diff options
Diffstat (limited to 'drivers/md/md.h')
| -rw-r--r-- | drivers/md/md.h | 622 |
1 files changed, 476 insertions, 146 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index c52afb52c776..6985f2829bbd 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -1,15 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* md.h : kernel internal structure of the Linux MD driver Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - You should have received a copy of the GNU General Public License - (for example /usr/src/linux/COPYING); if not, write to the Free - Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _MD_MD_H @@ -25,10 +18,38 @@ #include <linux/timer.h> #include <linux/wait.h> #include <linux/workqueue.h> -#include "md-cluster.h" +#include <linux/raid/md_u.h> +#include <trace/events/block.h> #define MaxSector (~(sector_t)0) +enum md_submodule_type { + MD_PERSONALITY = 0, + MD_CLUSTER, + MD_BITMAP, +}; + +enum md_submodule_id { + ID_LINEAR = LEVEL_LINEAR, + ID_RAID0 = 0, + ID_RAID1 = 1, + ID_RAID4 = 4, + ID_RAID5 = 5, + ID_RAID6 = 6, + ID_RAID10 = 10, + ID_CLUSTER, + ID_BITMAP, + ID_LLBITMAP, + ID_BITMAP_NONE, +}; + +struct md_submodule_head { + enum md_submodule_type type; + enum md_submodule_id id; + const char *name; + struct module *owner; +}; + /* * These flags should really be called "NO_RETRY" rather than * "FAILFAST" because they don't make any promise about time lapse, @@ -39,6 +60,71 @@ * be retried. */ #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) + +/* Status of sync thread. */ +enum sync_action { + /* + * Represent by MD_RECOVERY_SYNC, start when: + * 1) after assemble, sync data from first rdev to other copies, this + * must be done first before other sync actions and will only execute + * once; + * 2) resize the array(notice that this is not reshape), sync data for + * the new range; + */ + ACTION_RESYNC, + /* + * Represent by MD_RECOVERY_RECOVER, start when: + * 1) for new replacement, sync data based on the replace rdev or + * available copies from other rdev; + * 2) for new member disk while the array is degraded, sync data from + * other rdev; + * 3) reassemble after power failure or re-add a hot removed rdev, sync + * data from first rdev to other copies based on bitmap; + */ + ACTION_RECOVER, + /* + * Represent by MD_RECOVERY_SYNC | MD_RECOVERY_REQUESTED | + * MD_RECOVERY_CHECK, start when user echo "check" to sysfs api + * sync_action, used to check if data copies from differenct rdev are + * the same. The number of mismatch sectors will be exported to user + * by sysfs api mismatch_cnt; + */ + ACTION_CHECK, + /* + * Represent by MD_RECOVERY_SYNC | MD_RECOVERY_REQUESTED, start when + * user echo "repair" to sysfs api sync_action, usually paired with + * ACTION_CHECK, used to force syncing data once user found that there + * are inconsistent data, + */ + ACTION_REPAIR, + /* + * Represent by MD_RECOVERY_RESHAPE, start when new member disk is added + * to the conf, notice that this is different from spares or + * replacement; + */ + ACTION_RESHAPE, + /* + * Represent by MD_RECOVERY_FROZEN, can be set by sysfs api sync_action + * or internal usage like setting the array read-only, will forbid above + * actions. + */ + ACTION_FROZEN, + /* + * All above actions don't match. + */ + ACTION_IDLE, + NR_SYNC_ACTIONS, +}; + +/* + * The struct embedded in rdev is used to serialize IO. + */ +struct serial_in_rdev { + struct rb_root_cached serial_rb; + spinlock_t serial_lock; + wait_queue_head_t serial_io_wait; +}; + /* * MD's 'extended' device */ @@ -47,7 +133,7 @@ struct md_rdev { sector_t sectors; /* Device size (in 512bytes sectors) */ struct mddev *mddev; /* RAID array if running */ - int last_events; /* IO event timestamp */ + unsigned long last_events; /* IO event timestamp */ /* * If meta_bdev is non-NULL, it means that a separate device is @@ -56,6 +142,7 @@ struct md_rdev { */ struct block_device *meta_bdev; struct block_device *bdev; /* block device handle */ + struct file *bdev_file; /* Handle from open for bdev */ struct page *sb_page, *bb_page; int sb_loaded; @@ -116,11 +203,15 @@ struct md_rdev { * for reporting to userspace and storing * in superblock. */ - struct work_struct del_work; /* used for