1 /**
2 * cluster - Part of the Linux-NTFS project.
3 *
4 * Copyright (c) 2002-2003 Richard Russon
5 *
6 * This function will locate the owner of any given sector or cluster range.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include "config.h"
25
26 #ifdef HAVE_STDIO_H
27 #include <stdio.h>
28 #endif
29 #ifdef HAVE_STDLIB_H
30 #include <stdlib.h>
31 #endif
32 #ifdef HAVE_STRING_H
33 #include <string.h>
34 #endif
35
36 #include "compat.h"
37 #include "cluster.h"
38 #include "utils.h"
39 #include "logging.h"
40
41 /**
42 * cluster_find
43 */
cluster_find(ntfs_volume * vol,LCN c_begin,LCN c_end,cluster_cb * cb,void * data)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 ATTR_RECORD *rec;
51 runlist *runs;
52
53 if (!vol || !cb)
54 return -1;
55
56 m_ctx = mft_get_search_ctx(vol);
57 m_ctx->flags_search = FEMR_IN_USE | FEMR_BASE_RECORD;
58
59 while (mft_next_record(m_ctx) == 0) {
60
61 if (!(m_ctx->flags_match & FEMR_BASE_RECORD))
62 continue;
63
64 ntfs_log_verbose("Inode: %llu\n", (unsigned long long)
65 m_ctx->inode->mft_no);
66
67 a_ctx = ntfs_attr_get_search_ctx(m_ctx->inode, NULL);
68
69 while ((rec = find_attribute(AT_UNUSED, a_ctx))) {
70
71 if (!rec->non_resident) {
72 ntfs_log_verbose("0x%02x skipped - attr is resident\n", a_ctx->attr->type);
73 continue;
74 }
75
76 runs = ntfs_mapping_pairs_decompress(vol, a_ctx->attr, NULL);
77 if (!runs) {
78 ntfs_log_error("Couldn't read the data runs.\n");
79 goto done;
80 }
81
82 ntfs_log_verbose("\t[0x%02X]\n", a_ctx->attr->type);
83
84 ntfs_log_verbose("\t\tVCN\tLCN\tLength\n");
85 for (j = 0; runs[j].length > 0; j++) {
86 LCN a_begin = runs[j].lcn;
87 LCN a_end = a_begin + runs[j].length - 1;
88
89 if (a_begin < 0)
90 continue; // sparse, discontiguous, etc
91
92 ntfs_log_verbose("\t\t%lld\t%lld-%lld (%lld)\n",
93 (long long)runs[j].vcn,
94 (long long)runs[j].lcn,
95 (long long)(runs[j].lcn +
96 runs[j].length - 1),
97 (long long)runs[j].length);
98 //dprint list
99
100 if ((a_begin > c_end) || (a_end < c_begin))
101 continue; // before or after search range
102
103 if ((*cb) (m_ctx->inode, a_ctx->attr, runs+j, data))
104 return 1;
105 }
106 }
107
108 ntfs_attr_put_search_ctx(a_ctx);
109 a_ctx = NULL;
110 }
111
112 result = 0;
113 done:
114 ntfs_attr_put_search_ctx(a_ctx);
115 mft_put_search_ctx(m_ctx);
116
117 return result;
118 }
119
120