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  1. /*
  2.  * Copyright (c) 2008 Jakub Jermar
  3.  * Copyright (c) 2008 Martin Decky
  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    tmpfs_dump.c
  36.  * @brief   Support for loading TMPFS file system dump.
  37.  */
  38.  
  39. #include "tmpfs.h"
  40. #include "../../vfs/vfs.h"
  41. #include <ipc/ipc.h>
  42. #include <async.h>
  43. #include <errno.h>
  44. #include <stdlib.h>
  45. #include <string.h>
  46. #include <sys/types.h>
  47. #include <as.h>
  48. #include <libfs.h>
  49. #include <ipc/services.h>
  50. #include <ipc/devmap.h>
  51. #include <sys/mman.h>
  52. #include <byteorder.h>
  53.  
  54. #define TMPFS_BLOCK_SIZE    1024
  55.  
  56. struct rdentry {
  57.     uint8_t type;
  58.     uint32_t len;
  59. } __attribute__((packed));
  60.  
  61. static bool
  62. tmpfs_restore_recursion(int phone, void *block, off_t *bufpos, size_t *buflen,
  63.     off_t *pos, tmpfs_dentry_t *parent)
  64. {
  65.     struct rdentry entry;
  66.     libfs_ops_t *ops = &tmpfs_libfs_ops;
  67.    
  68.     do {
  69.         char *fname;
  70.         tmpfs_dentry_t *node;
  71.         uint32_t size;
  72.        
  73.         if (!libfs_blockread(phone, block, bufpos, buflen, pos, &entry,
  74.             sizeof(entry), TMPFS_BLOCK_SIZE))
  75.             return false;
  76.        
  77.         entry.len = uint32_t_le2host(entry.len);
  78.        
  79.         switch (entry.type) {
  80.         case TMPFS_NONE:
  81.             break;
  82.         case TMPFS_FILE:
  83.             fname = malloc(entry.len + 1);
  84.             if (fname == NULL)
  85.                 return false;
  86.            
  87.             node = (tmpfs_dentry_t *) ops->create(L_FILE);
  88.             if (node == NULL) {
  89.                 free(fname);
  90.                 return false;
  91.             }
  92.            
  93.             if (!libfs_blockread(phone, block, bufpos, buflen, pos,
  94.                 fname, entry.len, TMPFS_BLOCK_SIZE)) {
  95.                 ops->destroy((void *) node);
  96.                 free(fname);
  97.                 return false;
  98.             }
  99.             fname[entry.len] = 0;
  100.            
  101.             if (!ops->link((void *) parent, (void *) node, fname)) {
  102.                 ops->destroy((void *) node);
  103.                 free(fname);
  104.                 return false;
  105.             }
  106.             free(fname);
  107.            
  108.             if (!libfs_blockread(phone, block, bufpos, buflen, pos,
  109.                 &size, sizeof(size), TMPFS_BLOCK_SIZE))
  110.                 return false;
  111.            
  112.             size = uint32_t_le2host(size);
  113.            
  114.             node->data = malloc(size);
  115.             if (node->data == NULL)
  116.                 return false;
  117.            
  118.             node->size = size;
  119.             if (!libfs_blockread(phone, block, bufpos, buflen, pos,
  120.                 node->data, size, TMPFS_BLOCK_SIZE))
  121.                 return false;
  122.            
  123.             break;
  124.         case TMPFS_DIRECTORY:
  125.             fname = malloc(entry.len + 1);
  126.             if (fname == NULL)
  127.                 return false;
  128.            
  129.             node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
  130.             if (node == NULL) {
  131.                 free(fname);
  132.                 return false;
  133.             }
  134.            
  135.             if (!libfs_blockread(phone, block, bufpos, buflen, pos,
  136.                 fname, entry.len, TMPFS_BLOCK_SIZE)) {
  137.                 ops->destroy((void *) node);
  138.                 free(fname);
  139.                 return false;
  140.             }
  141.             fname[entry.len] = 0;
  142.            
  143.             if (!ops->link((void *) parent, (void *) node, fname)) {
  144.                 ops->destroy((void *) node);
  145.                 free(fname);
  146.                 return false;
  147.             }
  148.             free(fname);
  149.            
  150.             if (!tmpfs_restore_recursion(phone, block, bufpos,
  151.                 buflen, pos, node))
  152.                 return false;
  153.            
  154.             break;
  155.         default:
  156.             return false;
  157.         }
  158.     } while (entry.type != TMPFS_NONE);
  159.    
  160.     return true;
  161. }
  162.  
  163. bool tmpfs_restore(dev_handle_t dev)
  164. {
  165.     libfs_ops_t *ops = &tmpfs_libfs_ops;
  166.  
  167.     void *block = mmap(NULL, TMPFS_BLOCK_SIZE,
  168.         PROTO_READ | PROTO_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
  169.    
  170.     if (block == NULL)
  171.         return false;
  172.    
  173.     int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
  174.         DEVMAP_CONNECT_TO_DEVICE, dev);
  175.  
  176.     if (phone < 0) {
  177.         munmap(block, TMPFS_BLOCK_SIZE);
  178.         return false;
  179.     }
  180.    
  181.     if (ipc_share_out_start(phone, block, AS_AREA_READ | AS_AREA_WRITE) !=
  182.         EOK)
  183.         goto error;
  184.    
  185.     off_t bufpos = 0;
  186.     size_t buflen = 0;
  187.     off_t pos = 0;
  188.    
  189.     char tag[6];
  190.     if (!libfs_blockread(phone, block, &bufpos, &buflen, &pos, tag, 5,
  191.         TMPFS_BLOCK_SIZE))
  192.         goto error;
  193.    
  194.     tag[5] = 0;
  195.     if (strcmp(tag, "TMPFS") != 0)
  196.         goto error;
  197.    
  198.     if (!tmpfs_restore_recursion(phone, block, &bufpos, &buflen, &pos,
  199.         ops->root_get(dev)))
  200.         goto error;
  201.        
  202.     ipc_hangup(phone);
  203.     munmap(block, TMPFS_BLOCK_SIZE);
  204.     return true;
  205.    
  206. error:
  207.     ipc_hangup(phone);
  208.     munmap(block, TMPFS_BLOCK_SIZE);
  209.     return false;
  210. }
  211.  
  212. /**
  213.  * @}
  214.  */
  215.