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Re: clearing 'flag unwritten extents'

from [Steve Lord] [Permanent Link][Original]
To: Roger Willcocks <willcor@xxxxxxxxx>
Subject: Re: clearing 'flag unwritten extents'
From: Steve Lord <lord@xxxxxxx>
Date: Tue, 15 Nov 2005 09:25:18 -0600
Cc: Nathan Scott <nathans@xxxxxxx>, linux-xfs@xxxxxxxxxxx
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Roger Willcocks wrote:
On 11/13/05, Nathan Scott <nathans@xxxxxxx> wrote:
On Fri, Nov 11, 2005 at 12:48:48PM +0000, Roger Willcocks wrote: 
AIUI, the 'flag unwritten extents' option allows non-root users to
preallocate unwritten extents (root can always create them). Clearing
the option would just prevent the creation of new unwritten extents.

It does more than just that - in xfs_bmapi it changes the way
extents are handled - look for XFS_SB_VERSION_HASEXTFLGBIT in
xfs_bmap.c in particular.


But only for realtime extents - and I don't have any of those...

--
Roger


Nope, unwritten extents exist in the main part of the filesystem too.
They are not always used, but they are not just for realtime files.

Steve


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