From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Andreas Dilger <adilger@clusterfs.com>
Cc: tytso@mit.edu, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 2/4] e2fsprogs: Add undoe2fs
Date: Wed, 01 Aug 2007 11:46:25 +0530 [thread overview]
Message-ID: <46B02539.5020505@linux.vnet.ibm.com> (raw)
In-Reply-To: <20070801060211.GO5469@schatzie.adilger.int>
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
next prev parent reply other threads:[~2007-08-01 6:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bee58d48110eee4d5cd133167245b99644148d96.1185933778.git.aneesh.kumar@linux.vnet.ibm.com>
2007-08-01 2:04 ` [PATCH 1/4] e2fsprogs: Add undo I/O manager Aneesh Kumar K.V
[not found] ` <70b3f394cda275d59094d52f60d1ee76492033fc.1185933778.git.aneesh.kumar@linux.vnet.ibm.com>
2007-08-01 2:04 ` [PATCH 3/4] e2fsprogs: Make mke2fs use " Aneesh Kumar K.V
2007-08-01 6:04 ` Andreas Dilger
2007-08-01 6:14 ` Aneesh Kumar K.V
2007-08-01 7:14 ` Andreas Dilger
[not found] ` <83d2fbbea6a099e38b1358e6cbc0f59c4883ddef.1185933778.git.aneesh.kumar@linux.vnet.ibm.com>
2007-08-01 2:04 ` [PATCH 4/4] e2fsprogs: Support for large inode migration Aneesh Kumar K.V
[not found] ` <47f96570519d76b8d59f92b729a0a48c4a1b68d8.1185933778.git.aneesh.kumar@linux.vnet.ibm.com>
2007-08-01 2:04 ` [PATCH 2/4] e2fsprogs: Add undoe2fs Aneesh Kumar K.V
2007-08-01 6:02 ` Andreas Dilger
2007-08-01 6:16 ` Aneesh Kumar K.V [this message]
2007-08-01 6:33 ` Kalpak Shah
2007-08-01 7:10 ` Andreas Dilger
2007-08-01 7:52 ` Aneesh Kumar K.V
2007-08-01 8:27 ` Andreas Dilger
2007-08-01 15:34 e2fsprogs patches Aneesh Kumar K.V
2007-08-01 15:34 ` [PATCH 1/4] e2fsprogs: Add undo I/O manager Aneesh Kumar K.V
[not found] ` <f2c3823cb66c7a30436b1f2163cbe3bba791a115.1185981319.git.aneesh.kumar@linux.vnet.ibm.com>
[not found] ` <53bd7d38bb3251e93fb35f56e38d2d1904951ed0.1185981319.git.aneesh.kumar@linux.vnet.ibm.com>
2007-08-01 15:34 ` [PATCH 2/4] e2fsprogs: Add undoe2fs Aneesh Kumar K.V
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