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xfs: cross-reference the rtgroup superblock extent, not block

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LOLLM noticed that when libxfs creates a realtime superblock, it will
create an rtrmapbt record covering the entire rtextent in which the
superblock lives.  However, the cross-referencing checks only look for
the first block, which means that we can miss a corrupt rtrmap record.
That will get picked up by the rtrmap scrubber, but we should make the
rgsuper scrubber more robust anyway.

Cc: stable@vger.kernel.org # v6.13
Fixes: 3f1bdf50ab ("xfs: scrub the realtime group superblock")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Assisted-by: LOLLM # finding obvious bugs
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Darrick J. Wong 2026-09-02 22:51:05 -07:00 committed by Carlos Maiolino
parent e8b01aaaff
commit 79ab1af203
1 changed files with 4 additions and 2 deletions
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6
fs/xfs/scrub/rgsuper.c
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@ -36,8 +36,10 @@ xchk_rgsuperblock_xref(
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
xchk_xref_is_used_rt_space(sc, xfs_rgbno_to_rtb(sc->sr.rtg, 0), 1);
xchk_xref_is_only_rt_owned_by(sc, 0, 1, &XFS_RMAP_OINFO_FS);
xchk_xref_is_used_rt_space(sc, xfs_rgbno_to_rtb(sc->sr.rtg, 0),
sc->mp->m_sb.sb_rextsize);
xchk_xref_is_only_rt_owned_by(sc, 0, sc->mp->m_sb.sb_rextsize,
&XFS_RMAP_OINFO_FS);
}
int