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Date: Mon, 1 Oct 2012 17:47:29 -0700 From: Kent Overstreet <koverstreet@...gle.com> To: Zach Brown <zab@...bo.net> Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, tytso@...gle.com, tj@...nel.org, Dave Kleikamp <dave.kleikamp@...cle.com>, Dmitry Monakhov <dmonakhov@...nvz.org>, "Maxim V. Patlasov" <mpatlasov@...allels.com>, michael.mesnier@...el.com, jeffrey.d.skirvin@...el.com, Martin Petersen <martin.petersen@...cle.com> Subject: Re: [RFC, PATCH] Extensible AIO interface On Mon, Oct 01, 2012 at 04:44:39PM -0700, Zach Brown wrote: > And what about duplicate instances of a given attribute id? Use the > first? The last? Error? Depends on the id? I thought of a better idea, instead of explicitly checking for disallowed dups: We want to return -ENOTHANDLED for not handled attributes anyways, so let's just do that for dups - that'll catch erronious usage just fine and a generic mechanism's better than a one off hack any day. This does mean we can't punt on return values, which isn't a bad thing. Also, if we've got duplicate attributes userspace needs to be able to figure out which return value was for which attribute. Two possibilities: one, return values come out in the same order attributes went in. That'd work, but I dislike the subtlety and I expect it'd be a pain for userspace. Instead, let's just stick a u64 cookie in the attribute and include that in the return, just like we do everywhere else. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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