NFSv4: Reduce stack footprint of nfs4_get_root()
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index ada369a..7428f7d 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -78,46 +78,52 @@
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fsinfo fsinfo;
- struct nfs_fattr fattr;
- struct dentry *mntroot;
+ struct dentry *ret;
struct inode *inode;
int error;
/* get the actual root for this mount */
- fsinfo.fattr = &fattr;
+ fsinfo.fattr = nfs_alloc_fattr();
+ if (fsinfo.fattr == NULL)
+ return ERR_PTR(-ENOMEM);
error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
- return ERR_PTR(error);
+ ret = ERR_PTR(error);
+ goto out;
}
inode = nfs_fhget(sb, mntfh, fsinfo.fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
- return ERR_CAST(inode);
+ ret = ERR_CAST(inode);
+ goto out;
}
error = nfs_superblock_set_dummy_root(sb, inode);
- if (error != 0)
- return ERR_PTR(error);
+ if (error != 0) {
+ ret = ERR_PTR(error);
+ goto out;
+ }
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
- mntroot = d_obtain_alias(inode);
- if (IS_ERR(mntroot)) {
+ ret = d_obtain_alias(inode);
+ if (IS_ERR(ret)) {
dprintk("nfs_get_root: get root dentry failed\n");
- return mntroot;
+ goto out;
}
- security_d_instantiate(mntroot, inode);
+ security_d_instantiate(ret, inode);
- if (!mntroot->d_op)
- mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
-
- return mntroot;
+ if (ret->d_op == NULL)
+ ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+out:
+ nfs_free_fattr(fsinfo.fattr);
+ return ret;
}
#ifdef CONFIG_NFS_V4
@@ -168,8 +174,8 @@
struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
- struct nfs_fattr fattr;
- struct dentry *mntroot;
+ struct nfs_fattr *fattr = NULL;
+ struct dentry *ret;
struct inode *inode;
int error;
@@ -183,40 +189,50 @@
return ERR_PTR(error);
}
+ fattr = nfs_alloc_fattr();
+ if (fattr == NULL)
+ return ERR_PTR(-ENOMEM);;
+
/* get the actual root for this mount */
- error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
+ error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
- return ERR_PTR(error);
+ ret = ERR_PTR(error);
+ goto out;
}
- inode = nfs_fhget(sb, mntfh, &fattr);
+ inode = nfs_fhget(sb, mntfh, fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
- return ERR_CAST(inode);
+ ret = ERR_CAST(inode);
+ goto out;
}
error = nfs_superblock_set_dummy_root(sb, inode);
- if (error != 0)
- return ERR_PTR(error);
+ if (error != 0) {
+ ret = ERR_PTR(error);
+ goto out;
+ }
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
- mntroot = d_obtain_alias(inode);
- if (IS_ERR(mntroot)) {
+ ret = d_obtain_alias(inode);
+ if (IS_ERR(ret)) {
dprintk("nfs_get_root: get root dentry failed\n");
- return mntroot;
+ goto out;
}
- security_d_instantiate(mntroot, inode);
+ security_d_instantiate(ret, inode);
- if (!mntroot->d_op)
- mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
+ if (ret->d_op == NULL)
+ ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+out:
+ nfs_free_fattr(fattr);
dprintk("<-- nfs4_get_root()\n");
- return mntroot;
+ return ret;
}
#endif /* CONFIG_NFS_V4 */