linux-kernel - Re: [PATCH 1/6] sysfs: Basic support for multiple super blocks

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Message-ID: <20100331134757.GA6132@us.ibm.com>
Date:	Wed, 31 Mar 2010 08:47:57 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Tejun Heo <tj@...nel.org>, Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...et.ca>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/6] sysfs: Basic support for multiple super blocks

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Tejun Heo <tj@...nel.org> writes:
> >> index 30f5a44..030a39d 100644
> >> --- a/fs/sysfs/sysfs.h
> >> +++ b/fs/sysfs/sysfs.h
> >> @@ -114,6 +114,9 @@ struct sysfs_addrm_cxt {
> >>  /*
> >>   * mount.c
> >>   */
> >> +struct sysfs_super_info {
> >> +};
> >> +#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
> >
> > Another nit picking.  It would be better to wrap SB in the macro
> > definition.  Also, wouldn't an inline function be better?
> 
> Good spotting.  That doesn't bite today but it will certainly bite
> someday if it isn't fixed.
> 
> I wonder how that has slipped through the review all of this time.

(let me demonstrate how: )

WTH are you talking about?  Unless you mean doing (SB) inside
the definition?

I actually was going to suggest dropping the #define as it obscures
the code, but I figured it would get more complicated later.

-serge
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