[illumos-Developer] NOW with zvol-only zfs diffs --> iSCSI UNMAP

[Joerg Schilling]

"Garrett D'Amore" <garrett at nexenta.com> wrote:

> I noticed the fcntl() usage myself, and thought it was a bit strange.
>
> I would like to make sure that if we choose an ioctl, it will work with
> ordinary SCSI unmap (initiated from ZFS for example) as well -- then it
> should be a fairly straight-forward matter to extend this in sd and
> SCSA.
>
> 	- Garrett
>
> On Sat, 2011-02-19 at 09:40 -0500, Eric Schrock wrote:
> > I looked into F_FREESP a little more, and unfortunately it's not as
> > universal as I had hoped.  This is really an argument to fcntl(),
> > which itself gets translated to VOP_SPACE() under the hood (after
> > checking that the file type is VREG).  So the idea of using the same
> > ioctl() for both regular files and devices is bogus.  Rather than
> > trying to shoehorn it in, I would create DKIOCFREE that has the
> > semantics we want (start and end of range, I would guess.

Is this a discussion related to the UNMAP/TRIM?

If yes, why do you talk about F_FREESP?

F_FREESP is to punch holes into files.

Jörg

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