fs/xfs/xfs_ag.h - linux/kernel/git/mellanox/linux - Git at Google

 /*
  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 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.
  *
  * Further, this software is distributed without any warranty that it is
  * free of the rightful claim of any third person regarding infringement
  * or the like.  Any license provided herein, whether implied or
  * otherwise, applies only to this software file.  Patent licenses, if
  * any, provided herein do not apply to combinations of this program with
  * other software, or any other product whatsoever.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write the Free Software Foundation, Inc., 59
  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  *
  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  * Mountain View, CA  94043, or:
  *
  * http://www.sgi.com
  *
  * For further information regarding this notice, see:
  *
  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  */
 #ifndef __XFS_AG_H__
 #define	__XFS_AG_H__

 /*
  * Allocation group header
  * This is divided into three structures, placed in sequential 512-byte
  * buffers after a copy of the superblock (also in a 512-byte buffer).
  */

 struct xfs_buf;
 struct xfs_mount;
 struct xfs_trans;

 #define	XFS_AGF_MAGIC	0x58414746	/* 'XAGF' */
 #define	XFS_AGI_MAGIC	0x58414749	/* 'XAGI' */
 #define	XFS_AGF_VERSION	1
 #define	XFS_AGI_VERSION	1
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGF_GOOD_VERSION)
 int xfs_agf_good_version(unsigned v);
 #define	XFS_AGF_GOOD_VERSION(v)	xfs_agf_good_version(v)
 #else
 #define XFS_AGF_GOOD_VERSION(v)		((v) == XFS_AGF_VERSION)
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGI_GOOD_VERSION)
 int xfs_agi_good_version(unsigned v);
 #define	XFS_AGI_GOOD_VERSION(v)	xfs_agi_good_version(v)
 #else
 #define XFS_AGI_GOOD_VERSION(v)		((v) == XFS_AGI_VERSION)
 #endif

 /*
  * Btree number 0 is bno, 1 is cnt.  This value gives the size of the
  * arrays below.
  */
 #define	XFS_BTNUM_AGF	((int)XFS_BTNUM_CNTi + 1)

 /*
  * The second word of agf_levels in the first a.g. overlaps the EFS
  * superblock's magic number.  Since the magic numbers valid for EFS
  * are > 64k, our value cannot be confused for an EFS superblock's.
  */

 typedef struct xfs_agf
 {
 	/*
 	 * Common allocation group header information
 	 */
 	__uint32_t	agf_magicnum;	/* magic number == XFS_AGF_MAGIC */
 	__uint32_t	agf_versionnum;	/* header version == XFS_AGF_VERSION */
 	xfs_agnumber_t	agf_seqno;	/* sequence # starting from 0 */
 	xfs_agblock_t	agf_length;	/* size in blocks of a.g. */
 	/*
 	 * Freespace information
 	 */
 	xfs_agblock_t	agf_roots[XFS_BTNUM_AGF];	/* root blocks */
 	__uint32_t	agf_spare0;	/* spare field */
 	__uint32_t	agf_levels[XFS_BTNUM_AGF];	/* btree levels */
 	__uint32_t	agf_spare1;	/* spare field */
 	__uint32_t	agf_flfirst;	/* first freelist block's index */
 	__uint32_t	agf_fllast;	/* last freelist block's index */
 	__uint32_t	agf_flcount;	/* count of blocks in freelist */
 	xfs_extlen_t	agf_freeblks;	/* total free blocks */
 	xfs_extlen_t	agf_longest;	/* longest free space */
 } xfs_agf_t;

 #define	XFS_AGF_MAGICNUM	0x00000001
 #define	XFS_AGF_VERSIONNUM	0x00000002
 #define	XFS_AGF_SEQNO		0x00000004
 #define	XFS_AGF_LENGTH		0x00000008
 #define	XFS_AGF_ROOTS		0x00000010
 #define	XFS_AGF_LEVELS		0x00000020
 #define	XFS_AGF_FLFIRST		0x00000040
 #define	XFS_AGF_FLLAST		0x00000080
 #define	XFS_AGF_FLCOUNT		0x00000100
 #define	XFS_AGF_FREEBLKS	0x00000200
 #define	XFS_AGF_LONGEST		0x00000400
 #define	XFS_AGF_NUM_BITS	11
 #define	XFS_AGF_ALL_BITS	((1 << XFS_AGF_NUM_BITS) - 1)

