Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1297 deletions

diff --git a/ANDROID_3.4.5/drivers/md/dm-raid.c b/ANDROID_3.4.5/drivers/md/dm-raid.c
deleted file mode 100644
index 68965e66..00000000
--- a/ANDROID_3.4.5/drivers/md/dm-raid.c
+++ /dev/null
@@ -1,1297 +0,0 @@
-/*
- * Copyright (C) 2010-2011 Neil Brown
- * Copyright (C) 2010-2011 Red Hat, Inc. All rights reserved.
- *
- * This file is released under the GPL.
- */
-
-#include <linux/slab.h>
-#include <linux/module.h>
-
-#include "md.h"
-#include "raid1.h"
-#include "raid5.h"
-#include "bitmap.h"
-
-#include <linux/device-mapper.h>
-
-#define DM_MSG_PREFIX "raid"
-
-/*
- * The following flags are used by dm-raid.c to set up the array state.
- * They must be cleared before md_run is called.
- */
-#define FirstUse 10             /* rdev flag */
-
-struct raid_dev {
-	/*
-	 * Two DM devices, one to hold metadata and one to hold the
-	 * actual data/parity.  The reason for this is to not confuse
-	 * ti->len and give more flexibility in altering size and
-	 * characteristics.
-	 *
-	 * While it is possible for this device to be associated
-	 * with a different physical device than the data_dev, it
-	 * is intended for it to be the same.
-	 *    |--------- Physical Device ---------|
-	 *    |- meta_dev -|------ data_dev ------|
-	 */
-	struct dm_dev *meta_dev;
-	struct dm_dev *data_dev;
-	struct md_rdev rdev;
-};
-
-/*
- * Flags for rs->print_flags field.
- */
-#define DMPF_SYNC              0x1
-#define DMPF_NOSYNC            0x2
-#define DMPF_REBUILD           0x4
-#define DMPF_DAEMON_SLEEP      0x8
-#define DMPF_MIN_RECOVERY_RATE 0x10
-#define DMPF_MAX_RECOVERY_RATE 0x20
-#define DMPF_MAX_WRITE_BEHIND  0x40
-#define DMPF_STRIPE_CACHE      0x80
-#define DMPF_REGION_SIZE       0X100
-struct raid_set {
-	struct dm_target *ti;
-
-	uint32_t bitmap_loaded;
-	uint32_t print_flags;
-
-	struct mddev md;
-	struct raid_type *raid_type;
-	struct dm_target_callbacks callbacks;
-
-	struct raid_dev dev[0];
-};
-
-/* Supported raid types and properties. */
-static struct raid_type {
-	const char *name;		/* RAID algorithm. */
-	const char *descr;		/* Descriptor text for logging. */
-	const unsigned parity_devs;	/* # of parity devices. */
-	const unsigned minimal_devs;	/* minimal # of devices in set. */
-	const unsigned level;		/* RAID level. */
-	const unsigned algorithm;	/* RAID algorithm. */
-} raid_types[] = {
-	{"raid1",    "RAID1 (mirroring)",               0, 2, 1, 0 /* NONE */},
-	{"raid4",    "RAID4 (dedicated parity disk)",	1, 2, 5, ALGORITHM_PARITY_0},
-	{"raid5_la", "RAID5 (left asymmetric)",		1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
-	{"raid5_ra", "RAID5 (right asymmetric)",	1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
-	{"raid5_ls", "RAID5 (left symmetric)",		1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
-	{"raid5_rs", "RAID5 (right symmetric)",		1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
-	{"raid6_zr", "RAID6 (zero restart)",		2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
-	{"raid6_nr", "RAID6 (N restart)",		2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
-	{"raid6_nc", "RAID6 (N continue)",		2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE}
-};
-
-static struct raid_type *get_raid_type(char *name)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(raid_types); i++)
-		if (!strcmp(raid_types[i].name, name))
-			return &raid_types[i];
-
-	return NULL;
-}
-
-static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs)
-{
-	unsigned i;
-	struct raid_set *rs;
-	sector_t sectors_per_dev;
-
-	if (raid_devs <= raid_type->parity_devs) {
-		ti->error = "Insufficient number of devices";
-		return ERR_PTR(-EINVAL);
-	}
-
-	sectors_per_dev = ti->len;
-	if ((raid_type->level > 1) &&
-	    sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
-		ti->error = "Target length not divisible by number of data devices";
-		return ERR_PTR(-EINVAL);
-	}
-
-	rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
-	if (!rs) {
-		ti->error = "Cannot allocate raid context";
-		return ERR_PTR(-ENOMEM);
-	}
-
-	mddev_init(&rs->md);
-
-	rs->ti = ti;
-	rs->raid_type = raid_type;
-	rs->md.raid_disks = raid_devs;
-	rs->md.level = raid_type->level;
-	rs->md.new_level = rs->md.level;
-	rs->md.dev_sectors = sectors_per_dev;
-	rs->md.layout = raid_type->algorithm;
-	rs->md.new_layout = rs->md.layout;
-	rs->md.delta_disks = 0;
-	rs->md.recovery_cp = 0;
-
-	for (i = 0; i < raid_devs; i++)
-		md_rdev_init(&rs->dev[i].rdev);
-
-	/*
-	 * Remaining items to be initialized by further RAID params:
-	 *  rs->md.persistent
-	 *  rs->md.external
-	 *  rs->md.chunk_sectors
-	 *  rs->md.new_chunk_sectors
-	 */
-
-	return rs;
-}
-
-static void context_free(struct raid_set *rs)
-{
-	int i;
-
-	for (i = 0; i < rs->md.raid_disks; i++) {
-		if (rs->dev[i].meta_dev)
-			dm_put_device(rs->ti, rs->dev[i].meta_dev);
-		if (rs->dev[i].rdev.sb_page)
-			put_page(rs->dev[i].rdev.sb_page);
-		rs->dev[i].rdev.sb_page = NULL;
-		rs->dev[i].rdev.sb_loaded = 0;
-		if (rs->dev[i].data_dev)
-			dm_put_device(rs->ti, rs->dev[i].data_dev);
-	}
-
-	kfree(rs);
-}
-
-/*
- * For every device we have two words
- *  <meta_dev>: meta device name or '-' if missing
- *  <data_dev>: data device name or '-' if missing
- *
- * The following are permitted:
- *    - -
- *    - <data_dev>
- *    <meta_dev> <data_dev>
- *
- * The following is not allowed:
- *    <meta_dev> -
- *
- * This code parses those words.  If there is a failure,
- * the caller must use context_free to unwind the operations.
