[mirror_ubuntu-hirsute-kernel.git] / drivers / md / md-faulty.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * faulty.c : Multiple Devices driver for Linux
 *
 * Copyright (C) 2004 Neil Brown
 *
 * fautly-device-simulator personality for md
 */


/*
 * The "faulty" personality causes some requests to fail.
 *
 * Possible failure modes are:
 *   reads fail "randomly" but succeed on retry
 *   writes fail "randomly" but succeed on retry
 *   reads for some address fail and then persist until a write
 *   reads for some address fail and then persist irrespective of write
 *   writes for some address fail and persist
 *   all writes fail
 *
 * Different modes can be active at a time, but only
 * one can be set at array creation.  Others can be added later.
 * A mode can be one-shot or recurrent with the recurrence being
 * once in every N requests.
 * The bottom 5 bits of the "layout" indicate the mode.  The
 * remainder indicate a period, or 0 for one-shot.
 *
 * There is an implementation limit on the number of concurrently
 * persisting-faulty blocks. When a new fault is requested that would
 * exceed the limit, it is ignored.
 * All current faults can be clear using a layout of "0".
 *
 * Requests are always sent to the device.  If they are to fail,
 * we clone the bio and insert a new b_end_io into the chain.
 */

#define	WriteTransient	0
#define	ReadTransient	1
#define	WritePersistent	2
#define	ReadPersistent	3
#define	WriteAll	4 /* doesn't go to device */
#define	ReadFixable	5
#define	Modes	6

#define	ClearErrors	31
#define	ClearFaults	30

#define AllPersist	100 /* internal use only */
#define	NoPersist	101

#define	ModeMask	0x1f
#define	ModeShift	5

#define MaxFault	50
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/raid/md_u.h>
#include <linux/slab.h>
#include "md.h"
#include <linux/seq_file.h>


static void faulty_fail(struct bio *bio)
{
	struct bio *b = bio->bi_private;

	b->bi_iter.bi_size = bio->bi_iter.bi_size;
	b->bi_iter.bi_sector = bio->bi_iter.bi_sector;

	bio_put(bio);

	bio_io_error(b);
}

struct faulty_conf {
	int period[Modes];
	atomic_t counters[Modes];
	sector_t faults[MaxFault];
	int	modes[MaxFault];
	int nfaults;
	struct md_rdev *rdev;
};

static int check_mode(struct faulty_conf *conf, int mode)
{
	if (conf->period[mode] == 0 &&
	    atomic_read(&conf->counters[mode]) <= 0)
		return 0; /* no failure, no decrement */


	if (atomic_dec_and_test(&conf->counters[mode])) {
		if (conf->period[mode])
			atomic_set(&conf->counters[mode], conf->period[mode]);
		return 1;
	}
	return 0;
}

static int check_sector(struct faulty_conf *conf, sector_t start, sector_t end, int dir)
{
	/* If we find a ReadFixable sector, we fix it ... */
	int i;
	for (i=0; i<conf->nfaults; i++)
		if (conf->faults[i] >= start &&
		    conf->faults[i] < end) {
			/* found it ... */
			switch (conf->modes[i] * 2 + dir) {
			case WritePersistent*2+WRITE: return 1;
			case ReadPersistent*2+READ: return 1;
			case ReadFixable*2+READ: return 1;
			case ReadFixable*2+WRITE:
				conf->modes[i] = NoPersist;
				return 0;
			case AllPersist*2+READ:
			case AllPersist*2+WRITE: return 1;
			default:
				return 0;
			}
		}
	return 0;
}

static void add_sector(struct faulty_conf *conf, sector_t start, int mode)
{
	int i;
	int n = conf->nfaults;
	for (i=0; i<conf->nfaults; i++)
		if (conf->faults[i] == start) {
			switch(mode) {
			case NoPersist: conf->modes[i] = mode; return;
			case WritePersistent:
				if (conf->modes[i] == ReadPersistent ||
				    conf->modes[i] == ReadFixable)
					conf->modes[i] = AllPersist;
				else
					conf->modes[i] = WritePersistent;
				return;
			case ReadPersistent:
				if (conf->modes[i] == WritePersistent)
					conf->modes[i] = AllPersist;
				else
					conf->modes[i] = ReadPersistent;
				return;
			case ReadFixable:
				if (conf->modes[i] == WritePersistent ||
				    conf->modes[i] == ReadPersistent)
					conf->modes[i] = AllPersist;
				else
					conf->modes[i] = ReadFixable;
				return;
			}
		} else if (conf->modes[i] == NoPersist)
			n = i;

