From: Christoph Hellwig <hch@infradead.org>
To: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Zach Brown <zab@zabbo.net>
Subject: Re: [RFC PATCH 00/22] loop: Issue O_DIRECT aio with pages
Date: Tue, 28 Feb 2012 04:29:26 -0500 [thread overview]
Message-ID: <20120228092926.GA2766@infradead.org> (raw)
In-Reply-To: <1330377576-3659-1-git-send-email-dave.kleikamp@oracle.com>
I had a very brief look over the series, and in general I like it.
But there is one thing that needs a major revision, and that is the
filesyste, interface.
For one you make ->aio_read/write trivial wrappers around ->read_iter
and ->write_iter. Instead of keeping this duplication around please
make sure to entirely kill ->aio_read/write and always use your new
methods. Without that we'll get into a complete mess like the old
->aio_read/write vs ->readv/writev again.
A similar thing applies to the ->direct_IO/direct_IO_bvec interface -
instead of duplicating it I'd rather change the ->direct_IO interface to:
ssize_t (*direct_IO)(int rw, struct kiocb *iocb,
struct iov_iter *iter, loff_t pos)
and let only fs/direct-io.c care about the difference when using user vs
kernel pages.
next prev parent reply other threads:[~2012-02-28 9:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-27 21:19 [RFC PATCH 00/22] loop: Issue O_DIRECT aio with pages Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 01/22] iov_iter: move into its own file Dave Kleikamp
2012-03-01 20:25 ` Jeff Moyer
2012-02-27 21:19 ` [RFC PATCH 02/22] iov_iter: add copy_to_user support Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 03/22] fuse: convert fuse to use iov_iter_copy_[to|from]_user Dave Kleikamp
[not found] ` <1330377576-3659-4-git-send-email-dave.kleikamp-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-02-28 9:09 ` Miklos Szeredi
2012-02-27 21:19 ` [RFC PATCH 04/22] iov_iter: hide iovec details behind ops function pointers Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 05/22] iov_iter: add bvec support Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 06/22] iov_iter: add a shorten call Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 07/22] iov_iter: let callers extract iovecs and bio_vecs Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 08/22] dio: create a dio_aligned() helper function Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 09/22] dio: add dio_alloc_init() " Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 10/22] dio: add sdio_init() " Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 11/22] dio: add dio_lock_and_flush() helper Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 12/22] dio: add dio_post_submission() helper function Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 13/22] dio: add __blockdev_direct_IO_bdev() Dave Kleikamp
2012-02-27 22:16 ` Zach Brown
2012-02-27 21:19 ` [RFC PATCH 14/22] fs: pull iov_iter use higher up the stack Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 15/22] aio: add aio_kernel_() interface Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 16/22] aio: add aio support for iov_iter arguments Dave Kleikamp
2012-02-27 22:13 ` Zach Brown
2012-02-27 21:19 ` [RFC PATCH 17/22] bio: add bvec_length(), like iov_length() Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 18/22] ext3: add support for .read_iter and .write_iter Dave Kleikamp
2012-02-27 22:34 ` Zach Brown
2012-02-27 23:14 ` Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 19/22] ocfs2: add support for read_iter, write_iter, and direct_IO_bvec Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 20/22] ext4: " Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 21/22] btrfs: " Dave Kleikamp
2012-02-27 21:19 ` [RFC PATCH 22/22] nfs: add support for read_iter, write_iter Dave Kleikamp
[not found] ` <1330377576-3659-23-git-send-email-dave.kleikamp-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-02-27 22:08 ` Myklebust, Trond
2012-02-27 23:17 ` Dave Kleikamp
2012-02-27 22:27 ` [RFC PATCH 00/22] loop: Issue O_DIRECT aio with pages Zach Brown
2012-02-27 22:53 ` Dave Kleikamp
2012-02-28 9:29 ` Christoph Hellwig [this message]
2012-02-28 15:14 ` Zach Brown
2012-02-29 9:08 ` Christoph Hellwig
2012-03-01 20:33 ` Jeff Moyer
2012-03-01 20:36 ` Dave Kleikamp
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