int
kadmin(int cmd, int fcn, void *mdep, cred_t *credp)
{
int error = 0;
char *buf;
size_t buflen = 0;
boolean_t invoke_cb = B_FALSE;
/*
* We might be called directly by the kernel's fault-handling code, so
* we can't assert that the caller is in the global zone.
*/
/*
* Make sure that cmd is one of the valid <sys/uadmin.h> command codes
* and that we have appropriate privileges for this action.
*/
switch (cmd) {
case A_FTRACE:
case A_SHUTDOWN:
case A_REBOOT:
case A_REMOUNT:
case A_FREEZE:
case A_DUMP:
case A_SDTTEST:
case A_CONFIG:
if (secpolicy_sys_config(credp, B_FALSE) != 0)
return (EPERM);
break;
default:
return (EINVAL);
}
/*
* Serialize these operations on ualock. If it is held, the
* system should shutdown, reboot, or remount shortly, unless there is
* an error. We need a cv rather than just a mutex because proper
* functioning of A_REBOOT relies on being able to interrupt blocked
* userland callers.
*
* We only clear ua_shutdown_thread after A_REMOUNT or A_CONFIG.
* Other commands should never return.
*/
if (cmd == A_SHUTDOWN || cmd == A_REBOOT || cmd == A_REMOUNT ||
cmd == A_CONFIG) {
mutex_enter(&ualock);
while (ua_shutdown_thread != NULL) {
if (cv_wait_sig(&uacond, &ualock) == 0) {
/*
* If we were interrupted, leave, and handle
* the signal (or exit, depending on what
* happened)
*/
mutex_exit(&ualock);
return (EINTR);
}
}
ua_shutdown_thread = curthread;
mutex_exit(&ualock);
}
switch (cmd) {
case A_SHUTDOWN:
{
proc_t *p = ttoproc(curthread);
/*
* Release (almost) all of our own resources if we are called
* from a user context, however if we are calling kadmin() from
* a kernel context then we do not release these resources.
*/
if (p != &p0) {
proc_is_exiting(p);
if ((error = exitlwps(0)) != 0) {
/*
* Another thread in this process also called
* exitlwps().
*/
mutex_enter(&ualock);
ua_shutdown_thread = NULL;
cv_signal(&uacond);
mutex_exit(&ualock);
return (error);
}
mutex_enter(&p->p_lock);
p->p_flag |= SNOWAIT;
sigfillset(&p->p_ignore);
curthread->t_lwp->lwp_cursig = 0;
curthread->t_lwp->lwp_extsig = 0;
if (p->p_exec) {
vnode_t *exec_vp = p->p_exec;
p->p_exec = NULLVP;
mutex_exit(&p->p_lock);
VN_RELE(exec_vp);
} else {
mutex_exit(&p->p_lock);
}
pollcleanup();
closeall(P_FINFO(curproc));
relvm();
} else {
/*
* Reset t_cred if not set because much of the
* filesystem code depends on CRED() being valid.
*/
if (curthread->t_cred == NULL)
curthread->t_cred = kcred;
}
/* indicate shutdown in progress */
sys_shutdown = 1;
/*
* Communcate that init shouldn't be restarted.
*/
zone_shutdown_global();
killall(ALL_ZONES);
/*
* If we are calling kadmin() from a kernel context then we
* do not release these resources.
*/
if (ttoproc(curthread) != &p0) {
VN_RELE(PTOU(curproc)->u_cdir);
if (PTOU(curproc)->u_rdir)
VN_RELE(PTOU(curproc)->u_rdir);
if (PTOU(curproc)->u_cwd)
refstr_rele(PTOU(curproc)->u_cwd);
PTOU(curproc)->u_cdir = rootdir;
PTOU(curproc)->u_rdir = NULL;
PTOU(curproc)->u_cwd = NULL;
}
/*
* Allow the reboot/halt/poweroff code a chance to do
* anything it needs to whilst we still have filesystems
* mounted, like loading any modules necessary for later
* performing the actual poweroff.
*/
if ((mdep != NULL) && (*(char *)mdep == '/')) {
buf = i_convert_boot_device_name(mdep, NULL, &buflen);
mdpreboot(cmd, fcn, buf);
} else
mdpreboot(cmd, fcn, mdep);
/*
* Allow fsflush to finish running and then prevent it
* from ever running again so that vfs_unmountall() and
* vfs_syncall() can acquire the vfs locks they need.
*/
sema_p(&fsflush_sema);
(void) callb_execute_class(CB_CL_UADMIN_PRE_VFS, NULL);
vfs_unmountall();
(void) VFS_MOUNTROOT(rootvfs, ROOT_UNMOUNT);
vfs_syncall();
dump_ereports();
dump_messages();
invoke_cb = B_TRUE;
/* FALLTHROUGH */
}
case A_REBOOT:
if ((mdep != NULL) && (*(char *)mdep == '/')) {
buf = i_convert_boot_device_name(mdep, NULL, &buflen);
mdboot(cmd, fcn, buf, invoke_cb);
} else
mdboot(cmd, fcn, mdep, invoke_cb);
/* no return expected */
break;
case A_CONFIG:
switch (fcn) {
case AD_UPDATE_BOOT_CONFIG:
#ifndef __sparc
{
extern void fastboot_update_config(const char *);
fastboot_update_config(mdep);
}
#endif
break;
}
/* Let other threads enter the shutdown path now */
mutex_enter(&ualock);
ua_shutdown_thread = NULL;
cv_signal(&uacond);
mutex_exit(&ualock);
break;
case A_REMOUNT:
(void) VFS_MOUNTROOT(rootvfs, ROOT_REMOUNT);
/* Let other threads enter the shutdown path now */
mutex_enter(&ualock);
ua_shutdown_thread = NULL;
cv_signal(&uacond);
mutex_exit(&ualock);
break;
case A_FREEZE:
{
/*
* This is the entrypoint for all suspend/resume actions.
