[Ocfs2-devel] [PATCH v5 7/7] add a flag for per-operation O_DSYNC semantics
Anton Altaparmakov
aia21 at cam.ac.uk
Thu Nov 6 20:22:48 PST 2014
Hi Jeff,
> On 7 Nov 2014, at 01:46, Jeff Moyer <jmoyer at redhat.com> wrote:
>
> Milosz Tanski <milosz at adfin.com> writes:
>
>> - if (type == READ && (flags & RWF_NONBLOCK))
>> - return -EAGAIN;
>> + if (type == READ) {
>> + if (flags & RWF_NONBLOCK)
>> + return -EAGAIN;
>> + } else {
>> + if (flags & RWF_DSYNC)
>> + return -EINVAL;
>> + }
>
> Minor nit, but I'd rather read something that looks like this:
>
> if (type == READ && (flags & RWF_NONBLOCK))
> return -EAGAIN;
> else if (type == WRITE && (flags & RWF_DSYNC))
> return -EINVAL;
But your version is less logically efficient for the case where "type == READ" is true and "flags & RWF_NONBLOCK" is false because your version then has to do the "if (type == WRITE" check before discovering it does not need to take that branch either, whilst the original version does not have to do such a test at all.
Best regards,
Anton
> I won't lose sleep over it, though.
>
> Reviewed-by: Jeff Moyer <jmoyer at redhat.com>
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
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