	if (n >= MaxFault)
		return;
	conf->faults[n] = start;
	conf->modes[n] = mode;
	if (conf->nfaults == n)
		conf->nfaults = n+1;
}

static bool faulty_make_request(struct mddev *mddev, struct bio *bio)
{
	struct faulty_conf *conf = mddev->private;
	int failit = 0;

	if (bio_data_dir(bio) == WRITE) {
		/* write request */
		if (atomic_read(&conf->counters[WriteAll])) {
			/* special case - don't decrement, don't generic_make_request,
			 * just fail immediately
			 */
			bio_io_error(bio);
			return true;
		}

		if (check_sector(conf, bio->bi_iter.bi_sector,
				 bio_end_sector(bio), WRITE))
			failit = 1;
		if (check_mode(conf, WritePersistent)) {
			add_sector(conf, bio->bi_iter.bi_sector,
				   WritePersistent);
			failit = 1;
		}
		if (check_mode(conf, WriteTransient))
			failit = 1;
	} else {
		/* read request */
		if (check_sector(conf, bio->bi_iter.bi_sector,
				 bio_end_sector(bio), READ))
			failit = 1;
		if (check_mode(conf, ReadTransient))
			failit = 1;
		if (check_mode(conf, ReadPersistent)) {
			add_sector(conf, bio->bi_iter.bi_sector,
				   ReadPersistent);
			failit = 1;
		}
		if (check_mode(conf, ReadFixable)) {
			add_sector(conf, bio->bi_iter.bi_sector,
				   ReadFixable);
			failit = 1;
		}
	}
	if (failit) {
		struct bio *b = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);

		bio_set_dev(b, conf->rdev->bdev);
		b->bi_private = bio;
		b->bi_end_io = faulty_fail;
		bio = b;
	} else
		bio_set_dev(bio, conf->rdev->bdev);

	generic_make_request(bio);
	return true;
}

static void faulty_status(struct seq_file *seq, struct mddev *mddev)
{
	struct faulty_conf *conf = mddev->private;
	int n;

	if ((n=atomic_read(&conf->counters[WriteTransient])) != 0)
		seq_printf(seq, " WriteTransient=%d(%d)",
			   n, conf->period[WriteTransient]);

	if ((n=atomic_read(&conf->counters[ReadTransient])) != 0)
		seq_printf(seq, " ReadTransient=%d(%d)",
			   n, conf->period[ReadTransient]);

	if ((n=atomic_read(&conf->counters[WritePersistent])) != 0)
		seq_printf(seq, " WritePersistent=%d(%d)",
			   n, conf->period[WritePersistent]);

	if ((n=atomic_read(&conf->counters[ReadPersistent])) != 0)
		seq_printf(seq, " ReadPersistent=%d(%d)",
			   n, conf->period[ReadPersistent]);


	if ((n=atomic_read(&conf->counters[ReadFixable])) != 0)
		seq_printf(seq, " ReadFixable=%d(%d)",
			   n, conf->period[ReadFixable]);

	if ((n=atomic_read(&conf->counters[WriteAll])) != 0)
		seq_printf(seq, " WriteAll");

	seq_printf(seq, " nfaults=%d", conf->nfaults);
}


static int faulty_reshape(struct mddev *mddev)
{
	int mode = mddev->new_layout & ModeMask;
	int count = mddev->new_layout >> ModeShift;
	struct faulty_conf *conf = mddev->private;

	if (mddev->new_layout < 0)
		return 0;

