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[PATCH] md: optimise reconstruction when re-adding a recently failed drive.

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When an array is degraded, bit in the intent-bitmap are never cleared.  So if
a recently failed drive is re-added, we only need to reconstruct the block
that are still reflected in the bitmap.

This patch adds support for this re-adding.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-21 17:17:25 -07:00 • committed by Linus Torvalds
parent 289e99e8ed
commit 41158c7eb2
3 changed files with 65 additions and 17 deletions
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4
include/linux/raid/md_k.h
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@ -183,6 +183,10 @@ struct mdk_rdev_s
int desc_nr; /* descriptor index in the superblock */
int raid_disk; /* role of device in array */
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
*/
atomic_t nr_pending; /* number of pending requests.
* only maintained for arrays that