linux-kernel - Re: next bio iters break discard?

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Message-ID: <yq1ob3el3mr.fsf@sermon.lab.mkp.net>
Date:	Tue, 14 Jan 2014 15:17:32 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Hugh Dickins <hughd@...gle.com>, Jens Axboe <axboe@...nel.dk>,
	Shaohua Li <shli@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: next bio iters break discard?

>>>>> "Kent" == Kent Overstreet <kmo@...erainc.com> writes:

>> IOW, DISCARD, WRITE SAME and the impending COPY requests do not have
>> a 1:1 mapping between the block range worked on and the size of any
>> bvecs attached. Your recent changes must have changed the way we
>> handled that in the past.

Kent> Yeah - but with WRITE_SAME bios, wouldn't we at least have to
Kent> check that they're writing the same data to merge them?

We do. Check blk_write_same_mergeable().

-- 
Martin K. Petersen	Oracle Linux Engineering
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