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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_IALLOC_BTREE_H__
19#define __XFS_IALLOC_BTREE_H__
20
21/*
22 * Inode map on-disk structures
23 */
24
25struct xfs_buf;
26struct xfs_btree_cur;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027struct xfs_mount;
28
29/*
30 * There is a btree for the inode map per allocation group.
31 */
32#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
33
34typedef __uint64_t xfs_inofree_t;
Christoph Hellwig0d87e652009-02-09 08:37:14 +010035#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
Christoph Hellwig0d87e652009-02-09 08:37:14 +010037#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
38#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Nathan Scotta844f452005-11-02 14:38:42 +110040static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
41{
Christoph Hellwig0d87e652009-02-09 08:37:14 +010042 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
Nathan Scotta844f452005-11-02 14:38:42 +110043}
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/*
46 * Data record structure
47 */
Christoph Hellwig61a25842006-09-28 10:57:04 +100048typedef struct xfs_inobt_rec {
49 __be32 ir_startino; /* starting inode number */
50 __be32 ir_freecount; /* count of free inodes (set bits) */
51 __be64 ir_free; /* free inode mask */
52} xfs_inobt_rec_t;
53
54typedef struct xfs_inobt_rec_incore {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 xfs_agino_t ir_startino; /* starting inode number */
56 __int32_t ir_freecount; /* count of free inodes (set bits) */
57 xfs_inofree_t ir_free; /* free inode mask */
Christoph Hellwig61a25842006-09-28 10:57:04 +100058} xfs_inobt_rec_incore_t;
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61/*
62 * Key structure
63 */
Christoph Hellwig61a25842006-09-28 10:57:04 +100064typedef struct xfs_inobt_key {
65 __be32 ir_startino; /* starting inode number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070066} xfs_inobt_key_t;
67
Christoph Hellwig16259e72005-11-02 15:11:25 +110068/* btree pointer type */
69typedef __be32 xfs_inobt_ptr_t;
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 * block numbers in the AG.
73 */
Nathan Scotta844f452005-11-02 14:38:42 +110074#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
75#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77/*
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110078 * Btree block header size depends on a superblock flag.
79 *
80 * (not quite yet, but soon)
81 */
82#define XFS_INOBT_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN
83
84/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 * Record, key, and pointer address macros for btree blocks.
Christoph Hellwig136341b2008-10-30 17:11:40 +110086 *
87 * (note that some of these may appear unused, but they are used in userspace)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 */
Christoph Hellwig136341b2008-10-30 17:11:40 +110089#define XFS_INOBT_REC_ADDR(mp, block, index) \
90 ((xfs_inobt_rec_t *) \
91 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110092 XFS_INOBT_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +110093 (((index) - 1) * sizeof(xfs_inobt_rec_t))))
Eric Sandeen2c36dde2007-02-10 18:37:33 +110094
Christoph Hellwig136341b2008-10-30 17:11:40 +110095#define XFS_INOBT_KEY_ADDR(mp, block, index) \
96 ((xfs_inobt_key_t *) \
97 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110098 XFS_INOBT_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +110099 ((index) - 1) * sizeof(xfs_inobt_key_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Christoph Hellwig136341b2008-10-30 17:11:40 +1100101#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
102 ((xfs_inobt_ptr_t *) \
103 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100104 XFS_INOBT_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +1100105 (maxrecs) * sizeof(xfs_inobt_key_t) + \
106 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100108extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
109 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100110extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100111
Dave Chinner1813dd62012-11-14 17:54:40 +1100112extern const struct xfs_buf_ops xfs_inobt_buf_ops;
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#endif /* __XFS_IALLOC_BTREE_H__ */