	/* new layout */
	if (mode == ClearFaults)
		conf->nfaults = 0;
	else if (mode == ClearErrors) {
		int i;
		for (i=0 ; i < Modes ; i++) {
			conf->period[i] = 0;
			atomic_set(&conf->counters[i], 0);
		}
	} else if (mode < Modes) {
		conf->period[mode] = count;
		if (!count) count++;
		atomic_set(&conf->counters[mode], count);
	} else
		return -EINVAL;
	mddev->new_layout = -1;
	mddev->layout = -1; /* makes sure further changes come through */
	return 0;
}

static sector_t faulty_size(struct mddev *mddev, sector_t sectors, int raid_disks)
{
	WARN_ONCE(raid_disks,
		  "%s does not support generic reshape\n", __func__);

	if (sectors == 0)
		return mddev->dev_sectors;

	return sectors;
}

static int faulty_run(struct mddev *mddev)
{
	struct md_rdev *rdev;
	int i;
	struct faulty_conf *conf;

	if (md_check_no_bitmap(mddev))
		return -EINVAL;

	conf = kmalloc(sizeof(*conf), GFP_KERNEL);
	if (!conf)
		return -ENOMEM;

	for (i=0; i<Modes; i++) {
		atomic_set(&conf->counters[i], 0);
		conf->period[i] = 0;
	}
	conf->nfaults = 0;

	rdev_for_each(rdev, mddev) {
		conf->rdev = rdev;
		disk_stack_limits(mddev->gendisk, rdev->bdev,
				  rdev->data_offset << 9);
	}

	md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
	mddev->private = conf;

	faulty_reshape(mddev);

	return 0;
}

static void faulty_free(struct mddev *mddev, void *priv)
{
	struct faulty_conf *conf = priv;

	kfree(conf);
}

static struct md_personality faulty_personality =
{
	.name		= "faulty",
	.level		= LEVEL_FAULTY,
	.owner		= THIS_MODULE,
	.make_request	= faulty_make_request,
	.run		= faulty_run,
	.free		= faulty_free,
	.status		= faulty_status,
	.check_reshape	= faulty_reshape,
	.size		= faulty_size,
};

static int __init raid_init(void)
{
	return register_md_personality(&faulty_personality);
}

