| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 24/62] btrfs: Remove extraneous extent_buffer_get from tree_mod_log_rewind | Date | Fri, 11 Sep 2020 14:46:07 +0200 |
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From: Nikolay Borisov <nborisov@suse.com>
[ Upstream commit 24cee18a1c1d7c731ea5987e0c99daea22ae7f4a ]
When a rewound buffer is created it already has a ref count of 1 and the dummy flag set. Then another ref is taken bumping the count to 2. Finally when this buffer is released from btrfs_release_path the extra reference is decremented by the special handling code in free_extent_buffer.
However, this special code is in fact redundant sinca ref count of 1 is still correct since the buffer is only accessed via btrfs_path struct. This paves the way forward of removing the special handling in free_extent_buffer.
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 8765312743f16..a8660b503bf36 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1372,7 +1372,6 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct btrfs_path *path, btrfs_tree_read_unlock_blocking(eb); free_extent_buffer(eb); - extent_buffer_get(eb_rewin); btrfs_tree_read_lock(eb_rewin); __tree_mod_log_rewind(fs_info, eb_rewin, time_seq, tm); WARN_ON(btrfs_header_nritems(eb_rewin) > -- 2.25.1
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