ntfsprogs/cluster.c

   1 /**
   2  * cluster - Part of the Linux-NTFS project.
   3  *
   4  * Copyright (c) 2002-2003 Richard Russon
   5  * Copyright (c) 2014      Jean-Pierre Andre
   6  *
   7  * This function will locate the owner of any given sector or cluster range.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program (in the main directory of the Linux-NTFS
  21  * distribution in the file COPYING); if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26
  27 #ifdef HAVE_STDIO_H
  28 #include <stdio.h>
  29 #endif
  30 #ifdef HAVE_STDLIB_H
  31 #include <stdlib.h>
  32 #endif
  33 #ifdef HAVE_STRING_H
  34 #include <string.h>
  35 #endif
  36
  37 #include "cluster.h"
  38 #include "utils.h"
  39 #include "logging.h"
  40
  41 /**
  42  * cluster_find
  43  */
  44 int cluster_find(ntfs_volume *vol, LCN c_begin, LCN c_end, cluster_cb *cb, void *data)
  45 {
  46         int j;
  47         int result = -1;
  48         struct mft_search_ctx *m_ctx = NULL;
  49         ntfs_attr_search_ctx  *a_ctx = NULL;
  50         s64 count;
  51         BOOL found;
  52         ATTR_RECORD *rec;
  53         runlist *runs;
  54
  55         if (!vol || !cb)
  56                 return -1;
  57
  58         m_ctx = mft_get_search_ctx(vol);
  59         m_ctx->flags_search = FEMR_IN_USE | FEMR_BASE_RECORD;
  60         count = 0;
  61
  62         while (mft_next_record(m_ctx) == 0) {
  63
  64                 if (!(m_ctx->flags_match & FEMR_BASE_RECORD))
  65                         continue;
  66
  67                 ntfs_log_verbose("Inode: %llu\n", (unsigned long long)
  68                                 m_ctx->inode->mft_no);
  69
  70                 a_ctx = ntfs_attr_get_search_ctx(m_ctx->inode, NULL);
  71
  72                 found = FALSE;
  73                 while ((rec = find_attribute(AT_UNUSED, a_ctx))) {
  74
  75                         if (!rec->non_resident) {
  76                                 ntfs_log_verbose("0x%02x skipped - attr is resident\n",
  77                                         (int)le32_to_cpu(a_ctx->attr->type));
  78                                 continue;
  79                         }
  80
  81                         runs = ntfs_mapping_pairs_decompress(vol, a_ctx->attr, NULL);
  82                         if (!runs) {
  83                                 ntfs_log_error("Couldn't read the data runs.\n");
  84                                 goto done;
  85                         }
  86
  87                         ntfs_log_verbose("\t[0x%02X]\n",
  88                                         (int)le32_to_cpu(a_ctx->attr->type));
  89
  90                         ntfs_log_verbose("\t\tVCN\tLCN\tLength\n");
  91                         for (j = 0; runs[j].length > 0; j++) {
  92                                 LCN a_begin = runs[j].lcn;
  93                                 LCN a_end   = a_begin + runs[j].length - 1;
  94
  95                                 if (a_begin < 0)
  96                                         continue;       // sparse, discontiguous, etc
  97
  98                                 ntfs_log_verbose("\t\t%lld\t%lld-%lld (%lld)\n",
  99                                                 (long long)runs[j].vcn,
 100                                                 (long long)runs[j].lcn,
 101                                                 (long long)(runs[j].lcn +
 102                                                 runs[j].length - 1),
 103                                                 (long long)runs[j].length);
 104                                 //dprint list
 105
 106                                 if ((a_begin > c_end) || (a_end < c_begin))
 107                                         continue;       // before or after search range
 108
 109                                 if ((*cb) (m_ctx->inode, a_ctx->attr, runs+j, data))
 110                                         return 1;
 111                                 found = TRUE;
 112                         }
 113                 }
 114
 115                 ntfs_attr_put_search_ctx(a_ctx);
 116                 a_ctx = NULL;
 117                 if (found)
 118                         count++;
 119         }
 120
 121         if (count > 1)
 122                 ntfs_log_info("* %lld inodes found\n",(long long)count);
 123         else
 124                 ntfs_log_info("* %s inode found\n", (count ? "one" : "no"));
 125         result = 0;
 126 done:
 127         ntfs_attr_put_search_ctx(a_ctx);
 128         mft_put_search_ctx(m_ctx);
 129
 130         return result;
 131 }
 132