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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Martin Decky |
2 | * Copyright (c) 2006 Martin Decky |
3 | * Copyright (c) 2008 Jakub Jermar |
3 | * Copyright (c) 2008 Jakub Jermar |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup fs |
30 | /** @addtogroup fs |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | 33 | ||
34 | /** |
34 | /** |
35 | * @file tmpfs.c |
35 | * @file tmpfs.c |
36 | * @brief File system driver for in-memory file system. |
36 | * @brief File system driver for in-memory file system. |
37 | * |
37 | * |
38 | * Every instance of tmpfs exists purely in memory and has neither a disk layout |
38 | * Every instance of tmpfs exists purely in memory and has neither a disk layout |
39 | * nor any permanent storage (e.g. disk blocks). With each system reboot, data |
39 | * nor any permanent storage (e.g. disk blocks). With each system reboot, data |
40 | * stored in a tmpfs file system is lost. |
40 | * stored in a tmpfs file system is lost. |
41 | */ |
41 | */ |
42 | 42 | ||
43 | #include "tmpfs.h" |
43 | #include "tmpfs.h" |
44 | #include <ipc/ipc.h> |
44 | #include <ipc/ipc.h> |
45 | #include <ipc/services.h> |
45 | #include <ipc/services.h> |
46 | #include <async.h> |
46 | #include <async.h> |
47 | #include <errno.h> |
47 | #include <errno.h> |
48 | #include <unistd.h> |
48 | #include <unistd.h> |
49 | #include <stdio.h> |
49 | #include <stdio.h> |
50 | #include <libfs.h> |
50 | #include <libfs.h> |
51 | #include "../../vfs/vfs.h" |
51 | #include "../../vfs/vfs.h" |
52 | 52 | ||
- | 53 | #define NAME "tmpfs" |
|
- | 54 | ||
53 | 55 | ||
54 | vfs_info_t tmpfs_vfs_info = { |
56 | vfs_info_t tmpfs_vfs_info = { |
55 | .name = "tmpfs", |
57 | .name = "tmpfs", |
56 | .ops = { |
58 | .ops = { |
57 | [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED, |
59 | [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED, |
58 | [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED, |
60 | [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED, |
59 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_DEFINED, |
61 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_DEFINED, |
60 | [IPC_METHOD_TO_VFS_OP(VFS_TRUNCATE)] = VFS_OP_DEFINED, |
62 | [IPC_METHOD_TO_VFS_OP(VFS_TRUNCATE)] = VFS_OP_DEFINED, |
61 | [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED, |
63 | [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED, |
62 | [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_NULL, |
64 | [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_NULL, |
63 | [IPC_METHOD_TO_VFS_OP(VFS_DESTROY)] = VFS_OP_DEFINED, |
65 | [IPC_METHOD_TO_VFS_OP(VFS_DESTROY)] = VFS_OP_DEFINED, |
64 | } |
66 | } |
65 | }; |
67 | }; |
66 | 68 | ||
67 | fs_reg_t tmpfs_reg; |
69 | fs_reg_t tmpfs_reg; |
68 | 70 | ||
69 | /** |
71 | /** |
70 | * This connection fibril processes VFS requests from VFS. |
72 | * This connection fibril processes VFS requests from VFS. |
71 | * |
73 | * |
72 | * In order to support simultaneous VFS requests, our design is as follows. |
74 | * In order to support simultaneous VFS requests, our design is as follows. |
73 | * The connection fibril accepts VFS requests from VFS. If there is only one |
75 | * The connection fibril accepts VFS requests from VFS. If there is only one |
74 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
76 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
75 | * to FAT. To overcome this bottleneck, VFS can send TMPFS the |
77 | * to FAT. To overcome this bottleneck, VFS can send TMPFS the |
76 | * IPC_M_CONNECT_ME_TO call. In that case, a new connection fibril will be |
78 | * IPC_M_CONNECT_ME_TO call. In that case, a new connection fibril will be |
77 | * created, which in turn will accept the call. Thus, a new phone will be |
79 | * created, which in turn will accept the call. Thus, a new phone will be |
78 | * opened for VFS. |
80 | * opened for VFS. |
79 | * |
81 | * |
80 | * There are few issues with this arrangement. First, VFS can run out of |
82 | * There are few issues with this arrangement. First, VFS can run out of |
81 | * available phones. In that case, VFS can close some other phones or use one |
83 | * available phones. In that case, VFS can close some other phones or use one |
82 | * phone for more serialized requests. Similarily, TMPFS can refuse to duplicate |
84 | * phone for more serialized requests. Similarily, TMPFS can refuse to duplicate |
83 | * the connection. VFS should then just make use of already existing phones and |
85 | * the connection. VFS should then just make use of already existing phones and |
84 | * route its requests through them. To avoid paying the fibril creation price |
86 | * route its requests through them. To avoid paying the fibril creation price |
85 | * upon each request, TMPFS might want to keep the connections open after the |
87 | * upon each request, TMPFS might want to keep the connections open after the |
86 | * request has been completed. |
88 | * request has been completed. |
87 | */ |
89 | */ |
88 | static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
90 | static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
89 | { |
91 | { |
90 | if (iid) { |
92 | if (iid) { |
91 | /* |
93 | /* |
92 | * This only happens for connections opened by |
94 | * This only happens for connections opened by |
93 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
95 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
94 | * created by IPC_M_CONNECT_TO_ME. |
96 | * created by IPC_M_CONNECT_TO_ME. |
95 | */ |
97 | */ |
96 | ipc_answer_0(iid, EOK); |
98 | ipc_answer_0(iid, EOK); |
97 | } |
99 | } |
98 | 100 | ||
99 | dprintf("VFS-TMPFS connection established.\n"); |
101 | dprintf("VFS-TMPFS connection established.\n"); |
100 | while (1) { |
102 | while (1) { |
101 | ipc_callid_t callid; |
103 | ipc_callid_t callid; |
102 | ipc_call_t call; |
104 | ipc_call_t call; |
103 | 105 | ||
104 | callid = async_get_call(&call); |
106 | callid = async_get_call(&call); |
105 | switch (IPC_GET_METHOD(call)) { |
107 | switch (IPC_GET_METHOD(call)) { |
106 | case VFS_MOUNT: |
108 | case VFS_MOUNT: |
107 | tmpfs_mount(callid, &call); |
109 | tmpfs_mount(callid, &call); |
108 | break; |
110 | break; |
109 | case VFS_LOOKUP: |
111 | case VFS_LOOKUP: |
110 | tmpfs_lookup(callid, &call); |
112 | tmpfs_lookup(callid, &call); |
111 | break; |
113 | break; |
112 | case VFS_READ: |
114 | case VFS_READ: |
113 | tmpfs_read(callid, &call); |
115 | tmpfs_read(callid, &call); |
114 | break; |
116 | break; |
115 | case VFS_WRITE: |
117 | case VFS_WRITE: |
116 | tmpfs_write(callid, &call); |
118 | tmpfs_write(callid, &call); |
117 | break; |
119 | break; |
118 | case VFS_TRUNCATE: |
120 | case VFS_TRUNCATE: |
119 | tmpfs_truncate(callid, &call); |
121 | tmpfs_truncate(callid, &call); |
120 | break; |
122 | break; |
121 | case VFS_DESTROY: |
123 | case VFS_DESTROY: |
122 | tmpfs_destroy(callid, &call); |
124 | tmpfs_destroy(callid, &call); |
123 | break; |
125 | break; |
124 | default: |
126 | default: |
125 | ipc_answer_0(callid, ENOTSUP); |
127 | ipc_answer_0(callid, ENOTSUP); |
126 | break; |
128 | break; |
127 | } |
129 | } |
128 | } |
130 | } |
129 | } |
131 | } |
130 | 132 | ||
131 | int main(int argc, char **argv) |
133 | int main(int argc, char **argv) |
132 | { |
134 | { |
133 | int vfs_phone; |
135 | int vfs_phone; |
134 | 136 | ||
135 | printf("TMPFS: HelenOS TMPFS file system server.\n"); |
137 | printf(NAME ": HelenOS TMPFS file system server\n"); |
136 | 138 | ||
137 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
139 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
138 | while (vfs_phone < EOK) { |
140 | while (vfs_phone < EOK) { |
139 | usleep(10000); |
141 | usleep(10000); |
140 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
142 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
141 | } |
143 | } |
142 | 144 | ||
143 | int rc; |
145 | int rc; |
144 | rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info, |
146 | rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info, |
145 | tmpfs_connection); |
147 | tmpfs_connection); |
146 | if (rc != EOK) { |
148 | if (rc != EOK) { |
147 | printf("Failed to register the TMPFS file system (%d)\n", rc); |
149 | printf(NAME ": Failed to register file system (%d)\n", rc); |
148 | return rc; |
150 | return rc; |
149 | } |
151 | } |
150 | 152 | ||
151 | dprintf("TMPFS filesystem registered, fs_handle=%d.\n", |
153 | printf(NAME ": Accepting connections\n"); |
152 | tmpfs_reg.fs_handle); |
- | |
153 | - | ||
154 | async_manager(); |
154 | async_manager(); |
155 | /* not reached */ |
155 | /* not reached */ |
156 | return 0; |
156 | return 0; |
157 | } |
157 | } |
158 | 158 | ||
159 | /** |
159 | /** |
160 | * @} |
160 | * @} |
161 | */ |
161 | */ |
162 | 162 |