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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_ALLOC_BTREE_H__
19#define __XFS_ALLOC_BTREE_H__
20
21/*
22 * Freespace 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 are two on-disk btrees, one sorted by blockno and one sorted
31 * by blockcount and blockno. All blocks look the same to make the code
32 * simpler; if we have time later, we'll make the optimizations.
33 */
Christoph Hellwigee1a47a2013-04-21 14:53:46 -050034#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
35#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
36#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
37#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/*
40 * Data record/key structure
41 */
Christoph Hellwig16259e72005-11-02 15:11:25 +110042typedef struct xfs_alloc_rec {
43 __be32 ar_startblock; /* starting block number */
44 __be32 ar_blockcount; /* count of free blocks */
Linus Torvalds1da177e2005-04-16 15:20:36 -070045} xfs_alloc_rec_t, xfs_alloc_key_t;
46
Christoph Hellwig16259e72005-11-02 15:11:25 +110047typedef struct xfs_alloc_rec_incore {
48 xfs_agblock_t ar_startblock; /* starting block number */
49 xfs_extlen_t ar_blockcount; /* count of free blocks */
50} xfs_alloc_rec_incore_t;
51
52/* btree pointer type */
53typedef __be32 xfs_alloc_ptr_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 * Block numbers in the AG:
57 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
58 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62/*
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110063 * Btree block header size depends on a superblock flag.
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110064 */
Christoph Hellwigee1a47a2013-04-21 14:53:46 -050065#define XFS_ALLOC_BLOCK_LEN(mp) \
66 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
67 XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110068
69/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 * Record, key, and pointer address macros for btree blocks.
Christoph Hellwig136341b2008-10-30 17:11:40 +110071 *
72 * (note that some of these may appear unused, but they are used in userspace)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 */
Christoph Hellwig136341b2008-10-30 17:11:40 +110074#define XFS_ALLOC_REC_ADDR(mp, block, index) \
75 ((xfs_alloc_rec_t *) \
76 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110077 XFS_ALLOC_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +110078 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Christoph Hellwig136341b2008-10-30 17:11:40 +110080#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
81 ((xfs_alloc_key_t *) \
82 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110083 XFS_ALLOC_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +110084 ((index) - 1) * sizeof(xfs_alloc_key_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Christoph Hellwig136341b2008-10-30 17:11:40 +110086#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
87 ((xfs_alloc_ptr_t *) \
88 ((char *)(block) + \
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110089 XFS_ALLOC_BLOCK_LEN(mp) + \
Christoph Hellwig136341b2008-10-30 17:11:40 +110090 (maxrecs) * sizeof(xfs_alloc_key_t) + \
91 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
Christoph Hellwig561f7d12008-10-30 16:53:59 +110092
93extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
94 struct xfs_trans *, struct xfs_buf *,
95 xfs_agnumber_t, xfs_btnum_t);
Christoph Hellwig60197e82008-10-30 17:11:19 +110096extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
Christoph Hellwig561f7d12008-10-30 16:53:59 +110097
Dave Chinner1813dd62012-11-14 17:54:40 +110098extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#endif /* __XFS_ALLOC_BTREE_H__ */