1/* 2 * Copyright (c) 2000-2001,2005 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_DIR2_H__ 19#define __XFS_DIR2_H__ 20 21struct xfs_bmap_free; 22struct xfs_da_args; 23struct xfs_inode; 24struct xfs_mount; 25struct xfs_trans; 26struct xfs_dir2_sf_hdr; 27struct xfs_dir2_sf_entry; 28struct xfs_dir2_data_hdr; 29struct xfs_dir2_data_entry; 30struct xfs_dir2_data_unused; 31 32extern struct xfs_name xfs_name_dotdot; 33 34/* 35 * directory filetype conversion tables. 36 */ 37#define S_SHIFT 12 38extern const unsigned char xfs_mode_to_ftype[]; 39 40/* 41 * directory operations vector for encode/decode routines 42 */ 43struct xfs_dir_ops { 44 int (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len); 45 struct xfs_dir2_sf_entry * 46 (*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr, 47 struct xfs_dir2_sf_entry *sfep); 48 __uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep); 49 void (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep, 50 __uint8_t ftype); 51 xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr, 52 struct xfs_dir2_sf_entry *sfep); 53 void (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr, 54 struct xfs_dir2_sf_entry *sfep, 55 xfs_ino_t ino); 56 xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr); 57 void (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr, 58 xfs_ino_t ino); 59 60 int (*data_entsize)(int len); 61 __uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep); 62 void (*data_put_ftype)(struct xfs_dir2_data_entry *dep, 63 __uint8_t ftype); 64 __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep); 65 struct xfs_dir2_data_free * 66 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr); 67 68 xfs_dir2_data_aoff_t data_dot_offset; 69 xfs_dir2_data_aoff_t data_dotdot_offset; 70 xfs_dir2_data_aoff_t data_first_offset; 71 size_t data_entry_offset; 72 73 struct xfs_dir2_data_entry * 74 (*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr); 75 struct xfs_dir2_data_entry * 76 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr); 77 struct xfs_dir2_data_entry * 78 (*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr); 79 struct xfs_dir2_data_entry * 80 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr); 81 struct xfs_dir2_data_unused * 82 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr); 83 84 int leaf_hdr_size; 85 void (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to, 86 struct xfs_dir3_icleaf_hdr *from); 87 void (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to, 88 struct xfs_dir2_leaf *from); 89 int (*leaf_max_ents)(struct xfs_da_geometry *geo); 90 struct xfs_dir2_leaf_entry * 91 (*leaf_ents_p)(struct xfs_dir2_leaf *lp); 92 93 int node_hdr_size; 94 void (*node_hdr_to_disk)(struct xfs_da_intnode *to, 95 struct xfs_da3_icnode_hdr *from); 96 void (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to, 97 struct xfs_da_intnode *from); 98 struct xfs_da_node_entry * 99 (*node_tree_p)(struct xfs_da_intnode *dap); 100 101 int free_hdr_size; 102 void (*free_hdr_to_disk)(struct xfs_dir2_free *to, 103 struct xfs_dir3_icfree_hdr *from); 104 void (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to, 105 struct xfs_dir2_free *from); 106 int (*free_max_bests)(struct xfs_da_geometry *geo); 107 __be16 * (*free_bests_p)(struct xfs_dir2_free *free); 108 xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo, 109 xfs_dir2_db_t db); 110 int (*db_to_fdindex)(struct xfs_da_geometry *geo, 111 xfs_dir2_db_t db); 112}; 113 114extern const struct xfs_dir_ops * 115 xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp); 116extern const struct xfs_dir_ops * 117 xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp); 118 119/* 120 * Generic directory interface routines 121 */ 122extern void xfs_dir_startup(void); 123extern int xfs_da_mount(struct xfs_mount *mp); 124extern void xfs_da_unmount(struct xfs_mount *mp); 125 126extern int xfs_dir_isempty(struct xfs_inode *dp); 127extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp, 128 struct xfs_inode *pdp); 129extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp, 130 struct xfs_name *name, xfs_ino_t inum, 131 xfs_fsblock_t *first, 132 struct xfs_bmap_free *flist, xfs_extlen_t tot); 133extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp, 134 struct xfs_name *name, xfs_ino_t *inum, 135 struct xfs_name *ci_name); 136extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp, 137 struct xfs_name *name, xfs_ino_t ino, 138 xfs_fsblock_t *first, 139 struct xfs_bmap_free *flist, xfs_extlen_t tot); 140extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp, 141 struct xfs_name *name, xfs_ino_t inum, 142 xfs_fsblock_t *first, 143 struct xfs_bmap_free *flist, xfs_extlen_t tot); 144extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp, 145 struct xfs_name *name); 146 147/* 148 * Direct call from the bmap code, bypassing the generic directory layer. 