diff options
Diffstat (limited to 'drivers/md/dm-raid.c')
| -rw-r--r-- | drivers/md/dm-raid.c | 3865 |
1 files changed, 3173 insertions, 692 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 4880b69e2e9e..c6f7129e43d3 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1,6 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2010-2011 Neil Brown - * Copyright (C) 2010-2011 Red Hat, Inc. All rights reserved. + * Copyright (C) 2010-2018 Red Hat, Inc. All rights reserved. * * This file is released under the GPL. */ @@ -12,22 +13,35 @@ #include "raid1.h" #include "raid5.h" #include "raid10.h" -#include "bitmap.h" +#include "md-bitmap.h" #include <linux/device-mapper.h> #define DM_MSG_PREFIX "raid" +#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */ /* - * The following flags are used by dm-raid.c to set up the array state. + * Minimum sectors of free reshape space per raid device + */ +#define MIN_FREE_RESHAPE_SPACE to_sector(4*4096) + +/* + * Minimum journal space 4 MiB in sectors. + */ +#define MIN_RAID456_JOURNAL_SPACE (4*2048) + +static bool devices_handle_discard_safely; + +/* + * The following flags are used by dm-raid to set up the array state. * They must be cleared before md_run is called. */ -#define FirstUse 10 /* rdev flag */ +#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 + * actual data/parity. The reason for this is to not confuse * ti->len and give more flexibility in altering size and * characteristics. * @@ -43,108 +57,686 @@ struct raid_dev { }; /* - * Flags for rs->print_flags field. + * Bits for establishing rs->ctr_flags + * + * 1 = no flag value + * 2 = flag with value */ -#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 +#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */ +#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */ +#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */ +#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */ +#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */ +#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */ +#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */ +#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */ +#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */ +#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */ +#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */ +#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */ +/* New for v1.9.0 */ +#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */ +#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */ +#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */ + +/* New for v1.10.0 */ +#define __CTR_FLAG_JOURNAL_DEV 15 /* 2 */ /* Only with raid4/5/6 (journal device)! */ + +/* New for v1.11.1 */ +#define __CTR_FLAG_JOURNAL_MODE 16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */ + +/* + * Flags for rs->ctr_flags field. + */ +#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC) +#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC) +#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD) +#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP) +#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE) +#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE) +#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND) +#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY) +#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE) +#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE) +#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES) +#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT) +#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS) +#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET) +#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS) +#define CTR_FLAG_JOURNAL_DEV (1 << __CTR_FLAG_JOURNAL_DEV) +#define CTR_FLAG_JOURNAL_MODE (1 << __CTR_FLAG_JOURNAL_MODE) + +/* + * Definitions of various constructor flags to + * be used in checks of valid / invalid flags + * per raid level. + */ +/* Define all any sync flags */ +#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC) + +/* Define flags for options without argument (e.g. 'nosync') */ +#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \ + CTR_FLAG_RAID10_USE_NEAR_SETS) + +/* Define flags for options with one argument (e.g. 'delta_disks +2') */ +#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \ + CTR_FLAG_WRITE_MOSTLY | \ + CTR_FLAG_DAEMON_SLEEP | \ + CTR_FLAG_MIN_RECOVERY_RATE | \ + CTR_FLAG_MAX_RECOVERY_RATE | \ + CTR_FLAG_MAX_WRITE_BEHIND | \ + CTR_FLAG_STRIPE_CACHE | \ + CTR_FLAG_REGION_SIZE | \ + CTR_FLAG_RAID10_COPIES | \ + CTR_FLAG_RAID10_FORMAT | \ + CTR_FLAG_DELTA_DISKS | \ + CTR_FLAG_DATA_OFFSET | \ + CTR_FLAG_JOURNAL_DEV | \ + CTR_FLAG_JOURNAL_MODE) + +/* Valid options definitions per raid level... */ + +/* "raid0" does only accept data offset */ +#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET) + +/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */ +#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ + CTR_FLAG_REBUILD | \ + CTR_FLAG_WRITE_MOSTLY | \ + CTR_FLAG_DAEMON_SLEEP | \ + CTR_FLAG_MIN_RECOVERY_RATE | \ + CTR_FLAG_MAX_RECOVERY_RATE | \ + CTR_FLAG_MAX_WRITE_BEHIND | \ + CTR_FLAG_REGION_SIZE | \ + CTR_FLAG_DELTA_DISKS | \ + CTR_FLAG_DATA_OFFSET) + +/* "raid10" does not accept any raid1 or stripe cache options */ +#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ + CTR_FLAG_REBUILD | \ + CTR_FLAG_DAEMON_SLEEP | \ + CTR_FLAG_MIN_RECOVERY_RATE | \ + CTR_FLAG_MAX_RECOVERY_RATE | \ + CTR_FLAG_REGION_SIZE | \ + CTR_FLAG_RAID10_COPIES | \ + CTR_FLAG_RAID10_FORMAT | \ + CTR_FLAG_DELTA_DISKS | \ + CTR_FLAG_DATA_OFFSET | \ + CTR_FLAG_RAID10_USE_NEAR_SETS) + +/* + * "raid4/5/6" do not accept any raid1 or raid10 specific options + * + * "raid6" does not accept "nosync", because it is not guaranteed + * that both parity and q-syndrome are being written properly with + * any writes + */ +#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ + CTR_FLAG_REBUILD | \ + CTR_FLAG_DAEMON_SLEEP | \ + CTR_FLAG_MIN_RECOVERY_RATE | \ + CTR_FLAG_MAX_RECOVERY_RATE | \ + CTR_FLAG_STRIPE_CACHE | \ + CTR_FLAG_REGION_SIZE | \ + CTR_FLAG_DELTA_DISKS | \ + CTR_FLAG_DATA_OFFSET | \ + CTR_FLAG_JOURNAL_DEV | \ + CTR_FLAG_JOURNAL_MODE) + +#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \ + CTR_FLAG_REBUILD | \ + CTR_FLAG_DAEMON_SLEEP | \ + CTR_FLAG_MIN_RECOVERY_RATE | \ + CTR_FLAG_MAX_RECOVERY_RATE | \ + CTR_FLAG_STRIPE_CACHE | \ + CTR_FLAG_REGION_SIZE | \ + CTR_FLAG_DELTA_DISKS | \ + CTR_FLAG_DATA_OFFSET | \ + CTR_FLAG_JOURNAL_DEV | \ + CTR_FLAG_JOURNAL_MODE) +/* ...valid options definitions per raid level */ + +/* + * Flags for rs->runtime_flags field + * (RT_FLAG prefix meaning "runtime flag") + * + * These are all internal and used to define runtime state, + * e.g. to prevent another resume from preresume processing + * the raid set all over again. + */ +#define RT_FLAG_RS_PRERESUMED 0 +#define RT_FLAG_RS_RESUMED 1 +#define RT_FLAG_RS_BITMAP_LOADED 2 +#define RT_FLAG_UPDATE_SBS 3 +#define RT_FLAG_RESHAPE_RS 4 +#define RT_FLAG_RS_SUSPENDED 5 +#define RT_FLAG_RS_IN_SYNC 6 +#define RT_FLAG_RS_RESYNCING 7 +#define RT_FLAG_RS_GROW 8 +#define RT_FLAG_RS_FROZEN 9 + +/* Array elements of 64 bit needed for rebuild/failed disk bits */ +#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8) + +/* + * raid set level, layout and chunk sectors backup/restore + */ +struct rs_layout { + int new_level; + int new_layout; + int new_chunk_sectors; +}; struct raid_set { struct dm_target *ti; - uint32_t bitmap_loaded; - uint32_t print_flags; + uint32_t stripe_cache_entries; + unsigned long ctr_flags; + unsigned long runtime_flags; + + uint64_t rebuild_disks[DISKS_ARRAY_ELEMS]; + + int raid_disks; + int delta_disks; + int data_offset; + int raid10_copies; + int requested_bitmap_chunk_sectors; struct mddev md; struct raid_type *raid_type; - struct dm_target_callbacks callbacks; - struct raid_dev dev[0]; + sector_t array_sectors; + sector_t dev_sectors; + + /* Optional raid4/5/6 journal device */ + struct journal_dev { + struct dm_dev *dev; + struct md_rdev rdev; + int mode; + } journal_dev; + + struct raid_dev dev[] __counted_by(raid_disks); }; +static void rs_config_backup(struct raid_set *rs, struct rs_layout *l) +{ + struct mddev *mddev = &rs->md; + + l->new_level = mddev->new_level; + l->new_layout = mddev->new_layout; + l->new_chunk_sectors = mddev->new_chunk_sectors; +} + +static void rs_config_restore(struct raid_set *rs, struct rs_layout *l) +{ + struct mddev *mddev = &rs->md; + + mddev->new_level = l->new_level; + mddev->new_layout = l->new_layout; + mddev->new_chunk_sectors = l->new_chunk_sectors; +} + +/* raid10 algorithms (i.e. formats) */ +#define ALGORITHM_RAID10_DEFAULT 0 +#define ALGORITHM_RAID10_NEAR 1 +#define ALGORITHM_RAID10_OFFSET 2 +#define ALGORITHM_RAID10_FAR 3 + /* 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. */ + const unsigned int parity_devs; /* # of parity devices. */ + const unsigned int minimal_devs;/* minimal # of devices in set. */ + const unsigned int level; /* RAID level. */ + const unsigned int 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}, - {"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} + {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */}, + {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */}, + {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR}, + {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET}, + {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR}, + {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT}, + {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */ + {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N}, + {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, + {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, + {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, + {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, + {"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}, + {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6}, + {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6}, + {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6}, + {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6}, + {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6} }; -static char *raid10_md_layout_to_format(int layout) +/* True, if @v is in inclusive range [@min, @max] */ +static bool __within_range(long v, long min, long max) +{ + return v >= min && v <= max; +} + +/* All table line arguments are defined here */ +static struct arg_name_flag { + const unsigned long flag; + const char *name; +} __arg_name_flags[] = { + { CTR_FLAG_SYNC, "sync"}, + { CTR_FLAG_NOSYNC, "nosync"}, + { CTR_FLAG_REBUILD, "rebuild"}, + { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"}, + { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"}, + { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"}, + { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"}, + { CTR_FLAG_WRITE_MOSTLY, "write_mostly"}, + { CTR_FLAG_STRIPE_CACHE, "stripe_cache"}, + { CTR_FLAG_REGION_SIZE, "region_size"}, + { CTR_FLAG_RAID10_COPIES, "raid10_copies"}, + { CTR_FLAG_RAID10_FORMAT, "raid10_format"}, + { CTR_FLAG_DATA_OFFSET, "data_offset"}, + { CTR_FLAG_DELTA_DISKS, "delta_disks"}, + { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"}, + { CTR_FLAG_JOURNAL_DEV, "journal_dev" }, + { CTR_FLAG_JOURNAL_MODE, "journal_mode" }, +}; + +/* Return argument name string for given @flag */ +static const char *dm_raid_arg_name_by_flag(const uint32_t flag) +{ + if (hweight32(flag) == 1) { + struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags); + + while (anf-- > __arg_name_flags) + if (flag & anf->flag) + return anf->name; + + } else + DMERR("%s called with more than one flag!", __func__); + + return NULL; +} + +/* Define correlation of raid456 journal cache modes and dm-raid target line parameters */ +static struct { + const int mode; + const char *param; +} _raid456_journal_mode[] = { + { R5C_JOURNAL_MODE_WRITE_THROUGH, "writethrough" }, + { R5C_JOURNAL_MODE_WRITE_BACK, "writeback" } +}; + +/* Return MD raid4/5/6 journal mode for dm @journal_mode one */ +static int dm_raid_journal_mode_to_md(const char *mode) +{ + int m = ARRAY_SIZE(_raid456_journal_mode); + + while (m--) + if (!strcasecmp(mode, _raid456_journal_mode[m].param)) + return _raid456_journal_mode[m].mode; + + return -EINVAL; +} + +/* Return dm-raid raid4/5/6 journal mode string for @mode */ +static const char *md_journal_mode_to_dm_raid(const int mode) +{ + int m = ARRAY_SIZE(_raid456_journal_mode); + + while (m--) + if (mode == _raid456_journal_mode[m].mode) + return _raid456_journal_mode[m].param; + + return "unknown"; +} + +/* + * Bool helpers to test for various raid levels of a raid set. + * It's level as reported by the superblock rather than + * the requested raid_type passed to the constructor. + */ +/* Return true, if raid set in @rs is raid0 */ +static bool rs_is_raid0(struct raid_set *rs) +{ + return !rs->md.level; +} + +/* Return true, if raid set in @rs is raid1 */ +static bool rs_is_raid1(struct raid_set *rs) +{ + return rs->md.level == 1; +} + +/* Return true, if raid set in @rs is raid10 */ +static bool rs_is_raid10(struct raid_set *rs) +{ + return rs->md.level == 10; +} + +/* Return true, if raid set in @rs is level 6 */ +static bool rs_is_raid6(struct raid_set *rs) +{ + return rs->md.level == 6; +} + +/* Return true, if raid set in @rs is level 4, 5 or 6 */ +static bool rs_is_raid456(struct raid_set *rs) +{ + return __within_range(rs->md.level, 4, 6); +} + +/* Return true, if raid set in @rs is reshapable */ +static bool __is_raid10_far(int layout); +static bool rs_is_reshapable(struct raid_set *rs) +{ + return rs_is_raid456(rs) || + (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout)); +} + +/* Return true, if raid set in @rs is recovering */ +static bool rs_is_recovering(struct raid_set *rs) +{ + return rs->md.resync_offset < rs->md.dev_sectors; +} + +/* Return true, if raid set in @rs is reshaping */ +static bool rs_is_reshaping(struct raid_set *rs) +{ + return rs->md.reshape_position != MaxSector; +} + +/* + * bool helpers to test for various raid levels of a raid type @rt + */ + +/* Return true, if raid type in @rt is raid0 */ +static bool rt_is_raid0(struct raid_type *rt) +{ + return !rt->level; +} + +/* Return true, if raid type in @rt is raid1 */ +static bool rt_is_raid1(struct raid_type *rt) +{ + return rt->level == 1; +} + +/* Return true, if raid type in @rt is raid10 */ +static bool rt_is_raid10(struct raid_type *rt) +{ + return rt->level == 10; +} + +/* Return true, if raid type in @rt is raid4/5 */ +static bool rt_is_raid45(struct raid_type *rt) +{ + return __within_range(rt->level, 4, 5); +} + +/* Return true, if raid type in @rt is raid6 */ +static bool rt_is_raid6(struct raid_type *rt) +{ + return rt->level == 6; +} + +/* Return true, if raid type in @rt is raid4/5/6 */ +static bool rt_is_raid456(struct raid_type *rt) +{ + return __within_range(rt->level, 4, 6); +} +/* END: raid level bools */ + +/* Return valid ctr flags for the raid level of @rs */ +static unsigned long __valid_flags(struct raid_set *rs) +{ + if (rt_is_raid0(rs->raid_type)) + return RAID0_VALID_FLAGS; + else if (rt_is_raid1(rs->raid_type)) + return RAID1_VALID_FLAGS; + else if (rt_is_raid10(rs->raid_type)) + return RAID10_VALID_FLAGS; + else if (rt_is_raid45(rs->raid_type)) + return RAID45_VALID_FLAGS; + else if (rt_is_raid6(rs->raid_type)) + return RAID6_VALID_FLAGS; + + return 0; +} + +/* + * Check for valid flags set on @rs + * + * Has to be called after parsing of the ctr flags! + */ +static int rs_check_for_valid_flags(struct raid_set *rs) +{ + if (rs->ctr_flags & ~__valid_flags(rs)) { + rs->ti->error = "Invalid flags combination"; + return -EINVAL; + } + + return 0; +} + +/* MD raid10 bit definitions and helpers */ +#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */ +#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */ +#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */ +#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */ + +/* Return md raid10 near copies for @layout */ +static unsigned int __raid10_near_copies(int layout) +{ + return layout & 0xFF; +} + +/* Return md raid10 far copies for @layout */ +static unsigned int __raid10_far_copies(int layout) +{ + return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT); +} + +/* Return true if md raid10 offset for @layout */ +static bool __is_raid10_offset(int layout) +{ + return !!