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Commit 4fb6e8ad authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Dave Chinner
Browse files

xfs: merge xfs_ag.h into xfs_format.h 



More on-disk format consolidation.  A few declarations that weren't on-disk
format related move into better suitable spots.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 5beda58b

fs/xfs/libxfs/xfs_ag.h

deleted100644 → 0
+0 −281
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2000-2003,2005 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_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_AGFL_MAGIC	0x5841464c	/* 'XAFL' */

#define	XFS_AGF_VERSION	1

#define	XFS_AGI_VERSION	1



#define	XFS_AGF_GOOD_VERSION(v)	((v) == XFS_AGF_VERSION)

#define	XFS_AGI_GOOD_VERSION(v)	((v) == XFS_AGI_VERSION)



/*

 * 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

	 */

	__be32		agf_magicnum;	/* magic number == XFS_AGF_MAGIC */

	__be32		agf_versionnum;	/* header version == XFS_AGF_VERSION */

	__be32		agf_seqno;	/* sequence # starting from 0 */

	__be32		agf_length;	/* size in blocks of a.g. */

	/*

	 * Freespace information

	 */

	__be32		agf_roots[XFS_BTNUM_AGF];	/* root blocks */

	__be32		agf_spare0;	/* spare field */

	__be32		agf_levels[XFS_BTNUM_AGF];	/* btree levels */

	__be32		agf_spare1;	/* spare field */



	__be32		agf_flfirst;	/* first freelist block's index */

	__be32		agf_fllast;	/* last freelist block's index */

	__be32		agf_flcount;	/* count of blocks in freelist */

	__be32		agf_freeblks;	/* total free blocks */



	__be32		agf_longest;	/* longest free space */

	__be32		agf_btreeblks;	/* # of blocks held in AGF btrees */

	uuid_t		agf_uuid;	/* uuid of filesystem */



	/*

	 * reserve some contiguous space for future logged fields before we add

	 * the unlogged fields. This makes the range logging via flags and

	 * structure offsets much simpler.

	 */

	__be64		agf_spare64[16];



	/* unlogged fields, written during buffer writeback. */

	__be64		agf_lsn;	/* last write sequence */

	__be32		agf_crc;	/* crc of agf sector */

	__be32		agf_spare2;



	/* structure must be padded to 64 bit alignment */

} xfs_agf_t;



#define XFS_AGF_CRC_OFF		offsetof(struct xfs_agf, agf_crc)



#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_BTREEBLKS	0x00000800

#define	XFS_AGF_UUID		0x00001000

#define	XFS_AGF_NUM_BITS	13

#define	XFS_AGF_ALL_BITS	((1 << XFS_AGF_NUM_BITS) - 1)



#define XFS_AGF_FLAGS \

	{ XFS_AGF_MAGICNUM,	"MAGICNUM" }, \

	{ XFS_AGF_VERSIONNUM,	"VERSIONNUM" }, \

	{ XFS_AGF_SEQNO,	"SEQNO" }, \

	{ XFS_AGF_LENGTH,	"LENGTH" }, \

	{ XFS_AGF_ROOTS,	"ROOTS" }, \

	{ XFS_AGF_LEVELS,	"LEVELS" }, \

	{ XFS_AGF_FLFIRST,	"FLFIRST" }, \

	{ XFS_AGF_FLLAST,	"FLLAST" }, \

	{ XFS_AGF_FLCOUNT,	"FLCOUNT" }, \

	{ XFS_AGF_FREEBLKS,	"FREEBLKS" }, \

	{ XFS_AGF_LONGEST,	"LONGEST" }, \

	{ XFS_AGF_BTREEBLKS,	"BTREEBLKS" }, \

	{ XFS_AGF_UUID,		"UUID" }



/* disk block (xfs_daddr_t) in the AG */

#define XFS_AGF_DADDR(mp)	((xfs_daddr_t)(1 << (mp)->m_sectbb_log))

#define	XFS_AGF_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))

#define	XFS_BUF_TO_AGF(bp)	((xfs_agf_t *)((bp)->b_addr))



extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,

			xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);



/*

 * 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

	 */

	__be32		agi_magicnum;	/* magic number == XFS_AGI_MAGIC */

	__be32		agi_versionnum;	/* header version == XFS_AGI_VERSION */

	__be32		agi_seqno;	/* sequence # starting from 0 */

	__be32		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.

	 */

	__be32		agi_count;	/* count of allocated inodes */

	__be32		agi_root;	/* root of inode btree */

	__be32		agi_level;	/* levels in inode btree */

	__be32		agi_freecount;	/* number of free inodes */



	__be32		agi_newino;	/* new inode just allocated */

	__be32		agi_dirino;	/* last directory inode chunk */

	/*

	 * Hash table of inodes which have been unlinked but are

	 * still being referenced.

	 */

	__be32		agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];

	/*

	 * This marks the end of logging region 1 and start of logging region 2.

