Rev 4420 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4419 | trochtova | 1 | /* |
| 2 | * Copyright (c) 2008 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | /** @addtogroup fs |
||
| 30 | * @{ |
||
| 31 | */ |
||
| 32 | |||
| 33 | /** |
||
| 34 | * @file vfs.c |
||
| 35 | * @brief VFS service for HelenOS. |
||
| 36 | */ |
||
| 37 | |||
| 38 | #include <ipc/ipc.h> |
||
| 39 | #include <ipc/services.h> |
||
| 40 | #include <async.h> |
||
| 41 | #include <errno.h> |
||
| 42 | #include <stdio.h> |
||
| 43 | #include <bool.h> |
||
| 44 | #include <string.h> |
||
| 45 | #include <as.h> |
||
| 46 | #include <libadt/list.h> |
||
| 47 | #include <atomic.h> |
||
| 48 | #include "vfs.h" |
||
| 49 | |||
| 50 | #define NAME "vfs" |
||
| 51 | |||
| 52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
||
| 53 | { |
||
| 54 | bool keep_on_going = true; |
||
| 55 | |||
| 56 | /* |
||
| 57 | * The connection was opened via the IPC_CONNECT_ME_TO call. |
||
| 58 | * This call needs to be answered. |
||
| 59 | */ |
||
| 60 | ipc_answer_0(iid, EOK); |
||
| 61 | |||
| 62 | /* |
||
| 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 |
||
| 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 |
||
| 67 | * by the client is equivalent to client termination because we cannot |
||
| 68 | * distinguish one from the other. On the other hand, the client can |
||
| 69 | * hang up arbitrarily if it has no open files and reestablish the |
||
| 70 | * connection later. |
||
| 71 | */ |
||
| 72 | while (keep_on_going) { |
||
| 73 | ipc_call_t call; |
||
| 74 | ipc_callid_t callid = async_get_call(&call); |
||
| 75 | |||
| 76 | fs_handle_t fs_handle; |
||
| 77 | int phone; |
||
| 78 | |||
| 79 | switch (IPC_GET_METHOD(call)) { |
||
| 80 | case IPC_M_PHONE_HUNGUP: |
||
| 81 | keep_on_going = false; |
||
| 82 | break; |
||
| 83 | case IPC_M_CONNECT_ME_TO: |
||
| 84 | /* |
||
| 85 | * Connect the client file system to another one. |
||
| 86 | */ |
||
| 87 | /* FIXME: |
||
| 88 | * Prevent ordinary clients from connecting to file |
||
| 89 | * system servers directly. This should be solved by |
||
| 90 | * applying some security mechanisms. |
||
| 91 | */ |
||
| 92 | fs_handle = IPC_GET_ARG1(call); |
||
| 93 | phone = vfs_grab_phone(fs_handle); |
||
| 94 | (void) ipc_forward_fast(callid, phone, 0, 0, 0, |
||
| 95 | IPC_FF_NONE); |
||
| 96 | vfs_release_phone(phone); |
||
| 97 | break; |
||
| 98 | case VFS_REGISTER: |
||
| 99 | vfs_register(callid, &call); |
||
| 100 | /* |
||
| 101 | * Keep the connection open so that a file system can |
||
| 102 | * later ask us to connect it to another file system. |
||
| 103 | * This is necessary to support non-root mounts. |
||
| 104 | */ |
||
| 105 | break; |
||
| 106 | case VFS_MOUNT: |
||
| 107 | vfs_mount(callid, &call); |
||
| 108 | break; |
||
| 109 | case VFS_OPEN: |
||
| 110 | vfs_open(callid, &call); |
||
| 111 | break; |
||
| 112 | case VFS_CLOSE: |
||
| 113 | vfs_close(callid, &call); |
||
| 114 | break; |
||
| 115 | case VFS_READ: |
||
| 116 | vfs_read(callid, &call); |
||
| 117 | break; |
||
| 118 | case VFS_WRITE: |
||
| 119 | vfs_write(callid, &call); |
||
| 120 | break; |
||
| 121 | case VFS_SEEK: |
||
| 122 | vfs_seek(callid, &call); |
||
| 123 | break; |
||
| 124 | case VFS_TRUNCATE: |
||
| 125 | vfs_truncate(callid, &call); |
||
| 126 | break; |
||
| 127 | case VFS_MKDIR: |
||
| 128 | vfs_mkdir(callid, &call); |
||
| 129 | break; |
||
| 130 | case VFS_UNLINK: |
||
| 131 | vfs_unlink(callid, &call); |
||
| 132 | break; |
||
| 133 | case VFS_RENAME: |
||
| 134 | vfs_rename(callid, &call); |
||
| 135 | break; |
||
| 136 | default: |
||
| 137 | ipc_answer_0(callid, ENOTSUP); |
||
| 138 | break; |
||
| 139 | } |
||
| 140 | } |
||
| 141 | |||
| 142 | /* TODO: cleanup after the client */ |
||
| 143 | } |
||
| 144 | |||
| 145 | int main(int argc, char **argv) |
||
| 146 | { |
||
| 147 | printf(NAME ": HelenOS VFS server\n"); |
||
| 148 | |||
| 149 | /* |
||
| 150 | * Initialize the list of registered file systems. |
||
| 151 | */ |
||
| 152 | list_initialize(&fs_head); |
||
| 153 | |||
| 154 | /* |
||
| 155 | * Initialize VFS node hash table. |
||
| 156 | */ |
||
| 157 | if (!vfs_nodes_init()) { |
||
| 158 | printf(NAME ": Failed to initialize VFS node hash table\n"); |
||
| 159 | return ENOMEM; |
||
| 160 | } |
||
| 161 | |||
| 162 | /* |
||
| 163 | * Allocate and initialize the Path Lookup Buffer. |
||
| 164 | */ |
||
| 165 | list_initialize(&plb_head); |
||
| 166 | plb = as_get_mappable_page(PLB_SIZE); |
||
| 167 | if (!plb) { |
||
| 168 | printf(NAME ": Cannot allocate a mappable piece of address space\n"); |
||
| 169 | return ENOMEM; |
||
| 170 | } |
||
| 171 | |||
| 172 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE | |
||
| 173 | AS_AREA_CACHEABLE) != plb) { |
||
| 174 | printf(NAME ": Cannot create address space area\n"); |
||
| 175 | return ENOMEM; |
||
| 176 | } |
||
| 177 | memset(plb, 0, PLB_SIZE); |
||
| 178 | |||
| 179 | /* |
||
| 180 | * Set a connectio handling function/fibril. |
||
| 181 | */ |
||
| 182 | async_set_client_connection(vfs_connection); |
||
| 183 | |||
| 184 | /* |
||
| 185 | * Register at the naming service. |
||
| 186 | */ |
||
| 187 | ipcarg_t phonead; |
||
| 188 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead); |
||
| 189 | |||
| 190 | /* |
||
| 191 | * Start accepting connections. |
||
| 192 | */ |
||
| 193 | printf(NAME ": Accepting connections\n"); |
||
| 194 | async_manager(); |
||
| 195 | return 0; |
||
| 196 | } |
||
| 197 | |||
| 198 | /** |
||
| 199 | * @} |
||
| 200 | */ |