Christoph Hellwig, on 08/05/2010 09:09 PM wrote:
On Thu, Aug 05, 2010 at 05:11:56PM +0400, Vladislav Bolkhovitin wrote:
Chris Mason, on 08/02/2010 09:39 PM wrote:
I regret putting the ordering into the original barrier code...it
definitely did help reiserfs back in the day but it stinks of magic and
voodoo.
But if the ordering isn't in the common (block) code, how to implement
the "hardware offload" for ordering, i.e. ORDERED commands, in an
acceptable way?
Right now we have no working implementation of actually using ordered
tags for a storage device in Linux. There's very little need for common
code in that implementation - basically we just need flag in the bio /
request to make this one an ordered tag in addition to the existing
reordering preventing in the block queue.
New flag.. Easy to add, hard to live with. Aren't you already tied of
the existing flags hell?
Vlad
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