| /* |
| 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 |
| #define _MD_MD_H |
| |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/badblocks.h> |
| #include <linux/kobject.h> |
| #include <linux/list.h> |
| #include <linux/mm.h> |
| #include <linux/mutex.h> |
| #include <linux/timer.h> |
| #include <linux/wait.h> |
| #include <linux/workqueue.h> |
| #include "md-cluster.h" |
| |
| #define MaxSector (~(sector_t)0) |
| |
| /* |
| * These flags should really be called "NO_RETRY" rather than |
| * "FAILFAST" because they don't make any promise about time lapse, |
| * only about the number of retries, which will be zero. |
| * REQ_FAILFAST_DRIVER is not included because |
| * Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.") |
| * seems to suggest that the errors it avoids retrying should usually |
| * be retried. |
| */ |
| #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) |
| /* |
| * MD's 'extended' device |
| */ |
| struct md_rdev { |
| struct list_head same_set; /* RAID devices within the same set */ |
| |
| sector_t sectors; /* Device size (in 512bytes sectors) */ |
| struct mddev *mddev; /* RAID array if running */ |
| int last_events; /* IO event timestamp */ |
| |
| /* |
| * If meta_bdev is non-NULL, it means that a separate device is |
| * being used to store the metadata (superblock/bitmap) which |
| * would otherwise be contained on the same device as the data (bdev). |
| */ |
| struct block_device *meta_bdev; |
| struct block_device *bdev; /* block device handle */ |
| |
| struct page *sb_page, *bb_page; |
| int sb_loaded; |
| __u64 sb_events; |
| sector_t data_offset; /* start of data in array */ |
| sector_t new_data_offset;/* only relevant while reshaping */ |
| sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
| int sb_size; /* bytes in the superblock */ |
| int preferred_minor; /* autorun support */ |
| |
| struct kobject kobj; |
| |
| /* A device can be in one of three states based on two flags: |
| * Not working: faulty==1 in_sync==0 |
| * Fully working: faulty==0 in_sync==1 |
| * Working, but not |
| * in sync with array |
| * faulty==0 in_sync==0 |
| * |
| * It can never have faulty==1, in_sync==1 |
| * This reduces the burden of testing multiple flags in many cases |
| */ |
| |
| unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
| wait_queue_head_t blocked_wait; |
| |
| int desc_nr; /* descriptor index in the superblock */ |
| int raid_disk; /* role of device in array */ |
| int new_raid_disk; /* role that the device will have in |
| * the array after a level-change completes. |
| */ |
| int saved_raid_disk; /* role that device used to have in the |
| * array and could again if we did a partial |
| * resync from the bitmap |
| */ |
| union { |
| sector_t recovery_offset;/* If this device has been partially |
| * recovered, this is where we were |
| * up to. |
| */ |
| sector_t journal_tail; /* If this device is a journal device, |
| * this is the journal tail (journal |
| * recovery start point) |
| */ |
| }; |
| |
| atomic_t nr_pending; /* number of pending requests. |
| * only maintained for arrays that |
| * support hot removal |
| */ |
| atomic_t read_errors; /* number of consecutive read errors that |
| * we have tried to ignore. |
| */ |
| time64_t last_read_error; /* monotonic time since our |
| * last read error |
| */ |
| atomic_t corrected_errors; /* number of corrected read errors, |
| * for reporting to userspace and storing |
| * in superblock. |
| */ |
| struct work_struct del_work; /* used for delayed sysfs removal */ |
| |
| struct kernfs_node *sysfs_state; /* handle for 'state' |
| * sysfs entry */ |
| |
| struct badblocks badblocks; |
| |
| struct { |
| short offset; /* Offset from superblock to start of PPL. |
| * Not used by external metadata. */ |
| unsigned int size; /* Size in sectors of the PPL space */ |
| sector_t sector; /* First sector of the PPL space */ |
| } ppl; |
| }; |
| enum flag_bits { |
| Faulty, /* device is known to have a fault */ |
| In_sync, /* device is in_sync with rest of array */ |
| Bitmap_sync, /* ..actually, not quite In_sync. Need a |
| * bitmap-based recovery to get fully in sync |
| */ |
| WriteMostly, /* Avoid reading if at all possible */ |
| AutoDetected, /* added by auto-detect */ |
| Blocked, /* An error occurred but has not yet |
| * been acknowledged by the metadata |
| * handler, so don't allow writes |
| * until it is cleared */ |
| WriteErrorSeen, /* A write error has been seen on this |
| * device |
| */ |
| FaultRecorded, /* Intermediate state for clearing |
| * Blocked. The Fault is/will-be |
| * recorded in the metadata, but that |
| * metadata hasn't been stored safely |
| * on disk yet. |
| */ |
| BlockedBadBlocks, /* A writer is blocked because they |
| * found an unacknowledged bad-block. |
