From: Nikolay Borisov nborisov@suse.com
[ Upstream commit 6c122e2a0c515cfb3f3a9cefb5dad4cb62109c78 ]
get_old_root used used only by btrfs_search_old_slot to initialise the path structure. The old root is always a cloned buffer (either via alloc dummy or via btrfs_clone_extent_buffer) and its reference count is 2: 1 from allocation, 1 from extent_buffer_get call in get_old_root.
This latter explicit ref count acquire operation is in fact unnecessary since the semantic is such that the newly allocated buffer is handed over to the btrfs_path for lifetime management. Considering this just remove the extra extent_buffer_get in get_old_root.
Signed-off-by: Nikolay Borisov nborisov@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/ctree.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index c9943d70e2cb..6c13d7d83f5c 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1421,7 +1421,6 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
if (!eb) return NULL; - extent_buffer_get(eb); btrfs_tree_read_lock(eb); if (old_root) { btrfs_set_header_bytenr(eb, eb->start);