From: NeilBrown Date: Sat, 16 Jun 2007 17:16:06 +0000 (-0700) Subject: md: fix two raid10 bugs X-Git-Tag: v2.6.22-rc5~11 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=af03b8e4e81c3789e597632268940edd11ffe870;p=linux-2.6-omap-h63xx.git 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 Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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);