From 75c5d1cb5ab6b45ed9b3d718d8c284bcb86f80de Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@citi.umich.edu>
Date: Sun, 25 Oct 2009 21:33:15 -0400
Subject: [PATCH] --- yaml --- r: 177204 b: refs/heads/master c:
 82ead7fe41da960ed80652d13d5a1072f85f5aca h: refs/heads/master v: v3

---
 [refs]              |  2 +-
 trunk/fs/nfsd/vfs.c | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 795da3ff661b..9a69348dfed4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3b6cee7bc4b2f7858e9202293104acda8826bb68
+refs/heads/master: 82ead7fe41da960ed80652d13d5a1072f85f5aca
diff --git a/trunk/fs/nfsd/vfs.c b/trunk/fs/nfsd/vfs.c
index 7e2fdd50113f..eaf2f0dca12a 100644
--- a/trunk/fs/nfsd/vfs.c
+++ b/trunk/fs/nfsd/vfs.c
@@ -166,6 +166,19 @@ static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, st
 	return 0;
 }
 
+/*
+ * For nfsd purposes, we treat V4ROOT exports as though there was an
+ * export at *every* directory.
+ */
+static int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
+{
+	if (d_mountpoint(dentry))
+		return 1;
+	if (!(exp->ex_flags & NFSEXP_V4ROOT))
+		return 0;
+	return dentry->d_inode != NULL;
+}
+
 __be32
 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		   const char *name, unsigned int len,
@@ -211,7 +224,7 @@ nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		/*
 		 * check if we have crossed a mount point ...
 		 */
-		if (d_mountpoint(dentry)) {
+		if (nfsd_mountpoint(dentry, exp)) {
 			if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
 				dput(dentry);
 				goto out_nfserr;