source: mainline/uspace/srv/fs/ext2fs/ext2fs.c@ a210bc7

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a210bc7 was 4dc6a32, checked in by Martin Sucha <sucha14@…>, 14 years ago

ext2fs server now (almost, as it is not synchronized yet) supports mounting and basic reading of directories
  • Property mode set to 100644
File size: 4.8 KB
Line 
1/*
2 * Copyright (c) 2006 Martin Decky
3 * Copyright (c) 2008 Jakub Jermar
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup fs
31 * @{
32 */
33
34/**
35 * @file ext2.c
36 * @brief EXT2 file system driver for HelenOS.
37 */
38
39#include "ext2fs.h"
40#include <ipc/services.h>
41#include <ipc/ns.h>
42#include <async.h>
43#include <errno.h>
44#include <unistd.h>
45#include <task.h>
46#include <stdio.h>
47#include <libfs.h>
48#include "../../vfs/vfs.h"
49
50#define NAME "ext2fs"
51
52vfs_info_t ext2fs_vfs_info = {
53 .name = NAME,
54};
55
56fs_reg_t ext2fs_reg;
57
58/**
59 * This connection fibril processes VFS requests from VFS.
60 *
61 * In order to support simultaneous VFS requests, our design is as follows.
62 * The connection fibril accepts VFS requests from VFS. If there is only one
63 * instance of the fibril, VFS will need to serialize all VFS requests it sends
64 * to EXT2FS. To overcome this bottleneck, VFS can send EXT2FS the IPC_M_CONNECT_ME_TO
65 * call. In that case, a new connection fibril will be created, which in turn
66 * will accept the call. Thus, a new phone will be opened for VFS.
67 *
68 * There are few issues with this arrangement. First, VFS can run out of
69 * available phones. In that case, VFS can close some other phones or use one
70 * phone for more serialized requests. Similarily, EXT2FS can refuse to duplicate
71 * the connection. VFS should then just make use of already existing phones and
72 * route its requests through them. To avoid paying the fibril creation price
73 * upon each request, EXT2FS might want to keep the connections open after the
74 * request has been completed.
75 */
76static void ext2fs_connection(ipc_callid_t iid, ipc_call_t *icall)
77{
78 if (iid) {
79 /*
80 * This only happens for connections opened by
81 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
82 * created by IPC_M_CONNECT_TO_ME.
83 */
84 async_answer_0(iid, EOK);
85 }
86
87 dprintf(NAME ": connection opened\n");
88 while (1) {
89 ipc_callid_t callid;
90 ipc_call_t call;
91
92 callid = async_get_call(&call);
93 switch (IPC_GET_IMETHOD(call)) {
94 case IPC_M_PHONE_HUNGUP:
95 return;
96 case VFS_OUT_MOUNTED:
97 ext2fs_mounted(callid, &call);
98 break;
99 case VFS_OUT_MOUNT:
100 ext2fs_mount(callid, &call);
101 break;
102 case VFS_OUT_UNMOUNTED:
103 ext2fs_unmounted(callid, &call);
104 break;
105 case VFS_OUT_UNMOUNT:
106 ext2fs_unmount(callid, &call);
107 break;
108 case VFS_OUT_LOOKUP:
109 ext2fs_lookup(callid, &call);
110 break;
111 case VFS_OUT_READ:
112 ext2fs_read(callid, &call);
113 break;
114 case VFS_OUT_WRITE:
115 ext2fs_write(callid, &call);
116 break;
117 case VFS_OUT_TRUNCATE:
118 ext2fs_truncate(callid, &call);
119 break;
120 case VFS_OUT_STAT:
121 ext2fs_stat(callid, &call);
122 break;
123 case VFS_OUT_CLOSE:
124 ext2fs_close(callid, &call);
125 break;
126 case VFS_OUT_DESTROY:
127 ext2fs_destroy(callid, &call);
128 break;
129 case VFS_OUT_OPEN_NODE:
130 ext2fs_open_node(callid, &call);
131 break;
132 case VFS_OUT_SYNC:
133 ext2fs_sync(callid, &call);
134 break;
135 default:
136 async_answer_0(callid, ENOTSUP);
137 break;
138 }
139 }
140}
141
142int main(int argc, char **argv)
143{
144 int vfs_phone;
145 int rc;
146
147 printf(NAME ": HelenOS EXT2 file system server\n");
148
149 vfs_phone = service_connect_blocking(SERVICE_VFS, 0, 0);
150 if (vfs_phone < EOK) {
151 printf(NAME ": failed to connect to VFS\n");
152 return -1;
153 }
154
155 rc = ext2fs_global_init();
156 if (rc != EOK) {
157 printf(NAME ": Failed global initialization\n");
158 return 1;
159 }
160
161 rc = fs_register(vfs_phone, &ext2fs_reg, &ext2fs_vfs_info, ext2fs_connection);
162
163 printf(NAME ": Accepting connections\n");
164 task_retval(0);
165 async_manager();
166 /* not reached */
167 return 0;
168}
169
170/**
171 * @}
172 */
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