[PATCH] nfs-utils: exportfs: automatically set 'nohide' on referral exports.

[PATCH] nfs-utils: exportfs: automatically set 'nohide' on referral exports.

[Steve Dickson]

To activate referral mounts, the local directory (on the
server) has to be --bind mounted (i.e. mount --bind . .),
which means when the local directory is accessed (by the client)
a mount point is being crossed. If the 'nohide' is not
set on the export (or crossmnt on the parent export) the
referral *silently* fails since the mount point can not be
crossed.

This silent failure  makes it almost impossible to figure
out why referral mounts fail, since there is no error message
or network traffic. So by setting the nohide option automatically
this silent failure is eliminated.

This patch is relative to the Fedora nfs-utils git tree:
git://git.infradead.org/~steved/nfs-utils.fedora

but does apply to Neil's git tree.

steved.


commit 34038ab17a5fa157bfee103eb3fe58bb999b40a4
Author: Steve Dickson <steved@dickson.boston.devel.redhat.com>
Date:   Tue Oct 2 09:56:42 2007 -0400

     This patch turns on the 'nohide' export option automatically
     for all FS location exports due to the fact this option
     is need to for referral mount to work.

     Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index 5fc3e4a..40012c3 100644
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -508,6 +508,12 @@ bad_option:
  		while (isblank(*cp))
  			cp++;
  	}
+	/*
+	 * Turn on nohide which will allow this export to cross over
+	 * the 'mount --bind' mount point.
+	 */
+	if (ep->e_fslocdata)
+		ep->e_flags |= NFSEXP_NOHIDE;

  	ep->e_squids = squids;
  	ep->e_sqgids = sqgids;

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