From patchwork Tue Jul 28 13:59:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Coly Li X-Patchwork-Id: 11689231 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 819ED6C1 for ; Tue, 28 Jul 2020 13:59:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 735B92075D for ; Tue, 28 Jul 2020 13:59:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730278AbgG1N7c (ORCPT ); Tue, 28 Jul 2020 09:59:32 -0400 Received: from mx2.suse.de ([195.135.220.15]:51566 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730056AbgG1N7c (ORCPT ); Tue, 28 Jul 2020 09:59:32 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 318EFB130; Tue, 28 Jul 2020 13:59:42 +0000 (UTC) From: colyli@suse.de To: axboe@kernel.dk Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, Coly Li , Christoph Hellwig , stable@vger.kernel.org Subject: [PATCH] bcache: use disk_{start,end}_io_acct() to count I/O for bcache device Date: Tue, 28 Jul 2020 21:59:20 +0800 Message-Id: <20200728135920.4618-1-colyli@suse.de> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Coly Li This patch is a fix to patch "bcache: fix bio_{start,end}_io_acct with proper device". The previous patch uses a hack to temporarily set bi_disk to bcache device, which is mistaken too. As Christoph suggests, this patch uses disk_{start,end}_io_acct() to count I/O for bcache device in the correct way. Fixes: 85750aeb748f ("bcache: use bio_{start,end}_io_acct") Signed-off-by: Coly Li Cc: Christoph Hellwig Cc: stable@vger.kernel.org --- drivers/md/bcache/request.c | 37 +++++++++---------------------------- 1 file changed, 9 insertions(+), 28 deletions(-) diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index 8ea0f079c1d0..9cc044293acd 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -617,28 +617,6 @@ static void cache_lookup(struct closure *cl) /* Common code for the make_request functions */ -static inline void bch_bio_start_io_acct(struct gendisk *acct_bi_disk, - struct bio *bio, - unsigned long *start_time) -{ - struct gendisk *saved_bi_disk = bio->bi_disk; - - bio->bi_disk = acct_bi_disk; - *start_time = bio_start_io_acct(bio); - bio->bi_disk = saved_bi_disk; -} - -static inline void bch_bio_end_io_acct(struct gendisk *acct_bi_disk, - struct bio *bio, - unsigned long start_time) -{ - struct gendisk *saved_bi_disk = bio->bi_disk; - - bio->bi_disk = acct_bi_disk; - bio_end_io_acct(bio, start_time); - bio->bi_disk = saved_bi_disk; -} - static void request_endio(struct bio *bio) { struct closure *cl = bio->bi_private; @@ -690,7 +668,9 @@ static void backing_request_endio(struct bio *bio) static void bio_complete(struct search *s) { if (s->orig_bio) { - bch_bio_end_io_acct(s->d->disk, s->orig_bio, s->start_time); + /* Count on bcache device */ + disk_end_io_acct(s->d->disk, bio_op(s->orig_bio), s->start_time); + trace_bcache_request_end(s->d, s->orig_bio); s->orig_bio->bi_status = s->iop.status; bio_endio(s->orig_bio); @@ -750,8 +730,8 @@ static inline struct search *search_alloc(struct bio *bio, s->recoverable = 1; s->write = op_is_write(bio_op(bio)); s->read_dirty_data = 0; - bch_bio_start_io_acct(d->disk, bio, &s->start_time); - + /* Count on the bcache device */ + s->start_time = disk_start_io_acct(d->disk, bio_sectors(bio), bio_op(bio)); s->iop.c = d->c; s->iop.bio = NULL; s->iop.inode = d->id; @@ -1102,7 +1082,8 @@ static void detached_dev_end_io(struct bio *bio) bio->bi_end_io = ddip->bi_end_io; bio->bi_private = ddip->bi_private; - bch_bio_end_io_acct(ddip->d->disk, bio, ddip->start_time); + /* Count on the bcache device */ + disk_end_io_acct(ddip->d->disk, bio_op(bio), ddip->start_time); if (bio->bi_status) { struct cached_dev *dc = container_of(ddip->d, @@ -1127,8 +1108,8 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio) */ ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO); ddip->d = d; - bch_bio_start_io_acct(d->disk, bio, &ddip->start_time); - + /* Count on the bcache device */ + ddip->start_time = disk_start_io_acct(d->disk, bio_sectors(bio), bio_op(bio)); ddip->bi_end_io = bio->bi_end_io; ddip->bi_private = bio->bi_private; bio->bi_end_io = detached_dev_end_io;