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/* diskfs_startup_diskfs -- advertise our fsys control port to our parent FS.
Copyright (C) 1994,95,96,98,99,2000,02 Free Software Foundation
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Roland McGrath. */
#include "priv.h"
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <error.h>
#include <hurd/fsys.h>
#include <hurd/startup.h>
#include <pids.h>
char *_diskfs_chroot_directory;
mach_port_t
diskfs_startup_diskfs (mach_port_t bootstrap, int flags)
{
error_t err;
mach_port_t realnode, right;
struct port_info *newpi;
if (_diskfs_chroot_directory != NULL)
{
/* The boot options requested we change to a subdirectory
and treat that as the root of the filesystem. */
struct node *np, *old;
struct protid *rootpi;
struct peropen *rootpo;
/* Skip leading slashes. */
while (*_diskfs_chroot_directory == '/')
++_diskfs_chroot_directory;
pthread_mutex_lock (&diskfs_root_node->lock);
/* Create a protid we can use in diskfs_lookup. */
err = diskfs_make_peropen (diskfs_root_node, O_READ|O_EXEC,
0, &rootpo);
assert_perror (err);
err = diskfs_create_protid (rootpo, 0, &rootpi);
assert_perror (err);
/* Look up the directory name. */
err = diskfs_lookup (diskfs_root_node, _diskfs_chroot_directory,
LOOKUP, &np, NULL, rootpi);
pthread_mutex_unlock (&diskfs_root_node->lock);
ports_port_deref (rootpi);
if (err == EAGAIN)
error (1, 0, "`--virtual-root=%s' specifies the real root directory",
_diskfs_chroot_directory);
else if (err)
error (1, err, "`%s' not found", _diskfs_chroot_directory);
if (!S_ISDIR (np->dn_stat.st_mode))
{
pthread_mutex_unlock (&np->lock);
error (1, ENOTDIR, "%s", _diskfs_chroot_directory);
}
/* Install this node as the new root, forgetting about the real root
node. The last essential piece that makes the virtual root work
is in fsys-getroot.c, which sets the first peropen's shadow_root
if _diskfs_chroot_directory is non-null. */
old = diskfs_root_node;
diskfs_root_node = np;
pthread_mutex_unlock (&np->lock);
diskfs_nput (old);
}
if (bootstrap != MACH_PORT_NULL)
{
err = ports_create_port (diskfs_control_class, diskfs_port_bucket,
sizeof (struct port_info), &newpi);
if (! err)
{
right = ports_get_send_right (newpi);
err = fsys_startup (bootstrap, flags, right,
MACH_MSG_TYPE_COPY_SEND, &realnode);
mach_port_deallocate (mach_task_self (), right);
ports_port_deref (newpi);
}
if (err)
error (1, err, "Translator startup failure: fsys_startup");
mach_port_deallocate (mach_task_self (), bootstrap);
_diskfs_ncontrol_ports++;
_diskfs_init_completed ();
}
else
{
realnode = MACH_PORT_NULL;
/* We are the bootstrap filesystem; do special boot-time setup. */
diskfs_start_bootstrap ();
}
if (diskfs_default_sync_interval)
/* Start 'em sync'n */
diskfs_set_sync_interval (diskfs_default_sync_interval);
return realnode;
}
error_t
diskfs_S_startup_dosync (mach_port_t handle)
{
error_t err = 0;
struct port_info *pi
= ports_lookup_port (diskfs_port_bucket, handle,
diskfs_shutdown_notification_class);
if (!pi)
return EOPNOTSUPP;
if (! diskfs_readonly)
{
/* First start a sync so that if something goes wrong
we at least get this much done. */
diskfs_sync_everything (0);
diskfs_set_hypermetadata (0, 0);
pthread_rwlock_wrlock (&diskfs_fsys_lock);
/* Permit all the current RPC's to finish, and then suspend new ones */
err = ports_inhibit_class_rpcs (diskfs_protid_class);
if (! err)
{
diskfs_sync_everything (1);
diskfs_set_hypermetadata (1, 1);
_diskfs_diskdirty = 0;
/* XXX: if some application writes something after that, we will
* crash. That is still better than creating pending writes before
* poweroff, and thus fsck on next reboot.
*/
diskfs_readonly = 1;
diskfs_readonly_changed (1);
ports_resume_class_rpcs (diskfs_protid_class);
}
pthread_rwlock_unlock (&diskfs_fsys_lock);
}
ports_port_deref (pi);
return err;
}
/* This is called when we have an ordinary environment, complete
with proc and auth ports. */
void
_diskfs_init_completed ()
{
startup_t init;
process_t proc;
error_t err;
struct port_info *pi;
mach_port_t notify;
char *name;
/* Contact the startup server and register our shutdown request.
If we get an error, print an informational message. */
proc = getproc ();
assert (proc);
err = ports_create_port (diskfs_shutdown_notification_class,
diskfs_port_bucket, sizeof (struct port_info),
&pi);
if (err)
goto errout;
err = proc_getmsgport (proc, HURD_PID_STARTUP, &init);
mach_port_deallocate (mach_task_self (), proc);
if (err)
goto errout;
notify = ports_get_send_right (pi);
ports_port_deref (pi);
asprintf (&name,
"%s %s", program_invocation_short_name, diskfs_disk_name ?: "-");
err = startup_request_notification (init, notify,
MACH_MSG_TYPE_COPY_SEND, name);
mach_port_deallocate (mach_task_self (), notify);
free (name);
if (err)
goto errout;
mach_port_deallocate (mach_task_self (), init);
return;
errout:
error (0, err, "Cannot request shutdown notification");
}
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