static void raid_exit(void)
{
	unregister_md_personality(&faulty_personality);
}

module_init(raid_init);
module_exit(raid_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Fault injection personality for MD");
MODULE_ALIAS("md-personality-10"); /* faulty */
MODULE_ALIAS("md-faulty");
MODULE_ALIAS("md-level--5");
Commit	Line	Data
af1a8899	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* faulty.c : Multiple Devices driver for Linux
	4	*
	5	* Copyright (C) 2004 Neil Brown
	6	*
	7	* fautly-device-simulator personality for md
1da177e4 LT	8	*/
	9
	10
	11	/*
	12	* The "faulty" personality causes some requests to fail.
	13	*
	14	* Possible failure modes are:
	15	* reads fail "randomly" but succeed on retry
	16	* writes fail "randomly" but succeed on retry
	17	* reads for some address fail and then persist until a write
	18	* reads for some address fail and then persist irrespective of write
	19	* writes for some address fail and persist
	20	* all writes fail
	21	*
	22	* Different modes can be active at a time, but only
	23	* one can be set at array creation. Others can be added later.
25985edc	24	* A mode can be one-shot or recurrent with the recurrence being
1da177e4 LT	25	* once in every N requests.
	26	* The bottom 5 bits of the "layout" indicate the mode. The
	27	* remainder indicate a period, or 0 for one-shot.
	28	*
	29	* There is an implementation limit on the number of concurrently
	30	* persisting-faulty blocks. When a new fault is requested that would
	31	* exceed the limit, it is ignored.
	32	* All current faults can be clear using a layout of "0".
	33	*
	34	* Requests are always sent to the device. If they are to fail,
	35	* we clone the bio and insert a new b_end_io into the chain.
	36	*/
	37
	38	#define WriteTransient 0
	39	#define ReadTransient 1
	40	#define WritePersistent 2
	41	#define ReadPersistent 3
	42	#define WriteAll 4 /* doesn't go to device */
	43	#define ReadFixable 5
	44	#define Modes 6
	45
	46	#define ClearErrors 31
	47	#define ClearFaults 30
	48
	49	#define AllPersist 100 /* internal use only */
	50	#define NoPersist 101
	51
	52	#define ModeMask 0x1f
	53	#define ModeShift 5
	54
	55	#define MaxFault 50
bff61975	56	#include <linux/blkdev.h>
056075c7	57	#include <linux/module.h>
bff61975	58	#include <linux/raid/md_u.h>
5a0e3ad6	59	#include <linux/slab.h>
43b2e5d8	60	#include "md.h"
bff61975	61	#include <linux/seq_file.h>
1da177e4 LT	62
1da177e4 LT	63
4246a0b6	64	static void faulty_fail(struct bio *bio)
1da177e4 LT	65	{
	66	struct bio *b = bio->bi_private;
	67
4f024f37 KO	68	b->bi_iter.bi_size = bio->bi_iter.bi_size;
4f024f37 KO	69	b->bi_iter.bi_sector = bio->bi_iter.bi_sector;
1da177e4	70
6712ecf8	71	bio_put(bio);
1da177e4	72
6712ecf8	73	bio_io_error(b);
1da177e4 LT	74	}
1da177e4 LT	75
8f1ae43d	76	struct faulty_conf {
1da177e4 LT	77	int period[Modes];
	78	atomic_t counters[Modes];
	79	sector_t faults[MaxFault];
	80	int modes[MaxFault];
	81	int nfaults;
3cb03002	82	struct md_rdev *rdev;
8f1ae43d	83	};
1da177e4	84
8f1ae43d	85	static int check_mode(struct faulty_conf *conf, int mode)
1da177e4 LT	86	{
	87	if (conf->period[mode] == 0 &&
	88	atomic_read(&conf->counters[mode]) <= 0)
	89	return 0; /* no failure, no decrement */
	90
	91
	92	if (atomic_dec_and_test(&conf->counters[mode])) {
	93	if (conf->period[mode])
	94	atomic_set(&conf->counters[mode], conf->period[mode]);
	95	return 1;
	96	}
	97	return 0;
	98	}
	99
8f1ae43d	100	static int check_sector(struct faulty_conf *conf, sector_t start, sector_t end, int dir)
1da177e4 LT	101	{
	102	/* If we find a ReadFixable sector, we fix it ... */
	103	int i;
	104	for (i=0; i<conf->nfaults; i++)
	105	if (conf->faults[i] >= start &&
	106	conf->faults[i] < end) {
	107	/* found it ... */
	108	switch (conf->modes[i] * 2 + dir) {
	109	case WritePersistent*2+WRITE: return 1;
	110	case ReadPersistent*2+READ: return 1;
