xfs: fix xfs_rtrmapbt_mem_cursor for non-rmap filesystems

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It's possible to construct an in-memory rtrmap btree for filesystems
that don't have the rmap feature enabled.  The kernel doesn't do this,
but xfs_repair will, if asked to reindex a filesystem that has rtreflink
enabled but not rtrmap.  Therefore, we must create the cursor with
enough levels to handle a maximally sized btree possible.

Note that the rtrmapbt btree cursor slab creates objects large enough to
handle xfs_rtrmap_maxlevels_ondisk() levels, so setting bc_nlevels to
the same value isn't costing us any extra memory.

Cc: stable@vger.kernel.org # v6.14
Fixes: 4a61f12eb1 ("xfs: create a shadow rmap btree during realtime rmap repair")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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Darrick J. Wong 2026-09-01 22:43:34 -07:00 • committed by Carlos Maiolino

parent aa301322f7

commit 022d5f5fce

1 changed files with 1 additions and 1 deletions

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fs/xfs/libxfs/xfs_rtrmap_btree.c

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