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NFS: Reduce the stack footprint of nfs_follow_remote_path()

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2010-04-16 16:22:48 -04:00
parent e1fb4d05d5
commit 04ffdbe2e6
1 changed files with 12 additions and 6 deletions
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18
fs/nfs/super.c
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@ -2672,38 +2672,44 @@ out_freepage:
static int nfs_follow_remote_path(struct vfsmount *root_mnt, static int nfs_follow_remote_path(struct vfsmount *root_mnt,
const char *export_path, struct vfsmount *mnt_target) const char *export_path, struct vfsmount *mnt_target)
{ {
struct nameidata *nd = NULL;
struct mnt_namespace *ns_private; struct mnt_namespace *ns_private;
struct nameidata nd;
struct super_block *s; struct super_block *s;
int ret; int ret;
nd = kmalloc(sizeof(*nd), GFP_KERNEL);
if (nd == NULL)
return -ENOMEM;
ns_private = create_mnt_ns(root_mnt); ns_private = create_mnt_ns(root_mnt);
ret = PTR_ERR(ns_private); ret = PTR_ERR(ns_private);
if (IS_ERR(ns_private)) if (IS_ERR(ns_private))
goto out_mntput; goto out_mntput;
ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt, 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); put_mnt_ns(ns_private);
if (ret != 0) if (ret != 0)
goto out_err; goto out_err;
s = nd.path.mnt->mnt_sb; s = nd->path.mnt->mnt_sb;
atomic_inc(&s->s_active); atomic_inc(&s->s_active);
mnt_target->mnt_sb = s; 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 */ /* 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); down_write(&s->s_umount);
return 0; return 0;
out_mntput: out_mntput:
mntput(root_mnt); mntput(root_mnt);
out_err: out_err:
kfree(nd);
return ret; return ret;
} }