tree 1ca8157e11033989ee94c20b1f2d4c936f9dc09c
parent 6cce3b23f6f8e974c00af7a9b88f1d413ba368a8
author NeilBrown <neilb@suse.de> 1136535617 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136565243 -0800

[PATCH] md: fix raid6 resync check/repair code

raid6 currently does not check the P/Q syndromes when doing a resync, it just
calculates the correct value and writes it.  Doing the check can reduce writes
(often to 0) for a resync, and it is needed to properly implement the

  echo check > sync_action

operation.

This patch implements the appropriate checks and tidies up some related code.

It also allows raid6 user-requested resync to bypass the intent bitmap.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>