| * This can safely be cleared at any |
| * time, and the writer will re-check. |
| * It may be set at any time, and at |
| * worst the writer will timeout and |
| * re-check. So setting it as |
| * accurately as possible is good, but |
| * not absolutely critical. |
| */ |
| WantReplacement, /* This device is a candidate to be |
| * hot-replaced, either because it has |
| * reported some faults, or because |
| * of explicit request. |
| */ |
| Replacement, /* This device is a replacement for |
| * a want_replacement device with same |
| * raid_disk number. |
| */ |
| Candidate, /* For clustered environments only: |
| * This device is seen locally but not |
| * by the whole cluster |
| */ |
| Journal, /* This device is used as journal for |
| * raid-5/6. |
| * Usually, this device should be faster |
| * 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 |
| */ |
| FailFast, /* Minimal retries should be attempted on |
| * this device, so use REQ_FAILFAST_DEV. |
| * Also don't try to repair failed reads. |
| * It is expects that no bad block log |
| * is present. |
| */ |
| LastDev, /* Seems to be the last working dev as |
| * it didn't fail, so don't use FailFast |
| * any more for metadata |
| */ |
| }; |
| |
| static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
| sector_t *first_bad, int *bad_sectors) |
| { |
| if (unlikely(rdev->badblocks.count)) { |
| int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, |
| sectors, |
| first_bad, bad_sectors); |
| if (rv) |
| *first_bad -= rdev->data_offset; |
| return rv; |
| } |
| 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 */ |
| 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 */ |
| }; |
| |
| enum mddev_sb_flags { |
| MD_SB_CHANGE_DEVS, /* Some device status has changed */ |
| MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ |
| MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ |
| MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ |
| }; |
| |
| struct mddev { |
| void *private; |
| struct md_personality *pers; |
| dev_t unit; |
| int md_minor; |
| struct list_head disks; |
| unsigned long flags; |
| unsigned long sb_flags; |
| |
| int suspended; |
| atomic_t active_io; |
| int ro; |
| int sysfs_active; /* set when sysfs deletes |
| * are happening, so run/ |
| * takeover/stop are not safe |
| */ |
| struct gendisk *gendisk; |
| |
| struct kobject kobj; |
| int hold_active; |
| #define UNTIL_IOCTL 1 |
| #define UNTIL_STOP 2 |
| |
| /* Superblock information */ |
| int major_version, |
| minor_version, |
| patch_version; |
| int persistent; |
| int external; /* metadata is |
| * managed externally */ |
| char metadata_type[17]; /* externally set*/ |
| int chunk_sectors; |
| time64_t ctime, utime; |
| int level, layout; |
| char clevel[16]; |
| int raid_disks; |
| int max_disks; |
| sector_t dev_sectors; /* used size of |
| * component devices */ |
| sector_t array_sectors; /* exported array size */ |
| int external_size; /* size managed |
| * externally */ |
| __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 |
| * to just decrement the event count on a dirty->clean transition. |
| * So we record that possibility here. |
| */ |
| int can_decrease_events; |
| |
| char uuid[16]; |
| |
| /* If the array is being reshaped, we need to record the |
| * new shape and an indication of where we are up to. |
| * This is written to the superblock. |
| * If reshape_position is MaxSector, then no reshape is happening (yet). |
| */ |
| sector_t reshape_position; |
| int delta_disks, new_level, new_layout; |
| int new_chunk_sectors; |
| int reshape_backwards; |
| |
| struct md_thread *thread; /* management thread */ |
| struct md_thread *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 |
| * when the sync thread is "frozen" (interrupted) or "idle" (stopped |
| * or finished). It is overwritten when a new sync operation is begun. |
| */ |
| char *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 |
| * everything completes, then set curr_resync_completed to curr_resync. |
| * As such it may be well behind the real resync mark, but it is a value |
| * we are certain of. |
| */ |
| sector_t curr_resync_completed; |
| unsigned long resync_mark; /* a recent timestamp */ |
| sector_t resync_mark_cnt;/* blocks written at resync_mark */ |
| sector_t curr_mark_cnt; /* blocks scheduled now */ |
| |
| sector_t resync_max_sectors; /* may be set by personality */ |
| |
| atomic64_t resync_mismatches; /* count of sectors where |
| * parity/replica mismatch found |
| */ |
| |
| /* allow user-space to request suspension of IO to regions of the array */ |
| sector_t suspend_lo; |
| sector_t suspend_hi; |
| /* if zero, use the system-wide default */ |
| int sync_speed_min; |
| int sync_speed_max; |
| |
| /* resync even though the same disks are shared among md-devices */ |
