[Bugs] [Bug 1737141] read() returns more than file size when using direct I/O

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1737141

Kevin Wolf <kwolf at redhat.com> changed:

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--- Comment #4 from Kevin Wolf <kwolf at redhat.com> ---
(In reply to Nir Soffer from comment #2)
> Kevin, do you think this can affect qemu/qemu-img?

This is not a problem for QEMU as long as the file size is correct. If gluster
didn't do the zero padding, QEMU would do it internally.

In fact, fixing this in gluster may break the case of unaligned image sizes
with QEMU because the image size is rounded up to sector (512 byte) granularity
and the gluster driver turns short reads into errors. This would actually
affect non-O_DIRECT, too, which already seems to behave this way, so can you
just give this a quick test?

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