Re: [PATCH] sysv: Remove the filesystem

["Darrick J. Wong" <djwong@kernel.org>]

On Mon, Jan 06, 2025 at 02:52:11PM -0500, Jeff Layton wrote:
> On Mon, 2025-01-06 at 17:24 +0100, Jan Kara wrote:
> > Since 2002 (change "Replace BKL for chain locking with sysvfs-private
> > rwlock") the sysv filesystem was doing IO under a rwlock in its
> > get_block() function (yes, a non-sleepable lock hold over a function
> > used to read inode metadata for all reads and writes).  Nobody noticed
> > until syzbot in 2023 [1]. This shows nobody is using the filesystem.
> > Just drop it.
> > 
> > [1] https://lore.kernel.org/all/0000000000000ccf9a05ee84f5b0@google.com/
> > 
> > Signed-off-by: Jan Kara <jack@suse.cz>
> > ---
> >  What do people think about this? Or should we perhaps go through a (short)
> >  deprecation period where we warn about removal?
> > 
> 
> FWIW, it was orphaned in 2023:
> 
>     commit a8cd2990b694ed2c0ef0e8fc80686c664b4ebbe5
>     Author: Christoph Hellwig <hch@lst.de>
>     Date:   Thu Feb 16 07:29:22 2023 +0100
> 
>         orphan sysvfs
>     
>         This code has been stale for years and I have no way to test it.
> 
> 
> Given how long this was broken with no one noticing, and since it's not
> being adequately tested, I vote we remove it.

I concur, if someone really wants this we can always add it back (after
making them deal with the bugs):

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> 
> Reviewed-by: Jeff Layton <jlayton@kernel.org>
>