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xfs: compute absolute maximum nlevels for each btree type

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Add code for all five btree types so that we can compute the absolute
maximum possible btree height for each btree type.  This is a setup for
the next patch, which makes every btree type have its own cursor cache.

The functions are exported so that we can have xfs_db report the
absolute maximum btree heights for each btree type, rather than making
everyone run their own ad-hoc computations.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2021-09-23 10:32:06 -07:00
parent bc8883eb77
commit 0ed5f7356d
14 changed files with 203 additions and 17 deletions
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1
fs/xfs/libxfs/xfs_ialloc.c
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@ -2793,6 +2793,7 @@ xfs_ialloc_setup_geometry(
inodes = (1LL << XFS_INO_AGINO_BITS(mp)) >> XFS_INODES_PER_CHUNK_LOG;
igeo->inobt_maxlevels = xfs_btree_compute_maxlevels(igeo->inobt_mnr,
inodes);
ASSERT(igeo->inobt_maxlevels <= xfs_iallocbt_maxlevels_ondisk());
/*
* Set the maximum inode count for this filesystem, being careful not