fs/xfs/xfs_dir2_leaf.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_LEAF_H__
  19 #define __XFS_DIR2_LEAF_H__
  20
  21 struct uio;
  22 struct xfs_dabuf;
  23 struct xfs_da_args;
  24 struct xfs_inode;
  25 struct xfs_mount;
  26 struct xfs_trans;
  27
  28 /*
  29  * Offset of the leaf/node space.  First block in this space
  30  * is the btree root.
  31  */
  32 #define XFS_DIR2_LEAF_SPACE     1
  33 #define XFS_DIR2_LEAF_OFFSET    (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
  34 #define XFS_DIR2_LEAF_FIRSTDB(mp)       \
  35         XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET)
  36
  37 /*
  38  * Offset in data space of a data entry.
  39  */
  40 typedef __uint32_t      xfs_dir2_dataptr_t;
  41 #define XFS_DIR2_MAX_DATAPTR    ((xfs_dir2_dataptr_t)0xffffffff)
  42 #define XFS_DIR2_NULL_DATAPTR   ((xfs_dir2_dataptr_t)0)
  43
  44 /*
  45  * Leaf block header.
  46  */
  47 typedef struct xfs_dir2_leaf_hdr {
  48         xfs_da_blkinfo_t        info;           /* header for da routines */
  49         __be16                  count;          /* count of entries */
  50         __be16                  stale;          /* count of stale entries */
  51 } xfs_dir2_leaf_hdr_t;
  52
  53 /*
  54  * Leaf block entry.
  55  */
  56 typedef struct xfs_dir2_leaf_entry {
  57         __be32                  hashval;        /* hash value of name */
  58         __be32                  address;        /* address of data entry */
  59 } xfs_dir2_leaf_entry_t;
  60
  61 /*
  62  * Leaf block tail.
  63  */
  64 typedef struct xfs_dir2_leaf_tail {
  65         __be32                  bestcount;
  66 } xfs_dir2_leaf_tail_t;
  67
  68 /*
  69  * Leaf block.
  70  * bests and tail are at the end of the block for single-leaf only
  71  * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC).
  72  */
  73 typedef struct xfs_dir2_leaf {
  74         xfs_dir2_leaf_hdr_t     hdr;            /* leaf header */
  75         xfs_dir2_leaf_entry_t   ents[1];        /* entries */
  76                                                 /* ... */
  77         xfs_dir2_data_off_t     bests[1];       /* best free counts */
  78         xfs_dir2_leaf_tail_t    tail;           /* leaf tail */
  79 } xfs_dir2_leaf_t;
  80
  81 /*
  82  * DB blocks here are logical directory block numbers, not filesystem blocks.
  83  */
  84
  85 #define XFS_DIR2_MAX_LEAF_ENTS(mp)      xfs_dir2_max_leaf_ents(mp)
  86 static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
  87 {
  88         return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) /
  89                (uint)sizeof(xfs_dir2_leaf_entry_t));
  90 }
  91
  92 /*
  93  * Get address of the bestcount field in the single-leaf block.
  94  */
  95 #define XFS_DIR2_LEAF_TAIL_P(mp,lp)     xfs_dir2_leaf_tail_p(mp, lp)
  96 static inline xfs_dir2_leaf_tail_t *
  97 xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp)
  98 {
  99         return (xfs_dir2_leaf_tail_t *)
 100                 ((char *)(lp) + (mp)->m_dirblksize -
 101                   (uint)sizeof(xfs_dir2_leaf_tail_t));
 102 }
 103
 104 /*
 105  * Get address of the bests array in the single-leaf block.
 106  */
 107 #define XFS_DIR2_LEAF_BESTS_P(ltp)      xfs_dir2_leaf_bests_p(ltp)
 108 static inline __be16 *
 109 xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
 110 {
 111         return (__be16 *)ltp - be32_to_cpu(ltp->bestcount);
 112 }
 113
 114 /*
 115  * Convert dataptr to byte in file space
 116  */
 117 #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp)
 118 static inline xfs_dir2_off_t
 119 xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 120 {
 121         return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
 122 }
 123
 124 /*
 125  * Convert byte in file space to dataptr.  It had better be aligned.
