From patchwork Fri Aug 11 10:08:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13350512 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 DAC86C001DB for ; Fri, 11 Aug 2023 10:10:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235588AbjHKKKu (ORCPT ); Fri, 11 Aug 2023 06:10:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235648AbjHKKK1 (ORCPT ); Fri, 11 Aug 2023 06:10:27 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B465E3593; Fri, 11 Aug 2023 03:09:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=A5NrYQQ+iDMl8ZujZTgThEgOwqRi6PntDgVI1EiuCVQ=; b=sfWTgv2BPWYvzMM/4il9y74Drn EHJp9clvtdEHtpYQjRzvEt9SAR3ejMLE116/CrVtxPVVX4j81JwwyU6hY7YK1TIBx3ebMSMOCSBb9 RUxA9sjtCVeiw1QTdIy4VqMdApdC4657OyxiNyenzMOxg6jc7L2IsBOr1xgS/En+7D6gemUIEVkCX gDtUxh+7FW6q9H1hdenUSP7mACWFvzfVQbX+yLJkxJyfV5nQqAKmbeBTLQJgxt+EnLnU2rCxE769S IU8r4+8REAtchqaTjbaKmjDZsJ/Q+pNqWE4qWSEA63JPeLQW2oIIAzeooxj2G++rfBkCGB9sw4Q4S YnAVAUOw==; Received: from [88.128.92.63] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1qUP4z-00A5rB-1r; Fri, 11 Aug 2023 10:09:14 +0000 From: Christoph Hellwig To: Al Viro , Christian Brauner Cc: Jens Axboe , Denis Efremov , Josef Bacik , Stefan Haberland , Jan Hoeppner , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , "Darrick J . Wong" , Chris Mason , David Sterba , linux-block@vger.kernel.org, nbd@other.debian.org, linux-s390@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 14/17] block: call into the file system for bdev_mark_dead Date: Fri, 11 Aug 2023 12:08:25 +0200 Message-Id: <20230811100828.1897174-15-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230811100828.1897174-1-hch@lst.de> References: <20230811100828.1897174-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Combine the newly merged bdev_mark_dead helper with the existing mark_dead holder operation so that all operations that invalidate a device that is dead or being removed now go through the holder ops. This allows file systems to explicitly shutdown either ASAP (for a surprise removal) or after writing back data (for an orderly removal), and do so not only for the main device. Signed-off-by: Christoph Hellwig --- block/bdev.c | 30 +++++++++------------------- block/genhd.c | 44 +++++++++++++++++++++++------------------- fs/super.c | 8 ++++++-- include/linux/blkdev.h | 2 +- 4 files changed, 40 insertions(+), 44 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index b9ca947bd5e405..658d5dd62cac0a 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -968,31 +968,19 @@ EXPORT_SYMBOL(lookup_bdev); * to %true the device or media is already gone, if not we are preparing for an * orderly removal. * - * This syncs out all dirty data and writes back inodes and then invalidates any - * cached data in the inodes on the file system, the inodes themselves and the - * block device mapping. + * This calls into the file system, which then typicall syncs out all dirty data + * and writes back inodes and then invalidates any cached data in the inodes on + * the file system. In addition we also invalidate the block device mapping. */ void bdev_mark_dead(struct block_device *bdev, bool surprise) { - struct super_block *sb = get_super(bdev); - int res = 0; + mutex_lock(&bdev->bd_holder_lock); + if (bdev->bd_holder_ops && bdev->bd_holder_ops->mark_dead) + bdev->bd_holder_ops->mark_dead(bdev, surprise); + else + sync_blockdev(bdev); + mutex_unlock(&bdev->bd_holder_lock); - if (sb) { - if (!surprise) - sync_filesystem(sb); - /* - * no need to lock the super, get_super holds the - * read mutex so the filesystem cannot go away - * under us (->put_super runs with the write lock - * hold). - */ - shrink_dcache_sb(sb); - res = invalidate_inodes(sb, true); - drop_super(sb); - } else { - if (!surprise) - sync_blockdev(bdev); - } invalidate_bdev(bdev); } #ifdef