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md: allow a maximum extent to be set for resyncing

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This allows userspace to control resync/reshape progress and synchronise it
with other activities, such as shared access in a SAN, or backing up critical
sections during a tricky reshape.

Writing a number of sectors (which must be a multiple of the chunk size if
such is meaningful) causes a resync to pause when it gets to that point.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2008-02-06 01:39:52 -08:00 • committed by Linus Torvalds
parent c303da6d71
commit c620727779
6 changed files with 107 additions and 10 deletions
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2
include/linux/raid/md_k.h
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@ -219,6 +219,8 @@ struct mddev_s
atomic_t recovery_active; /* blocks scheduled, but not written */
wait_queue_head_t recovery_wait;
sector_t recovery_cp;
sector_t resync_max; /* resync should pause
* when it gets here */
spinlock_t write_lock;
wait_queue_head_t sb_wait; /* for waiting on superblock updates */