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39 | #include <ipc/ipc.h> |
39 | #include <ipc/ipc.h> |
40 | #include <ipc/services.h> |
40 | #include <ipc/services.h> |
41 | #include <async.h> |
41 | #include <async.h> |
42 | #include <errno.h> |
42 | #include <errno.h> |
43 | #include <unistd.h> |
43 | #include <unistd.h> |
44 | #include <stdio.h>> |
44 | #include <stdio.h> |
45 | #include "../../vfs/vfs.h" |
45 | #include "../../vfs/vfs.h" |
46 | 46 | ||
47 | #define dprintf(...) printf(__VA_ARGS__) |
47 | #define dprintf(...) printf(__VA_ARGS__) |
48 | 48 | ||
49 | vfs_info_t fat_vfs_info = { |
49 | vfs_info_t fat_vfs_info = { |
Line 60... | Line 60... | ||
60 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL, |
60 | [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL, |
61 | [IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT |
61 | [IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT |
62 | } |
62 | } |
63 | }; |
63 | }; |
64 | 64 | ||
65 | /* |
65 | /** |
66 | * This fibril processes request from the VFS server. |
66 | * This connection fibril processes VFS requests from VFS. |
- | 67 | * |
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- | 68 | * In order to support simultaneous VFS requests, our design is as follows. |
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- | 69 | * The connection fibril accepts VFS requests from VFS. If there is only one |
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- | 70 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
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- | 71 | * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO |
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- | 72 | * call. In that case, a new connection fibril will be created, which in turn |
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- | 73 | * will accept the call. Thus, a new phone will be opened for VFS. |
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- | 74 | * |
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- | 75 | * There are few issues with this arrangement. First, VFS can run out of |
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- | 76 | * available phones. In that case, VFS can close some other phones or use one |
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- | 77 | * phone for more serialized requests. Similarly, FAT can refuse to duplicate |
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- | 78 | * the connection. VFS should then just make use of already existing phones and |
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- | 79 | * route its requests through them. To avoid paying the fibril creation price |
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- | 80 | * upon each request, FAT might want to keep the connections open after the |
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- | 81 | * request has been completed. |
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67 | */ |
82 | */ |
68 | void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
83 | static void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
69 | { |
84 | { |
- | 85 | if (iid) { |
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- | 86 | /* |
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- | 87 | * This only happens for connections opened by |
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- | 88 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
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- | 89 | * created by IPC_M_CONNECT_TO_ME. |
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- | 90 | */ |
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- | 91 | ipc_answer_fast(iid, EOK, 0, 0); |
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- | 92 | } |
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- | 93 | ||
70 | dprintf("Callback connection established.\n"); |
94 | dprintf("VFS-FAT connection established.\n"); |
71 | while (1) { |
95 | while (1) { |
72 | ipc_callid_t callid; |
96 | ipc_callid_t callid; |
73 | ipc_call_t call; |
97 | ipc_call_t call; |
74 | 98 | ||
75 | callid = async_get_call(&call); |
99 | callid = async_get_call(&call); |
- | 100 | switch (IPC_GET_METHOD(call)) { |
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- | 101 | default: |
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76 | ipc_answer_fast(callid, ENOTSUP, 0, 0); |
102 | ipc_answer_fast(callid, ENOTSUP, 0, 0); |
- | 103 | break; |
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- | 104 | } |
|
77 | } |
105 | } |
78 | } |
106 | } |
79 | 107 | ||
80 | int main(int argc, char **argv) |
108 | int main(int argc, char **argv) |
81 | { |
109 | { |
Line 110... | Line 138... | ||
110 | * Ask VFS for callback connection. |
138 | * Ask VFS for callback connection. |
111 | */ |
139 | */ |
112 | ipcarg_t phonehash; |
140 | ipcarg_t phonehash; |
113 | ipc_connect_to_me(vfs_phone, 0, 0, &phonehash); |
141 | ipc_connect_to_me(vfs_phone, 0, 0, &phonehash); |
114 | 142 | ||
- | 143 | /* |
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- | 144 | * Create a connection fibril to handle the callback connection. |
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- | 145 | */ |
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115 | async_new_connection(phonehash, 0, NULL, fat_connection); |
146 | async_new_connection(phonehash, 0, NULL, fat_connection); |
- | 147 | ||
- | 148 | /* |
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- | 149 | * Tell the async framework that other connections are to be handled by |
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- | 150 | * the same connection fibril as well. |
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- | 151 | */ |
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- | 152 | async_set_client_connection(fat_connection); |
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116 | 153 | ||
117 | /* |
154 | /* |
118 | * Pick up the answer for the request to the VFS_REQUEST call. |
155 | * Pick up the answer for the request to the VFS_REQUEST call. |
119 | */ |
156 | */ |
120 | async_wait_for(req, NULL); |
157 | async_wait_for(req, NULL); |
121 | dprintf("FAT filesystem registered.\n"); |
158 | dprintf("FAT filesystem registered.\n"); |
122 | 159 | ||
- | 160 | async_create_manager(); |
|
- | 161 | ||
123 | /* |
162 | /* |
124 | * TODO: Interestingly, if we merely return, the only thread dies. |
163 | * TODO: Interestingly, if we merely return, the only thread dies. |
125 | * If the only thread dies, the whole task is destroyed. |
164 | * If the only thread dies, the whole task is destroyed. |
126 | * Prevent the thread from exiting when there are active fibrils. |
165 | * Prevent the thread from exiting when there are active fibrils. |
127 | */ |
166 | */ |
128 | fibril_schedule_next_adv(FIBRIL_FROM_DEAD); |
167 | fibril_schedule_next_adv(FIBRIL_FROM_DEAD); |
129 | /* not reached */ |
168 | /* not reached */ |
130 | 169 | ||
131 | return 0; |
170 | return 0; |