On 12.09.2018 01:06, Liu Bo wrote:
> It might get @leaf and @key in order to do some sanity checks on key's
> fields, but since we don't check it any more, it's fine to remove the
> code.
This is actually false, leaf and key weren't used for sanity checks.
Instead this code was first introduced in 5f39d397dfbe ("Btrfs: Create
extent_buffer interface for large blocksizes") and the function was
named btrfs_unlink_trans. It later got renamed to __btrfs_unlink_inode
and finally commit 16cdcec736cd ("btrfs: implement delayed inode items
operation") changed the way inodes are deleted and obviated the need for
those two members.
Generally when unused variables are deleted you need to do a bit of
archeology and explain how they got to be unused in the changelog.
>
> Signed-off-by: Liu Bo
> ---
> fs/btrfs/inode.c | 4
> 1 file changed, 4 deletions(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index d3febc3a6bc0..fd64d7ac76f9 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -3911,9 +3911,7 @@ static int __btrfs_unlink_inode(struct
> btrfs_trans_handle *trans,
> struct btrfs_fs_info *fs_info = root->fs_info;
> struct btrfs_path *path;
> int ret = 0;
> - struct extent_buffer *leaf;
> struct btrfs_dir_item *di;
> - struct btrfs_key key;
> u64 index;
> u64 ino = btrfs_ino(inode);
> u64 dir_ino = btrfs_ino(dir);
> @@ -3935,8 +3933,6 @@ static int __btrfs_unlink_inode(struct
> btrfs_trans_handle *trans,
> ret = -ENOENT;
> goto err;
> }
> - leaf = path->nodes[0];
> - btrfs_dir_item_key_to_cpu(leaf, di, &key);
> ret = btrfs_delete_one_dir_name(trans, root, path, di);
> if (ret)
> goto err;
>
