/* * 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 | \ <------><------><------><------> CTR_FLAG_JOURNAL_DEV | \ <------><------><------><------> CTR_FLAG_JOURNAL_MODE) /* Valid options definitions per raid level... */ /* "raid0" does only accept data offset */ #define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET) /* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */ #define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ <------><------><------><------> CTR_FLAG_REBUILD | \ <------><------><------><------> CTR_FLAG_WRITE_MOSTLY | \ <------><------><------><------> CTR_FLAG_DAEMON_SLEEP | \ <------><------><------><------> CTR_FLAG_MIN_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_MAX_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_MAX_WRITE_BEHIND | \ <------><------><------><------> CTR_FLAG_REGION_SIZE | \ <------><------><------><------> CTR_FLAG_DELTA_DISKS | \ <------><------><------><------> CTR_FLAG_DATA_OFFSET) /* "raid10" does not accept any raid1 or stripe cache options */ #define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ <------><------><------><------> CTR_FLAG_REBUILD | \ <------><------><------><------> CTR_FLAG_DAEMON_SLEEP | \ <------><------><------><------> CTR_FLAG_MIN_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_MAX_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_REGION_SIZE | \ <------><------><------><------> CTR_FLAG_RAID10_COPIES | \ <------><------><------><------> CTR_FLAG_RAID10_FORMAT | \ <------><------><------><------> CTR_FLAG_DELTA_DISKS | \ <------><------><------><------> CTR_FLAG_DATA_OFFSET | \ <------><------><------><------> CTR_FLAG_RAID10_USE_NEAR_SETS) /* * "raid4/5/6" do not accept any raid1 or raid10 specific options * * "raid6" does not accept "nosync", because it is not guaranteed * that both parity and q-syndrome are being written properly with * any writes */ #define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ <------><------><------><------> CTR_FLAG_REBUILD | \ <------><------><------><------> CTR_FLAG_DAEMON_SLEEP | \ <------><------><------><------> CTR_FLAG_MIN_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_MAX_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_STRIPE_CACHE | \ <------><------><------><------> CTR_FLAG_REGION_SIZE | \ <------><------><------><------> CTR_FLAG_DELTA_DISKS | \ <------><------><------><------> CTR_FLAG_DATA_OFFSET | \ <------><------><------><------> CTR_FLAG_JOURNAL_DEV | \ <------><------><------><------> CTR_FLAG_JOURNAL_MODE) #define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \ <------><------><------><------> CTR_FLAG_REBUILD | \ <------><------><------><------> CTR_FLAG_DAEMON_SLEEP | \ <------><------><------><------> CTR_FLAG_MIN_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_MAX_RECOVERY_RATE | \ <------><------><------><------> CTR_FLAG_STRIPE_CACHE | \ <------><------><------><------> CTR_FLAG_REGION_SIZE | \ <------><------><------><------> CTR_FLAG_DELTA_DISKS | \ <------><------><------><------> CTR_FLAG_DATA_OFFSET | \ <------><------><------><------> CTR_FLAG_JOURNAL_DEV | \ <------><------><------><------> CTR_FLAG_JOURNAL_MODE) /* ...valid options definitions per raid level */ /* * Flags for rs->runtime_flags field * (RT_FLAG prefix meaning "runtime flag") * * These are all internal and used to define runtime state, * e.g. to prevent another resume from preresume processing * the raid set all over again. */ #define RT_FLAG_RS_PRERESUMED 0 #define RT_FLAG_RS_RESUMED 1 #define RT_FLAG_RS_BITMAP_LOADED 2 #define RT_FLAG_UPDATE_SBS 3 #define RT_FLAG_RESHAPE_RS 4 #define RT_FLAG_RS_SUSPENDED 5 #define RT_FLAG_RS_IN_SYNC 6 #define RT_FLAG_RS_RESYNCING 7 #define RT_FLAG_RS_GROW 8 /* 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; <------>sector_t array_sectors; <------>sector_t dev_sectors; <------>/* Optional raid4/5/6 journal device */ <------>struct journal_dev { <------><------>struct dm_dev *dev; <------><------>struct md_rdev rdev; <------><------>int mode; <------>} journal_dev; <------>struct raid_dev dev[]; }; 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; <------><------>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_size(gendisk, true); } /* * 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, sector_t sectors, bool use_mddev) { <------>int delta_disks; <------>unsigned int data_stripes; <------>sector_t array_sectors = sectors, dev_sectors = sectors; <------>struct mddev *mddev = &rs->md; <------>if (use_mddev) { <------><------>delta_disks = mddev->delta_disks; <------><------>data_stripes = mddev_data_stripes(rs); <------>} else { <------><------>delta_disks = rs->delta_disks; <------><------>data_stripes = rs_data_stripes(rs); <------>} <------>/* Special raid1 case w/o delta_disks support (yet) */ <------>if (rt_is_raid1(rs->raid_type)) <------><------>; <------>else if (rt_is_raid10(rs->raid_type)) { <------><------>if (rs->raid10_copies < 2 || <------><------> delta_disks < 0) { <------><------><------>rs->ti->error = "Bogus raid10 data copies or delta disks"; <------><------><------>return -EINVAL; <------><------>} <------><------>dev_sectors *= rs->raid10_copies; <------><------>if (sector_div(dev_sectors, data_stripes)) <------><------><------>goto bad; <------><------>array_sectors = (data_stripes + delta_disks) * dev_sectors; <------><------>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; <------>mddev->array_sectors = array_sectors; <------>mddev->dev_sectors = dev_sectors; <------>rs_set_rdev_sectors(rs); <------>return _check_data_dev_sectors(rs); bad: <------>rs->ti->error = "Target length not divisible by number of data devices"; <------>return -EINVAL; } /* Setup recovery on @rs */ static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors) { <------>/* raid0 does not recover */ <------>if (rs_is_raid0(rs)) <------><------>rs->md.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; } 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); } /* * 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 layout is set to reshape. */ static bool rs_is_layout_change(struct raid_set *rs, bool use_mddev) { <------>return (use_mddev ? rs->md.delta_disks : rs->delta_disks) || <------> rs->md.new_layout != rs->md.layout || <------> rs->md.new_chunk_sectors != rs->md.chunk_sectors; } /* True if @rs is requested to reshape by ctr */ static bool rs_reshape_requested(struct raid_set *rs) { <------>bool change; <------>struct mddev *mddev = &rs->md; <------>if (rs_takeover_requested(rs)) <------><------>return false; <------>if (rs_is_raid0(rs)) <------><------>return false; <------>change = rs_is_layout_change(rs, false); <------>/* Historical case to support raid1 reshape without delta disks */ <------>if (rs_is_raid1(rs)) { <------><------>if (rs->delta_disks) <------><------><------>return !!rs->delta_disks; <------><------>return !change && <------><------> mddev->raid_disks != rs->raid_disks; <------>} <------>if (rs_is_raid10(rs)) <------><------>return change && <------><------> !