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/* Create a new trivfs control port
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "trivfs.h"
/* Create a new trivfs control port, with underlying node UNDERLYING, and
return it in CONTROL. CONTROL_CLASS & CONTROL_BUCKET are passed to
the ports library to create the control port, and PROTID_CLASS &
PROTID_BUCKET are used when creating ports representing opens of this
node. */
error_t
trivfs_create_control (mach_port_t underlying,
struct port_class *control_class,
struct port_bucket *control_bucket,
struct port_class *protid_class,
struct port_bucket *protid_bucket,
struct trivfs_control **control)
{
error_t err;
/* Perhaps allocate, and perhaps add the specified port classes the ones
recognized by trivfs. */
err = trivfs_add_control_port_class (&control_class);
if (! err)
err = trivfs_add_protid_port_class (&protid_class);
else
protid_class = 0;
/* Perhaps allocate new port buckets. */
if (! err)
err = trivfs_add_port_bucket (&control_bucket);
else
control_bucket = 0;
if (! err)
{
if (! protid_bucket)
/* By default, use the same port bucket for both. */
protid_bucket = control_bucket;
err = trivfs_add_port_bucket (&protid_bucket);
}
else
protid_bucket = 0;
if (! err)
err = ports_create_port (control_class, control_bucket,
sizeof (struct trivfs_control), control);
if (! err)
{
(*control)->underlying = underlying;
(*control)->protid_class = protid_class;
(*control)->protid_bucket = protid_bucket;
err = mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&(*control)->filesys_id);
if (err)
{
ports_port_deref (*control);
goto out;
}
err = mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&(*control)->file_id);
if (err)
{
mach_port_destroy (mach_task_self (), (*control)->filesys_id);
ports_port_deref (*control);
goto out;
}
(*control)->hook = 0;
mutex_init (&(*control)->lock);
}
out:
if (err)
{
trivfs_remove_control_port_class (control_class);
trivfs_remove_protid_port_class (protid_class);
trivfs_remove_port_bucket (control_bucket);
trivfs_remove_port_bucket (protid_bucket);
}
return err;
}
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