On Tue, Nov 27, 2018 at 08:53:55PM +0100, David Sterba wrote:
> We can use simple enum for values that are not part of on-disk format:
> tree lock types.
>
> Signed-off-by: David Sterba <dste...@suse.com>
> ---
> fs/btrfs/locking.h | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h
> index 29135def468e..684d0ef4faa4 100644
> --- a/fs/btrfs/locking.h
> +++ b/fs/btrfs/locking.h
> @@ -6,10 +6,12 @@
> #ifndef BTRFS_LOCKING_H
> #define BTRFS_LOCKING_H
>
> -#define BTRFS_WRITE_LOCK 1
> -#define BTRFS_READ_LOCK 2
> -#define BTRFS_WRITE_LOCK_BLOCKING 3
> -#define BTRFS_READ_LOCK_BLOCKING 4
> +enum {
> + BTRFS_WRITE_LOCK,
See btrfs_set_path_blocking() and btrfs_release_path(); 0 means no lock,
so this needs to be BTRFS_WRITE_LOCK = 1. I imagine that lockdep would
catch this.
> + BTRFS_READ_LOCK,
> + BTRFS_WRITE_LOCK_BLOCKING,
> + BTRFS_READ_LOCK_BLOCKING,
> +};
>
> void btrfs_tree_lock(struct extent_buffer *eb);
> void btrfs_tree_unlock(struct extent_buffer *eb);
> --
> 2.19.1
>
