source: mainline/uspace/srv/vfs/vfs.c@ af7383f3

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since af7383f3 was af7383f3, checked in by Jakub Jermar <jakub@…>, 16 years ago

Handle pending mounts using only one fibril.
  • Property mode set to 100644
File size: 5.1 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 <assert.h>
49#include "vfs.h"
50
51#define NAME "vfs"
52
53static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
54{
55 bool keep_on_going = true;
56
57 /*
58 * The connection was opened via the IPC_CONNECT_ME_TO call.
59 * This call needs to be answered.
60 */
61 ipc_answer_0(iid, EOK);
62
63 /*
64 * Here we enter the main connection fibril loop.
65 * The logic behind this loop and the protocol is that we'd like to keep
66 * each connection open until the client hangs up. When the client hangs
67 * up, we will free its VFS state. The act of hanging up the connection
68 * by the client is equivalent to client termination because we cannot
69 * distinguish one from the other. On the other hand, the client can
70 * hang up arbitrarily if it has no open files and reestablish the
71 * connection later.
72 */
73 while (keep_on_going) {
74 ipc_call_t call;
75 ipc_callid_t callid = async_get_call(&call);
76
77 fs_handle_t fs_handle;
78 int phone;
79
80 switch (IPC_GET_METHOD(call)) {
81 case IPC_M_PHONE_HUNGUP:
82 keep_on_going = false;
83 break;
84 case VFS_REGISTER:
85 vfs_register(callid, &call);
86 /*
87 * Keep the connection open so that a file system can
88 * later ask us to connect it to another file system.
89 * This is necessary to support non-root mounts.
90 */
91 break;
92 case VFS_MOUNT:
93 vfs_mount(callid, &call);
94 break;
95 case VFS_OPEN:
96 vfs_open(callid, &call);
97 break;
98 case VFS_OPEN_NODE:
99 vfs_open_node(callid, &call);
100 break;
101 case VFS_CLOSE:
102 vfs_close(callid, &call);
103 break;
104 case VFS_READ:
105 vfs_read(callid, &call);
106 break;
107 case VFS_WRITE:
108 vfs_write(callid, &call);
109 break;
110 case VFS_SEEK:
111 vfs_seek(callid, &call);
112 break;
113 case VFS_TRUNCATE:
114 vfs_truncate(callid, &call);
115 break;
116 case VFS_MKDIR:
117 vfs_mkdir(callid, &call);
118 break;
119 case VFS_UNLINK:
120 vfs_unlink(callid, &call);
121 break;
122 case VFS_RENAME:
123 vfs_rename(callid, &call);
124 break;
125 case VFS_DEVICE:
126 vfs_device(callid, &call);
127 break;
128 case VFS_SYNC:
129 vfs_sync(callid, &call);
130 break;
131 case VFS_NODE:
132 vfs_node(callid, &call);
133 break;
134 default:
135 ipc_answer_0(callid, ENOTSUP);
136 break;
137 }
138 }
139
140 /* TODO: cleanup after the client */
141}
142
143int main(int argc, char **argv)
144{
145 printf(NAME ": HelenOS VFS server\n");
146
147 /*
148 * Initialize the list of registered file systems.
149 */
150 list_initialize(&fs_head);
151
152 /*
153 * Initialize VFS node hash table.
154 */
155 if (!vfs_nodes_init()) {
156 printf(NAME ": Failed to initialize VFS node hash table\n");
157 return ENOMEM;
158 }
159
160 /*
161 * Allocate and initialize the Path Lookup Buffer.
162 */
163 list_initialize(&plb_head);
164 plb = as_get_mappable_page(PLB_SIZE);
165 if (!plb) {
166 printf(NAME ": Cannot allocate a mappable piece of address space\n");
167 return ENOMEM;
168 }
169
170 if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
171 AS_AREA_CACHEABLE) != plb) {
172 printf(NAME ": Cannot create address space area\n");
173 return ENOMEM;
174 }
175 memset(plb, 0, PLB_SIZE);
176
177 /*
178 * Set a connection handling function/fibril.
179 */
180 async_set_client_connection(vfs_connection);
181
182 /*
183 * Add a fibril for handling pending mounts.
184 */
185 fid_t fid = fibril_create(vfs_process_pending_mount, NULL);
186 assert(fid);
187 fibril_add_ready(fid);
188
189 /*
190 * Register at the naming service.
191 */
192 ipcarg_t phonead;
193 ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
194
195 /*
196 * Start accepting connections.
197 */
198 printf(NAME ": Accepting connections\n");
199 async_manager();
200 return 0;
201}
202
203/**
204 * @}
205 */
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