(layout & RAID10_OFFSET); +} + +/* Return true if md raid10 near for @layout */ +static bool __is_raid10_near(int layout) +{ + return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1; +} + +/* Return true if md raid10 far for @layout */ +static bool __is_raid10_far(int layout) +{ + return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1; +} + +/* Return md raid10 layout string for @layout */ +static const char *raid10_md_layout_to_format(int layout) { /* - * Bit 16 and 17 stand for "offset" and "use_far_sets" + * Bit 16 stands for "offset" + * (i.e. adjacent stripes hold copies) + * * Refer to MD's raid10.c for details */ - if ((layout & 0x10000) && (layout & 0x20000)) + if (__is_raid10_offset(layout)) return "offset"; - if ((layout & 0xFF) > 1) + if (__raid10_near_copies(layout) > 1) return "near"; - return "far"; + if (__raid10_far_copies(layout) > 1) + return "far"; + + return "unknown"; } -static unsigned raid10_md_layout_to_copies(int layout) +/* Return md raid10 algorithm for @name */ +static int raid10_name_to_format(const char *name) { - if ((layout & 0xFF) > 1) - return layout & 0xFF; - return (layout >> 8) & 0xFF; + if (!strcasecmp(name, "near")) + return ALGORITHM_RAID10_NEAR; + else if (!strcasecmp(name, "offset")) + return ALGORITHM_RAID10_OFFSET; + else if (!strcasecmp(name, "far")) + return ALGORITHM_RAID10_FAR; + + return -EINVAL; } -static int raid10_format_to_md_layout(char *format, unsigned copies) +/* Return md raid10 copies for @layout */ +static unsigned int raid10_md_layout_to_copies(int layout) { - unsigned n = 1, f = 1; + return max(__raid10_near_copies(layout), __raid10_far_copies(layout)); +} - if (!strcmp("near", format)) +/* Return md raid10 format id for @format string */ +static int raid10_format_to_md_layout(struct raid_set *rs, + unsigned int algorithm, + unsigned int copies) +{ + unsigned int n = 1, f = 1, r = 0; + + /* + * MD resilienece flaw: + * + * enabling use_far_sets for far/offset formats causes copies + * to be colocated on the same devs together with their origins! + * + * -> disable it for now in the definition above + */ + if (algorithm == ALGORITHM_RAID10_DEFAULT || + algorithm == ALGORITHM_RAID10_NEAR) n = copies; - else + + else if (algorithm == ALGORITHM_RAID10_OFFSET) { f = copies; + r = RAID10_OFFSET; + if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) + r |= RAID10_USE_FAR_SETS; - if (!strcmp("offset", format)) - return 0x30000 | (f << 8) | n; + } else if (algorithm == ALGORITHM_RAID10_FAR) { + f = copies; + if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) + r |= RAID10_USE_FAR_SETS; - if (!strcmp("far", format)) - return 0x20000 | (f << 8) | n; + } else + return -EINVAL; - return (f << 8) | n; + return r | (f << RAID10_FAR_COPIES_SHIFT) | n; } +/* END: MD raid10 bit definitions and helpers */ -static struct raid_type *get_raid_type(char *name) +/* Check for any of the raid10 algorithms */ +static bool __got_raid10(struct raid_type *rtp, const int layout) { - int i; + if (rtp->level == 10) { + switch (rtp->algorithm) { + case ALGORITHM_RAID10_DEFAULT: + case ALGORITHM_RAID10_NEAR: + return __is_raid10_near(layout); + case ALGORITHM_RAID10_OFFSET: + return __is_raid10_offset(layout); + case ALGORITHM_RAID10_FAR: + return __is_raid10_far(layout); + default: + break; + } + } + + return false; +} + +/* Return raid_type for @name */ +static struct raid_type *get_raid_type(const char *name) +{ + struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); - for (i = 0; i < ARRAY_SIZE(raid_types); i++) - if (!strcmp(raid_types[i].name, name)) - return &raid_types[i]; + while (rtp-- > raid_types) + if (!strcasecmp(rtp->name, name)) + return rtp; return NULL; } -static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) +/* Return raid_type for @name based derived from @level and @layout */ +static struct raid_type *get_raid_type_by_ll(const int level, const int layout) +{ + struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); + + while (rtp-- > raid_types) { + /* RAID10 special checks based on @layout flags/properties */ + if (rtp->level == level && + (__got_raid10(rtp, layout) || rtp->algorithm == layout)) + return rtp; + } + + return NULL; +} + +/* Adjust rdev sectors */ +static void rs_set_rdev_sectors(struct raid_set *rs) +{ + struct mddev *mddev = &rs->md; + struct md_rdev *rdev; + + /* + * raid10 sets rdev->sector to the device size, which + * is unintended in case of out-of-place reshaping + */ + rdev_for_each(rdev, mddev) + if (!test_bit(Journal, &rdev->flags)) + rdev->sectors = mddev->dev_sectors; +} + +/* + * Change bdev capacity of @rs in case of a disk add/remove reshape + */ +static void rs_set_capacity(struct raid_set *rs) +{ + struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table)); + + set_capacity_and_notify(gendisk, rs->md.array_sectors); +} + +/* + * Set the mddev properties in @rs to the current + * ones retrieved from the freshest superblock + */ +static void rs_set_cur(struct raid_set *rs) +{ + struct mddev *mddev = &rs->md; + + mddev->new_level = mddev->level; + mddev->new_layout = mddev->layout; + mddev->new_chunk_sectors = mddev->chunk_sectors; +} + +/* + * Set the mddev properties in @rs to the new + * ones requested by the ctr + */ +static void rs_set_new(struct raid_set *rs) { - unsigned i; + struct mddev *mddev = &rs->md; + + mddev->level = mddev->new_level; + mddev->layout = mddev->new_layout; + mddev->chunk_sectors = mddev->new_chunk_sectors; + mddev->raid_disks = rs->raid_disks; + mddev->delta_disks = 0; +} + +static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type, + unsigned int raid_devs) +{ + unsigned int i; struct raid_set *rs; if (raid_devs <= raid_type->parity_devs) { @@ -152,23 +744,31 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra return ERR_PTR(-EINVAL); } - rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); + rs = kzalloc(struct_size(rs, dev, raid_devs), GFP_KERNEL); if (!rs) { ti->error = "Cannot allocate raid context"; return ERR_PTR(-ENOMEM); } - mddev_init(&rs->md); + if (mddev_init(&rs->md)) { + kfree(rs); + ti->error = "Cannot initialize raid context"; + return ERR_PTR(-ENOMEM); + } + + rs->raid_disks = raid_devs; + rs->delta_disks = 0; rs->ti = ti; rs->raid_type = raid_type; + rs->stripe_cache_entries = 256; rs->md.raid_disks = raid_devs; rs->md.level = raid_type->level; rs->md.new_level = rs->md.level; rs->md.layout = raid_type->algorithm; rs->md.new_layout = rs->md.layout; rs->md.delta_disks = 0; - rs->md.recovery_cp = 0; + rs->md.resync_offset = MaxSector; for (i = 0; i < raid_devs; i++) md_rdev_init(&rs->dev[i].rdev); @@ -185,11 +785,17 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra return rs; } -static void context_free(struct raid_set *rs) +/* Free all @rs allocations */ +static void raid_set_free(struct raid_set *rs) { int i; - for (i = 0; i < rs->md.raid_disks; i++) { + if (rs->journal_dev.dev) { + md_rdev_clear(&rs->journal_dev.rdev); + dm_put_device(rs->ti, rs->journal_dev.dev); + } + + for (i = 0; i < rs->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); @@ -197,6 +803,7 @@ static void context_free(struct raid_set *rs) dm_put_device(rs->ti, rs->dev[i].data_dev); } + mddev_destroy(&rs->md); kfree(rs); } @@ -214,61 +821,78 @@ static void context_free(struct raid_set *rs) * <meta_dev> - * * This code parses those words. If there is a failure, - * the caller must use context_free to unwind the operations. + * the caller must use raid_set_free() to unwind the operations. */ -static int dev_parms(struct raid_set *rs, char **argv) +static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as) { int i; int rebuild = 0; int metadata_available = 0; - int ret = 0; + int r = 0; + const char *arg; + + /* Put off the number of raid devices argument to get to dev pairs */ + arg = dm_shift_arg(as); + if (!arg) + return -EINVAL; - for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { + for (i = 0; i < rs->raid_disks; i++) { 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. + * There are no offsets initially. + * Out of place reshape will set them accordingly. */ rs->dev[i].rdev.data_offset = 0; + rs->dev[i].rdev.new_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; + arg = dm_shift_arg(as); + if (!arg) + return -EINVAL; + + if (strcmp(arg, "-")) { + r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), + &rs->dev[i].meta_dev); + if (r) { + rs->ti->error = "RAID metadata device lookup failure"; + return r; + } rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); - if (!rs->dev[i].rdev.sb_page) + if (!rs->dev[i].rdev.sb_page) { + rs->ti->error = "Failed to allocate superblock page"; return -ENOMEM; + } } - if (!strcmp(argv[1], "-")) { + arg = dm_shift_arg(as); + if (!arg) + return -EINVAL; + + if (!strcmp(arg, "-")) { 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) + if (rs->dev[i].meta_dev) { + rs->ti->error = "No data device supplied with metadata device"; 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) { + r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), + &rs->dev[i].data_dev); + if (r) { rs->ti->error = "RAID device lookup failure"; - return ret; + return r; } if (rs->dev[i].meta_dev) { @@ -276,16 +900,19 @@ static int dev_parms(struct raid_set *rs, char **argv) 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); + list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks); if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) rebuild++; } + if (rs->journal_dev.dev) + list_add_tail(&rs->journal_dev.rdev.same_set, &rs->md.disks); + if (metadata_available) { rs->md.external = 0; rs->md.persistent = 1; rs->md.major_version = 2; - } else if (rebuild && !rs->md.recovery_cp) { + } else if (rebuild && !rs->md.resync_offset) { /* * Without metadata, we will not be able to tell if the array * is in-sync or not - we must assume it is not. Therefore, @@ -297,8 +924,7 @@ static int dev_parms(struct raid_set *rs, char **argv) * * 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"; + rs->ti->error = "Unable to rebuild drive while array is not in-sync"; return -EINVAL; } @@ -319,14 +945,16 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size) { unsigned long min_region_size = rs->ti->len / (1 << 21); + if (rs_is_raid0(rs)) + return 0; + if (!region_size) { /* - * Choose a reasonable default. All figures in sectors. + * 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); + region_size = roundup_pow_of_two(min_region_size); DMINFO("Choosing default region size of %lu sectors", region_size); } else { @@ -363,7 +991,7 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size) /* * Convert sectors to bytes. */ - rs->md.bitmap_info.chunksize = (region_size << 9); + rs->md.bitmap_info.chunksize = to_bytes(region_size); return 0; } @@ -379,16 +1007,19 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size) */ 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) + unsigned int i, rebuild_cnt = 0; + unsigned int rebuilds_per_group = 0, copies, raid_disks; + unsigned int group_size, last_group_start; + + for (i = 0; i < rs->raid_disks; i++) + if (!test_bit(FirstUse, &rs->dev[i].rdev.flags) && + ((!test_bit(In_sync, &rs->dev[i].rdev.flags) || + !rs->dev[i].rdev.sb_page))) rebuild_cnt++; - switch (rs->raid_type->level) { + switch (rs->md.level) { + case 0: + break; case 1: if (rebuild_cnt >= rs->md.raid_disks) goto too_many; @@ -400,7 +1031,12 @@ static int validate_raid_redundancy(struct raid_set *rs) goto too_many; break; case 10: - copies = raid10_md_layout_to_copies(rs->md.layout); + copies = raid10_md_layout_to_copies(rs->md.new_layout); + if (copies < 2) { + DMERR("Bogus raid10 data copies < 2!"); + return -EINVAL; + } + if (rebuild_cnt < copies) break; @@ -414,17 +1050,17 @@ static int validate_raid_redundancy(struct raid_set *rs) * 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 + * 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++) { + raid_disks = min(rs->raid_disks, rs->md.raid_disks); + if (__is_raid10_near(rs->md.new_layout)) { + for (i = 0; i < raid_disks; 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)) && + if ((!rs->dev[i].rdev.sb_page || + !test_bit(In_sync, &rs->dev[i].rdev.flags)) && (++rebuilds_per_group >= copies)) goto too_many; } @@ -439,20 +1075,20 @@ static int validate_raid_redundancy(struct raid_set *rs) * 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 + * 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; + group_size = (raid_disks / copies); + last_group_start = (raid_disks / group_size) - 1; last_group_start *= group_size; - for (i = 0; i < rs->md.raid_disks; i++) { + for (i = 0; i < 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; + goto too_many; } break; default: @@ -472,42 +1108,50 @@ too_many: * * Argument definitions * <chunk_size> The number of sectors per disk that - * will form the "stripe" + * will form the "stripe" * [[no]sync] Force or prevent recovery of the - * entire array + * entire array * [rebuild <idx>] Rebuild the drive indicated by the index * [daemon_sleep <ms>] Time between bitmap daemon work to - * clear bits + * 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 + * [region_size <sectors>] Defines granularity of bitmap + * [journal_dev <dev>] raid4/5/6 journaling deviice + * (i.e. write hole closing log) * * RAID10-only options: - * [raid10_copies <# copies>] Number of copies. (Default: 2) + * [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) -{ - char *raid10_format = "near"; - unsigned raid10_copies = 2; - unsigned i; - unsigned long value, region_size = 0; - sector_t sectors_per_dev = rs->ti->len; +static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, + unsigned int num_raid_params) +{ + int value, raid10_format = ALGORITHM_RAID10_DEFAULT; + unsigned int raid10_copies = 2; + unsigned int i, write_mostly = 0; + unsigned int region_size = 0; sector_t max_io_len; - char *key; + const char *arg, *key; + struct raid_dev *rd; + struct raid_type *rt = rs->raid_type; + + arg = dm_shift_arg(as); + num_raid_params--; /* Account for chunk_size argument */ + + if (kstrtoint(arg, 10, &value) < 0) { + rs->ti->error = "Bad numerical argument given for chunk_size"; + return -EINVAL; + } /* * First, parse the in-order required arguments * "chunk_size" is the only argument of this type. */ - if ((kstrtoul(argv[0], 10, &value) < 0)) { - rs->ti->error = "Bad chunk size"; - return -EINVAL; - } else if (rs->raid_type->level == 1) { + if (rt_is_raid1(rt)) { if (value) DMERR("Ignoring chunk size parameter for RAID 1"); value = 0; @@ -520,8 +1164,6 @@ static int parse_raid_params(struct raid_set *rs, char **argv, } 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 @@ -529,18 +1171,18 @@ static int parse_raid_params(struct raid_set *rs, char **argv, * replacement then one of the following cases applies: * * 1) User specifies 'rebuild'. - * - Device is reset