fs/xfs/xfs_dir2_leaf.h

   1 /*
   2  * Copyright (c) 2000-2001 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_LEAF_H__
  33 #define __XFS_DIR2_LEAF_H__
  34
  35 /*
  36  * Directory version 2, leaf block structures.
  37  */
  38
  39 struct uio;
  40 struct xfs_dabuf;
  41 struct xfs_da_args;
  42 struct xfs_inode;
  43 struct xfs_mount;
  44 struct xfs_trans;
  45
  46 /*
  47  * Constants.
  48  */
  49
  50 /*
  51  * Offset of the leaf/node space.  First block in this space
  52  * is the btree root.
  53  */
  54 #define XFS_DIR2_LEAF_SPACE     1
  55 #define XFS_DIR2_LEAF_OFFSET    (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
  56 #define XFS_DIR2_LEAF_FIRSTDB(mp)       \
  57         XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET)
  58
  59 /*
  60  * Types.
  61  */
  62
  63 /*
  64  * Offset in data space of a data entry.
  65  */
  66 typedef __uint32_t      xfs_dir2_dataptr_t;
  67 #define XFS_DIR2_MAX_DATAPTR    ((xfs_dir2_dataptr_t)0xffffffff)
  68 #define XFS_DIR2_NULL_DATAPTR   ((xfs_dir2_dataptr_t)0)
  69
  70 /*
  71  * Structures.
  72  */
  73
  74 /*
  75  * Leaf block header.
  76  */
  77 typedef struct xfs_dir2_leaf_hdr {
  78         xfs_da_blkinfo_t        info;           /* header for da routines */
  79         __uint16_t              count;          /* count of entries */
  80         __uint16_t              stale;          /* count of stale entries */
  81 } xfs_dir2_leaf_hdr_t;
  82
  83 /*
  84  * Leaf block entry.
  85  */
  86 typedef struct xfs_dir2_leaf_entry {
  87         xfs_dahash_t            hashval;        /* hash value of name */
  88         xfs_dir2_dataptr_t      address;        /* address of data entry */
  89 } xfs_dir2_leaf_entry_t;
  90
  91 /*
  92  * Leaf block tail.
  93  */
  94 typedef struct xfs_dir2_leaf_tail {
  95         __uint32_t              bestcount;
  96 } xfs_dir2_leaf_tail_t;
  97
  98 /*
  99  * Leaf block.
 100  * bests and tail are at the end of the block for single-leaf only
 101  * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC).
 102  */
 103 typedef struct xfs_dir2_leaf {
 104         xfs_dir2_leaf_hdr_t     hdr;            /* leaf header */
 105         xfs_dir2_leaf_entry_t   ents[1];        /* entries */
 106                                                 /* ... */
 107         xfs_dir2_data_off_t     bests[1];       /* best free counts */
 108         xfs_dir2_leaf_tail_t    tail;           /* leaf tail */
 109 } xfs_dir2_leaf_t;
 110
 111 /*
 112  * Macros.
 113  * The DB blocks are logical directory block numbers, not filesystem blocks.
 114  */
 115
 116 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_MAX_LEAF_ENTS)
 117 int
 118 xfs_dir2_max_leaf_ents(struct xfs_mount *mp);
 119 #define XFS_DIR2_MAX_LEAF_ENTS(mp)      \
 120         xfs_dir2_max_leaf_ents(mp)
 121 #else
 122 #define XFS_DIR2_MAX_LEAF_ENTS(mp)      \
 123         ((int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) / \
 124                (uint)sizeof(xfs_dir2_leaf_entry_t)))
 125 #endif
 126
 127 /*
 128  * Get address of the bestcount field in the single-leaf block.
 129  */
 130 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_TAIL_P)
 131 xfs_dir2_leaf_tail_t *
 132 xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp);
 133 #define XFS_DIR2_LEAF_TAIL_P(mp,lp)     \
 134         xfs_dir2_leaf_tail_p(mp, lp)
 135 #else
 136 #define XFS_DIR2_LEAF_TAIL_P(mp,lp)     \
 137         ((xfs_dir2_leaf_tail_t *)\
 138          ((char *)(lp) + (mp)->m_dirblksize - \
 139           (uint)sizeof(xfs_dir2_leaf_tail_t)))
 140 #endif
 141
 142 /*
 143  * Get address of the bests array in the single-leaf block.
 144  */
 145 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_BESTS_P)
 146 xfs_dir2_data_off_t *
 147 xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp);
 148 #define XFS_DIR2_LEAF_BESTS_P(ltp)      xfs_dir2_leaf_bests_p(ltp)
 149 #else
 150 #define XFS_DIR2_LEAF_BESTS_P(ltp)      \
 151         ((xfs_dir2_data_off_t *)(ltp) - INT_GET((ltp)->bestcount, ARCH_CONVERT))
 152 #endif
 153
 154 /*
 155  * Convert dataptr to byte in file space
 156  */
 157 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_BYTE)
 158 xfs_dir2_off_t
 159 xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
 160 #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp)
 161 #else
 162 #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) \
 163         ((xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG)
 164 #endif
 165
 166 /*
 167  * Convert byte in file space to dataptr.  It had better be aligned.
