linux-kernel - Re: [PATCH 1/4] vfs: Prepare for adding a new preadv/pwritev with user flags.

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Message-ID: <CANP1eJHqtpYttwmzhW2K7rN91fc_sxiLOGn56VrWyjEEc8HVtQ@mail.gmail.com>
Date:	Fri, 24 Oct 2014 12:59:09 -0400
From:	Milosz Tanski <milosz@...in.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-aio@...ck.org" <linux-aio@...ck.org>,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, "Theodore Ts'o" <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux API <linux-api@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 1/4] vfs: Prepare for adding a new preadv/pwritev with
 user flags.

On Fri, Oct 24, 2014 at 11:12 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
> Milosz Tanski <milosz@...in.com> writes:
>
>> Plumbing the flags argument through the vfs code so they can be passed down to
>> __generic_file_(read/write)_iter function that do the acctual work.
>                                                         ^^^^^^^
> actual
>
>> Signed-off-by: Milosz Tanski <milosz@...in.com>
>
>> diff --git a/fs/read_write.c b/fs/read_write.c
>> index 7d9318c..9858c06 100644
>> --- a/fs/read_write.c
>> +++ b/fs/read_write.c
> [...]
>> @@ -1113,6 +1116,7 @@ COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
>>       return __compat_sys_preadv64(fd, vec, vlen, pos);
>>  }
>>
>> +
>>  static size_t compat_writev(struct file *file,
>>                           const struct compat_iovec __user *vec,
>>                           unsigned long vlen, loff_t *pos)
>
> Lose this hunk.
>
>
>> diff --git a/mm/filemap.c b/mm/filemap.c
>> index 14b4642..cb7f530 100644
>> --- a/mm/filemap.c
>> +++ b/mm/filemap.c
>> @@ -1465,7 +1465,7 @@ static void shrink_readahead_size_eio(struct file *filp,
>>   * of the logic when it comes to error handling etc.
>>   */
>>  static ssize_t do_generic_file_read(struct file *filp, loff_t *ppos,
>> -             struct iov_iter *iter, ssize_t written)
>> +             struct iov_iter *iter, ssize_t written, int flags)
>>  {
>>       struct address_space *mapping = filp->f_mapping;
>>       struct inode *inode = mapping->host;
>
> As Christoph mentioned, this belongs elsewhere.
>
> Fix that up and you an add my:
>
> Reviewed-by: Jeff Moyer <jmoyer@...hat.com>

I have addresses both these issues and they'll be in the next submission.

-- 
Milosz Tanski
CTO
16 East 34th Street, 15th floor
New York, NY 10016

p: 646-253-9055
e: milosz@...in.com
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