From: Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
To: Karel Zak <kzak-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Miklos Szeredi <mszeredi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Eric W. Biederman"
<ebiederm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-fsdevel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
util-linux-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Michael Kerrisk (man-pages)"
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: User-visible context-mount API
Date: Fri, 19 Jan 2018 02:27:18 +0000 [thread overview]
Message-ID: <20180119022717.GF13338@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180117110633.zneqvnjzgxkv4yc2-xkT7n84Rsxv/9pzu0YdTqQ@public.gmane.org>
On Wed, Jan 17, 2018 at 12:06:33PM +0100, Karel Zak wrote:
> What about new flag (for the API) rather than try to be smart with the
> current flags? But I have doubts that invest time to new mount(2)
> features is a good idea.
Would be nice, if we had any spare bits left... We could, in principle,
turn
#define MS_BIND 4096
#define MS_MOVE 8192
into
#define MS_BIND 0x1000
#define MS_MOVE 0x2000
#define MS_SOMETHING 0x3000
seeing that they should never be used together, but... mount(2)
doesn't reject MS_BIND|MS_MOVE and treats it as MS_BIND instead.
_Probably_ nothing would care, but it risks breaking userland.
We could use one of the internal-only bits for that instead, but
they are also quietly ignored and not rejected, so that would
have the same problem.
mount(2) ABI sucks, film at 11...
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next prev parent reply other threads:[~2018-01-19 2:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <28167.1516032442@warthog.procyon.org.uk>
[not found] ` <28167.1516032442-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2018-01-16 9:01 ` User-visible context-mount API Miklos Szeredi
2018-01-16 10:10 ` David Howells
2018-01-16 10:35 ` Miklos Szeredi
[not found] ` <CAOssrKc46bf=yme=zSubYF6t-TGfxEpCaKMQ6GVp30-vuaXWLw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-16 14:18 ` David Howells
[not found] ` <22576.1516097412-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2018-01-17 10:43 ` Karel Zak
[not found] ` <CAOssrKdgudK7kKbhQBAnV9EwzHBq=4+9M26JGfmhNDGrGXmnFg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-16 15:40 ` David Howells
[not found] ` <1643.1516117204-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2018-01-16 16:41 ` Miklos Szeredi
[not found] ` <CAOssrKdn-ZhOB9V28uL-JK9zgNGJzF4cFBeyoqLLj4pADqNFVQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-17 4:17 ` Al Viro
2018-01-17 9:53 ` Miklos Szeredi
[not found] ` <CAOssrKfN_ZT5yJC1mxkhUf6FG=_eMD4nzQtETfu_4X3vOf1kHw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-17 11:06 ` Karel Zak
[not found] ` <20180117110633.zneqvnjzgxkv4yc2-xkT7n84Rsxv/9pzu0YdTqQ@public.gmane.org>
2018-01-18 9:48 ` Miklos Szeredi
2018-01-19 2:27 ` Al Viro [this message]
2018-01-19 6:32 ` Al Viro
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