xfs: validate ag btree levels using the precomputed values

Use the AG btree height limits that we precomputed into the xfs_mount to
validate the AG headers instead of using XFS_BTREE_MAXLEVELS.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/libxfs/xfs_alloc.c

@@ -2906,13 +2906,13 @@ xfs_agf_verify(
 
 	if (be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) < 1 ||
 	    be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) < 1 ||
-	    be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > XFS_BTREE_MAXLEVELS ||
-	    be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > XFS_BTREE_MAXLEVELS)
+	    be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > mp->m_ag_maxlevels ||
+	    be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > mp->m_ag_maxlevels)
 		return __this_address;
 
 	if (xfs_sb_version_hasrmapbt(&mp->m_sb) &&
 	    (be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) < 1 ||
-	     be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS))
+	     be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > mp->m_rmap_maxlevels))
 		return __this_address;
 
 	if (xfs_sb_version_hasrmapbt(&mp->m_sb) &&
@@ -2939,7 +2939,7 @@ xfs_agf_verify(
 
 	if (xfs_sb_version_hasreflink(&mp->m_sb) &&
 	    (be32_to_cpu(agf->agf_refcount_level) < 1 ||
-	     be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS))
+	     be32_to_cpu(agf->agf_refcount_level) > mp->m_refc_maxlevels))
 		return __this_address;
 
 	return NULL;

fs/xfs/libxfs/xfs_ialloc.c

@@ -2535,12 +2535,12 @@ xfs_agi_verify(
 		return __this_address;
 
 	if (be32_to_cpu(agi->agi_level) < 1 ||
-	    be32_to_cpu(agi->agi_level) > XFS_BTREE_MAXLEVELS)
+	    be32_to_cpu(agi->agi_level) > M_IGEO(mp)->inobt_maxlevels)
 		return __this_address;
 
 	if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
 	    (be32_to_cpu(agi->agi_free_level) < 1 ||
-	     be32_to_cpu(agi->agi_free_level) > XFS_BTREE_MAXLEVELS))
+	     be32_to_cpu(agi->agi_free_level) > M_IGEO(mp)->inobt_maxlevels))
 		return __this_address;
 
 	/*

fs/xfs/libxfs/xfs_inode_fork.c

@@ -195,7 +195,7 @@ xfs_iformat_btree(
 		     XFS_BMDR_SPACE_CALC(nrecs) >
 					XFS_DFORK_SIZE(dip, mp, whichfork) ||
 		     ifp->if_nextents > ip->i_d.di_nblocks) ||
-		     level == 0 || level > XFS_BTREE_MAXLEVELS) {
+		     level == 0 || level > XFS_BM_MAXLEVELS(mp, whichfork)) {
 		xfs_warn(mp, "corrupt inode %Lu (btree).",
 					(unsigned long long) ip->i_ino);
 		xfs_inode_verifier_error(ip, -EFSCORRUPTED,