linux-ext4 - Re: [PATCH 2/4] e2fsprogs: Add undoe2fs

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Message-ID: <46B02539.5020505@linux.vnet.ibm.com>
Date:	Wed, 01 Aug 2007 11:46:25 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andreas Dilger <adilger@...sterfs.com>
CC:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/4] e2fsprogs: Add undoe2fs

Andreas Dilger wrote:
> On Aug 01, 2007  07:34 +0530, Aneesh Kumar K.V wrote:
>> undoe2fs can be used to replay the transaction saved
>> in the transaction file using undo I/O Manager
> 
> This should save the mtime of the superblock, and only do the undo
> step if the filesystem hasn't changed.  Otherwise it could seriously
> corrupt the filesystem.

I am not sure i understand this. The Undo I/O manager tracks all the write
happening to the file system and copy the original content of the blocks to
the tdb file. Undoe2fs simply copies these blocks back to the file system. So
That way if you look at undoe2fs it doesn't have any knowledge of the file
system at all.

Can you let me know a use case where this will fail.

-aneesh 
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