 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGF_DADDR(mp)	((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGF_BLOCK)
 xfs_agblock_t xfs_agf_block(struct xfs_mount *mp);
 #define	XFS_AGF_BLOCK(mp)	xfs_agf_block(mp)
 #else
 #define XFS_AGF_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
 #endif

 /*
  * Size of the unlinked inode hash table in the agi.
  */
 #define	XFS_AGI_UNLINKED_BUCKETS	64

 typedef struct xfs_agi
 {
 	/*
 	 * Common allocation group header information
 	 */
 	__uint32_t	agi_magicnum;	/* magic number == XFS_AGI_MAGIC */
 	__uint32_t	agi_versionnum;	/* header version == XFS_AGI_VERSION */
 	xfs_agnumber_t	agi_seqno;	/* sequence # starting from 0 */
 	xfs_agblock_t	agi_length;	/* size in blocks of a.g. */
 	/*
 	 * Inode information
 	 * Inodes are mapped by interpreting the inode number, so no
 	 * mapping data is needed here.
 	 */
 	xfs_agino_t	agi_count;	/* count of allocated inodes */
 	xfs_agblock_t	agi_root;	/* root of inode btree */
 	__uint32_t	agi_level;	/* levels in inode btree */
 	xfs_agino_t	agi_freecount;	/* number of free inodes */
 	xfs_agino_t	agi_newino;	/* new inode just allocated */
 	xfs_agino_t	agi_dirino;	/* last directory inode chunk */
 	/*
 	 * Hash table of inodes which have been unlinked but are
 	 * still being referenced.
 	 */
 	xfs_agino_t	agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
 } xfs_agi_t;

 #define	XFS_AGI_MAGICNUM	0x00000001
 #define	XFS_AGI_VERSIONNUM	0x00000002
 #define	XFS_AGI_SEQNO		0x00000004
 #define	XFS_AGI_LENGTH		0x00000008
 #define	XFS_AGI_COUNT		0x00000010
 #define	XFS_AGI_ROOT		0x00000020
 #define	XFS_AGI_LEVEL		0x00000040
 #define	XFS_AGI_FREECOUNT	0x00000080
 #define	XFS_AGI_NEWINO		0x00000100
 #define	XFS_AGI_DIRINO		0x00000200
 #define	XFS_AGI_UNLINKED	0x00000400
 #define	XFS_AGI_NUM_BITS	11
 #define	XFS_AGI_ALL_BITS	((1 << XFS_AGI_NUM_BITS) - 1)

 /* disk block (xfs_daddr_t) in the AG */
 #define XFS_AGI_DADDR(mp)	((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGI_BLOCK)
 xfs_agblock_t xfs_agi_block(struct xfs_mount *mp);
 #define	XFS_AGI_BLOCK(mp)	xfs_agi_block(mp)
 #else
 #define XFS_AGI_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
 #endif

 /*
  * The third a.g. block contains the a.g. freelist, an array
  * of block pointers to blocks owned by the allocation btree code.
  */
 #define XFS_AGFL_DADDR(mp)	((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGFL_BLOCK)
 xfs_agblock_t xfs_agfl_block(struct xfs_mount *mp);
 #define	XFS_AGFL_BLOCK(mp)	xfs_agfl_block(mp)
 #else
 #define XFS_AGFL_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
 #endif
 #define XFS_AGFL_SIZE(mp)	((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))

 typedef struct xfs_agfl {
 	xfs_agblock_t	agfl_bno[1];	/* actually XFS_AGFL_SIZE(mp) */
 } xfs_agfl_t;