__is_raid10_far(mddev->new_layout) && <------><------> rs->delta_disks >= 0; <------>return change; } /* Features */ #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */ /* State flags for sb->flags */ #define SB_FLAG_RESHAPE_ACTIVE 0x1 #define SB_FLAG_RESHAPE_BACKWARDS 0x2 /* * This structure is never routinely used by userspace, unlike md superblocks. * Devices with this superblock should only ever be accessed via device-mapper. */ #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 == 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 on @rs unless no metadevs or raid0 or journaled raid4/5/6 set. */ <------>mddev->bitmap_info.offset = (rt_is_raid0(rs->raid_type) || rs->journal_dev.dev) ? 0 : to_sector(4096); <------>mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; <------>if (!test_and_clear_bit(FirstUse, &rdev->flags)) { <------><------>/* <------><------> * Retrieve rdev size stored in superblock to be prepared for shrink. <------><------> * Check extended superblock members are present otherwise the size <------><------> * will not be set! <------><------> */ <------><------>if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) <------><------><------>rdev->sectors = le64_to_cpu(sb->sectors); <------><------>rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); <------><------>if (rdev->recovery_offset == MaxSector) <------><------><------>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); } /* * Reshape: * - change raid layout * - change chunk size * - add disks * - remove disks */ static int rs_setup_reshape(struct raid_set *rs) { <------>int r = 0; <------>unsigned int cur_raid_devs, d; <------>sector_t reshape_sectors = _get_reshape_sectors(rs); <------>struct mddev *mddev = &rs->md; <------>struct md_rdev *rdev; <------>mddev->delta_disks = rs->delta_disks; <------>cur_raid_devs = mddev->raid_disks; <------>/* Ignore impossible layout change whilst adding/removing disks */ <------>if (mddev->delta_disks && <------> mddev->layout != mddev->new_layout) { <------><------>DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks); <------><------>mddev->new_layout = mddev->layout; <------>} <------>/* <------> * Adjust array size: <------> * <------> * - in case of adding disk(s), array size has <------> * to grow after the disk adding reshape, <------> * which'll 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, rs->ti->len, true); <------><------>mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */ <------>/* Change layout and/or chunk size */ <------>} else { <------><------>/* <------><------> * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size: <------><------> * <------><------> * keeping number of disks and do layout change -> <------><------> * <------><------> * toggle reshape_backward depending on data_offset: <------><------> * <------><------> * - free space upfront -> reshape forward <------><------> * <------><------> * - free space at the end -> reshape backward <------><------> * <------><------> * <------><------> * This utilizes free reshape space avoiding the need <------><------> * for userspace to move (parts of) LV segments in <------><------> * case of layout/chunksize change (for disk <------><------> * adding/removing reshape space has to be at <------><------> * the proper address (see above with delta_disks): <------><------> * <------><------> * add disk(s) -> begin <------><------> * remove disk(s)-> end <------><------> */ <------><------>mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1; <------>} <------>/* <------> * Adjust device size for forward reshape <------> * because md_finish_reshape() reduces it. <------> */ <------>if (!mddev->reshape_backwards) <------><------>rdev_for_each(rdev, &rs->md) <------><------><------>if (!test_bit(Journal, &rdev->flags)) <------><------><------><------>rdev->sectors += reshape_sectors; <------>return r; } /* * If the md resync thread has updated superblock with max reshape position * at the end of a reshape but not (yet) reset the layout configuration * changes -> reset the latter. */ static void rs_reset_inconclusive_reshape(struct raid_set *rs) { <------>if (!rs_is_reshaping(rs) && rs_is_layout_change(rs, true)) { <------><------>rs_set_cur(rs); <------><------>rs->md.delta_disks = 0; <------><------>rs->md.reshape_backwards = 0; <------>} } /* * Enable/disable discard support on RAID set depending on * RAID level and discard properties of underlying RAID members. */ static void configure_discard_support(struct raid_set *rs) { <------>int i; <------>bool raid456; <------>struct dm_target *ti = rs->ti; <------>/* <------> * XXX: RAID level 4,5,6 require zeroing for safety. <------> */ <------>raid456 = rs_is_raid456(rs); <------>for (i = 0; i < rs->raid_disks; i++) { <------><------>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 sb_array_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" } <------>}; <------>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 + 1, &as_nrd, &num_raid_devs, &ti->error)) <------><------>return -EINVAL; <------>if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) { <------><------>ti->error = "Invalid number of supplied raid devices"; <------><------>return -EINVAL; <------>} <------>rs = raid_set_alloc(ti, rt, num_raid_devs); <------>if (IS_ERR(rs)) <------><------>return PTR_ERR(rs); <------>r = parse_raid_params(rs, &as, num_raid_params); <------>if (r) <------><------>goto bad; <------>r = parse_dev_params(rs, &as); <------>if (r) <------><------>goto bad; <------>rs->md.sync_super = super_sync; <------>/* <------> * Calculate ctr requested array and device sizes to allow <------> * for superblock analysis needing device sizes defined. <------> * <------> * Any existing superblock will overwrite the array and device sizes <------> */ <------>r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false); <------>if (r) <------><------>goto bad; <------>/* Memorize just calculated, potentially larger sizes to grow the raid set in preresume */ <------>rs->array_sectors = rs->md.array_sectors; <------>rs->dev_sectors = rs->md.dev_sectors; <------>/* <------> * Backup any new raid set level, layout, ... <------> * requested to be able to compare to superblock <------> * members for conversion decisions. <------> */ <------>rs_config_backup(rs, &rs_layout); <------>r = analyse_superblocks(ti, rs); <------>if (r) <------><------>goto bad; <------>/* All in-core metadata now as of current superblocks after calling analyse_superblocks() */ <------>sb_array_sectors = rs->md.array_sectors; <------>rdev_sectors = __rdev_sectors(rs); <------>if (!rdev_sectors) { <------><------>ti->error = "Invalid rdev size"; <------><------>r = -EINVAL; <------><------>goto bad; <------>} <------>reshape_sectors = _get_reshape_sectors(rs); <------>if (rs->dev_sectors != rdev_sectors) { <------><------>resize = (rs->dev_sectors != rdev_sectors - reshape_sectors); <------><------>if (rs->dev_sectors > rdev_sectors - reshape_sectors) <------><------><------>set_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); <------>} <------>INIT_WORK(&rs->md.event_work, do_table_event); <------>ti->private = rs; <------>ti->num_flush_bios = 1; <------>/* Restore any requested new layout for conversion decision */ <------>rs_config_restore(rs, &rs_layout); <------>/* <------> * Now that we have any superblock metadata available, <------> * check for new, recovering, reshaping, to be taken over, <------> * to be reshaped or an existing, unchanged raid set to <------> * run in sequence. <------> */ <------>if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) { <------><------>/* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */ <------><------>if (rs_is_raid6(rs) && <------><------> test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { <------><------><------>ti->error = "'nosync' not allowed for new raid6 set"; <------><------><------>r = -EINVAL; <------><------><------>goto bad; <------><------>} <------><------>rs_setup_recovery(rs, 0); <------><------>set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); <------><------>rs_set_new(rs); <------>} else if (rs_is_recovering(rs)) { <------><------>/* A recovering raid set may be resized */ <------><------>goto size_check; <------>} else if (rs_is_reshaping(rs)) { <------><------>/* Have to reject size change request during reshape */ <------><------>if (resize) { <------><------><------>ti->error = "Can't resize a reshaping raid set"; <------><------><------>r = -EPERM; <------><------><------>goto bad; <------><------>} <------><------>/* skip setup rs */ <------>} else if (rs_takeover_requested(rs)) { <------><------>if (rs_is_reshaping(rs)) { <------><------><------>ti->error = "Can't takeover a reshaping raid set"; <------><------><------>r = -EPERM; <------><------><------>goto bad; <------><------>} <------><------>/* We can't takeover a journaled raid4/5/6 */ <------><------>if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { <------><------><------>ti->error = "Can't takeover a journaled raid4/5/6 set"; <------><------><------>r = -EPERM; <------><------><------>goto bad; <------><------>} <------><------>/* <------><------> * If a takeover is needed, userspace sets any additional <------><------> * devices to rebuild and we can check for a valid request here. <------><------> * <------><------> * If acceptible, set the level to the new requested <------><------> * one, prohibit requesting recovery, allow the raid <------><------> * set to run and store superblocks during resume. <------><------> */ <------><------>r = rs_check_takeover(rs); <------><------>if (r) <------><------><------>goto bad; <------><------>r = rs_setup_takeover(rs); <------><------>if (r) <------><------><------>goto bad; <------><------>set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); <------><------>/* Takeover ain't recovery, so disable recovery */ <------><------>rs_setup_recovery(rs, MaxSector); <------><------>rs_set_new(rs); <------>} else if (rs_reshape_requested(rs)) { <------><------>/* Only request grow on raid set size extensions, not on reshapes. */ <------><------>clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); <------><------>/* <------><------> * No need to check for 'ongoing' takeover here, because takeover <------><------> * is an instant operation as oposed to an ongoing reshape. <------><------> */ <------><------>/* We can't reshape a journaled raid4/5/6 */ <------><------>if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) { <------><------><------>ti->error = "Can't reshape a journaled raid4/5/6 set"; <------><------><------>r = -EPERM; <------><------><------>goto bad; <------><------>} <------><------>/* Out-of-place space has to be available to allow for a reshape unless raid1! */ <------><------>if (reshape_sectors || rs_is_raid1(rs)) { <------><------><------>/* <------><------><------> * We can only prepare for a reshape here, because the <------><------><------> * raid set needs to run to provide the repective reshape <------><------><------> * check functions via its MD personality instance. <------><------><------> * <------><------><------> * So do the reshape check after md_run() succeeded. <------><------><------> */ <------><------><------>r = rs_prepare_reshape(rs); <------><------><------>if (r) <------><------><------><------>goto bad; <------><------><------>/* Reshaping ain't recovery, so disable recovery */ <------><------><------>rs_setup_recovery(rs, MaxSector); <------><------>} <------><------>rs_set_cur(rs); <------>} else { size_check: <------><------>/* May not set recovery when a device rebuild is requested */ <------><------>if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) { <------><------><------>clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags); <------><------><------>set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); <------><------><------>rs_setup_recovery(rs, MaxSector); <------><------>} else if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) { <------><------><------>/* <------><------><------> * Set raid set to current size, i.e. size as of <------><------><------> * superblocks to grow to larger size in preresume. <------><------><------> */ <------><------><------>r = rs_set_dev_and_array_sectors(rs, sb_array_sectors, false); <------><------><------>if (r) <------><------><------><------>goto bad; <------><------><------>rs_setup_recovery(rs, rs->md.recovery_cp < rs->md.dev_sectors ? rs->md.recovery_cp : rs->md.dev_sectors); <------><------>} else { <------><------><------>/* This is no size change or it is shrinking, update size and record in superblocks */ <------><------><------>r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false); <------><------><------>if (r) <------><------><------><------>goto bad; <------><------><------>if (sb_array_sectors > rs->array_sectors) <------><------><------><------>set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); <------><------>} <------><------>rs_set_cur(rs); <------>} <------>/* If