delayed sysfs removal */ + + struct serial_in_rdev *serial; /* used for raid1 io serialization */ struct kernfs_node *sysfs_state; /* handle for 'state' * sysfs entry */ - + /* handle for 'unacknowledged_bad_blocks' sysfs dentry */ + struct kernfs_node *sysfs_unack_badblocks; + /* handle for 'bad_blocks' sysfs dentry */ + struct kernfs_node *sysfs_badblocks; struct badblocks badblocks; struct { @@ -182,11 +273,6 @@ enum flag_bits { * than other devices in the array */ ClusterRemove, - RemoveSynchronized, /* synchronize_rcu() was called after - * this device was known to be faulty, - * so it is safe to remove without - * another synchronize_rcu() call. - */ ExternalBbl, /* External metadata provides bad * block management for a disk */ @@ -200,10 +286,15 @@ enum flag_bits { * it didn't fail, so don't use FailFast * any more for metadata */ + CollisionCheck, /* + * check if there is collision between raid1 + * serial bios. + */ + Nonrot, /* non-rotational device (SSD) */ }; -static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, - sector_t *first_bad, int *bad_sectors) +static inline int is_badblock(struct md_rdev *rdev, sector_t s, sector_t sectors, + sector_t *first_bad, sector_t *bad_sectors) { if (unlikely(rdev->badblocks.count)) { int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, @@ -215,34 +306,56 @@ static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, } return 0; } -extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, - int is_new); -extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, - int is_new); -struct md_cluster_info; -/* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */ +static inline int rdev_has_badblock(struct md_rdev *rdev, sector_t s, + int sectors) +{ + sector_t first_bad; + sector_t bad_sectors; + + return is_badblock(rdev, s, sectors, &first_bad, &bad_sectors); +} + +extern bool rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new); +extern void rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new); +struct md_cluster_info; +struct md_cluster_operations; + +/** + * enum mddev_flags - md device flags. + * @MD_ARRAY_FIRST_USE: First use of array, needs initialization. + * @MD_CLOSING: If set, we are closing the array, do not open it then. + * @MD_JOURNAL_CLEAN: A raid with journal is already clean. + * @MD_HAS_JOURNAL: The raid array has journal feature set. + * @MD_CLUSTER_RESYNC_LOCKED: cluster raid only, which means node, already took + * resync lock, need to release the lock. + * @MD_FAILFAST_SUPPORTED: Using MD_FAILFAST on metadata writes is supported as + * calls to md_error() will never cause the array to + * become failed. + * @MD_HAS_PPL: The raid array has PPL feature set. + * @MD_HAS_MULTIPLE_PPLS: The raid array has multiple PPLs feature set. + * @MD_NOT_READY: do_md_run() is active, so 'array_state', ust not report that + * array is ready yet. + * @MD_BROKEN: This is used to stop writes and mark array as failed. + * @MD_DELETED: This device is being deleted + * + * change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added + */ enum mddev_flags { - MD_ARRAY_FIRST_USE, /* First use of array, needs initialization */ - MD_CLOSING, /* If set, we are closing the array, do not open - * it then */ - MD_JOURNAL_CLEAN, /* A raid with journal is already clean */ - MD_HAS_JOURNAL, /* The raid array has journal feature set */ - MD_CLUSTER_RESYNC_LOCKED, /* cluster raid only, which means node - * already took resync lock, need to - * release the lock */ - MD_FAILFAST_SUPPORTED, /* Using MD_FAILFAST on metadata writes is - * supported as calls to md_error() will - * never cause the array to become failed. - */ - MD_HAS_PPL, /* The raid array has PPL feature set */ - MD_HAS_MULTIPLE_PPLS, /* The raid array has multiple PPLs feature set */ - MD_ALLOW_SB_UPDATE, /* md_check_recovery is allowed to update - * the metadata without taking reconfig_mutex. - */ - MD_UPDATING_SB, /* md_check_recovery is updating the metadata - * without explicitly holding reconfig_mutex. - */ + MD_ARRAY_FIRST_USE, + MD_CLOSING, + MD_JOURNAL_CLEAN, + MD_HAS_JOURNAL, + MD_CLUSTER_RESYNC_LOCKED, + MD_FAILFAST_SUPPORTED, + MD_HAS_PPL, + MD_HAS_MULTIPLE_PPLS, + MD_NOT_READY, + MD_BROKEN, + MD_DO_DELETE, + MD_DELETED, }; enum