE_DRV_ERROR_EOD;
332			pc->flags |= PC_FLAG_ABORT;
333		}
334	}
335	if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
336		if (tape->sense_key == 8) {
337			pc->error = IDE_DRV_ERROR_EOD;
338			pc->flags |= PC_FLAG_ABORT;
339		}
340		if (!(pc->flags & PC_FLAG_ABORT) &&
341		    pc->xferred)
342			pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
343	}
344}
345
346static void ide_tape_handle_dsc(ide_drive_t *);
347
348static int ide_tape_callback(ide_drive_t *drive, int dsc)
349{
350	idetape_tape_t *tape = drive->driver_data;
351	struct ide_atapi_pc *pc = drive->pc;
352	struct request *rq = drive->hwif->rq;
353	int uptodate = pc->error ? 0 : 1;
354	int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
355
356	debug_log(DBG_PROCS, "Enter %s\n", __func__);
357
358	if (dsc)
359		ide_tape_handle_dsc(drive);
360
361	if (drive->failed_pc == pc)
362		drive->failed_pc = NULL;
363
364	if (pc->c[0] == REQUEST_SENSE) {
365		if (uptodate)
366			idetape_analyze_error(drive, pc->buf);
367		else
368			printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
369					"itself - Aborting request!\n");
370	} else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
371		int blocks = pc->xferred / tape->blk_size;
372
373		tape->avg_size += blocks * tape->blk_size;
374
375		if (time_after_eq(jiffies, tape->avg_time + HZ)) {
376			tape->avg_speed = tape->avg_size * HZ /
377				(jiffies - tape->avg_time) / 1024;
378			tape->avg_size = 0;
379			tape->avg_time = jiffies;
380		}
381
382		tape->first_frame += blocks;
383		rq->data_len -= blocks * tape->blk_size;
384
385		if (pc->error) {
386			uptodate = 0;
387			err = pc->error;
388		}
389	} else if (pc->c[0] == READ_POSITION && uptodate) {
390		u8 *readpos = pc->buf;
391
392		debug_log(DBG_SENSE, "BOP - %s\n",
393				(readpos[0] & 0x80) ? "Yes" : "No");
394		debug_log(DBG_SENSE, "EOP - %s\n",
395				(readpos[0] & 0x40) ? "Yes" : "No");
396
397		if (readpos[0] & 0x4) {
398			printk(KERN_INFO "ide-tape: Block location is unknown"
399					 "to the tape\n");
400			clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
401			uptodate = 0;
402			err = IDE_DRV_ERROR_GENERAL;
403		} else {
404			debug_log(DBG_SENSE, "Block Location - %u\n",
405					be32_to_cpup((__be32 *)&readpos[4]));
406
407			tape->partition = readpos[1];
408			tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
409			set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
410		}
411	}
412
413	rq->errors = err;
414
415	return uptodate;
416}
417
418/*
419 * Postpone the current request so that ide.c will be able to service requests
420 * from another device on the same port while we are polling for DSC.
421 */
422static void idetape_postpone_request(ide_drive_t *drive)
423{
424	idetape_tape_t *tape = drive->driver_data;
425
426	debug_log(DBG_PROCS, "Enter %s\n", __func__);
427
428	tape->postponed_rq = drive->hwif->rq;
429
430	ide_stall_queue(drive, tape->dsc_poll_freq);
431}
432
433static void ide_tape_handle_dsc(ide_drive_t *drive)
434{
435	idetape_tape_t *tape = drive->driver_data;
436
437	/* Media access command */
438	tape->dsc_polling_start = jiffies;
439	tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
440	tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
441	/* Allow ide.c to handle other requests */
442	idetape_postpone_request(drive);
443}
444
445/*
446 * Packet Command Interface
447 *
448 * The current Packet Command is available in drive->pc, and will not change
449 * until we finish handling it. Each packet command is associated with a
450 * callback function that will be called when the command is finished.
451 *
452 * The handling will be done in three stages:
453 *
454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
455 * the interrupt handler to ide_pc_intr.
456 *
457 * 2. On each interrupt, ide_pc_intr will be called. This step will be
458 * repeated until the device signals us that no more interrupts will be issued.
459 *
460 * 3. ATAPI Tape media access commands have immediate status with a delayed
461 * process. In case of a successful initiation of a media access packet command,
462 * the DSC bit will be set when the actual execution of the command is finished.
463 * Since the tape drive will not issue an interrupt, we have to poll for this
464 * event. In this case, we define the request as "low priority request" by
465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
466 * exit the driver.
467 *
468 * ide.c will then give higher priority to requests which originate from the
469 * other device, until will change rq_status to RQ_ACTIVE.
470 *
471 * 4. When the packet command is finished, it will be checked for errors.
472 *
473 * 5. In case an error was found, we queue a request sense packet command in
474 * front of the request queue and retry the operation up to
475 * IDETAPE_MAX_PC_RETRIES times.
476 *
477 * 6. In case no error was found, or we decided to give up and not to retry
478 * again, the callback function will be called and then we will handle the next
479 * request.
480 */
481
482static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
483					 struct ide_cmd *cmd,
484					 struct ide_atapi_pc *pc)
485{
486	idetape_tape_t *tape = drive->driver_data;
487
488	if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
489		drive->failed_pc = pc;
490
491	/* Set the current packet command */
492	drive->pc = pc;
493
494	if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
495		(pc->flags & PC_FLAG_ABORT)) {
496		unsigned int done = blk_rq_bytes(drive->hwif->rq);
497
498		/*
499		 * We will "abort" retrying a packet command in case legitimate
500		 * error code was received (crossing a filemark, or end of the
501		 * media, for example).
502		 */
503		if (!(pc->flags & PC_FLAG_ABORT)) {
504			if (!(pc->c[0] == TEST_UNIT_READY &&
505			      tape->sense_key == 2 && tape->asc == 4 &&
506			     (tape->ascq == 1 || tape->ascq == 8))) {
507				printk(KERN_ERR "ide-tape: %s: I/O error, "
508						"pc = %2x, key = %2x, "
509						"asc = %2x, ascq = %2x\n",
510						tape->name, pc->c[0],
511						tape->sense_key, tape->asc,
512						tape->ascq);
513			}
514			/* Giving up */
515			pc->error = IDE_DRV_ERROR_GENERAL;
516		}
517
518		drive->failed_pc = NULL;
519		drive->pc_callback(drive, 0);
520		ide_complete_rq(drive, -EIO, done);
521		return ide_stopped;
522	}
523	debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
524
525	pc->retries++;
526
527	return ide_issue_pc(drive, cmd);
528}
529
530/* A mode sense command is used to "sense" tape parameters. */
531static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
532{
533	ide_init_pc(pc);
534	pc->c[0] = MODE_SENSE;
535	if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
536		/* DBD = 1 - Don't return block descriptors */
537		pc->c[1] = 8;
538	pc->c[2] = page_code;
539	/*
540	 * Changed pc->c[3] to 0 (255 will at best return unused info).
