/*
* Mount a remote root fs via. nfs. This depends on the info in the
* nfs_diskless structure that has been filled in properly by some primary
* bootstrap.
* It goes something like this:
* - do enough of "ifconfig" by calling ifioctl() so that the system
* can talk to the server
* - If nfs_diskless.mygateway is filled in, use that address as
* a default gateway.
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
int
nfs_mountroot(struct mount *mp)
{
struct mount *swap_mp;
struct nfsv3_diskless *nd = &nfsv3_diskless;
struct socket *so;
struct vnode *vp;
struct thread *td = curthread; /* XXX */
int error, i;
u_long l;
char buf[128];
#if defined(BOOTP_NFSROOT) && defined(BOOTP)
bootpc_init(); /* use bootp to get nfs_diskless filled in */
#endif
/*
* XXX time must be non-zero when we init the interface or else
* the arp code will wedge...
*/
while (mycpu->gd_time_seconds == 0)
tsleep(mycpu, 0, "arpkludge", 10);
/*
* The boot code may have passed us a diskless structure.
*/
kprintf("DISKLESS %d\n", nfs_diskless_valid);
if (nfs_diskless_valid == 1)
nfs_convert_diskless();
/*
* NFSv3 is required.
*/
nd->root_args.flags |= NFSMNT_NFSV3 | NFSMNT_RDIRPLUS;
nd->swap_args.flags |= NFSMNT_NFSV3;
#define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr))
kprintf("nfs_mountroot: interface %s ip %s",
nd->myif.ifra_name,
inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr));
kprintf(" bcast %s",
inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr));
kprintf(" mask %s\n",
inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr));
#undef SINP
/*
* XXX splnet, so networks will receive...
*/
crit_enter();
/*
* BOOTP does not necessarily have to be compiled into the kernel
* for an NFS root to work. If we inherited the network
* configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured
* out our interface for us and all we need to do is ifconfig the
* interface. We only do this if the interface has not already been
* ifconfig'd by e.g. BOOTP.
*/
error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td);
if (error) {
panic("nfs_mountroot: socreate(%04x): %d",
nd->myif.ifra_addr.sa_family, error);
}
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred);
if (error)
panic("nfs_mountroot: SIOCAIFADDR: %d", error);
soclose(so, FNONBLOCK);
/*
* If the gateway field is filled in, set it as the default route.
*/
if (nd->mygateway.sin_len != 0) {
struct sockaddr_in mask, sin;
bzero((caddr_t)&mask, sizeof(mask));
sin = mask;
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
kprintf("nfs_mountroot: gateway %s\n",
inet_ntoa(nd->mygateway.sin_addr));
error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin,
(struct sockaddr *)&nd->mygateway,
(struct sockaddr *)&mask,
RTF_UP | RTF_GATEWAY);
if (error)
kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error);
}
/*
* Create the rootfs mount point.
*/
nd->root_args.fh = nd->root_fh;
nd->root_args.fhsize = nd->root_fhsize;
l = ntohl(nd->root_saddr.sin_addr.s_addr);
ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam);
kprintf("NFS_ROOT: %s\n",buf);
error = nfs_mountdiskless(buf, "/", MNT_RDONLY, &nd->root_saddr,
&nd->root_args, td, &vp, &mp);
if (error) {
mp->mnt_vfc->vfc_refcount--;
crit_exit();
return (error);
}
swap_mp = NULL;
if (nd->swap_nblks) {
/* Convert to DEV_BSIZE instead of Kilobyte */
nd->swap_nblks *= 2;
/*
* Create a fake mount point just for the swap vnode so that the
* swap file can be on a different server from the rootfs.
*/
nd->swap_args.fh = nd->swap_fh;
nd->swap_args.fhsize = nd->swap_fhsize;
l = ntohl(nd->swap_saddr.sin_addr.s_addr);
ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam);
kprintf("NFS SWAP: %s\n",buf);
error = nfs_mountdiskless(buf, "/swap", 0, &nd->swap_saddr,
&nd->swap_args, td, &vp, &swap_mp);
if (error) {
crit_exit();
return (error);
}
vfs_unbusy(swap_mp);
VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size =
nd->swap_nblks * DEV_BSIZE ;
/*
* Since the swap file is not the root dir of a file system,
* hack it to a regular file.
