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From: Ming Lei <ming.lei@redhat.com>
To: Eric Wheeler <linux-block@lists.ewheeler.net>
Cc: linux-block@vger.kernel.org
Subject: Re: loop: it looks like REQ_OP_FLUSH could return before IO completion.
Date: Mon, 21 Mar 2022 08:21:50 +0800	[thread overview]
Message-ID: <YjfFHvTCENCC29WS@T590> (raw)
In-Reply-To: <af3e552a-6c77-b295-19e1-d7a1e39b31f3@ewheeler.net>

On Sat, Mar 19, 2022 at 10:14:29AM -0700, Eric Wheeler wrote:
> Hello all,
> 
> In loop.c do_req_filebacked() for REQ_OP_FLUSH, lo_req_flush() is called: 
> it does not appear that lo_req_flush() does anything to make sure 
> ki_complete has been called for pending work, it just calls vfs_fsync().
> 
> Is this a consistency problem?

No. What FLUSH command provides is just flushing cache in device side to
storage medium, so it is nothing to do with pending request.


Thanks, 
Ming


  reply	other threads:[~2022-03-21  0:22 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-19 17:14 loop: it looks like REQ_OP_FLUSH could return before IO completion Eric Wheeler
2022-03-21  0:21 ` Ming Lei [this message]
2022-03-23  6:14   ` Eric Wheeler
2022-04-13 22:49     ` Eric Wheeler
2022-04-14  0:15       ` Ming Lei
2022-04-14  0:28       ` Ming Lei
2022-04-15  2:10         ` Eric Wheeler
2022-04-15 14:29           ` Ming Lei
2022-04-16  5:18             ` Christoph Hellwig
2022-04-16 20:05               ` Eric Wheeler
2022-04-17  0:59                 ` Jens Axboe
2022-04-17 16:32                   ` Eric Wheeler

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