xref: /onnv-gate/usr/src/cmd/ntfsprogs/cluster.c (revision 10465:f9789e1a1626)
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