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Cleanup maxrecs calculation.

Clean up the way the maximum and minimum records for the btree blocks are
calculated.  For the alloc and inobt btrees all the values are pre-calculated
in xfs_mount_common, and we switch the current loop around the ugly generic
macros that use cpp token pasting to generate type names to two small helpers
in normal C code.  For the bmbt and bmdr trees these helpers also exist,
but can be called during runtime, too.  Here we also kill various macros
dealing with them and inline the logic into the get_minrecs / get_maxrecs /
get_dmaxrecs methods in xfs_bmap_btree.c.

Note that all these new helpers take an xfs_mount * argument which will
be needed to determine the size of a btree block once we add support for
extended btree blocks with CRCs and other RAS information.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:32292a by kenmcd.

  Cleanup maxrecs calculation.

/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_IALLOC_BTREE_H__
#define	__XFS_IALLOC_BTREE_H__

/*
 * Inode map on-disk structures
 */

struct xfs_buf;
struct xfs_btree_cur;
struct xfs_btree_sblock;
struct xfs_mount;

/*
 * There is a btree for the inode map per allocation group.
 */
#define	XFS_IBT_MAGIC	0x49414254	/* 'IABT' */

typedef	__uint64_t	xfs_inofree_t;
#define	XFS_INODES_PER_CHUNK	(NBBY * sizeof(xfs_inofree_t))
#define	XFS_INODES_PER_CHUNK_LOG	(XFS_NBBYLOG + 3)
#define	XFS_INOBT_ALL_FREE	((xfs_inofree_t)-1)

#define	XFS_INOBT_MASKN(i,n)		xfs_inobt_maskn(i,n)
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
	return (((n) >= XFS_INODES_PER_CHUNK ? \
		(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
}

/*
 * Data record structure
 */
typedef struct xfs_inobt_rec {
	__be32		ir_startino;	/* starting inode number */
	__be32		ir_freecount;	/* count of free inodes (set bits) */
	__be64		ir_free;	/* free inode mask */
} xfs_inobt_rec_t;

typedef struct xfs_inobt_rec_incore {
	xfs_agino_t	ir_startino;	/* starting inode number */
	__int32_t	ir_freecount;	/* count of free inodes (set bits) */
	xfs_inofree_t	ir_free;	/* free inode mask */
} xfs_inobt_rec_incore_t;


/*
 * Key structure
 */
typedef struct xfs_inobt_key {
	__be32		ir_startino;	/* starting inode number */
} xfs_inobt_key_t;

/* btree pointer type */
typedef __be32 xfs_inobt_ptr_t;

/* btree block header type */
typedef	struct xfs_btree_sblock xfs_inobt_block_t;

#define	XFS_BUF_TO_INOBT_BLOCK(bp)	((xfs_inobt_block_t *)XFS_BUF_PTR(bp))

/*
 * Bit manipulations for ir_free.
 */
#define	XFS_INOBT_MASK(i)		((xfs_inofree_t)1 << (i))
#define	XFS_INOBT_IS_FREE(rp,i)		\
		(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
#define	XFS_INOBT_SET_FREE(rp,i)	((rp)->ir_free |= XFS_INOBT_MASK(i))
#define	XFS_INOBT_CLR_FREE(rp,i)	((rp)->ir_free &= ~XFS_INOBT_MASK(i))

/*
 * Maximum number of inode btree levels.
 */
#define	XFS_IN_MAXLEVELS(mp)		((mp)->m_in_maxlevels)

/*
 * block numbers in the AG.
 */
#define	XFS_IBT_BLOCK(mp)		((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
#define	XFS_PREALLOC_BLOCKS(mp)		((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))

/*
 * Record, key, and pointer address macros for btree blocks.
 */
#define XFS_INOBT_REC_ADDR(bb,i,cur) \
	(XFS_BTREE_REC_ADDR(xfs_inobt, bb, i))

#define	XFS_INOBT_KEY_ADDR(bb,i,cur) \
	(XFS_BTREE_KEY_ADDR(xfs_inobt, bb, i))

#define	XFS_INOBT_PTR_ADDR(bb,i,cur) \
	(XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
				i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))

extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
		struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);

#endif	/* __XFS_IALLOC_BTREE_H__ */