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authorMiao Xie <miaox@cn.fujitsu.com>2013-02-28 10:01:15 +0000
committerJosef Bacik <jbacik@fusionio.com>2013-02-28 13:33:53 -0500
commite9662f701c85ebc99f532bf8bb53208c0648846a (patch)
treef72d77f7bdea310bc25e70dc71b292dd4d3d287b /fs
parent2d8946c59743bc635a5e5701e6ef8e71e0a16ab7 (diff)
downloadlinux-stericsson-e9662f701c85ebc99f532bf8bb53208c0648846a.tar.gz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ioctl.c10
-rw-r--r--fs/btrfs/transaction.c5
-rw-r--r--fs/btrfs/transaction.h1
3 files changed, 8 insertions, 8 deletions
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;