541	 *
542	 * For SCSI this byte is defined as subpage instead of high byte
543	 * of length and some IDE drives seem to interpret it this way
544	 * and return an error when 255 is used.
545	 */
546	pc->c[3] = 0;
547	/* We will just discard data in that case */
548	pc->c[4] = 255;
549	if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
550		pc->req_xfer = 12;
551	else if (page_code == IDETAPE_CAPABILITIES_PAGE)
552		pc->req_xfer = 24;
553	else
554		pc->req_xfer = 50;
555}
556
557static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
558{
559	ide_hwif_t *hwif = drive->hwif;
560	idetape_tape_t *tape = drive->driver_data;
561	struct ide_atapi_pc *pc = drive->pc;
562	u8 stat;
563
564	stat = hwif->tp_ops->read_status(hwif);
565
566	if (stat & ATA_DSC) {
567		if (stat & ATA_ERR) {
568			/* Error detected */
569			if (pc->c[0] != TEST_UNIT_READY)
570				printk(KERN_ERR "ide-tape: %s: I/O error, ",
571						tape->name);
572			/* Retry operation */
573			ide_retry_pc(drive);
574			return ide_stopped;
575		}
576		pc->error = 0;
577	} else {
578		pc->error = IDE_DRV_ERROR_GENERAL;
579		drive->failed_pc = NULL;
580	}
581	drive->pc_callback(drive, 0);
582	return ide_stopped;
583}
584
585static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
586				   struct ide_atapi_pc *pc, struct request *rq,
587				   u8 opcode)
588{
589	unsigned int length = rq->nr_sectors;
590
591	ide_init_pc(pc);
592	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
593	pc->c[1] = 1;
594	pc->buf = NULL;
595	pc->buf_size = length * tape->blk_size;
596	pc->req_xfer = pc->buf_size;
597	if (pc->req_xfer == tape->buffer_size)
598		pc->flags |= PC_FLAG_DMA_OK;
599
600	if (opcode == READ_6)
601		pc->c[0] = READ_6;
602	else if (opcode == WRITE_6) {
603		pc->c[0] = WRITE_6;
604		pc->flags |= PC_FLAG_WRITING;
605	}
606
607	memcpy(rq->cmd, pc->c, 12);
608}
609
610static ide_startstop_t idetape_do_request(ide_drive_t *drive,
611					  struct request *rq, sector_t block)
612{
613	ide_hwif_t *hwif = drive->hwif;
614	idetape_tape_t *tape = drive->driver_data;
615	struct ide_atapi_pc *pc = NULL;
616	struct request *postponed_rq = tape->postponed_rq;
617	struct ide_cmd cmd;
618	u8 stat;
619
620	debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n",
621		  (unsigned long long)rq->sector, rq->nr_sectors);
622
623	if (!(blk_special_request(rq) || blk_sense_request(rq))) {
624		/* We do not support buffer cache originated requests. */
625		printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
626			"request queue (%d)\n", drive->name, rq->cmd_type);
627		if (blk_fs_request(rq) == 0 && rq->errors == 0)
628			rq->errors = -EIO;
629		ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
630		return ide_stopped;
631	}
632
633	/* Retry a failed packet command */
634	if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
635		pc = drive->failed_pc;
636		goto out;
637	}
638
639	if (postponed_rq != NULL)
640		if (rq != postponed_rq) {
641			printk(KERN_ERR "ide-tape: ide-tape.c bug - "
642					"Two DSC requests were queued\n");
643			drive->failed_pc = NULL;
644			rq->errors = 0;
645			ide_complete_rq(drive, 0, blk_rq_bytes(rq));
646			return ide_stopped;
647		}
648
649	tape->postponed_rq = NULL;
650
651	/*
652	 * If the tape is still busy, postpone our request and service
653	 * the other device meanwhile.
654	 */
655	stat = hwif->tp_ops->read_status(hwif);
656
657	if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
658	    (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
659		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
660
661	if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
662		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
663		drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
664	}
665
666	if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) &&
667	    !(stat & ATA_DSC)) {
668		if (postponed_rq == NULL) {
669			tape->dsc_polling_start = jiffies;
670			tape->dsc_poll_freq = tape->best_dsc_rw_freq;
671			tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
672		} else if (time_after(jiffies, tape->dsc_timeout)) {
673			printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
674				tape->name);
675			if (rq->cmd[13] & REQ_IDETAPE_PC2) {
676				idetape_media_access_finished(drive);
677				return ide_stopped;
678			} else {
679				return ide_do_reset(drive);
680			}
681		} else if (time_after(jiffies,
682					tape->dsc_polling_start +
683					IDETAPE_DSC_MA_THRESHOLD))
684			tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
685		idetape_postpone_request(drive);
686		return ide_stopped;
687	} else
688		drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC;
689
690	if (rq->cmd[13] & REQ_IDETAPE_READ) {
691		pc = &tape->queued_pc;
692		ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
693		goto out;
694	}
695	if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
696		pc = &tape->queued_pc;
697		ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
698		goto out;
699	}
700	if (rq->cmd[13] & REQ_IDETAPE_PC1) {
701		pc = (struct ide_atapi_pc *)rq->special;
702		rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
703		rq->cmd[13] |= REQ_IDETAPE_PC2;
704		goto out;
705	}
706	if (rq->cmd[13] & REQ_IDETAPE_PC2) {
707		idetape_media_access_finished(drive);
708		return ide_stopped;
709	}
710	BUG();
711
712out:
713	/* prepare sense request for this command */
714	ide_prep_sense(drive, rq);
715
716	memset(&cmd, 0, sizeof(cmd));
717
718	if (rq_data_dir(rq))
719		cmd.tf_flags |= IDE_TFLAG_WRITE;
720
721	cmd.rq = rq;
722
723	ide_init_sg_cmd(&cmd, pc->req_xfer);
724	ide_map_sg(drive, &cmd);
725
726	return ide_tape_issue_pc(drive, &cmd, pc);
727}
728
729/*
730 * Write a filemark if write_filemark=1. Flush the device buffers without
731 * writing a filemark otherwise.
