btrfs: clean up the check for uncompressed ranges in submit_one_async_extent

Instead of checking for a NULL !pages and explaining this with a cryptic
comment, just check the compression type for BTRFS_COMPRESS_NONE to make
the check self-explanatory.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ada70af..27fdfd0 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1206,8 +1206,7 @@ static void submit_one_async_extent(struct async_chunk *async_chunk,
        }
        lock_extent(io_tree, start, end, NULL);
 
-       /* We have fall back to uncompressed write */
-       if (!async_extent->pages) {
+       if (async_extent->compress_type == BTRFS_COMPRESS_NONE) {
                submit_uncompressed_range(inode, async_extent, locked_page);
                goto done;
        }