c4a3955145
MD: Remember the last sync operation that was performed This patch adds a field to the mddev structure to track the last sync operation that was performed. This is especially useful when it comes to what is recorded in mismatch_cnt in sysfs. If the last operation was "data-check", then it reports the number of descrepancies found by the user-initiated check. If it was a "repair" operation, then it is reporting the number of descrepancies repaired. etc. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
624 lines
21 KiB
C
624 lines
21 KiB
C
/*
|
|
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/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>
|
|
|
|
#define MaxSector (~(sector_t)0)
|
|
|
|
/* Bad block numbers are stored sorted in a single page.
|
|
* 64bits is used for each block or extent.
|
|
* 54 bits are sector number, 9 bits are extent size,
|
|
* 1 bit is an 'acknowledged' flag.
|
|
*/
|
|
#define MD_MAX_BADBLOCKS (PAGE_SIZE/8)
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
sector_t recovery_offset;/* If this device has been partially
|
|
* recovered, this is where we were
|
|
* up to.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
struct timespec 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 sysfs_dirent *sysfs_state; /* handle for 'state'
|
|
* sysfs entry */
|
|
|
|
struct badblocks {
|
|
int count; /* count of bad blocks */
|
|
int unacked_exist; /* there probably are unacknowledged
|
|
* bad blocks. This is only cleared
|
|
* when a read discovers none
|
|
*/
|
|
int shift; /* shift from sectors to block size
|
|
* a -ve shift means badblocks are
|
|
* disabled.*/
|
|
u64 *page; /* badblock list */
|
|
int changed;
|
|
seqlock_t lock;
|
|
|
|
sector_t sector;
|
|
sector_t size; /* in sectors */
|
|
} badblocks;
|
|
};
|
|
enum flag_bits {
|
|
Faulty, /* device is known to have a fault */
|
|
In_sync, /* device is in_sync with rest of array */
|
|
Unmerged, /* device is being added to array and should
|
|
* be considerred for bvec_merge_fn but not
|
|
* yet for actual IO
|
|
*/
|
|
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.
|
|
*/
|
|
};
|
|
|
|
#define BB_LEN_MASK (0x00000000000001FFULL)
|
|
#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
|
|
#define BB_ACK_MASK (0x8000000000000000ULL)
|
|
#define BB_MAX_LEN 512
|
|
#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
|
|
#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
|
|
#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
|
|
#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
|
|
|
|
extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
|
|
sector_t *first_bad, int *bad_sectors);
|
|
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 = md_is_badblock(&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);
|
|
extern void md_ack_all_badblocks(struct badblocks *bb);
|
|
|
|
struct mddev {
|
|
void *private;
|
|
struct md_personality *pers;
|
|
dev_t unit;
|
|
int md_minor;
|
|
struct list_head disks;
|
|
unsigned long flags;
|
|
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
|
|
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
|
|
#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
|
|
#define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */
|
|
|
|
int suspended;
|
|
atomic_t active_io;
|
|
int ro;
|
|
int sysfs_active; /* set when sysfs deletes
|
|
* are happening, so run/
|
|
* takeover/stop are not safe
|
|
*/
|
|
int ready; /* See when safe to pass
|
|
* IO requests down */
|
|
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;
|
|
time_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;
|
|
/* recovery/resync flags
|
|
* NEEDED: we might need to start a resync/recover
|
|
* RUNNING: a thread is running, or about to be started
|
|
* SYNC: actually doing a resync, not a recovery
|
|
* RECOVER: doing recovery, or need to try it.
|
|
* INTR: resync needs to be aborted for some reason
|
|
* DONE: thread is done and is waiting to be reaped
|
|
* REQUEST: user-space has requested a sync (used with SYNC)
|
|
* CHECK: user-space request for check-only, no repair
|
|
* RESHAPE: A reshape is happening
|
|
* ERROR: sync-action interrupted because io-error
|
|
*
|
|
* If neither SYNC or RESHAPE are set, then it is a recovery.
|
|
*/
|
|
#define MD_RECOVERY_RUNNING 0
|
|
#define MD_RECOVERY_SYNC 1
|
|
#define MD_RECOVERY_RECOVER 2
|
|
#define MD_RECOVERY_INTR 3
|
|
#define MD_RECOVERY_DONE 4
|
|
#define MD_RECOVERY_NEEDED 5
|
|
#define MD_RECOVERY_REQUESTED 6
|
|
#define MD_RECOVERY_CHECK 7
|
|
#define MD_RECOVERY_RESHAPE 8
|
|
#define MD_RECOVERY_FROZEN 9
|
|
#define MD_RECOVERY_ERROR 10
|
|
|
|
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
|
|
*/
|
|
int merge_check_needed; /* at least one
|
|
* member device
|
|
* has a
|
|
* merge_bvec_fn */
|
|
|
|
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 sysfs_dirent *sysfs_state; /* handle for 'array_state'
|
|
* file in sysfs.
|
|
*/
|
|
struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */
|
|
|
|
struct work_struct del_work; /* used for delayed sysfs removal */
|
|
|
|
spinlock_t write_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;
|
|
} 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_FLUSH 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);
|
|
};
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
int (*stop)(struct mddev *mddev);
|
|
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 go_faster);
|
|
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);
|
|
};
|
|
|
|
|
|
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 sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name)
|
|
{
|
|
if (sd)
|
|
return sysfs_get_dirent(sd, NULL, name);
|
|
return sd;
|
|
}
|
|
static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *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) && 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) && 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 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 void md_super_wait(struct mddev *mddev);
|
|
extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
|
|
struct page *page, int rw, 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 void 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 restore_bitmap_write_access(struct file *file);
|
|
|
|
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_clone_mddev(struct bio *bio, gfp_t gfp_mask,
|
|
struct mddev *mddev);
|
|
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
|
|
struct mddev *mddev);
|
|
extern void md_trim_bio(struct bio *bio, int offset, int size);
|
|
|
|
extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);
|
|
static inline int mddev_check_plugged(struct mddev *mddev)
|
|
{
|
|
return !!blk_check_plugged(md_unplug, mddev,
|
|
sizeof(struct blk_plug_cb));
|
|
}
|
|
#endif /* _MD_MD_H */
|