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  1. /*
  2.  * Copyright (c) 2006 Martin Decky
  3.  * Copyright (c) 2007 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup fs
  31.  * @{
  32.  */
  33.  
  34. /**
  35.  * @file    fat.c
  36.  * @brief   FAT file system driver for HelenOS.
  37.  */
  38.  
  39. #include <ipc/ipc.h>
  40. #include <ipc/services.h>
  41. #include <async.h>
  42. #include <errno.h>
  43. #include <unistd.h>
  44. #include <stdio.h>>
  45. #include "../../vfs/vfs.h"
  46.  
  47. #define dprintf(...)    printf(__VA_ARGS__)
  48.  
  49. vfs_info_t fat_vfs_info = {
  50.     .name = "fat",
  51.     .ops = {
  52.         [IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] = VFS_OP_DEFINED,
  53.         [IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED,
  54.         [IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_DEFINED,
  55.         [IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED,
  56.         [IPC_METHOD_TO_VFS_OP(VFS_OPEN)] = VFS_OP_DEFINED,
  57.         [IPC_METHOD_TO_VFS_OP(VFS_CREATE)] = VFS_OP_DEFINED,
  58.         [IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] = VFS_OP_DEFINED,
  59.         [IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED,
  60.         [IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_NULL,
  61.         [IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT
  62.     }
  63. };
  64.  
  65. /*
  66.  * This fibril processes request from the VFS server.
  67.  */
  68. void fat_connection(ipc_callid_t iid, ipc_call_t *icall)
  69. {
  70.     dprintf("Callback connection established.\n");
  71.     while (1) {
  72.         ipc_callid_t callid;
  73.         ipc_call_t call;
  74.    
  75.         callid = async_get_call(&call);
  76.         ipc_answer_fast(callid, ENOTSUP, 0, 0);
  77.     }
  78. }
  79.  
  80. int main(int argc, char **argv)
  81. {
  82.     int vfs_phone;
  83.  
  84.     printf("FAT: HelenOS FAT file system server.\n");
  85.  
  86.     vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0);
  87.     while (vfs_phone < EOK) {
  88.         usleep(10000);
  89.         vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0);
  90.     }
  91.    
  92.     /*
  93.      * Tell VFS that we are here and want to get registered.
  94.      * We use the async framework because VFS will answer the request
  95.      * out-of-order, when it knows that the operation succeeded or failed.
  96.      */
  97.     ipc_call_t answer;
  98.     aid_t req = async_send_2(vfs_phone, VFS_REGISTER, 0, 0, &answer);
  99.  
  100.     /*
  101.      * Send our VFS info structure to VFS.
  102.      */
  103.     int rc = ipc_data_send(vfs_phone, &fat_vfs_info, sizeof(fat_vfs_info));
  104.     if (rc != EOK) {
  105.         async_wait_for(req, NULL);
  106.         return rc;
  107.     }
  108.  
  109.     /*
  110.      * Ask VFS for callback connection.
  111.      */
  112.     ipcarg_t phonehash;
  113.     ipc_connect_to_me(vfs_phone, 0, 0, &phonehash);
  114.  
  115.     async_new_connection(phonehash, 0, NULL, fat_connection);
  116.  
  117.     /*
  118.      * Pick up the answer for the request to the VFS_REQUEST call.
  119.      */
  120.     async_wait_for(req, NULL);
  121.     dprintf("FAT filesystem registered.\n");
  122.  
  123.     /*
  124.      * TODO: Interestingly, if we merely return, the only thread dies.
  125.      *       If the only thread dies, the whole task is destroyed.
  126.      *       Prevent the thread from exiting when there are active fibrils.
  127.      */
  128.     fibril_schedule_next_adv(FIBRIL_FROM_DEAD);
  129.     /* not reached */
  130.  
  131.     return 0;
  132. }
  133.  
  134. /**
  135.  * @}
  136.  */
  137.