source: mainline/uspace/srv/vfs/vfs.h@ 286286c

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 286286c was 4979403, checked in by Jakub Jermar <jakub@…>, 14 years ago

Allow more instances of the same FS to be used.
(Thanks to Maurizio Lombardi.)
  • Property mode set to 100644
File size: 6.6 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33#ifndef VFS_VFS_H_
34#define VFS_VFS_H_
35
36#include <async.h>
37#include <adt/list.h>
38#include <fibril_synch.h>
39#include <sys/types.h>
40#include <loc.h>
41#include <bool.h>
42#include <ipc/vfs.h>
43#include <task.h>
44
45#ifndef dprintf
46 #define dprintf(...)
47#endif
48
49/**
50 * A structure like this will be allocated for each registered file system.
51 */
52typedef struct {
53 link_t fs_link;
54 vfs_info_t vfs_info;
55 fs_handle_t fs_handle;
56 async_sess_t *sess;
57} fs_info_t;
58
59/**
60 * VFS_PAIR uniquely represents a file system instance.
61 */
62#define VFS_PAIR \
63 fs_handle_t fs_handle; \
64 service_id_t service_id;
65
66/**
67 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
68 * doesn't contain any state. For a stateful structure, see vfs_node_t.
69 *
70 * @note fs_handle, service_id and index are meant to be returned in one
71 * IPC reply.
72 */
73#define VFS_TRIPLET \
74 VFS_PAIR; \
75 fs_index_t index;
76
77typedef struct {
78 VFS_PAIR;
79} vfs_pair_t;
80
81typedef struct {
82 VFS_TRIPLET;
83} vfs_triplet_t;
84
85typedef enum vfs_node_type {
86 VFS_NODE_UNKNOWN,
87 VFS_NODE_FILE,
88 VFS_NODE_DIRECTORY,
89} vfs_node_type_t;
90
91typedef struct {
92 vfs_triplet_t triplet;
93 vfs_node_type_t type;
94 aoff64_t size;
95 unsigned int lnkcnt;
96} vfs_lookup_res_t;
97
98/**
99 * Instances of this type represent an active, in-memory VFS node and any state
100 * which may be associated with it.
101 */
102typedef struct {
103 VFS_TRIPLET; /**< Identity of the node. */
104
105 /**
106 * Usage counter. This includes, but is not limited to, all vfs_file_t
107 * structures that reference this node.
108 */
109 unsigned refcnt;
110
111 /** Number of names this node has in the file system namespace. */
112 unsigned lnkcnt;
113
114 link_t nh_link; /**< Node hash-table link. */
115
116 vfs_node_type_t type; /**< Partial info about the node type. */
117
118 aoff64_t size; /**< Cached size if the node is a file. */
119
120 /**
121 * Holding this rwlock prevents modifications of the node's contents.
122 */
123 fibril_rwlock_t contents_rwlock;
124} vfs_node_t;
125
126/**
127 * Instances of this type represent an open file. If the file is opened by more
128 * than one task, there will be a separate structure allocated for each task.
129 */
130typedef struct {
131 /** Serializes access to this open file. */
132 fibril_mutex_t lock;
133
134 vfs_node_t *node;
135
136 /** Number of file handles referencing this file. */
137 unsigned refcnt;
138
139 /** Append on write. */
140 bool append;
141
142 /** Current absolute position in the file. */
143 aoff64_t pos;
144} vfs_file_t;
145
146extern fibril_mutex_t nodes_mutex;
147
148extern fibril_condvar_t fs_list_cv;
149extern fibril_mutex_t fs_list_lock;
150extern list_t fs_list; /**< List of registered file systems. */
151
152extern vfs_pair_t rootfs; /**< Root file system. */
153
154/** Each instance of this type describes one path lookup in progress. */
155typedef struct {
156 link_t plb_link; /**< Active PLB entries list link. */
157 unsigned index; /**< Index of the first character in PLB. */
158 size_t len; /**< Number of characters in this PLB entry. */
159} plb_entry_t;
160
161extern fibril_mutex_t plb_mutex;/**< Mutex protecting plb and plb_entries. */
162extern uint8_t *plb; /**< Path Lookup Buffer */
163extern list_t plb_entries; /**< List of active PLB entries. */
164
165#define MAX_MNTOPTS_LEN 256
166
167/** Holding this rwlock prevents changes in file system namespace. */
168extern fibril_rwlock_t namespace_rwlock;
169
170extern async_exch_t *vfs_exchange_grab(fs_handle_t);
171extern void vfs_exchange_release(async_exch_t *);
172
173extern fs_handle_t fs_name_to_handle(unsigned int instance, char *, bool);
174extern vfs_info_t *fs_handle_to_info(fs_handle_t);
175
176extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *,
177 vfs_pair_t *, ...);
178
179extern bool vfs_nodes_init(void);
180extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
181extern void vfs_node_put(vfs_node_t *);
182extern void vfs_node_forget(vfs_node_t *);
183extern unsigned vfs_nodes_refcount_sum_get(fs_handle_t, service_id_t);
184
185
186#define MAX_OPEN_FILES 128
187
188extern void *vfs_client_data_create(void);
189extern void vfs_client_data_destroy(void *);
190
191extern void vfs_pass_handle(task_id_t, task_id_t, int);
192extern int vfs_wait_handle_internal(void);
193
194extern vfs_file_t *vfs_file_get(int);
195extern void vfs_file_put(vfs_file_t *);
196extern int vfs_fd_assign(vfs_file_t *, int);
197extern int vfs_fd_alloc(bool desc);
198extern int vfs_fd_free(int);
199
200extern void vfs_node_addref(vfs_node_t *);
201extern void vfs_node_delref(vfs_node_t *);
202extern int vfs_open_node_remote(vfs_node_t *);
203
204extern void vfs_register(ipc_callid_t, ipc_call_t *);
205extern void vfs_mount(ipc_callid_t, ipc_call_t *);
206extern void vfs_unmount(ipc_callid_t, ipc_call_t *);
207extern void vfs_open(ipc_callid_t, ipc_call_t *);
208extern void vfs_sync(ipc_callid_t, ipc_call_t *);
209extern void vfs_dup(ipc_callid_t, ipc_call_t *);
210extern void vfs_close(ipc_callid_t, ipc_call_t *);
211extern void vfs_read(ipc_callid_t, ipc_call_t *);
212extern void vfs_write(ipc_callid_t, ipc_call_t *);
213extern void vfs_seek(ipc_callid_t, ipc_call_t *);
214extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
215extern void vfs_fstat(ipc_callid_t, ipc_call_t *);
216extern void vfs_stat(ipc_callid_t, ipc_call_t *);
217extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
218extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
219extern void vfs_rename(ipc_callid_t, ipc_call_t *);
220extern void vfs_wait_handle(ipc_callid_t, ipc_call_t *);
221
222#endif
223
224/**
225 * @}
226 */
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