1 /* 2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it is 13 * free of the rightful claim of any third person regarding infringement 14 * or the like. Any license provided herein, whether implied or 15 * otherwise, applies only to this software file. Patent licenses, if 16 * any, provided herein do not apply to combinations of this program with 17 * other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write the Free Software Foundation, Inc., 59 21 * Temple Place - Suite 330, Boston MA 02111-1307, USA. 22 * 23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 24 * Mountain View, CA 94043, or: 25 * 26 * http://www.sgi.com 27 * 28 * For further information regarding this notice, see: 29 * 30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ 31 */ 32 #ifndef __XFS_DIR2_NODE_H__ 33 #define __XFS_DIR2_NODE_H__ 34 35 /* 36 * Directory version 2, btree node format structures 37 */ 38 39 struct uio; 40 struct xfs_dabuf; 41 struct xfs_da_args; 42 struct xfs_da_state; 43 struct xfs_da_state_blk; 44 struct xfs_inode; 45 struct xfs_trans; 46 47 /* 48 * Constants. 49 */ 50 51 /* 52 * Offset of the freespace index. 53 */ 54 #define XFS_DIR2_FREE_SPACE 2 55 #define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE) 56 #define XFS_DIR2_FREE_FIRSTDB(mp) \ 57 XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_FREE_OFFSET) 58 59 #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */ 60 61 /* 62 * Structures. 63 */ 64 typedef struct xfs_dir2_free_hdr { 65 __uint32_t magic; /* XFS_DIR2_FREE_MAGIC */ 66 __int32_t firstdb; /* db of first entry */ 67 __int32_t nvalid; /* count of valid entries */ 68 __int32_t nused; /* count of used entries */ 69 } xfs_dir2_free_hdr_t; 70 71 typedef struct xfs_dir2_free { 72 xfs_dir2_free_hdr_t hdr; /* block header */ 73 xfs_dir2_data_off_t bests[1]; /* best free counts */ 74 /* unused entries are -1 */ 75 } xfs_dir2_free_t; 76 #define XFS_DIR2_MAX_FREE_BESTS(mp) \ 77 (((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \ 78 (uint)sizeof(xfs_dir2_data_off_t)) 79 80 /* 81 * Macros. 82 */ 83 84 /* 85 * Convert data space db to the corresponding free db. 86 */ 87 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDB) 88 xfs_dir2_db_t 89 xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db); 90 #define XFS_DIR2_DB_TO_FDB(mp,db) xfs_dir2_db_to_fdb(mp, db) 91 #else 92 #define XFS_DIR2_DB_TO_FDB(mp,db) \ 93 (XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp)) 94 #endif 95 96 /* 97 * Convert data space db to the corresponding index in a free db. 98 */ 99 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDINDEX) 100 int 101 xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db); 102 #define XFS_DIR2_DB_TO_FDINDEX(mp,db) xfs_dir2_db_to_fdindex(mp, db) 103 #else 104 #define XFS_DIR2_DB_TO_FDINDEX(mp,db) ((db) % XFS_DIR2_MAX_FREE_BESTS(mp)) 105 #endif 106 107 /* 108 * Functions. 109 */ 110 111 extern void 112 xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, 113 int first, int last); 114 115 extern int 116 xfs_dir2_leaf_to_node(struct xfs_da_args *args, struct xfs_dabuf *lbp); 117 118 extern xfs_dahash_t 119 xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count); 120 121 extern int 122 xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp, 123 struct xfs_da_args *args, int *indexp, 124 struct xfs_da_state *state); 125 126 extern int 127 xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp, 128 struct xfs_dabuf *leaf2_bp); 129 130 extern int 131 xfs_dir2_leafn_split(struct xfs_da_state *state, 132 struct xfs_da_state_blk *oldblk, 133 struct xfs_da_state_blk *newblk); 134 135 extern int 136 xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action); 137 138 extern void 139 xfs_dir2_leafn_unbalance(struct xfs_da_state *state, 140 struct xfs_da_state_blk *drop_blk, 141 struct xfs_da_state_blk *save_blk); 142 143 extern int 144 xfs_dir2_node_addname(struct xfs_da_args *args); 145 146 extern int 147 xfs_dir2_node_lookup(struct xfs_da_args *args); 148 149 extern int 150 xfs_dir2_node_removename(struct xfs_da_args *args); 151 152 extern int 153 xfs_dir2_node_replace(struct xfs_da_args *args); 154 155 extern int 156 xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo, 157 int *rvalp); 158 159 #endif /* __XFS_DIR2_NODE_H__ */ 160