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Defined the last logfile block as preceding block 4 in ntfsrecover

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When block 2 or block 3 points backward to block 4, it is not clear
whether the log file only consists of block 2 or block 3 or the log
file has just wrapped around. The latter is now assumed.
This commit is contained in:
Jean-Pierre André 2015-11-12 15:31:24 +01:00
parent f7bc5249bc
commit 59c90f039d
1 changed files with 8 additions and 0 deletions
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8
ntfsprogs/ntfsrecover.c
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@ -1102,6 +1102,14 @@ static const struct BUFFER *findprevious(CONTEXT *ctx, const struct BUFFER *buf)
rph = &buf->block.record;
prevblk = (le32_to_cpu(rph->copy.file_offset)
>> blockbits) - 1;
/*
* If an initial block leads to block 4, it
* can mean the last block or no previous
* block at all. Using the last block is safer,
* its lsn will indicate whether it is stale.
*/
if (prevblk < BASEBLKS)
prevblk = (logfilesz >> blockbits) - 1;
}
/* No previous block if the log only consists of block 2 or 3 */
if (prevblk < BASEBLKS) {