From: "Darrick J. Wong" <djwong@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: cem@kernel.org, stable@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 1/6] xfs: don't replace the wrong part of the cow fork
Date: Wed, 8 Jul 2026 08:25:16 -0700 [thread overview]
Message-ID: <20260708152516.GG9392@frogsfrogsfrogs> (raw)
In-Reply-To: <20260708091220.GA5902@lst.de>
On Wed, Jul 08, 2026 at 11:12:20AM +0200, Christoph Hellwig wrote:
> On Tue, Jul 07, 2026 at 10:03:24PM -0700, Darrick J. Wong wrote:
> > static inline void
> > xrep_cow_replace_mapping(
> > + struct xfs_inode *ip,
> > + struct xfs_iext_cursor *icur,
> > + struct xfs_bmbt_irec *got,
> > + struct xfs_bmbt_irec *rep)
>
> This looks like something that should sit in xfs_bmap.c (or at
> least xfs_bmap_util.c) and not in random scrub code.
>
> And I really wonder how we can get good test coverage for this, including
> for the original bug that this tries to address.
I'll post the debug patch I made that hijacks the errortag knob to make
it randomly shrink the range passed to mark_cow_range instead of the
entire iext record.
The original bug that this tries to address was a pile of bug fixes to
the xfs cow code that you posted for 5.1 that we neglected to backport
to 4.14, resulting in corruption of the cow fork mappings.
--D
next prev parent reply other threads:[~2026-07-08 15:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-08 5:03 [PATCHSET] xfs: LLM-inspired bug fixes, part 1 Darrick J. Wong
2026-07-08 5:03 ` [PATCH 1/6] xfs: don't replace the wrong part of the cow fork Darrick J. Wong
2026-07-08 9:12 ` Christoph Hellwig
2026-07-08 15:25 ` Darrick J. Wong [this message]
2026-07-08 17:57 ` Darrick J. Wong
2026-07-09 4:47 ` Christoph Hellwig
2026-07-09 16:45 ` Darrick J. Wong
2026-07-08 5:03 ` [PATCH 2/6] xfs: don't wrap around quota ids in dqiterate Darrick J. Wong
2026-07-08 9:14 ` Christoph Hellwig
2026-07-08 5:03 ` [PATCH 3/6] xfs: use rtrefcount btree cursor in xchk_xref_is_rt_cow_staging Darrick J. Wong
2026-07-08 9:15 ` Christoph Hellwig
2026-07-08 5:04 ` [PATCH 4/6] xfs: use the rt version of the cow staging checker Darrick J. Wong
2026-07-08 9:16 ` Christoph Hellwig
2026-07-08 5:04 ` [PATCH 5/6] xfs: write the rg superblock when fixing it Darrick J. Wong
2026-07-13 6:41 ` Christoph Hellwig
2026-07-13 21:58 ` Darrick J. Wong
2026-07-14 5:20 ` Christoph Hellwig
2026-07-08 5:04 ` [PATCH 6/6] xfs: grab rtrmap btree when checking rgsuper Darrick J. Wong
2026-07-08 9:16 ` Christoph Hellwig
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