 /*
  * Busy block/extent entry.  Used in perag to mark blocks that have been freed
  * but whose transactions aren't committed to disk yet.
  */
 typedef struct xfs_perag_busy {
 	xfs_agblock_t	busy_start;
 	xfs_extlen_t	busy_length;
 	struct xfs_trans *busy_tp;	/* transaction that did the free */
 } xfs_perag_busy_t;

 /*
  * Per-ag incore structure, copies of information in agf and agi,
  * to improve the performance of allocation group selection.
  *
  * pick sizes which fit in allocation buckets well
  */
 #if (BITS_PER_LONG == 32)
 #define XFS_PAGB_NUM_SLOTS	84
 #elif (BITS_PER_LONG == 64)
 #define XFS_PAGB_NUM_SLOTS	128
 #endif

 typedef struct xfs_perag
 {
 	char		pagf_init;	/* this agf's entry is initialized */
 	char		pagi_init;	/* this agi's entry is initialized */
 	char		pagf_metadata;	/* the agf is prefered to be metadata */
 	char		pagi_inodeok;	/* The agi is ok for inodes */
 	__uint8_t	pagf_levels[XFS_BTNUM_AGF];
 					/* # of levels in bno & cnt btree */
 	__uint32_t	pagf_flcount;	/* count of blocks in freelist */
 	xfs_extlen_t	pagf_freeblks;	/* total free blocks */
 	xfs_extlen_t	pagf_longest;	/* longest free space */
 	xfs_agino_t	pagi_freecount;	/* number of free inodes */
 #ifdef __KERNEL__
 	lock_t		pagb_lock;	/* lock for pagb_list */
 #endif
 	int		pagb_count;	/* pagb slots in use */
 	xfs_perag_busy_t *pagb_list;	/* unstable blocks */
 } xfs_perag_t;

 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_MAXLEVELS)
 int xfs_ag_maxlevels(struct xfs_mount *mp);
 #define	XFS_AG_MAXLEVELS(mp)		xfs_ag_maxlevels(mp)
 #else
 #define	XFS_AG_MAXLEVELS(mp)	((mp)->m_ag_maxlevels)
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST)
 int xfs_min_freelist(xfs_agf_t *a, struct xfs_mount *mp);
 #define	XFS_MIN_FREELIST(a,mp)		xfs_min_freelist(a,mp)
 #else
 #define	XFS_MIN_FREELIST(a,mp)	\
 	XFS_MIN_FREELIST_RAW(	\
 		INT_GET((a)->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT), \
 		INT_GET((a)->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT), mp)
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_PAG)
 int xfs_min_freelist_pag(xfs_perag_t *pag, struct xfs_mount *mp);
 #define	XFS_MIN_FREELIST_PAG(pag,mp)	xfs_min_freelist_pag(pag,mp)
 #else
 #define	XFS_MIN_FREELIST_PAG(pag,mp)	\
 	XFS_MIN_FREELIST_RAW((uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
 			     (uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_RAW)
 int xfs_min_freelist_raw(int bl, int cl, struct xfs_mount *mp);
 #define	XFS_MIN_FREELIST_RAW(bl,cl,mp)	xfs_min_freelist_raw(bl,cl,mp)
 #else
 #define	XFS_MIN_FREELIST_RAW(bl,cl,mp)	\
 	(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + \
 	 MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
 #endif

 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_FSB)
 xfs_fsblock_t xfs_agb_to_fsb(struct xfs_mount *mp, xfs_agnumber_t agno,
 			     xfs_agblock_t agbno);
 #define XFS_AGB_TO_FSB(mp,agno,agbno)	xfs_agb_to_fsb(mp,agno,agbno)
 #else
 #define	XFS_AGB_TO_FSB(mp,agno,agbno) \
 	(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGNO)
 xfs_agnumber_t xfs_fsb_to_agno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
 #define	XFS_FSB_TO_AGNO(mp,fsbno)	xfs_fsb_to_agno(mp,fsbno)
 #else
 #define	XFS_FSB_TO_AGNO(mp,fsbno) \
 	((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGBNO)
 xfs_agblock_t xfs_fsb_to_agbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
 #define	XFS_FSB_TO_AGBNO(mp,fsbno)	xfs_fsb_to_agbno(mp,fsbno)
 #else
 #define	XFS_FSB_TO_AGBNO(mp,fsbno) \
 	((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
 #endif

