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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 <errno.h>
  42. #include <stdlib.h>
  43. #include <string.h>
  44. #include <sys/types.h>
  45. #include <as.h>
  46. #include <libblock.h>
  47. #include <byteorder.h>
  48.  
  49. #define TMPFS_BLOCK_SIZE    1024
  50.  
  51. struct rdentry {
  52.     uint8_t type;
  53.     uint32_t len;
  54. } __attribute__((packed));
  55.  
  56. static bool
  57. tmpfs_restore_recursion(int dev, off_t *bufpos, size_t *buflen, off_t *pos,
  58.     tmpfs_dentry_t *parent)
  59. {
  60.     struct rdentry entry;
  61.     libfs_ops_t *ops = &tmpfs_libfs_ops;
  62.     int rc;
  63.    
  64.     do {
  65.         char *fname;
  66.         tmpfs_dentry_t *node;
  67.         uint32_t size;
  68.        
  69.         if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
  70.             TMPFS_BLOCK_SIZE) != EOK)
  71.             return false;
  72.        
  73.         entry.len = uint32_t_le2host(entry.len);
  74.        
  75.         switch (entry.type) {
  76.         case TMPFS_NONE:
  77.             break;
  78.         case TMPFS_FILE:
  79.             fname = malloc(entry.len + 1);
  80.             if (fname == NULL)
  81.                 return false;
  82.            
  83.             node = (tmpfs_dentry_t *) ops->create(dev, L_FILE);
  84.             if (node == NULL) {
  85.                 free(fname);
  86.                 return false;
  87.             }
  88.            
  89.             if (block_read(dev, bufpos, buflen, pos, fname,
  90.                 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
  91.                 ops->destroy((void *) node);
  92.                 free(fname);
  93.                 return false;
  94.             }
  95.             fname[entry.len] = 0;
  96.            
  97.             rc = ops->link((void *) parent, (void *) node, fname);
  98.             if (rc != EOK) {
  99.                 ops->destroy((void *) node);
  100.                 free(fname);
  101.                 return false;
  102.             }
  103.             free(fname);
  104.            
  105.             if (block_read(dev, bufpos, buflen, pos, &size,
  106.                 sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
  107.                 return false;
  108.            
  109.             size = uint32_t_le2host(size);
  110.            
  111.             node->data = malloc(size);
  112.             if (node->data == NULL)
  113.                 return false;
  114.            
  115.             node->size = size;
  116.             if (block_read(dev, bufpos, buflen, pos, node->data,
  117.                 size, TMPFS_BLOCK_SIZE) != EOK)
  118.                 return false;
  119.            
  120.             break;
  121.         case TMPFS_DIRECTORY:
  122.             fname = malloc(entry.len + 1);
  123.             if (fname == NULL)
  124.                 return false;
  125.            
  126.             node = (tmpfs_dentry_t *) ops->create(dev, L_DIRECTORY);
  127.             if (node == NULL) {
  128.                 free(fname);
  129.                 return false;
  130.             }
  131.            
  132.             if (block_read(dev, bufpos, buflen, pos, fname,
  133.                 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
  134.                 ops->destroy((void *) node);
  135.                 free(fname);
  136.                 return false;
  137.             }
  138.             fname[entry.len] = 0;
  139.  
  140.             rc = ops->link((void *) parent, (void *) node, fname);
  141.             if (rc != EOK) {
  142.                 ops->destroy((void *) node);
  143.                 free(fname);
  144.                 return false;
  145.             }
  146.             free(fname);
  147.            
  148.             if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
  149.                 node))
  150.                 return false;
  151.            
  152.             break;
  153.         default:
  154.             return false;
  155.         }
  156.     } while (entry.type != TMPFS_NONE);
  157.    
  158.     return true;
  159. }
  160.  
  161. bool tmpfs_restore(dev_handle_t dev)
  162. {
  163.     libfs_ops_t *ops = &tmpfs_libfs_ops;
  164.     int rc;
  165.  
  166.     rc = block_init(dev, TMPFS_BLOCK_SIZE);
  167.     if (rc != EOK)
  168.         return false;
  169.    
  170.     off_t bufpos = 0;
  171.     size_t buflen = 0;
  172.     off_t pos = 0;
  173.    
  174.     char tag[6];
  175.     if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
  176.         TMPFS_BLOCK_SIZE) != EOK)
  177.         goto error;
  178.    
  179.     tag[5] = 0;
  180.     if (strcmp(tag, "TMPFS") != 0)
  181.         goto error;
  182.    
  183.     if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
  184.         ops->root_get(dev)))
  185.         goto error;
  186.        
  187.     block_fini(dev);
  188.     return true;
  189.    
  190. error:
  191.     block_fini(dev);
  192.     return false;
  193. }
  194.  
  195. /**
  196.  * @}
  197.  */
  198.