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  1. /*
  2.  * Copyright (c) 2007 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 multiplexer for HelenOS.
  36.  */
  37.  
  38. #include <ipc/ipc.h>
  39. #include <ipc/services.h>
  40. #include <async.h>
  41. #include <errno.h>
  42. #include "vfs.h"
  43.  
  44. static void vfs_register(ipc_callid_t iid, ipc_call_t *icall)
  45. {
  46.     ipc_callid_t callid;
  47.     ipc_call_t call;
  48.  
  49.     callid = async_get_call(&call);
  50.     if (IPC_GET_METHOD(call) == IPC_M_DATA_SEND) {
  51.         size_t size = IPC_GET_ARG3(call);
  52.         if (size != sizeof(vfs_info_t)) {
  53.             /*
  54.              * The client is sending us something, which cannot be
  55.              * the info structure.
  56.              */
  57.             ipc_answer_fast(iid, EINVAL, 0, 0);
  58.             ipc_answer_fast(callid, EINVAL, 0, 0);
  59.             return;
  60.         }
  61.         /*
  62.          * XXX: continue here
  63.          * Allocate an info structue, answer the call, check sanity
  64.          * of the copied-in info structure, ...
  65.          */
  66.     } else {
  67.         /*
  68.          * The client doesn't obey the same protocol as we do.
  69.          */
  70.         ipc_answer_fast(iid, EINVAL, 0, 0);
  71.         ipc_answer_fast(callid, EINVAL, 0, 0);
  72.         return;
  73.     }
  74. }
  75.  
  76. static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
  77. {
  78.     ipcarg_t iarg1, iarg2;
  79.  
  80.     /*
  81.      * The connection was opened via the IPC_CONNECT_ME_TO call.
  82.      * This call needs to be answered.
  83.      *
  84.      * The protocol is that the requested action is specified in ARG1
  85.      * of the opening call. If the request has a single integer argument,
  86.      * it is passed in ARG2.
  87.      */
  88.     iarg1 = IPC_GET_ARG1(*icall);
  89.     iarg2 = IPC_GET_ARG2(*icall);
  90.  
  91.     /*
  92.      * Now, the connection can either be from an individual FS,
  93.      * which is trying to register itself and pass us its capabilities.
  94.      * Or, the connection is a regular connection from a client that wants
  95.      * us to do something for it (e.g. open a file, mount a fs etc.).
  96.      */
  97.     switch (iarg1) {
  98.     case VFS_REGISTER:
  99.         vfs_register(iid, icall);
  100.         break;
  101.     case VFS_MOUNT:
  102.     case VFS_UNMOUNT:
  103.     case VFS_OPEN:
  104.     default:
  105.         ipc_answer_fast(iid, ENOTSUP, 0, 0);
  106.         break;
  107.     }
  108. }
  109.  
  110. int main(int argc, char **argv)
  111. {
  112.     ipcarg_t phonead;
  113.  
  114.     async_set_client_connection(vfs_connection);
  115.     ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);
  116.     async_manager();
  117.     return 0;
  118. }
  119.  
  120. /**
  121.  * @}
  122.  */
  123.