| /* |
| * Copyright (C) 2010-2011 Neil Brown |
| * Copyright (C) 2010-2018 Red Hat, Inc. All rights reserved. |
| * |
| * This file is released under the GPL. |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| |
| #include "md.h" |
| #include "raid1.h" |
| #include "raid5.h" |
| #include "raid10.h" |
| #include "md-bitmap.h" |
| |
| #include <linux/device-mapper.h> |
| |
| #define DM_MSG_PREFIX "raid" |
| #define MAX_RAID_DEVICES 253 /* md-raid kernel limit */ |
| |
| /* |
| * 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 = false; |
| |
| /* |
| * The following flags are used by dm-raid.c to set up the array state. |
| * They must be cleared before md_run is called. |
| */ |
| #define FirstUse 10 /* rdev flag */ |
| |
| struct raid_dev { |
| /* |
| * Two DM devices, one to hold metadata and one to hold the |
| * actual data/parity. The reason for this is to not confuse |
| * ti->len and give more flexibility in altering size and |
| * characteristics. |
| * |
| * While it is possible for this device to be associated |
| * with a different physical device than the data_dev, it |
| * is intended for it to be the same. |
| * |--------- Physical Device ---------| |
| * |- meta_dev -|------ data_dev ------| |
| */ |
| struct dm_dev *meta_dev; |
| struct dm_dev *data_dev; |
| struct md_rdev rdev; |
| }; |
| |
| /* |
| * Bits for establishing rs->ctr_flags |
| * |
| * 1 = no flag value |
| * 2 = flag with value |
| */ |
| #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) |
| |
| /* 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 |
| |
| /* 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 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; |
| |
| /* 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[0]; |
| }; |
| |
| 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 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[] = { |
| {"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} |
| }; |
| |
| /* 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.recovery_cp < 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 stands for "offset" |
| * (i.e. adjacent stripes hold copies) |
| * |
| * Refer to MD's raid10.c for details |
| */ |
| if (__is_raid10_offset(layout)) |
| return "offset"; |
| |
| if (__raid10_near_copies(layout) > 1) |
| return "near"; |
| |
| if (__raid10_far_copies(layout) > 1) |
| return "far"; |
| |
| return "unknown"; |
| } |
| |
| /* Return md raid10 algorithm for @name */ |
| static int raid10_name_to_format(const char *name) |
| { |
| 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; |
| } |
| |
| /* Return md raid10 copies for @layout */ |
| static unsigned int raid10_md_layout_to_copies(int layout) |
| { |
| return max(__raid10_near_copies(layout), __raid10_far_copies(layout)); |
| } |
| |
| /* 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 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; |
| |
| } else if (algorithm == ALGORITHM_RAID10_FAR) { |
| f = copies; |
| r = !RAID10_OFFSET; |
| if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) |
| r |= RAID10_USE_FAR_SETS; |
| |
| } else |
| return -EINVAL; |
| |
| return r | (f << RAID10_FAR_COPIES_SHIFT) | n; |
| } |
| /* END: MD raid10 bit definitions and helpers */ |
| |
| /* Check for any of the raid10 algorithms */ |
| static bool __got_raid10(struct raid_type *rtp, const int layout) |
| { |
| 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); |
| |
| while (rtp-- > raid_types) |
| if (!strcasecmp(rtp->name, name)) |
| return rtp; |
| |
| return NULL; |
| } |
| |
| /* 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(gendisk, rs->md.array_sectors); |
| revalidate_disk(gendisk); |
| } |
| |
| /* |
| * 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) |
| { |
| 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) { |
| ti->error = "Insufficient number of devices"; |
| return ERR_PTR(-EINVAL); |
| } |
| |
| 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); |
| |
| 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 = MaxSector; |
| |
| for (i = 0; i < raid_devs; i++) |
| md_rdev_init(&rs->dev[i].rdev); |
| |
| /* |
| * Remaining items to be initialized by further RAID params: |
| * rs->md.persistent |
| * rs->md.external |
| * rs->md.chunk_sectors |
| * rs->md.new_chunk_sectors |
| * rs->md.dev_sectors |
| */ |
| |
| return rs; |
| } |
| |
| /* Free all @rs allocations */ |
| static void raid_set_free(struct raid_set *rs) |
| { |
| int 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); |
| if (rs->dev[i].data_dev) |
| dm_put_device(rs->ti, rs->dev[i].data_dev); |
| } |
| |
| kfree(rs); |
| } |
| |
| /* |
| * For every device we have two words |
| * <meta_dev>: meta device name or '-' if missing |
| * <data_dev>: data device name or '-' if missing |
| * |
