Btrfs: remove unnecessary transaction commit before send

We will finish orphan cleanups during snapshot, so we don't
have to commit transaction here.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 4e2461b..591063d 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4775,35 +4775,6 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
         */
        WARN_ON(send_root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE);
 
-       /*
-        * If we just created this root we need to make sure that the orphan
-        * cleanup has been done and committed since we search the commit root,
-        * so check its commit root transid with our otransid and if they match
-        * commit the transaction to make sure everything is updated.
-        */
-       down_read(&send_root->fs_info->extent_commit_sem);
-       if (btrfs_header_generation(send_root->commit_root) ==
-           btrfs_root_otransid(&send_root->root_item)) {
-               struct btrfs_trans_handle *trans;
-
-               up_read(&send_root->fs_info->extent_commit_sem);
-
-               trans = btrfs_attach_transaction_barrier(send_root);
-               if (IS_ERR(trans)) {
-                       if (PTR_ERR(trans) != -ENOENT) {
-                               ret = PTR_ERR(trans);
-                               goto out;
-                       }
-                       /* ENOENT means theres no transaction */
-               } else {
-                       ret = btrfs_commit_transaction(trans, send_root);
-                       if (ret)
-                               goto out;
-               }
-       } else {
-               up_read(&send_root->fs_info->extent_commit_sem);
-       }
-
        /*
         * Userspace tools do the checks and warn the user if it's
         * not RO.