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2518 | jermar | 1 | /* |
2693 | jermar | 2 | * Copyright (c) 2008 Jakub Jermar |
2518 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup fs |
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30 | * @{ |
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4010 | decky | 31 | */ |
2518 | jermar | 32 | |
33 | /** |
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4010 | decky | 34 | * @file vfs.c |
35 | * @brief VFS service for HelenOS. |
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2518 | jermar | 36 | */ |
37 | |||
2520 | jermar | 38 | #include <ipc/ipc.h> |
39 | #include <ipc/services.h> |
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40 | #include <async.h> |
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41 | #include <errno.h> |
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2532 | jermar | 42 | #include <stdio.h> |
2523 | jermar | 43 | #include <bool.h> |
2542 | jermar | 44 | #include <string.h> |
45 | #include <as.h> |
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2526 | jermar | 46 | #include <libadt/list.h> |
2552 | jermar | 47 | #include <atomic.h> |
2520 | jermar | 48 | #include "vfs.h" |
49 | |||
3079 | decky | 50 | #define NAME "vfs" |
51 | |||
2520 | jermar | 52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
53 | { |
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4010 | decky | 54 | bool keep_on_going = true; |
4406 | jermar | 55 | |
2520 | jermar | 56 | /* |
57 | * The connection was opened via the IPC_CONNECT_ME_TO call. |
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58 | * This call needs to be answered. |
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59 | */ |
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2619 | jermar | 60 | ipc_answer_0(iid, EOK); |
4010 | decky | 61 | |
2520 | jermar | 62 | /* |
2523 | jermar | 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 |
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2560 | jermar | 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 |
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67 | * by the client is equivalent to client termination because we cannot |
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68 | * distinguish one from the other. On the other hand, the client can |
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69 | * hang up arbitrarily if it has no open files and reestablish the |
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70 | * connection later. |
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2520 | jermar | 71 | */ |
2523 | jermar | 72 | while (keep_on_going) { |
73 | ipc_call_t call; |
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4010 | decky | 74 | ipc_callid_t callid = async_get_call(&call); |
75 | |||
76 | fs_handle_t fs_handle; |
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3849 | jermar | 77 | int phone; |
4010 | decky | 78 | |
2523 | jermar | 79 | switch (IPC_GET_METHOD(call)) { |
80 | case IPC_M_PHONE_HUNGUP: |
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81 | keep_on_going = false; |
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82 | break; |
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83 | case VFS_REGISTER: |
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84 | vfs_register(callid, &call); |
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3847 | jermar | 85 | /* |
86 | * Keep the connection open so that a file system can |
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87 | * later ask us to connect it to another file system. |
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88 | * This is necessary to support non-root mounts. |
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89 | */ |
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2523 | jermar | 90 | break; |
91 | case VFS_MOUNT: |
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2589 | jermar | 92 | vfs_mount(callid, &call); |
93 | break; |
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94 | case VFS_OPEN: |
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95 | vfs_open(callid, &call); |
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96 | break; |
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4463 | decky | 97 | case VFS_OPEN_NODE: |
98 | vfs_open_node(callid, &call); |
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99 | break; |
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2734 | jermar | 100 | case VFS_CLOSE: |
101 | vfs_close(callid, &call); |
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102 | break; |
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2625 | jermar | 103 | case VFS_READ: |
104 | vfs_read(callid, &call); |
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105 | break; |
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2666 | jermar | 106 | case VFS_WRITE: |
107 | vfs_write(callid, &call); |
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108 | break; |
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2684 | jermar | 109 | case VFS_SEEK: |
110 | vfs_seek(callid, &call); |
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111 | break; |
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2690 | jermar | 112 | case VFS_TRUNCATE: |
2693 | jermar | 113 | vfs_truncate(callid, &call); |
114 | break; |
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2707 | jermar | 115 | case VFS_MKDIR: |
116 | vfs_mkdir(callid, &call); |
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117 | break; |
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2735 | jermar | 118 | case VFS_UNLINK: |
119 | vfs_unlink(callid, &call); |
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120 | break; |
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2763 | jermar | 121 | case VFS_RENAME: |
122 | vfs_rename(callid, &call); |
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123 | break; |
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4463 | decky | 124 | case VFS_DEVICE: |
125 | vfs_device(callid, &call); |
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126 | break; |
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127 | case VFS_SYNC: |
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128 | vfs_sync(callid, &call); |
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129 | break; |
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130 | case VFS_NODE: |
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131 | vfs_node(callid, &call); |
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132 | break; |
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2523 | jermar | 133 | default: |
2619 | jermar | 134 | ipc_answer_0(callid, ENOTSUP); |
2523 | jermar | 135 | break; |
136 | } |
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2520 | jermar | 137 | } |
4010 | decky | 138 | |
2523 | jermar | 139 | /* TODO: cleanup after the client */ |
2520 | jermar | 140 | } |
141 | |||
2518 | jermar | 142 | int main(int argc, char **argv) |
143 | { |
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3079 | decky | 144 | printf(NAME ": HelenOS VFS server\n"); |
4010 | decky | 145 | |
2542 | jermar | 146 | /* |
147 | * Initialize the list of registered file systems. |
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148 | */ |
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2526 | jermar | 149 | list_initialize(&fs_head); |
4010 | decky | 150 | |
2542 | jermar | 151 | /* |
2596 | jermar | 152 | * Initialize VFS node hash table. |
153 | */ |
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154 | if (!vfs_nodes_init()) { |
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3079 | decky | 155 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
2596 | jermar | 156 | return ENOMEM; |
157 | } |
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4010 | decky | 158 | |
2596 | jermar | 159 | /* |
2542 | jermar | 160 | * Allocate and initialize the Path Lookup Buffer. |
161 | */ |
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162 | list_initialize(&plb_head); |
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163 | plb = as_get_mappable_page(PLB_SIZE); |
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2543 | jermar | 164 | if (!plb) { |
3079 | decky | 165 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
2543 | jermar | 166 | return ENOMEM; |
167 | } |
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4010 | decky | 168 | |
2543 | jermar | 169 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
170 | AS_AREA_CACHEABLE) != plb) { |
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3079 | decky | 171 | printf(NAME ": Cannot create address space area\n"); |
2543 | jermar | 172 | return ENOMEM; |
173 | } |
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174 | memset(plb, 0, PLB_SIZE); |
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2542 | jermar | 175 | |
176 | /* |
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177 | * Set a connectio handling function/fibril. |
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178 | */ |
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4463 | decky | 179 | async_set_pending(vfs_process_pending_mount); |
2520 | jermar | 180 | async_set_client_connection(vfs_connection); |
4010 | decky | 181 | |
2542 | jermar | 182 | /* |
183 | * Register at the naming service. |
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184 | */ |
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4010 | decky | 185 | ipcarg_t phonead; |
2637 | cejka | 186 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
4010 | decky | 187 | |
2542 | jermar | 188 | /* |
189 | * Start accepting connections. |
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190 | */ |
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3079 | decky | 191 | printf(NAME ": Accepting connections\n"); |
2520 | jermar | 192 | async_manager(); |
2518 | jermar | 193 | return 0; |
194 | } |
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195 | |||
196 | /** |
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197 | * @} |
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4010 | decky | 198 | */ |