LXR linux/fs/xfs/xfs_dir2

   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_BLOCK_H__
  19#define __XFS_DIR2_BLOCK_H__
  20
  21/*
  22 * xfs_dir2_block.h
  23 * Directory version 2, single block format structures
  24 */
  25
  26struct uio;
  27struct xfs_dabuf;
  28struct xfs_da_args;
  29struct xfs_dir2_data_hdr;
  30struct xfs_dir2_leaf_entry;
  31struct xfs_inode;
  32struct xfs_mount;
  33struct xfs_trans;
  34
  35/*
  36 * The single block format is as follows:
  37 * xfs_dir2_data_hdr_t structure
  38 * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
  39 * xfs_dir2_leaf_entry_t structures
  40 * xfs_dir2_block_tail_t structure
  41 */
  42
  43#define XFS_DIR2_BLOCK_MAGIC    0x58443242      /* XD2B: for one block dirs */
  44
  45typedef struct xfs_dir2_block_tail {
  46        __be32          count;                  /* count of leaf entries */
  47        __be32          stale;                  /* count of stale lf entries */
  48} xfs_dir2_block_tail_t;
  49
  50/*
  51 * Generic single-block structure, for xfs_db.
  52 */
  53typedef struct xfs_dir2_block {
  54        xfs_dir2_data_hdr_t     hdr;            /* magic XFS_DIR2_BLOCK_MAGIC */
  55        xfs_dir2_data_union_t   u[1];
  56        xfs_dir2_leaf_entry_t   leaf[1];
  57        xfs_dir2_block_tail_t   tail;
  58} xfs_dir2_block_t;
  59
  60/*
  61 * Pointer to the leaf header embedded in a data block (1-block format)
  62 */
  63static inline xfs_dir2_block_tail_t *
  64xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_block_t *block)
  65{
  66        return (((xfs_dir2_block_tail_t *)
  67                ((char *)(block) + (mp)->m_dirblksize)) - 1);
  68}
  69
  70/*
  71 * Pointer to the leaf entries embedded in a data block (1-block format)
  72 */
  73static inline struct xfs_dir2_leaf_entry *
  74xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
  75{
  76        return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);
  77}
  78
  79/*
  80 * Function declarations.
  81 */
  82extern int xfs_dir2_block_addname(struct xfs_da_args *args);
  83extern int xfs_dir2_block_getdents(struct xfs_inode *dp, void *dirent,
  84                                   xfs_off_t *offset, filldir_t filldir);
  85extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
  86extern int xfs_dir2_block_removename(struct xfs_da_args *args);
  87extern int xfs_dir2_block_replace(struct xfs_da_args *args);
  88extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
  89                                  struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
  90extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
  91
  92#endif  /* __XFS_DIR2_BLOCK_H__ */
  93