From patchwork Sat Dec 23 03:37:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Nan X-Patchwork-Id: 182911 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:2483:b0:fb:cd0c:d3e with SMTP id q3csp1471756dyi; Fri, 22 Dec 2023 19:41:12 -0800 (PST) X-Google-Smtp-Source: AGHT+IHKw5xJG13F883Mpdm0h9IwOM/44+vOxEEnv+Tv9VMqDtq1cTU9tl8sxSqaXUobdtD8dO22 X-Received: by 2002:a05:6870:b51f:b0:203:9e66:b8a2 with SMTP id v31-20020a056870b51f00b002039e66b8a2mr2802793oap.35.1703302871867; Fri, 22 Dec 2023 19:41:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1703302871; cv=none; d=google.com; s=arc-20160816; b=EtiATvLlLGw22iLZ5LvBWApj4gu+vNffUI17yqVVBgP39NI4Wl8BZtBBsPYyRQPdrG a4nwL5SFkj/5HH+4mdX9FFJ6ubRHRmxhfBDW895mv2FyNHxh7+ytXbEb2iHwrf8wlGGc q7c9JOasJHnVTuQCRn4ltKNnSUeb9ci65+rPy3ZxYmfIVFZzpMgbsEpJmmma9rBR1GnT jjSBdlMaafWouDj9CCEJoSTK1cJCKUYOFNQM2RptdTMf7XL8Vsag9Z0viLAIqHniF8Ty sW35n8wVCPqXSZNUBoTfqV3N5lIGy2SOX/j7i6KlOJwa32WIgDM0n2pEZeIqMEV0hAMI v6dg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from; bh=MFeUzfe4mvD2YvakoURR9wl3l6cG2BA+rnMo2l9Kmsg=; fh=KzMu/56/cZ/XdN+BRAd8A7ip70iszopujqpzmcppc/E=; b=sN+A+0xIbw+xwxZ1XdYNTeL0O6ZNHFDfbC2YR7/6vSqq+LO/0X+AzO0kFpb3x+C3vS /7BgIu56ncNrwJ48qzi900dBFsfMg526hrU4W9FWKc+rlg0/U8FHsuyH+P5+RQSrAFxw Qq9W4ccpjIhRbOp/Fxq6KMrinbcd9wjRfbL3z7fRvcVfUhWPiJw9awRA0mfnvKgFxIzy TQnCcmKG+qX91kqR6JBOxaRhTSMAQv9pBm0EQZnnqSojAdzLWTlfFczeQPCVibS68Kdk +eD4oTlxNhURWfQx6B2WPdiHpUOdUPuK4nnMKxWRsC+kx9wSVkum+6SJ2w9L7CC5h12w orWQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel+bounces-10271-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-10271-ouuuleilei=gmail.com@vger.kernel.org" Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. [2604:1380:40f1:3f00::1]) by mx.google.com with ESMTPS id y8-20020a634b08000000b005cd831a75c2si4253946pga.278.2023.12.22.19.41.11 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Dec 2023 19:41:11 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-10271-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel+bounces-10271-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-10271-ouuuleilei=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id BA5C1B2443E for ; Sat, 23 Dec 2023 03:40:08 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 503AB9441; Sat, 23 Dec 2023 03:39:17 +0000 (UTC) X-Original-To: linux-kernel@vger.kernel.org Received: from dggsgout11.his.huawei.com (unknown [45.249.212.51]) (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 ABC0210F4; Sat, 23 Dec 2023 03:39:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4Sxqf32qmVz4f3jJF; Sat, 23 Dec 2023 11:39:07 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id CB3131A08E7; Sat, 23 Dec 2023 11:39:08 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgD3Rg1aVoZl1dePEQ--.1070S5; Sat, 23 Dec 2023 11:39:08 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, axboe@kernel.dk Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linan666@huaweicloud.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 1/2] md: Fix overflow in is_mddev_idle Date: Sat, 23 Dec 2023 11:37:02 +0800 Message-Id: <20231223033703.2949831-2-linan666@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231223033703.2949831-1-linan666@huaweicloud.com> References: <20231223033703.2949831-1-linan666@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgD3Rg1aVoZl1dePEQ--.1070S5 X-Coremail-Antispam: 1UD129KBjvJXoWxXF45Zw1xGw1fur1kXw43ZFb_yoW5Ar43pF WUJFyakrWUJr4j9w4DZ3yDua4rK34ay3y3KrW7C34aqFySg3ZIqF48GFyYqF1DZFW8ZFW2 q34UKFZ0va40qrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmK14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jr4l82xGYIkIc2 x26xkF7I0E14v26r1I6r4UM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq3wAa c4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzV Aqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S 6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxw ACI402YVCY1x02628vn2kIc2xKxwAKzVCY07xG64k0F24l42xK82IYc2Ij64vIr41l4I8I 3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxV WUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAF wI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcI k0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j 6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUeYL9UUUUU X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786042511849653818 X-GMAIL-MSGID: 1786042511849653818 From: Li Nan UBSAN reports this problem: UBSAN: Undefined behaviour in drivers/md/md.c:8175:15 signed integer overflow: -2147483291 - 2072033152 cannot be represented in type 'int' Call trace: dump_backtrace+0x0/0x310 show_stack+0x28/0x38 dump_stack+0xec/0x15c ubsan_epilogue+0x18/0x84 handle_overflow+0x14c/0x19c __ubsan_handle_sub_overflow+0x34/0x44 is_mddev_idle+0x338/0x3d8 md_do_sync+0x1bb8/0x1cf8 md_thread+0x220/0x288 kthread+0x1d8/0x1e0 ret_from_fork+0x10/0x18 'curr_events' will overflow when stat accum or 'sync_io' is greater than INT_MAX. Fix it by changing sync_io, last_events and curr_events to 64bit. Signed-off-by: Li Nan Reviewed-by: Yu Kuai --- drivers/md/md.h | 4 ++-- include/linux/blkdev.h | 2 +- drivers/md/md.c | 7 ++++--- 3 files changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/md/md.h b/drivers/md/md.h index ade83af123a2..1a4f976951c1 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -50,7 +50,7 @@ struct md_rdev { sector_t sectors; /* Device size (in 512bytes