- */
-static int dev_parms(struct raid_set *rs, char **argv)
-{
-	int i;
-	int rebuild = 0;
-	int metadata_available = 0;
-	int ret = 0;
-
-	for (i = 0; i < rs->md.raid_disks; i++, argv += 2) {
-		rs->dev[i].rdev.raid_disk = i;
-
-		rs->dev[i].meta_dev = NULL;
-		rs->dev[i].data_dev = NULL;
-
-		/*
-		 * There are no offsets, since there is a separate device
-		 * for data and metadata.
-		 */
-		rs->dev[i].rdev.data_offset = 0;
-		rs->dev[i].rdev.mddev = &rs->md;
-
-		if (strcmp(argv[0], "-")) {
-			ret = dm_get_device(rs->ti, argv[0],
-					    dm_table_get_mode(rs->ti->table),
-					    &rs->dev[i].meta_dev);
-			rs->ti->error = "RAID metadata device lookup failure";
-			if (ret)
-				return ret;
-
-			rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
-			if (!rs->dev[i].rdev.sb_page)
-				return -ENOMEM;
-		}
-
-		if (!strcmp(argv[1], "-")) {
-			if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
-			    (!rs->dev[i].rdev.recovery_offset)) {
-				rs->ti->error = "Drive designated for rebuild not specified";
-				return -EINVAL;
-			}
-
-			rs->ti->error = "No data device supplied with metadata device";
-			if (rs->dev[i].meta_dev)
-				return -EINVAL;
-
-			continue;
-		}
-
-		ret = dm_get_device(rs->ti, argv[1],
-				    dm_table_get_mode(rs->ti->table),
-				    &rs->dev[i].data_dev);
-		if (ret) {
-			rs->ti->error = "RAID device lookup failure";
-			return ret;
-		}
-
-		if (rs->dev[i].meta_dev) {
-			metadata_available = 1;
-			rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
-		}
-		rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
-		list_add(&rs->dev[i].rdev.same_set, &rs->md.disks);
-		if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
-			rebuild++;
-	}
-
-	if (metadata_available) {
-		rs->md.external = 0;
-		rs->md.persistent = 1;
-		rs->md.major_version = 2;
-	} else if (rebuild && !rs->md.recovery_cp) {
-		/*
-		 * Without metadata, we will not be able to tell if the array
-		 * is in-sync or not - we must assume it is not.  Therefore,
-		 * it is impossible to rebuild a drive.
-		 *
-		 * Even if there is metadata, the on-disk information may
-		 * indicate that the array is not in-sync and it will then
-		 * fail at that time.
-		 *
-		 * User could specify 'nosync' option if desperate.
-		 */
-		DMERR("Unable to rebuild drive while array is not in-sync");
-		rs->ti->error = "RAID device lookup failure";
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/*
- * validate_region_size
- * @rs
- * @region_size:  region size in sectors.  If 0, pick a size (4MiB default).
- *
- * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
- * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
- *
- * Returns: 0 on success, -EINVAL on failure.
- */
-static int validate_region_size(struct raid_set *rs, unsigned long region_size)
-{
-	unsigned long min_region_size = rs->ti->len / (1 << 21);
-
-	if (!region_size) {
-		/*
-		 * Choose a reasonable default.  All figures in sectors.
-		 */
-		if (min_region_size > (1 << 13)) {
-			DMINFO("Choosing default region size of %lu sectors",
-			       region_size);
-			region_size = min_region_size;
-		} else {
-			DMINFO("Choosing default region size of 4MiB");
-			region_size = 1 << 13; /* sectors */
-		}
-	} else {
-		/*
-		 * Validate user-supplied value.
-		 */
-		if (region_size > rs->ti->len) {
-			rs->ti->error = "Supplied region size is too large";
-			return -EINVAL;
-		}
-
-		if (region_size < min_region_size) {
-			DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
-			      region_size, min_region_size);
-			rs->ti->error = "Supplied region size is too small";
-			return -EINVAL;
-		}
-
-		if (!is_power_of_2(region_size)) {
-			rs->ti->error = "Region size is not a power of 2";
-			return -EINVAL;
-		}
-
-		if (region_size < rs->md.chunk_sectors) {
-			rs->ti->error = "Region size is smaller than the chunk size";
-			return -EINVAL;
-		}
-	}
-
-	/*
-	 * Convert sectors to bytes.
