From patchwork Tue Feb 22 15:51:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12755530 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.subspace.kernel.org (Postfix) with ESMTPS id C942A66A1 for ; Tue, 22 Feb 2022 15:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=PMHViAJhEEv7jlvdbpFwU2YaZRdIC4g9mzG7ynUcv90=; b=wxABwN0ujck+tDQz82qITDMWOE 6vVGG/pJNlX68EPkavkRShaHap7ajnipbIeG8oEgmOp1SZVHxB22EWHfYotsB0yPpaBK2ahW5GW+S 8kzRGNNrOY11nvQqgiLNriwVitBtd8uzT0JMvcE41H5PSjci6aphpvknzw35Cx+hlhNDN1ZUx6DDU xSR8xlHPN9Fga+jfQTBEObFGdOtokX4iZgsSBa3+/oXytAveNQIir8hIJjYF5VsYUA06b1BxysoPk pX+cgXqME+0qSMx+zXD6Ohjhqpk2PuhzcbhrNQrhQui/bqnruaKtwABNcY2noAg2JjOqigijr4wgx +LtsvjUw==; Received: from [2001:4bb8:198:f8fc:c22a:ebfc:be8d:63c2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMXSi-00AQ1t-CM; Tue, 22 Feb 2022 15:52:24 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Chris Zankel , Max Filippov , Justin Sanders , Philipp Reisner , Lars Ellenberg , Denis Efremov , Minchan Kim , Nitin Gupta , Coly Li , Dan Williams , Vishal Verma , linux-xtensa@linux-xtensa.org, linux-block@vger.kernel.org, drbd-dev@lists.linbit.com, linux-bcache@vger.kernel.org, nvdimm@lists.linux.dev Subject: [PATCH 09/10] drbd: use bvec_kmap_local in recv_dless_read Date: Tue, 22 Feb 2022 16:51:55 +0100 Message-Id: <20220222155156.597597-10-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220222155156.597597-1-hch@lst.de> References: <20220222155156.597597-1-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Using local kmaps slightly reduces the chances to stray writes, and the bvec interface cleans up the code a little bit. Signed-off-by: Christoph Hellwig Reviewed-by: Ira Weiny --- drivers/block/drbd/drbd_receiver.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 04e3ec12d8b49..fa00cf2ea9529 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -2017,10 +2017,10 @@ static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_req D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); bio_for_each_segment(bvec, bio, iter) { - void *mapped = kmap(bvec.bv_page) + bvec.bv_offset; + void *mapped = bvec_kmap_local(&bvec); expect = min_t(int, data_size, bvec.bv_len); err = drbd_recv_all_warn(peer_device->connection, mapped, expect); - kunmap(bvec.bv_page); + kunmap_local(mapped); if (err) return err; data_size -= expect;