 168  */
 169 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DATAPTR)
 170 xfs_dir2_dataptr_t
 171 xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by);
 172 #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by)
 173 #else
 174 #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) \
 175         ((xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG))
 176 #endif
 177
 178 /*
 179  * Convert dataptr to a block number
 180  */
 181 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_DB)
 182 xfs_dir2_db_t
 183 xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
 184 #define XFS_DIR2_DATAPTR_TO_DB(mp,dp)   xfs_dir2_dataptr_to_db(mp, dp)
 185 #else
 186 #define XFS_DIR2_DATAPTR_TO_DB(mp,dp)   \
 187         XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp))
 188 #endif
 189
 190 /*
 191  * Convert dataptr to a byte offset in a block
 192  */
 193 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_OFF)
 194 xfs_dir2_data_aoff_t
 195 xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
 196 #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp)  xfs_dir2_dataptr_to_off(mp, dp)
 197 #else
 198 #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp)  \
 199         XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp))
 200 #endif
 201
 202 /*
 203  * Convert block and offset to byte in space
 204  */
 205 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_BYTE)
 206 xfs_dir2_off_t
 207 xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
 208                         xfs_dir2_data_aoff_t o);
 209 #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)        \
 210         xfs_dir2_db_off_to_byte(mp, db, o)
 211 #else
 212 #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)        \
 213         (((xfs_dir2_off_t)(db) << \
 214          ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o))
 215 #endif
 216
 217 /*
 218  * Convert byte in space to (DB) block
 219  */
 220 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DB)
 221 xfs_dir2_db_t xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by);
 222 #define XFS_DIR2_BYTE_TO_DB(mp,by)      xfs_dir2_byte_to_db(mp, by)
 223 #else
 224 #define XFS_DIR2_BYTE_TO_DB(mp,by)      \
 225         ((xfs_dir2_db_t)((by) >> \
 226                          ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)))
 227 #endif
 228
 229 /*
 230  * Convert byte in space to (DA) block
 231  */
 232 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DA)
 233 xfs_dablk_t xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by);
 234 #define XFS_DIR2_BYTE_TO_DA(mp,by)      xfs_dir2_byte_to_da(mp, by)
 235 #else
 236 #define XFS_DIR2_BYTE_TO_DA(mp,by)      \
 237         XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by))
 238 #endif
 239
 240 /*
 241  * Convert byte in space to offset in a block
 242  */
 243 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_OFF)
 244 xfs_dir2_data_aoff_t
 245 xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by);
 246 #define XFS_DIR2_BYTE_TO_OFF(mp,by)     xfs_dir2_byte_to_off(mp, by)
 247 #else
 248 #define XFS_DIR2_BYTE_TO_OFF(mp,by)     \
 249         ((xfs_dir2_data_aoff_t)((by) & \
 250                                 ((1 << ((mp)->m_sb.sb_blocklog + \
 251                                         (mp)->m_sb.sb_dirblklog)) - 1)))
 252 #endif
 253
 254 /*
 255  * Convert block and offset to dataptr
 256  */
 257 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_DATAPTR)
 258 xfs_dir2_dataptr_t
 259 xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
 260                            xfs_dir2_data_aoff_t o);
 261 #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)     \
 262         xfs_dir2_db_off_to_dataptr(mp, db, o)
 263 #else
 264 #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)     \
 265         XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o))
 266 #endif
 267
 268 /*
 269  * Convert block (DB) to block (dablk)
 270  */
 271 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_DA)
 272 xfs_dablk_t xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db);
 273 #define XFS_DIR2_DB_TO_DA(mp,db)        xfs_dir2_db_to_da(mp, db)
 274 #else
 275 #define XFS_DIR2_DB_TO_DA(mp,db)        \
 276         ((xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog))
 277 #endif
 278
 279 /*
 280  * Convert block (dablk) to block (DB)
 281  */
 282 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_DB)
 283 xfs_dir2_db_t xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da);
 284 #define XFS_DIR2_DA_TO_DB(mp,da)        xfs_dir2_da_to_db(mp, da)
 285 #else
 286 #define XFS_DIR2_DA_TO_DB(mp,da)        \
 287         ((xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog))
 288 #endif
 289
 290 /*
 291  * Convert block (dablk) to byte offset in space
 292  */
 293 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_BYTE)
 294 xfs_dir2_off_t xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da);
 295 #define XFS_DIR2_DA_TO_BYTE(mp,da)      xfs_dir2_da_to_byte(mp, da)
 296 #else
 297 #define XFS_DIR2_DA_TO_BYTE(mp,da)      \
 298         XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0)
 299 #endif
 300
 301 /*
 302  * Function declarations.
 303  */
 304
 305 extern int
 306         xfs_dir2_block_to_leaf(struct xfs_da_args *args, struct xfs_dabuf *dbp);
 307
 308 extern int
 309         xfs_dir2_leaf_addname(struct xfs_da_args *args);
 310
 311 extern void
 312         xfs_dir2_leaf_compact(struct xfs_da_args *args, struct xfs_dabuf *bp);
 313
 314 extern void
 315         xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
 316                                  int *lowstalep, int *highstalep, int *lowlogp,
 317                                  int *highlogp);
 318
 319 extern int
 320         xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
 321                                struct uio *uio, int *eofp, struct xfs_dirent *dbp,
 322                                xfs_dir2_put_t put);
 323
 324 extern int
 325         xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
 326                            struct xfs_dabuf **bpp, int magic);
 327
 328 extern void
 329         xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
 330                                int first, int last);
 331
 332 extern void
 333         xfs_dir2_leaf_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp);
 334
 335 extern int
 336         xfs_dir2_leaf_lookup(struct xfs_da_args *args);
 337
 338 extern int
 339         xfs_dir2_leaf_removename(struct xfs_da_args *args);
 340
 341 extern int
 342         xfs_dir2_leaf_replace(struct xfs_da_args *args);
 343
 344 extern int
 345         xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
 346                                   struct xfs_dabuf *lbp);
 347 extern int
 348         xfs_dir2_leaf_trim_data(struct xfs_da_args *args, struct xfs_dabuf *lbp,                                xfs_dir2_db_t db);
 349
 350 extern int
 351         xfs_dir2_node_to_leaf(struct xfs_da_state *state);
 352
 353 #endif  /* __XFS_DIR2_LEAF_H__ */