when param is read. + * - Device is reset when param is read. * 2) A new device is supplied. - * - No matching superblock found, resets device. + * - No matching superblock found, resets device. * 3) Device failure was transient and returns on reload. - * - Failure noticed, resets device for bitmap replay. + * - Failure noticed, resets device for bitmap replay. * 4) Device hadn't completed recovery after previous failure. - * - Superblock is read and overrides recovery_offset. + * - 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->raid_disks; i++) { set_bit(In_sync, &rs->dev[i].rdev.flags); rs->dev[i].rdev.recovery_offset = MaxSector; } @@ -549,140 +1191,301 @@ static int parse_raid_params(struct raid_set *rs, char **argv, * 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; + key = dm_shift_arg(as); + if (!key) { + rs->ti->error = "Not enough raid parameters given"; + return -EINVAL; + } + + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) { + if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { + rs->ti->error = "Only one 'nosync' argument allowed"; + return -EINVAL; + } continue; } - if (!strcasecmp(argv[i], "sync")) { - rs->md.recovery_cp = 0; - rs->print_flags |= DMPF_SYNC; + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) { + if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) { + rs->ti->error = "Only one 'sync' argument allowed"; + return -EINVAL; + } + continue; + } + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) { + if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { + rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed"; + return -EINVAL; + } continue; } - /* The rest of the optional arguments come in key/value pairs */ - if ((i + 1) >= num_raid_params) { + arg = dm_shift_arg(as); + i++; /* Account for the argument pairs */ + if (!arg) { rs->ti->error = "Wrong number of raid parameters given"; return -EINVAL; } - key = argv[i++]; - - /* Parameters that take a string value are checked here. */ - if (!strcasecmp(key, "raid10_format")) { - if (rs->raid_type->level != 10) { + /* + * Parameters that take a string value are checked here. + */ + /* "raid10_format {near|offset|far} */ + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) { + if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) { + rs->ti->error = "Only one 'raid10_format' argument pair allowed"; + return -EINVAL; + } + if (!rt_is_raid10(rt)) { 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])) { + raid10_format = raid10_name_to_format(arg); + if (raid10_format < 0) { rs->ti->error = "Invalid 'raid10_format' value given"; + return raid10_format; + } + continue; + } + + /* "journal_dev <dev>" */ + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) { + int r; + struct md_rdev *jdev; + + if (test_and_set_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { + rs->ti->error = "Only one raid4/5/6 set journaling device allowed"; return -EINVAL; } - raid10_format = argv[i]; - rs->print_flags |= DMPF_RAID10_FORMAT; + if (!rt_is_raid456(rt)) { + rs->ti->error = "'journal_dev' is an invalid parameter for this RAID type"; + return -EINVAL; + } + r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), + &rs->journal_dev.dev); + if (r) { + rs->ti->error = "raid4/5/6 journal device lookup failure"; + return r; + } + jdev = &rs->journal_dev.rdev; + md_rdev_init(jdev); + jdev->mddev = &rs->md; + jdev->bdev = rs->journal_dev.dev->bdev; + jdev->sectors = bdev_nr_sectors(jdev->bdev); + if (jdev->sectors < MIN_RAID456_JOURNAL_SPACE) { + rs->ti->error = "No space for raid4/5/6 journal"; + return -ENOSPC; + } + rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH; + set_bit(Journal, &jdev->flags); continue; } - if (kstrtoul(argv[i], 10, &value) < 0) { + /* "journal_mode <mode>" ("journal_dev" mandatory!) */ + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) { + int r; + + if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { + rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'"; + return -EINVAL; + } + if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) { + rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed"; + return -EINVAL; + } + r = dm_raid_journal_mode_to_md(arg); + if (r < 0) { + rs->ti->error = "Invalid 'journal_mode' argument"; + return r; + } + rs->journal_dev.mode = r; + continue; + } + + /* + * Parameters with number values from here on. + */ + if (kstrtoint(arg, 10, &value) < 0) { rs->ti->error = "Bad numerical argument given in raid params"; return -EINVAL; } - /* Parameters that take a numeric value are checked here */ - if (!strcasecmp(key, "rebuild")) { - if (value >= rs->md.raid_disks) { + if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) { + /* + * "rebuild" is being passed in by userspace to provide + * indexes of replaced devices and to set up additional + * devices on raid level takeover. + */ + if (!__within_range(value, 0, rs->raid_disks - 1)) { 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) { + + if (test_and_set_bit(value, (void *) rs->rebuild_disks)) { + rs->ti->error = "rebuild for this index already given"; + return -EINVAL; + } + + rd = rs->dev + value; + clear_bit(In_sync, &rd->rdev.flags); + clear_bit(Faulty, &rd->rdev.flags); + rd->rdev.recovery_offset = 0; + set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags); + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) { + if (!rt_is_raid1(rt)) { 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"; + + if (!__within_range(value, 0, rs->md.raid_disks - 1)) { + rs->ti->error = "Invalid write_mostly index given"; return -EINVAL; } + + write_mostly++; set_bit(WriteMostly, &rs->dev[value].rdev.flags); - } else if (!strcasecmp(key, "max_write_behind")) { - if (rs->raid_type->level != 1) { + set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags); + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) { + if (!rt_is_raid1(rt)) { 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) { + if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) { + rs->ti->error = "Only one max_write_behind argument pair allowed"; + return -EINVAL; + } + + if (value < 0) { 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->md.bitmap_info.max_write_behind = value / 2; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) { + if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) { + rs->ti->error = "Only one daemon_sleep argument pair allowed"; + return -EINVAL; + } + if (value < 0) { 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; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) { + /* Userspace passes new data_offset after having extended the data image LV */ + if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) { + rs->ti->error = "Only one data_offset argument pair allowed"; + return -EINVAL; + } + /* Ensure sensible data offset */ + if (value < 0 || + (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) { + rs->ti->error = "Bogus data_offset value"; + return -EINVAL; + } + rs->data_offset = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) { + /* Define the +/-# of disks to add to/remove from the given raid set */ + if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { + rs->ti->error = "Only one delta_disks argument pair allowed"; + return -EINVAL; + } + /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */ + if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) { + rs->ti->error = "Too many delta_disk requested"; + return -EINVAL; + } - /* - * In device-mapper, we specify things in sectors, but - * MD records this value in kB - */ - value /= 2; + rs->delta_disks = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) { + if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) { + rs->ti->error = "Only one stripe_cache argument pair allowed"; + return -EINVAL; + } - if ((rs->raid_type->level != 5) && - (rs->raid_type->level != 6)) { + if (!rt_is_raid456(rt)) { 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"; + + if (value < 0) { + rs->ti->error = "Bogus stripe cache entries value"; + return -EINVAL; + } + rs->stripe_cache_entries = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) { + if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) { + rs->ti->error = "Only one min_recovery_rate argument pair allowed"; return -EINVAL; } - } else if (!strcasecmp(key, "min_recovery_rate")) { - rs->print_flags |= DMPF_MIN_RECOVERY_RATE; - if (value > INT_MAX) { + + if (value < 0) { 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->md.sync_speed_min = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) { + if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) { + rs->ti->error = "Only one max_recovery_rate argument pair allowed"; + return -EINVAL; + } + + if (value < 0) { 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; + rs->md.sync_speed_max = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) { + if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) { + rs->ti->error = "Only one region_size argument pair allowed"; + return -EINVAL; + } + region_size = value; - } else if (!strcasecmp(key, "raid10_copies") && - (rs->raid_type->level == 10)) { - if ((value < 2) || (value > 0xFF)) { + rs->requested_bitmap_chunk_sectors = value; + } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) { + if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) { + rs->ti->error = "Only one raid10_copies argument pair allowed"; + return -EINVAL; + } + + if (!__within_range(value, 2, rs->md.raid_disks)) { 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"; + rs->ti->error = "Unable to parse RAID parameter"; return -EINVAL; } } + if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) && + test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { + rs->ti->error = "sync and nosync are mutually exclusive"; + return -EINVAL; + } + + if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) && + (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) || + test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) { + rs->ti->error = "sync/nosync and rebuild are mutually exclusive"; + return -EINVAL; + } + + if (write_mostly >= rs->md.raid_disks) { + rs->ti->error = "Can't set all raid1 devices to write_mostly"; + return -EINVAL; + } + + if (rs->md.sync_speed_max && + rs->md.sync_speed_min > rs->md.sync_speed_max) { + rs->ti->error = "Bogus recovery rates"; + return -EINVAL; + } + if (validate_region_size(rs, region_size)) return -EINVAL; @@ -694,63 +1497,455 @@ static int parse_raid_params(struct raid_set *rs, char **argv, if (dm_set_target_max_io_len(rs->ti, max_io_len)) return -EINVAL; - if (rs->raid_type->level == 10) { + if (rt_is_raid10(rt)) { 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; + rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies); + if (rs->md.new_layout < 0) { + rs->ti->error = "Error getting raid10 format"; + return rs->md.new_layout; } - /* (Len * #mirrors) / #devices */ - sectors_per_dev = rs->ti->len * raid10_copies; - sector_div(sectors_per_dev, rs->md.raid_disks); + rt = get_raid_type_by_ll(10, rs->md.new_layout); + if (!rt) { + rs->ti->error = "Failed to recognize new raid10 layout"; + return -EINVAL; + } - 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; + if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT || + rt->algorithm == ALGORITHM_RAID10_NEAR) && + test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { + rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible"; + return -EINVAL; + } } - rs->md.dev_sectors = sectors_per_dev; + + rs->raid10_copies = raid10_copies; /* Assume there are no metadata devices until the drives are parsed */ rs->md.persistent = 0; rs->md.external = 1; + /* Check, if any invalid ctr arguments have been passed in for the raid level */ + return rs_check_for_valid_flags(rs); +} + +/* Set raid4/5/6 cache size */ +static int rs_set_raid456_stripe_cache(struct raid_set *rs) +{ + int r; + struct r5conf *conf; + struct mddev *mddev = &rs->md; + uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2; + uint32_t nr_stripes = rs->stripe_cache_entries; + + if (!rt_is_raid456(rs->raid_type)) { + rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size"; + return -EINVAL; + } + + if (nr_stripes < min_stripes) { + DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size", + nr_stripes, min_stripes); + nr_stripes = min_stripes; + } + + conf = mddev->private; + if (!conf) { + rs->ti->error = "Cannot change stripe_cache size on inactive RAID set"; + return -EINVAL; + } + + /* Try setting number of stripes in raid456 stripe cache */ + if (conf->min_nr_stripes != nr_stripes) { + r = raid5_set_cache_size(mddev, nr_stripes); + if (r) { + rs->ti->error = "Failed to set raid4/5/6 stripe cache size"; + return r; + } + + DMINFO("%u stripe cache entries", nr_stripes); + } + return 0; } +/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */ +static unsigned int mddev_data_stripes(struct raid_set *rs) +{ + return rs->md.raid_disks - rs->raid_type->parity_devs; +} + +/* Return # of data stripes of @rs (i.e. as of ctr) */ +static unsigned int rs_data_stripes(struct raid_set *rs) +{ + return rs->raid_disks - rs->raid_type->parity_devs; +} + +/* + * Retrieve rdev->sectors from any valid raid device of @rs + * to allow userpace to pass in arbitray "- -" device tupples. + */ +static sector_t __rdev_sectors(struct raid_set *rs) +{ + int i; + + for (i = 0; i < rs->raid_disks; i++) { + struct md_rdev *rdev = &rs->dev[i].rdev; + + if (!test_bit(Journal, &rdev->flags) && + rdev->bdev && rdev->sectors) + return rdev->sectors; + } + + return 0; +} + +/* Check that calculated dev_sectors fits all component devices. */ +static int _check_data_dev_sectors(struct raid_set *rs) +{ + sector_t ds = ~0; + struct md_rdev *rdev; + + rdev_for_each(rdev, &rs->md) + if (!test_bit(Journal, &rdev->flags) && rdev->bdev) { + ds = min(ds, bdev_nr_sectors(rdev->bdev)); + if (ds < rs->md.dev_sectors) { + rs->ti->error = "Component device(s) too small"; + return -EINVAL; + } + } + + return 0; +} + +/* Get reshape sectors from data_offsets or raid set */ +static sector_t _get_reshape_sectors(struct raid_set *rs) +{ + struct md_rdev *rdev; + sector_t reshape_sectors = 0; + + rdev_for_each(rdev, &rs->md) + if (!test_bit(Journal, &rdev->flags)) { + reshape_sectors = (rdev->data_offset > rdev->new_data_offset) ? + rdev->data_offset - rdev->new_data_offset : + rdev->new_data_offset - rdev->data_offset; + break; + } + + return max(reshape_sectors, (sector_t) rs->data_offset); +} + +/* Calculate the sectors per device and per array used for @rs */ +static int rs_set_dev_and_array_sectors(struct raid_set *rs, sector_t sectors, bool use_mddev) +{ + int delta_disks; + unsigned int data_stripes; + sector_t array_sectors = sectors, dev_sectors = sectors; + struct mddev *mddev = &rs->md; + + if (use_mddev) { + delta_disks = mddev->delta_disks; + data_stripes = mddev_data_stripes(rs); + } else { + delta_disks = rs->delta_disks; + data_stripes = rs_data_stripes(rs); + } + + /* Special raid1 case w/o delta_disks support (yet) */ + if (rt_is_raid1(rs->raid_type)) + ; + else if (rt_is_raid10(rs->raid_type)) { + if (rs->raid10_copies < 2 || + delta_disks < 0) { + rs->ti->error = "Bogus raid10 data copies or delta disks"; + return -EINVAL; + } + + dev_sectors *= rs->raid10_copies; + if (sector_div(dev_sectors, data_stripes)) + goto bad; + + array_sectors = (data_stripes + delta_disks) * (dev_sectors - _get_reshape_sectors(rs)); + if (sector_div(array_sectors, rs->raid10_copies)) + goto bad; + + } else if (sector_div(dev_sectors, data_stripes)) + goto bad; + + else + /* Striped layouts */ + array_sectors = (data_stripes + delta_disks) * (dev_sectors - _get_reshape_sectors(rs)); + + mddev->array_sectors = array_sectors; + mddev->dev_sectors = dev_sectors; + rs_set_rdev_sectors(rs); + + return _check_data_dev_sectors(rs); +bad: + rs->ti->error = "Target length not divisible by number of data devices"; + return -EINVAL; +} + +/* Setup recovery on @rs */ +static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors) +{ + /* raid0 does not recover */ + if (rs_is_raid0(rs)) + rs->md.resync_offset = MaxSector; + /* + * A raid6 set has to be recovered either + * completely or for the grown part to + * ensure proper parity and Q-Syndrome + */ + else if (rs_is_raid6(rs)) + rs->md.resync_offset = dev_sectors; + /* + * Other raid set types may skip recovery + * depending on the 'nosync' flag. + */ + else + rs->md.resync_offset = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags) + ? MaxSector : dev_sectors; +} + static void do_table_event(struct work_struct *ws) { struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); + smp_rmb(); /* Make sure we access most actual mddev properties */ + + /* Only grow size resulting from added stripe(s) after reshape ended. */ + if (!rs_is_reshaping(rs) && + rs->array_sectors > rs->md.array_sectors && + !rs->md.delta_disks && + rs->md.raid_disks == rs->raid_disks) { + /* The raid10 personality doesn't provide proper device sizes -> correct. */ + if (rs_is_raid10(rs)) + rs_set_rdev_sectors(rs); + + rs->md.array_sectors = rs->array_sectors; + rs_set_capacity(rs); + } + dm_table_event(rs->ti->table); } -static int raid_is_congested(struct dm_target_callbacks *cb, int bits) +/* + * Make sure a valid takover (level switch) is being requested on @rs + * + * Conversions of raid sets from one MD personality to another + * have to conform to restrictions which are enforced here. + */ +static int rs_check_takeover(struct raid_set *rs) { - struct raid_set *rs = container_of(cb, struct raid_set, callbacks); + struct mddev *mddev = &rs->md; + unsigned int near_copies; + + if (rs->md.degraded) { + rs->ti->error = "Can't takeover degraded raid set"; + return -EPERM; + } + + if (rs_is_reshaping(rs)) { + rs->ti->error = "Can't takeover reshaping raid set"; + return -EPERM; + } + + switch (mddev->level) { + case 0: + /* raid0 -> raid1/5 with one disk */ + if ((mddev->new_level == 1 || mddev->new_level == 5) && + mddev->raid_disks == 1) + return 0; + + /* raid0 -> raid10 */ + if (mddev->new_level == 10 && + !(rs->raid_disks % mddev->raid_disks)) + return 0; + + /* raid0 with multiple disks -> raid4/5/6 */ + if (__within_range(mddev->new_level, 4, 6) && + mddev->new_layout == ALGORITHM_PARITY_N && + mddev->raid_disks > 1) + return 0; + + break; + + case 10: + /* Can't takeover raid10_offset! */ + if (__is_raid10_offset(mddev->layout)) + break; - if (rs->raid_type->level == 1) - return md_raid1_congested(&rs->md, bits); + near_copies = __raid10_near_copies(mddev->layout); - if (rs->raid_type->level == 10) - return md_raid10_congested(&rs->md, bits); + /* raid10* -> raid0 */ + if (mddev->new_level == 0) { + /* Can takeover raid10_near with raid disks divisable by data copies! */ + if (near_copies > 1 && + !(mddev->raid_disks % near_copies)) { + mddev->raid_disks /= near_copies; + mddev->delta_disks = mddev->raid_disks; + return 0; + } - return md_raid5_congested(&rs->md, bits); + /* Can takeover raid10_far */ + if (near_copies == 1 && + __raid10_far_copies(mddev->layout) > 1) + return 0; + + break; + } + + /* raid10_{near,far} -> raid1 */ + if (mddev->new_level == 1 && + max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks) + return 0; + + /* raid10_{near,far} with 2 disks -> raid4/5 */ + if (__within_range(mddev->new_level, 4, 5) && + mddev->raid_disks == 2) + return 0; + break; + + case 1: + /* raid1 with 2 disks -> raid4/5 */ + if (__within_range(mddev->new_level, 4, 5) && + mddev->raid_disks == 2) { + mddev->degraded = 1; + return 0; + } + + /* raid1 -> raid0 */ + if (mddev->new_level == 0 && + mddev->raid_disks == 1) + return 0; + + /* raid1 -> raid10 */ + if (mddev->new_level == 10) + return 0; + break; + + case 4: + /* raid4 -> raid0 */ + if (mddev->new_level == 0) + return 0; + + /* raid4 -> raid1/5 with 2 disks */ + if ((mddev->new_level == 1 || mddev->new_level == 5) && + mddev->raid_disks == 2) + return 0; + + /* raid4 -> raid5/6 with parity N */ + if (__within_range(mddev->new_level, 5, 6) && + mddev->layout == ALGORITHM_PARITY_N) + return 0; + break; + + case 5: + /* raid5 with parity N -> raid0 */ + if (mddev->new_level == 0 && + mddev->layout == ALGORITHM_PARITY_N) + return 0; + + /* raid5 with parity N -> raid4 */ + if (mddev->new_level == 4 && + mddev->layout == ALGORITHM_PARITY_N) + return 0; + + /* raid5 with 2 disks -> raid1/4/10 */ + if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) && + mddev->raid_disks == 2) + return 0; + + /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */ + if (mddev->new_level == 6 && + ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || + __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6))) + return 0; + break; + + case 6: + /* raid6 with parity N -> raid0 */ + if (mddev->new_level == 0 && + mddev->layout == ALGORITHM_PARITY_N) + return 0; + + /* raid6 with parity N -> raid4 */ + if (mddev->new_level == 4 && + mddev->layout == ALGORITHM_PARITY_N) + return 0; + + /* raid6_*_n with Q-Syndrome N -> raid5_* */ + if (mddev->new_level == 5 && + ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || + __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC))) + return 0; + break; + + default: + break; + } + + rs->ti->error = "takeover not possible"; + return -EINVAL; +} + +/* True if @rs requested to be taken over */ +static bool rs_takeover_requested(struct raid_set *rs) +{ + return rs->md.new_level != rs->md.level; } +/* True if layout is set to reshape. */ +static bool rs_is_layout_change(struct raid_set *rs, bool use_mddev) +{ + return (use_mddev ? rs->md.delta_disks : rs->delta_disks) || + rs->md.new_layout != rs->md.layout || + rs->md.new_chunk_sectors != rs->md.chunk_sectors; +} + +/* True if @rs is requested to reshape by ctr */ +static bool rs_reshape_requested(struct raid_set *rs) +{ + bool change; + struct mddev *mddev = &rs->md; + + if (rs_takeover_requested(rs)) + return false; + + if (rs_is_raid0(rs)) + return false; + + change = rs_is_layout_change(rs, false); + + /* Historical case to support raid1 reshape without delta disks */ + if (rs_is_raid1(rs)) { + if (rs->delta_disks) + return !!rs->delta_disks; + + return !change && + mddev->raid_disks != rs->raid_disks; + } + + if (rs_is_raid10(rs)) + return change && + !__is_raid10_far(mddev->new_layout) && + rs->delta_disks >= 0; + + return change; +} + +/* Features */ +#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */ + +/* State flags for sb->flags */ +#define SB_FLAG_RESHAPE_ACTIVE 0x1 +#define SB_FLAG_RESHAPE_BACKWARDS 0x2 + /* * This structure is never routinely used by userspace, unlike md superblocks. * Devices with this superblock should only ever be accessed via device-mapper. @@ -758,13 +1953,14 @@ static int raid_is_congested(struct dm_target_callbacks *cb, int bits) #define DM_RAID_MAGIC 0x64526D44 struct dm_raid_superblock { __le32 magic; /* "DmRd" */ - __le32 features; /* Used to indicate possible future changes */ + __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */ - __le32 num_devices; /* Number of devices in this array. (Max 64) */ - __le32 array_position; /* The position of this drive in the array */ + __le32 num_devices; /* Number of devices in this raid set. (Max 64) */ + __le32 array_position; /* The position of this drive in the raid set */ __le64 events; /* Incremented by md when superblock updated */ - __le64 failed_devices; /* Bit field of devices to indicate failures */ + __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */ + /* indicate failures (see extension below) */ /* * This offset tracks the progress of the repair or replacement of @@ -773,34 +1969,110 @@ struct dm_raid_superblock { __le64 disk_recovery_offset; /* - * This offset tracks the progress of the initial array + * This offset tracks the progress of the initial raid set * synchronisation/parity calculation. */ __le64 array_resync_offset; /* - * RAID characteristics + * raid characteristics */ __le32 level; __le32 layout; __le32 stripe_sectors; - __u8 pad[452]; /* Round struct to 512 bytes. */ - /* Always set to 0 when writing. */ + /******************************************************************** + * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!! + * + * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist + */ + + __le32 flags; /* Flags defining array states for reshaping */ + + /* + * This offset tracks the progress of a raid + * set reshape in order to be able to restart it + */ + __le64 reshape_position; + + /* + * These define the properties of the array in case of an interrupted reshape + */ + __le32 new_level; + __le32 new_layout; + __le32 new_stripe_sectors; + __le32 delta_disks; + + __le64 array_sectors; /* Array size in sectors */ + + /* + * Sector offsets to data on devices (reshaping). + * Needed to support out of place reshaping, thus + * not writing over any stripes whilst converting + * them from old to new layout + */ + __le64 data_offset; + __le64 new_data_offset; + + __le64 sectors; /* Used device size in sectors */ + + /* + * Additional Bit field of devices indicating failures to support + * up to 256 devices with the 1.9.0 on-disk metadata format + */ + __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1]; + + __le32 incompat_features; /* Used to indicate any incompatible features */ + + /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */ } __packed; -static int read_disk_sb(struct md_rdev *rdev, int size) +/* + * Check for reshape constraints on raid set @rs: + * + * - reshape function non-existent + * - degraded set + * - ongoing recovery + * - ongoing reshape + * + * Returns 0 if none or -EPERM if given constraint + * and error message reference in @errmsg + */ +static int rs_check_reshape(struct raid_set *rs) +{ + struct mddev *mddev = &rs->md; + + if (!mddev->pers || !mddev->pers->check_reshape) + rs->ti->error = "Reshape not supported"; + else if (mddev->degraded) + rs->ti->error = "Can't reshape degraded raid set"; + else if (rs_is_recovering(rs)) + rs->ti->error = "Convert request on recovering raid set prohibited"; + else if (rs_is_reshaping(rs)) + rs->ti->error = "raid set already reshaping!"; + else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs))) + rs->ti->error = "Reshaping only supported for raid1/4/5/6/10"; + else + return 0; + + return -EPERM; +} + +static int read_disk_sb(struct md_rdev *rdev, int size, bool force_reload) { BUG_ON(!rdev->sb_page); - if (rdev->sb_loaded) + if (rdev->sb_loaded && !force_reload) return 0; - if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { + rdev->sb_loaded = 0; + + if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true)) { DMERR("Failed to read superblock of device at position %d", rdev->raid_disk); md_error(rdev->mddev, rdev); - return -EINVAL; + set_bit(Faulty, &rdev->flags); + return -EIO; } rdev->sb_loaded = 1; @@ -808,38 +2080,107 @@ static int read_disk_sb(struct md_rdev *rdev, int size) return 0; } +static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) +{ + failed_devices[0] = le64_to_cpu(sb->failed_devices); + memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices)); + + if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { + int i = ARRAY_SIZE(sb->extended_failed_devices); + + while (i--) + failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]); + } +} + +static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) +{ + int i = ARRAY_SIZE(sb->extended_failed_devices); + + sb->failed_devices = cpu_to_le64(failed_devices[0]); + while (i--) + sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]); +} + +/* + * Synchronize the superblock members with the raid set properties + * + * All superblock data is little endian. + */ static void super_sync(struct mddev *mddev, struct md_rdev *rdev) { - int i; - uint64_t failed_devices; + bool update_failed_devices = false; + unsigned int i; + uint64_t failed_devices[DISKS_ARRAY_ELEMS]; struct dm_raid_superblock *sb; struct raid_set *rs = container_of(mddev, struct raid_set, md); + /* No metadata device, no superblock */ + if (!rdev->meta_bdev) + return; + + BUG_ON(!rdev->sb_page); + 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); + sb_retrieve_failed_devices(sb, failed_devices); - memset(sb, 0, sizeof(*sb)); + for (i = 0; i < rs->raid_disks; i++) + if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) { + update_failed_devices = true; + set_bit(i, (void *) failed_devices); + } + + if (update_failed_devices) + sb_update_failed_devices(sb, failed_devices); sb->magic = cpu_to_le32(DM_RAID_MAGIC); - sb->features = cpu_to_le32(0); /* No features yet */ + sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); 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->array_resync_offset = cpu_to_le64(mddev->resync_offset); sb->level = cpu_to_le32(mddev->level); sb->layout = cpu_to_le32(mddev->layout); sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); + + /******************************************************************** + * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!! + * + * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist + */ + sb->new_level = cpu_to_le32(mddev->new_level); + sb->new_layout = cpu_to_le32(mddev->new_layout); + sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors); + + sb->delta_disks = cpu_to_le32(mddev->delta_disks); + + smp_rmb(); /* Make sure we access most recent reshape position */ + sb->reshape_position = cpu_to_le64(mddev->reshape_position); + if (le64_to_cpu(sb->reshape_position) != MaxSector) { + /* Flag ongoing reshape */ + sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE); + + if (mddev->delta_disks < 0 || mddev->reshape_backwards) + sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS); + } else { + /* Clear reshape flags */ + sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS)); + } + + sb->array_sectors = cpu_to_le64(mddev->array_sectors); + sb->data_offset = cpu_to_le64(rdev->data_offset); + sb->new_data_offset = cpu_to_le64(rdev->new_data_offset); + sb->sectors = cpu_to_le64(rdev->sectors); + sb->incompat_features = cpu_to_le32(0); + + /* Zero out the rest of the payload after the size of the superblock */ + memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); } /* @@ -852,17 +2193,14 @@ static void super_sync(struct mddev *mddev, struct md_rdev *rdev) */ static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) { - int ret; + int r; 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; + r = read_disk_sb(rdev, rdev->sb_size, false); + if (r) + return r; sb = page_address(rdev->sb_page); @@ -876,9 +2214,10 @@ static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) super_sync(rdev->mddev, rdev); set_bit(FirstUse, &rdev->flags); + sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); /* Force writing of superblocks to disk */ - set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); + set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags); /* Any superblock is better than none, choose that if given */ return refdev ? 0 : 1; @@ -895,129 +2234,219 @@ static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) return (events_sb > events_refsb) ? 