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md-bitmap: create and destroy wb_info_pool with the change of bitmap

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The write-behind attribute is part of bitmap, since bitmap
can be added/removed dynamically with the following.

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@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Guoqing Jiang 2019-06-14 17:10:38 +08:00 committed by Song Liu
parent 10c92fca63
commit 617b194a13
1 changed files with 6 additions and 0 deletions
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6
drivers/md/md-bitmap.c
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@ -1790,6 +1790,8 @@ 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);
@ -1900,10 +1902,14 @@ 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);