[patch 004/149] NFSD: dont report compiled-out versions as present

Greg KH
2010-07-01T18:55:50Z

2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

From: Pavel Emelyanov <xemul@openvz.org>

commit 15ddb4aec54422ead137b03ea4e9b3f5db3f7cc2 upstream.

The /proc/fs/nfsd/versions file calls nfsd_vers() to check whether
the particular nfsd version is present/available. The problem is
that once I turn off e.g. NFSD-V4 this call returns -1 which is
true from the callers POV which is wrong.

The proposal is to report false in that case.

The bug has existed since 6658d3a7bbfd1768 "[PATCH] knfsd: remove
nfsd_versbits as intermediate storage for desired versions".

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/nfsd/nfssvc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -136,7 +136,7 @@ u32 nfsd_supported_minorversion;
int nfsd_vers(int vers, enum vers_op change)
{
if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
- return -1;
+ return 0;
switch(change) {
case NFSD_SET:
nfsd_versions[vers] = nfsd_version[vers];