linux-kernel - Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish

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Message-ID: <CA+55aFzsgbAUAFBydnob2zidYT6TW3YAfo2K22duftU+MjCMwQ@mail.gmail.com>
Date:	Fri, 11 Sep 2015 17:52:27 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Chris Mason <clm@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josef Bacik <jbacik@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()

On Fri, Sep 11, 2015 at 4:36 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Are we really ok with waiting synchronously for an inode while holding
> the plug? No chance of deadlock (waiting for IO that we've plugged)?
> That issue is true even of the current code, though, and I have _not_
> really thought that through, it's just a worry.

Never mind. We still flush the plug on explicit scheduling events.  I
wonder why I thought we got rid of that. Some kind of "senior moment",
I guess.

            Linus
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