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Date: Mon, 8 Jun 2020 00:35:24 -0700 From: Christoph Hellwig <hch@...radead.org> To: Harshad Shirwadkar <harshadshirwadkar@...il.com> Cc: linux-ext4@...r.kernel.org Subject: Re: [PATCH] ext4: issue aligned discards On Fri, Jun 05, 2020 at 03:28:19PM -0700, Harshad Shirwadkar wrote: > Ext4 before this patch can issue discards without respecting block > device's discard alignment. Such a discard results in EIO and > kernel logs. No, that is not how discard works. The granularity is a hint and blk_bio_discard_split already does all the work to align to it. If you have a make_request based driver that doesn't do that you need to fix that driver instead.
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