Fix version fallback for unmount.

Previously, if the mtab record didn't mention a version, unmount
would assume a v3 umount and send an UNMOUNT request accordingly.
This is wrong.

So remove the 'v3' assumption, and allow probe_port to continue when
it gets a version number mis-match.

Also there was some overloading of the meaning of pm_vers==0 relating
to v4 mounts.  As do_nfs_umount is never called for v4, rename it to
do_nfs_umount23, and remove v4 handling from there and from
nfs_call_umount.

Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/utils/mount/network.c b/utils/mount/network.c
index 49d3c6b26d63c33c4b83ae6f497e1fb2a809f87f..63d5f5acdebfbd3a78ef5acbd5439a7bd3e35fcc 100644 (file)
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -408,7 +408,8 @@ static int probe_port(clnt_addr_t *server, const unsigned long *versions,
                                        goto out_bad;
                        }
                }
-               if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED)
+               if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
+                   rpc_createerr.cf_stat != RPC_PROGVERSMISMATCH)
                        goto out_bad;
 
                if (!prot) {
@@ -585,27 +586,16 @@ int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
        enum clnt_stat res = 0;
        int msock;
 
-       switch (mnt_server->pmap.pm_vers) {
-       case 3:
-       case 2:
-       case 1:
-               if (!probe_mntport(mnt_server))
-                       return 0;
-               clnt = mnt_openclnt(mnt_server, &msock);
-               if (!clnt)
-                       return 0;
-               res = clnt_call(clnt, MOUNTPROC_UMNT,
-                               (xdrproc_t)xdr_dirpath, (caddr_t)argp,
-                               (xdrproc_t)xdr_void, NULL,
-                               TIMEOUT);
-               mnt_closeclnt(clnt, msock);
-               if (res == RPC_SUCCESS)
-                       return 1;
-               break;
-       default:
-               res = RPC_SUCCESS;
-               break;
-       }
+       if (!probe_mntport(mnt_server))
+               return 0;
+       clnt = mnt_openclnt(mnt_server, &msock);
+       if (!clnt)
+               return 0;
+       res = clnt_call(clnt, MOUNTPROC_UMNT,
+                       (xdrproc_t)xdr_dirpath, (caddr_t)argp,
+                       (xdrproc_t)xdr_void, NULL,
+                       TIMEOUT);
+       mnt_closeclnt(clnt, msock);
 
        if (res == RPC_SUCCESS)
                return 1;

diff --git a/utils/mount/nfsumount.c b/utils/mount/nfsumount.c
index 9e9cd16a66e8c5d959e07dc8a129716d97adbe9a..285273b9ee56c1e3601ba482bfbc8708d3ba3f74 100644 (file)
--- a/utils/mount/nfsumount.c
+++ b/utils/mount/nfsumount.c
@@ -142,7 +142,7 @@ static int del_mtab(const char *spec, const char *node)
  * We will need this information to get through the firewall again
  * to do the umount.
  */
-static int do_nfs_umount(const char *spec, char *opts)
+static int do_nfs_umount23(const char *spec, char *opts)
 {
        char *hostname;
        char *dirname;
@@ -190,7 +190,7 @@ static int do_nfs_umount(const char *spec, char *opts)
        }
 
        pmap->pm_prog = MOUNTPROG;
-       pmap->pm_vers = MOUNTVERS_NFSV3;
+       pmap->pm_vers = 0; /* unknown */
        if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
                pmap->pm_prog = atoi(p+10);
        if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
@@ -199,8 +199,6 @@ static int do_nfs_umount(const char *spec, char *opts)
                pmap->pm_vers = nfsvers_to_mnt(2);
        if (opts && hasmntopt(&mnt, "v3"))
                pmap->pm_vers = nfsvers_to_mnt(3);
-       if (opts && hasmntopt(&mnt, "v4"))
-               pmap->pm_vers = nfsvers_to_mnt(4);
        if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
                pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
        if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
@@ -349,11 +347,11 @@ int nfsumount(int argc, char *argv[])
        ret = 0;
        if (mc) {
                if (!lazy && strcmp(mc->m.mnt_type, "nfs4") != 0)
-                       ret = do_nfs_umount(mc->m.mnt_fsname, mc->m.mnt_opts);
+                       ret = do_nfs_umount23(mc->m.mnt_fsname, mc->m.mnt_opts);
                ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir) ?: ret;
        } else if (*spec != '/') {
                if (!lazy)
-                       ret = do_nfs_umount(spec, "tcp,v3");
+                       ret = do_nfs_umount23(spec, "tcp,v3");
        } else
                ret = del_mtab(NULL, spec);