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xfs: validate that zoned RT devices are zone aligned

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Garbage collection assumes all zones contain the full amount of blocks.
Mkfs already ensures this happens, but make the kernel check it as well
to avoid getting into trouble due to fuzzers or mkfs bugs.

Fixes: 2167eaabe2 ("xfs: define the zoned on-disk format")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Cc: stable@vger.kernel.org # v6.15
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Christoph Hellwig
2025-12-16 18:30:08 +01:00
committed by Carlos Maiolino
parent 8dc15b7a6e
commit 982d2616a2
1 changed files with 15 additions and 0 deletions
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15
fs/xfs/libxfs/xfs_sb.c
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@@ -301,6 +301,21 @@ xfs_validate_rt_geometry(
sbp->sb_rbmblocks != xfs_expected_rbmblocks(sbp))
return false;
if (xfs_sb_is_v5(sbp) &&
(sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED)) {
uint32_t mod;
/*
* Zoned RT devices must be aligned to the RT group size,
* because garbage collection assumes that all zones have the
* same size to avoid insane complexity if that weren't the
* case.
*/
div_u64_rem(sbp->sb_rextents, sbp->sb_rgextents, &mod);
if (mod)
return false;
}
return true;
}