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Used a default usn when the former one cannot be retrieved 

When creating a new MFT record, the former seq_no and usn are retrieved
to avoid the new one to be mistaken for the former one.
This may not be possible when the record is used for the first time
or after some bad error. In such situation use default values.
pull/40/head
Jean-Pierre André 2021-09-21 10:53:16 +02:00
parent 92b9fbc6fe
commit a8818cf779
1 changed files with 11 additions and 2 deletions
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13
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) 2014-2018 Jean-Pierre Andre
* Copyright (c) 2014-2021 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
@ -1529,8 +1529,17 @@ found_free_rec:
goto undo_mftbmp_alloc;
}
/*
* Retrieve the former seq_no and usn so that the new record
* cannot be mistaken for the former one.
* However the original record may just be garbage, so
* use some sensible value when they cannot be retrieved.
*/
seq_no = m->sequence_number;
usn = *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs));
if (le16_to_cpu(m->usa_ofs) <= (NTFS_BLOCK_SIZE - 2))
usn = *(le16*)((u8*)m + le16_to_cpu(m->usa_ofs & -2));
else
usn = const_cpu_to_le16(1);
if (ntfs_mft_record_layout(vol, bit, m)) {
ntfs_log_error("Failed to re-format mft record.\n");
free(m);