Modify umount so that it does not do an Unmount RPC for NFSv4 mounts

and uses TCP for the Unmount RPC if the mount is over TCP.
Without this patch, umount does an Unmount RPC over UDP for all NFS mounts.

Suggested by:	cperciva
Reviewed by:	cperciva
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D8503
This commit is contained in:
rmacklem 2016-11-19 23:58:50 +00:00
parent 9feb36eb5f
commit 655307b888

View File

@ -49,6 +49,7 @@ static const char rcsid[] =
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpcsvc/mount.h>
#include <nfs/nfssvc.h>
#include <ctype.h>
#include <err.h>
@ -323,6 +324,9 @@ umountfs(struct statfs *sfs)
CLIENT *clp;
char *nfsdirname, *orignfsdirname;
char *hostp, *delimp;
char buf[1024];
struct nfscl_dumpmntopts dumpmntopts;
const char *proto_ptr = NULL;
ai = NULL;
do_rpc = 0;
@ -361,8 +365,24 @@ umountfs(struct statfs *sfs)
* mount from mntfromname that is still mounted.
*/
if (getmntentry(sfs->f_mntfromname, NULL, NULL,
CHECKUNIQUE) != NULL)
CHECKUNIQUE) != NULL) {
do_rpc = 1;
proto_ptr = "udp";
/*
* Try and find out whether this NFS mount is NFSv4 and
* what protocol is being used. If this fails, the
* default is NFSv2,3 and use UDP for the Unmount RPC.
*/
dumpmntopts.ndmnt_fname = sfs->f_mntonname;
dumpmntopts.ndmnt_buf = buf;
dumpmntopts.ndmnt_blen = sizeof(buf);
if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) {
if (strstr(buf, "nfsv4,") != NULL)
do_rpc = 0;
else if (strstr(buf, ",tcp,") != NULL)
proto_ptr = "tcp";
}
}
}
if (!namematch(ai)) {
@ -400,7 +420,7 @@ umountfs(struct statfs *sfs)
* has been unmounted.
*/
if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, "udp");
clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr);
if (clp == NULL) {
warnx("%s: %s", hostp,
clnt_spcreateerror("MOUNTPROG"));