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>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 298e25de13ab..246df8513c8a 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -346,6 +346,9 @@ static int fs_path_ensure_buf(struct fs_path *p, int len)
         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 @@ static int fs_path_ensure_buf(struct fs_path *p, int len)
                 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;