xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions

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The _maxlevels_ondisk functions are used to compute the size of
in-memory btree cursors for each btree type.  Unfortunately, LOLLM
noticed that the rtrmap and rtrefcount versions of these functions
forget to account for the inode root, which means that we could access
beyond the end of the cursor given a sufficiently large btree.  Fix
this.

Cc: stable@vger.kernel.org # v6.14
Fixes: 9abe03a0e4 ("xfs: introduce realtime refcount btree ondisk definitions")
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 2026-09-01 22:43:02 -07:00 • committed by Carlos Maiolino

parent 2eac8d01d2

commit aa301322f7

2 changed files with 8 additions and 3 deletions

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7

fs/xfs/libxfs/xfs_rtrefcount_btree.c

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4

fs/xfs/libxfs/xfs_rtrmap_btree.c

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