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Date:   Fri, 1 May 2020 11:54:35 -0600
From:   Jens Axboe <>
To:     Alexander Viro <>
Cc:     linux-fsdevel <>,
        "" <>
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

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