constructor requested it, change data and new_data offsets */ <------>r = rs_adjust_data_offsets(rs); <------>if (r) <------><------>goto bad; <------>/* Catch any inconclusive reshape superblock content. */ <------>rs_reset_inconclusive_reshape(rs); <------>/* Start raid set read-only and assumed clean to change in raid_resume() */ <------>rs->md.ro = 1; <------>rs->md.in_sync = 1; <------>/* Keep array frozen until resume. */ <------>set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); <------>/* Has to be held on running the array */ <------>mddev_lock_nointr(&rs->md); <------>r = md_run(&rs->md); <------>rs->md.in_sync = 0; /* Assume already marked dirty */ <------>if (r) { <------><------>ti->error = "Failed to run raid array"; <------><------>mddev_unlock(&rs->md); <------><------>goto bad; <------>} <------>r = md_start(&rs->md); <------>if (r) { <------><------>ti->error = "Failed to start raid array"; <------><------>mddev_unlock(&rs->md); <------><------>goto bad_md_start; <------>} <------>/* If raid4/5/6 journal mode explicitly requested (only possible with journal dev) -> set it */ <------>if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) { <------><------>r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode); <------><------>if (r) { <------><------><------>ti->error = "Failed to set raid4/5/6 journal mode"; <------><------><------>mddev_unlock(&rs->md); <------><------><------>goto bad_journal_mode_set; <------><------>} <------>} <------>mddev_suspend(&rs->md); <------>set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags); <------>/* Try to adjust the raid4/5/6 stripe cache size to the stripe size */ <------>if (rs_is_raid456(rs)) { <------><------>r = rs_set_raid456_stripe_cache(rs); <------><------>if (r) <------><------><------>goto bad_stripe_cache; <------>} <------>/* Now do an early reshape check */ <------>if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { <------><------>r = rs_check_reshape(rs); <------><------>if (r) <------><------><------>goto bad_check_reshape; <------><------>/* Restore new, ctr requested layout to perform check */ <------><------>rs_config_restore(rs, &rs_layout); <------><------>if (rs->md.pers->start_reshape) { <------><------><------>r = rs->md.pers->check_reshape(&rs->md); <------><------><------>if (r) { <------><------><------><------>ti->error = "Reshape check failed"; <------><------><------><------>goto bad_check_reshape; <------><------><------>} <------><------>} <------>} <------>/* Disable/enable discard support on raid set. */ <------>configure_discard_support(rs); <------>mddev_unlock(&rs->md); <------>return 0; bad_md_start: bad_journal_mode_set: bad_stripe_cache: bad_check_reshape: <------>md_stop(&rs->md); bad: <------>raid_set_free(rs); <------>return r; } static void raid_dtr(struct dm_target *ti) { <------>struct raid_set *rs = ti->private; <------>md_stop(&rs->md); <------>raid_set_free(rs); } static int raid_map(struct dm_target *ti, struct bio *bio) { <------>struct raid_set *rs = ti->private; <------>struct mddev *mddev = &rs->md; <------>/* <------> * If we're reshaping to add disk(s)), ti->len and <------> * mddev->array_sectors will differ during the process <------> * (ti->len > mddev->array_sectors), so we have to requeue <------> * bios with addresses > mddev->array_sectors here or <------> * there will occur accesses past EOD of the component <------> * data images thus erroring the raid set. <------> */ <------>if (unlikely(bio_end_sector(bio) > mddev->array_sectors)) <------><------>return DM_MAPIO_REQUEUE; <------>md_handle_request(mddev, bio); <------>return DM_MAPIO_SUBMITTED; } /* Return sync state string for @state */ enum sync_state { st_frozen, st_reshape, st_resync, st_check, st_repair, st_recover, st_idle }; static const char *sync_str(enum sync_state state) { <------>/* Has to be in above sync_state order! */ <------>static const char *sync_strs[] = { <------><------>"frozen", <------><------>"reshape", <------><------>"resync", <------><------>"check", <------><------>"repair", <------><------>"recover", <------><------>"idle" <------>}; <------>return __within_range(state, 0, ARRAY_SIZE(sync_strs) - 1) ? sync_strs[state] : "undef"; }; /* Return enum sync_state for @mddev derived from @recovery flags */ static enum sync_state decipher_sync_action(struct mddev *mddev, unsigned long recovery) { <------>if (test_bit(MD_RECOVERY_FROZEN, &recovery)) <------><------>return st_frozen; <------>/* The MD sync thread can be done with io or be interrupted but still be running */ <------>if (!test_bit(MD_RECOVERY_DONE, &recovery) && <------> (test_bit(MD_RECOVERY_RUNNING, &recovery) || <------> (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery)))) { <------><------>if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) <------><------><------>return st_reshape; <------><------>if (test_bit(MD_RECOVERY_SYNC, &recovery)) { <------><------><------>if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) <------><------><------><------>return st_resync; <------><------><------>if (test_bit(MD_RECOVERY_CHECK, &recovery)) <------><------><------><------>return st_check; <------><------><------>return st_repair; <------><------>} <------><------>if (test_bit(MD_RECOVERY_RECOVER, &recovery)) <------><------><------>return st_recover; <------><------>if (mddev->reshape_position != MaxSector) <------><------><------>return st_reshape; <------>} <------>return st_idle; } /* * Return status string for @rdev * * Status characters: * * 'D' = Dead/Failed raid set component or raid4/5/6 journal device * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr) */ static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev) { <------>if (!rdev->bdev) <------><------>return "-"; <------>else if (test_bit(Faulty, &rdev->flags)) <------><------>return "D"; <------>else if (test_bit(Journal, &rdev->flags)) <------><------>return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a"; <------>else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags) || <------><------> (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) && <------><------> !test_bit(In_sync, &rdev->flags))) <------><------>return "a"; <------>else <------><------>return "A"; } /* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */ static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery, <------><------><------><------>enum sync_state state, sector_t resync_max_sectors) { <------>sector_t r; <------>struct mddev *mddev = &rs->md; <------>clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------>clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); <------>if (rs_is_raid0(rs)) { <------><------>r = resync_max_sectors; <------><------>set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------>} else { <------><------>if (state == st_idle && !test_bit(MD_RECOVERY_INTR, &recovery)) <------><------><------>r = mddev->recovery_cp; <------><------>else <------><------><------>r = mddev->curr_resync_completed; <------><------>if (state == st_idle && r >= resync_max_sectors) { <------><------><------>/* <------><------><------> * Sync complete. <------><------><------> */ <------><------><------>/* In case we have finished recovering, the array is in sync. */ <------><------><------>if (test_bit(MD_RECOVERY_RECOVER, &recovery)) <------><------><------><------>set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------><------>} else if (state == st_recover) <------><------><------>/* <------><------><------> * In case we are recovering, the array is not in sync <------><------><------> * and health chars should show the recovering legs. <------><------><------> * <------><------><------> * Already retrieved recovery offset from curr_resync_completed above. <------><------><------> */ <------><------><------>; <------><------>else if (state == st_resync || state == st_reshape) <------><------><------>/* <------><------><------> * If "resync/reshape" is occurring, the raid set <------><------><------> * is or may be out of sync hence the health <------><------><------> * characters shall be 'a'. <------><------><------> */ <------><------><------>set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); <------><------>else if (state == st_check || state == st_repair) <------><------><------>/* <------><------><------> * If "check" or "repair" is occurring, the raid set has <------><------><------> * undergone an initial sync and the health characters <------><------><------> * should not be 'a' anymore. <------><------><------> */ <------><------><------>set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------><------>else if (test_bit(MD_RECOVERY_NEEDED, &recovery)) <------><------><------>/* <------><------><------> * We are idle and recovery is needed, prevent 'A' chars race <------><------><------> * caused by components still set to in-sync by constructor. <------><------><------> */ <------><------><------>set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags); <------><------>else { <------><------><------>/* <------><------><------> * We are idle and the raid set may be doing an initial <------><------><------> * sync, or it may be rebuilding individual components. <------><------><------> * If all the devices are In_sync, then it is the raid set <------><------><------> * that is being initialized. <------><------><------> */ <------><------><------>struct md_rdev *rdev; <------><------><------>set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------><------><------>rdev_for_each(rdev, mddev) <------><------><------><------>if (!test_bit(Journal, &rdev->flags) && <------><------><------><------> !test_bit(In_sync, &rdev->flags)) { <------><------><------><------><------>clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags); <------><------><------><------><------>break; <------><------><------><------>} <------><------>} <------>} <------>return min(r, resync_max_sectors); } /* Helper to return @dev name or "-" if !@dev */ static const char *__get_dev_name(struct dm_dev *dev) { <------>return dev ? dev->name : "-"; } static void raid_status(struct dm_target *ti, status_type_t type, <------><------><------>unsigned int status_flags, char *result, unsigned int maxlen) { <------>struct raid_set *rs = ti->private; <------>struct mddev *mddev = &rs->md; <------>struct r5conf *conf = mddev->private; <------>int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0; <------>unsigned long recovery; <------>unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */ <------>unsigned int sz = 0; <------>unsigned int rebuild_writemostly_count = 0; <------>sector_t progress, resync_max_sectors, resync_mismatches; <------>enum sync_state state; <------>struct raid_type *rt; <------>switch (type) { <------>case STATUSTYPE_INFO: <------><------>/* *Should* always succeed */ <------><------>rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); <------><------>if (!rt) <------><------><------>return; <------><------>DMEMIT("%s %d ", rt->name, mddev->raid_disks); <------><------>/* Access most recent mddev properties for status output */ <------><------>smp_rmb(); <------><------>/* Get sensible max sectors even if raid set not yet started */ <------><------>resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ? <------><------><------><------> mddev->resync_max_sectors : mddev->dev_sectors; <------><------>recovery = rs->md.recovery; <------><------>state = decipher_sync_action(mddev, recovery); <------><------>progress = rs_get_progress(rs, recovery, state, resync_max_sectors); <------><------>resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ? <------><------><------><------> atomic64_read(&mddev->resync_mismatches) : 0; <------><------>/* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */ <------><------>for (i = 0; i < rs->raid_disks; i++) <------><------><------>DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev)); <------><------>/* <------><------> * In-sync/Reshape ratio: <------><------> * The in-sync ratio shows the progress of: <------><------> * - Initializing the raid set <------><------> * - Rebuilding a subset of devices of the raid set <------><------> * The user can distinguish between the two by referring <------><------> * to the status characters. <------><------> * <------><------> * The reshape ratio shows the progress of <------><------> * changing the raid layout or the number of <------><------> * disks of a raid set <------><------> */ <------><------>DMEMIT(" %llu/%llu", (unsigned long long) progress, <------><------><------><------> (unsigned long long) resync_max_sectors); <------><------>/* <------><------> * v1.5.0+: <------><------> * <------><------> * Sync action: <------><------> * See Documentation/admin-guide/device-mapper/dm-raid.rst for <------><------> * information on each of these states. <------><------> */ <------><------>DMEMIT(" %s", sync_str(state)); <------><------>/* <------><------> * v1.5.0+: <------><------> * <------><------> * resync_mismatches/mismatch_cnt <------><------> * This field shows the number of discrepancies found when <------><------> * performing a "check" of the raid set. <------><------> */ <------><------>DMEMIT(" %llu", (unsigned long long) resync_mismatches); <------><------>/* <------><------> * v1.9.0+: <------><------> * <------><------> * data_offset (needed