1 : 0; } -static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) +static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev) { int role; - struct raid_set *rs = container_of(mddev, struct raid_set, md); + struct mddev *mddev = &rs->md; uint64_t events_sb; - uint64_t failed_devices; + uint64_t failed_devices[DISKS_ARRAY_ELEMS]; struct dm_raid_superblock *sb; - uint32_t new_devs = 0; - uint32_t rebuilds = 0; + uint32_t new_devs = 0, rebuild_and_new = 0, 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; + mddev->reshape_position = MaxSector; + + mddev->raid_disks = le32_to_cpu(sb->num_devices); + mddev->level = le32_to_cpu(sb->level); + mddev->layout = le32_to_cpu(sb->layout); + mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors); + /* - * Reshaping is not currently allowed + * Reshaping is supported, e.g. reshape_position is valid + * in superblock and superblock content is authoritative. */ - 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; - } + if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { + /* Superblock is authoritative wrt given raid set layout! */ + mddev->new_level = le32_to_cpu(sb->new_level); + mddev->new_layout = le32_to_cpu(sb->new_layout); + mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors); + mddev->delta_disks = le32_to_cpu(sb->delta_disks); + mddev->array_sectors = le64_to_cpu(sb->array_sectors); + + /* raid was reshaping and got interrupted */ + if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) { + if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { + DMERR("Reshape requested but raid set is still reshaping"); + 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 (mddev->delta_disks < 0 || + (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS))) + mddev->reshape_backwards = 1; + else + mddev->reshape_backwards = 0; + + mddev->reshape_position = le64_to_cpu(sb->reshape_position); + rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout); + } + + } else { + /* + * No takeover/reshaping, because we don't have the extended v1.9.0 metadata + */ + struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout); + struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); + + if (rs_takeover_requested(rs)) { + if (rt_cur && rt_new) + DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)", + rt_cur->name, rt_new->name); + else + DMERR("Takeover raid sets not yet supported by metadata. (raid level change)"); + return -EINVAL; + } else if (rs_reshape_requested(rs)) { + DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)"); + if (mddev->layout != mddev->new_layout) { + if (rt_cur && rt_new) + DMERR(" current layout %s vs new layout %s", + rt_cur->name, rt_new->name); + else + DMERR(" current layout 0x%X vs new layout 0x%X", + le32_to_cpu(sb->layout), mddev->new_layout); + } + if (mddev->chunk_sectors != mddev->new_chunk_sectors) + DMERR(" current stripe sectors %u vs new stripe sectors %u", + mddev->chunk_sectors, mddev->new_chunk_sectors); + if (rs->delta_disks) + DMERR(" current %u disks vs new %u disks", + mddev->raid_disks, mddev->raid_disks + rs->delta_disks); + if (rs_is_raid10(rs)) { + DMERR(" Old layout: %s w/ %u copies", + raid10_md_layout_to_format(mddev->layout), + raid10_md_layout_to_copies(mddev->layout)); + DMERR(" New layout: %s w/ %u copies", + raid10_md_layout_to_format(mddev->new_layout), + raid10_md_layout_to_copies(mddev->new_layout)); + } + return -EINVAL; + } + + DMINFO("Discovered old metadata format; upgrading to extended metadata format"); } - if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) - mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); + if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) + mddev->resync_offset = 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 + * 1) The raid set is brand new - in which case, all of the + * devices must have their In_sync bit set. Also, + * resync_offset must be 0, unless forced. + * 2) This is a new device being added to an old raid set * 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. + * resync_offset must be MaxSector. + * 3) This is/are a new device(s) being added to an old + * raid set during takeover to a higher raid level + * to provide capacity for redundancy or during reshape + * to add capacity to grow the raid set. */ rdev_for_each(r, mddev) { + if (test_bit(Journal, &rdev->flags)) + continue; + + if (test_bit(FirstUse, &r->flags)) + new_devs++; + if (!test_bit(In_sync, &r->flags)) { - DMINFO("Device %d specified for rebuild: " - "Clearing superblock", r->raid_disk); + DMINFO("Device %d specified for rebuild; clearing superblock", + r->raid_disk); rebuilds++; - } else if (test_bit(FirstUse, &r->flags)) - new_devs++; + + if (test_bit(FirstUse, &r->flags)) + rebuild_and_new++; + } } - if (!rebuilds) { - if (new_devs == mddev->raid_disks) { - DMINFO("Superblocks created for new array"); + if (new_devs == rs->raid_disks || !rebuilds) { + /* Replace a broken device */ + if (new_devs == rs->raid_disks) { + DMINFO("Superblocks created for new raid set"); set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); - } else if (new_devs) { - DMERR("New device injected " - "into existing array without 'rebuild' " - "parameter specified"); + } else if (new_devs != rebuilds && + new_devs != rs->delta_disks) { + DMERR("New device injected into existing raid set without " + "'delta_disks' or '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"); + } else if (new_devs && new_devs != rebuilds) { + DMERR("%u 'rebuild' devices cannot be injected into" + " a raid set with %u other first-time devices", + rebuilds, new_devs); return -EINVAL; + } else if (rebuilds) { + if (rebuild_and_new && rebuilds != rebuild_and_new) { + DMERR("new device%s provided without 'rebuild'", + new_devs > 1 ? "s" : ""); + return -EINVAL; + } else if (!test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) && rs_is_recovering(rs)) { + DMERR("'rebuild' specified while raid set is not in-sync (resync_offset=%llu)", + (unsigned long long) mddev->resync_offset); + return -EINVAL; + } else if (rs_is_reshaping(rs)) { + DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)", + (unsigned long long) mddev->reshape_position); + return -EINVAL; + } } /* * Now we set the Faulty bit for those devices that are * recorded in the superblock as failed. */ + sb_retrieve_failed_devices(sb, failed_devices); rdev_for_each(r, mddev) { - if (!r->sb_page) + if (test_bit(Journal, &r->flags) || + !r->sb_page) continue; sb2 = page_address(r->sb_page); sb2->failed_devices = 0; + memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices)); /* * 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 < 0) + continue; + if (role != r->raid_disk) { - if (rs->raid_type->level != 1) { - rs->ti->error = "Cannot change device " - "positions in RAID array"; + if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) { + if (mddev->raid_disks % __raid10_near_copies(mddev->layout) || + rs->raid_disks % rs->raid10_copies) { + rs->ti->error = + "Cannot change raid10 near set to odd # of devices!"; + return -EINVAL; + } + + sb2->array_position = cpu_to_le32(r->raid_disk); + + } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) && + !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) && + !rt_is_raid1(rs->raid_type)) { + rs->ti->error = "Cannot change device positions in raid set"; return -EINVAL; } - DMINFO("RAID1 device #%d now at position #%d", - role, r->raid_disk); + + DMINFO("raid device #%d now at position #%d", role, r->raid_disk); } /* * Partial recovery is performed on * returning failed devices. */ - if (failed_devices & (1 << role)) + if (test_bit(role, (void *) failed_devices)) set_bit(Faulty, &r->flags); } } @@ -1025,36 +2454,70 @@ static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) return 0; } -static int super_validate(struct mddev *mddev, struct md_rdev *rdev) +static int super_validate(struct raid_set *rs, struct md_rdev *rdev) { - struct dm_raid_superblock *sb = page_address(rdev->sb_page); + struct mddev *mddev = &rs->md; + struct dm_raid_superblock *sb; + + if (rs_is_raid0(rs) || !rdev->sb_page || rdev->raid_disk < 0) + return 0; + + 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)) + if (!mddev->events && super_init_validation(rs, 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)) { + if (le32_to_cpu(sb->compat_features) && + le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) { + rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags"; + return -EINVAL; + } + + if (sb->incompat_features) { + rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet"; + return -EINVAL; + } + + /* Enable bitmap creation on @rs unless no metadevs or raid0 or journaled raid4/5/6 set. */ + mddev->bitmap_info.offset = (rt_is_raid0(rs->raid_type) || rs->journal_dev.dev) ? 0 : to_sector(4096); + mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; + + if (!test_and_clear_bit(FirstUse, &rdev->flags)) { + /* + * Retrieve rdev size stored in superblock to be prepared for shrink. + * Check extended superblock members are present otherwise the size + * will not be set! + */ + if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) + rdev->sectors = le64_to_cpu(sb->sectors); + rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); - if (rdev->recovery_offset != MaxSector) - clear_bit(In_sync, &rdev->flags); + if (rdev->recovery_offset == MaxSector) + set_bit(In_sync, &rdev->flags); + /* + * If no reshape in progress -> we're recovering single + * disk(s) and have to set the device(s) to out-of-sync + */ + else if (!rs_is_reshaping(rs)) + clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */ } /* * 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); + if (test_and_clear_bit(Faulty, &rdev->flags)) { + rdev->recovery_offset = 0; clear_bit(In_sync, &rdev->flags); rdev->saved_raid_disk = rdev->raid_disk; - rdev->recovery_offset = 0; } - clear_bit(FirstUse, &rdev->flags); + /* Reshape support -> restore respective data offsets */ + rdev->data_offset = le64_to_cpu(sb->data_offset); + rdev->new_data_offset = le64_to_cpu(sb->new_data_offset); return 0; } @@ -1064,209 +2527,813 @@ static int super_validate(struct mddev *mddev, struct md_rdev *rdev) */ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) { - int ret; - struct raid_dev *dev; - struct md_rdev *rdev, *tmp, *freshest; + int r; + struct md_rdev *rdev, *freshest; struct mddev *mddev = &rs->md; + /* Respect resynchronization requested with "sync" argument. */ + if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) + set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); + freshest = NULL; - rdev_for_each_safe(rdev, tmp, mddev) { + rdev_for_each(rdev, mddev) { + if (test_bit(Journal, &rdev->flags)) + continue; + + if (!rdev->meta_bdev) + continue; + + /* Set superblock offset/size for metadata device. */ + rdev->sb_start = 0; + rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); + if (rdev->sb_size < sizeof(struct dm_raid_superblock) || rdev->sb_size > PAGE_SIZE) { + DMERR("superblock size of a logical block is no longer valid"); + return -EINVAL; + } + /* - * Skipping super_load due to DMPF_SYNC will cause + * Skipping super_load due to CTR_FLAG_SYNC will cause * the array to undergo initialization again as - * though it were new. This is the intended effect + * 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. + * With reshaping capability added, we must ensure that + * the "sync" directive is disallowed during the reshape. */ - if (rs->print_flags & DMPF_SYNC) - continue; - - if (!rdev->meta_bdev) + if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) continue; - ret = super_load(rdev, freshest); + r = super_load(rdev, freshest); - switch (ret) { + switch (r) { 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; - + /* This is a failure to read the superblock from the metadata device. */ /* - * 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. + * We have to keep any raid0 data/metadata device pairs or + * the MD raid0 personality will fail to start the array. */ - if (dev->data_dev) - dm_put_device(ti, dev->data_dev); - - dev->data_dev = NULL; - rdev->bdev = NULL; + if (rs_is_raid0(rs)) + continue; - list_del(&rdev->same_set); + /* + * We keep the dm_devs to be able to emit the device tuple + * properly on the table line in raid_status() (rather than + * mistakenly acting as if '- -' got passed into the constructor). + * + * The rdev has to stay on the same_set list to allow for + * the attempt to restore faulty devices on second resume. + */ + rdev->raid_disk = rdev->saved_raid_disk = -1; + break; } } if (!freshest) return 0; + /* + * Validation of the freshest device provides the source of + * validation for the remaining devices. + */ + rs->ti->error = "Unable to assemble array: Invalid superblocks"; + if (super_validate(rs, freshest)) + return -EINVAL; + if (validate_raid_redundancy(rs)) { rs->ti->error = "Insufficient redundancy to activate array"; return -EINVAL; } + rdev_for_each(rdev, mddev) + if (!test_bit(Journal, &rdev->flags) && + rdev != freshest && + super_validate(rs, rdev)) + return -EINVAL; + return 0; +} + +/* + * Adjust data_offset and new_data_offset on all disk members of @rs + * for out of place reshaping if requested by constructor + * + * We need free space at the beginning of each raid disk for forward + * and at the end for backward reshapes which userspace has to provide + * via remapping/reordering of space. + */ +static int rs_adjust_data_offsets(struct raid_set *rs) +{ + sector_t data_offset = 0, new_data_offset = 0; + struct md_rdev *rdev; + + /* Constructor did not request data offset change */ + if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) { + if (!rs_is_reshapable(rs)) + goto out; + + return 0; + } + + /* HM FIXME: get In_Sync raid_dev? */ + rdev = &rs->dev[0].rdev; + + if (rs->delta_disks < 0) { + /* + * Removing disks (reshaping backwards): + * + * - before reshape: data is at offset 0 and free space + * is at end of each component LV + * + * - after reshape: data is at offset rs->data_offset != 0 on each component LV + */ + data_offset = 0; + new_data_offset = rs->data_offset; + + } else if (rs->delta_disks > 0) { + /* + * Adding disks (reshaping forwards): + * + * - before reshape: data is at offset rs->data_offset != 0 and + * free space is at begin of each component LV + * + * - after reshape: data is at offset 0 on each component LV + */ + data_offset = rs->data_offset; + new_data_offset = 0; + + } else { + /* + * User space passes in 0 for data offset after having removed reshape space + * + * - or - (data offset != 0) + * + * Changing RAID layout or chunk size -> toggle offsets + * + * - before reshape: data is at offset rs->data_offset 0 and + * free space is at end of each component LV + * -or- + * data is at offset rs->data_offset != 0 and + * free space is at begin of each component LV + * + * - after reshape: data is at offset 0 if it was at offset != 0 + * or at offset != 0 if it was at offset 0 + * on each component LV + * + */ + data_offset = rs->data_offset ? rdev->data_offset : 0; + new_data_offset = data_offset ? 