mddev_sb_flags { @@ -252,17 +365,28 @@ enum mddev_sb_flags { MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ }; -#define NR_FLUSH_INFOS 8 -#define NR_FLUSH_BIOS 64 -struct flush_info { - struct bio *bio; - struct mddev *mddev; - struct work_struct flush_work; - atomic_t flush_pending; +#define NR_SERIAL_INFOS 8 +/* record current range of serialize IOs */ +struct serial_info { + struct rb_node node; + sector_t start; /* start sector of rb node */ + sector_t last; /* end sector of rb node */ + sector_t _subtree_last; /* highest sector in subtree of rb node */ }; -struct flush_bio { - struct flush_info *fi; - struct md_rdev *rdev; + +/* + * mddev->curr_resync stores the current sector of the resync but + * also has some overloaded values. + */ +enum { + /* No resync in progress */ + MD_RESYNC_NONE = 0, + /* Yielded to allow another conflicting resync to commence */ + MD_RESYNC_YIELDED = 1, + /* Delayed to check that there is no conflict with another sync */ + MD_RESYNC_DELAYED = 2, + /* Any value greater than or equal to this is in an active resync */ + MD_RESYNC_ACTIVE = 3, }; struct mddev { @@ -275,13 +399,15 @@ struct mddev { unsigned long sb_flags; int suspended; - atomic_t active_io; + struct mutex suspend_mutex; + struct percpu_ref active_io; int ro; int sysfs_active; /* set when sysfs deletes * are happening, so run/ * takeover/stop are not safe */ - struct gendisk *gendisk; + struct gendisk *gendisk; /* mdraid gendisk */ + struct gendisk *dm_gendisk; /* dm-raid gendisk */ struct kobject kobj; int hold_active; @@ -307,6 +433,7 @@ struct mddev { sector_t array_sectors; /* exported array size */ int external_size; /* size managed * externally */ + unsigned int logical_block_size; __u64 events; /* If the last 'event' was simply a clean->dirty transition, and * we didn't write it to the spares, then it is safe and simple @@ -327,16 +454,15 @@ struct mddev { int new_chunk_sectors; int reshape_backwards; - struct md_thread *thread; /* management thread */ - struct md_thread *sync_thread; /* doing resync or reconstruct */ + struct md_thread __rcu *thread; /* management thread */ + struct md_thread __rcu *sync_thread; /* doing resync or reconstruct */ - /* 'last_sync_action' is initialized to "none". It is set when a - * sync operation (i.e "data-check", "requested-resync", "resync", - * "recovery", or "reshape") is started. It holds this value even + /* + * Set when a sync operation is started. It holds this value even * when the sync thread is "frozen" (interrupted) or "idle" (stopped - * or finished). It is overwritten when a new sync operation is begun. + * or finished). It is overwritten when a new sync operation is begun. */ - char *last_sync_action; + enum sync_action last_sync_action; sector_t curr_resync; /* last block scheduled */ /* As resync requests can complete out of order, we cannot easily track * how much resync has been completed. So we occasionally pause until @@ -361,6 +487,7 @@ struct mddev { /* if zero, use the system-wide default */ int sync_speed_min; int sync_speed_max; + int sync_io_depth; /* resync even though the same disks are shared among md-devices */ int parallel_resync; @@ -380,10 +507,10 @@ struct mddev { * that we are never stopping an array while it is open. * 'reconfig_mutex' protects all other reconfiguration. * These locks are separate due to conflicting interactions - * with bdev->bd_mutex. + * with disk->open_mutex. * Lock ordering is: - * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk - * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open + * reconfig_mutex -> disk->open_mutex + * disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open */ struct mutex open_mutex; struct mutex reconfig_mutex; @@ -396,9 +523,10 @@ struct mddev { * adding a spare */ + unsigned long normal_io_events; /* IO event timestamp */ atomic_t recovery_active; /* blocks scheduled, but not written */ wait_queue_head_t recovery_wait; - sector_t recovery_cp; + sector_t resync_offset; sector_t resync_min; /* user requested sync * starts here */ sector_t resync_max; /* resync should pause @@ -408,8 +536,14 @@ struct mddev { * file in sysfs. */ struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ + struct