From: NeilBrown <neilb@suse.de>
Date: Wed, 3 Jun 2009 19:48:08 +0000 (-0400)
Subject: Retry export if getfh fails.
X-Git-Tag: nfs-utils-1-2-1-rc1~3
X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=commitdiff_plain;h=abf92485ae52bd637d544e2ac73147271b310a14;hp=ab20f16a06e4f476b6480ddd27da724d14631411

Retry export if getfh fails.

mountd tries to avoid telling the kernel to export something
when the kernel already knows to do that.
However sometimes (exportfs -r) the kernel can be told
to forget something without mountd realising.
So if mountd finds that it cannot get a  valid filehandle,
make sure it really has been exported to the kernel.

This only applies if the nfsd filesystem is not mounted.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
---

diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
index 25d292b..b59f939 100644
--- a/utils/mountd/mountd.c
+++ b/utils/mountd/mountd.c
@@ -467,8 +467,12 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, nfs_export **expret,
 			return NULL;
 		}
 	} else {
-		if (exp->m_exported<1)
+		int did_export = 0;
+	retry:
+		if (exp->m_exported<1) {
 			export_export(exp);
+			did_export = 1;
+		}
 		if (!exp->m_xtabent)
 			xtab_append(exp);
 
@@ -482,6 +486,11 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, nfs_export **expret,
 				fh = getfh_old ((struct sockaddr *) sin,
 						stb.st_dev, stb.st_ino);
 		}
+		if (fh == NULL && !did_export) {
+			exp->m_exported = 0;
+			goto retry;
+		}
+
 		if (fh == NULL) {
 			xlog(L_WARNING, "getfh failed: %s", strerror(errno));
 			*error = NFSERR_ACCES;