sectors) */ struct mddev *mddev; /* RAID array if running */ - int last_events; /* IO event timestamp */ + long long last_events; /* IO event timestamp */ /* * If meta_bdev is non-NULL, it means that a separate device is @@ -584,7 +584,7 @@ extern void mddev_unlock(struct mddev *mddev); static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) { - atomic_add(nr_sectors, &bdev->bd_disk->sync_io); + atomic64_add(nr_sectors, &bdev->bd_disk->sync_io); } static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 3f8a21cd9233..d28b98adf457 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -170,7 +170,7 @@ struct gendisk { struct list_head slave_bdevs; #endif struct timer_rand_state *random; - atomic_t sync_io; /* RAID */ + atomic64_t sync_io; /* RAID */ struct disk_events *ev; #ifdef CONFIG_BLK_DEV_ZONED diff --git a/drivers/md/md.c b/drivers/md/md.c index c94373d64f2c..a6829ea5b560 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8496,14 +8496,15 @@ static int is_mddev_idle(struct mddev *mddev, int init) { struct md_rdev *rdev; int idle; - int curr_events; + long long curr_events; idle = 1; rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; - curr_events = (int)part_stat_read_accum(disk->part0, sectors) - - atomic_read(&disk->sync_io); + curr_events = + (long long)part_stat_read_accum(disk->part0, sectors) - + atomic64_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and * disk_stats is counted when it completes. 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[2604:1380:45e3:2400::1]) by mx.google.com with ESMTPS id je22-20020a170903265600b001d3e0015962si4237546plb.256.2023.12.22.19.39.58 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Dec 2023 19:39:58 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-10270-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel+bounces-10270-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-10270-ouuuleilei=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 2553B28382F for ; Sat, 23 Dec 2023 03:39:58 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B4ADF8BEC; Sat, 23 Dec 2023 03:39:16 +0000 (UTC) X-Original-To: linux-kernel@vger.kernel.org Received: from dggsgout11.his.huawei.com (unknown [45.249.212.51]) (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 ABBCDED9; Sat, 23 Dec 2023 03:39:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4Sxqdz6grDz4f3lCy; Sat, 23 Dec 2023 11:39:03 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 39A331A0743; Sat, 23 Dec 2023 11:39:09 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgD3Rg1aVoZl1dePEQ--.1070S6; Sat, 23 Dec 2023 11:39:09 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, axboe@kernel.dk Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linan666@huaweicloud.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 2/2] md: don't account sync_io if iostats of the disk is disabled Date: Sat, 23 Dec 2023 11:37:03 +0800 Message-Id: <20231223033703.2949831-3-linan666@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231223033703.2949831-1-linan666@huaweicloud.com> References: <20231223033703.2949831-1-linan666@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgD3Rg1aVoZl1dePEQ--.1070S6 X-Coremail-Antispam: 1UD129KBjvJXoW7KFWxKF4kKr1xuF15Jr4DCFg_yoW8XryfpF Z5AF9ay34UXr45Wa4DXryDCa4rW3srKFWUArW7u3yfXFyaqr9xGFWrXayqqF1DXFWrGFWa v3Wjy39093W0yr7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmK14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26r4j6ryUM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq3wAa c4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzV Aqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S 6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxw ACI402YVCY1x02628vn2kIc2xKxwAKzVCY07xG64k0F24l42xK82IYc2Ij64vIr41l4I8I 3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxV WUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAF wI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcI k0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j 6r4UJbIYCTnIWIevJa73UjIFyTuYvjfU1xhLUUUUU X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786042435436000876 X-GMAIL-MSGID: 1786042435436000876 From: Li Nan If iostats is disabled, disk_stats will not be updated and part_stat_read_accum() only returns a constant value. In this case, continuing to count sync_io and to check is_mddev_idle() is no longer meaningful. Signed-off-by: Li Nan --- drivers/md/md.h | 3 ++- drivers/md/md.c | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/md/md.h b/drivers/md/md.h index 1a4f976951c1..e2d03a7a858c 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -584,7 +584,8 @@ extern void mddev_unlock(struct mddev *mddev); static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) { - atomic64_add(nr_sectors, &bdev->bd_disk->sync_io); + if (blk_queue_io_stat(bdev->bd_disk->queue)) + atomic64_add(nr_sectors, &bdev->bd_disk->sync_io); } static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) diff --git a/drivers/md/md.c b/drivers/md/md.c index a6829ea5b560..b56614eae8dc 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8502,6 +8502,10 @@ static int is_mddev_idle(struct mddev *mddev, int init) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; + + if (!blk_queue_io_stat(disk->queue)) + continue; + curr_events = (long long)part_stat_read_accum(disk->part0, sectors) - atomic64_read(&disk->sync_io);