linux-kernel - Re: [PATCH v5] blktrace: Fix potentail deadlock between delete & sysfs ops

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Date:   Mon, 18 Sep 2017 16:36:23 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "mingo@...nel.org" <mingo@...nel.org>,
        "longman@...hat.com" <longman@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: [PATCH v5] blktrace: Fix potentail deadlock between delete &
 sysfs ops

On Sat, 2017-09-16 at 19:37 -0700, Waiman Long wrote:
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 339e737..330b572 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -448,7 +448,7 @@ struct block_device {
>  
>  	/* The counter of freeze processes */
>  	int			bd_fsfreeze_count;
> -	/* Mutex for freeze */
> +	/* Mutex for freeze and blktrace */
>  	struct mutex		bd_fsfreeze_mutex;
>  } __randomize_layout;

This patch changes the meaning of bd_fsfreeze_mutex significantly. Please rename
that mutex such that its name matches its new role.

Thanks,

Bart.