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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_bmap_btree.h

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  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 
 21 struct xfs_btree_cur;
 22 struct xfs_btree_block;
 23 struct xfs_mount;
 24 struct xfs_inode;
 25 struct 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  */
107 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
108                         struct xfs_btree_block *, int);
109 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
110 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
111 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
112 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
113 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
114 
115 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
116 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
117 
118 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
119 extern 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);
121 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
122 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
123 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
124 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
125 
126 extern 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 
129 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
130                         xfs_bmdr_block_t *, int);
131 
132 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
133 extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
134 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
135 
136 extern 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 
140 extern 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__ */
144 

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