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On a read-error we suspend the array, then synchronously read the block from other arrays until we find one where we can read it. Then we try writing the good data back everywhere and make sure it works. If any write or subsequent read fails, only then do we fail the device out of the array. To be able to suspend the array, we need to also keep track of how many requests are queued for handling by raid1d. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
#ifndef _RAID1_H
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#define _RAID1_H
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#include <linux/raid/md.h>
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typedef struct mirror_info mirror_info_t;
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struct mirror_info {
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mdk_rdev_t *rdev;
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sector_t head_position;
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};
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/*
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* memory pools need a pointer to the mddev, so they can force an unplug
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* when memory is tight, and a count of the number of drives that the
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* pool was allocated for, so they know how much to allocate and free.
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* mddev->raid_disks cannot be used, as it can change while a pool is active
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* These two datums are stored in a kmalloced struct.
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*/
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struct pool_info {
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mddev_t *mddev;
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int raid_disks;
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};
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typedef struct r1bio_s r1bio_t;
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struct r1_private_data_s {
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mddev_t *mddev;
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mirror_info_t *mirrors;
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int raid_disks;
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int working_disks;
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int last_used;
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sector_t next_seq_sect;
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spinlock_t device_lock;
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struct list_head retry_list;
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/* queue pending writes and submit them on unplug */
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struct bio_list pending_bio_list;
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/* queue of writes that have been unplugged */
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struct bio_list flushing_bio_list;
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/* for use when syncing mirrors: */
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spinlock_t resync_lock;
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int nr_pending;
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int nr_waiting;
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int nr_queued;
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int barrier;
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sector_t next_resync;
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int fullsync; /* set to 1 if a full sync is needed,
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* (fresh device added).
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* Cleared when a sync completes.
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*/
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wait_queue_head_t wait_barrier;
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struct pool_info *poolinfo;
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struct page *tmppage;
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mempool_t *r1bio_pool;
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mempool_t *r1buf_pool;
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};
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typedef struct r1_private_data_s conf_t;
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/*
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* this is the only point in the RAID code where we violate
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* C type safety. mddev->private is an 'opaque' pointer.
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*/
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#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
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/*
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* this is our 'private' RAID1 bio.
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*
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* it contains information about what kind of IO operations were started
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* for this RAID1 operation, and about their status:
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*/
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struct r1bio_s {
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atomic_t remaining; /* 'have we finished' count,
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* used from IRQ handlers
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*/
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atomic_t behind_remaining; /* number of write-behind ios remaining
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* in this BehindIO request
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*/
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sector_t sector;
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int sectors;
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unsigned long state;
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mddev_t *mddev;
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/*
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* original bio going to /dev/mdx
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*/
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struct bio *master_bio;
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/*
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* if the IO is in READ direction, then this is where we read
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*/
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int read_disk;
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struct list_head retry_list;
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struct bitmap_update *bitmap_update;
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/*
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* if the IO is in WRITE direction, then multiple bios are used.
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* We choose the number when they are allocated.
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*/
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struct bio *bios[0];
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/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
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};
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/* bits for r1bio.state */
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#define R1BIO_Uptodate 0
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#define R1BIO_IsSync 1
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#define R1BIO_Degraded 2
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#define R1BIO_BehindIO 3
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#define R1BIO_Barrier 4
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#define R1BIO_BarrierRetry 5
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/* For write-behind requests, we call bi_end_io when
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* the last non-write-behind device completes, providing
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* any write was successful. Otherwise we call when
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* any write-behind write succeeds, otherwise we call
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* with failure when last write completes (and all failed).
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* Record that bi_end_io was called with this flag...
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*/
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#define R1BIO_Returned 4
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#endif
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