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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 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 "vfs.h"
  48.  
  49. #define dprintf(...)    printf(__VA_ARGS__)
  50.  
  51. static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
  52. {
  53.     bool keep_on_going = 1;
  54.  
  55.     printf("Connection opened from %p\n", icall->in_phone_hash);
  56.  
  57.     /*
  58.      * The connection was opened via the IPC_CONNECT_ME_TO call.
  59.      * This call needs to be answered.
  60.      */
  61.     ipc_answer_fast(iid, EOK, 0, 0);
  62.  
  63.     /*
  64.      * Here we enter the main connection fibril loop.
  65.      * The logic behind this loop and the protocol is that we'd like to keep
  66.      * each connection open for a while before we close it. The benefit of
  67.      * this is that the client doesn't have to establish a new connection
  68.      * upon each request.  On the other hand, the client must be ready to
  69.      * re-establish a connection if we hang it up due to reaching of maximum
  70.      * number of requests per connection or due to the client timing out.
  71.      */
  72.      
  73.     while (keep_on_going) {
  74.         ipc_callid_t callid;
  75.         ipc_call_t call;
  76.  
  77.         callid = async_get_call(&call);
  78.  
  79.         printf("Received call, method=%d\n", IPC_GET_METHOD(call));
  80.        
  81.         switch (IPC_GET_METHOD(call)) {
  82.         case IPC_M_PHONE_HUNGUP:
  83.             keep_on_going = false;
  84.             break;
  85.         case VFS_REGISTER:
  86.             vfs_register(callid, &call);
  87.             keep_on_going = false;
  88.             break;
  89.         case VFS_MOUNT:
  90.         case VFS_UNMOUNT:
  91.         case VFS_OPEN:
  92.         case VFS_CREATE:
  93.         case VFS_CLOSE:
  94.         case VFS_READ:
  95.         case VFS_WRITE:
  96.         case VFS_SEEK:
  97.         default:
  98.             ipc_answer_fast(callid, ENOTSUP, 0, 0);
  99.             break;
  100.         }
  101.     }
  102.  
  103.     /* TODO: cleanup after the client */
  104.    
  105. }
  106.  
  107. int main(int argc, char **argv)
  108. {
  109.     ipcarg_t phonead;
  110.  
  111.     printf("VFS: HelenOS VFS server\n");
  112.  
  113.     /*
  114.      * Initialize the list of registered file systems.
  115.      */
  116.     list_initialize(&fs_head);
  117.  
  118.     /*
  119.      * Allocate and initialize the Path Lookup Buffer.
  120.      */
  121.     list_initialize(&plb_head);
  122.     plb = as_get_mappable_page(PLB_SIZE);
  123.     if (!plb) {
  124.         printf("Cannot allocate a mappable piece of address space\n");
  125.         return ENOMEM;
  126.     }
  127.     if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
  128.         AS_AREA_CACHEABLE) != plb) {
  129.         printf("Cannot create address space area.\n");
  130.         return ENOMEM;
  131.     }
  132.     memset(plb, 0, PLB_SIZE);
  133.    
  134.     /*
  135.      * Set a connectio handling function/fibril.
  136.      */
  137.     async_set_client_connection(vfs_connection);
  138.  
  139.     /*
  140.      * Register at the naming service.
  141.      */
  142.     ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);
  143.  
  144.     /*
  145.      * Start accepting connections.
  146.      */
  147.     async_manager();
  148.     return 0;
  149. }
  150.  
  151. /**
  152.  * @}
  153.  */
  154.