fs/xfs/xfs_dir2.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_H__
  19 #define __XFS_DIR2_H__
  20
  21 struct uio;
  22 struct xfs_dabuf;
  23 struct xfs_da_args;
  24 struct xfs_dir2_put_args;
  25 struct xfs_inode;
  26 struct xfs_trans;
  27
  28 /*
  29  * Directory version 2.
  30  * There are 4 possible formats:
  31  *      shortform
  32  *      single block - data with embedded leaf at the end
  33  *      multiple data blocks, single leaf+freeindex block
  34  *      data blocks, node&leaf blocks (btree), freeindex blocks
  35  *
  36  *      The shortform format is in xfs_dir2_sf.h.
  37  *      The single block format is in xfs_dir2_block.h.
  38  *      The data block format is in xfs_dir2_data.h.
  39  *      The leaf and freeindex block formats are in xfs_dir2_leaf.h.
  40  *      Node blocks are the same as the other version, in xfs_da_btree.h.
  41  */
  42
  43 /*
  44  * Byte offset in data block and shortform entry.
  45  */
  46 typedef __uint16_t      xfs_dir2_data_off_t;
  47 #define NULLDATAOFF     0xffffU
  48 typedef uint            xfs_dir2_data_aoff_t;   /* argument form */
  49
  50 /*
  51  * Directory block number (logical dirblk in file)
  52  */
  53 typedef __uint32_t      xfs_dir2_db_t;
  54
  55 /*
  56  * Byte offset in a directory.
  57  */
  58 typedef xfs_off_t               xfs_dir2_off_t;
  59
  60 /*
  61  * For getdents, argument struct for put routines.
  62  */
  63 typedef int (*xfs_dir2_put_t)(struct xfs_dir2_put_args *pa);
  64 typedef struct xfs_dir2_put_args {
  65         xfs_off_t               cook;           /* cookie of (next) entry */
  66         xfs_intino_t    ino;            /* inode number */
  67         struct xfs_dirent       *dbp;           /* buffer pointer */
  68         char            *name;          /* directory entry name */
  69         int             namelen;        /* length of name */
  70         int             done;           /* output: set if value was stored */
  71         xfs_dir2_put_t  put;            /* put function ptr (i/o) */
  72         struct uio      *uio;           /* uio control structure */
  73 } xfs_dir2_put_args_t;
  74
  75 #define XFS_DIR_IS_V2(mp)       ((mp)->m_dirversion == 2)
  76 extern xfs_dirops_t     xfsv2_dirops;
  77
  78 /*
  79  * Other interfaces used by the rest of the dir v2 code.
  80  */
  81 extern int
  82         xfs_dir2_grow_inode(struct xfs_da_args *args, int space,
  83                             xfs_dir2_db_t *dbp);
  84
  85 extern int
  86         xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);
  87
  88 extern int
  89         xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);
  90
  91 extern int
  92         xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
  93                               struct xfs_dabuf *bp);
  94
  95 #endif  /* __XFS_DIR2_H__ */