| * The following are permitted: |
| * - - |
| * - <data_dev> |
| * <meta_dev> <data_dev> |
| * |
| * The following is not allowed: |
| * <meta_dev> - |
| * |
| * This code parses those words. If there is a failure, |
| * the caller must use raid_set_free() to unwind the operations. |
| */ |
| static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as) |
| { |
| int i; |
| int rebuild = 0; |
| int metadata_available = 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->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 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; |
| |
| 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) { |
| rs->ti->error = "Failed to allocate superblock page"; |
| return -ENOMEM; |
| } |
| } |
| |
| 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; |
| } |
| |
| if (rs->dev[i].meta_dev) { |
| rs->ti->error = "No data device supplied with metadata device"; |
| return -EINVAL; |
| } |
| |
| continue; |
| } |
| |
| 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 r; |
| } |
| |
| if (rs->dev[i].meta_dev) { |
| metadata_available = 1; |
| rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; |
| } |
| rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
| list_add_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) { |
| /* |
| * Without metadata, we will not be able to tell if the array |
| * is in-sync or not - we must assume it is not. Therefore, |
| * it is impossible to rebuild a drive. |
| * |
| * Even if there is metadata, the on-disk information may |
| * indicate that the array is not in-sync and it will then |
| * fail at that time. |
| * |
| * User could specify 'nosync' option if desperate. |
| */ |
| rs->ti->error = "Unable to rebuild drive while array is not in-sync"; |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * validate_region_size |
| * @rs |
| * @region_size: region size in sectors. If 0, pick a size (4MiB default). |
| * |
| * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). |
| * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. |
| * |
| * Returns: 0 on success, -EINVAL on failure. |
| */ |
| static int validate_region_size(struct raid_set *rs, unsigned long region_size) |
| { |
| unsigned long min_region_size = rs->ti->len / (1 << 21); |
| |
| if (rs_is_raid0(rs)) |
| return 0; |
| |
| if (!region_size) { |
| /* |
| * Choose a reasonable default. All figures in sectors. |
| */ |
| if (min_region_size > (1 << 13)) { |
| /* If not a power of 2, make it the next power of 2 */ |
| region_size = roundup_pow_of_two(min_region_size); |
| DMINFO("Choosing default region size of %lu sectors", |
| region_size); |
| } else { |
| DMINFO("Choosing default region size of 4MiB"); |
| region_size = 1 << 13; /* sectors */ |
| } |
| } else { |
| /* |
| * Validate user-supplied value. |
| */ |
| if (region_size > rs->ti->len) { |
| rs->ti->error = "Supplied region size is too large"; |
| return -EINVAL; |
| } |
| |
| if (region_size < min_region_size) { |
| DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", |
| region_size, min_region_size); |
| rs->ti->error = "Supplied region size is too small"; |
| return -EINVAL; |
| } |
| |
| if (!is_power_of_2(region_size)) { |
| rs->ti->error = "Region size is not a power of 2"; |
| return -EINVAL; |
| } |
| |
| if (region_size < rs->md.chunk_sectors) { |
| rs->ti->error = "Region size is smaller than the chunk size"; |
| return -EINVAL; |
| } |
| } |
| |
| /* |
| * Convert sectors to bytes. |
| */ |
| rs->md.bitmap_info.chunksize = to_bytes(region_size); |
| |
| return 0; |
| } |
| |
| /* |
| * validate_raid_redundancy |
| * @rs |
| * |
| * Determine if there are enough devices in the array that haven't |
| * failed (or are being rebuilt) to form a usable array. |
| * |
| * Returns: 0 on success, -EINVAL on failure. |
| */ |
| static int validate_raid_redundancy(struct raid_set *rs) |
| { |
| unsigned int i, rebuild_cnt = 0; |
| unsigned int rebuilds_per_group = 0, copies; |
| unsigned int group_size, last_group_start; |
| |
| for (i = 0; i < rs->md.raid_disks; i++) |
| if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
| !rs->dev[i].rdev.sb_page) |
| rebuild_cnt++; |
| |
| switch (rs->md.level) { |
| case 0: |
| break; |
| case 1: |
| if (rebuild_cnt >= rs->md.raid_disks) |
| goto too_many; |
| break; |
| case 4: |
| case 5: |
| case 6: |
| if (rebuild_cnt > rs->raid_type->parity_devs) |
| goto too_many; |
| break; |
| case 10: |
| copies = raid10_md_layout_to_copies(rs->md.new_layout); |
| if (copies < 2) { |
| DMERR("Bogus raid10 data copies < 2!"); |
| return -EINVAL; |
| } |
| |
| if (rebuild_cnt < copies) |
| break; |
| |
| /* |
| * It is possible to have a higher rebuild count for RAID10, |
| * as long as the failed devices occur in different mirror |
| * groups (i.e. different stripes). |
| * |
