[linux-2.6-block.git] / fs / xfs / xfs_ialloc_btree.h

/*
 * 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_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_MASK(i)		((xfs_inofree_t)1 << (i))

static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
	return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(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;

/*
 * 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))

/*
 * Btree block header size depends on a superblock flag.
 *
 * (not quite yet, but soon)
 */
#define XFS_INOBT_BLOCK_LEN(mp)	XFS_BTREE_SBLOCK_LEN

/*
 * Record, key, and pointer address macros for btree blocks.
 *
 * (note that some of these may appear unused, but they are used in userspace)
 */
#define XFS_INOBT_REC_ADDR(mp, block, index) \
	((xfs_inobt_rec_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 (((index) - 1) * sizeof(xfs_inobt_rec_t))))

#define XFS_INOBT_KEY_ADDR(mp, block, index) \
	((xfs_inobt_key_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 ((index) - 1) * sizeof(xfs_inobt_key_t)))

#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
	((xfs_inobt_ptr_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 (maxrecs) * sizeof(xfs_inobt_key_t) + \
		 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))

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__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_IALLOC_BTREE_H__
	19	#define __XFS_IALLOC_BTREE_H__
	20
	21	/*
	22	* Inode map on-disk structures
	23	*/
	24
	25	struct xfs_buf;
	26	struct xfs_btree_cur;
1da177e4 LT	27	struct xfs_mount;
	28
	29	/*
	30	* There is a btree for the inode map per allocation group.
	31	*/
	32	#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
	33
	34	typedef __uint64_t xfs_inofree_t;
0d87e656	35	#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
1da177e4	36	#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
0d87e656 CH	37	#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
0d87e656 CH	38	#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
1da177e4	39
a844f451 NS	40	static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
a844f451 NS	41	{
0d87e656	42	return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
a844f451	43	}
1da177e4 LT	44
	45	/*
	46	* Data record structure
	47	*/
61a25848 CH	48	typedef struct xfs_inobt_rec {
	49	__be32 ir_startino; /* starting inode number */
	50	__be32 ir_freecount; /* count of free inodes (set bits) */
	51	__be64 ir_free; /* free inode mask */
	52	} xfs_inobt_rec_t;
	53
	54	typedef struct xfs_inobt_rec_incore {
1da177e4 LT	55	xfs_agino_t ir_startino; /* starting inode number */
	56	__int32_t ir_freecount; /* count of free inodes (set bits) */
	57	xfs_inofree_t ir_free; /* free inode mask */
61a25848 CH	58	} xfs_inobt_rec_incore_t;
61a25848 CH	59
1da177e4 LT	60
	61	/*
	62	* Key structure
	63	*/
61a25848 CH	64	typedef struct xfs_inobt_key {
61a25848 CH	65	__be32 ir_startino; /* starting inode number */
1da177e4 LT	66	} xfs_inobt_key_t;
1da177e4 LT	67
16259e7d CH	68	/* btree pointer type */
	69	typedef __be32 xfs_inobt_ptr_t;
	70
1da177e4 LT	71	/*
	72	* block numbers in the AG.
	73	*/
a844f451 NS	74	#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
a844f451 NS	75	#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1da177e4	76
7cc95a82 CH	77	/*
	78	* Btree block header size depends on a superblock flag.
	79	*
	80	* (not quite yet, but soon)
	81	*/
	82	#define XFS_INOBT_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN
	83
1da177e4 LT	84	/*
1da177e4 LT	85	* Record, key, and pointer address macros for btree blocks.
136341b4 CH	86	*
136341b4 CH	87	* (note that some of these may appear unused, but they are used in userspace)
1da177e4	88	*/
136341b4 CH	89	#define XFS_INOBT_REC_ADDR(mp, block, index) \
	90	((xfs_inobt_rec_t *) \
	91	((char *)(block) + \
7cc95a82	92	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	93	(((index) - 1) * sizeof(xfs_inobt_rec_t))))
	94
	95	#define XFS_INOBT_KEY_ADDR(mp, block, index) \
	96	((xfs_inobt_key_t *) \
	97	((char *)(block) + \
7cc95a82	98	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	99	((index) - 1) * sizeof(xfs_inobt_key_t)))
	100
	101	#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
	102	((xfs_inobt_ptr_t *) \
	103	((char *)(block) + \
7cc95a82	104	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	105	(maxrecs) * sizeof(xfs_inobt_key_t) + \
136341b4 CH	106	((index) - 1) * sizeof(xfs_inobt_ptr_t)))
1da177e4	107
561f7d17 CH	108	extern struct xfs_btree_cur xfs_inobt_init_cursor(struct xfs_mount ,
561f7d17 CH	109	struct xfs_trans , struct xfs_buf , xfs_agnumber_t);
60197e8d	110	extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
561f7d17	111
1da177e4	112	#endif /* __XFS_IALLOC_BTREE_H__ */