Linux-2.6.33.2/fs/xfs/xfs_bmap_btree.h
/*
* Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
#define __XFS_BMAP_BTREE_H__
#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
struct xfs_btree_cur;
struct xfs_btree_block;
struct xfs_mount;
struct xfs_inode;
struct xfs_trans;
/*
* Bmap root header, on-disk form only.
*/
typedef struct xfs_bmdr_block {
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
} xfs_bmdr_block_t;
/*
* Bmap btree record and extent descriptor.
* l0:63 is an extent flag (value 1 indicates non-normal).
* l0:9-62 are startoff.
* l0:0-8 and l1:21-63 are startblock.
* l1:0-20 are blockcount.
*/
#define BMBT_EXNTFLAG_BITLEN 1
#define BMBT_STARTOFF_BITLEN 54
#define BMBT_STARTBLOCK_BITLEN 52
#define BMBT_BLOCKCOUNT_BITLEN 21
typedef struct xfs_bmbt_rec {
__be64 l0, l1;
} xfs_bmbt_rec_t;
typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
typedef struct xfs_bmbt_rec_host {
__uint64_t l0, l1;
} xfs_bmbt_rec_host_t;
/*
* Values and macros for delayed-allocation startblock fields.
*/
#define STARTBLOCKVALBITS 17
#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
#define DSTARTBLOCKMASKBITS (15 + 20)
#define STARTBLOCKMASK \
(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
#define DSTARTBLOCKMASK \
(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
static inline int isnullstartblock(xfs_fsblock_t x)
{
return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
}
static inline int isnulldstartblock(xfs_dfsbno_t x)
{
return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
}
static inline xfs_fsblock_t nullstartblock(int k)
{
ASSERT(k < (1 << STARTBLOCKVALBITS));
return STARTBLOCKMASK | (k);
}
static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
{
return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
}
/*
* Possible extent formats.
*/
typedef enum {
XFS_EXTFMT_NOSTATE = 0,
XFS_EXTFMT_HASSTATE
} xfs_exntfmt_t;
/*
* Possible extent states.
*/
typedef enum {
XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
} xfs_exntst_t;
/*
* Extent state and extent format macros.
*/
#define XFS_EXTFMT_INODE(x) \
(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
/*
* Incore version of above.
*/
typedef struct xfs_bmbt_irec
{
xfs_fileoff_t br_startoff; /* starting file offset */
xfs_fsblock_t br_startblock; /* starting block number */
xfs_filblks_t br_blockcount; /* number of blocks */
xfs_exntst_t br_state; /* extent state */
} xfs_bmbt_irec_t;
/*
* Key structure for non-leaf levels of the tree.
*/
typedef struct xfs_bmbt_key {
__be64 br_startoff; /* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;
/* btree pointer type */
typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
/*
* Btree block header size depends on a superblock flag.
*
* (not quite yet, but soon)
*/
#define XFS_BMBT_BLOCK_LEN(mp) XFS_BTREE_LBLOCK_LEN
#define XFS_BMBT_REC_ADDR(mp, block, index) \
((xfs_bmbt_rec_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
((index) - 1) * sizeof(xfs_bmbt_rec_t)))
#define XFS_BMBT_KEY_ADDR(mp, block, index) \
((xfs_bmbt_key_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
((index) - 1) * sizeof(xfs_bmbt_key_t)))
#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
((xfs_bmbt_ptr_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
(maxrecs) * sizeof(xfs_bmbt_key_t) + \
((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
#define XFS_BMDR_REC_ADDR(block, index) \
((xfs_bmdr_rec_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
((index) - 1) * sizeof(xfs_bmdr_rec_t)))
#define XFS_BMDR_KEY_ADDR(block, index) \
((xfs_bmdr_key_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
((index) - 1) * sizeof(xfs_bmdr_key_t)))
#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
((xfs_bmdr_ptr_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
(maxrecs) * sizeof(xfs_bmdr_key_t) + \
((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
/*
* These are to be used when we know the size of the block and
* we don't have a cursor.
*/
#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
(int)(XFS_BTREE_LBLOCK_LEN + \
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
#define XFS_BMAP_BROOT_SPACE(bb) \
(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
#define XFS_BMDR_SPACE_CALC(nrecs) \
(int)(sizeof(xfs_bmdr_block_t) + \
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
/*
* Maximum number of bmap btree levels.
*/
#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
/*
* Prototypes for xfs_bmap.c to call.
*/
extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
struct xfs_btree_block *, int);
extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
xfs_bmdr_block_t *, int);
extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
struct xfs_trans *, struct xfs_inode *, int);
#endif /* __XFS_BMAP_BTREE_H__ */