for out of space reshaping) <------><------> * This field shows the data offset into the data <------><------> * image LV where the first stripes data starts. <------><------> * <------><------> * We keep data_offset equal on all raid disks of the set, <------><------> * so retrieving it from the first raid disk is sufficient. <------><------> */ <------><------>DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset); <------><------>/* <------><------> * v1.10.0+: <------><------> */ <------><------>DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? <------><------><------> __raid_dev_status(rs, &rs->journal_dev.rdev) : "-"); <------><------>break; <------>case STATUSTYPE_TABLE: <------><------>/* Report the table line string you would use to construct this raid set */ <------><------>/* <------><------> * Count any rebuild or writemostly argument pairs and subtract the <------><------> * hweight count being added below of any rebuild and writemostly ctr flags. <------><------> */ <------><------>for (i = 0; i < rs->raid_disks; i++) { <------><------><------>rebuild_writemostly_count += (test_bit(i, (void *) rs->rebuild_disks) ? 2 : 0) + <------><------><------><------><------><------> (test_bit(WriteMostly, &rs->dev[i].rdev.flags) ? 2 : 0); <------><------>} <------><------>rebuild_writemostly_count -= (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) ? 2 : 0) + <------><------><------><------><------> (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags) ? 2 : 0); <------><------>/* Calculate raid parameter count based on ^ rebuild/writemostly argument counts and ctr flags set. */ <------><------>raid_param_cnt += rebuild_writemostly_count + <------><------><------><------> hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) + <------><------><------><------> hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2; <------><------>/* Emit table line */ <------><------>/* This has to be in the documented order for userspace! */ <------><------>DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors); <------><------>if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC)); <------><------>if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC)); <------><------>if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) <------><------><------>for (i = 0; i < rs->raid_disks; i++) <------><------><------><------>if (test_bit(i, (void *) rs->rebuild_disks)) <------><------><------><------><------>DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), i); <------><------>if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP), <------><------><------><------><------> mddev->bitmap_info.daemon_sleep); <------><------>if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE), <------><------><------><------><------> mddev->sync_speed_min); <------><------>if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE), <------><------><------><------><------> mddev->sync_speed_max); <------><------>if (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags)) <------><------><------>for (i = 0; i < rs->raid_disks; i++) <------><------><------><------>if (test_bit(WriteMostly, &rs->dev[i].rdev.flags)) <------><------><------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY), <------><------><------><------><------> rs->dev[i].rdev.raid_disk); <------><------>if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND), <------><------><------><------><------> mddev->bitmap_info.max_write_behind); <------><------>if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE), <------><------><------><------><------> max_nr_stripes); <------><------>if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE), <------><------><------><------><------> (unsigned long long) to_sector(mddev->bitmap_info.chunksize)); <------><------>if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES), <------><------><------><------><------> raid10_md_layout_to_copies(mddev->layout)); <------><------>if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT), <------><------><------><------><------> raid10_md_layout_to_format(mddev->layout)); <------><------>if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS), <------><------><------><------><------> max(rs->delta_disks, mddev->delta_disks)); <------><------>if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET), <------><------><------><------><------> (unsigned long long) rs->data_offset); <------><------>if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV), <------><------><------><------><------>__get_dev_name(rs->journal_dev.dev)); <------><------>if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) <------><------><------>DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE), <------><------><------><------><------> md_journal_mode_to_dm_raid(rs->journal_dev.mode)); <------><------>DMEMIT(" %d", rs->raid_disks); <------><------>for (i = 0; i < rs->raid_disks; i++) <------><------><------>DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev), <------><------><------><------><------> __get_dev_name(rs->dev[i].data_dev)); <------>} } static int raid_message(struct dm_target *ti, unsigned int argc, char **argv, <------><------><------>char *result, unsigned maxlen) { <------>struct raid_set *rs = ti->private; <------>struct mddev *mddev = &rs->md; <------>if (!mddev->pers || !mddev->pers->sync_request) <------><------>return -EINVAL; <------>if (!strcasecmp(argv[0], "frozen")) <------><------>set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); <------>else <------><------>clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); <------>if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { <------><------>if (mddev->sync_thread) { <------><------><------>set_bit(MD_RECOVERY_INTR, &mddev->recovery); <------><------><------>md_reap_sync_thread(mddev); <------><------>} <------>} else if (decipher_sync_action(mddev, mddev->recovery) != st_idle) <------><------>return -EBUSY; <------>else if (!strcasecmp(argv[0], "resync")) <------><------>; /* MD_RECOVERY_NEEDED set below */ <------>else if (!strcasecmp(argv[0], "recover")) <------><------>set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); <------>else { <------><------>if (!strcasecmp(argv[0], "check")) { <------><------><------>set_bit(MD_RECOVERY_CHECK, &mddev->recovery); <------><------><------>set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); <------><------><------>set_bit(MD_RECOVERY_SYNC, &mddev->recovery); <------><------>} else if (!strcasecmp(argv[0], "repair")) { <------><------><------>set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); <------><------><------>set_bit(MD_RECOVERY_SYNC, &mddev->recovery); <------><------>} else <------><------><------>return -EINVAL; <------>} <------>if (mddev->ro == 2) { <------><------>/* A write to sync_action is enough to justify <------><------> * canceling read-auto mode <------><------> */ <------><------>mddev->ro = 0; <------><------>if (!mddev->suspended && mddev->sync_thread) <------><------><------>md_wakeup_thread(mddev->sync_thread); <------>} <------>set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); <------>if (!mddev->suspended && mddev->thread) <------><------>md_wakeup_thread(mddev->thread); <------>return 0; } static int raid_iterate_devices(struct dm_target *ti, <------><------><------><------>iterate_devices_callout_fn fn, void *data) { <------>struct raid_set *rs = ti->private; <------>unsigned int i; <------>int r = 0; <------>for (i = 0; !r && i < rs->md.raid_disks; i++) <------><------>if (rs->dev[i].data_dev) <------><------><------>r = fn(ti, <------><------><------><------> rs->dev[i].data_dev, <------><------><------><------> 0, /* No offset on data devs */ <------><------><------><------> rs->md.dev_sectors, <------><------><------><------> data); <------>return r; } static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) { <------>struct raid_set *rs = ti->private; <------>unsigned int chunk_size_bytes = to_bytes(rs->md.chunk_sectors); <------>blk_limits_io_min(limits, chunk_size_bytes); <------>blk_limits_io_opt(limits, chunk_size_bytes * mddev_data_stripes(rs)); <------>/* <------> * RAID0 and RAID10 personalities require bio splitting, <------> * RAID1/4/5/6 don't and process large discard bios properly. <------> */ <------>if (rs_is_raid0(rs) || rs_is_raid10(rs)) { <------><------>limits->discard_granularity = chunk_size_bytes; <------><------>limits->max_discard_sectors = rs->md.chunk_sectors; <------>} } static void raid_postsuspend(struct dm_target *ti) { <------>struct raid_set *rs = ti->private; <------>if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) { <------><------>/* Writes have to be stopped before suspending to avoid deadlocks. */ <------><------>if (!test_bit(MD_RECOVERY_FROZEN, &rs->md.recovery)) <------><------><------>md_stop_writes(&rs->md); <------><------>mddev_lock_nointr(&rs->md); <------><------>mddev_suspend(&rs->md); <------><------>mddev_unlock(&rs->md); <------>} } static void attempt_restore_of_faulty_devices(struct raid_set *rs) { <------>int i; <------>uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS]; <------>unsigned long flags; <------>bool cleared = false; <------>struct dm_raid_superblock *sb; <------>struct mddev *mddev = &rs->md; <------>struct md_rdev *r; <------>/* RAID personalities have to provide hot add/remove methods or we need to bail out. */ <------>if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk) <------><------>return; <------>memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices)); <------>for (i = 0; i < mddev->raid_disks; i++) { <------><------>r = &rs->dev[i].rdev; <------><------>/* HM FIXME: enhance journal device recovery processing */ <------><------>if (test_bit(Journal, &r->flags)) <------><------><------>continue; <------><------>if (test_bit(Faulty, &r->flags) && <------><------> r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) { <------><------><------>DMINFO("Faulty %s device #%d has readable super block." <------><------><------> " Attempting to revive it.", <------><------><------> rs->raid_type->name, i); <------><------><------>/* <------><------><------> * Faulty bit may be set, but sometimes the array can <------><------><------> * be suspended before the personalities can respond <------><------><------> * by removing the device from the array (i.e. calling <------><------><------> * 'hot_remove_disk'). If they haven't yet removed <------><------><------> * the failed device, its 'raid_disk' number will be <------><------><------> * '>= 0' - meaning we must call this function <------><------><------> * ourselves. <------><------><------> */ <------><------><------>flags = r->flags; <------><------><------>clear_bit(In_sync, &r->flags); /* Mandatory for hot remove. */ <------><------><------>if (r->raid_disk >= 0) { <------><------><------><------>if (mddev->pers->hot_remove_disk(mddev, r)) { <------><------><------><------><------>/* Failed to revive this device, try next */ <------><------><------><------><------>r->flags = flags; <------><------><------><------><------>continue; <------><------><------><------>} <------><------><------>} else <------><------><------><------>r->raid_disk = r->saved_raid_disk = i; <------><------><------>clear_bit(Faulty, &r->flags); <------><------><------>clear_bit(WriteErrorSeen, &r->flags); <------><------><------>if (mddev->pers->hot_add_disk(mddev, r)) { <------><------><------><------>/* Failed to revive this device, try next */ <------><------><------><------>r->raid_disk = r->saved_raid_disk = -1; <------><------><------><------>r->flags = flags; <------><------><------>} else { <------><------><------><------>clear_bit(In_sync, &r->flags); <------><------><------><------>r->recovery_offset = 0; <------><------><------><------>set_bit(i, (void *) cleared_failed_devices); <------><------><------><------>cleared = true; <------><------><------>} <------><------>} <------>} <------>/* If any failed devices could be cleared, update all sbs failed_devices bits */ <------>if (cleared) { <------><------>uint64_t failed_devices[DISKS_ARRAY_ELEMS]; <------><------>rdev_for_each(r, &rs->md) { <------><------><------>if (test_bit(Journal, &r->flags)) <------><------><------><------>continue; <------><------><------>sb = page_address(r->sb_page); <------><------><------>sb_retrieve_failed_devices(sb, failed_devices); <------><------><------>for (i = 0; i < DISKS_ARRAY_ELEMS; i++) <------><------><------><------>failed_devices[i] &= ~cleared_failed_devices[i]; <------><------><------>sb_update_failed_devices(sb, failed_devices); <------><------>} <------>} } static int __load_dirty_region_bitmap(struct raid_set *rs) { <------>int r = 0; <------>/* Try loading the bitmap unless "raid0", which does not have one */ <------>if (!rs_is_raid0(rs) && <------> !