From nobody Sun Nov 10 02:53:54 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD938C77B73 for ; Sat, 27 May 2023 07:42:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234724AbjE0HmC (ORCPT ); Sat, 27 May 2023 03:42:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232327AbjE0Hll (ORCPT ); Sat, 27 May 2023 03:41:41 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C317C9; Sat, 27 May 2023 00:41:40 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4QStZN1r8Xz4f3w0G; Sat, 27 May 2023 15:23:56 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgD3rLAKsHFk67lAKQ--.30654S5; Sat, 27 May 2023 15:23:57 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, bingjingc@synology.com, allenpeng@synology.com, shli@fb.com, alexwu@synology.com, neilb@suse.de Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linan122@huawei.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 1/4] md/raid10: fix null-ptr-deref of mreplace in raid10_sync_request Date: Sat, 27 May 2023 15:22:15 +0800 Message-Id: <20230527072218.2365857-2-linan666@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230527072218.2365857-1-linan666@huaweicloud.com> References: <20230527072218.2365857-1-linan666@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgD3rLAKsHFk67lAKQ--.30654S5 X-Coremail-Antispam: 1UD129KBjvJXoW7CFWDZw45AFyrZr45uFy8Zrb_yoW5JrWDpa y3tF9rJ34UG3yjka1DJ3ZruF1S9asrJw15Cry5W343Zr1agrWDCay8WFWYqFyDXF4Yvw4Y qw1jyws8CFy7Xa7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUm0b4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUGw A2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrV ACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWU JVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2 ka0xkIwI1lw4CEc2x0rVAKj4xxMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j 6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7 AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE 2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcV C2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVj vjDU0xZFpf9x07jYFALUUUUU= X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Li Nan There are two check of 'mreplace' in raid10_sync_request(). In the first check, 'need_replace' will be set and 'mreplace' will be used later if no-Faulty 'mreplace' exists, In the second check, 'mreplace' will be set to NULL if it is Faulty, but 'need_replace' will not be changed accordingly. null-ptr-deref occurs if Faulty is set between two check. Fix it by merging two checks into one. And replace 'need_replace' with 'mreplace' because their values are always the same. Fixes: ee37d7314a32 ("md/raid10: Fix raid10 replace hang when new added dis= k faulty") Signed-off-by: Li Nan Reviewed-by: Yu Kuai --- drivers/md/raid10.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 4fcfcb350d2b..0acb4c103c10 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3438,7 +3438,6 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, int must_sync; int any_working; int need_recover =3D 0; - int need_replace =3D 0; struct raid10_info *mirror =3D &conf->mirrors[i]; struct md_rdev *mrdev, *mreplace; =20 @@ -3450,11 +3449,10 @@ static sector_t raid10_sync_request(struct mddev *m= ddev, sector_t sector_nr, !test_bit(Faulty, &mrdev->flags) && !test_bit(In_sync, &mrdev->flags)) need_recover =3D 1; - if (mreplace !=3D NULL && - !test_bit(Faulty, &mreplace->flags)) - need_replace =3D 1; + if (mreplace && test_bit(Faulty, &mreplace->flags)) + mreplace =3D NULL; =20 - if (!need_recover && !need_replace) { + if (!need_recover && !mreplace) { rcu_read_unlock(); continue; } @@ -3470,8 +3468,6 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, rcu_read_unlock(); continue; } - if (mreplace && test_bit(Faulty, &mreplace->flags)) - mreplace =3D NULL; /* Unless we are doing a full sync, or a replacement * we only need to recover the block if it is set in * the bitmap @@ -3594,11 +3590,11 @@ static sector_t raid10_sync_request(struct mddev *m= ddev, sector_t sector_nr, bio =3D r10_bio->devs[1].repl_bio; if (bio) bio->bi_end_io =3D NULL; - /* Note: if need_replace, then bio + /* Note: if replace is not NULL, then bio * cannot be NULL as r10buf_pool_alloc will * have allocated it. */ - if (!need_replace) + if (!mreplace) break; bio->bi_next =3D biolist; biolist =3D bio; --=20 2.31.1 From nobody Sun Nov 10 02:53:54 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4913C77B7E for ; Sat, 27 May 2023 07:41:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232483AbjE0Hlz (ORCPT ); Sat, 27 May 2023 03:41:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232321AbjE0Hll (ORCPT ); Sat, 27 May 2023 03:41:41 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FA64BC; Sat, 27 May 2023 00:41:39 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4QStZN5Xq7z4f3w0L; Sat, 27 May 2023 15:23:56 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgD3rLAKsHFk67lAKQ--.30654S6; Sat, 27 May 2023 15:23:57 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, bingjingc@synology.com, allenpeng@synology.com, shli@fb.com, alexwu@synology.com, neilb@suse.de Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linan122@huawei.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 2/4] md/raid10: improve code of mrdev in raid10_sync_request Date: Sat, 27 May 2023 15:22:16 +0800 Message-Id: <20230527072218.2365857-3-linan666@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230527072218.2365857-1-linan666@huaweicloud.com> References: <20230527072218.2365857-1-linan666@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgD3rLAKsHFk67lAKQ--.30654S6 X-Coremail-Antispam: 1UD129KBjvJXoWxZrWxCw45uFWxtr45KFy8Xwb_yoW5Ar17p3 y3tFyayryUJ3yUGF1DA3WDuF1SvrWxtayYyrW7W34xGw1SgryDCa4rWFWYqF1UZFWrXw15 Xw1UJws8Ca4IqF7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUm0b4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUXw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrV ACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWU JVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2 ka0xkIwI1lw4CEc2x0rVAKj4xxMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j 6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7 AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE 2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcV C2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVj vjDU0xZFpf9x07UNAwxUUUUU= X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Li Nan 'need_recover' and 'mrdev' are equivalent in raid10_sync_request(), and inc mrdev->nr_pending is unreasonable if don't need recovery. Replace 'need_recover' with 'mrdev', and only inc nr_pending when needed. Signed-off-by: Li Nan Reviewed-by: Yu Kuai --- drivers/md/raid10.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 0acb4c103c10..d93d8cb2b620 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3437,7 +3437,6 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, sector_t sect; int must_sync; int any_working; - int need_recover =3D 0; struct raid10_info *mirror =3D &conf->mirrors[i]; struct md_rdev *mrdev, *mreplace; =20 @@ -3445,14 +3444,13 @@ static sector_t raid10_sync_request(struct mddev *m= ddev, sector_t sector_nr, mrdev =3D rcu_dereference(mirror->rdev); mreplace =3D rcu_dereference(mirror->replacement); =20 - if (mrdev !=3D NULL && - !test_bit(Faulty, &mrdev->flags) && - !test_bit(In_sync, &mrdev->flags)) - need_recover =3D 1; + if (mrdev && (test_bit(Faulty, &mrdev->flags) || + test_bit(In_sync, &mrdev->flags))) + mrdev =3D NULL; if (mreplace && test_bit(Faulty, &mreplace->flags)) mreplace =3D NULL; =20 - if (!need_recover && !mreplace) { + if (!mrdev && !mreplace) { rcu_read_unlock(); continue; } @@ -3486,7 +3484,8 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, rcu_read_unlock(); continue; } - atomic_inc(&mrdev->nr_pending); + if (mrdev) + atomic_inc(&mrdev->nr_pending); if (mreplace) atomic_inc(&mreplace->nr_pending); rcu_read_unlock(); @@ -3573,7 +3572,7 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, r10_bio->devs[1].devnum =3D i; r10_bio->devs[1].addr =3D to_addr; =20 - if (need_recover) { + if (mrdev) { bio =3D r10_bio->devs[1].bio; bio->bi_next =3D biolist; biolist =3D bio; @@ -3618,7 +3617,7 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, for (k =3D 0; k < conf->copies; k++) if (r10_bio->devs[k].devnum =3D=3D i) break; - if (!test_bit(In_sync, + if (mrdev && !test_bit(In_sync, &mrdev->flags) && !rdev_set_badblocks( mrdev, @@ -3644,12 +3643,14 @@ static sector_t raid10_sync_request(struct mddev *m= ddev, sector_t sector_nr, if (rb2) atomic_dec(&rb2->remaining); r10_bio =3D rb2; - rdev_dec_pending(mrdev, mddev); + if (mrdev) + rdev_dec_pending(mrdev, mddev); if (mreplace) rdev_dec_pending(mreplace, mddev); break; } - rdev_dec_pending(mrdev, mddev); + if (mrdev) + rdev_dec_pending(mrdev, mddev); if (mreplace) rdev_dec_pending(mreplace, mddev); if (r10_bio->devs[0].bio->bi_opf & MD_FAILFAST) { --=20 2.31.1 From nobody Sun Nov 10 02:53:54 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BA310C77B7E for ; Sat, 27 May 2023 07:42:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232640AbjE0Hl7 (ORCPT ); Sat, 27 May 2023 03:41:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232185AbjE0Hll (ORCPT ); Sat, 27 May 2023 03:41:41 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 949F1B1; Sat, 27 May 2023 00:41:38 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4QStZP27SJz4f3w0P; Sat, 27 May 2023 15:23:57 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgD3rLAKsHFk67lAKQ--.30654S7; Sat, 27 May 2023 15:23:58 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, bingjingc@synology.com, allenpeng@synology.com, shli@fb.com, alexwu@synology.com, neilb@suse.de Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linan122@huawei.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 3/4] md/raid10: fix incorrect done of recovery Date: Sat, 27 May 2023 15:22:17 +0800 Message-Id: <20230527072218.2365857-4-linan666@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230527072218.2365857-1-linan666@huaweicloud.com> References: <20230527072218.2365857-1-linan666@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgD3rLAKsHFk67lAKQ--.30654S7 X-Coremail-Antispam: 1UD129KBjvJXoW7AFyktF13tF17GFWDXr17GFg_yoW8ur4fpa n3JFZ3tr98WayfJ3WDAryUXFWFy348J347Kr4xW34j9F9YqrWDZFWfXFWUXFyDWr1FqayY qw4DJrW5CFyxKaDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmYb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUWw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrV ACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWU JVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2 ka0xkIwI1lw4CEc2x0rVAKj4xxMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j 6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7 AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE 2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0x vEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIev Ja73UjIFyTuYvjxUwfHjUUUUU X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Li Nan Recovery will go to giveup and let chunks_skipped++ in raid10_sync_request() if there are some bad_blocks, and it will return max_sector when chunks_skipped >=3D geo.raid_disks. Now, recovery fail and data is inconsistent but user think recovery is done, it is wrong. Fix it by set mirror's recovery_disabled, spare device will not be added to here. The same issue alos exists on resync, it will be fixd in future. Signed-off-by: Li Nan --- drivers/md/raid10.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index d93d8cb2b620..3ba1516ea160 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3303,6 +3303,7 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, int chunks_skipped =3D 0; sector_t chunk_mask =3D conf->geo.chunk_mask; int page_idx =3D 0; + int error_disk =3D -1; =20 /* * Allow skipping a full rebuild for incremental assembly @@ -3386,7 +3387,20 @@ static sector_t raid10_sync_request(struct mddev *md= dev, sector_t sector_nr, return reshape_request(mddev, sector_nr, skipped); =20 if (chunks_skipped >=3D conf->geo.raid_disks) { - /* if there has been nothing to do on any drive, + pr_err("md/raid10:%s: %s fail\n", mdname(mddev), + test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? "resync" : "recovery"); + if (error_disk >=3D 0 && + !