0 : rs->data_offset; + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + } + /* - * Validation of the freshest device provides the source of - * validation for the remaining devices. + * Make sure we got a minimum amount of free sectors per device */ - ti->error = "Unable to assemble array: Invalid superblocks"; - if (super_validate(mddev, freshest)) - return -EINVAL; + if (rs->data_offset && + bdev_nr_sectors(rdev->bdev) - rs->md.dev_sectors < MIN_FREE_RESHAPE_SPACE) { + rs->ti->error = data_offset ? "No space for forward reshape" : + "No space for backward reshape"; + return -ENOSPC; + } +out: + /* + * Raise resync_offset in case data_offset != 0 to + * avoid false recovery positives in the constructor. + */ + if (rs->md.resync_offset < rs->md.dev_sectors) + rs->md.resync_offset += rs->dev[0].rdev.data_offset; + + /* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */ + rdev_for_each(rdev, &rs->md) { + if (!test_bit(Journal, &rdev->flags)) { + rdev->data_offset = data_offset; + rdev->new_data_offset = new_data_offset; + } + } - rdev_for_each(rdev, mddev) - if ((rdev != freshest) && super_validate(mddev, rdev)) + return 0; +} + +/* Userpace reordered disks -> adjust raid_disk indexes in @rs */ +static void __reorder_raid_disk_indexes(struct raid_set *rs) +{ + int i = 0; + struct md_rdev *rdev; + + rdev_for_each(rdev, &rs->md) { + if (!test_bit(Journal, &rdev->flags)) { + rdev->raid_disk = i++; + rdev->saved_raid_disk = rdev->new_raid_disk = -1; + } + } +} + +/* + * Setup @rs for takeover by a different raid level + */ +static int rs_setup_takeover(struct raid_set *rs) +{ + struct mddev *mddev = &rs->md; + struct md_rdev *rdev; + unsigned int d = mddev->raid_disks = rs->raid_disks; + sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset; + + if (rt_is_raid10(rs->raid_type)) { + if (rs_is_raid0(rs)) { + /* Userpace reordered disks -> adjust raid_disk indexes */ + __reorder_raid_disk_indexes(rs); + + /* raid0 -> raid10_far layout */ + mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR, + rs->raid10_copies); + } else if (rs_is_raid1(rs)) + /* raid1 -> raid10_near layout */ + mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR, + rs->raid_disks); + else return -EINVAL; + } + + clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags); + mddev->resync_offset = MaxSector; + + while (d--) { + rdev = &rs->dev[d].rdev; + + if (test_bit(d, (void *) rs->rebuild_disks)) { + clear_bit(In_sync, &rdev->flags); + clear_bit(Faulty, &rdev->flags); + mddev->resync_offset = rdev->recovery_offset = 0; + /* Bitmap has to be created when we do an "up" takeover */ + set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); + } + + rdev->new_data_offset = new_data_offset; + } + + return 0; +} + +/* Prepare @rs for reshape */ +static int rs_prepare_reshape(struct raid_set *rs) +{ + bool reshape; + struct mddev *mddev = &rs->md; + + if (rs_is_raid10(rs)) { + if (rs->raid_disks != mddev->raid_disks && + __is_raid10_near(mddev->layout) && + rs->raid10_copies && + rs->raid10_copies != __raid10_near_copies(mddev->layout)) { + /* + * raid disk have to be multiple of data copies to allow this conversion, + * + * This is actually not a reshape it is a + * rebuild of any additional mirrors per group + */ + if (rs->raid_disks % rs->raid10_copies) { + rs->ti->error = "Can't reshape raid10 mirror groups"; + return -EINVAL; + } + + /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */ + __reorder_raid_disk_indexes(rs); + mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR, + rs->raid10_copies); + mddev->new_layout = mddev->layout; + reshape = false; + } else + reshape = true; + + } else if (rs_is_raid456(rs)) + reshape = true; + + else if (rs_is_raid1(rs)) { + if (rs->delta_disks) { + /* Process raid1 via delta_disks */ + mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks; + reshape = true; + } else { + /* Process raid1 without delta_disks */ + mddev->raid_disks = rs->raid_disks; + reshape = false; + } + } else { + rs->ti->error = "Called with bogus raid type"; + return -EINVAL; + } + + if (reshape) { + set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags); + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + } else if (mddev->raid_disks < rs->raid_disks) + /* Create new superblocks and bitmaps, if any new disks */ + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + return 0; } /* - * Construct a RAID4/5/6 mapping: + * Reshape: + * - change raid layout + * - change chunk size + * - add disks + * - remove disks + */ +static int rs_setup_reshape(struct raid_set *rs) +{ + int r = 0; + unsigned int cur_raid_devs, d; + sector_t reshape_sectors = _get_reshape_sectors(rs); + struct mddev *mddev = &rs->md; + struct md_rdev *rdev; + + mddev->delta_disks = rs->delta_disks; + cur_raid_devs = mddev->raid_disks; + + /* Ignore impossible layout change whilst adding/removing disks */ + if (mddev->delta_disks && + mddev->layout != mddev->new_layout) { + DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks); + mddev->new_layout = mddev->layout; + } + + /* + * Adjust array size: + * + * - in case of adding disk(s), array size has + * to grow after the disk adding reshape, + * which'll happen in the event handler; + * reshape will happen forward, so space has to + * be available at the beginning of each disk + * + * - in case of removing disk(s), array size + * has to shrink before starting the reshape, + * which'll happen here; + * reshape will happen backward, so space has to + * be available at the end of each disk + * + * - data_offset and new_data_offset are + * adjusted for aforementioned out of place + * reshaping based on userspace passing in + * the "data_offset <sectors>" key/value + * pair via the constructor + */ + + /* Add disk(s) */ + if (rs->delta_disks > 0) { + /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */ + for (d = cur_raid_devs; d < rs->raid_disks; d++) { + rdev = &rs->dev[d].rdev; + clear_bit(In_sync, &rdev->flags); + + /* + * save_raid_disk needs to be -1, or recovery_offset will be set to 0 + * by md, which'll store that erroneously in the superblock on reshape + */ + rdev->saved_raid_disk = -1; + rdev->raid_disk = d; + + rdev->sectors = mddev->dev_sectors; + rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector; + } + + mddev->reshape_backwards = 0; /* adding disk(s) -> forward reshape */ + + /* Remove disk(s) */ + } else if (rs->delta_disks < 0) { + r = rs_set_dev_and_array_sectors(rs, rs->ti->len, true); + mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */ + + /* Change layout and/or chunk size */ + } else { + /* + * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size: + * + * keeping number of disks and do layout change -> + * + * toggle reshape_backward depending on data_offset: + * + * - free space upfront -> reshape forward + * + * - free space at the end -> reshape backward + * + * + * This utilizes free reshape space avoiding the need + * for userspace to move (parts of) LV segments in + * case of layout/chunksize change (for disk + * adding/removing reshape space has to be at + * the proper address (see above with delta_disks): + * + * add disk(s) -> begin + * remove disk(s)-> end + */ + mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1; + } + + /* + * Adjust device size for forward reshape + * because md_finish_reshape() reduces it. + */ + if (!mddev->reshape_backwards) + rdev_for_each(rdev, &rs->md) + if (!test_bit(Journal, &rdev->flags)) + rdev->sectors += reshape_sectors; + + return r; +} + +/* + * If the md resync thread has updated superblock with max reshape position + * at the end of a reshape but not (yet) reset the layout configuration + * changes -> reset the latter. + */ +static void rs_reset_inconclusive_reshape(struct raid_set *rs) +{ + if (!rs_is_reshaping(rs) && rs_is_layout_change(rs, true)) { + rs_set_cur(rs); + rs->md.delta_disks = 0; + rs->md.reshape_backwards = 0; + } +} + +/* + * Enable/disable discard support on RAID set depending on + * RAID level and discard properties of underlying RAID members. + */ +static void configure_discard_support(struct raid_set *rs) +{ + int i; + bool raid456; + struct dm_target *ti = rs->ti; + + /* + * XXX: RAID level 4,5,6 require zeroing for safety. + */ + raid456 = rs_is_raid456(rs); + + for (i = 0; i < rs->raid_disks; i++) { + if (!rs->dev[i].rdev.bdev || + !bdev_max_discard_sectors(rs->dev[i].rdev.bdev)) + return; + + if (raid456) { + if (!devices_handle_discard_safely) { + DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); + DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); + return; + } + } + } + + ti->num_discard_bios = 1; +} + +/* + * Construct a RAID0/1/10/4/5/6 mapping: * Args: - * <raid_type> <#raid_params> <raid_params> \ - * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } + * <raid_type> <#raid_params> <raid_params>{0,} \ + * <#raid_devs> [<meta_dev1> <dev1>]{1,} * - * <raid_params> varies by <raid_type>. See 'parse_raid_params' for + * <raid_params> varies by <raid_type>. See 'parse_raid_params' for * details on possible <raid_params>. + * + * Userspace is free to initialize the metadata devices, hence the superblocks to + * enforce recreation based on the passed in table parameters. + * */ -static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) +static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv) { - int ret; + int r; + bool resize = false; struct raid_type *rt; - unsigned long num_raid_params, num_raid_devs; + unsigned int num_raid_params, num_raid_devs; + sector_t sb_array_sectors, rdev_sectors, reshape_sectors; struct raid_set *rs = NULL; - - /* Must have at least <raid_type> <#raid_params> */ - if (argc < 2) { - ti->error = "Too few arguments"; + const char *arg; + struct rs_layout rs_layout; + struct dm_arg_set as = { argc, argv }, as_nrd; + struct dm_arg _args[] = { + { 0, as.argc, "Cannot understand number of raid parameters" }, + { 1, 254, "Cannot understand number of raid devices parameters" } + }; + + arg = dm_shift_arg(&as); + if (!arg) { + ti->error = "No arguments"; return -EINVAL; } - /* raid type */ - rt = get_raid_type(argv[0]); + rt = get_raid_type(arg); if (!rt) { ti->error = "Unrecognised raid_type"; return -EINVAL; } - argc--; - argv++; - /* number of RAID parameters */ - if (kstrtoul(argv[0], 10, &num_raid_params) < 0) { - ti->error = "Cannot understand number of RAID parameters"; + /* Must have <#raid_params> */ + if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error)) 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"; + /* number of raid device tupples <meta_dev data_dev> */ + as_nrd = as; + dm_consume_args(&as_nrd, num_raid_params); + _args[1].max = (as_nrd.argc - 1) / 2; + if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error)) return -EINVAL; - } - if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || - (num_raid_devs >= INT_MAX)) { - ti->error = "Cannot understand number of raid devices"; + if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) { + ti->error = "Invalid number of supplied raid devices"; return -EINVAL; } - rs = context_alloc(ti, rt, (unsigned)num_raid_devs); + rs = raid_set_alloc(ti, rt, num_raid_devs); if (IS_ERR(rs)) return PTR_ERR(rs); - ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); - if (ret) + r = parse_raid_params(rs, &as, num_raid_params); + if (r) goto bad; - ret = -EINVAL; + r = parse_dev_params(rs, &as); + if (r) + goto bad; - argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ - argv += num_raid_params + 1; + rs->md.sync_super = super_sync; - if (argc != (num_raid_devs * 2)) { - ti->error = "Supplied RAID devices does not match the count given"; + /* + * Calculate ctr requested array and device sizes to allow + * for superblock analysis needing device sizes defined. + * + * Any existing superblock will overwrite the array and device sizes + */ + r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false); + if (r) goto bad; - } - ret = dev_parms(rs, argv); - if (ret) + /* Memorize just calculated, potentially larger sizes to grow the raid set in preresume */ + rs->array_sectors = rs->md.array_sectors; + rs->dev_sectors = rs->md.dev_sectors; + + /* + * Backup any new raid set level, layout, ... + * requested to be able to compare to superblock + * members for conversion decisions. + */ + rs_config_backup(rs, &rs_layout); + + r = analyse_superblocks(ti, rs); + if (r) goto bad; - rs->md.sync_super = super_sync; - ret = analyse_superblocks(ti, rs); - if (ret) + /* All in-core metadata now as of current superblocks after calling analyse_superblocks() */ + sb_array_sectors = rs->md.array_sectors; + rdev_sectors = __rdev_sectors(rs); + if (!rdev_sectors) { + ti->error = "Invalid rdev size"; + r = -EINVAL; goto bad; + } + + + reshape_sectors = _get_reshape_sectors(rs); + if (rs->dev_sectors != rdev_sectors) { + resize = (rs->dev_sectors != rdev_sectors - reshape_sectors); + if (rs->dev_sectors > rdev_sectors - reshape_sectors) + set_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); + } INIT_WORK(&rs->md.event_work, do_table_event); ti->private = rs; ti->num_flush_bios = 1; + ti->needs_bio_set_dev = true; - 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); + /* Restore any requested new layout for conversion decision */ + rs_config_restore(rs, &rs_layout); + + /* + * Now that we have any superblock metadata available, + * check for new, recovering, reshaping, to be taken over, + * to be reshaped or an existing, unchanged raid set to + * run in sequence. + */ + if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) { + /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */ + if (rs_is_raid6(rs) && + test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { + ti->error = "'nosync' not allowed for new raid6 set"; + r = -EINVAL; + goto bad; + } + rs_setup_recovery(rs, 0); + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + rs_set_new(rs); + } else if (rs_is_recovering(rs)) { + /* A recovering raid set may be resized */ + goto size_check; + } else if (rs_is_reshaping(rs)) { + /* Have to reject size change request during reshape */ + if (resize) { + ti->error = "Can't resize a reshaping raid set"; + r = -EPERM; + goto bad; + } + /* skip setup rs */ + } else if (rs_takeover_requested(rs)) { + if (rs_is_reshaping(rs)) { + ti->error = "Can't takeover a reshaping raid set"; + r = -EPERM; + goto bad; + } + + /* We can't takeover a journaled raid4/5/6 */ + if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { + ti->error = "Can't takeover a journaled raid4/5/6 set"; + r = -EPERM; + goto bad; + } + + /* + * If a takeover is needed, userspace sets any additional + * devices to rebuild and we can check for a valid request here. + * + * If acceptable, set the level to the new requested + * one, prohibit requesting recovery, allow the raid + * set to run and store superblocks during resume. + */ + r = rs_check_takeover(rs); + if (r) + goto bad; + + r = rs_setup_takeover(rs); + if (r) + goto bad; + + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + /* Takeover ain't recovery, so disable recovery */ + rs_setup_recovery(rs, MaxSector); + rs_set_new(rs); + } else if (rs_reshape_requested(rs)) { + /* Only request grow on raid set size extensions, not on reshapes. */ + clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); + + /* + * No need to check for 'ongoing' takeover here, because takeover + * is an instant operation as oposed to an ongoing reshape. + */ + + /* We can't reshape a journaled raid4/5/6 */ + if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { + ti->error = "Can't reshape a journaled raid4/5/6 set"; + r = -EPERM; + goto bad; + } + + /* Out-of-place space has to be available to allow for a reshape unless raid1! */ + if (reshape_sectors || rs_is_raid1(rs)) { + /* + * We can only prepare for a reshape here, because the + * raid set needs to run to provide the respective reshape + * check functions via its MD personality instance. + * + * So do the reshape check after md_run() succeeded. + */ + r = rs_prepare_reshape(rs); + if (r) + goto bad; + + /* Reshaping ain't recovery, so disable recovery */ + rs_setup_recovery(rs, MaxSector); + } + rs_set_cur(rs); + } else { +size_check: + /* May not set recovery when a device rebuild is requested */ + if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) { + clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + rs_setup_recovery(rs, MaxSector); + } else if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) { + /* + * Set raid set to current size, i.e. size as of + * superblocks to grow to larger size in preresume. + */ + r = rs_set_dev_and_array_sectors(rs, sb_array_sectors, false); + if (r) + goto bad; + + rs_setup_recovery(rs, rs->md.resync_offset < rs->md.dev_sectors ? rs->md.resync_offset : rs->md.dev_sectors); + } else { + /* This is no size change or it is shrinking, update size and record in superblocks */ + r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false); + if (r) + goto bad; - if (ret) { - ti->error = "Fail to run raid array"; + if (sb_array_sectors > rs->array_sectors) + set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); + } + rs_set_cur(rs); + } + + /* If constructor requested it, change data and new_data offsets */ + r = rs_adjust_data_offsets(rs); + if (r) + goto bad; + + /* Catch any inconclusive reshape superblock content. */ + rs_reset_inconclusive_reshape(rs); + + /* Start raid set read-only and assumed clean to change in raid_resume() */ + rs->md.ro = MD_RDONLY; + rs->md.in_sync = 1; + + /* Has to be held on running the array */ + mddev_suspend_and_lock_nointr(&rs->md); + + /* Keep array frozen until resume. */ + md_frozen_sync_thread(&rs->md); + + r = md_run(&rs->md); + rs->md.in_sync = 0; /* Assume already marked dirty */ + if (r) { + ti->error = "Failed to run raid array"; + mddev_unlock(&rs->md); goto bad; } - if (ti->len != rs->md.array_sectors) { - ti->error = "Array size does not match requested target length"; - ret = -EINVAL; - goto size_mismatch; + r = md_start(&rs->md); + if (r) { + ti->error = "Failed to start raid array"; + goto bad_unlock; } - rs->callbacks.congested_fn = raid_is_congested; - dm_table_add_target_callbacks(ti->table, &rs->callbacks); - mddev_suspend(&rs->md); + /* If raid4/5/6 journal mode explicitly requested (only possible with journal dev) -> set it */ + if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) { + r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode); + if (r) { + ti->error = "Failed to set raid4/5/6 journal mode"; + goto bad_unlock; + } + } + + set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags); + + /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */ + if (rs_is_raid456(rs)) { + r = rs_set_raid456_stripe_cache(rs); + if (r) + goto bad_unlock; + } + + /* Now do an early reshape check */ + if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { + r = rs_check_reshape(rs); + if (r) + goto bad_unlock; + + /* Restore new, ctr requested layout to perform check */ + rs_config_restore(rs, &rs_layout); + + if (rs->md.pers->start_reshape) { + r = rs->md.pers->check_reshape(&rs->md); + if (r) { + ti->error = "Reshape check failed"; + goto bad_unlock; + } + } + } + + /* Disable/enable discard support on raid set. */ + configure_discard_support(rs); + rs->md.dm_gendisk = dm_disk(dm_table_get_md(ti->table)); + + mddev_unlock(&rs->md); return 0; -size_mismatch: +bad_unlock: md_stop(&rs->md); + mddev_unlock(&rs->md); bad: - context_free(rs); + raid_set_free(rs); - return ret; + return r; } static void raid_dtr(struct dm_target *ti) { struct raid_set *rs = ti->private; - list_del_init(&rs->callbacks.list); + mddev_lock_nointr(&rs->md); md_stop(&rs->md); - context_free(rs); + rs->md.dm_gendisk = NULL; + mddev_unlock(&rs->md); + + if (work_pending(&rs->md.event_work)) + flush_work(&rs->md.event_work); + raid_set_free(rs); } static int raid_map(struct dm_target *ti, struct bio *bio) @@ -1274,253 +3341,445 @@ static int raid_map(struct dm_target *ti, struct bio *bio) struct raid_set *rs = ti->private; struct mddev *mddev = &rs->md; - mddev->pers->make_request(mddev, bio); + /* + * If we're reshaping to add disk(s), ti->len and + * mddev->array_sectors will differ during the process + * (ti->len > mddev->array_sectors), so we have to requeue + * bios with addresses > mddev->array_sectors here or + * there will occur accesses past EOD of the component + * data images thus erroring the raid set. + */ + if (unlikely(bio_has_data(bio) && bio_end_sector(bio) > mddev->array_sectors)) + return DM_MAPIO_REQUEUE; + + if (unlikely(!md_handle_request(mddev, bio))) + return DM_MAPIO_REQUEUE; return DM_MAPIO_SUBMITTED; } -static const char *decipher_sync_action(struct mddev *mddev) +/* Return sync state string for @state */ +enum sync_state { st_frozen, st_reshape, st_resync, st_check, st_repair, st_recover, st_idle }; +static const char *sync_str(enum sync_state state) { - 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"; + /* Has to be in above sync_state order! */ + static const char *sync_strs[] = { + "frozen", + "reshape", + "resync", + "check", + "repair", + "recover", + "idle" + }; + + return __within_range(state, 0, ARRAY_SIZE(sync_strs) - 1) ? sync_strs[state] : "undef"; +}; - 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"; +/* Return enum sync_state for @mddev derived from @recovery flags */ +static enum sync_state decipher_sync_action(struct mddev *mddev, unsigned long recovery) +{ + if (test_bit(MD_RECOVERY_FROZEN, &recovery)) + return st_frozen; + + /* The MD sync thread can be done with io or be interrupted but still be running */ + if (!test_bit(MD_RECOVERY_DONE, &recovery) && + (test_bit(MD_RECOVERY_RUNNING, &recovery) || + (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery)))) { + if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) + return st_reshape; + + if (test_bit(MD_RECOVERY_SYNC, &recovery)) { + if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) + return st_resync; + if (test_bit(MD_RECOVERY_CHECK, &recovery)) + return st_check; + return st_repair; } - if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) - return "recover"; + if (test_bit(MD_RECOVERY_RECOVER, &recovery)) + return st_recover; + + if (mddev->reshape_position != MaxSector) + return st_reshape; } - return "idle"; + return st_idle; } -static void raid_status(struct dm_target *ti, status_type_t type, - unsigned status_flags, char *result, unsigned maxlen) +/* + * Return status string for @rdev + * + * Status characters: + * + * 'D' = Dead/Failed raid set component or raid4/5/6 journal device + * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device + * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device + * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr) + */ +static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev) { - 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; + if (!rdev->bdev) + return "-"; + else if (test_bit(Faulty, &rdev->flags)) + return "D"; + else if (test_bit(Journal, &rdev->flags)) + return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a"; + else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags) || + (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) && + !test_bit(In_sync, &rdev->flags))) + return "a"; + else + return "A"; +} - switch (type) { - case STATUSTYPE_INFO: - DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); +/* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */ +static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery, + enum sync_state state, sector_t resync_max_sectors) +{ + sector_t r; + struct mddev *mddev = &rs->md; + + clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); + clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); + + if (rs_is_raid0(rs)) { + r = resync_max_sectors; + set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); - if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) - sync = rs->md.curr_resync_completed; + } else { + if (state == st_idle && !test_bit(MD_RECOVERY_INTR, &recovery)) + r = mddev->resync_offset; else - sync = rs->md.recovery_cp; + r = mddev->curr_resync_completed; - if (sync >= rs->md.resync_max_sectors) { + if (state == st_idle && r >= 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)) { + /* In case we have finished recovering, the array is in sync. */ + if (test_bit(MD_RECOVERY_RECOVER, &recovery)) + set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); + + } else if (state == st_recover) + /* + * In case we are recovering, the array is not in sync + * and health chars should show the recovering legs. + * + * Already retrieved recovery offset from curr_resync_completed above. + */ + ; + + else if (state == st_resync || state == st_reshape) + /* + * If "resync/reshape" is occurring, the raid set + * is or may be out of sync hence the health + * characters shall be 'a'. + */ + set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); + + else if (state == st_check || state == st_repair) /* - * If "check" or "repair" is occurring, the array has - * undergone and initial sync and the health characters + * If "check" or "repair" is occurring, the raid set has + * undergone an initial sync and the health characters * should not be 'a' anymore. */ - array_in_sync = 1; - } else { + set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); + + else if (test_bit(MD_RECOVERY_NEEDED, &recovery)) /* - * 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. + * We are idle and recovery is needed, prevent 'A' chars race + * caused by components still set to in-sync by constructor. */ - for (i = 0; i < rs->md.raid_disks; i++) - if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) - array_in_sync = 1; - } + set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); - /* - * 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"); + else { + /* + * We are idle and the raid set may be doing an initial + * sync, or it may be rebuilding individual components. + * If all the devices are In_sync, then it is the raid set + * that is being initialized. + */ + struct md_rdev *rdev; + + set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); + rdev_for_each(rdev, mddev) + if (!test_bit(Journal, &rdev->flags) && + !test_bit(In_sync, &rdev->flags)) { + clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); + break; + } } + } + + return min(r, resync_max_sectors); +} + +/* Helper to return @dev name or "-" if !@dev */ +static const char *__get_dev_name(struct dm_dev *dev) +{ + return dev ? dev->name : "-"; +} + +static void raid_status(struct dm_target *ti, status_type_t type, + unsigned int status_flags, char *result, unsigned int maxlen) +{ + struct raid_set *rs = ti->private; + struct mddev *mddev = &rs->md; + struct r5conf *conf = rs_is_raid456(rs) ? mddev->private : NULL; + int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0; + unsigned long recovery; + unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */ + unsigned int sz = 0; + unsigned int rebuild_writemostly_count = 0; + sector_t progress, resync_max_sectors, resync_mismatches; + enum sync_state state; + struct raid_type *rt; + + switch (type) { + case STATUSTYPE_INFO: + /* *Should* always succeed */ + rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); + if (!rt) + return; + + DMEMIT("%s %d ", rt->name, mddev->raid_disks); + + /* Access most recent mddev properties for status output */ + smp_rmb(); + /* Get sensible max sectors even if raid set not yet started */ + resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ? + mddev->resync_max_sectors : mddev->dev_sectors; + recovery = rs->md.recovery; + state = decipher_sync_action(mddev, recovery); + progress = rs_get_progress(rs, recovery, state, resync_max_sectors); + resync_mismatches = mddev->last_sync_action == ACTION_CHECK ? + atomic64_read(&mddev->resync_mismatches) : 0; + + /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */ + for (i = 0; i < rs->raid_disks; i++) + DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev)); /* - * In-sync ratio: + * In-sync/Reshape ratio: * The in-sync ratio shows the progress of: - * - Initializing the array - * - Rebuilding a subset of devices of the array + * - Initializing the raid set + * - Rebuilding a subset of devices of the raid set * The user can distinguish between the two by referring * to the status characters. + * + * The reshape ratio shows the progress of + * changing the raid layout or the number of + * disks of a raid set */ - DMEMIT(" %llu/%llu", - (unsigned long long) sync, - (unsigned long long) rs->md.resync_max_sectors); + DMEMIT(" %llu/%llu", (unsigned long long) progress, + (unsigned long long) resync_max_sectors); /* + * v1.5.0+: + * * Sync action: - * See Documentation/device-mapper/dm-raid.c for + * See Documentation/admin-guide/device-mapper/dm-raid.rst for * information on each of these states. */ - DMEMIT(" %s", decipher_sync_action(&rs->md)); + DMEMIT(" %s", sync_str(state)); /* + * v1.5.0+: + * * resync_mismatches/mismatch_cnt * This field shows the number of discrepancies found when - * performing a "check" of the array. + * performing a "check" of the raid set. + */ + DMEMIT(" %llu", (unsigned long long) resync_mismatches); + + /* + * v1.9.0+: + * + * data_offset (needed for out of space reshaping) + * This field shows the data offset into the data + * image LV where the first stripes data starts. + * + * We keep data_offset equal on all raid disks of the set, + * so retrieving it from the first raid disk is sufficient. */ - DMEMIT(" %llu", - (strcmp(rs->md.last_sync_action, "check")) ? 0 : - (unsigned long long) - atomic64_read(&rs->md.resync_mismatches)); + DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset); + + /* + * v1.10.0+: + */ + DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? + __raid_dev_status(rs, &rs->journal_dev.rdev) : "-"); 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); - - 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++) { - if (rs->dev[i].meta_dev) - DMEMIT(" %s", rs->dev[i].meta_dev->name); - else - DMEMIT(" -"); + /* Report the table line string you would use to construct this raid set */ - if (rs->dev[i].data_dev) - DMEMIT(" %s", rs->dev[i].data_dev->name); - else - DMEMIT(" -"); + /* + * Count any rebuild or writemostly argument pairs and subtract the + * hweight count being added below of any rebuild and writemostly ctr flags. + */ + for (i = 0; i < rs->raid_disks; i++) { + rebuild_writemostly_count += (test_bit(i, (void *) rs->rebuild_disks) ? 2 : 0) + + (test_bit(WriteMostly, &rs->dev[i].rdev.flags) ? 2 : 0); } + rebuild_writemostly_count -= (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) ? 2 : 0) + + (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags) ? 