linux-kernel - Re: [PATCH] loop: clear read-only flag in loop_clr

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Date:	Sun, 13 Feb 2011 15:11:10 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Tao Ma <tm@....ma>
CC:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] loop: clear read-only flag in loop_clr_fd.

On 02/13/2011 11:58 AM, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> In 75f1dc0, we check bdev_read_only() from blkdev_get().
> But the loop_clr_fd doesn't clear the read only flag.
> What cause a error if we changing a loop device from
> read only to writable.

No, sorry, this is not proper/complete fix. It fixes it for loop
(and even not completely - you are missing some error
paths and ignoring autoclear mode where you have bdev NULL.)
(And yes, I tried the same as workaround.)

And it will not help for DM case (and possibly others).

Milan
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