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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 = true; |
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_call_t call; |
73 | ipc_call_t call; |
74 | ipc_callid_t callid = async_get_call(&call); |
74 | ipc_callid_t callid = async_get_call(&call); |
75 | 75 | ||
76 | fs_handle_t fs_handle; |
76 | fs_handle_t fs_handle; |
77 | int phone; |
77 | int phone; |
78 | 78 | ||
79 | switch (IPC_GET_METHOD(call)) { |
79 | switch (IPC_GET_METHOD(call)) { |
80 | case IPC_M_PHONE_HUNGUP: |
80 | case IPC_M_PHONE_HUNGUP: |
81 | keep_on_going = false; |
81 | keep_on_going = false; |
82 | 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; |
- | |
98 | case VFS_REGISTER: |
83 | case VFS_REGISTER: |
99 | vfs_register(callid, &call); |
84 | vfs_register(callid, &call); |
100 | /* |
85 | /* |
101 | * Keep the connection open so that a file system can |
86 | * Keep the connection open so that a file system can |
102 | * later ask us to connect it to another file system. |
87 | * later ask us to connect it to another file system. |
103 | * This is necessary to support non-root mounts. |
88 | * This is necessary to support non-root mounts. |
104 | */ |
89 | */ |
105 | break; |
90 | break; |
106 | case VFS_MOUNT: |
91 | case VFS_MOUNT: |
107 | vfs_mount(callid, &call); |
92 | vfs_mount(callid, &call); |
108 | break; |
93 | break; |
109 | case VFS_OPEN: |
94 | case VFS_OPEN: |
110 | vfs_open(callid, &call); |
95 | vfs_open(callid, &call); |
111 | break; |
96 | break; |
112 | case VFS_CLOSE: |
97 | case VFS_CLOSE: |
113 | vfs_close(callid, &call); |
98 | vfs_close(callid, &call); |
114 | break; |
99 | break; |
115 | case VFS_READ: |
100 | case VFS_READ: |
116 | vfs_read(callid, &call); |
101 | vfs_read(callid, &call); |
117 | break; |
102 | break; |
118 | case VFS_WRITE: |
103 | case VFS_WRITE: |
119 | vfs_write(callid, &call); |
104 | vfs_write(callid, &call); |
120 | break; |
105 | break; |
121 | case VFS_SEEK: |
106 | case VFS_SEEK: |
122 | vfs_seek(callid, &call); |
107 | vfs_seek(callid, &call); |
123 | break; |
108 | break; |
124 | case VFS_TRUNCATE: |
109 | case VFS_TRUNCATE: |
125 | vfs_truncate(callid, &call); |
110 | vfs_truncate(callid, &call); |
126 | break; |
111 | break; |
127 | case VFS_MKDIR: |
112 | case VFS_MKDIR: |
128 | vfs_mkdir(callid, &call); |
113 | vfs_mkdir(callid, &call); |
129 | break; |
114 | break; |
130 | case VFS_UNLINK: |
115 | case VFS_UNLINK: |
131 | vfs_unlink(callid, &call); |
116 | vfs_unlink(callid, &call); |
132 | break; |
117 | break; |
133 | case VFS_RENAME: |
118 | case VFS_RENAME: |
134 | vfs_rename(callid, &call); |
119 | vfs_rename(callid, &call); |
135 | break; |
120 | break; |
136 | default: |
121 | default: |
137 | ipc_answer_0(callid, ENOTSUP); |
122 | ipc_answer_0(callid, ENOTSUP); |
138 | break; |
123 | break; |
139 | } |
124 | } |
140 | } |
125 | } |
141 | 126 | ||
142 | /* TODO: cleanup after the client */ |
127 | /* TODO: cleanup after the client */ |
143 | } |
128 | } |
144 | 129 | ||
145 | int main(int argc, char **argv) |
130 | int main(int argc, char **argv) |
146 | { |
131 | { |
147 | printf(NAME ": HelenOS VFS server\n"); |
132 | printf(NAME ": HelenOS VFS server\n"); |
148 | 133 | ||
149 | /* |
134 | /* |
150 | * Initialize the list of registered file systems. |
135 | * Initialize the list of registered file systems. |
151 | */ |
136 | */ |
152 | list_initialize(&fs_head); |
137 | list_initialize(&fs_head); |
153 | 138 | ||
154 | /* |
139 | /* |
155 | * Initialize VFS node hash table. |
140 | * Initialize VFS node hash table. |
156 | */ |
141 | */ |
157 | if (!vfs_nodes_init()) { |
142 | if (!vfs_nodes_init()) { |
158 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
143 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
159 | return ENOMEM; |
144 | return ENOMEM; |
160 | } |
145 | } |
161 | 146 | ||
162 | /* |
147 | /* |
163 | * Allocate and initialize the Path Lookup Buffer. |
148 | * Allocate and initialize the Path Lookup Buffer. |
164 | */ |
149 | */ |
165 | list_initialize(&plb_head); |
150 | list_initialize(&plb_head); |
166 | plb = as_get_mappable_page(PLB_SIZE); |
151 | plb = as_get_mappable_page(PLB_SIZE); |
167 | if (!plb) { |
152 | if (!plb) { |
168 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
153 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
169 | return ENOMEM; |
154 | return ENOMEM; |
170 | } |
155 | } |
171 | 156 | ||
172 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
157 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
173 | AS_AREA_CACHEABLE) != plb) { |
158 | AS_AREA_CACHEABLE) != plb) { |
174 | printf(NAME ": Cannot create address space area\n"); |
159 | printf(NAME ": Cannot create address space area\n"); |
175 | return ENOMEM; |
160 | return ENOMEM; |
176 | } |
161 | } |
177 | memset(plb, 0, PLB_SIZE); |
162 | memset(plb, 0, PLB_SIZE); |
178 | 163 | ||
179 | /* |
164 | /* |
180 | * Set a connectio handling function/fibril. |
165 | * Set a connectio handling function/fibril. |
181 | */ |
166 | */ |
182 | async_set_client_connection(vfs_connection); |
167 | async_set_client_connection(vfs_connection); |
183 | 168 | ||
184 | /* |
169 | /* |
185 | * Register at the naming service. |
170 | * Register at the naming service. |
186 | */ |
171 | */ |
187 | ipcarg_t phonead; |
172 | ipcarg_t phonead; |
188 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
173 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
189 | 174 | ||
190 | /* |
175 | /* |
191 | * Start accepting connections. |
176 | * Start accepting connections. |
192 | */ |
177 | */ |
193 | printf(NAME ": Accepting connections\n"); |
178 | printf(NAME ": Accepting connections\n"); |
194 | async_manager(); |
179 | async_manager(); |
195 | return 0; |
180 | return 0; |
196 | } |
181 | } |
197 | 182 | ||
198 | /** |
183 | /** |
199 | * @} |
184 | * @} |
200 | */ |
185 | */ |
201 | 186 |