linux-kernel - Re: [PATCH v8] sbitmap: fix io hung due to race on sbitmap

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Message-ID: <be0587f8-f4ea-4e37-b87e-569b26f10536@acm.org>
Date: Tue, 16 Jul 2024 14:01:22 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yang Yang <yang.yang@...o.com>, Jens Axboe <axboe@...nel.dk>,
 Andrew Morton <akpm@...ux-foundation.org>, Ming Lei <ming.lei@...hat.com>,
 Omar Sandoval <osandov@...com>, linux-kernel@...r.kernel.org,
 linux-block@...r.kernel.org
Subject: Re: [PATCH v8] sbitmap: fix io hung due to race on
 sbitmap_word::cleared

On 7/16/24 1:26 AM, Yang Yang wrote:
> This patch achieves two purposes:
> 1. Check on ->cleared and update on both ->cleared and ->word need to
> be done atomically, and using spinlock could be the simplest solution.
> 2. Add extra check in sbitmap_deferred_clear(), to identify whether
> ->word has free bits.

Reviewed-by: Bart Van Assche <bvanassche@....org>