	111	case ReadFixable*2+READ: return 1;
	112	case ReadFixable*2+WRITE:
	113	conf->modes[i] = NoPersist;
	114	return 0;
	115	case AllPersist*2+READ:
	116	case AllPersist*2+WRITE: return 1;
	117	default:
	118	return 0;
	119	}
	120	}
	121	return 0;
	122	}
	123
8f1ae43d	124	static void add_sector(struct faulty_conf *conf, sector_t start, int mode)
1da177e4 LT	125	{
	126	int i;
	127	int n = conf->nfaults;
	128	for (i=0; i<conf->nfaults; i++)
	129	if (conf->faults[i] == start) {
	130	switch(mode) {
	131	case NoPersist: conf->modes[i] = mode; return;
	132	case WritePersistent:
	133	if (conf->modes[i] == ReadPersistent \|\|
	134	conf->modes[i] == ReadFixable)
	135	conf->modes[i] = AllPersist;
	136	else
	137	conf->modes[i] = WritePersistent;
	138	return;
	139	case ReadPersistent:
	140	if (conf->modes[i] == WritePersistent)
	141	conf->modes[i] = AllPersist;
	142	else
	143	conf->modes[i] = ReadPersistent;
	144	return;
	145	case ReadFixable:
	146	if (conf->modes[i] == WritePersistent \|\|
	147	conf->modes[i] == ReadPersistent)
	148	conf->modes[i] = AllPersist;
	149	else
	150	conf->modes[i] = ReadFixable;
	151	return;
	152	}
	153	} else if (conf->modes[i] == NoPersist)
	154	n = i;
	155
	156	if (n >= MaxFault)
	157	return;
	158	conf->faults[n] = start;
	159	conf->modes[n] = mode;
	160	if (conf->nfaults == n)
	161	conf->nfaults = n+1;
	162	}
	163
cc27b0c7	164	static bool faulty_make_request(struct mddev mddev, struct bio bio)
1da177e4	165	{
8f1ae43d	166	struct faulty_conf *conf = mddev->private;
1da177e4 LT	167	int failit = 0;
1da177e4 LT	168
802ba064	169	if (bio_data_dir(bio) == WRITE) {
1da177e4 LT	170	/* write request */
	171	if (atomic_read(&conf->counters[WriteAll])) {
	172	/* special case - don't decrement, don't generic_make_request,
	173	* just fail immediately
	174	*/
4246a0b6	175	bio_io_error(bio);
cc27b0c7	176	return true;
1da177e4 LT	177	}
1da177e4 LT	178
4f024f37 KO	179	if (check_sector(conf, bio->bi_iter.bi_sector,
4f024f37 KO	180	bio_end_sector(bio), WRITE))
1da177e4 LT	181	failit = 1;
1da177e4 LT	182	if (check_mode(conf, WritePersistent)) {
4f024f37 KO	183	add_sector(conf, bio->bi_iter.bi_sector,
4f024f37 KO	184	WritePersistent);
1da177e4 LT	185	failit = 1;
	186	}
	187	if (check_mode(conf, WriteTransient))
	188	failit = 1;
	189	} else {
	190	/* read request */
4f024f37 KO	191	if (check_sector(conf, bio->bi_iter.bi_sector,
4f024f37 KO	192	bio_end_sector(bio), READ))
1da177e4 LT	193	failit = 1;
	194	if (check_mode(conf, ReadTransient))
	195	failit = 1;
	196	if (check_mode(conf, ReadPersistent)) {
4f024f37 KO	197	add_sector(conf, bio->bi_iter.bi_sector,
4f024f37 KO	198	ReadPersistent);
1da177e4 LT	199	failit = 1;
	200	}
	201	if (check_mode(conf, ReadFixable)) {
4f024f37 KO	202	add_sector(conf, bio->bi_iter.bi_sector,
4f024f37 KO	203	ReadFixable);
1da177e4 LT	204	failit = 1;
	205	}
	206	}
	207	if (failit) {
afeee514	208	struct bio *b = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
5a7bbad2	209
74d46992	210	bio_set_dev(b, conf->rdev->bdev);
1da177e4 LT	211	b->bi_private = bio;
1da177e4 LT	212	b->bi_end_io = faulty_fail;
5a7bbad2 CH	213	bio = b;
5a7bbad2 CH	214	} else
74d46992	215	bio_set_dev(bio, conf->rdev->bdev);
5a7bbad2 CH	216
5a7bbad2 CH	217	generic_make_request(bio);
cc27b0c7	218	return true;
1da177e4 LT	219	}
1da177e4 LT	220
849674e4	221	static void faulty_status(struct seq_file seq, struct mddev mddev)
1da177e4	222	{
8f1ae43d	223	struct faulty_conf *conf = mddev->private;
1da177e4 LT	224	int n;
	225
	226	if ((n=atomic_read(&conf->counters[WriteTransient])) != 0)
	227	seq_printf(seq, " WriteTransient=%d(%d)",
	228	n, conf->period[WriteTransient]);
	229
	230	if ((n=atomic_read(&conf->counters[ReadTransient])) != 0)
	231	seq_printf(seq, " ReadTransient=%d(%d)",
	232	n, conf->period[ReadTransient]);
	233
	234	if ((n=atomic_read(&conf->counters[WritePersistent])) != 0)