| int parallel_resync; |
| |
| int ok_start_degraded; |
| |
| unsigned long recovery; |
| /* If a RAID personality determines that recovery (of a particular |
| * device) will fail due to a read error on the source device, it |
| * takes a copy of this number and does not attempt recovery again |
| * until this number changes. |
| */ |
| int recovery_disabled; |
| |
| int in_sync; /* know to not need resync */ |
| /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
| * 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. |
| * Lock ordering is: |
| * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk |
| * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open |
| */ |
| struct mutex open_mutex; |
| struct mutex reconfig_mutex; |
| atomic_t active; /* general refcount */ |
| atomic_t openers; /* number of active opens */ |
| |
| int changed; /* True if we might need to |
| * reread partition info */ |
| int degraded; /* whether md should consider |
| * adding a spare |
| */ |
| |
| atomic_t recovery_active; /* blocks scheduled, but not written */ |
| wait_queue_head_t recovery_wait; |
| sector_t recovery_cp; |
| sector_t resync_min; /* user requested sync |
| * starts here */ |
| sector_t resync_max; /* resync should pause |
| * when it gets here */ |
| |
| struct kernfs_node *sysfs_state; /* handle for 'array_state' |
| * file in sysfs. |
| */ |
| struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ |
| |
| struct work_struct del_work; /* used for delayed sysfs removal */ |
| |
| /* "lock" protects: |
| * flush_bio transition from NULL to !NULL |
| * rdev superblocks, events |
| * clearing MD_CHANGE_* |
| * in_sync - and related safemode and MD_CHANGE changes |
| * pers (also protected by reconfig_mutex and pending IO). |
| * clearing ->bitmap |
| * clearing ->bitmap_info.file |
| * changing ->resync_{min,max} |
| * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) |
| */ |
| spinlock_t lock; |
| wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
| atomic_t pending_writes; /* number of active superblock writes */ |
| |
| unsigned int safemode; /* if set, update "clean" superblock |
| * when no writes pending. |
| */ |
| unsigned int safemode_delay; |
| struct timer_list safemode_timer; |
| atomic_t writes_pending; |
| struct request_queue *queue; /* for plugging ... */ |
| |
| struct bitmap *bitmap; /* the bitmap for the device */ |
| struct { |
| struct file *file; /* the bitmap file */ |
| loff_t offset; /* offset from superblock of |
| * start of bitmap. May be |
| * negative, but not '0' |
| * For external metadata, offset |
| * from start of device. |
| */ |
| unsigned long space; /* space available at this offset */ |
| loff_t default_offset; /* this is the offset to use when |
| * hot-adding a bitmap. It should |
| * eventually be settable by sysfs. |
| */ |
| unsigned long default_space; /* space available at |
| * default offset */ |
| struct mutex mutex; |
| unsigned long chunksize; |
| unsigned long daemon_sleep; /* how many jiffies between updates? */ |
| unsigned long max_write_behind; /* write-behind mode */ |
| int external; |
| int nodes; /* Maximum number of nodes in the cluster */ |
| char cluster_name[64]; /* Name of the cluster */ |
| } bitmap_info; |
| |
| atomic_t max_corr_read_errors; /* max read retries */ |
| struct list_head all_mddevs; |
| |
| struct attribute_group *to_remove; |
| |
| struct bio_set *bio_set; |
| |
| /* Generic flush handling. |
| * The last to finish preflush schedules a worker to submit |
| * the rest of the request (without the REQ_PREFLUSH flag). |
| */ |
| struct bio *flush_bio; |
| atomic_t flush_pending; |
| struct work_struct flush_work; |
| struct work_struct event_work; /* used by dm to report failure event */ |
| void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
| struct md_cluster_info *cluster_info; |
| unsigned int good_device_nr; /* good device num within cluster raid */ |
| }; |
| |
| enum recovery_flags { |
| /* |
| * If neither SYNC or RESHAPE are set, then it is a recovery. |
| */ |
| 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 */ |
| }; |
| |
| static inline int __must_check mddev_lock(struct mddev *mddev) |
| { |
| return mutex_lock_interruptible(&mddev->reconfig_mutex); |
| } |
| |
| /* Sometimes we need to take the lock in a situation where |
| * failure due to interrupts is not acceptable. |
| */ |
| static inline void mddev_lock_nointr(struct mddev *mddev) |
| { |
| mutex_lock(&mddev->reconfig_mutex); |
| } |
| |
| static inline int mddev_is_locked(struct mddev *mddev) |
| { |
| return mutex_is_locked(&mddev->reconfig_mutex); |
| } |
| |
| 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); |
| } |
| |
| struct md_personality |
| { |
| char *name; |
| int level; |
| struct list_head list; |