	 */

	uuid_t		agi_uuid;	/* uuid of filesystem */

	__be32		agi_crc;	/* crc of agi sector */

	__be32		agi_pad32;

	__be64		agi_lsn;	/* last write sequence */



	__be32		agi_free_root; /* root of the free inode btree */

	__be32		agi_free_level;/* levels in free inode btree */



	/* structure must be padded to 64 bit alignment */

} xfs_agi_t;



#define XFS_AGI_CRC_OFF		offsetof(struct xfs_agi, agi_crc)



#define	XFS_AGI_MAGICNUM	(1 << 0)

#define	XFS_AGI_VERSIONNUM	(1 << 1)

#define	XFS_AGI_SEQNO		(1 << 2)

#define	XFS_AGI_LENGTH		(1 << 3)

#define	XFS_AGI_COUNT		(1 << 4)

#define	XFS_AGI_ROOT		(1 << 5)

#define	XFS_AGI_LEVEL		(1 << 6)

#define	XFS_AGI_FREECOUNT	(1 << 7)

#define	XFS_AGI_NEWINO		(1 << 8)

#define	XFS_AGI_DIRINO		(1 << 9)

#define	XFS_AGI_UNLINKED	(1 << 10)

#define	XFS_AGI_NUM_BITS_R1	11	/* end of the 1st agi logging region */

#define	XFS_AGI_ALL_BITS_R1	((1 << XFS_AGI_NUM_BITS_R1) - 1)

#define	XFS_AGI_FREE_ROOT	(1 << 11)

#define	XFS_AGI_FREE_LEVEL	(1 << 12)

#define	XFS_AGI_NUM_BITS_R2	13



/* disk block (xfs_daddr_t) in the AG */

#define XFS_AGI_DADDR(mp)	((xfs_daddr_t)(2 << (mp)->m_sectbb_log))

#define	XFS_AGI_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))

#define	XFS_BUF_TO_AGI(bp)	((xfs_agi_t *)((bp)->b_addr))



extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,

				xfs_agnumber_t agno, struct xfs_buf **bpp);



/*

 * 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))

#define	XFS_AGFL_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))

#define	XFS_BUF_TO_AGFL(bp)	((xfs_agfl_t *)((bp)->b_addr))



#define XFS_BUF_TO_AGFL_BNO(mp, bp) \

	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \

		&(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \

		(__be32 *)(bp)->b_addr)



/*

 * Size of the AGFL.  For CRC-enabled filesystes we steal a couple of

 * slots in the beginning of the block for a proper header with the

 * location information and CRC.

 */

#define XFS_AGFL_SIZE(mp) \

	(((mp)->m_sb.sb_sectsize - \

	 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \

		sizeof(struct xfs_agfl) : 0)) / \

	  sizeof(xfs_agblock_t))



typedef struct xfs_agfl {

	__be32		agfl_magicnum;

	__be32		agfl_seqno;

	uuid_t		agfl_uuid;

	__be64		agfl_lsn;

	__be32		agfl_crc;

	__be32		agfl_bno[];	/* actually XFS_AGFL_SIZE(mp) */

} xfs_agfl_t;



#define XFS_AGFL_CRC_OFF	offsetof(struct xfs_agfl, agfl_crc)



/*

 * tags for inode radix tree

 */

#define XFS_ICI_NO_TAG		(-1)	/* special flag for an untagged lookup

					   in xfs_inode_ag_iterator */

#define XFS_ICI_RECLAIM_TAG	0	/* inode is to be reclaimed */

#define XFS_ICI_EOFBLOCKS_TAG	1	/* inode has blocks beyond EOF */



#define	XFS_AG_MAXLEVELS(mp)		((mp)->m_ag_maxlevels)

#define	XFS_MIN_FREELIST_RAW(bl,cl,mp)	\

	(MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp)))

#define	XFS_MIN_FREELIST(a,mp)		\

	(XFS_MIN_FREELIST_RAW(		\

		be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \

		be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp))

#define	XFS_MIN_FREELIST_PAG(pag,mp)	\

	(XFS_MIN_FREELIST_RAW(		\

		(unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \

		(unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp))



#define XFS_AGB_TO_FSB(mp,agno,agbno)	\

	(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))

#define	XFS_FSB_TO_AGNO(mp,fsbno)	\

	((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))

#define	XFS_FSB_TO_AGBNO(mp,fsbno)	\

	((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))

#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)))

#define	XFS_AG_DADDR(mp,agno,d)		(XFS_AGB_TO_DADDR(mp, agno, 0) + (d))



/*

 * 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.

 */

#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	/* __XFS_AG_H__ */

fs/xfs/libxfs/xfs_alloc.c

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@@ -23,7 +23,6 @@ 
#include "xfs_trans_resv.h"

#include "xfs_bit.h"

#include "xfs_sb.h"

#include "xfs_ag.h"

#include "xfs_mount.h"

#include "xfs_inode.h"

#include "xfs_btree.h"

fs/xfs/libxfs/xfs_alloc.h

+3 −0
Original line number Diff line number Diff line
@@ -231,4 +231,7 @@ xfs_alloc_get_rec( 
	xfs_extlen_t		*len,	/* output: length of extent */

	int			*stat);	/* output: success/failure */



int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,

			xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);



#endif	/* __XFS_ALLOC_H__ */

fs/xfs/libxfs/xfs_alloc_btree.c

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@@ -22,7 +22,6 @@ 
#include "xfs_log_format.h"

#include "xfs_trans_resv.h"

#include "xfs_sb.h"

#include "xfs_ag.h"

#include "xfs_mount.h"

#include "xfs_btree.h"

#include "xfs_alloc_btree.h"

fs/xfs/libxfs/xfs_attr.c

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@@ -23,7 +23,6 @@ 
#include "xfs_trans_resv.h"

#include "xfs_bit.h"

#include "xfs_sb.h"

#include "xfs_ag.h"

#include "xfs_mount.h"

#include "xfs_da_format.h"

#include "xfs_da_btree.h"