linux-kernel - [PATCH v5 0/2] cancel all throttled bios in del

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Message-ID: <20211210083143.3181535-1-yukuai3@huawei.com>
Date:   Fri, 10 Dec 2021 16:31:41 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <tj@...nel.org>, <mkoutny@...e.com>, <hch@...radead.org>,
        <axboe@...nel.dk>
CC:     <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH v5 0/2] cancel all throttled bios in del_gendisk()

If del_gendisk() is done when some io are still throttled, such io
will not be handled until the throttle is done, which is not
necessary.

Changes in v2:
 - move WARN_ON_ONCE() from throtl_rb_first() to it's caller
 - merge some patches into one.

Changes in v3:
 - some code optimization in patch 1
 - hold queue lock to cancel bios in patch 2

Changes in v4:
 - delete rcu_read_lock() and rcu_read_unlock() in patch 2

Changes in v5:
 - add comment about rcu lock

Yu Kuai (2):
  blk-throtl: move WARN_ON_ONCE() from throtl_rb_first() to it's caller
  block: cancel all throttled bios in del_gendisk()

 block/blk-throttle.c | 75 ++++++++++++++++++++++++++++++++++++++++++--
 block/blk-throttle.h |  2 ++
 block/genhd.c        |  2 ++
 3 files changed, 76 insertions(+), 3 deletions(-)

-- 
2.31.1