| struct module *owner; |
| void (*make_request)(struct mddev *mddev, struct bio *bio); |
| int (*run)(struct mddev *mddev); |
| void (*free)(struct mddev *mddev, void *priv); |
| void (*status)(struct seq_file *seq, struct mddev *mddev); |
| /* error_handler must set ->faulty and clear ->in_sync |
| * if appropriate, and should abort recovery if needed |
| */ |
| void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
| 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); |
| 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); |
| /* quiesce moves between quiescence states |
| * 0 - fully active |
| * 1 - no new requests allowed |
| * others - reserved |
| */ |
| void (*quiesce) (struct mddev *mddev, int state); |
| /* takeover is used to transition an array from one |
| * personality to another. The new personality must be able |
| * to handle the data in the current layout. |
| * e.g. 2drive raid1 -> 2drive raid5 |
| * ndrive raid5 -> degraded n+1drive raid6 with special layout |
| * If the takeover succeeds, a new 'private' structure is returned. |
| * This needs to be installed and then ->run used to activate the |
| * 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); |
| }; |
| |
| struct md_sysfs_entry { |
| struct attribute attr; |
| 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) |
| { |
| if (sd) |
| return sysfs_get_dirent(sd, name); |
| return sd; |
| } |
| static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) |
| { |
| if (sd) |
| sysfs_notify_dirent(sd); |
| } |
| |
| static inline char * mdname (struct mddev * mddev) |
| { |
| return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; |
| } |
| |
| static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| char nm[20]; |
| if (!test_bit(Replacement, &rdev->flags) && |
| !test_bit(Journal, &rdev->flags) && |
| mddev->kobj.sd) { |
| sprintf(nm, "rd%d", rdev->raid_disk); |
| return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); |
| } else |
| return 0; |
| } |
| |
| static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| char nm[20]; |
| if (!test_bit(Replacement, &rdev->flags) && |
| !test_bit(Journal, &rdev->flags) && |
| mddev->kobj.sd) { |
| sprintf(nm, "rd%d", rdev->raid_disk); |
| sysfs_remove_link(&mddev->kobj, nm); |
| } |
| } |
| |
| /* |
| * iterates through some rdev ringlist. It's safe to remove the |
| * current 'rdev'. Dont touch 'tmp' though. |
| */ |
| #define rdev_for_each_list(rdev, tmp, head) \ |
| list_for_each_entry_safe(rdev, tmp, head, same_set) |
| |
| /* |
| * iterates through the 'same array disks' ringlist |
| */ |
| #define rdev_for_each(rdev, mddev) \ |
| list_for_each_entry(rdev, &((mddev)->disks), same_set) |
| |
| #define rdev_for_each_safe(rdev, tmp, mddev) \ |
| list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
| |
| #define rdev_for_each_rcu(rdev, mddev) \ |
| list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) |
| |
| struct md_thread { |
| void (*run) (struct md_thread *thread); |
| struct mddev *mddev; |
| wait_queue_head_t wqueue; |
| unsigned long flags; |
| struct task_struct *tsk; |
| unsigned long timeout; |
| void *private; |
| }; |
| |
| #define THREAD_WAKEUP 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); |
| 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_check_recovery(struct mddev *mddev); |
| extern void md_reap_sync_thread(struct mddev *mddev); |
| extern void md_write_start(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); |
| 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); |
| extern void md_do_sync(struct md_thread *thread); |
| extern void md_new_event(struct mddev *mddev); |
| extern int 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 md_run(struct mddev *mddev); |
| extern void md_stop(struct mddev *mddev); |
| 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 mddev_suspend(struct mddev *mddev); |
| 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_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); |
| struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); |
| |
| static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
| { |
| int faulty = test_bit(Faulty, &rdev->flags); |
| if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| } |
| } |
| |
| 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; |
| } |
| |
| /* clear unsupported mddev_flags */ |
| static inline void mddev_clear_unsupported_flags(struct mddev *mddev, |
| unsigned long unsupported_flags) |
| { |
| mddev->flags &= ~unsupported_flags; |
| } |
| |
| static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) |
| { |
| if (bio_op(bio) == REQ_OP_WRITE_SAME && |
| !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors) |
| mddev->queue->limits.max_write_same_sectors = 0; |
| } |
| #endif /* _MD_MD_H */ |