1/*
  2 * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.
  3 * All Rights Reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or
  6 * modify it under the terms of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * 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.
 13 *
 14 * 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
 17 */
 18#ifndef __XFS_BMAP_BTREE_H__
 19#define __XFS_BMAP_BTREE_H__
 20
 21struct xfs_btree_cur;
 22struct xfs_btree_block;
 23struct xfs_mount;
 24struct xfs_inode;
 25struct xfs_trans;
 26
 27/*
 28 * Extent state and extent format macros.
 29 */
 30#define XFS_EXTFMT_INODE(x)	\
 31	(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
 32		XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
 33#define ISUNWRITTEN(x)	((x)->br_state == XFS_EXT_UNWRITTEN)
 34
 35/*
 36 * Btree block header size depends on a superblock flag.
 37 */
 38#define XFS_BMBT_BLOCK_LEN(mp) \
 39	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
 40		XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
 41
 42#define XFS_BMBT_REC_ADDR(mp, block, index) \
 43	((xfs_bmbt_rec_t *) \
 44		((char *)(block) + \
 45		 XFS_BMBT_BLOCK_LEN(mp) + \
 46		 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
 47
 48#define XFS_BMBT_KEY_ADDR(mp, block, index) \
 49	((xfs_bmbt_key_t *) \
 50		((char *)(block) + \
 51		 XFS_BMBT_BLOCK_LEN(mp) + \
 52		 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
 53
 54#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
 55	((xfs_bmbt_ptr_t *) \
 56		((char *)(block) + \
 57		 XFS_BMBT_BLOCK_LEN(mp) + \
 58		 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
 59		 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
 60
 61#define XFS_BMDR_REC_ADDR(block, index) \
 62	((xfs_bmdr_rec_t *) \
 63		((char *)(block) + \
 64		 sizeof(struct xfs_bmdr_block) + \
 65	         ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
 66
 67#define XFS_BMDR_KEY_ADDR(block, index) \
 68	((xfs_bmdr_key_t *) \
 69		((char *)(block) + \
 70		 sizeof(struct xfs_bmdr_block) + \
 71		 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
 72
 73#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
 74	((xfs_bmdr_ptr_t *) \
 75		((char *)(block) + \
 76		 sizeof(struct xfs_bmdr_block) + \
 77		 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
 78		 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
 79
 80/*
 81 * These are to be used when we know the size of the block and
 82 * we don't have a cursor.
 83 */
 84#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
 85	XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
 86
 87#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
 88	(int)(XFS_BMBT_BLOCK_LEN(mp) + \
 89	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
 90
 91#define XFS_BMAP_BROOT_SPACE(mp, bb) \
 92	(XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
 93#define XFS_BMDR_SPACE_CALC(nrecs) \
 94	(int)(sizeof(xfs_bmdr_block_t) + \
 95	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
 96#define XFS_BMAP_BMDR_SPACE(bb) \
 97	(XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
 98
 99/*
100 * Maximum number of bmap btree levels.
101 */
102#define XFS_BM_MAXLEVELS(mp,w)		((mp)->m_bm_maxlevels[(w)])
103
104/*
105 * Prototypes for xfs_bmap.c to call.
106 */
107extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
108			struct xfs_btree_block *, int);
109extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
110extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
111extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
112extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
113extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
114
115extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
116extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
117
118extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
119extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
120			xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
121extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
122extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
123extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
124extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
125
126extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
127			xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
128
129extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
130			xfs_bmdr_block_t *, int);
131
132extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
133extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
134extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
135
136extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
137				 int whichfork, xfs_ino_t new_owner,
138				 struct list_head *buffer_list);
139
140extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
141		struct xfs_trans *, struct xfs_inode *, int);
142
143#endif	/* __XFS_BMAP_BTREE_H__ */