 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_DADDR)
 xfs_daddr_t xfs_agb_to_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
 				xfs_agblock_t agbno);
 #define	XFS_AGB_TO_DADDR(mp,agno,agbno)	xfs_agb_to_daddr(mp,agno,agbno)
 #else
 #define	XFS_AGB_TO_DADDR(mp,agno,agbno) \
 	((xfs_daddr_t)(XFS_FSB_TO_BB(mp, \
 		(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))))
 #endif
 /*
  * XFS_DADDR_TO_AGNO and XFS_DADDR_TO_AGBNO moved to xfs_mount.h
  * to avoid header file ordering change
  */

 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_DADDR)
 xfs_daddr_t xfs_ag_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
 				xfs_daddr_t d);
 #define	XFS_AG_DADDR(mp,agno,d)		xfs_ag_daddr(mp,agno,d)
 #else
 #define	XFS_AG_DADDR(mp,agno,d)	(XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
 #endif

 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGF)
 xfs_agf_t *xfs_buf_to_agf(struct xfs_buf *bp);
 #define	XFS_BUF_TO_AGF(bp)		xfs_buf_to_agf(bp)
 #else
 #define	XFS_BUF_TO_AGF(bp)	((xfs_agf_t *)XFS_BUF_PTR(bp))
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGI)
 xfs_agi_t *xfs_buf_to_agi(struct xfs_buf *bp);
 #define	XFS_BUF_TO_AGI(bp)		xfs_buf_to_agi(bp)
 #else
 #define	XFS_BUF_TO_AGI(bp)	((xfs_agi_t *)XFS_BUF_PTR(bp))
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGFL)
 xfs_agfl_t *xfs_buf_to_agfl(struct xfs_buf *bp);
 #define	XFS_BUF_TO_AGFL(bp)		xfs_buf_to_agfl(bp)
 #else
 #define	XFS_BUF_TO_AGFL(bp)	((xfs_agfl_t *)XFS_BUF_PTR(bp))
 #endif

 /*
  * For checking for bad ranges of xfs_daddr_t's, covering multiple
  * allocation groups or a single xfs_daddr_t that's a superblock copy.
  */
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AG_CHECK_DADDR)
 void xfs_ag_check_daddr(struct xfs_mount *mp, xfs_daddr_t d, xfs_extlen_t len);
 #define	XFS_AG_CHECK_DADDR(mp,d,len)	xfs_ag_check_daddr(mp,d,len)
 #else
 #define	XFS_AG_CHECK_DADDR(mp,d,len)	\
 	((len) == 1 ? \
 	    ASSERT((d) == XFS_SB_DADDR || \
 		   XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \
 	    ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \
 		   XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1)))
 #endif

 #endif	/* __XFS_AG_H__ */
	/*
	* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of version 2 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.
	*
	* Further, this software is distributed without any warranty that it is
	* free of the rightful claim of any third person regarding infringement
	* or the like. Any license provided herein, whether implied or
	* otherwise, applies only to this software file. Patent licenses, if
	* any, provided herein do not apply to combinations of this program with
	* other software, or any other product whatsoever.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write the Free Software Foundation, Inc., 59
	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	*
	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	* Mountain View, CA 94043, or:
	*
	* http://www.sgi.com
	*
	* For further information regarding this notice, see:
	*
	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	*/
	#ifndef __XFS_AG_H__
	#define __XFS_AG_H__

	/*
	* Allocation group header
	* This is divided into three structures, placed in sequential 512-byte
	* buffers after a copy of the superblock (also in a 512-byte buffer).
	*/

	struct xfs_buf;
	struct xfs_mount;
	struct xfs_trans;

