utils/nfsd: add support for minorvers4

minorvers4 can be used to either enable or disable nfsv4.x.

If minorvers4 is a positive integer n, in the allowed range (only
minorversion 1 is supported for now), the string "+4.n" is appended
to the versions string written onto /proc/fs/nfsd/versions.

Correspondingly, if minorver4 is a negative integer -n, the string
"-4.n" is written.

With the default value, minorvers4==0, the minor version
setting is not changed.

Note that unlike the protocol versions 2, 3, or 4.  The minor version
setting controls the *maximum* minor version nfsd supports.  Particular
minor version cannot be controlled on their own.  With only minor
version 1 supported at the moment the difference doesn't matter,
but for future minor versions greater than 1, enabling minor
version X will enable support for all minor versions 1 through X.
Disabling minor version X will disable support for minor
versions X and up, enabling 1 through X-1.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/utils/nfsd/nfsd.c b/utils/nfsd/nfsd.c
index c97c81f..ac264da 100644
--- a/utils/nfsd/nfsd.c
+++ b/utils/nfsd/nfsd.c
@@ -41,6 +41,7 @@ static struct option longopts[] =
 };
 unsigned int protobits = NFSCTL_ALLBITS;
 unsigned int versbits = NFSCTL_ALLBITS;
+int minorvers4;				/* nfsv4 minor version */
 char *haddr = NULL;
 
 int
@@ -158,7 +159,7 @@ main(int argc, char **argv)
 	closeall(3);
 
 	openlog("nfsd", LOG_PID, LOG_DAEMON);
-	if ((error = nfssvc(port, count, versbits, protobits, haddr)) < 0) {
+	if ((error = nfssvc(port, count, versbits, minorvers4, protobits, haddr)) < 0) {
 		int e = errno;
 		syslog(LOG_ERR, "nfssvc: %s", strerror(e));
 		closelog();