Btrfs: remove unnecessary dget_parent/dput when creating the pending snapshot

Since we have grabbed the parent inode at the beginning of the
snapshot creation, and both sync and async snapshot creation
release it after the pending snapshots are actually created,
it is safe to access the parent inode directly during the snapshot
creation, we needn't use dget_parent/dput to fix the parent dentry
and get the dir inode.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 3733c4939a27..71de435a291e 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1068,7 +1068,6 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         struct inode *parent_inode;
         struct btrfs_path *path;
         struct btrfs_dir_item *dir_item;
-        struct dentry *parent;
         struct dentry *dentry;
         struct extent_buffer *tmp;
         struct extent_buffer *old;
@@ -1126,8 +1125,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         trans->bytes_reserved = trans->block_rsv->reserved;
 
         dentry = pending->dentry;
-        parent = dget_parent(dentry);
-        parent_inode = parent->d_inode;
+        parent_inode = pending->dir;
         parent_root = BTRFS_I(parent_inode)->root;
         record_root_in_trans(trans, parent_root);
 
@@ -1275,7 +1273,6 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
         if (ret)
                 btrfs_abort_transaction(trans, root, ret);
 fail:
-        dput(parent);
         trans->block_rsv = rsv;
         trans->bytes_reserved = 0;
 no_free_objectid: