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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Martin Decky |
2 | * Copyright (c) 2006 Martin Decky |
3 | * Copyright (c) 2007 Jakub Jermar |
3 | * Copyright (c) 2007 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 fat.c |
35 | * @file fat.c |
36 | * @brief FAT file system driver for HelenOS. |
36 | * @brief FAT file system driver for HelenOS. |
37 | */ |
37 | */ |
38 | 38 | ||
39 | #include "fat.h" |
39 | #include "fat.h" |
40 | #include <ipc/ipc.h> |
40 | #include <ipc/ipc.h> |
41 | #include <ipc/services.h> |
41 | #include <ipc/services.h> |
42 | #include <async.h> |
42 | #include <async.h> |
43 | #include <errno.h> |
43 | #include <errno.h> |
44 | #include <unistd.h> |
44 | #include <unistd.h> |
45 | #include <stdio.h> |
45 | #include <stdio.h> |
46 | #include <libfs.h> |
46 | #include <libfs.h> |
47 | #include "../../vfs/vfs.h" |
47 | #include "../../vfs/vfs.h" |
48 | 48 | ||
49 | 49 | ||
50 | vfs_info_t fat_vfs_info = { |
50 | vfs_info_t fat_vfs_info = { |
51 | .name = "fat", |
51 | .name = "fat", |
52 | .ops = { |
52 | .ops = { |
53 | [IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] = VFS_OP_DEFINED, |
53 | [IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] = VFS_OP_DEFINED, |
54 | [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED, |
54 | [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED, |
55 | [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_DEFINED, |
55 | [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_DEFINED, |
56 | [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED, |
56 | [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED, |
57 | [IPC_METHOD_TO_VFS_OP(VFS_OPEN)] = VFS_OP_DEFINED, |
57 | [IPC_METHOD_TO_VFS_OP(VFS_OPEN)] = VFS_OP_DEFINED, |
58 | [IPC_METHOD_TO_VFS_OP(VFS_CREATE)] = VFS_OP_DEFINED, |
58 | [IPC_METHOD_TO_VFS_OP(VFS_CREATE)] = VFS_OP_DEFINED, |
59 | [IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] = VFS_OP_DEFINED, |
59 | [IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] = VFS_OP_DEFINED, |
60 | [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED, |
60 | [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED, |
61 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL, |
61 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL, |
62 | [IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT |
62 | [IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT |
63 | } |
63 | } |
64 | }; |
64 | }; |
65 | 65 | ||
66 | fs_reg_t fat_reg; |
66 | fs_reg_t fat_reg; |
67 | 67 | ||
68 | /** |
68 | /** |
69 | * This connection fibril processes VFS requests from VFS. |
69 | * This connection fibril processes VFS requests from VFS. |
70 | * |
70 | * |
71 | * In order to support simultaneous VFS requests, our design is as follows. |
71 | * In order to support simultaneous VFS requests, our design is as follows. |
72 | * The connection fibril accepts VFS requests from VFS. If there is only one |
72 | * The connection fibril accepts VFS requests from VFS. If there is only one |
73 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
73 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
74 | * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO |
74 | * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO |
75 | * call. In that case, a new connection fibril will be created, which in turn |
75 | * call. In that case, a new connection fibril will be created, which in turn |
76 | * will accept the call. Thus, a new phone will be opened for VFS. |
76 | * will accept the call. Thus, a new phone will be opened for VFS. |
77 | * |
77 | * |
78 | * There are few issues with this arrangement. First, VFS can run out of |
78 | * There are few issues with this arrangement. First, VFS can run out of |
79 | * available phones. In that case, VFS can close some other phones or use one |
79 | * available phones. In that case, VFS can close some other phones or use one |