kernfs_node *sysfs_completed; /*handle for 'sync_completed' */ + struct kernfs_node *sysfs_degraded; /*handle for 'degraded' */ + struct kernfs_node *sysfs_level; /*handle for 'level' */ - struct work_struct del_work; /* used for delayed sysfs removal */ + /* used for delayed sysfs removal */ + struct work_struct del_work; + /* used for register new sync thread */ + struct work_struct sync_work; /* "lock" protects: * flush_bio transition from NULL to !NULL @@ -433,9 +567,10 @@ struct mddev { struct timer_list safemode_timer; struct percpu_ref writes_pending; int sync_checkers; /* # of threads checking writes_pending */ - struct request_queue *queue; /* for plugging ... */ - struct bitmap *bitmap; /* the bitmap for the device */ + enum md_submodule_id bitmap_id; + void *bitmap; /* the bitmap for the device */ + struct bitmap_operations *bitmap_ops; struct { struct file *file; /* the bitmap file */ loff_t offset; /* offset from superblock of @@ -463,49 +598,134 @@ struct mddev { atomic_t max_corr_read_errors; /* max read retries */ struct list_head all_mddevs; - struct attribute_group *to_remove; + const struct attribute_group *to_remove; struct bio_set bio_set; struct bio_set sync_set; /* for sync operations like * metadata and bitmap writes */ + struct bio_set io_clone_set; - mempool_t *flush_pool; - mempool_t *flush_bio_pool; struct work_struct event_work; /* used by dm to report failure event */ + mempool_t *serial_info_pool; void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); struct md_cluster_info *cluster_info; + struct md_cluster_operations *cluster_ops; unsigned int good_device_nr; /* good device num within cluster raid */ + unsigned int noio_flag; /* for memalloc scope API */ + + /* + * Temporarily store rdev that will be finally removed when + * reconfig_mutex is unlocked, protected by reconfig_mutex. + */ + struct list_head deleting; + + /* The sequence number for sync thread */ + atomic_t sync_seq; bool has_superblocks:1; + bool fail_last_dev:1; + bool serialize_policy:1; }; enum recovery_flags { + /* flags for sync thread running status */ + + /* + * set when one of sync action is set and new sync thread need to be + * registered, or just add/remove spares from conf. + */ + MD_RECOVERY_NEEDED, + /* sync thread is running, or about to be started */ + MD_RECOVERY_RUNNING, + /* sync thread needs to be aborted for some reason */ + MD_RECOVERY_INTR, + /* sync thread is done and is waiting to be unregistered */ + MD_RECOVERY_DONE, + /* running sync thread must abort immediately, and not restart */ + MD_RECOVERY_FROZEN, + /* waiting for pers->start() to finish */ + MD_RECOVERY_WAIT, + /* interrupted because io-error */ + MD_RECOVERY_ERROR, + + /* flags determines sync action, see details in enum sync_action */ + + /* if just this flag is set, action is resync. */ + MD_RECOVERY_SYNC, + /* + * paired with MD_RECOVERY_SYNC, if MD_RECOVERY_CHECK is not set, + * action is repair, means user requested resync. + */ + MD_RECOVERY_REQUESTED, /* - * If neither SYNC or RESHAPE are set, then it is a recovery. + * paired with MD_RECOVERY_SYNC and MD_RECOVERY_REQUESTED, action is + * check. */ - MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ - MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ - MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ - MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ - MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ - MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ - MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ - MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ - MD_RECOVERY_RESHAPE, /* A reshape is happening */ - MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ - MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ - MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ - MD_RESYNCING_REMOTE, /* remote node is running resync thread */ + MD_RECOVERY_CHECK, + /* recovery, or need to try it */ + MD_RECOVERY_RECOVER, + /* reshape */ + MD_RECOVERY_RESHAPE, + /* remote node is running resync thread */ + MD_RESYNCING_REMOTE, + /* raid456 lazy initial recover */ + MD_RECOVERY_LAZY_RECOVER, +}; + +enum md_ro_state { + MD_RDWR, + MD_RDONLY, + MD_AUTO_READ, + MD_MAX_STATE }; +static inline bool md_is_rdwr(struct mddev *mddev) +{ + return (mddev->ro == MD_RDWR); +} + +static inline bool reshape_interrupted(struct mddev *mddev) +{ + /* reshape never start */ + if (mddev->reshape_position == MaxSector) + return false; + + /* interrupted */ + if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + return true; + + /* running reshape will be interrupted soon. */ + if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) || + test_bit(MD_RECOVERY_INTR, &mddev->recovery) || + test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) + return true; + + return false; +} + static inline int __must_check mddev_lock(struct mddev *mddev) { - return mutex_lock_interruptible(&mddev->reconfig_mutex); + int ret; + + ret = mutex_lock_interruptible(&mddev->reconfig_mutex); + + /* MD_DELETED is set in do_md_stop with reconfig_mutex. + * So check it here. + */ + if (!ret && test_bit(MD_DELETED, &mddev->flags)) { + ret = -ENODEV; + mutex_unlock(&mddev->reconfig_mutex); + } + + return ret; } /* Sometimes we need to take the lock in a situation where * failure due to interrupts is not acceptable. + * It doesn't need to check MD_DELETED here, the owner which + * holds the lock here can't be stopped. And all paths can't + * call this function after do_md_stop. */ static inline void mddev_lock_nointr(struct mddev *mddev) { @@ -514,27 +734,22 @@ static inline void mddev_lock_nointr(struct mddev *mddev) static inline int mddev_trylock(struct mddev *mddev) { - return mutex_trylock(&mddev->reconfig_mutex); -} -extern void mddev_unlock(struct mddev *mddev); - -static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) -{ - atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); -} + int ret; -static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) -{ - atomic_add(nr_sectors, &bio->bi_disk->sync_io); + ret = mutex_trylock(&mddev->reconfig_mutex); + if (!ret && test_bit(MD_DELETED, &mddev->flags)) { + ret = -ENODEV; + mutex_unlock(&mddev->reconfig_mutex); + } + return ret; } +extern void mddev_unlock(struct mddev *mddev); struct md_personality { - char *name; - int level; - struct list_head list; - struct module *owner; - bool (*make_request)(struct mddev *mddev, struct bio *bio); + struct md_submodule_head head; + + bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); /* * start up works that do NOT require md_thread. tasks that * requires md_thread should go into start() @@ -551,13 +766,15 @@ struct md_personality int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); int (*spare_active) (struct mddev *mddev); - sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); + sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, + sector_t max_sector, int *skipped); int (*resize) (struct mddev *mddev, sector_t sectors); sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); int (*check_reshape) (struct mddev *mddev); int (*start_reshape) (struct mddev *mddev); void (*finish_reshape) (struct mddev *mddev); void (*update_reshape_pos) (struct mddev *mddev); + void (*prepare_suspend) (struct mddev *mddev); /* quiesce suspends or resumes internal processing. * 1 - stop new actions and wait for action io to complete * 0 - return to normal behaviour @@ -573,11 +790,11 @@ struct md_personality * array. */ void *(*takeover) (struct mddev *mddev); - /* congested implements bdi.congested_fn(). - * Will not be called while array is 'suspended' */ - int (*congested)(struct mddev *mddev, int bits); /* Changes the consistency policy of an active array. */ int (*change_consistency_policy)(struct mddev *mddev, const char *buf); + /* convert io ranges from array to bitmap */ + void (*bitmap_sector)(struct mddev *mddev, sector_t *offset, + unsigned long *sectors); }; struct md_sysfs_entry { @@ -585,7 +802,6 @@ struct md_sysfs_entry { ssize_t (*show)(struct mddev *, char *); ssize_t (*store)(struct mddev *, const char *, size_t); }; -extern struct attribute_group md_bitmap_group; static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) { @@ -656,55 +872,75 @@ struct md_thread { void *private; }; +struct md_io_clone { + struct mddev *mddev; + struct bio *orig_bio; + unsigned long start_time; + sector_t offset; + unsigned long sectors; + enum