NFS: Ensure the client submounts, when it crosses a server mountpoint.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 1d3d892..3ddda6f 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -868,6 +868,17 @@
return (nd->intent.open.flags & O_EXCL) != 0;
}
+static inline int nfs_reval_fsid(struct inode *dir,
+ struct nfs_fh *fh, struct nfs_fattr *fattr)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+
+ if (!nfs_fsid_equal(&server->fsid, &fattr->fsid))
+ /* Revalidate fsid on root dir */
+ return __nfs_revalidate_inode(server, dir->i_sb->s_root->d_inode);
+ return 0;
+}
+
static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
{
struct dentry *res;
@@ -900,6 +911,11 @@
res = ERR_PTR(error);
goto out_unlock;
}
+ error = nfs_reval_fsid(dir, &fhandle, &fattr);
+ if (error < 0) {
+ res = ERR_PTR(error);
+ goto out_unlock;
+ }
inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr);
res = (struct dentry *)inode;
if (IS_ERR(res))