On Mon, Jul 15, 2013 at 7:43 PM, Josef Bacik <jba...@fusionio.com> wrote:
> We aren't setting path->locks[level] when we resume a snapshot deletion which
> means we won't unlock the buffer when we free the path. This causes deadlocks
> if we happen to re-allocate the block before we've evicted the extent buffer
> from cache. Thanks,
>
> Reported-by: Alex Lyakas <alex.bt...@zadarastorage.com>
> Signed-off-by: Josef Bacik <jba...@fusionio.com>
> ---
> fs/btrfs/extent-tree.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 8c204e1..997a5dd 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -7555,6 +7555,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
> while (1) {
> btrfs_tree_lock(path->nodes[level]);
> btrfs_set_lock_blocking(path->nodes[level]);
> + path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
>
> ret = btrfs_lookup_extent_info(trans, root,
> path->nodes[level]->start,
> @@ -7570,6 +7571,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
> break;
>
> btrfs_tree_unlock(path->nodes[level]);
> + path->locks[level] = 0;
> WARN_ON(wc->refs[level] != 1);
> level--;
> }
> --
> 1.7.7.6
>
> --
Tested-by: Liran Strugano <li...@zadarastorage.com>
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