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xfs_ialloc_btree.h
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xfs_ialloc_btree.h
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/*
* 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_btree_sblock;
struct xfs_mount;
/*
* There is a btree for the inode map per allocation group.
*/
#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
typedef __uint64_t xfs_inofree_t;
#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
#define XFS_INOBT_MASKN(i,n) xfs_inobt_maskn(i,n)
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
return (((n) >= XFS_INODES_PER_CHUNK ? \
(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
}
/*
* Data record structure
*/
typedef struct xfs_inobt_rec {
__be32 ir_startino; /* starting inode number */
__be32 ir_freecount; /* count of free inodes (set bits) */
__be64 ir_free; /* free inode mask */
} xfs_inobt_rec_t;
typedef struct xfs_inobt_rec_incore {
xfs_agino_t ir_startino; /* starting inode number */
__int32_t ir_freecount; /* count of free inodes (set bits) */
xfs_inofree_t ir_free; /* free inode mask */
} xfs_inobt_rec_incore_t;
/*
* Key structure
*/
typedef struct xfs_inobt_key {
__be32 ir_startino; /* starting inode number */
} xfs_inobt_key_t;
/* btree pointer type */
typedef __be32 xfs_inobt_ptr_t;
/* btree block header type */
typedef struct xfs_btree_sblock xfs_inobt_block_t;
#define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp))
/*
* Bit manipulations for ir_free.
*/
#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
#define XFS_INOBT_IS_FREE(rp,i) \
(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
#define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i))
#define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
/*
* Real block structures have a size equal to the disk block size.
*/
#define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
#define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
#define XFS_INOBT_IS_LAST_REC(cur) \
((cur)->bc_ptrs[0] == be16_to_cpu(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs))
/*
* Maximum number of inode btree levels.
*/
#define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
/*
* block numbers in the AG.
*/
#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
/*
* Record, key, and pointer address macros for btree blocks.
*/
#define XFS_INOBT_REC_ADDR(bb,i,cur) \
(XFS_BTREE_REC_ADDR(xfs_inobt, bb, i))
#define XFS_INOBT_KEY_ADDR(bb,i,cur) \
(XFS_BTREE_KEY_ADDR(xfs_inobt, bb, i))
#define XFS_INOBT_PTR_ADDR(bb,i,cur) \
(XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
/*
* Decrement cursor by one record at the level.
* For nonzero levels the leaf-ward information is untouched.
*/
extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat);
/*
* Delete the record pointed to by cur.
* The cursor refers to the place where the record was (could be inserted)
* when the operation returns.
*/
extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);
/*
* Get the data from the pointed-to record.
*/
extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
__int32_t *fcnt, xfs_inofree_t *free, int *stat);
/*
* Increment cursor by one record at the level.
* For nonzero levels the leaf-ward information is untouched.
*/
extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat);
/*
* Insert the current record at the point referenced by cur.
* The cursor may be inconsistent on return if splits have been done.
*/
extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat);
/*
* Lookup the record equal to ino in the btree given by cur.
*/
extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino,
__int32_t fcnt, xfs_inofree_t free, int *stat);
/*
* Lookup the first record greater than or equal to ino
* in the btree given by cur.
*/
extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
__int32_t fcnt, xfs_inofree_t free, int *stat);
/*
* Lookup the first record less than or equal to ino
* in the btree given by cur.
*/
extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
__int32_t fcnt, xfs_inofree_t free, int *stat);
/*
* Update the record referred to by cur, to the value given
* by [ino, fcnt, free].
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino,
__int32_t fcnt, xfs_inofree_t free);
#endif /* __XFS_IALLOC_BTREE_H__ */