732 */
733static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
734		struct ide_atapi_pc *pc, int write_filemark)
735{
736	ide_init_pc(pc);
737	pc->c[0] = WRITE_FILEMARKS;
738	pc->c[4] = write_filemark;
739	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
740}
741
742static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
743{
744	idetape_tape_t *tape = drive->driver_data;
745	struct gendisk *disk = tape->disk;
746	int load_attempted = 0;
747
748	/* Wait for the tape to become ready */
749	set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
750	timeout += jiffies;
751	while (time_before(jiffies, timeout)) {
752		if (ide_do_test_unit_ready(drive, disk) == 0)
753			return 0;
754		if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
755		    || (tape->asc == 0x3A)) {
756			/* no media */
757			if (load_attempted)
758				return -ENOMEDIUM;
759			ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
760			load_attempted = 1;
761		/* not about to be ready */
762		} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
763			     (tape->ascq == 1 || tape->ascq == 8)))
764			return -EIO;
765		msleep(100);
766	}
767	return -EIO;
768}
769
770static int idetape_flush_tape_buffers(ide_drive_t *drive)
771{
772	struct ide_tape_obj *tape = drive->driver_data;
773	struct ide_atapi_pc pc;
774	int rc;
775
776	idetape_create_write_filemark_cmd(drive, &pc, 0);
777	rc = ide_queue_pc_tail(drive, tape->disk, &pc);
778	if (rc)
779		return rc;
780	idetape_wait_ready(drive, 60 * 5 * HZ);
781	return 0;
782}
783
784static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
785{
786	ide_init_pc(pc);
787	pc->c[0] = READ_POSITION;
788	pc->req_xfer = 20;
789}
790
791static int idetape_read_position(ide_drive_t *drive)
792{
793	idetape_tape_t *tape = drive->driver_data;
794	struct ide_atapi_pc pc;
795	int position;
796
797	debug_log(DBG_PROCS, "Enter %s\n", __func__);
798
799	idetape_create_read_position_cmd(&pc);
800	if (ide_queue_pc_tail(drive, tape->disk, &pc))
801		return -1;
802	position = tape->first_frame;
803	return position;
804}
805
806static void idetape_create_locate_cmd(ide_drive_t *drive,
807		struct ide_atapi_pc *pc,
808		unsigned int block, u8 partition, int skip)
809{
810	ide_init_pc(pc);
811	pc->c[0] = POSITION_TO_ELEMENT;
812	pc->c[1] = 2;
813	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
814	pc->c[8] = partition;
815	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
816}
817
818static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
819{
820	idetape_tape_t *tape = drive->driver_data;
821
822	if (tape->chrdev_dir != IDETAPE_DIR_READ)
823		return;
824
825	clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
826	tape->valid = 0;
827	if (tape->buf != NULL) {
828		kfree(tape->buf);
829		tape->buf = NULL;
830	}
831
832	tape->chrdev_dir = IDETAPE_DIR_NONE;
833}
834
835/*
836 * Position the tape to the requested block using the LOCATE packet command.
837 * A READ POSITION command is then issued to check where we are positioned. Like
838 * all higher level operations, we queue the commands at the tail of the request
839 * queue and wait for their completion.
840 */
841static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
842		u8 partition, int skip)
843{
844	idetape_tape_t *tape = drive->driver_data;
845	struct gendisk *disk = tape->disk;
846	int retval;
847	struct ide_atapi_pc pc;
848
849	if (tape->chrdev_dir == IDETAPE_DIR_READ)
850		__ide_tape_discard_merge_buffer(drive);
851	idetape_wait_ready(drive, 60 * 5 * HZ);
852	idetape_create_locate_cmd(drive, &pc, block, partition, skip);
853	retval = ide_queue_pc_tail(drive, disk, &pc);
854	if (retval)
855		return (retval);
856
857	idetape_create_read_position_cmd(&pc);
858	return ide_queue_pc_tail(drive, disk, &pc);
859}
860
861static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
862					  int restore_position)
863{
864	idetape_tape_t *tape = drive->driver_data;
865	int seek, position;
866
867	__ide_tape_discard_merge_buffer(drive);
868	if (restore_position) {
869		position = idetape_read_position(drive);
870		seek = position > 0 ? position : 0;
871		if (idetape_position_tape(drive, seek, 0, 0)) {
872			printk(KERN_INFO "ide-tape: %s: position_tape failed in"
873					 " %s\n", tape->name, __func__);
874			return;
875		}
876	}
877}
878
879/*
880 * Generate a read/write request for the block device interface and wait for it
881 * to be serviced.
882 */
883static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
884{
885	idetape_tape_t *tape = drive->driver_data;
886	struct request *rq;
887	int ret;
888
889	debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
890	BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
891	BUG_ON(size < 0 || size % tape->blk_size);
892
893	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
894	rq->cmd_type = REQ_TYPE_SPECIAL;
895	rq->cmd[13] = cmd;
896	rq->rq_disk = tape->disk;
897	rq->sector = tape->first_frame;
898
899	if (size) {
900		ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
901				      __GFP_WAIT);
902		if (ret)
903			goto out_put;
904	}
905
906	blk_execute_rq(drive->queue, tape->disk, rq, 0);
907
908	/* calculate the number of transferred bytes and update buffer state */
909	size -= rq->data_len;
910	tape->cur = tape->buf;
911	if (cmd == REQ_IDETAPE_READ)
912		tape->valid = size;
913	else
914		tape->valid = 0;
915
916	ret = size;
917	if (rq->errors == IDE_DRV_ERROR_GENERAL)
918		ret = -EIO;
919out_put:
920	blk_put_request(rq);
921	return ret;
922}
923
924static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
925{
926	ide_init_pc(pc);
927	pc->c[0] = INQUIRY;
928	pc->c[4] = 254;
929	pc->req_xfer = 254;
930}
931
932static void idetape_create_rewind_cmd(ide_drive_t *drive,
933		struct ide_atapi_pc *pc)
934{
935	ide_init_pc(pc);
936	pc->c[0] = REZERO_UNIT;
937	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
938}
939
940static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
941{
942	ide_init_pc(pc);
943	pc->c[0] = ERASE;
944	pc->c[1] = 1;
945	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
946}
947
948static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
949{
950	ide_init_pc(pc);
951	pc->c[0] = SPACE;
952	put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
953	pc->c[1] = cmd;
954	pc->flags |= PC_FLAG_WAIT_FOR_DSC;
955}
956
957static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
958{
959	idetape_tape_t *tape = drive->driver_data;
960
961	if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
962		printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
963				" but we are not writing.\n");
964		return;
965	}
966	if (tape->buf) {
967		size_t aligned = roundup(tape->valid, tape->blk_size);
968
969		memset(tape->cur, 0, aligned - tape->valid);
970		idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
971		kfree(tape->buf);
972		tape->buf = NULL;
973	}
974	tape->chrdev_dir = IDETAPE_DIR_NONE;
975}
976
977static int idetape_init_rw(ide_drive_t *drive, int dir)
978{
979	idetape_tape_t *tape = drive->driver_data;
980	int rc;
981
982	BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
983
984	if (tape->chrdev_dir == dir)
985		return 0;
986
987	if (tape->chrdev_dir == IDETAPE_DIR_READ)
988		ide_tape_discard_merge_buffer(drive, 1);
989	else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
990		ide_tape_flush_merge_buffer(drive);
991		idetape_flush_tape_buffers(drive);
992	}
993
994	if (tape->buf || tape->valid) {
995		printk(KERN_ERR "ide-tape: valid should be 0 now\n");
996		tape->valid = 0;
997	}
998
999	tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1000	if (!tape->buf)
1001		return -ENOMEM;
1002	tape->chrdev_dir = dir;
1003	tape->cur = tape->buf;
1004
1005	/*
1006	 * Issue a 0 rw command to ensure that DSC handshake is
1007	 * switched from completion mode to buffer available mode.  No
1008	 * point in issuing this if DSC overlap isn't supported, some
1009	 * drives (Seagate STT3401A) will return an error.
