fs/xfs/libxfs/xfs_dir2.h

   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
  21 struct xfs_bmap_free;
  22 struct xfs_da_args;
  23 struct xfs_inode;
  24 struct xfs_mount;
  25 struct xfs_trans;
  26 struct xfs_dir2_sf_hdr;
  27 struct xfs_dir2_sf_entry;
  28 struct xfs_dir2_data_hdr;
  29 struct xfs_dir2_data_entry;
  30 struct xfs_dir2_data_unused;
  31
  32 extern struct xfs_name  xfs_name_dotdot;
  33
  34 /*
  35  * directory filetype conversion tables.
  36  */
  37 #define S_SHIFT 12
  38 extern const unsigned char xfs_mode_to_ftype[];
  39
  40 /*
  41  * directory operations vector for encode/decode routines
  42  */
  43 struct 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
 114 extern const struct xfs_dir_ops *
 115         xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
 116 extern 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  */
 122 extern void xfs_dir_startup(void);
 123 extern int xfs_da_mount(struct xfs_mount *mp);
 124 extern void xfs_da_unmount(struct xfs_mount *mp);
 125
 126 extern int xfs_dir_isempty(struct xfs_inode *dp);
 127 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
 128                                 struct xfs_inode *pdp);
 129 extern 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);
 133 extern 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);
 136 extern 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);
 140 extern 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);
 144 extern 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  */
 150 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
 151
 152 /*
 153  * Interface routines used by userspace utilities
 154  */
 155 extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
 156 extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
 157 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
 158                                 struct xfs_buf *bp);
 159
 160 extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
 161                 struct xfs_dir2_data_hdr *hdr, int *loghead);
 162 extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
 163                 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
 164 extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
 165                 struct xfs_buf *bp);
 166 extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
 167                 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
 168 extern 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);
 171 extern 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
 176 extern 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
 180 extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
 181 extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
 182 extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
 183 extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
 184 extern 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  */
 195 static inline xfs_dir2_off_t
 196 xfs_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  */
 204 static inline xfs_dir2_dataptr_t
 205 xfs_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  */
 213 static inline xfs_dir2_db_t
 214 xfs_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  */
 222 static inline xfs_dir2_db_t
 223 xfs_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  */
 231 static inline xfs_dir2_data_aoff_t
 232 xfs_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  */
 240 static inline xfs_dir2_data_aoff_t
 241 xfs_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  */
 249 static inline xfs_dir2_off_t
 250 xfs_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  */
 259 static inline xfs_dablk_t
 260 xfs_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  */
 268 static inline xfs_dablk_t
 269 xfs_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  */
 277 static inline xfs_dir2_dataptr_t
 278 xfs_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  */
 287 static inline xfs_dir2_db_t
 288 xfs_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  */
 296 static inline xfs_dir2_off_t
 297 xfs_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  */
 305 static inline struct xfs_dir2_block_tail *
 306 xfs_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
 312 static inline struct xfs_dir2_leaf_tail *
 313 xfs_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__ */