-	 */
-	rs->md.bitmap_info.chunksize = (region_size << 9);
-
-	return 0;
-}
-
-/*
- * Possible arguments are...
- *	<chunk_size> [optional_args]
- *
- * Argument definitions
- *    <chunk_size>			The number of sectors per disk that
- *                                      will form the "stripe"
- *    [[no]sync]			Force or prevent recovery of the
- *                                      entire array
- *    [rebuild <idx>]			Rebuild the drive indicated by the index
- *    [daemon_sleep <ms>]		Time between bitmap daemon work to
- *                                      clear bits
- *    [min_recovery_rate <kB/sec/disk>]	Throttle RAID initialization
- *    [max_recovery_rate <kB/sec/disk>]	Throttle RAID initialization
- *    [write_mostly <idx>]		Indicate a write mostly drive via index
- *    [max_write_behind <sectors>]	See '-write-behind=' (man mdadm)
- *    [stripe_cache <sectors>]		Stripe cache size for higher RAIDs
- *    [region_size <sectors>]           Defines granularity of bitmap
- */
-static int parse_raid_params(struct raid_set *rs, char **argv,
-			     unsigned num_raid_params)
-{
-	unsigned i, rebuild_cnt = 0;
-	unsigned long value, region_size = 0;
-	char *key;
-
-	/*
-	 * First, parse the in-order required arguments
-	 * "chunk_size" is the only argument of this type.
-	 */
-	if ((strict_strtoul(argv[0], 10, &value) < 0)) {
-		rs->ti->error = "Bad chunk size";
-		return -EINVAL;
-	} else if (rs->raid_type->level == 1) {
-		if (value)
-			DMERR("Ignoring chunk size parameter for RAID 1");
-		value = 0;
-	} else if (!is_power_of_2(value)) {
-		rs->ti->error = "Chunk size must be a power of 2";
-		return -EINVAL;
-	} else if (value < 8) {
-		rs->ti->error = "Chunk size value is too small";
-		return -EINVAL;
-	}
-
-	rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
-	argv++;
-	num_raid_params--;
-
-	/*
-	 * We set each individual device as In_sync with a completed
-	 * 'recovery_offset'.  If there has been a device failure or
-	 * replacement then one of the following cases applies:
-	 *
-	 *   1) User specifies 'rebuild'.
-	 *      - Device is reset when param is read.
-	 *   2) A new device is supplied.
-	 *      - No matching superblock found, resets device.
-	 *   3) Device failure was transient and returns on reload.
-	 *      - Failure noticed, resets device for bitmap replay.
-	 *   4) Device hadn't completed recovery after previous failure.
-	 *      - Superblock is read and overrides recovery_offset.
-	 *
-	 * What is found in the superblocks of the devices is always
-	 * authoritative, unless 'rebuild' or '[no]sync' was specified.
-	 */
-	for (i = 0; i < rs->md.raid_disks; i++) {
-		set_bit(In_sync, &rs->dev[i].rdev.flags);
-		rs->dev[i].rdev.recovery_offset = MaxSector;
-	}
-
-	/*
-	 * Second, parse the unordered optional arguments
-	 */
-	for (i = 0; i < num_raid_params; i++) {
-		if (!strcasecmp(argv[i], "nosync")) {
-			rs->md.recovery_cp = MaxSector;
-			rs->print_flags |= DMPF_NOSYNC;
-			continue;
-		}
-		if (!strcasecmp(argv[i], "sync")) {
-			rs->md.recovery_cp = 0;
-			rs->print_flags |= DMPF_SYNC;
-			continue;
-		}
-
-		/* The rest of the optional arguments come in key/value pairs */
-		if ((i + 1) >= num_raid_params) {
-			rs->ti->error = "Wrong number of raid parameters given";
-			return -EINVAL;
-		}
-
-		key = argv[i++];
-		if (strict_strtoul(argv[i], 10, &value) < 0) {
-			rs->ti->error = "Bad numerical argument given in raid params";
-			return -EINVAL;
-		}
-
-		if (!strcasecmp(key, "rebuild")) {
-			rebuild_cnt++;
-			if (((rs->raid_type->level != 1) &&
-			     (rebuild_cnt > rs->raid_type->parity_devs)) ||
-			    ((rs->raid_type->level == 1) &&
-			     (rebuild_cnt > (rs->md.raid_disks - 1)))) {
-				rs->ti->error = "Too many rebuild devices specified for given RAID type";
-				return -EINVAL;
-			}
-			if (value > rs->md.raid_disks) {
-				rs->ti->error = "Invalid rebuild index given";
-				return -EINVAL;
-			}
-			clear_bit(In_sync, &rs->dev[value].rdev.flags);
-			rs->dev[value].rdev.recovery_offset = 0;
-			rs->print_flags |= DMPF_REBUILD;
-		} else if (!strcasecmp(key, "write_mostly")) {