| * When checking "near" format, make sure no adjacent devices |
| * have failed beyond what can be handled. In addition to the |
| * simple case where the number of devices is a multiple of the |
| * number of copies, we must also handle cases where the number |
| * of devices is not a multiple of the number of copies. |
| * E.g. dev1 dev2 dev3 dev4 dev5 |
| * A A B B C |
| * C D D E E |
| */ |
| if (__is_raid10_near(rs->md.new_layout)) { |
| for (i = 0; i < rs->md.raid_disks; i++) { |
| if (!(i % copies)) |
| rebuilds_per_group = 0; |
| if ((!rs->dev[i].rdev.sb_page || |
| !test_bit(In_sync, &rs->dev[i].rdev.flags)) && |
| (++rebuilds_per_group >= copies)) |
| goto too_many; |
| } |
| break; |
| } |
| |
| /* |
| * When checking "far" and "offset" formats, we need to ensure |
| * that the device that holds its copy is not also dead or |
| * being rebuilt. (Note that "far" and "offset" formats only |
| * support two copies right now. These formats also only ever |
| * use the 'use_far_sets' variant.) |
| * |
| * This check is somewhat complicated by the need to account |
| * for arrays that are not a multiple of (far) copies. This |
| * results in the need to treat the last (potentially larger) |
| * set differently. |
| */ |
| group_size = (rs->md.raid_disks / copies); |
| last_group_start = (rs->md.raid_disks / group_size) - 1; |
| last_group_start *= group_size; |
| for (i = 0; i < rs->md.raid_disks; i++) { |
| if (!(i % copies) && !(i > last_group_start)) |
| rebuilds_per_group = 0; |
| if ((!rs->dev[i].rdev.sb_page || |
| !test_bit(In_sync, &rs->dev[i].rdev.flags)) && |
| (++rebuilds_per_group >= copies)) |
| goto too_many; |
| } |
| break; |
| default: |
| if (rebuild_cnt) |
| return -EINVAL; |
| } |
| |
| return 0; |
| |
| too_many: |
| return -EINVAL; |
| } |
| |
| /* |
| * Possible arguments are... |
| * <chunk_size> [optional_args] |
| * |
| * Argument definitions |
| * <chunk_size> The number of sectors per disk that |
| * will form the "stripe" |
| * [[no]sync] Force or prevent recovery of the |
| * entire array |
| * [rebuild <idx>] Rebuild the drive indicated by the index |
| * [daemon_sleep <ms>] Time between bitmap daemon work to |
| * clear bits |
| * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| * [write_mostly <idx>] Indicate a write mostly drive via index |
| * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
| * [stripe_cache <sectors>] Stripe cache size for higher RAIDs |
| * [region_size <sectors>] Defines granularity of bitmap |
| * [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_format <near|far|offset>] Layout algorithm. (Default: near) |
| */ |
| 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; |
| 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 (rt_is_raid1(rt)) { |
| if (value) |
| DMERR("Ignoring chunk size parameter for RAID 1"); |
| value = 0; |
| } else if (!is_power_of_2(value)) { |
| rs->ti->error = "Chunk size must be a power of 2"; |
| return -EINVAL; |
| } else if (value < 8) { |
| rs->ti->error = "Chunk size value is too small"; |
| return -EINVAL; |
| } |
| |
| rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; |
| |
| /* |
| * We set each individual device as In_sync with a completed |
| * 'recovery_offset'. If there has been a device failure or |
| * replacement then one of the following cases applies: |
| * |
| * 1) User specifies 'rebuild'. |
| * - Device is reset when param is read. |
| * 2) A new device is supplied. |
| * - No matching superblock found, resets device. |
| * 3) Device failure was transient and returns on reload. |
| * - Failure noticed, resets device for bitmap replay. |
| * 4) Device hadn't completed recovery after previous failure. |
| * - Superblock is read and overrides recovery_offset. |
| * |
| * What is found in the superblocks of the devices is always |
| * authoritative, unless 'rebuild' or '[no]sync' was specified. |
| */ |
| for (i = 0; i < rs->raid_disks; i++) { |
| set_bit(In_sync, &rs->dev[i].rdev.flags); |
| rs->dev[i].rdev.recovery_offset = MaxSector; |
| } |
| |
| /* |
| * Second, parse the unordered optional arguments |
| */ |
| for (i = 0; i < num_raid_params; i++) { |
| 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(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; |
| } |
| |
| arg = dm_shift_arg(as); |
| i++; /* Account for the argument pairs */ |
| if (!arg) { |
| rs->ti->error = "Wrong number of raid parameters given"; |
| return -EINVAL; |
| } |
| |
| /* |
| * 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; |
| } |
| 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; |
| } |
| 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 = to_sector(i_size_read(jdev->bdev->bd_inode)); |
| 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; |
| } |
| |
| /* "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; |
