fs/xfs/xfs_dir2_block.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_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
  26 struct uio;
  27 struct xfs_dabuf;
  28 struct xfs_da_args;
  29 struct xfs_dir2_data_hdr;
  30 struct xfs_dir2_leaf_entry;
  31 struct xfs_inode;
  32 struct xfs_mount;
  33 struct 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
  45 typedef 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  */
  53 typedef 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  */
  63 static inline xfs_dir2_block_tail_t *
  64 xfs_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  */
  73 static inline struct xfs_dir2_leaf_entry *
  74 xfs_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  */
  82 extern int xfs_dir2_block_addname(struct xfs_da_args *args);
  83 extern int xfs_dir2_block_getdents(struct xfs_inode *dp, void *dirent,
  84                                    xfs_off_t *offset, filldir_t filldir);
  85 extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
  86 extern int xfs_dir2_block_removename(struct xfs_da_args *args);
  87 extern int xfs_dir2_block_replace(struct xfs_da_args *args);
  88 extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
  89                                   struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
  90 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
  91
  92 #endif  /* __XFS_DIR2_BLOCK_H__ */