	#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
	#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
	#define XFS_AGF_VERSION 1
	#define XFS_AGI_VERSION 1
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGF_GOOD_VERSION)
	int xfs_agf_good_version(unsigned v);
	#define XFS_AGF_GOOD_VERSION(v) xfs_agf_good_version(v)
	#else
	#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGI_GOOD_VERSION)
	int xfs_agi_good_version(unsigned v);
	#define XFS_AGI_GOOD_VERSION(v) xfs_agi_good_version(v)
	#else
	#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
	#endif

	/*
	* Btree number 0 is bno, 1 is cnt. This value gives the size of the
	* arrays below.
	*/
	#define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1)

	/*
	* The second word of agf_levels in the first a.g. overlaps the EFS
	* superblock's magic number. Since the magic numbers valid for EFS
	* are > 64k, our value cannot be confused for an EFS superblock's.
	*/

	typedef struct xfs_agf
	{
	/*
	* Common allocation group header information
	*/
	__uint32_t agf_magicnum; /* magic number == XFS_AGF_MAGIC */
	__uint32_t agf_versionnum; /* header version == XFS_AGF_VERSION */
	xfs_agnumber_t agf_seqno; /* sequence # starting from 0 */
	xfs_agblock_t agf_length; /* size in blocks of a.g. */
	/*
	* Freespace information
	*/
	xfs_agblock_t agf_roots[XFS_BTNUM_AGF]; /* root blocks */
	__uint32_t agf_spare0; /* spare field */
	__uint32_t agf_levels[XFS_BTNUM_AGF]; /* btree levels */
	__uint32_t agf_spare1; /* spare field */
	__uint32_t agf_flfirst; /* first freelist block's index */
	__uint32_t agf_fllast; /* last freelist block's index */
	__uint32_t agf_flcount; /* count of blocks in freelist */
	xfs_extlen_t agf_freeblks; /* total free blocks */
	xfs_extlen_t agf_longest; /* longest free space */
	} xfs_agf_t;

	#define XFS_AGF_MAGICNUM 0x00000001
	#define XFS_AGF_VERSIONNUM 0x00000002
	#define XFS_AGF_SEQNO 0x00000004
	#define XFS_AGF_LENGTH 0x00000008
	#define XFS_AGF_ROOTS 0x00000010
	#define XFS_AGF_LEVELS 0x00000020
	#define XFS_AGF_FLFIRST 0x00000040
	#define XFS_AGF_FLLAST 0x00000080
	#define XFS_AGF_FLCOUNT 0x00000100
	#define XFS_AGF_FREEBLKS 0x00000200
	#define XFS_AGF_LONGEST 0x00000400
	#define XFS_AGF_NUM_BITS 11
	#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)

	/* disk block (xfs_daddr_t) in the AG */
	#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGF_BLOCK)
	xfs_agblock_t xfs_agf_block(struct xfs_mount *mp);
	#define XFS_AGF_BLOCK(mp) xfs_agf_block(mp)
	#else
	#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
	#endif

	/*
	* Size of the unlinked inode hash table in the agi.
	*/
	#define XFS_AGI_UNLINKED_BUCKETS 64

	typedef struct xfs_agi
	{
	/*
	* Common allocation group header information
	*/
	__uint32_t agi_magicnum; /* magic number == XFS_AGI_MAGIC */
	__uint32_t agi_versionnum; /* header version == XFS_AGI_VERSION */
	xfs_agnumber_t agi_seqno; /* sequence # starting from 0 */
	xfs_agblock_t agi_length; /* size in blocks of a.g. */
	/*
	* Inode information
	* Inodes are mapped by interpreting the inode number, so no
	* mapping data is needed here.
	*/
	xfs_agino_t agi_count; /* count of allocated inodes */
	xfs_agblock_t agi_root; /* root of inode btree */
	__uint32_t agi_level; /* levels in inode btree */
	xfs_agino_t agi_freecount; /* number of free inodes */
	xfs_agino_t agi_newino; /* new inode just allocated */
	xfs_agino_t agi_dirino; /* last directory inode chunk */
	/*
	* Hash table of inodes which have been unlinked but are
	* still being referenced.
	*/
	xfs_agino_t agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
	} xfs_agi_t;

