From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E87F9C433EF for ; Sat, 23 Jul 2022 05:03:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yPkHEoIQjPt6lQAAcJNkqCIFlq/qJSZHwhawG3t8F1U=; b=0uw2bDYXmYtD+7TXfEe2dS6bME 7W9ZhqU845Y5z83Oge9dB69OJCo+Rra2dRrhwfrXm7C758inCLenosLCWvOU2dlGoWay7fr1gSflf YzoYz6rtczj3OrEI+UFJu1FLZ4YIKq3CBL8pRdi5whbRx2PSDhsUhlF8eTiwVWn2uuoi4I2N3UJTh fpTOsyxEC+7arP2Q0N/FWmuIHYhBz/D6aefIclUulKY1xpodJUSETO35zJJoKZ9Q1Ily8Nh/INh6S iXZBd3Ug42+q68eIy1osdddkIggahR+kmDHMS7AIBP00bRYAl8LrD/NOVaPjHI5hazeyLrZYQcTIH +BcNtURw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oF7IR-00FrnV-2R; Sat, 23 Jul 2022 05:03:23 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oF7IO-00FrlL-00 for linux-nvme@lists.infradead.org; Sat, 23 Jul 2022 05:03:21 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 78724B82BDE; Sat, 23 Jul 2022 05:03:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A452C341C0; Sat, 23 Jul 2022 05:03:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658552596; bh=AaXFZrwKTUU6UrRXrK94Z+zja72i1JjD3maZa+2WSDY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NiPTZKSntRLpsWC2wnEE/9s5Ls/ZV/qrKlqVIc1zO4K13INz/0pAB23jjh+OIe7Tb aVLUcjYx/E1f93YFKBHh6aF95V6SekpqSSQIbeSA/e+2vU4E6KJs/geUKC57+cZBXQ Xp0Aim38hl+Kp2FRQpOR+J/blPWy9OQ6nTQM+X0KCptWqjbOA8fba8Qmo+qSyHIcCB WkqPesCM9h8o31anSVs3tyFkotxcc5XlUjsHc23KYfW73nxG8qicIVJsNUGp+yChFd As/bA1MVnE3ZuwU4WizlJnw19tLqcMIZTcW6iJ1zOTW3+sWC/V3DbMrhHxjq6rTm5t C0YYwut8nyrIw== Date: Fri, 22 Jul 2022 22:03:15 -0700 From: "Darrick J. Wong" To: Eric Biggers Cc: Keith Busch , Jaegeuk Kim , Chao Yu , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, axboe@kernel.dk, Kernel Team , hch@lst.de, bvanassche@acm.org, damien.lemoal@opensource.wdc.com, pankydev8@gmail.com, Keith Busch , linux-f2fs-devel@lists.sourceforge.net Subject: Re: [PATCHv6 11/11] iomap: add support for dma aligned direct-io Message-ID: References: <20220610195830.3574005-1-kbusch@fb.com> <20220610195830.3574005-12-kbusch@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220722_220320_355639_5EA77654 X-CRM114-Status: GOOD ( 31.21 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Fri, Jul 22, 2022 at 06:12:40PM +0000, Eric Biggers wrote: > On Fri, Jul 22, 2022 at 10:53:42AM -0700, Darrick J. Wong wrote: > > On Fri, Jul 22, 2022 at 12:36:01AM -0700, Eric Biggers wrote: > > > [+f2fs list and maintainers] > > > > > > On Fri, Jun 10, 2022 at 12:58:30PM -0700, Keith Busch wrote: > > > > From: Keith Busch > > > > > > > > Use the address alignment requirements from the block_device for direct > > > > io instead of requiring addresses be aligned to the block size. > > > > > > > > Signed-off-by: Keith Busch > > > > Reviewed-by: Christoph Hellwig > > > > --- > > > > fs/iomap/direct-io.c | 4 ++-- > > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c > > > > index 370c3241618a..5d098adba443 100644 > > > > --- a/fs/iomap/direct-io.c > > > > +++ b/fs/iomap/direct-io.c > > > > @@ -242,7 +242,6 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, > > > > struct inode *inode = iter->inode; > > > > unsigned int blkbits = blksize_bits(bdev_logical_block_size(iomap->bdev)); > > > > unsigned int fs_block_size = i_blocksize(inode), pad; > > > > - unsigned int align = iov_iter_alignment(dio->submit.iter); > > > > loff_t length = iomap_length(iter); > > > > loff_t pos = iter->pos; > > > > unsigned int bio_opf; > > > > @@ -253,7 +252,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, > > > > size_t copied = 0; > > > > size_t orig_count; > > > > > > > > - if ((pos | length | align) & ((1 << blkbits) - 1)) > > > > + if ((pos | length) & ((1 << blkbits) - 1) || > > > > + !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter)) > > > > How does this change intersect with "make statx() return DIO alignment > > information" ? Will the new STATX_DIOALIGN implementations have to be > > adjusted to set stx_dio_mem_align = bdev_dma_alignment(...)? > > > > I'm guessing the answer is yes, but I haven't seen any patches on the > > list to do that, but more and more these days email behaves like a flood > > of UDP traffic... :( > > > > Yes. I haven't done that in the STATX_DIOALIGN patchset yet because I've been > basing it on upstream, which doesn't yet have this iomap patch. I haven't been > expecting STATX_DIOALIGN to make 5.20, given that it's a new UAPI that needs > time to be properly reviewed, plus I've just been busy with other things. So > I've been planning to make the above change after this patch lands upstream. Ok, I'm looking forward to it. Thank you for your work on statx! :) --D > - Eric