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| Rev | Author | Line No. | Line |
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| 2645 | jermar | 1 | /* |
| 2 | * Copyright (c) 2006 Martin Decky |
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| 2690 | jermar | 3 | * Copyright (c) 2008 Jakub Jermar |
| 2645 | jermar | 4 | * All rights reserved. |
| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer in the |
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| 14 | * documentation and/or other materials provided with the distribution. |
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| 15 | * - The name of the author may not be used to endorse or promote products |
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| 16 | * derived from this software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |||
| 30 | /** @addtogroup fs |
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| 31 | * @{ |
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| 32 | */ |
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| 33 | |||
| 34 | /** |
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| 35 | * @file tmpfs.c |
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| 36 | * @brief File system driver for in-memory file system. |
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| 37 | * |
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| 38 | * Every instance of tmpfs exists purely in memory and has neither a disk layout |
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| 39 | * nor any permanent storage (e.g. disk blocks). With each system reboot, data |
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| 40 | * stored in a tmpfs file system is lost. |
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| 41 | */ |
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| 42 | |||
| 43 | #include "tmpfs.h" |
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| 44 | #include <ipc/ipc.h> |
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| 45 | #include <ipc/services.h> |
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| 46 | #include <async.h> |
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| 47 | #include <errno.h> |
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| 48 | #include <unistd.h> |
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| 49 | #include <stdio.h> |
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| 50 | #include <libfs.h> |
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| 51 | #include "../../vfs/vfs.h" |
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| 52 | |||
| 3150 | svoboda | 53 | #define NAME "tmpfs" |
| 2645 | jermar | 54 | |
| 3150 | svoboda | 55 | |
| 2645 | jermar | 56 | vfs_info_t tmpfs_vfs_info = { |
| 57 | .name = "tmpfs", |
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| 58 | }; |
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| 59 | |||
| 60 | fs_reg_t tmpfs_reg; |
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| 61 | |||
| 62 | /** |
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| 63 | * This connection fibril processes VFS requests from VFS. |
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| 64 | * |
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| 65 | * In order to support simultaneous VFS requests, our design is as follows. |
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| 66 | * The connection fibril accepts VFS requests from VFS. If there is only one |
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| 67 | * instance of the fibril, VFS will need to serialize all VFS requests it sends |
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| 68 | * to FAT. To overcome this bottleneck, VFS can send TMPFS the |
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| 69 | * IPC_M_CONNECT_ME_TO call. In that case, a new connection fibril will be |
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| 70 | * created, which in turn will accept the call. Thus, a new phone will be |
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| 71 | * opened for VFS. |
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| 72 | * |
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| 73 | * There are few issues with this arrangement. First, VFS can run out of |
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| 74 | * available phones. In that case, VFS can close some other phones or use one |
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| 75 | * phone for more serialized requests. Similarily, TMPFS can refuse to duplicate |
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| 76 | * the connection. VFS should then just make use of already existing phones and |
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| 77 | * route its requests through them. To avoid paying the fibril creation price |
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| 78 | * upon each request, TMPFS might want to keep the connections open after the |
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| 79 | * request has been completed. |
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| 80 | */ |
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| 81 | static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
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| 82 | { |
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| 83 | if (iid) { |
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| 84 | /* |
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| 85 | * This only happens for connections opened by |
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| 86 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
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| 87 | * created by IPC_M_CONNECT_TO_ME. |
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| 88 | */ |
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| 89 | ipc_answer_0(iid, EOK); |
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| 90 | } |
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| 91 | |||
| 92 | dprintf("VFS-TMPFS connection established.\n"); |
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| 93 | while (1) { |
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| 94 | ipc_callid_t callid; |
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| 95 | ipc_call_t call; |
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| 96 | |||
| 97 | callid = async_get_call(&call); |
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| 98 | switch (IPC_GET_METHOD(call)) { |
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| 4691 | svoboda | 99 | case IPC_M_PHONE_HUNGUP: |
| 100 | return; |
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| 101 | case VFS_OUT_MOUNTED: |
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| 3153 | svoboda | 102 | tmpfs_mounted(callid, &call); |
| 103 | break; |
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| 4691 | svoboda | 104 | case VFS_OUT_MOUNT: |
| 3009 | svoboda | 105 | tmpfs_mount(callid, &call); |
| 106 | break; |
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| 4691 | svoboda | 107 | case VFS_OUT_LOOKUP: |
| 2645 | jermar | 108 | tmpfs_lookup(callid, &call); |
| 109 | break; |
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| 4691 | svoboda | 110 | case VFS_OUT_READ: |
| 2658 | jermar | 111 | tmpfs_read(callid, &call); |
| 112 | break; |
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| 4691 | svoboda | 113 | case VFS_OUT_WRITE: |
| 2710 | jermar | 114 | tmpfs_write(callid, &call); |
| 115 | break; |
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| 4691 | svoboda | 116 | case VFS_OUT_TRUNCATE: |
| 2731 | jermar | 117 | tmpfs_truncate(callid, &call); |
| 118 | break; |
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| 4691 | svoboda | 119 | case VFS_OUT_CLOSE: |
| 120 | tmpfs_close(callid, &call); |
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| 121 | break; |
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| 122 | case VFS_OUT_DESTROY: |
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| 2742 | jermar | 123 | tmpfs_destroy(callid, &call); |
| 2731 | jermar | 124 | break; |
| 4691 | svoboda | 125 | case VFS_OUT_OPEN_NODE: |
| 126 | tmpfs_open_node(callid, &call); |
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| 127 | break; |
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| 128 | case VFS_OUT_STAT: |
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| 129 | tmpfs_stat(callid, &call); |
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| 130 | break; |
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| 131 | case VFS_OUT_SYNC: |
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| 132 | tmpfs_sync(callid, &call); |
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| 133 | break; |
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| 2645 | jermar | 134 | default: |
| 135 | ipc_answer_0(callid, ENOTSUP); |
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| 136 | break; |
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| 137 | } |
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| 138 | } |
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| 139 | } |
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| 140 | |||
| 141 | int main(int argc, char **argv) |
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| 142 | { |
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| 3150 | svoboda | 143 | printf(NAME ": HelenOS TMPFS file system server\n"); |
| 4348 | svoboda | 144 | |
| 145 | if (!tmpfs_init()) { |
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| 146 | printf(NAME ": failed to initialize TMPFS\n"); |
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| 147 | return -1; |
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| 148 | } |
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| 149 | |||
| 4345 | svoboda | 150 | int vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0); |
| 151 | if (vfs_phone < EOK) { |
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| 152 | printf(NAME ": Unable to connect to VFS\n"); |
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| 153 | return -1; |
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| 2645 | jermar | 154 | } |
| 4691 | svoboda | 155 | |
| 4345 | svoboda | 156 | int rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info, |
| 2645 | jermar | 157 | tmpfs_connection); |
| 158 | if (rc != EOK) { |
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| 3150 | svoboda | 159 | printf(NAME ": Failed to register file system (%d)\n", rc); |
| 2645 | jermar | 160 | return rc; |
| 161 | } |
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| 4348 | svoboda | 162 | |
| 3150 | svoboda | 163 | printf(NAME ": Accepting connections\n"); |
| 2645 | jermar | 164 | async_manager(); |
| 165 | /* not reached */ |
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| 166 | return 0; |
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| 167 | } |
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| 168 | |||
| 169 | /** |
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| 170 | * @} |
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| 171 | */ |