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authorNeilBrown <neilb@suse.de>2008-02-06 01:39:52 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 10:41:18 -0800
commitc620727779f7cc8ea96efb71f0651a26349e59c1 (patch)
tree777abdad9c9ef10cb4df5c0efc736e6c64851ed8 /drivers/md/raid10.c
parentc303da6d713b87b7b3f999f5acce8ecc76ff1adb (diff)
md: allow a maximum extent to be set for resyncing
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>
Diffstat (limited to 'drivers/md/raid10.c')
-rw-r--r--drivers/md/raid10.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index ba125277c6c4..d6f12882424d 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1657,6 +1657,9 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
return (max_sector - sector_nr) + sectors_skipped;
}
+ if (max_sector > mddev->resync_max)
+ max_sector = mddev->resync_max; /* Don't do IO beyond here */
+
/* make sure whole request will fit in a chunk - if chunks
* are meaningful
*/