From 0571c857fe326141e35162f5a05e6b89789840bf Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Thu, 28 Apr 2022 15:39:02 -0400 Subject: [PATCH] xfs: fix maxlevels comparisons in the btree staging code Source kernel commit: 78e8ec83a404d63dcc86b251f42e4ee8aff27465 The btree geometry computation function has an off-by-one error in that it does not allow maximally tall btrees (nlevels == XFS_BTREE_MAXLEVELS). This can result in repairs failing unnecessarily on very fragmented filesystems. Subsequent patches to remove MAXLEVELS usage in favor of the per-btree type computations will make this a much more likely occurrence. Signed-off-by: Darrick J. Wong Reviewed-by: Chandan Babu R Reviewed-by: Christoph Hellwig Signed-off-by: Eric Sandeen --- libxfs/xfs_btree_staging.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libxfs/xfs_btree_staging.c b/libxfs/xfs_btree_staging.c index 146d2475e..daf997977 100644 --- a/libxfs/xfs_btree_staging.c +++ b/libxfs/xfs_btree_staging.c @@ -662,7 +662,7 @@ xfs_btree_bload_compute_geometry( xfs_btree_bload_ensure_slack(cur, &bbl->node_slack, 1); bbl->nr_records = nr_this_level = nr_records; - for (cur->bc_nlevels = 1; cur->bc_nlevels < XFS_BTREE_MAXLEVELS;) { + for (cur->bc_nlevels = 1; cur->bc_nlevels <= XFS_BTREE_MAXLEVELS;) { uint64_t level_blocks; uint64_t dontcare64; unsigned int level = cur->bc_nlevels - 1; @@ -724,7 +724,7 @@ xfs_btree_bload_compute_geometry( nr_this_level = level_blocks; } - if (cur->bc_nlevels == XFS_BTREE_MAXLEVELS) + if (cur->bc_nlevels > XFS_BTREE_MAXLEVELS) return -EOVERFLOW; bbl->btree_height = cur->bc_nlevels; -- 2.47.2