From: Al Viro <viro@zeniv.linux.org.uk>
To: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, Jan Kara <jack@suse.com>,
Jeff Layton <jlayton@kernel.org>,
Josef Bacik <josef@toxicpanda.com>, Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH RFC 18/20] fs: add f_pipe
Date: Wed, 4 Sep 2024 15:21:40 +0100 [thread overview]
Message-ID: <20240904142140.GH1049718@ZenIV> (raw)
In-Reply-To: <20240830-vfs-file-f_version-v1-18-6d3e4816aa7b@kernel.org>
On Fri, Aug 30, 2024 at 03:04:59PM +0200, Christian Brauner wrote:
> Only regular files with FMODE_ATOMIC_POS and directories need
> f_pos_lock. Place a new f_pipe member in a union with f_pos_lock
> that they can use and make them stop abusing f_version in follow-up
> patches.
Not sure I like that - having lseek(2) use a separate primitive
instead of fdget_pos(), grabbing ->f_pos_lock for _everything_ that
has FMODE_LSEEK, directory or no directory, would simplify quite
a few things. OTOH, that will affect only the explanation of validity -
pipes do *not* have FMODE_LSEEK, so it becomes "fdget_pos() and
fdget_seek() are the only things that might want ->f_pos_lock, and
neither touch it for pipes - fdget_pos() because FMODE_ATOMIC_POS
is not there and fdget_seek() because FMODE_LSEEK isn't".
Oh, well...
next prev parent reply other threads:[~2024-09-04 14:21 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-30 13:04 [PATCH RFC 00/20] file: remove f_version Christian Brauner
2024-08-30 13:04 ` [PATCH RFC 01/20] file: remove pointless comment Christian Brauner
2024-09-03 10:28 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 02/20] adi: remove unused f_version Christian Brauner
2024-09-03 10:30 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 03/20] ceph: " Christian Brauner
2024-09-03 10:30 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 04/20] s390: " Christian Brauner
2024-09-03 10:31 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 05/20] fs: add vfs_setpos_cookie() Christian Brauner
2024-09-03 11:35 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 06/20] fs: add must_set_pos() Christian Brauner
2024-09-03 11:32 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 07/20] fs: use must_set_pos() Christian Brauner
2024-09-03 11:30 ` Jan Kara
2024-09-03 11:41 ` Christian Brauner
2024-08-30 13:04 ` [PATCH RFC 08/20] fs: add generic_llseek_cookie() Christian Brauner
2024-09-03 11:34 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 09/20] affs: store cookie in private data Christian Brauner
2024-09-03 13:26 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 10/20] ext2: " Christian Brauner
2024-09-03 11:42 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 11/20] ext4: " Christian Brauner
2024-09-01 19:36 ` Theodore Ts'o
2024-09-03 11:37 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 12/20] input: remove f_version abuse Christian Brauner
2024-09-03 11:40 ` Jan Kara
2024-09-12 2:52 ` Lai, Yi
2024-09-12 10:02 ` Christian Brauner
2024-08-30 13:04 ` [PATCH RFC 13/20] ocfs2: store cookie in private data Christian Brauner
2024-09-03 13:27 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 14/20] proc: " Christian Brauner
2024-09-03 11:34 ` Christian Brauner
2024-09-03 13:35 ` Jan Kara
2024-09-03 14:00 ` Christian Brauner
2024-09-04 14:16 ` Jan Kara
2024-09-05 9:28 ` Christian Brauner
2024-09-03 13:33 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 15/20] udf: " Christian Brauner
2024-09-03 13:37 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 16/20] ufs: " Christian Brauner
2024-09-03 13:38 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 17/20] ubifs: " Christian Brauner
2024-09-03 13:39 ` Jan Kara
2024-08-30 13:04 ` [PATCH RFC 18/20] fs: add f_pipe Christian Brauner
2024-09-03 13:50 ` Jan Kara
2024-09-03 14:31 ` Christian Brauner
2024-09-04 14:08 ` Jan Kara
2024-09-04 14:21 ` Al Viro [this message]
2024-08-30 13:05 ` [PATCH RFC 19/20] pipe: use f_pipe Christian Brauner
2024-09-03 13:45 ` Jan Kara
2024-08-30 13:05 ` [PATCH RFC 20/20] fs: remove f_version Christian Brauner
2024-09-03 13:45 ` Jan Kara
2024-08-30 14:04 ` [PATCH RFC 00/20] file: " Jeff Layton
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