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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>
This commit is contained in:
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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2
fs/xfs/libxfs/xfs_rtrmap_btree.c
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@ -618,7 +618,7 @@ xfs_rtrmapbt_mem_cursor(
struct xfs_btree_cur *cur;
cur = xfs_btree_alloc_cursor(mp, tp, &xfs_rtrmapbt_mem_ops,
mp->m_rtrmap_maxlevels, xfs_rtrmapbt_cur_cache);
xfs_rtrmapbt_maxlevels_ondisk(), xfs_rtrmapbt_cur_cache);
cur->bc_mem.xfbtree = xfbt;
cur->bc_nlevels = xfbt->nlevels;
cur->bc_group = xfs_group_hold(rtg_group(rtg));