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Double-checked whether record 15 is an extent of MFT

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When extents are needed to store the runlist of the MFT, the first one
must be located in record 15 so that its location can be determined from
the part in the base extent. As this record is always marked in use,
determining whether it is not really in use requires a specific logic.
This commit is contained in:
Jean-Pierre André 2018-02-13 09:06:49 +01:00
parent f334c1fdc3
commit 1f8b751341
1 changed files with 18 additions and 7 deletions
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25
libntfs-3g/mft.c
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@ -5,7 +5,7 @@
* Copyright (c) 2004-2005 Richard Russon
* Copyright (c) 2004-2008 Szabolcs Szakacsits
* Copyright (c) 2005 Yura Pakhuchiy
* Copyright (c) 2014-2015 Jean-Pierre Andre
* Copyright (c) 2014-2018 Jean-Pierre Andre
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
@ -1389,16 +1389,27 @@ ntfs_inode *ntfs_mft_rec_alloc(ntfs_volume *vol, BOOL mft_data)
*/
if (ext_ni) {
/*
* Make sure record 15 is a base extent and has
* no extents.
* Also make sure it has no name : a base inode with
* no extents and no name cannot be in use.
* Otherwise apply standard procedure.
* Make sure record 15 is a base extent and it has
* no name. A base inode with no name cannot be in use.
* The test based on base_mft_record fails for
* extents of MFT, so we need a special check.
* If already used, apply standard procedure.
*/
if (!ext_ni->mrec->base_mft_record
&& !ext_ni->nr_extents)
&& !ext_ni->mrec->link_count)
forced_mft_data = TRUE;
ntfs_inode_close(ext_ni);
/* Double-check, in case it is used for MFT */
if (forced_mft_data && base_ni->nr_extents) {
int i;
for (i=0; i<base_ni->nr_extents; i++) {
if (base_ni->extent_nis[i]
&& (base_ni->extent_nis[i]->mft_no
== FILE_mft_data))
forced_mft_data = FALSE;
}
}
}
}
if (forced_mft_data)