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1 | /* |
1 | /* |
2 | * Copyright (c) 2008 Jakub Jermar |
2 | * Copyright (c) 2008 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup fs |
29 | /** @addtogroup fs |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file vfs.c |
34 | * @file vfs.c |
35 | * @brief VFS service for HelenOS. |
35 | * @brief VFS service for HelenOS. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <ipc/ipc.h> |
38 | #include <ipc/ipc.h> |
39 | #include <ipc/services.h> |
39 | #include <ipc/services.h> |
40 | #include <async.h> |
40 | #include <async.h> |
41 | #include <errno.h> |
41 | #include <errno.h> |
42 | #include <stdio.h> |
42 | #include <stdio.h> |
43 | #include <bool.h> |
43 | #include <bool.h> |
44 | #include <string.h> |
44 | #include <string.h> |
45 | #include <as.h> |
45 | #include <as.h> |
46 | #include <libadt/list.h> |
46 | #include <libadt/list.h> |
47 | #include <atomic.h> |
47 | #include <atomic.h> |
48 | #include "vfs.h" |
48 | #include "vfs.h" |
49 | 49 | ||
50 | #define NAME "vfs" |
50 | #define NAME "vfs" |
51 | 51 | ||
52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
53 | { |
53 | { |
54 | bool keep_on_going = 1; |
54 | bool keep_on_going = true; |
55 | 55 | ||
56 | /* |
56 | /* |
57 | * The connection was opened via the IPC_CONNECT_ME_TO call. |
57 | * The connection was opened via the IPC_CONNECT_ME_TO call. |
58 | * This call needs to be answered. |
58 | * This call needs to be answered. |
59 | */ |
59 | */ |
60 | ipc_answer_0(iid, EOK); |
60 | ipc_answer_0(iid, EOK); |
61 | 61 | ||
62 | /* |
62 | /* |
63 | * Here we enter the main connection fibril loop. |
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 |
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 |
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 |
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 |
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 |
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 |
69 | * hang up arbitrarily if it has no open files and reestablish the |
70 | * connection later. |
70 | * connection later. |
71 | */ |
71 | */ |
72 | while (keep_on_going) { |
72 | while (keep_on_going) { |
73 | ipc_callid_t callid; |
- | |
74 | ipc_call_t call; |
73 | ipc_call_t call; |
- | 74 | ipc_callid_t callid = async_get_call(&call); |
|
75 | 75 | ||
76 | callid = async_get_call(&call); |
76 | fs_handle_t fs_handle; |
- | 77 | int phone; |
|
77 | 78 | ||
78 | switch (IPC_GET_METHOD(call)) { |
79 | switch (IPC_GET_METHOD(call)) { |
79 | case IPC_M_PHONE_HUNGUP: |
80 | case IPC_M_PHONE_HUNGUP: |
80 | keep_on_going = false; |
81 | keep_on_going = false; |
81 | break; |
82 | break; |
- | 83 | case IPC_M_CONNECT_ME_TO: |
|
- | 84 | /* |
|
- | 85 | * Connect the client file system to another one. |
|
- | 86 | */ |
|
- | 87 | /* FIXME: |
|
- | 88 | * Prevent ordinary clients from connecting to file |
|
- | 89 | * system servers directly. This should be solved by |
|
- | 90 | * applying some security mechanisms. |
|
- | 91 | */ |
|
- | 92 | fs_handle = IPC_GET_ARG1(call); |
|
- | 93 | phone = vfs_grab_phone(fs_handle); |
|
- | 94 | (void) ipc_forward_fast(callid, phone, 0, 0, 0, |
|
- | 95 | IPC_FF_NONE); |
|
- | 96 | vfs_release_phone(phone); |
|
- | 97 | break; |
|
82 | case VFS_REGISTER: |
98 | case VFS_REGISTER: |
83 | vfs_register(callid, &call); |
99 | vfs_register(callid, &call); |
- | 100 | /* |
|
84 | keep_on_going = false; |
101 | * Keep the connection open so that a file system can |
- | 102 | * later ask us to connect it to another file system. |
|
- | 103 | * This is necessary to support non-root mounts. |
|
- | 104 | */ |
|
85 | break; |
105 | break; |
86 | case VFS_MOUNT: |
106 | case VFS_MOUNT: |
87 | vfs_mount(callid, &call); |
107 | vfs_mount(callid, &call); |
88 | break; |
108 | break; |
89 | case VFS_OPEN: |
109 | case VFS_OPEN: |
90 | vfs_open(callid, &call); |
110 | vfs_open(callid, &call); |
91 | break; |
111 | break; |
92 | case VFS_CLOSE: |
112 | case VFS_CLOSE: |
93 | vfs_close(callid, &call); |
113 | vfs_close(callid, &call); |
94 | break; |
114 | break; |
95 | case VFS_READ: |
115 | case VFS_READ: |
96 | vfs_read(callid, &call); |
