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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.     fs_node_t *pfn)
  59. {
  60.     struct rdentry entry;
  61.     libfs_ops_t *ops = &tmpfs_libfs_ops;
  62.     int rc;
  63.    
  64.     do {
  65.         char *fname;
  66.         fs_node_t *fn;
  67.         tmpfs_dentry_t *nodep;
  68.         uint32_t size;
  69.        
  70.         if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
  71.             TMPFS_BLOCK_SIZE) != EOK)
  72.             return false;
  73.        
  74.         entry.len = uint32_t_le2host(entry.len);
  75.        
  76.         switch (entry.type) {
  77.         case TMPFS_NONE:
  78.             break;
  79.         case TMPFS_FILE:
  80.             fname = malloc(entry.len + 1);
  81.             if (fname == NULL)
  82.                 return false;
  83.            
  84.             fn = ops->create(dev, L_FILE);
  85.             if (fn == NULL) {
  86.                 free(fname);
  87.                 return false;
  88.             }
  89.            
  90.             if (block_read(dev, bufpos, buflen, pos, fname,
  91.                 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
  92.                 ops->destroy(fn);
  93.                 free(fname);
  94.                 return false;
  95.             }
  96.             fname[entry.len] = 0;
  97.            
  98.             rc = ops->link(pfn, fn, fname);
  99.             if (rc != EOK) {
  100.                 ops->destroy(fn);
  101.                 free(fname);
  102.                 return false;
  103.             }
  104.             free(fname);
  105.            
  106.             if (block_read(dev, bufpos, buflen, pos, &size,
  107.                 sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
  108.                 return false;
  109.            
  110.             size = uint32_t_le2host(size);
  111.            
  112.             nodep = TMPFS_NODE(fn);
  113.             nodep->data = malloc(size);
  114.             if (nodep->data == NULL)
  115.                 return false;
  116.            
  117.             nodep->size = size;
  118.             if (block_read(dev, bufpos, buflen, pos, nodep->data,
  119.                 size, TMPFS_BLOCK_SIZE) != EOK)
  120.                 return false;
  121.            
  122.             break;
  123.         case TMPFS_DIRECTORY:
  124.             fname = malloc(entry.len + 1);
  125.             if (fname == NULL)
  126.                 return false;
  127.            
  128.             fn = ops->create(dev, L_DIRECTORY);
  129.             if (fn == NULL) {
  130.                 free(fname);
  131.                 return false;
  132.             }
  133.            
  134.             if (block_read(dev, bufpos, buflen, pos, fname,
  135.                 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
  136.                 ops->destroy(fn);
  137.                 free(fname);
  138.                 return false;
  139.             }
  140.             fname[entry.len] = 0;
  141.  
  142.             rc = ops->link(pfn, fn, fname);
  143.             if (rc != EOK) {
  144.                 ops->destroy(fn);
  145.                 free(fname);
  146.                 return false;
  147.             }
  148.             free(fname);
  149.            
  150.             if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
  151.                 fn))
  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.     int rc;
  167.  
  168.     rc = block_init(dev, TMPFS_BLOCK_SIZE);
  169.     if (rc != EOK)
  170.         return false;
  171.    
  172.     off_t bufpos = 0;
  173.     size_t buflen = 0;
  174.     off_t pos = 0;
  175.    
  176.     char tag[6];
  177.     if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
  178.         TMPFS_BLOCK_SIZE) != EOK)
  179.         goto error;
  180.    
  181.     tag[5] = 0;
  182.     if (str_cmp(tag, "TMPFS") != 0)
  183.         goto error;
  184.    
  185.     if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
  186.         ops->root_get(dev)))
  187.         goto error;
  188.        
  189.     block_fini(dev);
  190.     return true;
  191.    
  192. error:
  193.     block_fini(dev);
  194.     return false;
  195. }
  196.  
  197. /**
  198.  * @}
  199.  */
  200.