| } |
| |
| 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; |
| } |
| |
| 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 (!__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); |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * In device-mapper, we specify things in sectors, but |
| * MD records this value in kB |
| */ |
| if (value < 0 || value / 2 > COUNTER_MAX) { |
| rs->ti->error = "Max write-behind limit out of range"; |
| return -EINVAL; |
| } |
| |
| 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, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) { |
| /* Userspace passes new data_offset after having extended the 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; |
| } |
| |
| 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 (!rt_is_raid456(rt)) { |
| rs->ti->error = "Inappropriate argument: stripe_cache"; |
| return -EINVAL; |
| } |
| |
| 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; |
| } |
| |
| if (value < 0) { |
| rs->ti->error = "min_recovery_rate out of range"; |
| return -EINVAL; |
| } |
| 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 = 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; |
| 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; |
| } |
| |
| raid10_copies = value; |
| } else { |
| DMERR("Unable to parse RAID parameter: %s", key); |
| 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; |
| |
| if (rs->md.chunk_sectors) |
| max_io_len = rs->md.chunk_sectors; |
| else |
| max_io_len = region_size; |
| |
| if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
| return -EINVAL; |
| |
| if (rt_is_raid10(rt)) { |
| if (raid10_copies > rs->md.raid_disks) { |
| rs->ti->error = "Not enough devices to satisfy specification"; |
| 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; |
| } |
| |
| rt = get_raid_type_by_ll(10, rs->md.new_layout); |
| if (!rt) { |
| rs->ti->error = "Failed to recognize new raid10 layout"; |
| 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->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->md.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, to_sector(i_size_read(rdev->bdev->bd_inode))); |
| if (ds < rs->md.dev_sectors) { |
| rs->ti->error = "Component device(s) too small"; |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Calculate the sectors per device and per array used for @rs */ |
| static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev) |
| { |
| int delta_disks; |
| unsigned int data_stripes; |
| struct mddev *mddev = &rs->md; |
| struct md_rdev *rdev; |
| sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len; |
| |
| 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; |
| 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; |
| |
| rdev_for_each(rdev, mddev) |
| if (!test_bit(Journal, &rdev->flags)) |
| rdev->sectors = dev_sectors; |
| |
| mddev->array_sectors = array_sectors; |
| mddev->dev_sectors = dev_sectors; |
| |
| 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.recovery_cp = 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.recovery_cp = dev_sectors; |
| /* |
| * Other raid set types may skip recovery |
| * depending on the 'nosync' flag. |
| */ |
| else |
| rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags) |
| ? MaxSector : dev_sectors; |
| } |
| |
| /* Setup recovery on @rs based on raid type, device size and 'nosync' flag */ |
| static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors) |
| { |
| if (!dev_sectors) |
| /* New raid set or 'sync' flag provided */ |
| __rs_setup_recovery(rs, 0); |
| else if (dev_sectors == MaxSector) |
| /* Prevent recovery */ |
| __rs_setup_recovery(rs, MaxSector); |
| else if (__rdev_sectors(rs) < dev_sectors) |
| /* Grown raid set */ |
| __rs_setup_recovery(rs, __rdev_sectors(rs)); |
| else |
| __rs_setup_recovery(rs, MaxSector); |
| } |
| |
| 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 */ |
| if (!rs_is_reshaping(rs)) { |
| if (rs_is_raid10(rs)) |
| rs_set_rdev_sectors(rs); |
| rs_set_capacity(rs); |
| } |
| dm_table_event(rs->ti->table); |
| } |
| |
| static int raid_is_congested(struct dm_target_callbacks *cb, int bits) |
| { |
| struct raid_set *rs = container_of(cb, struct raid_set, callbacks); |
| |
| return mddev_congested(&rs->md, 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 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; |
| |
| near_copies = __raid10_near_copies(mddev->layout); |
| |
| /* 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; |
| } |
| |
| /* 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; |
| |
| 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 @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 = mddev->new_layout != mddev->layout || |
| mddev->new_chunk_sectors != mddev->chunk_sectors || |
| rs->delta_disks; |
| |
