linux-kernel - Re: [PATCH v6 03/24] erofs: add super block operations

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Message-ID: <20190831064853.GA162401@architecture4>
Date:   Sat, 31 Aug 2019 14:48:53 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Amir Goldstein <amir73il@...il.com>
CC:     Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Theodore Ts'o <tytso@....edu>, Pavel Machek <pavel@...x.de>,
        David Sterba <dsterba@...e.cz>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Jan Kara <jack@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        <devel@...verdev.osuosl.org>, LKML <linux-kernel@...r.kernel.org>,
        <linux-erofs@...ts.ozlabs.org>, Chao Yu <yuchao0@...wei.com>,
        Miao Xie <miaoxie@...wei.com>,
        Li Guifu <bluce.liguifu@...wei.com>,
        Fang Wei <fangwei1@...wei.com>
Subject: Re: [PATCH v6 03/24] erofs: add super block operations

On Sat, Aug 31, 2019 at 09:34:44AM +0300, Amir Goldstein wrote:
> On Fri, Aug 30, 2019 at 8:16 PM Gao Xiang <gaoxiang25@...wei.com> wrote:
> >
> > Hi Christoph,
> >
> > On Fri, Aug 30, 2019 at 09:39:10AM -0700, Christoph Hellwig wrote:
> > > On Thu, Aug 29, 2019 at 06:50:48PM +0800, Gao Xiang wrote:
> > > > > Please use an erofs_ prefix for all your functions.
> > > >
> > > > It is already a static function, I have no idea what is wrong here.
> > >
> > > Which part of all wasn't clear?  Have you looked at the prefixes for
> > > most functions in the various other big filesystems?
> >
> > I will add erofs prefix to free_inode as you said.
> >
> > At least, all non-prefix functions in erofs are all static functions,
> > it won't pollute namespace... I will add "erofs_" to other meaningful
> > callbacks...And as you can see...
> >
> > cifs/cifsfs.c
> > 1303:cifs_init_inodecache(void)
> > 1509:   rc = cifs_init_inodecache();
> >
> > hpfs/super.c
> > 254:static int init_inodecache(void)
> > 771:    int err = init_inodecache();
> >
> > minix/inode.c
> > 84:static int __init init_inodecache(void)
> > 665:    int err = init_inodecache();
> >
> 
> Hi Gao,
> 
> "They did it first" is never a good reply for code review comments.
> Nobody cares if you copy&paste code with init_inodecache().
> I understand why you thought static function names do not pollute
> the (linker) namespace, but they do pollute the global namespace.
> 
> free_inode() as a local function name is one of the worst examples
> for VFS namespace pollution.
> 
> VFS code uses function names like those a lot in the global namespace, e.g.:
> clear_inode(),new_inode().
> 
> For example from recent history of namespace collision caused by your line
> of thinking, see:
> e6fd2093a85d md: namespace private helper names
> 
> Besides, you really have nothing to loose from prefixing everything
> with erofs_, do you? It's better for review, for debugging...

Hi Amir,

Thanks for you kind reply...

Yes, I understand that some generic header files
could have the same function names and cause bad
behaviors...

I will fix them, my only one question is "if all
function/variable names are prefixed with "erofs_"
(including all inline helpers in header files),
it seems somewhat strange... (too many statements
start "erofs_" in the source code...)"

I will fix common and short names at once...

Thanks,
Gao Xiang

> 
> Thanks,
> Amir.