	#define XFS_AGI_MAGICNUM 0x00000001
	#define XFS_AGI_VERSIONNUM 0x00000002
	#define XFS_AGI_SEQNO 0x00000004
	#define XFS_AGI_LENGTH 0x00000008
	#define XFS_AGI_COUNT 0x00000010
	#define XFS_AGI_ROOT 0x00000020
	#define XFS_AGI_LEVEL 0x00000040
	#define XFS_AGI_FREECOUNT 0x00000080
	#define XFS_AGI_NEWINO 0x00000100
	#define XFS_AGI_DIRINO 0x00000200
	#define XFS_AGI_UNLINKED 0x00000400
	#define XFS_AGI_NUM_BITS 11
	#define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1)

	/* disk block (xfs_daddr_t) in the AG */
	#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGI_BLOCK)
	xfs_agblock_t xfs_agi_block(struct xfs_mount *mp);
	#define XFS_AGI_BLOCK(mp) xfs_agi_block(mp)
	#else
	#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
	#endif

	/*
	* The third a.g. block contains the a.g. freelist, an array
	* of block pointers to blocks owned by the allocation btree code.
	*/
	#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGFL_BLOCK)
	xfs_agblock_t xfs_agfl_block(struct xfs_mount *mp);
	#define XFS_AGFL_BLOCK(mp) xfs_agfl_block(mp)
	#else
	#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
	#endif
	#define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t))

	typedef struct xfs_agfl {
	xfs_agblock_t agfl_bno[1]; /* actually XFS_AGFL_SIZE(mp) */
	} xfs_agfl_t;

	/*
	* Busy block/extent entry. Used in perag to mark blocks that have been freed
	* but whose transactions aren't committed to disk yet.
	*/
	typedef struct xfs_perag_busy {
	xfs_agblock_t busy_start;
	xfs_extlen_t busy_length;
	struct xfs_trans busy_tp; / transaction that did the free */
	} xfs_perag_busy_t;

	/*
	* Per-ag incore structure, copies of information in agf and agi,
	* to improve the performance of allocation group selection.
	*
	* pick sizes which fit in allocation buckets well
	*/
	#if (BITS_PER_LONG == 32)
	#define XFS_PAGB_NUM_SLOTS 84
	#elif (BITS_PER_LONG == 64)
	#define XFS_PAGB_NUM_SLOTS 128
	#endif

	typedef struct xfs_perag
	{
	char pagf_init; /* this agf's entry is initialized */
	char pagi_init; /* this agi's entry is initialized */
	char pagf_metadata; /* the agf is prefered to be metadata */
	char pagi_inodeok; /* The agi is ok for inodes */
	__uint8_t pagf_levels[XFS_BTNUM_AGF];
	/* # of levels in bno & cnt btree */
	__uint32_t pagf_flcount; /* count of blocks in freelist */
	xfs_extlen_t pagf_freeblks; /* total free blocks */
	xfs_extlen_t pagf_longest; /* longest free space */
	xfs_agino_t pagi_freecount; /* number of free inodes */
	#ifdef __KERNEL__
	lock_t pagb_lock; /* lock for pagb_list */
	#endif
	int pagb_count; /* pagb slots in use */
	xfs_perag_busy_t pagb_list; / unstable blocks */
	} xfs_perag_t;

	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AG_MAXLEVELS)
	int xfs_ag_maxlevels(struct xfs_mount *mp);
	#define XFS_AG_MAXLEVELS(mp) xfs_ag_maxlevels(mp)
	#else
	#define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels)
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST)
	int xfs_min_freelist(xfs_agf_t a, struct xfs_mount mp);
	#define XFS_MIN_FREELIST(a,mp) xfs_min_freelist(a,mp)
	#else
	#define XFS_MIN_FREELIST(a,mp) \
	XFS_MIN_FREELIST_RAW( \
	INT_GET((a)->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT), \
	INT_GET((a)->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT), mp)
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_PAG)
	int xfs_min_freelist_pag(xfs_perag_t pag, struct xfs_mount mp);
	#define XFS_MIN_FREELIST_PAG(pag,mp) xfs_min_freelist_pag(pag,mp)
	#else
	#define XFS_MIN_FREELIST_PAG(pag,mp) \
	XFS_MIN_FREELIST_RAW((uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \
	(uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_MIN_FREELIST_RAW)
	int xfs_min_freelist_raw(int bl, int cl, struct xfs_mount *mp);
	#define XFS_MIN_FREELIST_RAW(bl,cl,mp) xfs_min_freelist_raw(bl,cl,mp)
	#else
	#define XFS_MIN_FREELIST_RAW(bl,cl,mp) \
	(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + \
	MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))
	#endif

