fs/xfs/xfs_dir2.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_H__
  33 #define __XFS_DIR2_H__
  34
  35 struct uio;
  36 struct xfs_dabuf;
  37 struct xfs_da_args;
  38 struct xfs_dir2_put_args;
  39 struct xfs_inode;
  40 struct xfs_trans;
  41
  42 /*
  43  * Directory version 2.
  44  * There are 4 possible formats:
  45  *      shortform
  46  *      single block - data with embedded leaf at the end
  47  *      multiple data blocks, single leaf+freeindex block
  48  *      data blocks, node&leaf blocks (btree), freeindex blocks
  49  *
  50  *      The shortform format is in xfs_dir2_sf.h.
  51  *      The single block format is in xfs_dir2_block.h.
  52  *      The data block format is in xfs_dir2_data.h.
  53  *      The leaf and freeindex block formats are in xfs_dir2_leaf.h.
  54  *      Node blocks are the same as the other version, in xfs_da_btree.h.
  55  */
  56
  57 /*
  58  * Byte offset in data block and shortform entry.
  59  */
  60 typedef __uint16_t      xfs_dir2_data_off_t;
  61 #define NULLDATAOFF     0xffffU
  62 typedef uint            xfs_dir2_data_aoff_t;   /* argument form */
  63
  64 /*
  65  * Directory block number (logical dirblk in file)
  66  */
  67 typedef __uint32_t      xfs_dir2_db_t;
  68
  69 /*
  70  * Byte offset in a directory.
  71  */
  72 typedef xfs_off_t               xfs_dir2_off_t;
  73
  74 /*
  75  * For getdents, argument struct for put routines.
  76  */
  77 typedef int (*xfs_dir2_put_t)(struct xfs_dir2_put_args *pa);
  78 typedef struct xfs_dir2_put_args {
  79         xfs_off_t               cook;           /* cookie of (next) entry */
  80         xfs_intino_t    ino;            /* inode number */
  81         struct xfs_dirent       *dbp;           /* buffer pointer */
  82         char            *name;          /* directory entry name */
  83         int             namelen;        /* length of name */
  84         int             done;           /* output: set if value was stored */
  85         xfs_dir2_put_t  put;            /* put function ptr (i/o) */
  86         struct uio      *uio;           /* uio control structure */
  87 } xfs_dir2_put_args_t;
  88
  89 #define XFS_DIR_IS_V2(mp)       ((mp)->m_dirversion == 2)
  90 extern xfs_dirops_t     xfsv2_dirops;
  91
  92 /*
  93  * Other interfaces used by the rest of the dir v2 code.
  94  */
  95 extern int
  96         xfs_dir2_grow_inode(struct xfs_da_args *args, int space,
  97                             xfs_dir2_db_t *dbp);
  98
  99 extern int
 100         xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);
 101
 102 extern int
 103         xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);
 104
 105 extern int
 106         xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
 107                               struct xfs_dabuf *bp);
 108
 109 #endif  /* __XFS_DIR2_H__ */