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