From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 28 Feb 2013 10:01:15 +0000 (+0000)
Subject: Btrfs: remove unnecessary dget_parent/dput when creating the pending snapshot
X-Git-Tag: MMI-PSA29.97-13-9~14657^2~39
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e9662f701c85ebc99f532bf8bb53208c0648846a;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

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>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 059546aa8fdf..8dcd4ff0c3a5 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -530,9 +530,10 @@ fail:
 	return ret;
 }
 
-static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
-			   char *name, int namelen, u64 *async_transid,
-			   bool readonly, struct btrfs_qgroup_inherit *inherit)
+static int create_snapshot(struct btrfs_root *root, struct inode *dir,
+			   struct dentry *dentry, char *name, int namelen,
+			   u64 *async_transid, bool readonly,
+			   struct btrfs_qgroup_inherit *inherit)
 {
 	struct inode *inode;
 	struct btrfs_pending_snapshot *pending_snapshot;
@@ -551,6 +552,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
 	pending_snapshot->dentry = dentry;
 	pending_snapshot->root = root;
 	pending_snapshot->readonly = readonly;
+	pending_snapshot->dir = dir;
 	pending_snapshot->inherit = inherit;
 
 	trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
@@ -728,7 +730,7 @@ static noinline int btrfs_mksubvol(struct path *parent,
 		goto out_up_read;
 
 	if (snap_src) {
-		error = create_snapshot(snap_src, dentry, name, namelen,
+		error = create_snapshot(snap_src, dir, dentry, name, namelen,
 					async_transid, readonly, inherit);
 	} else {
 		error = create_subvol(BTRFS_I(dir)->root, dentry,
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:
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 5afd7b1dceac..5f67fba07ab4 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -84,6 +84,7 @@ struct btrfs_trans_handle {
 
 struct btrfs_pending_snapshot {
 	struct dentry *dentry;
+	struct inode *dir;
 	struct btrfs_root *root;
 	struct btrfs_root *snap;
 	struct btrfs_qgroup_inherit *inherit;