CONFIG_DASD diff --git a/block/genhd.c b/block/genhd.c index afc2cb09eb94b9..cc32a0c704eb84 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -554,7 +554,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, } EXPORT_SYMBOL(device_add_disk); -static void blk_report_disk_dead(struct gendisk *disk) +static void blk_report_disk_dead(struct gendisk *disk, bool surprise) { struct block_device *bdev; unsigned long idx; @@ -565,10 +565,7 @@ static void blk_report_disk_dead(struct gendisk *disk) continue; rcu_read_unlock(); - mutex_lock(&bdev->bd_holder_lock); - if (bdev->bd_holder_ops && bdev->bd_holder_ops->mark_dead) - bdev->bd_holder_ops->mark_dead(bdev); - mutex_unlock(&bdev->bd_holder_lock); + bdev_mark_dead(bdev, surprise); put_device(&bdev->bd_device); rcu_read_lock(); @@ -576,14 +573,7 @@ static void blk_report_disk_dead(struct gendisk *disk) rcu_read_unlock(); } -/** - * blk_mark_disk_dead - mark a disk as dead - * @disk: disk to mark as dead - * - * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O - * to this disk. - */ -void blk_mark_disk_dead(struct gendisk *disk) +static void __blk_mark_disk_dead(struct gendisk *disk) { /* * Fail any new I/O. @@ -603,8 +593,19 @@ void blk_mark_disk_dead(struct gendisk *disk) * Prevent new I/O from crossing bio_queue_enter(). */ blk_queue_start_drain(disk->queue); +} - blk_report_disk_dead(disk); +/** + * blk_mark_disk_dead - mark a disk as dead + * @disk: disk to mark as dead + * + * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O + * to this disk. + */ +void blk_mark_disk_dead(struct gendisk *disk) +{ + __blk_mark_disk_dead(disk); + blk_report_disk_dead(disk, true); } EXPORT_SYMBOL_GPL(blk_mark_disk_dead); @@ -641,17 +642,20 @@ void del_gendisk(struct gendisk *disk) disk_del_events(disk); /* - * Prevent new openers by unlinked the bdev inode, and write out - * dirty data before marking the disk dead and stopping all I/O. + * Prevent new openers by unlinked the bdev inode. */ mutex_lock(&disk->open_mutex); - xa_for_each(&disk->part_tbl, idx, part) { + xa_for_each(&disk->part_tbl, idx, part) remove_inode_hash(part->bd_inode); - bdev_mark_dead(part, false); - } mutex_unlock(&disk->open_mutex); - blk_mark_disk_dead(disk); + /* + * Tell the file system to write back all dirty data and shut down if + * it hasn't been notified earlier. + */ + if (!test_bit(GD_DEAD, &disk->state)) + blk_report_disk_dead(disk, false); + __blk_mark_disk_dead(disk); /* * Drop all partitions now that the disk is marked dead. diff --git a/fs/super.c b/fs/super.c index bbce0fdebf7e52..94d41040584f7b 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1228,7 +1228,7 @@ static bool lock_active_super(struct super_block *sb) return true; } -static void fs_mark_dead(struct block_device *bdev) +static void fs_bdev_mark_dead(struct block_device *bdev, bool surprise) { struct super_block *sb = bdev->bd_holder; @@ -1238,6 +1238,10 @@ static void fs_mark_dead(struct block_device *bdev) if (!lock_active_super(sb)) return; + if (!surprise) + sync_filesystem(sb); + shrink_dcache_sb(sb); + invalidate_inodes(sb, true); if (sb->s_op->shutdown) sb->s_op->shutdown(sb); @@ -1245,7 +1249,7 @@ static void fs_mark_dead(struct block_device *bdev) } const struct blk_holder_ops fs_holder_ops = { - .mark_dead = fs_mark_dead, + .mark_dead = fs_bdev_mark_dead, }; EXPORT_SYMBOL_GPL(fs_holder_ops); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6721595b9f9741..cdd03c612d3957 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1461,7 +1461,7 @@ void blkdev_show(struct seq_file *seqf, off_t offset); #endif struct blk_holder_ops { - void (*mark_dead)(struct block_device *bdev); + void (*mark_dead)(struct block_device *bdev, bool surprise); }; extern const struct blk_holder_ops fs_holder_ops;