source: mainline/uspace/srv/vfs/vfs.c@ d9c8c81

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since d9c8c81 was d9c8c81, checked in by Martin Decky <martin@…>, 16 years ago

rename libadt → adt
  • Property mode set to 100644
File size: 5.0 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/**
34 * @file vfs.c
35 * @brief VFS service for HelenOS.
36 */
37
38#include <ipc/ipc.h>
39#include <ipc/services.h>
40#include <async.h>
41#include <errno.h>
42#include <stdio.h>
43#include <bool.h>
44#include <string.h>
45#include <as.h>
46#include <adt/list.h>
47#include <atomic.h>
48#include "vfs.h"
49
50#define NAME "vfs"
51
52static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
53{
54 bool keep_on_going = true;
55
56 /*
57 * The connection was opened via the IPC_CONNECT_ME_TO call.
58 * This call needs to be answered.
59 */
60 ipc_answer_0(iid, EOK);
61
62 /*
63 * Here we enter the main connection fibril loop.
64 * The logic behind this loop and the protocol is that we'd like to keep
65 * each connection open until the client hangs up. When the client hangs
66 * up, we will free its VFS state. The act of hanging up the connection
67 * by the client is equivalent to client termination because we cannot
68 * distinguish one from the other. On the other hand, the client can
69 * hang up arbitrarily if it has no open files and reestablish the
70 * connection later.
71 */
72 while (keep_on_going) {
73 ipc_call_t call;
74 ipc_callid_t callid = async_get_call(&call);
75
76 fs_handle_t fs_handle;
77 int phone;
78
79 switch (IPC_GET_METHOD(call)) {
80 case IPC_M_PHONE_HUNGUP:
81 keep_on_going = false;
82 break;
83 case VFS_REGISTER:
84 vfs_register(callid, &call);
85 /*
86 * Keep the connection open so that a file system can
87 * later ask us to connect it to another file system.
88 * This is necessary to support non-root mounts.
89 */
90 break;
91 case VFS_MOUNT:
92 vfs_mount(callid, &call);
93 break;
94 case VFS_OPEN:
95 vfs_open(callid, &call);
96 break;
97 case VFS_OPEN_NODE:
98 vfs_open_node(callid, &call);
99 break;
100 case VFS_CLOSE:
101 vfs_close(callid, &call);
102 break;
103 case VFS_READ:
104 vfs_read(callid, &call);
105 break;
106 case VFS_WRITE:
107 vfs_write(callid, &call);
108 break;
109 case VFS_SEEK:
110 vfs_seek(callid, &call);
111 break;
112 case VFS_TRUNCATE:
113 vfs_truncate(callid, &call);
114 break;
115 case VFS_MKDIR:
116 vfs_mkdir(callid, &call);
117 break;
118 case VFS_UNLINK:
119 vfs_unlink(callid, &call);
120 break;
121 case VFS_RENAME:
122 vfs_rename(callid, &call);
123 break;
124 case VFS_DEVICE:
125 vfs_device(callid, &call);
126 break;
127 case VFS_SYNC:
128 vfs_sync(callid, &call);
129 break;
130 case VFS_NODE:
131 vfs_node(callid, &call);
132 break;
133 default:
134 ipc_answer_0(callid, ENOTSUP);
135 break;
136 }
137 }
138
139 /* TODO: cleanup after the client */
140}
141
142int main(int argc, char **argv)
143{
144 printf(NAME ": HelenOS VFS server\n");
145
146 /*
147 * Initialize the list of registered file systems.
148 */
149 list_initialize(&fs_head);
150
151 /*
152 * Initialize VFS node hash table.
153 */
154 if (!vfs_nodes_init()) {
155 printf(NAME ": Failed to initialize VFS node hash table\n");
156 return ENOMEM;
157 }
158
159 /*
160 * Allocate and initialize the Path Lookup Buffer.
161 */
162 list_initialize(&plb_head);
163 plb = as_get_mappable_page(PLB_SIZE);
164 if (!plb) {
165 printf(NAME ": Cannot allocate a mappable piece of address space\n");
166 return ENOMEM;
167 }
168
169 if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
170 AS_AREA_CACHEABLE) != plb) {
171 printf(NAME ": Cannot create address space area\n");
172 return ENOMEM;
173 }
174 memset(plb, 0, PLB_SIZE);
175
176 /*
177 * Set a connectio handling function/fibril.
178 */
179 async_set_pending(vfs_process_pending_mount);
180 async_set_client_connection(vfs_connection);
181
182 /*
183 * Register at the naming service.
184 */
185 ipcarg_t phonead;
186 ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
187
188 /*
189 * Start accepting connections.
190 */
191 printf(NAME ": Accepting connections\n");
192 async_manager();
193 return 0;
194}
195
196/**
197 * @}
198 */
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