static int nfs_do_mount_v4(struct nfsmount_info *mi,
struct sockaddr *sap, socklen_t salen)
{
struct mount_options *options = po_dup(mi->options);
int result = 0;
if (!options) {
errno = ENOMEM;
return result;
}
if (mi->version == 0) {
if (po_contains(options, "mounthost") ||
po_contains(options, "mountaddr") ||
po_contains(options, "mountvers") ||
po_contains(options, "mountproto")) {
/*
* Since these mountd options are set assume version 3
* is wanted so error out with EPROTONOSUPPORT so the
* protocol negation starts with v3.
*/
errno = EPROTONOSUPPORT;
goto out_fail;
}
if (po_append(options, "vers=4") == PO_FAILED) {
errno = EINVAL;
goto out_fail;
}
}
if (!nfs_append_addr_option(sap, salen, options)) {
errno = EINVAL;
goto out_fail;
}
if (!nfs_append_clientaddr_option(sap, salen, options)) {
errno = EINVAL;
goto out_fail;
}
/*
* Update option string to be recorded in /etc/mtab.
*/
if (po_join(options, mi->extra_opts) == PO_FAILED) {
errno = ENOMEM;
goto out_fail;
}
if (verbose)
printf(_("%s: trying text-based options '%s'\n"),
progname, *mi->extra_opts);
result = nfs_sys_mount(mi, options);
out_fail:
po_destroy(options);
return result;
}
static int nfs_set_version(struct nfsmount_info *mi)
{
if (!nfs_nfs_version(mi->options, &mi->version))
return 0;
if (strncmp(mi->type, "nfs4", 4) == 0)
mi->version = 4;
/*
* Before 2.6.32, the kernel NFS client didn't
* support "-t nfs vers=4" mounts, so NFS version
* 4 cannot be included when autonegotiating
* while running on those kernels.
*/
if (mi->version == 0 &&
linux_version_code() <= MAKE_VERSION(2, 6, 31))
mi->version = 3;
/*
* If we still don't know, check for version-specific
* mount options.
*/
if (mi->version == 0) {
if (po_contains(mi->options, "mounthost") ||
po_contains(mi->options, "mountaddr") ||
po_contains(mi->options, "mountvers") ||
po_contains(mi->options, "mountproto"))
mi->version = 3;
}
/*
* If enabled, see if the default version was
* set in the config file
*/
nfs_default_version(mi);
return 1;
}
/*
* Called to discover our address and append an appropriate 'clientaddr='
* option to the options string.
*
* Returns 1 if 'clientaddr=' option created successfully or if
* 'clientaddr=' option is already present; otherwise zero.
*/
static int nfs_append_clientaddr_option(const struct sockaddr *sap,
socklen_t salen,
struct mount_options *options)
{
union nfs_sockaddr address;
struct sockaddr *my_addr = &address.sa;
socklen_t my_len = sizeof(address);
if (po_contains(options, "clientaddr") == PO_FOUND)
return 1;
nfs_callback_address(sap, salen, my_addr, &my_len);
return nfs_append_generic_address_option(my_addr, my_len,
"clientaddr", options);
}
