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Fri, 02 Feb 2024 10:12:11 +0800 (CST) Subject: Re: [PATCH v5 7/8] md: sync blockdev before stopping raid or setting readonly To: linan666@huaweicloud.com, song@kernel.org, neilb@suse.com, mariusz.tkaczyk@linux.intel.com, shli@fb.com Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com, "yukuai (C)" References: <20240201063404.772797-1-linan666@huaweicloud.com> <20240201063404.772797-8-linan666@huaweicloud.com> From: Yu Kuai Message-ID: <8f6a305f-75ed-f103-4a52-9e88699d9289@huaweicloud.com> Date: Fri, 2 Feb 2024 10:12:08 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20240201063404.772797-8-linan666@huaweicloud.com> Content-Type: text/plain; charset=gbk; format=flowed Content-Transfer-Encoding: 8bit X-CM-TRANSID:cCh0CgAX6RF5T7xlnLvRCg--.22766S3 X-Coremail-Antispam: 1UD129KBjvJXoW7tF13uFWfKr13Xw1DXFyDtrb_yoW8ZFyxpa 1vyFy5Wr1Ut3sxtw17ua1kWa45Ww1xtFWDKrWay348ZFy7AwnxGrs0gr4YqrykK34fCw4I qa15uFsagas7Kr7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9214x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvEwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2Y2ka 0xkIwI1lc7I2V7IY0VAS07AlzVAYIcxG8wCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7x kEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E 67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCw CI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6rWUJVWr Zr1UMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYx BIdaVFxhVjvjDU0xZFpf9x0JUdHUDUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ Hi, ?? 2024/02/01 14:34, linan666@huaweicloud.com ะด??: > From: Li Nan > > Commit a05b7ea03d72 ("md: avoid crash when stopping md array races > with closing other open fds.") added sync_block before stopping raid and > setting readonly. Later in commit 260fa034ef7a ("md: avoid deadlock when > dirty buffers during md_stop.") it is moved to ioctl. array_state_store() > was ignored. Add sync blockdev to array_state_store() now. You're not just adding sync_blockdev() here. Please rewrite the tittle and commit message. > > Signed-off-by: Li Nan > --- > drivers/md/md.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/md/md.c b/drivers/md/md.c > index 4c7a0225f77d..86becf0015f5 100644 > --- a/drivers/md/md.c > +++ b/drivers/md/md.c > @@ -4493,6 +4493,16 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) > case broken: /* cannot be set */ > case bad_word: > return -EINVAL; > + case clear: > + case readonly: > + case inactive: > + case read_auto: > + if (!mddev->pers || !md_is_rdwr(mddev)) > + break; > + err = mddev_set_closing_and_sync_blockdev(mddev); In this context, mddev->openers should be zero, and such check is in do_md_stop() and md_set_readonly(): if (atomic_read(&mddev->openers) > !!bdev). Thanks, Kuai > + if (err) > + return err; > + break; > default: > break; > } > @@ -4518,6 +4528,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) > spin_unlock(&mddev->lock); > return err ?: len; > } > + > err = mddev_lock(mddev); > if (err) > return err; > @@ -4592,6 +4603,11 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len) > sysfs_notify_dirent_safe(mddev->sysfs_state); > } > mddev_unlock(mddev); > + > + if (st == readonly || st == read_auto || st == inactive || > + (err && st == clear)) > + clear_bit(MD_CLOSING, &mddev->flags); > + > return err ?: len; > } > static struct md_sysfs_entry md_array_state = >