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

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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:
Rick Macklem 2016-11-19 23:58:50 +00:00
parent 4e44c386ff
commit 49a8bad7d6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=308871
1 changed files with 22 additions and 2 deletions
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24
sbin/umount/umount.c
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@ -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"));