NFS: Reduce the stack footprint of nfs_follow_remote_path()
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index b4148fc..fa3111e 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2672,38 +2672,44 @@
static int nfs_follow_remote_path(struct vfsmount *root_mnt,
const char *export_path, struct vfsmount *mnt_target)
{
+ struct nameidata *nd = NULL;
struct mnt_namespace *ns_private;
- struct nameidata nd;
struct super_block *s;
int ret;
+ nd = kmalloc(sizeof(*nd), GFP_KERNEL);
+ if (nd == NULL)
+ return -ENOMEM;
+
ns_private = create_mnt_ns(root_mnt);
ret = PTR_ERR(ns_private);
if (IS_ERR(ns_private))
goto out_mntput;
ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
- export_path, LOOKUP_FOLLOW, &nd);
+ export_path, LOOKUP_FOLLOW, nd);
put_mnt_ns(ns_private);
if (ret != 0)
goto out_err;
- s = nd.path.mnt->mnt_sb;
+ s = nd->path.mnt->mnt_sb;
atomic_inc(&s->s_active);
mnt_target->mnt_sb = s;
- mnt_target->mnt_root = dget(nd.path.dentry);
+ mnt_target->mnt_root = dget(nd->path.dentry);
/* Correct the device pathname */
- nfs_fix_devname(&nd.path, mnt_target);
+ nfs_fix_devname(&nd->path, mnt_target);
- path_put(&nd.path);
+ path_put(&nd->path);
+ kfree(nd);
down_write(&s->s_umount);
return 0;
out_mntput:
mntput(root_mnt);
out_err:
+ kfree(nd);
return ret;
}