linux-kernel - Re: [PATCH] erofs: move erofs out of staging

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Message-ID: <20190817233843.GA16991@hsiangkao-HP-ZHAN-66-Pro-G1>
Date:   Sun, 18 Aug 2019 07:38:48 +0800
From:   Gao Xiang <hsiangkao@....com>
To:     Richard Weinberger <richard@....at>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        devel <devel@...verdev.osuosl.org>,
        linux-erofs <linux-erofs@...ts.ozlabs.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, tytso <tytso@....edu>,
        Pavel Machek <pavel@...x.de>, David Sterba <dsterba@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Darrick <darrick.wong@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Jan Kara <jack@...e.cz>,
        torvalds <torvalds@...ux-foundation.org>,
        Chao Yu <yuchao0@...wei.com>, Miao Xie <miaoxie@...wei.com>,
        Li Guifu <bluce.liguifu@...wei.com>,
        Fang Wei <fangwei1@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>
Subject: Re: [PATCH] erofs: move erofs out of staging

Hi Richard,

On Sun, Aug 18, 2019 at 01:25:58AM +0200, Richard Weinberger wrote:
> ----- Urspr?ngliche Mail -----
> >> How does erofs compare to squashfs?
> >> IIUC it is designed to be faster. Do you have numbers?
> >> Feel free to point me older mails if you already showed numbers,
> >> I have to admit I didn't follow the development very closely.
> > 
> > You can see the following related material which has microbenchmark
> > tested on my laptop:
> > https://static.sched.com/hosted_files/kccncosschn19eng/19/EROFS%20file%20system_OSS2019_Final.pdf
> > 
> > which was mentioned in the related topic as well:
> > https://lore.kernel.org/r/20190815044155.88483-1-gaoxiang25@huawei.com/
> 
> Thanks!
> Will read into.

Yes, it was mentioned in the related topic from v1 and I you can have
a try with the latest kernel and enwik9 silesia.tar testdata.

> 
> While digging a little into the code I noticed that you have very few
> checks of the on-disk data.
> For example ->u.i_blkaddr. I gave it a try and created a
> malformed filesystem where u.i_blkaddr is 0xdeadbeef, it causes the kernel
> to loop forever around erofs_read_raw_page().

I don't fuzz all the on-disk fields for EROFS, I will do later..
You can see many in-kernel filesystems are still hardening the related
stuff. Anyway, I will dig into this field you mentioned recently, but
I think it can be fixed easily later.

Thanks,
Gao Xiang 

> 
> Thanks,
> //richard