	235	seq_printf(seq, " WritePersistent=%d(%d)",
	236	n, conf->period[WritePersistent]);
	237
	238	if ((n=atomic_read(&conf->counters[ReadPersistent])) != 0)
	239	seq_printf(seq, " ReadPersistent=%d(%d)",
	240	n, conf->period[ReadPersistent]);
	241
	242
	243	if ((n=atomic_read(&conf->counters[ReadFixable])) != 0)
	244	seq_printf(seq, " ReadFixable=%d(%d)",
	245	n, conf->period[ReadFixable]);
	246
	247	if ((n=atomic_read(&conf->counters[WriteAll])) != 0)
	248	seq_printf(seq, " WriteAll");
	249
	250	seq_printf(seq, " nfaults=%d", conf->nfaults);
	251	}
	252
	253
849674e4	254	static int faulty_reshape(struct mddev *mddev)
1da177e4	255	{
597a711b N	256	int mode = mddev->new_layout & ModeMask;
597a711b N	257	int count = mddev->new_layout >> ModeShift;
8f1ae43d	258	struct faulty_conf *conf = mddev->private;
1da177e4	259
597a711b N	260	if (mddev->new_layout < 0)
597a711b N	261	return 0;
1da177e4 LT	262
	263	/* new layout */
	264	if (mode == ClearFaults)
	265	conf->nfaults = 0;
	266	else if (mode == ClearErrors) {
	267	int i;
	268	for (i=0 ; i < Modes ; i++) {
	269	conf->period[i] = 0;
	270	atomic_set(&conf->counters[i], 0);
	271	}
	272	} else if (mode < Modes) {
	273	conf->period[mode] = count;
	274	if (!count) count++;
	275	atomic_set(&conf->counters[mode], count);
	276	} else
	277	return -EINVAL;
597a711b	278	mddev->new_layout = -1;
1da177e4 LT	279	mddev->layout = -1; /* makes sure further changes come through */
	280	return 0;
	281	}
	282
fd01b88c	283	static sector_t faulty_size(struct mddev *mddev, sector_t sectors, int raid_disks)
80c3a6ce DW	284	{
	285	WARN_ONCE(raid_disks,
	286	"%s does not support generic reshape\n", __func__);
	287
	288	if (sectors == 0)
	289	return mddev->dev_sectors;
	290
	291	return sectors;
	292	}
	293
849674e4	294	static int faulty_run(struct mddev *mddev)
1da177e4	295	{
3cb03002	296	struct md_rdev *rdev;
1da177e4	297	int i;
8f1ae43d	298	struct faulty_conf *conf;
1da177e4	299
0894cc30 AN	300	if (md_check_no_bitmap(mddev))
	301	return -EINVAL;
	302
	303	conf = kmalloc(sizeof(*conf), GFP_KERNEL);
08ff39f1 SW	304	if (!conf)
08ff39f1 SW	305	return -ENOMEM;
1da177e4 LT	306
	307	for (i=0; i<Modes; i++) {
	308	atomic_set(&conf->counters[i], 0);
	309	conf->period[i] = 0;
	310	}
	311	conf->nfaults = 0;
	312
0be1fecd	313	rdev_for_each(rdev, mddev) {
1da177e4	314	conf->rdev = rdev;
0be1fecd ES	315	disk_stack_limits(mddev->gendisk, rdev->bdev,
	316	rdev->data_offset << 9);
	317	}
1da177e4	318
1f403624	319	md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
1da177e4 LT	320	mddev->private = conf;
1da177e4 LT	321
849674e4	322	faulty_reshape(mddev);
1da177e4 LT	323
	324	return 0;
	325	}
	326
afa0f557	327	static void faulty_free(struct mddev mddev, void priv)
1da177e4	328	{
afa0f557	329	struct faulty_conf *conf = priv;
1da177e4 LT	330
1da177e4 LT	331	kfree(conf);
1da177e4 LT	332	}
1da177e4 LT	333
84fc4b56	334	static struct md_personality faulty_personality =
1da177e4 LT	335	{
1da177e4 LT	336	.name = "faulty",
2604b703	337	.level = LEVEL_FAULTY,
1da177e4	338	.owner = THIS_MODULE,
849674e4 SL	339	.make_request = faulty_make_request,
849674e4 SL	340	.run = faulty_run,
afa0f557	341	.free = faulty_free,
849674e4 SL	342	.status = faulty_status,
849674e4 SL	343	.check_reshape = faulty_reshape,
80c3a6ce	344	.size = faulty_size,
1da177e4 LT	345	};
	346
	347	static int __init raid_init(void)
	348	{
2604b703	349	return register_md_personality(&faulty_personality);
1da177e4 LT	350	}
	351
	352	static void raid_exit(void)
	353	{
2604b703	354	unregister_md_personality(&faulty_personality);
1da177e4 LT	355	}
	356
	357	module_init(raid_init);
	358	module_exit(raid_exit);
	359	MODULE_LICENSE("GPL");
0efb9e61	360	MODULE_DESCRIPTION("Fault injection personality for MD");
1da177e4	361	MODULE_ALIAS("md-personality-10"); /* faulty */
d9d166c2	362	MODULE_ALIAS("md-faulty");
2604b703	363	MODULE_ALIAS("md-level--5");