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2518 | jermar | 1 | /* |
2 | * Copyright (c) 2007 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 multiplexer for HelenOS. |
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36 | */ |
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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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42 | #include "vfs.h" |
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43 | |||
2521 | jermar | 44 | static void vfs_register(ipc_callid_t iid, ipc_call_t *icall) |
45 | { |
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46 | ipc_callid_t callid; |
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47 | ipc_call_t call; |
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48 | |||
49 | callid = async_get_call(&call); |
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50 | if (IPC_GET_METHOD(call) == IPC_M_DATA_SEND) { |
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51 | size_t size = IPC_GET_ARG3(call); |
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52 | if (size != sizeof(vfs_info_t)) { |
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53 | /* |
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54 | * The client is sending us something, which cannot be |
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55 | * the info structure. |
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56 | */ |
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57 | ipc_answer_fast(iid, EINVAL, 0, 0); |
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58 | ipc_answer_fast(callid, EINVAL, 0, 0); |
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59 | return; |
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60 | } |
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61 | /* |
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62 | * XXX: continue here |
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63 | * Allocate an info structue, answer the call, check sanity |
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64 | * of the copied-in info structure, ... |
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65 | */ |
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66 | } else { |
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67 | /* |
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68 | * The client doesn't obey the same protocol as we do. |
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69 | */ |
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70 | ipc_answer_fast(iid, EINVAL, 0, 0); |
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71 | ipc_answer_fast(callid, EINVAL, 0, 0); |
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72 | return; |
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73 | } |
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74 | } |
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75 | |||
2520 | jermar | 76 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
77 | { |
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78 | ipcarg_t iarg1, iarg2; |
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79 | |||
80 | /* |
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81 | * The connection was opened via the IPC_CONNECT_ME_TO call. |
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82 | * This call needs to be answered. |
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83 | * |
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84 | * The protocol is that the requested action is specified in ARG1 |
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85 | * of the opening call. If the request has a single integer argument, |
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86 | * it is passed in ARG2. |
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87 | */ |
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88 | iarg1 = IPC_GET_ARG1(*icall); |
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89 | iarg2 = IPC_GET_ARG2(*icall); |
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90 | |||
91 | /* |
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92 | * Now, the connection can either be from an individual FS, |
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93 | * which is trying to register itself and pass us its capabilities. |
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94 | * Or, the connection is a regular connection from a client that wants |
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95 | * us to do something for it (e.g. open a file, mount a fs etc.). |
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96 | */ |
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97 | switch (iarg1) { |
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98 | case VFS_REGISTER: |
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2521 | jermar | 99 | vfs_register(iid, icall); |
100 | break; |
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2520 | jermar | 101 | case VFS_MOUNT: |
102 | case VFS_UNMOUNT: |
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103 | case VFS_OPEN: |
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104 | default: |
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105 | ipc_answer_fast(iid, ENOTSUP, 0, 0); |
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106 | break; |
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107 | } |
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108 | } |
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109 | |||
2518 | jermar | 110 | int main(int argc, char **argv) |
111 | { |
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2520 | jermar | 112 | ipcarg_t phonead; |
113 | |||
114 | async_set_client_connection(vfs_connection); |
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115 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead); |
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116 | async_manager(); |
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2518 | jermar | 117 | return 0; |
118 | } |
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119 | |||
120 | /** |
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121 | * @} |
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122 | */ |