-			if (rs->raid_type->level != 1) {
-				rs->ti->error = "write_mostly option is only valid for RAID1";
-				return -EINVAL;
-			}
-			if (value >= rs->md.raid_disks) {
-				rs->ti->error = "Invalid write_mostly drive index given";
-				return -EINVAL;
-			}
-			set_bit(WriteMostly, &rs->dev[value].rdev.flags);
-		} else if (!strcasecmp(key, "max_write_behind")) {
-			if (rs->raid_type->level != 1) {
-				rs->ti->error = "max_write_behind option is only valid for RAID1";
-				return -EINVAL;
-			}
-			rs->print_flags |= DMPF_MAX_WRITE_BEHIND;
-
-			/*
-			 * In device-mapper, we specify things in sectors, but
-			 * MD records this value in kB
-			 */
-			value /= 2;
-			if (value > COUNTER_MAX) {
-				rs->ti->error = "Max write-behind limit out of range";
-				return -EINVAL;
-			}
-			rs->md.bitmap_info.max_write_behind = value;
-		} else if (!strcasecmp(key, "daemon_sleep")) {
-			rs->print_flags |= DMPF_DAEMON_SLEEP;
-			if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
-				rs->ti->error = "daemon sleep period out of range";
-				return -EINVAL;
-			}
-			rs->md.bitmap_info.daemon_sleep = value;
-		} else if (!strcasecmp(key, "stripe_cache")) {
-			rs->print_flags |= DMPF_STRIPE_CACHE;
-
-			/*
-			 * In device-mapper, we specify things in sectors, but
-			 * MD records this value in kB
-			 */
-			value /= 2;
-
-			if (rs->raid_type->level < 5) {
-				rs->ti->error = "Inappropriate argument: stripe_cache";
-				return -EINVAL;
-			}
-			if (raid5_set_cache_size(&rs->md, (int)value)) {
-				rs->ti->error = "Bad stripe_cache size";
-				return -EINVAL;
-			}
-		} else if (!strcasecmp(key, "min_recovery_rate")) {
-			rs->print_flags |= DMPF_MIN_RECOVERY_RATE;
-			if (value > INT_MAX) {
-				rs->ti->error = "min_recovery_rate out of range";
-				return -EINVAL;
-			}
-			rs->md.sync_speed_min = (int)value;
-		} else if (!strcasecmp(key, "max_recovery_rate")) {
-			rs->print_flags |= DMPF_MAX_RECOVERY_RATE;
-			if (value > INT_MAX) {
-				rs->ti->error = "max_recovery_rate out of range";
-				return -EINVAL;
-			}
-			rs->md.sync_speed_max = (int)value;
-		} else if (!strcasecmp(key, "region_size")) {
-			rs->print_flags |= DMPF_REGION_SIZE;
-			region_size = value;
-		} else {
-			DMERR("Unable to parse RAID parameter: %s", key);
-			rs->ti->error = "Unable to parse RAID parameters";
-			return -EINVAL;
-		}
-	}
-
-	if (validate_region_size(rs, region_size))
-		return -EINVAL;
-
-	if (rs->md.chunk_sectors)
-		rs->ti->split_io = rs->md.chunk_sectors;
-	else
-		rs->ti->split_io = region_size;
-
-	if (rs->md.chunk_sectors)
-		rs->ti->split_io = rs->md.chunk_sectors;
-	else
-		rs->ti->split_io = region_size;
-
-	/* Assume there are no metadata devices until the drives are parsed */
-	rs->md.persistent = 0;
-	rs->md.external = 1;
-
-	return 0;
-}
-
-static void do_table_event(struct work_struct *ws)
-{
-	struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
-
-	dm_table_event(rs->ti->table);
-}
-
-static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
-{
-	struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
-
-	if (rs->raid_type->level == 1)
-		return md_raid1_congested(&rs->md, bits);
-
-	return md_raid5_congested(&rs->md, bits);
-}
-
-/*
- * This structure is never routinely used by userspace, unlike md superblocks.
- * Devices with this superblock should only ever be accessed via device-mapper.
- */
-#define DM_RAID_MAGIC 0x64526D44
-struct dm_raid_superblock {
-	__le32 magic;		/* "DmRd" */
-	__le32 features;	/* Used to indicate possible future changes */
-
-	__le32 num_devices;	/* Number of devices in this array. (Max 64) */
-	__le32 array_position;	/* The position of this drive in the array */
-
-	__le64 events;		/* Incremented by md when superblock updated */
-	__le64 failed_devices;	/* Bit field of devices to indicate failures */
-
-	/*
-	 * This offset tracks the progress of the repair or replacement of
-	 * an individual drive.
-	 */
-	__le64 disk_recovery_offset;
-
-	/*
-	 * This offset tracks the progress of the initial array
-	 * synchronisation/parity calculation.
