Re: [XFS Tests Punch Hole 2/3 v3] XFS TESTS: Add Fallocate Punch Hole Test Routines

Joel Becker
2011-05-19T01:42:49Z

On Thu, May 19, 2011 at 11:31:44AM +1000, Dave Chinner wrote:
> > +#
> > +# This test is successful when the following conditions are met:
> > +# - ls shows that the number of blocks occupied by the file
> > +# has decreased by the number of blocks punched out.
>
> There's no guarantee that a filesystem will punch the number of
> blocks you expect.

Cluster allocated filesystems like ocfs2 are certainly going to
punch some multiple of clusters, not exact blocks. Eg if the hole is
punched in the middle of a cluster.

Joel

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