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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1BC7FC4332F for ; Thu, 28 Oct 2021 01:33:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09D92611C3 for ; Thu, 28 Oct 2021 01:33:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229801AbhJ1Bfk (ORCPT ); Wed, 27 Oct 2021 21:35:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229829AbhJ1Bfg (ORCPT ); Wed, 27 Oct 2021 21:35:36 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6F8EC061745 for ; Wed, 27 Oct 2021 18:33:10 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id k2-20020a17090ac50200b001a218b956aaso3440493pjt.2 for ; Wed, 27 Oct 2021 18:33:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20210112.gappssmtp.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pAiaBNCk1xnEBH3C9EMpKzrgqAPJnlmXDrtIiJ0dt1I=; b=pAV9PI3uqSjbwl4ehA+e1fD0AmJsR9RObZKjbvBijn3hthsC3BOWhi8AwEhKayTbAn +kULxKOjbDPkdJvduTRaYnTinwRQ3sTGC3RmXxOu+ZBFQAZP2dCfU0u+xx+MyQD5sCXu juQ8/OlFDYxVdxNYORCgy1YjcIYTJ/VbxjTb7UxVpCGr1z8kM8Yws8W6G4x0NWwc6hyB NrmNiLX5o2T12KN42PUJoRgcExOicwbK7jy2OCO7u+1RAggFonc1ris6SaZqTakBedPe +KiIfancYaA+JSRyfWPQcobeLcn00lylDFmKvFb7FlRzM0bgeIYcMRtTDSe9GGiatzrv LAlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pAiaBNCk1xnEBH3C9EMpKzrgqAPJnlmXDrtIiJ0dt1I=; b=2NkO9nTdF6MvVcyGIRNVv7vqds2GuPG2YpZmNNvnXTQaNv0MuB8JDSfVOux/X4wJPX 3Y0D6qYM+97WeIPaRscksajI+HMpxD8AAhZV74kjVKCbDijiHVuEs9pJyg/ckjMLrCAY IEDNOlV6wTkKqndFtEvEwE9GgUIZHL3QXAOkd/xHuEKvLhdh3qaAIb27bzL/aLcocCEB N3m4NKow8YnLd3XL/s/q4sWkKKSZgWNTdSJuAJdoBzLtV0aZyTLXmJEmtOq8Wcg2psey rCOeJkFTUpXYWjj8vQ7kdizoZeX7Tx1m6OwOXjG9Muaj2BrUAdbIcEUAb1btMA59l9zN a36g== X-Gm-Message-State: AOAM53379fUB2ws3IjTdHrCo4n8YyrTtfzPwhh22HBhS8cJIA9m0sKnf b681HoTZeNDc3mnH8G1/mOCgJ9bv97Lm/nFYp7x3Rg== X-Google-Smtp-Source: ABdhPJxm6eCpHzum4moJkAnlQxDuj0JlmT3Vix8IBxxMECN3GUzGEt1VHXlaU6FsHMYZFBw/KnWLJLzVXyU36Brr9pk= X-Received: by 2002:a17:90b:3b88:: with SMTP id pc8mr1221700pjb.93.1635384790364; Wed, 27 Oct 2021 18:33:10 -0700 (PDT) MIME-Version: 1.0 References: <20211018044054.1779424-1-hch@lst.de> <20211018044054.1779424-9-hch@lst.de> In-Reply-To: <20211018044054.1779424-9-hch@lst.de> From: Dan Williams Date: Wed, 27 Oct 2021 18:32:58 -0700 Message-ID: Subject: Re: [PATCH 08/11] dm-linear: add a linear_dax_pgoff helper To: Christoph Hellwig , Mike Snitzer Cc: Ira Weiny , device-mapper development , linux-xfs , Linux NVDIMM , linux-s390 , linux-fsdevel , linux-erofs@lists.ozlabs.org, linux-ext4 , virtualization@lists.linux-foundation.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On Sun, Oct 17, 2021 at 9:41 PM Christoph Hellwig wrote: > > Add a helper to perform the entire remapping for DAX accesses. This > helper open codes bdev_dax_pgoff given that the alignment checks have > already been done by the submitting file system and don't need to be > repeated. Looks good. Mike, ack? > > Signed-off-by: Christoph Hellwig > --- > drivers/md/dm-linear.c | 49 +++++++++++++----------------------------- > 1 file changed, 15 insertions(+), 34 deletions(-) > > diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c > index 32fbab11bf90c..bf03f73fd0f36 100644 > --- a/drivers/md/dm-linear.c > +++ b/drivers/md/dm-linear.c > @@ -164,63 +164,44 @@ static int linear_iterate_devices(struct dm_target *ti, > } > > #if IS_ENABLED(CONFIG_FS_DAX) > +static struct dax_device *linear_dax_pgoff(struct dm_target *ti, pgoff_t *pgoff) > +{ > + struct linear_c *lc = ti->private; > + sector_t sector = linear_map_sector(ti, *pgoff << PAGE_SECTORS_SHIFT); > + > + *pgoff = (get_start_sect(lc->dev->bdev) + sector) >> PAGE_SECTORS_SHIFT; > + return lc->dev->dax_dev; > +} > + > static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, > long nr_pages, void **kaddr, pfn_t *pfn) > { > - long ret; > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > - > - dev_sector = linear_map_sector(ti, sector); > - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff); > - if (ret) > - return ret; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > + > return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn); > } > > static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, > void *addr, size_t bytes, struct iov_iter *i) > { > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > > - dev_sector = linear_map_sector(ti, sector); > - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) > - return 0; > return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); > } > > static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, > void *addr, size_t bytes, struct iov_iter *i) > { > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > > - dev_sector = linear_map_sector(ti, sector); > - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) > - return 0; > return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); > } > > static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, > size_t nr_pages) > { > - int ret; > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > - > - dev_sector = linear_map_sector(ti, sector); > - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff); > - if (ret) > - return ret; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > + > return dax_zero_page_range(dax_dev, pgoff, nr_pages); > } > > -- > 2.30.2 >