[nfs-utils PATCH] retry on EPERM from NFSv4 mount attempt

[Neil Brown <neilb@suse.de>]

Hi,
 I recently packaged nfs-utils 1.2.1 for openSUSE and fairly quickly
 got a bug report - "-o nfsvers=3" was needed to mount NFSv3
 filesystems.

 mount.nfs in 1.2.1 will first try a v4 mount but will fall-back to v3
 if it gets ENOENT.  This works fine.
 However for kernel prior to 2.6.25, you don't get ENOENT, you get
 EPERM.
 In that case the fall-back to v3 doesn't happen and you get a failure
 to mount.

 So I think we need to fall back on EPERM as well.  See below.

Thanks,
NeilBrown


diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index b595649..68eb82b 100644
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -657,8 +657,10 @@ static int nfs_try_mount(struct nfsmount_info *mi)
 				 * To deal with legacy Linux servers that don't
 				 * automatically export a pseudo root, retry
 				 * ENOENT errors using version 3
+				 * And for Linux servers prior to 2.6.25, retry
+				 * EPERM
 				 */
-				if (errno != ENOENT)
+				if (errno != ENOENT && errno != EPERM)
 					break;
 			}
 		}