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + /* + * recovery fail, set mirrors.recovory_disabled, + * device shouldn't be added to there. + */ + conf->mirrors[error_disk].recovery_disabled =3D + mddev->recovery_disabled; + return 0; + } + /* + * if there has been nothing to do on any drive, * then there is nothing to do at all.. */ *skipped =3D 1; @@ -3638,6 +3652,8 @@ static sector_t raid10_sync_request(struct mddev *mdd= ev, sector_t sector_nr, mdname(mddev)); mirror->recovery_disabled =3D mddev->recovery_disabled; + } else { + error_disk =3D i; } put_buf(r10_bio); if (rb2) --=20 2.31.1 From nobody Sun Nov 10 02:53:54 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9D17C7EE2F for ; Sat, 27 May 2023 07:41:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232410AbjE0Hlp (ORCPT ); Sat, 27 May 2023 03:41:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232145AbjE0Hlk (ORCPT ); Sat, 27 May 2023 03:41:40 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63A7490; Sat, 27 May 2023 00:41:38 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4QStZP5ZrTz4f3w0V; Sat, 27 May 2023 15:23:57 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.127.227]) by APP4 (Coremail) with SMTP id gCh0CgD3rLAKsHFk67lAKQ--.30654S8; Sat, 27 May 2023 15:23:58 +0800 (CST) From: linan666@huaweicloud.com To: song@kernel.org, bingjingc@synology.com, allenpeng@synology.com, shli@fb.com, alexwu@synology.com, neilb@suse.de Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linan122@huawei.com, yukuai3@huawei.com, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com Subject: [PATCH v3 4/4] md/raid10: fix io loss while replacement replace rdev Date: Sat, 27 May 2023 15:22:18 +0800 Message-Id: <20230527072218.2365857-5-linan666@huaweicloud.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230527072218.2365857-1-linan666@huaweicloud.com> References: <20230527072218.2365857-1-linan666@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgD3rLAKsHFk67lAKQ--.30654S8 X-Coremail-Antispam: 1UD129KBjvJXoW7tFWkCrWkKr4xKrykJry8AFb_yoW8Kr1xpF 4DK3W5ZryUAwsFgFs8AF4DJa4S9rWxtFs5Jry3W343ua1rtrWUAay7GrW3Zrs8ZFWDXryY qa13Kws5u3W7KFDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmIb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E 14v26rxl6s0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxV A2Y2ka0xkIwI1lw4CEc2x0rVAKj4xxMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY 6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17 CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF 0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMI IF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJbIYCTnI WIevJa73UjIFyTuYvjxUwZ2-UUUUU X-CM-SenderInfo: polqt0awwwqx5xdzvxpfor3voofrz/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Li Nan When we remove a disk which has replacement, first set rdev to NULL and then set replacement to rdev, finally set replacement to NULL (see raid10_remove_disk()). If io is submitted during the same time, it might read both rdev and replacement as NULL, and io will not be submitted. rdev -> NULL read rdev replacement -> NULL read replacement Fix it by reading replacement first and rdev later, meanwhile, use smp_mb() to prevent memory reordering. Fixes: 475b0321a4df ("md/raid10: writes should get directed to replacement = as well as original.") Signed-off-by: Li Nan Reviewed-by: Yu Kuai --- drivers/md/raid10.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 3ba1516ea160..a7830d2c7477 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -779,8 +779,16 @@ static struct md_rdev *read_balance(struct r10conf *co= nf, disk =3D r10_bio->devs[slot].devnum; rdev =3D rcu_dereference(conf->mirrors[disk].replacement); if (rdev =3D=3D NULL || test_bit(Faulty, &rdev->flags) || - r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) + r10_bio->devs[slot].addr + sectors > + rdev->recovery_offset) { + /* + * Read replacement first to prevent reading both rdev + * and replacement as NULL during replacement replace + * rdev. + */ + smp_mb(); rdev =3D rcu_dereference(conf->mirrors[disk].rdev); + } if (rdev =3D=3D NULL || test_bit(Faulty, &rdev->flags)) continue; @@ -1479,9 +1487,15 @@ static void raid10_write_request(struct mddev *mddev= , struct bio *bio, =20 for (i =3D 0; i < conf->copies; i++) { int d =3D r10_bio->devs[i].devnum; - struct md_rdev *rdev =3D rcu_dereference(conf->mirrors[d].rdev); - struct md_rdev *rrdev =3D rcu_dereference( - conf->mirrors[d].replacement); + struct md_rdev *rdev, *rrdev; + + rrdev =3D rcu_dereference(conf->mirrors[d].replacement); + /* + * Read replacement first to Prevent reading both rdev and + * replacement as NULL during replacement replace rdev. + */ + smp_mb(); + rdev =3D rcu_dereference(conf->mirrors[d].rdev); if (rdev =3D=3D rrdev) rrdev =3D NULL; if (rdev && (test_bit(Faulty, &rdev->flags))) --=20 2.31.1