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From: David Howells <dhowells@redhat.com>
To: Christian Brauner <christian@brauner.io>
Cc: dhowells@redhat.com, Al Viro <viro@zeniv.linux.org.uk>,
	torvalds@linux-foundation.org, Arnd Bergmann <arnd@arndb.de>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-api <linux-api@vger.kernel.org>
Subject: Re: [PATCH 0/4] uapi, vfs: Change the mount API UAPI [ver #2]
Date: Fri, 17 May 2019 08:13:26 +0100	[thread overview]
Message-ID: <11455.1558077206@warthog.procyon.org.uk> (raw)
In-Reply-To: <F67AF221-C576-4424-88D7-7C6074D0A6C6@brauner.io>

Christian Brauner <christian@brauner.io> wrote:

> If you still prefer to have cloexec flags
> for the 4 new syscalls then yes,
> if they could at least all have the same name
> (FSMOUNT_CLOEXEC?) that would be good.

They don't all have the same value (see OPEN_TREE_CLOEXEC).

Note that I also don't want to blindly #define them to O_CLOEXEC because it's
not necessarily the same value on all arches.  Currently it can be 02000000,
010000000 or 0x400000 for instance, which means that if it's sharing a mask
with other flags, at least three bits have to be reserved for it or we have to
have arch-dependent bit juggling.

One thing I like about your approach of just making them O_CLOEXEC by default
and removing the constants is that it avoids this mess entirely.

David

  parent reply	other threads:[~2019-05-17  7:13 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 11:52 David Howells
2019-05-16 11:52 ` [PATCH 1/4] uapi, fs: make all new mount api fds cloexec by default " David Howells
2019-05-16 11:52 ` [PATCH 2/4] uapi, fsopen: use square brackets around "fscontext" " David Howells
2019-05-16 11:52 ` [PATCH 3/4] uapi, x86: Fix the syscall numbering of the mount API syscalls " David Howells
2019-05-16 13:01   ` Christian Brauner
2019-05-16 11:52 ` [PATCH 4/4] uapi: Wire up the mount API syscalls on non-x86 arches " David Howells
2019-05-16 13:01   ` Christian Brauner
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:59     ` Christian Brauner
2019-05-16 16:22 ` [PATCH 0/4] uapi, vfs: Change the mount API UAPI " Al Viro
2019-05-16 16:31   ` Al Viro
2019-05-16 16:31   ` Christian Brauner
2019-05-16 16:50     ` Al Viro
2019-05-16 17:01       ` Christian Brauner
2019-05-16 20:23       ` Dmitry V. Levin
2019-05-17  6:54         ` Christian Brauner
2019-05-17  7:01       ` Christian Brauner
2019-05-17  7:13       ` David Howells [this message]
2019-05-17  7:25         ` Miklos Szeredi
2019-05-17  7:27         ` Christian Brauner
2019-05-16 18:57 Alexey Dobriyan

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