linux-ext4 - Re: [RFC PATCH 18/22] ext3: add support for .read_iter and .write

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Message-ID: <4F4C0E46.9090000@oracle.com>
Date:	Mon, 27 Feb 2012 17:14:14 -0600
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	Zach Brown <zab@...bo.net>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC PATCH 18/22] ext3: add support for .read_iter and .write_iter

On 02/27/2012 04:34 PM, Zach Brown wrote:
> 
>>   drivers/block/loop.c |   55 ++++++++++++++++++-
>>   fs/ext3/file.c       |    2 +
>>   fs/ext3/inode.c      |  149
>> ++++++++++++++++++++++++++++++++++----------------
>>   include/linux/loop.h |    1 +
>>   4 files changed, 160 insertions(+), 47 deletions(-)
> 
> It looks like the patch that teaches loop to use the kernel aio
> interface got combined with the patch that adds the _bvec entry points
> to ext3.

Okay, looking back, your patchset had them separate. This was my error.
I'll separate them again.

>> +    if (file->f_op->write_iter&&  file->f_op->read_iter) {
>> +        file->f_flags |= O_DIRECT;
>> +        lo_flags |= LO_FLAGS_USE_AIO;
>> +    }
> 
> This manual setting of f_flags still looks very fishy to me.  I remember
> finding that pattern somewhere else but that's not very comforting :).
> 
> - z
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