linux-kernel - Re: [PATCH 2/3] io_uring: add interface for getting files

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Message-ID: <fc01874b-c01e-7d4b-2c1c-55973f2c1390@gmail.com>
Date:   Wed, 22 Jan 2020 05:24:32 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 2/3] io_uring: add interface for getting files

On 22/01/2020 04:54, Jens Axboe wrote:
> On 1/21/20 5:05 PM, Pavel Begunkov wrote:
>> Preparation without functional changes. Adds io_get_file(), that allows
>> to grab files not only into req->file.
>>
>> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
>> ---
>>  fs/io_uring.c | 66 ++++++++++++++++++++++++++++++++-------------------
>>  1 file changed, 41 insertions(+), 25 deletions(-)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index 8f7846cb1ebf..e9e4aee0fb99 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -1161,6 +1161,15 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
>>  	return NULL;
>>  }
>>  
>> +static inline void io_put_file(struct io_ring_ctx *ctx, struct file *file,
>> +			  bool fixed)
>> +{
>> +	if (fixed)
>> +		percpu_ref_put(&ctx->file_data->refs);
>> +	else
>> +		fput(file);
>> +}
> 
> Just make this take struct io_kiocb?
> 

Ok, I'll make it io_put_file(req, file, is_fixed);
It still needs @file, as there can be many per req as in splice.

> Apart from that, looks fine to me.
> 

-- 
Pavel Begunkov



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