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) { <------><------>r = md_bitmap_load(&rs->md); <------><------>if (r) <------><------><------>DMERR("Failed to load bitmap"); <------>} <------>return r; } /* Enforce updating all superblocks */ static void rs_update_sbs(struct raid_set *rs) { <------>struct mddev *mddev = &rs->md; <------>int ro = mddev->ro; <------>set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); <------>mddev->ro = 0; <------>md_update_sb(mddev, 1); <------>mddev->ro = ro; } /* * Reshape changes raid algorithm of @rs to new one within personality * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes * disks from a raid set thus growing/shrinking it or resizes the set * * Call mddev_lock_nointr() before! */ static int rs_start_reshape(struct raid_set *rs) { <------>int r; <------>struct mddev *mddev = &rs->md; <------>struct md_personality *pers = mddev->pers; <------>/* Don't allow the sync thread to work until the table gets reloaded. */ <------>set_bit(MD_RECOVERY_WAIT, &mddev->recovery); <------>r = rs_setup_reshape(rs); <------>if (r) <------><------>return r; <------>/* <------> * Check any reshape constraints enforced by the personalility <------> * <------> * May as well already kick the reshape off so that * pers->start_reshape() becomes optional. <------> */ <------>r = pers->check_reshape(mddev); <------>if (r) { <------><------>rs->ti->error = "pers->check_reshape() failed"; <------><------>return r; <------>} <------>/* <------> * Personality may not provide start reshape method in which <------> * case check_reshape above has already covered everything <------> */ <------>if (pers->start_reshape) { <------><------>r = pers->start_reshape(mddev); <------><------>if (r) { <------><------><------>rs->ti->error = "pers->start_reshape() failed"; <------><------><------>return r; <------><------>} <------>} <------>/* <------> * Now reshape got set up, update superblocks to <------> * reflect the fact so that a table reload will <------> * access proper superblock content in the ctr. <------> */ <------>rs_update_sbs(rs); <------>return 0; } static int raid_preresume(struct dm_target *ti) { <------>int r; <------>struct raid_set *rs = ti->private; <------>struct mddev *mddev = &rs->md; <------>/* This is a resume after a suspend of the set -> it's already started. */ <------>if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags)) <------><------>return 0; <------>/* <------> * The superblocks need to be updated on disk if the <------> * array is new or new devices got added (thus zeroed <------> * out by userspace) or __load_dirty_region_bitmap <------> * will overwrite them in core with old data or fail. <------> */ <------>if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags)) <------><------>rs_update_sbs(rs); <------>/* Load the bitmap from disk unless raid0 */ <------>r = __load_dirty_region_bitmap(rs); <------>if (r) <------><------>return r; <------>/* We are extending the raid set size, adjust mddev/md_rdev sizes and set capacity. */ <------>if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) { <------><------>mddev->array_sectors = rs->array_sectors; <------><------>mddev->dev_sectors = rs->dev_sectors; <------><------>rs_set_rdev_sectors(rs); <------><------>rs_set_capacity(rs); <------>} <------>/* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) or grown device size */ if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap && <------> (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) || <------> (rs->requested_bitmap_chunk_sectors && <------> mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) { <------><------>int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize; <------><------>r = md_bitmap_resize(mddev->bitmap, mddev->dev_sectors, chunksize, 0); <------><------>if (r) <------><------><------>DMERR("Failed to resize bitmap"); <------>} <------>/* Check for any resize/reshape on @rs and adjust/initiate */ <------>/* Be prepared for mddev_resume() in raid_resume() */ <------>set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); <------>if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) { <------><------>set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); <------><------>mddev->resync_min = mddev->recovery_cp; <------><------>if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) <------><------><------>mddev->resync_max_sectors = mddev->dev_sectors; <------>} <------>/* Check for any reshape request unless new raid set */ <------>if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { <------><------>/* Initiate a reshape. */ <------><------>rs_set_rdev_sectors(rs); <------><------>mddev_lock_nointr(mddev); <------><------>r = rs_start_reshape(rs); <------><------>mddev_unlock(mddev); <------><------>if (r) <------><------><------>DMWARN("Failed to check/start reshape, continuing without change"); <------><------>r = 0; <------>} <------>return r; } static void raid_resume(struct dm_target *ti) { <------>struct raid_set *rs = ti->private; <------>struct mddev *mddev = &rs->md; <------>if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) { <------><------>/* <------><------> * A secondary resume while the device is active. <------><------> * Take this opportunity to check whether any failed <------><------> * devices are reachable again. <------><------> */ <------><------>attempt_restore_of_faulty_devices(rs); <------>} <------>if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) { <------><------>/* Only reduce raid set size before running a disk removing reshape. */ <------><------>if (mddev->delta_disks < 0) <------><------><------>rs_set_capacity(rs); <------><------>mddev_lock_nointr(mddev); <------><------>clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); <------><------>mddev->ro = 0; <------><------>mddev->in_sync = 0; <------><------>mddev_resume(mddev); <------><------>mddev_unlock(mddev); <------>} } static struct target_type raid_target = { <------>.name = "raid", <------>.version = {1, 15, 1}, <------>.module = THIS_MODULE, <------>.ctr = raid_ctr, <------>.dtr = raid_dtr, <------>.map = raid_map, <------>.status = raid_status, <------>.message = raid_message, <------>.iterate_devices = raid_iterate_devices, <------>.io_hints = raid_io_hints, <------>.postsuspend = raid_postsuspend, <------>.preresume = raid_preresume, <------>.resume = raid_resume, }; static int __init dm_raid_init(void) { <------>DMINFO("Loading target version %u.%u.%u", <------> raid_target.version[0], <------> raid_target.version[1], <------> raid_target.version[2]); <------>return dm_register_target(&raid_target); } static void __exit dm_raid_exit(void) { <------>dm_unregister_target(&raid_target); } module_init(dm_raid_init); module_exit(dm_raid_exit); module_param(devices_handle_discard_safely, bool, 0644); MODULE_PARM_DESC(devices_handle_discard_safely, <------><------> "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target"); MODULE_ALIAS("dm-raid0"); MODULE_ALIAS("dm-raid1"); MODULE_ALIAS("dm-raid10"); MODULE_ALIAS("dm-raid4"); MODULE_ALIAS("dm-raid5"); MODULE_ALIAS("dm-raid6"); MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>"); MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags
| Donate