-	 */
-	__le64 array_resync_offset;
-
-	/*
-	 * RAID characteristics
-	 */
-	__le32 level;
-	__le32 layout;
-	__le32 stripe_sectors;
-
-	__u8 pad[452];		/* Round struct to 512 bytes. */
-				/* Always set to 0 when writing. */
-} __packed;
-
-static int read_disk_sb(struct md_rdev *rdev, int size)
-{
-	BUG_ON(!rdev->sb_page);
-
-	if (rdev->sb_loaded)
-		return 0;
-
-	if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) {
-		DMERR("Failed to read superblock of device at position %d",
-		      rdev->raid_disk);
-		set_bit(Faulty, &rdev->flags);
-		return -EINVAL;
-	}
-
-	rdev->sb_loaded = 1;
-
-	return 0;
-}
-
-static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
-{
-	struct md_rdev *r;
-	uint64_t failed_devices;
-	struct dm_raid_superblock *sb;
-
-	sb = page_address(rdev->sb_page);
-	failed_devices = le64_to_cpu(sb->failed_devices);
-
-	rdev_for_each(r, mddev)
-		if ((r->raid_disk >= 0) && test_bit(Faulty, &r->flags))
-			failed_devices |= (1ULL << r->raid_disk);
-
-	memset(sb, 0, sizeof(*sb));
-
-	sb->magic = cpu_to_le32(DM_RAID_MAGIC);
-	sb->features = cpu_to_le32(0);	/* No features yet */
-
-	sb->num_devices = cpu_to_le32(mddev->raid_disks);
-	sb->array_position = cpu_to_le32(rdev->raid_disk);
-
-	sb->events = cpu_to_le64(mddev->events);
-	sb->failed_devices = cpu_to_le64(failed_devices);
-
-	sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
-	sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
-
-	sb->level = cpu_to_le32(mddev->level);
-	sb->layout = cpu_to_le32(mddev->layout);
-	sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
-}
-
-/*
- * super_load
- *
- * This function creates a superblock if one is not found on the device
- * and will decide which superblock to use if there's a choice.
- *
- * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
- */
-static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
-{
-	int ret;
-	struct dm_raid_superblock *sb;
-	struct dm_raid_superblock *refsb;
-	uint64_t events_sb, events_refsb;
-
-	rdev->sb_start = 0;
-	rdev->sb_size = sizeof(*sb);
-
-	ret = read_disk_sb(rdev, rdev->sb_size);
-	if (ret)
-		return ret;
-
-	sb = page_address(rdev->sb_page);
-
-	/*
-	 * Two cases that we want to write new superblocks and rebuild:
-	 * 1) New device (no matching magic number)
-	 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
-	 */
-	if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
-	    (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
-		super_sync(rdev->mddev, rdev);
-
-		set_bit(FirstUse, &rdev->flags);
-
-		/* Force writing of superblocks to disk */
-		set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
-
-		/* Any superblock is better than none, choose that if given */
-		return refdev ? 0 : 1;
-	}
-
-	if (!refdev)
-		return 1;
-
-	events_sb = le64_to_cpu(sb->events);
-
-	refsb = page_address(refdev->sb_page);
-	events_refsb = le64_to_cpu(refsb->events);
-
-	return (events_sb > events_refsb) ? 1 : 0;
-}
-
-static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev)
-{
-	int role;
-	struct raid_set *rs = container_of(mddev, struct raid_set, md);
-	uint64_t events_sb;
-	uint64_t failed_devices;
-	struct dm_raid_superblock *sb;
-	uint32_t new_devs = 0;
-	uint32_t rebuilds = 0;
-	struct md_rdev *r;
-	struct dm_raid_superblock *sb2;
-
-	sb = page_address(rdev->sb_page);
-	events_sb = le64_to_cpu(sb->events);
-	failed_devices = le64_to_cpu(sb->failed_devices);
-
-	/*
-	 * Initialise to 1 if this is a new superblock.
-	 */
-	mddev->events = events_sb ? : 1;
-
-	/*
-	 * Reshaping is not currently allowed
-	 */
-	if ((le32_to_cpu(sb->level) != mddev->level) ||
-	    (le32_to_cpu(sb->layout) != mddev->layout) ||
-	    (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors)) {
-		DMERR("Reshaping arrays not yet supported.");
-		return -EINVAL;
-	}
-
-	/* We can only change the number of devices in RAID1 right now */
-	if ((rs->raid_type->level != 1) &&
-	    (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
-		DMERR("Reshaping arrays not yet supported.");
-		return -EINVAL;
-	}
-
-	if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)))
-		mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
-
-	/*
-	 * During load, we set FirstUse if a new superblock was written.
-	 * There are two reasons we might not have a superblock:
-	 * 1) The array is brand new - in which case, all of the
-	 *    devices must have their In_sync bit set.  Also,
-	 *    recovery_cp must be 0, unless forced.
-	 * 2) This is a new device being added to an old array
-	 *    and the new device needs to be rebuilt - in which
-	 *    case the In_sync bit will /not/ be set and
-	 *    recovery_cp must be MaxSector.
-	 */
-	rdev_for_each(r, mddev) {
-		if (!test_bit(In_sync, &r->flags)) {
-			DMINFO("Device %d specified for rebuild: "
-			       "Clearing superblock", r->raid_disk);
-			rebuilds++;
-		} else if (test_bit(FirstUse, &r->flags))
-			new_devs++;
-	}
-
-	if (!rebuilds) {
-		if (new_devs == mddev->raid_disks) {
-			DMINFO("Superblocks created for new array");
-			set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
-		} else if (new_devs) {
-			DMERR("New device injected "
-			      "into existing array without 'rebuild' "
-			      "parameter specified");
-			return -EINVAL;
-		}
-	} else if (new_devs) {
-		DMERR("'rebuild' devices cannot be "
-		      "injected into an array with other first-time devices");
-		return -EINVAL;
-	} else if (mddev->recovery_cp != MaxSector) {
-		DMERR("'rebuild' specified while array is not in-sync");
-		return -EINVAL;
-	}
-
-	/*
-	 * Now we set the Faulty bit for those devices that are
-	 * recorded in the superblock as failed.
