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/*
Copyright (C) 1993, 94, 95, 96, 98, 99 Free Software Foundation, Inc.
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 Michael I. Bushnell. */
#include "priv.h"
#include <hurd/fsys.h>
struct rwlock diskfs_fsys_lock = RWLOCK_INITIALIZER;
/* Shutdown the filesystem; flags are as for fsys_goaway. */
error_t
diskfs_shutdown (int flags)
{
int nports = -1;
int err;
error_t
helper (struct node *np)
{
error_t error;
mach_port_t control;
error = fshelp_fetch_control (&np->transbox, &control);
mutex_unlock (&np->lock);
if (!error && (control != MACH_PORT_NULL))
{
error = fsys_goaway (control, flags);
mach_port_deallocate (mach_task_self (), control);
}
else
error = 0;
mutex_lock (&np->lock);
if ((error == MIG_SERVER_DIED) || (error == MACH_SEND_INVALID_DEST))
error = 0;
return error;
}
if ((flags & FSYS_GOAWAY_UNLINK)
&& S_ISDIR (diskfs_root_node->dn_stat.st_mode))
return EBUSY;
if (flags & FSYS_GOAWAY_RECURSE)
{
err = diskfs_node_iterate (helper);
if (err)
return err;
}
rwlock_writer_lock (&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)
{
rwlock_writer_unlock (&diskfs_fsys_lock);
return err;
}
/* Write everything out and set "clean" state. Even if we don't in fact
shut down now, this has the nice effect that a disk that has not been
written for a long time will not need checking after a crash. */
diskfs_sync_everything (1);
diskfs_set_hypermetadata (1, 1);
_diskfs_diskdirty = 0;
/* First, see if there are outstanding user ports. */
nports = ports_count_class (diskfs_protid_class);
if (((flags & FSYS_GOAWAY_FORCE) == 0)
&& (nports || diskfs_pager_users ()))
{
ports_enable_class (diskfs_protid_class);
ports_resume_class_rpcs (diskfs_protid_class);
rwlock_writer_unlock (&diskfs_fsys_lock);
return EBUSY;
}
if (!diskfs_readonly && (flags & FSYS_GOAWAY_NOSYNC) == 0)
{
diskfs_shutdown_pager ();
diskfs_set_hypermetadata (1, 1);
}
return 0;
}
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