diff options
Diffstat (limited to 'drivers/md/dm-raid.c')
| -rw-r--r-- | drivers/md/dm-raid.c | 1174 |
1 files changed, 1085 insertions, 89 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index b9e1e15ef11..4880b69e2e9 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -6,21 +6,23 @@ */ #include <linux/slab.h> +#include <linux/module.h> #include "md.h" +#include "raid1.h" #include "raid5.h" -#include "dm.h" +#include "raid10.h" #include "bitmap.h" +#include <linux/device-mapper.h> + #define DM_MSG_PREFIX "raid" /* - * If the MD doesn't support MD_SYNC_STATE_FORCED yet, then - * make it so the flag doesn't set anything. + * The following flags are used by dm-raid.c to set up the array state. + * They must be cleared before md_run is called. */ -#ifndef MD_SYNC_STATE_FORCED -#define MD_SYNC_STATE_FORCED 0 -#endif +#define FirstUse 10 /* rdev flag */ struct raid_dev { /* @@ -37,26 +39,31 @@ struct raid_dev { */ struct dm_dev *meta_dev; struct dm_dev *data_dev; - struct mdk_rdev_s rdev; + struct md_rdev rdev; }; /* * Flags for rs->print_flags field. */ -#define DMPF_DAEMON_SLEEP 0x1 -#define DMPF_MAX_WRITE_BEHIND 0x2 -#define DMPF_SYNC 0x4 -#define DMPF_NOSYNC 0x8 -#define DMPF_STRIPE_CACHE 0x10 -#define DMPF_MIN_RECOVERY_RATE 0x20 -#define DMPF_MAX_RECOVERY_RATE 0x40 +#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 +#define DMPF_RAID10_COPIES 0x200 +#define DMPF_RAID10_FORMAT 0x400 struct raid_set { struct dm_target *ti; - uint64_t print_flags; + uint32_t bitmap_loaded; + uint32_t print_flags; - struct mddev_s md; + struct mddev md; struct raid_type *raid_type; struct dm_target_callbacks callbacks; @@ -72,6 +79,8 @@ static struct raid_type { const unsigned level; /* RAID level. */ const unsigned algorithm; /* RAID algorithm. */ } raid_types[] = { + {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, + {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, {"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}, @@ -82,6 +91,46 @@ static struct raid_type { {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} }; +static char *raid10_md_layout_to_format(int layout) +{ + /* + * Bit 16 and 17 stand for "offset" and "use_far_sets" + * Refer to MD's raid10.c for details + */ + if ((layout & 0x10000) && (layout & 0x20000)) + return "offset"; + + if ((layout & 0xFF) > 1) + return "near"; + + return "far"; +} + +static unsigned raid10_md_layout_to_copies(int layout) +{ + if ((layout & 0xFF) > 1) + return layout & 0xFF; + return (layout >> 8) & 0xFF; +} + +static int raid10_format_to_md_layout(char *format, unsigned copies) +{ + unsigned n = 1, f = 1; + + if (!strcmp("near", format)) + n = copies; + else + f = copies; + + if (!strcmp("offset", format)) + return 0x30000 | (f << 8) | n; + + if (!strcmp("far", format)) + return 0x20000 | (f << 8) | n; + + return (f << 8) | n; +} + static struct raid_type *get_raid_type(char *name) { int i; @@ -97,19 +146,12 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra { 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 (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"; @@ -123,7 +165,6 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra 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; @@ -138,6 +179,7 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra * rs->md.external * rs->md.chunk_sectors * rs->md.new_chunk_sectors + * rs->md.dev_sectors */ return rs; @@ -147,9 +189,13 @@ static void context_free(struct raid_set *rs) { int i; - for (i = 0; i < rs->md.raid_disks; 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); + md_rdev_clear(&rs->dev[i].rdev); if (rs->dev[i].data_dev) dm_put_device(rs->ti, rs->dev[i].data_dev); + } kfree(rs); } @@ -159,7 +205,16 @@ static void context_free(struct raid_set *rs) * <meta_dev>: meta device name or '-' if missing * <data_dev>: data device name or '-' if missing * - * This code parses those words. + * 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) { @@ -182,8 +237,16 @@ static int dev_parms(struct raid_set *rs, char **argv) rs->dev[i].rdev.mddev = &rs->md; if (strcmp(argv[0], "-")) { - rs->ti->error = "Metadata devices not supported"; - return -EINVAL; + 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], "-")) { @@ -193,6 +256,10 @@ static int dev_parms(struct raid_set *rs, char **argv) return -EINVAL; } + rs->ti->error = "No data device supplied with metadata device"; + if (rs->dev[i].meta_dev) + return -EINVAL; + continue; } @@ -204,6 +271,10 @@ static int dev_parms(struct raid_set *rs, char **argv) 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)) @@ -235,33 +306,217 @@ static int dev_parms(struct raid_set *rs, char **argv) } /* + * 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)) { + /* If not a power of 2, make it the next power of 2 */ + if (min_region_size & (min_region_size - 1)) + region_size = 1 << fls(region_size); + DMINFO("Choosing default region size of %lu sectors", + 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; +} + +/* + * validate_raid_redundancy + * @rs + * + * Determine if there are enough devices in the array that haven't + * failed (or are being rebuilt) to form a usable array. + * + * Returns: 0 on success, -EINVAL on failure. + */ +static int validate_raid_redundancy(struct raid_set *rs) +{ + unsigned i, rebuild_cnt = 0; + unsigned rebuilds_per_group = 0, copies, d; + unsigned group_size, last_group_start; + + for (i = 0; i < rs->md.raid_disks; i++) + if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || + !rs->dev[i].rdev.sb_page) + rebuild_cnt++; + + switch (rs->raid_type->level) { + case 1: + if (rebuild_cnt >= rs->md.raid_disks) + goto too_many; + break; + case 4: + case 5: + case 6: + if (rebuild_cnt > rs->raid_type->parity_devs) + goto too_many; + break; + case 10: + copies = raid10_md_layout_to_copies(rs->md.layout); + if (rebuild_cnt < copies) + break; + + /* + * It is possible to have a higher rebuild count for RAID10, + * as long as the failed devices occur in different mirror + * groups (i.e. different stripes). + * + * When checking "near" format, make sure no adjacent devices + * have failed beyond what can be handled. In addition to the + * simple case where the number of devices is a multiple of the + * number of copies, we must also handle cases where the number + * of devices is not a multiple of the number of copies. + * E.g. dev1 dev2 dev3 dev4 dev5 + * A A B B C + * C D D E E + */ + if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { + for (i = 0; i < rs->md.raid_disks * copies; i++) { + if (!(i % copies)) + rebuilds_per_group = 0; + d = i % rs->md.raid_disks; + if ((!rs->dev[d].rdev.sb_page || + !test_bit(In_sync, &rs->dev[d].rdev.flags)) && + (++rebuilds_per_group >= copies)) + goto too_many; + } + break; + } + + /* + * When checking "far" and "offset" formats, we need to ensure + * that the device that holds its copy is not also dead or + * being rebuilt. (Note that "far" and "offset" formats only + * support two copies right now. These formats also only ever + * use the 'use_far_sets' variant.) + * + * This check is somewhat complicated by the need to account + * for arrays that are not a multiple of (far) copies. This + * results in the need to treat the last (potentially larger) + * set differently. + */ + group_size = (rs->md.raid_disks / copies); + last_group_start = (rs->md.raid_disks / group_size) - 1; + last_group_start *= group_size; + for (i = 0; i < rs->md.raid_disks; i++) { + if (!(i % copies) && !(i > last_group_start)) + rebuilds_per_group = 0; + if ((!rs->dev[i].rdev.sb_page || + !test_bit(In_sync, &rs->dev[i].rdev.flags)) && + (++rebuilds_per_group >= copies)) + goto too_many; + } + break; + default: + if (rebuild_cnt) + return -EINVAL; + } + + return 0; + +too_many: + return -EINVAL; +} + +/* * Possible arguments are... - * RAID456: * <chunk_size> [optional_args] * - * Optional args: - * [[no]sync] Force or prevent recovery of the entire array + * 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 + * [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 + * + * RAID10-only options: + * [raid10_copies <# copies>] Number of copies. (Default: 2) + * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) */ static int parse_raid_params(struct raid_set *rs, char **argv, unsigned num_raid_params) { - unsigned i, rebuild_cnt = 0; - unsigned long value; + char *raid10_format = "near"; + unsigned raid10_copies = 2; + unsigned i; + unsigned long value, region_size = 0; + sector_t sectors_per_dev = rs->ti->len; + sector_t max_io_len; 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) || - !is_power_of_2(value) || (value < 8)) { + if ((kstrtoul(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; @@ -269,22 +524,39 @@ static int parse_raid_params(struct raid_set *rs, char **argv, num_raid_params--; /* - * Second, parse the unordered optional arguments + * 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++) + 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 (!strcmp(argv[i], "nosync")) { + if (!strcasecmp(argv[i], "nosync")) { rs->md.recovery_cp = MaxSector; rs->print_flags |= DMPF_NOSYNC; - rs->md.flags |= MD_SYNC_STATE_FORCED; continue; } - if (!strcmp(argv[i], "sync")) { + if (!strcasecmp(argv[i], "sync")) { rs->md.recovery_cp = 0; rs->print_flags |= DMPF_SYNC; - rs->md.flags |= MD_SYNC_STATE_FORCED; continue; } @@ -295,23 +567,53 @@ static int parse_raid_params(struct raid_set *rs, char **argv, } key = argv[i++]; - if (strict_strtoul(argv[i], 10, &value) < 0) { + + /* Parameters that take a string value are checked here. */ + if (!strcasecmp(key, "raid10_format")) { + if (rs->raid_type->level != 10) { + rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; + return -EINVAL; + } + if (strcmp("near", argv[i]) && + strcmp("far", argv[i]) && + strcmp("offset", argv[i])) { + rs->ti->error = "Invalid 'raid10_format' value given"; + return -EINVAL; + } + raid10_format = argv[i]; + rs->print_flags |= DMPF_RAID10_FORMAT; + continue; + } + + if (kstrtoul(argv[i], 10, &value) < 0) { rs->ti->error = "Bad numerical argument given in raid params"; return -EINVAL; } - if (!strcmp(key, "rebuild")) { - if (++rebuild_cnt > rs->raid_type->parity_devs) { - rs->ti->error = "Too many rebuild drives given"; - return -EINVAL; - } - if (value > rs->md.raid_disks) { + /* Parameters that take a numeric value are checked here */ + if (!strcasecmp(key, "rebuild")) { + 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; - } else if (!strcmp(key, "max_write_behind")) { + 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; /* @@ -324,14 +626,14 @@ static int parse_raid_params(struct raid_set *rs, char **argv, return -EINVAL; } rs->md.bitmap_info.max_write_behind = value; - } else if (!strcmp(key, "daemon_sleep")) { + } 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 (!strcmp(key, "stripe_cache")) { + } else if (!strcasecmp(key, "stripe_cache")) { rs->print_flags |= DMPF_STRIPE_CACHE; /* @@ -340,7 +642,8 @@ static int parse_raid_params(struct raid_set *rs, char **argv, */ value /= 2; - if (rs->raid_type->level < 5) { + if ((rs->raid_type->level != 5) && + (rs->raid_type->level != 6)) { rs->ti->error = "Inappropriate argument: stripe_cache"; return -EINVAL; } @@ -348,20 +651,31 @@ static int parse_raid_params(struct raid_set *rs, char **argv, rs->ti->error = "Bad stripe_cache size"; return -EINVAL; } - } else if (!strcmp(key, "min_recovery_rate")) { + } 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 (!strcmp(key, "max_recovery_rate")) { + } 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 if (!strcasecmp(key, "raid10_copies") && + (rs->raid_type->level == 10)) { + if ((value < 2) || (value > 0xFF)) { + rs->ti->error = "Bad value for 'raid10_copies'"; + return -EINVAL; + } + rs->print_flags |= DMPF_RAID10_COPIES; + raid10_copies = value; } else { DMERR("Unable to parse RAID parameter: %s", key); rs->ti->error = "Unable to parse RAID parameters"; @@ -369,6 +683,47 @@ static int parse_raid_params(struct raid_set *rs, char **argv, } } + if (validate_region_size(rs, region_size)) + return -EINVAL; + + if (rs->md.chunk_sectors) + max_io_len = rs->md.chunk_sectors; + else + max_io_len = region_size; + + if (dm_set_target_max_io_len(rs->ti, max_io_len)) + return -EINVAL; + + if (rs->raid_type->level == 10) { + if (raid10_copies > rs->md.raid_disks) { + rs->ti->error = "Not enough devices to satisfy specification"; + return -EINVAL; + } + + /* + * If the format is not "near", we only support + * two copies at the moment. + */ + if (strcmp("near", raid10_format) && (raid10_copies > 2)) { + rs->ti->error = "Too many copies for given RAID10 format."; + return -EINVAL; + } + + /* (Len * #mirrors) / #devices */ + sectors_per_dev = rs->ti->len * raid10_copies; + sector_div(sectors_per_dev, rs->md.raid_disks); + + rs->md.layout = raid10_format_to_md_layout(raid10_format, + raid10_copies); + rs->md.new_layout = rs->md.layout; + } else if ((rs->raid_type->level > 1) && + sector_div(sectors_per_dev, + (rs->md.raid_disks - rs->raid_type->parity_devs))) { + rs->ti->error = "Target length not divisible by number of data devices"; + return -EINVAL; + } + rs->md.dev_sectors = sectors_per_dev; + /* Assume there are no metadata devices until the drives are parsed */ rs->md.persistent = 0; rs->md.external = 1; @@ -387,14 +742,411 @@ 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); + + if (rs->raid_type->level == 10) + return md_raid10_congested(&rs->md, bits); + return md_raid5_congested(&rs->md, bits); } -static void raid_unplug(struct dm_target_callbacks *cb) +/* + * 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) { - struct raid_set *rs = container_of(cb, struct raid_set, callbacks); + 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); + md_error(rdev->mddev, rdev); + return -EINVAL; + } + + rdev->sb_loaded = 1; + + return 0; +} + +static void super_sync(struct mddev *mddev, struct md_rdev *rdev) +{ + int i; + uint64_t failed_devices; + struct dm_raid_superblock *sb; + struct raid_set *rs = container_of(mddev, struct raid_set, md); + + sb = page_address(rdev->sb_page); + failed_devices = le64_to_cpu(sb->failed_devices); + + for (i = 0; i < mddev->raid_disks; i++) + if (!rs->dev[i].data_dev || + test_bit(Faulty, &(rs->dev[i].rdev.flags))) + failed_devices |= (1ULL << i); + + 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; + } - md_raid5_unplug_device(rs->md.private); + 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) { + DMERR("Reshaping arrays not yet supported. (RAID level change)"); + return -EINVAL; + } + if (le32_to_cpu(sb->layout) != mddev->layout) { + DMERR("Reshaping arrays not yet supported. (RAID layout change)"); + DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); + DMERR(" Old layout: %s w/ %d copies", + raid10_md_layout_to_format(le32_to_cpu(sb->layout)), + raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); + DMERR(" New layout: %s w/ %d copies", + raid10_md_layout_to_format(mddev->layout), + raid10_md_layout_to_copies(mddev->layout)); + return -EINVAL; + } + if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { + DMERR("Reshaping arrays not yet supported. (stripe sectors change)"); + 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. (device count change)"); + 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; + struct raid_dev *dev; + struct md_rdev *rdev, *tmp, *freshest; + struct mddev *mddev = &rs->md; + + freshest = NULL; + rdev_for_each_safe(rdev, tmp, mddev) { + /* + * Skipping super_load due to DMPF_SYNC will cause + * the array to undergo initialization again as + * though it were new. This is the intended effect + * of the "sync" directive. + * + * When reshaping capability is added, we must ensure + * that the "sync" directive is disallowed during the + * reshape. + */ + if (rs->print_flags & DMPF_SYNC) + continue; + + 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 (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); + } + } + + if (!freshest) + return 0; + + if (validate_raid_redundancy(rs)) { + rs->ti->error = "Insufficient redundancy to activate array"; + return -EINVAL; + } + + /* + * 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; } /* @@ -403,8 +1155,6 @@ static void raid_unplug(struct dm_target_callbacks *cb) * <raid_type> <#raid_params> <raid_params> \ * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } * - * ** metadata devices are not supported yet, use '-' instead ** - * * <raid_params> varies by <raid_type>. See 'parse_raid_params' for * details on possible <raid_params>. */ @@ -431,7 +1181,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) argv++; /* number of RAID parameters */ - if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { + if (kstrtoul(argv[0], 10, &num_raid_params) < 0) { ti->error = "Cannot understand number of RAID parameters"; return -EINVAL; } @@ -444,7 +1194,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) return -EINVAL; } - if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || + if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || (num_raid_devs >= INT_MAX)) { ti->error = "Cannot understand number of raid devices"; return -EINVAL; @@ -472,9 +1222,14 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **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->split_io = rs->md.chunk_sectors; ti->private = rs; + ti->num_flush_bios = 1; mutex_lock(&rs->md.reconfig_mutex); ret = md_run(&rs->md); @@ -486,12 +1241,19 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) goto bad; } + if (ti->len != rs->md.array_sectors) { + ti->error = "Array size does not match requested target length"; + ret = -EINVAL; + goto size_mismatch; + } rs->callbacks.congested_fn = raid_is_congested; - rs->callbacks.unplug_fn = raid_unplug; dm_table_add_target_callbacks(ti->table, &rs->callbacks); + mddev_suspend(&rs->md); return 0; +size_mismatch: + md_stop(&rs->md); bad: context_free(rs); @@ -507,59 +1269,142 @@ static void raid_dtr(struct dm_target *ti) context_free(rs); } -static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context) +static int raid_map(struct dm_target *ti, struct bio *bio) { struct raid_set *rs = ti->private; - mddev_t *mddev = &rs->md; + 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) +static const char *decipher_sync_action(struct mddev *mddev) +{ + if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) + return "frozen"; + + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { + if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + return "reshape"; + + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + return "resync"; + else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) + return "check"; + return "repair"; + } + + if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) + return "recover"; + } + + return "idle"; +} + +static void raid_status(struct dm_target *ti, status_type_t type, + unsigned status_flags, 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; + 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); - for (i = 0; i < rs->md.raid_disks; i++) { - if (test_bit(Faulty, &rs->dev[i].rdev.flags)) - DMEMIT("D"); - else if (test_bit(In_sync, &rs->dev[i].rdev.flags)) - DMEMIT("A"); - else - DMEMIT("a"); - } - 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) + if (sync >= rs->md.resync_max_sectors) { + /* + * Sync complete. + */ + array_in_sync = 1; sync = rs->md.resync_max_sectors; + } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { + /* + * If "check" or "repair" is occurring, the array has + * undergone and initial sync and the health characters + * should not be 'a' anymore. + */ + array_in_sync = 1; + } 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); + /* + * Sync action: + * See Documentation/device-mapper/dm-raid.c for + * information on each of these states. + */ + DMEMIT(" %s", decipher_sync_action(&rs->md)); + + /* + * resync_mismatches/mismatch_cnt + * This field shows the number of discrepancies found when + * performing a "check" of the array. + */ + DMEMIT(" %llu", + (strcmp(rs->md.last_sync_action, "check")) ? 0 : + (unsigned long long) + atomic64_read(&rs->md.resync_mismatches)); break; case STATUSTYPE_TABLE: /* The string you would use to construct this array */ - for (i = 0; i < rs->md.raid_disks; i++) - if (rs->dev[i].data_dev && + 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++; /* for rebuilds */ + 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 += (hweight64(rs->print_flags) * 2); + raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) raid_param_cnt--; @@ -573,7 +1418,8 @@ static int raid_status(struct dm_target *ti, status_type_t type, DMEMIT(" nosync"); for (i = 0; i < rs->md.raid_disks; i++) - if (rs->dev[i].data_dev && + if ((rs->print_flags & DMPF_REBUILD) && + rs->dev[i].data_dev && !test_bit(In_sync, &rs->dev[i].rdev.flags)) DMEMIT(" rebuild %u", i); @@ -587,21 +1433,41 @@ static int raid_status(struct dm_target *ti, status_type_t type, 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) { - raid5_conf_t *conf = rs->md.private; + 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); + + if (rs->print_flags & DMPF_RAID10_COPIES) + DMEMIT(" raid10_copies %u", + raid10_md_layout_to_copies(rs->md.layout)); + + if (rs->print_flags & DMPF_RAID10_FORMAT) + DMEMIT(" raid10_format %s", + raid10_md_layout_to_format(rs->md.layout)); + DMEMIT(" %d", rs->md.raid_disks); for (i = 0; i < rs->md.raid_disks; i++) { - DMEMIT(" -"); /* metadata device */ + 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); @@ -609,11 +1475,64 @@ static int raid_status(struct dm_target *ti, status_type_t type, DMEMIT(" -"); } } +} + +static int raid_message(struct dm_target *ti, unsigned argc, char **argv) +{ + struct raid_set *rs = ti->private; + struct mddev *mddev = &rs->md; + + if (!strcasecmp(argv[0], "reshape")) { + DMERR("Reshape not supported."); + return -EINVAL; + } + + if (!mddev->pers || !mddev->pers->sync_request) + return -EINVAL; + + if (!strcasecmp(argv[0], "frozen")) + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + else + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + + if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { + if (mddev->sync_thread) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + md_reap_sync_thread(mddev); + } + } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) + return -EBUSY; + else if (!strcasecmp(argv[0], "resync")) + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + else if (!strcasecmp(argv[0], "recover")) { + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + } else { + if (!strcasecmp(argv[0], "check")) + set_bit(MD_RECOVERY_CHECK, &mddev->recovery); + else if (!!strcasecmp(argv[0], "repair")) + return -EINVAL; + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + } + if (mddev->ro == 2) { + /* A write to sync_action is enough to justify + * canceling read-auto mode + */ + mddev->ro = 0; + if (!mddev->suspended) + md_wakeup_thread(mddev->sync_thread); + } + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + if (!mddev->suspended) + md_wakeup_thread(mddev->thread); return 0; } -static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) +static int raid_iterate_devices(struct dm_target *ti, + iterate_devices_callout_fn fn, void *data) { struct raid_set *rs = ti->private; unsigned i; @@ -634,7 +1553,7 @@ 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; - raid5_conf_t *conf = rs->md.private; + 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)); @@ -654,21 +1573,92 @@ static void raid_postsuspend(struct dm_target *ti) mddev_suspend(&rs->md); } +static void attempt_restore_of_faulty_devices(struct raid_set *rs) +{ + int i; + uint64_t failed_devices, cleared_failed_devices = 0; + unsigned long flags; + struct dm_raid_superblock *sb; + struct md_rdev *r; + + for (i = 0; i < rs->md.raid_disks; i++) { + r = &rs->dev[i].rdev; + if (test_bit(Faulty, &r->flags) && r->sb_page && + sync_page_io(r, 0, r->sb_size, r->sb_page, READ, 1)) { + DMINFO("Faulty %s device #%d has readable super block." + " Attempting to revive it.", + rs->raid_type->name, i); + + /* + * Faulty bit may be set, but sometimes the array can + * be suspended before the personalities can respond + * by removing the device from the array (i.e. calling + * 'hot_remove_disk'). If they haven't yet removed + * the failed device, its 'raid_disk' number will be + * '>= 0' - meaning we must call this function + * ourselves. + */ + if ((r->raid_disk >= 0) && + (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) + /* Failed to revive this device, try next */ + continue; + + r->raid_disk = i; + r->saved_raid_disk = i; + flags = r->flags; + clear_bit(Faulty, &r->flags); + clear_bit(WriteErrorSeen, &r->flags); + clear_bit(In_sync, &r->flags); + if (r->mddev->pers->hot_add_disk(r->mddev, r)) { + r->raid_disk = -1; + r->saved_raid_disk = -1; + r->flags = flags; + } else { + r->recovery_offset = 0; + cleared_failed_devices |= 1 << i; + } + } + } + if (cleared_failed_devices) { + rdev_for_each(r, &rs->md) { + sb = page_address(r->sb_page); + failed_devices = le64_to_cpu(sb->failed_devices); + failed_devices &= ~cleared_failed_devices; + sb->failed_devices = cpu_to_le64(failed_devices); + } + } +} + static void raid_resume(struct dm_target *ti) { struct raid_set *rs = ti->private; + set_bit(MD_CHANGE_DEVS, &rs->md.flags); + if (!rs->bitmap_loaded) { + bitmap_load(&rs->md); + rs->bitmap_loaded = 1; + } else { + /* + * A secondary resume while the device is active. + * Take this opportunity to check whether any failed + * devices are reachable again. + */ + attempt_restore_of_faulty_devices(rs); + } + + clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); mddev_resume(&rs->md); } static struct target_type raid_target = { .name = "raid", - .version = {1, 0, 0}, + .version = {1, 5, 2}, .module = THIS_MODULE, .ctr = raid_ctr, .dtr = raid_dtr, .map = raid_map, .status = raid_status, + .message = raid_message, .iterate_devices = raid_iterate_devices, .io_hints = raid_io_hints, .presuspend = raid_presuspend, @@ -678,6 +1668,10 @@ static struct target_type raid_target = { static int __init dm_raid_init(void) { + DMINFO("Loading target version %u.%u.%u", + raid_target.version[0], + raid_target.version[1], + raid_target.version[2]); return dm_register_target(&raid_target); } @@ -690,6 +1684,8 @@ module_init(dm_raid_init); module_exit(dm_raid_exit); MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); +MODULE_ALIAS("dm-raid1"); +MODULE_ALIAS("dm-raid10"); MODULE_ALIAS("dm-raid4"); MODULE_ALIAS("dm-raid5"); MODULE_ALIAS("dm-raid6"); |