diff options
| -rw-r--r-- | drivers/md/raid5.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index bb28fd6b44fe..020143dec180 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5788,6 +5788,18 @@ static void *raid5_takeover(mddev_t *mddev) return ERR_PTR(-EINVAL); } +static void *raid4_takeover(mddev_t *mddev) +{ + /* raid4 can take over raid5 if layout is right. + */ + if (mddev->level == 5 && + mddev->layout == ALGORITHM_PARITY_N) { + mddev->new_layout = 0; + mddev->new_level = 4; + return setup_conf(mddev); + } + return ERR_PTR(-EINVAL); +} static struct mdk_personality raid5_personality; @@ -5903,6 +5915,7 @@ static struct mdk_personality raid4_personality = .start_reshape = raid5_start_reshape, .finish_reshape = raid5_finish_reshape, .quiesce = raid5_quiesce, + .takeover = raid4_takeover, }; static int __init raid5_init(void) |