linux-ext4 - [PATCH v3 0/5] quota: fix race condition between dqput() and dquot_mark_dquot

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Message-ID: <20230630110822.3881712-1-libaokun1@huawei.com>
Date:   Fri, 30 Jun 2023 19:08:17 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <jack@...e.cz>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-ext4@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>,
        <yangerkun@...wei.com>, <chengzhihao1@...wei.com>,
        <yukuai3@...wei.com>, <libaokun1@...wei.com>
Subject: [PATCH v3 0/5] quota: fix race condition between dqput() and dquot_mark_dquot_dirty()

Hello Honza,

This is a solution that uses dquot_srcu to avoid race condition between
dqput() and dquot_mark_dquot_dirty(). I performed a 12+h fault injection
stress test (6 VMs, 4 test threads per VM) and have not found any problems.
And I tested the performance based on the next branch (5c875096d590), this
patch set didn't degrade performance, but rather had a ~5% improvement.

V1->V2:
	Modify the solution to use dquot_srcu.
V2->V3:
	Merge some patches, optimize descriptions.
	Simplify solutions, and fix some spelling errors.

Baokun Li (5):
  quota: factor out dquot_write_dquot()
  quota: rename dquot_active() to inode_quota_active()
  quota: add new helper dquot_active()
  quota: fix dqput() to follow the guarantees dquot_srcu should provide
  quota: simplify drop_dquot_ref()

 fs/quota/dquot.c | 244 ++++++++++++++++++++++++-----------------------
 1 file changed, 125 insertions(+), 119 deletions(-)

-- 
2.31.1