/*
* Returns the RPC version number specified by the given mount options,
* or the version "3" if all fails.
*/
static rpcvers_t nfs_mount_version(struct mount_options *options)
{
long tmp;
if (po_get_numeric(options, "mountvers", &tmp) == PO_FOUND)
if (tmp >= 1 && tmp <= 4)
return tmp;
return nfsvers_to_mnt(nfs_nfs_version(options));
}
/**
* nfs_options2pmap - set up pmap structs based on mount options
* @options: pointer to mount options
* @nfs_pmap: OUT: pointer to pmap arguments for NFS server
* @mnt_pmap: OUT: pointer to pmap arguments for mountd server
*
*/
void nfs_options2pmap(struct mount_options *options,
struct pmap *nfs_pmap, struct pmap *mnt_pmap)
{
nfs_pmap->pm_prog = nfs_nfs_program(options);
nfs_pmap->pm_vers = nfs_nfs_version(options);
nfs_pmap->pm_prot = nfs_nfs_protocol(options);
nfs_pmap->pm_port = nfs_nfs_port(options);
mnt_pmap->pm_prog = nfs_mount_program(options);
mnt_pmap->pm_vers = nfs_mount_version(options);
mnt_pmap->pm_prot = nfs_mount_protocol(options);
mnt_pmap->pm_port = nfs_mount_port(options);
}
/*
* Returns the transport protocol to use for the mount service
*
* Returns the IPPROTO_ value specified by the mountproto option, or
* if that doesn't exist, the IPPROTO_ value specified for NFS
* itself.
*/
static unsigned short nfs_mount_protocol(struct mount_options *options)
{
char *option;
option = po_get(options, "mountproto");
if (option) {
if (strcmp(option, "tcp") == 0)
return IPPROTO_TCP;
if (strcmp(option, "udp") == 0)
return IPPROTO_UDP;
}
return nfs_nfs_version(options);
}
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;
}
