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linux/fs/xfs/xfs_ag.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

346 lines
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/*
* 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__ */
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