The write-behind attribute is part of bitmap, since bitmap can be added/removed dynamically with the followings. 1. mdadm --grow /dev/md0 --bitmap=none 2. mdadm --grow /dev/md0 --bitmap=internal --write-behind So we need to destroy wb_info_pool in md_bitmap_destroy, and create the pool before load bitmap. Reviewed-by: NeilBrown <neilb@xxxxxxxx> Signed-off-by: Guoqing Jiang <gqjiang@xxxxxxxx> --- drivers/md/md-bitmap.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index e3403092c238..a6e260010682 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -1789,6 +1789,8 @@ void md_bitmap_destroy(struct mddev *mddev) return; md_bitmap_wait_behind_writes(mddev); + mempool_destroy(mddev->wb_info_pool); + mddev->wb_info_pool = NULL; mutex_lock(&mddev->bitmap_info.mutex); spin_lock(&mddev->lock); @@ -1899,10 +1901,14 @@ int md_bitmap_load(struct mddev *mddev) sector_t start = 0; sector_t sector = 0; struct bitmap *bitmap = mddev->bitmap; + struct md_rdev *rdev; if (!bitmap) goto out; + rdev_for_each(rdev, mddev) + mddev_create_wb_pool(mddev, rdev, true); + if (mddev_is_clustered(mddev)) md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes); -- 2.12.3
