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get rid of useless dget_parent() in fs/btrfs/ioctl.c

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both callers there have dentry->d_parent stabilized by the fact that
their caller had obtained dentry from lookup_one_len() and had not
dropped ->i_mutex on parent since then.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-07-16 21:38:06 -04:00
parent 02c24a8218
commit 2fbe8c8ad1
1 changed files with 4 additions and 12 deletions
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16
fs/btrfs/ioctl.c
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@ -323,7 +323,7 @@ static noinline int create_subvol(struct btrfs_root *root,
struct btrfs_inode_item *inode_item;
struct extent_buffer *leaf;
struct btrfs_root *new_root;
struct dentry *parent = dget_parent(dentry);
struct dentry *parent = dentry->d_parent;
struct inode *dir;
int ret;
int err;
@ -332,10 +332,8 @@ static noinline int create_subvol(struct btrfs_root *root,
u64 index = 0;
ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
if (ret) {
dput(parent);
if (ret)
return ret;
}
dir = parent->d_inode;
@ -346,10 +344,8 @@ static noinline int create_subvol(struct btrfs_root *root,
* 2 - dir items
*/
trans = btrfs_start_transaction(root, 6);
if (IS_ERR(trans)) {
dput(parent);
if (IS_ERR(trans))
return PTR_ERR(trans);
}
leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
0, objectid, NULL, 0, 0, 0);
@ -439,7 +435,6 @@ static noinline int create_subvol(struct btrfs_root *root,
d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
fail:
dput(parent);
if (async_transid) {
*async_transid = trans->transid;
err = btrfs_commit_transaction_async(trans, root, 1);
@ -456,7 +451,6 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
bool readonly)
{
struct inode *inode;
struct dentry *parent;
struct btrfs_pending_snapshot *pending_snapshot;
struct btrfs_trans_handle *trans;
int ret;
@ -504,9 +498,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
if (ret)
goto fail;
parent = dget_parent(dentry);
inode = btrfs_lookup_dentry(parent->d_inode, dentry);
dput(parent);
inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
goto fail;