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 xfs_bmap_free;
  22 struct xfs_da_args;
  23 struct xfs_inode;
  24 struct xfs_mount;
  25 struct xfs_trans;
  26 struct xfs_dir2_sf_hdr;
  27 struct xfs_dir2_sf_entry;
  28 struct xfs_dir2_data_hdr;
  29 struct xfs_dir2_data_entry;
  30 struct xfs_dir2_data_unused;
  31
  32 extern struct xfs_name  xfs_name_dotdot;
  33
  34 /*
  35  * directory operations vector for encode/decode routines
  36  */
  37 struct xfs_dir_ops {
  38         int     (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
  39         struct xfs_dir2_sf_entry *
  40                 (*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
  41                                 struct xfs_dir2_sf_entry *sfep);
  42         __uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
  43         void    (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
  44                                 __uint8_t ftype);
  45         xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
  46                                 struct xfs_dir2_sf_entry *sfep);
  47         void    (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
  48                               struct xfs_dir2_sf_entry *sfep,
  49                               xfs_ino_t ino);
  50         xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
  51         void    (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
  52                                      xfs_ino_t ino);
  53
  54         int     (*data_entsize)(int len);
  55         __uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
  56         void    (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
  57                                 __uint8_t ftype);
  58         __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
  59         struct xfs_dir2_data_free *
  60                 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
  61
  62         xfs_dir2_data_aoff_t data_dot_offset;
  63         xfs_dir2_data_aoff_t data_dotdot_offset;
  64         xfs_dir2_data_aoff_t data_first_offset;
  65         size_t  data_entry_offset;
  66
  67         struct xfs_dir2_data_entry *
  68                 (*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  69         struct xfs_dir2_data_entry *
  70                 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  71         struct xfs_dir2_data_entry *
  72                 (*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
  73         struct xfs_dir2_data_entry *
  74                 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
  75         struct xfs_dir2_data_unused *
  76                 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
  77
  78         int     leaf_hdr_size;
  79         void    (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
  80                                     struct xfs_dir3_icleaf_hdr *from);
  81         void    (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
  82                                       struct xfs_dir2_leaf *from);
  83         int     (*leaf_max_ents)(struct xfs_da_geometry *geo);
  84         struct xfs_dir2_leaf_entry *
  85                 (*leaf_ents_p)(struct xfs_dir2_leaf *lp);
  86
  87         int     node_hdr_size;
  88         void    (*node_hdr_to_disk)(struct xfs_da_intnode *to,
  89                                     struct xfs_da3_icnode_hdr *from);
  90         void    (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
  91                                       struct xfs_da_intnode *from);
  92         struct xfs_da_node_entry *
  93                 (*node_tree_p)(struct xfs_da_intnode *dap);
  94
  95         int     free_hdr_size;
  96         void    (*free_hdr_to_disk)(struct xfs_dir2_free *to,
  97                                     struct xfs_dir3_icfree_hdr *from);
  98         void    (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
  99                                       struct xfs_dir2_free *from);
 100         int     (*free_max_bests)(struct xfs_da_geometry *geo);
 101         __be16 * (*free_bests_p)(struct xfs_dir2_free *free);
 102         xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
 103                                    xfs_dir2_db_t db);
 104         int     (*db_to_fdindex)(struct xfs_da_geometry *geo,
 105                                  xfs_dir2_db_t db);
 106 };
 107
 108 extern const struct xfs_dir_ops *
 109         xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
 110 extern const struct xfs_dir_ops *
 111         xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
 112
 113 /*
 114  * Generic directory interface routines
 115  */
 116 extern void xfs_dir_startup(void);
 117 extern int xfs_da_mount(struct xfs_mount *mp);
 118 extern void xfs_da_unmount(struct xfs_mount *mp);
 119
 120 extern int xfs_dir_isempty(struct xfs_inode *dp);
 121 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
 122                                 struct xfs_inode *pdp);
 123 extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
 124                                 struct xfs_name *name, xfs_ino_t inum,
 125                                 xfs_fsblock_t *first,
 126                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
 127 extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
 128                                 struct xfs_name *name, xfs_ino_t *inum,
 129                                 struct xfs_name *ci_name);
 130 extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
 131                                 struct xfs_name *name, xfs_ino_t ino,
 132                                 xfs_fsblock_t *first,
 133                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
 134 extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
 135                                 struct xfs_name *name, xfs_ino_t inum,
 136                                 xfs_fsblock_t *first,
 137                                 struct xfs_bmap_free *flist, xfs_extlen_t tot);
 138 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
 139                                 struct xfs_name *name, uint resblks);
 140
 141 /*
 142  * Direct call from the bmap code, bypassing the generic directory layer.
 143  */
 144 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
 145
 146 /*
 147  * Interface routines used by userspace utilities
 148  */
 149 extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
 150 extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
 151 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
 152                                 struct xfs_buf *bp);
 153
 154 extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
 155                 struct xfs_dir2_data_hdr *hdr, int *loghead);
 156 extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
 157                 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
 158 extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
 159                 struct xfs_buf *bp);
 160 extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
 161                 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
 162 extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
 163                 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
 164                 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
 165 extern void xfs_dir2_data_use_free(struct xfs_da_args *args,
 166                 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
 167                 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
 168                 int *needlogp, int *needscanp);
 169
 170 extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
 171                 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
 172                 struct xfs_dir2_data_unused *dup);
 173
 174 extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
 175 extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
 176 extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
 177 extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
 178 extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
 179
 180 #endif  /* __XFS_DIR2_H__ */