source: mainline/uspace/srv/fs/devfs/devfs.c@ fe2333d

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since fe2333d was 5581b469, checked in by Jakub Jermar <jakub@…>, 15 years ago

Introduce new boolean properties into vfs_info_t.

The FS can set concurrent_read_write to true if it is ready to handle
concurrent reads and writes from/to one node.

The FS can set write_retains_size if its write method never modifies the
size of the node.
  • Property mode set to 100644
File size: 3.7 KB
Line 
1/*
2 * Copyright (c) 2009 Martin Decky
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 devfs.c
35 * @brief Devices file system.
36 *
37 * Every device registered to device mapper is represented as a file in this
38 * file system.
39 */
40
41#include <stdio.h>
42#include <ipc/ipc.h>
43#include <ipc/services.h>
44#include <async.h>
45#include <errno.h>
46#include <task.h>
47#include <libfs.h>
48#include "devfs.h"
49#include "devfs_ops.h"
50
51#define NAME "devfs"
52
53static vfs_info_t devfs_vfs_info = {
54 .name = NAME,
55 .concurrent_read_write = false,
56 .write_retains_size = false,
57};
58
59fs_reg_t devfs_reg;
60
61static void devfs_connection(ipc_callid_t iid, ipc_call_t *icall)
62{
63 if (iid)
64 ipc_answer_0(iid, EOK);
65
66 while (true) {
67 ipc_call_t call;
68 ipc_callid_t callid = async_get_call(&call);
69
70 switch (IPC_GET_METHOD(call)) {
71 case IPC_M_PHONE_HUNGUP:
72 return;
73 case VFS_OUT_MOUNTED:
74 devfs_mounted(callid, &call);
75 break;
76 case VFS_OUT_MOUNT:
77 devfs_mount(callid, &call);
78 break;
79 case VFS_OUT_UNMOUNTED:
80 devfs_unmounted(callid, &call);
81 break;
82 case VFS_OUT_UNMOUNT:
83 devfs_unmount(callid, &call);
84 break;
85 case VFS_OUT_LOOKUP:
86 devfs_lookup(callid, &call);
87 break;
88 case VFS_OUT_OPEN_NODE:
89 devfs_open_node(callid, &call);
90 break;
91 case VFS_OUT_STAT:
92 devfs_stat(callid, &call);
93 break;
94 case VFS_OUT_READ:
95 devfs_read(callid, &call);
96 break;
97 case VFS_OUT_WRITE:
98 devfs_write(callid, &call);
99 break;
100 case VFS_OUT_TRUNCATE:
101 devfs_truncate(callid, &call);
102 break;
103 case VFS_OUT_CLOSE:
104 devfs_close(callid, &call);
105 break;
106 case VFS_OUT_SYNC:
107 devfs_sync(callid, &call);
108 break;
109 case VFS_OUT_DESTROY:
110 devfs_destroy(callid, &call);
111 break;
112 default:
113 ipc_answer_0(callid, ENOTSUP);
114 break;
115 }
116 }
117}
118
119int main(int argc, char *argv[])
120{
121 printf(NAME ": HelenOS Device Filesystem\n");
122
123 if (!devfs_init()) {
124 printf(NAME ": failed to initialize devfs\n");
125 return -1;
126 }
127
128 int vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
129 if (vfs_phone < EOK) {
130 printf(NAME ": Unable to connect to VFS\n");
131 return -1;
132 }
133
134 int rc = fs_register(vfs_phone, &devfs_reg, &devfs_vfs_info,
135 devfs_connection);
136 if (rc != EOK) {
137 printf(NAME ": Failed to register file system (%d)\n", rc);
138 return rc;
139 }
140
141 printf(NAME ": Accepting connections\n");
142 task_retval(0);
143 async_manager();
144
145 /* Not reached */
146 return 0;
147}
148
149/**
150 * @}
151 */
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