From: Al Viro <viro@ZenIV.linux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: Avi Kivity <avi@scylladb.com>,
linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] aio: implement IOCB_CMD_POLL
Date: Thu, 2 Aug 2018 00:54:12 +0100 [thread overview]
Message-ID: <20180801235412.GT30522@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180730071544.23998-4-hch@lst.de>
On Mon, Jul 30, 2018 at 09:15:43AM +0200, Christoph Hellwig wrote:
> + apt.error = -EINVAL; /* same as no support for IOCB_CMD_POLL */
> + mask = vfs_poll(req->file, &apt.pt) & req->events;
> + if (mask || apt.error) {
> + bool removed = false;
> +
> + /* we did not manage to set up a waitqueue, done */
> + if (unlikely(!req->head))
> + goto out_fput;
> +out_fput:
> + fput(req->file);
> + return apt.error;
Ugh... So anything that simply returns a constant value, without
even bothering to do poll_wait() (on the theory that no matter how
much you wait, nothing will change) is going to git -EINVAL?
What am I missing here?
next prev parent reply other threads:[~2018-08-01 23:54 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-30 7:15 aio poll and a new in-kernel poll API V21 (aka 2.0) Christoph Hellwig
2018-07-30 7:15 ` [PATCH 1/4] timerfd: add support for keyed wakeups Christoph Hellwig
2018-07-30 7:15 ` [PATCH 2/4] aio: add a iocb refcount Christoph Hellwig
2018-08-01 23:19 ` Al Viro
2018-08-02 8:59 ` Christoph Hellwig
2018-07-30 7:15 ` [PATCH 3/4] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-08-01 23:54 ` Al Viro [this message]
2018-08-02 9:00 ` Christoph Hellwig
2018-08-02 0:21 ` Al Viro
2018-08-02 9:22 ` Christoph Hellwig
2018-08-02 16:00 ` Al Viro
2018-08-02 16:08 ` Christoph Hellwig
2018-08-02 16:08 ` Al Viro
2018-08-02 16:16 ` Christoph Hellwig
2018-08-02 21:48 ` Al Viro
2018-07-30 7:15 ` [PATCH 4/4] aio: allow direct aio poll comletions for keyed wakeups Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2018-08-06 8:30 aio poll V22 (aka 2.0) Christoph Hellwig
2018-08-06 8:30 ` [PATCH 3/4] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-07-26 8:28 aio poll and a new in-kernel poll API V20 (aka 2.0) Christoph Hellwig
2018-07-26 8:29 ` [PATCH 3/4] aio: implement IOCB_CMD_POLL Christoph Hellwig
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