[PATCH] md: optimise reconstruction when re-adding a recently failed drive.
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>
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 16e94a9..6cdcb44 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -183,6 +183,10 @@
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