btrfs: Make extent-io callbacks that never fail return void

The set/clear bit and the extent split/merge hooks only ever return 0.

 Changing them to return void simplifies the error handling cases later.

 This patch changes the hook prototypes, the single implementation of each,
 and the functions that call them to return void instead.

 Since all four of these hooks execute under a spinlock, they're necessarily
 simple.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 21a7ca9e7282..d6871dc7524f 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -76,15 +76,15 @@ struct extent_io_ops {
 				    struct extent_state *state);
 	int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
 				      struct extent_state *state, int uptodate);
-	int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
-			    int *bits);
-	int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
-			      int *bits);
-	int (*merge_extent_hook)(struct inode *inode,
-				 struct extent_state *new,
-				 struct extent_state *other);
-	int (*split_extent_hook)(struct inode *inode,
-				 struct extent_state *orig, u64 split);
+	void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
+			     int *bits);
+	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
+			       int *bits);
+	void (*merge_extent_hook)(struct inode *inode,
+				  struct extent_state *new,
+				  struct extent_state *other);
+	void (*split_extent_hook)(struct inode *inode,
+				  struct extent_state *orig, u64 split);
 	int (*write_cache_pages_lock_hook)(struct page *page);
 };