NFS: Don't silently fail setattr() requests on mountpoints

[firefly-linux-kernel-4.4.55.git] / fs / nfs / namespace.c

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index dd057bc6b65b28d3822229e0c0d5d0777b7955b9..fc8dc20fdeb9c90274d5acb8ef2bb831af297425 100644 (file)
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -177,11 +177,31 @@ out_nofree:
        return mnt;
 }
 
+static int
+nfs_namespace_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+       if (NFS_FH(dentry->d_inode)->size != 0)
+               return nfs_getattr(mnt, dentry, stat);
+       generic_fillattr(dentry->d_inode, stat);
+       return 0;
+}
+
+static int
+nfs_namespace_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       if (NFS_FH(dentry->d_inode)->size != 0)
+               return nfs_setattr(dentry, attr);
+       return -EACCES;
+}
+
 const struct inode_operations nfs_mountpoint_inode_operations = {
        .getattr        = nfs_getattr,
+       .setattr        = nfs_setattr,
 };
 
 const struct inode_operations nfs_referral_inode_operations = {
+       .getattr        = nfs_namespace_getattr,
+       .setattr        = nfs_namespace_setattr,
 };
 
 static void nfs_expire_automounts(struct work_struct *work)