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,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 73C16C433EF for ; Wed, 22 Sep 2021 17:30:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5488361131 for ; Wed, 22 Sep 2021 17:30:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236887AbhIVRcK (ORCPT ); Wed, 22 Sep 2021 13:32:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236885AbhIVRcK (ORCPT ); Wed, 22 Sep 2021 13:32:10 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8B12C061574 for ; Wed, 22 Sep 2021 10:30:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=tz/9KTOWfqLi9sB2mX/YZC4W2K0PnBLeoEcjR7rW+oM=; b=pAGthflX5CXRAsFp5fzyybQ+zJ 8S0v+ye6WxbBjhY+voUyApZHZ70j0QxRFxnmYCOJYBdOd+GiBiVcfXjV3c7lu8wHM4v8M1RyS0sr3 O+xnI8qpkghfgtDcPU68NzdZsYpW2tMu+TaxX6GT6Nj5j1vAUM8vmc02lhSIkzZuAHmh8S7i/7+/b +TD6cek2bVJipHkdu7TAOGAyG7AtiJm5AsRb5rcvWJaRncrtnlO1wIr8zsEifqzu0FiAs4IyOVwnQ d1z03BEcmscx2VbNH4C6BR/hXuOFAOU4vudwAVjXCoZP4YPXbczjYy68Z3M/IyBPRNVyRUavuxnx9 B7WAQO2A==; Received: from [2001:4bb8:184:72db:3a8e:1992:6715:6960] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT624-004zI0-U8; Wed, 22 Sep 2021 17:28:15 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , linux-block@vger.kernel.org, Ming Lei Subject: [PATCH 3/4] block: drain file system I/O on del_gendisk Date: Wed, 22 Sep 2021 19:22:21 +0200 Message-Id: <20210922172222.2453343-4-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210922172222.2453343-1-hch@lst.de> References: <20210922172222.2453343-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Instead of delaying draining of file system I/O related items like the blk-qos queues, the integrity read workqueue and timeouts only when the request_queue is removed, do that when del_gendisk is called. This is important for SCSI where the upper level drivers that control the gendisk are separate entities, and the disk can be freed much earlier than the request_queue, or can even be unbound without tearing down the queue. Fixes: edb0872f44ec ("block: move the bdi from the request_queue to the gendisk") Reported-by: Ming Lei Signed-off-by: Christoph Hellwig --- block/blk-core.c | 27 ++++++++++++--------------- block/blk.h | 1 + block/genhd.c | 21 +++++++++++++++++++++ include/linux/genhd.h | 1 + 4 files changed, 35 insertions(+), 15 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index e951378855a02..d150d829a53c4 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -49,7 +49,6 @@ #include "blk-mq.h" #include "blk-mq-sched.h" #include "blk-pm.h" -#include "blk-rq-qos.h" struct dentry *blk_debugfs_root; @@ -337,23 +336,25 @@ void blk_put_queue(struct request_queue *q) } EXPORT_SYMBOL(blk_put_queue); -void blk_set_queue_dying(struct request_queue *q) +void blk_queue_start_drain(struct request_queue *q) { - blk_queue_flag_set(QUEUE_FLAG_DYING, q); - /* * When queue DYING flag is set, we need to block new req * entering queue, so we call blk_freeze_queue_start() to * prevent I/O from crossing blk_queue_enter(). */ blk_freeze_queue_start(q); - if (queue_is_mq(q)) blk_mq_wake_waiters(q); - /* Make blk_queue_enter() reexamine the DYING flag. */ wake_up_all(&q->mq_freeze_wq); } + +void blk_set_queue_dying(struct request_queue *q) +{ + blk_queue_flag_set(QUEUE_FLAG_DYING, q); + blk_queue_start_drain(q); +} EXPORT_SYMBOL_GPL(blk_set_queue_dying); /** @@ -385,13 +386,8 @@ void blk_cleanup_queue(struct request_queue *q) */ blk_freeze_queue(q); - rq_qos_exit(q); - blk_queue_flag_set(QUEUE_FLAG_DEAD, q); - /* for synchronous bio-based driver finish in-flight integrity i/o */ - blk_flush_integrity(); - blk_sync_queue(q); if (queue_is_mq(q)) blk_mq_exit_queue(q); @@ -474,11 +470,12 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) static inline int bio_queue_enter(struct bio *bio) { - struct request_queue *q = bio->bi_bdev->bd_disk->queue; + struct gendisk *disk = bio->bi_bdev->bd_disk; + struct request_queue *q = disk->queue; while (!blk_try_enter_queue(q, false)) { if (bio->bi_opf & REQ_NOWAIT) { - if (blk_queue_dying(q)) + if (test_bit(GD_DEAD, &disk->state)) goto dead; bio_wouldblock_error(bio); return -EBUSY; @@ -495,8 +492,8 @@ static inline int bio_queue_enter(struct bio *bio) wait_event(q->mq_freeze_wq, (!q->mq_freeze_depth && blk_pm_resume_queue(false, q)) || - blk_queue_dying(q)); - if (blk_queue_dying(q)) + test_bit(GD_DEAD, &disk->state)); + if (test_bit(GD_DEAD, &disk->state)) goto dead; } diff --git a/block/blk.h b/block/blk.h index 7d2a0ba7ed21d..e2ed2257709ae 100644 --- a/block/blk.h +++ b/block/blk.h @@ -51,6 +51,7 @@ struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size, void blk_free_flush_queue(struct blk_flush_queue *q); void blk_freeze_queue(struct request_queue *q); +void blk_queue_start_drain(struct request_queue *q); #define BIO_INLINE_VECS 4 struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs, diff --git a/block/genhd.c b/block/genhd.c index 7b6e5e1cf9564..b3c33495d7208 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -26,6 +26,7 @@ #include #include "blk.h" +#include "blk-rq-qos.h" static struct kobject *block_depr; @@ -559,6 +560,8 @@ EXPORT_SYMBOL(device_add_disk); */ void del_gendisk(struct gendisk *disk) { + struct request_queue *q = disk->queue; + might_sleep(); if (WARN_ON_ONCE(!disk_live(disk) && !(disk->flags & GENHD_FL_HIDDEN))) @@ -575,8 +578,26 @@ void del_gendisk(struct gendisk *disk) fsync_bdev(disk->part0); __invalidate_device(disk->part0, true); + /* + * Fail any new I/O. + */ + set_bit(GD_DEAD, &disk->state); set_capacity(disk, 0); + /* + * Prevent new I/O from crossing bio_queue_enter(). + */ + blk_queue_start_drain(q); + blk_mq_freeze_queue_wait(q); + + rq_qos_exit(q); + blk_sync_queue(q); + blk_flush_integrity(); + /* + * Allow using passthrough request again after the queue is torn down. + */ + blk_mq_unfreeze_queue(q); + if (!(disk->flags & GENHD_FL_HIDDEN)) { sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index c68d83c87f83f..0f5315c2b5a34 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -149,6 +149,7 @@ struct gendisk { unsigned long state; #define GD_NEED_PART_SCAN 0 #define GD_READ_ONLY 1 +#define GD_DEAD 2 struct mutex open_mutex; /* open/close mutex */ unsigned open_partitions; /* number of open partitions */ -- 2.30.2