128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
|
|
* 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_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;
|
|
|
|
/*
|
|
* 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))
|
|
|
|
/*
|
|
* 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))
|
|
|
|
/*
|
|
* Btree block header size depends on a superblock flag.
|
|
*
|
|
* (not quite yet, but soon)
|
|
*/
|
|
#define XFS_INOBT_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN
|
|
|
|
/*
|
|
* Record, key, and pointer address macros for btree blocks.
|
|
*
|
|
* (note that some of these may appear unused, but they are used in userspace)
|
|
*/
|
|
#define XFS_INOBT_REC_ADDR(mp, block, index) \
|
|
((xfs_inobt_rec_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
(((index) - 1) * sizeof(xfs_inobt_rec_t))))
|
|
|
|
#define XFS_INOBT_KEY_ADDR(mp, block, index) \
|
|
((xfs_inobt_key_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
((index) - 1) * sizeof(xfs_inobt_key_t)))
|
|
|
|
#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
|
|
((xfs_inobt_ptr_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
(maxrecs) * sizeof(xfs_inobt_key_t) + \
|
|
((index) - 1) * sizeof(xfs_inobt_ptr_t)))
|
|
|
|
extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
|
|
struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
|
|
extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
|
|
|
|
#endif /* __XFS_IALLOC_BTREE_H__ */
|