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authorBryan Schumaker <bjschuma@netapp.com>2012-04-27 21:27:41 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-27 22:10:02 +0400
commitf05d147f7e3cf0d86b3a4bd5603029a7cb109633 (patch)
treee351ef7dd3d541626f5cccef86f50906bfb3a649 /fs/nfs/namespace.c
parent72de53ec4bca39c26709122a8f78bfefe7b6bca4 (diff)
downloadlinux-f05d147f7e3cf0d86b3a4bd5603029a7cb109633.tar.xz
NFS: Fix following referral mount points with different security
I create a new proc_lookup_mountpoint() to use when submounting an NFS v4 share. This function returns an rpc_clnt to use for performing an fs_locations() call on a referral's mountpoint. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/namespace.c')
-rw-r--r--fs/nfs/namespace.c44
1 files changed, 34 insertions, 10 deletions
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 1807866bb3ab..b9a593d056b3 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -200,6 +200,22 @@ out_shutdown:
out:
return err;
}
+
+static struct rpc_clnt *nfs_lookup_mountpoint(struct inode *dir,
+ struct qstr *name,
+ struct nfs_fh *fh,
+ struct nfs_fattr *fattr)
+{
+ int err;
+
+ if (NFS_PROTO(dir)->version == 4)
+ return nfs4_proc_lookup_mountpoint(dir, name, fh, fattr);
+
+ err = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, name, fh, fattr);
+ if (err)
+ return ERR_PTR(err);
+ return rpc_clone_client(NFS_SERVER(dir)->client);
+}
#else /* CONFIG_NFS_V4 */
static inline int nfs_lookup_with_sec(struct nfs_server *server,
struct dentry *parent, struct dentry *dentry,
@@ -209,6 +225,17 @@ static inline int nfs_lookup_with_sec(struct nfs_server *server,
{
return -EPERM;
}
+
+static inline struct rpc_clnt *nfs_lookup_mountpoint(struct inode *dir,
+ struct qstr *name,
+ struct nfs_fh *fh,
+ struct nfs_fattr *fattr)
+{
+ int err = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, name, fh, fattr);
+ if (err)
+ return ERR_PTR(err);
+ return rpc_clone_client(NFS_SERVER(dir)->client);
+}
#endif /* CONFIG_NFS_V4 */
/*
@@ -226,11 +253,10 @@ static inline int nfs_lookup_with_sec(struct nfs_server *server,
struct vfsmount *nfs_d_automount(struct path *path)
{
struct vfsmount *mnt;
- struct nfs_server *server = NFS_SERVER(path->dentry->d_inode);
struct dentry *parent;
struct nfs_fh *fh = NULL;
struct nfs_fattr *fattr = NULL;
- int err;
+ struct rpc_clnt *client;
rpc_authflavor_t flavor = RPC_AUTH_UNIX;
dprintk("--> nfs_d_automount()\n");
@@ -249,21 +275,19 @@ struct vfsmount *nfs_d_automount(struct path *path)
/* Look it up again to get its attributes */
parent = dget_parent(path->dentry);
- err = server->nfs_client->rpc_ops->lookup(server->client, parent->d_inode,
- &path->dentry->d_name,
- fh, fattr);
- if (err == -EPERM && NFS_PROTO(parent->d_inode)->secinfo != NULL)
- err = nfs_lookup_with_sec(server, parent, path->dentry, path, fh, fattr, &flavor);
+ client = nfs_lookup_mountpoint(parent->d_inode, &path->dentry->d_name, fh, fattr);
dput(parent);
- if (err != 0) {
- mnt = ERR_PTR(err);
+ if (IS_ERR(client)) {
+ mnt = ERR_CAST(client);
goto out;
}
if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
- mnt = nfs_do_refmount(path->dentry);
+ mnt = nfs_do_refmount(client, path->dentry);
else
mnt = nfs_do_submount(path->dentry, fh, fattr, flavor);
+ rpc_shutdown_client(client);
+
if (IS_ERR(mnt))
goto out;