btrfs: add helpers for compression type and level

It is very easy to miss places that rely on a certain bitshifting for
decoding the type_level overloading. Add helpers to do this instead.

Cc: Omar Sandoval <osandov@osandov.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index 970ff3e35bb3..2bd655c4f8b4 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -393,7 +393,7 @@ next:
 static void zlib_set_level(struct list_head *ws, unsigned int type)
 {
         struct workspace *workspace = list_entry(ws, struct workspace, list);
-        unsigned level = (type & 0xF0) >> 4;
+        unsigned int level = btrfs_compress_level(type);
 
         if (level > 9)
                 level = 9;