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XFS information request

To: linux-xfs@xxxxxxxxxxx
Subject: XFS information request
From: Richard Downer <richard_downer@xxxxxxxxxxx>
Date: Fri, 14 Jul 2000 13:38:58 +0100
Organization: Agilent Technologies UK Ltd.
Sender: owner-linux-xfs@xxxxxxxxxxx

As this message is probably not-quite-on-topic for this list I will keep
this brief, and welcome any responses either to the list or through
private email.

We're interested in using XFS as the file system on an embedded device. 
This device performs data logging tasks.  Data integrity is important,
and the device could potentially be used in an environment where power
failures happen regularly.  After a power failure, the device must
recover very quickly -- this is why XFS looks like good solution to our

I'd like some information on how data is written to the disk -- what is
written to the disk and what is stored in the journal, at what stages
the structures on the disk are updated, how the filesystem recovers
after an unclean shutdown, and so on.  If a file is damaged by unclean
shutdown, then subsequently recovered, what state will the file be in? 
What kind of corruption, if any, could it suffer?

  Richard Downer * Telecom Network Test Division * Agilent Technologies
       Tel 0131-331-7436 * Fax 0131-331-7172 * Internal Tel 32436

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