| /* 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. |
| */ |
| #define DM_RAID_MAGIC 0x64526D44 |
| struct dm_raid_superblock { |
| __le32 magic; /* "DmRd" */ |
| __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */ |
| |
| __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; /* 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 |
| * an individual drive. |
| */ |
| __le64 disk_recovery_offset; |
| |
| /* |
| * This offset tracks the progress of the initial raid set |
| * synchronisation/parity calculation. |
| */ |
| __le64 array_resync_offset; |
| |
| /* |
| * raid characteristics |
| */ |
| __le32 level; |
| __le32 layout; |
| __le32 stripe_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 |
| */ |
| |
| __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 */ |
| |
| /* |
| * Additonal 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; |
| |
| /* |
| * 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 && !force_reload) |
| return 0; |
| |
| rdev->sb_loaded = 0; |
| |
| if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) { |
| DMERR("Failed to read superblock of device at position %d", |
| rdev->raid_disk); |
| md_error(rdev->mddev, rdev); |
| set_bit(Faulty, &rdev->flags); |
| return -EIO; |
| } |
| |
| rdev->sb_loaded = 1; |
| |
| 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) |
| { |
| 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); |
| |
| sb_retrieve_failed_devices(sb, failed_devices); |
| |
| 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->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->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); |
| sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); |
| |
| sb->level = cpu_to_le32(mddev->level); |
| sb->layout = cpu_to_le32(mddev->layout); |
| sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); |
| |
| /******************************************************************** |
| * 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)); |
| } |
| |
| /* |
| * super_load |
| * |
| * This function creates a superblock if one is not found on the device |
| * and will decide which superblock to use if there's a choice. |
| * |
| * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise |
| */ |
| static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
| { |
| int r; |
| struct dm_raid_superblock *sb; |
| struct dm_raid_superblock *refsb; |
| uint64_t events_sb, events_refsb; |
| |
| r = read_disk_sb(rdev, rdev->sb_size, false); |
| if (r) |
| return r; |
| |
| sb = page_address(rdev->sb_page); |
| |
| /* |
| * Two cases that we want to write new superblocks and rebuild: |
| * 1) New device (no matching magic number) |
| * 2) Device specified for rebuild (!In_sync w/ offset == 0) |
| */ |
| if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || |
| (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { |
| super_sync(rdev->mddev, rdev); |
| |
| set_bit(FirstUse, &rdev->flags); |
| sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); |
| |
| /* Force writing of superblocks to disk */ |
| set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags); |
| |
| /* Any superblock is better than none, choose that if given */ |
| return refdev ? 0 : 1; |
| } |
| |
| if (!refdev) |
| return 1; |
| |
| events_sb = le64_to_cpu(sb->events); |
| |
| refsb = page_address(refdev->sb_page); |
| events_refsb = le64_to_cpu(refsb->events); |
| |
| return (events_sb > events_refsb) ? 1 : 0; |
| } |
| |
| static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev) |
| { |
| int role; |
| unsigned int d; |
| struct mddev *mddev = &rs->md; |
| uint64_t events_sb; |
| uint64_t failed_devices[DISKS_ARRAY_ELEMS]; |
| struct dm_raid_superblock *sb; |
| 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); |
| |
| /* |
| * 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 supported, e.g. reshape_position is valid |
| * in superblock and superblock content is authoritative. |
| */ |
| 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; |
| } |
| |
| 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 (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) |
| mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
| |
| /* |
| * During load, we set FirstUse if a new superblock was written. |
| * There are two reasons we might not have a superblock: |
| * 1) The raid set 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 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. |
| * 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. |
| */ |
| d = 0; |
| 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); |
| rebuilds++; |
| |
| if (test_bit(FirstUse, &r->flags)) |
| rebuild_and_new++; |
| } |
| |
| d++; |
| } |
| |
| if (new_devs == rs->raid_disks || !rebuilds) { |
| /* Replace a broken device */ |