*/
vclrflags(vp, VROOT);
vref(vp);
nfs_setvtype(vp, VREG);
swaponvp(td, vp, nd->swap_nblks);
}
/*
* Mount a remote root fs via. nfs. This depends on the info in the
* nfs_diskless structure that has been filled in properly by some primary
* bootstrap.
* It goes something like this:
* - do enough of "ifconfig" by calling ifioctl() so that the system
* can talk to the server
* - If nfs_diskless.mygateway is filled in, use that address as
* a default gateway.
* - build the rootfs mount point and call mountnfs() to do the rest.
*
* It is assumed to be safe to read, modify, and write the nfsv3_diskless
* structure, as well as other global NFS client variables here, as
* nfs_mountroot() will be called once in the boot before any other NFS
* client activity occurs.
*/
int
nfs_mountroot(struct mount *mp)
{
struct thread *td = curthread;
struct nfsv3_diskless *nd = &nfsv3_diskless;
struct socket *so;
struct vnode *vp;
struct ifreq ir;
int error;
u_long l;
char buf[128];
char *cp;
#if defined(BOOTP_NFSROOT) && defined(BOOTP)
bootpc_init(); /* use bootp to get nfs_diskless filled in */
#elif defined(NFS_ROOT)
nfs_setup_diskless();
#endif
if (nfs_diskless_valid == 0) {
return (-1);
}
if (nfs_diskless_valid == 1)
nfs_convert_diskless();
/*
* XXX splnet, so networks will receive...
*/
splnet();
/*
* Do enough of ifconfig(8) so that the critical net interface can
* talk to the server.
*/
error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
td->td_ucred, td);
if (error)
panic("nfs_mountroot: socreate(%04x): %d",
nd->myif.ifra_addr.sa_family, error);
#if 0 /* XXX Bad idea */
/*
* We might not have been told the right interface, so we pass
* over the first ten interfaces of the same kind, until we get
* one of them configured.
*/
for (i = strlen(nd->myif.ifra_name) - 1;
nd->myif.ifra_name[i] >= '0' &&
nd->myif.ifra_name[i] <= '9';
nd->myif.ifra_name[i] ++) {
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
if(!error)
break;
}
#endif
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
if (error)
panic("nfs_mountroot: SIOCAIFADDR: %d", error);
if ((cp = getenv("boot.netif.mtu")) != NULL) {
ir.ifr_mtu = strtol(cp, NULL, 10);
bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
freeenv(cp);
error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
if (error)
printf("nfs_mountroot: SIOCSIFMTU: %d", error);
}
soclose(so);
/*
* If the gateway field is filled in, set it as the default route.
* Note that pxeboot will set a default route of 0 if the route
* is not set by the DHCP server. Check also for a value of 0
* to avoid panicking inappropriately in that situation.
*/
if (nd->mygateway.sin_len != 0 &&
nd->mygateway.sin_addr.s_addr != 0) {
struct sockaddr_in mask, sin;
bzero((caddr_t)&mask, sizeof(mask));
sin = mask;
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
/* XXX MRT use table 0 for this sort of thing */
CURVNET_SET(TD_TO_VNET(td));
error = rtrequest_fib(RTM_ADD, (struct sockaddr *)&sin,
(struct sockaddr *)&nd->mygateway,
(struct sockaddr *)&mask,
RTF_UP | RTF_GATEWAY, NULL, RT_DEFAULT_FIB);
CURVNET_RESTORE();
if (error)
panic("nfs_mountroot: RTM_ADD: %d", error);
}
/*
* Create the rootfs mount point.
*/
nd->root_args.fh = nd->root_fh;
nd->root_args.fhsize = nd->root_fhsize;
l = ntohl(nd->root_saddr.sin_addr.s_addr);
snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff, nd->root_hostnam);
printf("NFS ROOT: %s\n", buf);
nd->root_args.hostname = buf;
if ((error = nfs_mountdiskless(buf,
&nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
return (error);
}
/*
* This is not really an nfs issue, but it is much easier to
* set hostname here and then let the "/etc/rc.xxx" files
* mount the right /var based upon its preset value.
*/
mtx_lock(&prison0.pr_mtx);
strlcpy(prison0.pr_hostname, nd->my_hostnam,
sizeof (prison0.pr_hostname));
mtx_unlock(&prison0.pr_mtx);
inittodr(ntohl(nd->root_time));
return (0);
}
