xfs: precalculate cluster alignment in inodes and blocks

Store the inode cluster alignment information in units of inodes and
blocks in the mount data so that we don't have to keep recalculating
them.

Signed-off-by: Darrick J. Wong <[e-mail]>
Reviewed-by: Brian Foster <[e-mail]>

fs/xfs/libxfs/xfs_ialloc.c

···
 		 * but not to use them in the actual exact allocation.
 		 */
 		args.alignment = 1;
-		args.minalignslop = xfs_ialloc_cluster_alignment(args.mp) - 1;
+		args.minalignslop = args.mp->m_cluster_align - 1;
 
 		/* Allow space for the inode btree to split. */
 		args.minleft = args.mp->m_in_maxlevels - 1;
···
 			args.alignment = args.mp->m_dalign;
 			isaligned = 1;
 		} else
-			args.alignment = xfs_ialloc_cluster_alignment(args.mp);
+			args.alignment = args.mp->m_cluster_align;
 		/*
 		 * Need to figure out where to allocate the inode blocks.
 		 * Ideally they should be spaced out through the a.g.
···
 		args.type = XFS_ALLOCTYPE_NEAR_BNO;
 		args.agbno = be32_to_cpu(agi->agi_root);
 		args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
-		args.alignment = xfs_ialloc_cluster_alignment(args.mp);
+		args.alignment = args.mp->m_cluster_align;
 		if ((error = xfs_alloc_vextent(&args)))
 			return error;
 	}
···
 		 */
 		ineed = mp->m_ialloc_min_blks;
 		if (flags && ineed > 1)
-			ineed += xfs_ialloc_cluster_alignment(mp);
+			ineed += mp->m_cluster_align;
 		longest = pag->pagf_longest;
 		if (!longest)
 			longest = pag->pagf_flcount > 0;

fs/xfs/libxfs/xfs_types.c

···
 	 * Calculate the first inode, which will be in the first
 	 * cluster-aligned block after the AGFL.
 	 */
-	bno = round_up(XFS_AGFL_BLOCK(mp) + 1,
-			xfs_ialloc_cluster_alignment(mp));
+	bno = round_up(XFS_AGFL_BLOCK(mp) + 1, mp->m_cluster_align);
 	*first = XFS_AGB_TO_AGINO(mp, bno);
 
 	/*
 	 * Calculate the last inode, which will be at the end of the
 	 * last (aligned) cluster that can be allocated in the AG.
 	 */
-	bno = round_down(eoag, xfs_ialloc_cluster_alignment(mp));
+	bno = round_down(eoag, mp->m_cluster_align);
 	*last = XFS_AGB_TO_AGINO(mp, bno) - 1;
 }
 

fs/xfs/scrub/ialloc.c

···
 
 	/* Make sure this record is aligned to cluster and inoalignmnt size. */
 	agbno = XFS_AGINO_TO_AGBNO(mp, irec.ir_startino);
-	if ((agbno & (xfs_ialloc_cluster_alignment(mp) - 1)) ||
+	if ((agbno & (mp->m_cluster_align - 1)) ||
 	    (agbno & (mp->m_blocks_per_cluster - 1)))
 		xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 

fs/xfs/xfs_mount.c

···
 	}
 	mp->m_blocks_per_cluster = xfs_icluster_size_fsb(mp);
 	mp->m_inodes_per_cluster = XFS_FSB_TO_INO(mp, mp->m_blocks_per_cluster);
+	mp->m_cluster_align = xfs_ialloc_cluster_alignment(mp);
+	mp->m_cluster_align_inodes = XFS_FSB_TO_INO(mp, mp->m_cluster_align);
 
 	/*
 	 * If enabled, sparse inode chunk alignment is expected to match the

fs/xfs/xfs_mount.h

···
 	uint			m_inode_cluster_size;/* min inode buf size */
 	unsigned int		m_inodes_per_cluster;
 	unsigned int		m_blocks_per_cluster;
+	unsigned int		m_cluster_align;
+	unsigned int		m_cluster_align_inodes;
 	uint			m_blockmask;	/* sb_blocksize-1 */
 	uint			m_blockwsize;	/* sb_blocksize in words */
 	uint			m_blockwmask;	/* blockwsize-1 */