 126  */
 127 #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by)
 128 static inline xfs_dir2_dataptr_t
 129 xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
 130 {
 131         return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
 132 }
 133
 134 /*
 135  * Convert byte in space to (DB) block
 136  */
 137 #define XFS_DIR2_BYTE_TO_DB(mp,by)      xfs_dir2_byte_to_db(mp, by)
 138 static inline xfs_dir2_db_t
 139 xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
 140 {
 141         return (xfs_dir2_db_t)((by) >> \
 142                  ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
 143 }
 144
 145 /*
 146  * Convert dataptr to a block number
 147  */
 148 #define XFS_DIR2_DATAPTR_TO_DB(mp,dp)   xfs_dir2_dataptr_to_db(mp, dp)
 149 static inline xfs_dir2_db_t
 150 xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 151 {
 152         return XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
 153 }
 154
 155 /*
 156  * Convert byte in space to offset in a block
 157  */
 158 #define XFS_DIR2_BYTE_TO_OFF(mp,by)     xfs_dir2_byte_to_off(mp, by)
 159 static inline xfs_dir2_data_aoff_t
 160 xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
 161 {
 162         return (xfs_dir2_data_aoff_t)((by) & \
 163                 ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
 164 }
 165
 166 /*
 167  * Convert dataptr to a byte offset in a block
 168  */
 169 #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp)  xfs_dir2_dataptr_to_off(mp, dp)
 170 static inline xfs_dir2_data_aoff_t
 171 xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 172 {
 173         return XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
 174 }
 175
 176 /*
 177  * Convert block and offset to byte in space
 178  */
 179 #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)        \
 180         xfs_dir2_db_off_to_byte(mp, db, o)
 181 static inline xfs_dir2_off_t
 182 xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
 183                         xfs_dir2_data_aoff_t o)
 184 {
 185         return ((xfs_dir2_off_t)(db) << \
 186                 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
 187 }
 188
 189 /*
 190  * Convert block (DB) to block (dablk)
 191  */
 192 #define XFS_DIR2_DB_TO_DA(mp,db)        xfs_dir2_db_to_da(mp, db)
 193 static inline xfs_dablk_t
 194 xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
 195 {
 196         return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
 197 }
 198
 199 /*
 200  * Convert byte in space to (DA) block
 201  */
 202 #define XFS_DIR2_BYTE_TO_DA(mp,by)      xfs_dir2_byte_to_da(mp, by)
 203 static inline xfs_dablk_t
 204 xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
 205 {
 206         return XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by));
 207 }
 208
 209 /*
 210  * Convert block and offset to dataptr
 211  */
 212 #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)     \
 213         xfs_dir2_db_off_to_dataptr(mp, db, o)
 214 static inline xfs_dir2_dataptr_t
 215 xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
 216                            xfs_dir2_data_aoff_t o)
 217 {
 218         return XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o));
 219 }
 220
 221 /*
 222  * Convert block (dablk) to block (DB)
 223  */
 224 #define XFS_DIR2_DA_TO_DB(mp,da)        xfs_dir2_da_to_db(mp, da)
 225 static inline xfs_dir2_db_t
 226 xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
 227 {
 228         return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
 229 }
 230
 231 /*
 232  * Convert block (dablk) to byte offset in space
 233  */
 234 #define XFS_DIR2_DA_TO_BYTE(mp,da)      xfs_dir2_da_to_byte(mp, da)
 235 static inline xfs_dir2_off_t
 236 xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
 237 {
 238         return XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0);
 239 }
 240
 241 /*
 242  * Function declarations.
 243  */
 244 extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
 245                                   struct xfs_dabuf *dbp);
 246 extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
 247 extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
 248                                   struct xfs_dabuf *bp);
 249 extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
 250                                      int *lowstalep, int *highstalep,
 251                                      int *lowlogp, int *highlogp);
 252 extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
 253                                   struct uio *uio, int *eofp,
 254                                   struct xfs_dirent *dbp, xfs_dir2_put_t put);
 255 extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
 256                               struct xfs_dabuf **bpp, int magic);
 257 extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
 258                                    int first, int last);
 259 extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
 260                                      struct xfs_dabuf *bp);
 261 extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
 262 extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
 263 extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
 264 extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
 265                                      struct xfs_dabuf *lbp);
 266 extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
 267                                    struct xfs_dabuf *lbp, xfs_dir2_db_t db);
 268 extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
 269
 270 #endif  /* __XFS_DIR2_LEAF_H__ */