1010	 */
1011	if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1012		int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
1013						  : REQ_IDETAPE_WRITE;
1014
1015		rc = idetape_queue_rw_tail(drive, cmd, 0);
1016		if (rc < 0) {
1017			kfree(tape->buf);
1018			tape->buf = NULL;
1019			tape->chrdev_dir = IDETAPE_DIR_NONE;
1020			return rc;
1021		}
1022	}
1023
1024	return 0;
1025}
1026
1027static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1028{
1029	idetape_tape_t *tape = drive->driver_data;
1030
1031	memset(tape->buf, 0, tape->buffer_size);
1032
1033	while (bcount) {
1034		unsigned int count = min(tape->buffer_size, bcount);
1035
1036		idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
1037		bcount -= count;
1038	}
1039}
1040
1041/*
1042 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1043 * currently support only one partition.
1044 */
1045static int idetape_rewind_tape(ide_drive_t *drive)
1046{
1047	struct ide_tape_obj *tape = drive->driver_data;
1048	struct gendisk *disk = tape->disk;
1049	int retval;
1050	struct ide_atapi_pc pc;
1051
1052	debug_log(DBG_SENSE, "Enter %s\n", __func__);
1053
1054	idetape_create_rewind_cmd(drive, &pc);
1055	retval = ide_queue_pc_tail(drive, disk, &pc);
1056	if (retval)
1057		return retval;
1058
1059	idetape_create_read_position_cmd(&pc);
1060	retval = ide_queue_pc_tail(drive, disk, &pc);
1061	if (retval)
1062		return retval;
1063	return 0;
1064}
1065
1066/* mtio.h compatible commands should be issued to the chrdev interface. */
1067static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1068				unsigned long arg)
1069{
1070	idetape_tape_t *tape = drive->driver_data;
1071	void __user *argp = (void __user *)arg;
1072
1073	struct idetape_config {
1074		int dsc_rw_frequency;
1075		int dsc_media_access_frequency;
1076		int nr_stages;
1077	} config;
1078
1079	debug_log(DBG_PROCS, "Enter %s\n", __func__);
1080
1081	switch (cmd) {
1082	case 0x0340:
1083		if (copy_from_user(&config, argp, sizeof(config)))
1084			return -EFAULT;
1085		tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1086		break;
1087	case 0x0350:
1088		config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1089		config.nr_stages = 1;
1090		if (copy_to_user(argp, &config, sizeof(config)))
1091			return -EFAULT;
1092		break;
1093	default:
1094		return -EIO;
1095	}
1096	return 0;
1097}
1098
1099static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1100					int mt_count)
1101{
1102	idetape_tape_t *tape = drive->driver_data;
1103	struct gendisk *disk = tape->disk;
1104	struct ide_atapi_pc pc;
1105	int retval, count = 0;
1106	int sprev = !!(tape->caps[4] & 0x20);
1107
1108	if (mt_count == 0)
1109		return 0;
1110	if (MTBSF == mt_op || MTBSFM == mt_op) {
1111		if (!sprev)
1112			return -EIO;
1113		mt_count = -mt_count;
1114	}
1115
1116	if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1117		tape->valid = 0;
1118		if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1119			++count;
1120		ide_tape_discard_merge_buffer(drive, 0);
1121	}
1122
1123	switch (mt_op) {
1124	case MTFSF:
1125	case MTBSF:
1126		idetape_create_space_cmd(&pc, mt_count - count,
1127					 IDETAPE_SPACE_OVER_FILEMARK);
1128		return ide_queue_pc_tail(drive, disk, &pc);
1129	case MTFSFM:
1130	case MTBSFM:
1131		if (!sprev)
1132			return -EIO;
1133		retval = idetape_space_over_filemarks(drive, MTFSF,
1134						      mt_count - count);
1135		if (retval)
1136			return retval;
1137		count = (MTBSFM == mt_op ? 1 : -1);
1138		return idetape_space_over_filemarks(drive, MTFSF, count);
1139	default:
1140		printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1141				mt_op);
1142		return -EIO;
1143	}
1144}
1145
1146/*
1147 * Our character device read / write functions.
1148 *
1149 * The tape is optimized to maximize throughput when it is transferring an
1150 * integral number of the "continuous transfer limit", which is a parameter of
1151 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1152 *
1153 * As of version 1.3 of the driver, the character device provides an abstract
1154 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1155 * same backup/restore procedure is supported. The driver will internally
1156 * convert the requests to the recommended transfer unit, so that an unmatch
1157 * between the user's block size to the recommended size will only result in a
1158 * (slightly) increased driver overhead, but will no longer hit performance.
1159 * This is not applicable to Onstream.
