diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 0e831f04725c..5729474e362f 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1698,11 +1698,16 @@ struct xfs_ino_geometry {
 	/* Maximum inode count in this filesystem. */
 	uint64_t	maxicount;
 
+	/* Actual inode cluster buffer size, in bytes. */
+	unsigned int	inode_cluster_size;
+
 	/*
 	 * Desired inode cluster buffer size, in bytes.  This value is not
-	 * rounded up to at least one filesystem block.
+	 * rounded up to at least one filesystem block, which is necessary for
+	 * the sole purpose of validating sb_spino_align.  Runtime code must
+	 * only ever use inode_cluster_size.
 	 */
-	unsigned int	inode_cluster_size;
+	unsigned int	inode_cluster_size_raw;
 
 	/* Inode cluster sizes, adjusted to be at least 1 fsb. */
 	unsigned int	inodes_per_cluster;
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index fdfcc03a35b9..0f5ff2a4b0b8 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -2805,21 +2805,32 @@ xfs_ialloc_setup_geometry(
 		igeo->maxicount = 0;
 	}
 
-	igeo->inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
+	/*
+	 * Compute the desired size of an inode cluster buffer size, which
+	 * starts at 8K and (on v5 filesystems) scales up with larger inode
+	 * sizes.
+	 *
+	 * Preserve the desired inode cluster size because the sparse inodes
+	 * feature uses that desired size (not the actual size) to compute the
+	 * sparse inode alignment.  The mount code validates this value, so we
+	 * cannot change the behavior.
+	 */
+	igeo->inode_cluster_size_raw = XFS_INODE_BIG_CLUSTER_SIZE;
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
-		int	new_size = igeo->inode_cluster_size;
+		int	new_size = igeo->inode_cluster_size_raw;
 
 		new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE;
 		if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size))
-			igeo->inode_cluster_size = new_size;
+			igeo->inode_cluster_size_raw = new_size;
 	}
 
 	/* Calculate inode cluster ratios. */
-	if (igeo->inode_cluster_size > mp->m_sb.sb_blocksize)
+	if (igeo->inode_cluster_size_raw > mp->m_sb.sb_blocksize)
 		igeo->blocks_per_cluster = XFS_B_TO_FSBT(mp,
-				igeo->inode_cluster_size);
+				igeo->inode_cluster_size_raw);
 	else
 		igeo->blocks_per_cluster = 1;
+	igeo->inode_cluster_size = XFS_FSB_TO_B(mp, igeo->blocks_per_cluster);
 	igeo->inodes_per_cluster = XFS_FSB_TO_INO(mp, igeo->blocks_per_cluster);
 
 	/* Calculate inode cluster alignment. */
diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c
index 2663dd7975a5..9d1326d14af9 100644
--- a/fs/xfs/libxfs/xfs_trans_resv.c
+++ b/fs/xfs/libxfs/xfs_trans_resv.c
@@ -308,8 +308,7 @@ xfs_calc_iunlink_remove_reservation(
 	struct xfs_mount        *mp)
 {
 	return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
-	       2 * max_t(uint, XFS_FSB_TO_B(mp, 1),
-			 M_IGEO(mp)->inode_cluster_size);
+	       2 * M_IGEO(mp)->inode_cluster_size;
 }
 
 /*
@@ -347,8 +346,7 @@ STATIC uint
 xfs_calc_iunlink_add_reservation(xfs_mount_t *mp)
 {
 	return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
-			max_t(uint, XFS_FSB_TO_B(mp, 1),
-			      M_IGEO(mp)->inode_cluster_size);
+			M_IGEO(mp)->inode_cluster_size;
 }
 
 /*
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1557304f3d68..f7c062df29bf 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2893,8 +2893,7 @@ xlog_recover_buffer_pass2(
 	 */
 	if (XFS_DINODE_MAGIC ==
 	    be16_to_cpu(*((__be16 *)xfs_buf_offset(bp, 0))) &&
-	    (BBTOB(bp->b_io_length) != max(log->l_mp->m_sb.sb_blocksize,
-			M_IGEO(log->l_mp)->inode_cluster_size))) {
+	    (BBTOB(bp->b_io_length) != M_IGEO(log->l_mp)->inode_cluster_size)) {
 		xfs_buf_stale(bp);
 		error = xfs_bwrite(bp);
 	} else {
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 81d6535b24b4..544fa469aca4 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -746,11 +746,11 @@ xfs_mountfs(
 	 */
 	if (xfs_sb_version_hassparseinodes(&mp->m_sb) &&
 	    mp->m_sb.sb_spino_align !=
-			XFS_B_TO_FSBT(mp, igeo->inode_cluster_size)) {
+			XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw)) {
 		xfs_warn(mp,
 	"Sparse inode block alignment (%u) must match cluster size (%llu).",
 			 mp->m_sb.sb_spino_align,
-			 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size));
+			 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw));
 		error = -EINVAL;
 		goto out_remove_uuid;
 	}