-	 */
-	rdev_for_each(r, mddev) {
-		if (!r->sb_page)
-			continue;
-		sb2 = page_address(r->sb_page);
-		sb2->failed_devices = 0;
-
-		/*
-		 * Check for any device re-ordering.
-		 */
-		if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
-			role = le32_to_cpu(sb2->array_position);
-			if (role != r->raid_disk) {
-				if (rs->raid_type->level != 1) {
-					rs->ti->error = "Cannot change device "
-						"positions in RAID array";
-					return -EINVAL;
-				}
-				DMINFO("RAID1 device #%d now at position #%d",
-				       role, r->raid_disk);
-			}
-
-			/*
-			 * Partial recovery is performed on
-			 * returning failed devices.
-			 */
-			if (failed_devices & (1 << role))
-				set_bit(Faulty, &r->flags);
-		}
-	}
-
-	return 0;
-}
-
-static int super_validate(struct mddev *mddev, struct md_rdev *rdev)
-{
-	struct dm_raid_superblock *sb = page_address(rdev->sb_page);
-
-	/*
-	 * If mddev->events is not set, we know we have not yet initialized
-	 * the array.
-	 */
-	if (!mddev->events && super_init_validation(mddev, rdev))
-		return -EINVAL;
-
-	mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */
-	rdev->mddev->bitmap_info.default_offset = 4096 >> 9;
-	if (!test_bit(FirstUse, &rdev->flags)) {
-		rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
-		if (rdev->recovery_offset != MaxSector)
-			clear_bit(In_sync, &rdev->flags);
-	}
-
-	/*
-	 * If a device comes back, set it as not In_sync and no longer faulty.
-	 */
-	if (test_bit(Faulty, &rdev->flags)) {
-		clear_bit(Faulty, &rdev->flags);
-		clear_bit(In_sync, &rdev->flags);
-		rdev->saved_raid_disk = rdev->raid_disk;
-		rdev->recovery_offset = 0;
-	}
-
-	clear_bit(FirstUse, &rdev->flags);
-
-	return 0;
-}
-
-/*
- * Analyse superblocks and select the freshest.
- */
-static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
-{
-	int ret;
-	unsigned redundancy = 0;
-	struct raid_dev *dev;
-	struct md_rdev *rdev, *tmp, *freshest;
-	struct mddev *mddev = &rs->md;
-
-	switch (rs->raid_type->level) {
-	case 1:
-		redundancy = rs->md.raid_disks - 1;
-		break;
-	case 4:
-	case 5:
-	case 6:
-		redundancy = rs->raid_type->parity_devs;
-		break;
-	default:
-		ti->error = "Unknown RAID type";
-		return -EINVAL;
-	}
-
-	freshest = NULL;
-	rdev_for_each_safe(rdev, tmp, mddev) {
-		if (!rdev->meta_bdev)
-			continue;
-
-		ret = super_load(rdev, freshest);
-
-		switch (ret) {
-		case 1:
-			freshest = rdev;
-			break;
-		case 0:
-			break;
-		default:
-			dev = container_of(rdev, struct raid_dev, rdev);
-			if (redundancy--) {
-				if (dev->meta_dev)
-					dm_put_device(ti, dev->meta_dev);
-
-				dev->meta_dev = NULL;
-				rdev->meta_bdev = NULL;
-
-				if (rdev->sb_page)
-					put_page(rdev->sb_page);
-
-				rdev->sb_page = NULL;
-
-				rdev->sb_loaded = 0;
-
-				/*
-				 * We might be able to salvage the data device
-				 * even though the meta device has failed.  For
-				 * now, we behave as though '- -' had been
-				 * set for this device in the table.
-				 */
-				if (dev->data_dev)
-					dm_put_device(ti, dev->data_dev);
-
-				dev->data_dev = NULL;
-				rdev->bdev = NULL;
-
-				list_del(&rdev->same_set);
-
-				continue;
-			}
-			ti->error = "Failed to load superblock";
-			return ret;
-		}
-	}
-
-	if (!freshest)
-		return 0;
-
-	/*
-	 * Validation of the freshest device provides the source of
-	 * validation for the remaining devices.
-	 */
-	ti->error = "Unable to assemble array: Invalid superblocks";
-	if (super_validate(mddev, freshest))
-		return -EINVAL;
-
-	rdev_for_each(rdev, mddev)
-		if ((rdev != freshest) && super_validate(mddev, rdev))
-			return -EINVAL;
-
-	return 0;
-}
-
-/*
- * Construct a RAID4/5/6 mapping:
- * Args:
- *	<raid_type> <#raid_params> <raid_params>		\
- *	<#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> }
- *
- * <raid_params> varies by <raid_type>.  See 'parse_raid_params' for
- * details on possible <raid_params>.
