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/*
Copyright (C) 1993, 1994, 1995 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 Michael I. Bushnell. */
#include "priv.h"
#include <hurd/fsys.h>
struct mutex diskfs_shutdown_lock = MUTEX_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);
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;
}
mutex_lock (&diskfs_shutdown_lock);
/* Permit all the current RPC's to finish, and then
suspend new ones. */
ports_inhibit_class_rpcs (diskfs_protid_class);
/* Unfortunately, we can't inhibit control ports, because
we are running inside a control port RPC. What to do?
ports_count_class will prevent new protid's from being created;
that will happily block getroot and getfile. diskfs_shutdown_lock
will block simultaneous attempts at goaway and set_options. Only
syncfs remains; perhaps a special flag could be used, or it could
also hold diskfs_shutdown_lock (which should probably then be
renamed...). */
/* 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);
mutex_unlock (&diskfs_shutdown_lock);
return EBUSY;
}
if (flags & FSYS_GOAWAY_NOSYNC == 0)
{
diskfs_shutdown_pager ();
diskfs_set_hypermetadata (1, 1);
}
return 0;
}
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