linux-kernel - Re: [PATCH 5/6] fsmount: do not use legacy MS

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Message-ID: <20180922161406.6beo2ob6ki2otrjx@brauner.io>
Date:   Sat, 22 Sep 2018 18:14:07 +0200
From:   Christian Brauner <christian@...uner.io>
To:     David Howells <dhowells@...hat.com>
Cc:     Miklos Szeredi <mszeredi@...hat.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] fsmount: do not use legacy MS_ flags

On Sat, Sep 22, 2018 at 04:48:32PM +0100, David Howells wrote:
> Christian Brauner <christian@...uner.io> wrote:
> 
> > mount_setattr(int dfd, const char *path, unsigned int atflags,
> >               unsigned int attr_cmd,
> > 	      unsigned int attr_values,
> > 	      unsigned int attr_mask);
> 
> Whilst you can have up to six arguments on a syscall, I seem to remember that
> 6-arg syscalls require special handlers on some systems due to register count.

Sure, but if we wanted to we might just get the syscall down to five
arguments even with my suggestion. Of course, I'm not sure what the
reasons for all of the other arguments to this function are since it's
not yet implemented. Seems that attr_values and attr_mask could be
compacted to a single attr_mask maybe? :)

Christian

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