release/src-rt-6.x/linux/linux-2.6/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_bmap_free;
  26 struct xfs_inode;
  27 struct xfs_mount;
  28 struct xfs_trans;
  29
  30 /*
  31  * Directory version 2.
  32  * There are 4 possible formats:
  33  *      shortform
  34  *      single block - data with embedded leaf at the end
  35  *      multiple data blocks, single leaf+freeindex block
  36  *      data blocks, node&leaf blocks (btree), freeindex blocks
  37  *
  38  *      The shortform format is in xfs_dir2_sf.h.
  39  *      The single block format is in xfs_dir2_block.h.
  40  *      The data block format is in xfs_dir2_data.h.
  41  *      The leaf and freeindex block formats are in xfs_dir2_leaf.h.
  42  *      Node blocks are the same as the other version, in xfs_da_btree.h.
  43  */
  44
  45 /*
  46  * Byte offset in data block and shortform entry.
  47  */
  48 typedef __uint16_t      xfs_dir2_data_off_t;
  49 #define NULLDATAOFF     0xffffU
  50 typedef uint            xfs_dir2_data_aoff_t;   /* argument form */
  51
  52 /*
  53  * Directory block number (logical dirblk in file)
  54  */
  55 typedef __uint32_t      xfs_dir2_db_t;
  56
  57 /*
  58  * Byte offset in a directory.
  59  */
  60 typedef xfs_off_t       xfs_dir2_off_t;
  61
  62 /*
  63  * For getdents, argument struct for put routines.
  64  */
  65 typedef int (*xfs_dir2_put_t)(struct xfs_dir2_put_args *pa);
  66 typedef struct xfs_dir2_put_args {
  67         xfs_off_t       cook;           /* cookie of (next) entry */
  68         xfs_intino_t    ino;            /* inode number */
  69         xfs_dirent_t    *dbp;           /* buffer pointer */
  70         char            *name;          /* directory entry name */
  71         int             namelen;        /* length of name */
  72         int             done;           /* output: set if value was stored */
  73         xfs_dir2_put_t  put;            /* put function ptr (i/o) */
  74         struct uio      *uio;           /* uio control structure */
  75 } xfs_dir2_put_args_t;
  76
  77 /*
  78  * Generic directory interface routines
  79  */
  80 extern void xfs_dir_startup(void);
  81 extern void xfs_dir_mount(struct xfs_mount *mp);
  82 extern int xfs_dir_isempty(struct xfs_inode *dp);
  83 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
  84                                 struct xfs_inode *pdp);
  85 extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
  86                                 char *name, int namelen, xfs_ino_t inum,
  87                                 xfs_fsblock_t *first,
  88                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
  89 extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
  90                                 char *name, int namelen, xfs_ino_t *inum);
  91 extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
  92                                 char *name, int namelen, xfs_ino_t ino,
  93                                 xfs_fsblock_t *first,
  94                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
  95 extern int xfs_dir_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
  96                                 uio_t *uio, int *eofp);
  97 extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
  98                                 char *name, int namelen, xfs_ino_t inum,
  99                                 xfs_fsblock_t *first,
 100                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
 101 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
 102                                 char *name, int namelen);
 103 extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
 104
 105 /*
 106  * Utility routines for v2 directories.
 107  */
 108 extern int xfs_dir2_grow_inode(struct xfs_da_args *args, int space,
 109                                 xfs_dir2_db_t *dbp);
 110 extern int xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp,
 111                                 int *vp);
 112 extern int xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp,
 113                                 int *vp);
 114 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
 115                                 struct xfs_dabuf *bp);
 116
 117 #endif  /* __XFS_DIR2_H__ */