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xfs: compute the maximum height of the rmap btree when reflink enabled

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Instead of assuming that the hardcoded XFS_BTREE_MAXLEVELS value is big
enough to handle the maximally tall rmap btree when all blocks are in
use and maximally shared, let's compute the maximum height assuming the
rmapbt consumes as many blocks as possible.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2021-09-16 12:27:43 -07:00
parent 1b236ad7ba
commit 9ec691205e
5 changed files with 85 additions and 18 deletions
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fs/xfs/libxfs/xfs_btree.h
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@ -491,6 +491,8 @@ unsigned int xfs_btree_compute_maxlevels(const unsigned int *limits,
unsigned long long records);
unsigned long long xfs_btree_calc_size(const unsigned int *limits,
unsigned long long records);
unsigned int xfs_btree_space_to_height(const unsigned int *limits,
unsigned long long blocks);
/*
* Return codes for the query range iterator function are 0 to continue