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         __uint16_t              count;          /* count of entries */
  50         __uint16_t              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         xfs_dahash_t            hashval;        /* hash value of name */
  58         xfs_dir2_dataptr_t      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         __uint32_t              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 xfs_dir2_data_off_t *
 109 xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
 110 {
 111         return (xfs_dir2_data_off_t *)
 112                 (ltp) - INT_GET((ltp)->bestcount, ARCH_CONVERT);
 113 }
 114
 115 /*
 116  * Convert dataptr to byte in file space
 117  */
 118 #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp)
 119 static inline xfs_dir2_off_t
 120 xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 121 {
 122         return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
 123 }
 124
 125 /*
 126  * Convert byte in file space to dataptr.  It had better be aligned.
 127  */
 128 #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by)
 129 static inline xfs_dir2_dataptr_t
 130 xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
 131 {
 132         return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
 133 }
 134
 135 /*
 136  * Convert byte in space to (DB) block
 137  */
 138 #define XFS_DIR2_BYTE_TO_DB(mp,by)      xfs_dir2_byte_to_db(mp, by)
 139 static inline xfs_dir2_db_t
 140 xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
 141 {
 142         return (xfs_dir2_db_t)((by) >> \
 143                  ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
 144 }
 145
 146 /*
 147  * Convert dataptr to a block number
 148  */
 149 #define XFS_DIR2_DATAPTR_TO_DB(mp,dp)   xfs_dir2_dataptr_to_db(mp, dp)
 150 static inline xfs_dir2_db_t
 151 xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 152 {
 153         return XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
 154 }
 155
 156 /*
 157  * Convert byte in space to offset in a block
 158  */
 159 #define XFS_DIR2_BYTE_TO_OFF(mp,by)     xfs_dir2_byte_to_off(mp, by)
 160 static inline xfs_dir2_data_aoff_t
 161 xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
 162 {
 163         return (xfs_dir2_data_aoff_t)((by) & \
 164                 ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
 165 }
 166
 167 /*
 168  * Convert dataptr to a byte offset in a block
 169  */
 170 #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp)  xfs_dir2_dataptr_to_off(mp, dp)
 171 static inline xfs_dir2_data_aoff_t
 172 xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
 173 {
 174         return XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
 175 }
 176
 177 /*
 178  * Convert block and offset to byte in space
 179  */
 180 #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)        \
 181         xfs_dir2_db_off_to_byte(mp, db, o)
 182 static inline xfs_dir2_off_t
 183 xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
 184                         xfs_dir2_data_aoff_t o)
 185 {
 186         return ((xfs_dir2_off_t)(db) << \
 187                 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
 188 }
 189
 190 /*
 191  * Convert block (DB) to block (dablk)
 192  */
 193 #define XFS_DIR2_DB_TO_DA(mp,db)        xfs_dir2_db_to_da(mp, db)
 194 static inline xfs_dablk_t
 195 xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
 196 {
 197         return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
 198 }
 199
 200 /*
 201  * Convert byte in space to (DA) block
 202  */
 203 #define XFS_DIR2_BYTE_TO_DA(mp,by)      xfs_dir2_byte_to_da(mp, by)
 204 static inline xfs_dablk_t
 205 xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
 206 {
 207         return XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by));
 208 }
 209
 210 /*
 211  * Convert block and offset to dataptr
 212  */
 213 #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)     \
 214         xfs_dir2_db_off_to_dataptr(mp, db, o)
 215 static inline xfs_dir2_dataptr_t
 216 xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
 217                            xfs_dir2_data_aoff_t o)
 218 {
 219         return XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o));
 220 }
 221
 222 /*
 223  * Convert block (dablk) to block (DB)
 224  */
 225 #define XFS_DIR2_DA_TO_DB(mp,da)        xfs_dir2_da_to_db(mp, da)
 226 static inline xfs_dir2_db_t
 227 xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
 228 {
 229         return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
 230 }
 231
 232 /*
 233  * Convert block (dablk) to byte offset in space
 234  */
 235 #define XFS_DIR2_DA_TO_BYTE(mp,da)      xfs_dir2_da_to_byte(mp, da)
 236 static inline xfs_dir2_off_t
 237 xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
 238 {
 239         return XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0);
 240 }
 241
 242 /*
 243  * Function declarations.
 244  */
 245 extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
 246                                   struct xfs_dabuf *dbp);
 247 extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
 248 extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
 249                                   struct xfs_dabuf *bp);
 250 extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
 251                                      int *lowstalep, int *highstalep,
 252                                      int *lowlogp, int *highlogp);
 253 extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
 254                                   struct uio *uio, int *eofp,
 255                                   struct xfs_dirent *dbp, xfs_dir2_put_t put);
 256 extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
 257                               struct xfs_dabuf **bpp, int magic);
 258 extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
 259                                    int first, int last);
 260 extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
 261                                      struct xfs_dabuf *bp);
 262 extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
 263 extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
 264 extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
 265 extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
 266                                      struct xfs_dabuf *lbp);
 267 extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
 268                                    struct xfs_dabuf *lbp, xfs_dir2_db_t db);
 269 extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
 270
 271 #endif  /* __XFS_DIR2_LEAF_H__ */