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authorNeilBrown <neilb@suse.de>2007-06-16 10:16:06 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-16 13:16:15 -0700
commitaf03b8e4e81c3789e597632268940edd11ffe870 (patch)
treebf161f88b6d9dbdd484366b9640b500617db5ab3
parentedad01e2a1c527af3baf22dc6977aeb058881150 (diff)
downloadlinux-af03b8e4e81c3789e597632268940edd11ffe870.tar.gz
md: fix two raid10 bugs
1/ When resyncing a degraded raid10 which has more than 2 copies of each block, garbage can get synced on top of good data. 2/ We round the wrong way in part of the device size calculation, which can cause confusion. Signed-off-by: Neil Brown <neilb@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/md/raid10.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 82249a69014..9eb66c1b523 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1867,6 +1867,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
int d = r10_bio->devs[i].devnum;
bio = r10_bio->devs[i].bio;
bio->bi_end_io = NULL;
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
if (conf->mirrors[d].rdev == NULL ||
test_bit(Faulty, &conf->mirrors[d].rdev->flags))
continue;
@@ -2037,6 +2038,11 @@ static int run(mddev_t *mddev)
/* 'size' is now the number of chunks in the array */
/* calculate "used chunks per device" in 'stride' */
stride = size * conf->copies;
+
+ /* We need to round up when dividing by raid_disks to
+ * get the stride size.
+ */
+ stride += conf->raid_disks - 1;
sector_div(stride, conf->raid_disks);
mddev->size = stride << (conf->chunk_shift-1);