80 | * phone for more serialized requests. Similarily, FAT can refuse to duplicate |
80 | * phone for more serialized requests. Similarily, FAT can refuse to duplicate |
81 | * the connection. VFS should then just make use of already existing phones and |
81 | * the connection. VFS should then just make use of already existing phones and |
82 | * route its requests through them. To avoid paying the fibril creation price |
82 | * route its requests through them. To avoid paying the fibril creation price |
83 | * upon each request, FAT might want to keep the connections open after the |
83 | * upon each request, FAT might want to keep the connections open after the |
84 | * request has been completed. |
84 | * request has been completed. |
85 | */ |
85 | */ |
86 | static void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
86 | static void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
87 | { |
87 | { |
88 | if (iid) { |
88 | if (iid) { |
89 | /* |
89 | /* |
90 | * This only happens for connections opened by |
90 | * This only happens for connections opened by |
91 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
91 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
92 | * created by IPC_M_CONNECT_TO_ME. |
92 | * created by IPC_M_CONNECT_TO_ME. |
93 | */ |
93 | */ |
94 | ipc_answer_0(iid, EOK); |
94 | ipc_answer_0(iid, EOK); |
95 | } |
95 | } |
96 | 96 | ||
97 | dprintf("VFS-FAT connection established.\n"); |
97 | dprintf("VFS-FAT connection established.\n"); |
98 | while (1) { |
98 | while (1) { |
99 | ipc_callid_t callid; |
99 | ipc_callid_t callid; |
100 | ipc_call_t call; |
100 | ipc_call_t call; |
101 | 101 | ||
102 | callid = async_get_call(&call); |
102 | callid = async_get_call(&call); |
103 | switch (IPC_GET_METHOD(call)) { |
103 | switch (IPC_GET_METHOD(call)) { |
104 | case VFS_REGISTER: |
104 | case VFS_REGISTER: |
105 | ipc_answer_0(callid, EOK); |
105 | ipc_answer_0(callid, EOK); |
106 | break; |
106 | break; |
107 | case VFS_LOOKUP: |
107 | case VFS_LOOKUP: |
108 | fat_lookup(callid, &call); |
108 | fat_lookup(callid, &call); |
109 | break; |
109 | break; |
110 | default: |
110 | default: |
111 | ipc_answer_0(callid, ENOTSUP); |
111 | ipc_answer_0(callid, ENOTSUP); |
112 | break; |
112 | break; |
113 | } |
113 | } |
114 | } |
114 | } |
115 | } |
115 | } |
116 | 116 | ||
117 | int block_read(int dev_handle, unsigned long blkno, void *buf) |
- | |
118 | { |
- | |
119 | } |
- | |
120 | - | ||
121 | int main(int argc, char **argv) |
117 | int main(int argc, char **argv) |
122 | { |
118 | { |
123 | int vfs_phone; |
119 | int vfs_phone; |
124 | 120 | ||
125 | printf("FAT: HelenOS FAT file system server.\n"); |
121 | printf("FAT: HelenOS FAT file system server.\n"); |
126 | 122 | ||
127 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
123 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
128 | while (vfs_phone < EOK) { |
124 | while (vfs_phone < EOK) { |
129 | usleep(10000); |
125 | usleep(10000); |
130 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
126 | vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0); |
131 | } |
127 | } |
132 | 128 | ||
133 | int rc; |
129 | int rc; |
134 | rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection); |
130 | rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection); |
135 | if (rc != EOK) { |
131 | if (rc != EOK) { |
136 | printf("Failed to register the FAT file system (%d)\n", rc); |
132 | printf("Failed to register the FAT file system (%d)\n", rc); |
137 | return rc; |
133 | return rc; |
138 | } |
134 | } |
139 | 135 | ||
140 | dprintf("FAT filesystem registered, fs_handle=%d.\n", fat_reg.fs_handle); |
136 | dprintf("FAT filesystem registered, fs_handle=%d.\n", |
- | 137 | fat_reg.fs_handle); |
|
141 | 138 | ||
142 | async_manager(); |
139 | async_manager(); |
143 | /* not reached */ |
140 | /* not reached */ |
144 | return 0; |
141 | return 0; |
145 | } |
142 | } |
146 | 143 | ||
147 | /** |
144 | /** |
148 | * @} |
145 | * @} |
149 | */ |
146 | */ |
150 | 147 |