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Date:   Tue, 17 Dec 2019 03:42:52 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Miklos Szeredi <mszeredi@redhat.com>
Cc:     linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 11/12] vfs: don't parse "posixacl" option
Message-ID: <20191217034252.GT4203@ZenIV.linux.org.uk>
References: <20191128155940.17530-1-mszeredi@redhat.com>
 <20191128155940.17530-12-mszeredi@redhat.com>
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On Thu, Nov 28, 2019 at 04:59:39PM +0100, Miklos Szeredi wrote:
> Unlike the others, this is _not_ a standard option accepted by mount(8).
> 
> In fact SB_POSIXACL is an internal flag, and accepting MS_POSIXACL on the
> mount(2) interface is possibly a bug.
> 
> The only filesystem that apparently wants to handle the "posixacl" option
> is 9p, but it has special handling of that option besides setting
> SB_POSIXACL.

Huh?  For e.g. ceph having -o posixacl and -o acl are currently equivalent;
your patch would seem to break that, wouldn't it?