btrfs: make set_range_writeback return void

Does not return any errors, nor anything from the callgraph. There's a
BUG_ON but it's a sanity check and not an error condition we could
recover from.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index f06800e..efe6ac6 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1485,7 +1485,7 @@ void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end)
 /*
  * helper function to set both pages and extents in the tree writeback
  */
-static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
+static void set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
 {
        unsigned long index = start >> PAGE_CACHE_SHIFT;
        unsigned long end_index = end >> PAGE_CACHE_SHIFT;
@@ -1498,7 +1498,6 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
                page_cache_release(page);
                index++;
        }
-       return 0;
 }
 
 /* find the first state struct with 'bits' set after 'start', and