- */
-static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
-{
-	int ret;
-	struct raid_type *rt;
-	unsigned long num_raid_params, num_raid_devs;
-	struct raid_set *rs = NULL;
-
-	/* Must have at least <raid_type> <#raid_params> */
-	if (argc < 2) {
-		ti->error = "Too few arguments";
-		return -EINVAL;
-	}
-
-	/* raid type */
-	rt = get_raid_type(argv[0]);
-	if (!rt) {
-		ti->error = "Unrecognised raid_type";
-		return -EINVAL;
-	}
-	argc--;
-	argv++;
-
-	/* number of RAID parameters */
-	if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) {
-		ti->error = "Cannot understand number of RAID parameters";
-		return -EINVAL;
-	}
-	argc--;
-	argv++;
-
-	/* Skip over RAID params for now and find out # of devices */
-	if (num_raid_params + 1 > argc) {
-		ti->error = "Arguments do not agree with counts given";
-		return -EINVAL;
-	}
-
-	if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) ||
-	    (num_raid_devs >= INT_MAX)) {
-		ti->error = "Cannot understand number of raid devices";
-		return -EINVAL;
-	}
-
-	rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
-	if (IS_ERR(rs))
-		return PTR_ERR(rs);
-
-	ret = parse_raid_params(rs, argv, (unsigned)num_raid_params);
-	if (ret)
-		goto bad;
-
-	ret = -EINVAL;
-
-	argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
-	argv += num_raid_params + 1;
-
-	if (argc != (num_raid_devs * 2)) {
-		ti->error = "Supplied RAID devices does not match the count given";
-		goto bad;
-	}
-
-	ret = dev_parms(rs, argv);
-	if (ret)
-		goto bad;
-
-	rs->md.sync_super = super_sync;
-	ret = analyse_superblocks(ti, rs);
-	if (ret)
-		goto bad;
-
-	INIT_WORK(&rs->md.event_work, do_table_event);
-	ti->private = rs;
-	ti->num_flush_requests = 1;
-
-	mutex_lock(&rs->md.reconfig_mutex);
-	ret = md_run(&rs->md);
-	rs->md.in_sync = 0; /* Assume already marked dirty */
-	mutex_unlock(&rs->md.reconfig_mutex);
-
-	if (ret) {
-		ti->error = "Fail to run raid array";
-		goto bad;
-	}
-
-	rs->callbacks.congested_fn = raid_is_congested;
-	dm_table_add_target_callbacks(ti->table, &rs->callbacks);
-
-	mddev_suspend(&rs->md);
-	return 0;
-
-bad:
-	context_free(rs);
-
-	return ret;
-}
-
-static void raid_dtr(struct dm_target *ti)
-{
-	struct raid_set *rs = ti->private;
-
-	list_del_init(&rs->callbacks.list);
-	md_stop(&rs->md);
-	context_free(rs);
-}
-
-static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context)
-{
-	struct raid_set *rs = ti->private;
-	struct mddev *mddev = &rs->md;
-
-	mddev->pers->make_request(mddev, bio);
-
-	return DM_MAPIO_SUBMITTED;
-}
-
-static int raid_status(struct dm_target *ti, status_type_t type,
-		       char *result, unsigned maxlen)
-{
-	struct raid_set *rs = ti->private;
-	unsigned raid_param_cnt = 1; /* at least 1 for chunksize */
-	unsigned sz = 0;
-	int i, array_in_sync = 0;
-	sector_t sync;
-
-	switch (type) {
-	case STATUSTYPE_INFO:
-		DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks);
-
-		if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery))
-			sync = rs->md.curr_resync_completed;
-		else
-			sync = rs->md.recovery_cp;
-
-		if (sync >= rs->md.resync_max_sectors) {
-			array_in_sync = 1;
-			sync = rs->md.resync_max_sectors;
-		} else {
-			/*
-			 * The array may be doing an initial sync, or it may
-			 * be rebuilding individual components.  If all the
-			 * devices are In_sync, then it is the array that is
-			 * being initialized.
-			 */
-			for (i = 0; i < rs->md.raid_disks; i++)
-				if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
-					array_in_sync = 1;
-		}
-		/*
-		 * Status characters:
-		 *  'D' = Dead/Failed device
-		 *  'a' = Alive but not in-sync
-		 *  'A' = Alive and in-sync
-		 */
-		for (i = 0; i < rs->md.raid_disks; i++) {
-			if (test_bit(Faulty, &rs->dev[i].rdev.flags))
-				DMEMIT("D");
-			else if (!array_in_sync ||
-				 !test_bit(In_sync, &rs->dev[i].rdev.flags))
-				DMEMIT("a");
-			else
-				DMEMIT("A");
-		}
-
-		/*
-		 * In-sync ratio:
-		 *  The in-sync ratio shows the progress of:
-		 *   - Initializing the array
-		 *   - Rebuilding a subset of devices of the array
-		 *  The user can distinguish between the two by referring
-		 *  to the status characters.