	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_FSB)
	xfs_fsblock_t xfs_agb_to_fsb(struct xfs_mount *mp, xfs_agnumber_t agno,
	xfs_agblock_t agbno);
	#define XFS_AGB_TO_FSB(mp,agno,agbno) xfs_agb_to_fsb(mp,agno,agbno)
	#else
	#define XFS_AGB_TO_FSB(mp,agno,agbno) \
	(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) \| (agbno))
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGNO)
	xfs_agnumber_t xfs_fsb_to_agno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
	#define XFS_FSB_TO_AGNO(mp,fsbno) xfs_fsb_to_agno(mp,fsbno)
	#else
	#define XFS_FSB_TO_AGNO(mp,fsbno) \
	((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_AGBNO)
	xfs_agblock_t xfs_fsb_to_agbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
	#define XFS_FSB_TO_AGBNO(mp,fsbno) xfs_fsb_to_agbno(mp,fsbno)
	#else
	#define XFS_FSB_TO_AGBNO(mp,fsbno) \
	((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog)))
	#endif

	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AGB_TO_DADDR)
	xfs_daddr_t xfs_agb_to_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
	xfs_agblock_t agbno);
	#define XFS_AGB_TO_DADDR(mp,agno,agbno) xfs_agb_to_daddr(mp,agno,agbno)
	#else
	#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
	((xfs_daddr_t)(XFS_FSB_TO_BB(mp, \
	(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))))
	#endif
	/*
	* XFS_DADDR_TO_AGNO and XFS_DADDR_TO_AGBNO moved to xfs_mount.h
	* to avoid header file ordering change
	*/

	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AG_DADDR)
	xfs_daddr_t xfs_ag_daddr(struct xfs_mount *mp, xfs_agnumber_t agno,
	xfs_daddr_t d);
	#define XFS_AG_DADDR(mp,agno,d) xfs_ag_daddr(mp,agno,d)
	#else
	#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
	#endif

	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGF)
	xfs_agf_t xfs_buf_to_agf(struct xfs_buf bp);
	#define XFS_BUF_TO_AGF(bp) xfs_buf_to_agf(bp)
	#else
	#define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)XFS_BUF_PTR(bp))
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGI)
	xfs_agi_t xfs_buf_to_agi(struct xfs_buf bp);
	#define XFS_BUF_TO_AGI(bp) xfs_buf_to_agi(bp)
	#else
	#define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)XFS_BUF_PTR(bp))
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_AGFL)
	xfs_agfl_t xfs_buf_to_agfl(struct xfs_buf bp);
	#define XFS_BUF_TO_AGFL(bp) xfs_buf_to_agfl(bp)
	#else
	#define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp))
	#endif

	/*
	* For checking for bad ranges of xfs_daddr_t's, covering multiple
	* allocation groups or a single xfs_daddr_t that's a superblock copy.
	*/
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_AG_CHECK_DADDR)
	void xfs_ag_check_daddr(struct xfs_mount *mp, xfs_daddr_t d, xfs_extlen_t len);
	#define XFS_AG_CHECK_DADDR(mp,d,len) xfs_ag_check_daddr(mp,d,len)
	#else
	#define XFS_AG_CHECK_DADDR(mp,d,len) \
	((len) == 1 ? \
	ASSERT((d) == XFS_SB_DADDR \|\| \
	XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \
	ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \
	XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1)))
	#endif

	#endif /* __XFS_AG_H__ */