[mirror_ubuntu-bionic-kernel.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;

/*
 * Btree block header size depends on a superblock flag.
 */
#define XFS_INOBT_BLOCK_LEN(mp) \
	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
		XFS_BTREE_SBLOCK_CRC_LEN : 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;
1da177e4 LT	28
7cc95a82 CH	29	/*
7cc95a82 CH	30	* Btree block header size depends on a superblock flag.
7cc95a82	31	*/
ee1a47ab CH	32	#define XFS_INOBT_BLOCK_LEN(mp) \
	33	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
	34	XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
7cc95a82	35
1da177e4 LT	36	/*
1da177e4 LT	37	* Record, key, and pointer address macros for btree blocks.
136341b4 CH	38	*
136341b4 CH	39	* (note that some of these may appear unused, but they are used in userspace)
1da177e4	40	*/
136341b4 CH	41	#define XFS_INOBT_REC_ADDR(mp, block, index) \
	42	((xfs_inobt_rec_t *) \
	43	((char *)(block) + \
7cc95a82	44	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	45	(((index) - 1) * sizeof(xfs_inobt_rec_t))))
	46
	47	#define XFS_INOBT_KEY_ADDR(mp, block, index) \
	48	((xfs_inobt_key_t *) \
	49	((char *)(block) + \
7cc95a82	50	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	51	((index) - 1) * sizeof(xfs_inobt_key_t)))
	52
	53	#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
	54	((xfs_inobt_ptr_t *) \
	55	((char *)(block) + \
7cc95a82	56	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	57	(maxrecs) * sizeof(xfs_inobt_key_t) + \
136341b4 CH	58	((index) - 1) * sizeof(xfs_inobt_ptr_t)))
1da177e4	59
561f7d17 CH	60	extern struct xfs_btree_cur xfs_inobt_init_cursor(struct xfs_mount ,
561f7d17 CH	61	struct xfs_trans , struct xfs_buf , xfs_agnumber_t);
60197e8d	62	extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
561f7d17	63
1da177e4	64	#endif /* __XFS_IALLOC_BTREE_H__ */