-		 */
-		DMEMIT(" %llu/%llu",
-		       (unsigned long long) sync,
-		       (unsigned long long) rs->md.resync_max_sectors);
-
-		break;
-	case STATUSTYPE_TABLE:
-		/* The string you would use to construct this array */
-		for (i = 0; i < rs->md.raid_disks; i++) {
-			if ((rs->print_flags & DMPF_REBUILD) &&
-			    rs->dev[i].data_dev &&
-			    !test_bit(In_sync, &rs->dev[i].rdev.flags))
-				raid_param_cnt += 2; /* for rebuilds */
-			if (rs->dev[i].data_dev &&
-			    test_bit(WriteMostly, &rs->dev[i].rdev.flags))
-				raid_param_cnt += 2;
-		}
-
-		raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2);
-		if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))
-			raid_param_cnt--;
-
-		DMEMIT("%s %u %u", rs->raid_type->name,
-		       raid_param_cnt, rs->md.chunk_sectors);
-
-		if ((rs->print_flags & DMPF_SYNC) &&
-		    (rs->md.recovery_cp == MaxSector))
-			DMEMIT(" sync");
-		if (rs->print_flags & DMPF_NOSYNC)
-			DMEMIT(" nosync");
-
-		for (i = 0; i < rs->md.raid_disks; i++)
-			if ((rs->print_flags & DMPF_REBUILD) &&
-			    rs->dev[i].data_dev &&
-			    !test_bit(In_sync, &rs->dev[i].rdev.flags))
-				DMEMIT(" rebuild %u", i);
-
-		if (rs->print_flags & DMPF_DAEMON_SLEEP)
-			DMEMIT(" daemon_sleep %lu",
-			       rs->md.bitmap_info.daemon_sleep);
-
-		if (rs->print_flags & DMPF_MIN_RECOVERY_RATE)
-			DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min);
-
-		if (rs->print_flags & DMPF_MAX_RECOVERY_RATE)
-			DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);
-
-		for (i = 0; i < rs->md.raid_disks; i++)
-			if (rs->dev[i].data_dev &&
-			    test_bit(WriteMostly, &rs->dev[i].rdev.flags))
-				DMEMIT(" write_mostly %u", i);
-
-		if (rs->print_flags & DMPF_MAX_WRITE_BEHIND)
-			DMEMIT(" max_write_behind %lu",
-			       rs->md.bitmap_info.max_write_behind);
-
-		if (rs->print_flags & DMPF_STRIPE_CACHE) {
-			struct r5conf *conf = rs->md.private;
-
-			/* convert from kiB to sectors */
-			DMEMIT(" stripe_cache %d",
-			       conf ? conf->max_nr_stripes * 2 : 0);
-		}
-
-		if (rs->print_flags & DMPF_REGION_SIZE)
-			DMEMIT(" region_size %lu",
-			       rs->md.bitmap_info.chunksize >> 9);
-
-		DMEMIT(" %d", rs->md.raid_disks);
-		for (i = 0; i < rs->md.raid_disks; i++) {
-			if (rs->dev[i].meta_dev)
-				DMEMIT(" %s", rs->dev[i].meta_dev->name);
-			else
-				DMEMIT(" -");
-
-			if (rs->dev[i].data_dev)
-				DMEMIT(" %s", rs->dev[i].data_dev->name);
-			else
-				DMEMIT(" -");
-		}
-	}
-
-	return 0;
-}
-
-static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
-{
-	struct raid_set *rs = ti->private;
-	unsigned i;
-	int ret = 0;
-
-	for (i = 0; !ret && i < rs->md.raid_disks; i++)
-		if (rs->dev[i].data_dev)
-			ret = fn(ti,
-				 rs->dev[i].data_dev,
-				 0, /* No offset on data devs */
-				 rs->md.dev_sectors,
-				 data);
-
-	return ret;
-}
-
-static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
-{
-	struct raid_set *rs = ti->private;
-	unsigned chunk_size = rs->md.chunk_sectors << 9;
-	struct r5conf *conf = rs->md.private;
-
-	blk_limits_io_min(limits, chunk_size);
-	blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded));
-}
-
-static void raid_presuspend(struct dm_target *ti)
-{
-	struct raid_set *rs = ti->private;
-
-	md_stop_writes(&rs->md);
-}
-
-static void raid_postsuspend(struct dm_target *ti)
-{
-	struct raid_set *rs = ti->private;
-
-	mddev_suspend(&rs->md);
-}
-
-static void raid_resume(struct dm_target *ti)
-{
-	struct raid_set *rs = ti->private;
-
-	if (!rs->bitmap_loaded) {
-		bitmap_load(&rs->md);
-		rs->bitmap_loaded = 1;
-	} else
-		md_wakeup_thread(rs->md.thread);
-
-	mddev_resume(&rs->md);
-}
-
-static struct target_type raid_target = {
-	.name = "raid",
-	.version = {1, 2, 0},
-	.module = THIS_MODULE,
-	.ctr = raid_ctr,
-	.dtr = raid_dtr,
-	.map = raid_map,
-	.status = raid_status,
-	.iterate_devices = raid_iterate_devices,
-	.io_hints = raid_io_hints,
-	.presuspend = raid_presuspend,
-	.postsuspend = raid_postsuspend,
-	.resume = raid_resume,
-};
-
-static int __init dm_raid_init(void)
-{
-	return dm_register_target(&raid_target);
-}
-
-static void __exit dm_raid_exit(void)
-{
-	dm_unregister_target(&raid_target);
-}
-
-module_init(dm_raid_init);
-module_exit(dm_raid_exit);
-
-MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target");
-MODULE_ALIAS("dm-raid4");
-MODULE_ALIAS("dm-raid5");
-MODULE_ALIAS("dm-raid6");
-MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
-MODULE_LICENSE("GPL");