linux-kernel - Re: [PATCH v8 11/24] erofs: introduce xattr & posixacl support

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Message-ID: <20190902152139.GB179615@architecture4>
Date:   Mon, 2 Sep 2019 23:21:39 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     <dsterba@...e.cz>, Chao Yu <chao@...nel.org>,
        <linux-fsdevel@...r.kernel.org>, <devel@...verdev.osuosl.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        "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>,
        Amir Goldstein <amir73il@...il.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        "Dave Chinner" <david@...morbit.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Jan Kara <jack@...e.cz>,
        Richard Weinberger <richard@....at>,
        Linus Torvalds <torvalds@...ux-foundation.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 v8 11/24] erofs: introduce xattr & posixacl support

Hi Christoph,

On Mon, Sep 02, 2019 at 08:06:40AM -0700, Christoph Hellwig wrote:
> On Mon, Sep 02, 2019 at 04:20:37PM +0200, David Sterba wrote:
> > Oh right, I think the reasons are historical and that we can remove the
> > options nowadays. From the compatibility POV this should be safe, with
> > ACLs compiled out, no tool would use them, and no harm done when the
> > code is present but not used.
> > 
> > There were some efforts by embedded guys to make parts of kernel more
> > configurable to allow removing subsystems to reduce the final image
> > size. In this case I don't think it would make any noticeable
> > difference, eg. the size of fs/btrfs/acl.o on release config is 1.6KiB,
> > while the whole module is over 1.3MiB.
> 
> Given that the erofs folks have an actual use case for it I think
> it is fine to keep the options, I just wanted to ensure this wasn't
> copy and pasted for no good reason.  Note that for XFS we don't have
> an option for xattrs, as those are integral to a lot of file system
> features.  WE have an ACL option mostly for historic reasons.

Add a word, xattr is necessary for Android, but ACL is not.
I'm fine with killing these two, but EROFS can be used in
more wider embedded scenerios (other than Android), I have
no idea xattrs is useful for those embedded devices...

Thanks,
Gao Xiang