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 * Btree block header size depends on a superblock flag. 29 */ 30 #define XFS_BMBT_BLOCK_LEN(mp) \ 31 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 32 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN) 33 34 #define XFS_BMBT_REC_ADDR(mp, block, index) \ 35 ((xfs_bmbt_rec_t *) \ 36 ((char *)(block) + \ 37 XFS_BMBT_BLOCK_LEN(mp) + \ 38 ((index) - 1) * sizeof(xfs_bmbt_rec_t))) 39 40 #define XFS_BMBT_KEY_ADDR(mp, block, index) \ 41 ((xfs_bmbt_key_t *) \ 42 ((char *)(block) + \ 43 XFS_BMBT_BLOCK_LEN(mp) + \ 44 ((index) - 1) * sizeof(xfs_bmbt_key_t))) 45 46 #define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \ 47 ((xfs_bmbt_ptr_t *) \ 48 ((char *)(block) + \ 49 XFS_BMBT_BLOCK_LEN(mp) + \ 50 (maxrecs) * sizeof(xfs_bmbt_key_t) + \ 51 ((index) - 1) * sizeof(xfs_bmbt_ptr_t))) 52 53 #define XFS_BMDR_REC_ADDR(block, index) \ 54 ((xfs_bmdr_rec_t *) \ 55 ((char *)(block) + \ 56 sizeof(struct xfs_bmdr_block) + \ 57 ((index) - 1) * sizeof(xfs_bmdr_rec_t))) 58 59 #define XFS_BMDR_KEY_ADDR(block, index) \ 60 ((xfs_bmdr_key_t *) \ 61 ((char *)(block) + \ 62 sizeof(struct xfs_bmdr_block) + \ 63 ((index) - 1) * sizeof(xfs_bmdr_key_t))) 64 65 #define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \ 66 ((xfs_bmdr_ptr_t *) \ 67 ((char *)(block) + \ 68 sizeof(struct xfs_bmdr_block) + \ 69 (maxrecs) * sizeof(xfs_bmdr_key_t) + \ 70 ((index) - 1) * sizeof(xfs_bmdr_ptr_t))) 71 72 /* 73 * These are to be used when we know the size of the block and 74 * we don't have a cursor. 75 */ 76 #define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \ 77 XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0)) 78 79 #define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \ 80 (int)(XFS_BMBT_BLOCK_LEN(mp) + \ 81 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t)))) 82 83 #define XFS_BMAP_BROOT_SPACE(mp, bb) \ 84 (XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs))) 85 #define XFS_BMDR_SPACE_CALC(nrecs) \ 86 (int)(sizeof(xfs_bmdr_block_t) + \ 87 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t)))) 88 #define XFS_BMAP_BMDR_SPACE(bb) \ 89 (XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs))) 90 91 /* 92 * Maximum number of bmap btree levels. 93 */ 94 #define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)]) 95 96 /* 97 * Prototypes for xfs_bmap.c to call. 98 */ 99 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int, 100 struct xfs_btree_block *, int); 101 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s); 102 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r); 103 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r); 104 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r); 105 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r); 106 107 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r); 108 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r); 109 110 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s); 111 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o, 112 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v); 113 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v); 114 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v); 115 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v); 116 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v); 117 118 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o, 119 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v); 120 121 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int, 122 xfs_bmdr_block_t *, int); 123 124 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level); 125 extern int xfs_bmdr_maxrecs(int blocklen, int leaf); 126 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf); 127 128 extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip, 129 int whichfork, xfs_ino_t new_owner, 130 struct list_head *buffer_list); 131 132 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *, 133 struct xfs_trans *, struct xfs_inode *, int); 134 135 /* 136 * Check that the extent does not contain an invalid unwritten extent flag. 137 */ 138 static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork, 139 struct xfs_bmbt_rec_host *ep) 140 { 141 if (ep->l0 >> (64 - BMBT_EXNTFLAG_BITLEN) == 0) 142 return true; 143 if (whichfork == XFS_DATA_FORK && 144 xfs_sb_version_hasextflgbit(&mp->m_sb)) 145 return true; 146 return false; 147 } 148 149 #endif /* __XFS_BMAP_BTREE_H__ */ 150