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/*
Copyright (C) 2018 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. If not, see <<a rel="nofollow" href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
*/
/* ACPI Filesystem header */
#ifndef ACPIFS_H
#define ACPIFS_H
#include <hurd/netfs.h>
#include <pthread.h>
#include <maptime.h>
#include <netfs_impl.h>
#include <acpi.h>
/* Size of a directory entry name */
#ifndef NAME_SIZE
#define NAME_SIZE 8
#endif
/* Node cache defaults size */
#define NODE_CACHE_MAX 16
/*
* User and group ids to grant permission to acpi
*/
struct acpifs_perm
{
int32_t uid;
int32_t gid;
};
/*
* Directory entry.
*
* All directory entries are created on startup and used to generate the
* fs tree and create or retrieve libnetfs node objects.
*
* From libnetfs' point of view, these are the light nodes.
*/
struct acpifs_dirent
{
char name[NAME_SIZE];
struct acpifs_dirent *parent;
io_statbuf_t stat;
/*
* We only need two kind of nodes: files and directories.
* When `dir' is null, this is a file; when not null, it's a directory.
*/
struct acpifs_dir *dir;
/* Active node on this entry */
struct node *node;
/* ACPI table related to an entry */
struct acpi_table *acpitable;
};
/*
* A directory, it only contains a list of directory entries
*/
struct acpifs_dir
{
/* Number of directory entries */
uint16_t num_entries;
/* Array of directory entries */
struct acpifs_dirent **entries;
};
/* A particular ACPI filesystem. */
struct acpifs
{
/* Root of filesystem. */
struct node *root;
/* A cache that holds a reference to recently used nodes. */
struct node *node_cache_mru, *node_cache_lru;
size_t node_cache_len; /* Number of entries in it. */
size_t node_cache_max;
pthread_mutex_t node_cache_lock;
struct acpifs_perm perm;
struct acpifs_dirent *entries;
size_t num_entries;
};
/* Main FS pointer */
extern struct acpifs *fs;
/* Global mapped time */
extern volatile struct mapped_time_value *acpifs_maptime;
/* Update entry and node times */
#define UPDATE_TIMES(e, what) (\
{\
fshelp_touch (&e->stat, what, acpifs_maptime);\
if(e->node)\
fshelp_touch (&e->node->nn_stat, what, acpifs_maptime);\
}\
)
/* Update entry and node owner */
#define UPDATE_OWNER(e, uid) (\
{\
e->stat.st_uid = uid;\
if(e->node)\
e->node->nn_stat.st_uid = uid;\
}\
)
/* Update entry and node group */
#define UPDATE_GROUP(e, gid) (\
{\
e->stat.st_gid = gid;\
if(e->node)\
e->node->nn_stat.st_gid = gid;\
}\
)
/* FS manipulation functions */
error_t alloc_file_system (struct acpifs **fs);
error_t init_file_system (file_t underlying_node, struct acpifs *fs);
error_t create_fs_tree (struct acpifs *fs);
error_t fs_set_permissions (struct acpifs *fs);
error_t entry_check_perms (struct iouser *user, struct acpifs_dirent *e,
int flags);
#endif /* ACPIFS_H */
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