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| 4419 | trochtova | 1 | /* |
| 2 | * Copyright (c) 2008 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 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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| 31 | */ |
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| 32 | |||
| 33 | /** |
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| 34 | * @file vfs.c |
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| 35 | * @brief VFS service for HelenOS. |
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| 36 | */ |
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| 37 | |||
| 38 | #include <ipc/ipc.h> |
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| 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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| 42 | #include <stdio.h> |
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| 43 | #include <bool.h> |
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| 44 | #include <string.h> |
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| 45 | #include <as.h> |
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| 4537 | trochtova | 46 | #include <adt/list.h> |
| 4419 | trochtova | 47 | #include <atomic.h> |
| 48 | #include "vfs.h" |
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| 49 | |||
| 50 | #define NAME "vfs" |
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| 51 | |||
| 52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
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| 53 | { |
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| 54 | bool keep_on_going = true; |
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| 4420 | trochtova | 55 | |
| 4419 | trochtova | 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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| 60 | ipc_answer_0(iid, EOK); |
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| 61 | |||
| 62 | /* |
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| 63 | * Here we enter the main connection fibril loop. |
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| 64 | * The logic behind this loop and the protocol is that we'd like to keep |
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| 65 | * each connection open until the client hangs up. When the client hangs |
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| 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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| 71 | */ |
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| 72 | while (keep_on_going) { |
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| 73 | ipc_call_t call; |
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| 74 | ipc_callid_t callid = async_get_call(&call); |
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| 75 | |||
| 76 | fs_handle_t fs_handle; |
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| 77 | int phone; |
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| 78 | |||
| 79 | switch (IPC_GET_METHOD(call)) { |
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| 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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| 85 | /* |
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| 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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| 90 | break; |
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| 91 | case VFS_MOUNT: |
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| 92 | vfs_mount(callid, &call); |
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| 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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| 4537 | trochtova | 97 | case VFS_OPEN_NODE: |
| 98 | vfs_open_node(callid, &call); |
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| 99 | break; |
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| 4419 | trochtova | 100 | case VFS_CLOSE: |
| 101 | vfs_close(callid, &call); |
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| 102 | break; |
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| 103 | case VFS_READ: |
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| 104 | vfs_read(callid, &call); |
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| 105 | break; |
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| 106 | case VFS_WRITE: |
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| 107 | vfs_write(callid, &call); |
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| 108 | break; |
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| 109 | case VFS_SEEK: |
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| 110 | vfs_seek(callid, &call); |
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| 111 | break; |
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| 112 | case VFS_TRUNCATE: |
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| 113 | vfs_truncate(callid, &call); |
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| 114 | break; |
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| 115 | case VFS_MKDIR: |
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| 116 | vfs_mkdir(callid, &call); |
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| 117 | break; |
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| 118 | case VFS_UNLINK: |
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| 119 | vfs_unlink(callid, &call); |
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| 120 | break; |
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| 121 | case VFS_RENAME: |
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| 122 | vfs_rename(callid, &call); |
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| 123 | break; |
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| 4537 | trochtova | 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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| 4419 | trochtova | 133 | default: |
| 134 | ipc_answer_0(callid, ENOTSUP); |
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| 135 | break; |
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| 136 | } |
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| 137 | } |
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| 138 | |||
| 139 | /* TODO: cleanup after the client */ |
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| 140 | } |
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| 141 | |||
| 142 | int main(int argc, char **argv) |
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| 143 | { |
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| 144 | printf(NAME ": HelenOS VFS server\n"); |
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| 145 | |||
| 146 | /* |
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| 147 | * Initialize the list of registered file systems. |
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| 148 | */ |
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| 149 | list_initialize(&fs_head); |
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| 150 | |||
| 151 | /* |
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| 152 | * Initialize VFS node hash table. |
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| 153 | */ |
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| 154 | if (!vfs_nodes_init()) { |
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| 155 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
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| 156 | return ENOMEM; |
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| 157 | } |
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| 158 | |||
| 159 | /* |
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| 160 | * Allocate and initialize the Path Lookup Buffer. |
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| 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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| 164 | if (!plb) { |
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| 165 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
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| 166 | return ENOMEM; |
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| 167 | } |
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| 168 | |||
| 169 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
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| 170 | AS_AREA_CACHEABLE) != plb) { |
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| 171 | printf(NAME ": Cannot create address space area\n"); |
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| 172 | return ENOMEM; |
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| 173 | } |
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| 174 | memset(plb, 0, PLB_SIZE); |
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| 175 | |||
| 176 | /* |
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| 177 | * Set a connectio handling function/fibril. |
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| 178 | */ |
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| 4537 | trochtova | 179 | async_set_pending(vfs_process_pending_mount); |
| 4419 | trochtova | 180 | async_set_client_connection(vfs_connection); |
| 181 | |||
| 182 | /* |
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| 183 | * Register at the naming service. |
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| 184 | */ |
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| 185 | ipcarg_t phonead; |
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| 186 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
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| 187 | |||
| 188 | /* |
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| 189 | * Start accepting connections. |
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| 190 | */ |
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| 191 | printf(NAME ": Accepting connections\n"); |
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| 192 | async_manager(); |
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| 193 | return 0; |
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| 194 | } |
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| 195 | |||
| 196 | /** |
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| 197 | * @} |
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| 198 | */ |