1160 */
1161static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1162				   size_t count, loff_t *ppos)
1163{
1164	struct ide_tape_obj *tape = file->private_data;
1165	ide_drive_t *drive = tape->drive;
1166	size_t done = 0;
1167	ssize_t ret = 0;
1168	int rc;
1169
1170	debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1171
1172	if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1173		if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1174			if (count > tape->blk_size &&
1175			    (count % tape->blk_size) == 0)
1176				tape->user_bs_factor = count / tape->blk_size;
1177	}
1178
1179	rc = idetape_init_rw(drive, IDETAPE_DIR_READ);
1180	if (rc < 0)
1181		return rc;
1182
1183	while (done < count) {
1184		size_t todo;
1185
1186		/* refill if staging buffer is empty */
1187		if (!tape->valid) {
1188			/* If we are at a filemark, nothing more to read */
1189			if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1190				break;
1191			/* read */
1192			if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
1193						  tape->buffer_size) <= 0)
1194				break;
1195		}
1196
1197		/* copy out */
1198		todo = min_t(size_t, count - done, tape->valid);
1199		if (copy_to_user(buf + done, tape->cur, todo))
1200			ret = -EFAULT;
1201
1202		tape->cur += todo;
1203		tape->valid -= todo;
1204		done += todo;
1205	}
1206
1207	if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1208		debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1209
1210		idetape_space_over_filemarks(drive, MTFSF, 1);
1211		return 0;
1212	}
1213
1214	return ret ? ret : done;
1215}
1216
1217static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1218				     size_t count, loff_t *ppos)
1219{
1220	struct ide_tape_obj *tape = file->private_data;
1221	ide_drive_t *drive = tape->drive;
1222	size_t done = 0;
1223	ssize_t ret = 0;
1224	int rc;
1225
1226	/* The drive is write protected. */
1227	if (tape->write_prot)
1228		return -EACCES;
1229
1230	debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1231
1232	/* Initialize write operation */
1233	rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
1234	if (rc < 0)
1235		return rc;
1236
1237	while (done < count) {
1238		size_t todo;
1239
1240		/* flush if staging buffer is full */
1241		if (tape->valid == tape->buffer_size &&
1242		    idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1243					  tape->buffer_size) <= 0)
1244			return rc;
1245
1246		/* copy in */
1247		todo = min_t(size_t, count - done,
1248			     tape->buffer_size - tape->valid);
1249		if (copy_from_user(tape->cur, buf + done, todo))
1250			ret = -EFAULT;
1251
1252		tape->cur += todo;
1253		tape->valid += todo;
1254		done += todo;
1255	}
1256
1257	return ret ? ret : done;
1258}
1259
1260static int idetape_write_filemark(ide_drive_t *drive)
1261{
1262	struct ide_tape_obj *tape = drive->driver_data;
1263	struct ide_atapi_pc pc;
1264
1265	/* Write a filemark */
1266	idetape_create_write_filemark_cmd(drive, &pc, 1);
1267	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1268		printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1269		return -EIO;
1270	}
1271	return 0;
1272}
1273
1274/*
1275 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1276 * requested.
1277 *
1278 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1279 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1280 * usually not supported.
1281 *
1282 * The following commands are currently not supported:
1283 *
1284 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1285 * MT_ST_WRITE_THRESHOLD.
1286 */
1287static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1288{
1289	idetape_tape_t *tape = drive->driver_data;
1290	struct gendisk *disk = tape->disk;
1291	struct ide_atapi_pc pc;
1292	int i, retval;
1293
1294	debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1295			mt_op, mt_count);
1296
1297	switch (mt_op) {
1298	case MTFSF:
1299	case MTFSFM:
1300	case MTBSF:
1301	case MTBSFM:
1302		if (!mt_count)
1303			return 0;
1304		return idetape_space_over_filemarks(drive, mt_op, mt_count);
1305	default:
1306		break;
1307	}
1308
1309	switch (mt_op) {
1310	case MTWEOF:
1311		if (tape->write_prot)
1312			return -EACCES;
1313		ide_tape_discard_merge_buffer(drive, 1);
1314		for (i = 0; i < mt_count; i++) {
1315			retval = idetape_write_filemark(drive);
1316			if (retval)
1317				return retval;
1318		}
1319		return 0;
1320	case MTREW:
1321		ide_tape_discard_merge_buffer(drive, 0);
1322		if (idetape_rewind_tape(drive))
1323			return -EIO;
1324		return 0;
1325	case MTLOAD:
1326		ide_tape_discard_merge_buffer(drive, 0);
1327		return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1328	case MTUNLOAD:
1329	case MTOFFL:
1330		/*
1331		 * If door is locked, attempt to unlock before
1332		 * attempting to eject.
1333		 */
1334		if (tape->door_locked) {
1335			if (!ide_set_media_lock(drive, disk, 0))
1336				tape->door_locked = DOOR_UNLOCKED;
1337		}
1338		ide_tape_discard_merge_buffer(drive, 0);
1339		retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1340		if (!retval)
1341			clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1342		return retval;
1343	case MTNOP:
1344		ide_tape_discard_merge_buffer(drive, 0);
1345		return idetape_flush_tape_buffers(drive);
1346	case MTRETEN:
1347		ide_tape_discard_merge_buffer(drive, 0);
1348		return ide_do_start_stop(drive, disk,
1349			IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1350	case MTEOM:
1351		idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1352		return ide_queue_pc_tail(drive, disk, &pc);
1353	case MTERASE:
1354		(void)idetape_rewind_tape(drive);
1355		idetape_create_erase_cmd(&pc);
1356		return ide_queue_pc_tail(drive, disk, &pc);
1357	case MTSETBLK:
1358		if (mt_count) {
1359			if (mt_count < tape->blk_size ||
1360			    mt_count % tape->blk_size)
1361				return -EIO;
1362			tape->user_bs_factor = mt_count / tape->blk_size;
1363			clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1364		} else
1365			set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1366		return 0;
1367	case MTSEEK:
1368		ide_tape_discard_merge_buffer(drive, 0);
1369		return idetape_position_tape(drive,
1370			mt_count * tape->user_bs_factor, tape->partition, 0);
1371	case MTSETPART:
1372		ide_tape_discard_merge_buffer(drive, 0);
1373		return idetape_position_tape(drive, 0, mt_count, 0);
1374	case MTFSR:
1375	case MTBSR:
1376	case MTLOCK:
1377		retval = ide_set_media_lock(drive, disk, 1);
1378		if (retval)
1379			return retval;
1380		tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1381		return 0;
1382	case MTUNLOCK:
1383		retval = ide_set_media_lock(drive, disk, 0);
1384		if (retval)
1385			return retval;
1386		tape->door_locked = DOOR_UNLOCKED;
1387		return 0;
1388	default:
1389		printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1390				mt_op);
1391		return -EIO;
1392	}
1393}
1394
1395/*
1396 * Our character device ioctls. General mtio.h magnetic io commands are
1397 * supported here, and not in the corresponding block interface. Our own
1398 * ide-tape ioctls are supported on both interfaces.
