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/*
Copyright (C) 2017 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
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 <http://www.gnu.org/licenses/>.
*/
/* PCI Filesystem header */
#ifndef PCIFS_H
#define PCIFS_H
#include <hurd/netfs.h>
#include <pthread.h>
#include <maptime.h>
#include <pciaccess.h>
// FIXME: Hardcoded PCI config size
#define PCI_CONFIG_SIZE 256
#include <netfs_impl.h>
/* Size of a directory entry name */
#ifndef NAME_SIZE
#define NAME_SIZE 16
#endif
/* Node cache defaults size */
#define NODE_CACHE_MAX 16
/*
* Directory entry. Contains all per-node data our problem requires.
*
* 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 pcifs_dirent
{
/*
* Complete bus identification, including domain, of the device. On
* platforms that do not support PCI domains (e.g., 32-bit x86 hardware),
* the domain will always be zero.
*
* Negative value means no value.
*/
int32_t domain;
int16_t bus;
int16_t dev;
int8_t func;
/*
* Device's class, subclass, and programming interface packed into a
* single 32-bit value. The class is at bits [23:16], subclass is at
* bits [15:8], and programming interface is at [7:0].
*
* Negative value means no value.
*/
int32_t device_class;
char name[NAME_SIZE];
struct pcifs_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 pcifs_dir *dir;
/* Active node on this entry */
struct node *node;
/*
* Underlying virtual device if any.
*
* Only for entries having a full B/D/F address.
*/
struct pci_device *device;
};
/*
* A directory, it only contains a list of directory entries
*/
struct pcifs_dir
{
/* Number of directory entries */
uint16_t num_entries;
/* Array of directory entries */
struct pcifs_dirent **entries;
};
/*
* Set of permissions.
*
* For each Class[,subclass] and/or Domain[,bus[,dev[,func]]], one UID and/or GID.
*/
struct pcifs_perm
{
/*
* D/b/d/f scope of permissions.
*
* Negative value means no value.
*/
int32_t domain;
int16_t bus;
int16_t dev;
int8_t func;
/*
* Class and subclass scope of permissions
*
* Negative value means no value.
*/
int16_t d_class;
int16_t d_subclass;
/* User and group ids */
int32_t uid;
int32_t gid;
};
/* Various parameters that can be used to change the behavior of an ftpfs. */
struct pcifs_params
{
/* The size of the node cache. */
size_t node_cache_max;
/* FS permissions. */
struct pcifs_perm *perms;
size_t num_perms;
};
/* A particular filesystem. */
struct pcifs
{
/* Root of filesystem. */
struct node *root;
/* FS configuration */
struct pcifs_params params;
/* 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. */
pthread_mutex_t node_cache_lock;
/* Lock for pci_conf operations */
pthread_mutex_t pci_conf_lock;
struct pcifs_dirent *entries;
size_t num_entries;
};
/* Main FS pointer */
extern struct pcifs *fs;
/* Global mapped time */
extern volatile struct mapped_time_value *pcifs_maptime;
/* Update entry and node times */
#define UPDATE_TIMES(e, what) (\
{\
fshelp_touch (&e->stat, what, pcifs_maptime);\
if(e->node)\
fshelp_touch (&e->node->nn_stat, what, pcifs_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 pcifs **fs);
error_t init_file_system (file_t underlying_node, struct pcifs *fs);
error_t create_fs_tree (struct pcifs *fs);
error_t fs_set_permissions (struct pcifs *fs);
error_t entry_check_perms (struct iouser *user, struct pcifs_dirent *e,
int flags);
#endif /* PCIFS_H */
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