Btrfs: avoid unnecessary utimes update in incremental send

When we're finishing processing of an inode, if we're dealing with a
directory inode that has a pending move/rename operation, we don't
need to send a utimes update instruction to the send stream, as we'll
do it later after doing the move/rename operation. Therefore we save
some time here building paths and doing btree lookups.

Signed-off-by: Filipe David Borba 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 c2522e4..9d057ef 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4957,18 +4957,19 @@ static int finish_inode_if_needed(struct send_ctx *sctx, int at_end)
                ret = apply_children_dir_moves(sctx);
                if (ret)
                        goto out;
+               /*
+                * Need to send that every time, no matter if it actually
+                * changed between the two trees as we have done changes to
+                * the inode before. If our inode is a directory and it's
+                * waiting to be moved/renamed, we will send its utimes when
+                * it's moved/renamed, therefore we don't need to do it here.
+                */
+               sctx->send_progress = sctx->cur_ino + 1;
+               ret = send_utimes(sctx, sctx->cur_ino, sctx->cur_inode_gen);
+               if (ret < 0)
+                       goto out;
        }
 
-       /*
-        * Need to send that every time, no matter if it actually
-        * changed between the two trees as we have done changes to
-        * the inode before.
-        */
-       sctx->send_progress = sctx->cur_ino + 1;
-       ret = send_utimes(sctx, sctx->cur_ino, sctx->cur_inode_gen);
-       if (ret < 0)
-               goto out;
-
 out:
        return ret;
 }