1399 */
1400static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1401				unsigned int cmd, unsigned long arg)
1402{
1403	struct ide_tape_obj *tape = file->private_data;
1404	ide_drive_t *drive = tape->drive;
1405	struct mtop mtop;
1406	struct mtget mtget;
1407	struct mtpos mtpos;
1408	int block_offset = 0, position = tape->first_frame;
1409	void __user *argp = (void __user *)arg;
1410
1411	debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1412
1413	if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1414		ide_tape_flush_merge_buffer(drive);
1415		idetape_flush_tape_buffers(drive);
1416	}
1417	if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1418		block_offset = tape->valid /
1419			(tape->blk_size * tape->user_bs_factor);
1420		position = idetape_read_position(drive);
1421		if (position < 0)
1422			return -EIO;
1423	}
1424	switch (cmd) {
1425	case MTIOCTOP:
1426		if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1427			return -EFAULT;
1428		return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1429	case MTIOCGET:
1430		memset(&mtget, 0, sizeof(struct mtget));
1431		mtget.mt_type = MT_ISSCSI2;
1432		mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1433		mtget.mt_dsreg =
1434			((tape->blk_size * tape->user_bs_factor)
1435			 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1436
1437		if (tape->drv_write_prot)
1438			mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1439
1440		if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1441			return -EFAULT;
1442		return 0;
1443	case MTIOCPOS:
1444		mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1445		if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1446			return -EFAULT;
1447		return 0;
1448	default:
1449		if (tape->chrdev_dir == IDETAPE_DIR_READ)
1450			ide_tape_discard_merge_buffer(drive, 1);
1451		return idetape_blkdev_ioctl(drive, cmd, arg);
1452	}
1453}
1454
1455/*
1456 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1457 * block size with the reported value.
1458 */
1459static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1460{
1461	idetape_tape_t *tape = drive->driver_data;
1462	struct ide_atapi_pc pc;
1463
1464	idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1465	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1466		printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1467		if (tape->blk_size == 0) {
1468			printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1469					    "block size, assuming 32k\n");
1470			tape->blk_size = 32768;
1471		}
1472		return;
1473	}
1474	tape->blk_size = (pc.buf[4 + 5] << 16) +
1475				(pc.buf[4 + 6] << 8)  +
1476				 pc.buf[4 + 7];
1477	tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1478}
1479
1480static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1481{
1482	unsigned int minor = iminor(inode), i = minor & ~0xc0;
1483	ide_drive_t *drive;
1484	idetape_tape_t *tape;
1485	int retval;
1486
1487	if (i >= MAX_HWIFS * MAX_DRIVES)
1488		return -ENXIO;
1489
1490	lock_kernel();
1491	tape = ide_tape_chrdev_get(i);
1492	if (!tape) {
1493		unlock_kernel();
1494		return -ENXIO;
1495	}
1496
1497	debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1498
1499	/*
1500	 * We really want to do nonseekable_open(inode, filp); here, but some
1501	 * versions of tar incorrectly call lseek on tapes and bail out if that
1502	 * fails.  So we disallow pread() and pwrite(), but permit lseeks.
1503	 */
1504	filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1505
1506	drive = tape->drive;
1507
1508	filp->private_data = tape;
1509
1510	if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1511		retval = -EBUSY;
1512		goto out_put_tape;
1513	}
1514
1515	retval = idetape_wait_ready(drive, 60 * HZ);
1516	if (retval) {
1517		clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1518		printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1519		goto out_put_tape;
1520	}
1521
1522	idetape_read_position(drive);
1523	if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1524		(void)idetape_rewind_tape(drive);
1525
1526	/* Read block size and write protect status from drive. */
1527	ide_tape_get_bsize_from_bdesc(drive);
1528
1529	/* Set write protect flag if device is opened as read-only. */
1530	if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1531		tape->write_prot = 1;
1532	else
1533		tape->write_prot = tape->drv_write_prot;
1534
1535	/* Make sure drive isn't write protected if user wants to write. */
1536	if (tape->write_prot) {
1537		if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1538		    (filp->f_flags & O_ACCMODE) == O_RDWR) {
1539			clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1540			retval = -EROFS;
1541			goto out_put_tape;
1542		}
1543	}
1544
1545	/* Lock the tape drive door so user can't eject. */
1546	if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1547		if (!ide_set_media_lock(drive, tape->disk, 1)) {
1548			if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1549				tape->door_locked = DOOR_LOCKED;
1550		}
1551	}
1552	unlock_kernel();
1553	return 0;
1554
1555out_put_tape:
1556	ide_tape_put(tape);
1557	unlock_kernel();
1558	return retval;
1559}
1560
1561static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1562{
1563	idetape_tape_t *tape = drive->driver_data;
1564
1565	ide_tape_flush_merge_buffer(drive);
1566	tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1567	if (tape->buf != NULL) {
1568		idetape_pad_zeros(drive, tape->blk_size *
1569				(tape->user_bs_factor - 1));
1570		kfree(tape->buf);
1571		tape->buf = NULL;
1572	}
1573	idetape_write_filemark(drive);
1574	idetape_flush_tape_buffers(drive);
1575	idetape_flush_tape_buffers(drive);
1576}
1577
1578static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1579{
1580	struct ide_tape_obj *tape = filp->private_data;
1581	ide_drive_t *drive = tape->drive;
1582	unsigned int minor = iminor(inode);
1583
1584	lock_kernel();
1585	tape = drive->driver_data;
1586
1587	debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1588
1589	if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1590		idetape_write_release(drive, minor);
1591	if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1592		if (minor < 128)
1593			ide_tape_discard_merge_buffer(drive, 1);
1594	}
1595
1596	if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
1597		(void) idetape_rewind_tape(drive);
1598	if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1599		if (tape->door_locked == DOOR_LOCKED) {
1600			if (!ide_set_media_lock(drive, tape->disk, 0))
1601				tape->door_locked = DOOR_UNLOCKED;
1602		}
1603	}
1604	clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1605	ide_tape_put(tape);
1606	unlock_kernel();
1607	return 0;
1608}
1609
1610static void idetape_get_inquiry_results(ide_drive_t *drive)
1611{
1612	idetape_tape_t *tape = drive->driver_data;
1613	struct ide_atapi_pc pc;
1614	u8 pc_buf[256];
1615	char fw_rev[4], vendor_id[8], product_id[16];
1616
1617	idetape_create_inquiry_cmd(&pc);
1618	pc.buf = &pc_buf[0];
1619	pc.buf_size = sizeof(pc_buf);
1620
1621	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1622		printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
1623				tape->name);
1624		return;
1625	}
1626	memcpy(vendor_id, &pc.buf[8], 8);
1627	memcpy(product_id, &pc.buf[16], 16);
1628	memcpy(fw_rev, &pc.buf[32], 4);
1629
1630	ide_fixstring(vendor_id, 8, 0);
1631	ide_fixstring(product_id, 16, 0);
1632	ide_fixstring(fw_rev, 4, 0);
1633
1634	printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1635			drive->name, tape->name, vendor_id, product_id, fw_rev);
1636}
1637
1638/*
1639 * Ask the tape about its various parameters. In particular, we will adjust our
1640 * data transfer buffer	size to the recommended value as returned by the tape.