149 */ 150extern int xfs_dir2_sf_to_block(struct xfs_da_args *args); 151 152/* 153 * Interface routines used by userspace utilities 154 */ 155extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r); 156extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r); 157extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db, 158 struct xfs_buf *bp); 159 160extern void xfs_dir2_data_freescan(struct xfs_inode *dp, 161 struct xfs_dir2_data_hdr *hdr, int *loghead); 162extern void xfs_dir2_data_log_entry(struct xfs_da_args *args, 163 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep); 164extern void xfs_dir2_data_log_header(struct xfs_da_args *args, 165 struct xfs_buf *bp); 166extern void xfs_dir2_data_log_unused(struct xfs_da_args *args, 167 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup); 168extern void xfs_dir2_data_make_free(struct xfs_da_args *args, 169 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset, 170 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); 171extern void xfs_dir2_data_use_free(struct xfs_da_args *args, 172 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup, 173 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, 174 int *needlogp, int *needscanp); 175 176extern struct xfs_dir2_data_free *xfs_dir2_data_freefind( 177 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf, 178 struct xfs_dir2_data_unused *dup); 179 180extern const struct xfs_buf_ops xfs_dir3_block_buf_ops; 181extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops; 182extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops; 183extern const struct xfs_buf_ops xfs_dir3_free_buf_ops; 184extern const struct xfs_buf_ops xfs_dir3_data_buf_ops; 185 186/* 187 * Directory offset/block conversion functions. 188 * 189 * DB blocks here are logical directory block numbers, not filesystem blocks. 190 */ 191 192/* 193 * Convert dataptr to byte in file space 194 */ 195static inline xfs_dir2_off_t 196xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp) 197{ 198 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG; 199} 200 201/* 202 * Convert byte in file space to dataptr. It had better be aligned. 203 */ 204static inline xfs_dir2_dataptr_t 205xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by) 206{ 207 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG); 208} 209 210/* 211 * Convert byte in space to (DB) block 212 */ 213static inline xfs_dir2_db_t 214xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 215{ 216 return (xfs_dir2_db_t)(by >> geo->blklog); 217} 218 219/* 220 * Convert dataptr to a block number 221 */ 222static inline xfs_dir2_db_t 223xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) 224{ 225 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp)); 226} 227 228/* 229 * Convert byte in space to offset in a block 230 */ 231static inline xfs_dir2_data_aoff_t 232xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 233{ 234 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1)); 235} 236 237/* 238 * Convert dataptr to a byte offset in a block 239 */ 240static inline xfs_dir2_data_aoff_t 241xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp) 242{ 243 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp)); 244} 245 246/* 247 * Convert block and offset to byte in space 248 */ 249static inline xfs_dir2_off_t 250xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db, 251 xfs_dir2_data_aoff_t o) 252{ 253 return ((xfs_dir2_off_t)db << geo->blklog) + o; 254} 255 256/* 257 * Convert block (DB) to block (dablk) 258 */ 259static inline xfs_dablk_t 260xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db) 261{ 262 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog)); 263} 264 265/* 266 * Convert byte in space to (DA) block 267 */ 268static inline xfs_dablk_t 269xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by) 270{ 271 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by)); 272} 273 274/* 275 * Convert block and offset to dataptr 276 */ 277static inline xfs_dir2_dataptr_t 278xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db, 279 xfs_dir2_data_aoff_t o) 280{ 281 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o)); 282} 283 284/* 285 * Convert block (dablk) to block (DB) 286 */ 287static inline xfs_dir2_db_t 288xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da) 289{ 290 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog)); 291} 292 293/* 294 * Convert block (dablk) to byte offset in space 295 */ 296static inline xfs_dir2_off_t 297xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da) 298{ 299 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0); 300} 301 302/* 303 * Directory tail pointer accessor functions. Based on block geometry. 304 */ 305static inline struct xfs_dir2_block_tail * 306xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr) 307{ 308 return ((struct xfs_dir2_block_tail *) 309 ((char *)hdr + geo->blksize)) - 1; 310} 311 312static inline struct xfs_dir2_leaf_tail * 313xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp) 314{ 315 return (struct xfs_dir2_leaf_tail *) 316 ((char *)lp + geo->blksize - 317 sizeof(struct xfs_dir2_leaf_tail)); 318} 319 320#endif /* __XFS_DIR2_H__ */ 321