fs/xfs/xfs_dir2_node.h

   1 /*
   2  * Copyright (c) 2000,2005 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_NODE_H__
  19 #define __XFS_DIR2_NODE_H__
  20
  21 /*
  22  * Directory version 2, btree node format structures
  23  */
  24
  25 struct uio;
  26 struct xfs_dabuf;
  27 struct xfs_da_args;
  28 struct xfs_da_state;
  29 struct xfs_da_state_blk;
  30 struct xfs_inode;
  31 struct xfs_trans;
  32
  33 /*
  34  * Offset of the freespace index.
  35  */
  36 #define XFS_DIR2_FREE_SPACE     2
  37 #define XFS_DIR2_FREE_OFFSET    (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
  38 #define XFS_DIR2_FREE_FIRSTDB(mp)       \
  39         xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET)
  40
  41 #define XFS_DIR2_FREE_MAGIC     0x58443246      /* XD2F */
  42
  43 typedef struct xfs_dir2_free_hdr {
  44         __be32                  magic;          /* XFS_DIR2_FREE_MAGIC */
  45         __be32                  firstdb;        /* db of first entry */
  46         __be32                  nvalid;         /* count of valid entries */
  47         __be32                  nused;          /* count of used entries */
  48 } xfs_dir2_free_hdr_t;
  49
  50 typedef struct xfs_dir2_free {
  51         xfs_dir2_free_hdr_t     hdr;            /* block header */
  52         __be16                  bests[1];       /* best free counts */
  53                                                 /* unused entries are -1 */
  54 } xfs_dir2_free_t;
  55
  56 #define XFS_DIR2_MAX_FREE_BESTS(mp)     \
  57         (((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \
  58          (uint)sizeof(xfs_dir2_data_off_t))
  59
  60 /*
  61  * Convert data space db to the corresponding free db.
  62  */
  63 static inline xfs_dir2_db_t
  64 xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db)
  65 {
  66         return (XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp));
  67 }
  68
  69 /*
  70  * Convert data space db to the corresponding index in a free db.
  71  */
  72 static inline int
  73 xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
  74 {
  75         return ((db) % XFS_DIR2_MAX_FREE_BESTS(mp));
  76 }
  77
  78 extern int xfs_dir2_leaf_to_node(struct xfs_da_args *args,
  79                                  struct xfs_dabuf *lbp);
  80 extern xfs_dahash_t xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count);
  81 extern int xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp,
  82                                      struct xfs_da_args *args, int *indexp,
  83                                      struct xfs_da_state *state);
  84 extern int xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp,
  85                                 struct xfs_dabuf *leaf2_bp);
  86 extern int xfs_dir2_leafn_split(struct xfs_da_state *state,
  87                                 struct xfs_da_state_blk *oldblk,
  88                                 struct xfs_da_state_blk *newblk);
  89 extern int xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action);
  90 extern void xfs_dir2_leafn_unbalance(struct xfs_da_state *state,
  91                                      struct xfs_da_state_blk *drop_blk,
  92                                      struct xfs_da_state_blk *save_blk);
  93 extern int xfs_dir2_node_addname(struct xfs_da_args *args);
  94 extern int xfs_dir2_node_lookup(struct xfs_da_args *args);
  95 extern int xfs_dir2_node_removename(struct xfs_da_args *args);
  96 extern int xfs_dir2_node_replace(struct xfs_da_args *args);
  97 extern int xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo,
  98                                    int *rvalp);
  99
 100 #endif  /* __XFS_DIR2_NODE_H__ */