116 | vfs_read(callid, &call); |
97 | break; |
117 | break; |
98 | case VFS_WRITE: |
118 | case VFS_WRITE: |
99 | vfs_write(callid, &call); |
119 | vfs_write(callid, &call); |
100 | break; |
120 | break; |
101 | case VFS_SEEK: |
121 | case VFS_SEEK: |
102 | vfs_seek(callid, &call); |
122 | vfs_seek(callid, &call); |
103 | break; |
123 | break; |
104 | case VFS_TRUNCATE: |
124 | case VFS_TRUNCATE: |
105 | vfs_truncate(callid, &call); |
125 | vfs_truncate(callid, &call); |
106 | break; |
126 | break; |
107 | case VFS_MKDIR: |
127 | case VFS_MKDIR: |
108 | vfs_mkdir(callid, &call); |
128 | vfs_mkdir(callid, &call); |
109 | break; |
129 | break; |
110 | case VFS_UNLINK: |
130 | case VFS_UNLINK: |
111 | vfs_unlink(callid, &call); |
131 | vfs_unlink(callid, &call); |
112 | break; |
132 | break; |
113 | case VFS_RENAME: |
133 | case VFS_RENAME: |
114 | vfs_rename(callid, &call); |
134 | vfs_rename(callid, &call); |
115 | break; |
135 | break; |
116 | default: |
136 | default: |
117 | ipc_answer_0(callid, ENOTSUP); |
137 | ipc_answer_0(callid, ENOTSUP); |
118 | break; |
138 | break; |
119 | } |
139 | } |
120 | } |
140 | } |
121 | - | ||
122 | /* TODO: cleanup after the client */ |
- | |
123 | 141 | ||
- | 142 | /* TODO: cleanup after the client */ |
|
124 | } |
143 | } |
125 | 144 | ||
126 | int main(int argc, char **argv) |
145 | int main(int argc, char **argv) |
127 | { |
146 | { |
128 | ipcarg_t phonead; |
- | |
129 | - | ||
130 | printf(NAME ": HelenOS VFS server\n"); |
147 | printf(NAME ": HelenOS VFS server\n"); |
131 | 148 | ||
132 | /* |
149 | /* |
133 | * Initialize the list of registered file systems. |
150 | * Initialize the list of registered file systems. |
134 | */ |
151 | */ |
135 | list_initialize(&fs_head); |
152 | list_initialize(&fs_head); |
136 | 153 | ||
137 | /* |
154 | /* |
138 | * Initialize VFS node hash table. |
155 | * Initialize VFS node hash table. |
139 | */ |
156 | */ |
140 | if (!vfs_nodes_init()) { |
157 | if (!vfs_nodes_init()) { |
141 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
158 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
142 | return ENOMEM; |
159 | return ENOMEM; |
143 | } |
160 | } |
144 | 161 | ||
145 | /* |
162 | /* |
146 | * Allocate and initialize the Path Lookup Buffer. |
163 | * Allocate and initialize the Path Lookup Buffer. |
147 | */ |
164 | */ |
148 | list_initialize(&plb_head); |
165 | list_initialize(&plb_head); |
149 | plb = as_get_mappable_page(PLB_SIZE); |
166 | plb = as_get_mappable_page(PLB_SIZE); |
150 | if (!plb) { |
167 | if (!plb) { |
151 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
168 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
152 | return ENOMEM; |
169 | return ENOMEM; |
153 | } |
170 | } |
- | 171 | ||
154 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
172 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
155 | AS_AREA_CACHEABLE) != plb) { |
173 | AS_AREA_CACHEABLE) != plb) { |
156 | printf(NAME ": Cannot create address space area\n"); |
174 | printf(NAME ": Cannot create address space area\n"); |
157 | return ENOMEM; |
175 | return ENOMEM; |
158 | } |
176 | } |
159 | memset(plb, 0, PLB_SIZE); |
177 | memset(plb, 0, PLB_SIZE); |
160 | 178 | ||
161 | /* |
179 | /* |
162 | * Set a connectio handling function/fibril. |
180 | * Set a connectio handling function/fibril. |
163 | */ |
181 | */ |
164 | async_set_client_connection(vfs_connection); |
182 | async_set_client_connection(vfs_connection); |
165 | 183 | ||
166 | /* |
184 | /* |
167 | * Register at the naming service. |
185 | * Register at the naming service. |
168 | */ |
186 | */ |
- | 187 | ipcarg_t phonead; |
|
169 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
188 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
170 | 189 | ||
171 | /* |
190 | /* |
172 | * Start accepting connections. |
191 | * Start accepting connections. |
173 | */ |
192 | */ |
174 | printf(NAME ": Accepting connections\n"); |
193 | printf(NAME ": Accepting connections\n"); |
175 | async_manager(); |
194 | async_manager(); |
176 | return 0; |
195 | return 0; |
177 | } |
196 | } |
178 | 197 | ||
179 | /** |
198 | /** |
180 | * @} |
199 | * @} |
181 | */ |
200 | */ |
182 | 201 |