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  1. /*
  2.  * Copyright (c) 2009 Martin Decky
  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 devfs_ops.c
  35.  * @brief Implementation of VFS operations for the devfs file system server.
  36.  */
  37.  
  38. #include <ipc/ipc.h>
  39. #include <bool.h>
  40. #include <errno.h>
  41. #include <malloc.h>
  42. #include <string.h>
  43. #include <libfs.h>
  44. #include "devfs.h"
  45. #include "devfs_ops.h"
  46.  
  47. #define PLB_GET_CHAR(pos)  (devfs_reg.plb_ro[pos % PLB_SIZE])
  48.  
  49. bool devfs_init(void)
  50. {
  51.     if (devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING) < 0)
  52.         return false;
  53.    
  54.     return true;
  55. }
  56.  
  57. void devfs_mounted(ipc_callid_t rid, ipc_call_t *request)
  58. {
  59.     /* Accept the mount options */
  60.     ipc_callid_t callid;
  61.     size_t size;
  62.     if (!ipc_data_write_receive(&callid, &size)) {
  63.         ipc_answer_0(callid, EINVAL);
  64.         ipc_answer_0(rid, EINVAL);
  65.         return;
  66.     }
  67.    
  68.     char *opts = malloc(size + 1);
  69.     if (!opts) {
  70.         ipc_answer_0(callid, ENOMEM);
  71.         ipc_answer_0(rid, ENOMEM);
  72.         return;
  73.     }
  74.    
  75.     ipcarg_t retval = ipc_data_write_finalize(callid, opts, size);
  76.     if (retval != EOK) {
  77.         ipc_answer_0(rid, retval);
  78.         free(opts);
  79.         return;
  80.     }
  81.    
  82.     free(opts);
  83.    
  84.     ipc_answer_3(rid, EOK, 0, 0, 0);
  85. }
  86.  
  87. void devfs_mount(ipc_callid_t rid, ipc_call_t *request)
  88. {
  89.     ipc_answer_0(rid, ENOTSUP);
  90. }
  91.  
  92. void devfs_lookup(ipc_callid_t rid, ipc_call_t *request)
  93. {
  94.     ipcarg_t first = IPC_GET_ARG1(*request);
  95.     ipcarg_t last = IPC_GET_ARG2(*request);
  96.     dev_handle_t dev_handle = IPC_GET_ARG3(*request);
  97.     ipcarg_t lflag = IPC_GET_ARG4(*request);
  98.     fs_index_t index = IPC_GET_ARG5(*request);
  99.    
  100.     /* Hierarchy is flat, no altroot is supported */
  101.     if (index != 0) {
  102.         ipc_answer_0(rid, ENOENT);
  103.         return;
  104.     }
  105.    
  106.     /* This is a read-only filesystem */
  107.     if ((lflag & L_CREATE) || (lflag & L_LINK) || (lflag & L_UNLINK)) {
  108.         ipc_answer_0(rid, ENOTSUP);
  109.         return;
  110.     }
  111.    
  112.     /* Eat slash */
  113.     if (PLB_GET_CHAR(first) == '/') {
  114.         first++;
  115.         first %= PLB_SIZE;
  116.     }
  117.    
  118.     if (first >= last) {
  119.         /* Root entry */
  120.         if (lflag & L_DIRECTORY)
  121.             ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, 0, 0, 0);
  122.         else
  123.             ipc_answer_0(rid, ENOENT);
  124.     } else {
  125.         if (lflag & L_FILE) {
  126.             count_t len;
  127.             if (last >= first)
  128.                 len = last - first + 1;
  129.             else
  130.                 len = first + PLB_SIZE - last + 1;
  131.            
  132.             char *name = (char *) malloc(len + 1);
  133.             if (name == NULL) {
  134.                 ipc_answer_0(rid, ENOMEM);
  135.                 return;
  136.             }
  137.            
  138.             count_t i;
  139.             for (i = 0; i < len; i++)
  140.                 name[i] = PLB_GET_CHAR(first + i);
  141.            
  142.             name[len] = 0;
  143.            
  144.             dev_handle_t handle;
  145.             if (devmap_device_get_handle(name, &handle, 0) != EOK) {
  146.                 free(name);
  147.                 ipc_answer_0(rid, ENOENT);
  148.                 return;
  149.             }
  150.            
  151.             free(name);
  152.            
  153.             ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, handle, 0, 1);
  154.         } else
  155.             ipc_answer_0(rid, ENOENT);
  156.     }
  157. }
  158.  
  159. void devfs_read(ipc_callid_t rid, ipc_call_t *request)
  160. {
  161.     fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
  162.     off_t pos = (off_t) IPC_GET_ARG3(*request);
  163.    
  164.     if (index != 0) {
  165.         ipc_answer_1(rid, ENOENT, 0);
  166.         return;
  167.     }
  168.    
  169.     /*
  170.      * Receive the read request.
  171.      */
  172.     ipc_callid_t callid;
  173.     size_t size;
  174.     if (!ipc_data_read_receive(&callid, &size)) {
  175.         ipc_answer_0(callid, EINVAL);
  176.         ipc_answer_0(rid, EINVAL);
  177.         return;
  178.     }
  179.    
  180.     size_t bytes = 0;
  181.     if (index != 0) {
  182.         (void) ipc_data_read_finalize(callid, NULL, bytes);
  183.     } else {
  184.         count_t count = devmap_device_get_count();
  185.         dev_desc_t *desc = malloc(count * sizeof(dev_desc_t));
  186.         if (desc == NULL) {
  187.             ipc_answer_0(callid, ENOENT);
  188.             ipc_answer_1(rid, ENOENT, 0);
  189.             return;
  190.         }
  191.        
  192.         count_t max = devmap_device_get_devices(count, desc);
  193.        
  194.         if (pos < max) {
  195.             ipc_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
  196.         } else {
  197.             ipc_answer_0(callid, ENOENT);
  198.             ipc_answer_1(rid, ENOENT, 0);
  199.             return;
  200.         }
  201.        
  202.         free(desc);
  203.         bytes = 1;
  204.     }
  205.    
  206.     ipc_answer_1(rid, EOK, bytes);
  207. }
  208.  
  209. void devfs_write(ipc_callid_t rid, ipc_call_t *request)
  210. {
  211.     fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
  212.     off_t pos = (off_t) IPC_GET_ARG3(*request);
  213.    
  214.     /*
  215.      * Receive the write request.
  216.      */
  217.     ipc_callid_t callid;
  218.     size_t size;
  219.     if (!ipc_data_write_receive(&callid, &size)) {
  220.         ipc_answer_0(callid, EINVAL);
  221.         ipc_answer_0(rid, EINVAL);
  222.         return;
  223.     }
  224.    
  225.     // TODO
  226.     ipc_answer_0(callid, ENOENT);
  227.     ipc_answer_2(rid, ENOENT, 0, 0);
  228. }
  229.  
  230. void devfs_truncate(ipc_callid_t rid, ipc_call_t *request)
  231. {
  232.     ipc_answer_0(rid, ENOTSUP);
  233. }
  234.  
  235. void devfs_destroy(ipc_callid_t rid, ipc_call_t *request)
  236. {
  237.     ipc_answer_0(rid, ENOTSUP);
  238. }
  239.  
  240. /**
  241.  * @}
  242.  */
  243.