From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C505FC433E0 for ; Mon, 8 Feb 2021 10:55:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 44A9364E45 for ; Mon, 8 Feb 2021 10:55:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 44A9364E45 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=cn.fujitsu.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E8A6C6B0074; Mon, 8 Feb 2021 05:55:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DE6336B0075; Mon, 8 Feb 2021 05:55:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CB1BE6B0078; Mon, 8 Feb 2021 05:55:43 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0222.hostedemail.com [216.40.44.222]) by kanga.kvack.org (Postfix) with ESMTP id AFEC96B0074 for ; Mon, 8 Feb 2021 05:55:43 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 75E8A1EE6 for ; Mon, 8 Feb 2021 10:55:43 +0000 (UTC) X-FDA: 77794794966.19.air58_0a0e750275fe Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin19.hostedemail.com (Postfix) with ESMTP id 5617A1AD1BA for ; Mon, 8 Feb 2021 10:55:43 +0000 (UTC) X-HE-Tag: air58_0a0e750275fe X-Filterd-Recvd-Size: 5448 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Mon, 8 Feb 2021 10:55:42 +0000 (UTC) X-IronPort-AV: E=Sophos;i="5.81,161,1610380800"; d="scan'208";a="104328064" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 08 Feb 2021 18:55:40 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 58EDC4CE6F82; Mon, 8 Feb 2021 18:55:37 +0800 (CST) Received: from G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.200) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 8 Feb 2021 18:55:40 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 8 Feb 2021 18:55:39 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , , , Subject: [PATCH v3 04/11] block_dev: Introduce bd_corrupted_range() for block device Date: Mon, 8 Feb 2021 18:55:23 +0800 Message-ID: <20210208105530.3072869-5-ruansy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210208105530.3072869-1-ruansy.fnst@cn.fujitsu.com> References: <20210208105530.3072869-1-ruansy.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-yoursite-MailScanner-ID: 58EDC4CE6F82.A0C98 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@cn.fujitsu.com Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: As is show in the call tree: ... pgmap->ops->memory_failure() gendisk->fops->corrupted_range() sb->s_ops->currupted_range() ... currupted_range() is called from disk(pmem) to superblock(filesystem). Thus, we need to introduce a helper function to obtain the superblock from a given disk. Normally, a filesystem can be created by mkfs directly on a block device or a parted disk. We can obtain the superblock by calling get_super(). But get_super() is not suitable for mapped device, such as LVM. To obtain MD's superblock, we can iterate bd_holder_disks of a block device to find out the MD that contains it. By this way, MD is able to call corrupted_range() from its target block device. Signed-off-by: Shiyang Ruan --- fs/block_dev.c | 47 ++++++++++++++++++++++++++++++++++++++++++- include/linux/genhd.h | 2 ++ 2 files changed, 48 insertions(+), 1 deletion(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 3b8963e228a1..755b0d351479 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1079,6 +1079,28 @@ struct bd_holder_disk { int refcnt; }; =20 +static int bd_disk_holder_corrupted_range(struct block_device *bdev, lof= f_t off, + size_t len, void *data) +{ + struct bd_holder_disk *holder; + struct gendisk *disk; + int rc =3D 0; + + if (list_empty(&(bdev->bd_holder_disks))) + return -ENODEV; + + list_for_each_entry(holder, &bdev->bd_holder_disks, list) { + disk =3D holder->disk; + if (disk->fops->corrupted_range) { + rc =3D disk->fops->corrupted_range(disk, bdev, off, + len, data); + if (rc !=3D -ENODEV) + break; + } + } + return rc; +} + static struct bd_holder_disk *bd_find_holder_disk(struct block_device *b= dev, struct gendisk *disk) { @@ -1212,7 +1234,30 @@ void bd_unlink_disk_holder(struct block_device *bd= ev, struct gendisk *disk) mutex_unlock(&bdev->bd_mutex); } EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); -#endif +#else +static inline int bd_disk_holder_corrupted_range(struct block_device *bd= ev, + loff_t off, size_t len, void *data) +{ + return -EOPNOTSUPP; +} +#endif /* CONFIG_SYSFS */ + +int bd_corrupted_range(struct block_device *bdev, loff_t disk_off, + loff_t bdev_off, size_t len, void *data) +{ + struct super_block *sb =3D get_super(bdev); + int rc =3D -EOPNOTSUPP; + + if (!sb) { + rc =3D bd_disk_holder_corrupted_range(bdev, disk_off, len, data); + return rc; + } else if (sb->s_op->corrupted_range) + rc =3D sb->s_op->corrupted_range(sb, bdev, bdev_off, len, data); + drop_super(sb); + + return rc; +} +EXPORT_SYMBOL(bd_corrupted_range); =20 static void __blkdev_put(struct block_device *bdev, fmode_t mode, int fo= r_part); =20 diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 809aaa32d53c..751cbd559bba 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -314,6 +314,8 @@ void unregister_blkdev(unsigned int major, const char= *name); bool bdev_check_media_change(struct block_device *bdev); int __invalidate_device(struct block_device *bdev, bool kill_dirty); void set_capacity(struct gendisk *disk, sector_t size); +int bd_corrupted_range(struct block_device *bdev, loff_t disk_off, + loff_t bdev_off, size_t len, void *data); =20 /* for drivers/char/raw.c: */ int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long= ); --=20 2.30.0