linux-kernel - Re: [PATCH v3] eventfd: convert to f_op->read

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Message-ID: <222126cc-0eb5-31b1-2a31-ef1ff2b24f72@kernel.dk>
Date:   Fri, 1 May 2020 11:54:35 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] eventfd: convert to f_op->read_iter()

On 5/1/20 11:53 AM, Jens Axboe wrote:
> eventfd is using ->read() as it's file_operations read handler, but
> this prevents passing in information about whether a given IO operation
> is blocking or not. We can only use the file flags for that. To support
> async (-EAGAIN/poll based) retries for io_uring, we need ->read_iter()
> support. Convert eventfd to using ->read_iter().

Attached the wrong patch, forgot to update it... See 3b posting. I ran
this through my io_uring related eventfd testing, and it looks good.

-- 
Jens Axboe