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https://git.code.sf.net/p/ntfs-3g/ntfs-3g.git
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139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/**
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* cluster - Part of the Linux-NTFS project.
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*
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* Copyright (c) 2002-2003 Richard Russon
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*
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* This function will locate the owner of any given sector or cluster range.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "cluster.h"
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#include "utils.h"
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#include "logging.h"
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/**
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* cluster_find
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*/
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int cluster_find(ntfs_volume *vol, LCN c_begin, LCN c_end, cluster_cb *cb, void *data)
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{
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u64 i;
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int j;
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int in_use = 0;
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int result = -1;
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struct mft_search_ctx *m_ctx = NULL;
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ntfs_attr_search_ctx *a_ctx = NULL;
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ATTR_RECORD *rec;
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runlist *runs;
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if (!vol || !cb)
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return -1;
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// Quick check that at least one cluster is in use
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for (i = c_begin; (LCN)i < c_end; i++) {
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if (utils_cluster_in_use(vol, i) == 1) {
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in_use = 1;
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break;
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}
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}
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if (!in_use) {
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if (c_begin == c_end)
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ntfs_log_verbose("cluster isn't in use\n");
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else
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ntfs_log_verbose("clusters aren't in use\n");
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return 0;
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}
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m_ctx = mft_get_search_ctx(vol);
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m_ctx->flags_search = FEMR_IN_USE | FEMR_BASE_RECORD;
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while (mft_next_record(m_ctx) == 0) {
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ntfs_log_quiet("Inode: %llu\n", (unsigned long long)
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m_ctx->inode->mft_no);
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if (!(m_ctx->flags_match & FEMR_BASE_RECORD))
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continue;
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ntfs_log_verbose("Inode: %llu\n", (unsigned long long)
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m_ctx->inode->mft_no);
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a_ctx = ntfs_attr_get_search_ctx(m_ctx->inode, NULL);
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while ((rec = find_attribute(AT_UNUSED, a_ctx))) {
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if (!rec->non_resident) {
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ntfs_log_verbose("0x%02x skipped - attr is resident\n", a_ctx->attr->type);
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continue;
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}
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runs = ntfs_mapping_pairs_decompress(vol, a_ctx->attr, NULL);
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if (!runs) {
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ntfs_log_error("Couldn't read the data runs.\n");
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goto done;
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}
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ntfs_log_verbose("\t[0x%02X]\n", a_ctx->attr->type);
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ntfs_log_verbose("\t\tVCN\tLCN\tLength\n");
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for (j = 0; runs[j].length > 0; j++) {
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LCN a_begin = runs[j].lcn;
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LCN a_end = a_begin + runs[j].length - 1;
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if (a_begin < 0)
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continue; // sparse, discontiguous, etc
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ntfs_log_verbose("\t\t%lld\t%lld-%lld (%lld)\n",
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(long long)runs[j].vcn,
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(long long)runs[j].lcn,
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(long long)(runs[j].lcn +
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runs[j].length - 1),
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(long long)runs[j].length);
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//dprint list
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if ((a_begin > c_end) || (a_end < c_begin))
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continue; // before or after search range
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if ((*cb) (m_ctx->inode, a_ctx->attr, runs+j, data))
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return 1;
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}
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}
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ntfs_attr_put_search_ctx(a_ctx);
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a_ctx = NULL;
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}
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result = 0;
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done:
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ntfs_attr_put_search_ctx(a_ctx);
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mft_put_search_ctx(m_ctx);
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return result;
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}
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