[PATCH] btrfs: Remove dead code btrfs_get_extent

[Nikolay Borisov <nborisov@suse.com>]

trans was statically assigned to NULL and this never changes over the course of
btrfs_get_extent. This was added in commit a52d9a8033c4 ("Btrfs: Extent based
page cache code.  This uses an rbtree of extents and tests instead of buffer
heads.") and wasn't used even then, which indicates it was never intended to be
merged. So remove any code which checks whether trans != NULL and
just hardcode the fact trans is always NULL. This fixes CID#112806

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/inode.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 57785eadb95c..92d140b06271 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6943,7 +6943,6 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 	struct extent_map *em = NULL;
 	struct extent_map_tree *em_tree = &inode->extent_tree;
 	struct extent_io_tree *io_tree = &inode->io_tree;
-	struct btrfs_trans_handle *trans = NULL;
 	const bool new_inline = !page || create;
 
 	read_lock(&em_tree->lock);
@@ -6984,8 +6983,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 		path->reada = READA_FORWARD;
 	}
 
-	ret = btrfs_lookup_file_extent(trans, root, path,
-				       objectid, start, trans != NULL);
+	ret = btrfs_lookup_file_extent(NULL, root, path, objectid, start, 0);
 	if (ret < 0) {
 		err = ret;
 		goto out;
@@ -7181,11 +7179,6 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 	trace_btrfs_get_extent(root, inode, em);
 
 	btrfs_free_path(path);
-	if (trans) {
-		ret = btrfs_end_transaction(trans);
-		if (!err)
-			err = ret;
-	}
 	if (err) {
 		free_extent_map(em);
 		return ERR_PTR(err);
-- 
2.7.4