linux-kernel - Re: [PATCH v4 27/31] gfs2: Convert aio_read/write ops to read/write

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Date:	Mon, 03 Dec 2012 13:14:45 -0600
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	Dave Chinner <david@...morbit.com>
CC:	Steven Whitehouse <swhiteho@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Zach Brown <zab@...bo.net>,
	"Maxim V. Patlasov" <mpatlasov@...allels.com>,
	cluster-devel@...hat.com
Subject: Re: [PATCH v4 27/31] gfs2: Convert aio_read/write ops to read/write_iter

On 11/23/2012 11:59 AM, Dave Kleikamp wrote:
> On 11/22/2012 04:59 PM, Dave Chinner wrote:
>> On Thu, Nov 22, 2012 at 09:51:33AM +0000, Steven Whitehouse wrote:
>>> Hi,
>>>
>>> On Wed, 2012-11-21 at 16:41 -0600, Dave Kleikamp wrote:
>>>> Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
>>>> Cc: Steven Whitehouse <swhiteho@...hat.com>
>>>> Cc: cluster-devel@...hat.com
>>>> ---
>>>>  fs/gfs2/file.c | 21 ++++++++++-----------
>>>>  1 file changed, 10 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
>>>> index e056b4c..bcea69e 100644
>>>> --- a/fs/gfs2/file.c
>>>> +++ b/fs/gfs2/file.c
>>>> @@ -655,10 +655,9 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
>>>>  }
>>>>  
>>>>  /**
>>>> - * gfs2_file_aio_write - Perform a write to a file
>>>> + * gfs2_file_write_iter - Perform a write to a file
>>>>   * @iocb: The io context
>>>> - * @iov: The data to write
>>>> - * @nr_segs: Number of @iov segments
>>>> + * @iter: The data to write
>>>>   * @pos: The file position
>>>>   *
>>>>   * We have to do a lock/unlock here to refresh the inode size for
>>>> @@ -668,11 +667,11 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
>>>>   *
>>>>   */
>>>>  
>>>> -static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
>>>> -				   unsigned long nr_segs, loff_t pos)
>>>> +static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *iter,
>>>> +				    loff_t pos)
>>>>  {
>>>>  	struct file *file = iocb->ki_filp;
>>>> -	size_t writesize = iov_length(iov, nr_segs);
>>>> +	size_t writesize = iov_iter_count(iter);
>>> Hmm, I'm not sure that length isn't a better name than count for this
>>> function. What we want is the total length of the i/o request and count
>>> sounds to me as if it would refer to the number of segments. So could we
>>> have a iov_iter_length() function instead perhaps?
>>
>> I had exactly the same thought when looking at one of the XFS
>> patches and was holding off commenting until I'd read the entire
>> patch set. But, you've pointed out the same thing, so I figured I'd
>> add my 2c here as well.
> 
> I agree with both of you. iov_iter_length() would be more consistent.

It seems iov_iter_count() has been defined since 2.6.24. I really don't
feel comfortable changing it now.

Shaggy
> 
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