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SubjectRe: Dump corrupts ext2?


On Thursday, October 11, 2001 12:29:03 AM -0400 Alexander Viro <viro@math.psu.edu> wrote:
> On Thu, 11 Oct 2001, Benjamin LaHaise wrote:
>
>> On Wed, Oct 10, 2001 at 09:48:41PM -0400, Chris Mason wrote:
>> > The bug where dump could corrupt things was when getblk and the
>> > block device both used the buffer cache. That issue hasn't changed.
>>
>> Let me emphasize this: 2.4.11+ will still exhibit filesystem corruption if
>> the block device is accessed. The only way to avoid this is to use raw io,
>
> What? Details, please. If you are talking about read access I would
> really like to know which filesystem it is. ext2 used to have a bug
> in that area, but it had been fixed months ago.

Sorry, I wasn't very clear. As far as I know, the specific ext2 bug
(race on up to date flag of newly allocated metadata) was found/fixed
by Al.

The issues left are just dump getting inconsistent backups from
a rw mounted disk. We'll have this bug regardless of page cache vs buffer
cache vs raw io in dump.

Now, what's interesting is the raw io dump + ext3 case.

-chris

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