1641 */
1642static void idetape_get_mode_sense_results(ide_drive_t *drive)
1643{
1644	idetape_tape_t *tape = drive->driver_data;
1645	struct ide_atapi_pc pc;
1646	u8 *caps;
1647	u8 speed, max_speed;
1648
1649	idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
1650	if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1651		printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
1652				" some default values\n");
1653		tape->blk_size = 512;
1654		put_unaligned(52,   (u16 *)&tape->caps[12]);
1655		put_unaligned(540,  (u16 *)&tape->caps[14]);
1656		put_unaligned(6*52, (u16 *)&tape->caps[16]);
1657		return;
1658	}
1659	caps = pc.buf + 4 + pc.buf[3];
1660
1661	/* convert to host order and save for later use */
1662	speed = be16_to_cpup((__be16 *)&caps[14]);
1663	max_speed = be16_to_cpup((__be16 *)&caps[8]);
1664
1665	*(u16 *)&caps[8] = max_speed;
1666	*(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
1667	*(u16 *)&caps[14] = speed;
1668	*(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
1669
1670	if (!speed) {
1671		printk(KERN_INFO "ide-tape: %s: invalid tape speed "
1672				"(assuming 650KB/sec)\n", drive->name);
1673		*(u16 *)&caps[14] = 650;
1674	}
1675	if (!max_speed) {
1676		printk(KERN_INFO "ide-tape: %s: invalid max_speed "
1677				"(assuming 650KB/sec)\n", drive->name);
1678		*(u16 *)&caps[8] = 650;
1679	}
1680
1681	memcpy(&tape->caps, caps, 20);
1682
1683	/* device lacks locking support according to capabilities page */
1684	if ((caps[6] & 1) == 0)
1685		drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1686
1687	if (caps[7] & 0x02)
1688		tape->blk_size = 512;
1689	else if (caps[7] & 0x04)
1690		tape->blk_size = 1024;
1691}
1692
1693#ifdef CONFIG_IDE_PROC_FS
1694#define ide_tape_devset_get(name, field) \
1695static int get_##name(ide_drive_t *drive) \
1696{ \
1697	idetape_tape_t *tape = drive->driver_data; \
1698	return tape->field; \
1699}
1700
1701#define ide_tape_devset_set(name, field) \
1702static int set_##name(ide_drive_t *drive, int arg) \
1703{ \
1704	idetape_tape_t *tape = drive->driver_data; \
1705	tape->field = arg; \
1706	return 0; \
1707}
1708
1709#define ide_tape_devset_rw_field(_name, _field) \
1710ide_tape_devset_get(_name, _field) \
1711ide_tape_devset_set(_name, _field) \
1712IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1713
1714#define ide_tape_devset_r_field(_name, _field) \
1715ide_tape_devset_get(_name, _field) \
1716IDE_DEVSET(_name, 0, get_##_name, NULL)
1717
1718static int mulf_tdsc(ide_drive_t *drive)	{ return 1000; }
1719static int divf_tdsc(ide_drive_t *drive)	{ return   HZ; }
1720static int divf_buffer(ide_drive_t *drive)	{ return    2; }
1721static int divf_buffer_size(ide_drive_t *drive)	{ return 1024; }
1722
1723ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1724
1725ide_tape_devset_rw_field(debug_mask, debug_mask);
1726ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
1727
1728ide_tape_devset_r_field(avg_speed, avg_speed);
1729ide_tape_devset_r_field(speed, caps[14]);
1730ide_tape_devset_r_field(buffer, caps[16]);
1731ide_tape_devset_r_field(buffer_size, buffer_size);
1732
1733static const struct ide_proc_devset idetape_settings[] = {
1734	__IDE_PROC_DEVSET(avg_speed,	0, 0xffff, NULL, NULL),
1735	__IDE_PROC_DEVSET(buffer,	0, 0xffff, NULL, divf_buffer),
1736	__IDE_PROC_DEVSET(buffer_size,	0, 0xffff, NULL, divf_buffer_size),
1737	__IDE_PROC_DEVSET(debug_mask,	0, 0xffff, NULL, NULL),
1738	__IDE_PROC_DEVSET(dsc_overlap,	0,      1, NULL, NULL),
1739	__IDE_PROC_DEVSET(speed,	0, 0xffff, NULL, NULL),
1740	__IDE_PROC_DEVSET(tdsc,		IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
1741					mulf_tdsc, divf_tdsc),
1742	{ NULL },
1743};
1744#endif
1745
1746/*
1747 * The function below is called to:
1748 *
1749 * 1. Initialize our various state variables.
1750 * 2. Ask the tape for its capabilities.
1751 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1752 * is chosen based on the recommendation which we received in step 2.
1753 *
1754 * Note that at this point ide.c already assigned us an irq, so that we can
1755 * queue requests here and wait for their completion.