| if (new_devs == 1 && !rs->delta_disks) |
| ; |
| 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 != 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 && 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 (recovery_cp=%llu)", |
| (unsigned long long) mddev->recovery_cp); |
| 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 (test_bit(Journal, &rdev->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_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("raid device #%d now at position #%d", role, r->raid_disk); |
| } |
| |
| /* |
| * Partial recovery is performed on |
| * returning failed devices. |
| */ |
| if (test_bit(role, (void *) failed_devices)) |
| set_bit(Faulty, &r->flags); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int super_validate(struct raid_set *rs, struct md_rdev *rdev) |
| { |
| 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(rs, rdev)) |
| return -EINVAL; |
| |
| 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 for RAID levels != 0 */ |
| 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) |
| 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_and_clear_bit(Faulty, &rdev->flags)) { |
| rdev->recovery_offset = 0; |
| clear_bit(In_sync, &rdev->flags); |
| rdev->saved_raid_disk = rdev->raid_disk; |
| } |
| |
| /* Reshape support -> restore repective data offsets */ |
| rdev->data_offset = le64_to_cpu(sb->data_offset); |
| rdev->new_data_offset = le64_to_cpu(sb->new_data_offset); |
| |
| return 0; |
| } |
| |
| /* |
| * Analyse superblocks and select the freshest. |
| */ |
| static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) |
| { |
| int r; |
| struct md_rdev *rdev, *freshest; |
| struct mddev *mddev = &rs->md; |
| |
| freshest = NULL; |
| 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 CTR_FLAG_SYNC will cause |
| * the array to undergo initialization again as |
| * though it were new. This is the intended effect |
| * of the "sync" directive. |
| * |
| * With reshaping capability added, we must ensure that |
| * that the "sync" directive is disallowed during the reshape. |
| */ |
| if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) |
| continue; |
| |
| r = super_load(rdev, freshest); |
| |
| switch (r) { |
| case 1: |
| freshest = rdev; |
| break; |
| case 0: |
| break; |
| default: |
| /* This is a failure to read the superblock from the metadata device. */ |
| /* |
| * We have to keep any raid0 data/metadata device pairs or |
| * the MD raid0 personality will fail to start the array. |
| */ |
| if (rs_is_raid0(rs)) |
| continue; |
| |
| /* |
| * 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 contructor |
| * |
| * 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); |
| } |
| |
| /* |
| * Make sure we got a minimum amount of free sectors per device |
| */ |
| if (rs->data_offset && |
| to_sector(i_size_read(rdev->bdev->bd_inode)) - 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 recovery_cp in case data_offset != 0 to |
| * avoid false recovery positives in the constructor. |
| */ |
| if (rs->md.recovery_cp < rs->md.dev_sectors) |
| rs->md.recovery_cp += 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; |
| } |
| } |
| |
| 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->recovery_cp = 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->recovery_cp = 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; |
| } |
| |
| /* 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); |
| } |
| |
| /* |
| * |
| * - 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 hapen 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, 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; |
| } |
| |
| /* |
| * 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++) { |
| struct request_queue *q; |
| |
| if (!rs->dev[i].rdev.bdev) |
| continue; |
| |
| q = bdev_get_queue(rs->dev[i].rdev.bdev); |
| if (!q || !blk_queue_discard(q)) |
| 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>{0,} \ |
| * <#raid_devs> [<meta_dev1> <dev1>]{1,} |
| * |
| * <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 int argc, char **argv) |
| { |
| int r; |
| bool resize = false; |
| struct raid_type *rt; |
| unsigned int num_raid_params, num_raid_devs; |
| sector_t calculated_dev_sectors, rdev_sectors, reshape_sectors; |
| struct raid_set *rs = NULL; |
| 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" } |
| }; |
| |
| /* Must have <raid_type> */ |
| arg = dm_shift_arg(&as); |
| if (!arg) { |
| ti->error = "No arguments"; |
| return -EINVAL; |
| } |
| |
| rt = get_raid_type(arg); |
| if (!rt) { |
| ti->error = "Unrecognised raid_type"; |
| return -EINVAL; |
| } |
| |
| /* Must have <#raid_params> */ |
| if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error)) |
| return -EINVAL; |
| |
| /* 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 |