*/
extern int cpr(int, void *);
if (modload("misc", "cpr") == -1)
return (ENOTSUP);
/* Let the CPR module decide what to do with mdep */
error = cpr(fcn, mdep);
break;
}
case A_FTRACE:
{
switch (fcn) {
case AD_FTRACE_START:
(void) FTRACE_START();
break;
case AD_FTRACE_STOP:
(void) FTRACE_STOP();
break;
default:
error = EINVAL;
}
break;
}
case A_DUMP:
{
if (fcn == AD_NOSYNC) {
in_sync = 1;
break;
}
panic_bootfcn = fcn;
panic_forced = 1;
if ((mdep != NULL) && (*(char *)mdep == '/')) {
panic_bootstr = i_convert_boot_device_name(mdep,
NULL, &buflen);
} else
panic_bootstr = mdep;
#ifndef __sparc
extern void fastboot_update_and_load(int, char *);
fastboot_update_and_load(fcn, mdep);
#endif
panic("forced crash dump initiated at user request");
/*NOTREACHED*/
}
case A_SDTTEST:
{
DTRACE_PROBE7(test, int, 1, int, 2, int, 3, int, 4, int, 5,
int, 6, int, 7);
break;
}
default:
error = EINVAL;
}
return (error);
}
/*
* Configure root file system.
*/
int
rootconf(void)
{
int error;
struct vfssw *vsw;
extern void pm_init(void);
BMDPRINTF(("rootconf: fstype %s\n", rootfs.bo_fstype));
BMDPRINTF(("rootconf: name %s\n", rootfs.bo_name));
BMDPRINTF(("rootconf: flags 0x%x\n", rootfs.bo_flags));
BMDPRINTF(("rootconf: obp_bootpath %s\n", obp_bootpath));
/*
* Install cluster modules that were only loaded during
* loadrootmodules().
*/
if (error = clboot_rootconf())
return (error);
if (root_is_svm) {
(void) strncpy(rootfs.bo_name, obp_bootpath, BO_MAXOBJNAME);
BMDPRINTF(("rootconf: svm: rootfs name %s\n", rootfs.bo_name));
BMDPRINTF(("rootconf: svm: svm name %s\n", svm_bootpath));
}
/*
* Run _init on the root filesystem (we already loaded it
* but we've been waiting until now to _init it) which will
* have the side-effect of running vsw_init() on this vfs.
* Because all the nfs filesystems are lumped into one
* module we need to special case it.
*/
if (strncmp(rootfs.bo_fstype, "nfs", 3) == 0) {
if (modload("fs", "nfs") == -1) {
cmn_err(CE_CONT, "Cannot initialize %s filesystem\n",
rootfs.bo_fstype);
return (ENXIO);
}
} else {
if (modload("fs", rootfs.bo_fstype) == -1) {
cmn_err(CE_CONT, "Cannot initialize %s filesystem\n",
rootfs.bo_fstype);
return (ENXIO);
}
}
RLOCK_VFSSW();
vsw = vfs_getvfsswbyname(rootfs.bo_fstype);
RUNLOCK_VFSSW();
VFS_INIT(rootvfs, &vsw->vsw_vfsops, (caddr_t)0);
VFS_HOLD(rootvfs);
if (root_is_svm) {
rootvfs->vfs_flag |= VFS_RDONLY;
}
/*
* This pm-releated call has to occur before root is mounted since we
* need to power up all devices. It is placed after VFS_INIT() such
* that opening a device via ddi_lyr_ interface just before root has
* been mounted would work.
*/
pm_init();
if (netboot) {
if ((error = strplumb()) != 0) {
cmn_err(CE_CONT, "Cannot plumb network device\n");
return (error);
}
}
/*
* ufs_mountroot() ends up calling getrootdev()
* (below) which actually triggers the _init, identify,
* probe and attach of the drivers that make up root device
* bush; these are also quietly waiting in memory.
*/
BMDPRINTF(("rootconf: calling VFS_MOUNTROOT %s\n", rootfs.bo_fstype));
error = VFS_MOUNTROOT(rootvfs, ROOT_INIT);
vfs_unrefvfssw(vsw);
rootdev = rootvfs->vfs_dev;
if (error)
cmn_err(CE_CONT, "Cannot mount root on %s fstype %s\n",
rootfs.bo_name, rootfs.bo_fstype);
else
cmn_err(CE_CONT, "?root on %s fstype %s\n",
rootfs.bo_name, rootfs.bo_fstype);
return (error);
}
