Commit e321f8a8 authored by Liu Bo's avatar Liu Bo Committed by David Sterba

Btrfs: use down_read_nested to make lockdep silent

If @block_group is not @used_bg, it'll try to get @used_bg's lock without
droping @block_group 's lock and lockdep has throwed a scary deadlock warning
about it.
Fix it by using down_read_nested.
Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent d0280996
...@@ -7387,7 +7387,8 @@ btrfs_lock_cluster(struct btrfs_block_group_cache *block_group, ...@@ -7387,7 +7387,8 @@ btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
spin_unlock(&cluster->refill_lock); spin_unlock(&cluster->refill_lock);
down_read(&used_bg->data_rwsem); /* We should only have one-level nested. */
down_read_nested(&used_bg->data_rwsem, SINGLE_DEPTH_NESTING);
spin_lock(&cluster->refill_lock); spin_lock(&cluster->refill_lock);
if (used_bg == cluster->block_group) if (used_bg == cluster->block_group)
......
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