btrfs: send: fix old buffer length in fs_path_ensure_buf In "btrfs: send: lower memory requirements in common case" the code to save the old_buf_len was incorrectly moved to a wrong place and broke the original logic. Reported-by: Filipe David Manana <fdmanana@gmail.com> Signed-off-by: David Sterba <dsterba@suse.cz> Reviewed-by: Filipe David Manana <fdmanana@gmail.com> Signed-off-by: Josef Bacik <jbacik@fb.com>

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 298e25d..246df85 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c

@@ -346,6 +346,9 @@
 	if (p->buf_len >= len)
 		return 0;
 
+	path_len = p->end - p->start;
+	old_buf_len = p->buf_len;
+
 	/*
 	 * First time the inline_buf does not suffice
 	 */
@@ -368,9 +371,6 @@
 		p->buf_len = ksize(p->buf);
 	}
 
-	path_len = p->end - p->start;
-	old_buf_len = p->buf_len;
-
 	if (p->reversed) {
 		tmp_buf = p->buf + old_buf_len - path_len - 1;
 		p->end = p->buf + p->buf_len - 1;