stat_group rw; + struct bio bio_clone; +}; + #define THREAD_WAKEUP 0 +#define md_wakeup_thread(thread) do { \ + rcu_read_lock(); \ + __md_wakeup_thread(thread); \ + rcu_read_unlock(); \ +} while (0) + static inline void safe_put_page(struct page *p) { if (p) put_page(p); } -extern int register_md_personality(struct md_personality *p); -extern int unregister_md_personality(struct md_personality *p); -extern int register_md_cluster_operations(struct md_cluster_operations *ops, - struct module *module); -extern int unregister_md_cluster_operations(void); -extern int md_setup_cluster(struct mddev *mddev, int nodes); -extern void md_cluster_stop(struct mddev *mddev); +int register_md_submodule(struct md_submodule_head *msh); +void unregister_md_submodule(struct md_submodule_head *msh); + extern struct md_thread *md_register_thread( void (*run)(struct md_thread *thread), struct mddev *mddev, const char *name); -extern void md_unregister_thread(struct md_thread **threadp); -extern void md_wakeup_thread(struct md_thread *thread); +extern void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp); +extern void __md_wakeup_thread(struct md_thread __rcu *thread); extern void md_check_recovery(struct mddev *mddev); extern void md_reap_sync_thread(struct mddev *mddev); -extern int mddev_init_writes_pending(struct mddev *mddev); -extern bool md_write_start(struct mddev *mddev, struct bio *bi); +extern enum sync_action md_sync_action(struct mddev *mddev); +extern enum sync_action md_sync_action_by_name(const char *page); +extern const char *md_sync_action_name(enum sync_action action); +extern void md_write_start(struct mddev *mddev, struct bio *bi); extern void md_write_inc(struct mddev *mddev, struct bio *bi); extern void md_write_end(struct mddev *mddev); extern void md_done_sync(struct mddev *mddev, int blocks, int ok); extern void md_error(struct mddev *mddev, struct md_rdev *rdev); extern void md_finish_reshape(struct mddev *mddev); - -extern int mddev_congested(struct mddev *mddev, int bits); -extern void md_flush_request(struct mddev *mddev, struct bio *bio); -extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, - sector_t sector, int size, struct page *page); +void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, + struct bio *bio, sector_t start, sector_t size); +void md_account_bio(struct mddev *mddev, struct bio **bio); +void md_free_cloned_bio(struct bio *bio); + +extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); +void md_write_metadata(struct mddev *mddev, struct md_rdev *rdev, + sector_t sector, int size, struct page *page, + unsigned int offset); extern int md_super_wait(struct mddev *mddev); extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, - struct page *page, int op, int op_flags, - bool metadata_op); + struct page *page, blk_opf_t opf, bool metadata_op); extern void md_do_sync(struct md_thread *thread); -extern void md_new_event(struct mddev *mddev); +extern void md_new_event(void); extern void md_allow_write(struct mddev *mddev); extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); extern int md_check_no_bitmap(struct mddev *mddev); extern int md_integrity_register(struct mddev *mddev); -extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); -extern void mddev_init(struct mddev *mddev); +extern int mddev_init(struct mddev *mddev); +extern void mddev_destroy(struct mddev *mddev); +void md_init_stacking_limits(struct queue_limits *lim); +struct mddev *md_alloc(dev_t dev, char *name); +void mddev_put(struct mddev *mddev); extern int md_run(struct mddev *mddev); extern int md_start(struct mddev *mddev); extern void md_stop(struct mddev *mddev); @@ -712,18 +948,25 @@ extern void md_stop_writes(struct mddev *mddev); extern int md_rdev_init(struct md_rdev *rdev); extern void md_rdev_clear(struct md_rdev *rdev); -extern void md_handle_request(struct mddev *mddev, struct bio *bio); -extern void mddev_suspend(struct mddev *mddev); +extern bool md_handle_request(struct mddev *mddev, struct bio *bio); +extern int mddev_suspend(struct mddev *mddev, bool interruptible); extern void mddev_resume(struct mddev *mddev); -extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, - struct mddev *mddev); +extern void