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

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Message-ID: <x49a94lpkma.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 24 Oct 2014 11:12:29 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Milosz Tanski <milosz@...in.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.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@...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.

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>
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