Re: clearing 'flag unwritten extents'

[Steve Lord <lord@xxxxxxx>]

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