md_idle_sync_thread(struct mddev *mddev); +extern void md_frozen_sync_thread(struct mddev *mddev); +extern void md_unfrozen_sync_thread(struct mddev *mddev); -extern void md_reload_sb(struct mddev *mddev, int raid_disk); extern void md_update_sb(struct mddev *mddev, int force); -extern void md_kick_rdev_from_array(struct md_rdev * rdev); +extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev); +extern void mddev_destroy_serial_pool(struct mddev *mddev, + struct md_rdev *rdev); struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); +static inline bool is_rdev_broken(struct md_rdev *rdev) +{ + return !disk_live(rdev->bdev->bd_disk); +} + static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) { int faulty = test_bit(Faulty, &rdev->flags); @@ -733,7 +976,6 @@ static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) } } -extern struct md_cluster_operations *md_cluster_ops; static inline int mddev_is_clustered(struct mddev *mddev) { return mddev->cluster_info && mddev->bitmap_info.nodes > 1; @@ -746,17 +988,105 @@ static inline void mddev_clear_unsupported_flags(struct mddev *mddev, mddev->flags &= ~unsupported_flags; } -static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) +static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) { - if (bio_op(bio) == REQ_OP_WRITE_SAME && - !bio->bi_disk->queue->limits.max_write_same_sectors) - mddev->queue->limits.max_write_same_sectors = 0; + if (bio_op(bio) == REQ_OP_WRITE_ZEROES && + !bio->bi_bdev->bd_disk->queue->limits.max_write_zeroes_sectors) + mddev->gendisk->queue->limits.max_write_zeroes_sectors = 0; } -static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) +static inline int mddev_suspend_and_lock(struct mddev *mddev) { - if (bio_op(bio) == REQ_OP_WRITE_ZEROES && - !bio->bi_disk->queue->limits.max_write_zeroes_sectors) - mddev->queue->limits.max_write_zeroes_sectors = 0; + int ret; + + ret = mddev_suspend(mddev, true); + if (ret) + return ret; + + ret = mddev_lock(mddev); + if (ret) + mddev_resume(mddev); + + return ret; +} + +static inline void mddev_suspend_and_lock_nointr(struct mddev *mddev) +{ + mddev_suspend(mddev, false); + mutex_lock(&mddev->reconfig_mutex); +} + +static inline void mddev_unlock_and_resume(struct mddev *mddev) +{ + mddev_unlock(mddev); + mddev_resume(mddev); +} + +struct mdu_array_info_s; +struct mdu_disk_info_s; + +extern int mdp_major; +void md_autostart_arrays(int part); +int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info); +int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info); +int do_md_run(struct mddev *mddev); +#define MDDEV_STACK_INTEGRITY (1u << 0) +int mddev_stack_rdev_limits(struct mddev *mddev, struct queue_limits *lim, + unsigned int flags); +int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev); +void mddev_update_io_opt(struct mddev *mddev, unsigned int nr_stripes); + +extern const struct block_device_operations md_fops; + +/* + * MD devices can be used undeneath by DM, in which case ->gendisk is NULL. + */ +static inline bool mddev_is_dm(struct mddev *mddev) +{ + return !mddev->gendisk; +} + +static inline bool raid_is_456(struct mddev *mddev) +{ + return mddev->level == ID_RAID4 || mddev->level == ID_RAID5 || + mddev->level == ID_RAID6; +} + +static inline void mddev_trace_remap(struct mddev *mddev, struct bio *bio, + sector_t sector) +{ + if (!mddev_is_dm(mddev)) + trace_block_bio_remap(bio, disk_devt(mddev->gendisk), sector); +} + +static inline bool rdev_blocked(struct md_rdev *rdev) +{ + /* + * Blocked will be set by error handler and cleared by daemon after + * updating superblock, meanwhile write IO should be blocked to prevent + * reading old data after power failure. + */ + if (test_bit(Blocked, &rdev->flags)) + return true; + + /* + * Faulty device should not be accessed anymore, there is no need to + * wait for bad block to be acknowledged. + */ + if (test_bit(Faulty, &rdev->flags)) + return false; + + /* rdev is blocked by badblocks. */ + if (test_bit(BlockedBadBlocks, &rdev->flags)) + return true; + + return false; } + +#define mddev_add_trace_msg(mddev, fmt, args...) \ +do { \ + if (!mddev_is_dm(mddev)) \ + blk_add_trace_msg((mddev)->gendisk->queue, fmt, ##args); \ +} while (0) + #endif /* _MD_MD_H */ |