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/*
Copyright (C) 1994, 1995, 1996 Free Software Foundation
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. */
#ifndef __TRIVFS_H__
#define __TRIVFS_H__
#include <errno.h>
#include <cthreads.h> /* for mutexes &c */
#include <sys/types.h> /* for uid_t &c */
#include <mach/mach.h>
#include <hurd/ports.h>
struct trivfs_protid
{
struct port_info pi;
uid_t *uids, *gids;
int nuids, ngids;
int isroot;
/* REALNODE will be null if this protid wasn't fully created (currently
only in the case where trivfs_protid_create_hook returns an error). */
mach_port_t realnode; /* restricted permissions */
void *hook; /* for user use */
struct trivfs_peropen *po;
};
/* These can be used as `intran' and `destructor' functions for
a MiG port type, to have the stubs called with the protid pointer. */
struct trivfs_protid *trivfs_begin_using_protid (mach_port_t);
void trivfs_end_using_protid (struct trivfs_protid *);
struct trivfs_peropen
{
void *hook; /* for user use */
int openmodes;
int refcnt;
struct trivfs_control *cntl;
};
struct trivfs_control
{
struct port_info pi;
struct mutex lock;
struct port_class *protid_class;
struct port_bucket *protid_bucket;
mach_port_t filesys_id;
mach_port_t file_id;
mach_port_t underlying;
void *hook; /* for user use */
};
/* These can be used as `intran' and `destructor' functions for
a MiG port type, to have the stubs called with the control pointer. */
struct trivfs_control *trivfs_begin_using_control (mach_port_t);
void trivfs_end_using_control (struct trivfs_control *);
/* The user must define these variables. */
extern int trivfs_fstype;
extern int trivfs_fsid;
/* Set these if trivfs should allow read, write,
or execute of file. */
extern int trivfs_support_read;
extern int trivfs_support_write;
extern int trivfs_support_exec;
/* Set this some combination of O_READ, O_WRITE, and O_EXEC;
trivfs will only allow opens of the specified modes.
(trivfs_support_* is not used to validate opens, only actual
operations.) */
extern int trivfs_allow_open;
extern struct port_class *trivfs_protid_portclasses[];
extern int trivfs_protid_nportclasses;
extern struct port_class *trivfs_cntl_portclasses[];
extern int trivfs_cntl_nportclasses;
/* The user must define this function. This should modify a struct
stat (as returned from the underlying node) for presentation to
callers of io_stat. It is permissable for this function to do
nothing. */
void trivfs_modify_stat (struct trivfs_protid *cred, struct stat *);
/* If this variable is set, it is called every time an open happens.
UIDS, GIDS, and FLAGS are from the open; CNTL identifies the
node being opened. This call need not check permissions on the underlying
node. This call can block as necessary, unless O_NONBLOCK is set
in FLAGS. Any desired error can be returned, which will be reflected
to the user and prevent the open from succeeding. */
error_t (*trivfs_check_open_hook) (struct trivfs_control *cntl,
uid_t *uids, u_int nuids,
gid_t *gids, u_int ngids,
int flags);
/* If this variable is set, it is called every time a new protid
structure is created and initialized. */
error_t (*trivfs_protid_create_hook) (struct trivfs_protid *);
/* If this variable is set, it is called every time a new peropen
structure is created and initialized. */
error_t (*trivfs_peropen_create_hook) (struct trivfs_peropen *);
/* If this variable is set, it is called every time a protid structure
is about to be destroyed. */
void (*trivfs_protid_destroy_hook) (struct trivfs_protid *);
/* If this variable is set, it is called every time a peropen structure
is about to be destroyed. */
void (*trivfs_peropen_destroy_hook) (struct trivfs_peropen *);
/* Creates a control port for this filesystem and sends it to BOOTSTRAP with
fsys_startup. 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. If CONTROL
isn't NULL, the trivfs control port is return in it. If any error occurs
sending fsys_startup, it is returned, otherwise 0. FLAGS specifies how to
open the underlying node (O_*). */
error_t trivfs_startup (mach_port_t bootstrap, int flags,
struct port_class *control_class,
struct port_bucket *control_bucket,
struct port_class *protid_class,
struct port_bucket *protid_bucket,
struct trivfs_control **control);
/* 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);
/* Install these as libports cleanroutines for trivfs_protid_class
and trivfs_cntl_class respectively. */
void trivfs_clean_protid (void *);
void trivfs_clean_cntl (void *);
/* This demultiplees messages for trivfs ports. */
int trivfs_demuxer (mach_msg_header_t *, mach_msg_header_t *);
/* Return a new protid pointing to a new peropen in CRED, with REALNODE as
the underlying node reference, with the given identity, and open flags in
FLAGS. CNTL is the trivfs control object. */
error_t trivfs_open (struct trivfs_control *fsys,
uid_t *uids, unsigned num_uids,
gid_t *gids, unsigned num_gids,
unsigned flags,
mach_port_t realnode,
struct trivfs_protid **cred);
/* Return a duplicate of CRED in DUP, sharing the same peropen and hook. A
non-null hook may be used to detect that this is a duplicate by
trivfs_peropen_create_hook. */
error_t trivfs_protid_dup (struct trivfs_protid *cred,
struct trivfs_protid **dup);
/* The user must define this function. Someone wants the filesystem
CNTL to go away. FLAGS are from the set FSYS_GOAWAY_*. */
error_t trivfs_goaway (struct trivfs_control *cntl, int flags);
/* Call this to set atime for the node to the current time. */
error_t trivfs_set_atime (struct trivfs_control *cntl);
/* Call this to set mtime for the node to the current time. */
error_t trivfs_set_mtime (struct trivfs_control *cntl);
#endif /* __TRIVFS_H__ */
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