struct vnode *
getsynthvnode(const char *devname)
{
struct vnode *vp;
struct nchandle nch;
struct nlookupdata nd;
struct ucred *cred = proc0.p_ucred;
int error;
KKASSERT(synth_inited != 0);
KKASSERT(synth_mp != NULL);
KKASSERT(synth_mp->mnt_ncmountpt.mount != NULL);
/* Sync devfs/disks twice to make sure all devices are around */
if (synth_synced < 2) {
sync_devs();
++synth_synced;
}
error = nlookup_init_root(&nd,
devname, UIO_SYSSPACE, NLC_FOLLOW,
cred, &synth_mp->mnt_ncmountpt,
&synth_mp->mnt_ncmountpt);
if (error) {
panic("synth: nlookup_init_root failed with %d", error);
/* NOTREACHED */
}
error = nlookup(&nd);
if (error == 0) {
if (nd.nl_nch.ncp->nc_vp == NULL) {
kprintf("synth: nc_vp == NULL\n");
return (NULL);
}
nch = nd.nl_nch;
cache_zero(&nd.nl_nch);
}
nlookup_done(&nd);
if (error) {
if (error != ENOENT) { /* Don't bother warning about ENOENT */
kprintf("synth: nlookup of %s failed with %d\n",
devname, error);
}
return (NULL);
}
vp = nch.ncp->nc_vp;
/* A VX locked & refd vnode must be returned. */
error = vget(vp, LK_EXCLUSIVE);
cache_unlock(&nch);
if (error) {
kprintf("synth: could not vget vnode\n");
return (NULL);
}
return (vp);
}
static void
dump_conf(void *dummy)
{
char *path;
cdev_t dev;
path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK);
if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
sync_devs();
dev = kgetdiskbyname(path);
if (dev != NULL)
dumpdev = dev;
}
kfree(path, M_TEMP);
if (setdumpdev(dumpdev) != 0)
dumpdev = NULL;
}
/*
* Find and mount the root filesystem
*/
static void
vfs_mountroot(void *junk)
{
cdev_t save_rootdev = rootdev;
int i;
int dummy;
/*
* Make sure all disk devices created so far have also been probed,
* and also make sure that the newly created device nodes for
* probed disks are ready, too.
*
* Messages can fly around here so get good synchronization
* coverage.
*
* XXX - Delay an additional 2 seconds to help drivers which pickup
* devices asynchronously and are not caught by CAM's initial
* probe.
*/
sync_devs();
tsleep(&dummy, 0, "syncer", hz*2);
/*
* The root filesystem information is compiled in, and we are
* booted with instructions to use it.
*/
#ifdef ROOTDEVNAME
if ((boothowto & RB_DFLTROOT) &&
!vfs_mountroot_try(ROOTDEVNAME))
return;
#endif
/*
* We are booted with instructions to prompt for the root filesystem,
* or to use the compiled-in default when it doesn't exist.
*/
if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) {
if (!vfs_mountroot_ask())
return;
}
/*
* We've been given the generic "use CDROM as root" flag. This is
* necessary because one media may be used in many different
* devices, so we need to search for them.
*/
if (boothowto & RB_CDROM) {
for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
return;
}
}
/*
* Try to use the value read by the loader from /etc/fstab, or
* supplied via some other means. This is the preferred
* mechanism.
*/
if (!vfs_mountroot_try(kgetenv("vfs.root.mountfrom")))
return;
/*
* If a vfs set rootdev, try it (XXX VINUM HACK!)
*/
if (save_rootdev != NULL) {
rootdev = save_rootdev;
if (!vfs_mountroot_try(""))
return;
}
/*
* Try values that may have been computed by the machine-dependant
* legacy code.
*/
if (rootdevnames[0] && !vfs_mountroot_try(rootdevnames[0]))
return;
if (rootdevnames[1] && !vfs_mountroot_try(rootdevnames[1]))
return;
/*
* If we have a compiled-in default, and haven't already tried it, try
* it now.
*/
#ifdef ROOTDEVNAME
if (!(boothowto & RB_DFLTROOT))
if (!vfs_mountroot_try(ROOTDEVNAME))
return;
#endif
/*
* Everything so far has failed, prompt on the console if we haven't
* already tried that.
*/
if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask())
return;
panic("Root mount failed, startup aborted.");
}