Re: BLKZEROOUT + pread should return zeroes, right?

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On Tue, Oct 14, 2014 at 02:21:28AM -0700, Christoph Hellwig wrote:
> On Tue, Oct 14, 2014 at 03:27:11PM +1100, Dave Chinner wrote:
> > Broken usage, IMO. If you are going to use the block layer ioctls to
> > manipulate data int eh block device, you should be using direct Io
> > for all your data IO to the block device. Otherwise, coherency
> > problems occur....
> 
> I'd say BLKZEROOUT semantics are broken.  Having an ioctl exposed
> that maniulates on-disk data without cache coherence is a nightmare
> that people trip over easily.  Even experienced people like Darrick.

I'm definitely with Christoph on this one.  Coherent writes should be
the norm.

- z
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