2 : 0); + /* Calculate raid parameter count based on ^ rebuild/writemostly argument counts and ctr flags set. */ + raid_param_cnt += rebuild_writemostly_count + + hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) + + hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2; + /* Emit table line */ + /* This has to be in the documented order for userspace! */ + DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors); + if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) + DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC)); + if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) + DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC)); + if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) + for (i = 0; i < rs->raid_disks; i++) + if (test_bit(i, (void *) rs->rebuild_disks)) + DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), i); + if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) + DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP), + mddev->bitmap_info.daemon_sleep); + if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE), + mddev->sync_speed_min); + if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE), + mddev->sync_speed_max); + if (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags)) + for (i = 0; i < rs->raid_disks; i++) + if (test_bit(WriteMostly, &rs->dev[i].rdev.flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY), + rs->dev[i].rdev.raid_disk); + if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) + DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND), + mddev->bitmap_info.max_write_behind); + if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE), + max_nr_stripes); + if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) + DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE), + (unsigned long long) to_sector(mddev->bitmap_info.chunksize)); + if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES), + raid10_md_layout_to_copies(mddev->layout)); + if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) + DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT), + raid10_md_layout_to_format(mddev->layout)); + if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) + DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS), + max(rs->delta_disks, mddev->delta_disks)); + if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) + DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET), + (unsigned long long) rs->data_offset); + if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) + DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV), + __get_dev_name(rs->journal_dev.dev)); + if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) + DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE), + md_journal_mode_to_dm_raid(rs->journal_dev.mode)); + DMEMIT(" %d", rs->raid_disks); + for (i = 0; i < rs->raid_disks; i++) + DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev), + __get_dev_name(rs->dev[i].data_dev)); + break; + + case STATUSTYPE_IMA: + rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); + if (!rt) + return; + + DMEMIT_TARGET_NAME_VERSION(ti->type); + DMEMIT(",raid_type=%s,raid_disks=%d", rt->name, mddev->raid_disks); + + /* Access most recent mddev properties for status output */ + smp_rmb(); + recovery = rs->md.recovery; + state = decipher_sync_action(mddev, recovery); + DMEMIT(",raid_state=%s", sync_str(state)); + + for (i = 0; i < rs->raid_disks; i++) { + DMEMIT(",raid_device_%d_status=", i); + DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev)); + } + + if (rt_is_raid456(rt)) { + DMEMIT(",journal_dev_mode="); + switch (rs->journal_dev.mode) { + case R5C_JOURNAL_MODE_WRITE_THROUGH: + DMEMIT("%s", + _raid456_journal_mode[R5C_JOURNAL_MODE_WRITE_THROUGH].param); + break; + case R5C_JOURNAL_MODE_WRITE_BACK: + DMEMIT("%s", + _raid456_journal_mode[R5C_JOURNAL_MODE_WRITE_BACK].param); + break; + default: + DMEMIT("invalid"); + break; + } + } + DMEMIT(";"); + break; } } -static int raid_message(struct dm_target *ti, unsigned argc, char **argv) +static int raid_message(struct dm_target *ti, unsigned int argc, char **argv, + char *result, unsigned int maxlen) { struct raid_set *rs = ti->private; struct mddev *mddev = &rs->md; - - if (!strcasecmp(argv[0], "reshape")) { - DMERR("Reshape not supported."); - return -EINVAL; - } + int ret = 0; 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 (test_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags) || + test_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags)) + return -EBUSY; - 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)) + if (!strcasecmp(argv[0], "frozen")) { + ret = mddev_lock(mddev); + if (ret) + return ret; + + md_frozen_sync_thread(mddev); + mddev_unlock(mddev); + } else if (!strcasecmp(argv[0], "idle")) { + ret = mddev_lock(mddev); + if (ret) + return ret; + + md_idle_sync_thread(mddev); + mddev_unlock(mddev); + } + + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + if (decipher_sync_action(mddev, mddev->recovery) != st_idle) return -EBUSY; else if (!strcasecmp(argv[0], "resync")) - set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); - else if (!strcasecmp(argv[0], "recover")) { + ; /* MD_RECOVERY_NEEDED set below */ + 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")) + else { + if (!strcasecmp(argv[0], "check")) { set_bit(MD_RECOVERY_CHECK, &mddev->recovery); - else if (!!strcasecmp(argv[0], "repair")) + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + } else if (!strcasecmp(argv[0], "repair")) { + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + } else return -EINVAL; - set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); - set_bit(MD_RECOVERY_SYNC, &mddev->recovery); } - if (mddev->ro == 2) { + if (mddev->ro == MD_AUTO_READ) { /* A write to sync_action is enough to justify * canceling read-auto mode */ - mddev->ro = 0; + mddev->ro = MD_RDWR; if (!mddev->suspended) md_wakeup_thread(mddev->sync_thread); } @@ -1535,56 +3794,100 @@ 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); + unsigned int i; + int r = 0; + + for (i = 0; !r && i < rs->raid_disks; i++) { + if (rs->dev[i].data_dev) { + r = fn(ti, rs->dev[i].data_dev, + 0, /* No offset on data devs */ + rs->md.dev_sectors, data); + } + } - return ret; + return r; } 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; + unsigned int chunk_size_bytes = to_bytes(rs->md.chunk_sectors); - blk_limits_io_min(limits, chunk_size); - blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); + if (chunk_size_bytes) { + limits->io_min = chunk_size_bytes; + limits->io_opt = chunk_size_bytes * mddev_data_stripes(rs); + } } static void raid_presuspend(struct dm_target *ti) { struct raid_set *rs = ti->private; + struct mddev *mddev = &rs->md; + + /* + * From now on, disallow raid_message() to change sync_thread until + * resume, raid_postsuspend() is too late. + */ + set_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); + + if (!reshape_interrupted(mddev)) + return; + + /* + * For raid456, if reshape is interrupted, IO across reshape position + * will never make progress, while caller will wait for IO to be done. + * Inform raid456 to handle those IO to prevent deadlock. + */ + if (mddev->pers && mddev->pers->prepare_suspend) + mddev->pers->prepare_suspend(mddev); +} + +static void raid_presuspend_undo(struct dm_target *ti) +{ + struct raid_set *rs = ti->private; - md_stop_writes(&rs->md); + clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); } static void raid_postsuspend(struct dm_target *ti) { struct raid_set *rs = ti->private; - mddev_suspend(&rs->md); + if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) { + /* + * sync_thread must be stopped during suspend, and writes have + * to be stopped before suspending to avoid deadlocks. + */ + md_stop_writes(&rs->md); + mddev_suspend(&rs->md, false); + rs->md.ro = MD_RDONLY; + } } static void attempt_restore_of_faulty_devices(struct raid_set *rs) { int i; - uint64_t failed_devices, cleared_failed_devices = 0; + uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS]; unsigned long flags; + bool cleared = false; struct dm_raid_superblock *sb; + struct mddev *mddev = &rs->md; struct md_rdev *r; - for (i = 0; i < rs->md.raid_disks; i++) { + /* RAID personalities have to provide hot add/remove methods or we need to bail out. */ + if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk) + return; + + memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices)); + + for (i = 0; i < rs->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)) { + /* HM FIXME: enhance journal device recovery processing */ + if (test_bit(Journal, &r->flags)) + continue; + + if (test_bit(Faulty, &r->flags) && + r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) { DMINFO("Faulty %s device #%d has readable super block." " Attempting to revive it.", rs->raid_type->name, i); @@ -1593,66 +3896,252 @@ static void attempt_restore_of_faulty_devices(struct raid_set *rs) * 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 + * '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(In_sync, &r->flags); /* Mandatory for hot remove. */ + if (r->raid_disk >= 0) { + if (mddev->pers->hot_remove_disk(mddev, r)) { + /* Failed to revive this device, try next */ + r->flags = flags; + continue; + } + } else + r->raid_disk = r->saved_raid_disk = i; + 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; + + if (mddev->pers->hot_add_disk(mddev, r)) { + /* Failed to revive this device, try next */ + r->raid_disk = r->saved_raid_disk = -1; r->flags = flags; } else { + clear_bit(In_sync, &r->flags); r->recovery_offset = 0; - cleared_failed_devices |= 1 << i; + set_bit(i, (void *) cleared_failed_devices); + cleared = true; } } } - if (cleared_failed_devices) { + + /* If any failed devices could be cleared, update all sbs failed_devices bits */ + if (cleared) { + uint64_t failed_devices[DISKS_ARRAY_ELEMS]; + rdev_for_each(r, &rs->md) { + if (test_bit(Journal, &r->flags)) + continue; + 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); + sb_retrieve_failed_devices(sb, failed_devices); + + for (i = 0; i < DISKS_ARRAY_ELEMS; i++) + failed_devices[i] &= ~cleared_failed_devices[i]; + + sb_update_failed_devices(sb, failed_devices); } } } +static int __load_dirty_region_bitmap(struct raid_set *rs) +{ + int r = 0; + + /* Try loading the bitmap unless "raid0", which does not have one */ + if (!rs_is_raid0(rs) && + !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) { + struct mddev *mddev = &rs->md; + + if (md_bitmap_enabled(mddev, false)) { + r = mddev->bitmap_ops->load(mddev); + if (r) + DMERR("Failed to load bitmap"); + } + } + + return r; +} + +/* Enforce updating all superblocks */ +static void rs_update_sbs(struct raid_set *rs) +{ + struct mddev *mddev = &rs->md; + int ro = mddev->ro; + + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + mddev->ro = MD_RDWR; + md_update_sb(mddev, 1); + mddev->ro = ro; +} + +/* + * Reshape changes raid algorithm of @rs to new one within personality + * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes + * disks from a raid set thus growing/shrinking it or resizes the set + * + * Call mddev_lock_nointr() before! + */ +static int rs_start_reshape(struct raid_set *rs) +{ + int r; + struct mddev *mddev = &rs->md; + struct md_personality *pers = mddev->pers; + + /* Don't allow the sync thread to work until the table gets reloaded. */ + set_bit(MD_RECOVERY_WAIT, &mddev->recovery); + + r = rs_setup_reshape(rs); + if (r) + return r; + + /* + * Check any reshape constraints enforced by the personalility + * + * May as well already kick the reshape off so that * pers->start_reshape() becomes optional. + */ + r = pers->check_reshape(mddev); + if (r) { + rs->ti->error = "pers->check_reshape() failed"; + return r; + } + + /* + * Personality may not provide start reshape method in which + * case check_reshape above has already covered everything + */ + if (pers->start_reshape) { + r = pers->start_reshape(mddev); + if (r) { + rs->ti->error = "pers->start_reshape() failed"; + return r; + } + } + + /* + * Now reshape got set up, update superblocks to + * reflect the fact so that a table reload will + * access proper superblock content in the ctr. + */ + rs_update_sbs(rs); + + return 0; +} + +static int raid_preresume(struct dm_target *ti) +{ + int r; + struct raid_set *rs = ti->private; + struct mddev *mddev = &rs->md; + + /* This is a resume after a suspend of the set -> it's already started. */ + if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags)) + return 0; + + /* If different and no explicit grow request, expose MD array size as of superblock. */ + if (!test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) && + rs->array_sectors != mddev->array_sectors) + rs_set_capacity(rs); + + /* + * The superblocks need to be updated on disk if the + * array is new or new devices got added (thus zeroed + * out by userspace) or __load_dirty_region_bitmap + * will overwrite them in core with old data or fail. + */ + if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags)) + rs_update_sbs(rs); + + /* Load the bitmap from disk unless raid0 */ + r = __load_dirty_region_bitmap(rs); + if (r) + return r; + + /* We are extending the raid set size, adjust mddev/md_rdev sizes and set capacity. */ + if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) { + mddev->array_sectors = rs->array_sectors; + mddev->dev_sectors = rs->dev_sectors; + rs_set_rdev_sectors(rs); + rs_set_capacity(rs); + } + + /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) or grown device size */ + if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap && + (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) || + (rs->requested_bitmap_chunk_sectors && + mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) { + int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize; + + if (md_bitmap_enabled(mddev, false)) { + r = mddev->bitmap_ops->resize(mddev, mddev->dev_sectors, + chunksize); + if (r) + DMERR("Failed to resize bitmap"); + } + } + + /* Check for any resize/reshape on @rs and adjust/initiate */ + if (mddev->resync_offset && mddev->resync_offset < MaxSector) { + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + mddev->resync_min = mddev->resync_offset; + if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) + mddev->resync_max_sectors = mddev->dev_sectors; + } + + /* Check for any reshape request unless new raid set */ + if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { + /* Initiate a reshape. */ + rs_set_rdev_sectors(rs); + mddev_lock_nointr(mddev); + r = rs_start_reshape(rs); + mddev_unlock(mddev); + if (r) + DMWARN("Failed to check/start reshape, continuing without change"); + r = 0; + } + + return r; +} + static void raid_resume(struct dm_target *ti) { struct raid_set *rs = ti->private; + struct mddev *mddev = &rs->md; - set_bit(MD_CHANGE_DEVS, &rs->md.flags); - if (!rs->bitmap_loaded) { - bitmap_load(&rs->md); - rs->bitmap_loaded = 1; - } else { + if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) { /* * A secondary resume while the device is active. * Take this opportunity to check whether any failed * devices are reachable again. */ + mddev_lock_nointr(mddev); attempt_restore_of_faulty_devices(rs); + mddev_unlock(mddev); } - clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); - mddev_resume(&rs->md); + if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) { + /* Only reduce raid set size before running a disk removing reshape. */ + if (mddev->delta_disks < 0) + rs_set_capacity(rs); + + mddev_lock_nointr(mddev); + WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)); + WARN_ON_ONCE(rcu_dereference_protected(mddev->sync_thread, + lockdep_is_held(&mddev->reconfig_mutex))); + clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); + mddev->ro = MD_RDWR; + mddev->in_sync = 0; + md_unfrozen_sync_thread(mddev); + mddev_unlock_and_resume(mddev); + } } static struct target_type raid_target = { .name = "raid", - .version = {1, 5, 2}, + .version = {1, 15, 1}, .module = THIS_MODULE, .ctr = raid_ctr, .dtr = raid_dtr, @@ -1662,32 +4151,24 @@ static struct target_type raid_target = { .iterate_devices = raid_iterate_devices, .io_hints = raid_io_hints, .presuspend = raid_presuspend, + .presuspend_undo = raid_presuspend_undo, .postsuspend = raid_postsuspend, + .preresume = raid_preresume, .resume = raid_resume, }; +module_dm(raid); -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); -} - -static void __exit dm_raid_exit(void) -{ - dm_unregister_target(&raid_target); -} - -module_init(dm_raid_init); -module_exit(dm_raid_exit); +module_param(devices_handle_discard_safely, bool, 0644); +MODULE_PARM_DESC(devices_handle_discard_safely, + "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); -MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); +MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target"); +MODULE_ALIAS("dm-raid0"); MODULE_ALIAS("dm-raid1"); MODULE_ALIAS("dm-raid10"); MODULE_ALIAS("dm-raid4"); MODULE_ALIAS("dm-raid5"); MODULE_ALIAS("dm-raid6"); -MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); +MODULE_AUTHOR("Neil Brown <dm-devel@lists.linux.dev>"); +MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@lists.linux.dev>"); MODULE_LICENSE("GPL"); |