1756 */
1757static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1758{
1759	unsigned long t;
1760	int speed;
1761	int buffer_size;
1762	u16 *ctl = (u16 *)&tape->caps[12];
1763
1764	drive->pc_callback	 = ide_tape_callback;
1765
1766	drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1767
1768	if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1769		printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1770				 tape->name);
1771		drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1772	}
1773
1774	/* Seagate Travan drives do not support DSC overlap. */
1775	if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1776		drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1777
1778	tape->minor = minor;
1779	tape->name[0] = 'h';
1780	tape->name[1] = 't';
1781	tape->name[2] = '0' + minor;
1782	tape->chrdev_dir = IDETAPE_DIR_NONE;
1783
1784	idetape_get_inquiry_results(drive);
1785	idetape_get_mode_sense_results(drive);
1786	ide_tape_get_bsize_from_bdesc(drive);
1787	tape->user_bs_factor = 1;
1788	tape->buffer_size = *ctl * tape->blk_size;
1789	while (tape->buffer_size > 0xffff) {
1790		printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1791		*ctl /= 2;
1792		tape->buffer_size = *ctl * tape->blk_size;
1793	}
1794	buffer_size = tape->buffer_size;
1795
1796	/* select the "best" DSC read/write polling freq */
1797	speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1798
1799	t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
1800
1801	/*
1802	 * Ensure that the number we got makes sense; limit it within
1803	 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1804	 */
1805	tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
1806					 IDETAPE_DSC_RW_MAX);
1807	printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1808		"%lums tDSC%s\n",
1809		drive->name, tape->name, *(u16 *)&tape->caps[14],
1810		(*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
1811		tape->buffer_size / 1024,
1812		tape->best_dsc_rw_freq * 1000 / HZ,
1813		(drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
1814
1815	ide_proc_register_driver(drive, tape->driver);
1816}
1817
1818static void ide_tape_remove(ide_drive_t *drive)
1819{
1820	idetape_tape_t *tape = drive->driver_data;
1821
1822	ide_proc_unregister_driver(drive, tape->driver);
1823	device_del(&tape->dev);
1824	ide_unregister_region(tape->disk);
1825
1826	mutex_lock(&idetape_ref_mutex);
1827	put_device(&tape->dev);
1828	mutex_unlock(&idetape_ref_mutex);
1829}
1830
1831static void ide_tape_release(struct device *dev)
1832{
1833	struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
1834	ide_drive_t *drive = tape->drive;
1835	struct gendisk *g = tape->disk;
1836
1837	BUG_ON(tape->valid);
1838
1839	drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1840	drive->driver_data = NULL;
1841	device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
1842	device_destroy(idetape_sysfs_class,
1843			MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1844	idetape_devs[tape->minor] = NULL;
1845	g->private_data = NULL;
1846	put_disk(g);
1847	kfree(tape);
1848}
1849
1850#ifdef CONFIG_IDE_PROC_FS
1851static int proc_idetape_read_name
1852	(char *page, char **start, off_t off, int count, int *eof, void *data)
1853{
1854	ide_drive_t	*drive = (ide_drive_t *) data;
1855	idetape_tape_t	*tape = drive->driver_data;
1856	char		*out = page;
1857	int		len;
1858
1859	len = sprintf(out, "%s\n", tape->name);
1860	PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1861}
1862
1863static ide_proc_entry_t idetape_proc[] = {
1864	{ "capacity",	S_IFREG|S_IRUGO,	proc_ide_read_capacity, NULL },
1865	{ "name",	S_IFREG|S_IRUGO,	proc_idetape_read_name,	NULL },
1866	{ NULL, 0, NULL, NULL }
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	.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 = ide_tape_get(bdev->bd_disk);
1911
1912	if (!tape)
1913		return -ENXIO;
1914
1915	return 0;
1916}
1917
1918static int idetape_release(struct gendisk *disk, fmode_t mode)
1919{
1920	struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1921
1922	ide_tape_put(tape);
1923	return 0;
1924}
1925
1926static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1927			unsigned int cmd, unsigned long arg)
1928{
1929	struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1930	ide_drive_t *drive = tape->drive;
1931	int err = generic_ide_ioctl(drive, bdev, cmd, arg);
1932	if (err == -EINVAL)
1933		err = idetape_blkdev_ioctl(drive, cmd, arg);
1934	return err;
1935}
1936
1937static struct block_device_operations idetape_block_ops = {
1938	.owner		= THIS_MODULE,
1939	.open		= idetape_open,
1940	.release	= idetape_release,
1941	.locked_ioctl	= idetape_ioctl,
1942};
1943
1944static int ide_tape_probe(ide_drive_t *drive)
1945{
1946	idetape_tape_t *tape;
1947	struct gendisk *g;
1948	int minor;
1949
1950	if (!strstr("ide-tape", drive->driver_req))
1951		goto failed;
1952
1953	if (drive->media != ide_tape)
1954		goto failed;
1955
1956	if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1957	    ide_check_atapi_device(drive, DRV_NAME) == 0) {
1958		printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1959				" the driver\n", drive->name);
1960		goto failed;
1961	}
1962	tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1963	if (tape == NULL) {
1964		printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1965				drive->name);
1966		goto failed;
1967	}
1968
1969	g = alloc_disk(1 << PARTN_BITS);
1970	if (!g)
1971		goto out_free_tape;
1972
1973	ide_init_disk(g, drive);
1974
1975	tape->dev.parent = &drive->gendev;
1976	tape->dev.release = ide_tape_release;
1977	dev_set_name(&tape->dev, dev_name(&drive->gendev));
1978
1979	if (device_register(&tape->dev))
1980		goto out_free_disk;
1981
1982	tape->drive = drive;
1983	tape->driver = &idetape_driver;
1984	tape->disk = g;
1985
1986	g->private_data = &tape->driver;
1987
1988	drive->driver_data = tape;
1989
1990	mutex_lock(&idetape_ref_mutex);
1991	for (minor = 0; idetape_devs[minor]; minor++)
1992		;
1993	idetape_devs[minor] = tape;
1994	mutex_unlock(&idetape_ref_mutex);
1995
1996	idetape_setup(drive, tape, minor);
1997
1998	device_create(idetape_sysfs_class, &drive->gendev,
1999		      MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2000	device_create(idetape_sysfs_class, &drive->gendev,
2001		      MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2002		      "n%s", tape->name);
2003
2004	g->fops = &idetape_block_ops;
2005	ide_register_region(g);
2006
2007	return 0;
2008
2009out_free_disk:
2010	put_disk(g);
2011out_free_tape:
2012	kfree(tape);
2013failed:
2014	return -ENODEV;
2015}
2016
2017static void __exit idetape_exit(void)
2018{
2019	driver_unregister(&idetape_driver.gen_driver);
2020	class_destroy(idetape_sysfs_class);
2021	unregister_chrdev(IDETAPE_MAJOR, "ht");
2022}
2023
2024static int __init idetape_init(void)
2025{
2026	int error = 1;
2027	idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2028	if (IS_ERR(idetape_sysfs_class)) {
2029		idetape_sysfs_class = NULL;
2030		printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2031		error = -EBUSY;
2032		goto out;
2033	}
2034
2035	if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2036		printk(KERN_ERR "ide-tape: Failed to register chrdev"
2037				" interface\n");
2038		error = -EBUSY;
2039		goto out_free_class;
2040	}
2041
2042	error = driver_register(&idetape_driver.gen_driver);
2043	if (error)
2044		goto out_free_driver;
2045
2046	return 0;
2047
2048out_free_driver:
2049	driver_unregister(&idetape_driver.gen_driver);
2050out_free_class:
2051	class_destroy(idetape_sysfs_class);
2052out:
2053	return error;
2054}
2055
2056MODULE_ALIAS("ide:*m-tape*");
2057module_init(idetape_init);
2058module_exit(idetape_exit);
2059MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2060MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2061MODULE_LICENSE("GPL");
2062