fs/xfs/xfs_dir2_block.h

   1 /*
   2  * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_DIR2_BLOCK_H__
  33 #define __XFS_DIR2_BLOCK_H__
  34
  35 /*
  36  * xfs_dir2_block.h
  37  * Directory version 2, single block format structures
  38  */
  39
  40 struct uio;
  41 struct xfs_dabuf;
  42 struct xfs_da_args;
  43 struct xfs_dir2_data_hdr;
  44 struct xfs_dir2_leaf_entry;
  45 struct xfs_inode;
  46 struct xfs_mount;
  47 struct xfs_trans;
  48
  49 /*
  50  * The single block format is as follows:
  51  * xfs_dir2_data_hdr_t structure
  52  * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
  53  * xfs_dir2_leaf_entry_t structures
  54  * xfs_dir2_block_tail_t structure
  55  */
  56
  57 #define XFS_DIR2_BLOCK_MAGIC    0x58443242      /* XD2B: for one block dirs */
  58
  59 typedef struct xfs_dir2_block_tail {
  60         __uint32_t      count;                  /* count of leaf entries */
  61         __uint32_t      stale;                  /* count of stale lf entries */
  62 } xfs_dir2_block_tail_t;
  63
  64 /*
  65  * Generic single-block structure, for xfs_db.
  66  */
  67 typedef struct xfs_dir2_block {
  68         xfs_dir2_data_hdr_t     hdr;            /* magic XFS_DIR2_BLOCK_MAGIC */
  69         xfs_dir2_data_union_t   u[1];
  70         xfs_dir2_leaf_entry_t   leaf[1];
  71         xfs_dir2_block_tail_t   tail;
  72 } xfs_dir2_block_t;
  73
  74 /*
  75  * Pointer to the leaf header embedded in a data block (1-block format)
  76  */
  77 #define XFS_DIR2_BLOCK_TAIL_P(mp,block) xfs_dir2_block_tail_p(mp,block)
  78 static inline xfs_dir2_block_tail_t *
  79 xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_block_t *block)
  80 {
  81         return (((xfs_dir2_block_tail_t *)
  82                 ((char *)(block) + (mp)->m_dirblksize)) - 1);
  83 }
  84
  85 /*
  86  * Pointer to the leaf entries embedded in a data block (1-block format)
  87  */
  88 #define XFS_DIR2_BLOCK_LEAF_P(btp)      xfs_dir2_block_leaf_p(btp)
  89 static inline struct xfs_dir2_leaf_entry *
  90 xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
  91 {
  92         return (((struct xfs_dir2_leaf_entry *)
  93                 (btp)) - INT_GET((btp)->count, ARCH_CONVERT));
  94 }
  95
  96 /*
  97  * Function declarations.
  98  */
  99 extern int xfs_dir2_block_addname(struct xfs_da_args *args);
 100 extern int xfs_dir2_block_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
 101                                    struct uio *uio, int *eofp,
 102                                    struct xfs_dirent *dbp, xfs_dir2_put_t put);
 103 extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
 104 extern int xfs_dir2_block_removename(struct xfs_da_args *args);
 105 extern int xfs_dir2_block_replace(struct xfs_da_args *args);
 106 extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
 107                                   struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
 108 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
 109
 110 #endif  /* __XFS_DIR2_BLOCK_H__ */